Hydraulic cylinder with built-in overflow valve

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with a built-in overflow valve, which is provided with an adjustable overflow valve structure and can be used for oil backflow, overload prevention and practicability improvement by setting a limit according to requirements. Comprising an outer cylinder body, an oil inlet pipe, an oil cavity, an oil return pipe, an on-off valve, a piston, a telescopic rod, an overflow valve internal thread shell, a spring, a plug body, a limiting adjusting screw rod, a screwing handle and a middle pipe, the oil inlet pipe and the oil return pipe are arranged on the outer side of the outer cylinder body, the on-off valve is arranged on the oil return pipe, and the bottom end of the interior of the outer cylinder body is connected with the bottom end of the oil cavity; the input end of the oil cavity is communicated with the inner side of the oil inlet pipe, the output end of the oil cavity is communicated with the inner side of the oil return pipe, the output end of the overflow valve internal thread shell is communicated with one side of the oil return pipe through a middle pipe, the inner wall of the overflow valve internal thread shell is in threaded connection with the outer wall of the limiting adjusting screw, and the outer side of the limiting adjusting screw is connected with the middle of the inner side of the screwing handle. The left side in the overflow valve internal thread shell is connected with the left side of the plug body through the spring.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with a built-in overflow valve. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is smooth, so it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The buffer device and the exhaust device depend on the specific application, and other devices are indispensable.

[0003] There is a hydraulic cylinder mechanism with patent announcement number CN204851839U, which places the oil hole at the outer end of the piston rod, fixes the piston rod by bolts, and the hydraulic cylinder body reciprocates. In this way, the surface of the hydraulic cylinder body is smooth, and the hydraulic cylinder can be installed in any possible place, making the application of the hydraulic cylinder more extensive. The utility model has high working pressure, strong stability, high strength, and the cylinder body is specially treated to increase the service life.

[0004] Another example is a hydraulic cylinder mechanism with patent number CN205446267U, which provides a buffer groove connected to the medium interface on the cylinder head and a buffer protrusion on the piston, so that when the piston approaches the cylinder head, part of the hydraulic medium will be sealed between the buffer groove and the buffer protrusion, and this part of the hydraulic medium can flow back into the medium interface through the buffer channel. However, since the aperture of the buffer hole is much smaller than the medium interface, the sealed hydraulic medium can produce a larger buffering resistance to the piston, avoiding the collision between the piston and the cylinder head, reducing the probability of damage to the piston and the cylinder head, and extending the service life of the hydraulic cylinder mechanism.

[0005] However, this type of device cannot limit the hydraulic pressure output by the external hydraulic mechanism and is not practical enough. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the utility model provides a hydraulic cylinder with a built-in overflow valve, which is provided with an adjustable overflow valve structure and can set a limit according to demand for oil reflux to avoid overload and improve practicality.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a hydraulic cylinder with a built-in overflow valve, comprising an outer cylinder body, an oil inlet pipe, an oil chamber, an oil return pipe, an opening and closing valve, a piston, a telescopic rod, an overflow valve internal threaded housing, a spring, a plug body, a limit adjustment screw, a twist handle and an intermediate pipe, an oil inlet pipe and an oil return pipe are arranged on the outer side of the outer cylinder body, an opening and closing valve is arranged on the oil return pipe, the bottom end of the inner part of the outer cylinder body is connected with the bottom end of the oil chamber, the input end of the oil chamber is connected with the inner side of the oil inlet pipe, the output end of the oil chamber is connected with the inner side of the oil return pipe, the inner side of the oil chamber is slidably connected with the outer side of the piston, the top end of the piston is connected with the bottom end of the telescopic rod, the internal threaded housing of the overflow valve is arranged on one side of the outer end of the outer cylinder body, the output end of the internal threaded housing of the overflow valve is connected with one side of the oil return pipe via the intermediate pipe, the inner wall of the internal threaded housing of the overflow valve is threadedly connected with the outer wall of the limit adjustment screw, the outer side of the limit adjustment screw is connected with the middle part of the inner side of the twist handle, and the left side of the internal threaded housing of the overflow valve is connected with the left side of the plug body via a spring.

[0010] Preferably, it also includes a mounting plate, a circular through groove, a long bolt, a nut, a long mounting groove and a sleeve, wherein the sleeve is connected to the middle of the inner side of the mounting plate, a group of circular through grooves are respectively arranged at the four corner sides inside the mounting plate, and a group of long mounting grooves are respectively arranged in the middle of the front and rear sides of the mounting plate, the long bolts are movably arranged on the inner side of the circular through grooves, and the outer side of the long bolts and the inner side of the nut are detachably screwed.

[0011] Preferably, it further comprises a conical block, and the bottom of the piston is provided with a conical block.

[0012] Preferably, it further comprises a guide sleeve, wherein the inner side of the middle portion of the top end of the outer cylinder body is connected to the outer side of the guide sleeve, and the inner side of the guide sleeve is slidably connected to the outer side of the telescopic rod.

[0013] Preferably, it further comprises an oiling nozzle, wherein one side of the outer end of the guide sleeve is provided with an oiling nozzle, and an output end of the oiling nozzle is connected to the inner side of the guide sleeve.

[0014] Preferably, it also includes an oil filling cap, and the outer side of the oil filling nozzle and the inner side of the oil filling cap are detachably mounted.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a hydraulic cylinder with a built-in overflow valve, which has the following

[0017] Beneficial effects:

[0018] The input end of the oil inlet pipe and the output end of the oil return pipe are respectively installed and connected with the hydraulic mechanism. When in use, the handle can be turned to rotate the limit adjusting screw. The limit adjusting screw is threadedly matched with the inner wall of the internal threaded shell of the relief valve to make it move laterally and stop at the corresponding position. The thread is self-locking to form a limit on the plug body. During operation, oil is fed into the oil inlet pipe, acting on the inner side of the oil chamber and the piston to increase pressure, so that the telescopic rod slides outward, and when the opening and closing valve is opened, oil is discharged from the oil return pipe to retract the telescopic rod. During the process of the telescopic rod sliding outward, the spring can be overcome according to the internal hydraulic pressure to make the plug slide outward, and the oil can be output to the oil return pipe through the intermediate pipe for reflux through the limit adjusting screw to avoid overload. An adjustable relief valve structure is provided, and the limit can be set according to demand for oil reflux to avoid overload and improve practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axial view of the schematic diagram of the structure of the utility model;

[0020] Figure 2 For this utility model Figure 1 Front view of

[0021] Figure 3 For this utility model Figure 1 Right view of;

[0022] Figure 4 For this utility model Figure 1 Top view of .

[0023] Markings in the attached figure: 1. outer cylinder body; 2. oil inlet pipe; 3. oil chamber; 4. oil return pipe; 5. opening and closing valve; 6. piston; 7. telescopic rod; 8. guide sleeve; 9. internal threaded housing of overflow valve; 10. spring; 11. plug body; 12. limit adjustment screw; 13. screw handle; 14. mounting plate; 15. round groove; 16. long bolt; 17. nut; 18. long mounting groove; 19. sleeve frame; 20. tapered block; 21. oil filling nozzle; 22. oil filling cap; 23. intermediate tube. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example 1

[0026] See also Figure 1-4A hydraulic cylinder with a built-in overflow valve comprises an outer cylinder body 1, an oil inlet pipe 2, an oil chamber 3, an oil return pipe 4, an on-off valve 5, a piston 6, a telescopic rod 7, an internal threaded housing 9 of the overflow valve, a spring 10, a plug body 11, a limit adjustment screw 12, a screw handle 13 and an intermediate pipe 23. An oil inlet pipe 2 and an oil return pipe 4 are arranged on the outer side of the outer cylinder body 1, and an on-off valve 5 is arranged on the oil return pipe 4. The bottom end of the inner part of the outer cylinder body 1 is connected to the bottom end of the oil chamber 3, and the input end of the oil chamber 3 is connected to the inlet The inner side of the oil pipe 2 is connected, the output end of the oil chamber 3 is connected to the inner side of the oil return pipe 4, the inner side of the oil chamber 3 is slidably connected to the outer side of the piston 6, the top of the piston 6 is connected to the bottom of the telescopic rod 7, the overflow valve internal thread housing 9 is arranged on one side of the outer end of the outer cylinder body 1, the output end of the overflow valve internal thread housing 9 is connected to one side of the oil return pipe 4 through the intermediate pipe 23, the inner wall of the overflow valve internal thread housing 9 is screwed to the outer wall of the limit adjustment screw 12, and the outer side of the limit adjustment screw 12 It is connected to the middle part of the inner side of the screw handle 13, and the left side of the inner thread shell 9 of the overflow valve is connected to the left side of the plug body 11 through the spring 10; the input end of the oil inlet pipe 2 and the output end of the oil return pipe 4 are respectively installed and connected to the hydraulic mechanism. When in use, the screw handle 13 can be turned to rotate the limit adjustment screw 12. The limit adjustment screw 12 is threadedly matched with the inner wall of the inner thread shell 9 of the overflow valve to make it move laterally and stop at the corresponding position. The thread self-locking forms a limit to the plug body 11. During operation, oil is fed into the oil inlet pipe 2, acting on the inner side of the oil chamber 3, acting on the piston 6 to apply pressure, so that the telescopic rod 7 slides outward, and when the opening and closing valve 5 is opened, oil is discharged from the oil return pipe 4 to retract the telescopic rod 7. During the process of the telescopic rod 7 sliding outward, the spring 10 can be overcome according to the internal hydraulic pressure to make the plug body 11 slide outward, and the limit of the limit adjustment screw 12 is used to output the oil through the intermediate pipe 23 to the return pipe 4 for reflux to avoid overload.

[0027] It also includes a mounting plate 14, a round through groove 15, a long bolt 16, a nut 17, a long mounting groove 18 and a sleeve 19. The sleeve 19 is connected to the middle part of the inner side of the mounting plate 14. A group of round through grooves 15 are respectively arranged at the four corner sides inside the mounting plate 14, and a group of long mounting grooves 18 are respectively arranged in the middle of the front and rear sides of the mounting plate 14. The long bolts 16 are movably arranged on the inner side of the round through grooves 15, and the outer side of the long bolts 16 and the inner side of the nuts 17 are detachably screwed together; the sleeves 19 of the two groups of mounting plates 14 are respectively sleeved on the outer side of the upper and lower sides of the outer cylinder body 1, so that the four groups of round through grooves 15 correspond vertically respectively, and then the four groups of long bolts 16 pass through the two vertical groups of round through grooves 15 respectively, and are screwed and fixed by nuts 17 on the outer side of the long bolts 16, so that the two groups of mounting plates 14 are fixed on the outer side of the outer cylinder body 1, and external installation can be performed through the long mounting grooves 18.

[0028] It also includes a conical block 20, and the bottom of the piston 6 is provided with the conical block 20; a gap at the bottom of the piston 6 can be created through the conical block 20, which can facilitate oil intake and improve practicality.

[0029] Example 2

[0030] See also Figure 1-4 A hydraulic cylinder with a built-in overflow valve comprises an outer cylinder body 1, an oil inlet pipe 2, an oil chamber 3, an oil return pipe 4, an on-off valve 5, a piston 6, a telescopic rod 7, an internal threaded housing 9 of the overflow valve, a spring 10, a plug body 11, a limit adjustment screw 12, a screw handle 13 and an intermediate pipe 23. An oil inlet pipe 2 and an oil return pipe 4 are arranged on the outer side of the outer cylinder body 1, and an on-off valve 5 is arranged on the oil return pipe 4. The bottom end of the inner part of the outer cylinder body 1 is connected to the bottom end of the oil chamber 3, and the input end of the oil chamber 3 is connected to the inlet The inner side of the oil pipe 2 is connected, the output end of the oil chamber 3 is connected to the inner side of the oil return pipe 4, the inner side of the oil chamber 3 is slidably connected to the outer side of the piston 6, the top of the piston 6 is connected to the bottom of the telescopic rod 7, the overflow valve internal thread housing 9 is arranged on one side of the outer end of the outer cylinder body 1, the output end of the overflow valve internal thread housing 9 is connected to one side of the oil return pipe 4 through the intermediate pipe 23, the inner wall of the overflow valve internal thread housing 9 is screwed to the outer wall of the limit adjustment screw 12, and the outer side of the limit adjustment screw 12 It is connected to the middle part of the inner side of the screw handle 13, and the left side of the inner thread shell 9 of the overflow valve is connected to the left side of the plug body 11 through the spring 10; the input end of the oil inlet pipe 2 and the output end of the oil return pipe 4 are respectively installed and connected to the hydraulic mechanism. When in use, the screw handle 13 can be turned to rotate the limit adjustment screw 12. The limit adjustment screw 12 is threadedly matched with the inner wall of the inner thread shell 9 of the overflow valve to make it move laterally and stop at the corresponding position. The thread self-locking forms a limit to the plug body 11. During operation, oil is fed into the oil inlet pipe 2, acting on the inner side of the oil chamber 3, acting on the piston 6 to apply pressure, so that the telescopic rod 7 slides outward, and when the opening and closing valve 5 is opened, oil is discharged from the oil return pipe 4 to retract the telescopic rod 7. During the process of the telescopic rod 7 sliding outward, the spring 10 can be overcome according to the internal hydraulic pressure to make the plug body 11 slide outward, and the limit of the limit adjustment screw 12 is used to output the oil through the intermediate pipe 23 to the return pipe 4 for reflux to avoid overload.

[0031] It also includes a guide sleeve 8, the inner side of the middle part of the top end of the outer cylinder body 1 is connected to the outer side of the guide sleeve 8, and the inner side of the guide sleeve 8 is slidably connected to the outer side of the telescopic rod 7; the telescopic rod 7 can be slidably constrained by the guide sleeve 8 to avoid its telescopic deviation and improve reliability.

[0032] It also includes an oiling nozzle 21. The outer side of the guide sleeve 8 is provided with an oiling nozzle 21. The output end of the oiling nozzle 21 is connected to the inner side of the guide sleeve 8. The inner wall of the guide sleeve 8 can be oiled through the oiling nozzle 21, which is convenient for lubrication and maintenance.

[0033] It also includes an oil filling cap 22, and the outer side of the oil filling nozzle 21 and the inner side of the oil filling cap 22 can be detachably installed; after the oil filling cap 22 is installed on the outer side of the oil filling nozzle 21, the inside of the oil filling nozzle 21 can be sealed and protected to improve reliability.

[0034] The on-off valve 5 is a well-known device purchased directly from the market by technicians in this field. We only use it here without making any structural or functional improvements to it, so we will not go into details here.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder with a built-in overflow valve, characterized in that: The invention comprises an outer cylinder body (1), an oil inlet pipe (2), an oil chamber (3), an oil return pipe (4), an on-off valve (5), a piston (6), a telescopic rod (7), an internal threaded housing (9) of a relief valve, a spring (10), a plug body (11), a limit adjustment screw rod (12), a screw handle (13) and an intermediate pipe (23). The outer side of the outer cylinder body (1) is provided with an oil inlet pipe (2) and an oil return pipe (4), the oil return pipe (4) is provided with an on-off valve (5), the inner bottom end of the outer cylinder body (1) is connected to the bottom end of the oil chamber (3), the input end of the oil chamber (3) is connected to the inner side of the oil inlet pipe (2), and the output end of the oil chamber (3) is connected to the oil return pipe ( 4), the inner side of the oil chamber (3) is slidably connected to the outer side of the piston (6), the top end of the piston (6) is connected to the bottom end of the telescopic rod (7), the relief valve internal thread housing (9) is arranged on one side of the outer end of the outer cylinder body (1), the output end of the relief valve internal thread housing (9) is connected to one side of the oil return pipe (4) via an intermediate pipe (23), the inner wall of the relief valve internal thread housing (9) is threadedly connected to the outer wall of the limit adjustment screw (12), the outer side of the limit adjustment screw (12) is connected to the middle part of the inner side of the handle (13), and the left side of the inner side of the relief valve internal thread housing (9) is connected to the left side of the plug body (11) via a spring (10).

2. A hydraulic cylinder with a built-in overflow valve according to claim 1, characterized in that: The utility model also comprises a mounting plate (14), a round through groove (15), a long bolt (16), a nut (17), a long mounting groove (18) and a sleeve frame (19); the sleeve frame (19) is connected to the middle part of the inner side of the mounting plate (14); a group of round through grooves (15) are respectively arranged at the four corner sides inside the mounting plate (14); and a group of long mounting grooves (18) are respectively arranged at the middle part of the front and rear sides of the mounting plate (14); the long bolt (16) is movably arranged inside the round through groove (15); and the outer side of the long bolt (16) and the inner side of the nut (17) are detachably screwed together.

3. A hydraulic cylinder with a built-in overflow valve according to claim 1, characterized in that: It also comprises a conical block (20), and the bottom of the piston (6) is provided with the conical block (20).

4. The hydraulic cylinder with a built-in overflow valve according to claim 1, characterized in that: It also includes a guide sleeve (8), wherein the inner side of the middle part of the top end of the outer cylinder body (1) is connected to the outer side of the guide sleeve (8), and the inner side of the guide sleeve (8) is slidably connected to the outer side of the telescopic rod (7).

5. A hydraulic cylinder with a built-in overflow valve according to claim 4, characterized in that: It also comprises an oiling nozzle (21), and the oiling nozzle (21) is arranged on one side of the outer end of the guide sleeve (8), and the output end of the oiling nozzle (21) is connected to the inner side of the guide sleeve (8).

6. A hydraulic cylinder with a built-in overflow valve according to claim 5, characterized in that: It also comprises an oil filling cap (22), and the outer side of the oil filling nozzle (21) and the inner side of the oil filling cap (22) are detachably mounted.

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