Hydraulic cylinder capable of stopping at any position

Abstract

The utility model provides a hydraulic cylinder capable of stopping at any position, which relates to the field of hydraulic cylinders and comprises a cylinder body, a guide sleeve, a cylinder bottom and a piston component. The first end of the cylinder body is tightly connected with the guide sleeve, the second end of the cylinder body is tightly connected with the cylinder bottom, and a piston in the piston assembly is arranged in the cylinder body. A rod cavity oil passing pipeline is arranged on the side wall of the guide sleeve, the first end of the rod cavity oil passing pipeline is located on the side wall of the guide sleeve, and the second end of the rod cavity oil passing pipeline faces the interior of the cylinder body after the cylinder body is connected with the guide sleeve. A piston rod connector for a piston rod of the piston assembly to penetrate through is formed in the middle of the guide sleeve. The piston is locked through the follow-up stop device, and compared with an original structure, the follow-up stop device has the advantages of being large in locking force, suitable for thick-wall and super-thick-wall cylinder body structures, easy to machine and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder which can stop at any position. Background Art

[0002] A hydraulic cylinder is a device that uses hydraulic transmission to produce linear motion. It usually consists of a piston, a piston rod, seals and a housing. The working principle of a hydraulic cylinder is to use hydraulic oil to apply pressure on both sides of the piston, thereby pushing the piston and piston rod to perform linear motion.

[0003] Hydraulic cylinders are widely used in industrial and mechanical equipment, and common uses include automation equipment on factory production lines, agricultural machinery, construction machinery, ships, aerospace, etc. They can withstand high pressure and large loads, and have the advantages of smooth movement, precise control and high efficiency, so they are widely used in modern engineering.

[0004] However, existing hydraulic cylinders generally cannot stop at any position. If the hydraulic cylinder cannot stop accurately at a specified position under some special application conditions, it may cause poor assembly of parts or damage to mechanical components. Summary of the invention

[0005] In view of the problems existing in the prior art, the utility model provides a hydraulic cylinder which can stop at any position, and the stopping of the piston at any position is achieved by squeezing the expansion sleeve and the inner wall of the cylinder body.

[0006] The utility model discloses a hydraulic cylinder capable of stopping at any position, comprising a cylinder body, a guide sleeve, a cylinder bottom and a piston assembly; the first end of the cylinder body is tightly connected to the guide sleeve, and the second end of the cylinder body is tightly connected to the cylinder bottom; a rod chamber oil passage is provided on the side wall of the guide sleeve, the first end of the rod chamber oil passage is located on the side wall of the guide sleeve, and the second end of the rod chamber oil passage is located inside the cylinder body after the cylinder body and the guide sleeve are connected; a piston rod connecting port is provided in the middle of the guide sleeve for the piston rod of the piston assembly to pass through; a rodless chamber oil passage is provided on the side wall of the cylinder bottom, the first end of the rodless chamber oil passage is located on the side wall of the cylinder bottom, and the The second end is located inside the cylinder body after the cylinder body is connected to the cylinder bottom; a displacement sensor is arranged at the center position of the cylinder bottom; the piston assembly includes a piston rod, a piston, a baffle and a stop device, the piston is arranged inside the cylinder body, the first end of the piston is connected to the first end of the piston rod, the second end of the piston rod is arranged on the outside of the guide sleeve, the second end of the piston is fixedly connected to the baffle, a U-shaped groove is arranged between the piston and the baffle, and the stop device is arranged inside the U-shaped groove; the stop device includes an expansion sleeve and an expansion oil chamber, the expansion sleeve is connected to the end of the U-shaped groove, and the expansion oil chamber is arranged in the closed space formed by the U-shaped groove and the expansion sleeve.

[0007] Preferably, the receiving end of the displacement sensor passes through the cylinder bottom and extends to the inside of the piston and the piston rod; the piston and the piston rod are both provided with a displacement sensor hole for the receiving end of the displacement sensor to penetrate, and a sensor magnetic ring is arranged inside the displacement sensor hole.

[0008] Preferably, the piston and the piston rod are an integrally formed structure.

[0009] Preferably, an oil passage is provided at the second end of the piston rod, a first end of the oil passage is located at the second end of the piston rod, and a second end of the oil passage passes through the piston rod and the piston and then communicates with the expansion oil chamber.

[0010] Preferably, the guide sleeve and the cylinder body, the cylinder bottom and the cylinder body, and the baffle and the piston are all fixedly connected by fastening bolts.

[0011] Preferably, sealing rings are respectively provided on the side wall of the piston rod connection port, the connection between the guide sleeve and the cylinder body, the connection between the cylinder bottom and the cylinder body, the contact point between the piston and the inner wall of the cylinder body, and the contact point between the baffle and the inner wall of the cylinder body.

[0012] Preferably, the expansion sleeve is an expansion copper alloy sleeve.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The utility model provides a stop device in the piston assembly, so that the piston delivers hydraulic oil through the oil passage during movement, thereby causing the expansion oil chamber to begin to expand, causing the expansion oil chamber to squeeze the expansion sleeve, thereby achieving the expansion sleeve squeezing the inside of the cylinder body, and finally achieving the stopping of the piston in the cylinder body, thereby enhancing the flexibility and safety of equipment operation.

[0015] The expansion sleeve of the utility model is made of copper alloy material, and after expansion, it can gradually return to its original state after the hydraulic oil is withdrawn, and will not squeeze the inner wall of the cylinder when no hydraulic oil enters, thereby ensuring that the piston can be used normally under normal circumstances and after expansion.

[0016] The utility model is provided with a displacement sensor receiving end inside the piston assembly, which can detect the moving position of the piston at any time, thereby controlling the stop position of the piston.

[0017] The arrangement of the stop-and-go device in the utility model enables the device to have the advantages of large locking force, being suitable for thick-walled and ultra-thick-walled cylinder structures, and being easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the overall structure of a hydraulic cylinder capable of stopping at any position according to the utility model;

[0019] Figure 2 This is an axial cross-sectional view of a hydraulic cylinder capable of stopping at any position according to the utility model;

[0020] Figure 3 This is a left view of a hydraulic cylinder capable of stopping at any position according to the utility model;

[0021] Figure 4 It is a right side view of a hydraulic cylinder capable of stopping at any position according to the utility model.

[0022] Main reference numerals:

[0023] 1. Oil passage; 2. Oil pipeline for rod chamber; 3. First sealing ring; 4. Displacement sensor hole; 5. Second sealing ring; 6. U-shaped groove; 7. Expansion oil chamber; 8. Third sealing ring; 9. Fourth sealing ring; 10. Oil pipeline for rodless chamber; 11. Displacement sensor; 12. Cylinder bottom; 13. First fastening bolt; 14. Sensor magnetic ring; 15. Second fastening bolt; 16. Expansion copper alloy sleeve; 17. Cylinder body; 18. Third fastening bolt; 19. Fifth sealing ring; 20. Piston assembly; 21. Baffle; 22. Guide sleeve; 23. Mounting screw hole. DETAILED DESCRIPTION

[0024] In order to fully describe the technical content, structural features, objectives and effects of the present invention, the following will be described in detail with reference to the accompanying drawings.

[0025] The utility model discloses a hydraulic cylinder which can stop at any position, such as Figure 1-Figure 4 As shown, it includes a cylinder body 17, a guide sleeve 22, a cylinder bottom 12 and a piston assembly 20; the first end of the cylinder body 17 is tightly connected with the guide sleeve 22, the second end of the cylinder body 17 is tightly connected with the cylinder bottom 12, and the piston in the piston assembly 20 is arranged inside the cylinder body 17.

[0026] A rod chamber oil pipeline 2 is provided on the side wall of the guide sleeve 22, and the first end of the rod chamber oil pipeline 2 is located on the side wall of the guide sleeve 22, and the second end of the rod chamber oil pipeline 2 faces the interior of the cylinder body 17 after the cylinder body 17 is connected to the guide sleeve 22; a piston rod connecting port is provided in the middle of the guide sleeve 22 for the piston rod of the piston assembly 20 to pass through, and a plurality of mounting screw holes 23 for connecting to other devices are also provided on the guide sleeve 22.

[0027] A rodless oil passage 10 is provided on the side wall of the cylinder bottom 12, the first end of the rodless oil passage 10 is on the side wall of the cylinder bottom 12, and the second end of the rodless oil passage 10 faces the inside of the cylinder body 17 after the cylinder body 17 is connected to the cylinder bottom 12; a displacement sensor 11 is provided at the center position of the cylinder bottom 12.

[0028] The piston assembly 20 includes a piston rod, a piston, a baffle 21 and a stop device. The piston is arranged inside the cylinder body 17. The first end of the piston is connected to the first end of the piston rod. The second end of the piston rod is arranged on the outside of the guide sleeve 22. The second end of the piston is fixedly connected to the baffle 21. A U-shaped groove 6 is arranged between the piston and the baffle 21, and the stop device is arranged inside the U-shaped groove 6.

[0029] The stop device includes an expansion copper alloy sleeve 16 and an expansion oil chamber 7 . The expansion copper alloy sleeve 16 is connected to the end of the U-shaped groove 6 , and the expansion oil chamber 7 is arranged in a closed space formed by the U-shaped groove 6 and the expansion copper alloy sleeve 16 .

[0030] The receiving end of the displacement sensor 11 passes through the cylinder bottom 12 and extends to the inside of the piston and the piston rod; the piston and the piston rod are both provided with a displacement sensor hole 4 for the receiving end of the displacement sensor 11 to penetrate, and the displacement sensor hole 4 is provided with a sensor magnetic ring 14.

[0031] The piston and the piston rod are an integrally formed structure.

[0032] An oil passage 1 is provided on the second end of the piston rod, a first end of the oil passage 1 is located on the second end of the piston rod, and a second end of the oil passage 1 passes through the piston rod and the piston and is communicated with the expansion oil chamber 7.

[0033] The guide sleeve 22 and the cylinder body 17 are fixedly connected via a third fastening bolt 18 .

[0034] The cylinder bottom 12 and the cylinder body 17 are fixedly connected by a second fastening bolt 15 .

[0035] The baffle 21 and the piston are fixedly connected via a second fastening bolt 15 .

[0036] A first sealing ring 3 is provided at the connection between the guide sleeve 22 and the cylinder body 17 .

[0037] A second sealing ring 5 is provided at the contact point between the piston and the inner wall of the cylinder body 17 .

[0038] A third sealing ring 8 is provided at the contact point between the baffle 21 and the inner wall of the cylinder body 17 .

[0039] A fourth sealing ring 9 is provided at the connection between the cylinder bottom 12 and the cylinder body 17 .

[0040] A fifth sealing ring 19 is provided on the side wall of the piston rod connection port.

[0041] To further enhance the strength of the inner hole of the cylinder body 17, hard chrome plating is used for enhancement; to enhance the pressure-maintaining performance, the expanded copper alloy sleeve 16 is fastened to the piston assembly 20 and the baffle 21 using the first fastening bolts 13 and then connected by welding.

[0042] The working principle of the utility model is as follows:

[0043] In the use state, when the oil cylinder is in normal operation, the second sealing ring 5 and the third sealing ring 8 at the piston position seal the rod chamber and the rodless chamber respectively, and the sealing realizes the closure of the rod chamber and the rodless chamber. When locking is required, the pressure oil is transferred to the expansion oil chamber 7 through the oil passage 1 on the piston assembly 20, and the expansion copper alloy sleeve 16 expands and deforms under the action of the pressure oil, and realizes hard contact with the inner wall of the cylinder body 17, thereby realizing the locking of the piston rod at any position; the displacement sensor 11 monitors the position of the piston in the piston assembly 20, and in the locked state, the pressure oil in the rod chamber or the rodless chamber is cut off through the external valve block. When unlocking is required, the pressure oil is unloaded, the copper alloy expansion sleeve is depressurized, and the rod chamber and the rodless chamber of the hydraulic cylinder are passed through the respective rod chamber oil pipeline 2 and the rodless chamber oil pipeline 10. Hydraulic oil is passed, thereby realizing the movement of the piston.

[0044] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A hydraulic cylinder capable of stopping at any position, characterized in that: It includes a cylinder body, a guide sleeve, a cylinder bottom and a piston assembly; The first end of the cylinder body is tightly connected to the guide sleeve, and the second end of the cylinder body is tightly connected to the cylinder bottom; A rod chamber oil passage is provided on the side wall of the guide sleeve, a first end of the rod chamber oil passage is located on the side wall of the guide sleeve, and a second end of the rod chamber oil passage is located inside the cylinder body after the cylinder body and the guide sleeve are connected; a piston rod connection port is provided in the middle of the guide sleeve for the piston rod of the piston assembly to pass through; A rodless cavity oil passage is provided on the side wall of the cylinder bottom, a first end of the rodless cavity oil passage is located on the side wall of the cylinder bottom, and a second end of the rodless cavity oil passage is located inside the cylinder body after the cylinder body is connected to the cylinder bottom; a displacement sensor is provided at the center of the cylinder bottom; The piston assembly comprises a piston rod, a piston, a baffle and a stop device, wherein the piston is arranged inside the cylinder body, the first end of the piston is connected to the first end of the piston rod, the second end of the piston rod is arranged outside the guide sleeve, the second end of the piston is fixedly connected to the baffle, a U-shaped groove is arranged between the piston and the baffle, and the stop device is arranged inside the U-shaped groove; The stop-and-go device comprises an expansion sleeve and an expansion oil chamber, wherein the expansion sleeve is connected to the end of the U-shaped groove, and the expansion oil chamber is arranged in a closed space formed by the U-shaped groove and the expansion sleeve.

2. The hydraulic cylinder capable of stopping at any position according to claim 1, characterized in that: The receiving end of the displacement sensor passes through the cylinder bottom and extends to the inside of the piston and the piston rod; the piston and the piston rod are both provided with a displacement sensor hole for the receiving end of the displacement sensor to penetrate, and a sensor magnetic ring is arranged inside the displacement sensor hole.

3. The hydraulic cylinder capable of stopping at any position according to claim 1, characterized in that: The piston and the piston rod are an integrally formed structure.

4. The hydraulic cylinder capable of stopping at any position according to claim 1, characterized in that: The second end of the piston rod is provided with an oil passage, the first end of the oil passage is located at the second end of the piston rod, and the second end of the oil passage passes through the piston rod and the piston and is communicated with the expansion oil chamber.

5. The hydraulic cylinder capable of stopping at any position according to claim 1, characterized in that: The guide sleeve and the cylinder body, the cylinder bottom and the cylinder body, and the baffle and the piston are all fixedly connected by fastening bolts.

6. The hydraulic cylinder capable of stopping at any position according to claim 1, characterized in that: Sealing rings are respectively arranged on the side wall of the piston rod connection port, the connection between the guide sleeve and the cylinder body, the connection between the cylinder bottom and the cylinder body, the contact between the piston and the inner wall of the cylinder, and the contact between the baffle and the inner wall of the cylinder.

7. The hydraulic cylinder capable of stopping at any position according to claim 1, characterized in that: The expansion sleeve is an expansion copper alloy sleeve.

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