Hydraulic control system

Abstract

The invention discloses a hydraulic control system, which comprises a valve body; the reversing groove is formed in the valve body; the valve element is arranged in the reversing groove in a sealed and sliding mode. The P channel, the A channel, the B channel and the two T channels are respectively arranged on the valve body; wherein the two ends of the P channel and the two T channels are communicated with the oil tank and the valve body respectively, the two ends of the A channel and the two ends of the B channel are communicated with the hydraulic cylinder and the valve body respectively, the valve element is provided with a middle section, two tail ends and a connecting section fixedly connected between the middle section and the tail ends, and a groove body is formed in the middle section; the middle section corresponding to the P channel stops the hydraulic oil from advancing, and the groove body accommodates the hydraulic oil which advances inertially. The buffer space is formed in the middle section of the valve element through the groove body, hydraulic oil with inertia is contained while the hydraulic oil is blocked, inertia is released, and the impact force of the hydraulic oil inertia to the valve element is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic drive equipment, and in particular to a hydraulic control system. 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. The hydraulic cylinder is equipped with a hydraulic reversing valve, which is a valve used to control the flow direction of the fluid in the hydraulic cylinder. By changing the relative position of the valve core and the valve body, the oil circuit can be connected, cut off and reversed, thereby controlling the start and stop and movement direction of the actuator.

[0003] The hydraulic oil in the oil circuit is driven by the power of the pump body in the oil tank to allow the hydraulic oil to enter the hydraulic reversing valve. When the valve core changes its relative position with the valve body, the valve core is attracted to one side by energizing the electromagnet, and the valve core is returned to the middle position after it is no longer attracted by the spring in the valve body. In this process, the valve core will release and block the hydraulic oil when it is attracted to one side and returns to the middle position, thereby changing the current status of the hydraulic oil in the oil circuit. At the moment of blocking the hydraulic oil, the hydraulic oil has the inertia to continue moving forward, and its kinetic energy impacts the valve core, and the valve core itself is a sealing component. If the operation of the frequent reversal of the fluid in the hydraulic cylinder causes the frequency of hydraulic oil impacting the valve core to increase, it is easy to cause the valve core position to be misaligned and the sealing to be lost. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic control system to reduce the impact of the inertia of hydraulic oil on the valve core.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A hydraulic control system, comprising:

[0007] Valve body;

[0008] A reversing groove is provided inside the valve body;

[0009] The valve core is sealingly and slidingly arranged inside the reversing groove;

[0010] The P channel, A channel, B channel and two T channels are respectively opened on the valve body;

[0011] Among them, the two ends of the P channel and the two T channels are connected to the oil tank and the valve body respectively, and the two ends of the A channel and the B channel are connected to the hydraulic cylinder and the valve body respectively. The valve core has a middle section, two ends and a connecting section fixedly connected between the middle section and the ends. There is a groove body in the middle section. When the valve core is in the middle position, the middle section corresponds to the P channel to block the advancement of the hydraulic oil, and the groove body accommodates the hydraulic oil that moves forward by inertia.

[0012] Preferably, the tank body is annular in shape, and after entering the tank body through the P channel and being divided, the water converges at one place again and offsets each other.

[0013] Preferably, the valve core middle section comprises:

[0014] case;

[0015] A cavity is provided inside the shell;

[0016] A through port is provided on the side wall of the shell and communicates with the cavity;

[0017] Two circular plates are sealingly and slidably arranged inside the cavity;

[0018] A collar is fixedly connected coaxially with one of the circular plates;

[0019] A sleeve column is fixedly connected to another circular plate coaxially;

[0020] Wherein, a sealing sliding arrangement is provided between the inner ring of the sleeve and the sleeve column;

[0021] Among them, a groove body is formed between the two circular plates, the sleeve ring, the sleeve column and the shell, and the groove body is a part of the cavity, and the groove body is communicated with the through port.

[0022] Preferably, a connecting block is fixedly provided on the top of the circular plate, an elastic groove is provided inside the valve body, a horizontal axis is fixedly connected in the elastic groove, a sealing sliding arrangement is provided between the connecting block and the horizontal axis, a compression spring is provided outside the horizontal axis, and both ends of the compression spring are respectively connected to the two connecting blocks, and the elastic force of the compression spring causes the two connecting blocks to be located at both ends of the elastic groove.

[0023] Preferably, a small hole is opened on the collar, and a sponge ball is placed inside the collar, so that the hydraulic oil that is divided in the tank body and gathered again enters the collar through the small hole and is adsorbed by the sponge ball.

[0024] Preferably, the shell is provided with an adapting groove, the connecting block passes through the adapting groove and is sealingly and slidingly arranged between the adapting groove, and the shell is further provided with two extension grooves.

[0025] Preferably, two electromagnet power supply devices are also provided on the valve body, which are respectively provided on both sides of the valve body, and generate a magnetic field to attract the valve core inside the valve body when powered on.

[0026] Preferably, two springs are arranged in the valve body, and the two springs are arranged on both sides of the valve core respectively, for keeping the valve core in a neutral position. Limiting rings are also arranged on both sides of the valve core respectively, and the limiting rings are fixedly connected to the valve body.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention forms a buffer space by arranging a groove body in the middle section of the valve core, which blocks the hydraulic oil while accommodating the hydraulic oil that continues to move forward with inertia, releases the inertia, and reduces the impact force of the hydraulic oil inertia on the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a valve body and electromagnet energizing devices on both sides thereof in a hydraulic control system proposed by the present invention;

[0030] Figure 2 A schematic diagram of the internal structure of a valve body in a hydraulic control system proposed by the present invention;

[0031] Figure 3 for Figure 2 Schematic diagram of structural decomposition;

[0032] Figure 4 This is a structural schematic diagram of a valve core in a hydraulic control system proposed by the present invention;

[0033] Figure 5 A schematic diagram of the cross-sectional structure of a valve core in a hydraulic control system proposed by the present invention;

[0034] Figure 6 From top to bottom are schematic diagrams of the structure of a hydraulic cylinder, a hydraulic reversing valve and an oil tank containing a pump body in a hydraulic control system proposed by the present invention.

[0035] In the figure: 1. valve body; 2. reversing groove; 4. P channel; 5. A channel; 6. B channel; 7. T channel; 8. middle section; 9. end; 10. connecting section; 11. groove body; 12. shell; 13. through port; 14. round plate; 15. collar; 16. sleeve column; 17. connecting block; 18. elastic groove; 19. horizontal axis; 20. compression spring; 21. small hole; 22. sponge ball; 23. adapter groove; 24. extension groove; 26. spring; 27. limit ring; 28. electromagnet power supply device. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Reference Figure 1 -Attached Figure 6 , a hydraulic control system, comprising:

[0038] Valve body 1;

[0039] A reversing groove 2 is provided inside the valve body 1;

[0040] The valve core is sealingly and slidably arranged inside the reversing groove 2;

[0041] A P channel 4, an A channel 5, a B channel 6 and two T channels 7 are respectively provided on the valve body 1;

[0042] Among them, the two ends of the P channel 4 and the two T channels 7 are respectively connected to the oil tank and the valve body 1, and the two ends of the A channel 5 and the B channel 6 are respectively connected to the hydraulic cylinder and the valve body 1. The valve core has a middle section 8, two end ends 9 and a connecting section 10 fixedly connected between the middle section 8 and the end ends 9. The middle section 8 has a groove body 11. When the valve core is in the middle position, the middle section 8 corresponds to the P channel 4 to block the advancement of the hydraulic oil, and the groove body 11 accommodates the hydraulic oil that moves forward by inertia.

[0043] Through the above technical solution, a buffer space is formed in the middle section 8 of the valve core by setting the groove body 11, which blocks the hydraulic oil while accommodating the hydraulic oil that continues to move forward with inertia, releases the inertia, and reduces the impact force of the hydraulic oil inertia on the valve core.

[0044] The tank body 11 is annular in shape. After entering the tank body 11 through the P channel 4 and being divided, the oil converges at one point again and impacts each other, so that the hydraulic oil entering the tank body 11 attenuates the kinetic energy and reduces the impact force of the hydraulic oil inertia on the valve core.

[0045] The valve core middle section 8 comprises:

[0046] Housing 12;

[0047] A cavity is provided inside the housing 12;

[0048] A through opening 13 is provided on the side wall of the housing 12 and communicates with the cavity;

[0049] Two circular plates 14 are sealingly and slidably arranged inside the cavity;

[0050] A collar 15 is coaxially fixedly connected to one of the circular plates 14;

[0051] A sleeve column 16 is coaxially fixedly connected to another circular plate 14;

[0052] Among them, the inner ring of the collar 15 and the sleeve column 16 are sealed and slidably arranged;

[0053] A groove body 11 is formed between the two circular plates 14 , the sleeve ring 15 , the sleeve column 16 and the housing 12 . The groove body 11 is a part of the cavity and is communicated with the through port 13 .

[0054] A connecting block 17 is fixedly provided on the top of the circular plate 14, an elastic groove 18 is provided inside the valve body 1, a transverse axis 19 is fixedly connected inside the elastic groove 18, a sealing sliding arrangement is provided between the connecting block 17 and the transverse axis 19, a compression spring 20 is provided outside the transverse axis 19, and two ends of the compression spring 20 are respectively connected to the two connecting blocks 17, and the elastic force of the compression spring 20 causes the two connecting blocks 17 to be located at the two ends of the elastic groove 18.

[0055] Through the above technical solution, the valve core is attracted to move to one side by energizing the electromagnet, and the middle section 8 moves synchronously in the same direction, so that the shell 12 of the middle section 8 pushes one of the circular plates 14, so that the space of the tank body 11 becomes smaller, and part of the hydraulic oil in the tank body 11 is pushed out through the port 13, so as to release and buffer the inertia of the hydraulic oil next time.

[0056] A small hole 21 is formed on the collar 15 , and a sponge ball 22 is placed inside the collar 15 . The hydraulic oil that is divided and gathered again in the tank body 11 enters the collar 15 through the small hole 21 and is adsorbed by the sponge ball 22 .

[0057] Through the above technical scheme, the buffer space of the valve core is expanded, and the inside of the ring 15 is used as a secondary buffer area for the hydraulic oil. At the same time, a sponge ball 22 made of sponge material is provided inside the ring 15. The sponge ball 22 is loose and porous, which plays a role in hindering the impact of the hydraulic oil on the valve core. While hindering, it can also absorb the hydraulic oil to play a buffering role, so that the kinetic energy of the hydraulic oil is attenuated, and the impact force of the hydraulic oil inertia on the valve core is reduced.

[0058] The housing 12 is provided with an adapting groove 23, the connecting block 17 passes through the adapting groove 23 and is sealed and slidably arranged with the adapting groove 23, and the housing 12 is also provided with two extension grooves 24. When the valve core is attracted to one side, one of the extension grooves 24 is connected with the P channel 4, so that the hydraulic oil of the P channel 4 enters the A channel 5 or the B channel 6.

[0059] Two electromagnet energizing devices 28 are also provided on the valve body 1 , which are respectively provided on both sides of the valve body 1 . When energized, a magnetic field is generated to attract the valve core inside the valve body 1 .

[0060] Two springs 26 are arranged in the valve body 1 . The two springs 26 are arranged on both sides of the valve core respectively, and are used to keep the valve core in the middle position. Limiting rings 27 are also arranged on both sides of the valve core respectively. The limiting rings 27 are fixedly connected to the valve body 1 .

[0061] Working principle:

[0062] The pump body in the oil tank provides driving force to make the hydraulic oil enter the P channel 4. When the solenoid is not energized, the valve core is in the middle position. At this time, the four channels P, T, A, and B are not connected, and the hydraulic system is in a pressure-maintaining state.

[0063] When one side of the electromagnet is energized, the valve core will be attracted to one side, so that the P channel 4 is connected with the A channel 5, and the B channel 6 is connected with the T channel 7. The hydraulic oil flows in from the P channel 4, passes through the A channel 5 and enters the actuator (hydraulic cylinder), and then flows out from the B channel 6 and returns to the oil tank, realizing the positive movement of the actuator;

[0064] When the solenoid on one side is de-energized, the valve core returns to the middle position under the action of the spring 26, and the hydraulic system is in a pressure-maintaining state again;

[0065] When the electromagnet on the other side is energized, the valve core will be attracted to the other side, so that P channel 4 is connected with B channel 6, A channel 5 is connected with T channel 7, and the hydraulic oil flows in from P channel 4, enters the actuator through B channel 6, and then flows out from A channel 5 and returns to the oil tank, realizing the reverse movement of the actuator.

[0066] It should be noted that:

[0067] When the valve core moves to one side in the valve body 1, one of the circular plates 14 moves toward the other circular plate 14, and the sleeve 16 squeezes the sponge ball 22 inside the sleeve ring 15. The setting of the limit ring 27 is used to limit the excessive movement of the valve core to one side, thereby limiting the range of movement of the valve core to one side, so that the sleeve 16 can squeeze the sponge ball 22 to release oil, and prevent the sleeve 16 from excessively squeezing the sponge ball 22, thereby avoiding the sponge ball 22 from being damaged;

[0068] When the valve core returns to the middle position from either side, the hydraulic oil in the P channel 4 will be instantly blocked. The inertia of the hydraulic oil will impact the valve core, and the more frequent the reversal of the forward and reverse motion of the hydraulic cylinder, the higher the impact frequency. Therefore, the present application provides a groove 11 corresponding to the P channel 4 in the middle section 8 of the valve core, so that the hydraulic oil with inertia is blocked by the valve core while leaving a buffer space for releasing its inertia;

[0069] When the valve core is attracted to one side from the middle position, the through port 13 of the valve core middle section 8 is not connected with the P channel 4, but one of the extension grooves 24 on the valve core middle section 8 is connected with the P channel 4, so that the P channel 4 is connected with the A channel 5 or the B channel 6;

[0070] The valve core is attracted to one side from the middle position, because the sudden opening makes the P channel 4 connected with the A channel 5 or the B channel 6, which will reduce the pressure in the P channel 4. Under the condition that the external air pressure remains unchanged, a pressure difference will appear on the valve body 1. Frequent switching operations may cause the P channel 4 to collapse. Therefore, the valve core is attracted to one side from the middle position, which will instantly squeeze part of the hydraulic oil in the tank body 11 through the port 13 into the P channel 4 to fill the pressure difference and reduce the pressure difference.

[0071] The electromagnet energizing device 28 generates a magnetic field when energized, and the magnetic field disappears when the power is turned off. This is a prior art and will not be described in detail here.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic control system, characterized in that: include: Valve body (1); A reversing groove (2) is provided inside the valve body (1); A valve core is sealingly and slidably arranged inside the reversing groove (2); The P channel (4), the A channel (5), the B channel (6) and the two T channels (7) are respectively provided on the valve body (1); The two ends of the P channel (4) and the two T channels (7) are respectively connected to the oil tank and the valve body (1); the two ends of the A channel (5) and the B channel (6) are respectively connected to the hydraulic cylinder and the valve body (1); the valve core has a middle section (8), two ends (9) and a connecting section (10) fixedly connected between the middle section (8) and the ends (9); the middle section (8) has a groove (11); when the valve core is in the middle position, the middle section (8) blocks the hydraulic oil from advancing corresponding to the P channel (4), and the groove (11) contains the hydraulic oil advancing by inertia.

2. A hydraulic control system according to claim 1, characterized in that: The tank body (11) is annular in shape, and the water entering the tank body (11) through the P channel (4) is divided and then converges at one point again to collide with each other.

3. A hydraulic control system according to claim 1, characterized in that: The valve core middle section (8) comprises: Housing (12); A cavity is provided inside the housing (12); A through opening (13) is provided on the side wall of the housing (12) and is communicated with the cavity; Two circular plates (14) are sealingly and slidably arranged inside the cavity; A collar (15) is coaxially fixedly connected to one of the circular plates (14); A sleeve column (16) is coaxially fixedly connected to another circular plate (14); Wherein, a sealing sliding arrangement is provided between the inner ring of the sleeve ring (15) and the sleeve column (16); A groove body (11) is formed between the two circular plates (14), the sleeve ring (15), the sleeve column (16) and the housing (12); the groove body (11) is a part of the cavity; and the groove body (11) is in communication with the through port (13).

4. A hydraulic control system according to claim 3, characterized in that: A connecting block (17) is fixedly arranged on the top of the circular plate (14); an elastic groove (18) is provided inside the valve body (1); a transverse axis (19) is fixedly connected inside the elastic groove (18); a sealing sliding arrangement is arranged between the connecting block (17) and the transverse axis (19); a compression spring (20) is arranged outside the transverse axis (19); two ends of the compression spring (20) are respectively connected to the two connecting blocks (17); and the elastic force of the compression spring (20) causes the two connecting blocks (17) to be located at the two ends of the elastic groove (18).

5. A hydraulic control system according to claim 3, characterized in that: A small hole (21) is formed on the collar (15), and a sponge ball (22) is placed inside the collar (15). The hydraulic oil that is divided and gathered again in the tank body (11) enters the collar (15) through the small hole (21) and is adsorbed by the sponge ball (22).

6. A hydraulic control system according to claim 3, characterized in that: The housing (12) is provided with an adapting groove (23), the connecting block (17) passes through the adapting groove (23) and is arranged in a sealing and sliding manner with the adapting groove (23), and the housing (12) is also provided with two extension grooves (24).

7. A hydraulic control system according to claim 1, characterized in that: Two electromagnet power supply devices (28) are also provided on the valve body (1), which are respectively provided on both sides of the valve body (1) and generate a magnetic field to attract the valve core inside the valve body (1) when power is supplied.

8. A hydraulic control system according to claim 1, characterized in that: Two springs (26) are arranged in the valve body (1). The two springs (26) are arranged on both sides of the valve core respectively and are used to keep the valve core in a neutral position. Limiting rings (27) are also arranged on both sides of the valve core respectively. The limiting rings (27) are fixedly connected to the valve body (1).

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