Valve body structure for hydraulic cylinder

Abstract

The valve body structure comprises a cylinder barrel, a cylinder cover and a telescopic piston, the cylinder barrel is provided with a plurality of oil inlet holes and exhaust ports, the cylinder barrel is provided with a speed regulating valve, the speed regulating valve comprises an upper valve cover, a lower valve cover and an adjusting piston, the upper valve cover is installed over the oil inlet holes, a sliding groove is formed in the upper valve cover, and the adjusting piston is arranged in the sliding groove. The adjusting piston is inserted into the sliding groove and is in sliding connection with the upper valve deck, and an oil injection opening communicated with the sliding groove is formed in the upper portion of the upper valve deck. The speed regulating valve structure composed of the upper valve cover, the lower valve cover and the regulating piston is matched with the oil inlet holes in a linear array, the motor drives the lead screw to rotate, and therefore the regulating piston is driven to slide, the opening number of the oil inlet holes is regulated, the oil injection and drainage efficiency of the cylinder barrel is controlled, the sliding speed of the telescopic piston is controlled, and the service life of the telescopic piston is prolonged. And due to the multi-group oil inlet hole structure, the telescopic speed of the hydraulic cylinder can be adjusted at multiple gears, and the application range of equipment is greatly widened.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a valve body structure used for a hydraulic cylinder. Background Art

[0002] A 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 reduction device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, 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 scenario, and other devices are indispensable.

[0003] A valve body structure for a hydraulic cylinder disclosed in authorization announcement No. CN216788854U includes a valve body, a base is fixedly connected to the bottom of the valve body, a first cavity is penetrated and arranged in the middle position of the front end of the base, a second cavity is penetrated and arranged in the middle position of the front end of the valve body, a push rod is slidably connected inside the first cavity, a piston is arranged on the top of the push rod and the piston is slidably connected to the second cavity.

[0004] The above-disclosed valve body structure for a hydraulic cylinder realizes the adjustment of the extension and retraction speed of the hydraulic cylinder by setting two oil inlets on the cylinder barrel. However, there are only two oil inlets, which means that the hydraulic cylinder can only be adjusted in two gears between fast and slow. It is easy to cause the lifting speed to be too fast when oil is fed into the two holes at the same time, causing the goods to be damaged under the action of inertia, or the lifting speed to be too slow when oil is fed into a single hole, affecting the loading and unloading speed of goods. Although there are some hydraulic flow rate regulating valves on the existing market, their cost is too high. When used on some small hydraulic cylinders, their cost is far higher than the cost of the hydraulic cylinder, and the structural auxiliary is inconvenient for maintenance. Therefore, a valve body structure for a hydraulic cylinder is needed to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a valve body structure for a hydraulic cylinder, which has the advantage of multi-speed adjustable lifting speed of the hydraulic cylinder, and solves the problems in the prior art that the hydraulic cylinder lifting speed adjustment range is small, the speed regulating valve is too expensive, and the structure is complex and difficult to maintain.

[0006] To achieve the above object, the utility model provides the following technical solutions: a valve body structure for a hydraulic cylinder, comprising a cylinder barrel, a cylinder cover and a telescopic piston, the cylinder barrel being provided with a plurality of oil inlet holes and exhaust ports, and the cylinder barrel being provided with a speed regulating valve;

[0007] The speed regulating valve includes an upper valve cover, a lower valve cover and an adjusting piston. The upper valve cover is installed directly above the oil inlet hole. A slide groove is arranged in the upper valve cover. The adjusting piston is inserted into the slide groove and is slidably connected with the upper valve cover. An oil filling port that passes through the slide groove is arranged above the upper valve cover.

[0008] As a preferred valve body structure for a hydraulic cylinder of the utility model, the oil inlet holes are linearly arranged along the extension direction of the slide groove, and the center axis of the oil filling port coincides with the center axis of the oil inlet hole at the end.

[0009] As a preferred valve body structure for a hydraulic cylinder of the utility model, an inspection cover is provided on the side of the upper valve cover, and the inspection cover is fixedly connected to the upper valve cover by bolts.

[0010] As a preferred valve body structure for a hydraulic cylinder of the utility model, the side end face of the regulating piston is provided with an internally threaded sleeve, the inspection cover is rotatably connected with a screw rod, the screw rod is inserted into the internally threaded sleeve and threadedly connected thereto, and the outer side of the inspection cover is provided with a motor connected to the screw rod through a reducer.

[0011] As a preferred valve body structure for a hydraulic cylinder of the utility model, a first sealing ring is provided on the outer end surface of the inspection cover.

[0012] As a preferred valve body structure for a hydraulic cylinder of the utility model, a second sealing ring is provided between the screw rod and the inspection cover.

[0013] As a preferred valve body structure for a hydraulic cylinder of the utility model, a third sealing ring is provided on the outer end surface of the regulating piston.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. The utility model adopts a speed regulating valve structure composed of an upper valve cover, a lower valve cover and an adjusting piston, which cooperates with the oil inlet holes of a linear array, and drives the screw rod to rotate through a motor, thereby driving the adjusting piston to slide, and adjusting the number of oil inlet holes to be opened, thereby achieving the control of the oil filling and oil discharge efficiency of the cylinder barrel, and achieving the control of the sliding speed of the telescopic piston. The multiple groups of oil inlet hole structures make the telescopic speed of the hydraulic cylinder adjustable in multiple gears, which greatly improves the application range of the equipment.

[0016] 2. The utility model has a simple structure and low cost, and is suitable for installation in small and medium-sized low-end oil pumps. An inspection cover is provided on the side of the upper valve cover, which is convenient for opening and replacing various easily worn and aged parts in the speed regulating valve, thereby reducing the maintenance cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is an exploded view of the utility model;

[0019] Figure 3 It is a front cross-sectional view of the utility model;

[0020] Figure 4 For the utility model Figure 4 Enlarged view of point A in the middle;

[0021] Figure 5 This is a schematic diagram of the cooperation state of the motor, the screw rod and the regulating piston of the utility model.

[0022] In the figure: 1. cylinder barrel; 101. oil inlet hole; 102. exhaust port; 2. cylinder head; 3. telescopic piston; 4. speed control valve; 410. upper valve cover; 411. oil filling port; 412. slide groove; 420. lower valve cover; 430. regulating piston; 431. internal threaded sleeve; 432. third sealing ring; 440. inspection cover; 441. screw; 442. first sealing ring; 443. second sealing ring; 450. motor. DETAILED DESCRIPTION

[0023] See also Figure 1-Figure 5 , a valve body structure for a hydraulic cylinder, comprising a cylinder barrel 1, a cylinder cover 2 and a telescopic piston 3, a plurality of oil inlet holes 101 and an exhaust port 102 are arranged on the cylinder barrel 1, and a speed regulating valve 4 is arranged on the cylinder barrel 1;

[0024] The speed regulating valve 4 includes an upper valve cover 410, a lower valve cover 420 and an adjusting piston 430. The upper valve cover 410 is installed directly above the oil inlet hole 101. A slide groove 412 is provided in the upper valve cover 410. The adjusting piston 430 is inserted into the slide groove 412 and is slidably connected to the upper valve cover 410. An oil filling port 411 that passes through the slide groove 412 is provided above the upper valve cover 410.

[0025] When the device is in use, hydraulic oil is injected through the oil filling port 411, and the hydraulic oil enters the cylinder 1 through the oil filling port 411 and the oil inlet hole 101, and lifts the telescopic piston 3, thereby controlling the operation of the hydraulic cylinder. When it is necessary to adjust the sliding speed of the telescopic piston 3, the motor 450 is started, so that the motor 450 drives the screw rod 441 to rotate, thereby driving the adjusting piston 430 to slide through the screw rod 441 and the internal threaded sleeve 431, and the adjusting piston 430 slides along the slide groove 412, thereby adjusting the opening amount of the oil inlet hole 101, adjusting the flow rate of the hydraulic oil, and realizing the control of the sliding speed of the telescopic piston 3.

[0026] Furthermore, the oil inlet holes 101 are linearly arranged along the extending direction of the slide groove 412 , and the central axis of the oil filling port 411 coincides with the central axis of the last oil inlet hole 101 .

[0027] By adjusting the sliding movement of the piston 430, the number of the oil inlet holes 101 connected to the oil filling port 411 is controlled, thereby controlling the oil filling speed. Multiple groups of oil inlet holes 101 can achieve multi-level adjustable oil filling speed, thereby controlling the extension and retraction speed of the hydraulic cylinder.

[0028] Furthermore, an inspection cover 440 is provided on the side of the upper valve cover 410 , and the inspection cover 440 is fixedly connected to the upper valve cover 410 by bolts.

[0029] The piston can be taken out after the inspection cover 440 is opened, thereby facilitating the inspection of the wear of the piston and the replacement of the surface sealing ring thereof.

[0030] Furthermore, an internal threaded sleeve 431 is provided on the side end face of the regulating piston 430, a screw rod 441 is rotatably connected to the inspection cover 440, the screw rod 441 is inserted into the internal threaded sleeve 431 and threadedly connected thereto, and a motor 450 is provided on the outer side of the inspection cover 440 and is connected to the screw rod 441 via a reducer.

[0031] The motor 450 drives the screw rod 441 to rotate, thereby driving the inner adjusting piston 430 to slide along the slide groove 412 to achieve precise control of the oil inlet hole 101.

[0032] Furthermore, a first sealing ring 442 is provided on the outer end surface of the inspection cover 440 .

[0033] The first sealing ring 442 enhances the sealing performance between the inspection cover 440 and the upper valve cover 410 , thereby preventing the hydraulic oil from leaking between the inspection cover 440 and the upper valve cover 410 .

[0034] Furthermore, a second sealing ring 443 is provided between the screw rod 441 and the inspection cover 440 .

[0035] The second sealing ring 443 enhances the sealing performance between the screw rod 441 and the inspection cover 440 .

[0036] Furthermore, a third sealing ring 432 is disposed on the outer end surface of the regulating piston 430 .

[0037] The friction between the piston and the upper valve cover 410 is increased by the third sealing ring 432 , thereby avoiding improving the speed regulation accuracy and reducing the wear of the regulating piston 430 .

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve body structure for a hydraulic cylinder, comprising a cylinder barrel (1), a cylinder cover (2) and a telescopic piston (3), wherein the cylinder barrel (1) is provided with a plurality of oil inlet holes (101) and exhaust ports (102), characterized in that: The cylinder barrel (1) is provided with a speed regulating valve (4); The speed regulating valve (4) comprises an upper valve cover (410), a lower valve cover (420) and an adjusting piston (430); the upper valve cover (410) is installed directly above the oil inlet hole (101); a slide groove (412) is provided in the upper valve cover (410); the adjusting piston (430) is inserted into the slide groove (412) and is slidably connected to the upper valve cover (410); an oil filling port (411) which is connected to the slide groove (412) is provided above the upper valve cover (410).

2. A valve body structure for a hydraulic cylinder according to claim 1, characterized in that: The oil inlet holes (101) are arranged linearly along the extension direction of the slide groove (412), and the central axis of the oil filling port (411) coincides with the central axis of the oil inlet hole (101) at the end.

3. A valve body structure for a hydraulic cylinder according to claim 2, characterized in that: An inspection cover (440) is provided on the side of the upper valve cover (410), and the inspection cover (440) is fixedly connected to the upper valve cover (410) by bolts.

4. A valve body structure for a hydraulic cylinder according to claim 3, characterized in that: The side end surface of the regulating piston (430) is provided with an internal threaded sleeve (431), the inspection cover (440) is rotatably connected with a screw rod (441), the screw rod (441) is inserted into the internal threaded sleeve (431) and is threadedly connected thereto, and the outer side of the inspection cover (440) is provided with a motor (450) which is transmission-connected to the screw rod (441) via a reducer.

5. A valve body structure for a hydraulic cylinder according to claim 3, characterized in that: The outer end surface of the inspection cover (440) is provided with a first sealing ring (442).

6. A valve body structure for a hydraulic cylinder according to claim 4, characterized in that: A second sealing ring (443) is provided between the screw rod (441) and the inspection cover (440).

7. A valve body structure for a hydraulic cylinder according to claim 1, characterized in that: The outer end surface of the regulating piston (430) is provided with a third sealing ring (432).

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