Pipe crimping machine stroke control circuit and pipe crimping machine

Abstract

The present invention discloses a tube crimping machine stroke control circuit and a tube crimping machine, and relates to the technical field of tube crimping machines. The tube crimping machine stroke control circuit includes an electronic ruler, a stroke adjustment unit, and a control unit; the moving end of the electronic ruler is fixed to the moving end of a power cylinder, moves with the moving end of the power cylinder, and generates a first signal corresponding to the moving position; the stroke adjustment unit is electrically connected to the electronic ruler, the stroke adjustment unit is used to adjust the stroke of the power cylinder, and generates a second signal corresponding to the stroke; the stroke adjustment unit is further used to receive the first signal and compare it with the second signal, and generate a third signal when the moving position of the moving end of the power cylinder corresponds to the stroke set by the stroke adjustment unit; the control unit is electrically connected to the stroke adjustment unit, and upon receiving the third signal, the control unit controls the moving end of the power cylinder to stop moving.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe crimping machines, and in particular to a pipe crimping machine stroke control circuit and the pipe crimping machine. Background Art

[0002] A pipe crimping machine (or crimping machine) is a hydraulic device used to crimp pipe assemblies. It applies a contractile force to the metal connector through the crimping machine's die, firmly crimping it onto the corresponding high-pressure oil pipes used in construction machinery, or brake pipes, engine oil pipes, air conditioning pipes, and power pipes used in automobiles. The crimping machine is suitable for crimping various types of high- and low-pressure oil pipes, air pipes, water pipes, cable connectors, automotive air conditioning pipes, automotive power steering pipes, engine oil pipes, gasoline supply pipes, as well as construction accessories and household hot water and gas pipes. It is widely used in industries such as vehicles, construction machinery, hydraulic machinery, and welding and cutting equipment.

[0003] At present, the stroke of the pipe crimping machine is mostly adjusted by mechanical devices, but its accuracy is not high and there is no automatic protection device. Once a fault occurs, the device is easily damaged. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a tube crimping machine stroke control circuit and a tube crimping machine, which are used to solve the problems of low accuracy and easy damage of the device caused by the current use of mechanical devices to adjust the stroke of the tube crimping machine.

[0005] According to a first aspect of the present invention, there is provided a tube crimping machine stroke control circuit, comprising an electronic ruler, a stroke adjustment unit, and a control unit;

[0006] The moving end of the electronic ruler is fixed to the moving end of the power cylinder. The moving end of the electronic ruler moves along with the moving end of the power cylinder and generates a first signal corresponding to the moving position.

[0007] The stroke adjustment unit is electrically connected to the electronic ruler, and is used to adjust the stroke of the power cylinder and generate a second signal corresponding to the stroke. The stroke adjustment unit is also used to receive the first signal and compare it with the second signal, and generate a third signal when the moving position of the moving end of the power cylinder corresponds to the stroke set by the stroke adjustment unit;

[0008] The control unit is electrically connected to the stroke adjustment unit. When the control unit receives the third signal, it controls the moving end of the power cylinder to stop moving.

[0009] The tube crimping machine stroke control circuit of the present invention accurately detects the moving position of the moving end of the power cylinder through an electronic ruler, and adjusts the stroke of the power cylinder through a stroke adjustment unit. When the moving position of the moving end of the power cylinder corresponds to the stroke set by the stroke adjustment unit, the control unit controls the moving end of the power cylinder to stop moving, thereby achieving precise control, thereby solving the problems of low accuracy and easy damage to the device caused by the current use of mechanical devices to adjust the stroke of the tube crimping machine.

[0010] In some embodiments, the stroke adjustment unit includes a release stroke adjustment unit and a press stroke adjustment unit;

[0011] The release stroke adjustment unit is electrically connected between the electronic ruler and the control unit, and is used to adjust the release stroke of the power cylinder;

[0012] The pressing stroke adjustment unit is electrically connected between the electronic ruler and the control unit, and is used to adjust the pressing stroke of the power cylinder. Thus, the release stroke of the power cylinder is adjusted by the release stroke adjustment unit, and the pressing stroke of the power cylinder is adjusted by the pressing stroke adjustment unit.

[0013] In some embodiments, the release stroke adjustment unit includes a fourteenth adjustable potentiometer and a first comparator;

[0014] The non-inverting input terminal of the first comparator is electrically connected to the output terminal of the electronic ruler, the inverting input terminal of the first comparator is electrically connected to the adjustment terminal of the fourteenth adjustable potentiometer, and the output terminal of the first comparator is electrically connected to the control unit. Thus, the adjustment range of the fourteenth adjustable potentiometer corresponds to the adjustment range of the release stroke.

[0015] In some embodiments, the release stroke adjustment unit further includes an upper limit limiting unit and a lower limit limiting unit;

[0016] The upper limit limiting unit is electrically connected to the first end of the fourteenth adjustable potentiometer, and the upper limit limiting unit is used to limit the upper limit voltage of the fourteenth adjustable potentiometer; and / or

[0017] The lower limit limiting unit is electrically connected to the second end of the fourteenth adjustable potentiometer and is configured to limit the lower limit voltage of the fourteenth adjustable potentiometer. Thus, the upper limit limiting unit can change the upper limit voltage of the fourteenth adjustable potentiometer, and the lower limit limiting unit can change the lower limit voltage of the fourteenth adjustable potentiometer, thereby changing the adjustment range of the fourteenth adjustable potentiometer. Furthermore, the original release stroke adjustment range can be further changed based on the adjustment range of the release stroke corresponding to the fourteenth adjustable potentiometer.

[0018] In some embodiments, the upper limit limiting unit includes a twelfth adjustable resistor, an adjustment end of the twelfth adjustable resistor is electrically connected to the VCC end, and a second end of the twelfth adjustable resistor is electrically connected to the first end of a fourteenth adjustable potentiometer; and / or

[0019] The lower limit limiting unit includes a thirteenth adjustable resistor, an adjustment end of the thirteenth adjustable resistor being electrically connected to the second end of the fourteenth adjustable potentiometer, and the second end of the thirteenth adjustable resistor being grounded. Thus, the upper limit voltage of the fourteenth adjustable potentiometer is changed by the twelfth adjustable resistor, and the lower limit voltage of the fourteenth adjustable potentiometer is changed by the thirteenth adjustable resistor.

[0020] In some embodiments, the buckling stroke adjustment unit includes an eighteenth adjustable resistor and a second comparator;

[0021] A first end of the eighteenth adjustable resistor is electrically connected to the positive terminal of the power supply of the electronic ruler, and a second end of the eighteenth adjustable resistor is grounded;

[0022] The non-inverting input terminal of the second comparator is electrically connected to the adjustment terminal of the eighteenth adjustable resistor, and the inverting input terminal of the second comparator is electrically connected to the output terminal of the electronic ruler. Therefore, the adjustment range of the eighteenth adjustable resistor corresponds to the adjustment range of the buckling stroke.

[0023] In some embodiments, the crimping stroke adjustment unit further includes an isolated adjustable voltage unit electrically connected between the inverting input of the second comparator and the output of the electronic ruler, and configured to adjust the voltage input to the inverting input of the second comparator. Thus, by controlling the voltage input to the second comparator by the electronic ruler via the isolated adjustable voltage unit, the crimping stroke can be precisely adjusted within its adjustment range.

[0024] In some embodiments, the isolated adjustable voltage unit includes an isolated power supply, a voltage stabilizing unit, a fifteenth adjustable resistor, and a nineteenth adjustable resistor;

[0025] The positive terminal of the input voltage of the isolation power supply is electrically connected to the positive terminal of the power supply of the electronic ruler, the negative terminal of the input voltage of the isolation power supply is grounded, and the negative terminal of the output voltage of the isolation power supply is electrically connected to the inverting input terminal of the second comparator;

[0026] The input voltage terminal of the voltage stabilizing unit is electrically connected to the output voltage positive terminal of the isolated power supply;

[0027] The second end of the fifteenth adjustable resistor is electrically connected to the negative terminal of the output voltage of the isolated power supply, and the adjustment end of the fifteenth adjustable resistor is electrically connected to the adjustment end of the voltage stabilizing unit;

[0028] The first end of the nineteenth adjustable resistor is electrically connected to the output voltage terminal of the voltage stabilizing unit, the second end of the nineteenth adjustable resistor is electrically connected to the second end of the fifteenth adjustable resistor, and the adjustment end of the nineteenth adjustable resistor is electrically connected to the output end of the electronic ruler. Thus, by adjusting the output voltage of the voltage stabilizing unit through the fifteenth adjustable resistor, the nineteenth adjustable resistor adjusts the voltage input to the second comparator by the voltage stabilizing unit, thereby enabling the isolated adjustable voltage unit to control the voltage input to the second comparator of the electronic ruler, thereby enabling precise adjustment within the adjustment range of the crimping stroke.

[0029] In some embodiments, the control unit includes a second transistor, a second relay, a first transistor, and a first relay;

[0030] The base of the second triode is electrically connected to the first output terminal of the stroke adjustment unit, and the emitter of the second triode is grounded;

[0031] The first voltage terminal of the second relay is electrically connected to the positive terminal of the power supply of the electronic ruler, and the second voltage terminal of the second relay is electrically connected to the collector of the second transistor; and / or

[0032] The base of the first transistor is electrically connected to the second output terminal of the stroke adjustment unit, and the emitter of the first transistor is grounded;

[0033] The first voltage terminal of the first relay is electrically connected to the positive terminal of the electronic ruler's power supply, and the second voltage terminal of the first relay is electrically connected to the collector of the first transistor. Thus, the second transistor drives the second relay to control the release stroke, and the first transistor drives the first relay to control the clamping stroke.

[0034] According to a second aspect of the present invention, a tube crimping machine is provided. The tube crimping machine includes the above-mentioned tube crimping machine stroke control circuit.

[0035] Compared with the prior art, the tube crimping machine stroke control circuit and tube crimping machine of the present invention accurately detect the moving position of the moving end of the power cylinder through an electronic ruler, and adjust the stroke of the power cylinder through a stroke adjustment unit. When the moving position of the moving end of the power cylinder corresponds to the stroke set by the stroke adjustment unit, the control unit controls the moving end of the power cylinder to stop moving, thereby achieving precise control, thereby solving the problems of low accuracy and easy damage to the device caused by the current use of mechanical devices to adjust the stroke of the tube crimping machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a module diagram of a pipe crimping machine stroke control circuit according to one embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of a pipe crimping machine stroke control circuit according to one embodiment of the present invention;

[0038] Figure 3 A circuit diagram of a stroke adjustment unit according to another embodiment of the present invention;

[0039] Figure 4 This is a circuit diagram of a crimping stroke adjustment unit according to another embodiment of the present invention;

[0040] Figure 5 A schematic diagram showing the connection between the hydraulic cylinder and the electronic ruler of a pipe crimping machine according to an embodiment of the present invention from a first perspective;

[0041] Figure 6 A schematic diagram from a second perspective of the connection relationship between the hydraulic cylinder and the electronic ruler of the pipe crimping machine according to one embodiment of the present invention;

[0042] Figure 7 Schematic diagram of the electronic ruler corresponding to the hydraulic cylinder's pressing stroke and releasing stroke according to one embodiment of the present invention.

[0043] Description of the accompanying drawings: electronic ruler 100, stroke adjustment unit 200, release stroke adjustment unit 210, upper limit limiting unit 211, lower limit limiting unit 212, pressing stroke adjustment unit 220, isolation adjustable voltage unit 221, control unit 300, power cylinder 400. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings.

[0045] According to a first aspect of the present invention, Figure 1-2 The figure schematically shows a tube pressing machine stroke control circuit according to an embodiment of the present invention. Figure 1-2 As shown, the tube crimping machine stroke control circuit includes an electronic ruler 100 (R17), a stroke adjustment unit 200 and a control unit 300.

[0046] like Figure 5-6 As shown, the moving end 110 of the electronic ruler 100 is fixed to the moving end 410 of the power cylinder 400. The moving end 110 of the electronic ruler 100 moves with the moving end 410 of the power cylinder 400 and generates a first signal corresponding to the moving position. That is, the fixed end 120 of the electronic ruler 100 and the fixed end 120 of the power cylinder 400 are kept stationary. The moving end 110 of the electronic ruler 100 is fixed to the moving end 410 of the power cylinder 400. The moving end 110 of the electronic ruler 100 generates a changing voltage signal as it moves with the moving end 410 of the power cylinder 400. The power cylinder 400 is a hydraulic cylinder. Of course, in other embodiments, the power cylinder 400 may also be a pneumatic cylinder.

[0047] The stroke adjustment unit 200 is electrically connected to the electronic ruler 100. The stroke adjustment unit 200 is used to adjust the stroke of the power cylinder 400 and generate a second signal corresponding to the stroke. The stroke adjustment unit 200 can adjust the stroke of the power cylinder 400 by adjusting the release stroke of the power cylinder 400 or the pressing stroke of the power cylinder 400. The stroke adjustment unit 200 is also used to receive the first signal and compare it with the second signal generated during the adjustment process. When the moving position of the moving end 410 of the power cylinder 400 corresponds to the stroke set by the stroke adjustment unit 200, a third signal is generated. That is, by comparing the first signal and the second signal, it is determined whether the moving position of the moving end 410 of the power cylinder 400 corresponds to the stroke set by the stroke adjustment unit 200, and a control signal is generated when the above conditions are met.

[0048] The control unit 300 is electrically connected to the stroke adjustment unit 200. When the control unit 300 receives the third signal, it controls the moving end 410 of the power cylinder 400 to stop moving. That is, when the stroke adjustment unit 200 determines that the moving position of the moving end 410 of the power cylinder 400 corresponds to the stroke set by the stroke adjustment unit 200, the control unit 300 controls the moving end 410 of the power cylinder 400 to stop moving.

[0049] In this embodiment, the electronic ruler 100 is used to accurately detect the moving position of the movable end 410 of the power cylinder 400, and the stroke of the power cylinder 400 is adjusted by the stroke adjustment unit 200. When the moving position of the movable end 410 of the power cylinder 400 corresponds to the stroke set by the stroke adjustment unit 200, the control unit 300 controls the movable end 410 of the power cylinder 400 to stop moving, thereby achieving precise control, thereby solving the problems of low accuracy and easy damage to the device caused by the current use of mechanical devices to adjust the stroke of the pipe crimping machine.

[0050] The stroke adjustment unit 200 includes a release stroke adjustment unit 210 and a pressing stroke adjustment unit 220; the release stroke adjustment unit 210 is electrically connected between the electronic ruler 100 and the control unit 300, and is used to adjust the release stroke of the power cylinder 400; the pressing stroke adjustment unit 220 is electrically connected between the electronic ruler 100 and the control unit 300, and is used to adjust the pressing stroke of the power cylinder 400. Figure 7 As shown, the limit of the pressing and releasing strokes of the power cylinder 400 is controlled by the electronic ruler 100 and the stroke adjustment unit 200. Correspondingly, the pressing stroke adjustment unit 220 enables fine adjustment of the pressing size (AB) of the power cylinder 400, and the release stroke adjustment unit 210 enables adjustment of the release end point (CD) of the power cylinder 400.

[0051] The release stroke adjustment unit 210 includes a fourteenth adjustable potentiometer R14 and a first comparator in the dual voltage comparator U1. The model of the dual voltage comparator U1 is LM393. The non-inverting input terminal INA+ of the dual voltage comparator U1 (first comparator) is electrically connected to the output terminal of the electronic ruler 100 through the sixth resistor R6. The non-inverting input terminal INA+ of the dual voltage comparator U1 (first comparator) is grounded through the second capacitor C2. The inverting input terminal INA- of the dual voltage comparator U1 (first comparator) is electrically connected to the adjustment terminal of the fourteenth adjustable potentiometer R14 through the fifth resistor R5. The dual voltage comparator U1 (first comparator) An inverting input terminal INA- of the dual-voltage comparator U1 (first comparator) is also grounded via a first resistor R1 and a third capacitor C3. An output terminal OUTA of the dual-voltage comparator U1 (first comparator) is electrically connected to the control unit 300 via an eleventh resistor R11. The output terminal OUTA of the dual-voltage comparator U1 (first comparator) is electrically connected to the positive power supply terminal of the electronic ruler 100 via a seventh resistor R7. A VCC terminal of the dual-voltage comparator U1 is electrically connected to the positive power supply terminal of the electronic ruler 100, and a GND terminal of the dual-voltage comparator U1 is grounded. The positive power supply terminal of the electronic ruler 100 is connected to +24V, and the negative power supply terminal of the electronic ruler 100 is grounded.

[0052] The release stroke adjustment unit 210 also includes an upper limit limiting unit 211 and a lower limit limiting unit 212; the upper limit limiting unit 211 is electrically connected to the first end of the fourteenth adjustable potentiometer R14, and the upper limit limiting unit 211 is used to limit the upper limit voltage of the fourteenth adjustable potentiometer R14; the lower limit limiting unit 212 is electrically connected to the second end of the fourteenth adjustable potentiometer R14, and the lower limit limiting unit 212 is used to limit the lower limit voltage of the fourteenth adjustable potentiometer R14.

[0053] The upper limit limiting unit 211 includes a twelfth adjustable resistor R12, the adjustment end and the first end of the twelfth adjustable resistor R12 are electrically connected to the VCC end, and the second end of the twelfth adjustable resistor R12 is electrically connected to the first end of the fourteenth adjustable potentiometer R14; the lower limit limiting unit 212 includes a thirteenth adjustable resistor R13, the adjustment end and the first end of the thirteenth adjustable resistor R13 are electrically connected to the second end of the fourteenth adjustable potentiometer R14, and the second end of the thirteenth adjustable resistor R13 is grounded.

[0054] The electronic ruler 100 and the fourteenth adjustable potentiometer R14 form two comparison voltages. The electronic ruler 100 generates a voltage in the range of 0-24V and inputs it to the non-inverting input terminal INA+ (pin 3) of the dual voltage comparator U1. The twelfth adjustable resistor R12, the thirteenth adjustable resistor R13 and the fourteenth adjustable potentiometer R14 form upper and lower limit voltages and output them to the inverting input terminal INA- (pin 2) of the dual voltage comparator U1. The twelfth adjustable resistor R12 limits the upper limit voltage (U6) of the fourteenth adjustable potentiometer R14. The thirteenth adjustable resistor R13 limits the lower limit voltage (U7) of the fourteenth adjustable potentiometer R14. Voltages U6 and U7 determine the voltage of the fourteenth adjustable potentiometer R14. Points C and D of the electronic ruler 100 can be determined by adjusting the twelfth adjustable resistor R12 and the thirteenth adjustable resistor R13. When the fourteenth adjustable potentiometer R14 slides, a voltage within the range of U6-U7 is generated and input to the inverting input terminal INA- of the dual voltage comparator U1. When the electronic ruler 100 moves in direction b, the power cylinder 400 releases, and the output voltage of the electronic ruler 100 gradually increases. When the voltage exceeds the reference voltage of the fourteenth adjustable potentiometer R14, the output terminal OUTA of the dual voltage comparator U1 generates a control signal. The control unit 300 receives the control signal and controls the moving end 410 of the power cylinder 400 to stop moving.

[0055] In other embodiments, Figure 3 As shown, a separate first comparator U11 can be used to replace the first comparator in the dual voltage comparator U1, wherein the adjustment end and the first end of the twelfth adjustable resistor R12 are electrically connected to the VCC end, and the second end of the twelfth adjustable resistor R12 is electrically connected to the first end of the fourteenth adjustable potentiometer R14; the adjustment end and the first end of the thirteenth adjustable resistor R13 are electrically connected to the second end of the fourteenth adjustable potentiometer R14, and the second end of the thirteenth adjustable resistor R13 is grounded; the fourteenth adjustable potentiometer R14 The adjustment end is electrically connected to the inverting input end of the first comparator U11; the non-inverting input end of the first comparator U11 is electrically connected to the output end of the electronic ruler 100 (R17), the VCC end of the first comparator U11 is connected to VCC, the GND end of the first comparator U11 is grounded, the inverting input end and the output end of the first comparator U11 are electrically connected through the twentieth resistor R20, the positive power supply end of the electronic ruler 100 (R17) is connected to VCC, and the negative power supply end of the electronic ruler 100 (R17) is grounded.

[0056] The pressing stroke adjustment unit 220 includes an eighteenth adjustable resistor R18, a second comparator in the dual voltage comparator U1, and an isolated adjustable voltage unit 221; the first end of the eighteenth adjustable resistor R18 is electrically connected to the positive terminal of the power supply of the electronic ruler 100, and the second end of the eighteenth adjustable resistor R18 is grounded; the in-phase input terminal INB+ of the dual voltage comparator U1 (second comparator) is electrically connected to the adjustment terminal of the eighteenth adjustable resistor R18 through the fourth resistor R4, the in-phase input terminal INB+ of the dual voltage comparator U1 (second comparator) is grounded through the first capacitor C1, and the inverting terminal INB+ of the dual voltage comparator U1 (second comparator) is grounded. The input terminal INB- is electrically connected to the output terminal of the isolated adjustable voltage unit 221 via the third resistor R3. The input terminal of the isolated adjustable voltage unit 221 is electrically connected to the output terminal of the electronic ruler 100. The inverting input terminal INB- of the dual voltage comparator U1 (second comparator) is also connected to ground via the second resistor R2 and the fourth capacitor C4. The output terminal OUTB of the dual voltage comparator U1 (second comparator) is electrically connected to the control unit 300 via the sixteenth resistor R16. The output terminal OUTB of the dual voltage comparator U1 (second comparator) is electrically connected to the positive power supply terminal of the electronic ruler 100 via the eighth resistor R8. Of course, in other embodiments, the inverting input terminal INB- of the dual voltage comparator U1 (second comparator) is directly electrically connected to the output terminal of the electronic ruler 100, and the isolated adjustable voltage unit 221 is not provided.

[0057] The electronic ruler 100 and the eighteenth adjustable resistor R18 form two comparison voltages. When the electronic ruler 100 moves in direction a, the power cylinder 400 performs a pressing action, and the output voltage U8 of the electronic ruler 100 decreases. When the voltage drops below the output voltage of the eighteenth adjustable resistor R18, the output terminal OUTB of the dual-voltage comparator U1 generates a control signal. The control unit 300 receives this control signal and controls the movable end 410 of the power cylinder 400 to stop moving. The eighteenth adjustable resistor R18 stops the electronic ruler 100 when it reaches point A. To enable precise adjustment between points A and B using a potentiometer, an adjustable power supply U9 (isolated adjustable voltage unit 221) is added to the output terminal of the electronic ruler 100. At this time, the voltage U10 at the inverting input terminal INB- is equal to U8-U9. Therefore, the voltage range of U9 determines the control range from point A to point B, while the eighteenth adjustable resistor R18 determines the position of point A.

[0058] The isolated adjustable voltage unit 221 is used to adjust the voltage of the inverting input terminal INB- of the input dual voltage comparator U1 (second comparator); the isolated adjustable voltage unit 221 includes an isolated power supply U2, a voltage stabilizing unit U3, a fifteenth adjustable resistor R15 and a nineteenth adjustable resistor R19, the model of the isolated power supply U2 is HLK-B2412S-2WR3, and the model of the voltage stabilizing unit U3 is LM317; the input voltage positive terminal +VIN of the isolated power supply U2 is electrically connected to the positive terminal of the power supply of the electronic ruler 100, the input voltage negative terminal -VIN of the isolated power supply U2 is grounded, the input voltage positive terminal +VIN and the input voltage negative terminal -VIN of the isolated power supply U2 are electrically connected through the fifth capacitor C5, and the output voltage negative terminal -VOUT of the isolated power supply U2 is electrically connected to the inverting input terminal INB- of the dual voltage comparator U1 (second comparator) through the third resistor R3; the input voltage terminal VIN of the voltage stabilizing unit U3 is electrically connected to the output voltage positive terminal of the isolated power supply U2 The first end of the fifteenth adjustable resistor R15 is electrically connected to the negative output voltage terminal -VOUT of the isolated power supply U2, the output voltage terminal VOUT of the voltage stabilizing unit U3 is electrically connected to the negative output voltage terminal -VOUT of the isolated power supply U2 through the seventh capacitor C7, and the input voltage terminal VIN and the output voltage terminal VOUT of the voltage stabilizing unit U3 are electrically connected through the tenth resistor R10 and the sixth capacitor C6 respectively; the second end of the fifteenth adjustable resistor R15 is electrically connected to the negative output voltage terminal -VOUT of the isolated power supply U2, the adjustment end and the first end of the fifteenth adjustable resistor R15 are electrically connected to the adjustment end ADJUST of the voltage stabilizing unit U3, and the adjustment end of the fifteenth adjustable resistor R15 is also electrically connected to the output voltage terminal VOUT of the voltage stabilizing unit U3 through the ninth resistor R9; the first end of the nineteenth adjustable resistor R19 is electrically connected to the output voltage terminal VOUT of the voltage stabilizing unit U3, the second end of the nineteenth adjustable resistor R19 is electrically connected to the second end of the fifteenth adjustable resistor R15, and the adjustment end of the nineteenth adjustable resistor R19 is electrically connected to the output end of the electronic ruler 100. Because an independent voltage U9 needs to be added to the output end of the electronic ruler 100, an isolated adjustable regulated power supply consisting of an isolated power supply U2 and a voltage stabilizing unit U3 is used. The fifteenth adjustable resistor R15 is used to adjust the output voltage U9 of the regulated power supply. The nineteenth adjustable resistor R19 generates a voltage 0-U9, which is connected in series with the output voltage U8 of the electronic ruler 100, allowing the voltage generated by the electronic ruler 100 to be finely adjusted. Therefore, by adjusting the nineteenth adjustable resistor R19, the position of point A can be extremely finely adjusted.

[0059] In other embodiments, Figure 4As shown, a separate second comparator U12 can be used to replace the second comparator in the dual voltage comparator U1, wherein the input voltage positive terminal +VIN of the isolated power supply U2 is electrically connected to VCC, the input voltage negative terminal -VIN of the isolated power supply U2 is grounded, the input voltage terminal VIN of the voltage stabilizing unit U3 is electrically connected to the output voltage positive terminal +VOUT of the isolated power supply U2, the output voltage terminal VOUT of the voltage stabilizing unit U3 is connected to the first end of the nineteenth adjustable resistor R19, the output voltage terminal VOUT and the adjustment terminal ADJUST of the voltage stabilizing unit U3 are electrically connected through the twenty-first resistor R21, the adjustment terminal ADJUST of the voltage stabilizing unit U3 is electrically connected to the adjustment terminal and the first end of the fifteenth adjustable resistor R15, the second end of the fifteenth adjustable resistor R15 is electrically connected to the output voltage negative terminal -VOUT of the isolated power supply U2, and the tenth The second end of the fifth adjustable resistor R15 is electrically connected to the second end of the nineteenth adjustable resistor R19. The second end of the nineteenth adjustable resistor R19 is electrically connected to the inverting input end of the second comparator U12. The non-inverting input end of the second comparator U12 is electrically connected to the adjustment end of the eighteenth adjustable resistor R18. The VCC end of the second comparator U12 is connected to VCC, and the GND end of the second comparator U12 is grounded. The inverting input end and the output end of the second comparator U12 are electrically connected via the twenty-second resistor R22. The first end of the eighteenth adjustable resistor R18 is connected to VCC, and the second end of the eighteenth adjustable resistor R18 is grounded. The adjustment end of the nineteenth adjustable resistor R19 is electrically connected to the output end of the electronic ruler 100 (R17). The positive power supply terminal of the electronic ruler 100 (R17) is connected to VCC, and the negative power supply terminal of the electronic ruler 100 (R17) is grounded.

[0060] The control unit 300 includes a second transistor Q2, a second relay RLY2, a first transistor Q1, and a first relay RLY1. The model of the second relay RLY2 and the first relay RLY1 is G6S-2-24V. The base of the second transistor Q2 is electrically connected to the first output terminal of the stroke adjustment unit 200 (the output terminal OUTA of the dual voltage comparator U1) through the eleventh resistor R11, and the emitter of the second transistor Q2 is grounded. The first voltage terminal (pin 12) of the second relay RLY2 is electrically connected to the positive terminal of the power supply of the electronic ruler 100, and the second voltage terminal (pin 1) of the second relay RLY2 is electrically connected to the collector of the second transistor Q2. The first voltage terminal and the second voltage terminal of the second relay RLY2 are electrically connected to the cathode and anode of the second light-emitting diode D2, respectively. The common terminal (pin 9) of the second relay RLY2 is electrically connected to the second pin of the first wiring terminal U4. The first pin of the first wiring terminal U4 is grounded. 4 is KF350-3.5-2P; the base of the first transistor Q1 is electrically connected to the second output terminal of the stroke adjustment unit (the output terminal OUTB of the dual voltage comparator U1) through the sixteenth resistor R16, and the emitter of the first transistor Q1 is grounded; the first voltage terminal (pin 12) of the first relay RLY1 is electrically connected to the positive terminal of the power supply of the electronic ruler 100, the second voltage terminal (pin 1) of the first relay RLY1 is electrically connected to the collector of the first transistor Q1, the first voltage terminal and the second voltage terminal of the first relay RLY1 are electrically connected to the cathode and anode of the first light-emitting diode D1, respectively, the common terminal (pin 9) of the first relay RLY1 is electrically connected to pin 1 of the second wiring terminal U5, the pin 8 of the first relay RLY1 is electrically connected to pin 3 of the second wiring terminal U5, and the pin 10 of the first relay RLY1 is electrically connected to pin 2 of the second wiring terminal U5. The model of the second wiring terminal U5 is KF350-3.5-2P. When the output terminal OUTA of the dual voltage comparator U1 generates a control signal, the second transistor Q2 is turned on, and the second relay RLY2 is energized and closed, causing the power cylinder 400 to stop moving; when the output terminal OUTB of the dual voltage comparator U1 generates a control signal, the first transistor Q1 is turned on, and the first relay RLY1 is energized and closed, causing the power cylinder 400 to stop moving.

[0061] According to a second aspect of the present invention, a tube crimping machine is provided. The tube crimping machine includes the above-mentioned tube crimping machine stroke control circuit.

[0062] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A tube crimping machine stroke control circuit, characterized in that: include: an electronic ruler, wherein a moving end of the electronic ruler is fixed to a moving end of the power cylinder, the moving end of the electronic ruler moves following the moving end of the power cylinder, and generates a first signal corresponding to the moving position; a stroke adjustment unit, the stroke adjustment unit being electrically connected to the electronic ruler, the stroke adjustment unit being used to adjust the stroke of the power cylinder and generate a second signal corresponding to the stroke, the stroke adjustment unit being further used to receive the first signal and compare it with the second signal, and generate a third signal when the moving position of the moving end of the power cylinder corresponds to the stroke set by the stroke adjustment unit; The stroke adjustment unit includes: a release stroke adjustment unit, the release stroke adjustment unit being electrically connected between the electronic ruler and the control unit and being used to adjust the release stroke of the power cylinder; a pressing stroke adjustment unit, the pressing stroke adjustment unit being electrically connected between the electronic ruler and the control unit, and being used to adjust the pressing stroke of the power cylinder; A control unit is electrically connected to the stroke adjustment unit, and when the control unit receives the third signal, the control unit controls the moving end of the power cylinder to stop moving.

2. The tube crimping machine stroke control circuit according to claim 1, characterized in that: The release stroke adjustment unit includes:

14. Adjustable potentiometer; A first comparator, wherein the non-inverting input terminal of the first comparator is electrically connected to the output terminal of the electronic ruler, the inverting input terminal of the first comparator is electrically connected to the adjustment terminal of the fourteenth adjustable potentiometer, and the output terminal of the first comparator is electrically connected to the control unit.

3. The tube crimping machine stroke control circuit according to claim 2, characterized in that: The release stroke adjustment unit further includes: an upper limit limiting unit, the upper limit limiting unit being electrically connected to the first end of the fourteenth adjustable potentiometer, the upper limit limiting unit being used to limit the upper limit voltage of the fourteenth adjustable potentiometer; and / or A lower limit limiting unit is electrically connected to the second end of the fourteenth adjustable potentiometer, and is used to limit the lower limit voltage of the fourteenth adjustable potentiometer.

4. The tube crimping machine stroke control circuit according to claim 3, characterized in that: The upper limit limiting unit includes a twelfth adjustable resistor, an adjustment end of the twelfth adjustable resistor is electrically connected to the VCC end, and a second end of the twelfth adjustable resistor is electrically connected to the first end of the fourteenth adjustable potentiometer; and / or The lower limit unit includes a thirteenth adjustable resistor, an adjustment end of the thirteenth adjustable resistor is electrically connected to the second end of the fourteenth adjustable potentiometer, and the second end of the thirteenth adjustable resistor is grounded.

5. The tube crimping machine stroke control circuit according to claim 1, characterized in that: The crimping stroke adjustment unit includes: an eighteenth adjustable resistor, a first end of the eighteenth adjustable resistor being electrically connected to the positive terminal of the power supply of the electronic ruler, and a second end of the eighteenth adjustable resistor being grounded; A second comparator, wherein a non-inverting input terminal of the second comparator is electrically connected to the adjustment terminal of the eighteenth adjustable resistor, and an inverting input terminal of the second comparator is electrically connected to the output terminal of the electronic ruler.

6. The tube crimping machine stroke control circuit according to claim 5, characterized in that: The crimping stroke adjustment unit also includes an isolated adjustable voltage unit, which is electrically connected between the inverting input terminal of the second comparator and the output terminal of the electronic ruler. The isolated adjustable voltage unit is used to adjust the magnitude of the voltage input to the inverting input terminal of the second comparator.

7. The tube crimping machine stroke control circuit according to claim 6, characterized in that: The isolated adjustable voltage unit includes: an isolated power supply, wherein the positive input voltage terminal of the isolated power supply is electrically connected to the positive power terminal of the electronic ruler, the negative input voltage terminal of the isolated power supply is grounded, and the negative output voltage terminal of the isolated power supply is electrically connected to the inverting input terminal of the second comparator; a voltage stabilizing unit, wherein an input voltage terminal of the voltage stabilizing unit is electrically connected to an output voltage positive terminal of the isolated power supply; a fifteenth adjustable resistor, wherein a second end of the fifteenth adjustable resistor is electrically connected to the negative output voltage terminal of the isolated power supply, and an adjustment end of the fifteenth adjustable resistor is electrically connected to the adjustment end of the voltage stabilizing unit; A nineteenth adjustable resistor, wherein a first end of the nineteenth adjustable resistor is electrically connected to the output voltage end of the voltage stabilizing unit, a second end of the nineteenth adjustable resistor is electrically connected to the second end of the fifteenth adjustable resistor, and an adjustment end of the nineteenth adjustable resistor is electrically connected to the output end of the electronic ruler.

8. The tube crimping machine stroke control circuit according to any one of claims 1 to 7, characterized in that: The control unit comprises: a second triode, wherein a base of the second triode is electrically connected to the first output terminal of the stroke adjustment unit, and an emitter of the second triode is grounded; a second relay, wherein a first voltage terminal of the second relay is electrically connected to the positive terminal of the power supply of the electronic ruler, and a second voltage terminal of the second relay is electrically connected to the collector of the second transistor; and / or a first transistor, wherein a base of the first transistor is electrically connected to the second output end of the stroke adjustment unit, and an emitter of the first transistor is grounded; A first relay, wherein a first voltage terminal of the first relay is electrically connected to the positive terminal of the power supply of the electronic ruler, and a second voltage terminal of the first relay is electrically connected to the collector of the first transistor.

9. A pipe crimping machine, characterized in that: The invention comprises the tube pressing machine stroke control circuit according to any one of claims 1 to 8.

Images