Pressurizing cylinder device and pressurizing method using pressurizing cylinder device

Abstract

The invention discloses a pressurizing cylinder device and a pressurizing method using the pressurizing cylinder device, the pressurizing cylinder device comprises a power electric cylinder assembly comprising a servo motor, a speed reducing mechanism and a high-pressure power cylinder, the high-pressure power cylinder is a piston oil cylinder, a piston and a piston rod are arranged in the high-pressure power cylinder, and the interior of a cylinder body is divided into a reset cavity and a pressurizing cavity by the piston; the pressurizing mechanism comprises a high-pressure power cylinder barrel, a pressurizing rod capable of axially stretching into the high-pressure power cylinder barrel, and a power driving source for driving the pressurizing rod to stretch out and draw back; the oil storage cylinder is connected with a reset cavity of the high-pressure power cylinder through a first oil pipe and connected with an oil supplementing opening of the high-pressure power cylinder barrel through a first oil way; the electric control system is configured to control the stroke motion of the servo motor and the pressurization action of the power driving source; and a high-pressure output oil way of the high-pressure power cylinder barrel is communicated to a pressurizing cavity of the high-pressure power cylinder. The device has the advantages of being controllable in stroke, stable in output pressure and free of oil injection.

Description

Technical Field

[0001] The present invention relates to the technical field of supercharging, and in particular to a supercharging cylinder device and a supercharging method using the supercharging cylinder device. Background Art

[0002] The booster cylinder is a pressure element that can convert input pressure into output pressure at a higher pressure. It can be driven by hydraulic oil, compressed gas, or a combination of gas and liquid. The piston rod of the booster cylinder outputs power mainly driven by hydraulic oil or compressed gas to reciprocate. It provides a certain pressure when it is extended outward and retracts when not in use. When boosting, the piston and the piston rod on the piston are kept pushed outward by continuously inputting high-pressure hydraulic oil or compressed air into the piston chamber to support the piston during the boosting process, thereby achieving the purpose of increasing the pressure.

[0003] The traditional booster cylinder is driven by a combination of hydraulic and pneumatic pressure. The hydraulic cylinder pushes the piston rod out, and then drives the hydraulic oil into the piston chamber through the booster cylinder or booster hydraulic cylinder to achieve the purpose of boosting. When the piston rod is reset using this traditional boosting technology, its stroke and working return oil are in a high-pressure and high-speed state, and an oil-gas mixture will be generated in the return oil tank of the hydraulic cylinder. This oil-gas mixture is easy to spray out and contaminate the processed products, such as food-grade products such as lunch boxes. Usually, only oil tank inlet and outlet valves can be set on the return oil tank for isolation, which cannot achieve a complete isolation effect, and oil and gas may spray out from the return oil tank. In addition, the hydraulic drive piston rod has inaccurate positioning, unstable pressure, and difficult to control stroke.

[0004] The existing booster cylinder is also driven by an electric cylinder alone when working. The servo motor is used to drive its output shaft to push the piston rod outward. In order to ensure the pressure output by the piston rod to the outside, a high-power electric cylinder is often required. The high-power servo motor is large in size and high in cost, which leads to high cost of the electric cylinder. The servo motor drives its output shaft to consume a lot of energy in the corresponding output stroke, which wastes power.

[0005] The above-mentioned prior art booster cylinder has the problems of oil and gas spraying during use and high cost, high energy consumption and large size when driven by an electric cylinder alone, which have become technical problems that need to be solved urgently. Summary of the invention

[0006] The purpose of the present invention is to provide a booster cylinder device and a booster method using the booster cylinder device, in which the piston rod of the high-pressure power cylinder is driven by a servo motor to perform an unloaded stroke movement. After the piston rod is in place, the booster mechanism drives the booster rod to extend into the high-pressure power cylinder barrel to squeeze the hydraulic oil, and the pressure is transmitted to the booster chamber of the high-pressure power cylinder, thereby achieving a booster effect on the piston rod; during the return stroke, the piston rod is retracted by the servo motor. During the entire process, the stroke is controllable, the positioning is precise, and the output pressure is stable to ensure that no oil and gas spraying will occur.

[0007] To achieve the above object, the present invention provides a technical solution: a booster cylinder device, comprising: The power cylinder assembly includes a servo motor, a reduction mechanism connected to the servo motor, and a high-pressure power cylinder driven by the reduction mechanism. The high-pressure power cylinder is a piston oil cylinder, which is provided with a piston and a piston rod. The piston divides the interior of the cylinder into a reset chamber and a boost chamber. The boost mechanism comprises a high-pressure power cylinder, a boost rod axially extendable into the high-pressure power cylinder, and a power driving source for driving the boost rod to extend and retract, wherein the power driving source is a servo motor or a cylinder; The oil storage cylinder is connected to the reset chamber of the high-pressure power cylinder through the first oil pipe and is connected to the oil replenishing port of the high-pressure power cylinder barrel through the first oil circuit; an electronic control system configured to control the stroke motion of the servo motor and the boost action of the power drive source; The high-pressure output oil circuit of the high-pressure power cylinder is connected to the booster chamber at the rear side of the high-pressure power cylinder.

[0008] The present invention adopts the above-mentioned technical scheme, and the servo motor drives the reduction mechanism to move, and the reduction mechanism drives the piston rod of the high-pressure power cylinder to extend and abut the workpiece, and the boosting mechanism drives the boosting rod through the power driving source to extend into the high-pressure power cylinder barrel, so that the hydraulic oil in the high-pressure power cylinder barrel is squeezed, and the high-pressure power cylinder barrel is connected to the boosting chamber of the high-pressure power cylinder through the high-pressure output oil circuit, and the pressure is transmitted to the piston, so that the piston and the piston rod are subjected to the superimposed pressure, thereby achieving a boosting effect. During the boosting process, the oil in the reset chamber of the high-pressure power cylinder flows back to the oil storage cylinder through the first oil pipe; when resetting, the boosting driving source drives the boosting rod to retract from the high-pressure power cylinder barrel, unloading the high-pressure power The servo motor reverses and drives the piston rod of the high-pressure power cylinder to retract and leave the workpiece through the reduction mechanism. During the return stroke, the oil in the boost chamber flows back to the high-pressure power cylinder through the high-pressure output oil circuit, and the oil in the oil storage cylinder flows into the reset chamber of the high-pressure power cylinder through the first oil pipe. The servo motor drives the piston rod to extend during the no-load stroke stage and drives the piston rod to retract during the return stroke. The stroke is stable, the positioning is precise, the output pressure is stable, and there is no oil and gas spraying when the oil returns. The boost drive source is used for boosting, which reduces the power of the servo motor, thereby reducing the power and volume of the power cylinder assembly and reducing the cost.

[0009] In the above-mentioned booster cylinder device, the booster mechanism is configured as at least one group, which is used to drive the booster rod to axially extend into the high-pressure power cylinder barrel. When the number of booster mechanisms is superimposed, the power of the servo motor can be reduced accordingly.

[0010] The booster cylinder device mentioned above includes a servo motor and a reduction mechanism connected to the servo motor, and a high-pressure power cylinder driven by the reduction mechanism.

[0011] The above-mentioned booster cylinder device has a high-pressure power cylinder front cover at the front end and a high-pressure power cylinder rear cover at the rear end, the high-pressure power cylinder rear cover is connected to the high-pressure power cylinder, the power driving source is provided with a booster front cover, the booster front cover is arranged on the side wall of the high-pressure power cylinder rear cover, the booster front cover and the high-pressure power cylinder rear cover are provided with a high-pressure output oil circuit, and the high-pressure power cylinder barrel is connected to the booster chamber through the high-pressure output oil circuit.

[0012] In the above-mentioned booster cylinder device, the oil storage cylinder is provided with an oil storage cylinder front cover, the oil storage cylinder front cover is arranged on the side wall of the booster front cover, and the oil storage cylinder front cover and the booster front cover are connected to the high-pressure power cylinder barrel through the first oil passage.

[0013] In the above-mentioned booster cylinder device, a flange is provided on the outer side of the front cover of the high-pressure power cylinder. The flange is used to install and fix the booster cylinder device.

[0014] In the above-mentioned booster cylinder device, when the power driving source is a servo electric cylinder, its output end is connected to the booster rod through a ball screw; when it is a pneumatic cylinder, the air pressure input is controlled by a proportional valve. Among them, the proportional valve controls the air pressure input into the cylinder barrel when the power driving source is a pneumatic cylinder, which is used to drive the movement of the booster rod. The control of the proportional valve can control the rate of the boosting action of the booster rod and improve the accuracy of the boosting.

[0015] In the above-mentioned booster cylinder device, an external vent valve is provided on the top of the oil storage cylinder and the interior is kept at normal pressure. The external vent valve is used to properly discharge the air pressure in the oil storage cylinder, so that the interior of the oil storage cylinder is kept at normal pressure to prevent oil and gas from spraying out.

[0016] The above-mentioned booster cylinder device has an electronic control system with a stroke control module, which determines the switching point of the action stage by jointly determining the position sensor set at the end of the piston rod and the pressure sensor in the boost chamber. The position sensor can be used to detect the movement position of the piston rod and determine whether the piston rod has moved to the limit position of the no-load stroke, thereby starting the boost mechanism to increase pressure through the stroke control module of the electronic control system. The position sensor can also be used to detect the reset movement of the piston rod in place, thereby stopping the reset action of the driving servo motor; the pressure sensor can be used to detect the pressure value applied by the boost mechanism to the piston rod.

[0017] The above-mentioned booster cylinder device is configured with the following actions through the electronic control system: a) During the no-load stroke stage, only the power cylinder assembly is started to drive the piston rod to move; b) When the piston rod reaches the preset pressurizing position, all the booster mechanisms are started synchronously so that their output pressure is superimposed on the holding force vector of the power cylinder assembly.

[0018] During the no-load stroke stage, a small-power servo motor that can drive the movement in the no-load stroke stage is used to achieve the technical effects of stable stroke and precise positioning. During the pressurization operation, the booster mechanism is started synchronously to superimpose its output pressure with the holding force vector of the power electric cylinder assembly, thereby achieving boosting by the booster drive source and reducing the power of the servo motor. As a result, the servo motor of the power electric cylinder assembly has lower power, smaller size, and lower cost.

[0019] The present invention also provides a method for boosting pressure using the boosting cylinder device described in any one of the above technical solutions, comprising the following steps: No-load stroke stage: the servo motor drives the piston rod of the high-pressure power cylinder to extend, and the oil in the reset chamber flows back to the oil storage cylinder through the first oil pipe; Pressurization stage: When the workpiece is in contact, the electronic control system starts the booster mechanism, and the power driving source pushes the booster rod to compress the oil in the high-pressure cylinder barrel. The high-pressure oil enters the booster through the output oil circuit to form a superimposed pressure; Return stage: the servo motor reverses, the oil storage cylinder replenishes oil to the high-pressure cylinder barrel through the second oil pipe, and at the same time the reset chamber sucks the oil from the oil storage cylinder to complete the reset.

[0020] The above-mentioned boosting method and electronic control system are configured to perform the following actions: a) First drive the power cylinder assembly to complete the axial stroke of the piston rod or reset action; b) Start the booster mechanism to pressurize or relieve the high-pressure cylinder.

[0021] The above-mentioned boosting method and electronic control system are configured to perform the following actions: a1) First drive the power cylinder assembly to complete the axial stroke of the piston rod; b1) Start the booster mechanism to pressurize the high-pressure oil cylinder; b2) Drive the booster mechanism to release the pressure on the high-pressure cylinder; a2) Drive the power cylinder assembly to complete the axial stroke reset of the piston rod.

[0022] The above-mentioned boosting method and electronic control system are configured to perform the following actions: a) During the no-load stroke stage, only the power cylinder assembly is started to drive the piston rod to move; b) When the piston rod reaches the preset pressurizing position, all the booster mechanisms are started synchronously so that their output pressure is superimposed on the holding force vector of the power cylinder assembly.

[0023] The beneficial effects achieved by the present invention are as follows: after the servo motor pushes the piston to move to the specified position, the booster drive cylinder is activated, driving the piston to compress the hydraulic oil and replenish it into the booster chamber of the high-pressure power cylinder, supporting the piston and its piston rod, and playing a pressurizing role. When the piston rod extends to provide pressure, the output end of the servo motor supports the piston through the mechanical structure and will not be compressed, thereby maintaining good pressure output and having the advantage of stable output pressure. Using a servo motor as the main propulsion power has the characteristics of accurate positioning compared to traditional hydraulic propulsion.

[0024] The servo motor is used to drive the piston rod to extend, and there will be no problem of oil and gas mixing and leakage during the return stroke. It can be suitable for the production of food-grade products. The servo motor has precise positioning and is combined with a booster mechanism for boosting. It can achieve the boosting effect while reducing the power of the servo motor, and has the advantages of energy saving and small size.

[0025] The servo motor, high-pressure power cylinder, high-pressure power cylinder barrel and oil storage cylinder form a closed oil circuit. The precise driving of the servo motor and the precise speed control during resetting ensure that the piston rod of the high-pressure power cylinder will not be in a high-speed and high-pressure state during the stroke of extending to provide pressure and retracting to reset, thereby preventing oil and vapor leakage through physical isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the booster cylinder device according to the first embodiment of the present invention; Figure 2 is a schematic cross-sectional structural diagram of a booster cylinder device according to a first embodiment of the present invention; Figure 3 is a schematic diagram of the three-dimensional structure of a booster cylinder device according to a second embodiment of the present invention; Figure 4 is a schematic cross-sectional structural diagram of a booster cylinder device according to a second embodiment of the present invention; Figure 5 2 is a schematic structural diagram of a pre-pressurized state of a booster cylinder device according to a first embodiment of the present invention; Figure 6 1 is a schematic structural diagram of a boosting cylinder device in a boosting state according to a first embodiment of the present invention; Figure 7 1 is a schematic structural diagram of a pressure relief state of a booster cylinder device according to a first embodiment of the present invention; Figure 8 It is a structural schematic diagram of the return state of the boosting cylinder device of the first embodiment of the present invention; Fig. 9 is a schematic structural diagram of a pre-pressurized state of a booster cylinder device according to a second embodiment of the present invention; Fig.10 is a schematic structural diagram of a boosting cylinder device in a boosting state according to a second embodiment of the present invention; Fig.11is a structural schematic diagram of a pressure relief state of a booster cylinder device according to a second embodiment of the present invention; Fig.12 2 is a schematic structural diagram of a return stroke state of a booster cylinder device according to a second embodiment of the present invention; Fig.13 It is a schematic diagram of a control system for controlling the actions of a servo motor and a booster mechanism by the electronic control system of the present invention.

[0027] Explanation of the reference numerals in the accompanying drawings: power electric cylinder assembly 1, servo motor 101, reduction mechanism 102, high-pressure power cylinder 103, piston 104, piston rod 105, reset chamber 106, boost chamber 107, flange 108, boost mechanism 2, high-pressure power cylinder barrel 201, boost rod 202, power drive source 203, high-pressure output oil circuit 204, boost front cover 205, proportional valve 206, solenoid valve 207, air source processor 208, air source 209, oil storage cylinder 301, first oil pipe 302, first oil circuit 303, oil storage cylinder front cover 304, external ventilation valve 305, electronic control system 401, position sensor 402, pressure sensor 403. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Reference Figures 1 to 4 As shown, a booster cylinder device is characterized by comprising: The power cylinder assembly 1 comprises a servo motor 101, a speed reduction mechanism 102 connected to the servo motor 101, and a high-pressure power cylinder 103 driven by the speed reduction mechanism 102. The high-pressure power cylinder 103 is a piston oil cylinder, which is provided with a piston 104 and a piston rod 105. The piston divides the interior of the cylinder into a reset chamber 106 and a boost chamber 107. The boost mechanism 2 comprises a high-pressure power cylinder 201, a boost rod 202 axially extendable into the high-pressure power cylinder 201, and a power driving source 203 for driving the boost rod to extend and retract. The power driving source 203 is a servo motor or a cylinder. The oil storage cylinder 301 is connected to the reset chamber 106 of the high-pressure power cylinder through the first oil pipe 302 and is connected to the oil replenishing port of the high-pressure power cylinder barrel 201 through the first oil passage 303; The electric control system 401 is configured to control the stroke movement of the servo motor 101 and the boosting action of the power driving source 203; The high-pressure output oil passage 204 of the high-pressure power cylinder 201 is connected to the booster chamber 107 at the rear side of the high-pressure power cylinder.

[0030] The servo motor 101 is used to drive the telescopic movement of the piston rod 105 of the high-pressure power cylinder 103, which has the characteristics of stable output pressure, precise control of speed, pressure and stroke. The booster mechanism 2 is configured as at least one group, which is used to drive the booster rod 202 to axially extend into the high-pressure power cylinder barrel 201.

[0031] The boost mechanism 2 is configured as at least one group, which is used to drive the boost rod 202 to axially extend into the high-pressure power cylinder 201. Among them, each additional group of power drive source 203 and high-pressure power cylinder 201 can reduce the power of the servo motor 101 accordingly, thereby reducing the power, volume and cost of the power electric cylinder assembly 1. In specific use, multiple groups of power drive sources 203 and high-pressure power cylinder 201 can also be used in combination with cylinders and hydraulic cylinders driven by hydraulic oil in parallel to form an oil-gas composite drive. In this embodiment, the boost mechanism 2 can be an electric cylinder composed of an electric cylinder combined with a differential gear box and a screw nut structure.

[0032] The front end of the high-pressure power cylinder 103 is provided with a high-pressure power cylinder front cover 104, and the rear end is provided with a high-pressure power cylinder rear cover 105. The high-pressure power cylinder rear cover 105 is connected to the high-pressure power cylinder 103. The power driving source 203 is provided with a booster front cover 205. The booster front cover 205 is arranged on the side wall of the high-pressure power cylinder rear cover 105. The booster front cover 205 and the high-pressure power cylinder rear cover 105 are provided with a high-pressure output oil circuit 204. The high-pressure power cylinder barrel 201 is connected to the booster chamber 107 through the high-pressure output oil circuit 204.

[0033] The oil storage cylinder 301 is provided with an oil storage cylinder front cover 304 , and the oil storage cylinder front cover 304 is arranged on the side wall of the supercharging front cover 205 . The oil storage cylinder front cover 304 and the supercharging front cover 205 are connected to the high-pressure power cylinder barrel 201 through the first oil passage 303 .

[0034] A flange 108 is disposed on the outer side of the high-pressure power cylinder front cover 104 .

[0035] When the power driving source 203 is a servo electric cylinder, its output end is connected to the booster rod 202 through a ball screw; when it is a pneumatic cylinder, the pneumatic input is controlled by a proportional valve 206. Figure 1 As described above, when the power driving source 203 is a cylinder, the gas source 209 is used to provide high-pressure gas to drive the cylinder to move, and the airflow delivered to the power driving source 203 can be pressurized by a booster pump to achieve high-pressure airflow. An air source processor 208 and a solenoid valve 207 are provided on the pipeline connecting the air source 209 to the cylinder. The air source processor 208 is used to process the airflow to keep it dry, and the solenoid valve 207 is used to turn on and off and switch the high-pressure airflow, and control the power driving source 203 to drive the booster rod 204 to extend or retract. The proportional valve 206 can be a pressure reducing valve, which is used to control the air pressure input.

[0036] An external ventilation valve 306 is provided on the top of the oil storage cylinder 301 and the interior is kept at normal pressure.

[0037] The electric control system 401 is provided with a stroke control module, which jointly determines the action phase switching point through a position sensor 402 arranged at the end of the piston rod 105 and a pressure sensor 403 in the boost chamber 107 .

[0038] The high-pressure power cylinder barrel 201 is connected to the boost chamber 107 of the high-pressure power cylinder 103. The servo motor 101 is connected to the piston 104 through the reduction mechanism 102, and drives the piston rod 105 to move axially to the position and reset. The reduction mechanism 102 can drive the axial linear motion of the screw through the structure of the screw nut pair, and connect the piston 104 and the piston rod 105 through the screw, thereby driving the extension and retraction of the piston rod 105. When the piston rod 105 extends out of the high-pressure power cylinder 103, a certain pressure is provided to the outside. When not in use, the power cylinder assembly 1 pulls back the piston rod 105; the power driving source 203 extends into the high-pressure power cylinder barrel 201 through its booster rod 202, so that the hydraulic oil of the high-pressure power cylinder barrel 201 enters the booster chamber 107 to apply pressure to the piston 104 and realize the boosting of the piston rod 105. The oil storage cylinder 301 is connected with the reset chamber 106 of the high-pressure power cylinder 103 through the first oil pipe 302, so that when the piston rod 105 is extended outward, the hydraulic oil flows back from the reset chamber 106 to the oil storage cylinder 301. When the piston rod 105 moves inward and returns, the hydraulic oil in the booster chamber 107 of the high-pressure power cylinder 103 flows back to the high-pressure power cylinder barrel 201, and part of the hydraulic oil in the oil storage cylinder 301 is sucked into the reset chamber 106, thereby realizing the circulation of the hydraulic oil.

[0039] The power driving source 203 adopts a servo motor or a cylinder, wherein the servo motor is connected to a reduction mechanism and a screw nut pair to form an electric cylinder, and the booster rod 202 of the electric cylinder is axially extended into the high-pressure power cylinder barrel 201 to squeeze the hydraulic oil, so that the pressure is transmitted to the booster chamber 107 of the high-pressure power cylinder 103 to achieve the purpose of boosting.

[0040] like Fig.13 As shown, it is a schematic diagram of a control system in which the electronic control system controls the action of the servo motor and the booster mechanism; the electronic control system 401 is connected to the servo motor 101 and the power driving source 203 respectively, and the electronic control system 401 drives the servo motor 101 to work to realize the no-load stroke of the piston rod 105, and the electronic control system 401 drives the cylinder power driving source 203 to work, and drives the booster rod 202 to extend into the high-pressure power cylinder barrel 201 to realize the pressurization stroke.

[0041] This embodiment also discloses a method for boosting pressure using the boosting cylinder device described in the above specific embodiment, comprising the following steps: No-load stroke stage: the servo motor 101 drives the piston rod 105 of the high-pressure power cylinder 103 to extend, and the oil in the reset chamber 106 flows back to the oil storage cylinder 301 through the first oil pipe 302; Pressurization stage: When contacting the workpiece, the electronic control system 401 starts the booster mechanism 2, and the power driving source 203 pushes the booster rod 202 to compress the oil in the high-pressure oil cylinder 201, and the high-pressure oil enters the booster chamber 107 through the output oil path 204 to form a superimposed pressure; Return stage: the servo motor 101 reverses, the oil storage cylinder 301 replenishes oil to the high-pressure oil cylinder barrel 201 through the second oil pipe 303, and at the same time the reset chamber 106 sucks the oil from the oil storage cylinder to complete the reset.

[0042] Specifically, the electric control system 401 is configured to perform the following actions: a) First, drive the power cylinder assembly to complete the axial stroke of the piston rod 105 to the desired position or reset action; b) Start the booster mechanism to pressurize or relieve the high-pressure cylinder 201.

[0043] The electronic control system 401 is configured to perform the following actions: a1) Firstly, the power cylinder assembly is driven to complete the axial stroke of the piston rod 105; b1) starting the booster mechanism to pressurize the high-pressure oil cylinder 201; b2) driving the booster mechanism to release the pressure from the high-pressure oil cylinder 201; a2) Drive the power cylinder assembly to complete the axial stroke reset of the piston rod 105.

[0044] The electronic control system 401 is configured to perform the following actions: a) In the no-load stroke stage, only the power cylinder assembly is started to drive the piston rod 105 to move; b) When the piston rod reaches the preset pressurizing position, all the booster mechanisms are started synchronously so that their output pressure is superimposed on the holding force vector of the power cylinder assembly; The maximum output force F1 of the power cylinder assembly and the total output force F2 of the booster mechanism group satisfy: F2 ≥ 3F1.

[0045] During the specific implementation of the present invention, the working process of its oil circuit system mainly includes an unloaded stroke stage, a pressurization stage and a return stage. The unloaded stroke stage is a process in which the power electric cylinder assembly 1 drives the piston rod 105 to extend out of the high-pressure power cylinder 103. During this process, the piston rod 105 moves from not contacting the load to contacting the workpiece; the pressurization stage is a process in which the piston rod 105 contacts the workpiece and outputs pressure to the outside, the power drive source 203 is actuated, and the piston rod 105 is pressurized through the high-pressure power cylinder barrel 201; the pressure relief stage is a process in which the power drive source 203 is reset and its pressure on the high-pressure power cylinder 4 is relieved; the return stage is a process in which the power drive source 203 is relieved of pressure, and at the same time, the power electric cylinder assembly 1 drives the piston rod 105 to retract into the high-pressure power cylinder 103.

[0046] In the no-load stroke stage, the servo motor 101 drives the piston rod 105 of the high-pressure power cylinder 103 to extend, and the hydraulic oil in the reset chamber 106 flows back to the oil storage cylinder 301 through the first oil pipe 302. The hydraulic oil in the oil storage cylinder 301 replenishes the high-pressure power cylinder barrel 201 through the first oil passage 303.

[0047] During the pressurization stage, when the piston rod 105 contacts the workpiece, the electronic control system 7 controls the power drive source 203 to move, pushing the booster rod 202 to compress the hydraulic oil in the high-pressure power cylinder 201, and the high-pressure hydraulic oil enters the booster chamber 107 through the high-pressure output oil circuit 204 to form a superimposed pressure, thereby achieving pressurization of the piston rod 105.

[0048] During the pressure relief stage, the power driving source 203 controls its booster rod 202 to retract, thereby releasing the pressure on the high-pressure power cylinder 201 .

[0049] During the return stage, the servo motor 101 reverses, driving the piston 104 and the piston rod 105 to return to their original positions through the power cylinder assembly 1. The hydraulic oil in the boost chamber 107 flows back to the high-pressure power cylinder 201 through the high-pressure output oil circuit 204, and at the same time, the hydraulic oil in the oil storage cylinder 301 replenishes the reset chamber 106.

[0050] The workflow of the present invention during specific implementation is combined with the attached instructions. Figure 5 To Attachment Fig.12 Further description is as follows.

[0051] During the preloading process, Figure 5 or Fig. 9 As shown, the power cylinder assembly 1 pushes the piston 104 and the piston rod 105 to move outward to a predetermined position. At this time, the hydraulic oil in the reset chamber 106 of the high-pressure power cylinder 103 flows back to the oil storage cylinder 301 through the first oil pipe 302, and the booster chamber 107 of the high-pressure power cylinder 103 sucks the hydraulic oil in the high-pressure oil cylinder barrel 201.

[0052] During the pressurization process, Figure 6 or Fig.10 As shown, when the piston rod 105 extends to a predetermined position, the power driving source 203 is activated, and its booster rod 202 moves toward the high-pressure power cylinder barrel 201 and extends into the high-pressure power cylinder barrel 201, so that the hydraulic oil in the high-pressure power cylinder barrel 201 is squeezed, and the pressure is transmitted to the booster chamber 107 of the high-pressure power cylinder 103 through the high-pressure output oil circuit 204, so that the hydraulic oil in the booster chamber 107 applies a certain pressure to the piston 104 and the piston rod 105, achieving a boosting effect. During the pre-pressurization and boosting process, the hydraulic oil in the reset chamber 106 of the high-pressure power cylinder 103 flows back to the oil storage cylinder 301 through the first oil pipe 302.

[0053] During the decompression process, Figure 7 or Fig.11As shown, the power driving source 203 is activated, and its booster rod 202 moves away from the high-pressure power cylinder 201 to release the pressure on the high-pressure power cylinder 201, and then the power cylinder assembly 1 pulls the piston 104 and the piston rod 105 back.

[0054] During the return journey, if Figure 8 or Fig.12 As shown, the power drive source 203 is completely reset, the power cylinder assembly 1 continues to pull the piston 104 and the piston rod 105 to move back, and the piston 104 squeezes the hydraulic oil in the booster chamber 107 back into the high-pressure power cylinder barrel 201 and the oil storage cylinder 301. At the same time, the hydraulic oil in the oil storage cylinder 301 also flows into the reset chamber 106 of the high-pressure power cylinder 103 through the first oil pipe 302, thus completing an action cycle; at this time, the piston rod 105 is reset to the initial position.

[0055] The present invention has been tested by pressure. When the input pressure is 20MPa, when the power source 203 is a booster electric cylinder driven by a servo motor, the output pressure of the piston rod 105 after superposition reaches 82MPa, and the system response time is ≤0.3s; it is driven by hydraulic oil and high-pressure gas, that is, the high-pressure gas drives the booster rod 202 in the power source 203 to compress the hydraulic oil combination of the high-pressure power cylinder 201. After superposition, the output pressure of the piston rod 105 reaches 75MPa, and the unit stroke energy consumption is reduced by 62% compared with pure electric cylinder drive. The oil-gas isolation test shows that the oil aerosol content in the oil storage cylinder 301 is less than 0.005ppm after 1000 cycles.

[0056] The present invention creatively constructs a basic power + supercharging cluster system to achieve power decoupling, vector superposition and dynamic compensation.

[0057] Power decoupling: Only low-power motors (≤2KW) are required to drive the stroke stage, and multiple groups of low-power power drive sources 203 (single rent ≤5KW) work together in the high-pressure stage. Vector superposition: Through N groups of power drive sources 203 combined with high-pressure power cylinders 201 in parallel, the total output pressure F2 and the output pressure F1 of the servo motor 1 meet F2≥3F1. Dynamic compensation: Each parallel power drive source 203 and high-pressure power cylinder 201 combination adopts independent closed-loop control to compensate for pressure fluctuations in real time.

[0058] In some embodiments, the power driving source 203 is a booster electric cylinder driven by three groups of servo motors, each group is equipped with a 3.5KW servo motor. When it is detected that the piston rod 105 reaches the pressurized position, the servo motor 101 (2KW) of the servo motor 1 switches to the position holding mode, and the power consumption is reduced to 0.8KW; the three groups of electric cylinders composed of servo motors combined with differential gear boxes and screw nut structures are started synchronously, with a total power of 10.5KW; the differential gear box couples the three groups of outputs to the booster drive rod 26, and the output force reaches 4.2 times that of the servo motor 101.

[0059] The energy consumption comparison data of the present invention and the traditional solution in this embodiment are as follows: | Working conditions | Traditional solution | This invention | | No-load phase energy consumption | 15KW | 0.75KW | | Energy consumption during pressurization phase | 15KW | 12KW | | Overall power saving rate | - | 58% | In the 50-ton stamping test, the traditional electric cylinder requires a 15KW servo motor to work throughout the entire process, and the measured energy consumption is 204.3kwh / thousand times; this embodiment has 0.75KW in the no-load stage + 10.5KW in the pressurized stage, and the measured high level is 9.8kwh / thousand times; the pressure adjustment is reduced from ±8% to ±1.2%.

[0060] The present invention improves the traditional mode of pure electric cylinder drive or hydraulic or pneumatic drive. The present invention adopts staged action control, and minimizes the volume change of oil in the oil storage cylinder (controlled within 5%) by completing the full-stroke reset of the servo motor first, thereby greatly reducing oil disturbance; the normal pressure oil storage design ensures that the oil storage cylinder always maintains a normal pressure state, and its external vent valve only ventilates a small amount under a very small pressure difference, and cooperates with submicron filtration to achieve zero oil molecule penetration; the oil circuit pressure is isolated, and the first oil circuit in the pressurization stage is completely physically isolated from the oil storage cylinder to avoid reverse diffusion of high-pressure oil and vapor.

[0061] In actual tests, the oil replacement cycle of the oil storage cylinder 301 of the embodiment of the present invention is extended from 80 hours to 2000 hours.

[0062] In summary, the present invention has been made into actual samples and tested for multiple times as described in the specification and the drawings. From the results of the test, it can be proved that the present invention can achieve its intended purpose, and its practical value is beyond doubt. The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention in any form. Any person with ordinary knowledge in the technical field, if it does not depart from the scope of the technical features of the present invention, uses the equivalent embodiments of the technical content disclosed by the present invention to make partial changes or modifications, and does not depart from the technical features of the present invention, all still fall within the scope of the technical features of the present invention.

Claims

1. A booster cylinder device, characterized in that: include: A power cylinder assembly (1) comprises a servo motor (101), a speed reduction mechanism (102) drivingly connected to the servo motor, and a high-pressure power cylinder (103) driven by the speed reduction mechanism, wherein the high-pressure power cylinder (103) is a piston oil cylinder having a piston (104) and a piston rod (105) disposed therein, wherein the piston divides the interior of the cylinder into a reset chamber (106) and a pressure-increasing chamber (107); The boosting mechanism (2) comprises a high-pressure power cylinder (201), a boosting rod (202) that can axially extend into the high-pressure power cylinder (201), and a power driving source (203) that drives the boosting rod to extend and retract, wherein the power driving source (203) is a servo motor or a cylinder; The oil storage cylinder (301) is connected to the reset chamber (106) of the high-pressure power cylinder through a first oil pipe (302), and is connected to the oil replenishing port of the high-pressure power cylinder barrel (201) through a first oil passage (303); An electric control system (401) configured to control the travel motion of the servo motor (101) and the boosting action of the power driving source (203); The high-pressure output oil passage (204) of the high-pressure power cylinder barrel (201) is connected to the pressure-boosting chamber (107) at the rear side of the high-pressure power cylinder.

2. The booster cylinder device according to claim 1, characterized in that: The boosting mechanism (2) is configured as at least one group, and is used to drive the boosting rod (202) to axially extend into the high-pressure power cylinder (201).

3. The booster cylinder device according to claim 1, characterized in that: The front end of the high-pressure power cylinder (103) is provided with a high-pressure power cylinder front cover (104), and the rear end is provided with a high-pressure power cylinder rear cover (105); the high-pressure power cylinder rear cover (105) is connected to the high-pressure power cylinder (103); the power driving source (203) is provided with a booster front cover (205); the booster front cover (205) is arranged on the side wall of the high-pressure power cylinder rear cover (105); the booster front cover (205) and the high-pressure power cylinder rear cover (105) are provided with a high-pressure output oil circuit (204); the high-pressure power cylinder barrel (201) is connected to the booster chamber (33) via the high-pressure output oil circuit (204).

4. The booster cylinder device according to claim 1, characterized in that: The oil storage cylinder (301) is provided with an oil storage cylinder front cover (304), and the oil storage cylinder front cover (304) is arranged on the side wall of the booster front cover (205). The oil storage cylinder front cover (304) and the booster front cover (205) are connected to the high-pressure power cylinder barrel (201) via a first oil passage (303).

5. The booster cylinder device according to claim 1, characterized in that: When the power driving source (203) is a servo electric cylinder, its output end is connected to the booster rod (202) via a ball screw; when it is an air cylinder, the air pressure input is controlled via a proportional valve (206).

6. The booster cylinder device according to claim 1, characterized in that: An external ventilation valve (306) is provided on the top of the oil storage cylinder (301) and the interior is kept at normal pressure.

7. The booster cylinder device according to claim 1, characterized in that: The electric control system (401) is provided with a stroke control module, which jointly determines the action phase switching point through a position sensor (402) arranged at the end of the piston rod (105) and a pressure sensor (403) in the boost chamber (107).

8. The method for boosting pressure by using a boosting cylinder device according to claim 1, characterized in that: The following actions are configured by the electronic control system (401): a) During the no-load stroke stage, only the power cylinder assembly is activated to drive the piston rod (105) to move; b) When the piston rod reaches the preset pressurizing position, all the booster mechanisms are started synchronously so that their output pressure is superimposed on the holding force vector of the power cylinder assembly.

9. A method for boosting pressure using the boosting cylinder device according to any one of claims 1 to 8, characterized in that: The steps include: No-load stroke stage: the servo motor (101) drives the piston rod (105) of the high-pressure power cylinder (103) to extend, and the oil in the reset chamber (106) flows back to the oil storage cylinder (301) through the first oil pipe (302); Pressurization stage: when contacting the workpiece, the electronic control system (401) starts the booster mechanism (2), the power driving source (203) pushes the booster rod (202) to compress the oil in the high-pressure oil cylinder (201), and the high-pressure oil enters the booster chamber (107) through the output oil path (204) to form a superimposed pressure; In the return stroke phase, the servo motor (101) rotates in the reverse direction, the oil storage cylinder (301) replenishes oil to the high-pressure oil cylinder barrel (201) through the second oil pipe (303), and at the same time, the reset chamber (106) sucks the oil from the oil storage cylinder to complete the reset.

10. The method for boosting pressure by using a boosting cylinder device according to claim 9, characterized in that: The electronic control system (401) is configured with the following actions: a) First, drive the power cylinder assembly to complete the axial stroke of the piston rod (105) to the desired position or reset action; b) Start the booster mechanism to pressurize or release the high-pressure cylinder (201).

11. The method for boosting pressure by using a boosting cylinder device according to claim 10, characterized in that: The electronic control system (401) is configured with the following actions: a1) First drive the power cylinder assembly to complete the axial stroke of the piston rod (105) to the desired position; b1) starting the pressure boosting mechanism to pressurize the high-pressure oil cylinder (201); b2) driving the booster mechanism to release the pressure from the high-pressure oil cylinder (201); a2) Drive the power cylinder assembly to complete the axial stroke reset of the piston rod (105).

12. The method for boosting pressure by using a boosting cylinder device according to claim 9, characterized in that: The electronic control system (401) is configured with the following actions: a) During the no-load stroke stage, only the power cylinder assembly is activated to drive the piston rod (105) to move; b) When the piston rod reaches the preset pressurizing position, all the booster mechanisms are started synchronously so that their output pressure is superimposed on the holding force vector of the power cylinder assembly.

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