A weft selection mechanism control system for a rapier loom

Abstract

A weft selection mechanism control system for a rapier loom belongs to the field of rapier loom control technology. It includes multiple weft selection motors, with a main controller connected to the motors within the rapier loom. The system is characterized by: a signal switching module, where the output of the main controller is connected to the input of the signal switching module, which receives working current reference signals and standby current reference signals from the main controller; a motor drive module, where the output of the signal switching module is connected to the input of the motor drive module, which receives either the working current reference signal or the standby current reference signal from the main controller; and a power output of the motor drive module connected to the multiple weft selection motors. In this weft selection mechanism control system for the rapier loom, working current or standby current signals can be output to multiple weft selection motors, enabling separate control of the current during standby and operation of the weft selection machine, reducing motor heat generation, and improving port utilization.

Description

Technical Field

[0001] A weft selection mechanism control system for a rapier loom belongs to the field of rapier loom control technology. Background Technology

[0002] Rapier looms are currently the most widely used shuttleless looms on the market, possessing the characteristics of high speed, high automation, and high-efficiency production. The weft selection mechanism is a crucial component of the rapier loom. In this mechanism, the weft selector operates driven by a weft selection motor. During operation, the main controller of the rapier loom sends control signals to the weft selection motor according to the fabric's preset program. The motor then drives the weft selector to select the appropriate weft yarn, ensuring the normal weaving process proceeds smoothly. Therefore, the main controller's control over the weft selection motor is particularly important in rapier looms.

[0003] In the prior art, the control of the weft selection motor in the rapier loom has the following shortcomings: (1) The weft selection motor is generally a low-voltage powered motor (such as a stepper motor or servo motor). In the prior art, the power supply current of the weft selection motor is the same. Although this power supply method can reduce the complexity of the power supply circuit, the weft selection motor is not in a continuous working state. Therefore, the weft selection motor itself will generate a lot of heat in the standby working state, which poses a certain safety hazard. (2) In the current rapier loom, there are generally at least eight weft selection motors. Therefore, in the prior art, when the main controller controls the weft selection motor, as the scale of the rapier loom increases, the number of weft selection motors also increases. The number of control ports of the main control board also needs to be increased accordingly, which greatly increases the difficulty of the main control board layout. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a weft selection mechanism control system for rapier looms that can output working current or standby current signals to multiple weft selection motors through the combined use of a set of signal switching modules and motor drive modules, realize separate control of the current of the weft selection machine in standby and running mode, reduce motor heat generation, improve port utilization, and reduce the difficulty of main control board layout.

[0005] The technical solution adopted by this utility model to solve its technical problem is: the weft selection mechanism control system of the rapier loom includes multiple weft selection motors, and the main controller in the rapier loom is connected to the weft selection motors, characterized in that it includes: The signal switching module is connected to the input of the main controller. The signal switching module is used to receive the working current reference signal and the standby current reference signal output by the main controller. The output of the motor drive module and the signal switching module are connected to the input of the motor drive module. The motor drive module is used to receive the working current reference signal or the standby current reference signal output by the main controller. The power output of the motor drive module is connected to multiple weft-selective motors.

[0006] Preferably, a weft yarn detection sensor is connected to the signal input terminal of the main controller, the sensor driver module is connected to the sensitivity voltage input terminal of the weft yarn detection sensor, and the signal output terminal of the main controller is connected to the input terminal of the sensor driver module.

[0007] Preferably, the signal output by the weft yarn detection sensor is connected to the signal input terminal of the main controller through an amplifier circuit and a comparator circuit.

[0008] Preferably, there is a one-to-one correspondence between the signal switching module and the motor drive module, and multiple signal switching modules and multiple motor drive modules are provided respectively.

[0009] Preferably, the signal switching module is implemented using a double-pole double-throw switch chip.

[0010] Preferably, the signal switching module uses chip U3 of model FSUSB42. Pin 1 of chip U3 is connected to one end of capacitor C5, and the other end of capacitor C5 is connected to the other end of chip U3. Pins 5 and 10 of chip U3 are grounded. The chip selection signal DI2 output by the autonomous controller is connected to pin 2 of chip U3. Pins 3 and 4 of chip U3 are connected to the motor drive module. The operating current reference signal DI5 is connected to pin 9 of chip U3. The standby current reference signal DI6 is connected to pin 7 of chip U3. The pulse input signal DI7 output by the autonomous controller is connected to pin 8 of chip U3. Pin 2 of chip U3 is also connected to one end of resistor R4. The other end of resistor R4 is connected to the anode of photodiode D1. The cathode of photodiode D1 is grounded.

[0011] Preferably, the sensor driving module includes optocoupler chips U10~U11. A 3.3V DC power supply is connected to pin 1 of optocoupler chip U10 and pins 1, 3, 5 and 7 of optocoupler chip U11. The signal DI8 output by the autonomous controller is connected to pin 2 of optocoupler chip U10 after series resistor R19. The signal DI9 output by the autonomous controller is connected to pin 2 of optocoupler chip U11 after series resistor R20. The signal DI10 output by the autonomous controller is connected to pin 4 of optocoupler chip U11 after series resistor R21. The signal DI11 output by the autonomous controller is connected to pin 6 of optocoupler chip U11 after series resistor R22. The signal DI12 output by the autonomous controller is connected to pin 8 of optocoupler chip U11 after series resistor R23. A 24V DC power supply is simultaneously connected to pin 4 of optocoupler chip U10 and pins 16, 14, and 12 of optocoupler chip U11. Pin 3 of optocoupler chip U10 is connected in series with resistor R24 ​​to the non-inverting input of integrated operational amplifier U9. Pin 15 of optocoupler chip U11 is connected in series with resistor R25 to the non-inverting input of integrated operational amplifier U9. Pin 13 of optocoupler chip U11 is connected in series with resistor R26 to the non-inverting input of integrated operational amplifier U9. Pin 11 of optocoupler chip U11 is connected in series with resistor R27 to the non-inverting input of integrated operational amplifier U9. Pin 10 of optocoupler chip U11 is connected in series with resistor R28 to the non-inverting input of integrated operational amplifier U9. Pin 9 of optocoupler chip U11 is grounded. The inverting input of the integrated operational amplifier U9 is connected to its output and one end of resistor R18. The other end of resistor R18 is connected to one end of resistor R17 and the diode D5. The anode of diode D5 and the other end of resistor R17 are connected to the sensitivity voltage input of the weft yarn detection sensor.

[0012] Compared with the prior art, the beneficial effects of this utility model are: In the weft selection mechanism control system of the rapier loom of this application, by using a set of signal switching modules and motor drive modules in combination, it is possible to output working current or standby current signals to multiple weft selection motors, realize separate control of the current of the weft selection machine in standby and running mode, reduce motor heat generation, improve port utilization, and reduce the difficulty of main control board layout.

[0013] In the weft selection mechanism control system of the rapier loom of this application, all functions are integrated into one control board, which greatly reduces costs, reduces cabinet size, eliminates cable connections between boards, reduces fault points caused by cables, and shares a CPU, eliminating the problem of data sharing restrictions between boards, making motion control more flexible.

[0014] The signal switching module uses a double-pole double-throw analog switch, which can complete the use of 8 weft selection motors with the analog signals generated by 2 DA converters. It also solves the problem of locking up and overheating when the weft selection motor is stationary. The weft detection circuit can reliably judge the weft status through the design of a window comparator circuit. In order to meet the sensitivity reference voltage requirements of the weft detector, a multi-resistor series and parallel design is adopted to achieve 16 levels of voltage output and flexible control. Attached Figure Description

[0015] Figure 1 This is a block diagram illustrating the control principle of the weft selection mechanism control system for a rapier loom.

[0016] Figure 2 This is a circuit schematic diagram of the signal switching module and the motor drive module.

[0017] Figure 3This is the circuit schematic of the sensor driver module. Detailed Implementation

[0018] Figures 1-3 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-3 The present invention will be further described below.

[0019] like Figure 1 As shown, a weft selection mechanism control system for a rapier loom includes a main controller. The signal output terminal of the main controller is connected to a signal switching module. The output terminal of the signal switching module is connected to the input terminal of a motor drive module. The output terminal of the motor drive module is connected to the drive signal input terminals of multiple weft selection motors. The motor shaft of each weft selection motor is connected to a weft selector. Similar to existing technologies, a weft yarn detection sensor is also provided in the rapier loom to determine whether the weft yarn signal is a broken weft, single weft, double weft, or multiple wefts. The signal output terminal of the weft yarn detection sensor is connected to the signal input terminal of the main controller. A sensor drive module is also provided, and its signal output terminal is connected to the input terminal of the weft yarn detection sensor. The signal output terminal of the main controller is also connected to the control signal input terminals of the motor drive module, the signal switching module, and the sensor drive module, respectively. A touch screen is also connected to the input terminal of the main controller.

[0020] like Figure 2 As shown, the signal switching module is implemented using chips U3-U4 (model FSUSB42), which are double-pole double-throw (DPDT) switch chips. Pin 1 of chip U3 is connected to one end of capacitor C5, and the other end of capacitor C5 is connected to the other end. Pins 5 and 10 of chip U3 are grounded. The chip selection signal DI2 output by the autonomous controller is connected to pin 2 of chip U3, and pins 3 and 4 of chip U3 are connected to the motor drive module. The operating current reference signal DI5 output by the autonomous controller is connected to pin 9 of chip U3, the standby current reference signal DI6 output by the autonomous controller is connected to pin 7 of chip U3, and the pulse input signal DI7 output by the autonomous controller is connected to pin 8 of chip U3. Pin 2 of chip U3 is also connected to one end of resistor R4, and the other end of resistor R4 is connected to the anode of photodiode D1. The cathode of photodiode D1 is grounded. The operating current reference signal DI5 and the standby current reference signal DI6 can be set via a touchscreen connected to the main controller.

[0021] Pin 1 of chip U4 is connected to one end of capacitor C6, and the other end of capacitor C6 is connected to pins 5 and 10 of chip U4. The chip selection signal DI4 output by the autonomous controller is connected to pin 2 of chip U4, and pins 3 and 4 of chip U4 are connected to the motor drive module. The operating current reference signal DI5 output by the autonomous controller is connected to pin 9 of chip U4, the standby current reference signal DI6 output by the autonomous controller is connected to pin 7 of chip U4, and the pulse input signal DI7 output by the autonomous controller is connected to pin 8 of chip U4. Pin 2 of chip U4 is also connected to one end of resistor R8, and the other end of resistor R8 is connected to the anode of photodiode D2, while the cathode of photodiode D2 is grounded.

[0022] The motor drive module is implemented using chips U1-U2, model MS4989. Pins 1, 4, 25, and 28 of chip U1 are connected to terminal J1, which in turn connects to the drive signal input terminals of four weft-selective motors. Pin 2 of chip U1 is connected to ground via series resistor R1, pin 16 is connected to ground via series resistor R3, pin 27 is connected to ground via series resistor R2, and pin 3 is connected to a 24V DC power supply. Pins 6, 7, 14, 21, and 29 of chip U1 are directly grounded, and pins 12, 15, and 17 are connected to the power supply VCC.

[0023] A capacitor C3 is connected between pins 8 and 9 of chip U1. Pin 10 of chip U1 is connected to a 24V DC power supply through capacitor C1. Pin 26 of chip U1 is grounded through capacitor C4. Pin 11 of chip U1 is grounded through capacitor C2. Pin 22 of chip U1 is connected to signal DI1, which is the direction input signal output by the main controller. Pin 23 of chip U1 is left floating. Pin 19 of chip U1 is connected to pin 4 of chip U3, and pin 20 of chip U1 is connected to pin 3 of chip U3.

[0024] Pins 1, 4, 25, and 28 of chip U2 are connected to terminal J2, which in turn connects to the drive signal input terminals of four weft-selective motors. Pin 2 of chip U2 is connected to ground via series resistor R5, pin 16 is connected to ground via series resistor R7, pin 27 is connected to ground via series resistor R6, and pin 3 is connected to a 24V DC power supply. Pins 6, 7, 14, 21, and 29 of chip U2 are directly grounded, and pins 12, 15, and 17 are connected to the power supply VCC.

[0025] A capacitor C8 is connected between pins 8 and 9 of chip U2. Pin 10 of chip U2 is connected to a 24V DC power supply through capacitor C6. Pin 26 of chip U2 is grounded through capacitor C9. Pin 11 of chip U2 is grounded through capacitor C7. Pin 22 of chip U2 is connected to signal DI3, which is the direction input signal output by the main controller. Pin 23 of chip U2 is left floating. Pin 19 of chip U2 is connected to pin 4 of chip U4, and pin 20 of chip U2 is connected to pin 3 of chip U4.

[0026] Combination Figure 3 Sensor U12 is a weft yarn detection sensor. Pin 1 of sensor U12 is the power ground terminal, pin 4 of sensor U12 is the power input terminal, which is connected to a 24V DC power supply, pin 2 of sensor U12 is the sensitivity voltage input terminal, and pin 3 is the detection signal output terminal.

[0027] Pin 3 of sensor U12 is connected to one end of resistors R9 to R11. The other end of resistor R9 is grounded. The other end of resistor R10 is connected to the inverting input of integrated operational amplifier U4 and one end of capacitor C13. The other end of capacitor C13 is grounded. The other end of resistor R11 is connected to the output of integrated operational amplifier U4 and one end of resistor R12. The other end of resistor R12 is connected to one end of capacitor C14, the non-inverting input of integrated operational amplifier U5, and the inverting input of integrated operational amplifier U6.

[0028] A potentiometer W1 and resistors R29 to R32 are connected in series between the 24V DC power supply and the ground terminal. The non-inverting input of integrated operational amplifier U4 is connected between resistors R30 and R31, the inverting input of integrated operational amplifier U5 is connected between resistors R31 and R32, and the non-inverting input of integrated operational amplifier U6 is connected between resistors R29 and R30.

[0029] The output of integrated operational amplifier U5 is connected to pin 2 of optocoupler chip U7 via series resistor R13. A 24V DC power supply is connected to pin 1 of optocoupler chip U7 via series LED D3. A 3.3V DC power supply is connected to pin 4 of optocoupler chip U7 via series resistor R15. Pin 3 of optocoupler chip U7 is grounded. Pin 4 of optocoupler chip U7 also outputs signal DO1, which is connected to the input of the main controller. The output of integrated operational amplifier U6 is connected to pin 2 of optocoupler chip U8 via series resistor R14. A 24V DC power supply is connected to pin 1 of optocoupler chip U8 via series LED D4. A 3.3V DC power supply is connected to pin 4 of optocoupler chip U8 via series resistor R16. Pin 3 of optocoupler chip U8 is grounded. Pin 4 of optocoupler chip U8 also outputs signal DO2, which is connected to the input of the main controller.

[0030] The aforementioned sensor driving module is used to change the sensitivity of the weft yarn detection sensor. It is implemented by optical coupler chips U10~U11. Optical coupler chip U10 and the aforementioned optical coupler chips U7~U8 are implemented using integrated chip of model TLP181, and optical coupler chip U11 is implemented using integrated chip of model TLP281-4.

[0031] A 3.3V DC power supply is simultaneously connected to pin 1 of optocoupler chip U10 and pins 1, 3, 5, and 7 of optocoupler chip U11. Signal DI8, output by the autonomous controller, is connected to pin 2 of optocoupler chip U10 via series resistor R19; signal DI9, output by the autonomous controller, is connected to pin 2 of optocoupler chip U11 via series resistor R20; signal DI10, output by the autonomous controller, is connected to pin 4 of optocoupler chip U11 via series resistor R21; signal DI11, output by the autonomous controller, is connected to pin 6 of optocoupler chip U11 via series resistor R22; and signal DI12, output by the autonomous controller, is connected to pin 8 of optocoupler chip U11 via series resistor R23.

[0032] A 24V DC power supply is simultaneously connected to pin 4 of optocoupler chip U10 and pins 16, 14, and 12 of optocoupler chip U11. Pin 3 of optocoupler chip U10 is connected in series with resistor R24 ​​to the non-inverting input of operational amplifier U9. Pin 15 of optocoupler chip U11 is connected in series with resistor R25 to the non-inverting input of operational amplifier U9. Pin 13 of optocoupler chip U11 is connected in series with resistor R26 to the non-inverting input of operational amplifier U9. Pin 11 of optocoupler chip U11 is connected in series with resistor R27 to the non-inverting input of operational amplifier U9. Pin 10 of optocoupler chip U11 is connected in series with resistor R28 to the non-inverting input of operational amplifier U9. Pin 9 of optocoupler chip U11 is grounded.

[0033] The inverting input of the integrated operational amplifier U9 is connected to its output and one end of the resistor R18. The other end of the resistor R18 is connected to one end of the resistor R17 and the diode D5. The anode of the diode D5 and the other end of the resistor R17 are connected to pin 2 (sensitivity voltage input) of the sensor U12.

[0034] The specific working process and working principle are as follows: The operating current reference signal DI5 and the standby current reference signal DI6 output by the autonomous controller are respectively connected to integrated chips U3~U4. At the same time, the main controller controls the output of integrated chips U3~U4. According to the weaving process of the fabric, any weft selection motor is selected for weft selection or operation. Taking the weft selection motor connected to terminal J1 as an example: when the weft selection motor needs to perform weft selection, the main controller controls the contact in integrated chip U3 to switch to pin 7. At this time, the operating current reference signal DI5 output by the main controller is output to chip U1 (motor drive module) through chip U3. Then, the main controller controls chip U1 to output the operating current corresponding to the operating current reference signal DI5 through pin 25 to the weft selection motor connected to pin 1 of terminal J1 to drive the weft selection motor to work. Similarly, when the weft selection motor needs to be in standby mode, the main controller sends the standby current reference signal DI6 to chip U1 through the control chip U3. Chip U1 sends the corresponding current to the weft selection motor according to the standby current reference signal DI6, so that the weft selection motor is in standby mode (locked state).

[0035] When the loom is working, the weft yarn needs to be detected by the weft yarn detection sensor. At this time, the signal output by the main controller (signals D8~D12) controls the optocouplers in the optocoupler chips U10~U11 to be in different conduction states, and further realizes the series and parallel connection of resistors, which can ultimately achieve 16 levels of output voltage to adjust the sensitivity of the weft yarn detection sensor (sensor U12). The weft yarn detection sensor is used to determine whether the weft yarn signal is broken, single weft, double weft, or multiple wefts.

[0036] The signal output by the weft detection sensor is amplified by an integrated operational amplifier circuit composed of U4~U5 and a comparator circuit to realize the conduction state of the optocouplers in the optocoupler chips U7~U8, and further realize the level state of the output signals DO1~DO2. Through the level state of the output signals DO1~DO2, four different level signals (00, 01, 10, 11) can be output to the main controller to facilitate the main controller to judge the weft status during the operation of the loom.

[0037] As can be seen from the above, in the weft selection mechanism control system of the rapier loom of this application, by using a set of signal switching modules and motor drive modules in combination, it is possible to output working current or standby current signals to multiple weft selection motors, realize separate control of the current of the weft selection machine in standby and running, reduce motor heating, improve port utilization, and reduce the difficulty of main control board layout.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A weft selection mechanism control system for a rapier loom, comprising multiple weft selection motors, wherein a main controller within the rapier loom is connected to the weft selection motors, characterized in that: include: The signal switching module is connected to the input of the main controller. The signal switching module is used to receive the working current reference signal and the standby current reference signal output by the main controller. The output of the motor drive module and the signal switching module are connected to the input of the motor drive module. The motor drive module is used to receive the working current reference signal or the standby current reference signal output by the main controller. The power output of the motor drive module is connected to multiple weft-selective motors.

2. The weft selection mechanism control system for a rapier loom according to claim 1, characterized in that: A weft yarn detection sensor is connected to the signal input terminal of the main controller. The sensor driver module is connected to the sensitivity voltage input terminal of the weft yarn detection sensor. The signal output terminal of the main controller is connected to the input terminal of the sensor driver module.

3. The weft selection mechanism control system for a rapier loom according to claim 2, characterized in that: The signal output by the weft yarn detection sensor is connected to the signal input terminal of the main controller after passing through an amplifier circuit and a comparator circuit.

4. The weft selection mechanism control system for a rapier loom according to claim 1, characterized in that: Each signal switching module corresponds to a motor drive module, and multiple signal switching modules and multiple motor drive modules are provided for each module.

5. The weft selection mechanism control system for a rapier loom according to claim 1, characterized in that: The signal switching module is implemented using a double-pole double-throw switch chip.

6. The weft selection mechanism control system for a rapier loom according to claim 5, characterized in that: The signal switching module uses chip U3 of model FSUSB42. Pin 1 of chip U3 is connected to one end of capacitor C5, and the other end of capacitor C5 is connected to the other end of chip U3. Pins 5 and 10 of chip U3 are grounded. The chip selection signal DI2 output by the autonomous controller is connected to pin 2 of chip U3. Pins 3 and 4 of chip U3 are connected to the motor drive module. The operating current reference signal DI5 is connected to pin 9 of chip U3. The standby current reference signal DI6 is connected to pin 7 of chip U3. The pulse input signal DI7 output by the autonomous controller is connected to pin 8 of chip U3. Pin 2 of chip U3 is also connected to one end of resistor R4. The other end of resistor R4 is connected to the anode of photodiode D1. The cathode of photodiode D1 is grounded.

7. The weft selection mechanism control system for a rapier loom according to claim 2, characterized in that: The sensor driving module includes optocoupler chips U10~U11. A 3.3V DC power supply is connected to pin 1 of optocoupler chip U10 and pins 1, 3, 5 and 7 of optocoupler chip U11. The signal DI8 output by the autonomous controller is connected to pin 2 of optocoupler chip U10 after series resistor R19. The signal DI9 output by the autonomous controller is connected to pin 2 of optocoupler chip U11 after series resistor R20. The signal DI10 output by the autonomous controller is connected to pin 4 of optocoupler chip U11 after series resistor R21. The signal DI11 output by the autonomous controller is connected to pin 6 of optocoupler chip U11 after series resistor R22. The signal DI12 output by the autonomous controller is connected to pin 8 of optocoupler chip U11 after series resistor R23. A 24V DC power supply is simultaneously connected to pin 4 of optocoupler chip U10 and pins 16, 14, and 12 of optocoupler chip U11. Pin 3 of optocoupler chip U10 is connected in series with resistor R24 ​​to the non-inverting input of integrated operational amplifier U9. Pin 15 of optocoupler chip U11 is connected in series with resistor R25 to the non-inverting input of integrated operational amplifier U9. Pin 13 of optocoupler chip U11 is connected in series with resistor R26 to the non-inverting input of integrated operational amplifier U9. Pin 11 of optocoupler chip U11 is connected in series with resistor R27 to the non-inverting input of integrated operational amplifier U9. Pin 10 of optocoupler chip U11 is connected in series with resistor R28 to the non-inverting input of integrated operational amplifier U9. Pin 9 of optocoupler chip U11 is grounded. The inverting input of the integrated operational amplifier U9 is connected to its output and one end of resistor R18. The other end of resistor R18 is connected to one end of resistor R17 and the diode D5. The anode of diode D5 and the other end of resistor R17 are connected to the sensitivity voltage input of the weft yarn detection sensor.

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