Speed ​​double closed loop control oil circuit

Abstract

The present invention discloses a speed dual closed-loop control oil circuit, including an injection oil cylinder, an oil tank, an oil pump, a fast accumulator, an oil pipeline with a plurality of electric control valves and a control unit. The internal cavity of the injection oil cylinder includes a boost rodless cavity with a boost inlet, a boost rod cavity with a boost outlet, a shot rodless cavity with an injection inlet, and a shot rod cavity with a first injection outlet and a second injection outlet. The electric control valves in the oil pipeline are all electrically connected to the control unit. The oil pipeline includes an inlet closed-loop control pipeline, an outlet closed-loop control pipeline, a differential pipeline, a boost control pipeline, a boost front chamber return oil pipeline, an accumulator control pipeline, a hammer front control pipeline and a hammer return pipeline. The present invention solves the problems of slow jitter and excessive rapid impact, and the injection speed is more uniform, the acceleration is stable, the injection speed is faster, the speed control is more precise, and the terminal braking can be effectively achieved.

Description

Technical Field

[0001] The invention relates to the technical field of die-casting machines, and in particular to a speed double closed-loop control oil circuit. Background Art

[0002] The current industry has increasingly higher requirements for the technical parameters of die-casting machines, especially for the injection speed, which can be as low as 0.02m / s and as high as 10m / s, and the higher the speed accuracy, the better.

[0003] For slow speed control, the open-loop control currently used is prone to jitter. In order to improve this defect, a single closed-loop control is generally designed at the outlet. When the inlet is adjusted to a certain value, the slow speed jitter is significantly improved, but the disadvantage is that the inlet is not convenient for process adjustment.

[0004] For rapid control, the acceleration required to increase the speed from 0.5m / s to 10m / s in a short time and short distance is very large, and the impact will also increase synchronously. Therefore, at the end of the injection, the impact is large and the back pressure is high, which affects the braking effect and makes the braking effect not obvious, resulting in excessive impact of the piston on the mold, which is easy to cause product flash, affect the yield rate, and also shorten the service life of the mold. Summary of the invention

[0005] The present invention proposes a speed double closed-loop control oil circuit to solve the above technical problems.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A speed dual closed-loop control oil circuit comprises an injection oil cylinder, an oil tank, an oil pump, a fast accumulator A1, an oil pipeline with a plurality of electric control valves and a control unit, wherein the internal cavity of the injection oil cylinder comprises a boost rodless cavity with a boost inlet, a boost rod cavity with a boost outlet, an injection rodless cavity with an injection inlet, and an injection rod cavity with a first injection outlet and a second injection outlet, and the electric control valves in the oil pipeline are all electrically connected to the control unit; the oil pipeline comprises: an inlet closed-loop control pipeline connecting the fast accumulator A1 and the injection inlet, An outlet closed-loop control pipeline connecting the first injection outlet and the oil tank, a differential pipeline connecting the second injection outlet and the fast accumulator A1, a boost control pipeline connecting the boost inlet and the fast accumulator A1, a boost front chamber oil return pipeline connecting the boost outlet and the oil tank, an accumulator control pipeline connecting the oil pump and the fast accumulator A1, a hammer front control pipeline connecting the oil pump and the injection inlet, and a hammer return pipeline connecting the oil pump and the injection outlet; dual closed-loop control of the inlet and outlet speeds of the injection cylinder is achieved through the control unit, the outlet closed-loop control pipeline and the inlet closed-loop control pipeline.

[0008] Preferably, the injection outlet is connected to a pressure sensor R1 and / or a pressure gauge B1; the injection inlet is connected to a pressure sensor R2 and / or a pressure gauge B2; the nitrogen charging port of the fast accumulator is connected to a pressure sensor R3 and / or a pressure gauge B3; the pressure sensor R1, the pressure sensor R2, and the pressure sensor R3 are all electrically connected to the control unit.

[0009] Preferably, the hammer front control pipeline includes a manual hammer front valve V3, a hammer front control valve V5, a shuttle valve V6, a high-pressure stop valve V11, a high-pressure stop control valve V12, and a pressure-injection safety valve V13; the return hammer pipeline includes a return hammer control valve V1, a return hammer valve V2, a return hammer oil return valve V4 and a return hammer check valve V18; one end of the manual hammer front valve V3, one end of the return hammer valve V2, and one end of the shuttle valve V6 are all connected to the oil pump, one end of the return hammer oil return valve V4, and one end of the pressure-injection safety valve V13 are all connected to the oil tank, the other end of the manual hammer front valve V3 and the other end of the return hammer oil return valve V4 are all connected to one end of the high-pressure stop valve V11, and the high-pressure stop valve V11 The other end of the shuttle valve V6 and the other end of the injection safety valve V13 are connected to the injection inlet, the other end of the shuttle valve V6 is connected to one end of the hammer front control valve V5 and one end of the return hammer control valve V1, one end of the return hammer check valve V18 is connected to the injection outlet, and the other end of the return hammer valve V2 is connected to the other end of the return hammer check valve V18; the hammer front control valve V5, the high-pressure cut-off control valve V12, the return hammer control valve V1, and the injection safety valve V13 are electrically connected to the control unit respectively, the hammer front control valve V5 controls the switch of the manual hammer front valve V3 and the return hammer oil return valve V4, the high-pressure cut-off control valve V12 controls the switch of the high-pressure cut-off valve V11, and the return hammer control valve V1 controls the switch of the return hammer valve V2.

[0010] Preferably, the accumulator control pipeline includes an accumulator valve V9, an accumulator control valve V10 and an accumulator oil discharge valve V8, the accumulator control valve V10 and the accumulator oil discharge valve V8 are electrically connected to the control unit respectively, the accumulator control valve V10 controls the switch of the accumulator valve V9, one end of the accumulator valve V9 is connected to the oil pump and one end of the shuttle valve V6, one end of the accumulator oil discharge valve V8 is connected to the oil tank, and the other end of the accumulator valve V9 and the other end of the accumulator oil discharge valve V8 are both connected to the fast accumulator A1.

[0011] Preferably, the outlet closed-loop control pipeline includes a quick-discharge proportional valve V17 and a pilot accumulator A2. The quick-discharge proportional valve V26 is electrically connected to the control unit. The two ends of the quick-discharge proportional valve V17 are respectively connected to the first injection outlet and the oil tank. The pilot accumulator A2 is connected to the outlet of the quick-discharge proportional valve V17.

[0012] Preferably, the inlet closed-loop control pipeline includes a fast proportional valve V26, which is electrically connected to the control unit, and both ends of the fast proportional valve V26 are respectively connected to the fast accumulator and the injection inlet.

[0013] Preferably, the differential pipeline includes a differential valve V27, and two ends of the differential valve V27 are respectively connected to the second injection outlet and the fast accumulator A1.

[0014] Preferably, the boost control pipeline includes a pilot accumulator A3, a boost proportional valve V23, and a boost proportional safety valve V25; one end of the boost proportional valve V23 is connected to the fast accumulator A1, the other end of the boost proportional valve V23 is connected to the boost inlet, one end of the pilot oil of the boost proportional valve V23 is connected to one end of the boost proportional safety valve V25, the pilot accumulator A3 is connected to the other end of the boost proportional safety valve V25, and the boost proportional valve V23 and the boost proportional safety valve V25 are electrically connected to the control unit respectively.

[0015] Preferably, the boost control pipeline further includes a boost safety valve V22, which is electrically connected to the control unit, and both ends of the boost safety valve V22 are connected to the boost inlet and the high-pressure cut-off control valve V12 respectively.

[0016] Preferably, the boost front chamber oil return pipeline includes a boost oil return valve V19 and a boost oil return control valve V20, the two ends of the boost oil return valve V19 are respectively connected to the boost outlet and the oil tank, the boost oil return control valve V20 is electrically connected to the control unit, one end of the boost oil return control valve V20 is connected to the other end of the shuttle valve V6, and the boost oil return control valve V20 controls the switch of the boost oil return valve V19.

[0017] Preferably, the oil delivery pipeline also includes a boost reset filling pipeline connecting the boost outlet and the fuel tank, and the boost reset filling pipeline includes a boost aftertaste filling valve V14 connecting the boost outlet and the fuel tank.

[0018] Preferably, the oil delivery pipeline further includes a boost reset oil return pipeline connecting the boost inlet and the fuel tank, and the boost reset oil return pipeline includes a boost reset oil return valve V21 connecting the boost inlet and the fuel tank.

[0019] Preferably, an air filter is also included, and the air filter is connected to the fuel tank.

[0020] Preferably, an oil filter is further included, one end of which is connected to the fast accumulator A1, and the other end of which is connected to a one-way valve.

[0021] Compared with the prior art, the present invention solves the problems of slow jitter and excessive rapid impact, the injection speed is more uniform, the acceleration is stable, the injection speed is faster, the speed control is more precise and accurate, and the terminal braking can be effectively achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1The figure is a schematic diagram of the structure of the speed dual closed-loop control oil circuit of the present invention.

[0023] In the figure, 1-injection oil cylinder, 2-oil tank, 3-oil pump, 11-boost rodless chamber, 12-boost rod chamber, 13-injection rodless chamber, 14-injection rod chamber. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0025] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0026] like Figure 1 As shown, a speed dual closed-loop control oil circuit includes an injection oil cylinder 1, an oil tank 2, an oil pump 3, a fast accumulator A1, an oil pipeline with a plurality of electric control valves and a control unit, wherein the internal cavity of the injection oil cylinder 1 includes a boost rodless cavity 11 with a boost inlet, a boost rod cavity 12 with a boost outlet, an injection rodless cavity 13 with an injection inlet, and an injection rod cavity 14 with a first injection outlet and a second injection outlet, and the electric control valves in the oil pipeline are all electrically connected to the control unit.

[0027] The oil delivery pipeline includes: an inlet closed-loop control pipeline connecting the fast accumulator A1 and the injection inlet, an outlet closed-loop control pipeline connecting the first injection outlet and the oil tank 2, a differential pipeline connecting the second injection outlet and the fast accumulator A1, a boost control pipeline connecting the boost inlet and the fast accumulator A1, a boost front chamber oil return pipeline connecting the boost outlet and the oil tank 2, a boost reset filling pipeline connecting the boost outlet and the oil tank 2, a boost reset oil return pipeline connecting the boost inlet and the oil tank 2, an accumulator control pipeline connecting the oil pump 3 and the fast accumulator A1, a hammer front control pipeline connecting the oil pump 3 and the injection inlet, and a hammer return pipeline connecting the oil pump 3 and the injection outlet. Through the control unit, the outlet closed-loop control pipeline and the inlet closed-loop control pipeline, the double closed-loop control of the inlet and outlet speeds of the injection cylinder is realized.

[0028] The injection outlet is connected to a pressure sensor R1 and / or a pressure gauge B1 for detecting the pressure value of the injection outlet; the injection inlet is connected to a pressure sensor R2 and / or a pressure gauge B2 for detecting the pressure value of the injection inlet; the nitrogen charging port of the fast accumulator is connected to a pressure sensor R3 and / or a pressure gauge B3 for detecting the pressure value of the nitrogen charging port of the fast accumulator. The pressure sensors R1, R2 and R3 are all electrically connected to the control unit and transmit the detected pressure value data to the control unit.

[0029] The front-hammer control pipeline includes a manual hammer front valve V3, a hammer front control valve V5, a shuttle valve V6, a high-pressure stop valve V11, a high-pressure stop control valve V12, and a pressure-injection safety valve V13; the return-hammer pipeline includes a return-hammer control valve V1, a return-hammer valve V2, a return-hammer oil return valve V4, and a return-hammer check valve V18; one end of the manual hammer front valve V3, one end of the return-hammer valve V2, and one end of the shuttle valve V6 are all connected to the oil pump 3, one end of the return-hammer oil return valve V4, and one end of the pressure-injection safety valve V13 are all connected to the oil tank 2, the other end of the manual hammer front valve V3, and the other end of the return-hammer oil return valve V4 are all connected to one end of the high-pressure stop valve V11, and the other end of the high-pressure stop valve V11, The other end of the injection safety valve V13 is connected to the injection inlet, the other end of the shuttle valve V6 is connected to one end of the hammer front control valve V5 and one end of the return hammer control valve V1, one end of the return hammer check valve V18 is connected to the injection outlet, and the other end of the return hammer valve V2 is connected to the other end of the return hammer check valve V18; the hammer front control valve V5, the high-pressure stop control valve V12, the return hammer control valve V1, and the injection safety valve V13 are electrically connected to the control unit respectively, the hammer front control valve V5 controls the switch of the manual hammer front valve V3 and the return hammer oil return valve V4, the high-pressure stop control valve V12 controls the switch of the high-pressure stop valve V11, and the return hammer control valve V1 controls the switch of the return hammer valve V2. The inlet of the shuttle valve V6 is connected to the oil pump 3 and the fast accumulator A1 to ensure the stability of the pilot oil.

[0030] The accumulator control pipeline includes an accumulator valve V9, an accumulator control valve V10 and an accumulator oil discharge valve V8. The accumulator control valve V10 and the accumulator oil discharge valve V8 are electrically connected to the control unit respectively. The accumulator control valve V10 controls the switch of the accumulator valve V9. One end of the accumulator valve V9 is connected to the oil pump 3 and one end of the shuttle valve V6. One end of the accumulator oil discharge valve V8 is connected to the oil tank 2. The other end of the accumulator valve V9 and the other end of the accumulator oil discharge valve V8 are both connected to the fast accumulator A1. When the accumulator oil discharge valve V8 is opened, the oil of the fast accumulator A1 can enter the oil tank 2; when the accumulator oil discharge valve V8 is closed, the oil of the fast accumulator A1 can be prevented from entering the oil tank 2.

[0031] The outlet closed-loop control pipeline includes a quick-discharge proportional valve V17 and a pilot accumulator A2. The quick-discharge proportional valve V26 is electrically connected to the control unit. The two ends of the quick-discharge proportional valve V17 are respectively connected to the first injection outlet and the oil tank 2. The pilot accumulator A2 is connected to the outlet of the quick-discharge proportional valve V17.

[0032] The pilot accumulator A2 is connected to the quick-discharge proportional valve V17 and the oil tank 2 respectively, so as to provide pilot pressure oil to the quick-discharge proportional valve V17. In particular, the pilot accumulator A2 is also connected to a one-way valve V15, which is used to isolate the fast accumulator A1 and the pilot accumulator A2.

[0033] The inlet closed-loop control pipeline includes a fast proportional valve V26, which is electrically connected to the control unit, and the two ends of the fast proportional valve V26 are respectively connected to the fast accumulator and the injection inlet.

[0034] The differential pipeline includes a differential valve V27, and two ends of the differential valve V27 are respectively connected to the second injection outlet and the fast accumulator.

[0035] The boost control pipeline includes a pilot accumulator A3, a boost proportional valve V23, and a boost proportional safety valve V25. One end of the boost proportional valve V23 is connected to the fast accumulator A1, and the other end of the boost proportional valve V23 is connected to the boost inlet. One end of the pilot oil of the boost proportional valve V23 is connected to one end of the boost proportional safety valve V25, and the pilot accumulator A3 is connected to the other end of the boost proportional safety valve V25. The boost proportional valve V23 and the boost proportional safety valve V25 are electrically connected to the control unit respectively.

[0036] The pilot accumulator A3 is connected to the pressure-increasing proportional safety valve V25, so that pilot pressure oil can be provided to the pressure-increasing proportional safety valve V25.

[0037] In one embodiment of the present invention, the boost control pipeline further includes a boost safety valve V22, the boost safety valve V22 is electrically connected to the control unit, and both ends of the boost safety valve V22 are connected to the boost inlet and the fuel tank respectively.

[0038] The boost front chamber oil return pipeline includes a boost oil return valve V19 and a boost oil return control valve V20. The two ends of the boost oil return valve V19 are respectively connected to the boost outlet and the oil tank 2. The boost oil return control valve V20 is electrically connected to the control unit. One end of the boost oil return control valve V20 is connected to the other end of the shuttle valve V6. The boost oil return control valve V20 controls the switch of the boost oil return valve V19.

[0039] In one embodiment of the present invention, the oil delivery pipeline also includes a boost reset filling pipeline connecting the boost outlet and the fuel tank 2 and used for boost reset, and the boost reset filling pipeline includes a boost aftertaste filling valve V14 connecting the boost outlet and the fuel tank 2.

[0040] In one embodiment of the present invention, the oil delivery pipeline also includes a boost reset oil return pipeline connecting the boost inlet and the fuel tank 2 and used for boost reset, and the boost reset oil return pipeline includes a boost return oil valve V21 connecting the boost inlet and the fuel tank 2.

[0041] In addition, the oil pipeline also includes an air filter F1 for air filtration and an oil filter F2 for oil filtration. The air filter F1 is connected to the oil tank 2. One end of the oil filter F2 is connected to the fast accumulator A1. The other end of the oil filter F2 is connected to a one-way valve V28. The one-way valve V28 is used to isolate the fast accumulator A1 and the pilot accumulator A3.

[0042] The speed control of the present invention is a double closed-loop control of the inlet and outlet. This control method has more precise control over the speed and is arbitrarily adjustable within the range of 0.02m / s-10m / s. Moreover, the slow section accelerates evenly with little jitter, the fast section accelerates quickly (only 18ms from 0.5m / s to 9.8m / s) with little impact, and the braking effect is more obvious than that of a single closed-loop control. It has good process adjustability for the product and better protection for the mold.

[0043] The operation actually used in the present invention is as follows:

[0044] 1. Preparation stage: Before the injection action, the hammer return signal and the fast accumulator pressure signal are detected. When the pressure detection value of the pressure sensor R3 is lower than the set value, the energy storage action is performed: the oil pump 3 supplies oil, the energy storage control valve V10 and the energy storage oil discharge valve V8 are powered and work under the electronic control of the control unit, the energy storage valve V9 is opened under the control of the energy storage control valve V10, and the energy storage oil discharge valve V8 prevents the fast accumulator A1 from discharging oil, thereby allowing the fast accumulator A1 to store energy; when the pressure detection value of the pressure sensor R3 reaches the set value, stop storing energy and enter the next step.

[0045] 2. Slow hammer pre-action: This step has two operating modes, which can be switched through the control unit, namely manual hammer pre-action and automatic slow hammer pre-action. Among them, when the manual pre-hammer action is selected, the oil pump 3 supplies oil, the pre-hammer control valve V5, the accumulator oil discharge valve V8, the injection safety valve V13, and the quick-discharge proportional valve V17 are powered on and work under the electronic control of the control unit, the manual pre-hammer valve V3 is opened under the control of the pre-hammer control valve V5, and the high-pressure stop valve V11 is opened under the control of the high-pressure stop control valve V12, and the injection piston rod moves forward to perform the manual pre-hammer action; when the automatic slow pre-hammer action is selected, the fast accumulator A1 supplies oil, the accumulator oil discharge valve V8, the high-pressure stop control valve V12, the injection safety valve V13, the quick-discharge proportional valve V17, and the quick-discharge proportional valve V26 are powered on and work under the electronic control of the control unit, the high-pressure stop valve V11 is closed under the control of the high-pressure stop control valve V12, and the differential valve V27 does not work. At this time, the quick-discharge proportional valves V17 and V26 are controlled by the analog signals DF1 and DF3 given by the control unit, respectively. At this time, the opening is small, and a slow pre-hammer action is performed. This action is used for initial debugging and subsequent maintenance. The speed in this stage is in the range of 0.02m / s-0.5m / s.

[0046] 3. Differential hammer pre-action: The fast accumulator A1 supplies oil, the accumulator oil discharge valve V8, the high-pressure cut-off control valve V12, the injection safety valve V13, and the fast proportional valve V26 work under the analog signal DF3 given by the control unit. The opening size of V26 can be arbitrarily controlled by the analog signal DF3. The high-pressure cut-off valve V11 is closed under the control of the high-pressure cut-off control valve V12, and the differential valve V27 works. The forward speed of the injection piston rod is greater than the slow hammer pre-stage, and the differential hammer pre-action is performed. This control method is fast, the accumulator consumes less energy, the pressure drop is small, and the accumulator pressure is stable.

[0047] 4. Rapid pre-hammer action: The rapid accumulator A1 supplies oil, the accumulator oil discharge valve V8, the high-pressure cut-off control valve V12, the injection safety valve V13, the quick-discharge proportional valve V17, and the quick-discharge proportional valve V26 work under the analog signal DF3 given by the control unit, the high-pressure cut-off valve V11 is closed under the control of the high-pressure cut-off control valve V12, and the differential valve V27 does not work. At this time, the opening sizes of the quick-discharge proportional valve V17 and the quick-discharge proportional valve V26 are respectively controlled by the analog signals DF1 and DF3 given by the control unit, which can achieve dual closed-loop control of the inlet and outlet, with high speed control accuracy, fast speed-up, small impact, and small outlet back pressure, which can effectively reduce the braking time at the end of the rapid pre-hammer action. The speed value at this stage is in the range of 0.5m / s-10m / s.

[0048] 5. Boosting action: The fast accumulator A1 supplies oil, the accumulator oil discharge valve V8, the high-pressure cut-off control valve V12, the injection safety valve V13, the quick-discharge proportional valve V17, the boost oil return control valve V20, the boost safety valve V22, the boost proportional valve V23, and the boost proportional safety valve V25 are energized and work under the electronic control of the control unit, the high-pressure cut-off valve V11 is closed under the control of the high-pressure cut-off control valve V12, the fast proportional valve V26 is closed very quickly, the boost oil return control valve V19 is opened under the control of the boost oil return control valve V20, and the pressure oil of the fast accumulator enters the boost rodless chamber 11 after controlling the boost proportional valve V23 through the analog signal DF2 to perform the boosting action.

[0049] 6. Follow-out action: The fast accumulator A1 supplies oil, and the accumulator oil discharge valve V8, high-pressure cut-off control valve V12, injection safety valve V13, quick-discharge proportional valve V17, boost safety valve V22, and quick-discharge proportional valve V26 are electrically controlled by the control unit to work, and the high-pressure cut-off valve V11 is closed under the control of the high-pressure cut-off control valve V12, and the differential valve V27 does not work. The accumulator pressure oil controls the quick-discharge proportional valve V26 through the analog signal DF3 given by the control unit and then enters the injection rodless chamber 13. The outlet analog signal DF1 given by the control unit controls the quick-discharge proportional valve V17 to cooperate with the control hammer to follow out. This speed can be adjusted arbitrarily within the range.

[0050] 7. Back-hammer action: Oil pump 3 supplies oil, and the back-hammer control valve V1 and the accumulator oil discharge valve V8 are powered and work under the electronic control of the control unit, and the back-hammer valve V2 is opened under the control of the back-hammer control valve V1. The back-hammer one-way valve V18 is opened, and the system pressure oil enters the injection rod chamber 14 through the back-hammer valve V2, and the oil in the injection rodless chamber 13 returns to the oil tank through the high-pressure stop valve V11 and the back-hammer oil return valve V4; V14 is opened, and the boost rod chamber 12 sucks oil from the oil tank; the boost return oil return valve V21 is opened, and the oil in the boost rodless chamber 11 returns to the oil tank 2.

[0051] The characteristic of the patent of the present invention is that the inlet and outlet of the injection oil cylinder 1 are both closed-loop controlled, and the flow of the inlet and outlet is controlled at the same time, which is easier to control in use, and the effect is stable and controllable. In the slow section, uniform acceleration control can be achieved, and the piston movement jitter is small; in the fast section, because the rod chamber pressure control is relatively low, under the premise of relatively low pressure difference, the quick-displacement proportional valve V17 is easier to control, and the inlet and outlet are both closed-loop controlled, so the speed control is more accurate in the high-speed section, as shown in the following formula: Q=μQN (△p / △pN)^0.5. Among them, Q is the flow corresponding to the pressure difference △p, QN is the flow corresponding to the rated pressure difference △pN, and μ is the flow coefficient. It is easier to brake when the speed is about to end, and the braking effect is more obvious: the current industry machines have a rod cavity with high pressure, about 450bar. When the pressure is 450bar and the braking time is about 30ms at 4m / s, we can control the pressure to about 80bar. At this time, the time required to brake from a speed of 4m / s is only 15ms, and the braking response effect can be doubled. In terms of speed control, the accuracy can be adjusted arbitrarily in the range of 0.02m / s-10m / s, and the speed can be increased from 0.5m / s-9.8m / s in just 18ms, and the braking time can be controlled at 15ms.

[0052] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the claims of the present application.

[0053] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A speed double closed-loop control oil circuit, characterized in that: It includes an injection oil cylinder, an oil tank, an oil pump, a fast accumulator A1, an oil pipeline with a plurality of electric control valves and a control unit. The internal cavity of the injection oil cylinder includes a boost rodless cavity with a boost inlet, a boost rod cavity with a boost outlet, an injection rodless cavity with an injection inlet, and an injection rod cavity with a first injection outlet and a second injection outlet. The electric control valves in the oil pipeline are all electrically connected to the control unit. The oil delivery pipeline includes: an inlet closed-loop control pipeline connecting the fast accumulator A1 and the injection inlet, an outlet closed-loop control pipeline connecting the first injection outlet and the oil tank, a differential pipeline connecting the second injection outlet and the fast accumulator A1, a boost control pipeline connecting the boost inlet and the fast accumulator A1, a boost front chamber oil return pipeline connecting the boost outlet and the oil tank, an accumulator control pipeline connecting the oil pump and the fast accumulator A1, a hammer front control pipeline connecting the oil pump and the injection inlet, and a hammer return pipeline connecting the oil pump and the first injection outlet; dual closed-loop control of the inlet and outlet speeds of the injection oil cylinder is realized through the control unit, the outlet closed-loop control pipeline and the inlet closed-loop control pipeline; The front-hammer control pipeline includes a manual hammer front valve V3, a hammer front control valve V5, a shuttle valve V6, a high-pressure stop valve V11, a high-pressure stop control valve V12, and a pressure-injection safety valve V13; the return-hammer pipeline includes a return-hammer control valve V1, a return-hammer valve V2, a return-hammer oil return valve V4, and a return-hammer check valve V18; one end of the manual hammer front valve V3, one end of the return-hammer valve V2, and one end of the shuttle valve V6 are all connected to the oil pump, one end of the return-hammer oil return valve V4, and one end of the pressure-injection safety valve V13 are all connected to the oil tank, the other end of the manual hammer front valve V3 and the other end of the return-hammer oil return valve V4 are all connected to one end of the high-pressure stop valve V11, and the other end of the high-pressure stop valve V11 , and the other end of the injection safety valve V13 are connected to the injection inlet, the other end of the shuttle valve V6 is connected to one end of the hammer front control valve V5 and one end of the return hammer control valve V1, one end of the return hammer check valve V18 is connected to the first injection outlet, and the other end of the return hammer valve V2 is connected to the other end of the return hammer check valve V18; the hammer front control valve V5, the high-pressure stop control valve V12, the return hammer control valve V1, and the injection safety valve V13 are electrically connected to the control unit respectively, the hammer front control valve V5 controls the switch of the manual hammer front valve V3 and the return hammer oil return valve V4, the high-pressure stop control valve V12 controls the switch of the high-pressure stop valve V11, and the return hammer control valve V1 controls the switch of the return hammer valve V2; The accumulator control pipeline includes an accumulator valve V9, an accumulator control valve V10 and an accumulator oil discharge valve V8, the accumulator control valve V10 and the accumulator oil discharge valve V8 are electrically connected to the control unit respectively, the accumulator control valve V10 controls the switch of the accumulator valve V9, one end of the accumulator valve V9 is connected to the oil pump and one end of the shuttle valve V6, one end of the accumulator oil discharge valve V8 is connected to the oil tank, and the other end of the accumulator valve V9 and the other end of the accumulator oil discharge valve V8 are both connected to the fast accumulator A1; The outlet closed-loop control pipeline includes a quick-discharge proportional valve V17 and a pilot accumulator A2. The quick-discharge proportional valve V17 is electrically connected to the control unit. The two ends of the quick-discharge proportional valve V17 are respectively connected to the first injection outlet and the oil tank. The pilot accumulator A2 is connected to the pilot oil inlet of the quick-discharge proportional valve V17. The inlet closed-loop control pipeline includes a fast proportional valve V26 and a fast accumulator A1. The fast proportional valve V26 is electrically connected to the control unit. Both ends of the fast proportional valve V26 are respectively connected to the fast accumulator A1 and the injection inlet. The fast accumulator A1 is connected to the pilot oil inlet of the fast proportional valve V26. The differential pipeline includes a differential valve V27, and two ends of the differential valve V27 are respectively connected to the second injection outlet and the fast accumulator A1; The boost control pipeline includes a pilot accumulator A3, a boost proportional valve V23, and a boost proportional safety valve V25. One end of the boost proportional valve V23 is connected to the fast accumulator A1, and the other end of the boost proportional valve V23 is connected to the boost inlet. One end of the pilot oil of the boost proportional valve V23 is connected to one end of the boost proportional safety valve V25, and the pilot accumulator A3 is connected to the other end of the boost proportional safety valve V25. The boost proportional valve V23 and the boost proportional safety valve V25 are electrically connected to the control unit respectively. The boost control pipeline also includes a boost safety valve V22, which is electrically connected to the control unit, and the two ends of the boost safety valve V22 are connected to the boost inlet and the fuel tank respectively; The boost front chamber oil return pipeline includes a boost oil return valve V19 and a boost oil return control valve V20. The two ends of the boost oil return valve V19 are respectively connected to the boost outlet and the oil tank. The boost oil return control valve V20 is electrically connected to the control unit. One end of the boost oil return control valve V20 is connected to the other end of the shuttle valve V6. The boost oil return control valve V20 controls the switch of the boost oil return valve V19.

2. The speed dual closed-loop control oil circuit according to claim 1 is characterized in that: The first injection outlet is connected to a pressure sensor R1 and / or a pressure gauge B1; the injection inlet is connected to a pressure sensor R2 and / or a pressure gauge B2; the nitrogen charging port of the fast accumulator A1 is connected to a pressure sensor R3 and / or a pressure gauge B3; the pressure sensors R1, R2 and R3 are all electrically connected to the control unit.

3. The speed dual closed-loop control oil circuit according to claim 1 is characterized in that: The oil delivery pipeline also includes a boost reset filling pipeline connecting the boost outlet and the fuel tank, and the boost reset filling pipeline includes a boost return filling valve V14 connecting the boost outlet and the fuel tank.

4. The speed dual closed-loop control oil circuit according to claim 1 is characterized in that: The oil delivery pipeline also includes a boost reset oil return pipeline connecting the boost inlet and the oil tank, and the boost reset oil return pipeline includes a boost reset oil return valve V21 connecting the boost inlet and the oil tank.

5. The speed dual closed-loop control oil circuit according to claim 1 is characterized in that: An air filter is also included, and the air filter is in communication with the oil tank.

6. The speed dual closed-loop control oil circuit according to claim 1 is characterized in that: It also includes an oil filter, one end of which is connected to the fast accumulator A1, and the other end of which is connected to a one-way valve.

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