Crawler belt tensioning mechanism capable of adjusting limit and paver

Abstract

The crawler belt tensioning mechanism comprises a main rotating shaft, a tensioning oil cylinder and a connecting frame, the main rotating shaft is provided with a limiting block and a connecting shaft used for being connected with a guide wheel, one side of the main rotating shaft is hinged to the piston rod end of the tensioning oil cylinder, and the other side of the main rotating shaft is hinged to the connecting frame; one end of a cylinder body of the tensioning oil cylinder is connected with a connecting frame, the connecting frame is used for being fixedly connected with a frame, and a limiting rod is arranged on the connecting frame; when the piston rod of the tensioning oil cylinder extends out, the main rotating shaft rotates and drives the limiting block to approach the limiting rod, and the maximum extending distance of the piston rod of the tensioning oil cylinder depends on the distance between the limiting block and the limiting rod. Through cooperation of the limiting block and the limiting rod, the stretching stroke of the tensioning oil cylinder is limited, the situation that due to excessive stretching of the oil cylinder, the tensioning degree of a crawler belt is too large, running of the crawler belt is affected is avoided, and meanwhile oil cylinder disengaging is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field, and particularly to an adjustable limit crawler tensioning mechanism and a paver. Background Art

[0002] Tracked road pavers are widely used in highway construction. With the increasing number of application scenarios faced by working conditions, the fault feedback of the crawler device has been increasing continuously, its service life has been shortened, and more and more problems have been encountered in maintenance applications. In order to make the crawler adapt to more working conditions, a crawler tensioning mechanism needs to be installed to adjust the crawler tension according to different working conditions. The hydraulic tensioning mechanism is a commonly used crawler tensioning mechanism, which uses a unidirectional hydraulic cylinder to drive the idler wheel, thereby adjusting the crawler tension. However, the extension stroke of the unidirectional hydraulic cylinder is uncontrollable. If the cylinder extends too much, it will cause the crawler to be too tight, affect the crawler operation, shorten the service life of the crawler, and may cause the cylinder to be dislodged and damaged. Summary of the Invention

[0003] Object of the Invention: Aiming at the above disadvantages, the present invention provides an adjustable limit crawler tensioning mechanism and a paver, which can limit the extension of the cylinder, avoid the crawler tension being too large due to excessive cylinder extension, affect the crawler operation, and at the same time avoid the cylinder being dislodged; it can also realize stepless adjustment of the cylinder extension stroke, so that the crawler can adapt to more working conditions.

[0004] Technical Solution: To solve the above problems, the present invention adopts an adjustable limit crawler tensioning mechanism, including a main rotating shaft, a tensioning cylinder, and a connecting frame. A limit block and a connecting shaft for connecting with the idler wheel are arranged on the main rotating shaft. One side of the main rotating shaft is hinged to the piston rod end of the tensioning cylinder, and the other side of the main rotating shaft is hinged to the connecting frame. One end of the tensioning cylinder body is connected to the connecting frame, and the connecting frame is used for fixedly connecting with the vehicle frame. A limit rod is arranged on the connecting frame; when the piston rod of the tensioning cylinder extends, the main rotating shaft rotates and drives the limit block to approach the limit rod, and the maximum distance of the piston rod extension of the tensioning cylinder depends on the distance between the limit block and the limit rod.

[0005] Further, a first hinge point and a second hinge point are arranged on the main rotating shaft. The tensioning cylinder and the main rotating shaft are hinged at the first hinge point through a pin shaft, and the connecting frame and the main rotating shaft are hinged at the second hinge point through a pin shaft.

[0006] Further, the axes of the connecting shaft and the two pin shafts are parallel to each other, and the axis of the limit rod is perpendicular to the axis of the connecting shaft.

[0007] Further, a limit rod mounting hole is arranged on the connecting frame, and the limit rod is telescopically installed in the limit rod mounting hole.

[0008] Further, the limit rod is a bolt, and the limit rod mounting hole is a bolt hole. The distance between the limit block and the limit rod is changed by changing the length of the limit rod screwed into the limit rod mounting hole.

[0009] Further, the limiting rod is installed in the limiting rod mounting hole through a fixing nut.

[0010] Further, it further includes a fixing seat, and the connecting frame is connected to the fixing seat through a fixing shaft.

[0011] Further, it further includes a guide wheel, and the guide wheel is installed on the connecting shaft.

[0012] Further, it further includes a crawler belt, and the crawler belt is installed outside the guide wheel.

[0013] The present invention also provides a paver including the above-mentioned crawler belt tensioning mechanism with adjustable limit.

[0014] Beneficial effects: Compared with the prior art, the remarkable advantages of the present invention are: (1) Through the cooperation of the limiting block and the limiting rod, the extension stroke of the tensioning oil cylinder is restricted, avoiding excessive extension of the oil cylinder and excessive tension of the crawler belt, which affects the operation of the crawler belt, and at the same time avoiding the oil cylinder from being out of the cylinder; (2) The extension length of the limiting rod can be flexibly adjusted, thereby changing the distance between the limiting block and the limiting rod, realizing stepless adjustment of the extension stroke of the oil cylinder, and enabling the crawler belt to adapt to more working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the crawler belt tensioning mechanism of the present invention;

[0016] Figure 2 is a schematic diagram of the main rotating shaft structure of the present invention;

[0017] Figure 3 is a schematic diagram of the connecting frame structure of the present invention;

[0018] Figure 4 is a schematic diagram of the retracted state of the tensioning oil cylinder of the present invention;

[0019] Figure 5 is a schematic diagram of the extended state of the tensioning oil cylinder of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] As Figure 1 shown, a crawler belt tensioning mechanism with adjustable limit in this embodiment includes a main rotating shaft 1, a tensioning oil cylinder 2, a connecting frame 3 and a fixing seat 4. The fixing seat 4 is fixedly installed on the vehicle frame, and the connecting frame 3 is connected to the fixing seat 4 through a fixing shaft 5. As Figure 2As shown in the figure, a limiting block 11, a connecting shaft 12, a first hinge point 13 and a second hinge point 14 are provided on the main rotating shaft 1. The guide wheel 8 is installed on the connecting shaft 12, and the crawler belt 9 is installed outside the guide wheel 8. The piston rod end of the tensioning oil cylinder 2 is hinged to the main rotating shaft 1 through a pin shaft at the first hinge point 13, and the connecting frame 3 is hinged to the main rotating shaft 1 through a pin shaft at the second hinge point 14. The axes of the connecting shaft 12 and the two pin shafts are parallel to each other. One end of the cylinder body of the tensioning oil cylinder 2 is connected to the connecting frame 3. The limiting block 11 is arranged at the lower part of the main rotating shaft 1.

[0021] As Figure 3 shown in the figure, a limiting rod mounting hole 31, a third hinge hole 32 for connecting with the main rotating shaft 1, a fourth hinge hole 33 for connecting with the tensioning oil cylinder 2, and a mounting hole 34 for installing the fixed shaft 5 are provided on the connecting frame 3. A limiting rod 6 is installed in the limiting rod mounting hole 31, and the axis of the limiting rod 6 is perpendicular to the axis of the connecting shaft 12. Specifically, the limiting rod 6 is a bolt, the limiting rod mounting hole 31 is a bolt hole, and the limiting rod 6 is installed in the limiting rod mounting hole 31 through a fixing nut 7. By changing the length of the limiting rod 6 screwed into the limiting rod mounting hole 31, the distance between the limiting block 11 and the limiting rod 6 is changed.

[0022] As Figure 4 and Figure 5 shown in the figure, the working principle of the present invention is as follows: when the tensioning oil cylinder 2 extends, the main rotating shaft 1 rotates around the second hinge point 14 as the rotation center, driving the guide wheel 8 and the crawler belt 9 to approach and press against each other, improving the crawler belt tension. When the limiting block 11 abuts against the limiting rod 6, the tensioning oil cylinder 2 cannot continue to extend, preventing the oil cylinder from extending too much and causing the crawler belt tension to be too large, which affects the operation of the crawler belt and also prevents the oil cylinder from being dislodged from the cylinder. In addition, according to the requirements of different working conditions for the tension, the extension length of the limiting rod 6 can be adjusted, and then the distance between the limiting block 11 and the limiting rod 6 can be changed, realizing stepless adjustment of the stroke of the oil cylinder extension, so that the crawler belt can adapt to more working conditions.

Claims

1. An adjustable limit crawler tensioning mechanism, characterized in that, It includes a main rotating shaft (1), a tensioning oil cylinder (2), and a connecting frame (3). A limiting block (11) and a connecting shaft (12) for connecting with a guide wheel are arranged on the main rotating shaft (1). One side of the main rotating shaft (1) is hinged to the piston rod end of the tensioning oil cylinder (2), and the other side of the main rotating shaft (1) is hinged to the connecting frame (3). One end of the cylinder body of the tensioning oil cylinder (2) is connected to the connecting frame (3). The connecting frame (3) is used for fixedly connecting with the vehicle frame, and a limiting rod (6) is arranged on the connecting frame (3). When the piston rod of the tensioning oil cylinder (2) extends, the main rotating shaft (1) rotates and drives the limiting block (11) to approach the limiting rod (6). The maximum distance that the piston rod of the tensioning oil cylinder (2) extends depends on the distance between the limiting block (11) and the limiting rod (6).

2. The adjustable limit crawler tensioning mechanism according to claim 1, characterized in that A first hinge point (13) and a second hinge point (14) are arranged on the main rotating shaft (1). The tensioning oil cylinder (2) and the main rotating shaft (1) are hinged at the first hinge point (13) through a pin shaft, and the connecting frame (3) and the main rotating shaft (1) are hinged at the second hinge point (14) through a pin shaft.

3. The adjustable limit track tensioning mechanism according to claim 1, characterized in that, The axes of the connecting shaft (12) and the two pin shafts are parallel to each other, and the axis of the limiting rod (6) is perpendicular to the axis of the connecting shaft (12).

4. The adjustable limit crawler tensioning mechanism according to claim 1, characterized in that, A limiting rod mounting hole (31) is arranged on the connecting frame (3), and the limiting rod (6) is telescopically mounted in the limiting rod mounting hole (31).

5. The adjustable limit crawler tensioning mechanism according to claim 4, wherein The limiting rod (6) is a bolt, and the limiting rod mounting hole (31) is a bolt hole. The distance between the limiting block (11) and the limiting rod (6) is changed by changing the length of the limiting rod (6) screwed into the limiting rod mounting hole (31).

6. The adjustable limit crawler tensioning mechanism according to claim 5, characterized in that The limiting rod (6) is mounted in the limiting rod mounting hole (31) through a fixing nut (7).

7. The track tensioning mechanism with adjustable limit as claimed in claim 1, wherein It further includes a fixed seat (4), and the connecting frame (3) is connected to the fixed seat (4) through a fixed shaft (5).

8. The adjustable limit crawler tensioning mechanism according to claim 1, characterized in that, It further includes a guide wheel (8), and the guide wheel (8) is mounted on the connecting shaft (12).

9. The adjustable limit crawler tensioning mechanism according to claim 8, characterized in that, It further includes a crawler belt (9), and the crawler belt (9) is mounted outside the guide wheel (8).

10. A paver, characterized in that, It includes the crawler belt tensioning mechanism with adjustable limit described in any one of claims 1-9.

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