Some standard content:
Mechanical Industry Standard of the People's Republic of China
Hand Chain Hoist
Subject Content and Scope of Application
JB/T 7334-
Replaces ZBJ80014-89
This standard specifies the classification, technical requirements, test methods, inspection rules, marking and packaging of hand chain hoists. This standard is mainly applicable to hand chain hoists with involute spur gear transmission for general purposes with a rated lifting capacity of 0.5 to 32 tons, and hand chain hoists of other structural forms should also be used as a reference. 2 Reference standards
GB783 Maximum lifting capacity series of lifting machinery
GB4829 General acceptance rules for short-link chains for lifting
GB5802 Short-link chains for lifting - T (8) grade calibration chains for hoists and other lifting equipment GB/T13384 General technical conditions for packaging of electromechanical products JB4207 Hooks for manual lifting equipment
ZBJ80004 Hook locking device for manual lifting equipment 3 Classification
3.1 Working level
The working level of hand chain hoists is divided into two levels according to their use conditions: a. Z level
3.2 Specifications
Heavy load frequent use;
Light load, infrequent use.
The rated lifting capacity of hand chain hoists and their corresponding working levels shall comply with the provisions of Table 1. Table 1
Rated lifting capacity Gn, t
Working level
3.3 Basic parameters
Z level.Q level
The basic parameters of the hand chain hoist shall comply with the provisions of Figure 1 and Table 2. Approved by the Ministry of Machinery Industry of the People's Republic of China on July 18, 1994 2.5
Implementation on July 1, 1995
Rated lifting capacity
Standard lifting height H
JB/T7334—94
Minimum distance between two hooks Hmn
Note:) H in the table refers to the distance between the lowest and highest working positions of the lower hook. Q grade
≤600
②Ha in the table refers to the distance between the inner edges of the upper and lower hook cavities when the lower hook rises to the limit working position. 3.4 Product marking
3.4.1 Model indication method
3.4.2 Marking example
JB/T7334-94
-Lifting height, m
Rated lifting capacity, t
Working level||t t||Product code
The product with rated lifting capacity of 2t, working level of Q and lifting height of 4m is marked as: Hand chain hoist HSQ2-4JB/T7334—94
4 Technical requirements
4.1 Performance
4.1.1 No-load action
When the hand chain hoist is in the no-load state, pull the hand chain, and the operation of each mechanism should be flexible without any jamming or intermittent looseness or tightness. 4.1.2 Dynamic load performance
When the hand chain hoist is subjected to the dynamic load test, it shall be able to withstand the test load specified in Table 3, and shall be lifted and lowered once according to the test lifting height specified in Table 4, and the following requirements shall be met at the same time: a.
The meshing between the lifting chain and the lifting sprocket and the cruise wheel, and between the hand chain and the hand chain wheel shall be good; the gear pair shall operate smoothly without abnormal phenomena, and the lifting chain shall not be twisted or kinked during the lifting and lowering process; the hand pulling force shall not change greatly;
The brake shall operate reliably.
Rated lifting weight G.
Test load
Number of lifting chain rows
Test lifting height/mm
Note: The table refers to the number of lifting chain rows on one machine body. 4.1.3 Braking performance
Hand chain hoists are tested under the test loads specified in Table 5. The weight is lowered to a height equivalent to one rotation of the lifting sprocket, and then left to stand for 1 hour. The weight shall not fall naturally. Table 5
Rated lifting weight G
Test load
1 time 0.125
4.1.4 Overall efficiency
JB/T 7334-94
Hand chain hoists are tested under the test loads specified in Table 5. The overall efficiency is obtained by formula (1), and its calculated value shall comply with the requirements of Table 6. QD
nDniFn
In the formula: \
Efficiency of the whole machine, %
Rated load (force at rated lifting weight), kNNumber of lifting chain rows;
Pitch circle diameter of lifting chain wheel. mm;
Dh-pitch circle diameter of hand chain wheel, mm;
Total gear reduction ratio;
Average hand pulling force measured, kN.
Rated lifting weight G./t
Efficiency/%www.bzxz.net
Note: The efficiency of 21 and 3.2t Z-level hand chain hoists with double chains is not less than 70%. 4.1.5 Continuous action performance
(1)
The hand chain hoist is loaded with the test load specified in Table 3, and is continuously lifted and lowered to the test lifting height specified in Table 4 to the number of actions specified in Table 7 (one lifting and lowering reciprocating cycle is one time). After the test, the hand chain hoist must meet the requirements of Articles 4.1.2 and 4.1.3, and no abnormal phenomenon should occur in any part, and the whole machine can still work normally. Table 7
Rated lifting weight G./t
Continuous number of actions
4.1.6 Limiting strength of the whole machine
[Grade B
When the hand chain hoist is in the unloaded state, 2.5 times the rated hand pull force is applied on the descending side of the hand chain, and the whole machine should be able to withstand it reliably without any damage.
Note: The rated hand pull force refers to the nominal value of the hand pull force required to lift the rated load. 4.1.7 Static load performance
The hand chain hoist must be able to support a static tensile load of 4 times the rated lifting capacity. 4.2 Main components
4.2.1 The hook shall comply with the provisions of JB4207. The lower hook shall be equipped with a hook mouth locking device that complies with the provisions of ZBJ80004. The hook shall be able to rotate 360° on the horizontal plane.
4.2.2 The lifting chain shall comply with the provisions of GB4829 and GB5802. 4.2.3 The relationship between the grade of the lifting chain and the grade of the hand chain hoist shall comply with the provisions of Table 8. Table 8
Working level of hand chain hoist
4.2.4 The hand chain shall comply with the provisions of Figure 2 and Table 9. 186
Grade of lifting chain
≥T(8)
≥M(4)
Nominal diameter
Diameter limit deviation
Single link pitch
Note: The connecting ring of the hand chain is not allowed to be welded. JB/T 7334-94
Single link pitch limit deviation
Ultimate working load
4.2.5 The hand chain hoist must be equipped with a tail ring limit device and should be able to meet the requirements of Article 4.1.6. Breaking load
Weight per meter
4.2.6 The hand chain hoist should be equipped with appropriate chain guide and chain stop devices to assist the correct engagement of the chain and sprocket, and ensure that the chain does not fall off from the sprocket ring groove when the hand chain hoist is placed or shaken at will. 4.2.7 The lifting sprocket and the wheel of the Class B chain hoist must use suitable rolling bearings. 4.2.8 The brake is a mechanical brake composed of a friction plate, a pawl and a ratchet wheel. When the hand chain stops pulling, it should be able to brake immediately and reliably support the hoisted load.
4.2.9 The brake and gear pair should be equipped with appropriate shields to prevent dust, mud, etc. from entering. 4.3 Appearance
4.3.1 All parts of the chain hoist should be well made. There should be no defects such as scratches and burrs that affect the use. 4.3.2 The exposed surface of the chain hoist that has not been machined should be painted, and the coating should be uniform and the color should be consistent. 4.3.3 The exposed machined surface of the chain hoist should be properly treated and should not be rusted. 5 Test method
5.1 No-load action check
Hang the hand chain on the bracket, and pull the hand chain back and forth manually in the no-load state to make the lower hook rise and fall once, and the test lifting height is as specified in Table 4. The test results should meet the requirements of Article 4.1.1. 5.2 Dynamic load test
Install the hand chain on the test bench and load it according to the test load specified in Table 3, and drive it manually or by other similar mechanical methods simulating manual operation, but the linear speed of the hand chain shall not exceed 15m/min. Lift and fall once according to the test height specified in Table 4. The test results should meet the requirements of Article 4.1.2.
5.3 Braking performance test
Install the hand chain on the test bench and load it with the test load specified in Table 5. Test separately. During the test, lift the load by 300mm; then manually lower the load to the height equivalent to one rotation of the lifting chain wheel, and check the braking performance of the brake by feel and visual inspection. The test results shall meet the requirements of Article 4.1.3.
5.4. Determination of the overall efficiency
The average hand pull force is measured by the electric measurement method on the hand chain hoist tension measuring equipment, and then the overall efficiency is calculated. First, the test equipment should be calibrated, and then the load of the rated lifting weight is hung on the hand chain hoist to be tested. Pull the hand chain to adjust the position of the lifting sprocket. Make it in the position where the lifting chain applies the maximum torque to it, then use the tension electric measurement equipment to drive the hand chain hoist to lift the load, and use the electric measurement method to measure the average hand pull force Fhl in the process of the lifting sprocket rotating through a flat ring groove and a vertical ring groove. The rotation angle of the lifting sprocket is converted by the number of rings of the hand chain. Repeat the above test when the lifting sprocket is in the position where the lifting chain applies the minimum torque to it, and measure the average hand pull force F2. Take the average value of Fh and Fh2 to get the measured average hand pull force Fh. Then calculate the whole machine efficiency according to formula (1) in Article 4.1.4. The test results shall comply with the requirements of Table 6.
5.5 Continuous action performance test
The test is carried out on the test bench. The test load, lifting height and speed of the hand chain are the same as the dynamic load test. It is mechanically driven, and the working cycle is lifting-stopping-lowering-stopping. During the test, the power-on duration of the electrical equipment is 40%. During the entire test, the load should not touch the ground. The lifting chain and gears are allowed to be lubricated. The test results shall comply with the requirements of Article 4.1.5. 5.6 Whole machine limit strength test
First, lower the lifting chain to the limit position to put the tail ring limit device in working condition, and then slowly hang a load equal to 2.5 times the rated hand pull force on the descending side of the hand chain and keep it for 1 minute. The test results shall comply with the requirements of Article 4.1.6. During the test, appropriate methods can be used to reduce the deflection of the hand chain hoist caused by unbalanced weight and affect the test. 5.7 Static load test
Clamp the chain hoist with a clamp on the universal material testing machine. The diameter of the clamp at the connection with the hook is about 1/3 of the hook cavity diameter. If the stroke of the testing machine is limited, it is allowed to remove the upper and lower hooks for separate tests. When clamping the chain hoist, the lifting sprocket should be in the position where the lifting chain applies the maximum torque to it. During the test, load slowly and evenly until the value required by Article 4.1.7 is reached, and maintain for 1 minute. 5.8 Determination of the breaking force and total ultimate elongation of the lifting chain The determination of the breaking force and total ultimate elongation of the lifting chain shall comply with the provisions of GB4829. 5.9 Determination of the N-ring pitch deviation of the lifting chain On the universal material testing machine, a lifting chain sample with an appropriate number of rings randomly sampled is installed in the clamp, and a tensile force of 5% of the chain verification force is applied to tighten the chain segment, as shown in Figure 3. Lout, 2d, and 2d2 are measured three times and the average value is taken. Then calculate L and △L according to formula (2) and formula (3). The AL value shall comply with the provisions of Article 4.3.2.2 of GB5802. L=Lout
2d,+2d2
ALL-NP
-N ring pitch total length, mm;
Where: L-
P——single ring pitch nominal value, mm;
AL-N ring pitch deviation, mm;
N——its value is equal to 2 times the number of hoisting sprocket grooves plus 1. Lout
5.10 The hook mouth deformation test and overload test shall comply with the provisions of Chapter 5 of JB4207. 5.11 Determination of the minimum distance between the two hooks and the standard lifting height (2)
Load the hand chain hoist with an appropriate load on the test bench, lift the lower hook to the upper limit working position, measure the distance between the inner edges of the upper and lower hook cavities Hmia (see Figure 1), then lower the lower hook to the lower limit working position, and measure the distance between the inner edges of the upper and lower hook cavities Hmx188
(see Figure 1). The standard lifting height is obtained by formula (4): The measurement result should comply with the provisions of Article 3.3.
6 Inspection rules
6.1 Type inspection
JB/T7334—94
H=Hmax -Hmin
6.1.1 Type inspection should generally be carried out when any of the following situations occurs: a.
Trial production and identification of new products or old products transferred to other factories for production; b.
The structure, materials and processes of the products have undergone major changes, which may affect the performance; c
Products in normal production should be inspected at least once a year; when the product is discontinued for more than half a year and production is resumed; when the results of the final inspection are significantly different from those of the last type inspection; when the national quality supervision agency requires type inspection. The type inspection items are as follows:
Appearance quality inspection, visual inspection shall be carried out in accordance with the requirements of Article 4.3; no-load action inspection shall be carried out in accordance with Article 5.1; the minimum distance between the two hooks and the standard lifting height shall be determined in accordance with Article 5.11; the dynamic load test shall be carried out in accordance with Article 5.2:
The braking performance test shall be carried out in accordance with Article 5.3; the whole machine efficiency determination shall be carried out in accordance with Article 5.4; the continuous action performance test shall be carried out in accordance with Article 5.5: the whole machine limit strength test shall be carried out in accordance with Article 5.6; the static load performance test shall be carried out in accordance with Article 5.7; the breaking force and total ultimate elongation of the lifting chain shall be determined in accordance with Article 5.8; the N-link pitch deviation of the lifting chain shall be determined in accordance with Article 5.9; k.
The hook mouth deformation test and overload test shall be carried out in accordance with Article 5.10. 6.2 Factory Inspection
6.2.1 Each chain hoist shall be inspected and qualified by the manufacturer before it can be shipped out of the factory, and a product certificate shall be issued. 6.2.2 The factory inspection items shall be carried out in accordance with the provisions of 6.1.2a, 6.1.2b and 6.1.2d. 7 Marking and Packaging
Each chain hoist shall have a product label that is not easily lost. The label shall indicate:
b. Manufacturer name;
d. Product model;
e. Main parameters and working level of the product;
Date of manufacture (or number) or production batch number. 7.2 Packaging
(4)
When the chain hoist leaves the factory, it shall be properly packaged in accordance with the requirements of GB/T13384 to ensure that the product is not corroded or damaged and meets the relevant transportation requirements.
7.3 The following documents shall be attached to the products before they leave the factory:
a. Product certificate;
Product use and maintenance instructions.
Additional instructions:
JB/T7334--94
This standard is proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hangzhou Shenli Hoisting Hoist Factory. The main drafters of this standard are Huang Zhenyuan and Hu Weimin. This standard is equivalent to the Japanese standard JISB8802-1989 "Hand Chain Hoist". 1909 Determination of the deviation of the pitch of N links of the lifting chain. On the universal material testing machine, randomly sample the lifting chain sample with an appropriate number of links and install it into the fixture, and apply a tensile force of 5% of the chain verification force to tighten the chain segment, as shown in Figure 3. Measure Lout, 2d, and 2d2 three times and take the average value. Then calculate L and △L according to formula (2) and formula (3). The AL value should comply with the provisions of Article 4.3.2.2 of GB5802. L=Lout
2d,+2d2
ALL-NP
-N-link pitch total length, mm;
Where: L-
P——single-link pitch nominal value, mm;
AL-N-link pitch deviation, mm;
N——its value is equal to 2 times the number of lifting sprocket grooves plus 1. L外
5.10 The hook mouth deformation test and overload test shall comply with the provisions of Chapter 5 of JB4207. 5.11 Determination of the minimum distance between the two hooks and the standard lifting height (2)
Load the hand chain hoist with an appropriate load on the test bench, lift the lower hook to the upper limit working position, measure the distance between the inner edges of the upper and lower hook cavities Hmia (see Figure 1), then lower the lower hook to the lower limit working position, and measure the distance between the inner edges of the upper and lower hook cavities Hmx188
(see Figure 1). The standard lifting height is obtained by formula (4): The measurement result shall comply with the provisions of Article 3.3.
6 Inspection rules
6.1 Type inspection
JB/T7334—94
H=Hmax -Hmin
6.1.1 Type inspection should generally be carried out when any of the following situations occurs: a.
Trial production and identification of new products or old products transferred to other factories for production; b.
The structure, materials and processes of the products have undergone major changes, which may affect the performance; c
Products in normal production should be inspected at least once a year; when the product is discontinued for more than half a year and production is resumed; when the results of the final inspection are significantly different from those of the last type inspection; when the national quality supervision agency requires type inspection. The type inspection items are as follows:
Appearance quality inspection, visual inspection shall be carried out in accordance with the requirements of Article 4.3; no-load action inspection shall be carried out in accordance with Article 5.1; the minimum distance between the two hooks and the standard lifting height shall be determined in accordance with Article 5.11; the dynamic load test shall be carried out in accordance with Article 5.2:
The braking performance test shall be carried out in accordance with Article 5.3; the whole machine efficiency determination shall be carried out in accordance with Article 5.4; the continuous action performance test shall be carried out in accordance with Article 5.5: the whole machine limit strength test shall be carried out in accordance with Article 5.6; the static load performance test shall be carried out in accordance with Article 5.7; the breaking force and total ultimate elongation of the lifting chain shall be determined in accordance with Article 5.8; the N-link pitch deviation of the lifting chain shall be determined in accordance with Article 5.9; k.
The hook mouth deformation test and overload test shall be carried out in accordance with Article 5.10. 6.2 Factory Inspection
6.2.1 Each chain hoist shall be inspected and qualified by the manufacturer before it can be shipped out of the factory, and a product certificate shall be issued. 6.2.2 The factory inspection items shall be carried out in accordance with the provisions of 6.1.2a, 6.1.2b and 6.1.2d. 7 Marking and Packaging
Each chain hoist shall have a product label that is not easily lost. The label shall indicate:
b. Manufacturer name;
d. Product model;
e. Main parameters and working level of the product;
Date of manufacture (or number) or production batch number. 7.2 Packaging
(4)
When the chain hoist leaves the factory, it shall be properly packaged in accordance with the requirements of GB/T13384 to ensure that the product is not corroded or damaged and meets the relevant transportation requirements.
7.3 The following documents shall be attached to the products before they leave the factory:
a. Product certificate;
Product use and maintenance instructions.
Additional instructions:
JB/T7334--94
This standard is proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hangzhou Shenli Hoisting Hoist Factory. The main drafters of this standard are Huang Zhenyuan and Hu Weimin. This standard is equivalent to the Japanese standard JISB8802-1989 "Hand Chain Hoist". 1909 Determination of the deviation of the pitch of N links of the lifting chain. On the universal material testing machine, randomly sample the lifting chain sample with an appropriate number of links and install it into the fixture, and apply a tensile force of 5% of the chain verification force to tighten the chain segment, as shown in Figure 3. Measure Lout, 2d, and 2d2 three times and take the average value. Then calculate L and △L according to formula (2) and formula (3). The AL value should comply with the provisions of Article 4.3.2.2 of GB5802. L=Lout
2d,+2d2
ALL-NP
-N-link pitch total length, mm;
Where: L-
P——single-link pitch nominal value, mm;
AL-N-link pitch deviation, mm;
N——its value is equal to 2 times the number of lifting sprocket grooves plus 1. L外
5.10 The hook mouth deformation test and overload test shall comply with the provisions of Chapter 5 of JB4207. 5.11 Determination of the minimum distance between the two hooks and the standard lifting height (2)
Load the hand chain hoist with an appropriate load on the test bench, lift the lower hook to the upper limit working position, measure the distance between the inner edges of the upper and lower hook cavities Hmia (see Figure 1), then lower the lower hook to the lower limit working position, and measure the distance between the inner edges of the upper and lower hook cavities Hmx188
(see Figure 1). The standard lifting height is obtained by formula (4): The measurement result shall comply with the provisions of Article 3.3.
6 Inspection rules
6.1 Type inspection
JB/T7334—94
H=Hmax -Hmin
6.1.1 Type inspection should generally be carried out when any of the following situations occurs: a.
Trial production and identification of new products or old products transferred to other factories for production; b.
The structure, materials and processes of the products have undergone major changes, which may affect the performance; c
Products in normal production should be inspected at least once a year; when the product is discontinued for more than half a year and production is resumed; when the results of the final inspection are significantly different from those of the last type inspection; when the national quality supervision agency requires type inspection. The type inspection items are as follows:
Appearance quality inspection, visual inspection shall be carried out in accordance with the requirements of Article 4.3; no-load action inspection shall be carried out in accordance with Article 5.1; the minimum distance between the two hooks and the standard lifting height shall be determined in accordance with Article 5.11; the dynamic load test shall be carried out in accordance with Article 5.2:
The braking performance test shall be carried out in accordance with Article 5.3; the whole machine efficiency determination shall be carried out in accordance with Article 5.4; the continuous action performance test shall be carried out in accordance with Article 5.5: the whole machine limit strength test shall be carried out in accordance with Article 5.6; the static load performance test shall be carried out in accordance with Article 5.7; the breaking force and total ultimate elongation of the lifting chain shall be determined in accordance with Article 5.8; the N-link pitch deviation of the lifting chain shall be determined in accordance with Article 5.9; k.
The hook mouth deformation test and overload test shall be carried out in accordance with Article 5.10. 6.2 Factory Inspection
6.2.1 Each chain hoist shall be inspected and qualified by the manufacturer before it can be shipped out of the factory, and a product certificate shall be issued. 6.2.2 The factory inspection items shall be carried out in accordance with the provisions of 6.1.2a, 6.1.2b and 6.1.2d. 7 Marking and Packaging
Each chain hoist shall have a product label that is not easily lost. The label shall indicate:
b. Manufacturer name;
d. Product model;
e. Main parameters and working level of the product;
Date of manufacture (or number) or production batch number. 7.2 Packaging
(4)
When the chain hoist leaves the factory, it shall be properly packaged in accordance with the requirements of GB/T13384 to ensure that the product is not corroded or damaged and meets the relevant transportation requirements.
7.3 The following documents shall be attached to the products before they leave the factory:
a. Product certificate;
Product use and maintenance instructions.
Additional instructions:
JB/T7334--94
This standard is proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hangzhou Shenli Hoisting Hoist Factory. The main drafters of this standard are Huang Zhenyuan and Hu Weimin. This standard is equivalent to the Japanese standard JISB8802-1989 "Hand Chain Hoist". 190
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