A variable amplitude balancing valve

Abstract

The present invention discloses a variable amplitude balancing valve, which comprises a valve block, on which a pressure oil port, an oil supply port and a control oil port are provided, and a check valve, a relief valve and a balancing valve which work independently are provided in the valve block, and hydraulic oil can first enter the check valve through the pressure oil port, and then pass through the oil supply port, and the relief valve can unload the pressure of the oil supply port, and the control oil can enter the balancing valve through the control oil port, and the balancing valve can open the sealed oil port between the oil supply port and the pressure oil port. The present invention arranges the check valve, the relief valve and the balancing valve separately, which effectively reduces the processing difficulty, and also greatly improves the damping effect of the balancing valve.

Description

Technical Field

[0001] The invention relates to a hydraulic control valve, in particular to a variable amplitude balancing valve. Background Art

[0002] The one-way valve, the overflow valve and the balancing valve in the existing variable amplitude balancing valve are not arranged independently, and the overall structure is very complicated.

[0003] In addition, the damping effect of the balancing valve is not good. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a variable amplitude balancing valve.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A variable amplitude balancing valve, the variable amplitude balancing valve includes a valve block, the valve block is provided with a pressure oil port, an oil supply port and a control oil port, the valve block is provided with a one-way valve, an overflow valve and a balancing valve which work independently of each other, the hydraulic oil can first enter the one-way valve through the pressure oil port, and then pass through the oil supply port, the overflow valve can unload the pressure of the oil supply port, the control oil can enter the balancing valve through the control oil port, and the balancing valve can open the oil sealing port between the oil supply port and the pressure oil port.

[0007] In a preferred embodiment of the present invention, the one-way valve comprises a first valve body, a one-way valve core, a first spring and a first screw plug. The one-way valve core and the first spring are installed together in the first valve body, and the first spring is pre-compressed by screwing in the first screw plug.

[0008] In a preferred embodiment of the present invention, the relief valve includes a relief valve core, a second valve body, a spring seat, a second spring and a pressure regulating device, the second valve body is connected to the valve block, the pressure regulating device, the second spring and the spring seat are arranged in the second valve body in sequence, one end of the relief valve core is connected to the spring seat, a pressure relief channel is provided in the valve block, the pressure relief channel is connected to the oil supply port, the other end of the relief valve core is inserted in the pressure relief channel, and a gap is reserved between the relief valve core and the pressure relief channel.

[0009] In a preferred embodiment of the present invention, the pressure regulating device includes a washer, a second screw plug and a locking screw, the washer is connected to one end of the second spring via the locking screw, and the second screw plug is cooperatively connected to the locking screw.

[0010] In a preferred embodiment of the present invention, the connecting end surface of the overflow valve core and the spring seat is spherical, and the bottom end surface of the spring seat is conical.

[0011] In a preferred embodiment of the present invention, the balancing valve includes a third valve body, a balancing valve core, a grid ring, a balancing valve seat and a hydraulic chamber, the third valve body is connected to the valve block, the balancing valve core is arranged in the valve block, and can block the oil sealing port between the oil supply port and the pressure oil port, the grid ring is arranged at one end of the balancing valve core, the balancing valve seat is arranged at the other end of the balancing valve core, the balancing valve core is provided with a plurality of stepped arc grooves or semicircular grooves, and the hydraulic chamber is arranged in the third valve body and connected to the balancing valve seat.

[0012] In a preferred embodiment of the present invention, the hydraulic chamber includes a balancing valve spring seat, a third spring, a damper, a third spring seat, a fourth spring, a fourth spring seat, a steel ball, a third plug, a fourth plug and a gasket, the steel ball is arranged at one end of the balancing valve seat, the fourth spring seat is in contact with the steel ball, the fourth spring is connected to the fourth spring seat, the third spring seat is connected to the fourth spring, the damper is connected to the third spring seat, the balancing valve spring seat is connected to the third spring, the fourth plug is connected to the balancing valve spring seat, the third plug is matched with the fourth plug, a first flow channel is provided in the damper shaft, a second flow channel is provided in the balancing valve seat, and a third flow channel is provided between the balancing valve seat and the balancing valve spring seat.

[0013] In a preferred embodiment of the present invention, a first O-ring is provided between the third valve body and the valve block, and a second O-ring is provided between the fourth screw plug and the third valve body.

[0014] The beneficial effects of the present invention are:

[0015] The present invention arranges the one-way valve, the overflow valve and the balancing valve separately, which effectively reduces the processing difficulty and greatly improves the damping effect of the balancing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a structural schematic diagram of a one-way valve;

[0019] Figure 3 It is a structural schematic diagram of the overflow valve;

[0020] Figure 4 It is a structural schematic diagram of a balancing valve;

[0021] Figure 5 It is a structural diagram of the balancing valve core;

[0022] Figure 6 for Figure 5 Cross-sectional view along the AA direction. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0024] See also Figures 1 to 6 The variable amplitude balancing valve provided by the present invention includes a valve block 200, on which a pressure oil port V, an oil supply port C and a control oil port P are provided. The switching between the pressure oil port V and the control oil port P on the valve block 200 is converted by a reversing valve.

[0025] A one-way valve 300 , a relief valve 400 and a balance valve 500 are provided in the valve block 200 and each of them works independently.

[0026] The one-way valve 300 is used to realize the lifting action of the hydraulic cylinder, and includes a first valve body 304, a one-way valve core 301, a first spring 302 and a first plug screw 303. The one-way valve core 301 and the first spring 302 are installed in the first valve body 304 together, and the first plug screw 303 is screwed in to pre-compress the first spring 302. The hydraulic oil can enter the first valve body 304 through the pressure oil port V, and then overcome the spring force of the first spring 302 to directly reach the oil supply port C to supply oil to the rodless chamber of the hydraulic cylinder, thereby realizing the lifting action of the main rod.

[0027] The one-way valve 300 formed by the above structure can be arranged separately, avoiding the concentricity problem when the one-way valve core 301 and the balancing valve core 514 of the balancing valve 500 are coaxially arranged, thus simplifying the structure.

[0028] In addition, a conical surface is provided on the one-way valve core 301, and a hard seal is formed between the conical surface and the first valve body 304 to meet the pressure maintenance requirement, while the first spring 302 has a relatively small stiffness, which can effectively reduce the pressure loss during forward opening.

[0029] During the lifting or pressure-maintaining stage of the hydraulic cylinder, due to external load or temperature rise, the pressure at the oil supply port C may increase to near the rated pressure of the hydraulic cylinder, so the pressure needs to be unloaded, and the relief valve 400 can be used to unload the pressure.

[0030] The relief valve 400 includes a relief valve core 401, a second valve body 404, a spring seat 402, a second spring 403 and a pressure regulating device. The second valve body 404 is connected to the valve block 200. The pressure regulating device, the second spring 403 and the spring seat 402 are arranged in the second valve body 404 in sequence. One end of the relief valve core 401 is connected to the spring seat 402, and the other end is inserted in the pressure relief channel of the valve block 200, and a gap is reserved between the relief valve core 401 and the pressure relief channel.

[0031] The pressure transmitted from the oil supply port C can flow into the gap between the overflow valve core 401 and the pressure relief channel and act on the lower end of the overflow valve core 401, pushing the valve core 401 to overcome the pre-set spring force of the second spring 403, so that part of the oil flows from the oil supply port C to the pressure oil port V and back to the oil tank to achieve pressure unloading.

[0032] In addition, the present application can also adjust the unloading pressure through the pressure regulating device. The pressure regulating device includes a gasket 405, a second plug screw 406 and a locking screw 407. The gasket 405 is connected to one end of the second spring 403 through the locking screw 407. When the pressure needs to be adjusted, just remove the second plug screw 406, loosen the locking screw 407, adjust the gasket 405, and after the setting is completed, tighten the locking screw 407 and screw on the second plug screw 406. The second plug screw 406 can effectively protect the gasket 405 and prevent human error.

[0033] Furthermore, the connecting end surface between the overflow valve core 401 and the spring seat 402 is spherical, and the bottom end surface of the spring seat 402 is conical corresponding to the sphere, which can play a centering role, and the effective compression of the second spring 403 can be guaranteed between the spring seat 402 and the gasket 405.

[0034] The balancing valve 500 is used to realize the descent and amplitude change of the hydraulic cylinder, and includes a third valve body 517, a balancing valve core 514, a grid ring 515, a balancing valve seat 513 and a hydraulic chamber 5080. The third valve body 517 is connected to the valve block 200. The balancing valve core 514 is arranged in the valve block 200 and can block the oil sealing port 210 between the oil supply port C and the pressure oil port V. The grid ring 515 is arranged at one end of the balancing valve core 514, and the balancing valve seat 513 is arranged at the other end of the balancing valve core 514. The balancing valve core 514 is provided with a plurality of stepped arc grooves or semicircular grooves 5140.

[0035] The control oil can enter the grid ring 515 side of the balancing valve core 514 from the control oil port P. As the control pressure increases, the control pressure gradually balances the spring force on the valve seat 513, and the balancing valve core 514 will be pushed upward. During the movement of the balancing valve core 514, the various arc grooves or semicircular grooves 5140 on the balancing valve core 514 will gradually contact the oil sealing port 210, thereby gradually opening the oil sealing port 210, and the oil on the oil supply port C can flow to the pressure oil port V through the oil sealing port 210, thereby realizing the descent of the hydraulic cylinder.

[0036] The width and depth of the arc groove or semicircular groove 5140 on the balance valve core 514 are arranged from small to large, and are evenly arranged at 120° along the center of the balance valve core 514, which effectively reduces movement impact, has a relatively simple structure, and is easy to process.

[0037] In addition, the present application uses the grid ring 515 on the balance valve core 514 to isolate the control oil port P and the pressure oil port V, so that the movement friction is small, which helps the balance valve core 514 to move smoothly.

[0038] The hydraulic chamber 5080 is arranged in the third valve body 517, and is used to slowly discharge the oil therein to form a better damping effect and reduce the impact when the pressure is released. It includes a balancing valve spring seat 505, a third spring 506, a damper 507, a third spring seat 508, a fourth spring 509, a fourth spring seat 510, a steel ball 511, a third plug screw 501, a fourth plug screw 502 and a gasket 504.

[0039] The steel ball 511 is arranged at one end of the balancing valve seat 513, the fourth spring seat 510 is in contact with the steel ball 511, the fourth spring 509 is connected to the fourth spring seat 510, the third spring seat 508 is connected to the fourth spring 509, the damper 507 is connected to the third spring seat 508, the balancing valve spring seat 505 is connected to the third spring 506, the fourth screw plug 502 is connected to the balancing valve spring seat 505, the third screw plug 501 is matched with the fourth screw plug 502, and the third spring 506 is in a relaxed state. After the balancing valve core 514 is installed into the valve block 200 and is in place, the third spring 506 is compressed, and the balancing valve core 514 is pressed against the sealing oil port 210. Only when the pressure of the control oil port P rises can it be gradually pushed open to realize the lowering of the hydraulic cylinder.

[0040] A first flow channel 5070 is provided in the damper 507 shaft, a second flow channel 5050 is provided in the balancing valve seat 513 , and a third flow channel 5130 is provided between the balancing valve seat 513 and the balancing valve spring seat 505 .

[0041] When the balancing valve core 514 is located on the oil sealing port 210, the oil in the hydraulic chamber 5180 can flow out from the first flow channel 5070 of the damper 507 and then through the second flow channel 5050 of the balancing valve seat 513. During the movement of the balancing valve core 514 opening, the second flow channel 5050 will be gradually closed, and the oil in the hydraulic chamber 5180 can only flow out slowly from the third flow channel 5130, forming a damping effect, thereby effectively reducing the hydraulic shock when the oil supply port C to the pressure oil port V is opened.

[0042] In addition, in order to improve the sealing performance, a first O-ring 512 is provided between the third valve body 517 and the valve block 200 , and a second O-ring 503 is provided between the fourth plug screw 502 and the third valve body 517 .

[0043] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A variable amplitude balancing valve, comprising a valve block, the valve block being provided with a pressure oil port, an oil supply port and a control oil port, characterized in that: The switching between the pressure oil port and the control oil port on the valve block is converted by the reversing valve; the valve block is provided with a one-way valve, an overflow valve and a balancing valve which work independently of each other, the hydraulic oil can first enter the one-way valve through the pressure oil port, and then pass through the oil supply port, the overflow valve can unload the pressure of the oil supply port, the control oil can enter the balancing valve through the control oil port, and the balancing valve can open the sealing oil port between the oil supply port and the pressure oil port; the balancing valve comprises a third valve body, a balancing valve core, a grid ring, a balancing valve seat and a hydraulic cavity, the third valve body is communicated with the valve block, the balancing valve core is arranged in the valve block, and can block the sealing oil port between the oil supply port and the pressure oil port, the grid ring is arranged at one end of the balancing valve core, the balancing valve seat is arranged at the other end of the balancing valve core, the balancing valve core is provided with a plurality of stepped arc grooves or semicircular grooves, the hydraulic cavity is arranged in the third valve body and connected to the balancing valve seat; The hydraulic chamber comprises a balancing valve spring seat, a third spring, a damper, a third spring seat, a fourth spring, a fourth spring seat, a steel ball, a third screw plug, a fourth screw plug and a washer, the steel ball is arranged at one end of the balancing valve seat, the fourth spring seat is in contact with the steel ball, the fourth spring is connected to the fourth spring seat, the third spring seat is connected to the fourth spring, the damper is connected to the third spring seat, the balancing valve spring seat is connected to the third spring, the fourth screw plug is connected to the balancing valve spring seat, the third screw plug is matched with the fourth screw plug, a first flow channel is arranged in the damper shaft, a second flow channel is arranged in the balancing valve seat, and a third flow channel is arranged between the balancing valve seat and the balancing valve spring seat; The one-way valve comprises a first valve body, a one-way valve core, a first spring and a first screw plug. The one-way valve core and the first spring are installed in the first valve body together, and the first spring is pre-compressed by screwing in the first screw plug.

2. A variable amplitude balancing valve according to claim 1, characterized in that: The relief valve includes a relief valve core, a second valve body, a spring seat, a second spring and a pressure regulating device. The second valve body is connected to the valve block. The pressure regulating device, the second spring and the spring seat are arranged in the second valve body in sequence. One end of the relief valve core is connected to the spring seat. A pressure relief channel is provided in the valve block. The pressure relief channel is connected to the oil supply port. The other end of the relief valve core is inserted in the pressure relief channel, and a gap is reserved between the relief valve core and the pressure relief channel.

3. A variable amplitude balancing valve according to claim 2, characterized in that: The pressure regulating device comprises a washer, a second screw plug and a locking screw. The washer is connected to one end of the second spring via the locking screw, and the second screw plug is cooperatively connected to the locking screw.

4. The variable amplitude balancing valve according to claim 2, characterized in that: The connecting end surface of the overflow valve core and the spring seat is spherical, and the bottom end surface of the spring seat is conical.

5. The variable amplitude balancing valve according to claim 4, characterized in that: A first O-ring is provided between the third valve body and the valve block, and a second O-ring is provided between the fourth screw plug and the third valve body.

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