CN-121974090-A - Mining large-size vertical chain connecting ring, manufacturing method thereof, mining chain and scraper conveyor

CN121974090ACN 121974090 ACN121974090 ACN 121974090ACN-121974090-A

Abstract

A mining large-size vertical chain link, a manufacturing method thereof, a mining chain and a scraper conveyor adopt forging, rough machining, heat treatment, shot blasting, finish machining, stretching and surface strengthening processing technologies, so that the reliability and the service life of the chain link are improved. The chain connecting ring comprises a first semi-ring, a second semi-ring and two positioning pins, wherein the first semi-ring and the second semi-ring are combined to form an annular structure, two end parts of the first semi-ring are provided with a first pin hole and a second pin hole, two end parts of the second semi-ring are provided with a third pin hole and a fourth pin hole, the first pin hole and the fourth pin hole are concentric, the diameter of the fourth pin hole is larger than that of the first pin hole, the second pin hole and the third pin hole are concentric, the diameter of the second pin hole is larger than that of the third pin hole, the positioning pins are inserted along the fourth pin hole and the first pin hole correspondingly, and the first semi-ring and the second semi-ring are fixed through the insertion along the second pin hole and the third pin hole. The first semi-ring and the second semi-ring adopt mortise-tenon matching to realize boss and groove installation, and firm connection of the chain connecting ring is ensured.

Inventors

CHEN BING
LI ZONGTAO
MA BIN
TIAN GUOZHU
GAO FENGQIN
REN YUAN
WU ZIRONG
YUAN XUEWEI
XU JIAKAI
DING YURONG
YANG QING

Assignees

宁夏天地奔牛链条有限公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (7)

1. A manufacturing method of a mining large-size vertical chain connector is characterized by comprising the following steps, Step S1, forging a blank in a die forging mode; step S2, rough machining is carried out by utilizing cutter compensation according to the size of the product, and the rough machining allowance is 0.2mm; step S3, quenching-tempering heat treatment is carried out on the assembled chain links so that the deformation generated by the heat treatment is absorbed by reserved machining allowance; Wherein the heat treatment is performed as follows, S31, horizontally placing the assembled chain links in a furnace, wherein a gap is reserved between each two chain links; S32, feeding the heating furnace into a workpiece when the furnace temperature is increased to 600 ℃, starting to keep the temperature when the furnace temperature is increased to 600 ℃ again, keeping the temperature for 145-155 min, and keeping the temperature for 175-185 min when the furnace temperature is increased to 890 ℃; s33, taking out the workpiece and putting the workpiece into a quenching tank for quenching; S34, feeding the quenched workpiece when the furnace temperature of the tempering furnace is increased to 400 ℃, and keeping the temperature for 295-305 min when the furnace temperature is increased to 400 ℃ again; s35, performing air cooling on the tempered workpiece, wherein the air cooling time is more than or equal to 5min; S4, taking out the thermally treated chain links, and removing oxide scales and internal tissue stress by shot blasting after the chain links are cooled to a proper condition; step S5, according to the size of the product, the cutter is used for compensation and finish machining, the fit clearance between the raised head and the groove is 0.05mm, the pin hole is finish machined, the influence of heat treatment deformation on the fit surface is avoided, meanwhile, the surface finish is good, and the interference of oxide skin is avoided; s6, assembling the first semi-ring and the second semi-ring into a chain connecting ring for stretching; and S7, performing surface shot peening, wherein the shot peening strength is 0.2.
2. The method for manufacturing the mining large-size vertical chain link according to claim 1, wherein in the step S33, the water temperature of the quenching tank is 22-24 ℃, the quenching time is 5min, and the water temperature of the workpiece after water is added is 24-30 ℃.
3. The mining large-size vertical chain link manufactured by the manufacturing method of the mining large-size vertical chain link according to any one of claims 1-2 is characterized by comprising a first semi-ring, a second semi-ring and two positioning pins, wherein two ends of the first semi-ring and the second semi-ring can be abutted to enable the first semi-ring and the second semi-ring to form a ring structure, the two ends of the first semi-ring are provided with a first pin hole and a second pin hole, the two ends of the second semi-ring are provided with a third pin hole and a fourth pin hole, the first pin hole and the fourth pin hole are coaxial and concentric, the diameter of the fourth pin hole is larger than that of the first pin hole, the diameter of the second pin hole is coaxial and concentric with that of the third pin hole, the two positioning pins are inserted along the fourth pin hole and the first pin hole, the third pin hole are inserted, the first semi-ring and the second semi-ring are fixed, the positioning pins and the second pin hole and the fourth pin hole have gaps, and the first semi-ring and the second semi-ring have certain displacement when the chain link is pulled by the two ends.
4. The mining large-size vertical chain link according to claim 3, wherein the first pin hole and the second pin hole are arranged along the longitudinal direction of the first half ring, the third pin hole and the fourth pin hole are arranged along the longitudinal direction of the second half ring, and the positioning pin is in threaded connection with the first pin hole and the third pin hole.
5. The mining large-size vertical chain link according to claim 3, wherein the first pin hole and the second pin hole are arranged along the transverse direction of the first semi-ring, the third pin hole and the fourth pin hole are arranged along the transverse direction of the second semi-ring, and the positioning pin is in threaded connection with the first pin hole and the third pin hole.
6. A mining chain is characterized by comprising the mining large-size vertical chain link disclosed in claim 5.
7. A scraper conveyor, which is characterized by comprising the mining chain as claimed in claim 6.

Description

Mining large-size vertical chain connecting ring, manufacturing method thereof, mining chain and scraper conveyor Technical Field The invention relates to the technical field of mining chain links, in particular to a mining large-size vertical chain link, a manufacturing method thereof, a mining chain and a scraper conveyor. Background At present, the connection of high strength round-link chain on the domestic coal mine worker exploitation conveying equipment, the partly chain link that adopts is by the structure that application number CN201220577062.5, name "a novel vertical ring chain link" disclose, though this prior art has the fracture strength that improves the chain link, avoids the chain knot, increases the life of chain link, increases the reliability of chain link. Because the prior art comprises the upper half ring 1, the lower half ring 2 and the positioning pins 3 for connecting the upper half ring 1 and the lower half ring 2 into a whole, the two ends of the upper half ring 1 and the lower half ring 2 are connected through mortise-tenon fit, specifically, the two ends of the upper half ring 1 are respectively provided with tenons and mortise, and the two ends of the lower half ring 2 are respectively provided with corresponding mortise and tenon. The middle of the upper half ring 1 and the lower half ring 2 are lapped together through concave-convex fit, in particular to a boss and a groove are arranged in the middle of the upper half ring 1, and a corresponding groove and a boss are arranged in the middle of the lower half ring 2. In addition, the middle concave-convex fit lap joint parts on the upper half ring 1 and the lower half ring 2 are provided with pin holes, the pin holes are provided with positioning pins 3, the positioning pins 3 are arranged in the pin holes in an interference fit mode, in order to ensure that the upper half ring 1 and the lower half ring 2 are firmly connected, the interference fit degree requirement is higher, if the chain connecting ring is horizontally arranged, the positioning pins 3 can be smashed into the pin holes, but the practical installation environment is that the chain connecting ring can only be vertically arranged in the scraper groove, and then the positioning pins are pressed into the pin holes by adopting special tools. However, under the severe working conditions of narrow underground and high load, the locating pin 3 is blocked due to dirt adhesion, so that the installation and the disassembly are time-consuming and labor-consuming, and the operation efficiency and the maintenance safety of the equipment are directly affected. Secondly, the performance of the existing product is designed according to the standards of MT/T99-1997 and the like, and the breaking load and the fatigue life (for example, the common requirement in the industry is that the breaking load is more than or equal to 2630kN and the fatigue frequency is more than or equal to 40000 times) of the existing product are difficult to completely meet the limit load requirement of the heavy scraper conveyor with the current large mining height and the ultra-long working surface on the driving chain ring connecting piece. Insufficient performance can easily cause the chain links to become weak links in the chain system, causing unintended shutdowns. Disclosure of Invention In order to solve the technical problems in the prior art, it is necessary to provide a mining large-sized vertical chain link. A method for manufacturing a mining large-size vertical chain connector comprises the following steps, Step S1, forging a blank in a die forging mode; step S2, rough machining is carried out by utilizing cutter compensation according to the size of the product, and the rough machining allowance is 0.2mm; S3, leveling the assembled chain links, and performing quenching-tempering heat treatment; S4, taking out the thermally treated chain links, and removing oxide scales and internal tissue stress by shot blasting after the chain links are cooled to a proper condition; S5, carrying out finish machining by utilizing cutter compensation according to the size of the product, wherein the fit clearance between the raised head and the groove is 0.05mm, and finishing a pin hole; s6, assembling the first semi-ring and the second semi-ring into a chain connecting ring for stretching; and S7, performing surface shot peening, wherein the shot peening strength is 0.2. Preferably, in step S3, the heat treatment is performed as follows, S31, horizontally placing the assembled chain links in a furnace, wherein a gap is reserved between each two chain links; S32, feeding the heating furnace into a workpiece when the furnace temperature is increased to 600 ℃, starting to keep the temperature when the furnace temperature is increased to 600 ℃ again, keeping the temperature for 145-155 min, and keeping the temperature for 175-185 min when the furnace temperature is increased to 890 ℃; s33, taking out the work