Lifting control device of numerical control hydraulic machine and control method of lifting control device

Abstract

The invention discloses a numerical control hydraulic machine lifting control device and a control method thereof.The numerical control hydraulic machine lifting control device comprises a supporting frame, a bottom plate is fixedly connected to the top of the supporting frame, a top plate is fixedly connected to the top of the bottom plate through a supporting column, a hydraulic cylinder is arranged in the center of the top plate, and a fixing plate is arranged at the working end of the hydraulic cylinder; a pressing plate is arranged below the fixing plate, a pressure sensor is further arranged on the top of the pressing plate, a balance oil cylinder is further arranged on the surface of the top plate, a grating ruler displacement sensor is arranged on one side of the protection frame, an oil tank and a control box are arranged in the supporting frame, and a first hydraulic pump, a second hydraulic pump, a first electromagnetic valve and a second electromagnetic valve are arranged on the top of the oil tank. A controller is arranged in the control box, and a flow sensor, an oil pressure sensor and an electro-hydraulic proportional valve are arranged on an oil supply pipeline of the hydraulic cylinder. According to the numerical control hydraulic machine lifting control device and the control method thereof, the machining precision and efficiency of the numerical control hydraulic machine are improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, and in particular to a numerical control hydraulic press lifting control device and a control method thereof. Background Art

[0002] In the current industrial field, hydraulic presses are important industrial equipment and are widely used in the fields of machinery and engineering. The accuracy and stability of the hydraulic press lifting control device have a vital impact on the processing quality. However, existing lifting control devices often have problems such as insufficient accuracy, slow response speed, and high maintenance cost, which limits the application of CNC hydraulic presses in the field of high-end manufacturing.

[0003] Secondly, during the hydraulic process of the existing hydraulic press, the pressure panel is unevenly stressed due to the different hardness of the medium, which generates lateral force on the hydraulic rod, affecting the sealing of the hydraulic rod and causing deformation of the pressure panel, affecting the accuracy of subsequent processing. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention proposes a CNC hydraulic press lifting control device and a control method thereof, aiming to solve the above problems and improve the machining accuracy and efficiency of the CNC hydraulic press.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a CNC hydraulic press lifting control device comprises a support frame, the top of the support frame is fixedly connected to a bottom plate, the four corners of the top of the bottom plate are vertically fixedly connected to support columns, the top of the support column is fixedly connected to a top plate, a hydraulic cylinder is vertically arranged at the center of the top plate, a fixed plate is arranged at the working end of the hydraulic cylinder, a pressure plate is arranged below the fixed plate, a pressure sensor is also arranged on the top of the pressure plate, a balancing oil cylinder is also arranged on the surface of the top plate, four balancing oil cylinders are arranged and the working ends extend to the top of the pressure plate, a protective frame is also arranged on the top of the support frame, a grating scale displacement sensor is vertically arranged on one side of the inner wall of the protective frame, and the movable end of the grating scale displacement sensor is aligned with one end of the pressure plate The support frame is fixedly connected on the side, an oil tank and a control box are arranged in the support frame, a first hydraulic pump, a second hydraulic pump, a first solenoid valve and a second solenoid valve are arranged on the top of the oil tank, a controller is arranged in the control box, a flow sensor, an oil pressure sensor and an electro-hydraulic proportional valve are arranged on the oil supply pipeline of the hydraulic cylinder, a touch screen is also arranged on the top of the top plate, the output ends of the pressure sensor, the grating scale displacement sensor, the flow sensor, the oil pressure sensor and the touch screen are connected to the input end of the controller, the control end 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 of the electro-hydraulic proportional valve and the rotational speed of the first hydraulic pump and the second hydraulic pump, and the controller controls the opening and closing of the first solenoid valve and the second solenoid valve.

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

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

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

[0011] Preferably, a connecting rod is vertically fixedly connected to the top of the pressure plate, one end of the connecting rod passes through the fixing plate and is threadedly connected to a fixing nut, and a through hole matching the connecting rod is provided on the surface of the fixing plate. When the pressure plate is fixed to the bottom of the fixing plate by the fixing nut, the pressure sensor is not under pressure.

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

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

[0014] A control method for a lifting control device of a numerically controlled hydraulic press comprises the following steps:

[0015] S1. Set the lifting speed and height through the touch screen and 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, the parameters in the lifting process are detected in real time through the flow sensor and the oil pressure sensor, and the controller adjusts the opening 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. When the hydraulic cylinder is lowered, the numerical differences between the pressure sensors are compared, and the balancing cylinder at the corresponding position of the pressure sensor with a smaller numerical value is activated, so that one end of the balancing cylinder applies pressure to the top of the fixed plate, thereby reducing the numerical differences between the pressure sensors.

[0018] Preferably, in step S3, taking the maximum pressure value as a reference, the balancing oil cylinder at the corresponding position applies pressure to the smaller value to reduce the difference between the pressure value and the maximum pressure value.

[0019] (III) Beneficial effects

[0020] The present invention provides a CNC hydraulic press lifting control device and a control method thereof, which have the following beneficial effects:

[0021] (1) By using sensors to detect the position, speed, pressure and flow during the lifting process, the sensors will 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 balancing cylinder and a pressure sensor, the pressure on the pressure plate surface is guaranteed to be uniform, and the hydraulic rod is prevented from being subjected to bending moment, thereby ensuring the sealing of the hydraulic rod and the subsequent processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 It is a structural schematic diagram 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 It is a pressure system diagram of the hydraulic cylinder of the present invention.

[0027] In the figure: 1-support frame, 2-bottom plate, 3-support column, 4-top plate, 5-hydraulic cylinder, 6-fixed plate, 7-pressure plate, 8-connecting rod, 9-fixing nut, 10-pressure sensor, 11-balance cylinder, 12-protection frame, 13-grating scale 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 DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-4 The present invention provides a technical solution: a lifting control device for a numerically controlled hydraulic press, comprising a support frame 1, a bottom plate 2 is fixedly connected to the top of the support frame 1, support columns 3 are vertically fixedly connected at the four corners of the top of the bottom plate 2, a top plate 4 is fixedly connected to the top of the support column 3, a limit block adapted to the top plate 4 is arranged on the surface of the support column 3, a fixing block for fixing the top plate 4 is also arranged on the top of the support column 3, a hydraulic cylinder 5 is vertically arranged at the center of the top plate 4, the hydraulic cylinder 5 is fixed to the center of the top plate 4 by bolts, a fixing plate 6 is arranged at the working end of the hydraulic cylinder 5, a pressing plate 7 is arranged below the fixing plate 6, a pressure sensor 10 is also arranged on the top of the pressing plate 7, a connecting rod 8 is vertically fixedly connected to the top of the pressing plate 7, one end of the connecting rod 8 passes through the fixing plate 6 and is threadedly connected with a fixing nut 9, a through hole adapted to the connecting rod 8 is arranged on the surface of the fixing plate 6, and the pressure sensor 10 is not subjected to pressure when the pressing 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 balancing cylinder 11. There are four balancing cylinders 11 and the working ends extend to the top of the pressure plate 7. The balancing cylinders 11 ensure that the pressure plate 7 is subjected to balanced force at all locations, avoid bending moment on the telescopic rod of the hydraulic cylinder 5, and improve the sealing of the hydraulic cylinder 5.

[0031] A protective frame 12 is also provided on the top of the support frame 1, and a grating scale displacement sensor 13 is vertically provided on one side of the inner wall of the protective frame 12. The movable end of the grating scale displacement sensor 13 is fixedly connected to one side of the pressure plate 7. The grating scale displacement sensor can detect information such as the position and lifting speed of the pressure plate 7.

[0032] An oil tank 14 and a control box 20 are provided in 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 provided on the top of the oil tank 14. A controller 21 is provided in the control box 20. A flow sensor 22, an oil pressure sensor 23 and an electro-hydraulic proportional valve 24 are provided on the oil supply pipeline of the hydraulic cylinder 5. A touch screen 25 is also provided on the top of the top plate 4. The touch screen 25 serves as a human-computer interaction interface for inputting lifting parameters and displaying the lifting status. The user can set parameters such as lifting speed and height through the touch screen; the output ends of the pressure sensor 10, the grating scale 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, and 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 adopts a programmable controller as the core of the control system. The controller 21 is responsible for receiving and processing signals from the touch screen 25 and the pressure sensor 10, the grating scale displacement sensor 13, the flow sensor 22, and the oil pressure sensor 23, and controls the action of the actuator according to a preset program. The controller 21 adjusts the opening 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.

[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 liquid 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 liquid outlet end of the hydraulic cylinder 5 through an oil return pipeline, and the oil outlet end of the first solenoid valve 17 is connected to the oil tank 14 through a pipeline.

[0035] The number of the second solenoid valves 19 and the pressure sensors 10 is the same as the number of the balancing 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 arranged at a position corresponding to the working end of the balancing cylinder 11, and the connection method with the balancing cylinder 11 is the same as that of the hydraulic cylinder 5.

[0036] 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. The setting of the heat dissipation filter 15 can reduce the oil temperature to prevent the performance of the hydraulic oil and the stability of the hydraulic system from being affected by the excessively high oil temperature. It can also remove impurities in the hydraulic oil, maintain the cleanliness of the oil, and extend the service life of the hydraulic components.

[0037] The surface of the pressing plate 7 is provided with guide holes adapted to the supporting columns 3 .

[0038] A control method for a lifting control device of a numerically controlled hydraulic press comprises the following steps:

[0039] S1, after setting the lifting speed and height through 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 in the lifting process are detected in real time through the flow sensor 22 and the oil pressure sensor 23, and the controller 21 adjusts the opening 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. When the hydraulic cylinder 5 is lowered, the numerical differences between the pressure sensors 10 are compared, and the balancing cylinder 11 at the corresponding position of the pressure sensor with a smaller numerical value is activated, so that one end of the balancing cylinder 11 applies pressure to the top of the fixed plate 6, thereby reducing the numerical differences between the pressure sensors 10.

[0042] In step S3, taking the maximum pressure value as a reference, the balancing oil cylinder 11 at the corresponding position applies pressure to the smaller value to reduce the difference between the maximum pressure value and the smaller value.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

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

Claims

1. A CNC hydraulic press lifting control device, comprising a support frame (1), the top of the support frame (1) is fixedly connected to a bottom plate (2), the top four corners of the bottom plate (2) are vertically fixedly connected to support columns (3), the top of the support column (3) is fixedly connected to a top plate (4), characterized in that: A hydraulic cylinder (5) is vertically arranged at the center of the top plate (4), a fixed plate (6) is arranged at the working end of the hydraulic cylinder (5), a pressure plate (7) is arranged below the fixed plate (6), and a pressure sensor (10) is also arranged on the top of the pressure plate (7). A balancing oil cylinder (11) is also arranged on the surface of the top plate (4), and four balancing oil cylinders (11) are arranged, and the working ends of the balancing oil cylinders (11) extend to the top of the pressure plate (7). A protective frame (12) is also arranged on the top of the support frame (1), and a grating scale displacement sensor (13) is vertically arranged on one side of the inner wall of the protective frame (12), and the movable end of the grating scale displacement sensor (13) is fixedly connected to one side of the pressure plate (7). An oil tank (14) and a control box (20) are arranged in the support frame (1), and a first hydraulic pump (16), a second hydraulic pump (18), a first solenoid valve (17) and a second solenoid valve (19) are arranged on the top of the oil tank (14). A controller (21) is arranged in the control box (20); a flow sensor (22), an oil pressure sensor (23) and an electro-hydraulic proportional valve (24) are arranged on the oil supply pipeline of the hydraulic cylinder (5); a touch screen (25) is also arranged on the top of the top plate (4); the output ends of the pressure sensor (10), the grating scale 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 of the electro-hydraulic proportional valve (24) and the rotation speeds of the first hydraulic pump (16) and the second hydraulic pump (18); and 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 of a CNC hydraulic press according to claim 1 is 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 of a numerically controlled hydraulic press according to claim 2 is 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 liquid 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 liquid outlet end of the hydraulic cylinder (5) via an oil return pipeline, and the oil outlet end of the first solenoid valve (17) is connected to the oil tank (14) through a pipeline.

4. The lifting control device of a numerically controlled hydraulic press according to claim 2, characterized in that: The number of the second solenoid valves (19) and the pressure sensors (10) is the same as the number of the balancing oil cylinders (11); the second hydraulic pump (18) is connected to the inlet end of the second solenoid valve (19) through a pipeline; and the pressure sensor (10) is arranged at a position corresponding to the working end of the balancing oil cylinder (11).

5. The lifting control device of a numerically controlled hydraulic press according to claim 1, characterized in that: The top of the pressure plate (7) is vertically fixedly connected with a connecting rod (8), one end of which passes through the fixing plate (6) and is threadedly connected with a fixing nut (9), and the surface of the fixing plate (6) is provided with a through hole adapted to the connecting rod (8), and 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 subjected to pressure.

6. The lifting control device of a numerically controlled 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 in communication with the oil tank (14).

7. The lifting control device of a numerically controlled hydraulic press according to claim 1, characterized in that: The surface of the pressing plate (7) is provided with a guide hole adapted to the supporting column (3).

8. A control method for a lifting control device of a numerically controlled hydraulic press according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, after setting the lifting speed and height through 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 a 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 in the lifting process are detected in real time through the flow sensor (22) and the oil pressure sensor (23), and the controller (21) adjusts the opening of the electro-hydraulic proportional valve (24) and the rotation speed of the first hydraulic pump (16) according to the data to ensure the accuracy and stability of the lifting process; S3. When the hydraulic cylinder (5) is lowered, the numerical differences between the pressure sensors (10) are compared, and the balancing cylinder (11) at the corresponding position of the pressure sensor with a smaller numerical value is activated, so that one end of the balancing cylinder (11) applies pressure to the top of the fixed plate (6), thereby reducing the numerical differences between the pressure sensors (10).

9. The control method of the lifting control device of a numerical control hydraulic press according to claim 8, characterized in that: In step S3, taking the maximum pressure value as a reference, the balancing oil cylinder (11) at the corresponding position applies pressure to the smaller value to reduce the difference between the maximum pressure value and the pressure value.

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