Low wear chain drive system for construction machines

Abstract

The application relates to the technical field of chain transmission structure, in particular to a low-wear chain transmission system for engineering machinery, which comprises a driving seat, two chain wheels, a chain assembly and an anti-shaking assembly. The driving seat is provided with a motor and a slidable shaft seat on the surface. The two chain wheels are respectively installed on the surface of the shaft rod of the motor output end and the shaft seat. The chain assembly is sleeved on the outer side of the two chain wheels. The surface of the chain wheel is provided with a guide groove and a gear tooth. The chain assembly comprises a plurality of chain blocks which are rotationally connected through pins. The two ends of the pin are provided with guide wheels. The bottom surface of the chain block is provided with gear teeth which are engaged with the gear tooth. The guide wheel and the guide groove are rolling matched, the sliding friction between the chain assembly and the chain wheel can be reduced, the gear tooth and the gear tooth adopt an arc gear structure, the transmission backlash can be reduced, the elastic thrust is provided to the guide sleeve on both sides, the guide sleeve forms the guide and the elastic limiting for the chain assembly, the swing, chain jumping and deviation of the chain assembly in the running process are reduced, and the stability and wear resistance of the chain transmission system are improved.

Description

Technical Field

[0001] This invention relates to the field of chain drive structure technology, specifically a low-wear chain drive system for engineering machinery. Background Technology

[0002] Existing chain drive systems mostly use a chain composed of chain plates, pins, and rollers that meshes with sprocket teeth for transmission. When the rollers enter or disengage from the teeth, they are simultaneously subjected to compression, slippage, and impact. Construction machinery experiences significant load variations, and after long-term operation, the chain is prone to loosening due to increased pin clearance, roller wear, and pitch changes. This leads to an increased meshing clearance between the chain and sprocket, easily causing meshing impacts, abnormal noises, and transmission lag. Ordinary sprockets primarily rely on the contact between the teeth and rollers to transmit force. When the chain is misaligned, it may also rub against the side of the sprocket, resulting in noticeable localized wear.

[0003] Furthermore, traditional chains and sprockets primarily rely on a single meshing point to transmit power, lacking synchronous rolling guidance for the chain's movement direction. This makes the chain's posture prone to deviation when entering the sprocket. If the shape transition of the contact area between the chain and the sprocket teeth is not smooth, significant backlash and contact impact can occur during meshing, affecting transmission stability. How to reduce chain-sprocket friction while simultaneously providing elastic guidance and positional compensation for chain movement remains a problem that needs to be solved in the chain drive structure of engineering machinery.

[0004] In view of this, we have studied and improved the existing problems to provide a low-wear chain drive system for engineering machinery, which solves the problems of large chain meshing wear, obvious transmission backlash, and easy swinging and deviation during operation. Summary of the Invention

[0005] The present invention aims to solve the problems of existing chain drive systems for engineering machinery under heavy load, high speed and variable load conditions, such as large sliding friction between chain and sprocket, obvious meshing back clearance, easy lateral swing, jumping and deviation in the linear motion area of ​​the chain, and the inability of existing rigid guide structures to elastically compensate for chain slack and impact conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A low-wear chain drive system for engineering machinery includes a drive base, on which two sprockets, a chain assembly, and an anti-vibration component are mounted. The two sprockets mesh with the chain assembly for transmission. The anti-vibration component includes an expansion joint and support plates fixed to both ends of the expansion joint. One end of each support plate is rotatably mounted on the surface of the drive base. The surface of the expansion joint is provided with a deformation portion. A guide sleeve is fixedly mounted on the surface of the expansion joint. The chain assembly slides through the inner side of the guide sleeve.

[0007] In a preferred embodiment, the motor is fixedly mounted on the surface of the drive seat, and a shaft seat is slidably mounted on the surface of the drive seat. A shaft is rotatably mounted on the surface of the shaft seat. Two sprockets are respectively sleeved on the output end of the motor and the surface of the shaft. The chain assembly is sleeved on the surfaces of the two sprockets.

[0008] In a preferred embodiment, the shaft seat is further configured such that it is slidably mounted on the surface of the drive seat in a direction close to or away from the motor. The surface of the drive seat is provided with an elastic element, one end of which is connected to the drive seat and the other end of which is connected to the shaft seat, for elastically pushing the shaft seat away from the motor.

[0009] In a preferred embodiment, the sprocket surface is provided with a plurality of guide grooves and teeth spaced apart along its circumference, the chain assembly includes a plurality of chain blocks and guide wheels, adjacent chain blocks are rotatably connected by a pin, both ends of the pin are rotatably mounted with guide wheels, and the bottom surface of the chain block is provided with teeth for meshing with the wheel teeth for transmission.

[0010] In a preferred embodiment, the expansion joint is further configured such that it is in the shape of an elastic arch, and both ends of the expansion joint are fixedly connected to two support plates respectively. The expansion joint is used to push the two support plates and the guide sleeve away from each other through elastic deformation.

[0011] In a preferred embodiment, the chain block is further configured such that each end of the chain block has a mutually compatible buckle groove and a protrusion, the buckle grooves and protrusions of two adjacent chain blocks are interlocked, and the pin passes through the buckle groove and the protrusion and is rotatably connected to the chain block.

[0012] In a preferred embodiment, the guide groove is further configured to be adapted to the shape and specifications of the guide wheel, the guide wheel rolls against the inner side of the guide groove, and the teeth are adapted to the shape and specifications of the wheel teeth, so that the chain assembly forms rolling guidance and meshing transmission with the sprocket through the guide wheel and the teeth respectively.

[0013] In a preferred embodiment, the guide sleeve is further configured as a groove-shaped structure extending along the direction of movement of the chain assembly, the chain block is located inside the guide sleeve, and the guide wheel rolls against the inner wall of the guide sleeve to limit the chain assembly from swinging in a direction perpendicular to its direction of movement.

[0014] In a preferred embodiment, the gear teeth and the toothed teeth are mutually adapted arc-shaped insert structures, wherein the toothed teeth are used to insert between adjacent gear teeth and mesh with the gear teeth for transmission as the chain assembly moves.

[0015] In a preferred embodiment, the deformable portion includes a plurality of strip grooves spaced apart along the length of the expansion bar, and the plurality of strip grooves are staggered along both sides of the expansion bar to improve the elastic deformation capability of the expansion bar.

[0016] The beneficial effects achieved by this invention are as follows: 1. In this invention, by using a chain assembly composed of several chain blocks, guide wheels and pins, the guide wheels can roll and guide within the guide groove of the sprocket, reducing the sliding friction between the chain assembly and the sprocket; at the same time, the teeth on the bottom surface of the chain blocks mesh with the teeth on the surface of the sprocket, and the meshing gap is reduced by using a matching arc-shaped tooth structure, thereby improving transmission stability and transmission accuracy.

[0017] 2. In this invention, by setting up an anti-shake component, the elastic arched expansion joint generates deformation thrust, keeping the two side support plates and guide sleeves in a relatively open state. When the chain assembly moves inside the guide sleeve, it is guided by rolling and laterally limited, which can reduce the swing amplitude of the chain assembly during high-speed transmission and load changes, and reduce chain skipping and offset phenomena.

[0018] 3. In this invention, the elastic deformation of the expansion sleeve provides a continuous thrust to the guide sleeves on both sides, so that the two guide sleeves form an elastic expansion thrust and guide limit on the chain assembly. This can elastically compensate for the movement state of the chain assembly, reduce the swing amplitude of the chain assembly, and improve the stability of the transmission process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the surface structure of the drive seat according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a chain assembly structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the sprocket and chain block structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a pendulum-limiting component structure according to an embodiment of the present invention; Figure 6 This is an exploded view of a chain assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a chain block and its surface guide wheel structure according to an embodiment of the present invention.

[0020] Figure label: 100. Drive seat; 110. Motor; 120. Shaft seat; 121. Shaft; 122. Elastic element; 200, sprocket; 210, guide groove; 220, gear tooth; 300. Chain assembly; 310. Chain block; 320. Guide pulley; 311. Tooth; 312. Pin; 400, Anti-shake component; 410, Expansion bar; 420, Support plate; 430, Guide sleeve; 411, Deformation part. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0022] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0023] The following describes, with reference to the accompanying drawings, some embodiments of a low-wear chain drive system for engineering machinery provided by the present invention.

[0024] Combination Figures 1-7 As shown, the present invention provides a low-wear chain drive system for engineering machinery, including a drive base 100, two sprockets 200, a chain assembly 300, and a vibration damping component 400. The drive base 100 serves as the mounting base for each transmission structure. The two sprockets 200 are spaced apart on the surface of the drive base 100. The chain assembly 300 is looped around the outside of the two sprockets 200 in a ring shape. The vibration damping component 400 is disposed in the linear motion area of ​​the chain assembly 300 and is used to guide and elastically limit the chain assembly 300.

[0025] A motor 110 is fixedly mounted on the surface of the drive base 100. The output end of the motor 110 extends in a direction perpendicular to the surface of the drive base 100, and one sprocket 200 is fixedly sleeved on the output end of the motor 110. A shaft seat 120 is also slidably mounted on the surface of the drive base 100, and a shaft 121 is rotatably mounted on the surface of the shaft seat 120. Another sprocket 200 is fixedly sleeved on the surface of the shaft 121. When the motor 110 is working, it drives the corresponding sprocket 200 to rotate. The sprocket 200 drives the other sprocket 200 and the shaft 121 to rotate synchronously through the chain assembly 300, thereby realizing the power transmission in the engineering machinery.

[0026] The bearing seat 120 is slidably mounted on the surface of the drive seat 100 in a direction that approaches or moves away from the motor 110. A linear sliding groove adapted to the bearing seat 120 may be provided on the surface of the drive seat 100, and the bottom of the bearing seat 120 is slidably embedded in this linear sliding groove, so that the bearing seat 120 can only move along the direction of the line connecting the centers of the two sprockets 200. An elastic element 122 is provided on the surface of the drive seat 100; one end of the elastic element 122 is fixedly connected to the drive seat 100, and the other end is connected to the bearing seat 120.

[0027] The elastic element 122 can be a compression spring, a tension spring, or other elastic component capable of continuously outputting elastic thrust. In this embodiment, the elastic element 122 is used to elastically push the shaft seat 120 away from the motor 110, causing the sprocket 200 mounted on the surface of the shaft 121 to tend to move away from the other sprocket 200. As a result, the center distance between the two sprockets 200 can be compensated under the action of the elastic element 122, keeping the chain assembly 300 in a relatively taut state.

[0028] When the chain assembly 300 experiences increased pitch or slight slack due to long-term transmission, the elastic element 122 pushes the bearing seat 120 and the corresponding sprocket 200 to move outward, automatically compensating for the slack in the chain assembly 300. When the chain assembly 300 is subjected to instantaneous impact or overload, the bearing seat 120 can overcome the thrust of the elastic element 122 and move slightly towards the motor 110 to buffer the impact load inside the chain assembly 300 and reduce the rigid impact on the chain block 310, pin 312 and sprocket 200.

[0029] The sprocket 200 has a disc-shaped structure, and its outer circumferential surface is provided with a plurality of guide grooves 210 and teeth 220. The guide grooves 210 and teeth 220 are all distributed at intervals along the circumference of the sprocket 200. The guide grooves 210 are used to roll with the guide wheel 320 in the chain assembly 300, and the teeth 220 are used to mesh with the teeth 311 on the bottom surface of the chain block 310 for transmission.

[0030] In this embodiment, guide grooves 210 are disposed on both axial sides of the sprocket 200, and the guide grooves 210 on both sides correspond to the positions of the guide wheels 320 at both ends of the pin 312. When the chain assembly 300 moves around the sprocket 200, the guide wheels 320 enter the corresponding guide grooves 210 and roll along the guide grooves 210, so that the chain assembly 300 maintains a stable axial position relative to the sprocket 200.

[0031] The width and arcuate profile of the guide groove 210 are adapted to the shape of the guide wheel 320, allowing the guide wheel 320 to roll freely inside the guide groove 210. When the chain assembly 300 engages with the sprocket 200, the chain assembly 300 does not rely entirely on the chain block 310 or the pin 312 to slide against the sprocket 200. Instead, the guide wheel 320 and the guide groove 210 form a rolling guide to reduce the frictional resistance of the chain assembly 300 as it enters and leaves the sprocket 200.

[0032] The chain assembly 300 includes a plurality of chain blocks 310, a plurality of guide wheels 320, and pins 312 for connecting adjacent chain blocks 310. The chain blocks 310 are connected end to end in sequence to form a closed chain structure. Adjacent chain blocks 310 can rotate relative to each other around the corresponding pins 312, so that the chain assembly 300 can adapt to the bending of the circumferential contour of the sprocket 200.

[0033] Each chain block 310 has a protrusion at one end and a buckle groove at the other end that matches the protrusion. When two adjacent chain blocks 310 are connected, the protrusion of one chain block 310 is inserted into the buckle groove of the other chain block 310, and the pin 312 passes through the buckle groove and the protrusion, so that the two adjacent chain blocks 310 are rotatably connected by the pin 312.

[0034] Both ends of the pin 312 extend out from both sides of the chain block 310, and guide wheels 320 are rotatably mounted on both ends of the pin 312. The guide wheels 320 can be sleeved onto the surface of the pin 312 through bushings, bearings, or rotational clearances, allowing the guide wheels 320 to rotate independently relative to the pin 312. When the chain assembly 300 runs to the sprocket 200 position, the guide wheels 320 on both sides roll into the guide grooves 210 on both sides of the sprocket 200.

[0035] The bottom surface of the chain block 310 is provided with teeth 311, which are used to mesh with the teeth 220 on the surface of the sprocket 200 for transmission. Both the teeth 311 and the teeth 220 are designed with mutually compatible arc-shaped insert structures. The side of the teeth 311 facing the sprocket 200 has an arc-shaped insertion surface, and an arc-shaped tooth gap is formed between the teeth 220 to match the teeth 311.

[0036] When the chain assembly 300 enters the meshing area of ​​the sprocket 200, the teeth 311 gradually insert between the adjacent teeth 220 along an arc-shaped trajectory. The arc-shaped tooth insertion structure can reduce the edge collision of the teeth 311 and the teeth 220 in the initial stage of engagement, and gradually increase the meshing surface of mutual contact, reducing the impact and noise generated when conventional straight teeth suddenly enter engagement.

[0037] The teeth 311 and 220 bear the main circumferential transmission force, while the guide wheel 320 and guide groove 210 provide rolling guidance and position correction for the chain assembly 300. Through the cooperation of the two engagement structures, the chain assembly 300 can maintain a relatively accurate posture when entering the sprocket 200, reducing the possibility of misalignment between the teeth 311 and the 220.

[0038] The use of an arc-shaped toothed structure between tooth 311 and gear tooth 220 increases the effective meshing area, gradually transforming the power transmission process from localized line contact to a smoother surface contact. When the chain assembly 300 reverses or the load changes, the fit between the arc-shaped tooth surfaces reduces the reverse meshing backlash, thereby reducing transmission backlash.

[0039] The image stabilization assembly 400 includes an expansion bar 410, two support plates 420, and a guide sleeve 430 disposed on the surface of the expansion bar 410. The two support plates 420 are respectively fixedly connected to both ends of the expansion bar 410, and the end of each support plate 420 away from the expansion bar 410 is rotatably mounted on the surface of the drive base 100, so that the two support plates 420 can be slightly deflected relative to the drive base 100.

[0040] The expansion joint 410 is in the shape of an elastic arch, with its two ends fixedly connected to two support plates 420 respectively. The expansion joint 410 is made of spring steel sheet, elastic alloy plate or other materials with elastic restoring ability, and maintains an outward arched shape in a free state. The surface of the expansion joint 410 is provided with a deformation part 411, which includes a number of strip grooves arranged at intervals along the length direction of the expansion joint 410.

[0041] Several strip grooves can be staggered along both sides of the expansion bar 410, so that the expansion bar 410 forms a continuously bent elastic connection area. When subjected to compression or tension, the deformation part 411 can generate elastic bending through the material area between the strip grooves, so as to improve the deformation capacity of the expansion bar 410 along the length direction and the arching direction, and avoid stress concentration at a single location.

[0042] A guide sleeve 430 is fixedly mounted on the surface of the expansion joint 410. The guide sleeve 430 has a groove-shaped structure that extends along the movement direction of the chain assembly 300. The chain assembly 300 slides through the inner side of the guide sleeve 430, and the chain block 310 is located in the guide space formed by the guide sleeve 430. The guide wheels 320 at both ends of the pin 312 can roll against the inner wall of the guide sleeve 430.

[0043] The inner width of the guide sleeve 430 is greater than the width of the chain block 310 and is adapted to the outer spacing of the two guide wheels 320, allowing the chain assembly 300 to move smoothly along the length of the guide sleeve 430. When the chain assembly 300 tends to swing laterally or deviate, the guide wheels 320 contact the inner wall of the guide sleeve 430 and roll along it, thereby limiting the displacement of the chain assembly 300 in the vertical direction of movement through the guide sleeve 430.

[0044] The anti-shake component 400 can be disposed on the upper or lower straight segment of the chain assembly 300, or multiple anti-shake components 400 can be disposed according to the length and load state of the chain assembly 300. In this embodiment, the two guide sleeves 430 are respectively located in the two straight movement areas of the chain assembly 300, and the expansion joint 410 is located between the two guide sleeves 430, and provides continuous thrust to the guide sleeves 430 on both sides through its own elastic deformation.

[0045] The expansion joint 410 applies a relatively distant elastic thrust to the side support plates 420 and guide sleeves 430, and the two guide sleeves 430 form an elastic expansion thrust on the corresponding straight segments of the chain assembly 300. When the chain assembly 300 becomes loose or vibrates due to load changes, the guide sleeves 430 can make small position adjustments under the deflection of the support plates 420 and the elastic deformation of the expansion joint 410, always maintaining the guiding function of the chain assembly 300.

[0046] Compared to a rigidly fixed guide rail structure, the anti-shake component 400 does not completely compress the chain assembly 300, but instead provides variable elastic constraint through the expansion joint 410. When the chain assembly 300 is in normal operation, the guide sleeve 430 restricts its lateral sway; when the chain assembly 300 experiences a momentary jump or load impact, the expansion joint 410 undergoes elastic deformation, allowing the guide sleeve 430 to retract appropriately to avoid a strong collision or jamming between the chain assembly 300 and the guide sleeve 430.

[0047] The expansion joint 410 in the anti-shake assembly 400 can also form a two-stage elastic compensation with the elastic element 122. The elastic element 122 compensates for the overall tension of the chain assembly 300 by adjusting the center distance between the two sprockets 200; the expansion joint 410 elastically restricts the local swaying of the chain assembly 300 in the linear motion area by pushing the guide sleeves 430 on both sides. The two have different positions of action and can work together to improve the motion state of the chain assembly 300 under heavy load and variable load conditions.

[0048] In use, the chain assembly 300 is first mounted around the outside of the two sprockets 200, so that the teeth 311 on the bottom surface of each chain block 310 correspond to the teeth 220 on the surface of the sprocket 200, and the guide wheels 320 at both ends of the pin 312 enter the guide grooves 210 on both sides of the sprocket 200. The elastic element 122 pushes the shaft seat 120 away from the motor 110, initially tensioning the chain assembly 300.

[0049] The linear motion area of ​​the chain assembly 300 passes through the inner side of the guide sleeve 430. The expansion bolt 410 maintains an elastic arched state and applies a thrust to the guide sleeve 430 through the end support plates 420, so that the guide sleeve 430 provides elastic guidance to the chain assembly 300. After installation is completed, the motor 110 is started, and the motor 110 drives the corresponding sprocket 200 to rotate.

[0050] When the sprocket 200 rotates, the teeth 220 mesh sequentially with the teeth 311 on the bottom surface of the chain block 310, driving the chain assembly 300 to circulate along the outer sides of the two sprockets 200. The guide wheel 320 synchronously enters the guide groove 210 and rolls along the guide groove 210, so that the chain assembly 300 maintains a stable engagement position on the surface of the sprocket 200, reducing the direct sliding friction between the chain block 310 and the sprocket 200.

[0051] After leaving the sprocket 200, the chain assembly 300 enters the linear motion region and moves along the inner side of the guide sleeve 430. When the chain assembly 300 experiences lateral displacement, the guide wheel 320 rolls against the inner wall of the guide sleeve 430, and the guide sleeve 430 restricts the chain assembly 300 from further displacement. When the chain assembly 300 experiences a large instantaneous jump, the guide sleeve 430 pushes the support plate 420 to deflect, and the expansion joint 410 undergoes elastic deformation through the deformation part 411 to buffer the impact.

[0052] When the chain assembly 300 becomes loose due to wear or long-term use, the elastic element 122 pushes the shaft seat 120 and the corresponding sprocket 200 outward, increasing the center distance between the two sprockets 200 and restoring tension to the chain assembly 300. Simultaneously, the expansion joint 410 provides elastic thrust to the guide sleeves 430 on both sides, locally expanding and pushing the straight section of the chain assembly 300 to reduce the vibration amplitude of the chain assembly 300.

[0053] Through the above structure, the chain assembly 300 achieves low-friction guidance through the rolling engagement between the guide wheel 320 and the guide groove 210, and the arc-shaped tooth structure between the teeth 311 and the gear teeth 220 is used to transmit power and reduce meshing backlash. The anti-vibration component 400 provides continuous elastic thrust to the guide sleeves 430 on both sides through the expansion joint 410, enabling the guide sleeves 430 to provide follow-up guidance and elastic limit for the chain assembly 300, while the elastic element 122 compensates for the overall slack of the chain assembly 300, thereby improving the operational stability and wear resistance of the chain drive system of engineering machinery.

[0054] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0055] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A low-wear chain drive system for engineering machinery, characterized in that, The device includes a drive base (100), on which two sprockets (200), a chain assembly (300), and a vibration damping assembly (400) are mounted. The two sprockets (200) mesh with the chain assembly (300) for transmission. The vibration damping assembly (400) includes an expansion bar (410) and support plates (420) fixed at both ends of the expansion bar (410). One end of the support plate (420) is rotatably mounted on the surface of the drive base (100). The surface of the expansion bar (410) is provided with a deformation part (411). A guide sleeve (430) is fixedly mounted on the surface of the expansion bar (410). The chain assembly (300) slides through the inside of the guide sleeve (430).

2. The low-wear chain drive system for engineering machinery according to claim 1, characterized in that, A motor (110) is fixedly mounted on the surface of the drive seat (100), and a shaft seat (120) is slidably mounted on the surface of the drive seat (100). A shaft rod (121) is rotatably mounted on the surface of the shaft seat (120). Two sprockets (200) are respectively sleeved on the output end of the motor (110) and the surface of the shaft rod (121). The chain assembly (300) is sleeved on the surfaces of the two sprockets (200).

3. The low-wear chain drive system for engineering machinery according to claim 2, characterized in that, The bearing seat (120) is slidably mounted on the surface of the drive seat (100) in a direction close to or away from the motor (110). The surface of the drive seat (100) is provided with an elastic element (122). One end of the elastic element (122) is connected to the drive seat (100), and the other end is connected to the bearing seat (120) for elastically pushing the bearing seat (120) away from the motor (110).

4. The low-wear chain drive system for engineering machinery according to claim 1, characterized in that, The sprocket (200) has a plurality of guide grooves (210) and teeth (220) spaced apart along its circumference. The chain assembly (300) includes a plurality of chain blocks (310) and guide wheels (320). Two adjacent chain blocks (310) are rotatably connected by a pin (312). Guide wheels (320) are rotatably mounted on both ends of the pin (312). The bottom surface of the chain block (310) is provided with teeth (311) for meshing and transmission with the teeth (220).

5. A low-wear chain drive system for engineering machinery according to claim 1, characterized in that, The expansion bar (410) is in the shape of an elastic arch, and the two ends of the expansion bar (410) are fixedly connected to two support plates (420) respectively. The expansion bar (410) is used to push the two support plates (420) and the guide sleeve (430) away from each other through elastic deformation.

6. A low-wear chain drive system for engineering machinery according to claim 4, characterized in that, The chain block (310) has matching buckle grooves and protrusions at both ends. The buckle grooves and protrusions of two adjacent chain blocks (310) are interlocked. The pin (312) passes through the buckle groove and protrusion and is rotatably connected to the chain block (310).

7. A low-wear chain drive system for engineering machinery according to claim 4, characterized in that, The shape and specifications of the guide groove (210) are adapted to the guide wheel (320), the guide wheel (320) rolls against the inner side of the guide groove (210), and the shape and specifications of the teeth (311) are adapted to the wheel teeth (220), so that the chain assembly (300) forms rolling guidance and meshing transmission with the sprocket (200) through the guide wheel (320) and the teeth (311).

8. A low-wear chain drive system for engineering machinery according to claim 4, characterized in that, The guide sleeve (430) has a groove-shaped structure extending along the movement direction of the chain assembly (300). The chain block (310) is located inside the guide sleeve (430). The guide wheel (320) rolls against the inner wall of the guide sleeve (430) to restrict the chain assembly (300) from swinging along a direction perpendicular to its movement direction.

9. A low-wear chain drive system for engineering machinery according to claim 4, characterized in that, The gear teeth (220) and the teeth (311) are both mutually compatible arc-shaped insert structures. The teeth (311) are used to insert between adjacent gear teeth (220) and mesh with the gear teeth (220) for transmission as the chain assembly (300) moves.

10. A low-wear chain drive system for engineering machinery according to claim 1, characterized in that, The deformation section (411) includes a plurality of strip grooves arranged at intervals along the length direction of the expansion bar (410). The plurality of strip grooves are staggered along both sides of the expansion bar (410) to improve the elastic deformation capability of the expansion bar (410).

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