Elastic limiting protection device of coal mining machine

Abstract

The utility model relates to the technical field of coal mining machine protection, in particular to an elastic limiting protection device of a coal mining machine, which comprises a guide cylinder, one end of a guide rod extends into the guide cylinder, and the other end of the guide rod extends out of a front opening of the guide cylinder to face the coming direction of the coal mining machine; the buffering piece is located in the guide cylinder and connected with the end, stretching into the guide cylinder, of the guide rod. The trigger part is movably mounted at the rear end of the guide cylinder, and the front end of the trigger part extends into the middle rear part in the guide cylinder and is close to the buffer part; the travel switch is mounted at the rear end of the guide cylinder, is also positioned on the rear side of the trigger piece and is used for detecting the distance between the travel switch and the rear end of the trigger piece; elastic protection is achieved, violent collision and impact can be prevented, the sudden stop function is achieved, and mechanical faults caused by collision of the coal mining machine are reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal mining machine protection technology, specifically to a coal mining machine elastic limit protection device. Background Technology

[0002] When the coal mining machine travels to the head or tail of the scraper conveyor, there must be a limit device to prevent the coal mining machine from falling off the track, so that it can turn around and cut coal in time to ensure the normal operation of the coal mining machine.

[0003] Currently, the most common method used in China is to use welded steel plates for mechanical limiting. However, this method has a large impact force, which can cause mechanical damage to the coal mining machine and easily lead to safety accidents.

[0004] CN220469909U, a novel coal mining machine limit device, uses a buffer plate to buffer the impact; when an impact occurs, the machine needs to be stopped by the driver, and the degree of impact cannot be detected.

[0005] Based on this, this solution provides an elastic limit protection device for a coal mining machine, which utilizes the elasticity of the spring and the emergency stop protection function of the limit switch to protect the coal mining machine from severe collisions. Utility Model Content

[0006] (I) Technical Issues

[0007] The present invention aims to at least solve the problem in the prior art of buffering the collision while detecting the collision force.

[0008] (II) Technical Content

[0009] This solution provides an elastic limit protection device for a coal mining machine. This solution features a reasonable structure, reliable performance, elastic protection, prevention of severe collisions and impacts, and an emergency stop function, reducing mechanical failures of the coal mining machine caused by collisions. This is achieved through the following specific technical means:

[0010] Guide cylinders are installed at the head or tail of the scraper conveyor.

[0011] The guide rod extends into the guide cylinder at its rear end;

[0012] The buffer, located in the guide tube and connected to the rear end of the guide rod, absorbs the impact force through elastic deformation when an impact occurs.

[0013] The trigger element is movably mounted at the rear end of the guide tube, with the front end of the trigger element extending into the middle and rear part of the guide tube. When no impact occurs, the rear end of the guide rod is away from the front end of the trigger element. When an impact occurs, the guide rod moves backward to first compress the buffer element and then contacts the front end of the trigger element, pushing the trigger element backward.

[0014] The limit switch, installed at the rear end of the guide cylinder, is used to detect the distance between it and the rear end of the trigger element. By detecting the change in the distance between the rear end of the trigger element and the contact of the limit switch, the magnitude of the impact force can be fed back.

[0015] Preferred technical solution 1: The limit switch is also connected to the stop switch signal of the coal mining machine;

[0016] If the coal mining machine operator discovers a collision but fails to stop the coal mining machine in time, the limit switch is triggered to send a feedback signal to the stop switch to close the machine and stop it from continuing to move.

[0017] The initial length of the front end extending into the guide tube before triggering is calculated and set according to the actual situation to ensure that the coal mining machine has sufficient braking time.

[0018] Preferred technical solution 2: A set of fixing pins is installed through the middle rear side wall of the guide cylinder, and the front end of the triggering element slides through the fixing pins to the front side of the fixing pins, with the fixing pins located on the rear side of the buffer element.

[0019] Preferred technical solution 3: The triggering element is composed of a rod on the front side and an enlarged block on the rear side, which are fixedly connected. The rod slides through the hole on the fixing pin and extends to the front side of the fixing pin, while the enlarged block is located at the rear end of the fixing pin.

[0020] Preferred technical solution four: The buffer component is preferably a spring, and the spring model is adjusted according to actual measurement data. The front end of the trigger rod extends through the hole in the annular fixing block to the inner ring of the spring.

[0021] (III) Technical Effects

[0022] The above structure gives this solution the following advantages:

[0023] 1. It can be installed at the head and tail of the scraper conveyor with bolts, making it easy to install and disassemble;

[0024] 2. It can protect both the coal mining machine and the scraper conveyor from impact;

[0025] 3. When the coal mining machine crashes, the buffer can play a certain role in cushioning the impact, and the coal mining machine operator can stop the machine in time. If the machine is not stopped in time, the limit switch will be triggered to perform emergency stop protection. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of this solution;

[0028] Figure 2 This is a sectional view of the scheme;

[0029] Figure 3 This is the rear view of this solution.

[0030] Among them, 1. guide rod, 11. front plate, 2. guide cylinder, 3. buffer, 4. annular fixing block, 5. fixing pin, 6. trigger, 61. rod body, 62. expansion block, 7. limit switch. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] Please see Figures 1-2 The elastic limit protection device for the coal mining machine includes a guide cylinder 2, a guide rod 1 and a buffer 3. The guide cylinder 2 is fixedly installed at the head or tail of the scraper conveyor, while one end of the guide rod 1 extends into the guide cylinder 2 and the other end extends out from the front of the guide cylinder 2 towards the direction of the coal mining machine.

[0034] The buffer 3 is preferably a spring, located in the guide cylinder 2 and connected to one end of the guide rod 1 that extends into the guide cylinder 2, to provide an elastic connection between the two and to absorb the impact force through elastic deformation when an impact occurs. The model of the spring is adjusted according to the actual measurement data.

[0035] The front end of the guide rod 1 is fixedly connected to the front plate 11, which increases the contact area with the coal mining machine.

[0036] Example 2

[0037] Based on Example 1, please refer to Figures 1-3 The elastic limit protection device for the coal mining machine also includes a fixing pin 5, a trigger element 6, and a limit switch 7;

[0038] The rear end of the guide cylinder 2 is an open structure. The fixing pin 5 passes through the middle rear side wall of the guide cylinder 2 and is fixed. An annular fixing block 4 is fixed inside the guide cylinder 2 in front of the fixing pin 5. A spring is connected between the annular fixing block 4 and the rear end of the guide rod 1.

[0039] The trigger 6 is composed of a front rod 61 and a rear enlarged block 62. The rod 61 slides through the hole in the fixing pin 5 and extends to the front of the fixing pin 5. The enlarged block 62 is located at the rear end of the fixing pin 5 and slides in the rear port of the guide cylinder 2. The enlarged block 62 is designed to limit the forward movement of the rod 61. The front end of the rod 61 of the trigger 6 passes through the central hole of the annular fixing block 4 and extends into the inner cavity of the spring. The diameter of the central hole of the annular fixing block 4 is larger than the diameter of the rod 61.

[0040] Limit switch 7 is fixedly installed at the rear end of guide cylinder 2 and is also located at the rear side of the expansion block 62 of trigger element 6. It is used to detect the distance between it and the rear end of expansion block 62.

[0041] When no impact occurs, the rear end of the guide rod 1 is away from the front end of the rod body 61. When an impact occurs, the guide rod 1 moves backward to compress the buffer 3 first. After the buffer 3 is compressed to a certain extent, before it is fully compressed, the guide rod 1 approaches and contacts the front end of the rod body 61 and pushes the trigger 6 to move backward.

[0042] The greater the impact force, the greater the deformation of the buffer 3. When the coal mining machine operator stops the machine in time, so that the guide rod 1 does not contact the trigger 6, only the buffer 3 is used for physical buffering.

[0043] If the driver fails to stop the machine in time, causing the guide rod 1 to further compress the buffer 3 and begin to contact the trigger 6 and push the trigger 6 closer to the limit switch 7, the limit switch 7 can detect the change in the distance between the rear end of the trigger 6 and the contact of the limit switch 7, which can provide feedback on the magnitude of the impact force to a certain extent.

[0044] The limit switch 7 is preferably a limit switch 7 with wireless communication function, and the limit switch 7 is also connected to the stop switch signal of the coal mining machine;

[0045] If the coal mining machine operator discovers an impact but fails to activate the coal mining machine stop switch in time, causing the coal mining machine to continue moving, the coal mining machine will push the guide rod 1 to further compress the buffer 3 and push the trigger 6 to approach the limit switch 7, triggering the limit switch 7 to send a feedback signal to the stop switch to close in conjunction with the stop switch, thus stopping the coal mining machine from continuing to move.

[0046] The initial distance between the front end of the rod 61 and the guide rod 1 is calculated and set according to the actual situation to ensure that the coal mining machine has enough braking time, to prevent the coal mining machine from derailing, and to protect the scraper conveyor from impact.

[0047] It is worth noting that the specific model of the proximity switch mentioned in this embodiment, as well as its matching power supply and control switch, can also be provided by the manufacturer. The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon.

[0048] This solution can be widely used not only for scraper conveyors in underground coal mine working faces, but also for limiting structures in equipment in other fields.

[0049] The parts not disclosed in this utility model are all prior art, and their specific structures and working principles will not be described in detail.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flexible limit protection device for a coal mining machine, characterized by: The utility model relates to a kind of buffer device of coal mining machine, including: Guide cylinder (2) is installed at the head or tail of blade conveyor; Guide rod (1) is inserted into guide cylinder (2) at the rear end; Buffering element (3) is located in guide cylinder (2) and is connected with the end of guide rod (1) inserted into guide cylinder (2), for providing elastic connection between the both; Trigger element (6) is slidingly installed at the rear end of guide cylinder (2), and the front end of trigger element (6) is close to buffering element (3), when no impact occurs, the rear end of guide rod (1) is away from the front end of trigger element (6), when impact occurs, the rear end of guide rod (1) first compresses buffering element (3) and then contacts with trigger element (6) and pushes trigger element (6) to move backward; Travel switch (7) is also installed at the rear end of guide cylinder (2) and is located at the rear side of trigger element (6), for detecting the interval between it and the rear end of trigger element (6).

2. The elastic position-limiting protection device of a coal mining machine according to claim 1, characterized in that: The travel switch (7) is also connected with the stop switch signal of coal mining machine, for feedback signal to the stop switch of coal mining machine to stop when detecting the interval between it and the rear side of trigger element (6) is reduced.

3. The elastic position-limiting protection device of a coal mining machine according to claim 1 or 2, characterized in that: The rear end of the guide cylinder (2) is open structure, a group of fixed pins (5) are installed through the rear side wall of the middle of the guide cylinder (2), the front end of the trigger element (6) is slidingly extended to the front side of the fixed pin (5) through the fixed pin (5). Meanwhile, the fixed pin (5) is located at the rear side of the buffering element (3).

4. The elastic position-limiting protection device of a coal mining machine according to claim 1, characterized in that: The front end of the guide rod (1) is fixedly connected with front plate (11).

5. The elastic position-limiting protection device of a coal mining machine according to claim 3, characterized in that: The buffering element (3) is spring.

6. The elastic position-limiting protection device of a coal mining machine according to claim 5, characterized in that: The front side of the fixed pin (5) is fixed with annular fixed block (4) in the guide cylinder (2), and the spring is connected between the annular fixed block (4) and the rear end of the guide rod (1).

7. The elastic position-limiting protection device of a coal mining machine according to claim 6, characterized in that: The front end of the trigger element (6) extends to the inner ring of the spring through the center hole of the annular fixed block (4).

8. The elastic position-limiting protection device of a coal mining machine according to claim 7, characterized in that: The diameter of the front end of the trigger element (6) is less than the diameter of the center hole of the annular fixed block (4).

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