Cab lifting device

Abstract

The utility model discloses a cab lifting device in the technical field of engineering vehicle cabs, which is characterized in that a pressing wheel is arranged on a frame and is mounted on the frame through a mounting bracket, and the pressing wheel is used for pressing a cab in the horizontal direction after the cab is lifted, so that pressing force in the horizontal direction is provided for the cab; the cab is supported in the horizontal direction, the stability of the cab in the horizontal direction is improved, meanwhile, gaps among parts of the lifting mechanism are eliminated, and therefore the effect of improving the stability of the cab is achieved, and shaking and vibration of the cab caused by vehicle movement, operation or other external force factors are weakened; and the riding comfort of a driver in a cab is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering vehicle cab technical field, concretely is a cab lifting device. BACKGROUND

[0002] Some engineering vehicles such as snow thrower need higher field of view when working, need to set up cab lifting mechanism, and the cab is lifted to the highest state when throwing snow.

[0003] And the load of snow thrower is changeable when throwing snow, which brings greater vibration to the snow thrower, especially when the speed is higher, the vibration of the vehicle due to driving is more obvious, (when using, there is high speed state of the transfer field and low speed state of the snow throwing operation, the high speed is about 45km / h, and the low speed is less than 15Km / h) ;

[0004] The commonly used lifting mechanism has scissor fork type, crank slider type and four connecting rod type, and no matter which lifting mechanism, the support of the cab in the horizontal direction is weaker than the support in the vertical direction, which leads to poor stability of the cab in the horizontal direction, especially after the cab is lifted, due to the lifting of the gravity center of the cab, and the lifting mechanism is in the unfolded state after the cab is lifted, which may cause the vibration and impact of the cab during the operation of the vehicle due to the road undulation, and affects the riding experience of the cab.

[0005] Based on this, the utility model designs a cab lifting device to solve the above problems. UTILITY MODEL CONTENTS

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme: a cab lifting device, comprising a vehicle frame, a cab and a lifting mechanism, further comprising a compression wheel for compressing the cab from the horizontal direction;The lifting mechanism is arranged on the vehicle frame, the cab is arranged at the top end of the lifting mechanism, and the height of the cab is adjusted by the lifting mechanism;The top end of the vehicle frame is fixedly provided with a mounting bracket, and the compression wheel is rotatably arranged on the mounting bracket, so that the compression wheel is compressed on the side surface of the cab after the cab is lifted.

[0007] As a further scheme of the utility model, one side of the cab towards the compression wheel is fixedly provided with a boss, and the boss is used for clamping between the cab and the compression wheel after the cab is lifted to the set height.

[0008] As a further scheme of the utility model, the top end of the boss is provided with a transition surface, and the transition surface is used for making the compression wheel smoothly transition from the surface of the cab to the surface of the boss.

[0009] As a further scheme of the present utility model, the support table is arranged on the vehicle frame and used for supporting the cab from the bottom of the cab when the cab is lowered to the lowest position.

[0010] As a further scheme of the present utility model, the lifting mechanism comprises a first fork, a second fork and a driving oil cylinder.

[0011] The first fork and the second fork are staggered with each other and the staggered positions are rotatably connected with each other through the rotating shafts, the distances from the rotating shafts to the bottom ends of the first fork and the second fork are equal, and the distances from the rotating shafts to the top ends of the first fork and the second fork are equal; the top end of the first fork is rotatably arranged at the bottom end of the cab, and the bottom end is slidably arranged at the top end of the vehicle frame; the top end of the second fork is slidably arranged at the bottom end of the cab, and the bottom end is rotatably arranged at the top end of the vehicle frame; the cylinder body and the piston of the driving oil cylinder are rotatably arranged on the first fork and the second fork respectively; the rotating shafts of the rotating connections between the cylinder body of the driving oil cylinder and the first fork, the rotating shafts of the rotating connections between the piston of the driving oil cylinder and the second fork, the rotating shafts of the rotating connections between the first fork and the cab, the rotating shafts of the rotating connections between the second fork and the vehicle frame and the rotating shafts of the rotating connections between the second fork and the second fork are parallel to each other.

[0012] As a further scheme of the present utility model, the bottom end of the first fork is rotatably provided with a first roller, and the first fork is in contact with the top end of the vehicle frame through the first roller; the top end of the second fork is rotatably provided with a second roller, and the second fork is in contact with the bottom end of the cab through the second roller; the top end of the vehicle frame and the bottom end of the cab are both provided with a limiting assembly for preventing the first roller from being separated from the top end of the vehicle frame and preventing the second roller from being separated from the bottom end of the cab.

[0013] As a further scheme of the present utility model, the limiting assembly comprises a first sliding shaft coaxially arranged with the first roller at the bottom end of the first fork, a second sliding shaft coaxially arranged with the second roller at the top end of the second fork, a first sliding slot and a second sliding slot; the top end of the vehicle frame is formed with the first sliding slot, and the bottom end of the cab is formed with the second sliding slot; the first sliding slot is parallel to the top surface of the vehicle frame, and the second sliding slot is parallel to the bottom surface of the cab; the first sliding shaft is slidably arranged in the first sliding slot, and the second sliding shaft is slidably arranged in the second sliding slot.

[0014] As a further scheme of the present utility model, the top end of the vehicle frame is provided with a first rolling way plate, and the bottom end of the cab is provided with a second rolling way plate; the first rolling way plate is used for contacting the first roller, and the second rolling way plate is used for contacting the second roller.

[0015] As a further scheme of the present utility model, the mounting bracket is fixedly provided with a mounting seat, the pressing wheel is rotatably arranged at the top end of the mounting seat, and the top end of the mounting seat is inclined to the direction close to the cab in the horizontal direction.

[0016] As a further scheme of the utility model, the first roller, the second roller and the compression wheel all comprise an outer ring, a middle ring, an inner ring and a bearing, the outer ring, the middle ring, the inner ring and the bearing are fixedly connected in sequence from outside to inside along the radial direction, and the middle ring is made of elastic material.

[0017] The utility model has the advantages of the following:

[0018] The utility model discloses a compression wheel is arranged on the frame, and the compression wheel is installed on the frame through the mounting bracket, is used for compressing the cab from the horizontal direction after the cab rises, provides the compression force in the horizontal direction for the cab, supports the cab from the horizontal direction, improves the stability of the cab in the horizontal direction, eliminates the gap between the parts of the lifting mechanism simultaneously, thereby reaches the effect of increasing the stability of the cab, thereby reduces the shaking and vibration of the cab caused by the movement of the vehicle, operation or other external factors, improves the riding comfort of the driver in the cab.

[0019] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated herein for purposes of explanation in connection with the detailed description of the application. In the drawings:

[0021] Figure 1 It is the overall structure schematic view of the utility model.

[0022] Figure 2 It is the I part enlarged schematic view of the utility model. Figure 1

[0023] Figure 3 It is the structure schematic view of the lifting mechanism in the utility model.

[0024] Figure 4 It is the overall structure side view schematic view in the utility model.

[0025] Figure 5 It is the cross section schematic view of the first roller, the second roller and the compression wheel in the utility model.

[0026] Legend:

[0027] ​1, lifting mechanism; 101, first fork; 102, drive oil cylinder; 103, second sliding shaft; 104, second roller; 105, second fork; 106, first roller; 107, first sliding shaft; 2, damping pad; 3, mounting bracket; 4, vehicle frame; 5, second runner plate; 6, second sliding groove; 7, first sliding groove; 8, first runner plate; 9, cab; 10, boss; 11, compression wheel; 1041, outer ring; 1042, middle ring; 1043, inner ring; 1044, bearing. DETAILED DESCRIPTION

[0028] The embodiments of the utility model are explained in detail below in combination with the drawings, but the utility model can be implemented in multiple different ways limited and covered by the following.

[0029] Please refer to Figures 1-5 The utility model provides a technical scheme: a cab lifting device, including vehicle frame 4, cab 9 and lifting mechanism 1, further including compression wheel 11 for compressing cab 9 from horizontal direction;

[0030] Lifting mechanism 1 is located on vehicle frame 4, cab 9 is located on the top end of lifting mechanism 1, and the height of cab 9 can be adjusted through lifting mechanism 1, so that the driver in cab 9 can obtain better vision in the operation stage, and the height of cab 9 can be lowered in the non-operation stage, so as to improve the stability and safety of cab 9, to facilitate the rapid movement of the vehicle;

[0031] Vehicle frame 4 top is fixedly provided with mounting bracket 3, and compression wheel 11 is rotatably arranged on mounting bracket 3, and compression wheel 11 is installed on vehicle frame 4 through mounting bracket 3, and compression wheel 11 and vehicle frame 4 have interval in vertical direction through mounting bracket 3, the height of mounting bracket 3 is designed according to the height of cab 9 and the lifting stroke of cab 9, so that compression wheel 11 installed on mounting bracket 3 can always compress cab 9 after cab 9 is lifted, and horizontal pressure is applied to cab 9, so as to compress cab 9 from horizontal direction, improve the stability of cab 9 in horizontal direction, effectively weaken the vibration of cab 9, and improve the riding comfort of the driver in cab 9;

[0032] By setting compression wheel 11 on vehicle frame 4, compression wheel 11 compresses cab 9 from horizontal direction, provides support force in horizontal direction for cab 9 after cab 9 is lifted, and eliminates the gap between the parts of lifting mechanism 1, so as to achieve the effect of increasing the stability of cab 9, weaken the shaking and vibration of cab 9 caused by vehicle movement, operation or other external factors, and improve the riding comfort of the driver in cab 9.

[0033] Further, as Figure 2As shown, the side of the cab 9 facing the compacting wheel 11 is fixedly provided with a boss 10, which is used to be clamped between the cab 9 and the compacting wheel 11 after the cab 9 is lifted to a certain height. When the cab 9 is lifted, the overall center of gravity of the vehicle frame 4 and the cab 9 will also be lifted, which will make the cab 9 unstable and prone to shaking. At the same time, when the cab 9 is lifted, the lifting mechanism 1 is in an unfolded state, and the contact area between the various parts of the lifting mechanism 1 is reduced, making the lifting mechanism 1 even more unstable. The boss 10 is fixedly provided on the side of the cab 9 that is used to contact the compacting wheel 11. When the cab 9 is lifted to a certain height, the compacting wheel 11 will roll from the side of the cab 9 to the boss 10. The boss 10 acts as a spacer to increase the distance between the compacting wheel 11 and the cab 9, thereby increasing the compacting force of the compacting wheel 11 on the cab 9. After the cab 9 is lifted to a certain height, the compacting force of the compacting wheel 11 on the cab 9 can be further increased, further improving the stability of the cab 9 after it is lifted.

[0034] Alternatively, before the boss 10 is clamped between the compacting wheel 11 and the cab 9, the compacting wheel 11 does not contact the cab 9. Only after the cab 9 is lifted to a certain height and the boss 10 is clamped between the compacting wheel 11 and the cab 9, the compacting wheel 11 will apply a horizontal compacting force to the cab 9 through the boss 10.

[0035] Further, as shown in Figure 2 The top end of the boss 10 is provided with a transition surface, which is used to smoothly transition the compacting wheel 11 from the surface of the cab 9 to the surface of the boss 10. When the compacting wheel 11 rolls from the side of the cab 9 to the side of the boss 10, there will be a height difference. By providing a transition surface, the compacting wheel 11 can be smoothly rolled from the side of the cab 9 to the side of the boss 10, and the compacting force of the compacting wheel 11 on the cab 9 can be gradually increased as the cab 9 is lifted, so that the compacting wheel 11 is more stable when it rolls from the side of the cab 9 to the side of the boss 10 or from the side of the boss 10 to the side of the cab 9.

[0036] Figure 2 An example of a transition surface is shown. In this example, the top end of the boss 10 is provided with an inclined surface, the top end of the inclined surface is close to the cab 9, and the bottom end of the inclined surface is close to the side of the boss 10 that is used to contact the compacting wheel 11. The inclined surface guides the compacting wheel 11 from the side of the cab 9 to the side of the boss 10, thereby achieving the effect of smooth transition of the compacting wheel 11 between the side of the boss 10 and the side of the cab 9.

[0037] Further, as shown in Figure 1As shown, the frame 4 is provided with a support table for supporting the cab 9 from the bottom of the cab 9 when the cab 9 is lowered to the lowest position, and the cab is supported by the support table and the lifting mechanism 1 to improve the stability of the cab 9. The side of the support table in contact with the cab 9 is provided with a damping pad 2. When the cab 9 is lowered to the lowest position, the bottom end of the cab 9 is pressed against the damping pad 2, and the vibration conducted from the frame 4 to the cab 9 is weakened by the damping pad 2, thereby reducing the vibration of the cab 9 and improving the ride comfort of the cab 9.

[0038] Further, as shown in the drawings, Figure 3 The lifting mechanism 1 includes a first fork 101, a second fork 105, and a drive oil cylinder 102. The first fork 101 and the second fork 105 are staggered with each other and are rotatably connected by a rotating shaft. The distance from the rotating shaft to the bottom end of the first fork 101 and the distance from the rotating shaft to the bottom end of the second fork 105 are equal. The distance from the rotating shaft to the top end of the first fork 101 and the distance from the rotating shaft to the top end of the second fork 105 are equal. The top end of the first fork 101 is rotatably arranged at the bottom end of the cab 9, and the bottom end is slidably arranged at the top end of the frame 4. The top end of the second fork 105 is slidably arranged at the bottom end of the cab 9, and the bottom end is rotatably arranged at the top end of the frame 4. The cylinder and the piston of the drive oil cylinder 102 are rotatably arranged on the first fork 101 and the second fork 105, respectively. The rotating shafts of the cylinder of the drive oil cylinder 102 and the first fork 101, the rotating shafts of the piston of the drive oil cylinder 102 and the second fork 105, the rotating shafts of the first fork 101 and the cab 9, the rotating shafts of the second fork 105 and the frame 4, and the rotating shafts of the second fork 105 and the second fork 105 are parallel to each other.

[0039] When the piston of the drive oil cylinder 102 extends, the bottom end of the first fork 101 and the bottom end of the second fork 105 approach each other. At this time, the first fork 101 and the second fork 105 tend to be vertical, and the height of the first fork 101 and the second fork 105 in the vertical direction increases, thereby achieving the effect of lifting the cab 9. Conversely, when the piston of the drive oil cylinder 102 is retracted into the cylinder, the bottom end of the first fork 101 and the bottom end of the second fork 105 move away from each other. At this time, the first fork 101 and the second fork 105 tend to be horizontal, and the height of the first fork 101 and the second fork 105 in the vertical direction decreases, thereby achieving the effect of lowering the cab 9. The action of the first fork 101 and the second fork 105 is realized by the drive of the drive oil cylinder 102, so that the height of the first fork 101 and the second fork 105 in the vertical direction changes, thereby achieving the effect of adjusting the height of the cab 9.

[0040] Further, as shown in the drawings, Figure 3As shown, the bottom end of the first fork 101 is rotationally provided with a first roller 106, and the first fork 101 is in contact with the top end of the frame 4 through the first roller 106; the top end of the second fork 105 is rotationally provided with a second roller 104, and the second fork 105 is in contact with the bottom end of the cab 9 through the second roller 104; through the contact between the first roller 106 and the top end of the frame 4, the sliding fit between the first fork 101 and the frame 4 is changed into a rolling fit, and similarly, through the contact between the second roller 104 and the bottom end of the cab 9, the sliding fit between the second fork 105 and the cab 9 is changed into a rolling fit, the sliding friction is changed into rolling friction, the abrasion between the contact position of the first fork 101 and the frame 4 is reduced, the abrasion between the contact position of the second fork 105 and the cab 9 is reduced, and the rolling friction is more stable than the sliding friction, so that the cab 9 will not be stuck when being raised or lowered;

[0041] The top end of the frame 4 and the bottom end of the cab 9 are both provided with a limiting assembly, which is used to prevent the first roller 106 from being separated from the top end of the frame 4 and prevent the second roller 104 from being separated from the bottom end of the cab 9, so as to prevent the lifting mechanism 1 or the cab 9 from tilting and ensure the safety of the cab 9.

[0042] Specifically, as shown in the figure, Figure 4 The limiting assembly includes a first sliding shaft 107 coaxially arranged at the bottom end of the first fork 101 and the first roller 106, a second sliding shaft 103 coaxially arranged at the top end of the second fork 105 and the second roller 104, and a sliding groove, the top end of the frame 4 is formed with a first sliding groove 7, and the bottom end of the cab 9 is formed with a second sliding groove 6, the first sliding groove 7 is parallel to the top surface of the frame 4, the second sliding groove 6 is parallel to the bottom surface of the cab 9, the first sliding shaft 107 is slidingly arranged in the first sliding groove 7, and the second sliding shaft 103 is slidingly arranged in the second sliding groove 6, so that the first sliding shaft 107 can only slide along the first sliding groove 7 on the frame 4, and the second sliding shaft 103 can only slide along the second sliding groove 6 at the bottom end of the cab 9, the first sliding groove 7 is parallel to the top surface of the frame 4, so that the distance between the first sliding shaft 107 and the top surface of the frame 4 can be always equal when the first sliding shaft 107 slides in the first sliding groove 7, the second sliding groove 6 is parallel to the bottom surface of the cab 9, so that the distance between the second sliding shaft 103 and the bottom surface of the cab 9 can be always equal when the second sliding shaft 103 slides in the second sliding groove 6, thereby achieving the effect of limiting the first roller 106 and the second roller 104, preventing the first roller 106 from being separated from the top end of the frame 4, preventing the second roller 104 from being separated from the bottom end of the cab 9, and preventing the lifting mechanism 1 or the cab 9 from tilting and overturning;

[0043] As shown in the figure, Figure 4As shown, the bottom end of the cab 9 and the top end of the frame 4 are fixedly provided with L-shaped clamping blocks, the L-shaped clamping blocks and the top surface of the frame 4 form a first sliding groove 7, the L-shaped clamping blocks and the bottom surface of the cab 9 form a second sliding groove 6, the height of the first sliding groove 7 and the second sliding groove 6 respectively matches the diameter of the first sliding shaft 107 and the second sliding shaft 103, for limiting the vertical movement of the first sliding shaft 107 and the second sliding shaft 103 respectively, so as to achieve the effect of limiting the first roller 106 and the second roller 104.

[0044] In the embodiment, the top end of the frame 4 is provided with the first rolling way plate 8, and the bottom end of the cab 9 is provided with the second rolling way plate 5, the first rolling way plate 8 is used for contacting the first roller 106, and the second rolling way plate 5 is used for contacting the second roller 104.

[0045] Through the contact of the first rolling way plate 8 and the second rolling way plate 5 with the first roller 106 and the second roller 104 respectively, the first rolling way plate 8 and the second rolling way plate 5 can be replaced after wearing, so as to avoid the surface wear of the frame 4 and the cab 9.

[0046] Preferably, as shown in the drawings, Figure 5 As shown, the first roller 106, the second roller 104 and the compression wheel 11 all include an outer ring 1041, a middle ring 1042, an inner ring 1043 and a bearing 1044, which are fixedly connected in sequence from outside to inside along the radial direction, and the middle ring 1042 is made of elastic material.

[0047] The middle ring 1042 in the first roller 106, the second roller 104 and the compression wheel 11 is made of elastic material, so that the first roller 106, the second roller 104 and the compression wheel 11 can all achieve the effect of weakening vibration transmission, weaken the vibration of the frame 4 conducted to the cab 9 by the first fork 101, the second fork 105 and the compression wheel 11, so as to achieve the effect of weakening the vibration of the cab 9, and further improve the riding comfort of the cab 9.

[0048] Specifically, the mounting bracket 3 is fixedly provided with a mounting seat, the compression wheel 11 is rotatably arranged at the top end of the mounting seat, and the top end of the mounting seat is inclined in the horizontal direction to the direction close to the cab 9, so that the compression wheel 11 is closer to the cab 9 in the horizontal direction, so that when the compression wheel 11 is pressed against the side of the cab 9, the mounting bracket 3 will not contact the cab 9 and the boss 10.

[0049] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cab lifting device comprising a frame (4), a cab (9) and a lifting mechanism (1), characterized in that: Further comprising a compression wheel (11) for compressing the cab (9) from the horizontal direction; The lifting mechanism (1) is arranged on the frame (4), and the cab (9) is arranged at the top end of the lifting mechanism (1), and the height of the cab (9) is adjusted through the lifting mechanism (1); The top end of the frame (4) is fixedly provided with a mounting bracket (3), and the compression wheel (11) is rotatably arranged on the mounting bracket (3), so that the compression wheel (11) is compressed on the side of the cab (9) after the cab (9) is lifted up.

2. A cab lifting device according to claim 1, characterised in that: One side of the cab (9) facing the compression wheel (11) is fixedly provided with a boss (10), which is used for being clamped between the cab (9) and the compression wheel (11) after the cab (9) is lifted to a set height.

3. A cab lifting device according to claim 2, characterised in that: The top end of the boss (10) is provided with a transition surface, which is used for smoothly transitioning the compression wheel (11) from the surface of the cab (9) to the surface of the boss (10).

4. A cab lifting device according to claim 1, characterised in that: The frame (4) is provided with a support table for supporting the cab (9) from the bottom of the cab (9) when the cab (9) is lowered to the lowest position, and one side of the support table used for contacting the cab (9) is provided with a damping pad (2).

5. A cab lifting device according to claim 1, characterized in that: The lifting mechanism (1) comprises a first fork (101), a second fork (105) and a driving oil cylinder (102); The first fork (101) and the second fork (105) are staggered with each other and are rotatably connected to each other at the staggered positions, the distance from the rotating shaft to the bottom end of the first fork (101) and the bottom end of the second fork (105) is equal, and the distance from the rotating shaft to the top end of the first fork (101) and the top end of the second fork (105) is equal; The top end of the first fork (101) is rotatably arranged at the bottom end of the cab (9), and the bottom end is slidably arranged at the top end of the frame (4); The top end of the second fork (105) is slidably arranged at the bottom end of the cab (9), and the bottom end is rotatably arranged at the top end of the frame (4); The cylinder and the piston of the driving oil cylinder (102) are rotatably arranged on the first fork (101) and the second fork (105) respectively; The rotating shafts of the rotating connections between the cylinder of the driving oil cylinder (102) and the first fork (101), the rotating shafts of the rotating connections between the piston of the driving oil cylinder (102) and the second fork (105), the rotating shafts of the rotating connections between the first fork (101) and the cab (9), the rotating shafts of the rotating connections between the second fork (105) and the frame (4), and the rotating shafts of the rotating connections between the second fork (105) and the second fork (105) are parallel to each other.

6. The cab lifting device according to claim 5, wherein: The bottom end of the first fork (101) is rotatably provided with a first roller (106), and the first fork (101) is in contact with the top end of the frame (4) through the first roller (106); The top end of the second fork (105) is rotatably provided with a second roller (104), and the second fork (105) is in contact with the bottom end of the cab (9) through the second roller (104); The top end of the frame (4) and the bottom end of the cab (9) are provided with limiting assemblies for preventing the first roller (106) from being separated from the top end of the frame (4) and the second roller (104) from being separated from the bottom end of the cab (9).

7. A cab lifting device according to claim 6, characterised in that: The limiting assembly comprises a first sliding shaft (107) coaxially arranged at the bottom end of the first fork (101) and the first roller (106), a second sliding shaft (103) coaxially arranged at the top end of the second fork (105) and the second roller (104), a first sliding groove (7) formed at the top end of the frame (4), and a second sliding groove (6) formed at the bottom end of the cab (9), the first sliding groove (7) is parallel to the top surface of the frame (4), the second sliding groove (6) is parallel to the bottom surface of the cab (9), the first sliding shaft (107) is slidingly arranged in the first sliding groove (7), and the second sliding shaft (103) is slidingly arranged in the second sliding groove (6).

8. A cab lifting device according to claim 6, characterised in that: The top end of the frame (4) is provided with a first rolling way plate (8), and the bottom end of the cab (9) is provided with a second rolling way plate (5), the first rolling way plate (8) is used for contacting the first roller (106), and the second rolling way plate (5) is used for contacting the second roller (104).

9. A cab riser assembly as in claim 1, wherein: The mounting bracket (3) is fixedly provided with a mounting seat, the pressing wheel (11) is rotatably arranged at the top end of the mounting seat, and the top end of the mounting seat is inclined to the cab (9) in the horizontal direction.

10. A cab riser assembly as in claim 6, wherein: The first roller (106), the second roller (104) and the pressing wheel (11) all comprise an outer ring (1041), a middle ring (1042), an inner ring (1043) and a bearing (1044), which are sequentially and fixedly connected from outside to inside in the radial direction, and the middle ring (1042) is made of elastic material.

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