Some standard content:
National Standard of the People's Republic of China
Hydraulic excavators-Testing method of structure strength
1 Subject content and applicable model drawings
This standard specifies the structural strength test method of hydraulic excavators with a total mass of 3.2 to 80 tons. This standard is applicable to the testing of new hydraulic excavators and old products with significant structural improvements. 2 General provisions
2.1 Prototype requirements
GB 9141-88
Before the test, the prototype should be excavated under the condition that the diesel engine, air pressure system and hydraulic system work normally, and the time is not less than 1 hour.
2. 2 Data preparation
2.2.1 General drawing of test structure and key parts drawing. 2.2.2 Structural analysis report or calculation book.
2.2.3 Material mechanical property measurement report. The measurement items include strength limit B, yield limit os and Poisson coefficient μ, etc. 2.3 Instrument requirements
2.3.1 The instrument is within the validity period of the calibration.
2.3.2 The sensor should be calibrated before the test, and the technical performance should meet the requirements of the instruction manual. 2.4 Personnel requirements
The personnel responsible for the test should be specially trained and competent for structural analysis and stress measurement. 2.5 Measurement accuracy
Static measurement accuracy: stress, hydraulic cylinder pressure, hydraulic cylinder displacement, all are ±2%; dynamic measurement accuracy: stress, filter pressure cylinder pressure, filter pressure cylinder displacement, all are ±5%.
3 Static stress test
3. 1 Test items
3.1. 1 Stress test of working device.
3.1.2 Deadweight stress test of turntable, base, track frame, frame, bridge housing and outrigger. 3.2 Test conditions
The test conditions of each component shall be determined through detailed load and structural analysis, or according to the test positions and loads specified in Appendix A (Supplement). 3.3 Test preparation
3.3.1 Principles for selecting measuring points
The measuring points shall be arranged in the dangerous area or in the parts with special requirements. The dangerous area can be determined based on the structural analysis data, and should usually include: uniform high stress area, stress concentration area (near holes, eyes, sharp corners and welds) and damaged areas during use. Approved by the Ministry of Urban and Rural Environmental Protection of the People's Republic of China on April 15, 1988, and implemented on October 1, 1988
3.3.2 Test Locations
3.3.2.1 Working support
GB 9141—88
Bucket; the middle of the front wall of the bucket, the corner of the ten lips; Post
Tie rod, middle:
Body: middle (where the medium force acts); d.
Bucket rod: front and rear parts of the medium force acting (patches along the four corners of the edge); stress concentration parts near the support; Boom: front and rear parts of the concentrated force acting (patches along the four corners of the edge); stress concentration parts near the support. e.
3.3.2.2 Turntable: on the upper and lower covers at the intersection of the main beam and the turntable support ring; the lower support of the boom and the lower support of the boom hydraulic cylinder. 3.3.2.3 Base: near the support point.
3.3.2.4 Track frame: root of fork structure; supporting crossbeam; longitudinal middle part. 3.3.2.5 Frame: near the intersection of roller and longitudinal beam, where the single beam section changes suddenly. 3.3.2.6 Leg: upper and lower surface of the root.
3.3.2.7 Bridge, front axle bogie; front and rear parts of the bridge shell where concentrated force acts. 3.3.3 Connection of patch and bridge
3.3.3.1 Paste the strain gauge accurately and firmly. Before pasting, draw lines on the structural parts to accurately determine the position of the measuring point. After pasting, number the measuring points, record their position and size, and draw a patch diagram. 3.3.3.2 After pasting, the strain gauge should be treated with moisture-proof treatment, and it is required to be tested when its insulation resistance is higher than 100MQ. 3.3.3.3 Connect the measurement system. Carefully ensure that the wiring of the measuring piece and the compensation piece is correct, and check the balance and zero drift. 3.4 Test method
3.4.1 Self-weight stress test
For structures that need to measure the self-weight stress, such as turntables, bases, crawler frames, frames and bridges, the zero stress state should be established first. The strain gauge should be zeroed in the unassembled state1 or the structure should be zeroed (such as for the bridge shell and crawler frame, etc.). Then measure the self-weight stress according to Table A3, and record the measurement results in Appendix B (reference) Table B1. 3.4.2 Working device static stress test
3.4.2.1 Fix the working device according to the test position. Stop the prototype on the cement floor (if the machine to be tested is a backhoe excavator, there must be a foundation pit and loading facilities under its working device), replace the boom, dipper rod and bucket hydraulic cylinder with an adjustable pull rod according to the working conditions, and fix the working device in the test position (it can also be achieved by adding a sleeve between the cylinder body and the piston head). If it is a tire hydraulic excavator, the prototype should be lifted up by the outriggers before the test so that the tires are not loaded.
3.4.2.2 Loading. According to the predetermined test conditions, load in 5 levels from zero to maximum load. In order to keep the load stable, a high-pressure small-flow pump, a hydraulic cylinder or a manual hoist should be used for loading. The load is monitored by a sensor, a strain gauge measurement system. 3.4.2.3 Measurement and recording. When the load stabilizes at the predetermined value, read the load point by point and record the load value and microstrain number in Table B1. After completing the measurement point recording, remove the load and re-zero. Repeat three times for each load. If the repeatability error or zero drift is greater than 0.02dg/E (E is the elastic modulus) under the maximum load, the cause should be found to reduce the error and zero drift. 3.4.2.4 Bench test. It is allowed to remove the working device and install it on the test bench for static stress testing. At this time, the whole working device can be rotated to an angle for the convenience of loading, but the relative position between the bucket, the dipper rod and the boom cannot be changed, and the stress state cannot be changed. The test method shall be in accordance with the provisions of 3.4.2.1~3.4.2.3. 4 Dynamic stress test
4.1 Test conditions
4.1.1 Test site
4.1.1.1 Excavation material: backhoe excavator is Class 1 soil; front shovel excavator is Class IV soil. The material spread height of the front shovel operation should be greater than half of the maximum excavation height of the prototype.
4.1.1.2 Obstacle crossing and turning road surface
..comCB 9141--88
Tire hydraulic excavator obstacle crossing test road surface: hard and flat road surface, the length is not less than 60m (20m for the pre-test section in the forward and reverse directions, and 20m for the measurement section). The obstacles are set up in the measuring section according to the wheelbase of the prototype, and the distance is equal to the wheelbase. The obstacles are square wood, and the height is in accordance with the provisions of Table A4.
b. Road surface for obstacle crossing test of crawler hydraulic excavator: two cross obstacles are set up according to the track gauge on a hard and flat road surface, and the distance between them is greater than the ground contact length of the membrane belt, and the height is in accordance with the provisions of Table A4.
4.1.2 The test prototype shall comply with the provisions of 2.1. 4.1.3 Test instruments and sensors: dynamic resistance strain gauge, optical oscilloscope or tape recorder; hydraulic sensor and displacement sensor, etc. 4.2 Measured components and measurement parameters
4.2.1 The measured components include working device (boom and bucket rod), turntable and frame, etc. 4.2.2 The measurement parameters are mainly the stress of components such as working device. When measuring the stress of the working device, the pressure and displacement of the hydraulic cylinders of the boom, dipper rod and bucket should be measured. The stress measurement points can be arranged on one side of the symmetrical structure, and the number is determined according to the results of the static stress test. 4.3 Test method
4.3.1 Grouping of test components: Grouping according to the differences and similarities of the test conditions of each component. a. Dynamic stress test of the working device and turntable. b: Dynamic stress test of the frame (for the hydraulic excavator with a belt, it should include the crawler frame; for the hydraulic excavator with a tire, it should include the bridge housing and the outrigger).
4.3.2 Wiring of instruments: When several sets of instruments are used in one test, the measurement system should be composed according to the requirements of synchronous recording. 4.3.3 Zeroing and calibration of instruments
4.3.3.1 When the dynamic stress test of the working device is carried out, the bucket is placed on the ground close to the frame, and the pressure of each hydraulic cylinder returns to zero to perform zeroing and calibration of the instrument.
4.3.3.2 During the dynamic stress test of the turntable and other components, the test position shall be zeroed and calibrated according to the test condition code JS-12 for the self-weight stress measurement. 4.3.4 Test, according to 4.5. The test is carried out under the working conditions specified in the test. The front shovel excavator should produce the working conditions equivalent to the working conditions coded as JS-05 to JS-07 in the static stress test; the backhoe excavator should produce the working conditions equivalent to the working conditions coded as JS-01 to JS-04 in the static stress test. The extreme load state should appear, that is, the hydraulic system overflows or the prototype is unstable. Record the entire working cycle of excavation, lifting rotation, unloading and no-load return. After the test, the prototype returns to the zeroing position, and the instrument is zeroed and calibrated again. The test includes at least three valid values. 4.4 Test conditions
The dynamic stress test conditions of components such as working devices, turntables and frames are in accordance with the provisions of Table A4. 4.5 Test results
The maximum peak-to-valley stress value effectively recorded in each working condition is obtained from the stress curve, and this value is superimposed with the deadweight stress to obtain the synthetic stress. The position and load where the maximum stress appears in the boom and dipper arm of each working condition are determined by the hydraulic cylinder pressure and displacement curve. When processing manually, record the test data in Table B2. When processing by computer, print out similar results. 5 Stress, safety factor calculation and test report 5.1 Principal stress gauge
5.1.1 Uniaxial stress state
Uniaxial principal stress is calculated according to formula (1).
Where: —— principal stress, MPa;
3—— average value of three measurements of strain gauge, eE elastic modulus, MPa.
5.1.2 Plane stress state
..com (1)
5.1.2.1 Principal stress direction is known
GB 9141—88
The maximum and minimum stresses are calculated according to formulas (2) and (3) based on the principal strains measured along the two principal stress directions. E
Where: oj,d, the maximum and minimum principal stress, MPa; E+,
E1,E: — the average value of three measurements of each single piece,; Poisson's ratio coefficient.
5. 1.2.2 The direction of principal stress is unknown
8. Three rectangular strain rosettes
o_Efe+e+
b. Three equiangular strain rosettes
(,—e)*+{262—(t1+$,)
[3(1-以)
E,+e+$
Where: 1,2, — the average value of three measurements of each of the three single pieces of the strain rosette, re. 5.2 Equivalent stress calculation
Combined with the static and dynamic stress test results, the larger one is taken and the equivalent stress is calculated according to formula (6). =Va-a+
5.3 Safety factor
Where; ds—the service limit of the material, MPa. 5.4 Test report
The test report should include the following contents:
2. Overview:
b. Test conditions;
Test method;
d. Test results (stress data and safety factor of each component);
Analysis opinions and conclusions.
（4）
·（5)
Backhoe
Bucket tilting
Excavator bucket
Lever test
Backhoe
Bucket straightening
Excavator bucket
Support, moving compensation
Tester
Backhoe
Bucket straightening
Lever, boom
Tester
Backhoe
Bucket tilting
Excavator bucket
GB 9141—88
Appendix A
Static stress test working condition table
(supplement)
Table A1 Static stress test working condition table for backhoe working device Test position
The hydraulic cylinder of the boom is fully hydraulic
The hydraulic cylinder has the largest force, and the tip of the bucket tooth is located on the extension line of the connecting line of the bucket and boom and the connecting line of the boom and boom hinge, that is, point is located on the extension line of BC. (See Figure
The hydraulic cylinder of the boom and boom has the largest force. Point G is at BC On the extension line of (see Figure A2) the boom and dipper rod wave pressure cylinder have the largest force arm, and the bucket hydraulic cylinder works with the maximum equivalent force (see Figure A2). The boom hydraulic cylinder is fully retracted, and the three points G, B, and C are located on the plumb line (see Figure A2). The direction is large, perpendicular to the BC line). Tangential force W (perpendicular to the excavation plane) Tangential force Wi (perpendicular to the CG line) Same as JS-02 Same as JS-01 ||By bucket
Reducing cylinder
Loading point
Thrust is confirmed
Gear
By the same rotation
Mechanism
Torque
By bucket
Hydraulic cylinder
Thrust is confirmed
Same as JS-02
Same as JS-01
Side teeth
Middle teeth
Same as JS-02
Same as JS-01
Tested components
Backhoe working device (bucket
Bucket, connecting rod, rocker, movable
Same as JS-01
Same as J3-01
JS-01
Positive shovel
Bucket eccentricity
Excavation bucket
Support arm
Tester
Positive shovel
Support eccentricity
Excavation bucket
Rod dynamic
Tester
Positive shovel
Rod eccentricity
Excavation bucket
Rod test
Positive shovel
Rod eccentricity
Horizontal excavation
Photography, dynamic
arm, bucket rod
Tester
GB 914188
Table A2 Static stress test condition table of front shovel working device Test position
Action of boom and arm hydraulic cylinder
Maximum force arm + bucket hydraulic cylinder works with
maximum equivalent force arm See Figure
Action of boom and arm hydraulic cylinder
Maximum force kidney, CG line is in horizontal position (see Figure A4)
Action of boom hydraulic cylinder is maximum, arm hydraulic cylinder is fully retracted, bucket hydraulic cylinder is fully extended
(see Figure A5)
Arm hydraulic cylinder is fully retracted, bucket tip is on the ground, bucket cutting angle is 30° (see
1 in Figure A6) Position)
Shear force
Wi (vertical
to CG line)
Lateral force
w (vertical
to excavation
plane)
Tangential force
(vertical
to BG line)
Lateral force
Wa (vertical
to excavation
plane)
Same as JS-06
Built by the bucket
Pressed by the cylinder
Thrust
By the rotation|| Add interception point
Side teeth
Tested components
Front shovel working device (bucket, link, rocker, bucket, boom)
Machine tree controls
Dynamic torque
The thrust is controlled by the bucket
Hydraulic insert
Controlled by the rotary
mechanismDynamic square torque
JS-06
Same as JS-05
Side teeth
Same as JS-05
JS-06
With horizontal excavation function
Same as JS-06
Same as JS-06 Same as JS-06
Face shovel working device (shovel
bucket, connecting rod, pull rod, bucket
rod. Boom)
Face shovel bucket
rod eccentric load
Horizontal excavation
rod, boom
Tester
Face shovel bucket
rod positive load
Horizontal excavation
rod.Boom
Tester
Positive bucket
Rod positive load
Horizontal digging
Rod, boom
Tester
Self-weight stress test
GB 9141—88
Continued Table A2
Test position
The bucket support hydraulic cylinder is in the middle position
oxygen, the bucket tip is on the ground, and the bucket cutting angle is 30° (see Figure A6, position 1
Same as JS-09
The bucket arm hydraulic cylinder is fully extended, the bucket tip is on the ground, and the bucket cutting angle is 30° (see Figure
||A6 middle [position)
same as JS-06
tangential force
W, (perpendicular to BG line)
same as JS-10
same as JS-06
thrust of hydraulic cylinder outside the shovel is confirmed by
JS-10
Table A3 self-weight stress test working condition table
Test position
The upper cover plate of the boom is horizontal, the sensitive point of the boom and the bucket rod is in a vertical direction with the connecting line of the bucket tooth tip, the shovel is 10cm above the ground
add cutting point
load JS-06
same as JS-10
direction "size
|Loading point
Test component
Same as JS-08
Commercial JS08
Same as JS-08
Test component
Turret, frame, bridge and outrigger of tire excavator, turntable, underframe and belt frame of crawler excavator
Figure A1JS-01 working condition test position
Figure A3JS-04 working condition test position
Figure A5JS-07 working condition test position
GB 9141—88
Working condition test position
Working condition test position
Figure A6 JS-08.JS-09.JS-10 and JS-11 Working condition test position number
Working condition name
Any digging and inserting symmetrical loading condition
Any digging and picking eccentric loading condition
Arm digging and bundling symmetrical loading condition
Arm digging and donating eccentric loading condition
Bucket digging and bundling symmetrical loading condition
Bucket digging and inserting eccentric cutting condition
Quick rise and stop condition
Descending stop condition| |tt||Slewing brake working condition
Descending impact working condition
Yongping excavation symmetrical load working condition
Horizontal excavation load working condition
Longitudinal forward tilt working condition
Transverse forward tilt working condition
Oblique forward tilt working condition
Periodic backward braking working condition
Transverse backward tilt working condition
Turning driving working condition
GB 9141--88
Table A4 Dynamic stress test condition table
Chaos. The digging capacity should be fully utilized.
b. Symmetrical load working condition means that the bucket cuts materials symmetrically; eccentric load working condition means that the bucket cuts materials with the cutting edge of the left and right sides not exceeding 1/4 of the bucket width (the same below). The digging capacity should be fully utilized.
The digging capacity should be fully utilized.
b. Before the bucket rises rapidly from the lowest position to the highest position, the oil circuit is cut off to stop the lifting.
e. Before the bucket falls rapidly from the highest position to the lowest position (which can be the ground), the oil circuit is cut off to stop the falling.
a. The bucket is filled with materials or the rated weight is set.
b. The working device is almost fully extended;
c. Rotate 90° to the left at the fastest speed, brake suddenly, and then rotate 90° to the right and brake suddenly
The backhoe working device is fully extended; the bucket and the boom are hydraulically locked, and the boom hydraulic cylinder works: the empty bucket drops from the highest position to impact the ground, and the ground hardness is not less than grade soil
It is only applicable to belt-type front shovel excavators with horizontal excavation function. The bucket teeth (edges) are grounded, and the bucket cutting front angle is 30°; the bucket and the boom are hydraulically locked, and the boom hydraulic cylinder performs horizontal cutting operations from the fully retracted position to the fully extended state. a. The rear wheel (or the rear part of the crawler) leaving the ground or the tendency to leave the ground caused by the digging operation is called forward tilt
b. The working direction is parallel to the driving direction as the longitudinal direction, and the vertical point is the transverse direction (the same below); c. The oblique direction is only applicable to tire excavators, and the working device is above the outriggers (the same below). The bucket pushes the ground, causing the front wheel or front crawler to leave the ground, which is called backward tilt. a. It is only applicable to belt excavators. b. The turning test site should meet the requirements of the driving road conditions. C. The left extension belt brake, the right belt drive or the right waist belt brake, the left crawler drive is a left turn or a right turn, each half a circle.
Test component
Working device
and turntable
Vehicle Frame, bridge
shell, support
and crawler
·Serial number
Name of working condition
Straight driving obstacle overcoming condition
Prototype model:
Test date:
Test position: Bucket hydraulic pressure length
Arm hydraulic cylinder length
Boom hydraulic cylinder length
Strain gauge
First time
Initial reading of sensitive resistance
GB 9141-88
Continued Table A4
a. The driving road surface and construction method should comply with the provisions of 3.1.1.2 b. The obstacle overcoming height of the tire excavator is 0.5 times the minimum ground clearance: The measurement parameters include average speed!
c. The obstacle clearance height of the belt-type excavator is 150mm Appendix B
Test tables
(reference)
Table B1 Structural static stress table
Production number:
Test location:
Final reading
Coefficient n
Measured value
Test load:
Second time
Initial reading Final reading
Test instrument:
Sensitivity coefficient:
Tangential force
Lateral force
Third time
Final reading
Initial reading
Excitation value
Tested component
Frame, bridge||t t||Research, outriggers
and tracks
variable strain
stress preparation
average value correction
MPaNote
Prototype model:
Recorder model:
Test conditions:
Measuring point number
Component name
Additional instructions:
Self-weight strain
GE9141—88
Table B2 Structural dynamic stress table
Factory number:
Test date:
Soil level:
Dynamic strain
Calibration coefficient
This standard is under the jurisdiction of Beijing Institute of Construction Machinery, Ministry of Urban and Rural Construction and Environmental Protection. This standard was drafted by Tianjin Engineering Machinery Research Institute of the State Machinery Industry Commission. Strain gauge model:
Test location:
Synthetic strain
Strain value
This standard is entrusted to Dajin Engineering Machinery Research Institute of the State Machinery Industry Commission for interpretation. μa
Synthetic stressCrawler excavator
Turntable, underframe and belt frame
Figure A1JS-01 working test position
Figure A3JS-04 working test position
Figure A5JS-07 working test position
GB 9141—88
Working test position
Working test position
Figure A6JS-08.JS-09.JS-10 and JS-11 Working condition test position number
Working condition name
Any digging and inserting symmetrical loading condition
Any digging and picking eccentric loading condition
Arm digging and bundling symmetrical loading condition
Arm digging and donating eccentric loading condition
Bucket digging and bundling symmetrical loading condition
Bucket digging and inserting eccentric cutting condition
Quick rise and stop condition
Descending stop condition| |tt||Slewing brake working condition
Descending impact working condition
Yongping excavation symmetrical load working condition
Horizontal excavation load working condition
Longitudinal forward tilt working condition
Transverse forward tilt working condition
Oblique forward tilt working condition
Periodic backward braking working condition
Transverse backward tilt working condition
Turning driving working condition
GB 9141--88
Table A4 Dynamic stress test condition table
Chaos. The digging capacity should be fully utilized.
b. Symmetrical load working condition means that the bucket cuts materials symmetrically; eccentric load working condition means that the bucket cuts materials with the cutting edge of the left and right sides not exceeding 1/4 of the bucket width (the same below). The digging capacity should be fully utilized.
The digging capacity should be fully utilized.
b. Before the bucket rises rapidly from the lowest position to the highest position, the oil circuit is cut off to stop the lifting.
e. Before the bucket falls rapidly from the highest position to the lowest position (which can be the ground), the oil circuit is cut off to stop the falling.
a. The bucket is filled with materials or the rated weight is set.
b. The working device is almost fully extended;
c. Rotate 90° to the left at the fastest speed, brake suddenly, and then rotate 90° to the right and brake suddenly
The backhoe working device is fully extended; the bucket and the boom are hydraulically locked, and the boom hydraulic cylinder works: the empty bucket drops from the highest position to impact the ground, and the ground hardness is not less than grade soil
It is only applicable to belt-type front shovel excavators with horizontal excavation function. The bucket teeth (edges) are grounded, and the bucket cutting front angle is 30°; the bucket and the boom are hydraulically locked, and the boom hydraulic cylinder performs horizontal cutting operations from the fully retracted position to the fully extended state. a. The rear wheel (or the rear part of the crawler) leaving the ground or the tendency to leave the ground caused by the digging operation is called forward tilt
b. The working direction is parallel to the driving direction as the longitudinal direction, and the vertical point is the transverse direction (the same below); c. The oblique direction is only applicable to tire excavators, and the working device is above the outriggers (the same below). The bucket pushes the ground, causing the front wheel or front crawler to leave the ground, which is called backward tilt. a. It is only applicable to belt excavators. b. The turning test site should meet the requirements of the driving road conditions. C. The left extension belt brake, the right belt drive or the right waist belt brake, the left crawler drive is a left turn or a right turn, each half a circle.
Test component
Working device
and turntable
Vehicle Frame, bridge
shell, support
and crawler
·Serial number
Name of working condition
Straight driving obstacle overcoming condition
Prototype model:
Test date:
Test position: Bucket hydraulic pressure length
Arm hydraulic cylinder length
Boom hydraulic cylinder length
Strain gauge
First time
Initial reading of sensitive resistance
GB 9141-88
Continued Table A4
a. The driving road surface and construction method should comply with the provisions of 3.1.1.2 b. The obstacle overcoming height of the tire excavator is 0.5 times the minimum ground clearance: The measurement parameters include average speed!
c. The obstacle clearance height of the belt-type excavator is 150mm Appendix B
Test tables
(reference)
Table B1 Structural static stress table
Production number:
Test location:
Final reading
Coefficient n
Measured value
Test load:
Second time
Initial reading Final reading
Test instrument:
Sensitivity coefficient:
Tangential force
Lateral force
Third time
Final reading
Initial reading
Excitation value
Tested component
Frame, bridge||t t||Research, outriggers
and tracks
variable strain
stress preparation
average value correction
MPaNote
Prototype model:
Recorder model:
Test conditions:
Measuring point number
Component name
Additional instructions:
Self-weight strain
GE9141—88
Table B2 Structural dynamic stress table
Factory number:
Test date:
Soil level:
Dynamic strain
Calibration coefficient
This standard is under the jurisdiction of Beijing Institute of Construction Machinery, Ministry of Urban and Rural Construction and Environmental Protection. This standard was drafted by Tianjin Engineering Machinery Research Institute of the State Machinery Industry Commission. Strain gauge model:
Test location:
Synthetic strain
Strain value
This standard is entrusted to Dajin Engineering Machinery Research Institute of the State Machinery Industry Commission for interpretation. μa
Synthetic stressCrawler excavator
Turntable, underframe and belt frame
Figure A1JS-01 working test position
Figure A3JS-04 working test position
Figure A5JS-07 working test position
GB 9141—88
Working test position
Working test position
Figure A6JS-08.JS-09.JS-10 and JS-11 Working condition test position number
Working condition name
Any digging and inserting symmetrical loading condition
Any digging and picking eccentric loading condition
Arm digging and bundling symmetrical loading condition
Arm digging and donating eccentric loading condition
Bucket digging and bundling symmetrical loading condition
Bucket digging and inserting eccentric cutting condition
Quick rise and stop condition
Descending stop condition| |tt||Slewing brake working condition
Descending impact working condition
Yongping excavation symmetrical load working condition
Horizontal excavation load working condition
Longitudinal forward tilt working condition
Transverse forward tilt working condition
Oblique forward tilt working condition
Periodic backward braking working condition
Transverse backward tilt working condition
Turning driving working condition
GB 9141--88
Table A4 Dynamic stress test condition table
Chaos. The digging capacity should be fully utilized.
b. Symmetrical load working condition means that the bucket cuts materials symmetrically; eccentric load working condition means that the bucket cuts materials with the cutting edge of the left and right sides not exceeding 1/4 of the bucket width (the same below). The digging capacity should be fully utilized.
The digging capacity should be fully utilized.
b. Before the bucket rises rapidly from the lowest position to the highest position, the oil circuit is cut off to stop the lifting.
e. Before the bucket falls rapidly from the highest position to the lowest position (which can be the ground), the oil circuit is cut off to stop the falling.
a. The bucket is filled with materials or the rated weight is set.
b. The working device is almost fully extended;
c. Rotate 90° to the left at the fastest speed, brake suddenly, and then rotate 90° to the right and brake suddenly
The backhoe working device is fully extended; the bucket and the boom are hydraulically locked, and the boom hydraulic cylinder works: the empty bucket drops from the highest position to impact the ground, and the ground hardness is not less than grade soil
It is only applicable to belt-type front shovel excavators with horizontal excavation function. The bucket teeth (edges) are grounded, and the bucket cutting front angle is 30°; the bucket and the boom are hydraulically locked, and the boom hydraulic cylinder performs horizontal cutting operations from the fully retracted position to the fully extended state. a. The rear wheel (or the rear part of the crawler) leaving the ground or the tendency to leave the ground caused by the digging operation is called forward tilt
b. The working direction is parallel to the driving direction as the longitudinal direction, and the vertical point is the transverse direction (the same below); c. The oblique direction is only applicable to tire excavators, and the working device is above the outriggers (the same below). The bucket pushes the ground, causing the front wheel or front crawler to leave the ground, which is called backward tilt. a. It is only applicable to belt excavators. b. The turning test site should meet the requirements of the driving road conditions. C. The left extension belt brake, the right belt drive or the right waist belt brake, the left crawler drive is a left turn or a right turn, each half a circle.
Test component
Working device
and turntable
Vehicle Frame, bridge
shell, support
and crawler
·Serial number
Name of working condition
Straight driving obstacle overcoming condition
Prototype model:
Test date:
Test position: Bucket hydraulic pressure length
Arm hydraulic cylinder length
Boom hydraulic cylinder length
Strain gauge
First time
Initial reading of sensitive resistance
GB 9141-88
Continued Table A4
a. The driving road surface and construction method should comply with the provisions of 3.1.1.2 b. The obstacle overcoming height of the tire excavator is 0.5 times the minimum ground clearance: The measurement parameters include average speed!
c. The obstacle clearance height of the belt-type excavator is 150mm Appendix B
Test tables
(reference)
Table B1 Structural static stress table
Production number:
Test location:
Final reading
Coefficient n
Measured value
Test load:
Second time
Initial reading Final reading
Test instrument:
Sensitivity coefficient:
Tangential force
Lateral force
Third time
Final reading
Initial reading
Excitation value
Tested component
Frame, bridge||t t||Research, outriggers
and tracks
variable strain
stress preparation
average value correction
MPaNote
Prototype model:
Recorder model:
Test conditions:
Measuring point numberwww.bzxz.net
Component name
Additional instructions:
Self-weight strain
GE9141—88
Table B2 Structural dynamic stress table
Factory number:
Test date:
Soil level:
Dynamic strain
Calibration coefficient
This standard is under the jurisdiction of Beijing Institute of Construction Machinery, Ministry of Urban and Rural Construction and Environmental Protection. This standard was drafted by Tianjin Engineering Machinery Research Institute of the State Machinery Industry Commission. Strain gauge model:
Test location:
Synthetic strain
Strain value
This standard is entrusted to Dajin Engineering Machinery Research Institute of the State Machinery Industry Commission for interpretation. μa
Synthetic stressEach half turn
Tested components
Working device
and turntable
Frame, bridge
Shell, support
and crawler
·Serial number
Name of working condition
Straight driving obstacle overcoming condition
Prototype model:
Test date:
Test position: Bucket hydraulic pressure sign length
Arm hydraulic cylinder length
Boom hydraulic cylinder length
Strain gauge
First time
Initial reading of sensitive resistance
GB 9141-88
Continued Table A4
a. The driving road surface and construction method shall comply with the provisions of 3.1.1.2 b. The obstacle overcoming height of the wheel excavator shall be 0.5 of the minimum ground clearance Times: The measurement parameters include the average speed!
c. The obstacle clearance height of the belt-type excavator is 150mm Appendix B
Test table
(reference)
Table B1 Structural static stress table
Output number:
Test location:
Final reading
Coefficient n
Measured value
Test load:
Second time
Initial reading Final reading
Test instrument:
Sensitivity coefficient:
Tangential force
Lateral force
Third time
Final reading
Initial reading
Excitation value
Tested component
Frame, bridge||t t||Research, outriggers
and tracks
variable strain
stress preparation
average value correction
MPaNote
Prototype model:
Recorder model:
Test conditions:
Measuring point number
Component name
Additional instructions:
Self-weight strain
GE9141—88
Table B2 Structural dynamic stress table
Factory number:
Test date:
Soil level:
Dynamic strain
Calibration coefficient
This standard is under the jurisdiction of Beijing Institute of Construction Machinery, Ministry of Urban and Rural Construction and Environmental Protection. This standard was drafted by Tianjin Engineering Machinery Research Institute of the State Machinery Industry Commission. Strain gauge model:
Test location:
Synthetic strain
Strain value
This standard is entrusted to Dajin Engineering Machinery Research Institute of the State Machinery Industry Commission for interpretation. μa
Synthetic stressEach half turn
Tested components
Working device
and turntable
Frame, bridge
Shell, support
and crawler
·Serial number
Name of working condition
Straight driving obstacle overcoming condition
Prototype model:
Test date:
Test position: Bucket hydraulic pressure sign length
Arm hydraulic cylinder length
Boom hydraulic cylinder length
Strain gauge
First time
Initial reading of sensitive resistance
GB 9141-88
Continued Table A4
a. The driving road surface and construction method shall comply with the provisions of 3.1.1.2 b. The obstacle overcoming height of the wheel excavator shall be 0.5 of the minimum ground clearance Times: The measurement parameters include the average speed!
c. The obstacle clearance height of the belt-type excavator is 150mm Appendix B
Test table
(reference)
Table B1 Structural static stress table
Output number:
Test location:
Final reading
Coefficient n
Measured value
Test load:
Second time
Initial reading Final reading
Test instrument:
Sensitivity coefficient:
Tangential force
Lateral force
Third time
Final reading
Initial reading
Excitation value
Tested component
Frame, bridge||t t||Research, outriggers
and tracks
variable strain
stress preparation
average value correction
MPaNote
Prototype model:
Recorder model:
Test conditions:
Measuring point number
Component name
Additional instructions:
Self-weight strain
GE9141—88
Table B2 Structural dynamic stress table
Factory number:
Test date:
Soil level:
Dynamic strain
Calibration coefficient
This standard is under the jurisdiction of Beijing Institute of Construction Machinery, Ministry of Urban and Rural Construction and Environmental Protection. This standard was drafted by Tianjin Engineering Machinery Research Institute of the State Machinery Industry Commission. Strain gauge model:
Test location:
Synthetic strain
Strain value
This standard is entrusted to Dajin Engineering Machinery Research Institute of the State Machinery Industry Commission for interpretation. μa
Synthetic stress
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.