An automatic cleaning device for the return belt of a mining belt conveyor

Abstract

The present application relates to the technical field of mining belt cleaning, and in particular to an automatic cleaning device for the return belt of a mining belt conveyor, comprising: a base, installed at the discharging end of the belt conveyor; a cleaning mechanism, installed on the base, comprising a primary cleaning component and a secondary cleaning component, the cleaning mechanism having a gentle mode and a strong mode, when the cleaning mechanism is in the gentle mode, the primary cleaning component is started, when the cleaning mechanism is in the strong mode, the primary cleaning component and the secondary cleaning component are started at the same time; a detection trigger component, installed on the base, for detecting dirt on the belt and controlling the start and stop of the secondary cleaning component. The present application has the effect of adjusting the cleaning method according to the degree of attachment of dirt on the belt.

Description

Technical Field

[0001] The present application relates to the technical field of mining belt cleaning, and in particular to an automatic cleaning device for a return belt of a mining belt conveyor. Background Art

[0002] Mining belt conveyors refer to belt conveyors used in the mining, production, transportation and processing of minerals such as coal. Mining belt conveyors have the characteristics of large transportation volume, complex working environment, strong carrying capacity, and long transportation distance. They are widely used in major mining areas in my country. Mining belt conveyors can be used not only in the process of mineral mining, but also in the process of mineral processing. In terms of energy consumption, mining belt conveyors can effectively reduce energy consumption and improve economic benefits. Compared with other modes of transportation such as automobiles, they can save energy and protect the environment. In addition, mining belt conveyors have the characteristics of small maintenance and simple maintenance, so they are also loved by mineral processing companies.

[0003] During the operation of the mining belt conveyor, it is inevitable that some dirt such as coal dust, mud and ore particles will adhere to the belt. If it is not cleaned in time, once the dirt accumulates, it will accelerate the wear of the belt, or even cut the belt. In addition to wearing the belt, it may also cause the belt to deviate and unstable conveying. The existing cleaning method uses a continuously rotating brush roller to brush the belt. Although it can remove the dirt, this cleaning method cannot be adjusted according to the degree of dirt adhesion on the belt, resulting in greater wear on the belt. Summary of the invention

[0004] In order to adjust the cleaning method according to the degree of dirt adhesion on the belt, the present application provides an automatic cleaning device for the return belt of a mining belt conveyor.

[0005] The present application provides an automatic cleaning device for the return belt of a mining belt conveyor, which adopts the following technical solution:

[0006] An automatic cleaning device for a return belt of a mining belt conveyor, comprising:

[0007] The base is installed at the discharge end of the belt conveyor;

[0008] A cleaning mechanism is installed on the base, and includes a primary cleaning component and a secondary cleaning component. The cleaning mechanism has a gentle mode and a strong mode. When the cleaning mechanism is in the gentle mode, the primary cleaning component is activated. When the cleaning mechanism is in the strong mode, the primary cleaning component and the secondary cleaning component are activated at the same time.

[0009] The detection trigger assembly is mounted on the base and is used to detect dirt on the belt and control the start and stop of the secondary cleaning assembly.

[0010] By adopting the above technical solution, combining the gentle mode and strong mode cleaning methods, and using the detection trigger component, the problem of excessive belt wear caused by a single cleaning method in the prior art is solved, and efficient and intelligent cleaning of belt dirt is achieved. By detecting the trigger component, intelligent detection and cleaning control of belt dirt can be achieved. This not only improves the cleaning efficiency and belt service life, but also reduces the cost of manual maintenance, providing a strong guarantee for the stable operation of mining belt conveyors.

[0011] Optionally, the primary cleaning component includes:

[0012] A workbench is arranged obliquely below the belt;

[0013] The nozzle is fixedly arranged on the workbench, and the water outlet faces the belt;

[0014] Air knife; fixedly set on the workbench, with the air outlet facing the belt;

[0015] The nozzle is arranged in front of the air knife so that the belt passes through the nozzle and the air knife in sequence.

[0016] By adopting the above technical solution, the nozzle sprays water to clean the dirt on the belt. The air knife blows away the residual water droplets and light dirt on the belt. The nozzle is arranged in front of the air knife, so that the belt passes through the nozzle and the air knife in sequence, thereby realizing the cleaning process of first spraying water for cleaning and then blowing air to remove water.

[0017] Optionally, a roller frame is fixedly arranged on the base above the workbench, and a pressure roller is rotatably arranged on the roller frame, and the pressure roller is against the upper surface of the belt.

[0018] By adopting the above technical solution, the roller frame can support the belt during the cleaning process, prevent the belt from jumping under the impact of water flow and air flow, and ensure that the belt can stably pass through the cleaning area of ​​the nozzle and the air knife.

[0019] Optionally, the secondary cleaning component includes:

[0020] Electric cylinder, the cylinder body is fixed to the base, and the piston rod is fixed to the workbench;

[0021] A cleaning roller is rotatably arranged on a workbench, wherein the cleaning roller is located between the nozzle and the air knife, and the top of the cleaning roller is higher than the tops of the nozzle and the air knife;

[0022] The motor is fixedly arranged on the workbench, and the output end is connected to the cleaning roller;

[0023] Wherein, when the cleaning mechanism is in the strong mode, the workbench rises and the cleaning roller abuts against the lower surface of the belt.

[0024] By adopting the above technical solution, when the cleaning mechanism is in the strong mode, the workbench rises, the cleaning roller will abut against the lower surface of the belt, and the motor drives the cleaning roller to rotate, thereby further strongly scrubbing the belt.

[0025] Optionally, the secondary cleaning component further includes:

[0026] A sleeve is fixedly arranged on the base;

[0027] A connecting rod, slidably disposed in the sleeve;

[0028] A pressure roller is rotatably arranged on the connecting rod, and the pressure roller is located directly above the cleaning roller;

[0029] A connecting rope, one end of which is fixed to the workbench and the other end is fixed to the connecting rod;

[0030] A pressure spring, both ends of which are fixed to the sleeve and the connecting rod respectively, and the pressure spring is always in a compressed state;

[0031] When the workbench is raised, the pressure roller is against the upper surface of the belt, and the connecting rope is in a relaxed state; when the workbench is lowered, the pressure roller and the belt are separated, and the connecting rope is in a tensioned state.

[0032] By adopting the above technical solution, when the workbench rises, the pressure roller abuts against the upper surface of the belt, forming an upper and lower clamping structure with the cleaning roller, pressing the belt against the cleaning roller, thereby improving the cleaning effect.

[0033] Optionally, a water stop is rotatably provided on the base, a driving member is fixedly provided on the workbench, and an elastic member for driving the water stop to press against the driving member is provided on the base. When the workbench is raised, the driving member drives the water stop to rotate in a direction close to the nozzle, so that the water stop presses against the water outlet of the nozzle and reduces the diameter of the water outlet.

[0034] By adopting the above technical solution, when the workbench rises, the driving member will drive the water retaining member to rotate in the direction close to the nozzle, so that the water retaining member is against the water outlet of the nozzle. The shielding of the water retaining member will reduce the diameter of the water outlet of the nozzle, thereby increasing the impact force of the water flow and enhancing the cleaning effect on the belt.

[0035] Optionally, the water blocking member and the driving member abut against each other to form a structure for blocking water from splashing to the outside of the workbench.

[0036] By adopting the above technical solution, water can be prevented from splashing outside the workbench, keeping the working environment clean and tidy.

[0037] Optionally, the elastic member is a torsion spring, and two ends of the torsion spring are respectively fixed to the base and the water retaining member.

[0038] By adopting the above technical solution, under the elastic force of the torsion spring, the water blocking member can be pressed tightly against the driving member, thereby improving the water blocking effect.

[0039] Optionally, a protrusion is fixedly provided on the water retaining member, and when the workbench is raised, the protrusion extends into the water outlet of the nozzle.

[0040] By adopting the above technical solution, the protrusion can extend into the water outlet of the nozzle, which can further reduce the diameter of the water outlet and increase the impact force of the water flow.

[0041] Optionally, the detection trigger component includes:

[0042] A damping rod is fixedly arranged on the base;

[0043] A rotating roller is rotatably arranged at the telescopic end of the damping rod;

[0044] A return spring, both ends of which are respectively fixed to the base and the telescopic end of the damping rod;

[0045] A displacement sensor is used to detect the thickness of dirt attached to the belt, and its two ends are respectively fixed to the base and the telescopic end of the damping rod;

[0046] A controller is fixedly arranged on the base;

[0047] Wherein, when the return spring is in a natural state, the roller is against the belt, and the controller is electrically connected to the displacement sensor, the electric cylinder and the motor.

[0048] By adopting the above technical solution, when the thickness of the dirt on the belt changes, it will push the roller up and down, thereby changing the telescopic length of the damping rod. The displacement sensor can sense this length change and convert it into an electrical signal and transmit it to the controller. The controller receives the electrical signal from the displacement sensor and determines the degree of dirt on the belt according to the preset logic. When the degree of dirt reaches or exceeds the set threshold, the controller will issue a control instruction to start the secondary cleaning component for strong cleaning. When the degree of dirt is lower than the set threshold, the controller controls the secondary cleaning component to remain closed and only the primary cleaning component is used for gentle cleaning.

[0049] In summary, the present application includes at least one of the following beneficial technical effects:

[0050] 1. By combining the gentle mode and the strong mode cleaning methods, and the application of the detection trigger component, the problem of excessive belt wear caused by a single cleaning method in the prior art is solved, and efficient and intelligent cleaning of belt dirt is achieved. By detecting the trigger component, intelligent detection and cleaning control of belt dirt can be achieved. This not only improves the cleaning efficiency and belt service life, but also reduces the labor maintenance cost, providing a strong guarantee for the stable operation of the mining belt conveyor.

[0051] 2. When the thickness of dirt on the belt changes, it will push the roller up and down, thereby changing the telescopic length of the damping rod. The displacement sensor can sense this length change and convert it into an electrical signal and transmit it to the controller. The controller receives the electrical signal from the displacement sensor and determines the degree of dirt on the belt according to the preset logic. When the degree of dirt reaches or exceeds the set threshold, the controller will issue a control command to start the secondary cleaning component for strong cleaning. When the degree of dirt is lower than the set threshold, the controller controls the secondary cleaning component to remain closed and only the primary cleaning component is used for gentle cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0053] Figure 2 It is a cross-sectional view of an embodiment of the present application.

[0054] Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A.

[0055] Figure 4 yes Figure 2 A partial enlarged schematic diagram of part B.

[0056] Figure numerals: 1. base; 21. workbench; 22. nozzle; 23. air knife; 24. collecting box; 31. roller frame; 32. pressure roller; 41. electric cylinder; 42. cleaning roller; 43. motor; 44. sleeve; 45. connecting rod; 46. pressure roller; 47. connecting rope; 48. pressure spring; 49. guide tube; 51. water retaining member; 511. protrusion; 52. driving member; 53. torsion spring; 61. damping rod; 62. rotating roller; 63. reset spring; 64. displacement sensor; 65. controller. DETAILED DESCRIPTION

[0057] The technical solution in this application is further described in detail below in conjunction with the accompanying drawings.

[0058] The present application embodiment discloses an automatic cleaning device for the return belt of a mining belt conveyor. Figure 1 and Figure 2 A mining belt conveyor return belt automatic cleaning device comprises a base 1, a cleaning mechanism and a detection trigger component.

[0059] The base 1 is installed at the discharge end of the belt conveyor to support the entire cleaning device. The cleaning mechanism is installed on the base 1, including a primary cleaning component and a secondary cleaning component. The cleaning mechanism has a gentle mode and a strong mode, and switches between different modes to adapt to different degrees of dirt cleaning needs. When the cleaning mechanism is in the gentle mode, only the primary cleaning component is started to preliminarily clean the dirt on the belt. When the cleaning mechanism is in the strong mode, the primary cleaning component and the secondary cleaning component are started at the same time to achieve comprehensive cleaning of the belt. The detection trigger component is installed on the base 1, which is used to detect the dirt on the belt in real time, and automatically control the start and stop of the secondary cleaning component according to the degree of dirt, to achieve intelligent management, thereby increasing the service life of the belt.

[0060] For details, please refer to Figure 2 and Figure 3 The first-level cleaning component includes a workbench 21, a nozzle 22, an air knife 23 and a collection box 24. The width of the workbench 21 is greater than the width of the belt, and the workbench 21 is tilted below the belt to facilitate the dirt washed off the workbench 21 to slide into the collection box 24. The nozzle 22 is fixedly arranged on the workbench 21, and the water outlet is facing the belt, and is used to spray water to clean the dirt on the belt. The air knife 23 is also fixedly arranged on the workbench 21, and the air outlet is facing the belt, and is used to blow away the residual water droplets and light dirt on the belt. The nozzle 22 is arranged in front of the air knife 23, so that the belt passes through the nozzle 22 and the air knife 23 in turn, thereby realizing the cleaning process of first spraying water for cleaning and then blowing air to remove water. The collection box 24 is located below the workbench 21, and is used to collect the dirt and sewage washed off, and keep the working environment clean. The two sides of the workbench 21 are fixedly provided with eaves, which play a role in blocking and guiding the sewage and dirt, so that the sewage and dirt are discharged into the collection box 24.

[0061] Please refer to Figure 1 and Figure 2 In order to further enhance the cleaning effect, a roller frame 31 is fixedly arranged above the workbench 21 on the base 1, and a plurality of pressure rollers 32 are rotatably arranged on the roller frame 31. The pressure rollers 32 are against the upper surface of the belt to support the belt during the cleaning process, prevent the belt from jumping under the impact of water flow and air flow, and ensure that the belt can stably pass through the cleaning area of ​​the nozzle 22 and the air knife 23.

[0062] Please refer to Figure 1 and Figure 2The secondary cleaning assembly includes an electric cylinder 41, a cleaning roller 42 and a motor 43. Among them, the cylinder body of the electric cylinder 41 is fixedly connected to the base 1, and the piston rod of the electric cylinder 41 is fixedly connected to the workbench 21. The workbench 21 can be driven to rise and fall by the extension and contraction of the piston rod of the electric cylinder 41. The cleaning roller 42 is rotatably arranged on the workbench 21, and the cleaning roller 42 is densely covered with bristles. The cleaning roller 42 is located between the nozzle 22 and the air knife 23. The top of the cleaning roller 42 is higher than the top of the nozzle 22 and the air knife 23. The motor 43 is fixedly arranged on the workbench 21, and the output shaft of the motor 43 is fixedly connected to the cleaning roller 42. The motor 43 is used to drive the cleaning roller 42 to rotate to enhance the cleaning effect. When the cleaning mechanism is in the strong mode, the workbench 21 rises, and the cleaning roller 42 will abut against the lower surface of the belt, thereby further strongly scrubbing the belt. At the same time, the rise of the workbench 21 will also make the nozzle 22 and the air knife 23 closer to the belt, thereby increasing the impact of the water flow and air flow on the belt and improving the cleaning effect.

[0063] In addition, please refer to Figure 1 and Figure 4 The secondary cleaning assembly also includes a sleeve 44, a connecting rod 45, a pressure roller 46, a connecting rope 47, a pressure spring 48 and a guide tube 49. Among them, the sleeve 44 is fixedly arranged on both sides of the base 1, and the connecting rod 45 is slidably arranged in the sleeve 44. The pressure roller 46 is rotatably arranged between the two connecting rods 45, and the pressure roller 46 is located directly above the cleaning roller 42. A gap for the belt to pass through is formed between the pressure roller 46 and the cleaning roller 42. When the workbench 21 is raised, the pressure roller 46 simultaneously presses against the upper surface of the belt, and forms an upper and lower clamping structure with the cleaning roller 42, pressing the belt against the cleaning roller 42, thereby improving the cleaning effect. One end of the connecting rope 47 is fixedly connected to the workbench 21, and the other end of the connecting rope 47 passes through the sleeve 44 and is fixedly connected to the connecting rod 45, which is used to realize the linkage between the connecting rod 45 and the workbench 21. The two ends of the pressure spring 48 are fixedly connected to the sleeve 44 and the connecting rod 45 respectively, and the pressure spring 48 is always in a compressed state, which is used to provide downward pressure for the pressure roller 46 to ensure that the pressure roller 46 can be tightly pressed against the belt in the strong mode. The connecting rope 47 passes through the guide tube 49 to limit the moving path of the connecting rope 47 to prevent the connecting rope 47 from being entangled with other components.

[0064] When the cleaning mechanism is in the strong mode, the workbench 21 rises, and the connecting rod 45 is further extended from the sleeve 44 under the action of the pressure spring 48, so that the pressure roller 46 is pressed against the upper surface of the belt, thereby pressing the belt against the cleaning roller 42. At this time, the connecting rope 47 is in a relaxed state, which can ensure that the expansion and contraction of the pressure spring 48 will not be restricted, thereby ensuring that the pressure spring 48 provides downward pressure on the pressure roller 46.

[0065] When the cleaning mechanism is in the gentle mode, the workbench 21 is lowered, and due to the traction of the connecting rope 47, the connecting rod 45 drives the pressure roller 46 to move upward, so that the pressure roller 46 is separated from the belt, and the pressure spring 48 is further compressed. At this time, the connecting rope 47 is in a tensioned state, which will limit the downward movement of the connecting rod 45, thereby ensuring the separation of the pressure roller 46 from the belt.

[0066] Please refer to Figure 3 In order to prevent water from splashing to the outside of the workbench 21 and keep the working environment clean, a water retaining member 51 is rotatably provided on the base 1, and the water retaining member 51 is arranged close to the belt. A driving member 52 is fixedly provided on the workbench 21, and the driving member 52 is located in front of the nozzle 22. An elastic member for driving the water retaining member 51 to abut against the driving member 52 is provided on the base 1, and the water retaining member 51 and the driving member 52 abut against each other to form a structure for blocking water from splashing to the outside of the workbench 21, so that when the water is washing the belt, the splashing water can be blocked by the water retaining member 51 and flow to the workbench 21 along the water retaining member 51 and the driving member 52. In the strong mode, when the workbench 21 is raised, the driving member 52 will drive the water retaining member 51 to rotate in the direction close to the nozzle 22, so that the water retaining member 51 abuts against the water outlet of the nozzle 22. Since the shielding of the water blocking member 51 reduces the diameter of the water outlet of the nozzle 22, the impact force of the water flow is increased, thereby enhancing the cleaning effect on the belt.

[0067] For details, please refer to Figure 3 In this embodiment, the elastic member is a torsion spring 53, one end of which is fixedly connected to the base 1, and the other end of which is fixedly connected to the water retaining member 51. Under the elastic force of the torsion spring 53, the water retaining member 51 can be pressed against the driving member 52, thereby improving the water retaining effect. When the workbench 21 is lowered, under the elastic force of the torsion spring 53, the water retaining member 51 will automatically return to the initial position for the next use.

[0068] Please refer to Figure 3 In order to further enhance the water blocking effect, a protrusion 511 is fixedly provided on the water blocking member 51. In the strong mode, when the water blocking member 51 is against the water outlet of the nozzle 22, the protrusion 511 can extend into the water outlet of the nozzle 22, which can further reduce the diameter of the water outlet and increase the impact force of the water flow.

[0069] Please refer to Figure 1 and Figure 2The detection trigger assembly includes a damping rod 61, a roller 62, a reset spring 63, a displacement sensor 64 and a controller 65. The damping rod 61 is fixedly arranged on both sides of the base 1, and the roller 62 is rotatably arranged between the telescopic ends of the two damping rods 61. One end of the reset spring 63 is fixedly connected to the base 1, and the other end of the reset spring 63 is fixedly connected to the telescopic end of the damping rod 61, so as to enable the roller 62 to automatically reset without external force. The displacement sensor 64 is used to detect the thickness of the dirt attached to the belt, and the two ends of the displacement sensor 64 are respectively fixed to the base 1 and the telescopic end of the damping rod 61. The controller 65 is fixedly arranged on the base 1, and is electrically connected to the displacement sensor 64, the electric cylinder 41 and the motor 43. The roller 62 is arranged in front of the nozzle 22, so that the detection trigger assembly determines whether the secondary cleaning assembly is started after detecting the belt.

[0070] When the return spring 63 is in a natural state, the roller 62 is against the belt. When there is dirt on the belt, the dirt will push the roller 62 downward, thereby compressing the damping rod 61 and the return spring 63, and then changing the telescopic length of the damping rod 61. The displacement sensor 64 can sense this displacement change and transmit the displacement signal to the controller 65. After receiving the displacement signal, the controller 65 will judge the thickness of the dirt according to the preset threshold value, and control the start of the secondary cleaning component accordingly. Specifically, when the thickness of the dirt exceeds the preset threshold value, the controller 65 controls the electric cylinder 41 to start, drives the workbench 21 to rise, and starts the motor 43 at the same time to rotate the cleaning roller 42, thereby entering the strong cleaning mode. When the thickness of the dirt is lower than the preset threshold value, the controller 65 will not start the electric cylinder 41 and the motor 43, so that the cleaning mechanism remains in the gentle cleaning mode to avoid unnecessary wear on the belt.

[0071] The implementation principle of the embodiment of the present application is as follows: in the gentle mode, only the first-stage cleaning component is started, at which time the electric cylinder 41 does not work, the workbench 21 is in a lowered state, and the cleaning roller 42 and the pressure roller 46 are separated from the belt. The water flow sprayed by the nozzle 22 and the air flow blown by the air knife 23 clean and dry the belt in turn, while the pressure roller 32 ensures that the belt remains stable during the cleaning process.

[0072] In the strong mode, when the detection trigger component detects that the thickness of the dirt on the belt exceeds the preset threshold, the controller 65 will start the electric cylinder 41 and the motor 43 to start the secondary cleaning component. At this time, the workbench 21 rises, and the cleaning roller 42 and the pressure roller 46 are respectively against the lower surface and the upper surface of the belt, and the cleaning roller 42 brushes the belt. The nozzle 22 sprays a more impactful water flow under the reduced water outlet diameter, which combines with the cleaning roller 42 to completely remove the stubborn dirt on the belt. After the cleaning is completed, the strong mode ends automatically.

[0073] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatic cleaning device for the return belt of a mining belt conveyor, characterized in that: include: A base (1) is mounted on the discharge end of the belt conveyor; A cleaning mechanism, mounted on a base (1), comprising a primary cleaning component and a secondary cleaning component, the cleaning mechanism having a gentle mode and a strong mode, wherein when the cleaning mechanism is in the gentle mode, the primary cleaning component is activated, and when the cleaning mechanism is in the strong mode, the primary cleaning component and the secondary cleaning component are activated simultaneously; A detection trigger component, mounted on the base (1), used to detect dirt on the belt and control the start and stop of the secondary cleaning component; The primary cleaning component comprises: A workbench (21) is arranged obliquely below the belt; A nozzle (22) is fixedly mounted on the workbench (21) with a water outlet facing the belt; An air knife (23) is fixedly arranged on the workbench (21) with an air outlet facing the belt; Wherein, the nozzle (22) is arranged in front of the air knife (23), so that the belt passes through the nozzle (22) and the air knife (23) in sequence; A roller frame (31) is fixedly arranged on the base (1) above the workbench (21), a pressure roller (32) is rotatably arranged on the roller frame (31), and the pressure roller (32) abuts against the upper surface of the belt; The secondary cleaning component includes: The electric cylinder (41) has a cylinder body fixed to a base (1) and a piston rod fixed to a workbench (21); A cleaning roller (42) is rotatably disposed on the workbench (21), wherein the cleaning roller (42) is located between the nozzle (22) and the air knife (23), and the top end of the cleaning roller (42) is higher than the top ends of the nozzle (22) and the air knife (23); A motor (43) is fixedly mounted on the workbench (21), and an output end thereof is connected to the cleaning roller (42); Wherein, when the cleaning mechanism is in a strong mode, the workbench (21) rises and the cleaning roller (42) abuts against the lower surface of the belt; The secondary cleaning component also includes: A sleeve (44) is fixedly mounted on the base (1); A connecting rod (45) slidably disposed in the sleeve (44); A pressure roller (46) is rotatably mounted on the connecting rod (45), wherein the pressure roller (46) is located directly above the cleaning roller (42); A connecting rope (47), one end of which is fixed to the workbench (21) and the other end of which is fixed to the connecting rod (45); A pressure spring (48), both ends of which are respectively fixed to the sleeve (44) and the connecting rod (45), and the pressure spring (48) is always in a compressed state; When the workbench (21) is raised, the pressure roller (46) is against the upper surface of the belt, and the connecting rope (47) is in a relaxed state; when the workbench (21) is lowered, the pressure roller (46) and the belt are separated, and the connecting rope (47) is in a tensioned state.

2. The automatic cleaning device for the return belt of a mining belt conveyor according to claim 1 is characterized in that: A water retaining member (51) is rotatably provided on the base (1), a driving member (52) is fixedly provided on the workbench (21), and an elastic member for driving the water retaining member (51) to abut against the driving member (52) is provided on the base (1); when the workbench (21) is raised, the driving member (52) drives the water retaining member (51) to rotate in a direction close to the nozzle (22), so that the water retaining member (51) abuts against the water outlet of the nozzle (22) and reduces the diameter of the water outlet.

3. The automatic cleaning device for the return belt of a mining belt conveyor according to claim 2 is characterized in that: The water blocking member (51) and the driving member (52) abut against each other to form a structure for blocking water from splashing to the outside of the workbench (21).

4. The automatic cleaning device for the return belt of a mining belt conveyor according to claim 2 is characterized in that: The elastic member is a torsion spring (53), and two ends of the torsion spring (53) are respectively fixed to the base (1) and the water retaining member (51).

5. The automatic cleaning device for the return belt of a mining belt conveyor according to claim 2 is characterized in that: A protrusion (511) is fixedly provided on the water retaining member (51), and when the workbench (21) is raised, the protrusion (511) extends into the water outlet of the nozzle (22).

6. The automatic cleaning device for the return belt of a mining belt conveyor according to claim 1 is characterized in that: The detection trigger component comprises: A damping rod (61) is fixedly mounted on the base (1); A rotating roller (62) rotatably disposed on the telescopic end of the damping rod (61); A return spring (63), both ends of which are respectively fixed to the base (1) and the telescopic end of the damping rod (61); A displacement sensor (64) is used to detect the thickness of dirt attached to the belt, and its two ends are respectively fixed to the base (1) and the telescopic end of the damping rod (61); A controller (65) fixedly mounted on the base (1); When the return spring (63) is in a natural state, the roller (62) abuts against the belt, and the controller (65) is electrically connected to the displacement sensor (64), the electric cylinder (41), and the motor (43).

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