Double-acting two-stage cylinder

Abstract

The utility model relates to a double-acting two-stage cylinder, and belongs to the field of two-stage cylinders, the double-acting two-stage cylinder comprises an outer cylinder body, an inner cylinder body and a cylinder tail, the inner cylinder body is slidably connected in the outer cylinder body, the cylinder tail is arranged on the outer cylinder body, a piston block is slidably connected in the inner cylinder body, a piston rod is coaxially arranged on the piston block, a compensation plate is arranged in the inner cylinder body, and a piston rod is coaxially arranged on the piston rod. One side of the compensation plate is connected with the piston block, and the other side of the compensation plate abuts against the cylinder tail. And the compensation plate can conveniently compensate the moving distance of the inner cylinder body, so that the starting threshold value of the piston rod can adapt to different working conditions, and the application range of the two-stage cylinder is widened.

Description

Technical Field

[0001] The present application relates to the field of two-stage cylinders, and in particular to a double-acting two-stage cylinder. Background Art

[0002] Double-acting two-stage cylinders are mainly suitable for pushing a large load to a specified position first, and then pushing a small load to a specified end. When retracting, the small load retracts first, followed by the large load.

[0003] The double-acting two-stage cylinder mainly includes a cylinder barrel, a primary piston rod and a secondary piston rod. The primary piston rod is slidably connected in the cylinder barrel. The primary piston rod is provided with a connecting hole connected to the cylinder barrel, and the secondary piston rod is slidably connected in the connecting hole. The cylinder barrel is provided with a first oil inlet hole and a second oil inlet hole. External liquid enters the cylinder barrel from the first oil inlet hole. The liquid provides power to the primary piston rod, so that the primary piston rod extends out of the cylinder barrel. After the primary piston rod moves to the set position, the liquid entering the connecting hole provides power to the secondary piston rod, so that the secondary piston rod moves, so as to move the secondary piston rod to the set position.

[0004] In actual use, the secondary piston rod needs to be started after the primary piston rod moves to the set position, which makes the application range of the double-acting two-stage cylinder smaller, so it needs to be improved. Utility Model Content

[0005] In order to improve the above problems, the present application provides a double-acting two-stage cylinder.

[0006] The present application provides a double-acting two-stage cylinder, which adopts the following technical solution:

[0007] A double-acting two-stage cylinder comprises an outer cylinder body, an inner cylinder body and a cylinder tail, wherein the inner cylinder body is slidably connected in the outer cylinder body, the cylinder tail is arranged on the outer cylinder body, a piston block is slidably connected in the inner cylinder body, a piston rod is coaxially arranged on the piston block, a compensation plate is arranged in the inner cylinder body, one side of the compensation plate is connected to the piston block, and the other side abuts against the cylinder tail.

[0008] By adopting the above technical solution, when the two-stage cylinder needs to be used, the worker selects compensation plates of different sizes according to the working conditions, and then inserts the compensation plates into the inner cylinder body so that the compensation plates and the piston block are fixed. At this time, the compensation plates compensate for part of the movement distance of the inner cylinder body, so that the two-stage cylinder can reach the triggering threshold of the piston rod faster, making the two-stage cylinder adaptable to different working conditions, that is, improving the application range of the two-stage cylinder.

[0009] Preferably, the compensation plate is connected to the piston block by bolts.

[0010] By adopting the above technical solution, when the two-stage cylinder needs to adapt to different working conditions, the workers select compensation plates of different sizes, and then insert the compensation plates into the inner cylinder body, and then use bolts to fix the compensation plates and the piston block to complete the fixation between the compensation plates and the piston block, which provides convenience for the subsequent compensation plates to compensate for the moving distance of the inner cylinder body, and also provides convenience for the installation of the compensation plates.

[0011] Preferably, the outer cylinder body is provided with a first liquid inlet hole and a second liquid inlet hole, the first liquid inlet hole is connected with the inner cylinder body, the inner wall of the outer cylinder body is provided with a liquid inlet groove connected with the second liquid inlet hole, a first liquid inlet cavity is formed between the inner wall of the liquid inlet groove and the inner cylinder body, a second liquid inlet cavity is provided in the inner cylinder body, a through hole for connecting the first liquid inlet cavity and the second liquid inlet cavity is provided on the inner cylinder body, and a third liquid inlet hole connected with the second liquid inlet cavity is provided on the inner wall of the inner cylinder body.

[0012] By adopting the above technical solution, when it is necessary to control the inner cylinder body and the piston rod to extend, the external liquid enters the outer cylinder body from the first liquid inlet hole, and the liquid first provides assistance to the inner cylinder body, so that the inner cylinder body and the piston rod move synchronously. After the inner cylinder body moves to the set position, the liquid then provides assistance to the compensation plate and the piston rod to push the piston rod. When it is necessary to control the recovery of the inner cylinder body and the piston rod, the external liquid enters the first liquid inlet cavity from the second liquid inlet hole, and the external liquid enters the second liquid inlet cavity from the through hole. The external liquid then enters the inner cylinder body from the third liquid inlet hole to control the reset of the inner cylinder body and the piston rod, thereby providing convenience for the use of the two-stage cylinder.

[0013] Preferably, the axis of the third liquid inlet hole intersects with the axis of the piston rod.

[0014] By adopting the above technical solution, since the axis of the third liquid inlet hole intersects with the axis of the piston rod, that is, the third liquid inlet hole is opened at an angle, the external liquid can enter the inner cylinder body more stably and provide thrust to the piston block, thereby facilitating the stable operation of the two-stage cylinder.

[0015] Preferably, a plurality of first sealing rings are provided on the piston rod, and each of the first sealing rings abuts against the piston block.

[0016] By adopting the above technical solution, the first sealing ring increases the sealing performance between the piston rod and the piston block, and reduces the leakage of the liquid entering from the first liquid inlet hole at the connection between the piston rod and the piston block.

[0017] Preferably, dust rings are embedded in the inner wall of the inner cylinder body and the inner wall of the outer cylinder body, the dust ring corresponding to the outer cylinder body abuts against the outer wall of the inner cylinder body, and the dust ring corresponding to the inner cylinder body abuts against the piston rod.

[0018] By adopting the above technical solution, the dustproof ring makes it difficult for external impurities to enter the outer cylinder body and the inner cylinder body, so that the inner cylinder body and the piston rod can work more stably.

[0019] Preferably, the inner wall of the outer cylinder body and the inner wall of the inner cylinder body are both embedded with second sealing rings, the second sealing ring corresponding to the outer cylinder body abuts against the outer wall of the inner cylinder body, and the second sealing ring corresponding to the inner cylinder body abuts against the piston rod.

[0020] By adopting the above technical solution, the second sealing ring corresponding to the outer cylinder body increases the sealing between the outer cylinder body and the inner cylinder body, and the second sealing ring corresponding to the inner cylinder body increases the sealing between the inner cylinder body and the piston stem, reducing the phenomenon of liquid leakage between the inner cylinder body and the outer cylinder body, thereby further improving the stability of the two-stage cylinder during operation.

[0021] Preferably, a plurality of third sealing rings are embedded on the cylinder tail, and each of the third sealing rings abuts against the inner wall of the outer cylinder body.

[0022] By adopting the above technical solution, the third sealing ring increases the sealing between the cylinder tail and the outer cylinder body, reduces the possibility of liquid from the first liquid inlet hole leaking from the connection between the cylinder tail and the outer cylinder body, thereby further improving the stability of the two-stage cylinder during use.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. By setting a compensation plate, the compensation plate compensates for the moving distance of the inner cylinder body, so that the trigger threshold of the piston rod in the two-stage cylinder is adapted to different working conditions, thereby improving the application range of the two-stage cylinder;

[0025] 2. By setting the third liquid inlet hole which is inclined, the external liquid can enter the inner cylinder body more stably and provide thrust to the piston block, thus facilitating the stable operation of the two-stage cylinder;

[0026] 3. By setting the dustproof ring, the dustproof ring makes it difficult for foreign impurities to enter the outer cylinder body and the inner cylinder body, so that the inner cylinder body and the piston rod can work more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0028] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0029] Explanation of the accompanying drawings: 1. Outer cylinder body; 11. First liquid inlet hole; 12. Second liquid inlet hole; 13. Liquid inlet groove; 14. Oil pipe; 15. First liquid inlet chamber; 2. Inner cylinder body; 21. Second liquid inlet chamber; 22. Through hole; 23. Third liquid inlet hole; 3. Cylinder tail; 31. Third sealing ring; 4. Piston block; 5. Piston rod; 51. First sealing ring; 6. Compensation plate; 7. Dust ring; 8. Step seal; 9. Second sealing ring. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 This application is described in further detail.

[0031] The present application embodiment discloses a double-acting two-stage cylinder. Figure 1 A double-acting two-stage cylinder comprises an outer cylinder body 1, an inner cylinder body 2 and a cylinder tail 3, wherein the inner cylinder body 2 is slidably connected in the outer cylinder body 1, and the cylinder tail 3 is fixed on the outer cylinder body 1. A piston block 4 is slidably connected in the inner cylinder body 2, a piston rod 5 is coaxially fixed on the piston block 4, and a compensation plate 6 is arranged in the inner cylinder body 2, one side of the compensation plate 6 is connected to the piston block 4, and the other side abuts against the cylinder tail 3.

[0032] When the two-stage cylinder is needed, the worker selects compensation plates 6 of different sizes according to the use requirements of the two-stage cylinder, and then puts the compensation plate 6 into the inner cylinder body 2 so that the compensation plate 6 is connected to the piston block 4. In the subsequent use of the double-click cylinder, the compensation plate 6 compensates for part of the movement distance of the inner cylinder body 2, so that the double-click cylinder can reach the triggering threshold of the piston rod 5 more quickly, so that the double-click cylinder is adapted to different working conditions, thereby improving the application range of the two-stage cylinder.

[0033] Reference Figure 1 In order to facilitate the installation of the compensation plate 6, the compensation plate 6 is fixed to the piston block 4 by bolts. The bolts make the compensation plate 6 and the piston block 4 detachably connected, which provides convenience for workers to install and remove the compensation plate 6.

[0034] Reference Figure 1 and Figure 2 The outer cylinder body 1 is provided with a first liquid inlet hole 11 and a second liquid inlet hole 12, the first liquid inlet hole 11 is connected to the inner cylinder body 2, and the inner wall of the outer cylinder body 1 is provided with a liquid inlet groove 13 connected to the second liquid inlet hole 12. The outer cylinder body 1 is provided with an oil pipe 14, and the oil pipe 14 is connected to the second liquid inlet hole 12. A first liquid inlet cavity 15 is formed between the inner wall of the liquid inlet groove 13 and the inner cylinder body 2, a second liquid inlet cavity 21 is provided in the inner cylinder body 2, and a through hole 22 for connecting the first liquid inlet cavity 15 and the second liquid inlet cavity 21 is provided on the inner cylinder body 2. A third liquid inlet hole 23 connected to the second liquid inlet cavity 21 is provided on the inner wall of the inner cylinder body 2.

[0035] When it is necessary to control the inner cylinder body 2 and the piston rod 5 to extend, the external liquid enters the outer cylinder body 1 from the first liquid inlet hole 11, and the liquid first provides assistance to the inner cylinder body 2, so that the inner cylinder body 2 and the piston rod 5 move synchronously. After the inner cylinder body 2 moves to the set position, the liquid provides assistance to the compensation plate 6 and the piston rod 5 to push the piston rod 5. When it is necessary to control the retraction of the inner cylinder body 2 and the piston rod 5, the external liquid enters the first liquid inlet cavity 15 from the second liquid inlet hole 12, and the external liquid enters the second liquid inlet cavity 21 from the through hole 22. The external liquid then enters the inner cylinder body 2 from the third liquid inlet hole 23 to control the reset of the inner cylinder body 2 and the piston rod 5, thereby providing convenience for the use of the two-stage cylinder.

[0036] Reference Figure 1 and Figure 2 The axis of the third liquid inlet hole 23 intersects with the axis of the piston rod 5, that is, the third liquid inlet hole 23 is inclined. At this time, the inclined third liquid inlet hole 23 facilitates the external liquid to enter the inner cylinder body 2 more stably and provide power to the piston block 4, thereby facilitating the stable operation of the two-stage cylinder.

[0037] Reference Figure 1 A plurality of first sealing rings 51 are fixed on the piston rod 5, and each of the first sealing rings 51 abuts against the piston block 4. The first sealing rings 51 increase the sealing performance between the piston rod 5 and the piston block 4, and reduce the leakage of the liquid entering from the first liquid inlet hole 11 at the connection between the piston rod 5 and the piston block 4.

[0038] Reference Figure 1 The inner wall of the inner cylinder 2 and the inner wall of the outer cylinder 1 are both embedded with dust rings 7, the dust ring 7 corresponding to the outer cylinder 1 abuts against the outer wall of the inner cylinder 2, and the dust ring 7 corresponding to the inner cylinder 2 abuts against the piston rod 5. The dust ring 7 makes it difficult for foreign matter to enter the outer cylinder 1 and the inner cylinder 2, so that the inner cylinder 2 and the piston rod 5 move more stably, that is, the stability of the two-stage cylinder when in use is improved.

[0039] Reference Figure 1 The inner wall of the inner cylinder 2 and the inner wall of the outer cylinder 1 are both embedded with step seals 8, and the step seal 8 corresponding to the outer cylinder 1 abuts against the outer wall of the inner cylinder 2, and the step seal 8 corresponding to the inner cylinder 2 abuts against the piston rod 5. The inner wall of the outer cylinder 1 and the inner wall of the inner cylinder 2 are both embedded with second sealing rings 9, and the second sealing ring 9 corresponding to the outer cylinder 1 abuts against the outer wall of the inner cylinder 2, and the second sealing ring 9 corresponding to the inner cylinder 2 abuts against the piston rod 5.

[0040] The step seal 8 corresponding to the outer cylinder body 1 cooperates with the second sealing ring 9 to improve the sealing between the outer cylinder body 1 and the inner cylinder body 2. The step seal 8 corresponding to the inner cylinder body 2 cooperates with the second sealing ring 9 to improve the sealing between the inner cylinder body 2 and the piston rod 5, making it less likely for the double-click cylinder to leak, so that the double-click cylinder can work more stably.

[0041] Reference Figure 1 A plurality of third sealing rings 31 are embedded on the cylinder tail 3, and each third sealing ring 31 abuts against the inner wall of the outer cylinder body 1. The first sealing ring 51, the second sealing ring 9 and the third sealing ring 31 are all made of silicone, which has good waterproof performance to improve the sealing between the outer cylinder body 1 and the inner cylinder body 2 and the sealing between the inner cylinder body 2 and the piston rod 5.

[0042] The third sealing ring 31 increases the sealing between the cylinder tail 3 and the outer cylinder body 1, reducing the possibility of liquid from the first liquid inlet hole 11 leaking from the connection between the cylinder tail 3 and the outer cylinder body 1, thereby further improving the stability of the two-stage cylinder when in use.

[0043] The implementation principle of a double-acting two-stage cylinder in an embodiment of the present application is as follows: when a double-acting cylinder is needed, the worker selects compensation plates 6 of different sizes according to usage requirements. The compensation plates 6 compensate for the movement distance of part of the inner cylinder body 2, so that the two-stage cylinder can reach the triggering threshold of the piston rod 5 in the two-stage cylinder more quickly, and at the same time make the two-stage cylinder adapt to different working conditions, thereby improving the applicability of the two-stage cylinder.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double-acting two-stage cylinder, characterized in that: The invention comprises an outer cylinder body (1), an inner cylinder body (2) and a cylinder tail (3), wherein the inner cylinder body (2) is slidably connected to the outer cylinder body (1), the cylinder tail (3) is arranged on the outer cylinder body (1), a piston block (4) is slidably connected to the inner cylinder body (2), a piston rod (5) is coaxially arranged on the piston block (4), and a compensation plate (6) is arranged in the inner cylinder body (2), one side of the compensation plate (6) is connected to the piston block (4), and the other side is in contact with the cylinder tail (3).

2. A double-acting two-stage cylinder according to claim 1, characterized in that: The compensation plate (6) is connected to the piston block (4) via bolts.

3. A double-acting two-stage cylinder according to claim 1, characterized in that: The outer cylinder body (1) is provided with a first liquid inlet hole (11) and a second liquid inlet hole (12); the first liquid inlet hole (11) is connected to the inner cylinder body (2); the inner wall of the outer cylinder body (1) is provided with a liquid inlet groove (13) connected to the second liquid inlet hole (12); a first liquid inlet cavity (15) is formed between the inner wall of the liquid inlet groove (13) and the inner cylinder body (2); a second liquid inlet cavity (21) is provided in the inner cylinder body (2); a through hole (22) for connecting the first liquid inlet cavity (15) and the second liquid inlet cavity (21) is provided on the inner cylinder body (2); and a third liquid inlet hole (23) connected to the second liquid inlet cavity (21) is provided on the inner wall of the inner cylinder body (2).

4. A double-acting two-stage cylinder according to claim 3, characterized in that: The axis of the third liquid inlet hole (23) intersects with the axis of the piston rod (5).

5. A double-acting two-stage cylinder according to claim 1, characterized in that: A plurality of first sealing rings (51) are provided on the piston rod (5), and each of the first sealing rings (51) is in contact with the piston block (4).

6. A double-acting two-stage cylinder according to claim 1, characterized in that: The inner wall of the inner cylinder body (2) and the inner wall of the outer cylinder body (1) are both embedded with dust rings (7); the dust ring (7) corresponding to the outer cylinder body (1) abuts against the outer wall of the inner cylinder body (2); and the dust ring (7) corresponding to the inner cylinder body (2) abuts against the piston rod (5).

7. A double-acting two-stage cylinder according to claim 6, characterized in that: The inner wall of the outer cylinder body (1) and the inner wall of the inner cylinder body (2) are both embedded with a second sealing ring (9); the second sealing ring (9) corresponding to the outer cylinder body (1) abuts against the outer wall of the inner cylinder body (2), and the second sealing ring (9) corresponding to the inner cylinder body (2) abuts against the piston rod (5).

8. A double-acting two-stage cylinder according to claim 1, characterized in that: A plurality of third sealing rings (31) are embedded on the cylinder tail (3), and each of the third sealing rings (31) is in contact with the inner wall of the outer cylinder body (1).

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