Loop emergency stop control circuit and loop emergency stop control method

Abstract

The application provides a looper emergency stop control circuit and a looper emergency stop control method. The circuit comprises a signal trigger circuit, a bypass switch, a signal output circuit, a logic control unit and an emergency stop output control circuit. The signal trigger circuit is connected with the bypass switch and the signal output circuit respectively, and the logic control unit is connected with the signal trigger circuit, the bypass switch, the signal output circuit and the emergency stop output control circuit respectively. By switching the bypass switch, the looper trolley will not trigger the emergency stop when triggering the limit switch in the case of production line maintenance. The technical scheme of the application can avoid the technical problem that the looper trolley needs to use the hard-wired shielding emergency stop signal or remove the limit switch to avoid triggering the emergency stop when passing through the limit switch in the jog operation mode.

Description

Technical Field

[0001] This application relates to the field of looper emergency stop control technology, specifically to a looper emergency stop control circuit and a looper emergency stop control method. Background Technology

[0002] During production line maintenance, the looper trolley frequently needs to be stopped in either the empty or full looper position for ease of equipment upkeep. When the looper trolley moves to either the empty or full position, it triggers an emergency stop via the emergency stop limit switch, rendering the looper trolley immobile. Currently, the emergency stop signal is pre-shielded with hard wire or the limit switch is removed to prevent this. The looper trolley then returns to its initial state after leaving the emergency stop limit switch area.

[0003] Using the above method, there is a possibility that the emergency stop limit switch may not return to its initial state in a timely manner due to human error. In this case, the emergency stop limit switch fails, preventing the trolley from triggering an emergency stop when it passes the limit switch, thus causing damage to the trolley and nearby equipment. Summary of the Invention

[0004] The purpose of this application is to provide a looper emergency stop control circuit and a looper emergency stop control method to avoid the technical problem in the prior art that requires shielding the emergency stop signal with hard wires or removing the limit switch in advance to avoid triggering the emergency stop.

[0005] To achieve the above objectives, in a first aspect, this application provides a flexible emergency stop control circuit, comprising: a signal triggering circuit, a bypass switch, a signal output circuit, a logic control unit, and an emergency stop output control circuit;

[0006] The signal triggering circuit is connected to the bypass switch and the signal output circuit respectively, and the logic control unit is connected to the signal triggering circuit, the bypass switch, the signal output circuit and the emergency stop output control circuit respectively.

[0007] The signal triggering circuit is used to output an emergency stop limit signal according to the status of the limit switch;

[0008] The bypass switch is used to output an emergency stop limit bypass signal before the looper trolley triggers the limit switch, and to shield the emergency stop limit signal.

[0009] The signal output circuit is used to output a looper emergency stop error signal when an emergency stop limit signal is received;

[0010] The logic control unit is used to output a loop emergency stop request signal after receiving the loop emergency stop error signal, the emergency stop limit signal and the emergency stop limit bypass signal through logic judgment;

[0011] The emergency stop output control circuit is used to control whether the emergency stop of the equipment in the looper area, looper inlet area and looper outlet area is triggered according to the looper emergency stop request signal.

[0012] In some embodiments of this application, based on the aforementioned scheme, the limit switch includes an empty position limit switch and a full position limit switch.

[0013] In some embodiments of this application, based on the aforementioned scheme, the emergency stop limit signal includes an empty position emergency stop limit signal and a full position emergency stop limit signal.

[0014] In some embodiments of this application, based on the aforementioned scheme, the bypass switch includes: a full-position emergency stop limit bypass contact and an empty-position emergency stop limit bypass contact, the full-position emergency stop limit bypass contact and the full-position emergency stop limit signal are connected in parallel, and the empty-position emergency stop limit bypass contact and the empty-position emergency stop limit signal are connected in parallel.

[0015] In some embodiments of this application, based on the aforementioned scheme, the full-position emergency stop limit bypass contact and the empty-position emergency stop limit bypass contact are each a normally open contact of the bypass switch.

[0016] In some embodiments of this application, based on the aforementioned scheme, the bypass switch is a rotary switch with self-resetting capability.

[0017] In some embodiments of this application, based on the foregoing scheme, an emergency stop reset button is further included, which is used to output a looper emergency stop reset signal, and the looper emergency stop reset signal is connected in parallel with the looper emergency stop error signal.

[0018] In some embodiments of this application, based on the foregoing scheme, the emergency stop output control circuit is specifically used for:

[0019] The emergency stop request signal of the looper is converted into the output of the emergency stop relay. The two normally open contacts of the emergency stop relay are connected in series in the emergency stop trigger circuit of the looper inlet area and the emergency stop trigger circuit of the looper outlet area, respectively, thereby controlling whether the emergency stop of the equipment in the looper area, the looper inlet area and the looper outlet area is triggered.

[0020] In some embodiments of this application, based on the aforementioned scheme, the logic control unit is a PLC.

[0021] Secondly, this application provides a looper emergency stop control method, applied to the looper emergency stop control circuit of the first aspect, the looper emergency stop control method comprising:

[0022] The bypass switch outputs an emergency stop limit bypass signal before the looper trolley triggers the limit switch.

[0023] The signal triggering circuit outputs an emergency stop limit signal based on the limit switch status, and the emergency stop limit bypass signal shields the emergency stop limit signal.

[0024] When the signal output circuit receives the emergency stop limit signal, it outputs a looper emergency stop error signal.

[0025] After receiving the looper emergency stop error signal, emergency stop limit signal and emergency stop limit bypass signal, the logic control unit outputs the looper emergency stop request signal through logic judgment.

[0026] The emergency stop output control circuit controls whether the emergency stop of the equipment in the looper area, looper inlet area, and looper outlet area is triggered based on the looper emergency stop request signal.

[0027] The technical solutions provided in this application embodiment have at least the following technical effects or advantages:

[0028] The looper emergency stop control circuit and method provided in this application improve the controllability of the looper emergency stop control circuit by setting a bypass switch, avoiding the technical problem of needing to shield the emergency stop signal with hard wire or remove the limit switch in advance to avoid triggering the emergency stop in the prior art; and can eliminate the possibility of the bypass switch not being reset in time due to human factors, ensuring the effectiveness of the emergency stop limit switch in other operating modes and improving the reliability of the control circuit. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0030] In the attached diagram:

[0031] Figure 1 This is a schematic diagram of the structure of the looper emergency stop control circuit in an embodiment of this application;

[0032] Figure 2 This is a circuit diagram of the signal triggering circuit in an embodiment of this application;

[0033] Figure 3 This is a circuit schematic diagram of the logic control unit in an embodiment of this application;

[0034] Figure 4 This is a logic schematic diagram of the logic control unit in an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the logic control unit in an embodiment of this application;

[0036] Figure 6 This is a flowchart of the looper emergency stop control method according to an embodiment of this application. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] The following detailed description of some embodiments of this application will be provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] Please see Figure 1 This application provides a looper emergency stop control circuit, including: a signal triggering circuit 10, a bypass switch 20, a signal output circuit 30, a logic control unit 40, and an emergency stop output control circuit 50;

[0040] The signal triggering circuit 10 is connected to the bypass switch 20 and the signal output circuit 30 respectively, and the logic control unit 40 is connected to the signal triggering circuit 10, the bypass switch 20, the signal output circuit 30 and the emergency stop output control circuit 50 respectively.

[0041] Among them, the signal triggering circuit 10 is used to output an emergency stop limit signal according to the state of the limit switch;

[0042] The bypass switch 20 is used to output an emergency stop limit bypass signal before the looper trolley triggers the limit switch, and to shield the emergency stop limit signal.

[0043] The signal output circuit 30 is used to output a looper emergency stop error signal when an emergency stop limit signal is received;

[0044] The logic control unit 40 is used to output a loop emergency stop request signal through logic judgment after receiving the loop emergency stop error signal, the emergency stop limit signal and the emergency stop limit bypass signal;

[0045] The emergency stop output control circuit 50 is used to control whether the emergency stop of the equipment in the looper area, the looper inlet area and the looper outlet area is triggered according to the looper emergency stop request signal.

[0046] It should be noted that during production line maintenance, the looper trolley often needs to be stopped in the empty or full looper position for ease of equipment maintenance. When the looper trolley moves to the empty or full looper position, it will trigger an emergency stop via the limit switch, causing the looper trolley to be unable to move.

[0047] Specifically, the bypass switch 20 includes: a full-position emergency stop limit bypass contact and an empty-position emergency stop limit bypass contact; the full-position emergency stop limit bypass contact and the full-position emergency stop limit signal are connected in parallel; and the empty-position emergency stop limit bypass contact and the empty-position emergency stop limit signal are connected in parallel.

[0048] Based on this, the limit switches include the empty position limit switch (EmpSE) and the full position limit switch (FulSE), and the emergency stop limit signals include the empty position emergency stop limit signal and the full position emergency stop limit signal. For example... Figure 2 and Figure 3 As shown, when the looper trolley passes through the empty looper position, the empty looper position limit switch EmpSE is triggered, the empty looper position emergency stop limit output relay LpEmp is de-energized, the normally open contact Emp1 of the empty looper position emergency stop limit output relay LpEmp opens, and the signal triggering circuit 10 outputs the empty looper position emergency stop limit signal. When the looper trolley passes through the full looper position, the full looper position limit switch FulSE is triggered, the full looper position emergency stop limit output relay LpFul is de-energized, the normally open contact Fu1 of the full looper position emergency stop limit output relay LpFul opens, and the signal triggering circuit 10 outputs the full looper position emergency stop limit signal.

[0049] like Figure 3 As shown, the full-position emergency stop limit bypass contact S12 of the bypass switch 20 and the normally open contact Fu1 (output of the full-position emergency stop limit signal) are connected in parallel. The empty-position emergency stop limit bypass contact S34 of the bypass switch 20 and the normally open contact Emp1 (output of the empty-position emergency stop limit signal) are connected in parallel. EnNF1 is a normally open contact of the emergency stop error relay in the looper inlet area emergency stop trigger circuit (output of the looper inlet area emergency stop error signal), and ExNF1 is a normally open contact of the emergency stop error relay in the looper outlet area emergency stop trigger circuit (output of the looper outlet area emergency stop error signal). The normally open contacts EnNF1 and ExNF1 are connected in parallel. LpNF1 is the (looper) emergency stop error relay, and NF1 is a normally open contact of the (looper) emergency stop error relay LpNF1 (output of the looper emergency stop error signal). LpRST1 is the looper emergency stop reset signal output by the emergency stop reset button. The looper emergency stop reset signal is connected in parallel with the normally open contact NF1 (output looper emergency stop error signal).

[0050] It should be noted that the emergency stop of the looper is only triggered when both the normally open contact EnNF1 of the emergency stop error relay in the looper inlet area emergency stop trigger circuit and the normally open contact ExNF1 of the emergency stop error relay in the looper outlet area emergency stop trigger circuit are simultaneously de-energized. That is, the looper only triggers an emergency stop when both the looper inlet and outlet areas experience an emergency stop simultaneously. However, if the limit switch inside the looper triggers an emergency stop, it will cause the looper, the looper inlet area, and the looper outlet area to all trigger emergency stops.

[0051] In some embodiments, the bypass switch 20 is a rotary switch with self-resetting capability, thereby eliminating the possibility of the bypass switch failing to reset in time due to human factors, ensuring the effectiveness of the emergency stop limit switch in other operating modes, and improving the reliability of the control circuit. Further, the bypass switch 20 has four normally open contacts S12, S34, S56, and S78. When the bypass switch 20 is rotated counterclockwise to its final position, the full-position emergency stop limit bypass contact S12 and the normally open contact S56 are closed, shielding the full-position emergency stop limit signal; when rotated clockwise to its final position, the empty-position emergency stop limit bypass contact S34 and the normally open contact S78 are closed, shielding the empty-position emergency stop limit signal; when returned to the intermediate position, both the full-position emergency stop limit bypass contact S12 and the empty-position emergency stop limit bypass contact S34 are open.

[0052] The emergency stop limit bypass signal includes the full-position emergency stop limit bypass signal and the empty-position emergency stop limit bypass signal.

[0053] In some embodiments, the looper emergency stop control circuit further includes an emergency stop reset button, which is used to output a looper emergency stop reset signal, and the looper emergency stop reset signal is connected in parallel with the looper emergency stop error signal.

[0054] like Figure 4 As shown, LpNF10 is the looper emergency stop error signal, originating from a normally open contact of the emergency stop error relay LpNF1 (this normally open contact and normally open contact NF1 both belong to the contacts of the emergency stop error relay LpNF1, and are simultaneously open or closed); LpFu10 is the full-loop position emergency stop limit signal, originating from a normally open contact of the full-loop position emergency stop limit output relay LpFul (this normally open contact and normally open contact Fu1 both belong to the contacts of the full-loop position emergency stop limit output relay LpFul, and are simultaneously open or closed); LpE mp10 is the empty sleeve position emergency stop limit signal, which comes from a normally open contact of the empty sleeve position emergency stop limit output relay LpEmp (this normally open contact and normally open contact Emp1 both belong to the contacts of the empty sleeve position emergency stop limit output relay LpEmp, and are simultaneously open or closed); BPasFul is the full sleeve position emergency stop limit bypass signal, which comes from bypass switch 20; BPasEmp is the empty sleeve position emergency stop limit bypass signal, which comes from bypass switch 20; ESNRQ is the loose sleeve emergency stop request signal, used to control the corresponding emergency stop relay.

[0055] It should be noted that the looper emergency stop error signal LpNF10 is connected to the emergency stop control loop of the looper inlet area and looper outlet area through hardware contacts; on the other hand, the looper emergency stop request signal ESNRQ output by the logic control unit 40 is also connected to the emergency stop control loop of the looper inlet area and looper outlet area.

[0056] Specifically, the logic control unit 40 is a PLC, implemented by PLC software programming, such as... Figure 4 and Figure 5 As shown, based on the emergency stop error signal LpNF10 output by the emergency stop error relay, the full-position emergency stop limit signal LpFu10 output by the full-position emergency stop limit output relay LpFul, the empty-position emergency stop limit signal LpEmp10 output by the empty-position emergency stop limit output relay LpEmp, and the full-position emergency stop limit bypass signal BPasFul and the empty-position emergency stop limit bypass signal BPasEmp output by the bypass switch, these signals are input through the PLC's digital input module. The PLC then uses logical OR and AND operations to determine and output the emergency stop request signal ESNRQ. The emergency stop request signal ESNRQ is output through the PLC's digital output module and the emergency stop relay ESNRQ.

[0057] Furthermore, in the logic control unit 40, the normally open contacts S56 and S78 of the bypass switch 20 are connected to the digital input module of the PLC and enter the controller (CPU), respectively corresponding to the full-position emergency stop limit bypass signal BPasFul and the empty-position emergency stop limit bypass signal BPasEmp in the control logic.

[0058] Therefore, in some embodiments, the emergency stop output control circuit 50 is specifically used for:

[0059] The emergency stop request signal of the looper is converted into the output of the emergency stop relay. The two normally open contacts of the emergency stop relay are connected in series in the emergency stop trigger circuit of the looper inlet area and the emergency stop trigger circuit of the looper outlet area, respectively, thereby controlling whether the emergency stop of the equipment in the looper area, the looper inlet area and the looper outlet area is triggered.

[0060] Based on the same inventive concept, such as Figure 6 As shown, this application also provides a looper emergency stop control method, applied to the looper emergency stop control circuit of the foregoing embodiment, the looper emergency stop control method comprising:

[0061] Step S1: Before the looper trolley triggers the limit switch, the bypass switch 20 outputs an emergency stop limit bypass signal;

[0062] Step S2: The signal triggering circuit 10 outputs an emergency stop limit signal according to the limit switch status, and the emergency stop limit bypass signal shields the emergency stop limit signal.

[0063] Step S3: When the signal output circuit 30 receives the emergency stop limit signal, it outputs a looper emergency stop error signal.

[0064] Step S4: After receiving the looper emergency stop error signal, the emergency stop limit signal and the emergency stop limit bypass signal, the logic control unit 40 outputs the looper emergency stop request signal through logic judgment.

[0065] Step S5: The emergency stop output control circuit 50 controls whether the emergency stop of the equipment in the looper area, the looper inlet area, and the looper outlet area is triggered according to the looper emergency stop request signal.

[0066] In summary, this application provides a looper emergency stop control circuit and method. The looper emergency stop control circuit includes a bypass switch. In jog operation mode, before the looper trolley passes the full-position emergency stop limit switch, the bypass switch is manually switched to the full-position signal bypass position to block the full-position emergency stop limit signal; before the looper trolley passes the empty-position emergency stop limit switch, the bypass switch is manually switched to the empty-position signal bypass position to block the empty-position emergency stop limit signal. This application, by switching the bypass switch, ensures that the looper trolley will not trigger an emergency stop when the limit switch is triggered during production line maintenance or other situations. The technical solution of this application avoids the technical problem of needing to hard-wire and shield the emergency stop signal or remove the limit switch to prevent emergency stop triggering when the looper trolley passes the limit switch in jog operation mode.

[0067] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A looper emergency stop control circuit, characterized in that, include: Signal triggering circuit, bypass switch, signal output circuit, logic control unit, emergency stop output control circuit; The signal triggering circuit is connected to the bypass switch and the signal output circuit respectively, and the logic control unit is connected to the signal triggering circuit, the bypass switch, the signal output circuit and the emergency stop output control circuit respectively. The signal triggering circuit is used to output an emergency stop limit signal according to the state of the limit switch. The bypass switch is used to output an emergency stop limit bypass signal before the looper trolley triggers the limit switch, and to shield the emergency stop limit signal. The signal output circuit is used to output a looper emergency stop error signal when the emergency stop limit signal is received; The logic control unit is used to output a loop emergency stop request signal through logic judgment after receiving the loop emergency stop error signal, the emergency stop limit signal and the emergency stop limit bypass signal; The emergency stop output control circuit is used to control whether the emergency stop of the equipment in the looper area, the looper inlet area and the looper outlet area is triggered according to the looper emergency stop request signal. The bypass switch includes: a full-position emergency stop limit bypass contact and an empty-position emergency stop limit bypass contact. The full-position emergency stop limit bypass contact and the full-position emergency stop limit signal are connected in parallel, and the empty-position emergency stop limit bypass contact and the empty-position emergency stop limit signal are connected in parallel. The bypass switch is a rotary switch with self-resetting capability.

2. The looper emergency stop control circuit according to claim 1, characterized in that, The limit switches include empty position limit switches and full position limit switches.

3. The looper emergency stop control circuit according to claim 1, characterized in that, The emergency stop limit signals include empty position emergency stop limit signals and full position emergency stop limit signals.

4. The looper emergency stop control circuit according to claim 3, characterized in that, The full-position emergency stop limit bypass contact and the empty-position emergency stop limit bypass contact are each a normally open contact of the bypass switch.

5. The looper emergency stop control circuit according to claim 1, characterized in that, Also includes: An emergency stop reset button is provided, which is used to output a looper emergency stop reset signal. The looper emergency stop reset signal is connected in parallel with the looper emergency stop error signal.

6. The looper emergency stop control circuit according to claim 1, characterized in that, The emergency stop output control circuit is specifically used for: The emergency stop request signal of the looper is converted into the output of the emergency stop relay. The two normally open contacts of the emergency stop relay are connected in series in the emergency stop trigger circuit of the looper inlet area and the emergency stop trigger circuit of the looper outlet area, respectively, thereby controlling whether the emergency stop of the equipment in the looper area, the looper inlet area and the looper outlet area is triggered.

7. The looper emergency stop control circuit according to claim 1, characterized in that, The logic control unit is a PLC.

8. A looper emergency stop control method, characterized in that, The looper emergency stop control method, applied to the looper emergency stop control circuit as described in any one of claims 1 to 7, comprises: The bypass switch outputs an emergency stop limit bypass signal before the looper trolley triggers the limit switch. The signal triggering circuit outputs an emergency stop limit signal according to the state of the limit switch, and the emergency stop limit bypass signal shields the emergency stop limit signal; When the signal output circuit receives the emergency stop limit signal, it outputs a looper emergency stop error signal. After receiving the looper emergency stop error signal, the emergency stop limit signal and the emergency stop limit bypass signal, the logic control unit outputs a looper emergency stop request signal through logical judgment. The emergency stop output control circuit controls whether the emergency stop of the equipment in the looper area, the looper inlet area, and the looper outlet area is triggered based on the looper emergency stop request signal.

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