A flat link chain for mining

Abstract

The utility model relates to a kind of mine flat type link ring, including link ring body, clamping block and bolt assembly, link ring body includes two half rings, each is opened with a clamping groove in the opposite position of the two sides of clamping block, the inside wall of link ring body is formed with the limiting protrusion corresponding to each clamping groove outwardly extending, clamping block is set in the inside of link ring body, each limiting protrusion is inserted in corresponding clamping groove;Bolt assembly includes outer thread rod and inner thread rod, link ring body and clamping block are cooperatively opened with a through hole, the through hole is inserted into through hole from the both ends of through hole, and is mutually screwed;The utility model's mine flat type link ring is not only easy to install, but also only needs to be opened with through hole on link ring body and clamping block, and processing technology is simple, the fatigue strength of link ring whole is guaranteed, and in use process, if thread occurs corrosion and wear, only need to replace bolt assembly, it is convenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of mining chain technology, and in particular to a flat connecting link for mining. Background Technology

[0002] As an essential component in mining machinery and equipment, the flat-type chain link is characterized by its quick and stable connection. The flat-type chain link is mostly made by splicing two half-chain links together.

[0003] Chinese utility model patent CN213598508U discloses a mining flat connecting ring with an embedded RFID electronic tag. This flat connecting ring includes a first half-ring, a second half-ring, a locking bolt, and a limiting block. One end of the first half-ring has a first horseshoe-shaped connecting block, and the other end has a first connecting entity. The first connecting entity has a first connecting groove, and its upper surface has a first limiting block with a first threaded hole. The threaded hole passes obliquely through the first limiting block and the interior of the first connecting entity at a 75° angle horizontally, and exits from the lower surface of the first connecting entity. This mining flat connecting ring achieves rapid connection of the two half-rings by threading the locking bolt into the through threaded hole.

[0004] The aforementioned flat-type chain link for mining still has the following defects: As a critical stress-bearing component, the half-ring of the connecting link has internal threads machined on the inner wall of the through hole. This not only disrupts the fiber continuity of the material and reduces the overall fatigue strength of the connecting link, but also makes the machining process cumbersome. Flat-type chain links are used in harsh machine environments, and the internal threads of the bolts and threaded holes are prone to corrosion and wear. Once the internal threads of the threaded holes are damaged, the entire chain link is almost scrapped, or the threads need to be repaired in a time-consuming and laborious manner, resulting in poor maintainability.

[0005] Therefore, this utility model proposes a flat connecting chain ring for mining to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a mining flat-type connecting chain link that is easy to install, has high fatigue strength, and is easy to maintain.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is: a flat connecting link for mining, the innovation of which lies in: including The connecting ring body includes two half-rings. One end of each half-ring has a hoof-shaped connecting block, and the other end has a connecting seat. The inner sidewall of the connecting seat has a slot that matches the hoof-shaped connecting block. The two half-rings are symmetrically arranged about the central axis of the connecting ring body. The hoof-shaped connecting block of each half-ring is movably inserted into the slot of the connecting seat of the other half-ring. The two half-rings cooperate to form a U-shaped structure. The locking block has a symmetrical structure about the central axis of the connecting ring body. There is a locking groove at the opposite position on both sides of the locking block. Limiting protrusions that extend outward on the inner sidewall of the connecting ring body correspond to each locking groove. The locking block is set inside the connecting ring body, and each limiting protrusion is inserted into the corresponding locking groove. A bolt assembly, comprising an external threaded rod and an internal threaded rod, wherein a through hole is provided on the connecting ring body and the locking block, penetrating the two half-rings and the locking block; the external threaded rod and the internal threaded rod are respectively inserted into the through hole from both ends of the through hole and are threadedly connected to each other to achieve relative fixation between the two half-rings and the locking block.

[0008] Furthermore, the externally threaded rod includes an integrally formed first head and a first rod body. The first head is coaxially connected to one end of the first rod body. The first rod body, from the side closest to the first head, is sequentially provided with a first cylindrical segment, a first conical segment, a second cylindrical segment, a second conical segment, and an externally threaded segment. The outer diameter of the second cylindrical segment is smaller than the outer diameter of the first cylindrical segment. The end of the first conical segment connected to the first cylindrical segment is the first end, and the other end is the second end. The outer diameter of the first end is the same as the outer diameter of the first cylindrical segment, and the outer diameter of the second end is the same as the outer diameter of the second cylindrical segment. The outer diameter of the externally threaded segment is smaller than the outer diameter of the second cylindrical segment. The end of the second conical segment connected to the second cylindrical segment is the third end, and the other end is the fourth end. The outer diameter of the third end is the same as the outer diameter of the second cylindrical segment, and the outer diameter of the fourth end is the same as the outer diameter of the externally threaded segment. The first conical segment, the second cylindrical segment, and the second conical segment cooperate to form a stepped structure. The internally threaded rod includes an integrally formed second head and a second rod body. The second head is coaxially connected to one end of the second rod body. The outer diameter of the second rod body is the same as the outer diameter of the first cylindrical section. A connecting groove is opened on the end face of the second rod body away from the second head. An internal thread matching the external thread of the external thread section is opened on the inner wall of the connecting groove. A stepped groove matching the stepped structure is opened on the inner wall of the connecting groove away from the second head.

[0009] Furthermore, the connecting groove of the internal threaded rod has a guide post in the middle of its bottom surface. The guide post is coaxially arranged with the internal threaded rod. The external threaded section of the external threaded rod has a guide groove that matches the guide post. When the external threaded section of the external threaded rod extends into the connecting groove of the internal threaded rod for threaded connection, the guide post extends into the guide groove.

[0010] Furthermore, the end of the guide post has a third tapered section, one end of the third tapered section connected to the guide post is the fifth end, and the other end is the sixth end. The outer diameter of the fifth end is the same as the outer diameter of the guide post, and the outer diameter of the sixth end is smaller than the outer diameter of the fifth end.

[0011] Furthermore, a spring is provided in the connecting groove of the internally threaded rod, and the spring is fitted on the outside of the guide post.

[0012] Furthermore, one end of the spring is fixedly connected to the bottom surface of the connecting groove, and the axial height of the spring in its free state is less than the axial height of the guide post.

[0013] Furthermore, the slot is a dovetail groove.

[0014] The advantages of this utility model are: This utility model of a mining flat connecting ring utilizes the threaded connection of the external and internal threaded rods of the bolt assembly to achieve relative fixation between the two half-rings of the connecting ring body and the locking block. It is not only easy to install, but also only requires through holes to be made on the connecting ring body and the locking block, simplifying the processing technology and ensuring the overall fatigue strength of the connecting ring. Furthermore, if the threads rust or wear during use, only the bolt assembly needs to be replaced, making maintenance convenient.

[0015] The external thread of the external threaded rod and the internal thread of the internal threaded rod of this utility model are subjected to uniform tensile stress only. The stepped structure of the external threaded rod and the stepped groove of the internal threaded rod fit tightly together, achieving high-precision coaxial positioning. Under strong vibration, the huge stepped mating surface provides strong friction. The radial force and bending moment generated by vibration are absorbed by the stepped structure, improving the threaded connection's resistance to loosening. In addition, when the external threaded rod is inserted into the connecting groove of the internal threaded rod, the two inclined surfaces of the stepped groove and the first and second tapered sections can provide secondary guidance for the end of the external threaded rod, allowing the external threaded rod to smoothly enter the connecting groove.

[0016] When the internal threaded rod of this invention is threaded to the external threaded rod, the guide post and guide groove closely cooperate to radially limit the movement of the external threaded rod and the internal threaded rod, eliminating the small radial wobble gap between the internal threaded rod and the external threaded rod. In a vibration environment, it can effectively suppress fretting wear caused by the gap, thereby maintaining the long-term stability of the connection.

[0017] This invention provides a third tapered section at the end of the guide post. The inclined curved surface of the third tapered section can guide the external threaded rod, thereby allowing the guide post to enter the guide groove of the external threaded rod more smoothly.

[0018] This invention provides a spring within the connecting groove of the internally threaded rod to continuously apply a clamping force to the externally threaded rod, preventing axial loosening and fretting wear caused by vibration.

[0019] In this invention, the axial height of the spring in its free state is less than the axial height of the guide post. During the compression process, the spring is guided by the guide post, so that it only undergoes axial deformation, effectively preventing the external thread rod from causing radial displacement of the spring when compressing it.

[0020] The slot of this utility model adopts a dovetail groove design, which closely cooperates with the limiting protrusion to form a mechanical self-locking mechanism. Even if the bolt assembly breaks and fails, as long as the limiting protrusion of the locking block does not disengage from the slot, the two half rings of the connecting ring body cannot be separated. The inclined contact surface of the dovetail groove and the limiting protrusion itself has a large friction force, making it difficult for the limiting protrusion to disengage, thus improving the safety of the flat connecting ring. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of the mining flat connecting chain of this utility model.

[0023] Figure 2 This is a schematic diagram of the semi-ring structure of this utility model.

[0024] Figure 3 This is a schematic diagram of the card block of this utility model.

[0025] Figure 4 This is a front view of the mining flat connecting chain link of this utility model.

[0026] Figure 5 This is a cross-sectional view of the mining flat connecting chain link of this utility model along the AA direction.

[0027] Figure 6 This is a cross-sectional view of the external threaded rod of this utility model.

[0028] Figure 7 This is a cross-sectional view of the internally threaded rod of this utility model. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0030] Example This embodiment provides a flat connecting link for mining, such as... Figure 1-7As shown, it includes a connecting ring body 1, a locking block 2, and a bolt assembly 3.

[0031] The connecting ring body 1 includes two half-rings 11. One end of each half-ring 11 has a hoof-shaped connecting block 13, and the other end has a connecting seat 12. The inner side wall of the connecting seat 12 has a slot 121 that matches the hoof-shaped connecting block 13. The two half-rings 11 are symmetrically arranged about the central axis of the connecting ring body 1. The hoof-shaped connecting block 13 of each half-ring 11 is movably inserted into the slot of the connecting seat of the other half-ring. The two half-rings 11 cooperate to form a U-shaped structure.

[0032] The locking block 2 has a symmetrical structure about the central axis of the connecting ring body 1. A slot 21 is formed at a relative position on each side of the locking block 2. Limiting protrusions 122 extend outward from the inner wall of the connecting ring body 1, corresponding to each slot. The locking block 122 is located inside the connecting ring body 1, and each limiting protrusion 122 is inserted into its corresponding slot 21. In this embodiment, the slot 21 is a dovetail groove. The dovetail groove and the limiting protrusion fit tightly together to form a mechanical self-locking mechanism. Even if the bolt assembly breaks, as long as the limiting protrusion of the locking block does not disengage from the slot, the two halves of the connecting ring body cannot separate. Furthermore, the inclined contact surface between the dovetail groove and the limiting protrusion itself has a large frictional force, making it difficult for the limiting protrusion to disengage, thus improving the safety of the flat connecting ring.

[0033] The bolt assembly 3 includes an external threaded rod 31 and an internal threaded rod 32. The connecting ring body 1 and the locking block 2 are fitted with a through hole that passes through the two half rings 12 and the locking block 2. The external threaded rod 31 and the internal threaded rod 32 are inserted into the through hole from both ends of the through hole and are threaded to each other to achieve relative fixation between the two half rings 11 and the locking block 2.

[0034] In this embodiment, the externally threaded rod 31 includes an integrally formed first head 311 and a first rod body. The first head 311 is coaxially connected to one end of the first rod body. The first rod body, from the side closest to the first head 311, is sequentially provided with a first cylindrical section 312, a first tapered section 313, a second cylindrical section 314, a second tapered section 315, and an externally threaded section 316. The outer diameter of the first cylindrical section 312 is smaller than the outer diameter of the first head 311, and the outer diameter of the through hole matches the outer diameter of the first cylindrical section 312. The outer diameter of the second cylindrical section 314 is smaller than the outer diameter of the first cylindrical section 312. The outer diameter of the first tapered section 313 matches the outer diameter of the first cylindrical section 314. The end connected to 312 is the first end, and the other end is the second end. The outer diameter of the first end is the same as the outer diameter of the first cylindrical segment 312, and the outer diameter of the second end is the same as the outer diameter of the second cylindrical segment 314. The outer diameter of the external thread segment 316 is smaller than the outer diameter of the second cylindrical segment 314. The end of the second tapered segment 315 connected to the second cylindrical segment 314 is the third end, and the other end is the fourth segment. The outer diameter of the third end is the same as the outer diameter of the second cylindrical segment 314, and the outer diameter of the fourth end is the same as the outer diameter of the external thread segment 316. The first tapered segment 313, the second cylindrical segment 314, and the second tapered segment 315 cooperate to form a stepped structure.

[0035] The internally threaded rod 32 includes an integrally formed second head 321 and a second rod body 322. The second head 321 is coaxially connected to one end of the second rod body 322. The outer diameter of the second rod body 322 is the same as the outer diameter of the first cylindrical section 312. The outer diameter of the second head 321 is larger than the outer diameter of the second rod body 322. A connecting groove is formed on the end face of the second rod body 322 away from the second head 321. An internal thread matching the external thread of the external thread section 316 is formed on the inner wall of the connecting groove. A stepped groove 325 matching the stepped structure is formed on the side of the internal thread away from the second head 321 on the inner wall of the connecting groove.

[0036] When the external thread rod 31 and the internal thread rod 32 are connected by threads, the external thread of the external thread section 316 of the external thread rod 31 and the internal thread of the internal thread rod 32 are subjected to only uniform tensile stress. The stepped structure of the external thread rod 31 and the stepped groove 325 of the internal thread rod 32 are tightly fitted together, achieving high-precision coaxial positioning. Under strong vibration, the huge stepped mating surface provides strong friction. The radial force and bending moment generated by vibration are absorbed by the stepped structure, improving the threaded connection's resistance to loosening. In addition, when the external thread rod 31 is inserted into the connecting groove of the internal thread rod 32, the two inclined surfaces of the stepped groove 325 and the first tapered section 313 and the second tapered section 315 can provide secondary guidance for the end of the external thread rod 31, allowing the external thread rod 31 to smoothly enter the connecting groove.

[0037] In this embodiment, the internal thread rod 32 has a guide post 323 at the center of the bottom surface of the connecting groove. The guide post 323 is coaxially arranged with the internal thread rod 32. The external thread section 316 of the external thread rod 31 has a guide groove 317 matching the guide post 323 on its end face. The end of the guide post 323 has a third tapered section 324. One end of the third tapered section 324 connected to the guide post 323 is the fifth end, and the other end is the sixth end. The outer diameter of the fifth end is the same as the outer diameter of the guide post 323, and the outer diameter of the sixth end is smaller than the outer diameter of the fifth end. When the external thread section 316 of the external thread rod 31 extends into the connecting groove of the internal thread rod 32 for threaded connection, the guide post 323 extends into the guide groove 317, and the inclined curved surface of the third tapered section 324 can provide guidance for the external thread rod 31, thereby allowing the guide post 323 to enter the guide groove of the external thread rod 31 more smoothly. The tight fit between the guide post 323 and the guide groove 317 provides radial restraint for the external thread rod 31 and the internal thread rod 32, eliminating the small radial wobble gap between the internal thread rod 32 and the external thread rod 31. In a vibration environment, this can effectively suppress fretting wear caused by the gap, thereby maintaining the long-term stability of the connection.

[0038] In this embodiment, a spring 4 is provided in the connecting groove of the internal threaded rod 32. The spring 4 is fitted on the outside of the guide post 323, and one end of the spring 4 is fixedly connected to the bottom surface of the connecting groove. The axial height of the spring in its free state is less than the axial height of the guide post. When the external threaded rod 31 is rotated, during the threaded connection between the external threaded section of the external threaded rod 31 and the internal threaded rod 32, the other end of the spring is pressed against the end face of the external threaded section 316 of the external threaded rod 31. As the external threaded section 316 moves axially, it gradually compresses the spring 4. During the compression process, the spring 4 is guided by the guide post 323, so that it only undergoes axial deformation, effectively preventing the external threaded rod 31 from radially offsetting the spring 4 when compressing it. After the external threaded rod 31 is tightened, the spring 4 continuously applies a clamping force to the external threaded rod 31 to prevent the external threaded rod 31 from loosening axially due to vibration and causing fretting wear.

[0039] The mining flat-type connecting ring utilizes the threaded connection of the external threaded rod 31 and the internal threaded rod 32 of the bolt assembly to achieve relative fixation between the two half-rings 11 of the connecting ring body 1 and the locking block 2. This not only facilitates installation but also simplifies the manufacturing process by requiring only through holes to be made in the connecting ring body 1 and the locking block 2. It ensures the overall fatigue strength of the connecting ring and, if the threads corrode or wear during use, only the bolt assembly 3 needs to be replaced, making maintenance convenient.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A flat-type connecting link for mining, characterized in that: include The connecting ring body includes two half-rings. One end of each half-ring has a hoof-shaped connecting block, and the other end has a connecting seat. The inner sidewall of the connecting seat has a slot that matches the hoof-shaped connecting block. The two half-rings are symmetrically arranged about the central axis of the connecting ring body. The hoof-shaped connecting block of each half-ring is movably inserted into the slot of the connecting seat of the other half-ring. The two half-rings cooperate to form a U-shaped structure. The locking block has a symmetrical structure about the central axis of the connecting ring body. There is a locking groove at the opposite position on both sides of the locking block. Limiting protrusions that extend outward on the inner sidewall of the connecting ring body correspond to each locking groove. The locking block is set inside the connecting ring body, and each limiting protrusion is inserted into the corresponding locking groove. A bolt assembly, comprising an external threaded rod and an internal threaded rod, wherein a through hole is provided on the connecting ring body and the locking block, penetrating the two half-rings and the locking block; the external threaded rod and the internal threaded rod are respectively inserted into the through hole from both ends of the through hole and are threadedly connected to each other to achieve relative fixation between the two half-rings and the locking block.

2. The mining flat-type connecting link according to claim 1, characterized in that: The threaded rod includes an integrally formed first head and a first rod body. The first head is coaxially connected to one end of the first rod body. The first rod body, from the side closest to the first head, is sequentially provided with a first cylindrical segment, a first tapered segment, a second cylindrical segment, a second tapered segment, and an externally threaded segment. The outer diameter of the second cylindrical segment is smaller than the outer diameter of the first cylindrical segment. The end of the first tapered segment connected to the first cylindrical segment is the first end, and the other end is the second end. The outer diameter of the first end is the same as the outer diameter of the first cylindrical segment, and the outer diameter of the second end is the same as the outer diameter of the second cylindrical segment. The outer diameter of the externally threaded segment is smaller than the outer diameter of the second cylindrical segment. The end of the second tapered segment connected to the second cylindrical segment is the third end, and the other end is the fourth end. The outer diameter of the third end is the same as the outer diameter of the second cylindrical segment, and the outer diameter of the fourth end is the same as the outer diameter of the externally threaded segment. The first tapered segment, the second cylindrical segment, and the second tapered segment cooperate to form a stepped structure. The internally threaded rod includes an integrally formed second head and a second rod body. The second head is coaxially connected to one end of the second rod body. The outer diameter of the second rod body is the same as the outer diameter of the first cylindrical section. A connecting groove is opened on the end face of the second rod body away from the second head. An internal thread matching the external thread of the external thread section is opened on the inner wall of the connecting groove. A stepped groove matching the stepped structure is opened on the inner wall of the connecting groove away from the second head.

3. The mining flat-type connecting link according to claim 2, characterized in that: The connecting groove of the internal threaded rod has a guide post in the middle of its bottom surface. The guide post is coaxially arranged with the internal threaded rod. The external threaded section of the external threaded rod has a guide groove that matches the guide post. When the external threaded section of the external threaded rod extends into the connecting groove of the internal threaded rod for threaded connection, the guide post extends into the guide groove.

4. The mining flat-type connecting link according to claim 3, characterized in that: The end of the guide post has a third tapered section. One end of the third tapered section that is connected to the guide post is the fifth end, and the other end is the sixth end. The outer diameter of the fifth end is the same as the outer diameter of the guide post, and the outer diameter of the sixth end is smaller than the outer diameter of the fifth end.

5. The mining flat-type connecting link according to claim 4, characterized in that: A spring is provided in the connecting groove of the internally threaded rod, and the spring is fitted on the outside of the guide post.

6. The mining flat-type connecting link according to claim 5, characterized in that: One end of the spring is fixedly connected to the bottom surface of the connecting groove, and the axial height of the spring in its free state is less than the axial height of the guide post.

7. The mining flat-type connecting link according to claim 2, characterized in that: The slot is a dovetail groove.

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