Stacked combined differential valve

Abstract

The stacked combined differential valve is used for achieving the differential and pressure relief combined function of an execution element and achieving the effect that the execution element can act at a high speed, and small-flow and high-speed operation is achieved. And when the differential pressure is greater than the set pressure, differential motion is stopped, oil of the execution element is fully returned, and the pressure of the port A is increased to the maximum. Therefore, the running speed, the reaction speed and effective acting can be effectively considered. Meanwhile, the overall structure is very simple, the integration level is high, and the size is small. And a stacked intelligent module is designed, so that the follow-up maintenance, installation and problem handling are very convenient. After the assembly part is additionally arranged, a plurality of sandwich valves can be installed by adopting screws to penetrate through the installation holes in the prior art, every two adjacent sandwich valves can be assembled and fixed by utilizing the matching of the connecting rods and the clamping and locking blocks, the use is very convenient and flexible, and particularly, the assembling is very convenient by adopting the connecting rods and the clamping and locking blocks. In subsequent maintenance, only the corresponding sandwich valves need to be dismounted, complete dismounting is not needed, the maintenance efficiency is high, and the cost is low.

Description

Technical Field

[0001] This utility model relates to differential valves, and in particular to a superimposed combined differential valve. Background Technology

[0002] A differential valve is a control valve that achieves a specific function through the principle of differential operation. In hydraulic cylinder control, a differential valve can be used to allow the cylinder rod to extend rapidly and then be gradually pressurized, thus improving the cylinder's response speed. Currently, the main approach is to add a directional valve. After the cylinder rod extends rapidly, the directional valve reverses, pressurizing the rodless chamber and rapidly depressurizing the oil in the rod chamber, thereby increasing the pressure output by the cylinder rod. This method makes the hydraulic circuit system more complex, the oil pipes more tangled and inconvenient to maintain, and the overall size is also larger.

[0003] In response, a superimposed combination design could effectively simplify the structure, reduce the size, and facilitate maintenance. Ideally, it would also include automatic pressure relief based on pressure difference, which would pressurize the rodless chamber after the cylinder rod extends rapidly, thereby simplifying the hydraulic circuit system and control system, and making it convenient to use. However, such a design does not currently exist, which has become a technical problem that needs to be solved. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is to provide a superimposed combined differential valve with high integration, simple structure and small size.

[0005] To achieve the above objectives, this utility model provides a superimposed combined differential valve for driving an actuator, including a pressure relief valve, a first check valve, a second check valve, port A, port B, port B0, port K, and port Y, with port A connected to a fifth oil passage; the actuator includes a first oil port and a second oil port, with the first oil port and the second oil port connected to port B0 and port A, respectively.

[0006] The B0 port is connected to the oil inlet of the pressure relief valve through the first channel, the first channel is connected to the inlet of the first check valve through the second channel, the first outlet of the first check valve is connected to the fifth oil passage through the first connecting channel; the B port is connected to the oil outlet of the pressure relief valve through the fourth connecting channel.

[0007] The first channel is connected to the outlet of the second check valve through the third channel, the third channel is connected to the oil outlet of the pressure relief valve through the fourth channel, and the inlet of the second check valve is connected to the fourth connecting channel through the fifth channel.

[0008] The fifth oil passage is connected to the pilot inlet of the pressure relief valve via the B3 oil passage, and the pilot outlet of the pressure relief valve is connected to the first oil passage or the Y port via the B4 oil passage.

[0009] As a further improvement of this utility model, the second outlet of the first one-way valve is connected to the third connecting channel through the second connecting channel, one end of the third connecting channel is connected to port K, and the other end is connected to the fourth connecting channel.

[0010] As a further improvement of this utility model, there are at least two A ports, and each A port is connected to the other via a fifth oil passage.

[0011] As a further improvement of this utility model, there are at least two Y ports, and each Y port is connected to the other via a first oil passage.

[0012] As a further improvement of this utility model, the superimposed combined differential valve also includes a P port, a T port, and an X port. There can be at least two P ports, a T port, and an X port. Each P port is connected to the other through a second oil passage, each T port is connected to the other through a third oil passage, and each X port is connected to the other through a fourth oil passage. The T port is connected to the B port.

[0013] As a further improvement of this utility model, it also includes a valve body, on which ports A, B, B0, T, P, X, Y, and K are respectively provided, and mounting holes are also provided on the valve body.

[0014] As a further improvement of this utility model, the valve body is also provided with an assembly part, which includes a connecting rod and a locking assembly. The two ends of the connecting rod are respectively provided with tension grooves, one side of the tension groove is a tensioning slope, and the end of the connecting rod is a rod end face.

[0015] The locking assembly includes a locking housing with a locking groove inside. The locking groove is assembled with the locking slider portion of the locking block. The other end of the locking block has a locking bevel that can fit with the tensioning bevel. The locking block has a screw hole that is fitted onto one end of the locking block screw and is screwed into it. The other end of the locking block screw passes through the locking housing and is assembled therewith.

[0016] As a further improvement of this utility model, the connecting rod is also provided with a slot along its axial direction. The slot engages with and slides with the positioning block. The positioning block is hinged to the protrusion through a pin. The protrusion is installed on the valve body.

[0017] As a further improvement of this utility model, the assembly part also includes a stop assembly. The stop assembly is equipped with locking assemblies on both sides. The stop assembly includes a stop shell, a stop slider, and a stop rod. The stop shell is installed on the valve body and has a stop groove and an anti-rotation groove inside. A stop platform is installed in the stop groove. One end of the stop rod passes through the stop platform and is assembled with the stop slider. A spring is fitted on the part of the stop rod located between the stop platform and the stop slider.

[0018] As a further improvement of this utility model, an anti-rotation protrusion is installed at the corresponding position of the stop rod and the anti-rotation groove.

[0019] The beneficial effects of this utility model are:

[0020] This invention can be used to realize the differential and pressure relief combination function of actuators (such as hydraulic cylinders), enabling the actuators to operate at high speeds with low flow rates. When the differential pressure exceeds the set pressure, the differential operation stops, and the oil in the actuator is fully returned (to ports B and T), while the pressure at port A rises to its maximum (system pressure), also known as pressurization. This effectively balances operating speed, response speed, and efficient work output. Furthermore, the overall structure is very simple, highly integrated, and compact. Designed as a stacked intelligent module, it facilitates subsequent maintenance, installation, and troubleshooting.

[0021] The addition of the assembly part in this utility model not only maintains the existing technology of installing multiple stacked valves by passing screws through the mounting holes, but also allows adjacent stacked valves to be assembled and fixed by using connecting rods and locking blocks. This makes it very convenient and flexible to use. In particular, by using connecting rods and locking blocks for assembly, only the corresponding stacked valves need to be disassembled during subsequent maintenance, without the need for complete disassembly, resulting in high maintenance efficiency and low cost. Attached Figure Description

[0022] Figure 1 This is a hydraulic schematic diagram of this utility model;

[0023] Figure 2 This is a front view of the present invention;

[0024] Figure 3 This is a rear view of the present invention;

[0025] Figure 4 This is the left view of this utility model;

[0026] Figure 5 This is a top view of the present invention;

[0027] Figure 6 This is a structural schematic diagram of the addition of the assembly part of this utility model (a cross-sectional view at the center plane where the axis of the mounting hole 601 is located). Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] See Figure 1The superimposed combination differential valve of this embodiment is used to control the drive cylinder 400, including a pressure relief valve 100, a first check valve 200, a second check valve 300, and at least two ports A, B, B0, K, and Y. Each port A is connected to the others through a fifth oil passage 535. The cylinder 400 is divided into a rod chamber 401 and a rodless chamber 402. The rod chamber 401 is the side chamber on which the cylinder rod is installed. The rod chamber 401 and the rodless chamber 402 are respectively connected to port B0 and one of the ports A through a first oil pipe 501 and a second oil pipe 502.

[0030] The B0 port is connected to the oil inlet 1 of the pressure relief valve 100 through the first channel 511. The first channel 511 is connected to the inlet of the first check valve 200 through the second channel 512. The first outlet of the first check valve 200 is connected to the fifth oil passage 535 through the first connecting channel 521. The second outlet of the first check valve 200 is connected to the third connecting channel 523 through the second connecting channel 522. The B port is connected to the oil outlet 2 of the pressure relief valve through the fourth connecting channel 524. One end of the third connecting channel 523 is connected to the K port, and the other end is connected to the fourth connecting channel 524.

[0031] The first channel 511 is connected to the outlet of the second check valve 300 through the third channel 513, the third channel 513 is connected to the oil outlet 2 of the pressure relief valve 100 through the fourth channel 514, and the inlet of the second check valve 300 is connected to the fourth connecting channel 524 through the fifth channel 515.

[0032] The fifth oil passage 535 is connected to the pilot inlet 3 of the pressure relief valve 100 via the B3 oil passage, and the pilot outlet 4 of the pressure relief valve 100 is connected to the first oil passage 531 or the Y port via the B4 oil passage. There can be at least two Y ports, and multiple Y ports are connected to each other via the first oil passage 531.

[0033] The superimposed combination differential valve also includes a P port, a T port, and an X port. There can be at least two P ports, a T port, and an X port. Each P port is connected to the other through a second oil passage 532, each T port is connected to the other through a third oil passage 533, and each X port is connected to the other through a fourth oil passage 534. The T port is connected to the B port and is finally connected to the oil tank for oil return through an oil pipe.

[0034] When the cylinder shaft needs to extend, hydraulic oil is input through port A. The hydraulic oil enters the rodless chamber 402 through the second oil pipe 502, pushing the oil in the rod chamber 401 into port B0. At this time, since the pressure relief valve has not yet reached the opening pressure, the pressure relief valve remains closed. The oil in the rod chamber 401 enters the first check valve 200 through the second channel 512, and then partly enters the second connecting channel 522. It then enters the third oil channel 535 through the first connecting channel 521 and finally enters the rodless chamber 402, thereby driving the cylinder shaft to extend rapidly, achieving high-speed extension with a small flow rate. At the same time, the hydraulic oil entering the second connecting channel 522 enters the second check valve 300 through the third connecting channel 523 and the fourth connecting channel 524. After passing through the second check valve 300, it enters the third channel 513 to form back pressure on the rod chamber side, preventing the cylinder rod from going out of control and ensuring its smooth extension.

[0035] As the pressure difference between the rod chamber and the rodless chamber gradually increases, the oil pressure at port A rises. The hydraulic oil enters the pilot inlet 3 of the pressure relief valve through the B3 oil passage, opening the pressure relief valve. The pilot pressure relief oil is then input into the first oil passage 531 or output through the B4 oil passage and then through port Y.

[0036] After the pressure relief valve 100 is opened, the first channel 511, channel 514 and the fourth channel 524 are directly connected, that is, port B0 is directly connected to port B. At this time, the oil in the rod chamber 401 returns quickly, while the pressure in the rodless chamber rises to the maximum to perform work. By using the fourth channel 514 and the first channel 511 to return oil to the fourth connecting channel 524 at the same time, the oil return speed can be accelerated, thereby reducing the oil pressure in the rod chamber, which in turn reduces the oil pressure required in the rodless chamber, and thus reduces energy consumption.

[0037] When the cylinder rod needs to be reset, oil enters through port B and exits through port A. If the pressure relief valve is open, hydraulic oil quickly passes through the pressure relief valve and the second check valve and enters the rod chamber 401 to drive the cylinder rod to retract quickly. If the pressure relief valve is closed, hydraulic oil enters the rod chamber 401 after the second check valve is opened, and the hydraulic oil enters the outlet of the first check valve through the third connecting channel 523 and the second connecting channel to form back pressure, so as to prevent the first check valve from being opened, ensuring that the rod chamber enters quickly and the rodless chamber returns quickly.

[0038] In this embodiment, the back pressure of the Y port or the first oil passage 531 can be adjusted to adjust the opening pressure of the pressure relief valve.

[0039] The hydraulic cylinder in this embodiment is just a special case. This embodiment is applicable to actuators that require a combination of differential and pressure relief, and is not limited to hydraulic cylinders. In principle, it is suitable for scenarios where the differential action needs to be rapid at the beginning before work is performed. The actuator in this embodiment can also be a hydraulic motor. In this case, the rod chamber and rodless chamber can be replaced with the two oil ports of the hydraulic motor.

[0040] See Figures 2-5This is a schematic diagram of the mechanical structure of a stacked combination differential valve, including a valve body 600. The valve body 600 is provided with ports A, B, B0, T, P, X, Y, and K, as well as first channels 511 to fifth channels 515, first connecting channels 521 to fourth connecting channels 524, first oil passages 531 to fifth oil passages 535, oil passage B3, and oil passage B4. The valve body 600 is also provided with mounting holes 601, which are used to install the stacked combination differential valve. When there are multiple stacked valves, a screw can be passed through the mounting holes of all the stacked valves, and then nuts can be tightened on both sides.

[0041] See Figure 6 In practical applications, hydraulic systems often employ multiple stacked valves. This necessitates selecting the appropriate screw rod based on the total length of each mounting hole. However, subsequent adjustments to the number of stacked valves or changes in the overall mounting hole length require selecting a new screw rod of the appropriate length, which is extremely cumbersome. Especially during maintenance, the entire stacked valve system needs to be disassembled, which is not only time-consuming and labor-intensive but also increases costs and manpower.

[0042] In this embodiment, an assembly part is added, which includes a connecting rod 710, a stop assembly, and a locking assembly. The two ends of the connecting rod 700 are respectively provided with tension grooves 712, one side of the tension groove 712 is a tensioning inclined surface 7121, and the end of the connecting rod 710 is a rod end face 713.

[0043] A stop assembly is installed on the valve body 600. Locking assemblies are installed on both sides of the stop assembly. The stop assembly includes a stop housing 840, a stop slider 860, and a stop rod 850. The stop housing 840 is mounted on the valve body 600 and has a stop groove 843 and an anti-rotation groove 841 inside. A stop platform 842 is installed in the stop groove 843. One end of the stop rod 850 passes through the stop platform 842 and is assembled with the stop slider 860. A spring 801 is fitted on the portion of the stop rod 850 located between the stop platform 842 and the stop slider 860. The spring 801 applies a spring force to the stop slider 860, preventing it from moving towards the stop platform 842, so that the stop slider 860 remains stationary in its initial state. Figure 6 The state enters the mounting hole 601, obstructing the passage of the connecting rod 710.

[0044] The stop rod 850 is equipped with an anti-rotation protrusion 851 at the corresponding position of the anti-rotation groove 841. When unlocking is required, the anti-reverse slider 860 can be moved away from the mounting hole by pulling the stop rod 850 until the anti-reverse slider 860 exits the mounting hole and the anti-rotation protrusion 851 passes through the anti-rotation groove 841. Then, the stop rod 850 is rotated to cause the anti-rotation protrusion 851 to be misaligned with the anti-rotation groove 841. Then the stop rod 850 is released. Since the anti-rotation protrusion 851 cannot re-enter the stop groove 843, the anti-reverse slider 860 will remain in a state where it does not enter the mounting hole 601.

[0045] The locking assembly includes a locking housing 810, within which a locking groove 811 is provided. The locking groove 811 engages and slides with the locking slider portion 822 of the locking block 820, but cannot rotate relative to it. A locking inclined surface 823 is provided at the other end of the locking block 820, which can fit against a tensioning inclined surface 7121. A screw hole 821 is provided on the locking block 820, which is fitted onto one end of a locking block screw 830 and screwed into it. The other end of the locking block screw 830 protrudes from the locking housing 810 and can rotate relative to it, but cannot move relative to it axially. A hexagonal prism 831 is provided on the end of the locking block screw 830 protruding from the locking housing 810. Rotating the locking block screw 830 can cause the locking block 820 to move along its axial direction, thereby moving relative to the mounting hole 601.

[0046] Preferably, the connecting rod 710 is further provided with a groove 711 along its axial direction. The groove 711 engages with and slides with the positioning block 620. The positioning block 620 is hinged to the protrusion 610 via a pin 621. The protrusion 610 is mounted on the valve body 600. In this embodiment, Figure 6 The locking bolt 830 can be positioned on the side of the valve body, with the cross-section parallel to the top view direction, facilitating operation. The design of the slot 711 and the positioning block 620 is primarily for positioning the tensioning slot 712 and the locking block 820, ensuring the locking bevel 823 and the tensioning bevel 7121 are properly engaged. Furthermore, when the positioning block 620 is not needed, it can be rotated away from the mounting hole to avoid interfering with subsequent connection and assembly.

[0047] In the initial state, the stop slider 860 is in Figure 6The connecting rod 710 is then inserted, with its end face 713 pressed against the stop slider 860. During insertion, the positioning block 620 engages with the slot 711 to achieve positioning. The stop slider 860 is then pulled to the unlocked state (not entering the mounting hole). The locking block screw 830 is rotated via the hexagonal prism 831, driving the locking block 820 towards the mounting hole until the locking bevel 823 engages with the tensioning bevel 7121. The locking block 820 continues to move towards the mounting hole, applying a squeezing force to the connecting rod 710 towards the stop slider 860, thus securing the two stacked valves together via the connecting rod.

[0048] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0051] In this application, a circumferentially rotatable assembly is a connection assembly that can rotate relative to each other, such as an assembly using bearings; a circumferentially rotatable but axially movable assembly is one that can rotate relative to each other but cannot move axially, such as by installing shaft clips on both sides of the shaft and the mounting device to prevent the shaft from moving axially; a circumferentially rotatable and axially movable assembly is a movable assembly, such as an assembly where the shaft passes through a shaft hole; an assembly that cannot rotate circumferentially but can move axially can be an assembly using spline grooves or spline mating.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A stacked combination differential valve, used to drive actuators, characterized by: It includes a pressure relief valve, a first check valve, a second check valve, port A, port B, port B0, port K, and port Y, with port A connected to the fifth oil passage; the actuator includes a first oil port and a second oil port, with the first oil port and the second oil port connected to port B0 and port A, respectively; The B0 port is connected to the oil inlet of the pressure relief valve through the first channel, the first channel is connected to the inlet of the first check valve through the second channel, the first outlet of the first check valve is connected to the fifth oil passage through the first connecting channel; the B port is connected to the oil outlet of the pressure relief valve through the fourth connecting channel. The first channel is connected to the outlet of the second check valve through the third channel, the third channel is connected to the oil outlet of the pressure relief valve through the fourth channel, and the inlet of the second check valve is connected to the fourth connecting channel through the fifth channel. The fifth oil passage is connected to the pilot inlet of the pressure relief valve via the B3 oil passage, and the pilot outlet of the pressure relief valve is connected to the first oil passage or the Y port via the B4 oil passage.

2. The superimposed combined differential valve according to claim 1, characterized in that: The second outlet of the first one-way valve is connected to the third connection channel via the second connection channel. One end of the third connection channel is connected to port K, and the other end is connected to the fourth connection channel.

3. The superimposed combined differential valve according to claim 1 or 2, characterized in that: There are at least two ports A, and each port A is connected to the other via a fifth oil passage.

4. The superimposed combined differential valve according to claim 1 or 2, characterized in that: There are at least two Y ports, and each Y port is connected to the other via a first oil passage.

5. The superimposed combined differential valve according to claim 1 or 2, characterized in that: The superimposed combination differential valve also includes a P port, a T port, and an X port. There can be at least two P ports, a T port, and an X port. Each P port is connected to the others through a second oil passage, each T port is connected to the others through a third oil passage, and each X port is connected to the others through a fourth oil passage. The T port is connected to the B port.

6. The superimposed combined differential valve according to claim 1 or 2, characterized in that: It also includes a valve body, which is provided with ports A, B, B0, T, P, X, Y, and K, and also has mounting holes.

7. The superimposed combined differential valve according to claim 6, characterized in that: The valve body is also provided with an assembly part, which includes a connecting rod and a locking assembly. The two ends of the connecting rod are respectively provided with tension grooves, one side of the tension groove is a tensioning slope, and the end of the connecting rod is a rod end face. The locking assembly includes a locking housing with a locking groove inside. The locking groove is assembled with the locking slider portion of the locking block. The other end of the locking block has a locking bevel that can fit with the tensioning bevel. The locking block has a screw hole that is fitted onto one end of the locking block screw and is screwed into it. The other end of the locking block screw passes through the locking housing and is assembled therewith.

8. The superimposed combined differential valve according to claim 7, characterized in that: The connecting rod is also provided with a slot along its axial direction. The slot engages with and slides with the positioning block. The positioning block is hinged to the protrusion through a pin. The protrusion is mounted on the valve body.

9. The superimposed combined differential valve according to claim 7, characterized in that: The assembly also includes a stop assembly, with locking assemblies installed on both sides of the stop assembly. The stop assembly includes a stop housing, a stop slider, and a stop rod. The stop housing is installed on the valve body and has a stop groove and an anti-rotation groove inside. A stop platform is installed in the stop groove. One end of the stop rod passes through the stop platform and is assembled with the stop slider. A spring is fitted on the part of the stop rod located between the stop platform and the stop slider.

10. The superimposed combined differential valve according to claim 9, characterized in that: The stop rod is fitted with an anti-rotation protrusion at the corresponding position of the anti-rotation groove.

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