A mechanical braking device for the drive wheels and / or tail wheels of a coal mine gantry crane.

Abstract

This utility model relates to the technical field of coal mine gantry crane equipment, and discloses a mechanical braking device for the drive wheel and / or tail wheel of a coal mine gantry crane. The mounting frame is fixed below the end frame of the gantry crane and located directly above the mounting wheel. The brake pawl is hinged to the lower part of the mounting frame, and the free end of the brake pawl has a locking part that engages with the brake disc. The brake disc is fixed to the inner side of the wheel body of the mounting wheel and rotates synchronously with the mounting wheel. The brake disc has axial ratchet teeth evenly distributed circumferentially on the side facing the wheel axle. The locking part of the brake pawl engages with or disengages from the axial ratchet teeth. One end of the compression spring is connected to the mounting frame, and the other end presses against the back side of the brake pawl to provide pressure to force the locking part to press against the axial ratchet teeth. When the wheel body of the mounting wheel rotates in the forward direction, the brake disc rotates, and the locking part slides against the axial ratchet teeth. When the wheel body of the mounting wheel rotates in the reverse direction, the brake pawl engages with the axial ratchet teeth to achieve braking.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mine gantry crane equipment, and in particular to a braking device, specifically a mechanical braking device for the drive wheel and / or tail wheel of a coal mine gantry crane. Background Technology

[0002] The safety of personnel transport vehicles (commonly known as "monkey cars") in mine inclined shafts is a critical concern. Existing braking technologies for monkey cars have significant flaws, making them prone to serious accidents under abnormal operating conditions. A monkey car accident in a company's auxiliary inclined shaft resulted in 3 deaths, 1 serious injury, and 15 minor injuries. Accident analysis revealed that the direct cause was a broken nylon pin in the coupling at the output end of the drive unit's reducer, causing the drive wheel to lose power and reverse. Simultaneously, multiple faults existed, including a damaged speed sensor, an incorrectly set reference speed value on the intrinsically safe control panel, and the human intervention in disabling the speed protection function. These, coupled with insufficient safety braking force and the failure of the safety brake and wire rope brake to function effectively, ultimately led to the wire rope accelerating and slipping backward, resulting in the serious casualties.

[0003] Currently, the braking methods used in the monkey car system mainly rely on electrical control: one is to monitor the speed of the steel cable via radar and use hydraulic braking when it exceeds the speed limit; the other is to rely on manual speed monitoring and manual braking. However, both methods have serious limitations. They are all operated by circuits and depend on the normal power supply and signal transmission of the electrical system. Once the system fails, there is a sudden power outage, or the nylon pin of the coupling breaks during operation, causing reverse rotation, the electrical braking system, which relies on the circuit, loses control and the braking mechanism cannot respond reliably. This can easily lead to the steel cable slipping in the opposite direction, and there are no remedial measures, posing a significant threat to the safety of passengers.

[0004] Therefore, there is a great safety hazard in the event of system failure, sudden power outage, or breakage of the nylon pin of the coupling during operation, which could lead to reverse rotation and injury. There is an urgent need to develop a more reliable braking device to overcome the above defects. Utility Model Content

[0005] To address the problem that current mine car brakes heavily rely on circuits and have a high risk of failure under extreme conditions, this invention provides a mechanical braking device for the drive wheels and / or tail wheels of a mine car.

[0006] This utility model is achieved using the following technical solution:

[0007] A mechanical braking device for the drive wheel and / or tail wheel of a coal mine gantry crane includes a mounting frame, a brake pawl, a brake disc, and a compression spring. The mounting frame is fixed below the end frame of the gantry crane and located directly above the mounting wheel. The brake pawl is hinged to the lower part of the mounting frame, and the free end of the brake pawl has an engaging part that engages with the brake disc. The brake disc is fixed to the inner side of the wheel body of the mounting wheel and rotates synchronously with the mounting wheel. Axial ratchet teeth are evenly distributed circumferentially on the side of the brake disc facing the wheel axle. The engaging part of the brake pawl may engage or disengage with the axial ratchet teeth. One end of the compression spring is connected to the mounting frame, and the other end presses against the back side of the brake pawl to provide pressure to the brake pawl, forcing the engaging part to press against the axial ratchet teeth. When the wheel body of the mounting wheel rotates forward, the brake disc rotates, and the engaging part slides against the axial ratchet teeth. When the wheel body of the mounting wheel rotates in the reverse direction, the brake pawl engages with the axial ratchet teeth to achieve braking.

[0008] During implementation, it includes a mounting bracket, brake pawl, brake disc, and compression spring;

[0009] The mounting bracket is fixed below the end frame of the monkey car and directly above the mounting wheel. The mounting bracket is fixedly connected to the end bracket of the monkey car by bolts or welding. It is used to install brake pawls and compression springs. There are no restrictions on the position of the mounting bracket.

[0010] The brake pawl is hinged to the bottom of the mounting bracket, on which a pawl mounting pin is mounted. The brake pawl is rotatably fitted onto the lower part of the pawl mounting pin. To achieve rotational balance and provide instantaneous and uniform braking force at any reversal angle, eliminating the risk of single-point failure, the brake pawls are arranged in pairs, and the two brake pawls in the pair are symmetrical about the wheel axle center of the mounting wheel. That is, the brake pawls are arranged in pairs on the same diameter of the mounting wheel, and the engaging parts face opposite directions.

[0011] The free end of the brake pawl is provided with an engaging part, which engages with the brake disc;

[0012] The brake disc is fixed inside the wheel body of the mounting wheel and rotates synchronously with the mounting wheel. Furthermore, the brake disc is fixed to the upper surface of the spokes of the mounting wheel by bolts. The brake pawl is at the same height as the brake disc. The brake disc has axial ratchet teeth evenly distributed circumferentially on the side facing the wheel axle. The engaging part of the brake pawl is either engaged or disengaged from the axial ratchet teeth.

[0013] The compression spring provides a constant preload. One end of the compression spring is connected to the mounting bracket, on which a compression spring mounting pin is mounted. The lower part of the compression spring mounting pin radially limits and guides the compression spring. The other end presses against the back of the brake pawl to provide pressure to the brake pawl, forcing the engaging part to press against the axial ratchet. A spring seat is mounted on the back of the brake pawl, and the end of the compression spring is accommodated in the spring seat.

[0014] Furthermore, the mounting bracket is equipped with an adjustment mechanism for adjusting the preload of the compression spring. The mounting bracket has an elongated adjustment groove, through which the compression spring mounting pin passes and can move and lock along the length of the groove. Alternatively, other compression spring preload adjustment mechanisms can be used.

[0015] When the mounting wheel rotates in the forward direction, the brake disc rotates, and the engaging part slides against the axial ratchet; when the mounting wheel rotates in the reverse direction, the brake pawl engages with the axial ratchet to achieve braking.

[0016] When in use, when the mounting wheel rotates normally, it drives the brake disc to rotate synchronously; the axial ratchet overcomes the pressure of the compression spring and pushes the engaging part of the brake pawl, and the brake pawl rotates slightly around the pawl mounting pin, producing regular sliding; the brake pawl only oscillates periodically and does not mesh with the axial ratchet, and operates normally.

[0017] When an accident causes the mounting wheel to rotate in the opposite direction, the brake disc rotates in the opposite direction simultaneously. The engaging part of the brake pawl engages with the groove of the axial ratchet, and the brake pawl meshes with the axial ratchet. That is, the ventral side of the axial ratchet instantly contacts the engaging part of the brake pawl, locking it in place and generating a braking torque. This forces the brake disc to stop rotating, thus achieving mechanical emergency braking of the entire mounting wheel.

[0018] During equipment adjustment, the pre-compression of the compression spring can be changed by moving the spring mounting pin that passes through the adjustment slot, thereby adjusting the preload force acting on the brake pawl. After adjustment, lock the spring mounting pin.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This utility model provides a mechanical braking device for the drive wheel and / or tail wheel of a coal mine gantry crane. It achieves braking function through a purely mechanical structure, fundamentally eliminating reliance on electrical systems. The purely mechanical structure enables automatic detection and instantaneous braking of reverse rotation, significantly improving the safety redundancy of the gantry crane system; no external power supply or electrical signal triggering is required. The device can still maintain normal operation in the event of electrical failures such as power outages, sensor damage, or control circuit malfunctions. It also monitors the drive shaft speed and direction in real time.

[0021] This device only allows normal unidirectional rotation. If the wire rope abnormally reverses, causing the drive wheel and tail wheel to rotate in the opposite direction, it is forcibly braked, immediately triggering the braking mechanism. In extreme conditions such as a broken nylon pin in the coupling leading to loss of drive force and reverse rotation, this device can act as a last line of defense, effectively compensating for the potential failures of existing hydraulic and manual braking systems. This device effectively reduces the risk of serious accidents and is of great significance for ensuring the safety of transportation in mine inclined shafts. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0023] Figure 2 This is a top view of the present invention.

[0024] Figure 3 This is a schematic diagram showing the installation positions of the brake pawl and brake disc of this utility model.

[0025] Figure 4 This is a schematic diagram showing the installation positions of the pawl mounting pin and the spring mounting pin of this utility model.

[0026] Figure 5 This is a schematic diagram of the compression spring installation of this utility model.

[0027] Figure 6 This is a schematic diagram showing the installation position of the brake disc of this utility model.

[0028] In the diagram: 1. Mounting wheel; 101. Spoke; 102. Wheel body; 2. Brake pawl; 201. Engaging part; 3. Brake disc; 301. Axial ratchet; 4. Compression spring; 5. Mounting bracket; 6. Pawl mounting pin; 7. Compression spring mounting pin; 8. End frame. Detailed Implementation

[0029] The specific embodiments of this utility model will be described below with reference to the accompanying drawings.

[0030] A mechanical braking device for the drive wheels and / or tail wheels of a coal mine gantry crane, such as Figures 1-6 As shown: including mounting bracket 5, brake pawl 2, brake disc 3, and compression spring 4;

[0031] Mounting bracket 5 is fixed below the end frame 8 of the monkey car and is located directly above the mounting wheel 1. The mounting wheel 1 is the drive wheel and / or tail wheel. Mounting bracket 5 is fixedly connected to the end bracket of the monkey car by bolts or welding. It is used to install brake pawl 2 and compression spring 4. The position of mounting bracket 5 is not restricted.

[0032] The brake pawl 2 is hinged to the lower part of the mounting bracket 5. The mounting bracket 5 is fitted with a pawl mounting pin 6. The brake pawl 2 is rotatably fitted onto the lower part of the pawl mounting pin 6. In order to achieve rotational balance and provide instantaneous and uniform braking force at any reversal angle, eliminating the risk of single-point failure, the brake pawl 2 is set in pairs. The two brake pawls in the pair are symmetrical about the wheel axle center of the mounting wheel 1. That is, the brake pawl 2 is set in pairs on the same diameter of the mounting wheel 1, and the engaging part 201 faces opposite directions.

[0033] The free end of the brake pawl 2 is provided with a locking part 201, which engages with the brake disc 3;

[0034] The brake disc 3 is fixed inside the wheel body 102 of the mounting wheel 1 and rotates synchronously with the mounting wheel 1. Furthermore, the brake disc 3 is fixed to the upper surface of the spoke plate 101 of the mounting wheel 1 by bolts. The brake pawl 2 and the brake disc 3 are at the same height. The brake disc 3 has axial ratchet teeth 301 evenly distributed circumferentially on the side facing the wheel axle. The engaging part 201 of the brake pawl 2 is either engaged or disengaged from the axial ratchet teeth 301.

[0035] The compression spring 4 provides a constant preload. One end of the compression spring 4 is connected to the mounting bracket 5. The mounting bracket 5 is fitted with a compression spring mounting pin 7. The lower part of the compression spring mounting pin 7 radially limits and guides the compression spring 4. The other end presses against the back side of the brake pawl 2 to provide pressure to the brake pawl 2, forcing the engaging part 201 to press against the axial ratchet 301. A spring seat (not shown in the figure) is installed on the back side of the brake pawl 2, and the end of the compression spring 4 is accommodated in the spring seat.

[0036] Furthermore, the mounting bracket 5 is provided with an adjustment mechanism for adjusting the preload of the compression spring 4. The mounting bracket 5 has an elongated adjustment groove, and the compression spring mounting pin 7 passes through the adjustment groove and can move and lock along the length of the adjustment groove.

[0037] When the wheel body 102 of the mounting wheel 1 rotates in the forward direction, the brake disc 3 rotates, and the engaging part 201 slides against the axial ratchet 301; when the wheel body 102 of the mounting wheel 1 rotates in the reverse direction, the brake pawl 2 engages with the axial ratchet 301 to achieve braking.

[0038] When in use, when the mounting wheel 1 rotates normally, it drives the brake wheel disc 3 to rotate synchronously at the same frequency; the axial ratchet 301 overcomes the pressure of the compression spring 4 and pushes the engaging part 201 of the brake pawl 2. The brake pawl 2 rotates slightly around the pawl mounting pin 6, producing regular sliding; the brake pawl 2 only swings periodically and does not engage with the axial ratchet 301, and operates normally.

[0039] When an accident causes the mounting wheel 1 to rotate in the opposite direction, the brake disc 3 rotates in the opposite direction simultaneously. The engaging part 201 of the brake pawl 2 engages in the groove of the axial ratchet 301. The brake pawl 2 meshes with the axial ratchet 301, that is, the ventral side of the axial ratchet 301 instantly contacts and locks against the engaging part 201 of the brake pawl 2, generating a braking torque that forces the brake disc 3 to stop rotating, thereby achieving mechanical emergency braking of the entire mounting wheel 1.

[0040] During equipment adjustment, the pre-compression of the compression spring 4 can be changed by moving the spring mounting pin 7 that passes through the adjustment groove, thereby adjusting the preload force acting on the brake pawl 2. After adjustment, the spring mounting pin 7 is locked.

[0041] The scope of protection claimed by this utility model is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this utility model can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mechanical braking device for the drive wheels and / or tail wheels of a coal mine gantry crane, characterized in that: Includes mounting bracket (5), brake pawl (2), brake disc (3), and compression spring (4); The mounting bracket (5) is fixed below the end frame (8) of the monkey car and is located directly above the mounting wheel (1); The brake pawl (2) is hinged to the bottom of the mounting bracket (5), and the free end of the brake pawl (2) is provided with a locking part (201), which cooperates with the brake disc (3); The brake disc (3) is fixed to the inner side of the wheel body (102) of the mounting wheel (1) and rotates synchronously with the mounting wheel (1). The brake disc (3) has axial ratchet teeth (301) evenly distributed circumferentially on the side facing the wheel axle. The engaging part (201) of the brake pawl (2) is either engaged or disengaged from the axial ratchet teeth (301). One end of the compression spring (4) is connected to the mounting bracket (5), and the other end presses against the back side of the brake pawl (2) to provide pressure to the brake pawl (2) to force the engaging part (201) to press against the axial ratchet (301); When the wheel body (102) of the mounting wheel (1) rotates in the forward direction, the brake disc (3) rotates, and the engaging part (201) slides with the axial ratchet (301); when the wheel body (102) of the mounting wheel (1) rotates in the reverse direction, the brake pawl (2) engages with the axial ratchet (301) to achieve braking.

2. The mechanical braking device for the drive wheel and / or tail wheel of a coal mine trolley according to claim 1, characterized in that: The mounting bracket (5) is fitted with a pawl mounting pin (6), and the brake pawl (2) is rotatably fitted onto the lower part of the pawl mounting pin (6); the mounting bracket (5) is fitted with a spring mounting pin (7), and the lower part of the spring mounting pin (7) radially limits and guides the spring (4).

3. The mechanical braking device for the drive wheel and / or tail wheel of a coal mine trolley according to claim 1, characterized in that: A spring seat is installed on the back side of the brake pawl (2), and the end of the compression spring (4) is accommodated in the spring seat.

4. The mechanical braking device for the drive wheel and / or tail wheel of a coal mine trolley according to claim 1, characterized in that: The brake disc (3) is fixed to the upper surface of the spoke (101) of the mounting wheel (1) by bolts, and the brake pawl (2) is at the same height as the brake disc (3).

5. The mechanical braking device for the drive wheel and / or tail wheel of a coal mine trolley according to claim 1, characterized in that: The mounting bracket (5) is fixedly connected to the end bracket of the monkey car by bolts or welding.

6. The mechanical braking device for the drive wheel and / or tail wheel of a coal mine trolley according to claim 1, characterized in that: The brake pawls (2) are arranged in pairs, and the two brake pawls (2) in the pair are symmetrical about the wheel axle center of the mounting wheel (1).

7. The mechanical braking device for the drive wheel and / or tail wheel of a coal mine trolley according to claim 2, characterized in that: The mounting bracket (5) is provided with an adjustment mechanism for adjusting the preload of the compression spring (4).

8. The mechanical braking device for the drive wheel and / or tail wheel of a coal mine trolley according to claim 7, characterized in that: The mounting bracket (5) has a long strip-shaped adjustment groove, and the spring mounting pin (7) passes through the adjustment groove and can move and lock along the length of the adjustment groove.

Images