This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of crawler bulldozers. This standard applies to crawler bulldozers with mechanical and hydraulic transmissions with a rated power of 74.250 kW (hereinafter referred to as bulldozers). Bulldozers with a rated power greater than 250 kW can also be used as a reference. This standard does not apply to low-pressure wetland bulldozers, static pressure transmission bulldozers and other variant products. JB/T 7306-1994 Technical Conditions for Crawler Bulldozers JB/T7306-1994 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7306-94
Crawler Bulldozer
Published on 1994-07-18
Technical Conditions
Implemented on 1995-07-01
Ministry of Machinery Industry of the People's Republic of China:
Mechanical Industry Standard of the People's Republic of China
Crawler Bulldozer
Technical Conditions
Subject Content and Scope of Application
JB/T 7306-94
ZBJ85005-87
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of crawler bulldozers. This standard applies to crawler bulldozers with mechanical and hydraulic transmissions of rated power of 74 to 250 kW (hereinafter referred to as bulldozers). Bulldozers with rated power greater than 250kW can also be used for reference. This standard does not apply to wetland bulldozers with low specific pressure, bulldozers with static pressure transmission and other variant products. 2 Reference standards
GB2828
GB6231
GB8419
GB/T13306
JB1666
JB3306
Standard gauge railway locomotive and vehicle limits
Count sampling procedures and sampling tables for batch inspection (applicable to continuous batch inspection)Determination method of tractor cleanliness
Earth-moving machinery driver seat vibration test method and limit plate
Belt-type bulldozer test method
Work Engineering machinery storage and storage
Engineering machinery noise measurement method
JB/T5936~5947 General technical conditions for engineering machinery JB/T51007
JB/T51029
3 Technical requirements
3.1 General requirementswww.bzxz.net
Reliability test methods, fault classification and evaluation of crawler bulldozers Engineering machinery product coating quality classification
3.1.1 Bulldozers should be manufactured according to product drawings and technical documents approved by the prescribed procedures, and should comply with the provisions of this standard. 3.1.2 For bulldozers of the same model, wearing parts should be as universal and interchangeable as possible; bulldozers of the same model should use universal parts as much as possible. 3.1.3 All castings, forgings, weldings, machining, heat treatments and assembly parts of bulldozers must comply with the relevant provisions of JB/T5936~5945 in addition to the technical requirements specified in the drawings.
3.1.4 The purchased parts of the bulldozer shall comply with the provisions of relevant standards. The purchased parts and outsourced parts must have a certificate of conformity. The main engine manufacturer shall conduct sampling inspection and confirm that they are qualified before they can be used.
3.1.5 The raw materials shall have a qualified mark or quality assurance certificate from the quality inspection department of the supplier. The main engine manufacturer shall conduct sampling inspection and confirm that they are qualified before they can be used.
3.1.6 The capacity of the fuel tank shall ensure that the bulldozer can operate continuously for 10 hours. 3.1.7 The structural design of the bulldozer shall ensure convenience and safety in use, maintenance and repair. 3.2 Performance parameters and quality requirements
3.2.1 Specific power
Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
The specific power of the bulldozer shall not be less than 5.6kW/t. 3.2.2 Maximum traction force
JB/T7306-94
The maximum traction force of a bulldozer should not be less than 0.78 times its own weight (the ground adhesion coefficient should be greater than 0.81). 3.2.3 Maximum traction efficiency
For mechanical transmission type, it should not be less than 70%;
For hydraulic mechanical transmission type, it should not be less than 62%.
Maximum productivity
When the bulldozer power is <103kW and the transport distance is 20m, the maximum productivity should not be less than 2.3m/(kW·h); when the bulldozer power is 103~170kW.40m transport distance, the maximum productivity should not be less than 1.2m/(kW·h); when the bulldozer power is >170~250kW and the transport distance is 40m, the maximum productivity should not be less than 1.1m/(kW·h), Reliability
The bulldozer reliability operation is 1000h, and the mean trouble-free working time MTBF should not be less than 150h; b. The K value of the bulldozer reliability rate should not be less than 80%. 3.2.6 Life of the first overhaul period
Under normal use and maintenance conditions, the life of the bulldozer during the first overhaul period should not be less than 5000h. 3.2.7 Slope performance
The bulldozer should be able to climb a 30° longitudinal slope smoothly. 3.2.8 Braking performance
On a 30° longitudinal slope, the bulldozer should be able to stop reliably when braking uphill. When braking after automatically sliding downhill for 1m from zero speed, it should be able to stop reliably within the track contact length. 3.2.9 Steering performance
When the bulldozer is turning at the first gear speed, the track on the braked side is not allowed to roll. 3.2.10 Starting performance
The bulldozer should be able to start smoothly at an ambient temperature of not less than -5°C without taking any measures. 3.2.11 Sealing performance
The bulldozer shall stop after 3 hours of bulldozing operation. No oil or water leakage is allowed in the sealing parts within 15 minutes. 3.2.12 Cleanliness
The oil cleanliness of the hydraulic system tank of the bulldozer working device shall not be greater than 2mg/100mL; the oil cleanliness of the rear axle box of the bulldozer transmission system shall not be greater than 20mg/100mL. Noise
The noise value at the driver's ear of the bulldozer's open-type cab shall not be greater than 97dB(A); the noise value at the driver's ear of the bulldozer's low-noise cab shall not be greater than 90dB(A) When the rated power of the bulldozer is not greater than 80kW, the external noise value of the machine shall not be greater than 112dB(A); when the rated power of the bulldozer is not greater than 100kW, the external noise value of the machine shall not be greater than 114dB(A); when the rated power of the bulldozer is not greater than 130kW, the external noise value of the machine shall not be greater than The sound value should not exceed 116dB(A); when the rated power of the bulldozer is not more than 160kW, the external disc sound value should not exceed 118dB(A); when the rated power of the bulldozer is not more than 200kW, the external noise value should not exceed 120dB(A); when the rated power of the bulldozer is not more than 250kW, the external noise value should not exceed 122dB(A); when the rated power of the bulldozer is not more than 300kW, the external noise value should not exceed 124dB(A). Speed
The forward speed of the bulldozer in the first gear should not be less than 2.2km/h; the forward speed of the bulldozer in the highest gear should not be less than 9.5km/h. Blade lifting speed
JB/T 730694
The bulldozer blade lifting speed should not be less than 0.3m/s. 3.2.16 Natural settlement of the blade
The natural settlement of the bulldozer blade within 15min should not be greater than 150mm. 3.2.17 Operating force
The operating force of the bulldozer main clutch with booster should not be greater than 150N, and the operating force without booster should not be greater than 195N: the operating force of the bulldozer steering clutch should not be greater than 90N; the operating force of the bulldozer foot pedal should not be greater than 195N; d.
The operating force of the bulldozer mechanical gearbox should not be greater than 120N: e.
The operating force of the bulldozer power gearbox should not be greater than 50N.3.2.18 The maximum acceleration transmission rate of the bulldozer seat should not be greater than 2: The root mean square value of the bulldozer seat acceleration should not be greater than 1.65m/s. 3.2.19 Painting quality
The surface of each painted part of the bulldozer should comply with the relevant provisions of JB/T51029 (qualified products). 3.2.20 Appearance quality
The appearance of the bulldozer should be flat and free of rust, and the casting, forging, welding and painting workpieces should be uniform and bright. The full score is 10 points, and it should not be less than 6 points. 4 Test method
4.1 Specific power determination
Specific power-
Rated power of bulldozer
Bulldozer structural weight
The rated power of the bulldozer in the formula refers to the net power output of the flywheel of the engine, and the structural weight of the bulldozer refers to the weight of the machine without the ripper, cab, fuel, water and driver. The method for determining the machine weight shall comply with the provisions of JB1666. 4.2 Maximum productivity determination
The test time for the maximum productivity of the bulldozer is selected to be 15 to 30 minutes, and the test conditions shall comply with the provisions of JB1666. 4.3 Determination of reliability index
Determination of bulldozer reliability MTBF and machine output rate K, test method and evaluation method shall be carried out in accordance with the provisions of JB/T51007. 4.4 Determination of starting performance
Determination of bulldozer starting performance shall be carried out in accordance with the provisions of the product manual. The starting motor dragging time shall not exceed 15s each time. The test shall be repeated 3 times, with an interval of 2 minutes between each two times. At least 1 of the 3 times shall be successful. 4.5 Determination of dense performance
The determination of the sealing performance of the bulldozer shall be carried out immediately after the bulldozer is stopped for 3 hours. Within 15 minutes, check whether there is any seepage at the sealing joint surface.
4.6 Determination of cleanliness
The determination of the cleanliness of the compressed oil of the bulldozer shall be carried out immediately after the bulldozer is stopped for 3 hours. Take 200mL of oil sample from the upper, middle and lower parts of the oil pool, filter it with a filter membrane with a nominal pore size of 0.8μm, take out the impurities, dry and weigh them, and the test method shall be in accordance with the provisions of GB6231. 4.7 Determination of noise
The determination of the ear noise and external noise of the bulldozer driver shall be carried out in accordance with the provisions of JB3774.2. When measuring the fixed value working condition, the engine speed shall be within the range of the calibrated speed to 50 revolutions.
4.8 Determination of seat dynamic comfort
The dynamic comfort test method of the bulldozer driver's seat shall be in accordance with the provisions of GB8419. 4.9 Painting and appearance measurement
The regular inspection of the quality of the installation only checks the appearance of the topcoat layer and the adhesion of the primer layer. The appearance is visually inspected, and the primer layer is scratched with a sample plate. However, the type inspection and grading inspection shall be in accordance with the provisions of JB/T51029. Appearance measurement Check whether the surface of the casting, forging, welding and processing parts is flat and smooth, and whether there are defects such as flash, burrs, sand inclusions, welding defects, scratches, cracks, etc.; check whether the lines and pipelines are arranged neatly and firmly; check whether the appearance of the whole machine is beautiful and generous. If the evaluation is done by 3 to 5 people scoring, the average value is taken.
4.10 Determination of other items
The determination methods of the maximum traction force, maximum traction efficiency, climbing, braking, steering performance, blade lifting speed, natural settlement and the control force of each part of the bulldozer are all in accordance with the provisions of JB1666. 5 Inspection rules
5.1 Inspection type
5.1.1 Factory inspection
Each finished bulldozer should be inspected at the factory, and no-load operation and load operation tests should be carried out according to the factory inspection outline of each factory. Check the technical conditions of the main components and the working performance of the whole machine. Only after confirming that it is qualified can it be shipped out of the factory. The product should be accompanied by a certificate of conformity when it leaves the factory. 5.1.2 Type inspection
Type inspection must be carried out when new products are identified, old products are modified or transferred to other factories for production. Type inspection must be carried out every 5 years and is valid for 5 years after passing.
5.1.3 Periodic inspection
At least one bulldozer shall be selected every year and inspected for the following items according to the method of JB1666: a.
Steering performance;
Sealing performance;
Oil cleanliness;
Operation sound:
Blade lifting speed;
Natural settlement of shovel blade:
Operation force.
5.2 Judgment rules
The test results of each item shall meet the requirements of technical performance and quality indicators specified in this standard. 6 Marking, packaging, transportation and storage
Each bulldozer should have a product label fixed in a conspicuous position, and its type and size should comply with the provisions of GB/T13306. The label should state the following 6.1
Product name and model:
Main parameters of the product:
Manufacturer name or trademark:
Manufacturing date:
Factory number.
6.2A sign indicating the working position of the operating mechanism should be installed in front of the control panel. 6.3
The packaging of the bulldozer should comply with the relevant provisions of JB/T5947. 6.4
The transportation of the bulldozer should comply with the relevant provisions of GB146.1. 6.5 The storage and preservation of bulldozers shall comply with the relevant provisions of JB3306, 7 Quality Assurance
7.1 Under the premise that the user complies with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the quality and technical performance of the product meet the requirements of the accompanying technical 4
JB/T7306-94
parts and this standard. During the warranty period, if the parts are damaged due to manufacturing quality problems, they shall be repaired or replaced free of charge. 7.2 The warranty period is valid for 12 months from the date of shipment from the manufacturer (based on the date of the delivery invoice), but the operating time shall not exceed 1000h, or in accordance with the provisions of the contract between the two parties.
Additional Notes:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was jointly drafted by the Tianjin Engineering Machinery Research Institute, Shandong Bulldozer General Factory, Shanghai Pengpu Machinery Factory and Xuanhua Engineering Machinery Factory. The main drafters of this standard are Li Mingxiang, Xia Changkun, Cha Chunguang and Liu Jianguo.
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