This standard specifies the technical requirements, test methods, inspection rules and marking, packaging and storage of wedge-shaped connection devices for vertical shaft lifting containers. This standard applies to single-sided wedging and double-sided wedging wedge-shaped connection devices (hereinafter referred to as connection devices). MT 284-1994 Technical conditions for wedge-shaped connection devices for vertical shaft lifting containers MT284-1994 Standard download decompression password: www.bzxz.net

Coal Industry Standard of the People's Republic of ChinawwW.bzxz.Net
Technical Conditions for Shaft Hoisting Container Moulded Connection Devices 1 Subject Content and Scope of Application
MT 284—94
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging and storage of wedge-shaped connection devices for shaft hoisting containers. This standard applies to single-sided wedging and double-sided wedging wedge-shaped connection devices (hereinafter referred to as connection devices). 2 Reference Standards
GB228 Metal Tensile Test Method
GB229 Metal Charpy (U-Notch) Impact Test Method GB2975 Sampling Regulations for Mechanical and Process Performance Tests of Steel ZBJ04005 Penetrant Flaw Detection Method
ZBJ04006 Magnetic Particle Flaw Detection Method for Iron and Steel Materials JB3963 Ultrasonic Flaw Detection of Pressure Vessel Forgings 3 Technical Requirements
3.1 The connection device shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 3.2 The materials of the main load-bearing parts (side plates, wedge backs or clamps, pins, connecting plates) should have a certificate of conformity and can only be used after passing the re-inspection. 3.3 Parts should be inspected and qualified; purchased parts and outsourced parts should have a certificate of conformity and can only be assembled and used after passing the inspection. 3.4 The main load-bearing parts should be made of whole forged or rolled steel plates. 3.5 There should be no cracks, scars, folds, inclusions, scratches and rust visible to the naked eye on the surface of the parts. 3.6 Bolt connections should have anti-loosening measures.
3.7 Bolts, nuts and other fixings should be galvanized (or flanged). The outer surface of the connecting device should be painted with anti-rust paint. 3.8 Before installing the rope, the wedge should move flexibly in the wedge sleeve. 3.9 The hinge connection should rotate flexibly.
3:10 The mechanical properties of the main load-bearing material should meet the following requirements: ≥15%, ≥40%, α≥0.5MJ/m. 3.11 The main bearing parts shall be inspected by ultrasonic testing and magnetic particle testing (or penetrant testing). The inspection results shall meet the following requirements in the stress area of ​​the parts:
a. Ultrasonic testing: Single defects, bottom wave reduction and dense area defects shall not exceed the requirements of Class I defects in JB3963; b. Magnetic particle testing: The magnetic traces of linear defects and circular defects shall not exceed the requirements of Class 1 defects in 2BJ04006. The magnetic traces of scattered defects shall not exceed the requirements of Class 2 defects.
Penetrant testing: The display traces of linear defects and circular defects shall not exceed the requirements of Class 1 defects in ZBJ04005. The traces of scattered defects shall not exceed the requirements of Class 2 defects. 3.12 After assembly, the distance between the rope groove of the wedge back (or clamp iron) and the rope groove of the wedge shall not differ by more than 3.5% of the diameter of the wire rope. If the requirements are not met, trimming is allowed. However, the strength of the parts shall not be affected. 3.13 The connection device shall ensure that the steel wire rope of the applicable diameter is connected reliably and shall not slide. 3.14 The connection device shall be subjected to static load test. The test results show that the parts shall have no permanent deformation and cracks, and the steel wire rope shall not slide. Approved by the Ministry of Energy of the People's Republic of China on May 1, 1992 and implemented on October 1, 1994
MT 284-94
3.15 The safety factor of the connection device (including the pin and the connecting plate) shall comply with the relevant provisions of the current "Safety Regulations for Coal Mines". 3.16 There shall be a device that can wedge the wedge and prevent the wedge from automatically loosening. 3.17 For the newly designed connection device, there shall be elastic shock-absorbing measures at the rope entry to reduce wire breakage. 4 Test methods
4.1 Test instruments and equipment
Material testing machine: accuracy should not be less than 1%; a.
Dynamometer: graduation value should not be greater than 8kN;
Steel ruler or steel tape measure: graduation value should not be greater than 1mm, c.
Vernier caliper: graduation value should not be greater than 0.05mm. d.
4.2 Visually check the requirements of 3.5~~3.7. 4.3 Check whether the wedge moves flexibly in the wedge sleeve by hand and whether the hinge connection rotates flexibly. 4.4 Mechanical property tests of materials shall be carried out in accordance with the following standards: a. Tensile test shall be carried out in accordance with GB228;
b. Impact test shall be carried out in accordance with GB229.
4.5 Ultrasonic flaw detection is carried out in accordance with JB3963; penetrant flaw detection is carried out in accordance with ZBJ04005; magnetic particle flaw detection is carried out in accordance with ZBJ04006. 4.6 Insert the inspection rod with the same diameter as the applicable wire rope into the rope groove on the main rope side, and close the wedge. Use the inner caliper to measure the distance between the wedge back (or iron clamp) rope groove and the wedge rope groove at both ends of the auxiliary rope side, and calculate the ratio of the difference between the two distance dimensions and the maximum applicable wire rope diameter. 4.7 The static load test of the connecting device should be carried out on a material testing machine or a special test device. First, pre-apply a load not greater than the allowable working load to straighten the wire rope, and make an inspection mark on the free end of the wire rope. Then load step by step, each level not exceeding 100kN, and after reaching the test load (3 times the allowable working load), maintain the load for 30 minutes. Check whether the wire rope has slipped. After unloading the load, check whether the parts have permanent deformation and cracking.
The test should be carried out under the condition that the wire rope or rope groove is oiled. 4.8 The connection reliability test of the connection device should be carried out on a material testing machine or a special test device. The wire rope with the largest applicable diameter should be used. After preloading and making inspection marks, load until the wire rope breaks. Check whether the wire rope has slipped and whether the parts of the connection device are damaged.
The test should be carried out under the condition that the wire rope or rope groove is oiled. 5 Inspection rules
5.1 Factory inspection
5.1.1 Before leaving the factory, the quality inspection department of the manufacturer shall inspect each unit. Only after passing the inspection and issuing the certificate can it leave the factory. 5.1.2 The factory inspection items shall be carried out in accordance with Articles 3.4~3.9, 3.11, 3.12, and 3.14 of this standard. Among them, Articles 3.12 and 3.14 are random inspection items, and their sampling and judgment are shown in Articles 5.3.1 and 5.3.3. 5.2 Type inspection
5.2.1 Type inspection shall be conducted in any of the following cases: trial production and identification of new products or old products transferred to the factory for production, a.
once every three years for products in normal production, b.
when production is resumed after a two-year suspension,
when there are major changes in structure, materials, and processes after formal production, which may affect product performance, d.
when there is a major difference between the factory inspection results and the last type inspection, e.
when the national quality supervision agency proposes a type inspection requirement. f.
5.2.2 Type inspection shall be the responsibility of the coal mine safety product quality supervision and inspection test center designated by the state. After the product passes the inspection, an industrial test certificate or product certificate shall be issued.
MT 284—94
5.2.3 Type inspection shall be conducted in accordance with Articles 3.5 to 3.14 of this standard. 5.3 Sampling and judgment rules
5.3.1 1% (at least 2 units) of each batch of connection devices shall be sampled for static load test. If one unit fails, the batch of connection devices shall be unqualified.
5.3.2 One unit of each specification of connection devices shall be sampled (can be sampled from the products that have passed the static load test) for connection reliability test. If it fails, the connection device of this specification shall be unqualified. 5.3.3 At least 2 units of each batch of connection devices shall be sampled for the inspection of Article 3.12. If one unit fails, each unit shall be inspected. It is allowed to re-inspect the parts after trimming. If it still fails, the unit shall be unqualified. 5.3.4 If the inspection of Articles 3.5 to 3.9 does not meet the requirements, it is allowed to be processed and re-inspected. If it fails again, the item shall be unqualified. 5.3.5 If the flaw detection inspection of the main load-bearing parts fails, the part shall be unqualified. 5.3.6 Use the same batch of materials, the same cross-sectional dimensions, and the same furnace heat treatment for the initial processing rough pieces. Sampling shall be carried out according to GB2975. The tensile test specimens and impact test specimens shall be no less than 2 each. If one fails, the number shall be doubled for retesting. If another fails, the mechanical properties of the batch of materials shall be deemed unqualified.
6 Marking, packaging, and storage
6.1 Each connection device shall be fixed with a nameplate in a conspicuous place, and the following contents shall be indicated: a. Product model and name;
Main technical parameters: Applicable wire rope nominal diameter, breaking load, allowable working load (for lifting people and objects); b.
Factory number and date;
Manufacturer's name.
6.2 The connection device shall be packaged and bundled.
6.3 The connection device shall be stored in a dry and well-ventilated warehouse. The processed surface shall be oiled. Additional Notes:
This standard was proposed by the China Coal Research Institute. This standard was drafted by the Fushun Branch of the China Coal Research Institute. The main drafters of this standard were Yang Yungong and Dai Tangwu. This standard was entrusted to the Fushun Branch of the China Coal Research Institute for interpretation.
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