Continuously variable supercharging loop

Abstract

The utility model relates to the technical field of hydraulic pressure, and discloses a continuously variable supercharging loop which comprises an oil cylinder, a pressure oil supply pipeline and an oil tank, the pressure oil supply pipeline is communicated with the oil cylinder through an oil inlet pipeline, and the oil tank is communicated with the oil cylinder through an oil return pipeline; wherein the oil inlet pipeline is provided with a constant displacement motor and a variable displacement motor, an oil inlet of the constant displacement motor and an oil inlet of the variable displacement motor are both communicated with the pressure oil supply pipeline, an oil outlet of the variable displacement motor is connected with the oil tank, and an oil outlet of the constant displacement motor is communicated with the oil cylinder. According to the continuous variable supercharging loop, stepless change of supercharging flow and stepless change of supercharging ratio can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pressure, in particular to a continuously variable boosting circuit. Background Art

[0002] At present, in order to increase the working pressure of the master cylinder of the hydraulic press, the following two pressurization methods are generally used to provide pressure oil to the master cylinder. One is to use oil cylinder pressurization, and the other is to use multi-motor pressurization.

[0003] Among them, oil cylinder boosting is divided into fixed boosting and reciprocating boosting. Fixed boosting has a simple structure, but the boosting stroke is single, the boosting ratio is single, the structure is bulky, and the compatibility is poor; reciprocating boosting has pressure fluctuations or pauses, which makes it unusable for equipment with higher requirements; in addition, once the boosting cylinder of these two oil cylinder boosting is determined, the boosting ratio cannot be changed.

[0004] Multi-motor parallel boosting can achieve two functions: continuous boosting and adjustable boost ratio. However, the cost is very high and it requires multiple valves and motors to work together, making the electrical control complex. Although multiple boost ratios can be combined in theory, it is difficult to achieve infinitely adjustable boost ratio and boost flow.

[0005] Therefore, it is necessary to improve the existing oil cylinder boosting structure to achieve stepless change of boosting flow rate and stepless change of boosting ratio. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a continuously variable boosting circuit, which can realize stepless change of boosting flow rate and stepless change of boosting ratio.

[0007] In order to solve the above technical problems, the utility model provides a continuously variable boosting circuit, comprising an oil cylinder, a pressure oil supply pipeline and an oil tank, wherein the pressure oil supply pipeline is connected to the oil cylinder through an oil inlet pipeline, and the oil tank is connected to the oil cylinder through an oil return pipeline;

[0008] Among them, the oil inlet pipeline is provided with a fixed-displacement motor and a variable-displacement motor, the oil inlet of the fixed-displacement motor and the oil inlet of the variable-displacement motor are both connected to the pressure oil supply pipeline, the oil outlet of the variable-displacement motor is connected to the oil tank, and the oil outlet of the fixed-displacement motor is connected to the oil cylinder.

[0009] As an improvement of the above solution, the oil cylinder is provided with a displacement sensor, and the displacement sensor is electrically connected to the variable motor.

[0010] As an improvement of the above solution, the oil cylinder is provided with a pressure sensor, and the pressure sensor is electrically connected to the variable motor.

[0011] As an improvement of the above scheme, the oil inlet pipeline includes a rodless chamber oil inlet pipeline connected to the rodless chamber of the cylinder, and a rod chamber oil inlet pipeline connected to the rod chamber of the cylinder, and the fixed-quantity motor and the variable-variable motor are both arranged on the rodless chamber oil inlet pipeline.

[0012] As an improvement of the above solution, the rodless chamber oil inlet pipeline is provided with a first ultra-high pressure dynamic valve and a second ultra-high pressure dynamic valve, the first ultra-high pressure dynamic valve is connected in series with the quantitative motor, and the second ultra-high pressure dynamic valve is connected in parallel with the quantitative motor;

[0013] The rod chamber oil inlet pipeline is provided with a first two-way cartridge valve.

[0014] As an improvement of the above solution, the oil return pipeline includes a rodless chamber oil return pipeline connected to the rodless chamber of the oil cylinder, and a rod chamber oil return pipeline connected to the rod chamber of the oil cylinder;

[0015] The rodless chamber oil return pipeline is provided with a third ultra-high pressure dynamic valve, and the rod chamber oil return pipeline is provided with a second two-way cartridge valve.

[0016] As an improvement of the above solution, the rod chamber oil return pipeline is further provided with a safety valve, and the oil outlet of the safety valve is communicated with the oil tank.

[0017] As an improvement of the above solution, the second two-way cartridge valve is provided with a manual adjustment rod for adjusting the moving speed of the cylinder rod.

[0018] As an improvement of the above scheme, it also includes a functional control oil circuit, which includes a first two-position four-way solenoid reversing valve, a second two-position four-way solenoid reversing valve, a third two-position four-way solenoid reversing valve, a three-position four-way solenoid reversing valve, and a shuttle valve.

[0019] As an improvement of the above solution, the variable motor is an electric proportional variable motor with electric proportional control displacement, and the fixed displacement motor and the variable motor are connected at the shaft ends through the coupling.

[0020] The implementation of this utility model has the following beneficial effects:

[0021] The utility model discloses a continuously variable supercharging circuit, which adopts a quantitative motor connected in parallel with a variable motor. By changing the displacement of the variable motor, stepless changes in supercharging flow and supercharging ratio can be achieved. The continuously variable supercharging circuit has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of an embodiment of a continuously variable boost circuit of the utility model;

[0023] Figure 2 yes Figure 1 Schematic diagram of the structure of the fixed motor and variable motor;

[0024] Figure 3 yes Figure 1 Structural diagram of the medium and ultra-high pressure dynamic valve;

[0025] Figure 4 yes Figure 1 Schematic diagram of the structure of the two-way cartridge valve. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2 As shown, the utility model discloses an embodiment of a continuously variable supercharging circuit, comprising an oil cylinder 16, a pressure oil supply pipeline and an oil tank, wherein the pressure oil supply pipeline is connected to the oil cylinder 16 through an oil inlet pipeline, and the oil tank is connected to the oil cylinder 16 through an oil return pipeline; wherein the oil inlet pipeline is provided with a fixed-displacement motor 1 and a variable-displacement motor 3, wherein the first oil inlet port 101 of the fixed-displacement motor 1 and the second oil inlet port 31 of the variable-displacement motor 3 are both connected to the pressure oil supply pipeline, the second oil outlet port 32 of the variable-displacement motor 3 is connected to the oil tank, and the first oil outlet port 102 of the fixed-displacement motor 1 is connected to the oil cylinder 16.

[0028] Among them, the pressure oil supply pipeline provides pressure oil with a pressure of P0 and a flow rate of Q0. The pressure oil delivered to the oil cylinder 16 through the quantitative motor 1 has a pressure of P1 and a flow rate of Q1. The pressure oil output to the oil tank through the variable motor 3 has a pressure of P2 and a flow rate of Q2. Ignoring energy loss and internal leakage, Q0*P0=Q1*P1+Q2*P2, Q0=Q1+Q2. At the same time, the oil pressure P2 output by the variable motor 3 to the oil tank is 0, and the pressure increase ratio is P1 / P0=(Q1+Q2) / Q1.

[0029] The variable motor 3 of this embodiment is an electric proportional variable motor 3 with electric proportional control displacement. The fixed motor 1 and the variable motor 3 are connected at the shaft end through the coupling 2. The output flow Q2 of the variable motor 3 can be changed by changing the control voltage or control current of the variable motor 3, thereby realizing continuous adjustable pressure ratio.

[0030] In this embodiment, the pressure oil provided to the cylinder 16 is pressurized by the quantitative motor 1, and the pressurized flow rate = Q1, Q1 = Q0-Q2. The output flow rate Q2 of the variable motor 3 can be changed by changing the control voltage or control current of the variable motor 3, thereby realizing continuous adjustment of the pressurized flow rate.

[0031] In this embodiment, a fixed displacement motor 1 is connected in parallel with an electric proportional variable displacement motor 3, and the boost flow rate and the boost ratio can be varied steplessly by changing the displacement of the variable displacement motor 3.

[0032] In this embodiment, the oil cylinder 16 is preferably provided with a displacement sensor 17 , and the displacement sensor 17 is electrically connected to the variable motor 3 , so as to realize closed-loop control of the boost speed.

[0033] In addition, in this embodiment, the oil cylinder 16 is preferably provided with a pressure sensor (not shown in the figure), the pressure sensor is connected to the rodless chamber of the oil cylinder 16, and the pressure sensor is electrically connected to the variable motor 3, so that the closed-loop control of the boost pressure of the oil cylinder 16 is realized through pressure feedback.

[0034] The oil inlet pipeline specifically includes a rodless chamber oil inlet pipeline connected to the rodless chamber of the oil cylinder 16, and a rod chamber oil inlet pipeline connected to the rod chamber of the oil cylinder 16. The oil return pipeline includes a rodless chamber oil return pipeline connected to the rodless chamber of the oil cylinder 16, and a rod chamber oil return pipeline connected to the rod chamber of the oil cylinder 16.

[0035] The fixed-displacement motor 1 and the variable-displacement motor 3 are both arranged on the rodless chamber oil inlet pipeline. The rodless chamber oil inlet pipeline is provided with a first ultra-high pressure dynamic valve 4 and a second ultra-high pressure dynamic valve 6, the first ultra-high pressure dynamic valve 4 is connected in series with the fixed-displacement motor 1, and the second ultra-high pressure dynamic valve 6 is connected in parallel with the fixed-displacement motor 1; the rodless chamber oil return pipeline is provided with a third ultra-high pressure dynamic valve 8.

[0036] It should be noted that the ultra-high pressure described in this embodiment generally refers to a pressure higher than 100 MPa. The ultra-high pressure dynamic valve described in this embodiment can have a hydraulic system with a working pressure of up to 100 MPa, while the control pressure only needs to be below 20 MPa, and can be controlled by an ordinary pilot solenoid valve, so the cost and control difficulty of the hydraulic system are low.

[0037] Specifically, combined Figure 3The first ultra-high pressure dynamic valve 4, the second ultra-high pressure dynamic valve 6, and the third ultra-high pressure dynamic valve 8 are all provided with a valve opening control oil port a, a valve closing control oil port b, and at least two first working oil ports c. One of the first working oil ports c of the first ultra-high pressure dynamic valve 4 is connected to the first oil inlet 101 of the fixed-measuring motor 1 and the second oil inlet 31 of the variable motor 3. The other first working oil port c of the first ultra-high pressure dynamic valve 4 is connected to the pressure oil supply pipeline. The first oil outlet 102 of the fixed-measuring motor 1 is connected to the rodless cavity of the cylinder 16, and the second oil outlet 32 ​​of the variable motor 3 is connected to the oil tank; one of the first working oil ports c of the second ultra-high pressure dynamic valve 6 is connected to the rodless cavity of the cylinder 16 and one of the first working oil ports c of the third ultra-high pressure dynamic valve 8, and the other working oil of the second ultra-high pressure dynamic valve 6 is connected to the pressure oil supply pipeline.

[0038] The rod chamber oil inlet pipeline is provided with a first two-way cartridge valve 10, and the rod chamber oil return pipeline is provided with a second two-way cartridge valve 11. Figure 4 The first two-way cartridge valve 10 and the second two-way cartridge valve 11 are both provided with a control oil port d and two second working oil ports e. One of the second working oil ports e of the first two-way cartridge valve 10 is connected to the pressure oil supply pipeline, one of the second working oil ports e of the second two-way cartridge valve 11 is connected to the oil tank, and the other second working oil port e of the first two-way cartridge valve 10 is connected to the rod chamber of the oil cylinder 16 and the other second working oil port e of the second two-way cartridge valve 11.

[0039] In this embodiment, the cover plate of the second two-way cartridge valve 11 is provided with a manual adjustment rod, which can adjust the downward speed of the cylinder 16 according to actual conditions.

[0040] Preferably, the rod chamber oil return pipeline is further provided with a safety valve 15 to help quickly release pressure, the oil inlet of the safety valve 15 is connected to the rod chamber of the oil cylinder 16, and the oil outlet of the safety valve 15 is connected to the oil tank.

[0041] The continuously variable boosting circuit of this embodiment controls the oil inlet and oil return of the rod chamber in the oil cylinder 16 and the oil inlet and oil return of the rodless chamber in the oil cylinder 16 through the functional control oil circuit. The functional control oil circuit specifically includes a first two-position four-way electromagnetic reversing valve 5, a second two-position four-way electromagnetic reversing valve 7, a third two-position four-way electromagnetic reversing valve 9, a three-position four-way electromagnetic reversing valve 12, and a shuttle valve 13. The working process of the continuously variable boosting circuit of this embodiment is as follows:

[0042] The downward process of the oil cylinder 16 is as follows:

[0043] The electromagnetic coil YV2 of the second two-position four-way electromagnetic reversing valve 7 and the electromagnetic coil YV5 of the three-position four-way electromagnetic reversing valve 12 are energized, and under the action of the control oil, the second ultra-high pressure dynamic valve 6 opens, and the pressure oil enters the rodless chamber of the cylinder 16 through the second ultra-high pressure dynamic valve 6; under the action of the control oil, the second two-way cartridge valve 11 opens, and the rod chamber oil of the cylinder 16 returns to the oil tank through the second two-way cartridge valve 11, and the cylinder 16 realizes the downward action.

[0044] The pressurization process of cylinder 16 is as follows:

[0045] The electromagnetic coil YV1 of the first two-position four-way electromagnetic reversing valve 5 and the electromagnetic coil YV5 of the three-position four-way electromagnetic reversing valve 12 are energized. Under the action of the control oil, the first ultra-high pressure dynamic valve 4 is opened, and the pressure oil enters the first oil inlet 101 of the quantitative motor 1 and the second oil inlet 31 of the variable motor 3 through the first ultra-high pressure dynamic valve 4. The pressurized pressure oil enters the rodless chamber of the cylinder 16 through the quantitative motor 1. Ignoring energy loss and internal leakage, Q0*P0=Q1*P1+Q2*P2 and Q0=Q1+Q2. Since the second oil outlet 32 ​​of the variable motor 3 is connected to the oil tank, P2=0, then P1 / P0=(Q1+ Q2) / Q1, continuous motor boost can be achieved, and the boost ratio is (Q1+Q2) / Q1; the rodless chamber of the cylinder 16 is provided with a pressure sensor, and the control voltage or control current of the variable motor 3 is controlled by the pressure feedback from the pressure sensor to achieve closed-loop control of the boost pressure; the cylinder 16 is provided with a displacement sensor 17, and the control voltage or control current of the variable motor 3 is controlled by the displacement change feedback from the displacement sensor 17 to achieve closed-loop control of the boost speed; under the action of the control oil, the second two-way cartridge valve 11 is opened, and the rod chamber oil of the cylinder 16 returns to the oil tank through the second two-way cartridge valve 11, and the cylinder 16 achieves continuously variable boost action.

[0046] The upward movement process of the oil cylinder 16 is as follows:

[0047] The electromagnetic coil YV3 of the third two-position four-way electromagnetic reversing valve 9 and the electromagnetic coil YV4 of the three-position four-way electromagnetic reversing valve 12 are energized, and under the action of the control oil, the first two-way cartridge valve 10 opens, and the pressure oil enters the rod chamber of the cylinder 16 through the first two-way cartridge valve 10; under the action of the control oil, the third ultra-high pressure dynamic valve 8 opens, and the rodless chamber oil of the cylinder 16 returns to the oil tank through the third ultra-high pressure dynamic valve 8, and the cylinder 16 realizes an upward action.

[0048] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A continuously variable boost circuit, characterized in that: It includes an oil cylinder, a pressure oil supply pipeline and an oil tank, wherein the pressure oil supply pipeline is connected to the oil cylinder through an oil inlet pipeline, and the oil tank is connected to the oil cylinder through an oil return pipeline; Among them, the oil inlet pipeline is provided with a fixed-displacement motor and a variable-displacement motor, the oil inlet of the fixed-displacement motor and the oil inlet of the variable-displacement motor are both connected to the pressure oil supply pipeline, the oil outlet of the variable-displacement motor is connected to the oil tank, and the oil outlet of the fixed-displacement motor is connected to the oil cylinder.

2. The continuously variable supercharging circuit according to claim 1, characterized in that: The oil cylinder is provided with a displacement sensor, and the displacement sensor is electrically connected to the variable motor.

3. The continuously variable supercharging circuit according to claim 1 or 2, characterized in that: The oil cylinder is provided with a pressure sensor, and the pressure sensor is electrically connected to the variable motor.

4. The continuously variable supercharging circuit according to claim 1, characterized in that: The oil inlet pipeline includes a rodless chamber oil inlet pipeline connected to the rodless chamber of the oil cylinder and a rod chamber oil inlet pipeline connected to the rod chamber of the oil cylinder. The fixed displacement motor and the variable displacement motor are both arranged on the rodless chamber oil inlet pipeline.

5. The continuously variable supercharging circuit according to claim 4, characterized in that: The rodless chamber oil inlet pipeline is provided with a first ultra-high pressure dynamic valve and a second ultra-high pressure dynamic valve, the first ultra-high pressure dynamic valve is connected in series with the quantitative motor, and the second ultra-high pressure dynamic valve is connected in parallel with the quantitative motor; The rod chamber oil inlet pipeline is provided with a first two-way cartridge valve.

6. The continuously variable supercharging circuit according to claim 1, characterized in that: The oil return pipeline includes a rodless chamber oil return pipeline connected to the rodless chamber of the oil cylinder, and a rod chamber oil return pipeline connected to the rod chamber of the oil cylinder; The rodless chamber oil return pipeline is provided with a third ultra-high pressure dynamic valve, and the rod chamber oil return pipeline is provided with a second two-way cartridge valve.

7. The continuously variable supercharging circuit according to claim 6, characterized in that: The rod chamber oil return pipeline is also provided with a safety valve, and the oil outlet of the safety valve is communicated with the oil tank.

8. The continuously variable supercharging circuit according to claim 6, characterized in that: The second two-way cartridge valve is provided with a manual adjustment rod for adjusting the moving speed of the oil cylinder rod.

9. The continuously variable supercharging circuit according to claim 1, characterized in that: It also includes a function control oil circuit, which includes a first two-position four-way electromagnetic reversing valve, a second two-position four-way electromagnetic reversing valve, a third two-position four-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve, and a shuttle valve.

10. The continuously variable supercharging circuit according to claim 1, characterized in that: The variable motor is an electric proportional variable motor with electric proportional control displacement, and the fixed displacement motor and the variable motor are connected at the shaft ends via a coupling.

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