A connecting bolt for a mine car
By designing a mine car connection pin that automatically locks and unlocks quickly, the problem of cumbersome manual installation of anti-detachment pins in existing technologies is solved, simplifying the mine car connection operation process and enabling long-distance identification of the pin status in low-light environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEILONGJIANG SANCHEN HEAVY MASCH MFG CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-23
Smart Images
Figure CN224392609U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mine car pin technology, and in particular to a connecting pin for mine cars. Background Technology
[0002] A mine car is a small rail transport device used in underground mining operations. It is mainly used to transport ore, waste rock, coal, tools, or materials in roadways or tunnels. Mine cars are connected by connecting pins. The connecting pin is a key component in the underground rail transport system, used to connect mine cars to each other and to the locomotive. Its core function is to ensure that multiple mine cars form a stable formation during operation, while withstanding traction, impact, and vibration, preventing decoupling or separation accidents. Structurally, the connecting pin is usually made of high-quality alloy steel, forged or heat-treated, possessing high tensile strength and shear resistance. Its design is often cylindrical or conical, with a cotter pin hole at one end to prevent detachment, and a beveled or ball-head design at the other end for easy insertion or removal.
[0003] The existing mine car connecting pins use cotter pin holes and anti-detachment pins to achieve anti-detachment fixation. When connecting mine cars, after the mine car connecting pins are installed, the anti-detachment pins need to be installed manually, making the mine car connecting pin fixing process cumbersome. Furthermore, before the mine cars are put into operation, it is necessary to closely check whether each mine car connecting pin has been fixed with an anti-detachment pin, which again makes the preparation process cumbersome. Utility Model Content
[0004] This invention addresses the problem that existing mine car connecting pins require manual installation of anti-detachment pins after installation, resulting in a cumbersome fixing process. Furthermore, before the mine car begins operation, it is necessary to closely inspect each connecting pin to ensure that anti-detachment pins are installed, further complicating the preparation process. Therefore, this invention provides a connecting pin for mine cars to solve the problems mentioned in the background art.
[0005] The technical solution of this utility model is:
[0006] A connecting pin for a mine car includes a fixing plate, an upper ear plate, a lower ear plate, and a pin. The fixing plate is provided with an upper ear plate and a lower ear plate, and the pin passes through the upper ear plate and the lower ear plate in sequence.
[0007] It also includes a lock box, fixed claws and a locking mechanism. The lock box is fixed at the lower end of the lower ear plate. A rotating shaft is provided in the lock box. Two fixed claws are rotatably connected to the rotating shaft. A locking part is provided on the pin. A locking mechanism is provided at the lower end of the lock box. The locking mechanism is used to drive the fixed claws to insert or disengage from the locking part.
[0008] Furthermore, the locking mechanism includes a connecting rod, a sliding pin, and a spring. The connecting rod is slidably connected to the lower end of the lock box, and a sliding pin is provided at the top of the connecting rod. A groove is provided on the fixed gripper, and the sliding pin is slidably connected in the groove. A spring is provided on the connecting rod, and the spring causes the connecting rod to have a downward sliding tendency.
[0009] Furthermore, a limit seat is provided at the upper end of the connecting rod, and a sliding column is provided at the upper end of the limit seat.
[0010] Furthermore, the upper end of the fixed gripper is chamfered, and the lower end of the pin is rounded.
[0011] Furthermore, a convex ring is provided on the connecting rod, and the two ends of the spring abut against the lower end face of the lock box and the upper end face of the convex ring, respectively.
[0012] Furthermore, a light-shielding tube is provided at the lower end of the lock box, and a transparent part is provided in the light-shielding tube. The side wall of the convex ring is provided with a reflective coating.
[0013] Furthermore, a pull handle is provided at the lower end of the connecting rod.
[0014] Furthermore, a limiting part is provided at the upper end of the pin.
[0015] Furthermore, a pull ring is provided at the upper end of the limiting part.
[0016] Furthermore, the fixing plate has multiple fixing holes.
[0017] Compared with the prior art, the present invention has the following advantages:
[0018] 1. A connecting pin for a mine car, comprising a set of fixed grippers that close via a spring drive. The pin has a locking part. When the pin is inserted from top to bottom into the upper and lower ear plates, the rounded corner at the lower end of the pin pushes the fixed grippers to separate to both sides. After the pin is fully inserted, the spring drives the two fixed grippers to close, and the fixed grippers hook the locking part to secure the pin. When it is necessary to unlock the pin, a connecting rod is pulled down, and the connecting rod drives the two fixed grippers to separate to both sides via a sliding pin, thus unlocking the pin. This mechanism achieves automatic locking and quick unlocking of the pin, eliminating the need to carry the connecting pin and corresponding installation wrench when connecting the mine car, and saving the steps of installing and removing the anti-detachment pin.
[0019] 2. A raised ring coated with a reflective layer is installed on the connecting rod. An opaque light-shielding tube on the outside of the connecting rod contains a transparent section to indicate whether the pin is locked. When unlocked, the connecting rod is at the lower end, and the raised ring is below the transparent section; the raised ring cannot be seen through the transparent section at this time, indicating the unlocked state. After locking, the connecting rod moves upward, and the raised ring coincides with the transparent section. At this time, the reflective-coated raised ring can be seen through the transparent section, indicating the locked state. This provides a clear indication of the pin's locked and unlocked states. Before the mine car begins operation, the lock status can be identified by observing the reflective-coated raised ring, enabling pin detection even at long distances or in low-light conditions underground. Attached Figure Description
[0020] Figure 1 A structural schematic diagram of this utility model from the upper right perspective;
[0021] Figure 2 A structural schematic diagram of this utility model from the lower left perspective;
[0022] Figure 3 This is a schematic diagram of the pin structure;
[0023] Figure 4 This is a longitudinal sectional view of the present invention;
[0024] Figure 5 Exploded view of the fixed grab and linkage;
[0025] Figure 6 This is a longitudinal sectional view of the lock box and locking mechanism;
[0026] Figure 7 This is a longitudinal sectional view of the lock box;
[0027] Figure 8 This is a longitudinal cross-sectional view of the locking state of the pin in the utility model.
[0028] Figure 9 This is a longitudinal cross-sectional view of the light-shielding cylinder and connecting rod.
[0029] In the diagram: 101, fixing plate; 102, upper ear plate; 103, lower ear plate; 104, fixing hole; 2, pin; 201, limiting part; 202, pull ring; 203, rounded corner; 301, lock box; 302, fixing grab; 303, locking part; 304, chamfer; 305, slide groove; 4, locking mechanism; 401, connecting rod; 402, sliding column; 403, spring; 404, limiting seat; 405, pull handle; 501, convex ring; 502, light shield; 503, transparent part. Detailed Implementation
[0030] Specific implementation method one: See Figure 1-5As shown, a connecting pin for a mine car, in this embodiment, includes a fixing plate 101, an upper ear plate 102, a lower ear plate 103 and a pin 2. The fixing plate 101 is provided with an upper ear plate 102 and a lower ear plate 103, and the pin 2 passes through the upper ear plate 102 and the lower ear plate 103 in sequence.
[0031] It also includes a lock box 301, a fixed grabber 302 and a locking mechanism 4. The lock box 301 is fixed to the lower end of the lower ear plate 103. A rotating shaft is provided in the lock box 301, and two fixed grabbers 302 are rotatably connected to the rotating shaft. A locking part 303 is provided on the pin 2. The locking mechanism 4 is provided at the lower end of the lock box 301. The locking mechanism 4 is used to drive the fixed grabbers 302 to insert or disengage from the locking part 303.
[0032] Furthermore, the fixing plate 101 is used to fix it to the mine car. The upper ear plate 102 and the lower ear plate 103 are parallel to each other and vertically fixed to the fixing plate 101. The upper ear plate 102 and the lower ear plate 103 are concentrically provided with circular holes, and the pin 2 passes through the aforementioned circular holes sequentially through the upper ear plate 102 and the lower ear plate 103. The lock box 301 is a box-shaped structure with an opening at the upper end and a cavity inside. It is fixed to the lower end face of the lower ear plate 103 by welding or bolts. A rotating shaft is provided in the lock box 301, and a shoulder is provided on the rotating shaft to limit the fixed grab 302, so that the fixed grab 302 rotates at the center of the lock box 301.
[0033] by Figure 4 Taking the fixed gripper 302 on the left as an example, the fixed gripper 302 is divided into a hook portion above the rotating shaft and a linkage portion below the rotating shaft. The hook portion is located on the outside of the pin 2, and the locking portion 303 in the pin 2 is an annular groove. The hook portion in the fixed gripper 302 is inserted into the locking portion 303 to fix the pin 2; the hook portion in the fixed gripper 302 is disengaged from the locking portion 303 to unlock the pin 2. The locking mechanism 4 is used to push the linkage portion of the fixed gripper 302, so that the two fixed grippers 302 can simultaneously separate to the sides or simultaneously close to the center.
[0034] Specific Implementation Method Two: See Figure 4-7 As shown, the locking mechanism 4 of this embodiment includes: a connecting rod 401, a sliding column 402, and a spring 403. The connecting rod 401 is slidably connected to the lower end of the lock box 301. The top end of the connecting rod 401 is provided with a sliding column 402. A groove 305 is provided on the fixed gripper 302. The sliding column 402 is slidably connected in the groove 305. The connecting rod 401 is provided with a spring 403, which causes the connecting rod 401 to have a downward sliding tendency.
[0035] Furthermore, a circular hole is provided at the center of the lower end of the lock box 301, and the connecting rod 401 is slidably connected in the circular hole. A sliding post 402 perpendicular to the end face of the fixed gripper 302 is provided at the upper end of the connecting rod 401. Figure 4Taking the fixed grab 302 on the left side as an example, a sliding groove 305 is provided on the linkage part of the fixed grab 302. The sliding groove 305 is located below the pivot in the lock box 301 and is inclined from the upper left to the lower right. The sliding column 402 at the upper end of the connecting rod 401 is slidably connected in the sliding groove 305. When the sliding column 402 slides downward in the sliding groove 305, the sliding column 402 pushes the sliding groove 305 to make the two fixed grabs 302 close towards the center, completing the locking action; when the sliding column 402 slides upward in the sliding groove 305, the sliding column 402 pushes the sliding groove 305 to make the two fixed grabs 302 separate to the sides, completing the unlocking action. Spring 403 is fitted onto connecting rod 401 and is located at the bottom of lock box 301. The lower end of spring 403 is fixedly connected to connecting rod 401, and the upper end of spring 403 abuts against the lower end face of lock box 301. Spring 403 causes connecting rod 401 to tend to move downward, thereby causing fixed catch 302 to always tend to move towards the center. When pin 2 is inserted from top to bottom into upper ear plate 102 and lower ear plate 103, the rounded corner 203 at the lower end of pin 2 pushes fixed catch 302 to separate to both sides. After pin 2 is fully inserted, spring 403 drives the two fixed catches 302 to close, and the fixed catches 302 hook onto the locking part 303 to complete the fixation. When it is necessary to unlock pin 2, pull connecting rod 401 down. Connecting rod 401 drives the two fixed catches 302 to separate to both sides through sliding post 402, thus unlocking pin 2. This mechanism enables automatic locking and quick unlocking of pin 2, eliminating the need to carry the connecting pin and corresponding installation wrench when connecting to the mine car, and saving the steps of installing and removing the anti-detachment pin.
[0036] Specific implementation method three: See Figure 4-7 As shown, in this embodiment, the upper end of the connecting rod 401 is provided with a limiting seat 404, and the sliding column 402 is provided at the upper end of the limiting seat 404.
[0037] Furthermore, the limiting seat 404 has a triangular structure, which serves to fix the sliding column 402 and prevent the connecting rod 401 and the fixed grab 302 from interfering with each other. The limiting seat 404 also acts as a limiter. When the connecting rod 401 moves downward to the lower limit position, the lower end face of the limiting seat 404 contacts the inner wall of the lock box 301, preventing the connecting rod 401 from moving downward beyond its stroke and causing the two fixed grabs 302 to close excessively.
[0038] Detailed Implementation Method Four: See [link] Figure 3 As shown, the upper end of the fixing claw 302 in this embodiment is provided with a chamfer 304, and the lower end face of the pin 2 is provided with a rounded corner 203.
[0039] Furthermore, the chamfer 304 on the fixing claw 302 and the rounded corner 203 on the pin 2 serve as guides, making it easier for the pin 2 to push the two fixing claws 302 apart when it is inserted downwards. When the pin 2 is not inserted, the upper end of the fixing claw 302 rests against the lower end surface of the lower ear plate 103, and the distance between the tops of the chamfer 304 on the upper ends of the two fixing claws 302 is greater than the diameter of the pin 2, which facilitates the insertion of the pin 2 from top to bottom and pushes the fixing claws 302 apart to the sides.
[0040] Specific implementation method five: See Figure 7 As shown, in this embodiment, a convex ring 501 is provided on the connecting rod 401, and the two ends of the spring 403 abut against the lower end face of the lock box 301 and the upper end face of the convex ring 501, respectively.
[0041] Furthermore, the spring 403 is a compression spring, and the convex ring 501 is disposed on the connecting rod 401 located at the bottom of the lock box 301. When the spring 403 extends, it pushes the convex ring 501 to move upward, which in turn drives the connecting rod 401 to move upward.
[0042] Specific implementation method six: See Figure 5-9 As shown, the lower end of the lock box 301 in this embodiment is provided with a light-shielding tube 502, a transparent part 503 is provided in the light-shielding tube 502, and a reflective coating is provided on the side wall of the convex ring 501.
[0043] Furthermore, the light-shielding tube 502 is a cylindrical, opaque structure, concentrically arranged with the connecting rod 401, and the convex ring 501 is slidably connected inside the light-shielding tube 502. A circular hole is provided at the lower end of the light-shielding tube 502, and the connecting rod 401 is slidably connected in this hole. The side wall of the convex ring 501 is provided with a glass microsphere reflective coating to indicate whether the latch 2 is locked. When not locked, the connecting rod 401 is located at the lower end, and the convex ring 501 is located at the lower end of the transparent part 503. At this time, the convex ring 501 cannot be observed from the transparent part 503; this state is the unlocked state. After locking, the connecting rod 401 moves upward, and the convex ring 501 coincides with the transparent part 503. At this time, the reflective coated convex ring 501 can be observed from the transparent part 503; this state is the locked state. The system enables a clear display of the locked and unlocked states of the pin 2. Before the mine car starts working, the lock status of the pin 2 can be identified by observing the reflective convex ring 501, thus completing the detection of the pin 2 at a distance or in low-light environments underground.
[0044] Detailed implementation method seven: See Figure 7 As shown, the lower end of the connecting rod 401 in this embodiment is provided with a handle 405.
[0045] Furthermore, the pull handle 405 is used to increase the gripping area of the linkage 401, making it easier to pull down the linkage 401 to unlock the fixed grip 302.
[0046] Detailed Implementation Method Eight: See also Figure 3 As shown, the upper end of the pin 2 in this embodiment is provided with a limiting part 201.
[0047] Furthermore, the limiting part 201 has a cylindrical structure. After the pin 2 is inserted, the lower end face of the limiting part 201 abuts against the upper end face of the upper ear plate 102, thereby limiting the insertion depth of the pin 2. This ensures that the relative position of the fixing claw 302 and the locking part 303 is accurate, preventing the pin 2 from being inserted too deeply, which would cause the fixing claw 302 and the locking part 303 to misalign.
[0048] Detailed implementation method nine: See Figure 3 As shown, a pull ring 202 is provided at the upper end of the limiting part 201 in this embodiment.
[0049] Furthermore, the pull ring 202 is used to connect the iron cable, making it easy to lift the pin 2 upwards.
[0050] Detailed Implementation Method Ten: See [link] Figure 1-2 As shown, the fixing plate 101 of this embodiment has a plurality of fixing holes 104. The fixing holes 104 are used to fix the present invention to the connection part of the mine car.
[0051] In use, place the three-ring connection of the mine car between the upper ear plate 102 and the lower ear plate 103, insert the pin 2 downwards into the upper ear plate 102 and the lower ear plate 103 until you hear a knocking sound as the fixing claw 302 engages with the locking part 303. Check if the reflective layer of the convex ring 501 can be observed through the transparent part 503 to complete the connection of the mine car. To disassemble, pull down the pull ring 202 to remove the pin 2 from between the upper ear plate 102 and the lower ear plate 103 to disconnect the mine car connection.
[0052] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A connecting pin for a mine car, comprising a fixing plate (101), an upper ear plate (102), a lower ear plate (103) and a pin (2), wherein the fixing plate (101) is provided with an upper ear plate (102) and a lower ear plate (103), and the pin (2) passes through the upper ear plate (102) and the lower ear plate (103) in sequence. Its features are: It also includes a lock box (301), a fixed grab (302) and a locking mechanism (4). The lock box (301) is fixed at the lower end of the lower ear plate (103). A rotating shaft is provided in the lock box (301), and two fixed grabs (302) are rotatably connected on the rotating shaft. A locking part (303) is provided on the pin (2). A locking mechanism (4) is provided at the lower end of the lock box (301). The locking mechanism (4) is used to drive the fixed grabs (302) to insert or disengage from the locking part (303).
2. The connecting pin for a mine car according to claim 1, characterized in that: The locking mechanism (4) includes a connecting rod (401), a sliding column (402) and a spring (403). The connecting rod (401) is slidably connected to the lower end of the lock box (301). The top end of the connecting rod (401) is provided with a sliding column (402). A groove (305) is provided on the fixed grab (302). The sliding column (402) is slidably connected in the groove (305). A spring (403) is provided on the connecting rod (401). The spring (403) causes the connecting rod (401) to have a downward sliding tendency.
3. The connecting pin for a mine car according to claim 2, characterized in that: A limit seat (404) is provided at the upper end of the connecting rod (401), and a sliding column (402) is provided at the upper end of the limit seat (404).
4. The connecting pin for a mine car according to claim 1, characterized in that: The upper end of the fixed gripper (302) is provided with a chamfer (304), and the lower end of the pin (2) is provided with a rounded corner (203).
5. The connecting pin for a mine car according to claim 2, characterized in that: A convex ring (501) is provided on the connecting rod (401), and the two ends of the spring (403) abut against the lower end face of the lock box (301) and the upper end face of the convex ring (501), respectively.
6. The connecting pin for a mine car according to claim 5, characterized in that: A light-shielding tube (502) is provided at the lower end of the lock box (301), and a transparent part (503) is provided in the light-shielding tube (502). A reflective coating is provided on the side wall of the convex ring (501).
7. The connecting pin for a mine car according to claim 2, characterized in that: A handle (405) is provided at the lower end of the connecting rod (401).
8. The connecting pin for a mine car according to claim 1, characterized in that: The upper end of the pin (2) is provided with a limiting part (201).
9. The connecting pin for a mine car according to claim 8, characterized in that: A pull ring (202) is provided at the upper end of the limiting part (201).
10. The connecting pin for a mine car according to claim 1, characterized in that: The fixing plate (101) has multiple fixing holes (104).