An engineering vehicle and chassis therefor

Abstract

This utility model discloses an engineering vehicle and its chassis, including a chassis body, a winch, and a winch support. The winch is installed on the rear side of the chassis body in the forward direction, allowing the winch performing traction work behind the chassis body and the working device performing construction work in front of the chassis body to operate independently or collaboratively without interference, thus improving equipment utilization and work efficiency. The winch support is installed on the chassis body located behind the winch, and the winch support has a rope guiding structure to limit the rope released from the winch. This utility model enables convenient collection of logs while meeting load-bearing requirements.

Description

Technical Field

[0001] This utility model relates to an engineering vehicle chassis, specifically an excavator chassis used for collecting scattered logs in forest areas, belonging to the field of forestry machinery technology. Background Technology

[0002] With the development of mechanization in forestry operations, log grabbers, modified from traditional excavators, have been successfully applied to tasks such as log grabbing, stacking, clearing logging waste, and loading / unloading in forest farms, significantly improving operational efficiency. However, due to the rugged and steep terrain, close spacing between trees, and limited operating space of log grabbers, the key to improving operational efficiency lies in how to conveniently collect fallen trees scattered throughout the forest.

[0003] Since log grabbers cannot move freely within the forest, a flexible unit with strong mobility and unaffected by forestry terrain is needed to move the logs to a location that allows the log grabber to operate within its working space. Dragging the logs using a winch with retracted ropes is a key method. Therefore, the chassis of a traditional excavator needs to be modified to accommodate the winch installation.

[0004] In addition, ropes require protection and guidance in practical applications. A rope guide structure is a mechanical component used to guide, constrain, and stabilize rope movement, preventing excessive swinging, tangling, derailment, and wear during deployment and retraction, which could lead to rope failure. Finally, when dragging logs, the rope guide structure must also meet certain load-bearing requirements.

[0005] Patent 1 (CN211285743U) discloses an excavator with a winch function. A winch is installed on the slewing platform and a guide component is installed on the right side of the boom. The purpose is to enable the excavator to have a winch function, which facilitates the transfer of trees felled on hills or slopes.

[0006] Patent 2 (CN221397033U) discloses a hoisting device for an excavator and an excavator. A winch is installed on the upper surface near the boom hinge, and guide components are installed on the upper surface in the middle of the boom and the upper surface at the stick hinge. The purpose is to enable the excavator to have a hoisting function, thereby improving the utilization rate of the equipment and construction efficiency, and reducing construction costs.

[0007] However, both Patent 1 and Patent 2 have the following shortcomings:

[0008] (1) The operation of the hoist and the operation of the working device are mutually restrictive and cannot operate independently and efficiently;

[0009] (2) The lifting function at the front cannot meet the towing needs of the rear during movement;

[0010] (3) The cantilever load transfer causes severe shaking of the whole machine, resulting in insufficient stability under heavy load and complex terrain. Summary of the Invention

[0011] To address the problems existing in the prior art, this utility model provides an engineering vehicle chassis with a rope guiding mechanism and a winch installation capability, enabling convenient collection of logs and meeting load-bearing requirements.

[0012] This utility model is achieved according to the following technical solution:

[0013] In a first aspect, this utility model provides an engineering vehicle chassis, comprising:

[0014] Chassis body;

[0015] The winch is installed on the rear side of the chassis body in the forward direction, so that the winch that performs traction work behind the chassis body and the working device that performs construction work in front of the chassis body can operate independently or work together in parallel.

[0016] A winch support is installed on the chassis body located behind the winch. The winch support has a rope guiding structure to limit the rope released from the winch.

[0017] In some embodiments, the rear central region of the chassis body is configured as a concave structure for mounting the winch.

[0018] In some embodiments, the concave structure is implemented in the following manner:

[0019] Two box-shaped structures arranged opposite each other in the horizontal direction are provided in the protruding area of ​​the bottom plate of the chassis body, and a hoist mounting plate is fixed on the bottom plate between the two box-shaped structures.

[0020] In some embodiments, the box-shaped structure consists of an outer protective plate and an inner protective plate welded between the bottom plate and the upright plate of the chassis body, and a single-sided curved plate welded to the top surface of the inner and outer protective plates.

[0021] In some embodiments, both the outer and inner protective plates are higher than the top plate of the chassis body, and both the outer and inner protective plates have grooves with openings facing the top plate and a height slightly greater than the thickness of the top plate; the outer edge of the top plate of the chassis body passes into the grooves of the inner and outer protective plates, and the end of the groove is provided with a semi-circular arc stress relief groove; the opening between the single-sided curved plate and the top plate is sealed by a welded sealing plate, thereby forming a closed box-shaped structure.

[0022] In some embodiments, the top surface and / or side surface of the single-sided curved plate are fixed with a mounting plate that provides a mounting plane and holes for installing the hoist bracket; and / or,

[0023] An outer stiffening plate is welded to the connection between the top plate and the outer protective plate of the chassis body, and the outer stiffening plate intersects the vertical plate of the chassis body directly below it in the vertical direction; and / or,

[0024] The inner side stiffener is welded at the connection between the inner and outer protective plates of the top plate of the chassis body, and the inner side stiffener partially overlaps with the vertical plate of the chassis body directly below it in the vertical direction.

[0025] In some embodiments, the hoist support further includes:

[0026] The upper double-bent plate, the lower double-bent plate, and the outer vertical plate are welded together to form a C-shaped mounting frame for the winch bracket. The two ends of the C-shaped mounting frame are assembled on the chassis body.

[0027] Two horizontally oriented wooden hooks are fixed to the protruding area in the middle of the C-shaped mounting frame; the rope guide structure is fixed to the protruding area in the middle of the C-shaped mounting frame between the two wooden hooks.

[0028] In some embodiments, a U-shaped mounting plate is fixed to both ends of the C-shaped mounting frame, and is fixed to a single-sided curved plate on the chassis body by bolts.

[0029] In some embodiments, at least one stiffening rib is welded between the U-shaped mounting plate and the C-shaped mounting frame; and / or,

[0030] At least one inner vertical plate is welded between the lower double-bent plates.

[0031] In some embodiments, the rope guiding structure includes:

[0032] Two upper vertical panels arranged opposite each other in the horizontal direction;

[0033] Two roller assemblies arranged vertically opposite each other are rotatably supported on two upper side plates at positions away from the winch. The gap between the two roller assemblies is sufficient for the rope to pass through, and the rope is limited at the top and bottom.

[0034] Two horizontally oriented roller assemblies are installed on two upper vertical plates near the winch. The gap between the two roller assemblies is sufficient for the rope to pass through, thus limiting the rope's movement to the left and right.

[0035] In some embodiments, the roller assembly includes:

[0036] The upper and lower ear plates are respectively installed on the upper and lower ends of the upper upright plate; the upper and lower ear plates are provided with coaxial mounting holes;

[0037] A vertical shaft is inserted vertically into the mounting holes of the upper and lower side ear plates, and the vertical shaft is limited in axial movement and circumferential rotation by a limiting component;

[0038] A vertical shaft sleeve is fitted onto a vertical shaft located between the upper and lower side lugs, and the vertical shaft sleeve is capable of circumferential rotation on the vertical shaft.

[0039] In some embodiments, both the upper and lower ear plates have grooves, and the outer edge of the upper upright plate passes through the grooves of the upper and lower ear plates and is then welded together; and / or,

[0040] The limiting assembly includes a vertical shaft limiting block and bolts. The vertical shaft protrudes from the outer circumference of the upper ear plate and has a groove. The front part of the vertical shaft limiting block is inserted into the groove, and the rear part of the vertical shaft limiting block is fixed to the upper ear plate by bolts.

[0041] In some embodiments, the roller assembly includes:

[0042] A T-shaped horizontal shaft is inserted between two upper vertical plates; the small end of the horizontal shaft is provided with an external thread, and the axial movement of the horizontal shaft is limited by tightening the nut; the large end of the horizontal shaft is provided with a notch, and the horizontal shaft limiting block is welded to the upper vertical plate at the notch to limit the circumferential rotation of the horizontal shaft.

[0043] The bearing is fitted onto the horizontal shaft and is limited by the horizontal shaft sleeve;

[0044] A pulley is mounted on the bearing, and a groove is provided in the middle of the outer circumference of the pulley. The rope passes through the groove of the pulley arranged above and below.

[0045] Secondly, this utility model provides an engineering vehicle, including the aforementioned engineering vehicle chassis.

[0046] The beneficial effects of this utility model are:

[0047] (1) It realizes the physical separation of winch traction operation and working device operation, so that the two can be operated independently or in coordination without interfering with each other, thereby improving equipment utilization and operation efficiency.

[0048] (2) The winch is arranged at the rear of the chassis so that the dragging operation is concentrated at the rear of the machine, so that the log grabber can smoothly carry out the rear dragging operation while moving forward or doing other front-end operations, such as clearing obstacles, which improves the efficiency and mobility when operating in complex forestry environments.

[0049] (3) The working load acts directly on the main structure of the chassis, which reduces the stress load on the working device, the slewing platform and related hinge points, suppresses the shaking of the whole machine when the winch is working, and improves the operational stability and structural reliability. Attached Figure Description

[0050] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0051] In the attached diagram:

[0052] Figure 1 This is a structural diagram of the engineering vehicle chassis of this utility model;

[0053] Figure 2 This is a structural diagram of the chassis body of this utility model;

[0054] Figure 3 This is a front structural view of the winch support of this utility model;

[0055] Figure 4 This is a reverse structural diagram of the winch support of this utility model;

[0056] Figure 5 This is a schematic diagram of the rope guiding structure of this utility model;

[0057] Figure 6 This is a structural diagram of the roller assembly of this utility model.

[0058] Attached diagram labels: Chassis body 1, Base plate 1-1, Right side mounting plate 1-2, Outer side guard plate 1-3, Single-bend plate 1-4, Outer side stiffening plate 1-5, Lower side mounting plate 1-6, Sealing plate 1-7, Inner side stiffening plate 1-8, Inner side guard plate 1-9, Winch mounting plate 1-10; Winch 2; Winch bracket 3, Wooden hook 3-1, Outer side upright plate 3-2, Upper double-bend plate 3-3, Front side mounting plate 3 -4, stiffening plate 3-5, upper mounting plate 3-6, lower double-bent plate 3-7, inner upright plate 3-8, upper upright plate 3-9, horizontal axis limiting block 3-10, long stiffening plate 3-11, lower ear plate 3-12, vertical shaft sleeve 3-13, vertical shaft limiting block 3-14, vertical shaft 3-15, upper ear plate 3-16, pulley 3-17, bearing 3-18, horizontal shaft sleeve 3-19, horizontal shaft 3-20.

[0059] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0061] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0062] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0063] like Figure 1 As shown, an engineering vehicle chassis includes three main parts: a chassis body 1, a winch 2, and a winch support 3. The winch 2 is installed on the rear side of the chassis body 1 in the forward direction, so that the winch 2, which performs traction operations behind the chassis body 1, and the working device, which performs construction operations in front of the chassis body 1, can operate independently or in coordination. The winch support 3 is installed on the chassis body 1 located behind the winch 2, and the winch support 3 has a rope guiding structure to limit the rope released from the winch 2.

[0064] The following provides a further explanation of the specific structure of the aforementioned chassis body.

[0065] like Figure 2As shown, the base plate 1-1 is fixed to the lower side of the entire structure, providing an installation platform for other plates and the winch 2. Semi-circular stress relief grooves are cut on both sides to reduce the stress value at this location under extreme working conditions, thus reducing the risk of cracking in the welded area. The right outer protective plate 1-3, single-bent plate 1-4, sealing plate 1-7, and inner protective plate 1-9 contact the surface of the base plate 1-1 and are fixed above it. The outer protective plate 1-3 and inner protective plate 1-9 have grooves slightly larger than the thickness of the top plate of the chassis body 1. During fixing, the outer edge of the top plate of the chassis body 1 is inserted into the grooves for reinforcement. The ends of the grooves have semi-circular stress relief grooves to reduce the stress value at this location and avoid the risk of cracking. A certain distance is left between the two protective plates, forming a closed box structure with the base plate 1-1 after fixing, enhancing the structural load-bearing stability. The right mounting plate 1-2 and the lower mounting plate 1-6 are respectively fixed to the surface of the single-bent plate 1-4 through holes, providing an installation plane and holes for the winch bracket installation. Outer stiffeners 1-5 and inner stiffeners 1-8 are installed on both sides of the closed box-shaped structure. The outer stiffeners 1-5 intersect with the vertical plate directly below in the vertical direction, while the inner stiffeners 1-8 partially overlap with the vertical plate directly below in the vertical direction to enhance the lateral load-bearing capacity and improve the structural stress rationality. The right and left structures are symmetrically arranged. After the hoist mounting plate 1-10 is fixed above the base plate 1-1 through the alignment of the mounting holes, the structural formation of the chassis 1 is completed.

[0066] The following provides a further explanation of the specific structure of the aforementioned hoist support.

[0067] like Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the overall structure is symmetrical from left to right. It is bolted to the base plate 1-1 via the front mounting plate 3-4 and the upper mounting plate 3-6. After fixing the front mounting plate 3-4 to the upper double-bent plate 3-3, the upper mounting plate 3-6 is then fixed to the front mounting plate 3-4. Next, the outer upright plate 3-2, the lower double-bent plate 3-7, the inner upright plate 3-8, and the timber hook 3-1 are fixed in sequence to complete the overall frame. The stiffening plate 3-5 is then fixed. This stiffening plate 3-5 is the main load-bearing component when the winch 2 and the timber hook 3-1 are dragging; therefore, it is necessary to ensure good contact between this stiffening plate and the front mounting plate 3-4, the upper mounting plate 3-6, and the upper double-bent plate 3-3. A shallow groove is provided at the fixing point of the upper upright plate 3-9 to accommodate the protrusion of the outer upright plate 3-2 relative to the upper surface of the upper double-bent plate 3-3. The front section of the horizontal shaft 3-20 has a through hole for installation. The small end of the horizontal shaft 3-20 has an external thread, and the axial movement of the horizontal shaft 3-20 is limited by tightening the nut. The large end of the horizontal shaft 3-20 has a notch, and the horizontal shaft limiting block 3-10 is welded to the upper upright plate 3-9 at the notch to limit the circumferential rotation of the horizontal shaft 3-20. Two bearings 3-18 are installed on the horizontal shaft 3-20. Three horizontal shaft sleeves 3-19 are installed between the bearings 3-18 and between the bearings 3-18 and the two upper upright plates 3-9 to limit the left and right movement of the bearings 3-18. The bearings 3-18 are equipped with pulleys 3-17 with a groove in the middle to prevent the rope from derailing during operation, stabilize the position of the rope outlet, and prevent the rope from contacting other parts and causing rope wear. A long stiffener plate 3-11 is welded between the upper upright plate 3-9 and the upper double-bent plate 3-3; the lower ear plate 3-12 and the upper ear plate 3-16 are fixed to the rear end of the upper upright plate 3-9. A vertical shaft 3-15 and a vertical shaft sleeve 3-13 are installed between the two ear plates. A slot is opened at the end of the vertical shaft 3-15. After the vertical shaft 3-15 is assembled into the correct position, the vertical shaft limiting block 3-14 is inserted into the slot of the vertical shaft 3-15 and then fixed to the upper ear plate 3-16 with bolts, thus completing the vertical and rotational limiting of the vertical shaft 3-15.

[0068] The actual application structure is located at the rear of the vehicle. The winch bracket 3 is fixed to the chassis body 1 with bolts, and the winch 2 is fixed to the base plate 1-1 and the winch mounting plate 1-10 with bolts. The rope is released from the winch 2 and passes between two vertical shaft sleeves 3-13 and two pulleys 3-17. The vertical shaft sleeves 3-13 and pulleys 3-17 are in contact with the rope surface and rotate with the winding and unwinding, respectively serving as left and right limiters and up and down limiters. The pulleys 3-17 have a groove in the middle to prevent the rope from derailing during winding and unwinding, stabilize the rope outlet position, and prevent the rope from contacting other parts and causing rope wear. When the loose logs are dragged by the winch and piled up next to the log grabber, the log hook 3-1 is used and the log grabber is moved to complete the log collection operation.

[0069] In summary, this utility model provides an engineering vehicle chassis that achieves the following functions and effects:

[0070] (1) It realizes the physical separation of winch traction operation and working device operation, so that the two can be operated independently or in coordination without interfering with each other, thereby improving equipment utilization and operation efficiency.

[0071] (2) The winch is arranged at the rear of the chassis so that the dragging operation is concentrated at the rear of the machine, so that the log grabber can smoothly carry out the rear dragging operation while moving forward or doing other front-end operations, such as clearing obstacles, which improves the efficiency and mobility when operating in complex forestry environments.

[0072] (3) The working load acts directly on the main structure of the chassis, which reduces the stress load on the working device, the slewing platform and related hinge points, suppresses the shaking of the whole machine when the winch is working, and improves the operational stability and structural reliability.

[0073] The following describes the engineering machinery provided by this utility model. The engineering machinery described below can be referred to in correspondence with the engineering vehicle chassis described above.

[0074] The engineering machinery provided by this utility model may include the engineering vehicle chassis as described in any of the above embodiments.

[0075] The beneficial effects achieved by the engineering machinery provided by this utility model are consistent with the beneficial effects achieved by the engineering vehicle chassis provided by this utility model, so they will not be repeated here.

[0076] It should be noted that the aforementioned construction machinery can be tracked excavators.

[0077] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0078] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0079] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An engineering vehicle chassis characterized by, include: Chassis body; The winch is installed on the rear side of the chassis body in the forward direction, so that the winch that performs traction work behind the chassis body and the working device that performs construction work in front of the chassis body can operate independently or work together in parallel. A winch support is installed on the chassis body located behind the winch. The winch support has a rope guiding structure to limit the rope released from the winch.

2. The engineering vehicle chassis according to claim 1, characterized in that: The rear central area of ​​the chassis body is designed as a concave structure for mounting the winch.

3. An engineering vehicle chassis according to claim 2, wherein, The concave structure is achieved in the following way: Two box-shaped structures arranged opposite each other in the horizontal direction are provided in the protruding area of ​​the bottom plate of the chassis body, and a hoist mounting plate is fixed on the bottom plate between the two box-shaped structures.

4. The engineering vehicle chassis according to claim 3, characterized in that: The box-shaped structure consists of an outer protective plate and an inner protective plate welded between the bottom plate and the vertical plate of the chassis body, as well as a single-sided curved plate welded to the top surface of the inner and outer protective plates.

5. The engineering vehicle chassis according to claim 4, characterized in that: Both the outer and inner protective plates are higher than the top plate of the chassis body, and both the outer and inner protective plates have grooves with openings facing the top plate and a height slightly greater than the thickness of the top plate. The outer edge of the top plate of the chassis body passes into the grooves of the inner and outer protective plates, and the end of the groove is provided with a semi-circular arc stress relief groove. The opening between the single-sided curved plate and the top plate is sealed by a welded sealing plate, thereby forming a closed box-shaped structure.

6. The engineering vehicle chassis according to claim 4, characterized in that: The top surface and / or side surface of the single-sided curved plate are fixed with a mounting plate that provides a mounting plane and holes for the hoist bracket installation; and / or, An outer stiffening plate is welded to the connection between the top plate and the outer protective plate of the chassis body, and the outer stiffening plate intersects the vertical plate of the chassis body directly below it in the vertical direction; and / or, The inner side stiffener is welded at the connection between the inner and outer protective plates of the top plate of the chassis body, and the inner side stiffener partially overlaps with the vertical plate of the chassis body directly below it in the vertical direction.

7. An off-highway vehicle chassis as claimed in claim 1, wherein, The hoist support also includes: The upper double-bent plate, the lower double-bent plate, and the outer vertical plate are welded together to form a C-shaped mounting frame for the winch bracket. The two ends of the C-shaped mounting frame are assembled on the chassis body. Two horizontally oriented wooden hooks are fixed to the protruding area in the middle of the C-shaped mounting frame; the rope guide structure is fixed to the protruding area in the middle of the C-shaped mounting frame between the two wooden hooks.

8. The engineering vehicle chassis according to claim 7, characterized in that: Both ends of the C-shaped mounting frame are fixed with a ┌-shaped mounting plate, which is fixed to a single-sided curved plate on the chassis body by bolts.

9. The engineering vehicle chassis according to claim 8, characterized in that: At least one stiffening plate is welded between the ┌-shaped mounting plate and the C-shaped mounting frame; and / or, At least one inner vertical plate is welded between the lower double-bent plates.

10. An engineered vehicle chassis as in claim 1, wherein, The rope guiding structure includes: Two upper vertical panels arranged opposite each other in the horizontal direction; Two roller assemblies arranged vertically opposite each other are rotatably supported on two upper side plates at positions away from the winch. The gap between the two roller assemblies is sufficient for the rope to pass through, and the rope is limited at the top and bottom. Two horizontally oriented roller assemblies are installed on two upper vertical plates near the winch. The gap between the two roller assemblies is sufficient for the rope to pass through, thus limiting the rope's movement to the left and right.

11. The engineering vehicle chassis according to claim 10, characterized in that, The roller assembly includes: The upper and lower ear plates are respectively installed on the upper and lower ends of the upper upright plate; the upper and lower ear plates are provided with coaxial mounting holes; A vertical shaft is inserted vertically into the mounting holes of the upper and lower side ear plates, and the vertical shaft is limited in axial movement and circumferential rotation by a limiting component; A vertical shaft sleeve is fitted onto a vertical shaft located between the upper and lower side lugs, and the vertical shaft sleeve is capable of circumferential rotation on the vertical shaft.

12. The engineering vehicle chassis according to claim 11, characterized in that: Both the upper and lower ear plates have grooves, and the outer edge of the upper upright plate passes through the grooves of the upper and lower ear plates and is then welded together; and / or, The limiting assembly includes a vertical shaft limiting block and bolts. The vertical shaft protrudes from the outer circumference of the upper ear plate and has a groove. The front part of the vertical shaft limiting block is inserted into the groove, and the rear part of the vertical shaft limiting block is fixed to the upper ear plate by bolts.

13. The engineering vehicle chassis according to claim 10, characterized in that, The roller assembly includes: A T-shaped horizontal shaft is inserted between two upper vertical plates; the small end of the horizontal shaft is provided with an external thread, and the axial movement of the horizontal shaft is limited by tightening the nut; the large end of the horizontal shaft is provided with a notch, and the horizontal shaft limiting block is welded to the upper vertical plate at the notch to limit the circumferential rotation of the horizontal shaft. The bearing is fitted onto the horizontal shaft and is limited by the horizontal shaft sleeve; A pulley is mounted on the bearing, and a groove is provided in the middle of the outer circumference of the pulley. The rope passes through the groove of the pulley arranged above and below.

14. An engineering vehicle, characterized in that: Includes the engineering vehicle chassis as described in any one of claims 1 to 13.

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