Lifting mechanism and coal leveling system

Abstract

The utility model relates to the technical field of coal leveling equipment, in particular to a lifting mechanism and a coal leveling system. The utility model provides a lifting mechanism. The lifting mechanism comprises a driving motor, a first transmission part, a second transmission part and a clamping assembly. The first transmission part is arranged on the gantry frame and extends in the first direction. The second transmission part is in transmission connection with the driving motor and the first transmission part; the lifting frame is connected with the driving motor, and the driving motor drives the second transmission part to move on the first transmission part in the first direction, so that the driving motor and the lifting frame move in the first direction; one end of the clamping assembly is connected with the lifting frame, and the other end of the clamping assembly is connected with the gantry frame and can move on the gantry frame in the first direction. The driving motor, the first transmission part and the second transmission part are matched, so that the coal leveling scraper has a driving force for descending, and the depth of the coal leveling scraper pricking into a coal pile can be controlled; and the holding and clamping assembly is matched with the gantry frame, so that the coal leveling scraper can bear larger load.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-leveling equipment, in particular to a lifting mechanism and a coal-leveling system. Background Art

[0002] In order to prevent the coal in the carriage from spilling during transportation, coal leveling operations are required. The coal leveling system came into being. The coal leveling system generally includes a gantry frame erected above the railway, a lifting frame and a drive assembly. The lifting frame is provided with a coal leveling scraper. The lifting frame is arranged on the gantry frame and can move up and down to approach or move away from the carriage. The drive assembly is used to drive the lifting frame to move on the gantry frame.

[0003] In the prior art, the driving assembly generally adopts a winch, a trapezoidal lead screw or a hydraulic cylinder; however, the winch is used to drive the lifting frame to move downward on the gantry frame, which completely relies on the self-gravity of the lifting frame and has no downward driving force. The depth to which the flat coal scraper penetrates into the coal pile is uncontrollable; when the trapezoidal lead screw is used to drive the lifting frame to move up and down on the gantry frame, the stroke of the trapezoidal lead screw is large, resulting in a very high overall height of the equipment. At the same time, if the flat coal scraper penetrates into the coal pile to a large depth, the lead screw will be bent. In addition, lightning protection measures are required for the lead screw at a very high altitude. However, since the flat coal system is mostly made of steel, there are still safety hazards; the cost of using a hydraulic cylinder to drive the lifting frame to move up and down on the gantry frame is relatively high, and the hydraulic system is prone to hydraulic oil solidification in cold areas in winter, and the maintenance cost is relatively high.

[0004] In view of this, how to improve the above problems has become the focus of technical personnel in this field. Utility Model Content

[0005] The main purpose of the utility model is to provide a lifting mechanism, the descending stroke of which is controllable, not affected by the ambient temperature, and capable of bearing a larger load; the utility model also provides a coal leveling system including the lifting mechanism.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a lifting mechanism for a coal-leveling system, wherein the coal-leveling system comprises a gantry frame and a lifting frame, and a coal-leveling scraper is arranged on the lifting frame; the lifting mechanism comprises: a driving motor, a first transmission member, a second transmission member and a clamping assembly;

[0007] The first transmission member is disposed on the gantry frame and extends along a first direction;

[0008] The second transmission member is in transmission connection with the driving motor, and the second transmission member is also in transmission connection with the first transmission member;

[0009] The lifting frame is connected to the driving motor, and the driving motor drives the second transmission member to move along the first direction on the first transmission member, so that the driving motor and the lifting frame can move along the first direction;

[0010] One end of the clamping assembly is connected to the lifting frame, and the other end is connected to the gantry frame, and the clamping assembly can move along a first direction on the gantry frame.

[0011] Furthermore, the card holding assembly includes a frame mainboard, and the frame mainboard is connected to the lifting frame; the driving motor is installed on the frame mainboard.

[0012] Furthermore, the first transmission member is disposed on both sides of the gantry frame; and the drive motor, the second transmission member and the clamping assembly are correspondingly disposed on both sides of the lifting frame.

[0013] Furthermore, it also includes a guide rail; the guide rail is fixed on the gantry frame and extends along the first direction; the clamping assembly is connected to the guide rail and can move on the guide rail along the extension direction of the guide rail.

[0014] Furthermore, the card holding assembly includes a plurality of guide wheels;

[0015] The guide rail is in a long strip structure, and has four adjacent side surfaces; one of the side surfaces of the guide rail is connected to the gantry frame, and the other three side surfaces of the guide rail are all rollingly connected to the guide wheels.

[0016] Furthermore, a plurality of guide rails are provided on one side of the gantry frame, and each guide rail is correspondingly provided with a plurality of guide wheels.

[0017] Furthermore, the first transmission member is a rack, and the second transmission member is a gear matching the rack; the non-tooth surface of the rack is rollingly connected with at least one guide wheel.

[0018] Furthermore, the guide wheel includes a wheel body, a bearing, an end cover and a sealing assembly;

[0019] The wheel body is annular in structure, and the inner edge of the wheel body is provided with a step surface;

[0020] The bearing is arranged in the wheel body, the end covers are arranged at both ends of the wheel body, and the end covers are connected to the step surface, and the sealing components are arranged at both ends of the bearing.

[0021] Furthermore, the sealing assembly includes lip sealing rings arranged at both ends of the bearing, and a dustproof gasket arranged between the end cover and the step surface.

[0022] Another embodiment of the utility model further provides a coal leveling system, including the lifting mechanism described in any of the above embodiments.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a lifting mechanism for a coal leveling system, which includes a gantry frame and a lifting frame, and the lifting frame is provided with a coal leveling scraper; the lifting mechanism includes: a driving motor, a first transmission member, a second transmission member and a clamping assembly; the first transmission member is provided on the gantry frame and extends along a first direction; the second transmission member is drivingly connected to the driving motor, and the first transmission member is also drivingly connected to the first transmission member; the lifting frame is connected to the driving motor, and the driving motor drives the second transmission member to move on the first transmission member along the first direction, so that the driving motor and the lifting frame can move along the first direction; one end of the clamping assembly is connected to the lifting frame, and the other end is connected to the gantry frame, and the clamping assembly can move on the gantry frame along the first direction.

[0025] Through the cooperation of the driving motor, the first transmission member and the second transmission member, the flat coal scraper is provided with a descending driving force, which can control the depth of the flat coal scraper penetrating into the coal pile and is not affected by the ambient temperature; and the clamping assembly cooperates with the gantry frame, so that the flat coal scraper can bear a larger load. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a flat coal system provided by an embodiment of the utility model;

[0028] Figure 2 for Figure 1 A local enlarged view of point A;

[0029] Figure 3 A three-dimensional diagram of a card holding assembly provided in an embodiment of the utility model;

[0030] Figure 4 A plan view of a card holding assembly provided in an embodiment of the utility model;

[0031] Figure 5 An exploded view of a guide wheel provided in an embodiment of the utility model.

[0032] Icon: 11-gantry frame; 111-column; 12-lifting frame;

[0033] 21-driving motor; 22-first transmission member; 23-second transmission member; 24-guide rail;

[0034] 3-cage assembly; 31-frame mainboard; 32-guide wheel; 321-wheel body; 322-bearing; 323-end cover; 324-lip seal ring; 325-dustproof gasket; 326-wheel axle; 327-locking nut. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] like Figures 1 to 5 As shown, an embodiment of the utility model provides a lifting mechanism for a coal leveling system, the coal leveling system includes a gantry frame 11 and a lifting frame 12, and the lifting frame 12 is provided with a coal leveling scraper; the lifting mechanism includes: a driving motor 21, a first transmission member 22, a second transmission member 23 and a clamping assembly 3; the first transmission member 22 is arranged on the gantry frame 11 and extends along the first direction; the second transmission member 23 is transmission-connected to the driving motor 21, and the second transmission member 23 is also transmission-connected to the first transmission member 22; the lifting frame 12 is connected to the driving motor 21, and the driving motor 21 drives the second transmission member 23 to move on the first transmission member 22 along the first direction, so that the driving motor 21 and the lifting frame 12 can move along the first direction; one end of the clamping assembly 3 is connected to the lifting frame 12, and the other end is connected to the gantry frame 11, and the clamping assembly 3 can move on the gantry frame 11 along the first direction.

[0037] The present embodiment provides a lifting mechanism for a coal-leveling system, which further includes a gantry frame 11, a lifting frame 12, and a coal-leveling scraper; the gantry frame 11 is supported as an integral structure, which is erected above the train track, and has a crossbeam and columns 111 on both sides of the crossbeam; the lifting frame 12 is used to install the coal-leveling scraper, and the lifting frame 12 is installed on the gantry frame 11 through the above-mentioned lifting mechanism, and the lifting frame 12 can move along a first direction on the gantry frame 11, and the first direction in the present embodiment is usually a vertical direction. When in use, under the action of the lifting mechanism, the lifting frame 12 and the coal-leveling scraper on the lifting frame 12 can move toward the direction close to the carriage to perform coal-leveling operations, or move away from the carriage so that the carriage passes through the coal-leveling system.

[0038] The lifting mechanism includes a driving motor 21, a first transmission member 22, a second transmission member 23 and a clamping assembly 3; the first transmission member 22 is arranged on the gantry frame 11, preferably fixed on the column 111 of the gantry frame 11; the first transmission member 22 extends along the first direction, and is used to provide guidance and support for the second transmission member 23; the driving motor 21 and the second transmission member 23 are both arranged on the lifting frame 12, and the second transmission member 23 is connected to the driving motor 21, and the second transmission member 23 is connected to the first transmission member 22, and the driving motor 21 is used to provide power for the second transmission member 23, so that the second transmission member 23 can be on the first transmission member 22 along the first transmission member The lifting frame 12 is provided with a clamping assembly 3, and the clamping assembly 3 is also connected to the gantry frame 11. The clamping assembly 3 is preferably connected to the column 111 of the gantry frame 11. When the lifting frame 12 moves along the first direction under the action of the driving motor 21, the first transmission member 22 and the second transmission member 23, the clamping assembly 3 provided on the lifting frame 12 moves synchronously with the lifting frame 12. Since the clamping assembly 3 is also connected to the gantry frame 11, the clamping assembly 3 cooperates with the gantry frame 11 to improve the stability of the lifting frame 12 and withstand the force of the coal pile on the coal-leveling scraper, so that the coal-leveling scraper can withstand a larger load during coal-leveling operations.

[0039] The lifting mechanism provided in this embodiment realizes the driving force for the coal scraper to descend by cooperating with the driving motor 21, the first transmission member 22 and the second transmission member 23, and can control the depth of the coal scraper penetrating into the coal pile while not being affected by the ambient temperature; and the clamping assembly 3 cooperates with the gantry frame 11, so that the coal scraper can bear a larger load.

[0040] Preferably, in this embodiment, the first transmission member 22 is a rack, and correspondingly, the second transmission member 23 is a gear matched with the rack, and the gear is meshed with the rack; the gear is driven to rotate by the driving motor 21, thereby driving the lifting frame 12 connected to the driving motor 21 to move along the extension direction of the rack. The lifting mechanism adopts gear and rack transmission, which has high transmission efficiency, strong load capacity, and more accurate positioning.

[0041] It is understandable that, in this embodiment, the first transmission member 22 can also be a lead screw, and the second transmission member 23 can be a nut matched with the lead screw; the nut is driven to rotate by the driving motor 21, so that the nut moves along the extension direction of the lead screw. Although the lead screw and the nut cannot withstand a large load when they are matched, this embodiment can solve this problem well by providing a clamping assembly 3 matched with the gantry frame 11.

[0042] The lifting mechanism provided by the embodiment of the utility model is as follows Figures 2 to 4As shown, the card holding assembly 3 includes a frame main board 31 , which is connected to the lifting frame 12 ; the driving motor 21 is installed on the frame main board 31 .

[0043] In this embodiment, the drive motor 21 is connected to the lifting frame 12 through the clamping assembly 3, rather than the clamping assembly 3 and the drive motor 21 being independently arranged; by integrating the clamping assembly 3, the drive motor 21 and the second transmission member 23 of the lifting mechanism, the installation of the lifting mechanism can be facilitated, making the lifting mechanism more integrated and facilitating the layout and maintenance of the lifting mechanism.

[0044] The lifting mechanism provided by the embodiment of the utility model is as follows Figures 1 to 4 As shown, the first transmission member 22 is disposed on both sides of the gantry frame 11 ; the driving motor 21 , the second transmission member 23 and the clamping assembly 3 are correspondingly disposed on both sides of the lifting frame 12 .

[0045] The above content mentioned that the gantry frame 11 includes a crossbeam and columns 111 on both sides of the crossbeam. In this embodiment, the two columns 111 of the gantry frame 11 are provided with a first transmission member 22. Correspondingly, the two sides of the lifting frame 12 are provided with a driving motor 21 and a second transmission member 23 that cooperate with the first transmission member 22. Preferably, the two sides of the lifting frame 12 are provided with a clamping assembly 3. Through the above setting, compared with only setting the first transmission member 22 on the column 111 on one side of the gantry frame 11, the safety and stability of the lifting frame 12 can be improved, and the flat coal scraper can withstand a larger load.

[0046] The lifting mechanism provided by the embodiment of the utility model is as follows Figures 1 to 4 As shown, it also includes a guide rail 24; the guide rail 24 is fixed on the gantry frame 11 and extends along the first direction; the clamping assembly 3 is connected to the guide rail 24 and can move on the guide rail 24 along the extension direction of the guide rail 24.

[0047] In this embodiment, the lifting mechanism further includes a guide rail 24 that cooperates with the clamping assembly 3; the guide rail 24 extends along the first direction, and the guide rail 24 is fixed on the gantry frame 11, specifically installed on the column 111 of the gantry frame 11, so as to improve the stability and connection strength of the guide rail 24. The clamping assembly 3 cooperates with the guide rail 24 on the gantry frame 11 to avoid affecting the normal use of the gantry frame 11; moreover, by controlling the number of the guide rails 24, clamping in multiple directions can be achieved, further improving the load-bearing capacity of the flat coal scraper.

[0048] The lifting mechanism provided by the embodiment of the utility model is as follows Figures 1 to 4As shown, the clamping assembly 3 includes a plurality of guide wheels 32; the guide rail 24 is in a long strip structure, and the guide rail 24 has four adjacent side surfaces; one side surface of the guide rail 24 is connected to the gantry frame 11, and the other three side surfaces of the guide rail 24 are rollingly connected to the guide wheels 32.

[0049] In this embodiment, the above-mentioned clamping assembly 3 includes a plurality of guide wheels 32, which are rotatably arranged on the frame main board 31. In order to improve the connection strength, a reinforcing rib is provided at the bend of the frame main board 31. The guide rail 24 has four adjacent side surfaces, one of which is connected to the column 111 of the gantry frame 11 by welding or screw connection, and the other three side surfaces are all provided with guide wheels 32. The guide wheels 32 of the clamping assembly 3 are limited in three directions by the guide rail 24, thereby improving its load-bearing capacity. Rolling friction is adopted between the guide rail 24 and the clamping assembly 3, thereby improving the service life of the guide rail 24 and reducing the production cost.

[0050] For the convenience of description, the above-mentioned guide wheel 32 is divided into a first guide wheel, a second guide wheel and a third guide wheel, wherein the first guide wheel and the second guide wheel are arranged at an interval, and the axes of the first guide wheel and the second guide wheel are parallel; the third guide wheel is arranged between the first guide wheel and the second guide wheel, and the axis of the third guide wheel is perpendicular to the axis of the first guide wheel and the axis of the second guide wheel; the first guide wheel and the second guide wheel are respectively rollingly connected to the two side surfaces adjacent to the guide rail 24 and the column 111 of the gantry frame 11, and the third guide wheel is rollingly connected to the side of the guide rail 24 away from the column 111 of the gantry frame 11; the first guide wheel, the second guide wheel and the third guide wheel form a guide wheel group, and the number of the first guide wheel, the second guide wheel and the third guide wheel in the same guide wheel group can be multiple or one; for example, Figures 2 to 4 As shown in , the guide wheel group includes a first guide wheel, a second guide wheel and two third guide wheels; each guide rail 24 can be configured with multiple sets of guide wheel groups.

[0051] It can be understood that in this embodiment, the clamping assembly 3 can also be provided with a slider to cooperate with the long guide rail 24, which can also achieve the purpose of bearing the force of the coal pile on the coal scraper in this embodiment, so that the coal scraper can withstand the increased load during the coal flattening operation.

[0052] It can be understood that, in this embodiment, the above-mentioned guide rail 24 can also be grooved. By setting a slider or the above-mentioned guide wheel 32 to cooperate with the groove, the purpose of bearing the force of the coal pile on the coal-leveling scraper in this embodiment can also be achieved, so that the coal-leveling scraper can withstand a larger load during coal-leveling operations.

[0053] The lifting mechanism provided by the embodiment of the utility model is as follows Figures 1 to 4 As shown, a plurality of guide rails 24 are provided on one side of the gantry frame 11 , and each guide rail 24 is correspondingly provided with a plurality of guide wheels 32 .

[0054] As mentioned above, the columns 111 on both sides of the gantry frame 11 are provided with guide rails 24 to improve the load bearing capacity; in order to further improve the load bearing capacity, a plurality of guide rails 24 are provided on each side of the gantry frame 11, and correspondingly, the clamping assembly 3 is provided with a plurality of groups of the above-mentioned guide wheel groups to cooperate with each guide rail 24. Preferably, in this embodiment, the guide rails 24 are provided on the left and right sides of the column 111, wherein the left and right sides are the sides perpendicular to the driving direction of the carriage.

[0055] The lifting mechanism provided by the embodiment of the utility model is as follows Figures 1 to 4 As shown, the first transmission member 22 is a rack, and the second transmission member 23 is a gear matching the rack; the non-tooth surface of the rack is rollingly connected with at least one guide wheel 32.

[0056] As mentioned above, the first transmission member 22 is a rack, and the second transmission member 23 is a gear. In order to prevent the gear and the rack from being separated during the transmission process, some guide wheels 32 on the clamping assembly 3 are also rotatably connected to the non-tooth surface of the rack. Preferably, in order to facilitate the arrangement and reduce the cost, a plurality of guide wheels 32 are only provided on the side of the rack away from the teeth.

[0057] The lifting mechanism provided by the embodiment of the utility model is as follows Figures 2 to 5 As shown, the guide wheel 32 includes a wheel body 321, a bearing 322, an end cover 323 and a sealing assembly; the wheel body 321 is annular in structure, and a step surface is provided on the inner edge of the wheel body 321; the bearing 322 is arranged in the wheel body 321, and end covers 323 are provided at both ends of the wheel body 321, and the end covers 323 are connected to the step surface, and sealing assemblies are provided at both ends of the bearing 322.

[0058] In this embodiment, the wheel body 321 is annular in structure, and the bearing 322 is arranged on the inner side of the wheel body 321; the inner edge of the wheel body 321 is provided with a step surface for installing the end cover 323, and the two ends of the wheel body 321 are closed by the end cover 323, and the end cover 323 can be fixed on the step surface by screws; the sealing assembly is arranged at the two ends of the bearing 322. In this embodiment, the guide wheel 32 is used in a bad working condition, and there is coal ash in the air at the work site. In order to prevent the coal ash from entering the wheel body 321, the two ends of the bearing 322 are sealed by the sealing assembly to extend the service life of the bearing 322.

[0059] Furthermore, the lifting mechanism provided in the embodiment of the utility model is as follows: Figure 5 As shown, the sealing assembly includes lip seals 324 disposed at both ends of the bearing 322, and a dustproof gasket 325 disposed between the end cover 323 and the step surface.

[0060] In this embodiment, the sealing assembly includes two lip seals 324, which are arranged at both ends of the bearing 322. The lip seals 324 are deformed by the lip opening under the action of the hydraulic pressure, so that the lip edge is close to the sealing surface, and the lip seals 324 have the ability to automatically compensate after wear, and the sealing effect is good. A dustproof sealing pad is arranged between the end cover 323 and the step surface, and the dustproof sealing pad can be a rubber pad or a silicone pad. The lip seal 324 cooperates with the dustproof sealing pad to effectively prevent coal ash from entering the wheel body 321, thereby extending the service life of the bearing 322 and bringing great convenience to the later maintenance.

[0061] In this embodiment, the guide wheel 32 further includes an axle 326 and a locking nut 327. One end of the axle 326 is a threaded section. The axle 326 is passed through the wheel body 321 and is locked and fixed by the locking nut 327. An anti-loosening washer is provided between the locking nut 327 and the end cover 323 to prevent the locking nut 327 from loosening.

[0062] Another embodiment of the utility model further provides a coal leveling system, comprising a lifting mechanism as described in any of the above embodiments.

[0063] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting mechanism for a coal leveling system, the coal leveling system comprising a gantry frame (11) and a lifting frame (12), the lifting frame (12) being provided with a coal leveling scraper; characterized in that: The lifting mechanism comprises: a driving motor (21), a first transmission member (22), a second transmission member (23) and a clamping assembly (3); The first transmission member (22) is arranged on the gantry frame (11) and extends along a first direction; The second transmission member (23) is in transmission connection with the drive motor (21), and the second transmission member (23) is also in transmission connection with the first transmission member (22); The lifting frame (12) is connected to the driving motor (21), and the driving motor (21) drives the second transmission member (23) to move along the first transmission member (22) in a first direction, so that the driving motor (21) and the lifting frame (12) can move in the first direction; One end of the clamping assembly (3) is connected to the lifting frame (12), and the other end is connected to the gantry frame (11), and the clamping assembly (3) is capable of moving along a first direction on the gantry frame (11).

2. The lifting mechanism according to claim 1, characterized in that: The card holding assembly (3) comprises a frame mainboard (31), wherein the frame mainboard (31) is connected to the lifting frame (12); and the drive motor (21) is mounted on the frame mainboard (31).

3. The lifting mechanism according to claim 1, characterized in that: The first transmission member (22) is provided on both sides of the gantry frame (11); the drive motor (21), the second transmission member (23) and the clamping assembly (3) are correspondingly provided on both sides of the lifting frame (12).

4. The lifting mechanism according to any one of claims 1 to 3, characterized in that: It also includes a guide rail (24); the guide rail (24) is fixed on the gantry frame (11) and extends along a first direction; the clamping assembly (3) is connected to the guide rail (24) and can move on the guide rail (24) along the extension direction of the guide rail (24).

5. The lifting mechanism according to claim 4, characterized in that: The clamping assembly (3) comprises a plurality of guide wheels (32); The guide rail (24) is in the form of an elongated strip, and has four adjacent side surfaces; one of the side surfaces of the guide rail (24) is connected to the gantry frame (11), and the other three side surfaces of the guide rail (24) are all rollingly connected to the guide wheels (32).

6. The lifting mechanism according to claim 5, characterized in that: A plurality of guide rails (24) are provided on one side of the gantry frame (11), and each guide rail (24) is correspondingly provided with a plurality of guide wheels (32).

7. The lifting mechanism according to claim 5, characterized in that: The first transmission member (22) is a rack, and the second transmission member (23) is a gear matching the rack; the non-tooth surface of the rack is rollingly connected to at least one guide wheel (32).

8. The lifting mechanism according to claim 7, characterized in that: The guide wheel (32) comprises a wheel body (321), a bearing (322), an end cover (323) and a sealing assembly; The wheel body (321) is an annular structure, and the inner edge of the wheel body (321) is provided with a step surface; The bearing (322) is arranged in the wheel body (321), the end covers (323) are arranged at both ends of the wheel body (321), and the end covers (323) are connected to the step surface, and the sealing components are arranged at both ends of the bearing (322).

9. The lifting mechanism according to claim 8, characterized in that: The sealing assembly comprises lip seals (324) provided at both ends of the bearing (322), and a dustproof gasket (325) provided between the end cover (323) and the step surface.

10. A coal leveling system, characterized in that: It comprises a lifting mechanism as described in any one of claims 1 to 9.

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