A signal strength display device and method, and weft feeler

Abstract

The present invention provides a display device and method for signal strength, and a weft feeler, comprising: resetting a first signal detection unit and a second signal detection unit at the beginning of detection; when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the first preset pulse width, the first signal detection unit outputs a valid first strength indication signal; when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the second preset pulse width, the second signal detection unit outputs a valid second strength indication signal; a signal strength indication module controls the indicator light corresponding to the strength of the signal to be detected to light up at the end of detection according to the first strength indication signal and the second strength indication signal. The present invention is applied to the field of textile weft detection, provides a display of weft signal strength, can effectively guide the adjustment of the sampling sensitivity of the weft signal, improves the accuracy and efficiency of the adjustment, and thus improves the accuracy of the weft detection sensitivity.

Description

Technical Field

[0001] The present invention relates to the technical field of signal processing, and in particular to a device and method for displaying signal strength, and a weft feeler. Background Art

[0002] Weft feeler technology is the core technology of the electronic control system of textile machinery. Its performance directly affects the working efficiency of the textile machinery and the quality of the fabric. The weft feeler is used to realize the weft feeler technology.

[0003] Traditional weft feelers, such as Figure 7 As shown, it includes a weft signal detection and processing circuit, a weft detection processing circuit, a weft detection interval adjustment circuit, a digital tube display, etc.

[0004] When the loom runs to a certain angle, the main control sends out a detection interval signal P1, which is used to detect the weft yarn in the specified detection interval. The detection interval signal passes through the weft detection interval adjustment circuit to obtain the adjusted interval signal P2, which is output to the weft detection processing circuit. The weft detection interval adjustment circuit usually includes phase shift adjustment and width adjustment.

[0005] When the loom runs to a certain angle, it does the weft insertion movement. After the probe detects the original weft signal, it is transmitted to the weft signal detection and processing circuit for filtering and amplification processing to form a pulse weft signal SIN, and the SIN signal is output to the weft detection processing circuit.

[0006] In the weft detection processing circuit, after logical analysis and comparison, if the SIN signal is included in the P2 signal, the weft signal is detected in the detection interval, it is considered that there is yarn, and the main control is notified to control the loom to continue operating; if there is no SIN signal, or the SIN signal is not included in the P2 signal, the weft signal is not detected in the weft detection interval, it is considered that no yarn has entered the loom or there is a yarn breakage, and the main control is notified to stop the loom.

[0007] The phase relationship between the SIN signal and the P2 signal is displayed through the digital tube display circuit. Specifically, the P2 signal is divided into 5 equal parts, and the different positions of the SIN signal within the 5 segments of 0-1, 1-2, 2-3, 3-4, and 4-5 are represented by 0, 1, 2, 3, and 4 respectively, and when the SIN signal is outside 0-5 or there is no SIN signal, it is represented by the number 5. When the digital tube displays 0-4, it means that the weft signal is detected in the detection interval and the loom does not stop; when it displays 5, it means that the weft signal is not detected in the detection interval and the loom needs to stop immediately.

[0008] According to the displayed results, the phase and width of the P2 signal are adjusted so that SIN is included in P2, thereby achieving the adjustment of the weft detection sensitivity.

[0009] The above is the adjustment of the traditional weft feeler sensitivity.

[0010] When the SIN signal is too weak, no matter how the P2 signal is adjusted, the ideal weft detection sensitivity cannot be achieved. The strength of the SIN signal is related to the sampling sensitivity of the weft signal detection and processing circuit. Low sampling sensitivity can easily lead to weak SIN signal strength, and too high sampling sensitivity can easily take interference signals as weft signals. Therefore, it is necessary to adjust the sampling sensitivity of the weft signal to an appropriate position.

[0011] The traditional display method does not show the strength of the weft signal, so it cannot guide the adjustment of the sampling sensitivity of the weft signal. The adjustment of the sampling sensitivity in the prior art is relatively blind. If the adjustment is not good, it will affect the accuracy of the weft detection of the loom, thereby seriously affecting the working efficiency of the loom and the quality of the fabric. Summary of the invention

[0012] The purpose of the present invention is to overcome at least some of the deficiencies in the prior art and to provide a device and method for displaying signal strength and a weft feeler.

[0013] The technical solution provided by the present invention is as follows:

[0014] A signal strength display device comprises: a signal detection module and a signal strength indication module, wherein the signal detection module and the signal strength indication module are connected; the signal detection module comprises a first signal detection unit and a second signal detection unit; at the beginning of detection, the first signal detection unit and the second signal detection unit are reset; when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the first preset pulse width, the first signal detection unit outputs a valid first strength indication signal; when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the second preset pulse width, the second signal detection unit outputs a valid second strength indication signal; the second preset pulse width is greater than the first preset pulse width; the signal strength indication module controls the indicator light corresponding to the strength of the signal to be detected to light up according to the first strength indication signal and the second strength indication signal at the end of detection.

[0015] Furthermore, each signal detection unit includes an RC filter circuit and a D trigger, and the output end of the RC filter circuit is connected to the edge trigger end of the D trigger; the preset pulse width of each signal detection unit is calculated according to the time constant of the corresponding RC filter circuit.

[0016] Furthermore, the set terminal of the D flip-flop is connected to a power supply, and the data terminal is connected to a power supply.

[0017] Furthermore, the RC filter circuit includes: a sixth resistor, a first capacitor, a first inverter, a sixth diode and a seventh resistor; one end of the sixth resistor is respectively connected to the input end of the first inverter, one end of the first capacitor and the positive electrode of the sixth diode; the other end of the sixth resistor is connected to one end of the seventh resistor; the other end of the first capacitor is grounded; and the cathode of the sixth diode is connected to the other end of the seventh resistor.

[0018] Furthermore, the output end of the RC filter circuit is connected to the edge trigger end of the D trigger through an eighth resistor, the connection point of the eighth resistor and the D trigger is respectively connected to the positive electrode of the seventh diode and one end of the ninth resistor, the negative electrode of the seventh diode is connected to the power supply, and the other end of the ninth resistor is grounded.

[0019] Further, the output end of the first signal detection unit includes a positive phase output end and a negative phase output end; the output end of the second signal detection unit includes a positive phase output end and a negative phase output end; the signal strength indication module includes: a first resistor, a second resistor, a third resistor, a first indicator light, a second indicator light and a third indicator light; the cathode of the first indicator light, the cathode of the second indicator light and the cathode of the third indicator light are connected; the anode of the first indicator light is connected to the negative phase output end of the first signal detection unit through the first resistor; the anode of the second indicator light is connected to the positive phase output end of the first signal detection unit through the second resistor; the anode of the third indicator light is connected to the positive phase output end of the second signal detection unit through the third resistor.

[0020] Furthermore, the signal detection module also includes a third signal detection unit and a fourth signal detection unit; at the beginning of detection, the first signal detection unit, the second signal detection unit, the third signal detection unit and the fourth signal detection unit are reset; when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the third preset pulse width, the third signal detection unit outputs a valid third strength indication signal; the third preset pulse width is greater than the second preset pulse width; when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the fourth preset pulse width, the fourth signal detection unit outputs a valid fourth strength indication signal; the fourth preset pulse width is greater than the third preset pulse width; the signal strength indication module, according to the first strength indication signal, the second strength indication signal, the third strength indication signal and the fourth strength indication signal, at the end of detection, controls the indicator light corresponding to the strength of the signal to be detected to light up.

[0021] Further, the output end of the first signal detection unit, the output end of the second signal detection unit, the output end of the third signal detection unit and the output end of the fourth signal detection unit respectively include a positive output end and an inverting output end; the signal strength indication module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first indicator light, a second indicator light, a third indicator light, a fourth indicator light, a fifth indicator light, a first diode, a second diode, a third diode and a fourth diode; the cathode of the first indicator light, the cathode of the second indicator light, the cathode of the third indicator light, the cathode of the fourth indicator light and the cathode of the fifth indicator light are connected; the anode of the first indicator light is connected to the inverting output end of the first signal detection unit through the first resistor, and is also connected to the anode of the first diode; the cathode of the second indicator light The positive electrode of the indicator light is connected to the positive phase output end of the first signal detection unit through the second resistor, and is also connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the negative phase output end of the second signal detection unit; the positive electrode of the third indicator light is connected to the positive phase output end of the second signal detection unit through the third resistor, and is also connected to the positive electrode of the third diode, and the negative electrode of the third diode is connected to the negative phase output end of the third signal detection unit; the positive electrode of the fourth indicator light is connected to the positive phase output end of the third signal detection unit through the fourth resistor, and is also connected to the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected to the negative phase output end of the fourth signal detection unit; the positive electrode of the fifth indicator light is connected to the positive phase output end of the fourth signal detection unit through the fifth resistor.

[0022] The present invention also provides a weft feeler, comprising the aforementioned signal strength display device.

[0023] The present invention also provides a method for displaying signal strength, comprising: at the beginning of detection, initializing a first strength indication signal and a second strength indication signal; when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the first preset pulse width, outputting a valid first strength indication signal; when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the second preset pulse width, outputting a valid second strength indication signal; the second preset pulse width is greater than the first preset pulse width; and according to the first strength indication signal and the second strength indication signal, at the end of detection, controlling the indicator light corresponding to the strength of the signal to be detected to light up.

[0024] The signal strength display device, method and weft feeler provided by the present invention can bring the following beneficial effects: by introducing the display of the signal strength to be detected, the adjustment of the sampling sensitivity of the signal to be detected can be effectively guided, thereby improving the accuracy and efficiency of the adjustment; by applying the present invention to the weft feeling technology, by introducing the display of the weft signal strength, the adjustment of the sampling sensitivity of the weft signal can be effectively guided, thereby improving the accuracy and efficiency of the adjustment, and effectively improving the machine adjustment efficiency and startup efficiency of the water jet loom. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following will explain the preferred implementation mode in a clear and understandable manner with reference to the accompanying drawings, and further explain the above-mentioned characteristics, technical features, advantages and implementation methods of a signal strength display device and method, and a weft feeler.

[0026] Figure 1 is a structural diagram of an embodiment of a signal strength display device of the present invention;

[0027] Figure 2 is a structural diagram of another embodiment of a signal strength display device of the present invention;

[0028] Figure 3 yes Figure 2 A circuit diagram of a signal detection unit;

[0029] Figure 4 yes Figure 2 A circuit diagram of a signal strength indicator module;

[0030] Figure 5 yes Figure 2 A signal waveform diagram in the device shown;

[0031] Figure 6 It is a structural schematic diagram of an embodiment of a weft feeler of the present invention;

[0032] Figure 7 It is a structural diagram of a traditional weft feeler;

[0033] Figure 8 It is a flow chart of an embodiment of a method for displaying signal strength of the present invention.

[0034] Description of Figure Numbers:

[0035] 10. Signal detection module, 11. First signal detection unit, 12. Second signal detection unit, 13. Third signal detection unit, 14. Fourth signal detection unit, 20. Signal strength indication module, 100. RC filter circuit, 110. D trigger, 2. Signal strength display device, 1. Weft feeler. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0037] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one". In addition, the "high level" that appears in the present invention is VCC; the "low level" is "ground", GND.

[0038] In one embodiment of the present invention, Figure 1 As shown, a signal strength display device 2 includes:

[0039] The signal detection module 10 and the signal strength indication module 20 are connected.

[0040] The signal detection module 10 detects the strength of the signal to be detected in the detection interval, and after the detection is completed, the detection result is displayed through the signal strength indication module 20.

[0041] The signal detection module 10 includes a first signal detection unit 11 and a second signal detection unit 12 .

[0042] The signal to be detected, the reset signal Clr and the detection interval signal P1 are processed by the first signal detection unit 11 to obtain the first strength indication signal Q1; the signal to be detected, the reset signal Clr and the detection interval signal P1 are processed by the second signal detection unit 12 to obtain the second strength indication signal Q2.

[0043] At the beginning of detection, the first signal detection unit and the second signal detection unit are temporarily reset, and an invalid first strength indication signal and an invalid second strength indication signal are output, that is, the level of the signal Q1 / Q2 is an invalid level. For example, when the rising edge of the detection interval signal P1 arrives, the reset signal Clr is temporarily valid, and the signal resets each signal detection unit.

[0044] The invalid level can be set to a low level or a high level according to actual needs. If the invalid level is a low level, the valid level is a low level, and there is no restriction here.

[0045] When it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the first preset pulse width, the first signal detection unit 11 outputs a valid first strength indication signal Q1.

[0046] When it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the second preset pulse width, the second signal detection unit 12 outputs a valid second strength indication signal Q2; the second preset pulse width is greater than the first preset pulse width.

[0047] Specifically, each signal detection unit has the same circuit structure, including an RC filter circuit and a D flip-flop, and the output end of the RC filter circuit is connected to the edge trigger end (CLK) of the D flip-flop. However, the time constant of the RC filter circuit of each signal detection unit is different.

[0048] The set terminal (SD) of the D flip-flop is connected to the power supply, or connected to the power supply through a resistor; the data terminal (D) is connected to the power supply, or connected to the power supply through a resistor; and the reset terminal (CD) is connected to the reset signal Clr.

[0049] The usage of D flip-flop is as follows (H represents high level, L represents low level):

[0050] CD side SD terminal CLK terminal D-side Q-end / Q terminal H H ↑ H H L L H X H L H

[0051] Every time a trigger pulse comes, if the CD end (reset end) is at a high level, the Q end is at a high level; if the CD end is at a low level, the Q end is at a low level regardless of whether CLK is present or not.

[0052] The RC filter circuit can be composed of a traditional RC circuit and an inverter, or it can be composed of an RC circuit and a comparator. The input signal is converted into a drop signal through the charging and discharging process of the RC circuit. Taking discharge as an example, when the drop signal drops to the flip threshold of the inverter, the inverter is triggered to flip and a rising edge is generated; this rising edge then triggers the positive output terminal (Q) of the D flip-flop to change. If the drop signal drops to a limited level and does not trigger the inverter to flip, no edge signal is generated, and the Q terminal of the D flip-flop maintains its original state.

[0053] The time required for the signal to decay from its maximum value to the inverter's flip threshold is defined as the preset pulse width. According to the output level of the Q terminal of the D flip-flop, it can be known whether the pulse width of the input signal is greater than the preset pulse width. Therefore, the signal detection unit composed of the RC filter circuit and the D flip-flop can realize the comparison between the effective pulse width of the signal to be detected and the preset pulse width.

[0054] The time constant of the RC circuit affects how quickly the drop signal decays. The larger the time constant, the slower the RC circuit discharges. The time constant refers to the time required for the signal to decay from its maximum value to 1 / e of the maximum value.

[0055] Assuming that the inverter's flip threshold is limited to 0.5VCC, the time required for the signal to decay from the maximum value (=VCC) to the inverter's flip threshold (i.e., the preset pulse width) is equal to t=ln2·τ, where τ is the time constant of the RC filter circuit. If the time constant of the RC filter circuit is different, the corresponding preset pulse width is also different.

[0056] Using this point, signal detection units with different time constants are designed, and the signal to be detected is input into multiple signal detection units at the same time. The effective pulse width is compared with multiple different preset pulse widths respectively, and the interval in which the strength of the signal to be detected falls can be determined based on the comparison results.

[0057] To this end, the time constants of the RC filter circuits included in different signal detection units are set to be different, and different resistors and capacitors can be used to achieve this. The preset pulse width of each signal detection unit is calculated based on the time constant of the corresponding RC filter circuit. That is, the time constant of the first RC filter circuit included in the first signal detection unit corresponds to the first preset pulse width, and the time constant of the second RC filter circuit included in the second signal detection unit corresponds to the second preset pulse width.

[0058] When the detection interval signal P1 arrives, the reset signal Clr is valid, each signal detection unit is reset, Q1 and Q2 are invalid, and both are at a low level. In this way, each detection is reset first to ensure that the strength of the signal to be detected in the detection interval is detected each time.

[0059] When the effective pulse width of the signal to be detected in the detection interval is greater than the first preset pulse width, the filter signal output by the first RC filter circuit jumps and generates a rising edge; the rising edge triggers the D flip-flop to output a high-level Q1 signal.

[0060] When the effective pulse width of the signal to be detected in the detection interval is less than the first preset pulse width, the filtered signal output by the first RC filter circuit does not jump, so the signal Q1 maintains the original level, that is, the low level.

[0061] Therefore, the first signal detection unit can determine whether the intensity of the signal to be detected within the detection interval is greater than the first preset pulse width.

[0062] Similarly, the second signal detection unit can determine whether the intensity of the signal to be detected within the detection interval is greater than the second preset pulse width.

[0063] The first preset pulse width is equivalent to the first strength threshold of the signal to be detected; the second preset pulse width is equivalent to the second strength threshold of the signal to be detected. The second strength threshold is greater than the first strength threshold. The second strength threshold and the first strength threshold divide the strength of the signal to be detected into three categories: less than the first strength threshold, between the first strength threshold and the second strength threshold, and greater than the second strength threshold, which can be simply recorded as weak, medium, and strong.

[0064] The signal strength indication module controls the indicator light corresponding to the strength of the signal to be detected to light up according to the first strength indication signal and the second strength indication signal when the detection is finished.

[0065] As shown in the following table, the combination of the first strength indication signal Q1 and the second strength indication signal Q2 indicates the strength of the signal to be detected, and the corresponding indicator light is controlled according to the strength. There are many display methods, as long as they can distinguish the strength of the signal to be detected. The following table lists two for reference.

[0066]

[0067] Optionally, the output end of the first signal detection unit includes a positive phase output end and a negative phase output end; the output end of the second signal detection unit includes a positive phase output end and a negative phase output end; the signal strength indication module includes: a first resistor, a second resistor, a third resistor, a first indicator light, a second indicator light, a third indicator light and a second diode.

[0068] The cathodes of the first indicator light, the second indicator light and the third indicator light are connected; the connection point can be connected to the detection interval signal P1, so that the detection interval is at a high level, which can ensure that all indicator lights are not lit in the detection interval, and the corresponding indicator lights are lit according to the detection results after the detection is completed.

[0069] The positive electrode of the first indicator light is connected to the inverting output end of the first signal detection unit through the first resistor;

[0070] The positive electrode of the second indicator light is connected to the positive phase output terminal of the first signal detection unit through the second resistor, and is also connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the negative phase output terminal of the second signal detection unit. Through the clamping function of the second diode, when the positive phase output terminal of the second signal detection unit is at a high level (correspondingly, the negative phase output terminal is at a low level), the second indicator light will not light up.

[0071] The positive electrode of the third indicator light is connected to the positive phase output end of the second signal detection unit through the third resistor.

[0072] The above circuit structure realizes display mode 1 in the above table. If the "second diode" is eliminated, display mode 2 in the above table can be realized.

[0073] If it is necessary to make a more detailed classification of the strength of the detection signal, the signal detection unit and the indicator light can be added according to the actual needs, and there is no restriction here. For example, 3 signal detection units and 4 indicator lights, or more than 3 signal detection units and more than 4 indicator lights, each signal detection unit corresponds to a different preset pulse width, and the intensity of the detection signal can be more finely classified through the multi-channel signal detection unit, and the corresponding classification display is performed through the multi-channel indicator light.

[0074] In this embodiment, by introducing the display of the strength of the signal to be detected, the adjustment of the sampling sensitivity of the signal to be detected can be effectively guided, thereby improving the accuracy and efficiency of the adjustment.

[0075] Another embodiment of the present invention, as Figure 2 , Figure 3 , Figure 4 As shown, a signal strength display device is used for displaying the strength of weft yarn signals in the field of weft detection in textiles, comprising:

[0076] The signal detection module 10 and the signal strength indication module 20 , the output end of the signal detection module 10 is connected to the signal strength indication module 20 .

[0077] The signal to be detected is a weft yarn signal. The signal detection module 10 detects the strength of the weft yarn signal in the detection interval, and the detection result is displayed by the signal strength indication module 20 after the detection is completed.

[0078] The signal detection module 10 comprises a first signal detection unit 11, a second signal detection unit 12, a third signal detection unit 13 and a fourth signal detection unit 14. Each signal detection unit comprises two output terminals, namely a positive phase output terminal and a negative phase output terminal.

[0079] The circuit structure of each signal detection unit is basically the same, such as Figure 3 As shown, both include an RC filter circuit 100 and a D flip-flop 110. The structures of the RC filter circuits 100 are basically the same, including: a sixth resistor R6, a first capacitor C1, a first inverter F1, a sixth diode D6 and a seventh resistor R7; one end of the resistor R6 is respectively connected to the input end of the first inverter F1, one end of the capacitor C1 and the positive electrode of the diode D6; the other end of the resistor R6 is connected to one end of the resistor R7; the other end of the capacitor C1 is grounded; and the cathode of the diode D6 is connected to the other end of the resistor R7.

[0080] The difference between the RC filter circuit and the traditional RC filter circuit is that a diode D6 and a resistor R7 are added. The function of this branch is to speed up the discharge speed of the capacitor C1.

[0081] The preset pulse width of each signal detection unit is calculated based on the time constant of the corresponding RC filter circuit;

[0082] The output end of the RC filter circuit is connected to the edge trigger end (CLK) of the D flip-flop. The set end (SD) of the D flip-flop is connected to the power supply, the data end (D) is connected to the power supply, and the reset end (CD) is connected to the reset signal Clr.

[0083] When the reset signal Clr is valid, the output Q terminal becomes low level and the / Q terminal becomes high level. When the edge trigger terminal receives a rising edge, the output Q terminal becomes high level and the / Q terminal becomes low level.

[0084] Optionally, an eighth resistor R8, a ninth resistor R9 and a seventh diode D7 are added between the RC filter circuit and the D trigger to perform signal pull-down and signal matching. The output end of the RC filter circuit is connected to the edge trigger end (CLK) of the D trigger through the resistor R8, the connection point of the resistor R8 and the D trigger is respectively connected to the positive electrode of the diode D7 and one end of the resistor R9, the negative electrode of the diode D7 is connected to the power supply, and the other end of the resistor R9 is grounded.

[0085] The difference between different signal detection units is that the resistance and capacitance values ​​included in the RC filter circuit are different, so that the time constant of the RC filter circuit is different. The preset pulse width of each signal detection unit is calculated according to the time constant of the corresponding RC filter circuit.

[0086] When the weft yarn signal is processed by different signal detection units at the same time, the weft yarn signal strength can be judged in different intervals, and the interval in which the weft yarn signal strength is located can be determined according to the output results of each signal detection unit.

[0087] The output results of each signal detection unit (Q1 to Q4 signals, / Q1 to / Q4 signals) are input into the signal strength indication module. The signal strength indication module controls the indicator light corresponding to the strength of the weft yarn signal.

[0088] like Figure 4 As shown, the signal strength indication module includes:

[0089] The first resistor R1 to the fifth resistor R5, the first indicator light LED1 to the fifth indicator light LED5, and the first diode D1 to the fifth diode D5.

[0090] The cathodes of LED1, LED2, LED3, LED4 and LED5 are connected, and the connection point is connected to the anode of diode D5, and the cathode of diode D5 inputs window signal P_D. Diode D5 may not be selected, and the absence of diode D5 does not affect the function of the signal strength indication module.

[0091] The anode of the indicator LED1 is connected to the inverting output terminal ( / Q terminal) of the first signal detection unit through the resistor R1, and is also connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the reset signal Clr.

[0092] The anode of indicator LED2 is connected to the positive phase output terminal (Q terminal) of the first signal detection unit through resistor R2, and is also connected to the anode of diode D2, and the cathode of diode D2 is connected to the negative phase output terminal of the second signal detection unit.

[0093] The anode of indicator LED3 is connected to the positive phase output terminal of the second signal detection unit through resistor R3, and is also connected to the anode of diode D3, and the cathode of diode D3 is connected to the negative phase output terminal of the third signal detection unit.

[0094] The anode of indicator LED4 is connected to the positive phase output terminal of the third signal detection unit through resistor R4, and is also connected to the anode of diode D4, and the cathode of diode D4 is connected to the negative phase output terminal of the fourth signal detection unit.

[0095] The positive electrode of the indicator light LED5 is connected to the positive phase output end of the fourth signal detection unit through the resistor R5.

[0096] Different indicator lights can be set to different colors, for example, LED1 is a red indicator light, LED2 to LED4 are green indicators, and LED5 is a red indicator light. It is not good for the strength of the weft signal to be too strong or too weak. Setting red is easy to attract the attention of the machine adjustment personnel. The five indicator lights can be arranged in sequence. When the adjusted weft signal jumps in the three green lights, it means that the weft signal strength is adjusted appropriately.

[0097] The working principle of the display device 2 is introduced as follows: Figure 5 As shown:

[0098] When the detection interval signal P1 arrives, the reset signal Clr is valid, and this signal resets the D flip-flops of the signal detection units of each channel, so that the positive phase output terminal signals Q1 to Q4 become low level.

[0099] The weft signal SIN is a high-frequency signal, which is actually a group of weak pulses. Figure 5 is an example. The detection interval corresponds to the positive pulse width of signal P1, Figure 5 It is assumed that the corresponding angle range is 280°~350°.

[0100] Each detection unit detects the effective pulse width of the weft signal SIN in the detection interval through an RC filter circuit. In this embodiment, the negative pulse is taken as the effective pulse, and the sum of the negative pulse widths of SIN in the detection interval is the effective pulse width. In other application scenarios, the positive pulse can also be taken as the effective pulse.

[0101] If the effective pulse width of the weft signal SIN is less than the first preset pulse width, it means that the falling amplitude of the drop signal does not reach the flip threshold of the inverter in the first RC filter circuit, and the inverter cannot be triggered to flip, that is, no CLK signal is generated, and the signal Q1 maintains a low level. Since the time constants of the first signal detection unit to the fourth signal detection unit are successively larger, in this case, the positive phase output terminals of other detection units are all low levels.

[0102] When the effective pulse width of the weft signal SIN is greater than the first preset pulse width and less than other preset pulse widths, the CLK1 signal is valid, making the signal Q1 high level; other CLK signals are low level, so Q2-Q4 maintain low level.

[0103] When the effective pulse width of the weft signal SIN is greater than the second preset pulse width and less than the third and fourth preset pulse widths, the CLK1 and CLK2 signals are valid, making the signals Q1 and Q2 high level; the CLK3 and CLK4 signals are invalid, and Q3-Q4 maintain low level. Figure 5 This is the situation presented.

[0104] When the weft signal SIN is greater than the third preset pulse width and less than the fourth preset pulse width, the CLK1, CLK2, and CLK3 signals are valid, making the signals Q1, Q2, and Q3 high level; the CLK4 signal is invalid, and Q4 maintains a low level. And so on.

[0105] Display mode: There are 5 indicator lights (LED1~LED5), all of which are off in the detection interval. At the end of the detection interval, the corresponding indicator lights are controlled to light up according to the measured weft signal strength. When the weft signal is weak, LED1 lights up, when the weft signal is strong, one of LED2~LED4 lights up, and when the weft signal is the strongest, LED5 lights up. Only one indicator light is on each time, so you can intuitively understand the strength of the captured weft signal at this time.

[0106] The negative poles of all indicator lights are connected to the window signal P_D, so the indicator lights up only when the window signal P_D is at a low level.

[0107] Window signal P_D, such as Figure 5 As shown, when the reset signal Clr is valid, it is at a low level, and when the reset signal Clr is invalid in the detection interval, it is at a high level. The window signal P_D is obtained according to the reset signal Clr and the detection interval signal P1, for example, by performing an XOR operation on the reset signal Clr and the detection interval signal P1.

[0108] Connecting the negative pole of the indicator light to the window signal P_D can ensure that most of the indicator lights are off in the detection interval, thereby preventing the indicator lights from flashing randomly during the detection period. Among them, since LED1 is driven to light up by / Q1, when the reset signal is valid in the detection interval, / Q1 will become a high level. In order to not light up LED1 at this time, a first diode D1 is added. Through the clamping of diode D1, the current flows to diode D1 through resistor R1, and does not flow to LED1.

[0109] When signals Q1 to Q4 are all low, it indicates that the weft signal strength is at the first level. At this time, / Q1 is high, LED1 is lit; signals Q1 to Q4 are all low, LED2 to LED5 are off; so only LED1 is on.

[0110] When signal Q1 is high and Q2~Q4 are all low, it indicates that the weft signal strength is in the second gear. At this time, / Q1 is low, LED1 is off; Q1 is high, driving LED2 to light up; Q2~Q4 are all low, LED3~LED5 are off; so only LED2 is on.

[0111] When signals Q1 and Q2 are both high and Q3-Q4 are all low, it indicates that the weft signal strength is at the third level. At this time, / Q1 is low, LED1 is off; Q1 is high, / Q2 is low, through the clamping of diode D2, the current flows from resistor R2 to diode D2, so LED2 is off; Q2 is high, driving LED3 to light up; Q3-Q4 are all low, LED4-LED5 are off, so only LED3 is on.

[0112] When signals Q1 to Q3 are all high and Q4 is low, it indicates that the weft signal strength is at the fourth level. At this time, / Q1 is low, LED1 is off; Q1 is high, / Q2 is low, through the clamping of diode D2, the current flows from resistor R2 to diode D2, so LED2 is off; Q2 is high, / Q3 is low, through the clamping of diode D3, so LED3 is off; Q3 is high, / Q4 is high, driving LED4 to light up; Q4 is low, LED5 is off, so only LED4 is on.

[0113] When signals Q1 to Q4 are all high, it indicates that the weft signal strength is at the fifth level. At this time, / Q1 is low, LED1 is off; Q1 is high, / Q2 is low, through the clamping of diode D2, LED2 is off; Q2 is high, / Q3 is low, through the clamping of diode D3, LED3 is off; Q3 is high, / Q4 is low, through the clamping of diode D4, LED4 is off; Q4 is high, LED5 is on; so only LED5 is on.

[0114] In this embodiment, by detecting the waveform of the weft yarn signal in the detection interval, the effective pulse width is obtained, and then the weft yarn signal strength is determined and displayed, which can effectively guide the adjustment of the sampling sensitivity of the weft yarn signal, improve the accuracy and efficiency of the adjustment, and effectively improve the adjustment efficiency and start-up efficiency of the water jet loom; four groups of detection units are also provided, and the classification of the weft yarn signal strength is more refined, which increases the flexibility of the machine adjustment; the signal strength is displayed by five groups of indicator lights of different colors, and the display is more eye-catching; at the same time, the display device is low in cost and simple and easy to use.

[0115] In one embodiment of the present invention, Figure 6 As shown, a weft feeler 1 comprises a signal strength display device 2 according to any one of the aforementioned embodiments.

[0116] According to the needs, the weft feeler 1 may also include: Figure 7 The weft yarn signal detection and processing circuit, weft detection processing circuit, weft detection interval adjustment circuit and digital tube display are shown.

[0117] In one embodiment of the present invention, Figure 8 As shown, a method for displaying signal strength includes:

[0118] Step S100: Initialize the first strength indication signal and the second strength indication signal at the beginning of detection;

[0119] Step S200: when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the first preset pulse width, outputting a valid first intensity indication signal;

[0120] Step S300: when it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the second preset pulse width, outputting a valid second intensity indication signal; the second preset pulse width is greater than the first preset pulse width;

[0121] Step S400 controls the indicator light corresponding to the strength of the signal to be detected to light up according to the first strength indication signal and the second strength indication signal.

[0122] Specifically, the strength of the signal to be detected is reflected in the effective pulse width of the signal to be detected in the detection interval. The larger the effective pulse width, the greater the signal strength.

[0123] At the beginning of detection, the first signal detection unit and the second signal detection unit are reset to initialize the output signal of the first signal detection unit (i.e., the first strength indication signal Q1) and the output signal of the second signal detection unit (i.e., the second strength indication signal Q2), so that the first strength indication signal and the second strength indication signal are in an invalid state.

[0124] When it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the first preset pulse width, the first signal detection unit outputs a valid first strength indication signal Q1.

[0125] When it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the second preset pulse width, the second signal detection unit outputs a valid second strength indication signal Q2; the second preset pulse width is greater than the first preset pulse width.

[0126] Each signal detection unit includes an RC filter circuit and a D trigger. The effective pulse width of the signal to be detected is compared with the corresponding preset pulse width according to each signal detection unit. The preset pulse width of each signal detection unit is calculated based on the time constant of the RC circuit included in the unit. The time constants of different signal detection units are different.

[0127] The signal to be detected is input into multiple signal detection units at the same time, and its effective pulse width is compared with multiple different preset pulse widths respectively. The interval in which the strength of the signal to be detected falls can be determined according to the comparison result.

[0128] The comparison result between the effective pulse width of the signal to be detected and the first preset pulse width is presented through the first strength indication signal, and the comparison result between the effective pulse width of the signal to be detected and the second preset pulse width is presented through the second strength indication signal.

[0129] According to the first strength indication signal and the second strength indication signal, when the detection is finished, the indicator light corresponding to the strength of the signal to be detected is controlled to light up.

[0130] If it is necessary to make a more detailed classification of the intensity of the signal to be detected, a signal detection unit can be added according to actual needs.

[0131] For example, take 4 groups of signal detection units as an example:

[0132] Initializing the first strength indication signal, the second strength indication signal, the third strength indication signal and the fourth strength indication signal at the beginning of detection;

[0133] When it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the first preset pulse width, outputting a valid first intensity indication signal;

[0134] When it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the second preset pulse width, a valid second intensity indication signal is output; the second preset pulse width is greater than the first preset pulse width;

[0135] When it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the third preset pulse width, a valid third intensity indication signal is output; the third preset pulse width is greater than the second preset pulse width;

[0136] When it is detected that the effective pulse width of the signal to be detected in the detection interval is greater than the fourth preset pulse width, a valid fourth intensity indication signal is output; the fourth preset pulse width is greater than the third preset pulse width;

[0137] According to the first strength indication signal, the second strength indication signal, the third strength indication signal and the fourth strength indication signal, when the detection is finished, the indicator light corresponding to the strength of the signal to be detected is controlled to light up.

[0138] It should be noted that the embodiment of the signal strength display method provided by the present invention and the embodiment of the signal strength display device provided above are based on the same inventive concept and can achieve the same technical effect. Therefore, other specific contents of the embodiment of the signal strength display method can refer to the contents of the embodiment of the signal strength display method above.

[0139] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A signal strength display device, characterized in that: The device is used for displaying the strength of a weft signal in the field of weft detection in textiles, comprising: a signal detection module and a signal strength indication module, wherein the signal detection module and the signal strength indication module are connected; The signal detection module is used to detect the strength of the weft yarn signal in the detection interval, and the signal strength indication module is used to display the detection result after the detection is completed; The signal detection module includes a first signal detection unit and a second signal detection unit; When detection starts, resetting the first signal detection unit and the second signal detection unit; When it is detected that the effective pulse width of the weft yarn signal in the detection interval is greater than the first preset pulse width, the first signal detection unit outputs a valid first intensity indication signal; When it is detected that the effective pulse width of the weft yarn signal in the detection interval is greater than the second preset pulse width, the second signal detection unit outputs a valid second intensity indication signal; the second preset pulse width is greater than the first preset pulse width; The signal strength indication module controls the indicator light corresponding to the strength of the weft yarn signal to light up according to the first strength indication signal and the second strength indication signal when the detection is completed.

2. The signal strength display device according to claim 1, characterized in that: Each signal detection unit includes an RC filter circuit and a D flip-flop, wherein the output end of the RC filter circuit is connected to the edge trigger end of the D flip-flop; The preset pulse width of each signal detection unit is calculated according to the time constant of the corresponding RC filter circuit.

3. The signal strength display device according to claim 2, characterized in that: The set terminal of the D flip-flop is connected to a power supply, and the data terminal is connected to a power supply.

4. The signal strength display device according to claim 2, characterized in that: The RC filter circuit includes: a sixth resistor, a first capacitor, a first inverter, a sixth diode and a seventh resistor; One end of the sixth resistor is respectively connected to the input end of the first inverter, one end of the first capacitor and the positive electrode of the sixth diode; the other end of the sixth resistor is connected to one end of the seventh resistor; the other end of the first capacitor is grounded; and the cathode of the sixth diode is connected to the other end of the seventh resistor.

5. The signal strength display device according to claim 4, characterized in that: The output end of the RC filter circuit is connected to the edge trigger end of the D trigger through the eighth resistor, the connection point of the eighth resistor and the D trigger is respectively connected to the positive electrode of the seventh diode and one end of the ninth resistor, the negative electrode of the seventh diode is connected to the power supply, and the other end of the ninth resistor is grounded.

6. The signal strength display device according to claim 1, characterized in that: The output end of the first signal detection unit includes a positive phase output end and a negative phase output end; The output end of the second signal detection unit includes a positive phase output end and a negative phase output end; The signal strength indication module comprises: A first resistor, a second resistor, a third resistor, a first indicator light, a second indicator light and a third indicator light; The cathode of the first indicator light, the cathode of the second indicator light and the cathode of the third indicator light are connected; The positive electrode of the first indicator light is connected to the inverting output end of the first signal detection unit through the first resistor; The positive electrode of the second indicator light is connected to the positive phase output end of the first signal detection unit through the second resistor; The positive electrode of the third indicator light is connected to the positive phase output end of the second signal detection unit through the third resistor.

7. The signal strength display device according to claim 1, characterized in that: The signal detection module also includes a third signal detection unit and a fourth signal detection unit; When detection starts, resetting the first signal detection unit, the second signal detection unit, the third signal detection unit and the fourth signal detection unit; When it is detected that the effective pulse width of the weft yarn signal in the detection interval is greater than the third preset pulse width, the third signal detection unit outputs a valid third intensity indication signal; the third preset pulse width is greater than the second preset pulse width; When it is detected that the effective pulse width of the weft yarn signal in the detection interval is greater than a fourth preset pulse width, the fourth signal detection unit outputs a valid fourth intensity indication signal; the fourth preset pulse width is greater than the third preset pulse width; The signal strength indication module controls the indicator light corresponding to the strength of the weft yarn signal to light up according to the first strength indication signal, the second strength indication signal, the third strength indication signal and the fourth strength indication signal when the detection is completed.

8. The signal strength display device according to claim 6, characterized in that: The output end of the first signal detection unit, the output end of the second signal detection unit, the output end of the third signal detection unit and the output end of the fourth signal detection unit respectively include a positive phase output end and a negative phase output end; The signal strength indication module comprises: A first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first indicator light, a second indicator light, a third indicator light, a fourth indicator light, a fifth indicator light, a first diode, a second diode, a third diode and a fourth diode; The cathode of the first indicator light, the cathode of the second indicator light, the cathode of the third indicator light, the cathode of the fourth indicator light and the cathode of the fifth indicator light are connected; The positive electrode of the first indicator light is connected to the inverting output end of the first signal detection unit through the first resistor, and is also connected to the positive electrode of the first diode; The positive electrode of the second indicator light is connected to the positive phase output terminal of the first signal detection unit through the second resistor, and is also connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the negative phase output terminal of the second signal detection unit; The positive electrode of the third indicator light is connected to the positive phase output end of the second signal detection unit through the third resistor, and is also connected to the positive electrode of the third diode, and the negative electrode of the third diode is connected to the negative phase output end of the third signal detection unit; The positive electrode of the fourth indicator light is connected to the positive phase output end of the third signal detection unit through the fourth resistor, and is also connected to the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected to the negative phase output end of the fourth signal detection unit; The positive electrode of the fifth indicator light is connected to the positive phase output end of the fourth signal detection unit through the fifth resistor.

9. A weft feeler, characterized in that: A signal strength display device comprising the signal strength display device according to any one of claims 1 to 8.

10. A method for displaying signal strength based on the signal strength display device according to claim 1, characterized in that: Used for weft yarn signal intensity display in textile weft detection field, including: Initializing the first strength indication signal and the second strength indication signal at the beginning of detection; When it is detected that the effective pulse width of the weft yarn signal in the detection interval is greater than the first preset pulse width, outputting a valid first intensity indication signal; When it is detected that the effective pulse width of the weft yarn signal in the detection interval is greater than a second preset pulse width, a valid second intensity indication signal is output; and the second preset pulse width is greater than the first preset pulse width; According to the first intensity indication signal and the second intensity indication signal, when the detection is finished, the indicator light corresponding to the intensity of the weft yarn signal is controlled to light up.

Images