Rail wheel device capable of resisting axial force

By using tapered roller bearings as the slewing support of the track wheels, combined with double-rib and single-rib driven wheel sets, the problem of easy bearing damage is solved, the service life of the bearings is extended and the maintenance frequency is reduced.

CN223356650UActive Publication Date: 2025-09-19SHANGHAITANGSHIJIANHUA PILE CO LTD
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Patent Information

Application Number
CN202422890444.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2025-09-19
Estimated Expiration
2034-11-26

AI Technical Summary

Technical Problem

The bearings of existing rail wheel devices are easily damaged by impact forces and are easily damaged by friction when running on tracks with poor parallelism, resulting in a short service life and frequent maintenance.

Method used

The use of tapered roller bearings as the slewing support of the track wheels, combined with double-rib and single-rib driven wheel sets, allows the bearings to withstand axial forces, reducing the risk of friction and impact damage.

Benefits of technology

Extend the service life of bearings, reduce the number of maintenance times, reduce the number of maintenance times, reduce the damage rate of bearings, and reduce the damage rate of bearings.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a track wheel device for resisting axial force, which comprises an X-axis chassis weldment, an X-axis component and a track group, the track group is placed on the ground, and the X-axis component comprises a double-flange driven wheel group, a single-flange driven wheel group and an X-axis driving wheel group. A double-flange driven wheel set, a single-flange driven wheel set and an X-axis driving wheel set are installed on an X-axis wheel set installation plate of an X-axis chassis weldment respectively, the double-flange driven wheel set, the single-flange driven wheel set and the X-axis driving wheel set are placed on a rail set, and an X-axis motor component, an X-axis driving chain and the X-axis driving wheel set form a power set of an X-axis component. The problems that in the operation process, the upper pipe die of the flatcar advances to impact equipment to generate certain impact force, a bearing is not prone to being damaged, and the service life of the bearing is prolonged; (2) a track constructed on the ground is generally poor in parallelism precision, collision friction is easily generated between the track and the track in the running process, and the axial force borne by a bearing can be effectively overcome;
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Description

Technical Field

[0001] The utility model relates to the field of pipe pile production, in particular to the field of a tensioning process of prestressed pipe piles, and specifically refers to a track wheel device for resisting axial force. Background Art

[0002] At present, the track wheels on the equipment usually adopt the rotation method of deep groove ball bearings, which has the following disadvantages:

[0003] (1) During the operation, the forward movement of the pipe mold on the flat car will produce a certain impact force on the equipment, which may easily damage the bearings;

[0004] (2) The parallelism accuracy of the track constructed on the ground is usually poor, and it is easy to collide and rub with the track during driving, causing damage to the deep groove ball bearings. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a rail wheel device that has a simple structure, high precision and a wide range of applications and can resist axial forces.

[0006] In order to achieve the above-mentioned purpose, the rail wheel device of the present invention for resisting axial force is as follows:

[0007] The track wheel device for resisting axial force has the following main features: the device includes an X-axis chassis weldment, an X-axis component and a track group, the track group is placed on the ground, the X-axis component includes a double-rib driven wheel group, a single-rib driven wheel group and an X-axis driving wheel group, a group of double-rib driven wheel groups, a group of single-rib driven wheel groups and a group of X-axis driving wheel groups are respectively mounted on the X-axis wheel group mounting plates of the X-axis chassis weldment, the double-rib driven wheel group, the single-rib driven wheel group and the X-axis driving wheel group are placed on the track group, the X-axis motor component, the X-axis drive chain and the X-axis driving wheel group constitute a power group of the X-axis component, and the X-axis driving wheel group drives the double-rib driven wheel group and the single-rib driven wheel group to move back and forth along the track group.

[0008] Preferably, the X-axis component also includes an X-axis motor component, a Y-axis motor component, and an X-axis drive chain. The X-axis motor component is located on the side of the X-axis chassis weldment, the Y-axis motor component is located on the X-axis chassis weldment, the double-rib driven wheel group and the single-rib driven wheel group are respectively located on both sides of the X-axis chassis weldment, the X-axis driving wheel group passes through the X-axis chassis weldment, and the X-axis drive chain is wrapped around the X-axis driving wheel group.

[0009] Preferably, the X-axis chassis weldment is provided with a Y-axis track, an X-axis positioning weldment, an X-axis wheel assembly mounting plate, a Y-axis motor seat, a Y-axis driven wheel seat and an X-axis motor fixing seat. The Y-axis track, X-axis positioning weldment, X-axis wheel assembly mounting plate, Y-axis motor seat, Y-axis driven wheel seat and X-axis motor fixing seat are welded to the X-axis chassis weldment. The Y-axis track is laterally installed on the X-axis chassis weldment, the X-axis positioning weldment is installed on the side of the X-axis chassis weldment, the X-axis wheel assembly mounting plate is installed at the four corners of the X-axis chassis weldment, the Y-axis motor seat and the Y-axis driven wheel seat are respectively installed on both sides of the X-axis chassis weldment, and the X-axis motor fixing seat is installed on the X-axis chassis weldment; the Y-axis track, X-axis positioning weldment and X-axis wheel assembly mounting plate are mounting plates for the double-rib driven wheel group, the single-rib driven wheel group and the X-axis driving wheel group.

[0010] Preferably, the double-rib driven wheel assembly includes a driven wheel seat, a tapered roller bearing, a bushing, a double-rib wheel, a driven shaft, an end plate and bolts. The double-rib driven wheel assembly is assembled from the driven wheel seat, the tapered roller bearing, the bushing, the double-rib wheel, the driven shaft, an end plate and bolts. The driven wheel seat is installed with two tapered roller bearings and two bushings, the double-rib wheel is installed on the driven wheel seat, and both ends of the driven shaft are locked with an end plate by bolts.

[0011] Preferably, the single-rib driven wheel assembly includes a driven wheel seat, a tapered roller bearing, a bushing, a driven shaft, a shaft end plate, bolts and a single-rib wheel. The single-rib driven wheel assembly is assembled from the driven wheel seat, the tapered roller bearing, the bushing, the driven shaft, the shaft end plate, bolts and the single-rib wheel. The driven wheel seat is installed with two tapered roller bearings and two bushings, the single-rib wheel is installed on the driven wheel seat, and both ends of the driven shaft are locked with a shaft end plate by bolts.

[0012] Preferably, the X-axis driving wheel group consists of a driven wheel seat, a tapered roller bearing, a bushing, a double-flange wheel, an end plate, a bolt, a single-flange wheel, a flat key, a sprocket and a transmission shaft. The sprocket and the transmission shaft are connected by a flat key, the single-flange wheel and the transmission shaft are connected by a flat key, the double-flange wheel and the transmission shaft are connected by a flat key, and both ends of the transmission shaft are locked with a shaft end plate by bolts. Each group of driven wheel seats is installed with two tapered roller bearings and two bushings, one group of driven wheel seats is installed with a single-flange wheel, and the other group is installed with a double-flange wheel.

[0013] The utility model adopts the rail wheel device for resisting axial force, and replaces the rotary support of the rail wheel with a tapered roller bearing, so that the bearing can withstand a certain axial force, prolongs the service life of the bearing, reduces the number of maintenance, and solves the following problems: (1) During the operation, the forward movement of the pipe mold on the flat car collides with the equipment, which produces a certain impact force, is not easy to damage the bearing, and prolongs the service life of the bearing; (2) The parallelism accuracy of the track constructed on the ground is usually poor, and it is easy to collide and rub with the track during driving, which can effectively overcome the axial force borne by the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the X-axis component of the rail wheel device for resisting axial force according to the present invention.

[0015] Figure 2 This is a structural schematic diagram of the X-axis chassis weldment of the rail wheel device for resisting axial force in the present invention.

[0016] Figure 3 This is a schematic structural diagram of a double-rib driven wheel assembly of a rail wheel device for resisting axial force according to the present invention.

[0017] Figure 4 This is a schematic structural diagram of a single-rib driven wheel assembly of a rail wheel device for resisting axial force according to the present invention.

[0018] Figure 5 This is a schematic structural diagram of the X-axis driving wheel group of the rail wheel device for resisting axial force of the present invention.

[0019] Reference numerals:

[0020] 1 X-axis component

[0021] 7-track set

[0022] 10X axle chassis weldment

[0023] 11X-axis motor components

[0024] 12Y-axis motor components

[0025] 13 double rib driven wheel set

[0026] 14 single rib driven wheel set

[0027] 16X shaft drive chain

[0028] 17X axis driving wheel set

[0029] 101Y-axis track

[0030] 102X axis positioning weldment

[0031] 103X axle wheel assembly mounting plate

[0032] 121Y-axis motor seat

[0033] 127Y-axis driven wheel seat

[0034] 111X-axis motor fixing seat

[0035] 130 driven wheel seat

[0036] 131 tapered roller bearings

[0037] 132 bushing

[0038] 133 double rib wheel

[0039] 134 driven shaft

[0040] 135 shaft end plate

[0041] 136 bolts

[0042] 140 single sidewall wheel

[0043] 170 flat key

[0044] 171 sprocket

[0045] 172 drive shaft

[0046] 80 positioning cylinder group

[0047] 81 cover DETAILED DESCRIPTION

[0048] In order to more clearly describe the technical content of the present invention, further description will be given below in conjunction with specific embodiments.

[0049] The track wheel device of the present invention for resisting axial force includes an X-axis component 1 and a track group 7, the track group 7 is placed on the ground, the X-axis component 1 includes an X-axis chassis weldment 10, a double-rib driven wheel group 13, a single-rib driven wheel group 14, and an X-axis driving wheel group 17, a group of double-rib driven wheel groups 13, a group of single-rib driven wheel groups 14 and a group of X-axis driving wheel groups 17 are respectively installed on the X-axis wheel group mounting plate 103 of the X-axis chassis weldment 10, the double-rib driven wheel group 13, the single-rib driven wheel group 14 and the X-axis driving wheel group 17 are placed on the track group 7, the X-axis motor component 11, the X-axis drive chain 16 and the X-axis driving wheel group 17 constitute the power group of the X-axis component 1, and the X-axis driving wheel group 17 drives the double-rib driven wheel group 13 and the single-rib driven wheel group 14 to move back and forth along the track group 7.

[0050] As a preferred embodiment of the present invention, the X-axis component 1 also includes an X-axis motor component 11, a Y-axis motor component 12, and an X-axis drive chain 16. The X-axis motor component 11 is located on the side of the X-axis chassis weldment 10, and the Y-axis motor component 12 is located on the X-axis chassis weldment 10. The double-rib driven wheel group 13 and the single-rib driven wheel group 14 are respectively located on both sides of the X-axis chassis weldment 10. The X-axis driving wheel group 17 passes through the X-axis chassis weldment 10, and the X-axis drive chain 16 is wrapped around the X-axis driving wheel group 17.

[0051] As a preferred embodiment of the present invention, the X-axis chassis weldment 10 is provided with a Y-axis track 101, an X-axis positioning weldment 102, an X-axis wheel assembly mounting plate 103, a Y-axis motor seat 121, a Y-axis driven wheel seat 127 and an X-axis motor fixing seat 111. The Y-axis track 101, the X-axis positioning weldment 102, the X-axis wheel assembly mounting plate 103, the Y-axis motor seat 121, the Y-axis driven wheel seat 127 and the X-axis motor fixing seat 111 are welded on the X-axis chassis weldment 10, and the Y-axis track 101 is horizontally mounted on the X-axis chassis weldment 10 The X-axis positioning weldment 102 is installed on the side of the X-axis chassis weldment 10, the X-axis wheel assembly mounting plate 103 is installed at the four corners of the X-axis chassis weldment 10, the Y-axis motor seat 121 and the Y-axis driven wheel seat 127 are respectively installed on both sides of the X-axis chassis weldment 10, and the X-axis motor fixing seat 111 is installed on the X-axis chassis weldment 10; the Y-axis track 101, the X-axis positioning weldment 102, and the X-axis wheel assembly mounting plate 103 are mounting plates for the double-rib driven wheel assembly 13, the single-rib driven wheel assembly 14 and the X-axis driving wheel assembly 17.

[0052] As a preferred embodiment of the present invention, the double-rib driven wheel assembly 13 includes a driven wheel seat 130, a tapered roller bearing 131, a sleeve 132, a double-rib wheel 133, a driven shaft 134, a shaft end plate 135 and a bolt 136. The double-rib driven wheel assembly 13 is assembled by the driven wheel seat 130, the tapered roller bearing 131, the sleeve 132, the double-rib wheel 133, the driven shaft 134, the shaft end plate 135 and the bolt 136. The driven wheel seat 130 is installed with two tapered roller bearings 131 and two sleeves 132. The double-rib wheel 133 is installed on the driven wheel seat 130. The two ends of the driven shaft 134 are each locked with a shaft end plate 135 by bolts 136.

[0053] As a preferred embodiment of the present invention, the single-rib driven wheel assembly 14 includes a driven wheel seat 130, a tapered roller bearing 131, a sleeve 132, a driven shaft 134, a shaft end plate 135, a bolt 136 and a single-rib wheel 140. The single-rib driven wheel assembly 14 is assembled from the driven wheel seat 130, the tapered roller bearing 131, the sleeve 132, the driven shaft 134, the shaft end plate 135, the bolt 136 and the single-rib wheel 140. The driven wheel seat 130 is installed with two tapered roller bearings 131 and two sleeves 132. The single-rib wheel 140 is installed on the driven wheel seat 130. The two ends of the driven shaft 134 are each locked with a shaft end plate 135 by bolts 136.

[0054] As a preferred embodiment of the present utility model, the X-axis driving wheel group 17 consists of a driven wheel seat 130, a tapered roller bearing 131, a sleeve 132, a double-flange wheel 133, a shaft end plate 135, a bolt 136, a single-flange wheel 140, a flat key 170, a sprocket 171 and a transmission shaft 172, the sprocket 171 and the transmission shaft 172 are connected by a flat key 170, the single-flange wheel 140 and the transmission shaft 172 are connected by a flat key 170, the double-flange wheel 133 and the transmission shaft 172 are connected by a flat key 170, and the two ends of the transmission shaft 172 are each locked with a shaft end plate 135 by a bolt 136, each group of driven wheel seats 130 is installed with two tapered roller bearings 131 and two sleeves 132, one group of driven wheel seats 130 is installed with a single-flange wheel 140, and the other group is installed with a double-flange wheel 133.

[0055] In this embodiment, the slewing supports for the track wheels (i.e., the double-rib driven wheel assembly 13, the single-rib driven wheel assembly 14, and the X-axis driving wheel assembly 17) are replaced with tapered roller bearings 131. This allows the bearings to withstand a certain amount of axial force, extending their service life and reducing maintenance. The track wheels on one side have a double-flange structure, while the track wheels on the other side have a single-flange structure. This allows for a certain degree of parallelism deviation between the two tracks, reducing the difficulty of track installation.

[0056] The double-rib driven wheel group 13, the single-rib driven wheel group 14 and the X-axis driving wheel group 17 of the X-axis component 1 are placed on the track group 7 on the ground; the X-axis motor component 11, the X-axis driving chain 16 and the X-axis driving wheel group 17 constitute the power group of the X-axis component 1, which drives the X-axis driving wheel group 17 of the X-axis component 1 to drive the double-rib driven wheel group 13 and the single-rib driven wheel group 14 to move back and forth along the track group 7.

[0057] A set of double-rib driven wheel sets 13 , a set of single-rib driven wheel sets 14 and a set of X-axis driving wheel sets 17 are respectively mounted on the X-axis wheel set mounting plate 103 of the X-axis chassis weldment 10 .

[0058] The X-axis component 1 is assembled from an X-axis chassis weldment 10 , an X-axis motor component 11 , a Y-axis motor component 12 , a double-rib driven wheel assembly 13 , a single-rib driven wheel assembly 14 , an X-axis drive chain 16 , and an X-axis active wheel assembly 17 .

[0059] The Y-axis track 101 , the X-axis positioning weldment 102 , the X-axis wheel assembly mounting plate 103 , the Y-axis motor seat 121 , the Y-axis driven wheel seat 127 , and the X-axis motor fixing seat 111 are welded to the X-axis chassis weldment 10 .

[0060] The Y-axis track 101, the X-axis positioning weldment 102, and the X-axis wheel assembly mounting plate 103 are mounting plates for the double-rib driven wheel assembly 13, the single-rib driven wheel assembly 14, and the X-axis driving wheel assembly 17, hereinafter referred to as the X-axis wheel assembly mounting plate.

[0061] The double-rib driven wheel assembly 13 is assembled from a driven wheel seat 130 , a tapered roller bearing 131 , a shaft sleeve 132 , a double-rib wheel 133 , a driven shaft 134 , a shaft end plate 135 , and bolts 136 .

[0062] Each set of double-rib driven wheel assembly 13 is installed with two tapered roller bearings 131 and two shaft sleeves 132, and a double-rib wheel 133 is installed. The two ends of the driven shaft 134 are each locked with a shaft end plate 135 through bolts 136.

[0063] The single-rib driven wheel assembly 14 is assembled from a driven wheel seat 130 , a tapered roller bearing 131 , a shaft sleeve 132 , a driven shaft 134 , a shaft end plate 135 , bolts 136 , and a single-rib wheel 140 .

[0064] Each set of single-rib driven wheel assembly 14 is installed with two tapered roller bearings 131 and two shaft sleeves 132, and a single-rib wheel 140 is installed. The two ends of the driven shaft 134 are each locked with a shaft end plate 135 through bolts 136.

[0065] The X-axis driving wheel assembly 17 is assembled from a driven wheel seat 130, a tapered roller bearing 131, a sleeve 132, a double-rib wheel 133, an end plate 135, a bolt 136, a single-rib wheel 140, a flat key 170, a sprocket 171, and a transmission shaft 172.

[0066] The sprocket 171 and the transmission shaft 172 of the X-axis driving wheel group 17 are connected by a flat key 170, the single-flange wheel 140 and the transmission shaft 172 are connected by a flat key 170, and the double-flange wheel 133 and the transmission shaft 172 are connected by a flat key 170. Each group of driven wheel seats 130 is installed with two tapered roller bearings 131 and two shaft sleeves 132. One group of driven wheel seats 130 is installed with a single-flange wheel 140, and the other group is installed with a double-flange wheel 133. The two ends of the transmission shaft 172 are each locked with a shaft end plate 135 by bolts 136.

[0067] The single baffle wheel and double baffle wheel in the technical solution can be replaced by all single baffle wheels or double baffle wheels.

[0068] The composite bearing in this technical solution can be replaced by a roller bearing combination.

[0069] The track bearings in this technical solution are tapered roller bearings, which can also be replaced by double-row or two single-row tapered roller bearings on both sides of the track wheel.

[0070] The specific implementation scheme of this embodiment can be found in the relevant descriptions in the above embodiments and will not be repeated here.

[0071] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0072] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is at least two.

[0073] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0074] The slewing support of the track wheel is replaced with a tapered roller bearing, which allows the bearing to withstand a certain amount of axial force, extending the service life of the bearing and reducing the number of maintenance times. This solves the following problems: (1) During operation, the forward movement of the pipe mold on the flat car will produce a certain impact force on the equipment, which is not easy to damage the bearing and extend the service life of the bearing; (2) The parallelism accuracy of the track constructed on the ground is usually poor, and it is easy to collide and rub with the track during driving. This can effectively overcome the axial force borne by the bearing.

[0075] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims

1. A rail wheel device for resisting axial force, characterized in that: The device includes an X-axis chassis weldment, an X-axis component and a track group, the track group is placed on the ground, the X-axis component includes a double-rib driven wheel group, a single-rib driven wheel group, and an X-axis driving wheel group, a group of double-rib driven wheel groups, a group of single-rib driven wheel groups and a group of X-axis driving wheel groups are respectively installed on the X-axis wheel group mounting plate of the X-axis chassis weldment, the double-rib driven wheel group, the single-rib driven wheel group and the X-axis driving wheel group are placed on the track group, the X-axis motor component, the X-axis drive chain and the X-axis driving wheel group of the X-axis component constitute the power group of the X-axis component, and the X-axis driving wheel group drives the double-rib driven wheel group and the single-rib driven wheel group to move back and forth along the track group.

2. The rail wheel device for resisting axial force according to claim 1, characterized in that: The X-axis component also includes an X-axis motor component, a Y-axis motor component, and an X-axis drive chain. The X-axis motor component is located on the side of the X-axis chassis weldment, and the Y-axis motor component is located on the X-axis chassis weldment. The double-rib driven wheel group and the single-rib driven wheel group are respectively located on both sides of the X-axis chassis weldment. The X-axis driving wheel group passes through the X-axis chassis weldment, and the X-axis drive chain is wrapped around the X-axis driving wheel group.

3. The rail wheel device for resisting axial force according to claim 1, characterized in that: The X-axis chassis weldment is provided with a Y-axis track, an X-axis positioning weldment, an X-axis wheel assembly mounting plate, a Y-axis motor seat, a Y-axis driven wheel seat and an X-axis motor fixing seat. The Y-axis track, X-axis positioning weldment, X-axis wheel assembly mounting plate, Y-axis motor seat, Y-axis driven wheel seat and X-axis motor fixing seat are welded to the X-axis chassis weldment. The Y-axis track is horizontally installed on the X-axis chassis weldment, the X-axis positioning weldment is installed on the side of the X-axis chassis weldment, the X-axis wheel assembly mounting plate is installed at the four corners of the X-axis chassis weldment, the Y-axis motor seat and the Y-axis driven wheel seat are respectively installed on both sides of the X-axis chassis weldment, and the X-axis motor fixing seat is installed on the X-axis chassis weldment; the Y-axis track, X-axis positioning weldment and X-axis wheel assembly mounting plate are mounting plates for the double-rib driven wheel group, the single-rib driven wheel group and the X-axis driving wheel group.

4. The rail wheel device for resisting axial force according to claim 1, characterized in that: The double-rib driven wheel assembly includes a driven wheel seat, a tapered roller bearing, a bushing, a double-rib wheel, a driven shaft, an end plate and bolts. The double-rib driven wheel assembly is assembled from the driven wheel seat, the tapered roller bearing, the bushing, the double-rib wheel, the driven shaft, an end plate and bolts. The driven wheel seat is installed with two tapered roller bearings and two bushings. The double-rib wheel is installed on the driven wheel seat. The two ends of the driven shaft are each locked with an end plate by bolts.

5. The rail wheel device for resisting axial force according to claim 1, characterized in that: The single-rib driven wheel assembly includes a driven wheel seat, a tapered roller bearing, a bushing, a driven shaft, a shaft end plate, bolts and a single-rib wheel. The single-rib driven wheel assembly is assembled from the driven wheel seat, the tapered roller bearing, the bushing, the driven shaft, the shaft end plate, bolts and a single-rib wheel. The driven wheel seat is installed with two tapered roller bearings and two bushings. The single-rib wheel is installed on the driven wheel seat. Both ends of the driven shaft are locked with a shaft end plate by bolts.

6. The rail wheel device for resisting axial force according to claim 1, characterized in that: The X-axis driving wheel group consists of a driven wheel seat, a tapered roller bearing, a bushing, a double-flange wheel, an end plate, a bolt, a single-flange wheel, a flat key, a sprocket and a transmission shaft. The sprocket and the transmission shaft are connected by a flat key, the single-flange wheel and the transmission shaft are connected by a flat key, the double-flange wheel and the transmission shaft are connected by a flat key, and both ends of the transmission shaft are locked with a shaft end plate by bolts. Each group of driven wheel seats is installed with two tapered roller bearings and two bushings. One group of driven wheel seats is installed with a single-flange wheel, and the other group is installed with a double-flange wheel.