Speed increasing oil way of differential hydraulic cylinder

Abstract

The utility model discloses a differential hydraulic cylinder speed increasing oil way which comprises an oil cylinder, an oil tank, a first reversing valve, a third reversing valve, a hydraulic control one-way valve, a cartridge valve and a second reversing valve. By means of the hydraulic control one-way valve, when the oil cylinder conducts feeding speed-increasing motion, due to the fact that the hydraulic control one-way valve does not need to be switched through electric control, instant opening or closing can be achieved in the speed-increasing motion, and the oil cylinder is free of impact and smooth in motion in the speed-increasing motion.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic cylinder technical field, concretely relates to a differential hydraulic cylinder speed increasing oil circuit. BACKGROUND

[0002] The traditional differential hydraulic cylinder speed increasing oil circuit adds a directional valve between the rod cavity and the rodless cavity oil circuit of the oil cylinder, when the oil cylinder is in the feeding action, the directional valve changes the direction of the oil discharged from the rod cavity to the rodless cavity of the oil cylinder under the condition of being electrified, so that the oil discharged from the rod cavity and the pressure oil output by the pump flow together and enter the rodless cavity of the oil cylinder, thereby realizing the speed increasing movement, as shown in the figure. Figure 1 But in the actual application, due to the directional valve switching and delay, the oil cylinder has a larger impact when starting and ending the speed increasing, and the oil cylinder is not smooth in the feeding speed increasing movement, and the use effect is not good. UTILITY MODEL CONTENTS

[0003] In view of the defects of the prior art, the utility model aims at providing a differential hydraulic cylinder speed increasing oil circuit.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A differential hydraulic cylinder speed increasing oil circuit, comprising an oil cylinder, an oil tank, a reversing valve one, a reversing valve three, a hydraulic control check valve, a cartridge valve and a reversing valve two, the rodless cavity and the rod cavity of the oil cylinder are connected to two working oil ports of the reversing valve one, the oil inlet of the reversing valve one is connected to the pump, and the oil return port of the reversing valve one is connected to the lower oil port of the cartridge valve; the two working oil ports of the reversing valve one can switch the communication relationship between the oil inlet and the oil return port of the reversing valve one through the movement of the spool inside the reversing valve one;

[0006] The oil inlet of the hydraulic control check valve is connected to the oil circuit between the oil return port of the reversing valve one and the lower oil port of the cartridge valve, and the oil outlet of the hydraulic control check valve is connected to the rodless cavity of the oil cylinder;

[0007] One of the working oil ports of the reversing valve three is connected to the control oil circuit of the hydraulic control check valve, and the working oil port can switch the communication relationship between the oil inlet and the oil return port of the reversing valve three through the movement of the spool inside the reversing valve three; the oil inlet of the reversing valve three is connected to the pump, and the oil return port is connected to the oil tank;

[0008] The two working oil ports of the reversing valve two can switch the communication relationship between the oil inlet and the oil return of the reversing valve two through the movement of the spool in the reversing valve two; the oil inlet of the reversing valve two is connected to the upper control oil port of the cartridge valve, the side oil port of the cartridge valve and the oil return of the reversing valve two are connected to the oil tank; one of the working oil ports of the reversing valve two and the oil inlet are connected to the oil circuit between the oil inlet of the hydraulic control check valve and the lower oil port of the cartridge valve, and the other working oil port of the reversing valve two is connected to the oil tank.

[0009] Further, the reversing valve one is an O-shaped three-position four-way reversing electromagnetic valve.

[0010] Further, the reversing valve two is an M-shaped three-position four-way reversing electromagnetic valve.

[0011] Further, the reversing valve three is a two-position four-way electromagnetic valve.

[0012] Further, the hydraulic control check valve includes one or more, and when multiple hydraulic control check valves are used, the hydraulic control check valves are connected in parallel.

[0013] The utility model discloses the beneficial effect lies in: utilize the utility model, the oil cylinder in the feed speed -up movement, because the hydraulic control check valve does not need electric control switching, can realize instantaneous opening or closure in the speed -up movement, so the oil cylinder has no impact in the speed -up movement, and movement is smooth. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure schematic view of the existing differential hydraulic cylinder speed -up oil circuit;

[0015] Figure 2 It is the structure schematic view of the differential hydraulic cylinder speed -up oil circuit in the utility model embodiment. DETAILED DESCRIPTION

[0016] The utility model will be further described below in combination with the drawings, and it is to be explained that the embodiment takes the technical scheme as the premise, gives detailed implementation mode and specific operation process, but the protection scope of the utility model is not limited to the embodiment.

[0017] The embodiment provides a differential hydraulic cylinder speed -up oil circuit, which comprises a cartridge valve, a reversing valve one, a reversing valve two, a reversing valve three and a hydraulic control check valve. Figure 2As shown, including the oil cylinder, oil tank, O type three four-way reversing solenoid valve V1, two four-way solenoid valve V2, hydraulic control check valve (two hydraulic control check valve V3 and V3A in parallel in this embodiment), cartridge valve V4 and M type three four-way reversing solenoid valve V5; the rodless cavity and the rod cavity of the oil cylinder are connected to the working oil port A at the top left side and the working oil port B at the top right side of the O type three four-way reversing solenoid valve V1 respectively, the oil inlet P at the bottom left side of the O type three four-way reversing solenoid valve V1 is connected to the pump, and the oil return port T at the bottom right side of the O type three four-way reversing solenoid valve V1 is connected to the lower oil port of the cartridge valve V4;

[0018] The oil inlet of the hydraulic control check valve V3 and V3A is connected to the oil circuit between the oil return port T of the O type three four-way reversing solenoid valve V1 and the lower oil port of the cartridge valve V4, and the oil outlet of the hydraulic control check valve V3 and V3A is connected to the rodless cavity of the oil cylinder;

[0019] The working oil port B at the top right side of the two four-way solenoid valve V2 is connected to the control oil circuit of the hydraulic control check valve V3 and V3A, the oil inlet P at the bottom left side of the two four-way solenoid valve V2 is connected to the pump, and the oil return port T at the bottom right side is connected to the oil tank;

[0020] The oil inlet P at the bottom left side of the M type three four-way reversing solenoid valve V5 is connected to the upper control oil port X of the cartridge valve V4, and the side oil port of the cartridge valve V4 is connected to the oil tank; the oil return port T at the bottom right side of the M type three four-way reversing solenoid valve V5 is connected to the oil tank; the working oil port A at the top left side and the oil inlet P at the bottom left side of the M type three four-way reversing solenoid valve V5 are both connected to the oil circuit between the oil inlet of the hydraulic control check valve V3 and V3A and the lower oil port of the cartridge valve V4, and the working oil port B at the top right side of the M type three four-way reversing solenoid valve V5 is connected to the oil tank.

[0021] Specifically, in this embodiment, the O type three four-way reversing solenoid valve V1 is not limited to the flow size, mainly controls the feeding and returning movement of the oil cylinder. The hydraulic control check valve is not limited to the flow size, but due to the maximum flow limit of such valve, multiple hydraulic control check valves can be used in parallel according to the application needs, not limited to two shown in this embodiment, and the main function of the hydraulic control check valve is to control the oil discharge of the rod cavity of the oil cylinder into the rodless cavity, and when the oil cylinder returns, the two four-way solenoid valve V2 controls the opening to realize the reverse flow, quickly discharges the oil in the rodless cavity of the oil cylinder, so as to realize the quick return of the oil cylinder. The cartridge valve V4 is not limited to the flow size, which is controlled by the M type three four-way reversing solenoid valve V5 to switch, so as to determine whether the oil enters the rodless cavity of the oil cylinder or directly returns to the oil tank, thereby controlling the speed increasing movement or normal movement.

[0022] The working process of the differential hydraulic cylinder speed increasing oil circuit is as follows:

[0023] When the right side of the O-type three-position four-way reversing electromagnetic valve V1 and the right side of the M-type three-position four-way reversing electromagnetic valve V5 are energized and move left simultaneously, the oil cylinder moves at a feeding speed. At this time, the inlet P and the working oil port A of the O-type three-position four-way reversing electromagnetic valve V1 are connected, the return oil port T and the working oil port B are connected, and the inlet P and the working oil port A of the M-type three-position four-way reversing electromagnetic valve V5 are connected, and the return oil port T and the working oil port B are connected. The pump output pressure oil enters the rodless chamber of the oil cylinder through the inlet P and the working oil port A of the O-type three-position four-way reversing electromagnetic valve V1, and the oil discharged from the rod chamber of the oil cylinder is discharged through the working oil port B and the return oil port T of the O-type three-position four-way reversing electromagnetic valve V1. Because the inlet P and the working oil port A of the M-type three-position four-way reversing electromagnetic valve V5 are connected, the oil enters the upper control oil port X of the cartridge valve V4 from the working oil port A and the inlet P, so that the inlet of the cartridge valve V4 is in a closed state, and thus the oil discharged from the rod chamber of the oil cylinder cannot return to the tank through the cartridge valve V4, but can enter the rodless chamber of the oil cylinder through the hydraulic control check valves V3 and V3A. At this time, the pressure oil discharged from the pump and the oil discharged from the rod chamber of the oil cylinder are combined and enter the rodless chamber of the oil cylinder, so that the oil cylinder moves at an accelerated speed. Because the hydraulic control check valves V3 and V3A do not need to be controlled by electricity, they can be opened or closed instantaneously during the accelerated movement, so that the oil cylinder does not have impact during the accelerated movement, and moves smoothly.

[0024] When only the left side of the O-type three-position four-way reversing electromagnetic valve V1 is energized and moves right, the oil cylinder moves slowly in the return direction. At this time, the inlet P and the working oil port B of the O-type three-position four-way reversing electromagnetic valve V1 are connected, and the return oil port T and the working oil port A are connected. The pump output pressure oil enters the rod chamber of the oil cylinder through the inlet P and the working oil port B of the O-type three-position four-way reversing electromagnetic valve V1, and the oil discharged from the rodless chamber of the oil cylinder flows out from the working oil port A and the return oil port T of the O-type three-position four-way reversing electromagnetic valve V1, and returns to the tank through the inlet P and the return oil port T of the M-type three-position four-way reversing electromagnetic valve V5. Because the M-type three-position four-way reversing electromagnetic valve V5 is an electromagnetic directional valve, the flow rate is much smaller than the oil amount discharged from the rodless chamber of the oil cylinder, so that the oil cylinder moves slowly in the return direction to meet the condition that part of the oil cylinder needs to move slowly in the initial stage of the return.

[0025] When the reversing valve rod YA1 on the left side of the O-type three-position four-way reversing electromagnetic valve V1, the reversing valve rod YA4 on the left side of the M-type three-position four-way reversing electromagnetic valve V5 and the reversing valve rod YA3 on the left side of the two-position four-way electromagnetic valve V2 are simultaneously electrified and move right, the oil cylinder makes a fast retracting movement. The pressure oil output by the pump enters the rod cavity of the oil cylinder through the O-type three-position four-way reversing electromagnetic valve V1, and flows into the control oil paths of the hydraulic control check valves V3 and V3A through the oil inlet P and the working oil port B of the two-position four-way electromagnetic valve V2, so that the hydraulic control check valves V3 and V3A are reversely communicated. At this time, part of the oil discharged from the rodless cavity of the oil cylinder flows to the cartridge valve V4 through the working oil port A and the return oil port T of the O-type three-position four-way reversing electromagnetic valve V1, and the other part of the oil flows to the cartridge valve V4 through the reversely communicated hydraulic control check valves V3 and V3A. Since the working oil port B and the oil inlet P of the M-type three-position four-way reversing electromagnetic valve V5 are connected and the working oil port A and the return oil port T are connected at this time, the cartridge valve V4 is opened, and the oil discharged from the rodless cavity of the oil cylinder flows into the cartridge valve V4 from the lower oil port of the cartridge valve V4 after being converged in the cartridge valve V4, and flows out from the side oil port of the cartridge valve V4 to the oil tank.

[0026] Since the oil discharged from the rodless cavity of the oil cylinder can be converged through V1 and the hydraulic control check valve V4, the selection of the O-type three-position four-way reversing electromagnetic valve V1 only needs to meet the maximum flow rate of the pump output, and does not need to be selected according to the maximum oil amount discharged from the rodless cavity when the oil cylinder makes a fast retracting movement, so that the cost can be reduced.

[0027] For those skilled in the art, various corresponding changes and modifications can be given according to the above technical solutions and concepts, and all these changes and modifications should be included in the protection scope of the utility model claim.

Claims

1. A differential hydraulic cylinder speed-up oil passage characterized by comprising: The hydraulic cylinder, the oil tank, the reversing valve one, the reversing valve three, the hydraulic control check valve, the cartridge valve and the reversing valve two are included; the rodless cavity and the rod cavity of the hydraulic cylinder are connected to two working oil ports of the reversing valve one respectively, the oil inlet of the reversing valve one is connected to the pump, and the oil return port of the reversing valve one is connected to the lower oil port of the cartridge valve; the two working oil ports of the reversing valve one can switch the communication relationship between the oil inlet and the oil return port of the reversing valve one through the movement of the spool in the reversing valve one; The oil inlet of the hydraulic control check valve is connected to the oil circuit between the oil return port of the reversing valve one and the lower oil port of the cartridge valve, and the oil outlet of the hydraulic control check valve is connected to the rodless cavity of the hydraulic cylinder; One of the working oil ports of the reversing valve three is connected to the control oil circuit of the hydraulic control check valve, and the working oil port can switch the communication relationship between the oil inlet and the oil return port of the reversing valve three through the movement of the spool in the reversing valve three; the oil inlet of the reversing valve three is connected to the pump, and the oil return port is connected to the oil tank; The two working oil ports of the reversing valve two can switch the communication relationship between the oil inlet and the oil return port of the reversing valve two through the movement of the spool in the reversing valve two; the oil inlet of the reversing valve two is connected to the upper control oil port of the cartridge valve, the side oil port of the cartridge valve and the oil return port of the reversing valve two are connected to the oil tank; one of the working oil ports and the oil inlet of the reversing valve two are connected to the oil circuit between the oil inlet of the hydraulic control check valve and the lower oil port of the cartridge valve, and the other working oil port of the reversing valve two is connected to the oil tank.

2. The differential hydraulic cylinder overhauling oil passage according to claim 1, characterized by, The reversing valve one is an O-type three-position four-way reversing electromagnetic valve.

3. The differential hydraulic cylinder over gear oil passage according to claim 1, characterized by, The reversing valve two is an M-type three-position four-way reversing electromagnetic valve.

4. The differential hydraulic cylinder over gear oil passage according to claim 1, characterized by, The reversing valve three is a two-position four-way electromagnetic valve.

5. The differential hydraulic cylinder over gear oil passage of claim 1 wherein, The hydraulic control check valve includes one or more, and when multiple hydraulic control check valves are used, the hydraulic control check valves are connected in parallel.

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