CN216805635U

CN216805635U - Track tensioning device with automatically adjusted tensioning force

Info

Publication number: CN216805635U
Application number: CN202122788776.2U
Authority: CN
Inventors: 周涛; 张爱军; 缪勤竹; 卞立铭
Original assignee: Jiangsu Changling Hydraulic Co ltd
Current assignee: Jiangsu Changling Hydraulic Co ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-06-24
Anticipated expiration: 2031-11-15

Abstract

The utility model relates to a track tensioning device with automatically adjusted tensioning force, which comprises a cylinder body, wherein a tensioning rod and a chassis connecting rod respectively extend into a through hole of the cylinder body from two ends of the cylinder body, the part outside the cylinder body of the tensioning rod is in sliding connection with a tensioning frame, a flange is arranged at the end part of the cylinder body, which is at the same side with the chassis connecting rod, one end of a spring is propped against the flange, the other end of the spring is propped against a spring tensioning surface of the tensioning frame, an oil-filled adjusting ring is arranged between one end of the spring and the flange or the spring tensioning surface, an oil-filled valve is arranged on the oil-filled adjusting ring, the oil-filled adjusting ring comprises an internal rubber oil-filled ring and a box body arranged outside the rubber oil-filled ring, the box body comprises a box body I and a box body II, the box body I and the box body II are buckled together along the telescopic direction of the spring, and when the elasticity of the spring is reduced, liquid is filled into the oil-filled adjusting ring through the oil-filled valve, so that the volume of the oil-filled adjusting ring is increased to compress the spring, the spring continues to effectively tension the track.

Description

Track tensioning device with automatically adjusted tensioning force

Technical Field

The present invention relates to a crawler belt tensioner, and more particularly to a crawler belt tensioner for a traveling mechanism of a construction machine such as an excavator.

Background

The crawler traveling device has the excellent characteristics of large traction force, low ground pressure ratio, strong climbing capability, small turning radius and the like, so the crawler traveling device is widely applied to the fields of engineering machinery, mining machinery, construction machinery and the like, and is particularly commonly applied to large and medium self-propelled machinery, such as trenchers, excavators, piling machinery, drilling machines and the like. While the track tensioner has a significant impact on track travel performance. In the prior art, the main methods for tensioning the caterpillar include a spring tensioning method, a cylinder tensioning method and a screw tensioning method. If a spring tensioning method is adopted, because the elastic force of the spring and the structural size of the spring have a certain proportional relation, the size of the spring is too small, the elastic force of the spring is not enough to keep the crawler in a tensioned state, and the size of the spring is too large, so that the mechanical structure of the crawler is not easy to install and use. In addition, the spring is reduced in elasticity in a long-term accepted state, and when the spring is reduced in elasticity, the tension of the spring on the crawler belt is insufficient. Accordingly, there is a need for an improved construction of an existing track tensioner.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and designs a track tensioning device. The device can ensure proper tensioning force of the crawler; when the guide wheels are subjected to a forward impact load, the buffer springs retract to absorb vibration, preventing the track and the drive wheels from being damaged. After the elasticity of spring reduces, in order to prevent the tensile force not enough, the tensile force of spring can be increased to the accessible oil charge regulation circle.

In order to achieve the purpose, the technical scheme of the utility model is that the crawler tensioning device capable of automatically adjusting the tensioning force is adopted, the crawler tensioning device comprises a cylinder body, a tensioning rod and a chassis connecting rod respectively extend into a through hole of the cylinder body from two ends of the cylinder body, an oil filling cavity is formed by the tensioning rod, the chassis connecting rod and the inner wall of the through hole, hydraulic oil is filled in the oil filling cavity, the part outside the cylinder body of the tensioning rod is in sliding connection with a tensioning frame, a flange is arranged at the end part of the cylinder body on the same side with the chassis connecting rod, one end of a spring is pressed on the flange, the other end of the spring is pressed on a spring tensioning surface of the tensioning frame, an oil filling adjusting ring is arranged between the spring and the flange or the spring tensioning surface, and an oil filling valve is arranged on the oil filling adjusting ring. The chassis connecting rod is located the outer one end of cylinder and is connected with crawler travel unit's chassis limiting plate, and the tensioning frame is used for connecting the leading wheel, and the tensioning frame plays the tensioning roof pressure effect to the leading wheel, and the cover is established at the spring of cylinder body periphery, makes the track obtain certain pretension force, runs into when strikeing in operation at the track, plays the effect that can also cushion through flexible. And when the elasticity of the spring is reduced, hydraulic oil is injected into the oil-filled adjusting ring through the oil-filled valve, so that the volume of the oil-filled adjusting ring is increased to compress the spring, and the spring can continuously and effectively tension the track.

As a further improvement of the utility model, one end of the tension rod extending into the through hole is provided with a step surface, the end part of the through hole is provided with a step hole matched with the step surface, the end part of the chassis connecting rod positioned outside the cylinder body is provided with an oil filling port, the oil filling port is communicated with the oil filling cavity through the oil filling hole in the chassis connecting rod, and the oil filling port is provided with an oil filling valve. The stepped surface and the stepped hole play a role in limiting the tension rod in the cylinder body, and the oil injection valve and the oil injection hole are convenient to fill hydraulic oil into the oil injection cavity.

As a further improvement of the utility model, the spring tension surface is provided with an annular protrusion, the spring is sleeved on the annular protrusion, and the end part of the spring is pressed against the spring tension surface. The annular protrusion facilitates installation of the spring and simultaneously plays a role in positioning the spring.

As a further improvement of the utility model, an oil-filled adjusting ring is arranged between one end of the spring and the spring tensioning surface of the spring, and a pressure sensor is arranged between the other end of the spring and the flange. The pressure sensor can measure the pressure of the spring.

As a further improvement of the utility model, the pressure sensor is connected with the controller, the controller is connected with the oil pump, and the oil pump is connected with the oil filling valve. When the pressure is lower than the set value, the controller controls the oil pump to operate, and the oil pump injects hydraulic oil into the oil filling adjusting ring through the oil filling valve to adjust the tension.

As a further improvement of the utility model, the flange and/or the spring tension surface are/is provided with an annular groove, and the annular groove is matched with the pressure sensor and the oil-filled adjusting ring respectively in shape. The annular groove plays a positioning role for the pressure sensor and the oil-filled adjusting ring, and the pressure sensor and the oil-filled adjusting ring are prevented from moving on the flange or the spring tensioning surface.

As a further improvement of the utility model, the tensioning rod passes through a connecting hole of the tensioning frame to be in sliding fit with the tensioning frame, the end part of the tensioning rod is provided with a thread, the limiting nut is arranged on the tensioning rod through the thread, and a sliding bearing in interference fit with the connecting hole is arranged in the connecting hole. Slide bearing makes the slip between tensioning rod and the tensioning frame more smooth and easy, and stop nut plays limiting displacement to the tensioning frame, avoids tensioning frame roll-off tensioning rod.

As a further improvement of the utility model, two ends of the through hole are respectively provided with two sealing grooves, a dustproof ring and an O-shaped sealing ring are arranged in the two sealing grooves at each end, and the dustproof ring is arranged close to the end face of the through hole. The O-shaped sealing ring ensures the sealing of hydraulic oil in the oil injection cavity, and the dustproof ring prevents dust and other impurities from entering the cylinder body to cause the abrasion of the inner wall of the cylinder body.

As a further improvement to the utility model, the filling valve and/or the filling valve is a one-way valve. The check valve avoids pollution or waste caused by the backflow of the hydraulic oil.

As a further improvement of the utility model, the oil-filling adjusting ring comprises an internal rubber oil-filling ring and a box body arranged outside the rubber oil-filling ring, the box body comprises a box body I and a box body II, and the box body I and the box body II are buckled together along the extension direction of the spring. The first box body and the second box body have a protection effect on the rubber oil filling rings, and after the rubber oil filling rings are filled with hydraulic oil, the first box body and the second box body slide relatively along the buckling direction, so that the tension force is adjusted by compressing the spring.

As a further improvement of the utility model, the tensioning frame is U-shaped, the opening of the tensioning frame is opposite to the cylinder body, two connecting end faces are arranged at two end parts of the opening, and a through hole serving as a connecting part of the tensioning wheel is arranged on the connecting end faces. The U-shaped tensioning frame is simple in structure and more economical.

The utility model has the advantages and beneficial effects that: the chassis connecting rod is located the outer one end of cylinder and is connected with crawler travel unit's chassis limiting plate, and the length that the chassis connecting rod stretches out the cylinder body can be adjusted to the filling oil intracavity packing hydraulic oil, and the tensioning frame is used for connecting the guide wheel, and the tensioning frame plays tensioning roof pressure effect to the guide wheel, and the cover is established at the spring of cylinder body periphery, makes the track obtain certain pretension force, when the track meets the impact in service, plays the effect that can also cushion through flexible. And when the elasticity of the spring is reduced, hydraulic oil is injected into the oil-filled adjusting ring through the oil-filled valve, so that the volume of the oil-filled adjusting ring is increased to compress the spring, and the spring can continuously and effectively tension the track. The stepped surface and the stepped hole play a role in limiting the tension rod in the cylinder body, and the oil injection valve and the oil injection hole are convenient to fill hydraulic oil into the oil injection cavity. The annular protrusion facilitates installation of the spring and simultaneously plays a role in positioning the spring. The pressure sensor can measure the pressure of the spring, the pressure is lower than a set value, the controller controls the oil pump to operate, and the oil pump injects hydraulic oil into the oil filling adjusting ring through the oil filling valve to adjust the tension. The annular groove plays a positioning role for the pressure sensor and the oil-filled adjusting ring, and the pressure sensor and the oil-filled adjusting ring are prevented from moving on the flange or the spring tensioning surface. Slide bearing makes the slip between tensioning rod and the tensioning frame more smooth and easy, and stop nut plays limiting displacement to the tensioning frame, avoids tensioning frame roll-off tensioning rod. The O-shaped sealing ring ensures the sealing of hydraulic oil in the oil injection cavity, and the dustproof ring prevents dust and other impurities from entering the cylinder body to cause the abrasion of the inner wall of the cylinder body. The first box body and the second box body have a protection effect on the rubber oil filling rings, and after the rubber oil filling rings are filled with hydraulic oil, the first box body and the second box body slide relatively along the buckling direction, so that the tension force is adjusted by compressing the spring. The U-shaped tensioning frame is simple in structure and more economical.

Drawings

Fig. 1 is a schematic view of a track tensioner with automatic tension adjustment according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of an oil-filled regulating ring in example 1 of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is a schematic view of an oil-filled adjusting ring in example 2 of the present invention;

FIG. 5 is a cross-sectional view of FIG. 4, when the rubber oil filled ring is not filled with oil;

FIG. 6 is a cross-sectional view of FIG. 4, when the rubber oil filled ring is filled with oil.

In the figure: 1. a cylinder body; 2. a chassis link; 3. a tension rod; 4. a tension frame; 5. a tension wheel connecting portion; 6. a spring; 7. a pressure sensor; 8. an oil-filled adjusting ring; 9. a limit nut; 10. a step surface; 11. an oil filler hole; 12. an oil filling port; 13. an oil injection cavity; 14. an oil filling valve; 15. a flange; 16. an annular protrusion; 17. a spring tension surface; 18. a sliding bearing; 19. an annular groove; 20. a dust ring; 21. an O-shaped sealing ring; 22. an oil-filled valve; 81-rubber oil filling ring 82 and a first box body; 83. case body 2

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 6, the technical solution of the present invention is:

example 1:

the utility model provides a tensioning force automatically regulated's track overspeed device tensioner, including cylinder body 1, tensioning rod 3 and chassis connecting rod 2 stretch into the through-hole of cylinder body 1 from the both ends of cylinder body respectively, tensioning rod and chassis connecting rod and through-hole inner wall form oiling chamber 13, the oiling intracavity is filled with hydraulic oil, tensioning rod 3 its cylinder body external part and tensioning frame 4 sliding connection, the tip of cylinder body 1 and chassis connecting rod 2 homonymy is equipped with

flange

15, 6 one end roof pressures of spring are on flange 15, the other end roof pressure is on the spring tensioning face 17 of tensioning frame, be equipped with oil charge regulating ring 8 between the one end of spring 6 and the spring tensioning face 17, be equipped with pressure sensor 7 between the other end of spring and the flange 15, be equipped with oil charge valve 22 on the oil charge regulating ring. One end that tensioning rod 3 stretched into the through-hole is equipped with ladder face 10, and the through-hole tip is equipped with the shoulder hole with ladder face 10 adaptation, and the tip that chassis connecting rod 2 is located 1 outer of cylinder body is equipped with oiling mouth 12, and oiling mouth is through the inside oil filler point 11 intercommunication oil filling cavity of chassis connecting rod, and oiling mouth 12 is equipped with oiling valve 14. The spring tension surface 17 is provided with an annular protrusion 16, the spring is sleeved on the annular protrusion, and the end part of the spring is pressed against the spring tension surface 17. The pressure sensor 7 is connected with a controller, the controller is connected with an oil pump, and the oil pump is connected with an oil filling valve. And the flange 15 and the spring tensioning surface 17 are provided with annular grooves 19, and the annular grooves 19 are respectively matched with the pressure sensor and the oil-filled adjusting ring in appearance. Tensioning rod 3 passes the connecting hole and the tensioning frame sliding fit of tensioning frame 4, and the tip of tensioning rod 3 is equipped with the screw thread, and stop nut 9 passes through the screw thread to be installed on tensioning rod 3, be equipped with in the connecting hole rather than interference fit's slide bearing 18. Two ends of the through hole are respectively provided with two sealing grooves, a dustproof ring 20 and an O-shaped sealing ring 21 are arranged in the two sealing grooves at each end, and the dustproof ring 20 is arranged close to the end face of the through hole. The fill valve 14 and the fill valve 22 are check valves. The tensioning frame 4 is U-shaped, the opening of the tensioning frame faces away from the cylinder body, two connecting end faces are arranged at two end parts of the opening, and through holes serving as tensioning wheel connecting parts 5 are arranged on the connecting end faces.

Example 2:

the difference from the embodiment 1 is that: the oil-filling adjusting ring 8 comprises an inner rubber oil-filling ring 81 and a box body arranged outside the rubber oil-filling ring, an oil-filling valve is arranged on the rubber oil-filling ring 81, the box body comprises a first box body 82 and a second box body 83, the first box body 82 and the second box body 83 are buckled together along the telescopic direction of a spring, an oil-filling hole is further formed in the first box body 82, and the oil-filling hole corresponds to the position of the oil-filling valve of the rubber oil-filling ring 81. For convenience of illustration, the oil charge hole and the oil charge valve are not shown in the drawings.

The crawler belt pre-tensioning device has the following working principle that one end, located outside a cylinder body, of a chassis connecting rod is connected with a chassis limiting plate of a crawler belt walking device, hydraulic oil is filled in an oil filling cavity to adjust the length of the chassis connecting rod extending out of the cylinder body, a tensioning frame is used for connecting a guide wheel and plays a role in tensioning and jacking the guide wheel, and a spring sleeved on the periphery of the cylinder body enables the crawler belt to obtain a certain pre-tensioning force and plays a role in buffering through stretching when the crawler belt encounters impact in the running process. When the elasticity of the spring is reduced, hydraulic oil is injected into the oil filling adjusting ring through the oil filling valve, so that the volume of the oil filling adjusting ring is increased, the spring is compressed, and the spring can continuously and effectively tension the crawler belt. The tensioning device has the characteristics of simple structure, reliable work, improved stability during driving and convenient modification.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a tensioning force automatically regulated's track overspeed device tensioner which characterized in that: including cylinder body (1), be equipped with oil charge regulation circle (8) between the one end of spring (6) and the spring tensioning face (17) on the tensioning frame, be equipped with pressure sensor (7) between the other end and flange (15), be equipped with the oil charge valve on the oil charge regulation circle, pressure sensor is connected with the controller, and the controller is connected with the oil pump, and the oil pump is connected with the oil charge valve, and oil charge regulation circle (8) fill oil circle (81) and set up the box outside at rubber oil charge circle including inside rubber, the box includes box (82) and box two (83), and box one and box two are in the same place along the flexible direction lock of spring.

2. The track tensioner as claimed in claim 1, wherein the tension is automatically adjusted by: tensioning rod (3) and chassis connecting rod (2) stretch into the through-hole of cylinder body (1) from the both ends of cylinder body respectively, tensioning rod and chassis connecting rod form oiling chamber (13) with the through-hole inner wall, it has hydraulic oil to fill in the oiling chamber, tensioning rod (3) its cylinder body outer part and tensioning frame (4) sliding connection, the tip of cylinder body (1) and chassis connecting rod (2) homonymy is equipped with flange (15), spring (6) one end roof pressure is on flange (15), the other end roof pressure is on the spring tensioning face (17) of tensioning frame, the one end that tensioning rod (3) stretched into the through-hole is equipped with cascaded surface (10), the through-hole tip is equipped with the shoulder hole with cascaded surface (10) adaptation, the tip that chassis connecting rod (2) are located cylinder body (1) outward is equipped with oiling mouth (12), oiling mouth communicates the oiling chamber through oiling hole (11) of chassis connecting rod inside, oiling mouth (12) are equipped with oiling valve (14).

3. The track tensioner of claim 2, wherein: the spring tensioning surface (17) is provided with an annular protrusion (16), the spring is sleeved on the annular protrusion, and the end part of the spring is pressed against the spring tensioning surface (17).

4. The track tensioner as claimed in claim 3, wherein the tension adjusting unit comprises: and the flange (15) and/or the spring tension surface (17) are/is provided with an annular groove (19), and the annular groove (19) is respectively matched with the pressure sensor and the oil-filled adjusting ring in shape.

5. The track tensioner as claimed in claim 4, wherein the tension adjusting unit comprises: tensioning rod (3) pass the connecting hole and the tensioning frame sliding fit of tensioning frame (4), and the tip of tensioning rod (3) is equipped with the screw thread, and stop nut (9) are installed on tensioning rod (3) through the screw thread, be equipped with in the connecting hole rather than interference fit's slide bearing (18).

6. The track tensioner as claimed in claim 5, wherein the tension adjusting unit comprises: two ends of the through hole are respectively provided with two sealing grooves, a dust ring (20) and an O-shaped sealing ring (21) are arranged in the two sealing grooves at each end, and the dust ring (20) is arranged close to the end face of the through hole.

7. The track tensioner of claim 6, wherein: the oil filling valve (14) and/or the oil filling valve are/is a one-way valve.