Control system of large stone cutting machine and control method thereof
By setting the slice positions on the left and right sides of the large stone cutting machine, the problem of waste of power and low production efficiency when cutting thick stone is solved, and the cutting knife can directly lift the knife to 0-position slices on any side. , improves cutting efficiency.
Patent Information
- Application Number
- CN202411589082.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2024-12-27
AI Technical Summary
When cutting thick stones with existing large stone cutters, the cutting knife needs to cut a piece of stone slab multiple times, and the last knife does not necessarily end at the fragmented position, resulting in waste of electricity and low production efficiency.
Set the slice positions on the left and right sides of the large stone cutting machine respectively. According to the cutting direction and depth of the cutting knife, raise the knife to 0 position at the left or right fragment position to avoid the cutter running away from the empty knife.
Save power, improve production efficiency, and ensure that the last knife of each stone slab can be directly raised to 0 in the shard position for sharding.
Smart Images
Figure CN119189088A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of stone cutting, and in particular to a control system and a control method of a large stone cutting machine. Background Art
[0002] The stone cutting machine is a common stone slicing mechanism, and its structure generally includes two cross bridges, a cross beam connecting the two cross bridges, and a guide column arranged on the cross beam, on which a stone cutting mechanism is arranged. The cross beam can move forward and backward (Y axis) along the cross bridge, the guide column can move left and right (X axis) along the cross beam, and the stone cutting mechanism can move up and down (Z axis) along the guide column, so that the stone cutting mechanism can move forward and backward, left and right, and up and down, and the stone can be cut by the cutting knife on the stone cutting mechanism.
[0003] The control system of the existing large stone cutting machine generally includes a main circuit, a secondary circuit and a PLC control circuit. The main circuit is connected to the secondary circuit, and the secondary circuit is connected to the PLC control circuit. The main circuit includes a power supply circuit, and a main power switch, an ammeter and a motor drive device arranged on the power supply circuit. The motor drive device includes a main cutting motor circuit, a servo motor circuit and an oil pump motor circuit. The PLC control circuit includes a human-machine interface, an input circuit, a PLC controller and an output circuit.
[0004] According to the existing control method of the stone cutting machine, there is only one slicing position, which is generally set on the left or right side of the machine. In this way, each time a piece of stone is cut, the cutter must return to the only slicing position to raise the knife to position 0 (located above the stone, with a set distance from the top surface of the stone) for slicing. However, because the stone is hard, especially when cutting thicker stones, it takes multiple cuts to complete each slicing, and the hardness of different parts of the same stone is not completely consistent, so not the last cut of each slicing is completed on this side of the slicing position. When the last cut is not completed on this side of the slicing position, the knife needs to run back to this side of the slicing position to raise the knife to position 0 for slicing, which will waste a lot of electricity and have low production efficiency. Summary of the invention
[0005] The object of the present invention is to provide a control system and a control method for a stone cutting machine which can save electricity and has high production efficiency.
[0006] In order to achieve the above object, the present invention adopts the following technical solution: A control method for a large stone cutting machine comprises: firstly placing a stone to be cut on a workbench of the large stone cutting machine, then setting a left slicing position outside the left side of the stone to be cut, and setting a right slicing position outside the right side of the stone to be cut; When the cutting knife of the stone cutting machine cuts the stone to be cut from left to right and reaches the right slicing position, if the cutting knife has cut to the set depth, the cutting knife is raised from the right slicing position to position 0 for slicing; When the cutting knife of the stone cutting machine cuts the stone to be cut from right to left and reaches the left slicing position, if the cutting knife has cut to a set depth, the cutting knife is raised from the left slicing position to position 0 for slicing.
[0007] Furthermore, for each piece of stone to be cut, a left soft limit position and a right soft limit position of the cutting knife are set, the left soft limit position is the left slicing position, and the right soft limit position is the right slicing position.
[0008] Furthermore, the left slicing position is 10-20 centimeters away from the left side of the stone to be cut.
[0009] Furthermore, the right slicing position is 10-20 centimeters away from the right side of the stone to be cut.
[0010] A control system for a large stone cutting machine, wherein the control method of the control system adopts the control method as described above.
[0011] After adopting the above scheme, a control system and control method of a large stone cutting machine of the present invention are respectively provided with slicing positions on the left and right sides of the stone to be cut. In this way, when the last cut of each stone slab is finished, no matter whether the cutting knife stops on the left or right side of the stone to be cut, the knife can be directly raised from the slicing position on the left or right side to position 0 for slicing without running the knife idle, thereby saving electricity and having higher production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 The flowchart of the control system of the stone cutting machine of the present invention; Figure 2 The circuit diagram of the main circuit of the control system of the stone cutting machine of the present invention; Figure 3 The circuit schematic diagram of the secondary circuit of the control system of the stone cutting machine of the present invention; Figure 4 The present invention is a circuit diagram of a PLC control circuit of the control system of the stone cutting machine. DETAILED DESCRIPTION
[0013] The present invention provides a control method for a stone cutting machine. The method comprises the following steps: firstly placing a stone to be cut on a workbench of the stone cutting machine, and then setting a left slicing position outside the left side of the stone to be cut, and setting a right slicing position outside the right side of the stone to be cut; when a cutting knife of the stone cutting machine cuts the stone to be cut from left to right and reaches the right slicing position, if the cutting knife has cut to a set depth, the cutting knife is raised from the right slicing position to position 0 for slicing; when a cutting knife of the stone cutting machine cuts the stone to be cut from right to left and reaches the left slicing position, if the cutting knife has cut to a set depth, the cutting knife is raised from the left slicing position to position 0 for slicing.
[0014] Furthermore, for each piece of stone to be cut, a left soft limit position and a right soft limit position of the cutting knife are set, the left soft limit position is the left slicing position, and the right soft limit position is the right slicing position.
[0015] Furthermore, the left slicing position is 10-20 centimeters away from the left side of the stone to be cut.
[0016] Furthermore, the right slicing position is 10-20 centimeters away from the right side of the stone to be cut.
[0017] The control system of the stone cutting machine of the present invention is as follows: Figure 2-4 As shown, it includes a main circuit, a secondary circuit and a PLC control circuit, the main circuit is connected to the secondary circuit, and the secondary circuit is connected to the PLC control circuit.
[0018] like Figure 2As shown, the main circuit includes a power supply line and a motor drive device arranged on the power supply line. The power supply circuit adopts a three-phase three-wire power supply mode, a main power switch QF is arranged at the input end of the power supply line, an ammeter PA is connected in series on the L3 phase line of the three-phase line, and a voltmeter PV1 is also connected to the power supply line through a power switch QF2. The motor drive device includes a main cutting motor circuit, a servo motor circuit and an oil pump motor circuit. The main cutting motor circuit includes a thermal relay FR2, a normally open contact of a contactor KM5, a normally open contact of a contactor KM6, a normally open contact of a contactor KM7 and a main cutting motor M4; one end of the normally open contact of the contactor KM5 and the normally open contact of the contactor KM6 are respectively connected to the power supply line through the thermal relay FR2, the other end of the normally open contact of the contactor KM5 is connected to the first input end of the main cutting motor M4, the other end of the normally open contact of the contactor KM6 is connected to the second input end of the main cutting motor M4, one end of the normally open contact of the contactor KM7 is connected to a star-connected short-circuit plate, and the other end of the normally open contact of the contactor KM7 is connected to the second input end of the main cutting motor M4. The contactors KM5-KM7 form a star-delta conversion contactor group to prevent the starting current of the main cutting motor M4 from being too large. The servo motor circuit includes a frequency converter INV1, a tool feed motor M1 and a cross-bridge motor M2. The power supply end of the frequency converter INV1 is connected to the power supply line through the normally open contact of the contactor KM1 and the power switch QF1. The output end of the frequency converter INV1 is connected to the tool feed motor M1 and the cross-bridge motor M2 respectively through the normally open contact of the contactor KM2 and the normally open contact of the contactor KM3; the oil pump motor circuit includes the normally open contact of the contactor KM4, the thermal relay FR1 and the oil pump motor M3. The oil pump motor M4 is connected to the power supply line through the thermal relay FR1, the normally open contact of the contactor KM4 and the power switch QF1.
[0019] like Figure 3 As shown, the secondary circuit includes a transformer T1, a control circuit of contactors KM1-KM7, a switching power supply U1, and a control circuit of solenoid valves YV2-YV4. The transformer T1 converts 380V AC into 220V AC to power the secondary circuit and the PLC control circuit. The control circuit of contactor KM1 is arranged on the primary side of transformer T1, and the control circuit of contactors KM2-KM7 is arranged on the secondary side of transformer T1. The switching power supply U1 converts the input 220V AC into 24V DC to power the control circuit of solenoid valves YV2-YV4.
[0020] like Figure 4As shown, the PLC control circuit includes a human-machine interface, an input circuit, a PLC controller (CPU ST40) and an output circuit. The human-machine interface is connected to the PLC controller, the input circuit is connected to the input end of the PLC controller, and the output end of the PLC controller is connected to the output circuit.
[0021] The input circuit includes a button switch and a detection signal; the button switch includes a host stop button SB1, an automatic stop button SB2, a knife rise button SB3, a knife lower button SB4, a knife advance button SB5, a knife retract button SB6, a cross bridge advance button SB7, a cross bridge retract button SB8, an automatic start button SB9 and a host start button SB10; the detection signal includes a lifting and lowering coding A phase signal, a lifting and lowering coding B phase signal, a cross bridge coding A phase signal, a cross bridge coding B phase signal, a host detection signal, a slice coding A phase signal, a slice coding B phase signal, a cross bridge advance limit signal, a cross bridge retreat limit signal, a variable frequency oil pump abnormal signal, a knife advance limit signal, a knife retreat limit signal, a knife upper limit signal and a knife lower limit signal. The lifting and lowering coding A phase signal (X0) and the lifting and lowering coding B phase signal (X1) are respectively from the Z-axis position encoder installed on the cutting knife, the cross-bridge coding A phase signal (X2) and the cross-bridge coding B phase signal (X3) are respectively from the Y-axis position encoder installed on the cutting knife, the slice coding A phase signal (X6) and the slice coding B phase signal (X7) are respectively from the X-axis position encoder installed on the cutting knife, and the Z-axis position encoder, the Y-axis position encoder and the X-axis position encoder are used to obtain the real-time position of the cutting knife; the host detection signal is connected to the X5 input terminal of the PLC controller through the normally open contact of the contactor KM5, the cross-bridge advance limit signal and the cross-bridge retreat limit signal are respectively connected to the X10 and X11 input terminals of the PLC controller through the travel switches SL1 and SL2, and the frequency conversion oil pump abnormality signal is connected to the X13 input terminal of the PLC controller through the normally open contact of the relay K1 (installed in the frequency converter, energized when the oil pump is abnormal). The knife advance limit signal and knife retreat limit signal are connected to the X23 and X24 input terminals of the PLC controller through the travel switches SL3 and SL4 respectively, and the knife upper limit signal and knife lower limit signal are connected to the X26 and X27 input terminals of the PLC controller through the travel switches SL5 and SL6 respectively. The limit position of the cutting knife is limited by each travel switch to protect the cutting knife.
[0022] The output circuit includes control output terminals Y1-Y5 for providing control signals to the frequency converter INV1, intermediate relay control output terminals (Y10-Y13, and Y15-Y17), and abnormal warning indicator control terminal Y14. Control output terminal Y1 is a forward right-moving control output terminal, control output terminal Y2 is a backward left-moving control output terminal, control output terminal Y3 is a high-speed tool-feeding control output terminal, control output terminal Y4 is a medium-speed slice control output terminal, and control output terminal Y5 is a low-speed frequency converter control output terminal. The knife rising control output terminal Y10 is connected to the coil of the intermediate relay KA1, the knife lowering control output terminal Y11 is connected to the coil of the intermediate relay KA2, the host operation control output terminal Y12 is connected to the coil of the intermediate relay KA3, the host start switching control output terminal Y13 is connected to the coil of the intermediate relay KA4, the abnormal warning indicator light control terminal Y14 is connected to the indicator light HL1, the cutting knife / cross bridge switching control output terminal Y15 is connected to the coil of the intermediate relay KA5, the oil pump operation control output terminal Y16 is connected to the coil of the intermediate relay KA6, and the knife slow lowering valve control output terminal Y17 is connected to the coil of the intermediate relay KA7.
[0023] The control system of the stone cutting machine of the present invention, its control method and working process are as follows Figure 1 As shown below, combined Figure 2-4 To explain in detail the control method and working principle of the control system.
[0024] When the stone to be cut has been placed on the workbench of the stone cutting machine, press the main power switch QF, power switch QF1 and power switch QF2 to start power-on self-check. If there is no alarm, press the emergency stop switch SB12, contactors KM1 and KM2 are energized, the normally open contacts of contactors KM1 and KM2 are closed, the inverter INV1 is powered on, the transformer T1 is turned on and starts working, outputs 220V AC power, and outputs 24V DC power through the switch power supply U1, and then sets the working parameters for the stone to be cut through the human-machine interface of the PLC control circuit (such as the thickness setting value of each piece, the preset slice value, the cutting depth setting value of each piece, the position of the left soft limit, the position of the right soft limit, etc.); After setting the working parameters, the operator starts to manually align the cutter, that is, manually operate the cutter up / down, left / right, front / back position of the cutter by pressing the cutter up / down button SB3, cutter down button SB4, cutter forward button SB5, cutter backward button SB6, cross bridge forward button SB7 and cross bridge backward button SB8 of the PLC control circuit, so that the cutter is located at the first cutter down position (located at the 0 position of the stone to be cut on the Z axis, located at or close to the left or right side of the stone to be cut on the X axis, and aligned with the cutting position of the first stone slab on the Y axis); Then press the host start button SB10. After the host starts, the host operation intermediate relay KA3 is energized, its normally open contact is closed, the contactor KM5 is energized, the normally open contact of the contactor KM5 is closed, and the main cutting motor M4 starts to run. Then press the automatic start button SB9, the PLC controller outputs the knife lowering control signal, the intermediate relay KA2 is energized, its normally open contact is closed, the knife lowering solenoid valve YV3 is energized, and the cutting knife is driven to lower the knife according to the set knife lowering value. After the knife lowering is completed, the inverter INV1 outputs the corresponding control signal to the knife feeding motor M1 according to the set working procedure. If the cutting knife is on the left side of the stone to be cut at this time, the cutting knife cuts the stone to be cut from left to right. If the cutting knife is on the right side of the stone to be cut at this time, the cutting knife cuts the stone to be cut from right to left. When the cutting knife cuts the left line of the stone to be cut into place or cuts the right line into place, it reaches the left soft limit position (left slicing position) or the right soft limit position (right slicing position). When the X-axis position encoder arranged on the cutting knife sends the slice coding A phase signal (X6) and the slice coding B phase signal (X7) to the PLC controller, the PLC controller compares them with the set working parameters. After comparison, if the position of the cutting knife has reached the set left soft limit position or right soft limit position, the PLC controller stops outputting the control signal to the control output terminal Y2 (backward left movement control output terminal) or the control output terminal Y1 (forward right movement control output terminal) accordingly, thereby stopping the X-axis movement of the cutting knife; then the Z-axis position encoder arranged on the cutting knife sends the lifting coding A phase signal (X0) and the lifting coding B phase signal (X1) to the PLC controller, the PLC controller compares them with the set working parameters. After comparison, if the position of the cutting knife has dropped to the set value (that is, the set cutting depth value has been reached), if it has dropped to the set value, the PLC controller outputs the knife rising signal to the intermediate relays KA1 and KA6, and the intermediate relays KA1 and KA6 When the cutter is powered, their normally open contacts are closed, the cutter raising solenoid valve YV2 is powered, the contactor KM4 is powered, the oil pump motor runs, and the cutter is driven to raise to position 0, and then the slicing of this piece of stone is completed; after comparison, if the position of the cutter has not dropped to the set value, it returns to the node where the cutter is lowered according to the value of each cut, and continues to lower the cutter and cut; When the current piece of stone slab is finished being sliced, the PLC controller determines whether all the cutting has been completed (that is, whether the expected slicing value has been completed) based on the set working parameters. If all the cutting has been completed, it will end automatically; if not all the cutting has been completed, a control signal will be output to the intermediate relay KA5, and the normally open contact of the intermediate relay KA5 will close and the normally closed contact will open, the contactor KM2 will lose power, the feed motor M1 will stop working, the contactor KM3 will be energized, and the cross-bridge motor M2 will start to run. According to the set working parameters (the set value of the thickness of each piece), the cutting knife is driven to move along the 0 position to the next cutting position, and then return to the automatic start node. The PLC controller will check the working parameters at this time. After the check is correct, it will enter the setting procedure to lower the knife according to the value of each knife, and repeat this cycle until the stone to be cut is cut according to the set number of cutting pieces.
[0025] After adopting the above scheme, a control system and control method of a large stone cutting machine of the present invention are respectively provided with slicing positions on the left and right sides of the stone to be cut. In this way, when the last cut of each stone slab is finished, no matter whether the cutting knife stops on the left or right side of the stone to be cut, the knife can be directly raised from the slicing position on the left or right side to position 0 for slicing without running the knife idle, thereby saving electricity and having higher production efficiency.
[0026] 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 control method for a large stone cutting machine, characterized in that: Firstly, the stone to be cut is placed on the workbench of the stone cutting machine, and then, a left-side slicing position is set outside the left side of the stone to be cut, and a right-side slicing position is set outside the right side of the stone to be cut; When the cutting knife of the stone cutting machine cuts the stone to be cut from left to right and reaches the right slicing position, if the cutting knife has cut to the set depth, the cutting knife is raised from the right slicing position to position 0 for slicing; When the cutting knife of the stone cutting machine cuts the stone to be cut from right to left and reaches the left slicing position, if the cutting knife has cut to a set depth, the cutting knife is raised from the left slicing position to position 0 for slicing.
2. The control method of a stone cutting machine according to claim 1, characterized in that: For each piece of stone to be cut, the left soft limit position and the right soft limit position of the cutting knife are set, the left soft limit position is the left slicing position, and the right soft limit position is the right slicing position.
3. The control method of a stone cutting machine according to claim 1, characterized in that: The left side slicing position is 10-20 cm away from the left side surface of the stone to be cut.
4. The control method of a stone cutting machine according to claim 1, characterized in that: The right side slicing position is 10-20 cm away from the right side surface of the stone to be cut.
5. A control system for a large stone cutting machine, characterized in that: The control method of the control system adopts the control method described in any one of claims 1 to 4.