Crawler belt tensioning device capable of conveniently adjusting pre-tightening force
By combining the design of the guide plate and the auxiliary tensioning device, the automatic tensioning and clearance adjustment of the track are realized, which solves the problem of high maintenance costs caused by hydraulic motors and improves the track tension and the walking performance of the excavator.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENDENG BODA MASCH CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-05-15
AI Technical Summary
Existing excavator track tensioning devices suffer from high maintenance costs due to hydraulic motors and dual-output transmissions, and decreased track tension leads to insufficient walking power or wear on the walking mechanism.
The system employs components such as a guide plate, a fixing frame, a sleeve, a lead screw, a disc spring, and an auxiliary tensioning wheel. The movement of the sleeve and lead screw is controlled by hydraulic oil to achieve automatic tensioning and repositioning of the track. The compression and reset functions of the disc spring, combined with the auxiliary tensioning device, enable adaptive adjustment of the track.
It reduces maintenance costs, improves the efficiency of track tension adjustment, avoids problems caused by insufficient track tension or excessive wear, and enhances the excavator's walking performance.
Smart Images
Figure CN224241136U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of track tensioning technology, specifically a track tensioning device that facilitates adjustment of preload. Background Technology
[0002] An excavator, also known as a digging machine or excavator, is an earthmoving machine that uses a bucket to excavate materials above or below the machine's bearing surface and load them into transport vehicles or unload them into a stockpile. The materials excavated by excavators are mainly soil, coal, silt, and pre-loosened soil and rock. In recent years, the development of construction machinery has been relatively rapid, and excavators have become one of the most important pieces of construction machinery. As excavators age, the track connecting pins and bushings of the traveling mechanism will wear down to some extent during normal operation, leading to a decrease in track tension. This can result in insufficient traveling power or excessive wear on the traveling mechanism.
[0003] Existing tracks, as disclosed in a patent (publication number CN 221233919U), present a utility model for an excavator track tensioning device, including a crossbeam, a shape adjustment frame, a rotating shaft, a tensioning main wheel, a threaded rod, a dual-output transmission, a hydraulic motor, a guide rod, a lead screw, a threaded sleeve, a lifting plate, a limit rod, a support frame, a second rotating shaft, track wheels, a sliding rod, a slider, and a spring. The hydraulic motor drives the dual-output transmission, which controls the tensioning main wheel via the threaded rod at its right end to tension the track, while simultaneously raising and lowering the track wheel via the lead screw at the upper end of the dual-output transmission, thus tightening or loosening the track. However, the hydraulic motor and dual-output transmission increase the machine's cost and maintenance expenses. Therefore, this application provides a track tensioning device that facilitates adjustment of preload to solve the problems mentioned in the background art. Summary of the Invention
[0004] The purpose of this invention is to provide a track tensioning device that facilitates adjustment of preload, thereby solving the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: A track tensioning device for easy adjustment of preload includes a guide base plate. The guide base plate has two sets of guide grooves inside. A fixed frame is slidably connected inside the guide grooves. A main tensioning wheel is rotatably connected to the left end of the fixed frame. A connecting frame is fixedly connected to the right end of the fixed frame. A sleeve is welded to the right end of the connecting frame. A one-way valve is provided on the sleeve. A lead screw is slidably connected inside the left end of the sleeve. A fixed plate is provided at the right end of the guide base plate. The fixed plate is engaged with the lead screw.
[0006] As a further embodiment of this utility model: the sleeve has a first groove inside, an installation tube is slidably connected inside the sleeve, the front and rear ends of the installation tube are provided with first splines, the first splines are slidably connected to the first groove, a disc spring is provided inside the sleeve, the left end of the disc spring is in contact with a compression plate, the front and rear ends of the compression plate are provided with second splines, the width of the second splines is greater than that of the compression plate, the front and rear ends of the installation tube are provided with second grooves at the splines, a limit plate is provided at the left end of the second groove, and the second splines are slidably connected inside the second groove.
[0007] As a further embodiment of this utility model: a sleeve shaft is rotatably connected to the fixed plate, the sleeve shaft has an internal thread, and the right end of the lead screw has an external thread. The fixed plate is connected to the right end of the lead screw by meshing the internal thread of the sleeve shaft with the external thread of the right end of the lead screw.
[0008] As a further improvement of this utility model: wherein the connecting frame is V-shaped.
[0009] As a further embodiment of this utility model: a base is bolted to the top of the guide base plate, and first vertical plates are fixedly connected to the front and rear ends of the base plate. Mounting columns are rotatably connected between the first vertical plates via a rotating shaft. A rotating plate is fixedly connected to the upper end of the mounting column. A set of second vertical plates is fixedly installed at both ends of the rotating plate. An auxiliary tensioning wheel is rotatably connected between each set of second vertical plates. Two guide plates are welded to the lower end of the mounting column. The guide plates are V-shaped.
[0010] As a further embodiment of this utility model: a spring is welded to the top of the base, a support plate is welded to the upper end of the spring, a guide rod is welded to the lower end of the support plate, the guide rod extends downward into the interior of the base and is slidably connected, the spring is sleeved on the guide rod, a set of second vertical plates is welded to the upper end of the support plate, and a rotating wheel is rotatably connected between the second vertical plates through a rotating shaft, and the rotating wheel is slidably connected to the guide plate.
[0011] As a further improvement of this utility model, the mounting column is provided with reinforcing ribs welded on both sides, and the reinforcing ribs are fixed to the rotating plate by bolts.
[0012] Compared with the prior art, the beneficial effects of this utility model are: by compressing the spring with the compression plate to make way for the main tension wheel, the main tension wheel can move left and right to tension the track. At the same time, an auxiliary tensioning device is provided at the upper end of the guide plate. When the main tensioning device makes way or tightens, the pressure applied by the track assists the main tension wheel to make way or tighten, thus avoiding damage to the track due to failure to tighten. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the track structure in this utility model;
[0014] Figure 2 This is a schematic diagram of the auxiliary tensioning device in this utility model;
[0015] Figure 3 This is a schematic diagram of the sleeve structure in this utility model;
[0016] Figure 4 This is a schematic cross-sectional view of the sleeve and mounting pipe in this utility model;
[0017] Figure 5 In this utility model Figure 4 Enlarged structural diagram at point A;
[0018] Figure 6 This is a schematic diagram of the disc spring structure in this utility model;
[0019] The correspondence between the labels and component names in the attached figures is as follows:
[0020] 1. Guide base plate; 12. Guide groove; 13. Fixing frame; 14. Main tensioning wheel; 15. Connecting frame; 16. Sleeve; 17. First slide groove; 18. Mounting tube; 19. First spline; 2. Second slide groove; 21. Compression plate; 22. Second spline; 23. Disc spring; 24. Chamber; 25. One-way valve; 26. Lead screw; 27. Limiting plate; 3. Fixing seat; 31. Fixing plate; 32. Sleeve shaft; 4. Track; 5. Base; 51. Spring; 52. Support plate; 53. Guide rod; 54. Mounting plate; 55. Rotating wheel; 56. First vertical plate; 57. Mounting column; 58. Rotating plate; 59. Second vertical plate; 6. Auxiliary tensioning wheel; 61. Guide plate; 62. Reinforcing rib; Detailed Implementation
[0021] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0022] refer to Figure 1 This is a schematic diagram of the guide substrate 1, with a clearance groove provided at the left end of the guide substrate 1; as shown... Figure 3 , Figure 4As shown, the left end of the guide base plate 1 has two sets of symmetrically distributed guide grooves 12. Each set of guide grooves 12 is slidably connected to a fixing frame 13. The left end of the fixing frame 13 is rotatably connected to a main tension wheel 14 via a rotating shaft. A connecting frame 15 is welded to the right end of the fixing frame 13. The connecting frame 15 is V-shaped, and the left end of the connecting frame 15 is a forked end. When the fixing frame 13 is subjected to a rightward force, it moves to the right on the guide groove 12. The fixing frame 13 transmits the force to the forked end of the connecting frame 15. The V-shaped design of the connecting frame 15 concentrates the force at the center. A sleeve 16 is welded to the center of the right end of the connecting frame 15.
[0023] like Figure 5 As shown, the sleeve 16 is made of NM400 wear-resistant steel, which has the advantages of high strength, good wear resistance, and good weldability. The sleeve 16 is hollow inside, and a first groove 17 is formed inside the sleeve 16. An installation tube 18 is slidably connected inside the sleeve 16. The front and rear ends of the installation tube 18 are welded with first splines 19, and the installation tube 18 slides on the first groove 17 through the first splines 19. The left end of the installation tube 18 forms a sealed chamber 24 inside the left end of the sleeve 16. A one-way valve 25 is set at the chamber 24 of the sleeve 16. A second groove 2 is formed inside the spline of the installation tube 18. A compression plate 21 is set inside the installation tube 18. The front and rear ends of the compression plate 21 are welded with second splines 22, and the compression plate 21 slides inside the installation tube 18 through the second splines 22 and the second groove 2. The width of the second spline 22 is greater than the width of the compression plate 21 to prevent the compression plate 21 from tilting when compressed to the right inside the mounting tube 18. A limit plate 27 is provided at the left end of the second slide groove 2 to prevent the compression plate 21 from separating from the mounting tube 18 when it moves to the left. A disc spring 23 is provided inside the mounting tube 18. The disc spring 23 has low maintenance cost; a single fatigued disc spring 23 can be replaced instead of replacing the entire set of disc springs 23. The disc spring 23 is in contact with the compression plate 21. Figure 6 (As shown). Grease is injected into the chamber 24 through the one-way valve 25 via a high-pressure oil gun. As the amount of grease increases, the internal space of the chamber decreases, and the grease begins to squeeze the compression plate 21. During the movement, the compression plate 21 pushes the mounting tube 18 to the right through the disc spring 23.
[0024] A lead screw 26 is slidably connected to the right end of the sleeve 16. The right end of the lead screw 26 is provided with an external thread. An injection hole is opened at the rear end of the guide base plate 1. A fixed seat 3 is provided on the right side of the guide base plate 1. The fixed seat 3 is connected to the track 4 chassis. A fixed plate 31 is welded to the upper end of the fixed seat 3. A sleeve shaft 32 is rotatably connected to the fixed plate 31. An internal thread is opened on the inner wall of the sleeve shaft 32. The sleeve shaft 32 meshes with the external thread of the lead screw 26 through the internal thread. A limit block is provided at the right end of the lead screw 26.
[0025] In this embodiment, grease is first injected into the chamber 24. The grease acts as a medium within the chamber 24. The right end pushes the compression plate 21 and disc spring 23 to move the mounting tube 18 to the right. When the mounting tube 18 moves to the right and contacts the lead screw 26, it stops moving. Grease is then injected further, increasing its volume and thus the thrust at both ends. The right end initially compresses the disc spring 23, while the left end pushes the sleeve 16, causing it to slide on the lead screw 26. At this point, the connecting frame 15 and the fixing frame 13 work together to drive the tensioning wheel 14 into initial contact with the track. Then, the lead screw 26 is controlled to rotate on the sleeve shaft 32, controlling the overall movement. This allows the tensioning wheel 14 to support the track, and simultaneously, the disc spring 23 is compressed.
[0026] When track 4 presses against a protrusion, track 4 applies a force to the main tensioner 14, causing the main tensioner 14 to move to the right to make way. The main tensioner 14 transmits the force to the fixed frame 13 and the connecting frame 15. The sleeve 16 is fixedly connected to the connecting frame 15. When the connecting frame 15 moves to the right, it can drive the sleeve 16 to move simultaneously. When the sleeve 16 moves to the right, it drives the grease to move to the right. Since the right side of the grease is in contact with the compression plate 21 and cannot move, the grease is compressed and transmits the force to the compression plate 21. The compression plate 21 moves to the right and compresses the disc spring 23, thus making way. When the track 4 stops applying pressure to the main tensioner 14 when it reaches flat ground, the pressure on the disc spring 23 disappears, and the disc spring 23 begins to reset. At the same time as resetting, it pushes the main tensioner 14 forward, thus realizing the tensioning function of track 4 when it is moving.
[0027] like Figure 1 , Figure 2As shown, an auxiliary tensioning device is provided at the upper end of the guide base plate 1. The auxiliary lifting device includes the top of the base 5 fixed to the guide base plate 1 by bolts. A spring 51 is fixedly installed on the base 5. A support plate 52 is fixedly connected to the spring 51. A guide rod 53 is welded to the lower end of the support plate 52. The guide rod 53 extends downward into the interior of the base 5 and slides up and down inside the base 5. The spring 51 supports the support plate 52 upward. At the same time, the guide rod 53 can only move up and down due to the limitation of the base 5, so as to avoid the support plate 52 from tilting due to uneven force. Mounting plates 54 are fixedly installed at both the front and rear ends of the inner support plate 52. Rotating wheels 55 are rotatably connected between the mounting plates 54 via a rotating shaft. First vertical plates 56 are welded to both the front and rear ends of the base 5. Mounting columns 57 are rotatably connected between the first vertical plates 56 via a rotating shaft. A rotating plate 58 is welded to the upper end of the mounting column 57. A set of second vertical plates 59 are fixedly installed at both the left and right ends of the rotating plate 58. Auxiliary tensioning wheels 6 are rotatably connected between each set of second vertical plates 59 via a rotating shaft. The auxiliary tensioning wheels 6 are movably connected to the track 4. A guide plate 61 is welded to the lower end of the mounting column 57, and the guide plate 61 is in close contact with the rotating wheels 55. Reinforcing ribs 62 are welded to the left and right sides of the upper end of the mounting column 57, and the reinforcing ribs 62 are connected to the rotating plate 58 via bolts.
[0028] In this embodiment, when the track 4 below the guide base plate 1 presses against the protruding object, the main tensioning wheel 14 moves to the right, compressing the disc spring 23 and making way for the track 4. After the track 4 above the guide base plate 1 is pulled downward to the left, the upper track 4 forms a shape that is lower on the left and higher on the right. The track 4 transmits the downward tilting force to the two auxiliary tensioning wheels 6. The auxiliary tensioning wheel 6 at the left end transmits the downward force to the left end of the rotating plate 58. The left end of the rotating plate 58 transmits the downward force to the moving mounting column 57. The mounting column 57 rotates counterclockwise on the first vertical plate 56 through the rotating shaft. At this time, the rotating plate 58 and the rotating wheel 55 form a state that is lower on the left and higher on the right. The left end of the rotating wheel 55 moves downward to make way for the track 4, and the right end of the rotating wheel 55 moves upward to deliver the reserved part of the track 4 to the left end of the rotating wheel 55 more quickly to make way for the track 4 (the track 4 needs to be reserved with a certain amount of slack when tensioning to prevent the track 4 from breaking during movement). Simultaneously, the mounting column 57 drives the guide plate 61 to rotate counterclockwise. When the guide plate 61 rotates counterclockwise, it applies a downward pressure to the right and downward on the contacting rotating wheel 55. After being subjected to pressure, the rotating wheel 55 can only move downward due to the limitation of the base 5 on the guide rod 53. When the rotating wheel 55 moves downward, it compresses the spring 51. The larger the volume of the object pressed by the track 4, the greater the downward compression of the spring 51. The downward tilt of the left rotating wheel 55 is greater, and the upward tilt of the right rotating wheel 55 is greater, thus allowing the track 4 to move faster and more effectively. When no object applies force to track 4, track 4 begins to slack, the main tension wheel 14 stops being under pressure, and the disc spring 23 begins to reset, moving the main tension wheel 14 to the left. The main tension wheel 14 tensions track 4, and at the same time, when track 4 is slack, it stops applying pressure to the auxiliary tension wheel 6. When spring 51 stops being under pressure, it begins to reset, and spring 51 drives rotating wheel 55 to move upward. During the upward movement, rotating wheel 55 slides on the guide plate 61 at the right end, and at the same time pushes the guide plate 61 to rotate clockwise. The guide plate 61 drives the mounting column 57 and rotating plate 58 to rotate clockwise. The rotating plate 58 moves the auxiliary tension wheel 6 at the left end upward, and the auxiliary tension wheel 6 at the left end lifts the left track 4 upward, thereby assisting the main tension wheel 14 to quickly tighten.
[0029] Working principle: When track 4 presses against an object, track 4 retracts inward, applying pressure to the main tension wheel 14. After receiving the force, the main tension wheel 14 moves to the right. The main tension wheel 14 transmits the force to the sleeve 16 through the fixing frame 13 and connecting frame 15. When the sleeve 16 moves to the right, it drives the grease to move to the right at the same time. The grease applies a rightward force to the compression plate 21. The compression plate 21 moves to the right on the second slide groove 2 through the second spline 22, compressing the disc spring 23 and making way for track 4. At the same time, track 4 applies a downward pressure to the auxiliary tension wheel 6. The auxiliary tension wheel 6 at the left end tilts downward, and the auxiliary tension wheel 6 at the right end moves upward. The rotating plate 58 is rotatably connected to the auxiliary tension wheel 6 through the second vertical plate 59 and the rotating shaft. The rotating plate 58 and the auxiliary tension wheel 6 tilt simultaneously. The rotating plate 58 drives the mounting column 57 and the guide plate 61 to rotate counterclockwise. When the guide plate 61 rotates counterclockwise, it applies pressure to the rotating wheel 55, causing the rotating wheel 55 to move downward and compress the spring 51. The auxiliary tensioning wheel 6 at the right end sends the reserved track 4 to the auxiliary tensioning wheel 6 at the left end more quickly, thus allowing the track 4 to move out of position more quickly.
[0030] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.
Claims
1. A track tensioning device for easy adjustment of preload, comprising a guide plate (1), characterized in that, The guide base plate (1) has two sets of guide grooves (12) inside. A fixed frame (13) is slidably connected inside the guide groove (12). A main tension wheel (14) is rotatably connected to the left end of the fixed frame (13). A connecting frame (15) is fixedly connected to the right end of the fixed frame (13). A sleeve (16) is welded to the right end of the connecting frame (15). A one-way valve (25) is provided on the sleeve (16). A lead screw (26) is slidably connected inside the left end of the sleeve (16). A fixed plate (31) is provided at the right end of the guide base plate (1). The fixed plate (31) is engaged with the lead screw (26).
2. The track tensioning device for easy adjustment of preload as described in claim 1, characterized in that, The sleeve (16) has a first groove (17) inside, and an installation tube (18) is slidably connected inside the sleeve (16). The front and rear ends of the installation tube (18) are provided with a first spline (19). The first spline (19) is slidably connected to the first groove (17). The sleeve (16) has a disc spring (23) inside. The left end of the disc spring (23) is in contact with a compression plate (21). The front and rear ends of the compression plate (21) are provided with a second spline (22). The width of the second spline (22) is greater than that of the compression plate (21). The front and rear ends of the installation tube (18) are provided with a second groove (2) at the spline. The left end of the second groove (2) is provided with a limit plate (27). The second spline (22) is slidably connected inside the second groove (2).
3. The track tensioning device for easy adjustment of preload according to claim 1, characterized in that, A sleeve shaft (32) is rotatably connected to the fixed plate (31). The sleeve shaft (32) has an internal thread, and the right end of the lead screw (26) has an external thread. The fixed plate (31) is connected to the right end of the lead screw (26) by meshing the internal thread of the sleeve shaft (32) with the external thread of the right end of the lead screw (26).
4. The track tensioning device for easy adjustment of preload according to claim 1, characterized in that, The connecting frame (15) is V-shaped.
5. The track tensioning device for easy adjustment of preload according to claim 1, characterized in that, The guide base plate (1) is bolted to the top of the base (5). The front and rear ends of the base (5) are fixedly connected to the first vertical plate (56). The first vertical plate (56) is rotatably connected to the mounting column (57) through a rotating shaft. The upper end of the mounting column (57) is fixedly connected to the rotating plate (58). A set of second vertical plates (59) are fixedly installed at both ends of the rotating plate (58). Each set of second vertical plates (59) is rotatably connected to the auxiliary tensioning wheel (6). The lower end of the mounting column (57) is welded with two guide plates (61). The guide plates (61) are V-shaped.
6. The track tensioning device for easy adjustment of preload according to claim 5, characterized in that, A spring (51) is welded to the top of the base (5), a support plate (52) is welded to the upper end of the spring (51), a guide rod (53) is welded to the lower end of the support plate (52), the guide rod (53) extends downward into the interior of the base (5) and is slidably connected, the spring (51) is sleeved on the guide rod (53), a set of second vertical plates (59) is welded to the upper end of the support plate (52), and a rotating wheel (55) is rotatably connected between the second vertical plates (59) through a rotating shaft, and the rotating wheel (55) is slidably connected to the guide plate (61).
7. The track tensioning device for easy adjustment of preload according to claim 5, characterized in that, The mounting column (57) is welded with reinforcing ribs (62) on both sides, and the reinforcing ribs (62) are fixed to the rotating plate (58) by bolts.