A lifting control device and control method for a CNC hydraulic press

Abstract

This invention discloses a lifting control device and method for a CNC hydraulic press. The lifting control device includes a support frame, a base plate fixedly connected to the top of the support frame, a top plate fixedly connected to the top of the base plate via support columns, a hydraulic cylinder at the center of the top plate, a fixed plate at the working end of the hydraulic cylinder, a pressure plate below the fixed plate, a pressure sensor on the top of the pressure plate, a balance cylinder on the surface of the top plate, a grating ruler displacement sensor on one side of the protective frame, an oil tank and a control box inside the support frame, a first hydraulic pump, a second hydraulic pump, a first solenoid valve and a second solenoid valve on the top of the oil tank, a controller inside the control box, and a flow sensor, an oil pressure sensor and an electro-hydraulic proportional valve on the oil supply line of the hydraulic cylinder. This invention relates to the field of hydraulic technology. This lifting control device and method for a CNC hydraulic press improves the machining accuracy and efficiency of the CNC hydraulic press.

Description

Technical Field

[0001] This invention relates to the field of hydraulic technology, specifically to a lifting control device and control method for a CNC hydraulic press. Background Technology

[0002] In today's industrial sector, hydraulic presses are widely used in machinery and engineering fields as important industrial equipment. The accuracy and stability of the lifting control device of a hydraulic press have a crucial impact on the processing quality. However, existing lifting control devices often suffer from insufficient accuracy, slow response speed, and high maintenance costs, which limit the application of CNC hydraulic presses in high-end manufacturing fields.

[0003] Secondly, during the hydraulic process, the pressure plate of the existing hydraulic press is unevenly stressed due to the different hardness of the medium, which generates lateral force on the hydraulic rod, affecting the sealing performance of the hydraulic rod. At the same time, it will cause deformation of the pressure plate, affecting the accuracy of subsequent processing. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention proposes a lifting control device and control method for a CNC hydraulic press, aiming to solve the above-mentioned problems and improve the processing accuracy and efficiency of the CNC hydraulic press.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a lifting control device for a CNC hydraulic press, comprising a support frame, a base plate fixedly connected to the top of the support frame, support columns vertically fixedly connected to the four corners of the top of the base plate, a top plate fixedly connected to the top of the support columns, a hydraulic cylinder vertically arranged at the center of the top plate, a fixed plate arranged at the working end of the hydraulic cylinder, a pressure plate arranged below the fixed plate, a pressure sensor arranged on the top of the pressure plate, and four balance cylinders arranged on the surface of the top plate, the working ends of which extend to the top of the pressure plate. A protective frame is also provided on the top of the support frame, and a grating ruler displacement sensor is vertically arranged on one side of the inner wall of the protective frame. The movable end of the grating ruler displacement sensor is connected to one side of the pressure plate. The system is fixedly connected to the side. An oil tank and a control box are installed inside the support frame. A first hydraulic pump, a second hydraulic pump, a first solenoid valve, and a second solenoid valve are installed on the top of the oil tank. A controller is installed inside the control box. A flow sensor, an oil pressure sensor, and an electro-hydraulic proportional valve are installed on the oil supply line of the hydraulic cylinder. A touch screen is also installed on the top of the top plate. The output terminals of the pressure sensor, grating ruler displacement sensor, flow sensor, oil pressure sensor, and touch screen are connected to the input terminal of the controller. The control terminal of the controller is electrically connected to the electro-hydraulic proportional valve, the first hydraulic pump, the second hydraulic pump, the first solenoid valve, and the second solenoid valve. The controller adjusts the opening degree of the electro-hydraulic proportional valve and the rotational speed of the first and second hydraulic pumps. The controller controls the opening and closing of the first and second solenoid valves.

[0008] Preferably, the first and second solenoid valves are two-position four-way solenoid valves.

[0009] Preferably, the first hydraulic pump is connected to the inlet end of the first solenoid valve via a pipeline, one reversing port of the first solenoid valve is connected to the inlet end of the hydraulic cylinder via an oil supply pipeline, the other reversing port of the first solenoid valve is connected to the outlet end of the hydraulic cylinder via a return oil pipeline, and the outlet end of the first solenoid valve is connected to the oil tank via a pipeline.

[0010] Preferably, the number of the second solenoid valve and the pressure sensor is the same as the number of the balance cylinders, the second hydraulic pump is connected to the inlet end of the second solenoid valve through a pipeline, and the pressure sensor is set at the position corresponding to the working end of the balance cylinder.

[0011] Preferably, a connecting rod is vertically fixed to the top of the pressure plate, one end of the connecting rod passes through the fixing plate and is threaded with a fixing nut, and the surface of the fixing plate is provided with a through hole adapted to the connecting rod. When the pressure plate is fixed to the bottom of the fixing plate by the fixing nut, the pressure sensor is not compressed.

[0012] Preferably, a heat dissipation filter is provided on one side of the oil tank, and the heat dissipation filter is connected to the oil tank.

[0013] Preferably, the surface of the pressure plate is provided with guide holes adapted to the support column.

[0014] A control method for a lifting control device of a CNC hydraulic press includes the following steps:

[0015] S1. After setting the lifting speed and height via the touchscreen, start the device;

[0016] S2. The controller starts the first hydraulic pump and opens the first solenoid valve to the relevant position, the hydraulic cylinder starts, the lifting displacement signal of the hydraulic press is obtained through the grating ruler displacement sensor, and the parameters in the lifting process are detected in real time through the flow sensor and oil pressure sensor. The controller adjusts the opening degree of the electro-hydraulic proportional valve and the speed of the first hydraulic pump according to the data to ensure the accuracy and stability of the lifting process.

[0017] S3. During the descent of the hydraulic cylinder, compare the numerical differences between the pressure sensors. For the pressure sensor with the smaller value, activate the corresponding balance cylinder so that one end of the balance cylinder applies pressure to the top of the fixed plate, thereby reducing the numerical differences between the pressure sensors.

[0018] Preferably, in step S3, the pressure value with the largest value is used as a reference, and pressure is applied to the area with the smaller value through the corresponding balance cylinder to reduce the difference between the pressure value and the largest value.

[0019] (III) Beneficial Effects

[0020] This invention provides a lifting control device and control method for a CNC hydraulic press. It has the following beneficial effects:

[0021] (1) By using sensors to detect the position, speed, pressure and flow during the lifting process, the sensors feed back the detected data to the controller. The controller adjusts the opening of the electro-hydraulic proportional valve and the speed of the hydraulic pump based on these data, which can accurately control the lifting speed and height, ensure the accuracy and stability of the lifting process, and meet the strict requirements of industrial production for lifting accuracy.

[0022] (2) By setting up a balance cylinder and pressure sensor, the pressure plate surface is ensured to be uniformly pressed, and the hydraulic rod is prevented from being subjected to bending moment, thereby ensuring the sealing of the hydraulic rod and ensuring the subsequent processing accuracy. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the fixing plate of the present invention;

[0025] Figure 3 For the present invention Figure 1 Enlarged view of point A in the middle;

[0026] Figure 4 This is a diagram of the pressure system of the hydraulic cylinder of the present invention.

[0027] In the diagram: 1-Support frame, 2-Base plate, 3-Support column, 4-Top plate, 5-Hydraulic cylinder, 6-Fixing plate, 7-Pressure plate, 8-Connecting rod, 9-Fixing nut, 10-Pressure sensor, 11-Balance cylinder, 12-Protective frame, 13-Raster ruler displacement sensor, 14-Oil tank, 15-Cooling filter, 16-First hydraulic pump, 17-First solenoid valve, 18-Second hydraulic pump, 19-Second solenoid valve, 20-Control box, 21-Controller, 22-Flow sensor, 23-Oil pressure sensor, 24-Electro-hydraulic proportional valve, 25-Touch screen. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-4 This invention provides a technical solution: a lifting control device for a CNC hydraulic press, comprising a support frame 1, a base plate 2 fixedly connected to the top of the support frame 1, support columns 3 vertically fixedly connected to the four corners of the top of the base plate 2, a top plate 4 fixedly connected to the top of the support columns 3, limiting blocks adapted to the top plate 4 provided on the surface of the support columns 3, a fixing block for fixing the top plate 4 provided at the top of the support columns 3, a hydraulic cylinder 5 vertically arranged at the center of the top plate 4, the hydraulic cylinder 5 being fixed to the center of the top plate 4 by bolts, a fixing plate 6 provided at the working end of the hydraulic cylinder 5, a pressure plate 7 provided below the fixing plate 6, a pressure sensor 10 provided at the top of the pressure plate 7, a connecting rod 8 vertically fixedly connected to the top of the pressure plate 7, one end of the connecting rod 8 penetrating the fixing plate 6 and threadedly connected to a fixing nut 9, a through hole adapted to the connecting rod 8 provided on the surface of the fixing plate 6, and the pressure sensor 10 being unpressed when the pressure plate 7 is fixed to the bottom of the fixing plate 6 by the fixing nut 9.

[0030] The surface of the top plate 4 is also provided with a balance cylinder 11. There are four balance cylinders 11 and the working end extends to the top of the pressure plate 7. The balance cylinders 11 ensure that the pressure plate 7 is subjected to balanced force, avoid the extension rod of the hydraulic cylinder 5 from being subjected to bending moment, and improve the sealing performance of the hydraulic cylinder 5.

[0031] The top of the support frame 1 is also provided with a protective frame 12. A grating ruler displacement sensor 13 is vertically installed on one side of the inner wall of the protective frame 12. The movable end of the grating ruler displacement sensor 13 is fixedly connected to one side of the pressure plate 7. The position, lifting speed and other information of the pressure plate 7 can be detected by the grating ruler displacement sensor.

[0032] The support frame 1 is equipped with an oil tank 14 and a control box 20. The top of the oil tank 14 is equipped with a first hydraulic pump 16, a second hydraulic pump 18, a first solenoid valve 17, and a second solenoid valve 19. The control box 20 is equipped with a controller 21. The oil supply line of the hydraulic cylinder 5 is equipped with a flow sensor 22, an oil pressure sensor 23, and an electro-hydraulic proportional valve 24. The top of the top plate 4 is also equipped with a touch screen 25, which serves as a human-machine interface for inputting lifting parameters and displaying lifting status. Users can set parameters such as lifting speed and height through the touch screen; the output terminals of pressure sensor 10, grating ruler displacement sensor 13, flow sensor 22, oil pressure sensor 23 and touch screen 25 are connected to the input terminal of controller 21. The control terminal of controller 21 is electrically connected to electro-hydraulic proportional valve 24, first hydraulic pump 16, second hydraulic pump 18, first solenoid valve 17 and second solenoid valve 19. Controller 21 adopts a programmable controller as the core of the control system. Controller 21 is responsible for receiving and processing signals from touch screen 25 and pressure sensor 10, grating ruler displacement sensor 13, flow sensor 22 and oil pressure sensor 23, and controlling the action of the actuator according to the preset program. Controller 21 adjusts the opening degree of electro-hydraulic proportional valve 24 and the rotation speed of first hydraulic pump 16 and second hydraulic pump 18. Controller 21 controls the opening and closing of first solenoid valve 17 and second solenoid valve 19.

[0033] The first solenoid valve 17 and the second solenoid valve 19 are two-position four-way solenoid valves.

[0034] The first hydraulic pump 16 is connected to the inlet end of the first solenoid valve 17 through a pipeline. One reversing port of the first solenoid valve 17 is connected to the inlet end of the hydraulic cylinder 5 through an oil supply pipeline. The other reversing port of the first solenoid valve 17 is connected to the outlet end of the hydraulic cylinder 5 through a return oil pipeline. The outlet end of the first solenoid valve 17 is connected to the oil tank 14 through a pipeline.

[0035] The number of second solenoid valves 19 and pressure sensors 10 is the same as the number of balance cylinders 11. The second hydraulic pump 18 is connected to the inlet end of the second solenoid valve 19 through a pipeline. The pressure sensor 10 is set at the position corresponding to the working end of the balance cylinder 11, and the connection method with the balance cylinder 11 is the same as that of the hydraulic cylinder 5.

[0036] A cooling filter 15 is provided on one side of the oil tank 14. The cooling filter 15 is connected to the oil tank 14. The cooling filter 15 can reduce the oil temperature, prevent the hydraulic oil performance and hydraulic system stability from being affected by excessive oil temperature, remove impurities in the hydraulic oil, maintain the cleanliness of the oil, and extend the service life of hydraulic components.

[0037] The surface of the pressure plate 7 is provided with guide holes that are compatible with the support column 3.

[0038] A control method for a lifting control device of a CNC hydraulic press includes the following steps:

[0039] S1. After setting the lifting speed and height via the touch screen 25, start the device;

[0040] S2. The controller 21 starts the first hydraulic pump 16 and opens the first solenoid valve 17 to the relevant position. The hydraulic cylinder 5 starts. The lifting displacement signal of the hydraulic press is obtained through the grating ruler displacement sensor 13. The parameters during the lifting process are detected in real time through the flow sensor 22 and the oil pressure sensor 23. The controller 21 adjusts the opening degree of the electro-hydraulic proportional valve 24 and the speed of the first hydraulic pump 16 according to the data to ensure the accuracy and stability of the lifting process.

[0041] S3. During the descent of the hydraulic cylinder 5, compare the numerical differences between each pressure sensor 10. For the pressure sensor with a smaller value, activate the corresponding balance cylinder 11 so that one end of the balance cylinder 11 applies pressure to the top of the fixed plate 6, thereby reducing the numerical differences between each pressure sensor 10.

[0042] In step S3, the pressure value with the largest value is used as a reference, and pressure is applied to the area with the smaller value through the corresponding balance cylinder 11 to reduce the difference between the pressure value and the largest value.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lifting control device for a CNC hydraulic press, comprising a support frame (1), a base plate (2) fixedly connected to the top of the support frame (1), support columns (3) vertically fixedly connected to the four corners of the top of the base plate (2), and a top plate (4) fixedly connected to the top of the support columns (3), characterized in that: A hydraulic cylinder (5) is vertically installed at the center of the top plate (4). A fixed plate (6) is installed at the working end of the hydraulic cylinder (5). A pressure plate (7) is installed below the fixed plate (6). A pressure sensor (10) is installed on the top of the pressure plate (7). A balance cylinder (11) is installed on the surface of the top plate (4). Four balance cylinders (11) are installed, and their working ends extend to the top of the pressure plate (7). A protective frame (12) is installed on the top of the support frame (1). A grating ruler displacement sensor (13) is vertically installed on one side of the inner wall of the protective frame (12). The movable end of the grating ruler displacement sensor (13) is fixedly connected to one side of the pressure plate (7). An oil tank (14) and a control box (20) are installed inside the support frame (1). A first hydraulic pump (16), a second hydraulic pump (18), a first solenoid valve (17), and a second solenoid valve (19) are installed on the top of the oil tank (14). The control box (20) is equipped with a controller (21). The oil supply line of the hydraulic cylinder (5) is equipped with a flow sensor (22), an oil pressure sensor (23), and an electro-hydraulic proportional valve (24). The top of the top plate (4) is also equipped with a touch screen (25). The output ends of the pressure sensor (10), the grating ruler displacement sensor (13), the flow sensor (22), the oil pressure sensor (23), and the touch screen (25) are connected to the input end of the controller (21). The control end of the controller (21) is electrically connected to the electro-hydraulic proportional valve (24), the first hydraulic pump (16), the second hydraulic pump (18), the first solenoid valve (17), and the second solenoid valve (19). The controller (21) adjusts the opening degree of the electro-hydraulic proportional valve (24) and the rotation speed of the first hydraulic pump (16) and the second hydraulic pump (18). The controller (21) controls the opening and closing of the first solenoid valve (17) and the second solenoid valve (19).

2. The lifting control device for a CNC hydraulic press according to claim 1, characterized in that: The first solenoid valve (17) and the second solenoid valve (19) are two-position four-way solenoid valves.

3. The lifting control device for a CNC hydraulic press according to claim 2, characterized in that: The first hydraulic pump (16) is connected to the inlet end of the first solenoid valve (17) through a pipeline. One reversing port of the first solenoid valve (17) is connected to the inlet end of the hydraulic cylinder (5) via an oil supply pipeline. The other reversing port of the first solenoid valve (17) is connected to the outlet end of the hydraulic cylinder (5) via a return oil pipeline. The outlet end of the first solenoid valve (17) is connected to the oil tank (14) through a pipeline.

4. The lifting control device for a CNC hydraulic press according to claim 2, characterized in that: The number of the second solenoid valve (19) and pressure sensor (10) is the same as the number of the balance cylinder (11). The second hydraulic pump (18) is connected to the inlet end of the second solenoid valve (19) through a pipeline. The pressure sensor (10) is set at the position corresponding to the working end of the balance cylinder (11).

5. The lifting control device for a CNC hydraulic press according to claim 1, characterized in that: A connecting rod (8) is vertically fixed to the top of the pressure plate (7). One end of the connecting rod (8) passes through the fixing plate (6) and is threaded with a fixing nut (9). The surface of the fixing plate (6) is provided with a through hole that matches the connecting rod (8). When the pressure plate (7) is fixed to the bottom of the fixing plate (6) by the fixing nut (9), the pressure sensor (10) is not under pressure.

6. The lifting control device for a CNC hydraulic press according to claim 1, characterized in that: A heat dissipation filter (15) is provided on one side of the oil tank (14), and the heat dissipation filter (15) is connected to the oil tank (14).

7. The lifting control device for a CNC hydraulic press according to claim 1, characterized in that: The surface of the pressure plate (7) is provided with guide holes that are adapted to the support column (3).

8. The control method of a CNC hydraulic press lifting control device according to any one of claims 1-7, characterized in that: Includes the following steps: S1. After setting the lifting speed and height via the touch screen (25), start the device; S2. The controller (21) starts the first hydraulic pump (16) and opens the first solenoid valve (17) to the relevant position. The hydraulic cylinder (5) starts and obtains the lifting displacement signal of the hydraulic press through the grating ruler displacement sensor (13). The parameters in the lifting process are detected in real time through the flow sensor (22) and the oil pressure sensor (23). The controller (21) adjusts the opening degree of the electro-hydraulic proportional valve (24) and the speed of the first hydraulic pump (16) according to the data to ensure the accuracy and stability of the lifting process. S3. During the descent of the hydraulic cylinder (5), compare the numerical differences between each pressure sensor (10), and activate the corresponding balance cylinder (11) for the pressure sensor with the smaller value, so that one end of the balance cylinder (11) applies pressure to the top of the fixed plate (6) to reduce the numerical differences between each pressure sensor (10).

9. The control method for a lifting control device of a CNC hydraulic press according to claim 8, characterized in that: In step S3, the pressure value with the largest value is used as a reference, and pressure is applied to the smaller value through the corresponding balance cylinder (11) to reduce the gap with the largest pressure value.

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