JB/T 7685.2-1995 Technical requirements for electromagnetic block brakes
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Electromagnetic Block Brake
Technical Conditions
Subject Content and Scope of Application
JB/T 7685.2—1995
This standard specifies the technical requirements, test methods and inspection rules for electromagnetic block brakes (hereinafter referred to as brakes). This standard applies to normally closed block brakes with brake electromagnets (hereinafter referred to as electromagnets) as driving devices. 2 Reference standards
Technical conditions for high-quality carbon structural steel
GB 699
Carbon structural steel
GB1222
Spring steel
Technical conditions for hot-rolled cylindrical helical springs
GB 4942.2
Protection grade for low-voltage electrical enclosures
GB8923
Rust grade and rust removal grade of steel surface before paintingGB9286 Cross-cut test for paint and varnish filmGB9439
Gray cast iron parts
GB/T 13384
General technical conditions for packaging of electromechanical products
JB 6406.2
Technical conditions for electric hydraulic block brakes
General technical requirements for brake electromagnets
JB/T6451
Block brake pads
JB/T 7021.2
JB/T7021.3
3 Technical requirements
3.1 Working conditions
Block brake pads
3.1.1 The power supply for the brake is divided into two types: AC and DC. The voltage level of the AC power supply is generally 380V and the frequency is 50Hz; the voltage level of the DC power supply is generally 220V. The allowable voltage fluctuation is: the upper limit does not exceed 10% of the rated voltage, and the lower limit (at peak current) does not exceed -15% of the rated voltage.
3.1.2 The basic working modes of the electromagnet in the brake are continuous working system and intermittent cycle working system. The load factor for intermittent cycle working system is 40%, and the rated operating frequency is 1200 times/h (D≤250), 900 times/h (250≤D≤500) and 600 times/h (500D≤800).
3.1.3 The altitude of the brake use site shall not exceed 2000m. 3.1.4 When the brake is in normal use, the suitable ambient temperature is: ordinary type -25~+40, metallurgical type -5~+55℃ 3.1.5 The average relative humidity of the wettest month in the brake use site shall not exceed 90%, and the average minimum temperature of the month shall not be higher than -+-25℃.
3.1.6 There shall be no flammable, explosive and corrosive gases in the working environment around the brake. 3.2 Structural requirements
Approved by the Ministry of Machinery Industry of the People's Republic of China on June 16, 1995, and implemented on July 1, 1996
JB/T 7685.2-1995
3.2.1 The fixing method of the brake pad shall comply with the provisions of JB/T7021.2 and JB/T7021.3. When the assembly and riveting methods are adopted, the effective wear thickness of the brake pad must be guaranteed to be not less than 50% of the original thickness. 3.2.2 The brake shall be equipped with a shoe back-off distance and braking torque adjustment device, and reliable anti-loosening measures. When the working force of the brake spring is greater than 3000N, the brake spring shall be equipped with a maintenance positioning device. 3.2.3 The hinges with relative swing on the brake shall be equipped with anti-friction bearings (bearings) or oil injection devices, and the tolerance and fit of the bearings shall comply with the provisions of relevant standards. The mating surfaces of each hinge shall be coated (injected) with grease before leaving the factory. 3.2.4 The brake pads of the brake shall have position-following property. 3.2.5 The brake shall be equipped with a reliable pad retraction equalization device to ensure that the pads on both sides are basically equal in retraction when the brake is in the normal release state; no part of the brake pad cover shall float on the brake wheel. 3.2.6 The brake shall have a simple manual release function. The electromagnet shall have an armature stroke indicator. 3.2.7
3 The electromagnet and its junction box shall be made into a protective type, and the protection level of its shell shall be: ordinary type shall not be lower than IP33 specified in GB4942.2, and metallurgical type shall not be lower than IP43; for electromagnets with self-contained rectifier control devices, the protection level of the shell of the rectifier control device shall be: ordinary type shall not be lower than IP33 specified in GB4942.2, and metallurgical type shall not be lower than IP43. Note: When the rectifier control device is installed (placed) in the electrical room, control panel or cabinet of the matching host, there is no protection level requirement. 3.2.9 Other structural requirements of electromagnets shall comply with the relevant provisions of JB/T6451. 3.3 Performance requirements
3.3.1 The action performance of the brake shall comply with the following provisions: a. When the brake is operated at the rated spring working force and 85% of the rated voltage, it shall be able to be released flexibly; b. When the brake is operated at 50% of the rated spring working force and rated voltage, the electromagnet shall be able to be closed flexibly when it is instantaneously operated 1200 times per hour.
3.3.2 The braking torque performance of the brake shall comply with the following provisions a. The braking torque of the brake under the rated spring working force state shall not be less than the rated value provided; b. The brake shall allow the braking torque to be adjusted within the range of 0.51 times the rated value. 3.3.3 The performance of the electromagnet shall comply with the relevant provisions of JB/T6451 3.3.4 The friction performance of the brake pad shall comply with the provisions of JB/T7021.3. 3.4 Brake spring
3.4.1 The brake spring shall be a hot-rolled cylindrical helical compression spring, and shall be designed according to the load type. 3.4.2 The technical conditions of the brake spring shall comply with the provisions of GB1239.4. 3.5 Materials and heat treatment
3.5.1 The brake shoe shall be made of materials with mechanical properties not lower than HT200 in GB9439. 3.5.2 The brake spring shall be made of materials with mechanical properties not lower than 60Si2Mn in GB1222. The hinge shafts of the brake shall be made of materials with mechanical properties not lower than 45 steel in GB699, and the heat treatment hardness shall be 33-~38HRC. 3.5.3
3.5.4 The remaining components of the brake shall be made of materials with mechanical properties not lower than Q235-B in GB700. 3.6 Precision requirements
3.6.1 When the brake is closed under the rated spring working force, the contact area between the brake pad and the brake wheel shall not be less than 50% of the design area for pressed hard and semi-hard pads, and shall not be less than 70% of the design area for soft pads. 3.6.2 The assembly gap between the outer arc surface of the brake pad and the inner arc surface of the brake shoe shall not be greater than 0.5mm at any point. 3.7 Rust prevention and surface coating
3.7.1 The surfaces of the brake rod, spring rod, brake spring and all fasteners of the brake shall be treated with rust prevention and shall comply with the provisions of relevant standards.
3.7.2 The remaining components of the brake shall be surface coated (except for the mating surface) and meet the following requirements: a. The surface shall be derusted before painting, and the derusting level shall reach Sa2 or St3 level 1 specified in GB8923
JB/T 7685.2
—1995
h. The painted surface shall be coated with at least one layer of anti-rust primer and two layers of topcoat, and the total thickness of the paint dry film shall not be less than 75μumc. The adhesion of the paint film shall meet the secondary quality requirements specified in GB9286. d. The surface after painting shall be even, fine, bright and consistent in color, and there shall be no missing paint, wrinkles, pinholes or severe sagging. 4 Test methods
4.1-Stock requirements
4.1.1 The measuring tools and instruments used in the test shall comply with the relevant national metrological verification regulations. 4.1.2 The test environment and conditions shall comply with the provisions of Articles 3.1.4 to 3.1.6. 4.1.3 The test bench for dynamic test shall be approved by the superior competent (responsible) department or the relevant national quality supervision and inspection agency. 4.2 Structural inspection
4.2.1 Check the fixation of the brake pad by visual inspection, and check the effective wear thickness of the brake pad with a universal measuring tool. 4.2.2 Check the brake shoe backing distance, braking torque adjustment device, maintenance positioning device and anti-loosening measures by visual inspection, and operate them according to the method specified in the product to verify their effectiveness. When the backing distance and torque automatic compensation device are provided, the brake should be subjected to a static action test on the test bench to verify its effectiveness.
4.2.3 Check the lubrication of the brake by visual inspection. 4.2.4 The brake pad position, equal backlash and dynamic release function tests are carried out on the test bench in a static action test. The specific steps and methods are as follows:
a. Adjust the brake within the specified backlash range and rated spring working force state; b. Intermittently operate the brake for no less than 5 times, and check the pad position and equal backlash by visual inspection; after the pad position and equal backlash inspection is completed, close the brake and operate the manual release device 1~3c.
times according to the method specified in the product to verify its effectiveness.
4.2.5 Check the electromagnet travel indicator device using the old test method. 4.2.6 Other structural inspections of the electromagnet shall be carried out in accordance with the provisions of JB/T6451. 4.3 Performance test
4.3.1 The brake action performance test is carried out on the test bench in the form of a static action test. The specific steps and methods are as follows: a. Adjust the brake within the specified shoe block withdrawal range and rated spring working force state. First, operate the brake intermittently at the rated voltage and rated operating frequency until the electromagnet reaches a thermally stable state. Then reduce the voltage to 85% of the rated value, operate the brake intermittently for more than 10 times, and use visual inspection to check its release flexibility; b. Adjust the brake within the specified back-off range and 50% rated spring working force state, the voltage is the rated value, and the electromagnet is in a cold state at an operating frequency of 1200 times per hour. Operate the brake more than 20 times and check its closing flexibility by visual inspection. 4.3.2 The braking torque test is carried out on the test bench in the form of a dynamic test, using a test piece, and the weekly parameters are measured more than 5 times, and the average value is taken as the test result (this item can also be carried out on the main machine along with the main machine test). 4.3.3 The performance test of the electromagnet is carried out in accordance with the relevant provisions of J13/T6451. 4.3.4 The friction performance test of the brake lining is carried out in accordance with the provisions of JB/T7021.3. 4.4 Brake spring
The test of the brake spring is carried out in accordance with the provisions of GB1239.4. 4.5 Precision inspection
4.5.1 The fitting area is visually inspected by the coloring method. 2 The assembly clearance between the brake shoe and the brake lining is inspected with a cold ruler. 4.5.2
4.6 Rust prevention and surface coating inspection
4.6.1 Rust prevention inspection method:
The rust removal of each brake component before painting shall be inspected in accordance with the provisions of (B8923. 4.6.2
3 The adhesion of the paint film shall be inspected in accordance with the provisions of GB9286. 4.6.3
JB/T 7685.2--1995
4.6.4 The surface quality after painting shall be checked by visual inspection. 5 Inspection rules
5.1 Factory inspection
5.1.1 Each product shall be inspected by the quality inspection department in accordance with the provisions of this standard. It can be shipped only after passing the inspection and accompanied by a product certificate.
5.1.2 The inspection items are as follows:
Brake lubrication (Article 3.2.3);
Operation performance at 85% rated voltage (Article 3.3.1a); Assembly clearance between brake shoe and brake pad (Article 3.6.2); Surface rust prevention (Article 3.7.1);
Surface quality after painting (Article 3.7.2d). If any item of the inspected product fails to meet the standards, the product will be judged as unqualified. 5.1.3
5.2 Type inspection
5.2.1 Type inspection should be carried out in any of the following situations; a.
When a new product is finalized or an old product is transferred to another factory for trial production and appraisal; after the product is officially put into production, there are major changes in design and process that may affect product performance; when a product is resumed after a long-term suspension of more than two years; when the national quality supervision and inspection agency proposes a type inspection requirement: the product is normal During production, type inspection shall be conducted once every two years. The following sampling methods shall be used for type inspection:
The type inspection sampling methods for situations a and h in Article 5.2.1 are: among the trial products, two products of each specification shall be selected a.
The type inspection sampling methods for situations c and e in Article 5.2.1 are: among the products under production, one specification shall be selected from every two wheel diameters in the order of wheel diameter size, at least three specifications shall be selected from each series, and at least two products of each specification shall be selected; c. The type inspection sampling method for situation d in Article 5.2.1 shall be determined by the national quality management system. The quality supervision agency shall determine it by itself. 5.2.3 The inspection items are as follows:
Structural requirements (each item in 3.2);
Action performance (3.3.1);
Braking torque (3.3.2a);
Electromagnet performance (3.3.3);
Friction performance (3.3.4);
Precision requirements (each item in 3.6);
Surface rust prevention (3.7.1);
h. Surface coating (3.7.2).
Note: The type inspection items of electromagnets can also be in accordance with JB/T 6451, but the technical requirements for electromagnets shall comply with the provisions of this standard. 5.2.4 The judgment rules for type inspection are as follows: a. For the type inspection of cases a and b in 5.2.1, all the inspection items of each specification of the inspected products should be qualified. If there are unqualified items, it is allowed to double the products of the same batch and the same specification to re-inspect all items once. If there are still unqualified items, the products of this specification are judged to be unqualified; b. For the type inspection of cases c, d, and e in 5.2.1, all the inspection items of the inspected products should be qualified. If there are unqualified items, it is allowed to double the products of the same batch and the same specification to re-inspect all items once. If there are still unqualified items, the products of this batch are judged to be unqualified.
6 Marking, packaging, transportation and storage
JB/T7685.2—1995
Brakes should be equipped with product labels in obvious locations and marked with the following information: product name;
b. Product model;
Rated braking torque;
Complete machine weight;
Manufacturing date or factory number;
Manufacturing name.
6.2 Packaging
6.2.1 All products leaving the factory must be packaged, and the packaging should comply with the relevant provisions of GB/T13384; the packaging of export products should comply with the relevant provisions of export products.
Each product must be accompanied by the following documents:
Product certificate;
b. Product instruction manual;
Packing list when multiple products are packed
in one box.
6.3 Transportation and storage
During transportation or hoisting, the product is strictly prohibited from being inverted or bumped, and it should be prevented from being impacted. The product should be stored in a clean and ventilated place with a temperature between -25 and 40℃, which can prevent rain, snow and water from invading, and should not be exposed to the sun for a long time. 7 Product quality assurance period
The manufacturer should ensure that the supplied products can work normally for 6 months from the date of use (but not more than 18 months from the date of delivery) under the condition of proper storage and correct use by the user, otherwise the manufacturer should repair or replace it free of charge. Additional remarks:
This standard was proposed and managed by the Beijing Hoisting and Transportation Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Dalian Hoisting Machinery, and Tianshui Great Wall Control Electric Factory, Beijing Hoisting and Transportation Machinery Research Institute, Jiaozuo Brake Factory, Xiyang Hoisting Electric Factory, etc. participated in the drafting. The main drafters of this standard are Nie Chunhua, Liu Wusheng, Wang Zhendong, Cong Huari, Yin Jingli, and Ma Yuqi. GB6334-86 "DC Electromagnetic Block Brake" shall be invalidated from the date of implementation of this standard.3
JB/T 7685.2--1995
4.6.4 The surface quality after painting shall be checked by visual inspection. 5 Inspection rules
5.1 Factory inspection
5.1.1 Each product shall be inspected by the quality inspection department in accordance with the provisions of this standard. It can be shipped only after passing the inspection and accompanied by a product certificate.
5.1.2 The inspection items are as follows:
Brake lubrication (Article 3.2.3);
Operation performance at 85% rated voltage (Article 3.3.1a); Assembly clearance between brake shoe and brake pad (Article 3.6.2); Surface rust prevention (Article 3.7.1);
Surface quality after painting (Article 3.7.2d). If any item of the inspected product fails to meet the standards, the product shall be deemed unqualified. 5.1.3
5.2 Type inspection
5.2.1 Type inspection should be carried out in any of the following circumstances: a.
When a new product is finalized or an old product is transferred to another factory for trial production and appraisal; when there are major changes in the design and process after the formal production of the product, which may affect the product performance; when the product is resumed after a long-term suspension of more than two years; when the national quality supervision and inspection agency proposes a type inspection requirement: When the product is in normal production, type inspection should be carried out every two years. The following sampling methods are adopted for type inspection: The sampling methods for type inspection in cases a and h of Article 5.2.1 are: among the trial products, two products of each specification shall be selected. The sampling methods for type inspection in cases c and e of Article 5.2.1 are: among the products produced, one specification shall be selected from every two wheel diameters in the order of wheel diameter size, at least three specifications shall be selected from each series, and at least two products of each specification shall be selected; The sampling method for type inspection in case d of Article 5.2.1 shall be determined by the national quality supervision agency. 5.2.3 Inspection items are as follows:
Structural requirements (each item in 3.2);
Action performance (3.3.1);
Braking torque (3.3.2a);
Electromagnet performance (3.3.3);
Friction performance (3.3.4);
Precision requirements (each item in 3.6);
Surface rust prevention (3.7.1);
h. Surface coating (3.7.2).
Note: The type inspection items of electromagnets can also be carried out according to the provisions of JB/T 6451, but the technical requirements for electromagnets should comply with the provisions of this standard. 5.2.4 The judgment rules for type inspection are as follows
a. For the type inspection of the two cases a and b in 5.2.1, all the inspection items of each specification of the inspected products should be qualified. If there are unqualified items, it is allowed to double the samples of products of the same batch and specification to re-inspect all items once. If there are still unqualified items, the products of this specification are judged to be unqualified;
b. For the type inspection of the three situations c, d, and e in Article 5.2.1, the inspection items of the products sampled should all be qualified. If there are unqualified items, it is allowed to double the samples of products of the same batch and specification to re-inspect all items once. If there are still unqualified items, the batch of products is judged to be unqualified.
6 Marking, packaging, transportation and storage
JB/T7685.2—1995
The brake should be equipped with a product label in a conspicuous position and marked with the following content: product name;
b. Product model;
Rated braking torque;
Complete machine weight;
Manufacture date or factory number;
Manufacturer's name.
6.2 Packaging
6.2.1 All products leaving the factory must be packaged, and the packaging should comply with the relevant provisions of GB/T13384; the packaging of export products should comply with the relevant provisions of export commodities.
Each product must be accompanied by the following documents:
Product certificate;
b. Product instruction manual;
Packing list when multiple products are packed
in one box.
6.3 Transportation and storage
It is strictly forbidden to invert or bump the product during transportation or hoisting, and it must be prevented from being impacted. The product should be stored in a clean and ventilated place with a temperature between -25 and 40℃, and protected from rain, snow and water. It should not be exposed to the sun for a long time. 7. Product Quality Assurance Period
The manufacturer should ensure that the supplied products can work normally for 6 months (but not more than 18 months from the date of delivery) from the date of use under the condition of proper storage and correct use by the user. Otherwise, the manufacturer should repair or replace them free of charge. Additional Notes:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Dalian Hoisting Machinery, and Tianshui Great Wall Control Electric Appliance Factory, Beijing Hoisting and Conveying Machinery Research Institute, Jiaozuo Brake Factory, Xiyang Hoisting Electric Appliance Factory, etc. participated in the drafting. The main drafters of this standard are Nie Chunhua, Liu Wusheng, Wang Zhendong, Cong Huari, Yin Jingli, and Ma Yuqi. From the date of implementation of this standard, GB6334-86 "DC Electromagnet Block Brake" will be invalid. 1933
JB/T 7685.2--1995
4.6.4 The surface quality after painting shall be checked by visual inspection. 5 Inspection rules
5.1 Factory inspection
5.1.1 Each product shall be inspected by the quality inspection department in accordance with the provisions of this standard. It can be shipped only after passing the inspection and accompanied by a product certificate.
5.1.2 The inspection items are as follows:
Brake lubrication (Article 3.2.3);
Operation performance at 85% rated voltage (Article 3.3.1a); Assembly clearance between brake shoe and brake pad (Article 3.6.2); Surface rust prevention (Article 3.7.1);
Surface quality after painting (Article 3.7.2d). If any item of the inspected product fails to meet the standards, the product shall be deemed unqualified. 5.1.3www.bzxz.net
5.2 Type inspection
5.2.1 Type inspection should be carried out in any of the following circumstances: a.
When a new product is finalized or an old product is transferred to another factory for trial production and appraisal; when there are major changes in the design and process of a product after formal production, which may affect the product performance; when a product is resumed after a long-term suspension of more than two years; when the national quality supervision and inspection agency proposes a type inspection requirement: When the product is in normal production, a type inspection should be carried out every two years. The following sampling methods are adopted for type inspection: The sampling methods for type inspection in cases a and h of Article 5.2.1 are: among the trial products, two products of each specification shall be selected. The sampling methods for type inspection in cases c and e of Article 5.2.1 are: among the products produced, one specification shall be selected from every two wheel diameters in the order of wheel diameter size, at least three specifications shall be selected from each series, and at least two products of each specification shall be selected; The sampling method for type inspection in case d of Article 5.2.1 shall be determined by the national quality supervision agency. 5.2.3 Inspection items are as follows:
Structural requirements (each item in 3.2);
Action performance (3.3.1);
Braking torque (3.3.2a);
Electromagnet performance (3.3.3);
Friction performance (3.3.4);
Precision requirements (each item in 3.6);
Surface rust prevention (3.7.1);
h. Surface coating (3.7.2).
Note: The type inspection items of electromagnets can also be carried out according to the provisions of JB/T 6451, but the technical requirements for electromagnets should comply with the provisions of this standard. 5.2.4 The judgment rules for type inspection are as follows
a. For the type inspection of the two cases a and b in 5.2.1, all the inspection items of each specification of the inspected products should be qualified. If there are unqualified items, it is allowed to double the samples of products of the same batch and specification to re-inspect all items once. If there are still unqualified items, the products of this specification are judged to be unqualified;
b. For the type inspection of the three situations c, d, and e in Article 5.2.1, the inspection items of the products sampled should all be qualified. If there are unqualified items, it is allowed to double the samples of products of the same batch and specification to re-inspect all items once. If there are still unqualified items, the batch of products is judged to be unqualified.
6 Marking, packaging, transportation and storage
JB/T7685.2—1995
The brake should be equipped with a product label in a conspicuous position and marked with the following content: product name;
b. Product model;
Rated braking torque;
Complete machine weight;
Manufacture date or factory number;
Manufacturer's name.
6.2 Packaging
6.2.1 All products leaving the factory must be packaged, and the packaging should comply with the relevant provisions of GB/T13384; the packaging of export products should comply with the relevant provisions of export commodities.
Each product must be accompanied by the following documents:
Product certificate;
b. Product instruction manual;
Packing list when multiple products are packed
in one box.
6.3 Transportation and storage
It is strictly forbidden to invert or bump the product during transportation or hoisting, and it must be prevented from being impacted. The product should be stored in a clean and ventilated place with a temperature between -25 and 40℃, and protected from rain, snow and water. It should not be exposed to the sun for a long time. 7. Product Quality Assurance Period
The manufacturer should ensure that the supplied products can work normally for 6 months (but not more than 18 months from the date of delivery) from the date of use under the condition of proper storage and correct use by the user. Otherwise, the manufacturer should repair or replace them free of charge. Additional Notes:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Dalian Hoisting Machinery, and Tianshui Great Wall Control Electric Appliance Factory, Beijing Hoisting and Conveying Machinery Research Institute, Jiaozuo Brake Factory, Xiyang Hoisting Electric Appliance Factory, etc. participated in the drafting. The main drafters of this standard are Nie Chunhua, Liu Wusheng, Wang Zhendong, Cong Huari, Yin Jingli, and Ma Yuqi. From the date of implementation of this standard, GB6334-86 "DC Electromagnet Block Brake" will be invalid. 1931 All products leaving the factory must be packaged, and the packaging should comply with the relevant provisions of GB/T13384; the packaging of export products should comply with the relevant provisions of export commodities.
Each product must be accompanied by the following documents:
Product certificate;
b. Product instruction manual;
Packing list when multiple products are packed
in one box.
6.3 Transportation and storage
Products must not be inverted or bumped during transportation or hoisting, and they must be protected from impact. Products should be stored in a clean and ventilated place with a temperature between -25 and 40℃, which can prevent rain, snow and water from invading, and must not be exposed to the sun for a long time. 7 Product quality assurance period
The manufacturer should ensure that the products supplied can work normally for 6 months (but not more than 18 months from the date of delivery) from the date of use under the condition of proper storage and correct use by the user, otherwise the manufacturer should provide free repair or replacement. Additional Notes:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Dalian Hoisting Machinery, and Tianshui Great Wall Control Electric Appliance Factory, Beijing Hoisting and Conveying Machinery Research Institute, Jiaozuo Brake Factory, Xiyang Hoisting Electric Appliance Factory, etc. participated in the drafting. The main drafters of this standard are Nie Chunhua, Liu Wusheng, Wang Zhendong, Cong Huari, Yin Jingli, and Ma Yuqi. From the date of implementation of this standard, GB6334-86 "DC Electromagnetic Block Brake" will be invalid. 1931 All products leaving the factory must be packaged, and the packaging should comply with the relevant provisions of GB/T13384; the packaging of export products should comply with the relevant provisions of export commodities.
Each product must be accompanied by the following documents:
Product certificate;
b. Product instruction manual;
Packing list when multiple products are packed
in one box.
6.3 Transportation and storage
Products must not be inverted or bumped during transportation or hoisting, and they must be protected from impact. Products should be stored in a clean and ventilated place with a temperature between -25 and 40℃, which can prevent rain, snow and water from invading, and must not be exposed to the sun for a long time. 7 Product quality assurance period
The manufacturer should ensure that the supplied products can work normally for 6 months (but not more than 18 months from the date of delivery) from the date of use under the condition of proper storage and correct use by the user, otherwise the manufacturer should provide free repair or replacement. Additional Notes:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Dalian Hoisting Machinery, and Tianshui Great Wall Control Electric Appliance Factory, Beijing Hoisting and Conveying Machinery Research Institute, Jiaozuo Brake Factory, Xiyang Hoisting Electric Appliance Factory, etc. participated in the drafting. The main drafters of this standard are Nie Chunhua, Liu Wusheng, Wang Zhendong, Cong Huari, Yin Jingli, and Ma Yuqi. From the date of implementation of this standard, GB6334-86 "DC Electromagnetic Block Brake" will be invalid. 193
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