Cutter sharpening control system

Abstract

The invention relates to a knife sharpening control system which comprises a knife sharpening mounting base, grinding wheels distributed on the two sides of a knife belt are mounted on the knife sharpening mounting base, the two grinding wheels are driven by a knife sharpening motor to rotate and driven by a propelling motor to move, and the knife sharpening motor and the propelling motor are both connected into a programmable logic controller. The control method of the sharpening control system comprises the steps that the programmable logic controller controls the sharpening motor to be started firstly, when the grinding wheel reaches the preset rotating speed, the current load value of the sharpening motor is collected, the propelling motor is controlled to move rapidly, and after the grinding wheel reaches the preset position, whether the propelling motor continues propelling or not is controlled by detecting the change of the real-time load of the sharpening motor. The sharpening control system is matched with a specific control method, the sharpening quality cannot be affected by abrasion of a knife belt and a grinding wheel, manual adjustment of a sharpening mechanism is not needed, parameters such as sharpening force and sharpening speed are digitalized, and adjustment and observation can be conducted visually.

Description

Technical Field

[0001] The invention relates to the field of knife belt sharpening, in particular to a knife belt sharpening control system used for sharpening a knife belt of a sponge cutting machine. Background Art

[0002] The sponge cutting machine is mainly used to cut sponge and other materials into two-dimensional shapes (straight lines, arcs or curves, etc.), that is, the foam material is placed on the workbench, and the sponge is cut by controlling the horizontal and vertical movement of the workbench and the reciprocating movement of the wire knife. In order to maintain the efficiency and accuracy of the knife belt grinding, the knife belt needs to be polished regularly.

[0003] At present, most existing knife sharpening mechanisms use asynchronous motors and cylinders to sharpen knives, which has some limitations. Because knife sharpening will inevitably cause wear to the knife belt and grinding wheel, when the knife belt or grinding wheel is worn to a certain extent, the knife sharpening mechanism needs to be adjusted. There are requirements for angle and strength during adjustment, which is strict for personnel. Maintenance personnel are required to be particularly careful, and the adjustment takes a long time. In addition, the strength of the knife sharpening can only rely on the experience of maintenance personnel, and there is no exact data support. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tool sharpening control system which is convenient for adjusting the grinding wheel.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a knife sharpening control system, which is used to sharpen the knife belt for sponge cutting, and its innovative points are: including A knife sharpening mounting base, on which grinding wheels distributed on both sides of a knife belt are mounted, the two grinding wheels are driven to rotate by independent knife sharpening motors, and the two grinding wheels are defined as a first grinding wheel and a second grinding wheel, respectively, the long axis direction of the knife belt in the horizontal direction is defined as a first direction, the direction horizontally perpendicular to the first direction is defined as a second direction, and the direction vertically perpendicular to the first direction is defined as a third direction, the first grinding wheel and the second grinding wheel are distributed on both sides of the knife belt along the second direction, and the first grinding wheel and the second grinding wheel are arranged obliquely, and the first grinding wheel and the second grinding wheel are driven to move along the third direction by an independent first adjustment component, or are driven to move along the second direction by an independent second adjustment component; The first adjusting component comprises a transmission base plate, a propulsion motor, an adjusting screw and a moving plate, wherein the transmission base plate is mounted on one side of the knife sharpening mounting base, the propulsion motor is mounted on the other side of the knife sharpening mounting base through a motor fixing base, one side of the adjusting screw is mounted on the transmission base plate through the cooperation of a screw support base, the other side of the adjusting screw is connected to the propulsion motor after passing through the knife sharpening mounting base, and is driven to rotate by the propulsion motor, a screw nut for use with the adjusting screw is provided on the adjusting screw, the moving plate is connected to the screw nut, an adjusting guide rail is also provided on the transmission base plate beside the adjusting screw, and a slider for use with the adjusting guide rail is installed on the moving plate, the moving plate is driven by the adjusting screw to reciprocate along the third direction, the knife sharpening motor is mounted on the moving plate, and reciprocates along the third direction with the moving plate; The structure of the second adjustment component is similar to that of the first adjustment component; A programmable logic controller, which is connected to the knife sharpening motor and the propulsion motor and is used to control the start and stop of the knife sharpening motor and the start and stop of the propulsion motor; A sharpening motor and a propulsion motor are defined respectively, wherein the sharpening motor for driving the first grinding wheel to rotate is the left sharpening motor, the sharpening motor for driving the second grinding wheel to rotate is the right sharpening motor, the propulsion motor for driving the first grinding wheel to move is the left propulsion motor, and the propulsion motor for driving the second grinding wheel to move is the right propulsion motor; The sharpening control system is: S1: First, the PLC receives the sharpening signal, and then starts the two sharpening motors and sets the speed of the sharpening motors to V 初 , the two grinding motors rotate, among which #Jog[0].JogForward and #Jog[2].JogForward are the forward start commands of the grinding motors, which are expressed as: #Jog[0].JogForward:= TRUE; #Jog[2].JogForward:= TRUE; S2: The programmable logic controller detects the speed of the grinding motor. When it detects that the speed of the grinding motor reaches the preset speed, it proceeds to the next step. #Grinding 1 axis. Actual Velocity, #Grinding 2 axis. Actual Velocity are the real-time speeds of the two grinding motors. Grinding 1 is the left grinding motor, and Grinding 1 axis is the output shaft of the left grinding motor. Grinding 2 is the right grinding motor, and Grinding 2 axis is the output shaft of the right grinding motor. When the real-time speed of the grinding motor is greater than or equal to V 初 When entering step S3, it is shown as follows: # Grind axis 1. ActualVelocity>=V 初 AND #grind axis 2.ActualVelocity>= V 初 ; S3: The programmable logic controller reads the load value of the grinding motor when the grinding wheel is unloaded and records it, where #Grinding1Axis.StatusTorqueData.ActualTorque and #Grinding2Axis.StatusTorqueData.ActualTorque are the real-time loads of the grinding motor, #Grinding1 No-load Torque and #Grinding2 No-load Torque are the no-load torque recording areas. When the no-load torque #Grinding1 No-load Torque of the left grinding motor is less than the real-time torque #Grinding1Axis.StatusTorqueData.ActualTorque, the real-time torque #Grinding1Axis.StatusTorqueData.ActualTorque is assigned to the no-load torque #Grinding1 No-load Torque. The no-load torque reading method of the right grinding motor is the same as that of the left grinding motor, as shown below: IF #Grind1No-loadTorque<#Grind1Axis.StatusTorqueData.ActualTorque THEN #Grind 1 no-load torque:= #Grind 1 axis.StatusTorqueData.ActualTorque; END_IF; IF #Grind2No-loadTorque<#Grind2Axis.StatusTorqueData.ActualTorque THEN #Grind 2 no-load torque:=#Grind 2 axis.StatusTorqueData.ActualTorque; END_IF; The grinding wheel torque reading time is 1 second. When the time is reached and there is a value in the no-load torque address, go to step S4; S4: The programmable logic controller starts the propulsion motor and drives the grinding wheel to quickly position near the knife belt according to the preset value. #Absolute[0].Position and #Absolute[1].Position are the propulsion motor parameter setting areas. #Absolute[0].Execute and #Absolute[1].Execute are the propulsion motor start trigger points. #Feed Position is the preset position area. The preset value is assigned to the corresponding area of ​​the propulsion motor and the propulsion motor is triggered to move. It manifests as: #absolute[0].Position:=#feed position; #absolute[1].Position:=#feed position; #absolute[0].Execute:=TRUE; #absolute[1].Execute:=TRUE; When the propulsion motor reaches the predetermined position, the process goes to step S5; S5: The programmable logic controller starts the sharpening motor, drives the grinding wheel to rotate, starts sharpening, slowly pushes the grinding wheel to contact the knife belt, and determines whether to continue pushing according to the real-time load of the sharpening motor. #Sharpening thrust is the preset sharpening force value, #Propulsion span is the preset push displacement of the push motor once, when the real-time load of the left sharpening motor is less than the load recorded when the left sharpening motor is unloaded multiplied by the preset sharpening force percentage, the left push motor is triggered to move once, and the movement displacement is the preset push displacement of the push motor once. When the conditions are not met, the left push motor does not move, and the action of the right push motor is the same as the left push motor. The two motors are independently controlled and will not interfere with each other, as shown in the following: IF #grind1axis.StatusTorqueData.ActualTorque<#grind1no-load torque* (1+#grinding thrust / 100) THEN #Relative[0].Distance:=#Advance span; #Relative[0].Execute:=TRUE; END_IF; IF #grind2axis.StatusTorqueData.ActualTorque<#grind2no-load torque* (1+#grinding thrust / 100) THEN #Relative[1].Distance:= #Advance span; #Relative[1].Execute:=TRUE; END_IF; S6: After the knife sharpening is completed, the programmable logic controller controls the propulsion motor to retract and drives the grinding wheel to retract. When the knife sharpening signal is turned off, the propulsion motor homing position parameter is given, and the propulsion motor action is triggered at the same time, and the forward rotation signal of the knife sharpening motor is turned off. The principle is the same as steps S1 and S4, and the no-load load value of the knife sharpening motor measured in step S3 is cleared, which is expressed as: #absolute[0].Position:= 0.0; #absolute[0].Execute:= TRUE; #absolute[1].Position:= 0.0; #absolute[1].Execute:= TRUE; #Jog[0].JogForward:= FALSE; #Jog[2].JogForward:= FALSE; # Grind 1 no-load torque: = 0; # Grind 2 no-load torque: = 0.

[0006] Furthermore, the inclination direction of the first grinding wheel and the second grinding wheel is: in the third direction, the inclination direction of the first grinding wheel is gradually inclined from top to bottom toward the direction of the knife belt, and the highest point and the lowest point of the first grinding wheel are respectively located on both sides of the second direction of the knife belt; the inclination direction of the second grinding wheel is gradually inclined from top to bottom toward the direction of the knife belt, and the highest point and the lowest point of the second grinding wheel are respectively located on both sides of the second direction of the knife belt, and the highest point of the second grinding wheel and the highest point of the first grinding wheel are respectively located on both sides of the second direction of the knife belt.

[0007] Furthermore, the knife sharpening motor and the propulsion motor are both servo motors.

[0008] Furthermore, a knife support assembly is installed on the knife sharpening mounting base, and the knife support assembly includes a knife support seat, on which a pair of parallel knife support blocks are installed, and the two knife support blocks are staggered along the long axis direction of the knife belt, and a gap is left between the two knife support blocks for the knife belt to pass through.

[0009] Furthermore, there are three knife support assemblies in total, which are distributed at intervals on both sides of the first grinding wheel and the second grinding wheel along the long axis direction of the knife belt.

[0010] The advantages of the present invention are as follows: the knife sharpening control system of the present invention sharpens the knife belt by cooperating with a unique control method, and the wear of the knife belt and the grinding wheel will not affect the sharpening quality, so there is no need to manually adjust the sharpening mechanism, and the parameters such as the sharpening force and speed are digitized, which can be adjusted and observed intuitively.

[0011] The design of the knife support assembly provides an auxiliary supporting role for the knife belt by setting two staggered knife support blocks, providing a good foundation for subsequent sharpening of the knife.

[0012] The knife sharpening control system of the present invention uses the cooperation of the first grinding wheel and the second grinding wheel set at an angle to sharpen the knife belt, and realizes the movement of the first grinding wheel and the second grinding wheel in a specific direction through the design of different positions and different inclinations and the cooperation of the first adjustment component and the second adjustment component. It not only provides a basis for the subsequent automatic adjustment of the distance between the sharpening knife and the knife belt, but also avoids the problems of angle and force caused by manual adjustment.

[0013] Servo motors are used for both the sharpening motor and the propulsion motor. Four servos are used to cooperate with the programmable logic controller. Two servos are used to drive the rotation of the two grinding wheels respectively. The working status of the grinding wheels can be understood by real-time monitoring of the motors. The other two servos push the grinding wheels to move. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 It is a schematic diagram of the knife sharpening control system of the present invention.

[0016] Figure 2 It is a front view of the knife sharpening control system of the present invention.

[0017] Figure 3 It is a side view of the knife sharpening control system of the present invention.

[0018] Figure 4 It is a top view of the knife sharpening control system of the present invention.

[0019] Figure 5 for Figure 1 An enlarged schematic diagram of part A.

[0020] Figure 6 It is a schematic diagram of the cooperation between the second adjustment component and the knife belt in the present invention.

[0021] Figure 7 It is a front view of the cooperation between the second adjustment component and the knife belt in the present invention.

[0022] Figure 8 It is a top view of the cooperation between the second adjustment component and the knife belt in the present invention. DETAILED DESCRIPTION

[0023] The following embodiments can enable those skilled in the art to more fully understand the present invention, but the present invention is not limited to the scope of the embodiments.

[0024] like Figure 1-Figure 8 The knife sharpening control system shown in the figure is used to sharpen the knife belt 1 for sponge cutting. The automatic knife sharpening mechanism includes A knife sharpening mounting base 2 is fixed on the sponge cutting machine, and the knife sharpening mounting base 2 is a rectangular plate. Grinding wheels distributed on both sides of the knife belt 1 are installed on the knife sharpening mounting base 2. The two grinding wheels are driven to rotate by independent knife sharpening motors respectively, and the two grinding wheels are defined as a first grinding wheel 3 and a second grinding wheel 4 respectively. The first grinding wheel 3 is driven to rotate by a left knife sharpening motor 31 to grind the knife belt 1, and the second grinding wheel 4 is driven to rotate by a right knife sharpening motor 41 to grind the knife belt 1.

[0025] The long axis direction of the knife belt 1 in the horizontal direction is defined as the first direction, the direction horizontally perpendicular to the first direction is defined as the second direction, and the direction vertically perpendicular to the first direction is defined as the third direction. The first grinding wheel 3 and the second grinding wheel 4 are respectively driven by independent first adjustment components to move along the third direction.

[0026] The first grinding wheel 3 and the second grinding wheel 4 are distributed on both sides of the knife belt 1 along the second direction, and the first grinding wheel 3 and the second grinding wheel 4 are arranged obliquely.

[0027] like Figure 4 As shown, when the knife belt 1 is horizontal, in the third direction, the inclination direction of the first grinding wheel 3 is gradually inclined from top to bottom toward the knife belt 1, and the highest point and the lowest point of the first grinding wheel 3 are respectively located on both sides of the second direction of the knife belt 1; the inclination direction of the second grinding wheel 4 is gradually inclined from top to bottom toward the knife belt 1, and the highest point and the lowest point of the second grinding wheel 4 are respectively located on both sides of the second direction of the knife belt 1, and the highest point of the second grinding wheel 4 and the highest point of the first grinding wheel 3 are respectively located on both sides of the second direction of the knife belt 1.

[0028] The first adjustment component includes a transmission base plate 5, a propulsion motor 52, an adjustment screw 51 and a movable plate 53, wherein the transmission base plate 5 is a rectangular plate, the transmission base plate 5 is installed on one side of the sharpening mounting base 2, and a structural reinforcement plate 59 is also provided at the bottom end of the transmission base plate 5. The structural reinforcement plate 59 is a triangular plate. The structural reinforcement plate 59 is provided to strengthen the connection structure between the transmission base plate 5 and the sharpening mounting base 2, thereby ensuring the stable fixation of the transmission base plate 5.

[0029] The propulsion motor 52 is installed on the other side of the knife sharpening mounting base 2 through a motor fixing base 54. The motor fixing base 54 is a U-shaped structure. The upper and lower sides of the motor fixing base 54 are fixed on the knife sharpening mounting base 2. At the same time, the upper and lower sides of the motor fixing base 54 also have flange structures for fixing. A through hole is also opened on the motor fixing base 54 to allow the output shaft of the propulsion motor 52 to pass through.

[0030] The adjusting screw 51 extends along the third direction, and one side of the adjusting screw 51 is installed on the transmission base plate 5 through the cooperation of the screw support seat 55, and between the adjusting screw 51 and the screw support seat 55, the other side of the adjusting screw 51 passes through the sharpening mounting base 2 and is connected to the propulsion motor 52, and the adjusting screw 51 is driven by the propulsion motor 52 to rotate, and a screw nut 56 is provided on the adjusting screw 51 for use therewith.

[0031] The movable plate 53 is connected to the screw nut 56. An adjusting guide rail 57 is also provided on the transmission base plate 5 beside the adjusting screw 51. The adjusting guide rail 57 is distributed parallel to the adjusting screw 51. At the same time, a slider 58 used in conjunction with the adjusting guide rail 57 is installed on the movable plate 53. The movable plate 53 is driven by the adjusting screw 51 to reciprocate along the third direction.

[0032] The sharpening motor is mounted on the moving plate 53, and moves back and forth along the third direction with the moving plate 53. The connection between the sharpening motor and the moving plate 53 is as follows: the sharpening motor is fixed on a motor fixing seat 6, and the motor fixing seat 6 and the moving plate 53 are fixed by the cooperation of bolts and nuts. A through hole for the bolt to pass through is opened on the moving plate 53, and a waist-shaped hole for the bolt to pass through is opened on the motor fixing seat 6. After the bolt passes through the through hole on the moving plate 53 and the waist-shaped hole on the motor fixing seat 6 in turn, it is locked by the nut to achieve the fixation between the moving plate 53 and the motor fixing seat 6. The waist-shaped hole design on the motor fixing seat 6 is to facilitate the subsequent fine adjustment of the relative position between the motor fixing seat 6 and the moving plate 53, so as to achieve the fine adjustment of the angle and spacing between the corresponding grinding wheel and the knife belt 1.

[0033] The structure of the second adjustment component is similar to that of the first adjustment component. Figure 6-Figure 8 As shown in the schematic diagram of , the structural composition of the second adjustment component is the same as that of the first adjustment component, except that: in the second adjustment component, the adjustment screw 51 used to drive the left knife sharpening motor 31 or the right knife sharpening motor 41 to move extends along the second direction, and correspondingly, the adjustment guide rail 57 in the second adjustment component also extends along the second direction. In addition, in the second adjustment component, the adjustment motor 52 and the adjustment screw 51 are distributed on the same side of the knife sharpening mounting base 2, and the motor fixing seat 54 used to fix the adjustment motor 52 in the second adjustment component is a rectangular plate. Through such a design, the adjustment screw 51 can drive the left knife sharpening motor 31 or the right knife sharpening motor 41 to move along the second direction when rotating.

[0034] A knife support assembly is also installed on the knife sharpening mounting base 2, such as Figure 5 As shown, the knife support assembly includes a knife support seat 6, which is directly fixed on the knife sharpening installation base 2, and a pair of parallel knife support blocks 61 are installed on the knife support seat 6. The knife support blocks 61 are fixed on the knife support seat 6 by bolts, and the two knife support blocks 61 are staggered along the long axis direction of the knife belt 1, and a gap is left between the two knife support blocks 61 for the knife belt 1 to pass through. The design of the knife support assembly plays an auxiliary role in supporting the knife belt by setting two staggered knife support blocks 61, which provides a good foundation for the subsequent sharpening of the knife.

[0035] There are three knife support assemblies, which are spaced apart on both sides of the first grinding wheel 3 and the second grinding wheel 4 along the long axis direction of the knife belt 1. The design of three knife support assemblies spaced apart on both sides of the first grinding wheel 3 and the second grinding wheel 4 is adopted, so that whether the knife belt 1 is sharpened by the first grinding wheel 3 or the second grinding wheel 4, it can be ensured that there is a knife support assembly on both sides of the grinding wheel to support the knife belt 1, thereby ensuring the sharpening effect.

[0036] When it is necessary to adjust the relative position between the first grinding wheel 3 or the second grinding wheel 4 and the knife belt 1, the adjusting motor 52 corresponding to the first grinding wheel 3 or the second grinding wheel 4 is activated to drive the adjusting screw 51 to rotate, and the rotation of the adjusting screw 51 will drive the movable plate 53 to move along the third direction or the second direction, and then drive the corresponding first grinding wheel 3 or the second grinding wheel 4 to move along the third direction or the second direction, thereby realizing the adjustment of the distance between the first grinding wheel 3 or the second grinding wheel 4 and the knife belt 1, so as to utilize the first grinding wheel 3 or the second grinding wheel 4 to better grind the blade of the knife belt 1.

[0037] A programmable logic controller is connected to the knife sharpening motor and the propulsion motor 52 and is used to control the start and stop of the knife sharpening motor and the start and stop of the propulsion motor 52.

[0038] Two propulsion motors 52 are defined, wherein the propulsion motor 52 for driving the first grinding wheel 3 to move is a left propulsion motor, and the propulsion motor 52 for driving the second grinding wheel 4 to move is a right propulsion motor.

[0039] The control method of the above-mentioned knife sharpening control system is: S1: First, the PLC receives the sharpening signal, and then starts the two sharpening motors and sets the speed of the sharpening motors to V 初 , the two grinding motors rotate, among which #Jog[0].JogForward and #Jog[2].JogForward are the forward start commands of the grinding motors, which are expressed as: #Jog[0].JogForward:=TRUE; #Jog[2].JogForward:=TRUE; S2: The programmable logic controller detects the speed of the knife sharpening motor. When it is detected that the speed of the knife sharpening motor reaches the predetermined speed, the next step is entered. #Grinding 1 axis. Actual Velocity, #Grinding 2 axis. Actual Velocity are the real-time speeds of the two knife sharpening motors. Grinding 1 is the left knife sharpening motor 31, and the grinding 1 axis is the output shaft of the left knife sharpening motor 31. Grinding 2 is the right knife sharpening motor 41, and the grinding 2 axis is the output shaft of the right knife sharpening motor 41. When the real-time speed of the knife sharpening motor is greater than or equal to V 初 When entering step S3, it is shown as follows: # Grind axis 1. ActualVelocity>=V 初 AND #grind axis 2.ActualVelocity>= V 初 ; S3: The programmable logic controller reads the load value of the grinding motor when the grinding wheel is unloaded and records it, where #Grinding1Axis.StatusTorqueData.ActualTorque and #Grinding2Axis.StatusTorqueData.ActualTorque are the real-time loads of the grinding motor, #Grinding1 No-load Torque and #Grinding2 No-load Torque are the no-load torque recording areas. When the no-load torque #Grinding1 No-load Torque of the left grinding motor is less than the real-time torque #Grinding1Axis.StatusTorqueData.ActualTorque, the real-time torque #Grinding1Axis.StatusTorqueData.ActualTorque is assigned to the no-load torque #Grinding1 No-load Torque. The no-load torque reading method of the right grinding motor is the same as that of the left grinding motor, as shown below: IF #Grind1No-loadTorque<#Grind1Axis.StatusTorqueData.ActualTorque THEN #Grind 1 no-load torque:= #Grind 1 axis.StatusTorqueData.ActualTorque; END_IF; IF #Grind2No-loadTorque<#Grind2Axis.StatusTorqueData.ActualTorque THEN #Grind 2 no-load torque:=#Grind 2 axis.StatusTorqueData.ActualTorque; END_IF; The grinding wheel torque reading time is 1 second. When the time is reached and there is a value in the no-load torque address, go to step S4; S4: The programmable logic controller starts the propulsion motor and drives the grinding wheel to quickly position near the knife belt according to the preset value. #Absolute[0].Position and #Absolute[1].Position are the propulsion motor parameter setting areas. #Absolute[0].Execute and #Absolute[1].Execute are the propulsion motor start trigger points. #Feed Position is the preset position area. The preset value is assigned to the corresponding area of ​​the propulsion motor and the propulsion motor is triggered to move. It manifests as: #absolute[0].Position:=#feed position; #absolute[1].Position:=#feed position; #absolute[0].Execute:=TRUE; #absolute[1].Execute:=TRUE; When the propulsion motor reaches the predetermined position, the process goes to step S5; S5: The programmable logic controller starts the sharpening motor, drives the grinding wheel to rotate, starts sharpening, slowly pushes the grinding wheel to contact the knife belt, and determines whether to continue pushing according to the real-time load of the sharpening motor. #Sharpening thrust is the preset sharpening force value, #Propulsion span is the preset push displacement of the push motor once, when the real-time load of the left sharpening motor is less than the load recorded when the left sharpening motor is unloaded multiplied by the preset sharpening force percentage, the left push motor is triggered to move once, and the movement displacement is the preset push displacement of the push motor once. When the conditions are not met, the left push motor does not move, and the action of the right push motor is the same as the left push motor. The two motors are independently controlled and will not interfere with each other, as shown in the following: IF #grind1axis.StatusTorqueData.ActualTorque<#grind1no-load torque* (1+#grinding thrust / 100) THEN #Relative[0].Distance:=#Advance span; #Relative[0].Execute:=TRUE; END_IF; IF #grind2axis.StatusTorqueData.ActualTorque<#grind2no-load torque* (1+#grinding thrust / 100) THEN #Relative[1].Distance:= #Advance span; #Relative[1].Execute:=TRUE; END_IF; S6: After the knife sharpening is completed, the programmable logic controller controls the propulsion motor to retract and drives the grinding wheel to retract. When the knife sharpening signal is turned off, the propulsion motor homing position parameter is given, and the propulsion motor action is triggered at the same time, and the forward rotation signal of the knife sharpening motor is turned off. The principle is the same as steps S1 and S4, and the no-load load value of the knife sharpening motor measured in step S3 is cleared, which is expressed as: #absolute[0].Position:= 0.0; #absolute[0].Execute:= TRUE; #absolute[1].Position:= 0.0; #absolute[1].Execute:= TRUE; #Jog[0].JogForward:= FALSE; #Jog[2].JogForward:= FALSE; # Grind 1 no-load torque: = 0; # Grind 2 no-load torque: = 0.

[0040] The knife sharpening control system of the present invention sharpens the knife belt by cooperating with a unique control method, and the wear of the knife belt and the grinding wheel will not affect the sharpening quality, so there is no need to manually adjust the sharpening mechanism, and the parameters such as the sharpening force and speed are digitized through the programmable logic controller, which can be adjusted and observed intuitively.

[0041] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A knife sharpening control system, which is used to sharpen a knife belt for sponge cutting, and is characterized by: include A knife sharpening mounting base, on which grinding wheels distributed on both sides of a knife belt are mounted, the two grinding wheels are driven to rotate by independent knife sharpening motors, and the two grinding wheels are defined as a first grinding wheel and a second grinding wheel, respectively, the long axis direction of the knife belt in the horizontal direction is defined as a first direction, the direction horizontally perpendicular to the first direction is defined as a second direction, and the direction vertically perpendicular to the first direction is defined as a third direction, the first grinding wheel and the second grinding wheel are distributed on both sides of the knife belt along the second direction, and the first grinding wheel and the second grinding wheel are arranged obliquely, and the first grinding wheel and the second grinding wheel are driven to move along the third direction by an independent first adjustment component, or are driven to move along the second direction by an independent second adjustment component; The first adjusting component comprises a transmission base plate, a propulsion motor, an adjusting screw and a moving plate, wherein the transmission base plate is mounted on one side of the knife sharpening mounting base, the propulsion motor is mounted on the other side of the knife sharpening mounting base through a motor fixing base, one side of the adjusting screw is mounted on the transmission base plate through the cooperation of a screw support base, the other side of the adjusting screw is connected to the propulsion motor after passing through the knife sharpening mounting base, and is driven to rotate by the propulsion motor, a screw nut for use with the adjusting screw is provided on the adjusting screw, the moving plate is connected to the screw nut, an adjusting guide rail is also provided on the transmission base plate beside the adjusting screw, and a slider for use with the adjusting guide rail is installed on the moving plate, the moving plate is driven by the adjusting screw to reciprocate along the third direction, the knife sharpening motor is mounted on the moving plate, and reciprocates along the third direction with the moving plate; The structure of the second adjustment component is similar to that of the first adjustment component; A programmable logic controller, which is connected to the knife sharpening motor and the propulsion motor and is used to control the start and stop of the knife sharpening motor and the start and stop of the propulsion motor; A sharpening motor and a propulsion motor are defined respectively, wherein the sharpening motor for driving the first grinding wheel to rotate is the left sharpening motor, the sharpening motor for driving the second grinding wheel to rotate is the right sharpening motor, the propulsion motor for driving the first grinding wheel to move is the left propulsion motor, and the propulsion motor for driving the second grinding wheel to move is the right propulsion motor; The control method of the knife sharpening control system is: S1: First, the PLC receives the sharpening signal, and then starts the two sharpening motors and sets the speed of the sharpening motors to V 初 , the two grinding motors rotate, among which #Jog[0].JogForward and #Jog[2].JogForward are the forward start commands of the grinding motors, which are expressed as: #Jog[0].JogForward:= TRUE; #Jog[2].JogForward:= TRUE; S2: The programmable logic controller detects the speed of the grinding motor. When it detects that the speed of the grinding motor reaches the preset speed, it proceeds to the next step. #Grinding 1 axis. Actual Velocity, #Grinding 2 axis. Actual Velocity are the real-time speeds of the two grinding motors. Grinding 1 is the left grinding motor, and Grinding 1 axis is the output shaft of the left grinding motor. Grinding 2 is the right grinding motor, and Grinding 2 axis is the output shaft of the right grinding motor. When the real-time speed of the grinding motor is greater than or equal to V 初 When entering step S3, it is shown as follows: # Grind axis 1. ActualVelocity>=V 初 AND #grind axis 2.ActualVelocity>= V 初 ; S3: The programmable logic controller reads the load value of the grinding motor when the grinding wheel is unloaded and records it, where #Grinding1Axis.StatusTorqueData.ActualTorque and #Grinding2Axis.StatusTorqueData.ActualTorque are the real-time loads of the grinding motor, #Grinding1 No-load Torque and #Grinding2 No-load Torque are the no-load torque recording areas. When the no-load torque #Grinding1 No-load Torque of the left grinding motor is less than the real-time torque #Grinding1Axis.StatusTorqueData.ActualTorque, the real-time torque #Grinding1Axis.StatusTorqueData.ActualTorque is assigned to the no-load torque #Grinding1 No-load Torque. The no-load torque reading method of the right grinding motor is the same as that of the left grinding motor, as shown below: IF #Grind1No-loadTorque< #Grind1Axis.StatusTorqueData.ActualTorque THEN #Grind 1 no-load torque:= #Grind 1 axis.StatusTorqueData.ActualTorque; END_IF; IF #Grind2No-loadTorque<#Grind2Axis.StatusTorqueData.ActualTorque THEN #Grind 2 no-load torque:=#Grind 2 axis.StatusTorqueData.ActualTorque; END_IF; The grinding wheel torque reading time is 1 second. When the time is reached and there is a value in the no-load torque address, go to step S4; S4: The programmable logic controller starts the propulsion motor and drives the grinding wheel to quickly position near the knife belt according to the preset value. #Absolute[0].Position and #Absolute[1].Position are the propulsion motor parameter setting areas. #Absolute[0].Execute and #Absolute[1].Execute are the propulsion motor start trigger points. #Feed Position is the preset position area. The preset value is assigned to the corresponding area of ​​the propulsion motor and the propulsion motor is triggered to move. It manifests as: #absolute[0].Position:=#feed position; #absolute[1].Position:=#feed position; #absolute[0].Execute:=TRUE; #absolute[1].Execute:=TRUE; When the propulsion motor reaches the predetermined position, the process goes to step S5; S5: The programmable logic controller starts the sharpening motor, drives the grinding wheel to rotate, starts sharpening, slowly pushes the grinding wheel to contact the knife belt, and determines whether to continue pushing according to the real-time load of the sharpening motor. #Sharpening thrust is the preset sharpening force value, #Propulsion span is the preset push displacement of the push motor once, when the real-time load of the left sharpening motor is less than the load recorded when the left sharpening motor is unloaded multiplied by the preset sharpening force percentage, the left push motor is triggered to move once, and the movement displacement is the preset push displacement of the push motor once. When the conditions are not met, the left push motor does not move, and the action of the right push motor is the same as the left push motor. The two motors are independently controlled and will not interfere with each other, as shown in the following: IF #grind1axis.StatusTorqueData.ActualTorque < #grind1no-load torque* (1+#grinding thrust / 100) THEN #Relative[0].Distance:=#Advance span; #Relative[0].Execute:=TRUE; END_IF; IF #grind2axis.StatusTorqueData.ActualTorque < #grind2no-load torque* (1+#grinding thrust / 100) THEN #Relative[1].Distance:= #Advance span; #Relative[1].Execute:=TRUE; END_IF; S6: After the knife sharpening is completed, the programmable logic controller controls the propulsion motor to retract and drives the grinding wheel to retract. When the knife sharpening signal is turned off, the propulsion motor homing position parameter is given, and the propulsion motor action is triggered at the same time, and the forward rotation signal of the knife sharpening motor is turned off. The principle is the same as steps S1 and S4, and the no-load load value of the knife sharpening motor measured in step S3 is cleared, which is expressed as: #absolute[0].Position:= 0.0; #absolute[0].Execute:= TRUE; #absolute[1].Position:= 0.0; #absolute[1].Execute:= TRUE; #Jog[0].JogForward:= FALSE; #Jog[2].JogForward:= FALSE; # Grind 1 no-load torque: = 0; # Grind 2 no-load torque: = 0.

2. The knife sharpening control system according to claim 1, characterized in that: The inclination direction of the first grinding wheel and the second grinding wheel is: in the third direction, the inclination direction of the first grinding wheel is gradually inclined from top to bottom toward the direction of the knife belt, and the highest point and the lowest point of the first grinding wheel are respectively located on both sides of the second direction of the knife belt; the inclination direction of the second grinding wheel is gradually inclined from top to bottom toward the direction of the knife belt, and the highest point and the lowest point of the second grinding wheel are respectively located on both sides of the second direction of the knife belt, and the highest point of the second grinding wheel and the highest point of the first grinding wheel are respectively located on both sides of the second direction of the knife belt.

3. The knife sharpening control system according to claim 1, characterized in that: The knife sharpening motor and the propulsion motor are both servo motors.

4. The knife sharpening control system according to claim 1, characterized in that: A knife support assembly is also installed on the knife sharpening mounting base. The knife support assembly includes a knife support seat, on which a pair of parallel knife support blocks are installed. The two knife support blocks are staggered along the long axis direction of the knife belt, and a gap is left between the two knife support blocks for the knife belt to pass through.

5. The knife sharpening control system according to claim 4, characterized in that: There are three knife support assemblies in total, which are distributed at intervals on both sides of the first grinding wheel and the second grinding wheel along the long axis direction of the knife belt.

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