CN216580761U

CN216580761U - Crawler traveling chassis and engineering machinery

Info

Publication number: CN216580761U
Application number: CN202120976218.6U
Authority: CN
Inventors: 陈义才; 程盼; 宾旭洲; 李培; 张玲利
Original assignee: Guangxi Liugong Machinery Co Ltd; Liugong Changzhou Machinery Co Ltd; Liuzhou Liugong Excavators Co Ltd
Current assignee: Guangxi Liugong Machinery Co Ltd; Liugong Changzhou Machinery Co Ltd; Liuzhou Liugong Excavators Co Ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2022-05-24
Anticipated expiration: 2031-05-10

Abstract

The utility model relates to a track tensioning device, aiming at solving the problems that a cylinder assembly in the existing track tensioning device is easy to cause failure and has high manufacturing, using and maintaining cost, the utility model constructs a track tensioning device and engineering machinery, wherein a track walking chassis comprises a track beam and a guide wheel arranged at the front end of the track beam, the track tensioning device is arranged behind the guide wheel, the track tensioning device comprises a supporting seat connected with a supporting seat of a guide wheel shaft, a spring seat, a tensioning spring with two ends respectively connected with the supporting seat and the spring seat, a guide rod capable of sliding back and forth on the track beam and a screw mechanism for pushing the guide rod to slide back and forth; the front end of the guide rod is fixedly connected with the spring seat, and the rear end of the guide rod is connected with the screw mechanism. The tensioning device does not contain a hydraulic cylinder assembly, is simple in structure, low in possibility of causing faults in the using process and low in manufacturing, using and maintaining cost.

Description

Crawler traveling chassis and engineering machinery

Technical Field

The utility model relates to a crawler belt walking chassis, in particular to a crawler belt tensioning device and engineering machinery.

Background

For crawler-type walking engineering machinery such as an excavator, a bulldozer and the like, a driving motor is arranged at the rear end of a crawler beam, and a guide wheel is arranged at the front end of the crawler beam. The idler wheel can be adjusted back and forth within a certain range so as to adjust the tensioning degree of the track through the tensioning device.

The existing tensioning device comprises a supporting seat, a tensioning spring, a spring seat, an oil cylinder assembly, an oil filling valve and the like, wherein the oil cylinder assembly comprises a cylinder barrel, a plunger, a dust ring, an oil seal and the like. The two ends of the spring are respectively connected with the supporting seat and the spring seat, the spring seat is fixedly connected with a cylinder barrel or a plunger moving in the oil cylinder assembly, the plunger of the oil cylinder assembly stretches and retracts to drive the spring seat to stretch, so that the tensioning spring is compressed or released, and the tensioning spring is tensioned or loosened by connecting the supporting seat with the guide wheel.

The extension and retraction of the plunger in the cylinder assembly is achieved by injecting grease or releasing grease through the grease injection valve. Lubricating grease is injected through the oil injection valve, the lubricating grease extrudes a plunger in the oil cylinder, and the oil cylinder assembly compresses the spring through the spring seat, so that the tensioning of the crawler belt is realized. After the grease is released, the cylinder barrel in the oil cylinder assembly is retracted, and therefore the purpose of loosening the crawler belt is achieved.

The main failure parts of the tensioning device used at the present stage are still concentrated on the oil cylinder, and the failure phenomena mainly include sealing failure and failure of a grease valve, so that the tensioning device cannot tension and loosen the crawler. The excavator mainly concentrates on the operating mode that earth is more, and the butter filling opening is easily plugged up to earth, and the maintenance is difficult. The tensioning device belongs to a part with a high failure rate in the excavator, the maintenance cost is high, and economic losses are brought to after-sales service personnel and customers. The oil cylinder in the tensioning device has high cost, and brings great cost pressure to the small-digging main engine factory for manufacturing or purchasing.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems that the oil cylinder assembly in the existing track tensioning device is easy to cause failure and high in manufacturing, using and maintaining cost, and provides a track tensioning device and engineering machinery.

The technical scheme for realizing the purpose of the utility model is as follows: a crawler traveling chassis is constructed, and comprises a crawler beam and a guide wheel arranged at the front end of the crawler beam, wherein a crawler tensioning device is arranged behind the guide wheel; the front end of the guide rod is fixedly connected with the spring seat, and the rear end of the guide rod is connected with the screw mechanism. In the utility model, the screw rod is rotated to push the spring seat to move, so that the tension spring is compressed or loosened, and the support seat connected with the guide wheel moves to realize the tension adjustment of the crawler. The tensioning device does not contain a hydraulic cylinder assembly, is simple in structure, low in possibility of causing faults in the using process and low in manufacturing, using and maintaining cost.

In the crawler belt walking chassis, the crawler belt beam is provided with a guide support plate for supporting the guide rod, the guide support plate is provided with a guide hole, the guide rod is arranged in the guide hole in a front-back direction, and the side surface of the guide rod is in clearance fit with the wall surface of the guide hole. Further, the guide hole is a non-circular hole. The guide bar passes through the non-circular hole and cooperates with the direction backup pad, and the direction backup pad not only carries out the guide effect to the guide bar, still prevents simultaneously that the guide bar from rotating.

In the crawler belt walking chassis, the guide rod is provided with a limiting bulge for limiting the backward moving stroke of the guide rod.

In the crawler belt traveling chassis, the spiral mechanism comprises a rotating rod, a support limit plate for supporting the rotating rod is arranged on the crawler belt beam, and a circular hole is formed in the support limit plate; the rear end of the rotating rod is inserted into the round hole in the supporting limiting plate, the front end of the rotating rod is in threaded connection with the rear end of the guide rod, and a limiting protrusion used for being in axial limiting contact with the supporting limiting plate is arranged on the rotating rod. Furthermore, the rear end face of the guide rod is provided with a threaded hole for accommodating the front end of the rotating rod, and the front end of the rotating rod is provided with an external thread matched with the threaded hole; or the front end face of the rotating rod is provided with a threaded hole used for containing the rear end of the guide rod, and the front end of the guide rod is provided with external threads matched with the threaded hole.

In the crawler traveling chassis, the crawler beam is provided with a support limit plate for mounting the spiral mechanism, and the support limit plate is provided with a chute; the screw mechanism comprises an inclined wedge block and a screw rod, wherein the inclined wedge block is arranged in a sliding groove in the supporting limiting plate in a sliding mode, the screw rod is arranged on the supporting limiting plate and used for pushing the inclined wedge block to slide, and the rear end of the guide rod is in contact connection with an inclined wedge surface of the inclined wedge block. Further, the sliding direction of the wedge is perpendicular to the sliding direction of the guide rod. The rear end of the guide rod is provided with a roller, and the guide rod is in contact connection with the wedge surface of the wedge block through the roller.

The technical scheme for realizing the purpose of the utility model is as follows: the engineering machinery is characterized by comprising the crawler belt walking chassis, wherein the supporting seat is fixedly connected with a guide wheel arranged at the front part of a crawler belt beam.

Compared with the prior art, the tensioning device does not contain a hydraulic cylinder assembly, has a simple structure, low possibility of causing faults in the using process and low manufacturing, using and maintaining cost.

Drawings

Fig. 1 is a schematic structural view of a crawler chassis according to a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a track tensioning device according to a first embodiment of the utility model.

Fig. 3 is a schematic structural diagram of a guide support plate according to an embodiment of the present invention.

Fig. 4 is a schematic view of the installation structure of the track tensioning device on the track beam in the first embodiment of the utility model.

Fig. 5 is a partially enlarged view of a portion a in fig. 4.

Fig. 6 is a schematic structural view of a track tensioner in a second embodiment of the present invention.

Fig. 7 is a schematic view of the installation structure of the track tensioning device on the track beam in the second embodiment of the utility model.

Fig. 8 is a cross-sectional view schematically showing a crawler beam according to a second embodiment of the present invention.

Fig. 9 is a partial enlarged view at B in fig. 8.

Fig. 10 is a schematic structural view of a wedge block according to a second embodiment of the present invention.

Fig. 11 is a schematic structural view of a supporting and limiting plate according to a second embodiment of the utility model.

Fig. 12 is a schematic view of an installation structure of a screw in the second embodiment of the present invention.

Fig. 13 is a top view of a track beam according to a second embodiment of the present invention.

Fig. 14 is a partial enlarged view at C in fig. 13.

Part names and serial numbers in the figure:

the crawler belt type crawler belt tensioning device comprises a chassis 10, a crawler belt beam 11, guide wheels 12, a guide wheel shaft support 121, a crawler belt 13, a guide support plate 14, a guide hole 141, a support limit plate 15, a sliding groove 151, a crawler belt tensioning device 20, a support seat 21, a tensioning spring 22, a guide rod 23, a limit protrusion 231, a rotating rod 24, a limit protrusion 241, a rotating rod rear end 242, a spring seat 25, a roller 26, a wedge 32, a wedge surface 321, a screw 33 and a screw support 331.

Detailed Description

The following description of the embodiments refers to the accompanying drawings.

The first embodiment.

The crawler travel chassis 10 in the present embodiment is a travel chassis of a crawler travel construction machine, which may be a crawler excavator, a bulldozer, or the like.

As shown in fig. 1, the crawler chassis 10 includes a crawler beam 11, guide wheels 12 installed at a front end of the crawler beam, a driving wheel installed at a rear end of the crawler beam, a crawler belt 13, and the like. Behind the guide wheels 12 a track-tightening device 20 is arranged.

As shown in fig. 2, the track-tightening device 20 includes a support base 21 connected to the guide axle support 121, a spring base 25, a tension spring 22 having both ends connected to the support base 21 and the spring base 25, respectively, a guide rod 23 provided on the track beam 11 to be slidable forward and backward, and a screw mechanism for pushing the guide rod to slide forward and backward.

As shown in fig. 3, the track beam 11 is provided with a guide support plate 14 for supporting the guide bar, the guide support plate 14 is provided with a guide hole 141, the guide bar 23 is arranged in the guide hole 141 in a forward and backward direction, and a side surface of the guide bar 23 is in clearance fit with a wall surface of the guide hole 141. The guide hole 141 is a non-circular hole, for example, a square shape, and the cross-sectional profile shape of the guide rod 23 is adapted to the shape of the guide hole and also has a square shape. The guide bar 23 is matched with a guide support plate through a non-circular hole, and the guide support plate not only guides the guide bar, but also prevents the guide bar from rotating. As shown in fig. 2, the guide rod 23 is provided with a stopper projection 231 for restricting the rearward movement stroke of the guide rod 23.

As shown in fig. 4 and 5, the spiral mechanism includes a rotating rod 24, a supporting and limiting plate 15 for supporting the rotating rod 24 is disposed on the crawler beam 11, and a circular hole is disposed on the supporting and limiting plate 15; the rear end of the rotating rod 24 is inserted into the round hole in the supporting and limiting plate 15, the front end of the rotating rod 24 is in threaded connection with the rear end of the guide rod 23, and the rotating rod 24 is provided with a limiting protrusion 241 which is used for being in axial limiting contact with the supporting and limiting plate 15. The rear end face of guide rod 23 is provided with and is used for holding the screw hole of dwang front end, dwang 24 front end be provided with screw hole complex external screw thread. In specific implementation, a threaded hole for accommodating the rear end of the guide rod may be formed in the front end surface of the rotating rod 24, and an external thread matched with the threaded hole is formed in the front end of the guide rod.

In this embodiment, when the tensioning degree of the track is adjusted, the turning rod 24 is turned at the rear end of the turning rod by a wrench, the guide rod 23 does not turn but moves axially relative to the turning rod 24, and the guide rod 24 pushes the spring seat 25 to compress the tensioning spring 22 or retracts to release the tensioning spring 22. When the spring seat 25 moves towards the supporting seat, the spring seat 25 presses the tension spring 22, and the elastic force of the tension spring 22 acts on the guide wheel rotating shaft support 121 through the supporting seat 21 to push the guide wheel 12 to move forwards, so that the track is tensioned. When the spring seat 25 moves in a direction away from the support seat (toward the rear of the crawler beam), the tension spring is released, and the elasticity of the tension spring is reduced, so that the crawler is loosened. In this embodiment, track overspeed device tensioner 20 passes through the screw rod and rotates and adjust, and its low in manufacturing cost, in addition for prior art, it does not contain the hydro-cylinder subassembly, is difficult for breaking down in the use, and use cost is low.

Example two.

Compared with the first embodiment, the difference of the crawler belt walking chassis in the present embodiment is mainly in the crawler belt tensioning device.

As shown in fig. 6, the track-tightening device includes a support base 21 connected to the guide axle support, a spring base 25, a tension spring 22 having both ends connected to the support base 21 and the spring base 25, respectively, a guide rod 23 slidable forward and backward on the track beam 11, and a screw mechanism for pushing the guide rod 23 to slide forward and backward. Wherein the rear end of the guide bar 23 is provided with a roller 26.

In the present embodiment, as shown in fig. 7 to 14, a support limit plate 15 for mounting the screw mechanism is provided on the track beam, and the support limit plate 15 is provided with a chute 151, which has a structure shown in fig. 12. The screw mechanism comprises a wedge 32 slidably arranged in a chute 151 on the supporting limit plate and a screw 33 arranged on the supporting limit plate 15 and used for pushing the wedge 32 to slide, and the roller 26 at the rear end of the guide rod 23 is in contact connection with a wedge surface 321 of the wedge 32. The construction of the wedge 32 is shown in fig. 10.

As shown in fig. 9 and 14, the screw 33 is fixed to the track beam 11 by a screw bracket 331 and fixed relative to the support stopper plate 15. The screw 33 is fixedly connected with the wedge 32, the wedge 32 is slidably arranged in the sliding groove 151 of the supporting limit plate and is pushed by the screw 33 to move, and the moving direction of the wedge 32 is vertical to the moving direction of the guide rod. The roller 26 on the guide bar 23 contacts the cam surface of the cam block 32. When the screw 23 pushes the wedge block to move, the wedge block 32 pushes the guide rod to move forwards or backwards through the roller 26, and further compresses the tension spring or releases the tension spring, thereby playing a role of adjusting the tension degree of the spring.

The tensioning device does not contain a hydraulic cylinder assembly, has a simple structure, is low in possibility of causing faults in the using process, and is low in manufacturing, using and maintaining cost.

Claims

1. A crawler traveling chassis comprises a crawler beam and a guide wheel arranged at the front end of the crawler beam, wherein a crawler tensioning device is arranged behind the guide wheel, and the crawler traveling chassis is characterized in that the crawler tensioning device comprises a supporting seat connected with a guide wheel shaft support, a spring seat, a tensioning spring with two ends respectively connected with the supporting seat and the spring seat, a guide rod capable of sliding back and forth on the crawler beam, and a spiral mechanism for pushing the guide rod to slide back and forth; the front end of the guide rod is fixedly connected with the spring seat, and the rear end of the guide rod is connected with the screw mechanism.

2. The crawler belt chassis of claim 1, wherein the crawler belt beam is provided with a guide support plate for supporting a guide rod, the guide support plate is provided with a guide hole, the guide rod is arranged in the guide hole in a front-back direction, and a side surface of the guide rod is in clearance fit with a wall surface of the guide hole.

3. The crawler chassis of claim 2, wherein said guide holes are non-circular holes.

4. The crawler chassis of claim 2, wherein the guide bar is provided with a limiting protrusion for limiting the backward movement of the guide bar.

5. The crawler belt walking chassis according to any one of claims 1 to 4, wherein the screw mechanism comprises a rotating rod, a support limiting plate for supporting the rotating rod is arranged on the crawler belt beam, and a circular hole is arranged on the support limiting plate; the rear end of the rotating rod is inserted into the round hole in the supporting limiting plate, the front end of the rotating rod is in threaded connection with the rear end of the guide rod, and a limiting protrusion used for being in axial limiting contact with the supporting limiting plate is arranged on the rotating rod.

6. The crawler belt walking chassis according to claim 5, wherein the rear end surface of the guide rod is provided with a threaded hole for accommodating the front end of the rotating rod, and the front end of the rotating rod is provided with an external thread matched with the threaded hole; or the front end face of the rotating rod is provided with a threaded hole used for containing the rear end of the guide rod, and the front end of the guide rod is provided with external threads matched with the threaded hole.

7. The crawler chassis according to any one of claims 1 to 4, wherein a support limit plate for mounting the screw mechanism is provided on the crawler beam, the support limit plate being provided with a chute; the screw mechanism comprises an inclined wedge block and a screw rod, wherein the inclined wedge block is arranged in a sliding groove in the supporting limiting plate in a sliding mode, the screw rod is arranged on the supporting limiting plate and used for pushing the inclined wedge block to slide, and the rear end of the guide rod is in contact connection with an inclined wedge surface of the inclined wedge block.

8. The crawler chassis of claim 7, wherein a sliding direction of said sprags is perpendicular to a sliding direction of said guide rods.

9. The crawler chassis of claim 7, wherein the guide bar is provided at a rear end thereof with a roller, and the guide bar is in contact connection with the cam surface of the cam block via the roller.

10. A working machine characterized by a crawler chassis according to any of claims 1 to 9, said bearing blocks being fixedly connected to guide wheels mounted on the front of the crawler beams.