Coal picker

Abstract

The utility model relates to the technical field of coal screening equipment, in particular to a coal picker which comprises a mounting frame, a first screening net plate, a feeding hopper, a feeding impeller and a driving device. The first screening net plate is connected to the mounting frame and is obliquely arranged up and down; the feeding hopper is connected to the mounting frame and provided with a discharging port, and the discharging port is located above the higher end of the screening net plate. The feeding impeller is rotationally connected to the mounting frame or the feeding hopper and located above the higher end of the first screening net plate, and at least part of the feeding impeller is located in the discharging opening. The driving device is connected to the mounting frame or the feeding hopper and is in transmission connection with the feeding impeller, the driving device drives the feeding impeller to rotate, the coal discharging speed can be controlled by adjusting the rotating speed of the feeding impeller, the feeding impeller can further play a role in pushing coal falling on the first screening net plate, and the coal is prevented from blocking the first screening net plate.

Description

Technical Field

[0001] This utility model relates to the technical field of coal screening equipment, and in particular to a coal preparation machine. Background Technology

[0002] To meet market demand, coal plants need to use coal preparation machines to screen coal of different particle sizes, such as lump coal and pulverized coal, to satisfy the diverse raw material requirements of industries such as metallurgy, power, and chemicals. Coal preparation machines typically consist of a feeding hopper and a screening device. The feeding hopper is located above the screening device. Coal is poured into the feeding hopper, and the coal falls into the screening device under its own gravity. A valve plate is installed at the discharge port at the lower end of the feeding hopper to regulate the size of the discharge port. However, controlling the discharge port size to adjust the feeding speed is difficult to precisely control. Furthermore, a small discharge port can easily cause coal blockage within the feeding hopper, while a large discharge port results in excessively fast coal descent, hindering thorough screening. Utility Model Content

[0003] The technical problem to be solved by this utility model is that the existing coal preparation machine adjusts the coal feeding speed by adjusting the size of the discharge port of the feeding hopper, which easily leads to coal clogging in the feeding hopper, or the coal falling too fast, making it impossible to fully screen the coal.

[0004] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a coal preparation machine, including: a mounting frame, a first screening screen plate, a feeding hopper, a feeding impeller and a driving device;

[0005] The first screening screen is connected to the mounting frame and the first screening screen is arranged at an angle from top to bottom;

[0006] The feeding hopper is connected to the mounting frame, and the feeding hopper has a discharge port located above the higher end of the first screening screen plate;

[0007] The feeding impeller is rotatably connected to the mounting frame or the feeding hopper, the feeding impeller is located above the higher end of the first screening screen plate, and at least a portion of the feeding impeller is located in the discharge port;

[0008] The drive device is connected to the mounting frame or the feeding hopper and is driven by the feeding impeller.

[0009] As a preferred embodiment, the coal preparation machine further includes a second screening screen and a discharge impeller; the second screening screen is disposed on the mounting frame and located below the first screening screen; the discharge impeller is rotatably connected to the mounting frame and located between the second screening screen and the first screening screen.

[0010] As a preferred embodiment, the driving device includes a first motor, a first pulley, and a second pulley. The first motor is connected to the mounting frame, and the output end of the first motor is connected to the discharge impeller and the first pulley. The second pulley is connected to the feeding impeller, and the second pulley and the first pulley are driven by a belt.

[0011] As a preferred embodiment, a spray head is connected to the upper end of the feeding hopper, and the spray head has a spray nozzle arranged towards the feed inlet of the feeding hopper.

[0012] As a preferred embodiment, the coal preparation machine further includes a reciprocating lifting device, and the mounting frame is mounted on the reciprocating lifting device.

[0013] As a preferred embodiment, the reciprocating lifting device includes a base, a first lifting mechanism, and a second lifting mechanism;

[0014] The mounting frame has a first direction and a second direction arranged vertically. The lower ends of the first lifting mechanism and the second lifting mechanism are connected to the upper ends of the base on both sides in the first direction. The upper ends of the first lifting mechanism and the second lifting mechanism are connected to the lower ends of the mounting frame on both sides in the first direction. The first lifting mechanism has a first opening that extends through the first direction, and the second lifting mechanism has a second opening that extends through the first direction.

[0015] The coal preparation machine also includes a receiving tray, which is disposed on the base and located below the mounting frame, and the receiving tray passes through the first opening and the second opening.

[0016] As a preferred embodiment, the reciprocating lifting device further includes a first sliding member, a second sliding member, and a driving mechanism; the first sliding member and the second sliding member are slidably connected to the base along the first direction, and the driving mechanism is configured to drive the first sliding member and the second sliding member to move closer to or further away from each other;

[0017] The first lifting mechanism includes a first support member, and the second lifting mechanism includes a second support member. The lower ends of the first support member and the second support member are respectively hinged to the first sliding member and the second sliding member. The hinge axes of the first support member and the second support member are both parallel to the second direction. The upper ends of the first support member and the upper ends of the second support member are respectively hinged to the lower ends of the mounting bracket on both sides in the first direction.

[0018] The first opening and the second opening are respectively provided on the first support member and the second support member.

[0019] As a preferred embodiment, the drive mechanism includes a tension spring, a second motor, and a cam component;

[0020] The cam is rotatably connected to the base and is located between the first slider and the second slider. In the first direction, one end of the tension spring is connected to the first slider and the other end is connected to the second slider. The first slider and the second slider abut against the two sides of the cam in the first direction.

[0021] The second motor is connected to the base and is driven by the cam component.

[0022] As a preferred embodiment, the reciprocating lifting device further includes a guide column, which is connected to the base, and the first sliding member and the second sliding member are slidably sleeved on the outside of the guide column.

[0023] As a preferred embodiment, the first support member includes a first link and a second link arranged parallel to each other along the second direction, the interval between the first link and the second link forming the first opening; the second support member includes a third link and a fourth link arranged parallel to each other along the second direction, the interval between the third link and the fourth link forming the second opening;

[0024] The upper ends of the first connecting rod and the upper ends of the second connecting rod are hinged to the lower end of the mounting bracket on one side in the first direction; the lower ends of the first connecting rod and the lower ends of the second connecting rod are hinged to the upper end of the first sliding member.

[0025] The upper ends of the third link and the fourth link are hinged to the lower end of the mounting bracket on the other side in the first direction; the lower ends of the third link and the fourth link are hinged to the upper end of the second sliding member.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] The coal preparation machine of this utility model includes a mounting frame, a first screening screen, a feeding hopper, a feeding impeller, and a driving device. The first screening screen is connected to the mounting frame and is arranged at an angle. The feeding hopper is connected to the mounting frame and has a discharge port located above the higher end of the screening screen. The feeding impeller is rotatably connected to the mounting frame or the feeding hopper and is located above the higher end of the first screening screen, with at least a portion of the feeding impeller located in the discharge port. The driving device is connected to the mounting frame or the feeding hopper and is driven by the feeding impeller. The driving device drives the feeding impeller to rotate, which can deliver coal from the discharge port to the higher end of the first screening screen. The coal feeding speed can be controlled by adjusting the rotation speed of the feeding impeller. In addition, the feeding impeller can also push the coal falling on the first screening screen to prevent coal from clogging the first screening screen. Attached Figure Description

[0028] Figure 1 This is the first isometric view of the coal preparation machine of this utility model;

[0029] Figure 2 This is a second isometric view of the coal preparation machine of this utility model;

[0030] Figure 3 This is a cross-sectional view of the coal preparation machine of this utility model;

[0031] Figure 4 This is a schematic diagram of the assembly structure of the base, cam, tension spring, first sliding member, and second sliding member;

[0032] In the diagram, X represents the first direction, Y represents the second direction, 1 is the mounting frame, 21 is the first screening screen, 22 is the second screening screen, 31 is the feeding impeller, 32 is the discharge impeller, 4 is the feeding hopper, 41 is the discharge port, 5 is the drive device, 51 is the first motor, 52 is the second pulley, 6 is the spray head, 7 is the reciprocating lifting device, 71 is the first support member, 711 is the first opening, 712 is the first connecting rod, 713 is the second connecting rod, 72 is the second support member, 721 is the second opening, 722 is the third connecting rod, 723 is the fourth connecting rod, 73 is the base, 74 is the first sliding member, 75 is the second sliding member, 76 is the drive mechanism, 761 is the tension spring, 762 is the second motor, 763 is the cam member, 77 is the guide column, and 8 is the receiving tray. Detailed Implementation

[0033] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0034] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms; these terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be called "second" information, and similarly, "second" information can also be called "first" information.

[0035] like Figures 1 to 4As shown, a preferred embodiment of the coal preparation machine of this utility model includes: a mounting frame 1, a first screening screen plate 21, a feeding hopper 4, a feeding impeller 31, and a driving device 5; the first screening screen plate 21 is connected to the mounting frame 1 and is arranged vertically at an inclination; the feeding hopper 4 is connected to the mounting frame 1 and has a discharge port 41, which is located above the higher end of the first screening screen plate 21; the feeding impeller 31 is rotatably connected to the mounting frame 1 or the feeding hopper 4, and is located above the higher end of the first screening screen plate 21, with at least a portion of the feeding impeller 31 located in the discharge port 41; the driving device 5 is connected to the mounting frame 1 or the feeding hopper 4 and is drively connected to the feeding impeller 31. The drive device 5 drives the feeding impeller 31 to rotate, which can send the coal at the discharge port 41 to the higher end of the first screening screen plate 21. The coal feeding speed can be controlled by adjusting the rotation speed of the feeding impeller 31. In addition, the feeding impeller 31 can also push the coal falling on the first screening screen plate 21 to prevent the coal from clogging on the first screening screen plate 21. The mounting frame 1 is a cuboid frame, and the first screening screen plate 21 is a rectangular screen plate. The length direction of the first screening screen plate 21 is inclined upwards and downwards. The feeding impeller 31 includes a first rotating shaft and multiple first blades fixed to the outside of the first rotating shaft. The axis of the first rotating shaft is arranged along the width direction of the first screening screen plate 21. The multiple first blades are all rectangular. In this embodiment, there are four first blades. The four first blades are evenly spaced around the axis of the first rotating shaft. The included angle between two adjacent first blades is 90°. The length direction of the first blades is arranged along the length direction of the first rotating shaft. One side of the width direction of the first blade is fixed to the first rotating shaft. The distance between the first rotating shaft and the first screening screen plate 21 is greater than the width of the first blade. The difference between the distance between the first rotating shaft and the first screening screen plate 21 and the width of the first blade is greater than or equal to 5 mm and less than or equal to 20 mm, so that the first screening screen plate 21 will not interfere with the rotation of the first blades, and the first blades can push the coal on the first screening screen plate 21 downwards. The rotation of the first shaft causes each first blade to rotate around the axis of the first shaft, and each first blade pushes the coal on the first screening screen plate 21 downwards.

[0036] In this embodiment, the coal preparation machine further includes a second screening screen 22 and a discharge impeller 32. The second screening screen 22 is mounted on the mounting frame 1 and located below the first screening screen 21. The discharge impeller 32 is rotatably connected to the mounting frame 1 and located between the second screening screen 22 and the first screening screen 21. Specifically, the aperture of the screening holes in the second screening screen 22 is smaller than that in the first screening screen 21. During operation, larger coal particles are blocked at the upper end of the first screening screen 21, and the discharge impeller 31 can push the larger coal particles on the first screening screen 21 to slide downwards. To facilitate the collection of larger coal particles, in this embodiment, a first receiving hopper is connected to the mounting frame 1. The first receiving hopper is arranged at an angle, with its upper end connected to one side of the mounting frame 1 along its length and located below the lower end of the first screening screen 21. Larger coal particles flowing from the first screening screen 21 fall into the first receiving hopper. Medium-sized coal particles pass through the screening holes of the first screening screen 21 and fall onto the second screening screen 22. Smaller coal particles pass through the screening holes of the second screening screen 22 and fall below it. Medium-sized coal particles with a diameter larger than the mesh size of the second screening screen 22 are blocked on the second screening screen 22 and slide down along its upper surface. The structure of the discharge impeller 32 is the same as that of the feeding impeller 31. When the discharge impeller 32 rotates, it can discharge medium-sized coal particles from the second screening screen 22 onto the second screening screen 22. To facilitate the collection of medium-sized coal particles, in this embodiment of the invention, a second receiving hopper can be connected to the mounting frame 1. The second receiving hopper is connected to the other side of the mounting frame 1 along its length. The second receiving hopper is arranged at an angle, with its upper end connected to the mounting frame 1. The second receiving hopper is located below the lower end of the second screening screen 22. Medium-sized coal particles falling from the upper surface of the second screening screen 22 fall into the second receiving hopper.

[0037] In this embodiment, the driving device 5 includes a first motor 51, a first pulley, and a second pulley 52. ​​The motor is connected to the mounting bracket 1. The output end of the first motor 51 is connected to the discharge impeller 32 and the first pulley. The second pulley 52 is connected to the feeding impeller 31, and the second pulley 52 and the first pulley are driven by a belt. Specifically, the rotation of the first motor 51 drives the discharge impeller 32 to rotate, and through the first pulley drives the second pulley 52 to rotate, thereby driving the feeding impeller 31 and the discharge impeller 32 to rotate in the same direction. By adjusting the speed of the first motor 51, the feeding speed of the feeding impeller 31 and the discharge speed of the discharge impeller 32 can be adjusted. In this embodiment, as shown... Figure 3As shown, the discharge impeller 32 is located above the lower end of the second screening screen plate 22. The rotation of the discharge impeller 32 can push the coal at the bottom of the second screening screen plate 22 away from the second screening screen plate 22 and then fall into the second receiving hopper. The first motor 51 drives the feeding impeller 31 and the discharge impeller 32 to rotate counterclockwise.

[0038] In this embodiment, a spray head 6 is connected to the upper end of the feeding hopper 4. The spray head 6 has spray nozzles arranged facing the feed inlet of the feeding hopper 4. After connecting the spray head 6 to an external water pipe, water is pumped into the spray head 6 through the external water pipe. The spray head 6 sprays water into the feeding hopper 4 through the spray nozzles to clean the coal in the feeding hopper 4. This reduces the coal dust adhering to the outer surface of larger coal particles and also reduces the dust generated during the operation of the coal preparation machine.

[0039] In this embodiment, the coal preparation machine also includes a reciprocating lifting device 7, and the mounting frame 1 is mounted on the reciprocating lifting device 7. The reciprocating lifting device 7 can drive the mounting frame 1 to move up and down reciprocally, which facilitates the sliding of coal on the first screening screen 21 and the second screening screen 22, and also facilitates the screening of coal powder by the first screening screen 21 and the second screening screen 22.

[0040] Specifically, the reciprocating lifting device 7 includes a base 73, a first lifting mechanism, and a second lifting mechanism; the mounting frame 1 has a first direction X and a second direction Y arranged vertically, where the first direction X is the length direction of the mounting frame 1 and the second direction Y is the width direction of the mounting frame 1. The lower ends of the first and second lifting mechanisms are connected to the upper ends of both sides of the base 73 in the first direction X; the upper ends of the first and second lifting mechanisms are connected to the lower ends of both sides of the mounting frame 1 in the first direction X; the first lifting mechanism has a first opening 711 extending along the first direction X, and the second lifting mechanism has a second opening 721 extending along the first direction X; the coal preparation machine also includes a receiving tray 8, which is disposed on the base 73 and located below the mounting frame 1, and the receiving tray 8 passes through the first opening 711 and the second opening 721. Coal powder with a particle size smaller than the screening holes of the second screening screen 22 passes through the screening holes of the second screening screen 22 from top to bottom and falls into the receiving tray 8. The first and second lifting mechanisms can drive the mounting frame 1 to move reciprocally up and down.

[0041] The reciprocating lifting device 7 further includes a first sliding member 74, a second sliding member 75, and a driving mechanism 76. The first sliding member 74 and the second sliding member 75 are slidably connected to the base 73 along the first direction X. The driving mechanism 76 is configured to drive the first sliding member 74 and the second sliding member 75 to move closer or further apart. The first lifting mechanism includes a first support member 71, and the second lifting mechanism includes a second support member 72. The lower ends of the first support member 71 and the second support member 72 are respectively hinged to the first sliding member 74 and the second sliding member 75. The hinge axes of the first support member 71 and the second support member 72 are both parallel to the second direction Y. The upper ends of the first support member 71 and the second support member 72 are respectively hinged to the lower ends of both sides of the mounting frame 1 in the first direction X. The first opening 711 and the second opening 721 are respectively provided on the first support member 71 and the second support member 72. The drive mechanism 76 drives the first slider and the second slider to move closer or further apart, thereby changing the vertical tilt angle of the first support member 71 and the second support member 72, and thus changing the height of the mounting frame 1, so as to realize the reciprocating lifting and lowering of the mounting frame 1.

[0042] In this embodiment, the drive mechanism 76 includes a tension spring 761, a second motor 762, and a cam 763. The cam 763 is rotatably connected to the base 73 and is located between the first sliding member 74 and the second sliding member 75. In the first direction X, one end of the tension spring 761 is connected to the first sliding member 74, and the other end is connected to the second sliding member 75. The first sliding member 74 and the second sliding member 75 respectively abut against the two sides of the cam 763 in the first direction X. The second motor 762 is connected to the base 73 and is drively connected to the cam 763. Under the action of the tension spring 761, the first sliding member 74 and the second sliding member 75 are always in contact with the outer side of the cam 763. The cam 763 can slide on the first sliding member 74 and the second sliding member 75. The second motor 762 drives the cam 763 to rotate, which can change the distance between the first sliding member 74 and the second sliding member 75. The arrangement of the second motor 762 and the cam 763 enables the mounting bracket 1 to have a high lifting frequency. In other embodiments of this utility model, the drive mechanism 76 can be configured as a reciprocating lifting device 7, which can be configured as four hydraulic cylinders. The upper ends of the four hydraulic cylinders are respectively connected to the lower ends of the four corners of the mounting frame 1. The four hydraulic cylinders are all arranged vertically, and the lower ends of the four hydraulic cylinders are all fixed on the base 73.

[0043] In this embodiment, to ensure the stable sliding of the first sliding member 74 and the second sliding member 75 on the base 73, a guide post 77 is provided on the base 73, and the first sliding member 74 and the second sliding member 75 are slidably sleeved on the outside of the guide post 77. Specifically, both the first sliding member 74 and the second sliding member 75 are cylindrical, and their length directions are both arranged along the second direction Y. Two guide posts 77 are provided, and their length directions are both arranged along the first direction X. The axes of the two guide posts 77 are arranged parallel and spaced apart in the second direction Y. The two ends of the first sliding member 74 are slidably sleeved on one end of the two guide posts 77 along their length directions, and the two ends of the second sliding member 75 are slidably sleeved on the other end of the two guide posts 77 along their length directions.

[0044] The first support member 71 includes a first link 712 and a second link 713 arranged parallel to each other along the second direction Y, with the interval between the first link 712 and the second link 713 forming a first opening 711; the second support member 72 includes a third link 722 and a fourth link 723 arranged parallel to each other along the second direction Y, with the interval between the third link 722 and the fourth link 723 forming a second opening 721; the upper ends of the first link 712 and the second link 713 are hinged to the lower ends of one side of the mounting frame 1 in the first direction X; the lower ends of the first link 712 and the second link 713 are hinged to the upper ends of the first sliding member 74; the upper ends of the third link 722 and the fourth link 723 are hinged to the lower ends of the mounting frame 1 on the other side in the first direction X; the lower ends of the third link 722 and the fourth link 723 are hinged to the upper ends of the second sliding member 75.

[0045] In this embodiment, in order to improve the lifting stability of the mounting frame 1, a vertically arranged column can be set at each of the four corners of the base 73. Sliding sleeves are fixedly connected to the four corners of the mounting frame 1, and each sliding sleeve is slidably sleeved on the outside of the corresponding column.

[0046] In summary, the coal preparation machine of this utility model includes a mounting frame 1, a first screening screen plate 21, a feeding hopper 4, a feeding impeller 31, and a driving device 5; the first screening screen plate 21 is connected to the mounting frame 1 and is arranged at an angle; the feeding hopper 4 is connected to the mounting frame 1 and has a discharge port 41, which is located above the higher end of the screening screen plate; the feeding impeller 31 is rotatably connected to the mounting frame 1 or the feeding hopper 4, and is located above the higher end of the first screening screen plate 21. At least a portion of the feeding impeller 31 is located in the discharge port 41; the drive device 5 is connected to the mounting frame 1 or the feeding hopper 4 and is connected to the feeding impeller 31 in a transmission manner. The drive device 5 drives the feeding impeller 31 to rotate, which can send the coal at the discharge port 41 to the higher end of the first screening screen plate 21. The coal feeding speed can be controlled by adjusting the rotation speed of the feeding impeller 31. In addition, the feeding impeller 31 can also push the coal falling on the first screening screen plate 21 to avoid coal blockage on the first screening screen plate 21.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A coal preparation machine, characterized in that, include: Mounting frame (1), first screening screen plate (21), feeding hopper (4), feeding impeller (31) and driving device (5); The first screening screen plate (21) is connected to the mounting frame (1) and the first screening screen plate (21) is arranged at an angle up and down; The feeding hopper (4) is connected to the mounting frame (1), and the feeding hopper (4) has a discharge port (41) located above the higher end of the first screening screen plate (21); The feeding impeller (31) is rotatably connected to the mounting frame (1) or the feeding hopper (4), the feeding impeller (31) is located above the higher end of the first screening screen plate (21), and at least a portion of the feeding impeller (31) is located in the discharge port (41); The drive device (5) is connected to the mounting frame (1) or the feeding hopper (4) and is connected to the feeding impeller (31) in a transmission manner.

2. The coal preparation machine according to claim 1, characterized in that, The coal preparation machine also includes a second screening screen (22) and a discharge impeller (32); the second screening screen (22) is disposed on the mounting frame (1) and located below the first screening screen (21); the discharge impeller (32) is rotatably connected to the mounting frame (1) and located between the second screening screen (22) and the first screening screen (21).

3. The coal preparation machine according to claim 2, characterized in that, The drive device (5) includes a first motor (51), a first pulley and a second pulley (52). The first motor (51) is connected to the mounting frame (1). The output end of the first motor (51) is connected to the discharge impeller (32) and the first pulley. The second pulley (52) is connected to the feeding impeller (31). The second pulley (52) and the first pulley are driven by a belt.

4. The coal preparation machine according to claim 1, characterized in that, The upper end of the feeding hopper (4) is connected to a spray head (6), and the spray head (6) has a spray nozzle arranged toward the feed inlet of the feeding hopper (4).

5. The coal preparation machine according to any one of claims 1 to 4, characterized in that, The coal preparation machine also includes a reciprocating lifting device (7), and the mounting frame (1) is mounted on the reciprocating lifting device (7).

6. The coal preparation machine according to claim 5, characterized in that, The reciprocating lifting device (7) includes a base (73), a first lifting mechanism, and a second lifting mechanism; The mounting bracket (1) has a first direction (X) and a second direction (Y) arranged vertically. The lower ends of the first lifting mechanism and the second lifting mechanism are connected to the upper ends of the base (73) on both sides in the first direction (X). The upper ends of the first lifting mechanism and the second lifting mechanism are connected to the lower ends of the mounting bracket (1) on both sides in the first direction (X). The first lifting mechanism has a first opening (711) that extends through the first direction (X), and the second lifting mechanism has a second opening (721) that extends through the first direction (X). The coal preparation machine also includes a receiving tray (8), which is disposed on the base (73) and located below the mounting frame (1). The receiving tray (8) passes through the first opening (711) and the second opening (721).

7. The coal preparation machine according to claim 6, characterized in that, The reciprocating lifting device (7) further includes a first sliding member (74), a second sliding member (75), and a driving mechanism (76); the first sliding member (74) and the second sliding member (75) are slidably connected to the base (73) along the first direction (X), and the driving mechanism (76) is configured to drive the first sliding member (74) and the second sliding member (75) to move closer to or further away from each other; The first lifting mechanism includes a first support member (71), and the second lifting mechanism includes a second support member (72). The lower ends of the first support member (71) and the second support member (72) are respectively hinged to the first sliding member (74) and the second sliding member (75). The hinge axis of the first support member (71) and the hinge axis of the second support member (72) are both parallel to the second direction (Y). The upper ends of the first support member (71) and the upper ends of the second support member (72) are respectively hinged to the lower ends of the mounting bracket (1) on both sides in the first direction (X). The first opening (711) and the second opening (721) are respectively provided on the first support member (71) and the second support member (72).

8. The coal preparation machine according to claim 7, characterized in that, The drive mechanism (76) includes a tension spring (761), a second motor (762), and a cam (763); The cam member (763) is rotatably connected to the base (73), and the cam member (763) is located between the first sliding member (74) and the second sliding member (75); in the first direction (X), one end of the tension spring (761) is connected to the first sliding member (74), and the other end is connected to the second sliding member (75), and the first sliding member (74) and the second sliding member (75) respectively abut against the two sides of the cam member (763) in the first direction (X); The second motor (762) is connected to the base (73), and the second motor (762) is connected to the cam (763) in a transmission connection.

9. The coal preparation machine according to claim 7, characterized in that, The reciprocating lifting device (7) further includes a guide column (77), which is connected to the base (73). The first sliding member (74) and the second sliding member (75) are slidably sleeved on the outside of the guide column (77).

10. The coal preparation machine according to claim 7, characterized in that, The first support member (71) includes a first link (712) and a second link (713) arranged parallel to each other along the second direction (Y), and the gap between the first link (712) and the second link (713) forms the first opening (711); the second support member (72) includes a third link (722) and a fourth link (723) arranged parallel to each other along the second direction (Y), and the gap between the third link (722) and the fourth link (723) forms the second opening (721); The upper end of the first connecting rod (712) and the upper end of the second connecting rod (713) are hinged to the lower end of the mounting bracket (1) on one side in the first direction (X); the lower end of the first connecting rod (712) and the lower end of the second connecting rod (713) are hinged to the upper end of the first sliding member (74); The upper ends of the third link (722) and the fourth link (723) are hinged to the lower end of the mounting bracket (1) on the other side in the first direction (X); the lower ends of the third link (722) and the fourth link (723) are hinged to the upper end of the second sliding member (75).

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