Automatic coal sampling device for chute

Abstract

This application provides an automatic coal sampling device for a chute, comprising: a sampling chute, a sampling flap, a sampling flap shaft, a fork, a sample receiving bucket, an electro-hydraulic actuator, a limit switch, and an electrical control box; the sampling chute is located outside the non-coal receiving face opening on the chute; the sampling flap shaft is sleeved with bushings on both sides of the chute; the sample receiving bucket is located directly below the material discharge pipe of the sampling chute; the sampling flap is fixedly connected to the sampling flap shaft, and the fork is fixedly connected to one end of the sampling flap shaft to form a sampling flap assembly; the electro-hydraulic actuator is mounted on a base connected to the chute, and the piston rod U-shaped opening of the electro-hydraulic actuator is hinged to the fork for rotating the sampling flap assembly; the limit switch is located at the end of the stroke of the electro-hydraulic actuator, and the electrical control box is communicatively connected to the electro-hydraulic actuator to solve the problem of the inability to automate coal sampling operations in chutes.

Description

Technical Field

[0001] This application relates to the field of coal washing equipment technology, and in particular to an automatic coal sampling device for a chute. Background Technology

[0002] In the coal washing and processing production process, dynamic sampling of the coal flow on operating equipment such as belt conveyors and desliming screens is required. To obtain representative and uniform coal samples, the sampling operation needs to cover multiple spatial distribution points across the coal flow cross-section.

[0003] To meet the above sampling requirements, the relevant technology employs an eight-point sampling method: partial samples are taken at different time points and spatial locations in the continuous coal flow, and finally combined into a comprehensive sample. This method requires operators to repeatedly approach high-speed rotating mechanical equipment to perform sampling actions.

[0004] However, this type of manual sampling method has significant limitations: firstly, operators are exposed to the mechanical risks of high-speed moving parts for extended periods; secondly, to meet the requirements of spatially distributed sampling, high-frequency repetitive operations are necessary, leading to a significant increase in labor intensity. Therefore, there is an urgent need to develop a technical solution that can achieve remote automated sampling, eliminate personal safety risks, and reduce operational workload. Utility Model Content

[0005] This application provides an automatic coal sampling device for chutes to solve the problem that coal sampling operations for chutes cannot be automated.

[0006] This application provides an automatic coal sampling device for a chute, comprising: a sampling chute, a sampling flap, a sampling flap shaft, a fork, a sample receiving bucket, an electro-hydraulic actuator, a limit switch, and an electrical control box; the sampling chute is located outside the non-coal receiving face opening on the chute; the sampling flap shaft is sleeved with bushings on both sides of the chute; the sample receiving bucket is located directly below the material discharge pipe of the sampling chute; the sampling flap is fixedly connected to the sampling flap shaft, and the fork is fixedly connected to one end of the sampling flap shaft to form a sampling flap assembly; the electro-hydraulic actuator is mounted on a base connected to the chute, and the piston rod U-shaped opening of the electro-hydraulic actuator is hinged to the fork for rotating the sampling flap assembly; the limit switch is located at the end of the stroke of the electro-hydraulic actuator, and the electrical control box is communicatively connected to the electro-hydraulic actuator.

[0007] The automatic coal sampling device for chutes provided in this application drives the sampling flap assembly to rotate via an electro-hydraulic actuator, thereby automating the sampling operation, reducing the need for manual intervention, improving sampling efficiency, and enhancing the consistency and reliability of the sampling process.

[0008] Optionally, the automatic coal sampling device for the chute further includes an observation door; the sampling chute is a cavity composed of seven iron plates, and a downward-extending material drop pipe is connected to the center of the bottom of the cavity; the observation door is located on the side wall of the cavity, the door frame of the observation door is hinged to the side plate of the cavity via hinges, and the door body of the observation door is equipped with a locking mechanism.

[0009] By installing an observation door with a hinge and locking mechanism on the side wall of the sampling chute cavity, it is convenient to observe and maintain the inside of the cavity, which helps to maintain the airtightness of the sampling environment and improves the convenience of equipment maintenance operations.

[0010] Optionally, the sampling flap is a rectangular plate structure, with one side of the sampling flap fixedly connected to the shaft surface of the sampling flap shaft; both ends of the sampling flap shaft are rotatably connected to the bushings on both sides of the chute; when the sampling flap is rotated to the closed state, the plate surface completely covers the non-coal receiving face opening, and the edge of the plate surface extends beyond the opening boundary.

[0011] By designing the sampling flap as a rectangular plate structure fixedly connected to the sampling flap shaft, and ensuring that its surface completely covers and extends beyond the opening boundary when closed, the sealing performance of the sampling port is improved, material leakage is reduced, and the stability of the structure's operation is enhanced.

[0012] Optionally, the automatic coal sampling device for the chute further includes a rotary anti-clogging switch; the rotary anti-clogging switch includes a horizontally arranged cross-shaped detection blade, which is mounted inside a waterproof housing via a rotating shaft; the waterproof housing penetrates the side wall of the sampling chute and is fixedly connected via a flange; the rotating shaft passes through the inner cavity of the waterproof housing, and its extended end is connected to a drive motor via a coupling; a multi-core cable interface is provided on the outer wall of the waterproof housing, and the wires inside the multi-core cable interface are connected to the wiring terminals of the drive motor and the electrical control box.

[0013] By installing a rotary anti-clogging switch with a horizontal cross-shaped detection blade, which is fixed to the side wall of the sampling chute and connected to the electrical control box via a flange, the switch can monitor the material blockage status and send a signal when blockage occurs. This helps to reduce the risk of chute blockage, improve the continuity of system operation, and reduce maintenance needs caused by blockage.

[0014] Optionally, the limit switch is two mechanical limit switches, which are respectively fixed to the two ends of the electro-hydraulic actuator cylinder by rigid brackets; the triggering component of each limit switch faces the direction of piston rod movement.

[0015] By fixing two mechanical limit switches to the axial ends of the electro-hydraulic actuator cylinder via rigid brackets and aligning the triggering components with the direction of piston rod movement, it is helpful to accurately detect the end position of the piston rod's stroke, thereby improving the accuracy of the sampling flap positioning, reducing the possibility of equipment over-positioning, and enhancing the reliability of the control system.

[0016] Optionally, the automatic coal sampling device for the chute further includes a sample receiving bucket limiting device; the sample receiving bucket limiting device includes a circular groove fixed to the ground, and the sample receiving bucket is disposed in the circular groove.

[0017] By setting a circular groove fixed to the ground as a limiting device for the sample receiving bucket, placing the sample receiving bucket in the groove helps to limit the horizontal movement of the sample receiving bucket, improve its positional stability during the sampling process, reduce the risk of sampling failure due to bucket displacement, and improve the standardization of sampling operations.

[0018] Optionally, the electrical control box has a sealed enclosure structure. The front panel of the electrical control box is equipped with a rotary power switch, a self-reset button, and a parameter setting unit. The back of the electrical control box is equipped with a multi-channel signal interface, which is respectively connected to the electro-hydraulic actuator power cable, the limit switch signal line, and the rotary anti-blocking switch cable.

[0019] By adopting a sealed enclosure structure for the electrical control box, and setting a rotary power switch, self-reset button, and parameter setting unit on its panel, and a multi-channel signal interface on the back for centralized connection of cables for various components, the integration and sealing protection of the electrical control system are improved, the influence of the external environment on electrical components is reduced, and it is also convenient for operators to centrally control the equipment and adjust parameters, thereby enhancing the convenience of system operation and the overall coordination of operation.

[0020] Optionally, the bottom of the electro-hydraulic actuator cylinder is fixed to the base by flange bolts; the piston rod end of the electro-hydraulic actuator is provided with a U-shaped hinge joint, and coaxial through holes are opened on both sides of the U-shaped hinge joint, which is hinged to the through hole of the fork end of the shift fork by a cylindrical pin.

[0021] The electro-hydraulic actuator cylinder is fixed to the base by flange bolts, and a U-shaped hinge joint with a coaxial through hole is set at the end of the piston rod. The hinge is achieved by a cylindrical pin and a shift fork, which helps to enhance the structural stability of the actuator installation, reduce vibration and offset during operation, facilitate maintenance and disassembly, and improve the reliability of power transmission.

[0022] Optionally, the shift fork is made of a Y-shaped component cast in one piece, and the central hole of the shift fork is connected to and fixed to the sampling flap shaft by a key; the forked end of the shift fork is two parallel ear plates, and the through hole is opened on each parallel ear plate.

[0023] By adopting a Y-shaped shift fork component that is integrally cast, the central hole is connected to and fixed to the sampling flap shaft via a key. The fork end is equipped with a parallel ear plate with through holes, which helps to improve the structural strength and force transmission stability of the shift fork, reduce the risk of loose connection, facilitate hinged installation with the actuating parts, and improve the synchronization of power transmission.

[0024] Optionally, the axis of the discharge pipe of the sampling chute coincides with the central axis of the sample receiving barrel; the sample receiving barrel is a cylindrical container with an open top, and the bottom diameter of the sample receiving barrel is larger than the outlet diameter of the discharge pipe.

[0025] By aligning the axis of the discharge pipe of the sampling chute with the central axis of the sample receiving bucket, and using an open-top cylindrical container as the sample receiving bucket with a bottom diameter larger than the outlet diameter of the discharge pipe, it helps to guide the material to fall into the bucket in a concentrated manner, reducing material splashing during the sampling process, improving the integrity of sample collection, and reducing sampling errors caused by alignment deviations.

[0026] As can be seen from the above technical solutions, this application provides an automatic coal sampling device for a chute, comprising: a sampling chute, a sampling flap, a sampling flap shaft, a fork, a sample receiving bucket, an electro-hydraulic actuator, a limit switch, and an electrical control box; the sampling chute is located outside the non-coal receiving face opening on the chute; the sampling flap shaft is sleeved with bushings on both sides of the chute; the sample receiving bucket is located directly below the material discharge pipe of the sampling chute; the sampling flap is fixedly connected to the sampling flap shaft, and the fork is fixedly connected to one end of the sampling flap shaft to form a sampling flap assembly; the electro-hydraulic actuator is mounted on a base connected to the chute, and the piston rod U-shaped opening of the electro-hydraulic actuator is hinged to the fork for rotating the sampling flap assembly; the limit switch is located at the end of the stroke of the electro-hydraulic actuator, and the electrical control box is communicatively connected to the electro-hydraulic actuator to solve the problem that coal sampling operations for chutes cannot be automated. Attached Figure Description

[0027] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of an automatic coal sampling device for a chute provided in an embodiment of this application.

[0029] Illustration:

[0030] Among them, 1-sampling chute; 2-sampling flap; 3-sampling flap shaft; 4-shift fork; 5-observation door; 6-rotor anti-blocking switch; 7-sampling bucket; 8-sampling bucket limit device; 9-electro-hydraulic actuator; 10-limit switch; 11-electric control box; 12-non-coal receiving face. Detailed Implementation

[0031] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application.

[0032] To address the issue of the lack of automation in coal sampling operations used in chutes, see [link to relevant documentation]. Figure 1 This application provides an automatic coal sampling device for a chute, comprising: a sampling chute 1, a sampling flap 2, a sampling flap shaft 3, a fork 4, a sample receiving bucket 7, an electro-hydraulic actuator 9, a limit switch 10, and an electrical control box 11; the sampling chute 1 is located outside the opening of the non-coal receiving surface 12 on the chute; the sampling flap shaft 3 is sleeved with the bushings on both sides of the chute; the sample receiving bucket 7 is located directly below the discharge pipe of the sampling chute 1; the sampling flap 2 is fixedly connected to the sampling flap shaft 3, and the fork 4 is fixedly connected to one end of the sampling flap shaft 3 to form a sampling flap assembly; the electro-hydraulic actuator 9 is set on a base connected to the chute, and the piston rod U-shaped opening of the electro-hydraulic actuator 9 is hinged to the fork 4 for rotating the sampling flap assembly; the limit switch 10 is set at the end of the stroke of the electro-hydraulic actuator 9, and the electrical control box 11 is communicatively connected to the electro-hydraulic actuator 9.

[0033] It should be understood that during use, the piston rod of the electro-hydraulic actuator 9 retracts, causing the flap assembly to rotate a certain angle to the sampling position. During sampling, the sampling flap 2 collects a small portion of coal from the chute, after which the coal slides down into the sampling bucket 7. After sampling, the piston rod of the electro-hydraulic actuator 9 extends, and the sampling flap assembly rotates a certain angle to press against the non-coal-receiving surface 12 of the chute, thereby blocking the holes and preventing coal spillage. The extension and retraction time of the piston rod of the electro-hydraulic actuator 9 can also be set according to actual conditions. The limit switch 10 ensures the accurate movement stroke of the electro-hydraulic actuator 9, avoiding damage or inaccurate sampling caused by excessive movement.

[0034] Specifically, the sampling flap 2 is wider and longer than the opening width and length of the non-coal receiving face 12 on the chute. When no material is being collected, the sampling flap 2 is used to block the opening of the non-coal receiving face 12. The outer side of the opening of the non-coal receiving face 12 is welded to the sampling chute 1. The sampling flap 2 is welded and fixed to the sampling flap shaft 3. The fork 4 is welded to one end of the sampling flap shaft 3.

[0035] The automatic coal sampling device for chutes provided in this application drives the sampling flap assembly to rotate via an electro-hydraulic actuator 9, thereby automating the sampling operation, reducing the need for manual intervention, improving sampling efficiency, and enhancing the consistency and reliability of the sampling process.

[0036] In some embodiments, the automatic coal sampling device for the chute further includes an observation door 5; the sampling chute 1 is a cavity made of seven iron plates, and a downward-extending discharge pipe is connected to the center of the bottom of the cavity; the observation door 5 is located on the side wall of the cavity, the door frame of the observation door 5 is hinged to the side plate of the cavity by a hinge, and the door body of the observation door 5 is provided with a locking mechanism.

[0037] It should be understood that the sampling chute 1 is specifically constructed from seven welded iron plates. The design of the observation door 5 allows operators to observe and maintain the interior of the sampling chute 1 without interrupting the sampling process. When it is necessary to check the condition of the coal inside the sampling chute 1 or to perform cleaning work, the operator can open the locking mechanism and easily rotate the observation door 5 to directly observe the interior of the chute. The hinged design of the observation door 5 frame and the cavity side plate ensures the stability and ease of operation of the door. At the same time, the use of hinges ensures the durability and long-term reliability of the door. The design of the discharge pipe ensures that the sampled coal can flow out smoothly and stably, avoiding blockages or spillage, further improving sampling efficiency and accuracy.

[0038] By setting an observation door 5 with a hinge and locking mechanism on the side wall of the sampling chute 1, it is convenient to observe and maintain the inside of the cavity, which helps to maintain the airtightness of the sampling environment and improves the convenience of equipment maintenance operations.

[0039] In some embodiments, the sampling flap 2 is a rectangular plate structure, and one side of the sampling flap 2 is fixedly connected to the axial surface of the sampling flap shaft 3; both ends of the sampling flap shaft 3 are rotatably connected to the bushings on both sides of the chute; when the sampling flap 2 is rotated to the closed state, the plate surface completely covers the opening of the non-coal receiving face 12, and the edge of the plate surface extends beyond the opening boundary.

[0040] It should be understood that the sampling flap 2 is designed to precisely control the coal sampling process. When the sampling flap 2 is in the open state, coal can freely enter the sampling device through the non-coal receiving face 12 opening for subsequent sampling and analysis. After sampling is completed, the sampling flap 2 can be rotated to the closed state to effectively seal the opening, preventing further coal inflow and avoiding coal leakage during sampling, thus maintaining a clean and accurate sampling environment. Furthermore, the design of the sampling flap 2's edge extending beyond the opening boundary further enhances the sealing performance, ensuring no coal spillage during sampling, thereby improving sampling accuracy and reliability. This design not only simplifies the sampling operation but also improves sampling efficiency, making the entire sampling process smoother and more efficient.

[0041] In some embodiments, the automatic coal sampling device for the chute further includes a rotary anti-clogging switch 6; the rotary anti-clogging switch 6 includes a horizontally arranged cross-shaped probe blade, which is mounted inside a waterproof housing via a rotating shaft; the waterproof housing penetrates the side wall of the sampling chute 1 and is fixedly connected by a flange; the rotating shaft passes through the inner cavity of the waterproof housing, and its extended end is connected to a drive motor via a coupling; a multi-core cable interface is provided on the outer wall of the waterproof housing, and the wires inside the multi-core cable interface are connected to the wiring terminals of the drive motor and the electrical control box 11.

[0042] It should be understood that during coal sampling, blockages may occur in the sampling chute 1 due to factors such as coal moisture and particle size, thus affecting the smooth progress of sampling. The rotary paddle anti-blocking switch 6, through its horizontally arranged cross-shaped detection paddle, can monitor the coal flow in the chute in real time. Once a blockage is detected, the detection paddle will rotate due to resistance, and then transmit a signal to the drive motor through the shaft. After receiving the signal, the drive motor sends it to the electrical control box 11, which in turn sends a locking command to the limit switch 10 to lock the electro-hydraulic push rod 9 in a timely manner. At the same time, the waterproof housing design ensures the stable operation of the rotary paddle anti-blocking switch 6 in humid environments, avoiding malfunctions caused by moisture intrusion. The multi-core cable interface facilitates the electrical connection between the drive motor and the electrical control box 11, making the control of the entire sampling device more flexible and reliable.

[0043] By setting up a rotary anti-clogging switch 6 with a horizontal cross-shaped detection blade, which is fixed to the side wall of the sampling chute 1 and connected to the electrical control box 11 via a flange, the switch can monitor the material blockage status and send a signal when blockage occurs, which helps to reduce the risk of chute blockage, improve the continuity of system operation, and reduce maintenance needs caused by blockage.

[0044] In some embodiments, the limit switch 10 consists of two mechanical limit switches, which are respectively fixed to the axial ends of the cylinder of the electro-hydraulic actuator 9 by rigid brackets; the triggering component of each limit switch faces the direction of piston rod movement.

[0045] It should be understood that the two limit switches are used to lock the electro-hydraulic actuator 9 at the sampling position and the stop position, respectively. When the piston rod of the electro-hydraulic actuator 9 moves to the sampling position or the stop position, it will trigger the corresponding limit switch. The limit switch then sends a signal to the electrical control box 11. After receiving the signal, the electrical control box 11 controls the electro-hydraulic actuator 9 to stop moving, thereby achieving precise positioning and stable locking.

[0046] By fixing two mechanical limit switches to the axial ends of the electro-hydraulic actuator cylinder 9 via rigid brackets and aligning the triggering components with the piston rod movement direction, it is helpful to accurately detect the end position of the piston rod stroke, thereby improving the accuracy of the sampling flap positioning, reducing the possibility of equipment over-positioning, and enhancing the reliability of the control system.

[0047] In some embodiments, the automatic coal sampling device for the chute further includes a sample receiving bucket limiting device 8; the sample receiving bucket limiting device 8 includes a circular groove fixed to the ground, and the sample receiving bucket 7 is disposed in the circular groove.

[0048] It should be understood that the sample receiving container limiting device 8 is used to limit the displacement of the sample receiving container 7 after it is impacted by the coal sample. The inner wall of the circular groove is provided with anti-slip texture to increase the friction between the sample receiving container 7 and the circular groove, further preventing the sample receiving container 7 from shifting when impacted by the coal sample. In addition, a drainage hole is provided at the bottom of the circular groove to prevent water accumulation from affecting the stability of the sample receiving container 7 and the quality of the coal sample.

[0049] By setting a circular groove fixed to the ground as a sample receiving bucket limiting device 8, the sample receiving bucket 7 is placed in the groove, which helps to limit the horizontal movement of the sample receiving bucket 7, improve its positional stability during the sampling process, reduce the risk of sampling failure due to bucket displacement, and improve the standardization of sampling operations.

[0050] In some embodiments, the control box 11 is a sealed box structure. The control box 11 has a rotary power switch, a self-reset button and a parameter setting unit on its panel. The control box 11 has a multi-channel signal interface on its back, which is connected to the power cable of the electro-hydraulic actuator 9, the signal line of the limit switch 10 and the cable of the rotary anti-blocking switch 6.

[0051] It should be understood that the electrical control box 11 can realize remote, local, and timed cyclic operation.

[0052] By adopting a sealed enclosure structure for the electrical control box 11, and setting a rotary power switch, self-reset button and parameter setting unit on its panel, and setting a multi-channel signal interface on the back for centralized connection of cables of various components, it helps to improve the integration and sealing protection of the electrical control system, reduce the impact of the external environment on electrical components, and facilitate operators to centrally control the equipment and adjust parameters, thereby enhancing the convenience of system operation and the overall coordination of operation.

[0053] In some embodiments, the bottom of the cylinder of the electro-hydraulic actuator 9 is fixed to the base by flange bolts; the piston rod end of the electro-hydraulic actuator 9 is provided with a U-shaped hinge joint, and coaxial through holes are opened on both sides of the U-shaped hinge joint, which is hinged to the through hole of the fork end of the shift fork 4 by a cylindrical pin.

[0054] The electro-hydraulic actuator 9 cylinder is fixed to the base by flange bolts, and a U-shaped hinge joint with a coaxial through hole is provided at the end of the piston rod. The hinge is achieved by a cylindrical pin and a shift fork 4, which helps to enhance the structural stability of the actuator installation, reduce vibration and offset during operation, facilitate maintenance and disassembly, and improve the reliability of power transmission.

[0055] In some embodiments, the shift fork 4 is composed of a Y-shaped component integrally cast, and the central hole of the shift fork 4 is connected to and fixed to the sampling flap shaft 3 by a key; the forked end of the shift fork 4 is two parallel ear plates, and through holes are opened on each parallel ear plate.

[0056] By adopting a Y-shaped shift fork 4 component that is integrally cast, the central hole is connected to and fixed to the sampling flap shaft 3 via a key. The fork end is provided with a parallel ear plate with a through hole, which helps to improve the structural strength and force transmission stability of the shift fork 4, reduce the risk of loose connection, facilitate hinged installation with the actuating parts, and improve the synchronization of power transmission.

[0057] In some embodiments, the axis of the discharge pipe of the sampling chute 1 coincides with the central axis of the sample receiving barrel 7; the sample receiving barrel 7 is a cylindrical container with an open top, and the bottom diameter of the sample receiving barrel 7 is larger than the outlet diameter of the discharge pipe.

[0058] By aligning the axis of the discharge pipe of the sampling chute 1 with the central axis of the sample receiving bucket 7, and using an open cylindrical container as the sample receiving bucket 7 with a bottom diameter larger than the discharge pipe outlet diameter, it helps to guide the material to fall into the bucket in a concentrated manner, reducing material splashing during the sampling process, improving the integrity of sample collection, and reducing sampling errors caused by alignment deviations.

[0059] As can be seen from the above technical solutions, this application provides an automatic coal sampling device for a chute, including: a sampling chute 1, a sampling flap 2, a sampling flap shaft 3, a fork 4, a sample receiving bucket 7, an electro-hydraulic actuator 9, a limit switch 10, and an electrical control box 11; the sampling chute 1 is located outside the opening of the non-coal receiving surface 12 on the chute; the sampling flap shaft 3 is sleeved with the bushings on both sides of the chute; the sample receiving bucket 7 is located directly below the discharge pipe of the sampling chute 1; the sampling flap 2 is fixedly connected to the sampling flap shaft 3, and the fork 4 is fixedly connected to one end of the sampling flap shaft 3 to form a sampling flap assembly; the electro-hydraulic actuator 9 is set on a base connected to the chute, and the piston rod U-shaped opening of the electro-hydraulic actuator 9 is hinged to the fork 4 for rotating the sampling flap assembly; the limit switch 10 is set at the end of the stroke of the electro-hydraulic actuator 9, and the electrical control box 11 is communicatively connected to the electro-hydraulic actuator 9 to solve the problem that the coal sampling operation for the chute cannot be automated.

[0060] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. An automatic coal sampling device for a chute, characterized in that, include: Sampling chute (1), sampling flap (2), sampling flap shaft (3), shift fork (4), sample receiving bucket (7), electro-hydraulic actuator (9), limit switch (10) and electrical control box (11); The sampling chute (1) is set outside the opening of the non-coal receiving face (12) on the chute; the sampling flap shaft (3) is sleeved with the bushings on both sides of the chute; the sample receiving bucket (7) is located directly below the material drop pipe of the sampling chute (1); The sampling flap (2) is fixedly connected to the sampling flap shaft (3), and the fork (4) is fixedly connected to one end of the sampling flap shaft (3) to form a sampling flap assembly; The electro-hydraulic actuator (9) is mounted on a base connected to the chute. The piston rod U-shaped opening of the electro-hydraulic actuator (9) is hinged to the fork (4) for rotating the sampling flap assembly. The limit switch (10) is located at the end of the stroke of the electro-hydraulic actuator (9), and the electrical control box (11) is communicatively connected to the electro-hydraulic actuator (9).

2. The automatic coal sampling device for a chute according to claim 1, characterized in that, It also includes the observation gate (5); The sampling chute (1) is a cavity made of seven iron plates, and a downward-extending drop pipe is connected to the center of the bottom of the cavity; the observation door (5) is set on the side wall of the cavity, and the door frame of the observation door (5) is hinged to the side plate of the cavity by a hinge, and the door body of the observation door (5) is equipped with a locking mechanism.

3. The automatic coal sampling device for a chute according to claim 1, characterized in that, The sampling flap (2) is a rectangular plate structure. One side of the sampling flap (2) is fixedly connected to the axial surface of the sampling flap shaft (3). The two ends of the sampling flap shaft (3) are rotatably connected to the bushings on both sides of the chute. When the sampling flap (2) is rotated to the closed state, the plate surface completely covers the opening of the non-coal receiving face (12), and the edge of the plate surface extends beyond the boundary of the opening.

4. The automatic coal sampling device for a chute according to claim 1, characterized in that, It also includes a rotary anti-blocking switch (6); The rotary anti-blocking switch (6) includes a horizontally arranged cross-shaped detection blade, which is installed inside a waterproof housing via a rotating shaft; the waterproof housing penetrates the side wall of the sampling chute (1) and is fixedly connected by a flange; the rotating shaft passes through the inner cavity of the waterproof housing, and its extended end is connected to a drive motor via a coupling; a multi-core cable interface is provided on the outer wall of the waterproof housing, and the wires inside the multi-core cable interface are connected to the wiring terminals of the drive motor and the electrical control box (11).

5. The automatic coal sampling device for a chute according to claim 1, characterized in that, The limit switch (10) consists of two mechanical travel switches, which are respectively fixed to the two ends of the axial direction of the cylinder of the electro-hydraulic push rod (9) by rigid brackets; the triggering component of each travel switch is oriented towards the direction of piston rod movement.

6. The automatic coal sampling device for a chute according to claim 1, characterized in that, It also includes a sample receiving bucket limiting device (8); The sample receiving bucket limiting device (8) includes a circular groove fixed to the ground, and the sample receiving bucket (7) is set in the circular groove.

7. The automatic coal sampling device for a chute according to claim 4, characterized in that, The electrical control box (11) is a sealed box structure. The panel of the electrical control box (11) is equipped with a rotary power switch, a self-reset button and a parameter setting unit. The back of the electrical control box (11) is equipped with a multi-channel signal interface, which is connected to the power cable of the electro-hydraulic actuator (9), the signal line of the limit switch (10) and the cable of the rotary anti-blocking switch (6).

8. The automatic coal sampling device for a chute according to claim 1, characterized in that, The bottom of the cylinder of the electro-hydraulic actuator (9) is fixed to the base by flange bolts; a U-shaped hinge joint is provided at the end of the piston rod of the electro-hydraulic actuator (9), and coaxial through holes are opened on both sides of the U-shaped hinge joint, which is hinged to the through hole at the fork end of the shift fork (4) by a cylindrical pin.

9. The automatic coal sampling device for a chute according to claim 8, characterized in that, The shift fork (4) is made of a Y-shaped component cast in one piece. The central hole of the shift fork (4) is connected to the sampling flip shaft (3) by a key. The forked end of the shift fork (4) is two parallel ear plates, and the through hole is opened on each parallel ear plate.

10. The automatic coal sampling device for a chute according to claim 1, characterized in that, The axis of the discharge pipe of the sampling chute (1) coincides with the central axis of the sample receiving bucket (7); the sample receiving bucket (7) is a cylindrical container with an open top, and the bottom diameter of the sample receiving bucket (7) is larger than the outlet diameter of the discharge pipe.

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