A precise die height control device and method for a press

Abstract

The present invention discloses a precise die height control device and method for a press in the field of press control, comprising a hydraulic mechanism, wherein the hydraulic mechanism is connected to a hydraulic motor, the hydraulic motor is connected to a worm, the worm is respectively connected to a die height pushing mechanism and a two-way detection mechanism, the die height pushing mechanism is connected to a slider, the slider is connected to a machine body via a vertical guide rail, the two-way detection mechanism is connected to a variable programmable controller, the programmable controller is connected to the hydraulic mechanism, and the programmable controller is connected to a touch screen; the slider is driven up and down by the die height pushing mechanism to realize the up and down movement of the die, while the two-way detection mechanism respectively performs 0.01-digit counting display and die height setting control, thereby realizing automatic adjustment of the die height, improving the accuracy of the die height, achieving 0.01-digit accuracy, and enabling fast and precise positioning, greatly improving production efficiency, and reducing costs.

Description

Technical Field

[0001] The invention relates to a precise die height control device and method in the field of press control. Background Art

[0002] Currently, conventional presses use a 0.1-digit precision digital display coupled with a brake motor to control the die height. This method addresses the needs of most customers. However, when stamping high-precision products, particularly those requiring 0.01-digit accuracy, this method cannot meet these requirements due to the mechanical characteristics of the brake motor. Summary of the Invention

[0003] The purpose of the present invention is to provide a precise die height control device and method for a press, which improves the accuracy of the die height to 0.01 digit accuracy and can quickly and accurately position, greatly improving production efficiency and reducing costs.

[0004] To achieve the above-mentioned purpose, the present invention provides a precise die height control device for a press, comprising a power mechanism, the power mechanism being connected to a worm, the worm being respectively connected to a die height pushing mechanism and a two-way detection mechanism, the die height pushing mechanism being connected to a slider, the slider being connected to a body through a vertical guide rail, the two-way detection mechanism being connected to a variable programmable controller, the programmable controller being connected to a hydraulic mechanism, and the programmable controller being connected to a touch screen.

[0005] Compared with the existing technology, the beneficial effect of the present invention is that the worm is driven to rotate by the power mechanism, and then the slider is driven to move up and down by the mold height pushing mechanism to realize the up and down movement of the mold, and the two-way detection mechanism respectively performs 0.01-digit counting display and mold height setting control, thereby realizing automatic adjustment of the mold height, improving the accuracy of the mold height, achieving 0.01-digit accuracy, and can quickly and accurately position, greatly improving production efficiency and reducing costs.

[0006] As a further improvement of the present invention, the mold height pushing mechanism includes a turbine that cooperates with the worm, the turbine sleeve is arranged on the adjusting screw, the adjusting screw sleeve is provided with a screw sleeve, the screw sleeve is embedded in the wedge block, the wedge block is arranged between the upper seat and the slider, the upper seat is fixed on the frame, the bottom of the upper seat is provided with a beveled copper plate, the beveled copper plate cooperates with the top bevel of the wedge block, the top of the slider is provided with a horizontal guide rail, the bottom of the wedge block cooperates with the horizontal guide rail to connect the slider, a wedge guide rail is provided on the fuselage, the wedge block is sleeved on the wedge guide rail, the wedge block is equipped with an upper proximity switch and a lower proximity switch, the upper proximity switch and the lower proximity switch correspond to the two ends of the wedge block respectively.

[0007] In this way, the worm drives the turbine to rotate, which in turn causes the adjusting screw to rotate, causing the screw sleeve to move back and forth along the axial direction of the adjusting screw, and the screw sleeve carries the wedge block to move back and forth along the inclined copper plate at the bottom of the upper seat. Since the upper seat is fixed to the machine body, the wedge block moves simultaneously in the horizontal and vertical directions along the wedge guide rail, and moves back and forth in the horizontal direction along the horizontal guide rail at the top of the slider, while also driving the slider to move up and down. Since the mold is installed at the bottom of the slider, the up and down movement of the mold is realized; when the lower proximity switch senses the front end of the wedge block, it means that the slider can no longer move down, and when the upper proximity switch senses the rear end of the wedge block, it means that the slider can no longer move up.

[0008] As a further improvement of the present invention, the two-way detection mechanism includes a master pulley and a slave pulley, the master pulley is sleeved on the lower end of the worm, and the slave pulley is sleeved on the signal detection shaft. The master pulley and the slave pulley are connected by a synchronous belt. The upper end of the signal detection shaft is connected to a soft shaft, and the soft shaft is connected to a 0.01-bit electronic display. The lower end of the signal detection shaft is connected to an encoder, and the encoder and the electronic display are both connected to a programmable controller.

[0009] In this way, the worm rotates, which in turn drives the main pulley to rotate, and the synchronous pulley drives the slave pulley to rotate, thereby realizing a 1:1 transmission between the worm and the signal detection shaft. The rotation of the signal detection shaft, on the one hand, displays the rotation data on the electronic display through the flexible shaft, and on the other hand, reads it through the encoder and transmits it to the programmable controller, which then processes it and displays it on the touch screen. Through the setting of the touch screen, the adjustment and precise control of different mold heights can be achieved.

[0010] As a further improvement of the present invention, the transmission ratio between the worm and the slider is 1:0.01, the transmission ratio between the worm and the signal detection shaft is 1:1, the transmission ratio between the signal detection shaft and the encoder is 1:1, and the transmission ratio between the signal detection shaft and the flexible shaft is 1:1.

[0011] In this way, the transmission ratio can be 1:0.01, the worm rotates one circle, and the slider drives the mold height to move up and down 0.01 times the worm rotates one circle, thereby achieving 0.01-bit precision control.

[0012] As a further improvement of the present invention, the hydraulic mechanism includes an oil tank, which is connected to an oil outlet pipe, which is connected to an electric motor arranged on the oil tank, and a check valve and a pressure gauge are provided on the oil outlet pipe. The oil outlet pipe is connected to the hydraulic motor via a three-position four-way solenoid valve, the hydraulic motor is connected to the worm gear, and the hydraulic motor is also connected to the return oil pipe, which is connected to the oil tank via a three-position four-way solenoid valve. A pressure relief pipe is connected to the oil outlet pipe at a position between the check valve and the electric motor, and a built-in pressure relief valve is provided on the pressure relief pipe.

[0013] In this way, the electric motor works to make the hydraulic pump replenish oil, and the rotation direction of the hydraulic motor is controlled by the three-position four-way solenoid valve. The pump station is equipped with a pressure relief valve, which relieves pressure when the set pressure is exceeded to play a protective role.

[0014] To achieve the above-mentioned purpose, the present invention also provides a method for accurately controlling the die height of a press, the specific contents of which are as follows: step 1, the hydraulic motor drives the worm to rotate, and the rotation of the worm drives the slider to move up and down through the die height pushing mechanism; step 2, the rotation data of the worm is sent to the programmable controller through two detection mechanisms; step 3, the programmable controller processes the data in step 2 and controls the start and stop of the hydraulic mechanism.

[0015] This allows the electronic display to directly display and output digital signals to the programmable controller. The encoder's pulse signal is transmitted to the programmable controller via the CC-LINK communication protocol. The controller then calculates the signal and displays it on the touch screen. The programmable controller uses the dual-circuit signals (digital and digital) to perform logic analysis and control the mold height adjustment motor and the raising and lowering solenoid valves.

[0016] As a further improvement of the present invention, the specific contents of step 1 are as follows:

[0017] The hydraulic motor drives the worm to rotate, and the worm drives the adjusting screw to rotate through the worm gear, thereby causing the screw sleeve to move back and forth along the axial direction of the adjusting screw. The wedge block moves back and forth along the axial direction of the adjusting screw under the drive of the screw sleeve. In this way, when the wedge block moves forward along the inclined copper plate at the bottom of the upper seat, it will also move downward along the inclined copper plate at the same time, that is, the wedge block will move forward along the wedge guide rail, so that the wedge block will move forward along the horizontal guide rail at the top of the slider at the same time, and at the same time, it will press the slider to move downward along the vertical guide rail on the fuselage, thereby driving the mold to move downward; in this way, when the wedge block moves backward along the inclined copper plate at the bottom of the upper seat, it will also move upward along the inclined copper plate at the same time, that is, the wedge block will move backward along the wedge guide rail, so that the wedge block will move backward along the horizontal guide rail at the top of the slider at the same time, and at the same time, it will carry the slider upward along the vertical guide rail on the fuselage through the horizontal guide rail, thereby driving the mold to move upward.

[0018] In this way, the wedge block slides back and forth on the inclined copper plate at the bottom of the upper seat, so that the wedge block can move synchronously in the horizontal and vertical directions, that is, it moves forward horizontally and downward at the same time. In this way, when the wedge block moves forward along the wedge guide rail, it still presses the slider to move downward along the vertical guide rail, thereby realizing that the slider drives the mold to move downward. Conversely, the wedge block drives the slider to move upward, so that the mold is moved upward by the slider, realizing the up and down movement of the mold.

[0019] As a further improvement of the present invention, the specific content of step 2 is as follows:

[0020] The encoder reads the rotation data of the signal detection shaft and outputs the corresponding pulse signal. The pulse signal is transmitted to the programmable controller through the CC-LINK communication protocol. At the same time, the rotation data of the signal detection shaft is displayed on the electronic display through the flexible shaft, and the electronic display outputs the switch signal to the programmable controller.

[0021] In this way, the encoder and electronic display read the data of turbine rotation in two ways. One way is for the electronic display to read and display and output the switch signal to the programmable controller, thereby preventing the slider from exceeding the range through the switch signal; the other way is for the encoder to read the data and output the corresponding pulse signal to the programmable encoder, which displays the up and down movement of the slider in real time on the touch screen after processing.

[0022] As a further improvement of the present invention, the programmable controller separately calculates the pulse signal given by the encoder and displays it on the touch screen, so that the read value of the encoder is consistent with the actual mold height value after conversion, thereby making the entire device suitable for different mold heights, and thereby controlling the forward rotation and flipping of the hydraulic motor, thereby automatically controlling the up and down movement of the slider to achieve precise control of the mold height; the programmable controller receives the switch signal of the electronic display and processes it. Once the movement stroke of the slider reaches the set upper and lower limits, the programmable controller electric motor is turned off, causing the hydraulic motor to stop rotating; if the electronic display fails, then when the wedge block moves to the upper proximity switch and the lower proximity switch, the programmable controller receives the signals of the upper and lower proximity switches, controls the electric motor to turn off, causing the hydraulic motor to stop rotating.

[0023] As a further improvement of the present invention, in step 3, the programmable controller performs calibration calculations between the encoder value and the actual displacement value of the slider as follows: the real-time encoder reading value is set to D500, and the current value of the slider is set to D600 on the touch screen; the transmission ratio parameter is set to D601 on the touch screen, and the value of D601 is 1:0.01; the current encoder value is converted to D602, D602=D600 / D601*K, where the K value is the matching coefficient between the mold height and the encoder resolution; the absolute zero point value of the encoder is D605, D605 = D500-D602; thus, the actual mold height value measured by the encoder is D610, that is, D610 = (D500-D605) / K*D601=[D500-(D500-D602)] / K*D601.

[0024] In this way, the data comparison between the encoder and the initial position of the slider can be achieved through the above calculation method, and then the conversion relationship between the initial position of the slider and the encoder reading can be determined, so that the encoder reading can be converted into the corresponding mold height through the programmable controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the internal structure of the structure of the present invention.

[0026] Figure 2 It is a side view of the internal structure of the structure of the present invention.

[0027] Figure 3 It is the rear view of the structure of the present invention.

[0028] Figure 4 This is a connection diagram of the hydraulic mechanism of the present invention.

[0029] Figure 5 for Figure 1 A partial enlarged view of point A in the middle.

[0030] Figure 6 This is a control flow chart of the present invention.

[0031] Among them, 1 body, 2 hydraulic motor, 3 worm, 4 flexible shaft, 5 electronic counter, 6 turbine, 7 upper proximity switch, 8 upper seat, 9 inclined copper plate, 10 adjustment screw, 11 screw sleeve, 12 slider, 13 horizontal guide rail, 14 wedge block, 15 wedge guide rail, 16 lower proximity switch, 17 pressure relief valve, 18 solenoid valve, 19 pressure gauge, 20 electric motor, 21 oil outlet pipe, 22 pressure relief pipe, 23 oil return pipe, 24 oil tank, 25 signal detection shaft, 26 encoder, 27 slave pulley, 28 synchronous belt, 29 master pulley. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings:

[0033] like Figure 1-5 The device for controlling the precise die height of a press shown in the figure includes a hydraulic mechanism, which is connected to a hydraulic motor 2, which is connected to a worm 3, which is respectively connected to a die height pushing mechanism and a two-way detection mechanism, and the die height pushing mechanism is connected to a slider 12, which is equipped with an upper proximity switch 7 and a lower proximity switch 16, and the slider 12 is connected to the body 2 through a vertical guide rail, and the two-way detection mechanism is connected to a variable programmable controller, which is connected to the hydraulic mechanism, and the programmable controller is connected to the touch screen.

[0034] The bottom of the wedge block cooperates with the horizontal guide rail to connect the slider. A wedge guide rail 15 is provided on the fuselage. The wedge block is sleeved on the wedge guide rail 15. The wedge block is equipped with an upper proximity switch and a lower proximity switch 16. The upper proximity switch and the lower proximity switch 16 correspond to the two ends of the wedge block respectively.

[0035] The mold height pushing mechanism includes a turbine 6 that cooperates with the worm 3. The turbine 6 is sleeved on the adjusting screw 10. The adjusting screw 10 is sleeved with a screw sleeve 11, and the screw sleeve 11 is embedded in the wedge block 14. The wedge block 14 is arranged between the upper seat 8 and the slider 12. The upper seat 8 is fixed to the frame. The bottom of the upper seat 8 is provided with a bevel copper plate 9. The bevel copper plate 9 cooperates with the top bevel of the wedge block 14. The top of the slider 12 is provided with a horizontal guide rail 13. The bottom of the wedge block 14 cooperates with the horizontal guide rail 13 to connect the slider 12. The horizontal guide rail 13 cooperates with the bottom of the wedge block 14. A wedge guide rail 15 is provided on the fuselage 1. The wedge block 14 is sleeved on the wedge guide rail 15. The wedge block 14 is equipped with an upper proximity switch and a lower proximity switch 16. The upper proximity switch and the lower proximity switch 16 correspond to the two ends of the wedge block 14 respectively.

[0036] The two-way detection mechanism includes a main pulley 29 and a slave pulley 27. The main pulley 29 is sleeved on the lower end of the worm 3, and the slave pulley 27 is sleeved on the signal detection shaft 25. The main pulley 29 and the slave pulley 27 are connected by a synchronous belt 28. The upper end of the signal detection shaft 25 is connected to a soft shaft 4, and the soft shaft 4 is connected to a 0.01-bit electronic display 5. The lower end of the signal detection shaft 25 is connected to an encoder 26. The encoder 26 and the electronic display 5 are both connected to a programmable controller.

[0037] The worm gear has 40 teeth, the pitch of the adjusting screw 10 is 6, the slope of the wedge block 14 is 1:15, the transmission ratio between the worm 3 and the signal detection shaft 25 is 1:1, the transmission ratio between the signal detection shaft 25 and the encoder 26 is 1:1, and the transmission ratio between the signal detection shaft 25 and the soft shaft 4 is 1:1.

[0038] The hydraulic mechanism includes an oil tank 24, which is connected to an oil outlet pipe 21. The oil outlet pipe 21 is connected to an electric motor 20 arranged on the oil tank 24. A check valve and a pressure gauge 19 are provided on the oil outlet pipe 21. The oil outlet pipe 21 is connected to the hydraulic motor 2 via a three-position four-way solenoid valve 18. The hydraulic motor 2 is also connected to a return oil pipe 23. The return oil pipe 23 is connected to the oil tank 24 via a three-position four-way solenoid valve 18. A pressure relief pipe 22 is connected to the oil outlet pipe 21 at a position between the check valve and the electric motor 20. The pressure relief pipe 22 is provided with a built-in pressure relief valve 17.

[0039] like Figure 6 A method for controlling the precise die height of a press is shown in the figure, and the contents are as follows:

[0040] Step 1: The hydraulic motor 2 drives the worm 3 to rotate, and the rotation of the worm 3 drives the slider 12 to move up and down through the mold height pushing mechanism.

[0041] The hydraulic motor 2 drives the worm 3 to rotate, and the worm 3 drives the adjusting screw 10 to rotate through the worm gear, thereby causing the screw sleeve 11 to move forward and backward along the axial direction of the adjusting screw 10. The wedge block 14 moves forward and backward along the axial direction of the adjusting screw 10 under the drive of the screw sleeve 11. In this way, when the wedge block 14 moves forward along the inclined copper plate 9 at the bottom of the upper seat 8, it will also move downward along the inclined copper plate 9 at the same time, so that the wedge block 14 will simultaneously move forward along the horizontal guide rail 13 at the top of the slider 12. When the wedge block 14 moves backward along the inclined copper plate 9 at the bottom of the upper seat 8, it will also move upward along the inclined copper plate 9. In this way, the wedge block 14 will move backward along the horizontal guide rail 13 at the top of the slider 12, and at the same time, it will move upward along the vertical guide rail on the fuselage 2 with the slider 12 through the horizontal guide rail 13, thereby driving the mold to move upward.

[0042] Step 2: The rotation data of the worm 3 is sent to the programmable controller through two detection mechanisms.

[0043] The encoder 26 reads the rotation data of the signal detection shaft 25 and outputs a corresponding pulse signal. The pulse signal is transmitted to the programmable controller through the CC-LINK communication protocol. At the same time, the rotation data of the signal detection shaft 25 is displayed on the electronic display 5 through the flexible shaft 4, and the electronic display 5 outputs the switch signal to the programmable controller.

[0044] Step 3: The programmable controller processes the data in step 2 and controls the start and stop of the hydraulic mechanism.

[0045] The programmable controller calculates the pulse signal given by the encoder 26 and displays it on the touch screen, so that the read value of the encoder 26 is consistent with the actual mold height value after conversion. This allows the entire device to be adapted to different mold heights and thereby controls the forward and reverse rotation of the hydraulic motor 2, thereby automatically controlling the up and down movement of the slider 12 to achieve precise control of the mold height.

[0046] The programmable controller receives the switch signal from the electronic display 5 and processes it. Once the movement stroke of the slider 12 reaches the set upper and lower limits, the programmable controller electric motor 20 is turned off, causing the hydraulic motor 2 to stop rotating. If the electronic display 5 fails, when the wedge block 14 moves to the upper proximity switch 7 and the lower proximity switch 16, the programmable controller receives the signals from the upper proximity switch 7 and the lower proximity switch 16, controls the electric motor 20 to turn off, and causes the hydraulic motor 2 to stop rotating.

[0047] In step 3, the programmable controller calibrates the encoder 26 value and the actual displacement value of the slider 12 as follows: the encoder 26 signal has the following: 1024 angles per revolution, 4096 revolutions, and a maximum resolution of 1024 x 4096; the position data generation time is < 1 μs; the encoder 26 real-time reading value is set to D500, and the range is determined to be 0-4194304 based on the encoder 26 selection; the current value of the slider 12 is set to D600 on the touch screen; the transmission ratio parameter is set to D601 on the touch screen, and the value of D601 is 1:0.01; the encoder 26 current value is converted to D602, D602 = D600 / D601*K, where the K value is the matching coefficient between the mold height and the encoder 26 resolution, which is 10; the encoder 26 absolute zero point value is D605, D605 = D500 - D602; the actual mold height value measured by the encoder 26 is D610, that is, D610 = (D500 - D605) / 10 * D601=[D500-(D500 - D602)] / 10*D601.

[0048] In the present invention, the mechanical movement process is as follows: the worm 3 drives the turbine 6 to rotate, which is divided into two rotations. One path rotates the adjusting screw 10, so that the screw sleeve 11 moves back and forth along the axial direction of the adjusting screw 10. The screw sleeve 11 carries the wedge block 14 and moves back and forth along the inclined copper plate 9 at the bottom of the upper seat 8. Since the upper seat 8 is fixed on the fuselage 2, the wedge block 14 moves simultaneously in the horizontal and vertical directions, and moves back and forth in the horizontal direction along the horizontal guide rail 13 at the top of the slider 12. At the same time, it also drives the slider 12 to move up and down. Since the mold is installed at the bottom of the slider 12, the up and down movement of the mold is realized.

[0049] The other way drives the main pulley 29 to rotate, and drives the rotation of the slave pulley 27 through the synchronous belt 28, thereby realizing a 1:1 transmission between the worm 3 and the signal detection shaft 25. The rotation of the signal detection shaft 25, on the one hand, displays the rotation data on the electronic display 5 through the flexible shaft 4, and on the other hand, reads it through the encoder 26 and transmits it to the programmable controller, which then processes it and displays it on the touch screen. Through the setting of the touch screen, the adjustment and precise control of different mold heights can be achieved.

[0050] Electrical Control Process: The rotation of the signal detection shaft 25 is divided into two paths. One path is connected to the electronic display 5 via a flexible shaft 4 for signal acquisition from the 0.01-digit electronic display 5, and the other path is directly connected to the encoder 26 for signal acquisition. The 0.01-digit electronic display 5 can directly display and output digital signals to the programmable controller. The pulse signal from encoder 26 is transmitted to the programmable controller via the CC-LINK communication protocol. The programmable controller calculates this signal and displays it on the touch screen. The programmable controller uses the signals (digital and numerical) detected by the dual loops for logical analysis to control the start and stop of the electric motor 20 and the forward and reverse rotation of the three-position, four-way solenoid valve 18. This controls the start and stop, forward and reverse rotation of the hydraulic motor 2, and adjusts the vertical displacement of the slide 12, thereby achieving precise adjustment and control for different mold heights.

[0051] By adjusting the number of worm gear teeth, the screw pitch, and the slope of the wedge block 14, the transmission ratio between the worm and the slider is 1:0.01. For each rotation of the worm 3, the mold height travel is 0.01 times the worm's circumference. The transmission ratios between the worm 3 and the shaft via the synchronous belt 28 are 1:1, the transmission ratios between the shaft and the encoder 26 are 1:1, and the transmission ratios between the shaft and the flexible shaft 4 are 1:1. This allows the 0.01-digit electronic display 5 to directly display and output a switching signal to the programmable controller. If the movement of the slider 12 exceeds the upper or lower limits, the programmable controller shuts down the electric motor 20 and, in turn, the hydraulic motor 2, based on the switching signal, to prevent the slider 12 from moving beyond its range. If the electronic display 5 malfunctions, and the wedge block 14 moves to the upper proximity switch 7 or the lower proximity switch 16, the programmable controller will also receive a signal from the upper proximity switch 7 or the lower proximity switch 16, shutting down the hydraulic motor 2, thus providing dual protection.

[0052] When using the device for the first time, the value of the encoder 26 needs to be calibrated with the actual value of the mold height so that the output of the encoder 26 corresponds to the mold height value.

[0053] Taking the 10-bit encoder 26 as an example for specific description, the signal of the 10-bit encoder 26 has the following characteristics: the number of angles per revolution is 1024, the number of revolutions is 4096, and the maximum resolution is 1024 x 4096.

[0054] First, define the real-time reading value of encoder 26 as D500 (the value range is 0-4194304 according to the selection of encoder 26). For example, 2107152 is the reading of encoder 26. Set the current mold height on the touch screen and define it as D600. Since the adjustment range of the mold height is 430mm-550mm, if the current mold height is 510mm, then D600=510mm. Since the transmission ratio is 1:0.01, set the transmission ratio on the touch screen to D601, D601=1:0.01.

[0055] Set the conversion value of the current value of encoder 26 to D602, D602=D600 / D601*K, which is the matching coefficient between the mold height and the resolution of encoder 26. Calculated based on the current mold height of 510mm, D602=D600 / D601*10=510 / 0.01*K. The value of D602 needs to be between 0-2097152 (2097152 is half of the maximum resolution of the 10-bit encoder). Therefore, taking K as 10 both meets the requirements and facilitates calculation, D602=51000.

[0056] Therefore, different encoders have different corresponding K values. For a 10-bit to 12-bit encoder, the K value can be 10; for a 13-bit to 15-bit encoder, the K value can be 100; for a 16-bit to 17-bit encoder, the K value can be 1000, and so on. That is, the value after mold height value * 100 * K is less than half of the maximum resolution of the encoder.

[0057] In this way, the absolute zero point value of encoder 26 is defined as D605, D605 = D500 - D602. According to the current mold height of 510mm, D605 = D500 - D602 = 2107152 - 510000 = 1597152. Then the reading of encoder 26 is converted into the actual mold height value and defined as D610, D610 = (D500 - D605) / 10 * D601=[D500-(D500 - D602)] / 10*D601, then D610 = [D500- (D500 - D602)] / 10*D601=[2107152-(2107152 -510000)] / 10*0.1=510mm.

[0058] Through such calculation, when used for the first time, the reading of the encoder 26 is calculated by the programmable controller and corresponds to the current mold height, so that when different molds are used subsequently, there is no need to adjust it. What needs to be done is to modify the mold height value to be used on the touch screen. The reading of the encoder 26 can be used to control the downward stroke of the slider 12 to make corrections, so as to match the mold of another height after replacement.

[0059] The present invention adopts a hydraulic motor 2 plus an electromagnetic valve 18 cylinder method to improve the accuracy of the die height and achieve 0.01-bit accuracy; it adopts dual-loop signal acquisition and dual-loop upper and lower limit protection to achieve redundant control, thereby improving the reliability and safety of the die height adjustment control; it designs an automatic die height adjustment mode, which can quickly and accurately position, greatly improving production efficiency and reducing costs.

[0060] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features therein according to the disclosed technical content without creative labor, and these substitutions and modifications are all within the protection scope of the present invention.

Claims

1. A precise die height control device for a press machine, characterized in that: The invention comprises a power mechanism, the power mechanism is connected to a worm, the worm is respectively connected to a mold height pushing mechanism and a two-way detection mechanism, the mold height pushing mechanism is connected to a slider, the slider is connected to the body via a vertical guide rail, the two-way detection mechanism is connected to a variable programmable controller, the programmable controller is connected to the power mechanism, and the programmable controller is connected to a touch screen; The mold height pushing mechanism includes a turbine that cooperates with the worm, the turbine sleeve is set on the adjusting screw, the adjusting screw is sleeved with a screw sleeve, the screw sleeve is embedded in the wedge block, the wedge block is set between the upper seat and the slider, the upper seat is fixed to the frame, the bottom of the upper seat is provided with an inclined copper plate, the inclined copper plate and the top inclined surface of the wedge block are matched, the top of the slider is provided with a horizontal guide rail, the bottom of the wedge block cooperates with the horizontal guide rail to connect the slider, the machine body is provided with a wedge guide rail, the wedge block is sleeved on the wedge guide rail, the wedge block is equipped with an upper proximity switch and a lower proximity switch, the upper proximity switch and the lower proximity switch correspond to the two ends of the wedge block respectively; The two-way detection mechanism includes a master pulley and a slave pulley. The master pulley is sleeved on the lower end of the worm, and the slave pulley is sleeved on the signal detection shaft. The master pulley and the slave pulley are connected by a synchronous belt. The upper end of the signal detection shaft is connected to a soft shaft, which is connected to a 0.01-bit electronic display. The lower end of the signal detection shaft is connected to an encoder. The encoder and the electronic display are both connected to a programmable controller.

2. The precise die height control device for a press machine according to claim 1, characterized in that: The transmission ratio between the worm and the slider is 1:0.01, the transmission ratio between the worm and the signal detection shaft is 1:1, the transmission ratio between the signal detection shaft and the encoder is 1:1, and the transmission ratio between the signal detection shaft and the flexible shaft is 1:

1.

3. The precise die height control device for a press machine according to claim 2, characterized in that: The power mechanism includes a fuel tank, which is connected to an oil outlet pipe, which is connected to an electric motor arranged on the fuel tank, and a check valve and a pressure gauge are provided on the oil outlet pipe. The oil outlet pipe is connected to the hydraulic motor via a three-position four-way solenoid valve, and the hydraulic motor is connected to the worm gear. The hydraulic motor is also connected to the return oil pipe, and the return oil pipe is connected to the fuel tank via a three-position four-way solenoid valve. A pressure relief pipe is connected to the oil outlet pipe between the check valve and the electric motor, and a built-in pressure relief valve is provided on the pressure relief pipe.

4. A method for accurately controlling the die height of a press, characterized in that: A precise die height control device for a press machine according to any one of claims 1 to 3 is provided, wherein the specific contents are as follows: Step 1: The hydraulic motor drives the worm to rotate, and the rotation of the worm drives the slider to move up and down through the mold height pushing mechanism; Step 2: The rotation data of the worm is sent to the programmable controller through two detection mechanisms; Step 3: The programmable controller processes the data in step 2 and controls the start and stop of the hydraulic mechanism; The specific contents of step 1 are as follows: The hydraulic motor drives the worm to rotate, and the worm drives the adjusting screw to rotate through the worm gear, thereby causing the screw sleeve to move forward and backward along the axial direction of the adjusting screw. The wedge block moves forward and backward along the axial direction of the adjusting screw under the drive of the screw sleeve. In this way, when the wedge block moves forward along the inclined copper plate at the bottom of the upper seat, it will also move downward along the inclined copper plate at the same time, that is, the wedge block will move forward along the wedge guide rail, so that the wedge block will move forward along the horizontal guide rail at the top of the slider at the same time, and at the same time, it will press the slider to move downward along the vertical guide rail on the machine body, thereby driving the mold to move downward; in this way, when the wedge block moves backward along the inclined copper plate at the bottom of the upper seat, it will also move upward along the inclined copper plate at the same time, that is, the wedge block will move backward along the wedge guide rail, so that the wedge block will move backward along the horizontal guide rail at the top of the slider at the same time, and at the same time, it will carry the slider upward along the vertical guide rail on the machine body through the horizontal guide rail, thereby driving the mold to move upward; The specific content of step 2 is as follows: The encoder reads the signal detection shaft rotation data and outputs the corresponding pulse signal, which is transmitted to the programmable controller through the CC-LINK communication protocol; At the same time, the rotation data of the signal detection shaft is displayed on the electronic display through the flexible shaft, and the electronic display outputs the switch signal to the programmable controller.

5. The method for controlling the precise die height of a press machine according to claim 4, characterized in that: The programmable controller calculates the pulse signal given by the encoder and displays it on the touch screen, so that the encoder reading value is consistent with the actual mold height value after conversion. This allows the entire device to be adapted to different mold heights and thereby controls the forward and reverse rotation of the hydraulic motor, thereby automatically controlling the up and down movement of the slider to achieve precise control of the mold height. The programmable controller receives the switch signal of the electronic display and processes it. Once the movement of the slider reaches the set upper and lower limits, the programmable controller's electric motor is turned off, causing the hydraulic motor to stop rotating. If the electronic display fails, when the wedge block moves to the upper proximity switch and the lower proximity switch, the programmable controller receives the signal from the upper and lower proximity switches, controls the electric motor to turn off, and causes the hydraulic motor to stop rotating.

6. The method for controlling the precise die height of a press machine according to claim 5, characterized in that: In step 3, the programmable controller calibrates the encoder value and the actual displacement value of the slider as follows: Set the encoder's real-time reading to D500 and the current slider value on the touch screen to D600. Set the transmission ratio parameter on the touch screen to D601, with a value of 1:0.

01. Convert the encoder's current value to D602: D602 = D600 / D601*K, where K is the matching coefficient between the mold height and the encoder's resolution. The encoder's absolute zero point is D605: D605 = D500 - D602. The actual mold height measured by the encoder is D610: D610 = (D500 - D605) / K * D601 = [D500 - (D500 - D602)] / K * D601.

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