An energy-saving CNC hydraulic cushion system

Abstract

The present invention relates to the field of hydraulic control technology, and specifically discloses an energy-saving CNC hydraulic pad system, including a hydraulic cylinder, a first oil supply circuit, a second oil supply circuit, a first oil return circuit, and a first valve assembly, a second valve assembly, and a third valve assembly. The first interface of the first valve assembly is connected to the first oil supply circuit through a pipeline, and the second interface of the first valve assembly is connected to the first interface of the second valve assembly through a pipeline; the second interface of the second valve assembly is connected to the rodless cavity through a pipeline; the rod cavity is connected to the first oil supply circuit through a pipeline; the first interface of the third valve assembly is connected to the second oil supply circuit through a pipeline, and the second interface of the third valve assembly is connected to the rod cavity through a pipeline. When the hydraulic cylinder pressurizes the mold, the hydraulic oil in the rod cavity of the present invention is discharged and merged with the hydraulic oil transported by the rodless cavity to flow to the rodless cavity, thereby accelerating the extension speed of the piston, realizing the rapid pressurization of the mold by the hydraulic cylinder, and reducing the energy consumption of the system.

Description

[0001] The invention relates to the technical field of hydraulic control, and in particular to an energy-saving numerically controlled hydraulic cushion system. Background Art

[0002] The CNC hydraulic cushion system is a key equipment on large presses. The system includes a complete hydraulic control system, which is mainly composed of hydraulic pumps, hydraulic cylinders, control valves, pipelines and induction monitoring devices.

[0003] The actuators of the hydraulic pad mainly include an upper crown and a hydraulic cylinder. The upper crown is in contact with the ejector rod, and the workpiece is clamped through the ejector rod. The hydraulic cylinder is arranged on the lower plane of the crown, providing the main power source for the hydraulic pad, which can control the running speed of the crown and ensure its rapid positioning within the travel range.

[0004] The existing hydraulic pad only has a high-pressure servo valve in the rodless chamber. The rodless chamber needs to have higher energy to push the upper crown to process the workpiece and achieve basic processing requirements. However, in modern industry, "energy saving" is a very important consideration. The design of the existing hydraulic pad needs to consider how to reduce energy consumption while meeting processing requirements.

[0005] Based on the above problems, how to achieve rapid pressurization of the mold by the hydraulic rod while consuming less energy is an issue that needs to be solved urgently. Summary of the invention

[0006] In view of the technical problems in the prior art, the present invention provides an energy-saving CNC hydraulic cushion system.

[0007] An energy-saving CNC hydraulic cushion system of the present invention comprises a hydraulic cylinder, a first oil supply circuit, a second oil supply circuit, a control oil circuit, a first oil return circuit, a second oil return circuit, a first valve assembly, a second valve assembly and a third valve assembly, wherein:

[0008] The interior of the hydraulic cylinder is divided into a rodless chamber and a rod chamber;

[0009] The first interface of the first valve assembly is connected to the first oil supply circuit through a pipeline, the second interface of the first valve assembly is connected to the first interface of the second valve assembly through a pipeline, and the third interface of the first valve assembly is connected to the first oil return circuit through a pipeline; when the hydraulic cylinder rises, the first interface and the second interface of the first valve assembly are connected, and when the hydraulic cylinder descends, the second interface and the third interface of the first valve assembly are connected;

[0010] The second interface of the second valve assembly is communicated with the rodless chamber through a pipeline;

[0011] The rod chamber is communicated with the first interface of the first valve assembly and the first oil supply path respectively through pipelines;

[0012] The first interface of the third valve assembly is communicated with the second oil supply circuit through a pipeline, the second interface of the third valve assembly is communicated with the rod chamber through a pipeline, and the third interface of the third valve assembly is communicated with the first oil return circuit through a pipeline;

[0013] The control oil circuit is in communication with the first oil circuit control interface of the first valve assembly, the second valve assembly and the third valve assembly;

[0014] The second oil return circuit is in communication with the first valve assembly, the second valve assembly and the second oil circuit control interface of the third valve assembly.

[0015] Furthermore, the CNC hydraulic pad system also includes a fourth valve assembly, a first interface of the fourth valve assembly is connected to the rodless chamber through a pipeline, and a second interface of the fourth valve assembly is connected to the first oil return circuit through a pipeline.

[0016] Furthermore, the fourth valve assembly includes a first two-way valve, a first solenoid valve, a second solenoid valve, a first overflow valve, and a second overflow valve; wherein:

[0017] The first interface and the second interface of the first two-way valve are the first interface and the second interface of the fourth valve component;

[0018] The control chamber of the first two-way valve is connected to the first interface of the first solenoid valve, the first interface of the second solenoid valve and the first relief valve through a pipeline; the second interface of the second solenoid valve is connected to the second relief valve; the set pressure of the first relief valve is greater than the set pressure of the second relief valve;

[0019] The second oil return path is communicated with the oil return interfaces of the first two-way valve, the first solenoid valve, the second solenoid valve, the first overflow valve, and the second overflow valve.

[0020] Furthermore, the CNC hydraulic cushion system further includes a pressure detection assembly disposed on a pipeline connecting the rodless chamber and the first two-way valve, the pressure detection assembly including a first pressure sensor, a second pressure sensor and a third solenoid valve; wherein:

[0021] The first interface of the third solenoid valve is communicated with the rodless chamber, and the first pressure sensor is arranged on the second interface of the third solenoid valve;

[0022] The second pressure sensor is arranged on a pipeline connecting the rodless chamber and the first two-way valve;

[0023] The pressure measurement upper limit of the first pressure sensor is smaller than the pressure measurement upper limit of the second pressure sensor.

[0024] Furthermore, the CNC hydraulic cushion system also includes a third overflow valve, and a first interface and a second interface of the third overflow valve are respectively connected to the rodless chamber and the first oil return circuit through pipelines.

[0025] Furthermore, the control oil circuit includes a main oil pipe and a first oil pipe, a second oil pipe, and a third oil pipe as branches of the main oil pipe; wherein:

[0026] The first oil pipe is in communication with the first oil circuit control interface of the first valve assembly; the second oil pipe is in communication with the first oil circuit control interface of the second valve assembly; the third oil pipe is in communication with the first oil circuit control interface of the third valve assembly;

[0027] The second oil pipe is provided with a first one-way valve, and the flow direction of the first one-way valve is from the main oil pipe to the second valve assembly.

[0028] Furthermore, the second oil pipe is also connected to the rodless chamber through a pipeline provided with a second one-way valve, and the flow direction of the second one-way valve is from the rodless chamber to the second oil pipe.

[0029] Furthermore, the second oil pipe is also connected to the first oil supply path through a pipeline provided with a third one-way valve, and the flow direction of the third one-way valve is from the first oil supply path to the second oil pipe.

[0030] Further, the second valve assembly includes a second two-way valve, a third two-way valve, a fourth solenoid valve and a fifth solenoid valve, wherein:

[0031] The first interface of the second two-way valve is the first interface of the second valve assembly, the second interface of the second two-way valve is connected to the first interface of the third two-way valve, and the second interface of the third two-way valve is the second interface of the second valve assembly;

[0032] The control chamber of the second two-way valve is connected to the control oil circuit through the fourth solenoid valve; the control chamber of the third two-way valve is connected to the control oil circuit through the fifth solenoid valve;

[0033] The control oil circuit is in communication with the first oil circuit control interfaces of the fourth solenoid valve and the fifth solenoid valve;

[0034] The second oil return circuit is communicated with the second oil circuit control interfaces of the fourth solenoid valve and the fifth solenoid valve.

[0035] Furthermore, a fourth one-way valve is provided on the first oil supply line, and the flow direction of the fourth one-way valve is from the first oil supply line to the first valve assembly.

[0036] In the energy-saving CNC hydraulic pad system of the present invention, the first interface of the first valve component is connected to the first oil supply circuit through a pipeline, the second interface of the first valve component is connected to the first interface of the second valve component through a pipeline, and the third interface of the first valve component is connected to the first oil return circuit through a pipeline; the second interface of the second valve component is connected to the rodless cavity through a pipeline; the rod cavity is connected to the first oil supply circuit and the first interface of the first valve component through a pipeline; the first interface of the third valve component is connected to the second oil supply circuit through a pipeline, the second interface of the third valve component is connected to the rod cavity through a pipeline, and the third interface of the third valve assembly is connected to the first oil return circuit through a pipeline; the control oil circuit is connected to the first oil circuit control interface of the first valve component, the second valve component and the third valve component; the second oil return circuit is connected to the second oil circuit control interface of the first valve component, the second valve component and the third valve component.

[0037] The present invention controls the pressure in the rod chamber and the rodless chamber through the first valve assembly, the second valve assembly and the third valve assembly. Compared with the method of arranging only a high-pressure three-way valve in the rodless chamber in the prior art, it is more energy-efficient. This is because according to the calculation method that energy consumption is equal to the product of pressure and flow, when the flow is constant, reducing the pressure can reduce the system energy consumption. When the hydraulic cylinder pressurizes the mold, the hydraulic oil in the rod chamber is discharged and merged with the hydraulic oil delivered to the rodless chamber, and together they flow to the rodless chamber, thereby accelerating the extension speed of the piston and realizing the rapid pressurization of the mold by the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A module composition diagram of an energy-saving CNC hydraulic pad system according to an embodiment of the present invention;

[0040] Figure 2 Another module composition diagram of an energy-saving CNC hydraulic cushion system according to an embodiment of the present invention;

[0041] Figure 3 A structural diagram of an energy-saving CNC hydraulic cushion system according to an embodiment of the present invention;

[0042] Among them, 10-hydraulic cylinder, 101-rodless chamber, 102-rod chamber, 103-mold, 104-piston, 105-displacement sensor, 20-first valve assembly, 30-second valve assembly, 301-second two-way valve, 302-third two-way valve, 303-fourth solenoid valve, 304-fifth solenoid valve, 40-third valve assembly, 50-fourth valve assembly, 501-first two-way valve, 502-first solenoid valve, 503-second solenoid valve, 504-first overflow valve, 505-second overflow valve, 60-pressure detection assembly, 601-first pressure sensor, 602-second pressure sensor, 603-third solenoid valve, 70-third overflow valve, 80-first check valve, 90-second check valve, 100-third check valve, 110-fourth check valve. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the protection scope of the present invention.

[0045] An energy-saving CNC hydraulic cushion system according to an embodiment of the present invention, such as Figure 1 As shown, the CNC hydraulic cushion system includes a hydraulic cylinder 10, a first oil supply circuit P1, a second oil supply circuit P2, a control oil circuit X, a first oil return circuit T, a second oil return circuit Y, and a first valve assembly 20, a second valve assembly 30 and a third valve assembly 40, wherein:

[0046] The interior of the hydraulic cylinder 10 is divided into a rodless chamber 101 and a rod chamber 102; Figure 1 As shown, the top of the hydraulic cylinder 10 is a mold 103 to be processed. The CNC hydraulic pad system of the embodiment of the present invention is to realize the upward and downward movement of the piston 104 in the hydraulic cylinder 10. When the piston 104 moves upward, hydraulic oil enters the rodless chamber 101 and then flows out from the rod chamber 102. When the piston 104 moves downward, hydraulic oil enters the rod chamber 102 and then flows out from the rodless chamber 101.

[0047] In order to more accurately grasp the rising and falling distances of the piston 104 in this embodiment, a displacement sensor 105 may be disposed inside the hydraulic cylinder 10 .

[0048] like Figure 1 As shown, in the embodiment of the present invention, the interfaces for connecting the rodless cavity 101 and the rod cavity 102 with the external pipeline are represented by A and B respectively.

[0049] In this embodiment, the first interface of the first valve assembly 20 is connected to the first oil supply circuit P1 through a pipeline, the second interface of the first valve assembly 20 is connected to the first interface of the second valve assembly 30 through a pipeline, and the third interface of the first valve assembly 20 is connected to the first oil return circuit T through a pipeline; when the hydraulic cylinder 10 rises, the first interface and the second interface of the first valve assembly 20 are connected, and the hydraulic oil flows from the first interface of the first valve assembly 20 to the second interface; when the hydraulic cylinder 10 descends, the second interface and the third interface of the first valve assembly 20 are connected, and the hydraulic oil flows from the second interface of the first valve assembly 20 to the third interface.

[0050] The second interface of the second valve assembly 30 is connected to the rodless chamber 101 through a pipeline, that is, it is connected to the A interface; the rod chamber 102 is connected to the first oil supply circuit P1 through a pipeline, that is, the B interface is connected to the first oil supply circuit P1, and the rod chamber 102 is also connected to the first interface of the first valve assembly 20 through a pipeline.

[0051] The first interface of the third valve assembly 40 is connected to the second oil supply circuit P2 through a pipeline, the second interface of the third valve assembly 40 is connected to the rod chamber 102 through a pipeline, and the third interface of the third valve assembly 40 is connected to the first oil return circuit T through a pipeline; Figure 1 As shown, the second interface of the third valve assembly 40 is connected to the B interface through a pipeline.

[0052] In an embodiment of the present invention, the power-off safety position of the third valve assembly 40 can be set to a state in which its second interface is connected to the third interface. When the third valve assembly 40 is energized, its first interface and the second interface are connected, and the hydraulic oil in the second oil supply circuit P2 enters from the first interface of the third valve assembly 40, flows out from the second interface, and flows to the B interface of the rod chamber 102. When the third valve assembly 40 loses power, its second interface and the third interface are connected, and the hydraulic oil in the rod chamber 102 enters from the second interface of the third valve assembly 40, flows out from the third interface, and flows to the first return oil circuit T. In this way, the rod chamber 102 can be unloaded, thereby playing a safety role.

[0053] The control oil circuit X is communicated with the first oil circuit control interfaces of the first valve assembly 20, the second valve assembly 30 and the third valve assembly 40, and the second oil return circuit Y is communicated with the second oil circuit control interfaces of the first valve assembly 20, the second valve assembly 30 and the third valve assembly 40. The control oil circuit X and the second oil return circuit Y are set to control the working states of the first valve assembly 20, the second valve assembly 30 and the third valve assembly 40 through the oil circuit. The oil is input from the control oil circuit X to the first oil circuit control interface, and output from the second oil circuit control interface to flow back to the second oil return circuit Y.

[0054] like Figure 1As shown, in the embodiment of the present invention, the interfaces of each valve component are represented by 1, 2, and 3 to represent the first interface, the second interface, and the third interface. Figure 1 , the working principle of the embodiment of the present invention is as follows:

[0055] When the hydraulic cylinder 10 rises: the first oil supply circuit P1 supplies oil, and the hydraulic oil therein flows into the first interface 1 of the first valve assembly 20. At this time, the first interface 1 and the second interface 2 of the first valve assembly 20 are connected, and the hydraulic oil flows into the first interface 1 of the second valve assembly 30, and flows out from the second interface 2 of the second valve assembly 30, and flows into the rodless chamber 101 through the A interface; the hydraulic oil is discharged from the B interface of the rod chamber 102, and the third valve assembly 40 is closed. The oil discharged from the B interface returns to the first interface 1 of the first valve assembly 20 through the pipeline again, forming a differential circuit, that is, the hydraulic oil in the rod chamber 102 is discharged and merged with the hydraulic oil transported to the rodless chamber 101 by the first oil supply circuit P1, and flows to the rodless chamber 101 together, which can accelerate the extension speed of the piston 104 and realize the rapid pressurization of the mold by the hydraulic cylinder.

[0056] When the hydraulic cylinder 10 descends: the piston 104 of the hydraulic cylinder 10 is subjected to the downward pressure (external force) F, or due to the deadweight of the piston 104, the piston 104 will move downward, at this time, the second oil supply circuit P2 supplies oil, and the hydraulic oil enters the first interface 1 of the third valve assembly 40. At this time, the first interface 1 and the second interface 2 of the third valve assembly 40 are connected, and the hydraulic oil flows to the B interface of the rod chamber 102 through the first interface 1 and the second interface 2 of the third valve assembly 40. The piston 104 is subjected to the external force and the pressure of the rod chamber 102, and has a tendency to move downward; the hydraulic oil is discharged from the A interface of the rodless chamber 101, enters the second interface 2 of the second valve assembly 30, and then flows out through the first interface 1 of the second valve assembly 30. In this mode, the second interface 2 and the third interface 3 of the first valve assembly 20 are connected, so the hydraulic oil flows to the first return oil circuit T through the second interface 2 and the third interface 3 of the first valve assembly 20.

[0057] In this process, the pressure of the hydraulic oil in the rodless chamber 101 can be controlled to be maintained within the target pressure by controlling the opening sizes of the second interface 2 and the third interface 3 in the first valve assembly 20 .

[0058] like Figure 1 As shown, the first oil supply circuit P1 and the second oil supply circuit P2 in the embodiment of the present invention can actually both supply oil to the rod chamber 102, so it is preferred that the second oil supply circuit P2 is used as a high-pressure oil supply, so that when the hydraulic cylinder 10 needs to descend, the oil can be quickly passed through the second oil supply circuit P2 first, allowing the piston 104 to quickly descend, and then the second oil supply circuit P2 is closed, and the oil is supplied by the first oil supply circuit P1 instead, thereby slowing down the descending speed of the piston 104.

[0059] The selection of the specific oil circuit and the timing of replacement are determined by those skilled in the art according to the implementation situation, and are not limited in the embodiments of the present invention.

[0060] Specifically, Figure 2 As shown, the CNC hydraulic pad system of the embodiment of the present invention also includes a fourth valve assembly 50, a first interface of the fourth valve assembly 50 is connected to the A interface of the rodless chamber 101 through a pipeline, and a second interface of the fourth valve assembly 50 is connected to the first return oil circuit T through a pipeline.

[0061] The fourth valve assembly 50 of the embodiment of the present invention is used to control the closing and discharge of oil in the rodless chamber 101 , where closing is the pressure-building state and discharge is the unloading state.

[0062] Specifically, Figure 3 As shown, the fourth valve assembly 50 of the embodiment of the present invention includes a first two-way valve 501, a first solenoid valve 502, a second solenoid valve 503, a first relief valve 504, and a second relief valve 505; wherein: the first interface and the second interface of the first two-way valve 501 are the first interface and the second interface of the fourth valve assembly 50, that is, the first interface of the first two-way valve 501 is connected to the A interface of the rodless chamber 101 through a pipeline, and the second interface of the first two-way valve 501 is connected to the first oil return circuit T through a pipeline; the control chamber of the first two-way valve 501 is connected to the first solenoid valve 502 through a pipeline. The first interface of valve 502, the first interface of the second solenoid valve 503 and the first overflow valve 504 are connected; the second interface of the second solenoid valve 503 is connected to the second overflow valve 505; the set pressure of the first overflow valve 504 is greater than the set pressure of the second overflow valve 505, that is, relatively speaking, in this embodiment, the first overflow valve 504 is a high-pressure overflow valve and the second overflow valve is a low-pressure overflow valve; the second oil return circuit Y is connected to the return oil interfaces of the first two-way valve 501, the first solenoid valve 502, the second solenoid valve 503 and the first overflow valve 504 and the second overflow valve 505.

[0063] In this embodiment, the first two-way valve 501 can be a two-way cartridge valve. When the first solenoid valve 502 is not energized, the rodless chamber 101 is unloaded, and the oil flows into the first interface of the first two-way valve 501 and is discharged to the return oil circuit T through the second interface; when the first solenoid valve 502 is energized and the second solenoid valve 503 is energized, at this time, if the pressure of the rodless chamber 101 exceeds the pressure set by the low-pressure relief valve, the first two-way valve 501 opens to unload, so that the pressure of the rodless chamber 101 is not higher than the set pressure of the low-pressure relief valve; when the first solenoid valve 502 is energized and the second solenoid valve 503 is not energized, at this time, if the pressure of the rodless chamber 101 exceeds the pressure set by the high-pressure relief valve, the first two-way valve 501 opens to unload, so that the pressure of the rodless chamber 101 is not higher than the set pressure of the high-pressure relief valve, thereby realizing multi-stage pressure protection and keeping the pressure of the rodless chamber 101 within a controllable range.

[0064] Specifically, Figure 3 As shown, the CNC hydraulic pad system of the embodiment of the present invention also includes a pressure detection component 60 arranged on the pipeline connecting the rodless chamber 101 and the first two-way valve 501, and the pressure detection component 60 includes a first pressure sensor 601, a second pressure sensor 602 and a third solenoid valve 603; wherein: the first interface of the third solenoid valve 603 is connected to the rodless chamber 101, and the first pressure sensor 601 is arranged on the second interface of the third solenoid valve 603; the second pressure sensor 602 is arranged on the pipeline connecting the rodless chamber 101 and the first two-way valve 501; the pressure measurement upper limit of the first pressure sensor 601 is less than the measurement upper limit of the second pressure sensor 602.

[0065] In this embodiment, two pressure sensors with different ranges are arranged on the oil circuit of the rodless chamber 101, which helps to improve the control accuracy. In addition, when the pressure in the rodless chamber 101 is low, the low-pressure pressure sensor (i.e., the first pressure sensor 601) is used to measure the pressure. At this time, the third solenoid valve 603 is connected, and the oil can flow from the rodless chamber 101 into the third solenoid valve 603; when the pressure in the rodless chamber 101 is high, the high-pressure pressure sensor (i.e., the second pressure sensor 602) is used. At this time, the third solenoid valve 603 is disconnected. The third solenoid valve 603 is used to close the oil circuit when the pressure is high to prevent the high-pressure oil from impacting the low-pressure pressure sensor and causing damage to the low-pressure pressure sensor.

[0066] Specifically, Figure 2 As shown, the numerical control hydraulic cushion system further includes a third overflow valve 70, and a first interface and a second interface of the third overflow valve 70 are respectively connected to the rodless chamber 101 and the first oil return circuit T through pipelines.

[0067] The third relief valve 70 in this embodiment can select a straight-through relief valve. When the pressure in the rodless chamber 101 is too high, the oil can flow to the first oil return circuit T through the third relief valve 70 to achieve pressure relief and protect the safe and stable operation of the entire system.

[0068] Specifically, Figure 2 and Figure 3 As shown, the control oil circuit X includes a main oil pipe and a first oil pipe, a second oil pipe, and a third oil pipe as branches of the main oil pipe; wherein: the first oil pipe is connected to the first oil circuit control interface of the first valve component 20; the second oil pipe is connected to the first oil circuit control interface of the second valve component 30; the third oil pipe is connected to the first oil circuit control interface of the third valve component 40; a first one-way valve 80 is provided on the second oil pipe, and the flow direction of the first one-way valve 80 is from the main oil pipe to the second valve component 30, and the first one-way valve 80 can ensure that the oil in the main oil pipe flows unidirectionally to the second valve component 30, so as to control the working state of the second valve component 30.

[0069] Preferably, the second oil pipe is also connected to the rodless chamber 101 through a pipeline provided with a second one-way valve 90, and the flow direction of the second one-way valve 90 is from the rodless chamber 101 to the second oil pipe.

[0070] If the control oil circuit X fails and the working state of the second valve assembly 30 cannot be controlled, the control oil can be obtained through the rodless chamber 101 , and the oil flows from the A interface through the second one-way valve 90 to the second valve assembly 30 .

[0071] More preferably, the second oil pipe is also connected to the first oil supply circuit P1 through a pipeline provided with a third one-way valve 100, the flow direction of the third one-way valve 100 is from the first oil supply circuit P1 to the second oil pipe, and the first oil supply circuit P1 is connected to the first oil circuit control interface of the second valve assembly 30 through the third one-way valve 100.

[0072] Similarly, if the control oil circuit X fails and the working state of the second valve assembly 30 cannot be controlled, oil can be supplied through the first oil supply circuit P1. The oil in the first oil supply circuit P1 flows through the third one-way valve 100 and then flows to the second valve assembly 30, thereby realizing on-off control of the second valve assembly 30.

[0073] Specifically, Figure 3 As shown, the second valve assembly 30 of the embodiment of the present invention includes a second two-way valve 301, a third two-way valve 302, a fourth solenoid valve 303 and a fifth solenoid valve 304, wherein: the first interface of the second two-way valve 301 is the first interface of the second valve assembly 30, that is, the first interface of the second two-way valve 301 is connected to the second interface of the first valve assembly 20; the second interface of the second two-way valve 301 is connected to the first interface of the third two-way valve 302, and the second interface of the third two-way valve 302 is the second interface of the second valve assembly 30, that is, the second interface of the third two-way valve 302 is connected to the A interface of the rodless chamber 101; the control chamber of the second two-way valve 301 is connected to the control oil circuit X through the fourth solenoid valve 303; the control chamber of the third two-way valve 302 is connected to the control oil circuit X through the fifth solenoid valve 304; the control oil circuit X is connected to the first oil circuit control interfaces of the fourth solenoid valve 303 and the fifth solenoid valve 304; the second oil return circuit Y is connected to the second oil circuit control interfaces of the fourth solenoid valve 303 and the fifth solenoid valve 304.

[0074] The second two-way valve 301 and the third two-way valve 302 in the embodiment of the present invention control their switch states by controlling the oil circuit X. Therefore, when an unexpected situation occurs during the operation of the system oil circuit and emergency stop is required, the control oil circuit X can realize the cut-off function of the second valve assembly 30, cut off the pipeline between the rodless chamber 101 and the first valve assembly 20, and lock the hydraulic cylinder 10 in the current position.

[0075] In addition, the present invention can achieve the above functions with one two-way valve and one solenoid valve. When two two-way valves, the second two-way valve 301 and the third two-way valve 302, and two solenoid valves, the fourth solenoid valve 303 and the fifth solenoid valve 304, are used, the margin can be increased and the operation effect of the system can be further improved.

[0076] Specifically, Figure 3 As shown, in the embodiment of the present invention, a fourth one-way valve 110 is disposed on the first oil supply path P1 , and the flow direction of the fourth one-way valve 110 is from the first oil supply path P1 to the first valve assembly.

[0077] The fourth check valve 110 is disposed at the outlet end of the first oil supply line P1 to prevent the oil in the pipeline connected thereto from flowing back to the first oil supply line P1 when the oil pressure is high, so as to ensure the stable operation of the system.

[0078] The first valve assembly 20 and the third valve assembly 40 of the embodiment of the present invention can adopt three-way servo valves that can realize the functions of the embodiment of the present invention. The present invention does not limit the specific product model. In addition, the cartridge valves of the embodiment of the present invention can be implemented by two-way cartridge valves. The present invention does not limit the specific product model, and technical personnel in this field can choose them at their own discretion.

[0079] In addition, the first oil supply circuit P1, the second oil supply circuit P2 and the control oil circuit X in the embodiment of the present invention are all pipelines for outputting hydraulic oil to the outside, so they are all connected to the accumulator to achieve the required oil pressure in the pipeline.

[0080] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in the field after reading this specification are all within the scope of protection of the present invention.

Claims

1. An energy-saving CNC hydraulic cushion system, characterized in that: The numerical control hydraulic cushion system comprises a hydraulic cylinder, a first oil supply circuit, a second oil supply circuit, a control oil circuit, a first oil return circuit, a second oil return circuit, and a first valve assembly, a second valve assembly and a third valve assembly, wherein: The interior of the hydraulic cylinder is divided into a rodless chamber and a rod chamber; The first interface of the first valve assembly is connected to the first oil supply circuit through a pipeline, the second interface of the first valve assembly is connected to the first interface of the second valve assembly through a pipeline, and the third interface of the first valve assembly is connected to the first oil return circuit through a pipeline; when the hydraulic cylinder rises, the first interface and the second interface of the first valve assembly are connected, and when the hydraulic cylinder descends, the second interface and the third interface of the first valve assembly are connected; The second interface of the second valve assembly is communicated with the rodless chamber through a pipeline; The rod chamber is communicated with the first interface of the first valve assembly and the first oil supply path respectively through pipelines; The first interface of the third valve assembly is communicated with the second oil supply circuit through a pipeline, the second interface of the third valve assembly is communicated with the rod chamber through a pipeline, and the third interface of the third valve assembly is communicated with the first oil return circuit through a pipeline; The control oil circuit is in communication with the first oil circuit control interface of the first valve assembly, the second valve assembly and the third valve assembly; The second oil return circuit is in communication with the first valve assembly, the second valve assembly and the second oil circuit control interface of the third valve assembly.

2. An energy-saving CNC hydraulic cushion system as claimed in claim 1, characterized in that: The CNC hydraulic cushion system further comprises a fourth valve assembly, a first interface of the fourth valve assembly is connected to the rodless chamber via a pipeline, and a second interface of the fourth valve assembly is connected to the first oil return circuit via a pipeline.

3. An energy-saving CNC hydraulic cushion system as claimed in claim 2, characterized in that: The fourth valve assembly includes a first two-way valve, a first solenoid valve, a second solenoid valve, a first overflow valve, and a second overflow valve; wherein: The first interface and the second interface of the first two-way valve are the first interface and the second interface of the fourth valve component; The control chamber of the first two-way valve is connected to the first interface of the first solenoid valve, the first interface of the second solenoid valve and the first relief valve through a pipeline; the second interface of the second solenoid valve is connected to the second relief valve; the set pressure of the first relief valve is greater than the set pressure of the second relief valve; The second oil return path is communicated with the oil return interfaces of the first two-way valve, the first solenoid valve, the second solenoid valve, the first overflow valve, and the second overflow valve.

4. An energy-saving CNC hydraulic cushion system as claimed in claim 3, characterized in that: The numerical control hydraulic cushion system further includes a pressure detection assembly disposed on a pipeline connecting the rodless chamber and the first two-way valve, the pressure detection assembly including a first pressure sensor, a second pressure sensor and a third solenoid valve; wherein: The first interface of the third solenoid valve is communicated with the rodless chamber, and the first pressure sensor is arranged on the second interface of the third solenoid valve; The second pressure sensor is arranged on a pipeline connecting the rodless chamber and the first two-way valve; The pressure measurement upper limit of the first pressure sensor is smaller than the pressure measurement upper limit of the second pressure sensor.

5. The energy-saving CNC hydraulic cushion system according to claim 1, characterized in that: The numerically controlled hydraulic cushion system further comprises a third overflow valve, a first interface and a second interface of the third overflow valve being respectively connected to the rodless chamber and the first oil return path through pipelines.

6. An energy-saving CNC hydraulic cushion system as claimed in claim 1, characterized in that: The control oil circuit includes a main oil pipe and a first oil pipe, a second oil pipe, and a third oil pipe as branches of the main oil pipe; wherein: The first oil pipe is in communication with the first oil circuit control interface of the first valve assembly; the second oil pipe is in communication with the first oil circuit control interface of the second valve assembly; the third oil pipe is in communication with the first oil circuit control interface of the third valve assembly; The second oil pipe is provided with a first one-way valve, and the flow direction of the first one-way valve is from the main oil pipe to the second valve assembly.

7. An energy-saving CNC hydraulic cushion system as claimed in claim 6, characterized in that: The second oil pipe is also connected to the rodless chamber via a pipeline provided with a second one-way valve, and the flow direction of the second one-way valve is from the rodless chamber to the second oil pipe.

8. An energy-saving CNC hydraulic cushion system as claimed in claim 7, characterized in that: The second oil pipe is also connected to the first oil supply circuit through a pipeline provided with a third one-way valve. The flow direction of the third one-way valve is from the first oil supply circuit to the second oil pipe. The first oil supply circuit is connected to the first oil circuit control interface of the second valve assembly through the third one-way valve.

9. The energy-saving CNC hydraulic cushion system according to claim 1, characterized in that: The second valve assembly includes a second two-way valve, a third two-way valve, a fourth solenoid valve and a fifth solenoid valve, wherein: The first interface of the second two-way valve is the first interface of the second valve assembly, the second interface of the second two-way valve is communicated with the first interface of the third two-way valve, and the second interface of the third two-way valve is the second interface of the second valve assembly; The control chamber of the second two-way valve is connected to the control oil circuit through the fourth solenoid valve; the control chamber of the third two-way valve is connected to the control oil circuit through the fifth solenoid valve; The control oil circuit is in communication with the first oil circuit control interfaces of the fourth solenoid valve and the fifth solenoid valve; The second oil return circuit is communicated with the second oil circuit control interfaces of the fourth solenoid valve and the fifth solenoid valve.

10. An energy-saving CNC hydraulic cushion system as claimed in claim 1, characterized in that: A fourth one-way valve is provided on the first oil supply line, and the flow direction of the fourth one-way valve is from the first oil supply line to the first valve assembly.

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