Wear detection device for coal mining machine

Abstract

The invention belongs to the technical field of abrasion detection, and particularly relates to a coal mining machine abrasion detection device which comprises an annular medium bin, annular transparent tempered glass is fixedly embedded in the inner side wall of the annular medium bin, the coal mining machine abrasion detection device further comprises a fixing frame, a first motor is fixedly arranged at the top of the fixing frame, and a second motor is fixedly arranged at the bottom of the fixing frame. A first rotating rod and a second rotating rod which extend towards the two sides are fixedly arranged at the upper end of an output shaft of the first motor, and the tail end of the first rotating rod and the tail end of the second rotating rod extend into the two sides of the annular medium bin correspondingly. According to the invention, the real coal mining working condition can be accurately simulated, the cutting pick can complete wear detection in an environment close to actual operation, meanwhile, a fresh medium can be continuously supplemented, detection distortion caused by medium breakage is avoided, the height of the medium can be monitored in real time, linked material supplementing can be realized, stable cutting conditions can be maintained, and the authenticity and precision of wear detection can be guaranteed; and a reliable basis is provided for wear resistance evaluation of the cutting pick.

Description

Technical Field

[0001] This invention belongs to the field of wear detection technology, and in particular relates to a wear detection device for a coal mining machine. Background Technology

[0002] As the core equipment in coal mining operations, the working efficiency and operational stability of coal mining machines directly affect the production capacity and safety of coal mining. As a key actuating component that directly contacts the coal in the coal mining machine, the cutting teeth must withstand continuous squeezing, impact and friction during the coal cutting process. It is the most severely worn and vulnerable part on the coal mining machine. Therefore, it is crucial to accurately test the wear performance of the cutting teeth before they are put into actual use, such as the coal mining machine wear detection device and method disclosed in announcement number CN118243553A.

[0003] Currently, to simulate the complex underground coal mining conditions, existing cutting tooth wear detection devices typically use specific media (such as sand, gravel, coal and rock particles simulating coal) to construct the detection environment. By driving the cutting teeth to rotate and cut the media, the cutting behavior in the actual coal mining process is simulated, thereby evaluating the wear resistance of the cutting teeth. However, during the detection process, as the cutting teeth continue to cut, the simulated media is continuously broken and refined. The media, which was originally similar to the physical properties of fresh coal (such as particle shape and structural density), gradually transforms into fine particles or dust. These broken media can no longer restore the original state of fresh coal, resulting in a significant difference between the objects subsequently cut by the cutting teeth and the actual working conditions of fresh coal underground (the gaps between the broken media particles are reduced and the degree of densification is increased, causing the mechanical properties such as cutting resistance and impact load borne by the cutting teeth to deviate from the actual coal mining scenario).

[0004] Therefore, a wear detection device for coal mining machines is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a wear detection device for coal mining machines.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a coal mining machine wear detection device, comprising an annular media chamber, wherein an annular transparent tempered glass is fixedly embedded in the inner wall of the annular media chamber, and further comprising: A fixed frame is fixedly installed inside the annular media chamber. A first motor is fixedly installed on the top of the fixed frame. A first rotating rod and a second rotating rod extending to both sides are fixedly installed on the upper end of the output shaft of the first motor. The ends of the first rotating rod and the ends of the second rotating rod extend to the inside of both sides of the annular media chamber, respectively. A rotating mechanism is disposed at the end of the first rotating rod, and the rotating mechanism rotates inside the annular medium chamber via the first rotating rod; A feeding mechanism is located at the end of the second rotating rod, and the feeding mechanism rotates inside the annular medium chamber via the second rotating rod to replenish the medium; A height detection mechanism is installed on the output shaft of the first motor. The detection end of the height detection mechanism faces the annular transparent tempered glass, and the height detection mechanism is used to detect the height of the medium inside the annular medium chamber. A spreading mechanism is disposed on one side of the feeding mechanism, and the spreading mechanism rotates inside the annular medium chamber via the second rotating rod to spread the medium evenly; The PLC controller is fixedly mounted on the side wall of the annular media chamber. The first motor, the rotating mechanism, and the height detection mechanism are all electrically connected to the PLC controller.

[0007] Preferably, the rotating mechanism includes an electric push rod fixedly disposed at the end of the first rotating rod. A U-shaped plate is fixedly disposed at the moving end of the electric push rod. A roller is disposed inside the U-shaped plate. A rotating shaft is fixedly disposed at the center of the roller, and the two ends of the rotating shaft are respectively rotatably connected to the inner walls of the two sides of the U-shaped plate. A plurality of evenly distributed fixed seats are fixedly disposed on the cylinder wall of the roller. Cutting teeth are fixedly installed inside the plurality of fixed seats. An L-shaped plate is fixedly disposed on the outer side wall of the U-shaped plate. A second motor is fixedly disposed on the side wall of the L-shaped plate. A torque detection mechanism is disposed between the output shaft of the second motor and one end of the rotating shaft.

[0008] Preferably, the torque detection mechanism includes a torque sensor located between the output shaft of the second motor and the rotating shaft, and the mounting part of the torque sensor is fixedly connected to the outer wall of the U-shaped plate, and the outer wall of the U-shaped plate is fixedly provided with a protective cover to cover the torque sensor.

[0009] Preferably, the feeding mechanism includes a fixed sleeve fixedly disposed at the end of the second rotating rod, and a multi-head feeding tube extending into the annular medium chamber is fixedly disposed inside the fixed sleeve.

[0010] Preferably, the upper end of the multi-head feeding pipe is provided with a feeding pipe, and one end of the feeding pipe is rotatably connected to the upper end of the multi-head feeding pipe through a pipe joint.

[0011] Preferably, the height detection mechanism includes a mounting rod that is horizontally fixed on the output shaft of the first motor, and a mounting plate that is vertically fixed at the end of the mounting rod. A plurality of uniformly distributed laser sensors are fixed on the side of the mounting plate facing the annular transparent tempered glass.

[0012] Preferably, the tiling mechanism includes an L-shaped fixing rod fixedly disposed on the side wall of the fixing sleeve, a connecting rod being movably inserted into the downward end of the L-shaped fixing rod, a spring being fixedly disposed between the upper end of the connecting rod and the inner wall of the L-shaped fixing rod, and a tiling plate being fixedly disposed at the lower end of the connecting rod at an incline.

[0013] Preferably, the downward-facing end of the L-shaped fixing rod has a square opening, and the connecting rod is a square rod that matches the square opening.

[0014] Compared with existing technologies, the advantages of this invention are as follows: 1. The first motor, first rotating rod, and rotating mechanism enable the cutting teeth to revolve within the annular media chamber. Combined with the rotation of the drum, this simulates the continuous cutting of new coal seams during actual coal mining. Simultaneously, a torque sensor between the output shaft of the second motor and the rotating shaft captures torque changes during the cutting process in real time. By combining operational simulation with precise torque monitoring, the wear status of the cutting teeth can be determined through torque fluctuations, making wear detection more consistent with actual operational logic and improving the reliability of detection results.

[0015] 2. Through the feeding mechanism, driven by the first motor, the feeding mechanism evenly distributes material in the annular medium chamber, which can continuously replenish the cutting teeth with fresh simulated medium. This avoids the original medium from deviating from the physical properties of fresh coal due to continuous cutting, crushing, and densification, ensuring that the cutting teeth always operate in a medium environment that conforms to the actual coal mining conditions, and providing a stable basis for wear detection.

[0016] 3. Through the height detection mechanism, when the height detection mechanism is driven to rotate by the first motor, it can comprehensively monitor the medium height in different areas of the annular medium chamber. At the same time, it is linked with the feeding mechanism. When the medium height is detected to be lower than the preset standard, the feeding action can be triggered in time to avoid abnormal cutting depth of the cutting teeth due to insufficient medium height, maintain stable cutting resistance, further ensure the accuracy of wear detection, and ensure that the entire detection process proceeds under controllable and consistent working conditions. Attached Figure Description

[0017] Figure 1 This is a first-view perspective perspective view of a coal mining machine wear detection device provided by the present invention; Figure 2 This is a second-view perspective perspective view of a coal mining machine wear detection device provided by the present invention; Figure 3 This is a three-dimensional view of a coal mining machine wear detection device provided by the present invention after being cut open; Figure 4 This is a perspective view of the rotating mechanism in a coal mining machine wear detection device provided by the present invention; Figure 5This is a perspective view of the height detection mechanism in a coal mining machine wear detection device provided by the present invention; Figure 6 This is a perspective view of the feeding mechanism and the flattening mechanism in a coal mining machine wear detection device provided by the present invention.

[0018] In the diagram: 1. Annular media chamber; 2. Annular transparent tempered glass; 3. Fixing frame; 4. First motor; 5. First rotating rod; 6. Second rotating rod; 7. Rotating mechanism; 71. Electric push rod; 72. U-shaped plate; 73. Roller; 74. Rotating shaft; 75. Fixing seat; 76. Cutting tooth; 77. L-shaped plate; 78. Second motor; 79. Torque detection mechanism; 791. Torque sensor; 792. Protective cover; 8. Feeding mechanism; 81. Fixing sleeve; 82. Multi-head feeding pipe; 83. Feeding pipe; 84. Pipe joint; 9. Height detection mechanism; 91. Mounting rod; 92. Mounting plate; 93. Laser sensor; 10. Laying mechanism; 101. L-shaped fixing rod; 102. Connecting rod; 103. Spring; 104. Laying plate; 11. PLC controller. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] like Figures 1-6 As shown, a wear detection device for a coal mining machine includes an annular media chamber 1. An annular transparent tempered glass 2 is fixedly embedded in the inner wall of the annular media chamber 1. The tempered glass has strong wear resistance and can significantly reduce the probability of being scratched by the media. The device also includes: A fixed frame 3 is fixedly installed inside the annular medium chamber 1. A first motor 4 is fixedly installed on the top of the fixed frame 3. A first rotating rod 5 and a second rotating rod 6 extending to both sides are fixedly installed on the upper end of the output shaft of the first motor 4. The ends of the first rotating rod 5 and the second rotating rod 6 extend into the interior of both sides of the annular medium chamber 1, respectively. When the first motor 4 is running, it can synchronously drive the first rotating rod 5 and the second rotating rod 6 to rotate, so that the ends of the first rotating rod 5 and the second rotating rod 6 move inside the annular medium chamber 1.

[0021] A rotating mechanism 7 is located at the end of the first rotating rod 5, and the rotating mechanism 7 rotates inside the annular medium chamber 1 via the first rotating rod 5. The rotating mechanism 7 includes an electric push rod 71 fixedly located at the end of the first rotating rod 5. A U-shaped plate 72 is fixedly provided at the moving end of the electric push rod 71. A roller 73 is provided inside the U-shaped plate 72. A rotating shaft 74 is fixedly provided at the center of the roller 73, and the two ends of the rotating shaft 74 are rotatably connected to the inner walls of the two sides of the U-shaped plate 72, respectively. A plurality of evenly distributed fixed seats 75 are fixedly provided on the cylinder wall of the roller 73. Cutting teeth 76 are fixedly installed inside the plurality of fixed seats 75 (the side wall of the fixed seat 75 is provided with bolts to lock the cutting teeth 76, not shown in the figure). An L-shaped plate 77 is fixedly provided on the outer side wall of the U-shaped plate 72. A second motor 78 is fixedly installed on the side wall of the L-shaped plate 77. A torque detection mechanism 79 is provided between the output shaft of the second motor 78 and one end of the rotating shaft 74. The torque detection mechanism 79 includes a torque sensor 791 located between the output shaft of the second motor 78 and the rotating shaft 74. The mounting part of the torque sensor 791 is fixedly connected to the outer side wall of the U-shaped plate 72. A protective cover 792 is fixedly installed on the outer side wall of the U-shaped plate 72 to cover the torque sensor 791. The protective cover 792 can protect the torque sensor 791. After the second motor 78 is started, power is transmitted through the input end of the torque sensor 791, driving the rotating end of the torque sensor 791 and the rotating shaft 74 to rotate, thereby driving the roller 73 and the cutting teeth 76 to rotate for cutting operations.

[0022] The replenishing mechanism 8 is located at the end of the second rotating rod 6, and the replenishing mechanism 8 rotates inside the annular medium chamber 1 via the second rotating rod 6 to replenish the medium. The replenishing mechanism 8 includes a fixed sleeve 81 fixedly located at the end of the second rotating rod 6. A multi-head replenishing pipe 82 extending into the annular medium chamber 1 is fixedly located inside the fixed sleeve 81. A feeding pipe 83 is provided at the upper end of the multi-head replenishing pipe 82. One end of the feeding pipe 83 is rotatably connected to the upper end of the multi-head replenishing pipe 82 via a pipe joint 84. One end of the feeding pipe 83 is connected to an external medium supply device. The design of the pipe joint 84 allows the feeding pipe 83 and the multi-head replenishing pipe 82 to rotate in a sealed manner, preventing the multi-head replenishing pipe 82 from tangling with the feeding pipe 83 during rotation.

[0023] A height detection mechanism 9 is mounted on the output shaft of the first motor 4. The detection end of the height detection mechanism 9 faces the annular transparent tempered glass 2, and the height detection mechanism 9 is used to detect the height of the medium inside the annular medium chamber 1. The height detection mechanism 9 includes a mounting rod 91 that is horizontally fixed on the output shaft of the first motor 4. A mounting plate 92 is vertically fixed at the end of the mounting rod 91. A plurality of uniformly distributed laser sensors 93 are fixed on the side of the mounting plate 92 facing the annular transparent tempered glass 2. A battery (not shown in the figure) is provided on the top of the U-shaped plate 72 to provide power support for the rotation mechanism 7 and the height detection mechanism 9.

[0024] A spreading mechanism 10 is located on one side of the feeding mechanism 8. The spreading mechanism 10 rotates inside the annular medium chamber 1 via a second rotating rod 6 to spread the medium evenly. The spreading mechanism 10 includes an L-shaped fixing rod 101 fixedly mounted on the side wall of the fixing sleeve 81. A connecting rod 102 is movably inserted into the downward end of the L-shaped fixing rod 101. A spring 103 is fixed between the upper end of the connecting rod 102 and the inner wall of the L-shaped fixing rod 101. A spreading plate 104 is obliquely fixed to the lower end of the connecting rod 102. The spreading plate 104 is a bent plate and includes an inclined part and a vertical part. The inclined part is in contact with the surface of the medium. A square opening is provided at the downward end of the L-shaped fixing rod 101. The connecting rod 102 is a square rod that matches the square opening. The square structure design prevents the connecting rod 102 from rotating inside the lower end of the L-shaped fixing rod 101, increasing the stability of the connecting rod 102's up-and-down movement.

[0025] The PLC controller 11 is fixedly installed on the side wall of the annular media chamber 1. The first motor 4, the rotating mechanism 7 and the height detection mechanism 9 are all electrically connected to the PLC controller 11.

[0026] The operating principle of the present invention is described as follows: First, the operator installs the multiple cutting teeth 76 to be tested on the multiple fixed seats 75 of the roller 73 (the cutting teeth 76 and the fixed seats 75 are locked together with bolts) to ensure that the installation is firm. Then, the PLC controller 11 starts the first motor 4 and the medium feeding device connected to the feeding pipe 83. The medium is transported to the inside of the multi-head feeding pipe 82 through the feeding pipe 83, and then evenly introduced into the annular medium bin 1 through the multiple outlets at the lower end of the multi-head feeding pipe 82. At the same time, the first motor 4 drives the second rotating rod 6 to rotate, thereby driving the multi-head feeding pipe 82 to rotate and spread the medium in the annular medium bin 1. This rotating feeding method, together with the flat plate 104 set on one side of the multi-head feeding pipe 82, can automatically spread the medium evenly on the bottom of the annular medium bin 1 during the spreading process, laying the foundation for subsequent uniform spreading. As the medium is continuously poured into the annular medium chamber 1, its height gradually increases. At this time, the flat plate 104 will be pushed upward by the medium and compressed by the connecting rod 102 to the spring 103 at its upper end, so that the flat plate 104 can adapt to different medium heights and always maintain contact with the medium surface, ensuring that the medium is continuously and effectively flattened. While the multi-head feeding pipe 82 is rotating and flattening, the output shaft of the first motor 4 will also drive the mounting rod 91 and the multiple laser sensors 93 on its end mounting plate 92 to rotate synchronously. The laser beams emitted by these laser sensors 93 penetrate the annular transparent tempered glass 2 of the wall of the annular medium chamber 1 and irradiate the internal medium surface of the annular medium chamber 1. The laser sensors 93 measure the time difference (or phase difference) between the laser emission and the return after reflection from the medium surface, and accurately calculate the distance from the laser sensor 93 to the medium surface according to the preset light speed. Combined with the fixed distance between the installation positions of multiple laser sensors 93 and the annular medium chamber 1, the PLC controller 11 can calculate the real-time height of the medium. When the laser sensor 93 detects that the medium height has reached a preset threshold, it sends an electrical signal to the PLC controller 11. Upon receiving the signal, the PLC controller 11 immediately stops the external medium feeding device and starts the second motor 78 to prepare for the wear detection process. The second motor 78 drives the rotating shaft 74 to rotate, which in turn drives the roller 73 on the rotating shaft 74 and the multiple cutting teeth 76 installed on the roller 73 to rotate at high speed. At the same time, the PLC controller 11 activates the electric push rod 71, controlling its piston rod to extend, driving the entire roller 73 to move downward, inserting the bottom of the roller 73 along with the cutting teeth 76 into the medium. A depth is set, for example, 1 / 3 to 1 / 2 of the diameter of the drum 73, to ensure that the cutting teeth 76 can effectively cut the medium. As the drum 73 and the cutting teeth 76 on its wall rotate in the medium, they continuously crush and cut the medium. During this process, the first motor 4 will continue to operate, driving the electric push rod 71 and the drum 73 at its moving end to slowly revolve in the annular medium chamber 1 through the first rotating rod 5. This allows the drum 73 and the cutting teeth 76 to move along the trajectory of the annular medium chamber 1, thereby continuously contacting the fresh, uncut medium, simulating the working condition of the cutting teeth 76 continuously cutting into the new coal body during the actual coal mining process. During the simulation testing process, in order to monitor the wear condition of the cutting teeth 76 in real time, a torque sensor 791 is connected in series between the output shaft of the second motor 78 and the rotating shaft 74 of the drive drum 73. When the second motor 78 starts, its output torque is transmitted through the input end of the torque sensor 791, driving the rotating end of the torque sensor 791 to rotate, which in turn drives the drum 73 and the cutting teeth 76 to rotate for cutting operations. The core function of the torque sensor 791 is to measure the real-time torque value transmitted from the output shaft of the second motor 78 to the drum 73. As the cutting teeth 76 gradually wear during the cutting process, their cutting edges become blunt, the contact area with the medium increases, and the cutting resistance increases. This change is directly reflected in the increase in torque required to drive the roller 73 to rotate. The torque sensor 791 can keenly capture this torque change and convert it into a standard electrical signal, which is transmitted to the PLC controller 11 in real time. The PLC controller 11 analyzes and processes the received electrical signal according to the preset torque threshold or torque change rate algorithm. When the detected torque value continues to rise and exceeds the set warning threshold, the PLC controller 11 can determine that the cutting tooth 76 has reached a certain degree of wear. During this process, the built-in timer of the PLC controller 11 will calculate the working time of the cutting tooth 76, providing key time dimension data support for subsequent analysis of the wear rate and wear resistance of the cutting tooth 76. As wear detection continues, the medium in the annular medium chamber 1 is continuously broken and refined under the rotating cutting of the cutting tooth 76. These broken fine particles fill the gaps between the original medium, resulting in an increase in the overall packing density of the medium. This manifests as a gradual decrease in the height of the medium layer. When the laser sensor 93 detects that the medium height has decreased to the preset lower threshold, it immediately sends a trigger signal to the PLC controller 11. After receiving the signal, the PLC controller 11 starts the external medium feeding device, which delivers fresh simulated medium through the feeding pipe 83 to the multi-head feeding pipe 82, which rotates and spreads it evenly in the annular medium chamber 1 to replenish the consumed and compacted medium, maintain the freshness and working condition consistency of the simulated medium, ensure that the cutting depth of the cutting tooth 76 remains stable, avoid abnormal cutting resistance caused by the crushing and densification of the medium, thereby stabilizing the torque detection signal and effectively improving the accuracy of wear detection of the cutting tooth 76. During the feeding process, as fresh medium is added, the medium height in the annular medium chamber 1 gradually increases. In order to ensure that the cutting teeth 76 always work at the set cutting depth, the PLC controller 11 will synchronously control the electric push rod 71 to retract appropriately, driving the roller 73 to move upward. This allows the immersion depth of the bottom of the roller 73 and the cutting teeth 76 in the medium to be adjusted in real time and kept constant, thereby ensuring the accuracy and consistency of the cutting resistance and torque detection, and ensuring that the entire wear test is carried out under a stable and repeatable working condition.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wear detection device for a coal mining machine, comprising an annular media chamber (1), wherein an annular transparent tempered glass (2) is fixedly embedded in the inner wall of the annular media chamber (1), characterized in that, Also includes: A fixed frame (3) is fixedly installed inside the annular medium chamber (1). A first motor (4) is fixedly installed on the top of the fixed frame (3). A first rotating rod (5) and a second rotating rod (6) extending to both sides are fixedly installed on the upper end of the output shaft of the first motor (4). The ends of the first rotating rod (5) and the second rotating rod (6) extend to the interior of both sides of the annular medium chamber (1). A rotating mechanism (7) is disposed at the end of the first rotating rod (5), and the rotating mechanism (7) rotates inside the annular medium chamber (1) via the first rotating rod (5); The feeding mechanism (8) is located at the end of the second rotating rod (6), and the feeding mechanism (8) rotates inside the annular medium chamber (1) and replenishes the medium via the second rotating rod (6); A height detection mechanism (9) is set on the output shaft of the first motor (4). The detection end of the height detection mechanism (9) is set towards the annular transparent tempered glass (2), and the height detection mechanism (9) is used to detect the height of the medium inside the annular medium chamber (1). A spreading mechanism (10) is provided on one side of the feeding mechanism (8), and the spreading mechanism (10) rotates inside the annular medium chamber (1) through the second rotating rod (6) and spreads the medium. The PLC controller (11) is fixedly installed on the side wall of the annular media chamber (1). The first motor (4), the rotating mechanism (7) and the height detection mechanism (9) are all electrically connected to the PLC controller (11).

2. The wear detection device for a coal mining machine according to claim 1, characterized in that, The rotating mechanism (7) includes an electric push rod (71) fixedly installed at the end of the first rotating rod (5). The moving end of the electric push rod (71) is fixedly provided with a U-shaped plate (72). The U-shaped plate (72) is provided with a roller (73) inside. The center of the roller (73) is fixedly provided with a rotating shaft (74), and the two ends of the rotating shaft (74) are respectively rotatably connected to the inner walls of the two sides of the U-shaped plate (72). The cylinder wall of the roller (73) is fixedly provided with a plurality of evenly distributed fixed seats (75). The interior of the plurality of fixed seats (75) is fixedly installed with cutting teeth (76). The outer side wall of the U-shaped plate (72) is fixedly provided with an L-shaped plate (77). The side wall of the L-shaped plate (77) is fixedly provided with a second motor (78). The output shaft of the second motor (78) is provided with a torque detection mechanism (79) between one end of the rotating shaft (74).

3. The wear detection device for a coal mining machine according to claim 2, characterized in that, The torque detection mechanism (79) includes a torque sensor (791) located between the output shaft of the second motor (78) and the rotating shaft (74), and the mounting part of the torque sensor (791) is fixedly connected to the outer wall of the U-shaped plate (72), and the outer wall of the U-shaped plate (72) is fixedly provided with a protective cover (792) covering the torque sensor (791).

4. The wear detection device for a coal mining machine according to claim 1, characterized in that, The feeding mechanism (8) includes a fixed sleeve (81) fixedly disposed at the end of the second rotating rod (6), and a multi-head feeding tube (82) extending into the annular medium chamber (1) is fixedly disposed inside the fixed sleeve (81).

5. The wear detection device for a coal mining machine according to claim 4, characterized in that, The upper end of the multi-head feeding pipe (82) is provided with a feeding pipe (83), and one end of the feeding pipe (83) is rotatably connected to the upper end of the multi-head feeding pipe (82) through a pipe joint (84).

6. The wear detection device for a coal mining machine according to claim 1, characterized in that, The height detection mechanism (9) includes a mounting rod (91) that is horizontally fixed on the output shaft of the first motor (4). The end of the mounting rod (91) is vertically fixed with a mounting plate (92). Multiple uniformly distributed laser sensors (93) are fixed on the side of the mounting plate (92) facing the annular transparent tempered glass (2).

7. The wear detection device for a coal mining machine according to claim 4, characterized in that, The tiling mechanism (10) includes an L-shaped fixing rod (101) fixedly installed on the side wall of the fixing sleeve (81). A connecting rod (102) is movably inserted into the lower end of the L-shaped fixing rod (101). A spring (103) is fixed between the upper end of the connecting rod (102) and the inner wall of the L-shaped fixing rod (101). A tiling plate (104) is fixedly installed at the lower end of the connecting rod (102).

8. The wear detection device for a coal mining machine according to claim 7, characterized in that, The L-shaped fixing rod (101) has a square opening at the downward end, and the connecting rod (102) is a square rod that matches the square opening.

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