A rocker arm device and control method for a vertical double-end surface grinding machine

Abstract

The present invention relates to a rocker arm device and control method for a vertical double-end surface grinding machine, comprising a bed, a connecting flange, a driving flange, a swing arm, a cantilever and a turntable bearing, and also comprising: a fixed flange, a sensor, a frequency converter, a PLC controller, a rocker arm assembly, a positioning assembly and a driving motor, wherein the fixed flange is passed through the bed on one side of the turntable seat and is fixedly connected to the bed by bolts, a position sensor is arranged on the upper end surface of the fixed flange, the driving motor drives the inner ring of the turntable bearing to rotate through the rocker arm assembly driving flange, and the positioning assembly positions the driving flange through a positioning pin. The present invention adopts a frequency converter controlled by a PLC to control the speed and torque of the motor, and the speed of the motor changes according to the change of the rotation position of the swing arm. During grinding, the frequency converter control mode is changed to a torque mode, so that the motor is in a stalled state, and a certain torque is maintained on the swing arm, so as to ensure that the swing arm is in a stable and non-vibrating state during processing, and further ensure the processing accuracy of the whole machine.

Description

Technical Field

[0001] The invention relates to end surface grinding equipment, in particular to a rocker arm device of a vertical double end surface grinding machine and a control method thereof. Background Art

[0002] The vertical double-end surface grinder can grind the parallel front and back sides of the parts at the same time. In order to complete the double-end surface grinding operation, the upper grinding disc and the lower grinding disc of the vertical double-end surface grinder need to be pressed together with the front and back ends of the product to be ground. After the grinding is completed, the upper grinding disc needs to be separated from the ground product, and enough space needs to be left between the upper grinding disc and the lower grinding disc for unloading. After unloading is completed, enough space still needs to be left between the upper grinding disc and the lower grinding disc for loading.

[0003] In the prior art, the lower grinding disc is fixedly arranged, and the upper grinding disc is driven to rise and fall by a cylinder, thereby changing the distance between the upper grinding disc and the lower grinding disc. Specifically, the cylinder is arranged vertically downward, the cylinder body of the cylinder is fixed on a frame, and the piston rod of the cylinder is connected to the upper grinding disc, so that the cylinder can drive the upper grinding disc to rise and fall. During processing, the piston rod of the cylinder extends to make the upper grinding disc descend, so that the upper grinding disc and the lower grinding disc are pressed together with the positive and negative end faces of the product to be ground respectively; during loading and unloading, the piston rod of the cylinder retracts to make the upper grinding disc rise, thereby leaving space between the upper grinding disc and the lower grinding disc. Since the upper grinding disc is heavy, and leaving enough space between the upper grinding disc and the lower grinding disc requires a large stroke of the upper grinding disc, the cylinder driving the upper grinding disc to rise and fall in the above-mentioned vertical double-end surface grinder requires a large power and stroke, which not only makes the cost of the vertical double-end surface grinder itself large, but also its energy consumption is high.

[0004] In the prior art, the vertical double-end surface grinder also has an upper grinding disc mechanism driven to swing by a rocker mechanism to realize the alignment and separation of the upper grinding disc mechanism and the lower grinding disc mechanism. For example, the patent discloses a double-sided grinder rocker mechanism and a double-sided grinder using the same (CN201820921260.6). The structure of the rocker mechanism is mainly composed of a rocker assembly driven by a cylinder to swing the upper grinding disc mechanism of the double-sided grinder through a cantilever to realize the alignment and separation of the upper grinding disc mechanism and the lower grinding disc mechanism. During the grinding operation, the upper grinding disc mechanism swings to the top of the lower grinding disc mechanism to complete the alignment. During loading and unloading, the upper grinding disc mechanism swings horizontally at a certain angle and separates from the lower grinding disc mechanism, so that a loading and unloading space can be formed between the upper grinding disc mechanism and the lower grinding disc mechanism, and the upper grinding disc mechanism does not need to be greatly lifted or lowered. Since the rocker assembly of the double-end surface grinder is driven by a cylinder, its control accuracy is not high, so it is not conducive to the overall closed-loop control of the machine tool, that is, it cannot be applied to high-precision machine tools that implement full closed-loop control. There are also hydraulically driven booms, which have high system costs, poor reliability, and troublesome repair and maintenance. Summary of the invention

[0005] The purpose of the present invention is to propose a vertical double-end surface grinding machine rocker arm device and control method, which adopts a PLC-controlled frequency converter to control the speed of the motor. When the motor drives the rocker arm assembly, the motor speed changes according to the change of the rotation position of the swing arm, so that the swing arm drives the upper grinding disc to swing smoothly and stably. At the same time, during the end surface grinding process, the motor also applies a certain torque to the swing arm to ensure that the swing arm is in a stable and non-vibrating state during processing.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A rocker arm device for a vertical double-end surface grinding machine comprises a bed, a connecting flange, a driving flange, a swivel arm, a cantilever arm and a turntable bearing, wherein a box-type turntable seat is fixedly arranged in the middle of one side of the upper end surface of the bed, a turntable hole is arranged on the upper end surface of the turntable seat, the outer ring of the turntable bearing is coaxially arranged outside the upper end opening of the turntable hole, the upper end surface of the inner ring is fixedly connected to the lower end of the swivel arm through the connecting flange, the lower end surface of the inner ring is fixedly connected to the driving flange, the driving flange is located inside the turntable seat, the cantilever arm is fixedly arranged on the upper part of the swivel arm, and further comprises: a fixing flange, a position sensor, a frequency converter, a PLC controller, a rocker arm assembly, a positioning assembly and a driving motor, the fixing flange is passed through A position sensor for measuring the rotation angle of the rocker arm assembly is arranged on the bed on one side of the turntable seat and is fixedly connected to the bed by bolts. The upper end surface of the fixed flange is provided with a position sensor for measuring the rotation angle of the rocker arm assembly. The output end of each position sensor is connected to the PLC controller signal. The PLC controller controls the speed of the drive motor through the frequency converter. The drive motor is arranged inside the bed. The drive motor is connected to the rocker arm assembly through a reducer. The rocker arm assembly is arranged on the upper end surface of the bed on one side of the turntable seat through the fixed flange and drives the inner ring of the turntable bearing to rotate through the drive flange. The positioning assembly is arranged on the bed on the other side of the turntable seat through the flange and the drive flange is positioned through the positioning pin;

[0008] The rocker arm assembly includes a transmission shaft, a push rod and a transmission pin. The transmission shaft is inserted into the inner hole of the fixed flange, and its lower end is connected with the output shaft of the reducer. A transmission plate is arranged on the upper end of the transmission shaft, and a pin is arranged on the transmission plate and is hinged to one end of the push rod through the pin. The other end of the push rod is hinged to the lower end surface of the driving flange through the transmission pin.

[0009] The position sensor includes first, second, third and fourth position sensors respectively arranged on the fixed flange, the first position sensor corresponds to detecting the origin position of the transmission disc, the second position sensor corresponds to detecting the origin deceleration position of the transmission disc, the third position sensor corresponds to detecting the terminal deceleration position of the transmission disc, and the fourth position sensor corresponds to detecting the terminal position of the transmission disc.

[0010] The drive motor is a torque motor, the drive motor is fixedly connected to the reducer, the reducer is fixedly connected to the lower end surface of the fixed flange, the output shaft of the drive motor is connected to the input end of the reducer, and the output end of the reducer is connected to the transmission shaft passing through the fixed flange.

[0011] The positioning assembly includes a guide rod and a positioning pin. One end of the guide rod is fixedly arranged on the upper end of the flange, and the other end is provided with a positioning groove. The positioning pin is fixedly arranged on the lower end surface of the driving flange and positions the rotation angle of the driving flange through the positioning groove on the guide rod.

[0012] The push rod includes a front push rod and a rear push rod. One end of the front push rod is hinged to the transmission pin on the lower end surface of the driving flange through a bearing, and the other end is fixedly connected to one end of the rear push rod through a bolt. The other end of the rear push rod is hinged to the pin shaft 505 on the upper end surface of the transmission plate through a bearing.

[0013] The first, second, third and fourth position sensors are all photoelectric switch sensors.

[0014] The PLC controller and the frequency converter are connected by industrial bus RS-485, and the communication protocol adopts MODBUS RTU.

[0015] The present invention also proposes a control method for the rocker arm device of the vertical double-end surface grinding machine, comprising the following steps:

[0016] Step S1, when the transmission disc is at the origin position, the workpiece is installed, and the PLC controller receives the rocker arm command. At this time, the PLC controller starts the drive motor through the frequency converter, and the drive motor rotates forward at the rated speed to drive the transmission disc to rotate;

[0017] Step S2, the PLC controller reads the signal of the third position sensor, sends a speed command to the frequency converter, reduces the speed of the drive motor through the frequency converter, and rotates the transmission disc to the end position;

[0018] Step S3, the PLC controller reads the signal of the fourth position sensor, sends a torque command to the frequency converter, and the frequency converter outputs the corresponding voltage, current, and frequency. At this time, the PLC controller reads the current value in the frequency converter, and adjusts the torque setting value of the PLC controller to make the output current value of the frequency converter 1 / 2-1 / 3 of the rated current of the drive motor, so that the drive motor is blocked;

[0019] Step S4: After the processing program is completed, the PLC controller receives the return instruction and sends a speed instruction to the frequency converter to drive the motor to reverse at the rated speed and drive the transmission disc to rotate in the opposite direction;

[0020] Step S5, the PLC controller reads the signal of the second position sensor, sends a speed command to the frequency converter, reduces the speed of the drive motor through the frequency converter, and rotates the transmission disk to the origin position;

[0021] Step S6: The PLC controller reads the signal of the first position sensor, sends a speed command to the frequency converter, and controls the drive motor to stop through the frequency converter.

[0022] The beneficial effects of the present invention are as follows: the present invention adopts a frequency converter controlled by a PLC to control the speed and torque of the motor. When the motor drives the rocker arm assembly, the motor speed changes according to the change of the rotation position of the swing arm, so that the swing arm drives the upper grinding disc to swing smoothly and stably. During the end face grinding process, the PLC changes the frequency converter control mode to the torque mode, so that the motor is in a tolerable stalled state and maintains a certain torque on the swing arm, thereby ensuring that the swing arm is in a stable and non-vibrating state during processing, further ensuring the processing accuracy of the whole machine, having the characteristics of stable operation and easy maintenance, and can be applied to a high-precision vertical double-end face grinding machine that implements full closed-loop control. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 This is a schematic diagram of the structure after removing the bed, swivel arm and cantilever.

[0025] Figure 3 for Figure 2 Top view of the .

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure after removing the bed, rotating arm and cantilever.

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the transmission shaft.

[0028] Figure 6 A top view of a vertical double-end grinding machine.

[0029] In the figure, 1, bed, 2, connecting flange, 3, driving flange, 4, swing arm, 5, rocker arm assembly, 6, cantilever, 7, turntable bearing, 9, positioning assembly, 10, fixing flange, 11, driving motor, 12, inverter, 13, reducer, 14, flange;

[0030] 101. turntable seat, 501. transmission shaft, 502. push rod, 503. transmission pin, 504. transmission plate, 505. pin shaft, 521. front push rod, 522. rear push rod, 701. outer ring, 702. inner ring, 801. first position sensor, 802. second position sensor, 803. third position sensor, 804. fourth position sensor, 901. guide rod, 902. positioning pin. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a rocker arm device of a vertical double-end surface grinding machine includes a bed 1, a connecting flange 2, a driving flange 3, a rotating arm 4, a cantilever 6 and a turntable bearing 7. A box-type turntable seat 101 is fixedly arranged in the middle of one side of the upper end surface of the bed 1. The upper end surface of the turntable seat 101 is provided with a turntable hole. The outer ring 701 of the turntable bearing is coaxially arranged outside the upper end opening of the turntable hole. The upper end surface of the inner ring 702 is fixedly connected to the lower end of the rotating arm 4 through the connecting flange 2. The lower end surface of the inner ring 702 is fixedly connected to the driving flange 3. The driving flange 3 is located inside the turntable seat 101. The cantilever 6 is fixedly arranged on the upper part of the rotating arm 4. It also includes: a fixed flange 10, a position sensor, a frequency converter 12, a PLC controller, a rocker arm assembly 5, a positioning assembly 9 and a driving motor 11. The fixed flange 10 is penetrated The upper end surface of the bed 1 is arranged on one side of the turntable seat 101 and is fixedly connected to the bed 1 by bolts. The upper end surface of the fixed flange 10 is provided with a position sensor for measuring the rotation angle of the rocker arm assembly 5. The output end of each position sensor is connected to the PLC controller signal. The PLC controller controls the speed of the drive motor 11 through the frequency converter 12. The drive motor 11 is arranged inside the bed 1. The drive motor 11 is connected to the rocker arm assembly 5 through the reducer 13. The rocker arm assembly 5 is arranged on the bed 1 on one side of the turntable seat 101 through the fixed flange 10 and drives the inner ring 702 of the turntable bearing to rotate through the drive flange 3. The positioning assembly 9 is arranged on the bed on the other side of the turntable seat 101 through the flange 14 and positions the drive flange 3 through the positioning pin 902;

[0033] The rocker arm assembly 5 includes a transmission shaft 501, a push rod 502 and a transmission pin 503. The transmission shaft 501 is inserted into the inner hole of the fixed flange 10, and its lower end is connected with the output shaft of the reducer 13. Figure 3 , Figure 5 As shown, a transmission plate 504 is provided at the upper end of the transmission shaft 501, a pin 505 is provided on the transmission plate 504 and is hinged to one end of the push rod 502 through the pin 505, and the other end of the push rod 502 is hinged to the lower end surface of the driving flange 3 through the transmission pin 503;

[0034] like Figure 4As shown, the position sensor includes a first position sensor 801, a second position sensor 802, a third position sensor 803, and a fourth position sensor 804 respectively arranged on the fixed flange 10, the first position sensor 801 corresponds to detecting the origin position of the transmission disk 504, the second position sensor 802 corresponds to detecting the origin deceleration position of the transmission disk 504, the third position sensor 803 corresponds to detecting the terminal deceleration position of the transmission disk 504, and the fourth position sensor 804 corresponds to detecting the terminal position of the transmission disk 504.

[0035] The drive motor 11 is a torque motor, which is fixedly connected to the reducer 13, and the reducer 13 is fixedly connected to the lower end surface of the fixed flange 10. The output shaft of the drive motor 11 is connected to the input end of the reducer 13, and the output end of the reducer 13 is connected to the transmission shaft 501 passing through the fixed flange 10.

[0036] The positioning assembly 9 includes a guide rod 901 and a positioning pin 902. One end of the guide rod 901 is fixedly arranged on the upper end of the flange 14, and the other end is provided with a positioning groove. The positioning pin 902 is fixedly arranged on the lower end surface of the driving flange 3 and positions the rotation angle of the driving flange 3 through the positioning groove on the guide rod 901.

[0037] like Figure 2 , Figure 3 , Figure 4 As shown, the push rod 502 includes a front push rod 521 and a rear push rod 522. One end of the front push rod 521 is hinged to the transmission pin 503 on the lower end surface of the driving flange 3 through a bearing, and the other end is fixedly connected to one end of the rear push rod 522 through a bolt. The other end of the rear push rod 522 is hinged to the pin shaft 505 on the upper end surface of the transmission plate 504 through a bearing.

[0038] The first position sensor 801 , the second position sensor 802 , the third position sensor 803 , and the fourth position sensor 804 are all photoelectric switch sensors.

[0039] The PLC controller and the frequency converter 12 are connected by industrial bus RS-485, and the communication protocol adopts MODBUSRTU.

[0040] In the above specific implementation, the selected position sensor is an Autonics sensor, whose model is BS5-T2M; the selected frequency converter is a Delta frequency converter, whose model is VDF015C43A. The frequency converter has multiple control modes. The present invention switches between two of the control modes (speed mode and torque mode) through a PLC controller; the motor adopts a torque motor, which has a strong overload capacity and can withstand a certain period of stalling.

[0041] The present invention also proposes a control method for the rocker arm device of the vertical double-end surface grinding machine, comprising the following steps:

[0042] Step S1, when the transmission disc is at the origin position, the workpiece is installed, and the PLC controller receives the rocker arm command. At this time, the PLC controller starts the drive motor through the frequency converter, and the drive motor rotates forward at the rated speed to drive the transmission disc to rotate;

[0043] Step S2, the PLC controller reads the signal of the third position sensor, sends a speed command to the frequency converter, reduces the speed of the drive motor through the frequency converter, and rotates the transmission disc to the end position;

[0044] Step S3, the PLC controller reads the signal of the fourth position sensor, sends a torque command to the frequency converter, and the frequency converter outputs the corresponding voltage, current, and frequency. At this time, the PLC controller reads the current value in the frequency converter, and adjusts the torque setting value of the PLC controller to make the output current value of the frequency converter 1 / 2-1 / 3 of the rated current of the drive motor, so that the drive motor is blocked;

[0045] Step S4: After the processing program is completed, the PLC controller receives the return instruction and sends a speed instruction to the frequency converter to drive the motor to reverse at the rated speed and drive the transmission disc to rotate in the opposite direction;

[0046] Step S5, the PLC controller reads the signal of the second position sensor, sends a speed command to the frequency converter, reduces the speed of the drive motor through the frequency converter, and rotates the transmission disk to the origin position;

[0047] Step S6: The PLC controller reads the signal of the first position sensor, sends a speed command to the frequency converter, and controls the drive motor to stop through the frequency converter.

[0048] The principle and arm rotation process of the present invention are as follows:

[0049] 1. Principle: PLC is used to control the frequency converter to control the speed of the swing of the rotating arm. When the machine tool is performing end face grinding, the frequency converter control mode is changed to make the motor enter a stable stalled state. The motor will not fail due to overheating. At the same time, it also ensures the stable rotation of the upper plate during grinding and reduces the accuracy error caused by vibration.

[0050] 2. Arm turning process: When the machine is started and initialized, the arm 4 is located at the origin (at this time, the upper plate and the lower plate are offset by the set maximum angle, i.e., zero position). After the workpiece is installed, the run key is pressed, and the PLC controller issues a command, the drive motor 11 is started, and the drive motor 11 drives the transmission plate 504 to rotate at a set speed. The transmission plate 504 drives the arm 4 to swing through the push rod 502, and the arm 4 drives the upper plate to swing through the cantilever 6;

[0051] When the rotating arm 4 is about to reach the end position, the third position sensor 803 detects the end deceleration position of the transmission plate 504, and transmits the signal to the PLC controller. The PLC controller controls the drive motor 11 to decelerate through the inverter 12, and the rotating arm 4 slowly reaches the end position. At this time, the positioning component completes the positioning of the rotating arm;

[0052] like Figure 6 As shown, after reaching the end position, the fourth position sensor 804 transmits a signal to the PLC controller, and the PLC controller further reduces the speed of the drive motor through the frequency converter until the speed is zero. At this time, the PLC controller changes the control mode of the frequency converter from the speed control mode to the torque control mode. The torque size can be set according to the power of the machine tool, so that the drive motor 11 is blocked, and a certain torque is applied to the swing arm 4 to ensure that the swing arm does not rotate in the opposite direction. At this time, the upper disk spindle starts and moves downward, pressing the upper end face of the workpiece to rotate, and the lower disk rotates in the opposite direction at the same time to grind the upper and lower end faces of the workpiece. During this process, the frequency converter 12 controls the drive motor 11 to always be in a blocked state to keep the upper disk stable and motionless at the end point, eliminating the precision error caused by the disturbance vibration of the grinding process;

[0053] After the workpiece is processed according to the set program, the upper and lower plates stop rotating, the upper plate rises, and the PLC controller issues a command, and the frequency converter 12 is changed to the speed mode again, and the frequency converter 12 controls the drive motor 11 to reverse, driving the rotating arm 4 to return. When the rotating arm 4 is about to reach the origin position, the second position sensor 802 detects the origin deceleration position of the transmission plate 504, and the PLC controller controls the drive motor 11 to decelerate through the frequency converter 12, and the rotating arm 4 slowly reaches the origin position;

[0054] After reaching the origin position, the first position sensor 801 transmits a signal to the PLC controller, and the drive motor 11 stops rotating. At this time, the workpiece can be unloaded and wait for the next round of processing to start.

[0055] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention.

[0056] Parts of the present invention not described in detail are prior art.

Claims

1. A control method for a rocker arm device of a vertical double-end surface grinding machine, the rocker arm device of the vertical double-end surface grinding machine comprising a bed (1), a connecting flange (2), a driving flange (3), a rotating arm (4), a cantilever (6) and a turntable bearing (7), a box-type turntable seat (101) is fixedly arranged in the middle of one side of the upper end surface of the bed (1), a turntable hole is arranged on the upper end surface of the turntable seat (101), the outer ring (701) of the turntable bearing is coaxially arranged outside the upper end opening of the turntable hole, the upper end surface of the inner ring (702) is fixedly connected to the lower end of the rotating arm (4) through the connecting flange (2), the lower end surface of the inner ring (702) is fixedly connected to the driving flange (3), the driving flange (3) is located inside the turntable seat (101), and the cantilever (6) is fixedly arranged on the upper part of the rotating arm (4), wherein: The rocker arm device of the vertical double-end surface grinding machine further comprises: a fixed flange (10), a position sensor, a frequency converter (12), a PLC controller, a rocker arm assembly (5), a positioning assembly (9) and a drive motor (11), wherein the fixed flange (10) is passed through the upper end surface of the bed (1) on one side of the turntable seat (101) and is fixedly connected to the bed (1) by bolts, and the upper end surface of the fixed flange (10) is provided with a position sensor for measuring the rotation angle of the rocker arm assembly (5), and the output end of each position sensor is connected to the PLC controller signal, and the PLC controller The speed of the drive motor (11) is controlled by a frequency converter (12); the drive motor (11) is arranged inside the bed (1); the drive motor (11) is connected to the rocker arm assembly (5) via a reducer (13); the rocker arm assembly (5) is arranged on the bed (1) on one side of the turntable seat (101) via a fixing flange (10) and drives the inner ring (702) of the turntable bearing to rotate via a driving flange (3); the positioning assembly (9) is arranged on the bed on the other side of the turntable seat (101) via a flange (14) and positions the driving flange (3) via a positioning pin (902); The rocker arm assembly (5) comprises a transmission shaft (501), a push rod (502) and a transmission pin (503); the transmission shaft (501) is inserted into the inner hole of the fixed flange (10); the lower end of the transmission shaft (501) is connected to the output shaft of the reducer (13); a transmission disc (504) is arranged at the upper end of the transmission shaft (501); a pin shaft (505) is arranged on the transmission disc (504) and is hinged to one end of the push rod (502) through the pin shaft (505); the other end of the push rod (502) is hinged to the lower end surface of the driving flange (3) through the transmission pin (503); The position sensors comprise a first position sensor (801), a second position sensor (802), a third position sensor (803), and a fourth position sensor (804) which are respectively arranged on the fixed flange (10); the first position sensor (801) corresponds to detecting the origin position of the transmission disc (504); the second position sensor (802) corresponds to detecting the origin deceleration position of the transmission disc (504); the third position sensor (803) corresponds to detecting the terminal deceleration position of the transmission disc (504); and the fourth position sensor (804) corresponds to detecting the terminal position of the transmission disc (504); The drive motor (11) is a torque motor. The drive motor (11) is fixedly connected to the reducer (13). The reducer (13) is fixedly connected to the lower end surface of the fixed flange (10). The output shaft of the drive motor (11) is connected to the input end of the reducer (13). The output end of the reducer (13) is connected to a transmission shaft (501) passing through the fixed flange (10). The control method of the rocker arm device of the vertical double-end surface grinding machine comprises the following steps: Step S1, when the transmission disk (504) is located at the origin position, the workpiece is installed, and the PLC controller receives a rocker arm command. At this time, the PLC controller starts the drive motor (11) through the frequency converter (12), and the drive motor (11) rotates forward at the rated speed, driving the transmission disk (504) to rotate; Step S2, the PLC controller reads the signal of the third position sensor (803), sends a speed command to the frequency converter (12), reduces the speed of the drive motor (11) through the frequency converter (12), and causes the transmission plate (504) to rotate to the end position; Step S3, the PLC controller reads the signal of the fourth position sensor (804), issues a torque command to the frequency converter (12), and the frequency converter (12) outputs corresponding voltage, current, and frequency. At this time, the PLC controller reads the current value in the frequency converter (12), adjusts the torque setting value of the PLC controller, and makes the output current value of the frequency converter (12) be between 1 / 2 and 1 / 3 of the rated current of the drive motor (11), so that the drive motor (11) is blocked; Step S4: After the processing program is completed, the PLC controller receives a return instruction and sends a speed instruction to the frequency converter (12), driving the motor (11) to reverse at a rated speed, driving the transmission disc (504) to rotate in the opposite direction; Step S5, the PLC controller reads the signal of the second position sensor (802), sends a speed command to the frequency converter (12), reduces the speed of the drive motor (11) through the frequency converter (12), and causes the transmission plate (504) to rotate to the origin position; Step S6: The PLC controller reads the signal of the first position sensor (801), sends a speed command to the frequency converter (12), and controls the drive motor (11) to stop rotating through the frequency converter (12).

2. The control method of a rocker arm device of a vertical double-end surface grinding machine according to claim 1 is characterized in that: The positioning assembly (9) comprises a guide rod (901) and a positioning pin (902); one end of the guide rod (901) is fixedly arranged on the upper end of the flange (14), and the other end is provided with a positioning groove; the positioning pin (902) is fixedly arranged on the lower end surface of the driving flange (3) and positions the rotation angle of the driving flange (3) through the positioning groove on the guide rod (901).

3. The control method of a rocker arm device of a vertical double-end surface grinding machine according to claim 1 is characterized in that: The push rod (502) comprises a front push rod (521) and a rear push rod (522); one end of the front push rod (521) is hinged to a transmission pin (503) on the lower end surface of the driving flange (3) via a bearing, and the other end is fixedly connected to one end of the rear push rod (522) via a bolt; the other end of the rear push rod (522) is hinged to a pin shaft (505) on the upper end surface of the transmission plate (504) via a bearing.

4. The control method of a rocker arm device of a vertical double-end surface grinding machine according to claim 1 is characterized in that: The first position sensor (801), the second position sensor (802), the third position sensor (803), and the fourth position sensor (804) are all photoelectric switch sensors.

5. The control method of a rocker arm device of a vertical double-end surface grinding machine according to claim 1 is characterized by: The PLC controller and the frequency converter (12) are connected using the industrial bus RS-485, and the communication protocol uses MODBUS RTU.

Images