CN111703107A - Double valve detection and protection system and method for press - Google Patents

Abstract

The invention provides a detection and protection system and method for a double-connected valve of a press, wherein the double-connected valve of a press includes two-way switches, and the system includes: a detection unit, the detection unit is respectively connected with the two-way switch, and the detection unit is used for Detect the opening and closing states of the two-way switches within a limited time, and judge whether the two-way switches complete the synchronous action within the limited time according to the opening and closing states. If the two-way switches complete the synchronous action within the limited time, output the corresponding signal, otherwise, the corresponding signal is output through the second channel; the alarm unit and the protection unit, both the alarm unit and the protection unit are connected with the detection unit, for alarming and stopping when the two-way switch does not complete the synchronous action over a limited time. The invention can timely and effectively judge whether the double valve of the press is faulty, and alarm and quickly stop the press when the double valve of the press is faulty, thereby ensuring the working safety of the press.

Description

Double valve detection and protection system and method for press

technical field

The invention relates to the technical field of synchronous detection, in particular to a detection and protection system for a double-connected valve of a press and a detection and protection method for a double-connected valve of a press.

Background technique

At present, the double valve of the pneumatic press is the core component of the press, specifically the electrical and mechanical related linkage components, which can be used to control all the actions of the press. During normal operation, the double valves of the double valve are synchronized to cooperate with the work of the control press, but if the double valves of the double valve are not synchronized during operation, problems will occur whether the press is turned on or off, thus It may cause a safety accident.

From this, it can be seen that in the working process of the press, it is extremely important to know the working state of the double valve in time, and to stop the press in time when the double valve is not working synchronously. However, at present, when detecting the working state of the double valve, it is usually judged by detecting the inlet and outlet air volume of the double valve, which not only has a complicated structure of the detection device, but also has a low action sensitivity.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the technical problems in the above technologies at least to a certain extent. Therefore, an object of the present invention is to propose a detection and protection system for the double-connected valve of the press, which can timely and effectively determine whether the double-connected valve of the press is faulty by detecting whether the two-way switches are synchronized. It can alarm and stop the press quickly, so as to ensure the safety of the press, and at the same time, the structure is simple, the installation is convenient, and the action sensitivity is high.

The second purpose of the present invention is to provide a detection and protection method for a double valve of a press.

In order to achieve the above purpose, the first aspect of the present invention provides a detection and protection system for a double-connected valve of a press. The double-connected valve of the press includes a two-way switch, and the double-connected valve of the press is operated through an internal connecting rod. The device drives the two switches to act at the same time, and the detection and protection system includes: a detection unit, the detection units are respectively connected with the two switches, and the detection unit is used to detect the two switches within a limited time. open and close state, and according to the open and closed state, judge whether the two-way switch completes the synchronous action within the limited time, if the two-way switch completes the synchronous action within the limited time, the corresponding signal is output through the first channel. The two channels of the switches have not completed the synchronous action within the time limit, and the corresponding signal is output through the second channel; the alarm unit is connected to the detection unit, and the alarm unit is used for when the two channels of the switches exceed Alarm when the synchronous action has not been completed within a limited time; a protection unit, the protection unit is connected to the detection unit, and the protection unit is used to control the pressure when the two-way switches have not completed the synchronous action within a limited time Machine stops.

According to the detection and protection system for the double valve of the press proposed by the embodiment of the present invention, a detection unit is provided to connect the two-way switch, so as to detect the opening and closing state of the two-way switch within a limited time, and judge the two-way switch according to the opening and closing state. Whether the synchronous action is performed within the limited time, if the two-way switch completes the synchronous action within the limited time, the corresponding signal will be output through the first channel; if the two-way switch does not complete the synchronous action within the limited time, the corresponding signal will be output through the second channel , and are connected with the detection unit by setting the alarm unit and the protection unit respectively, so as to alarm and control the stop of the press when the two-way switch has not completed the synchronizing action after the limited time, so that it can be detected whether the two-way switch is synchronous It can timely and effectively judge whether the double valve of the press is faulty, and alarm and stop the press quickly when the double valve of the press is faulty, so as to ensure the safety of the press, and at the same time, the structure is simple, the installation is convenient, and the action sensitivity is high. .

In addition, the detection and protection system for the double valve of the press proposed according to the above embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the detection unit includes: a decoder, the first port and the second port of the decoder are respectively connected to the detection power supply through two switches respectively, and the first port of the decoder The third, sixth and sixteenth ports are connected to the detection power supply, and the fourth, fifth and eighth ports of the decoder are all grounded; a capacitor, one end of the capacitor is connected to the detection power supply, the The other end of the capacitor is grounded; the first diode, the cathode of the first diode is connected to the twelfth port of the decoder; the second diode, the cathode of the second diode is connected to the twelfth port of the decoder The thirteenth port of the decoder is connected; the third diode, the cathode of the third diode is connected to the fourteenth port of the decoder; the fourth diode, the fourth The cathode of the diode is connected to the fifteenth port of the decoder; the first optocoupler switch, one end of the input side of the first optocoupler switch is connected to the anodes of the second and third diodes respectively ; a second optocoupler switch, one end of the input side of the second optocoupler switch is connected to the anodes of the first and fourth diodes respectively; a first resistor, one end of the first resistor is connected to the first the other end of the input side of the optocoupler switch is connected to the other end of the first resistor is connected to the detection power supply; the second resistor, one end of the second resistor is connected to the other end of the input side of the second optocoupler switch , the other end of the second resistor is connected to the detection power supply.

Further, the twelfth and fifteenth ports of the decoder form the first channel, and the first channel is used to output the decoded code when the two switches complete the synchronous action within a limited time. The corresponding signal generated by the decoder, the thirteenth and fourteenth ports of the decoder constitute the second channel, and the second channel is used when the two-way switches have not completed the synchronous action for a limited time. , and output the corresponding signal generated by the decoder.

According to an embodiment of the present invention, the limited time is a time threshold at which no safety accident occurs when the double valve of the press operates asynchronously.

According to an embodiment of the present invention, the synchronous actions include synchronous closing and synchronous opening.

According to an embodiment of the present invention, the alarm unit includes an alarm signal lamp, a time relay and an intermediate relay, wherein one side of the coil of the time relay is connected to one end of the output side of the first optocoupler switch, and the time The other side of the coil of the relay is connected to the negative pole of the alarm power supply, the other end of the output side of the first optocoupler switch is connected to the positive pole of the alarm power supply, and one end of the contact of the time relay is respectively connected to one of the coils of the intermediate relay. The side is connected to one end of the alarm signal light, the other end of the contact of the time relay is connected to the positive pole of the alarm power supply, the other side of the coil of the intermediate relay is connected to the negative pole of the alarm power supply, and the contact of the intermediate relay is connected to the negative pole of the alarm power supply. One end of the dot is connected to one end of the alarm signal light, the other end of the contact of the intermediate relay is connected to the positive pole of the alarm power supply, and the other end of the alarm signal light is connected to the negative pole of the alarm power supply.

According to an embodiment of the present invention, the protection unit includes a protection switch, one end of the protection switch is connected to one end of the output side of the second optocoupler switch, and the other end of the output side of the second optocoupler switch is connected to To protect the power supply, the other end of the protection switch is connected to the control circuit of the press.

According to an embodiment of the present invention, the decoder selects a decoder whose model is 74LS138P.

In order to achieve the above purpose, the second aspect of the present invention proposes a detection and protection method for a double valve of a press. The double valve of the press includes a two-way switch, and the double valve of the press operates through an internal connecting rod. The device drives the two-way switches to act simultaneously, and the method includes the following steps: detecting the opening and closing states of the two-way switches within a limited time; judging whether the two-way switches are completed within the limited time according to the opening and closing states Synchronous action; if the two-way switch completes the synchronous action within a limited time, the corresponding signal will be output through the first channel; if the two-way switch has not completed the synchronous action within the limited time, the corresponding signal will be output through the second channel. And alarm and control the stop of the press.

According to the detection and protection method for a double valve of a press proposed in the embodiment of the present invention, by detecting the open and closed states of the two-way switches within a limited time, it is possible to judge whether the two-way switches have completed synchronous actions within a limited time according to the open and closed states, and finally When the two-way switch completes the synchronous action within a limited time, the corresponding signal can be output through the first channel, and when the two-way switch has not completed the synchronous action within the limited time, the corresponding signal can be output through the second channel, and alarm and control The press is stopped, thus, it is possible to timely and effectively determine whether the double valve of the press is faulty by detecting whether the two-way switch is synchronized, and alarm and quickly stop the press when the double valve of the press is faulty, so as to ensure the press. The work safety is high, and the action sensitivity is high.

In addition, the detection and protection method for a double valve of a press proposed according to the above embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the limited time is a time threshold at which no safety accident occurs when the double valve of the press operates asynchronously.

Description of drawings

1 is a schematic block diagram of a double valve detection and protection system for a press according to an embodiment of the present invention;

2 is a circuit diagram of a detection unit according to an embodiment of the present invention;

3 is a pin diagram of a decoder according to an embodiment of the present invention;

4 is a circuit diagram of an alarm unit according to an embodiment of the present invention;

5 is a circuit diagram of a protection unit according to an embodiment of the present invention;

6 is a flowchart of a method for detecting and protecting a double valve of a press according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the double valve of the press used by the detection and protection system and method of the double valve of the press according to the embodiment of the present invention includes two switches. The action of the two-way switch can reflect the state of the double valve of the press in real time. The following will take the AD-SL231D-406D-M2-DD2 double valve of the press as an example to illustrate the double valve of the press in the embodiment of the present invention. The valve detection and protection system and method, wherein the two-way switch in the double valve of the AD-SL231D-406D-M2-DD2 press is a two-way micro switch.

As shown in FIG. 1 , the double valve detection and protection system of the embodiment of the present invention includes a detection unit 10 , an alarm unit 20 and a protection unit 30 . The detection unit 10 is respectively connected with the two-way switches, and the detection unit 10 is used to detect the open and closed states of the two-way switches within a limited time, and judge whether the two-way switches have completed the synchronous action within the limited time according to the open and closed states. If the two-way switch completes the synchronous action within a limited time, the corresponding signal will be output through the first channel. If the two-way switch has not completed the synchronous action within the limited time, the corresponding signal will be output through the second channel; the alarm unit 20 is connected to the detection unit 10. , the alarm unit 20 is used to give an alarm when the two-way switch has not completed the synchronizing action within the time limit; the protection unit 30 is connected with the detection unit 10, and the protection unit 30 is used for when the two-way switch has not completed the synchronous action within the time limit Control the press stop.

In an embodiment of the present invention, as shown in FIG. 2 , the detection unit 10 includes: a decoder, and the first and second ports of the decoder, that is, the No. 1 pin and the No. 2 pin can respectively pass through two The circuit switch is connected to the detection power supply, that is, the +5V power supply, and the third, sixth, and sixteenth ports of the decoder, that is, pins 3, 6, and 16 can be connected to the detection power supply, that is, + 5V power supply, the fourth, fifth and eighth ports of the decoder, namely pins 4, 5 and 8 are all grounded; capacitor C1, one end of capacitor C1 can be connected to the detection power supply, namely + 5V power supply, the other end of the capacitor C1 can be grounded; the first diode Q1, the cathode of the first diode Q1 can be connected to the twelfth port of the decoder, that is, the 12th pin; the second diode Q2 , the cathode of the second diode Q2 can be connected to the thirteenth port of the decoder, that is, pin 13; the third diode Q3, the cathode of the third diode Q3 can be connected to the tenth port of the decoder. The four ports are connected to pin 14; the fourth diode Q4, the cathode of the fourth diode Q4 can be connected to the fifteenth port of the decoder, that is, the pin 15; the first optocoupler switch VD1, One end of the input side of the first optocoupler switch VD1 can be connected to the second and third diodes, namely the anodes of Q2 and Q3, respectively; the second optocoupler switch VD2 and one end of the input side of the second optocoupler switch VD2 The first and fourth diodes, namely the anodes of Q1 and Q4 are connected; the first resistor R1, one end of the first resistor R1 can be connected to the other end of the input side of the first optocoupler switch VD1, and the other end of the first resistor R1 It can be connected to the detection power supply, that is, the +5V power supply; the second resistor R2, one end of the second resistor R2 can be connected to the other end of the input side of the second optocoupler switch VD2, and the other end of the second resistor R2 can be connected to the detection power supply, That is +5V power supply.

Among them, the decoder can choose the decoder model 74LS138P, its pin diagram is shown in 3, and its function truth table is shown in the following table 1. Specifically, the 74LS138P decoder can decode according to the binary signals of the input terminals A2, A1, and A0, and can output a low-level signal through the corresponding decimal output terminal after decoding. When the terminal, that is, the E1 terminal is high, and the other two strobe terminals, that is, the E2 and E3 terminals are low, the address terminal, that is, the binary code of A0, A1, and A2 can be used at the output terminals corresponding to Y0 to Y7. The low level is interpreted, for example, when A2A1A0=110, a low level can be output through the Y6 terminal, where "1" is a high level and "0" is a low level.

Table 1

In an embodiment of the present invention, the twelfth and fifteenth ports of the decoder, that is, the 12th pin and the 15th pin, can form the first channel, and the two-way switch can complete the synchronous action within a limited time. When , the corresponding signal generated by the decoder is output, that is, the normal state signal; in addition, the thirteenth and fourteenth ports of the decoder, that is, pins 13 and 14, can form the second channel, which can be used in two When the way switch exceeds the limit time and still does not complete the synchronization action, the corresponding signal generated by the decoder, that is, the abnormal state signal, is output.

For example, when the two switches complete the synchronous action within a limited time, such as when the synchronization is disconnected as shown in Figure 2, the No. 1 pin and No. 2 pin of the decoder can be kept low, corresponding to the The state in the encoder is 000, and the corresponding low-level output can be obtained by further decoding the decoder as Y0, that is, pin 15; similarly, when the two switches complete the synchronous action within a limited time, such as synchronous closing When , the No. 1 pin and No. 2 pin of the decoder can maintain a high level, and the corresponding state in the decoder is 011. Further decoding by the decoder can obtain the corresponding high-level output as Y3, That is, the 12th pin, the 12th pin and the 15th pin of the decoder can be further connected to form the first channel, so that the two switches can complete the synchronous action within a limited time, that is, the normal state is classified into one category, and at the same time It can ensure that the signals generated when the two-way switches complete the synchronous action within a limited time, that is, the normal state signals are converted between pins 12 and 15.

When the two switches have not completed the synchronous action within a limited time, for example, they are not disconnected synchronously, and the micro switch X0 is disconnected first, the No. 1 pin of the decoder remains low, and the No. 2 pin remains high. level, the corresponding state in the decoder is 010, and the corresponding low-level output can be obtained through the decoder to decode Y2, that is, pin No. 13; similarly, when the two-way switch exceeds the limited time, it is still not completed. Synchronous action, for example, when it is not closed synchronously and the micro switch X0 is closed first, the No. 1 pin of the decoder can be kept high, and the No. 2 pin can be kept low, corresponding to the state in the decoder It is 001, and the corresponding high-level output is Y1, that is, the 14th pin, which is further decoded by the decoder. Further, the 13th pin and 14th pin of the decoder can be connected to form a second channel to The two-way switch has not completed the synchronous action within the time limit, that is, the abnormal state is classified into one category. At the same time, it can ensure that the signal generated when the two-way switch has not completed the synchronous action after the time limit, that is, the normal state signal is on pin 13. and switch between pin 14.

In one embodiment of the present invention, as shown in FIG. 4 , the alarm unit may include an alarm signal lamp HL1, a time relay KT and an intermediate relay KA, wherein one side of the coil KT of the time relay KT may be connected with the first optocoupler switch VD1 The other side of the coil KT of the time relay KT can be connected to the negative pole of the alarm power supply, that is, the 0V terminal, and the other end of the output side of the first optocoupler switch VD1 is connected to the positive pole of the alarm power supply, that is, the +24V terminal, the time relay One end of the contact KT of KT is connected to one side of the coil KA of the intermediate relay KA and one end of the alarm signal lamp HL1 respectively, and the other end of the contact KT of the time relay KT can be connected to the positive pole of the alarm power supply, that is, the +24V terminal, the intermediate relay The other side of the coil KA of KA can be connected to the negative pole of the alarm power supply, namely the 0V terminal, one end of the contact KA of the intermediate relay KA is connected to one end of the alarm signal lamp HL1, and the other end of the contact KA of the intermediate relay KA can be connected to the alarm The positive pole of the power supply is the +24V terminal, and the other terminal of the alarm signal lamp HL1 can be connected to the negative pole of the alarm power supply, that is, the 0V terminal.

In an embodiment of the present invention, as shown in FIG. 5 , the protection unit 30 may include a protection switch SB1, one end of the protection switch SB1 is connected to one end of the output side of the second optocoupler switch VD2, and the output of the second optocoupler switch VD2 The other end of the side is connected to the protection power supply, that is, the +24V end, and the other end of the protection switch SB1 is connected to the control circuit of the press. By connecting the protection switch with the second optocoupler switch, it is possible to perform emergency stop control on the press when the detection unit outputs an abnormal state signal.

Based on the circuits shown in Figure 4 and Figure 5, the limited time can be set to 0.3s, that is, the double valve of the press does not complete the synchronous action within 0.3s, and it is considered to be in a normal state. When the double valve of the press exceeds 0.3s, there is no When the synchronous action is completed, it is regarded as a fault state. Therefore, when the double valve of the press does not operate synchronously, the fault signal output by the first optocoupler switch VD1 can turn on the time relay KT, after the screening of the time relay KT and the intermediate relay KA , If the double valve of the press does not complete the synchronous action for more than 0.3s, the contact KT and the contact KA are closed, so that the alarm signal light HL1 is illuminated, and the second optocoupler switch VD2 is blocked, and the emergency stop control circuit of the press is disconnected. Press emergency stop; if the double valve of the press completes the synchronous action within 0.3s, the press works normally.

It should be noted that the above limited time is the time threshold for the double valve of the press to work according to different standards, and no safety accident will occur. Therefore, in order to avoid unnecessary alarms and emergency stop operations, a delay circuit can also be used. Delay the fault phenomenon.

According to the detection and protection system for the double valve of the press proposed by the embodiment of the present invention, a detection unit is provided to connect the two-way switch, so as to detect the opening and closing state of the two-way switch within a limited time, and judge the two-way switch according to the opening and closing state. Whether the synchronous action is performed within the limited time, if the two-way switch completes the synchronous action within the limited time, the corresponding signal will be output through the first channel; if the two-way switch does not complete the synchronous action within the limited time, the corresponding signal will be output through the second channel , and are connected with the detection unit by setting the alarm unit and the protection unit respectively, so as to alarm and control the stop of the press when the two-way switch has not completed the synchronizing action after the limited time, so that it can be detected whether the two-way switch is synchronous It can timely and effectively judge whether the double valve of the press is faulty, and alarm and stop the press quickly when the double valve of the press is faulty, so as to ensure the safety of the press, and at the same time, the structure is simple, the installation is convenient, and the action sensitivity is high. .

Corresponding to the above embodiments, the present invention also proposes a detection and protection method for a double valve of a press.

As shown in FIG. 6 , the method for detecting and protecting a double valve of a press according to an embodiment of the present invention includes the following steps:

S1, detecting the open and closed states of the two-way switches within a limited time.

S2, according to the open and closed state, determine whether the two-way switch completes the synchronous action within the limited time.

S3, if the two switches complete the synchronous action within a limited time, output the corresponding signal through the first channel.

S4, if the two-way switch fails to complete the synchronous action within the time limit, output the corresponding signal through the second channel, and alarm and control the press to stop.

In an embodiment of the present invention, the detection unit can detect the open and closed states of the two-way switches within a limited time, and judge whether the two-way switches have completed synchronous actions within the limited time according to the open and closed states.

Specifically, as shown in FIG. 2 , the on-off state of the two switches within a limited time can be detected through pins 1 and 2. When the two switches complete the synchronous action within a limited time, for example, as shown in FIG. 2 When the synchronization is disconnected, the No. 1 pin and No. 2 pin of the decoder can maintain a low level, and the corresponding state in the decoder is 000, and the corresponding low level can be obtained by further decoding by the decoder. The output is Y0, that is, pin 15; similarly, when the two switches complete the synchronous action within a limited time, for example, when they are synchronously closed, both pins 1 and 2 of the decoder can maintain a high level , the corresponding state in the decoder is 011, and the corresponding high-level output can be obtained by decoding the decoder as Y3, that is, the 12th pin, and the 12th pin and 15th pin of the decoder can be further used. The pins are connected to form the first channel, so that the two-way switches can complete the synchronous action within a limited time, that is, the normal state is classified into one category, and at the same time, it can ensure that the signals generated when the two-way switches complete the synchronous action within a limited time are all in the 12th reference. switch between pin and pin 15.

When the two switches have not completed the synchronous action within a limited time, for example, they are not disconnected synchronously, and the micro switch X0 is disconnected first, the No. 1 pin of the decoder remains low, and the No. 2 pin remains high. level, the corresponding state in the decoder is 010, and the corresponding low-level output can be obtained through the decoder to decode Y2, that is, pin No. 13; similarly, when the two-way switch exceeds the limited time, it is still not completed. Synchronous action, for example, when it is not closed synchronously and the micro switch X0 is closed first, the No. 1 pin of the decoder can be kept high, and the No. 2 pin can be kept low, corresponding to the state in the decoder It is 001, and the corresponding high-level output is Y1, that is, the 14th pin, which is further decoded by the decoder. Further, the 13th pin and 14th pin of the decoder can be connected to form a second channel to The two-way switch has not completed the synchronous action within the time limit, that is, the abnormal state is classified into one category. At the same time, it can ensure that the signal generated when the two-way switch has not completed the synchronous action after the time limit, that is, the normal state signal is on pin 13. and switch between pin 14.

Further, the first channel can be formed according to the No. 12 pin and No. 15 pin of the decoder, and the corresponding signal generated by the decoder can be output when the two-way switch completes the synchronous action within a limited time, that is, the normal output signal. ; In addition, the second channel can be formed according to the No. 13 pins and No. 14 pins of the decoder, and when the two-way switches have not completed the synchronization action within the time limit, the corresponding signal generated by the decoder can be output, that is, the abnormal output Signal.

In an embodiment of the present invention, the alarm unit can be used to give an alarm when the two-way switch has not completed the synchronizing action within a limited time. Specifically, as shown in FIG. 4 , the alarm unit may include an alarm signal lamp HL1, a time relay KT and an intermediate relay KA, wherein one side of the coil KT of the time relay KT may be connected to one end of the output side of the first optocoupler switch VD1, The other side of the coil KT of the time relay KT can be connected to the negative pole of the alarm power supply, that is, the 0V terminal, and the other end of the output side of the first optocoupler switch VD1 is connected to the positive pole of the alarm power supply, that is, the +24V terminal. One end is respectively connected to one side of the coil KA of the intermediate relay KA and one end of the alarm signal lamp HL1, and the other end of the contact KT of the time relay KT can be connected to the positive pole of the alarm power supply, that is, the +24V end, and the other end of the coil KA of the intermediate relay KA. One side can be connected to the negative pole of the alarm power supply, that is, the 0V terminal, one end of the contact KA of the intermediate relay KA is connected to one end of the alarm signal lamp HL1, and the other end of the contact KA of the intermediate relay KA can be connected to the positive pole of the alarm power supply, that is, +24V The other end of the alarm signal lamp HL1 can be connected to the negative pole of the alarm power supply, that is, the 0V end.

In one embodiment of the present invention, the emergency stop of the press can be controlled by the protection unit when the two-way switch fails to complete the synchronous action within a defined time. Specifically, as shown in FIG. 5 , the protection unit may be a protection switch SB1, one end of the protection switch SB1 is connected to one end of the output side of the second optocoupler switch VD2, and the other end of the output side of the second optocoupler switch VD2 is connected to the protection power supply , that is, the +24V terminal, the other terminal of the protection switch SB1 is connected to the control circuit of the press.

Based on the circuits shown in Figure 4 and Figure 5, the limited time can be set to 0.3s, that is, the double valve of the press does not complete the synchronous action within 0.3s, and it is considered to be in a normal state. When the double valve of the press exceeds 0.3s, there is no When the synchronous action is completed, it is regarded as a fault state. Therefore, when the double valve of the press does not operate synchronously, the fault signal output by the first optocoupler switch VD1 can turn on the time relay KT, after the screening of the time relay KT and the intermediate relay KA , If the double valve of the press does not complete the synchronous action for more than 0.3s, the contact KT and the contact KA are closed, so that the alarm signal light HL1 is illuminated, and the second optocoupler switch VD2 is blocked, and the emergency stop control circuit of the press is disconnected. Press emergency stop; if the double valve of the press completes the synchronous action within 0.3s, the press works normally.

It should be noted that the above limited time is the time threshold for the double valve of the press to work according to different standards, and no safety accident will occur. Therefore, in order to avoid unnecessary alarms and emergency stop operations, a delay circuit can also be used. Delay the fault phenomenon.

According to the detection and protection method for a double valve of a press proposed in the embodiment of the present invention, by detecting the open and closed states of the two-way switches within a limited time, it is possible to judge whether the two-way switches have completed synchronous actions within a limited time according to the open and closed states, and finally When the two-way switch completes the synchronous action within a limited time, the corresponding signal can be output through the first channel, and when the two-way switch has not completed the synchronous action within the limited time, the corresponding signal can be output through the second channel, and alarm and control The press is stopped, thus, it is possible to timely and effectively determine whether the double valve of the press is faulty by detecting whether the two-way switch is synchronized, and alarm and quickly stop the press when the double valve of the press is faulty, so as to ensure the press. The work safety is high, and the action sensitivity is high.

In the present invention, unless otherwise expressly specified and limited, the term "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection. Connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the connection between two elements or the interaction between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a press double valve detects protection system, its characterized in that, press double valve includes two tunnel switches, drive two tunnel through inside connecting rod device during press double valve action the switch moves simultaneously, it includes to detect protection system:

the detection unit is respectively connected with the two switches, and is used for detecting the opening and closing states of the two switches within a limited time, judging whether the two switches complete synchronous action within the limited time according to the opening and closing states, outputting a corresponding signal through a first channel if the two switches complete synchronous action within the limited time, and outputting a corresponding signal through a second channel if the two switches do not complete synchronous action after exceeding the limited time;

the alarm unit is connected with the detection unit and is used for giving an alarm when the two paths of switches exceed the limited time and do not finish synchronous action;

and the protection unit is connected with the detection unit and is used for controlling the shutdown of the press machine when the two paths of switches exceed the limited time and still do not finish the synchronous action.

2. The press double valve detection and protection system according to claim 1, wherein the detection unit comprises:

the first port and the second port of the decoder are respectively and correspondingly connected to a detection power supply through the two paths of micro switches, the third port, the sixth port and the sixteenth port of the decoder are connected to the detection power supply, and the fourth port, the fifth port and the eighth port of the decoder are all grounded;

one end of the capacitor is connected to the detection power supply, and the other end of the capacitor is grounded;

a cathode of the first diode is connected with a twelfth port of the decoder;

a cathode of the second diode is connected with a thirteenth port of the decoder;

a cathode of the third diode is connected with a fourteenth port of the decoder;

a cathode of the fourth diode is connected with a fifteenth port of the decoder;

one end of the input side of the first optical coupling switch is connected with the anodes of the second diode and the third diode respectively;

one end of the input side of the second optical coupling switch is connected with the anodes of the first diode and the fourth diode respectively;

one end of the first resistor is connected with the other end of the input side of the first optocoupler switch, and the other end of the first resistor is connected to the detection power supply;

and one end of the second resistor is connected with the other end of the input side of the second optocoupler switch, and the other end of the second resistor is connected to the detection power supply.

3. The detection and protection system for the double valve of the press machine as claimed in claim 2, wherein the twelfth and fifteenth ports of the decoder form the first channel, the first channel is used for outputting corresponding signals generated by the decoder when the two switches complete synchronous action within a limited time, the thirteenth and fourteenth ports of the decoder form the second channel, and the second channel is used for outputting corresponding signals generated by the decoder when the two switches do not complete synchronous action beyond the limited time.

4. The detection and protection system for the double valve of the press machine as claimed in claim 3, wherein the limited time is a time threshold value when the double valve of the press machine does not perform synchronous actions and no safety accident occurs.

5. The press double valve detection and protection system of claim 4, wherein the synchronous action comprises a synchronous closing and a synchronous opening.

6. The detection and protection system for the double valve of the press machine as claimed in claim 5, wherein the alarm unit comprises an alarm signal lamp, a time relay and an intermediate relay, wherein one side of a coil of the time relay is connected with one end of an output side of the first optical coupling switch, the other side of the coil of the time relay is connected with a negative electrode of an alarm power supply, the other end of the output side of the first optical coupling switch is connected with a positive electrode of the alarm power supply, one end of a contact of the time relay is respectively connected with one side of the coil of the intermediate relay and one end of the alarm signal lamp, the other end of the contact of the time relay is connected with the positive electrode of the alarm power supply, the other side of the coil of the intermediate relay is connected with the negative electrode of the alarm power supply, one end of the contact of the intermediate relay is connected with one end, the other end of the contact of the intermediate relay is connected with the anode of the alarm power supply, and the other end of the alarm signal lamp is connected with the cathode of the alarm power supply.

7. The detection and protection system for the double valve of the press machine as claimed in claim 6, wherein the protection unit comprises a protection switch, one end of the protection switch is connected with one end of the output side of the second optical coupling switch, the other end of the output side of the second optical coupling switch is connected to a protection power supply, and the other end of the protection switch is connected to a control circuit of the press machine.

8. The press double valve detection protection system of claim 7, wherein the decoder is a type 74LS138P decoder.

9. A detection and protection method for a duplex valve of a press machine is disclosed, wherein the duplex valve of the press machine comprises two switches, and the two switches are driven to simultaneously act through an internal connecting rod device when the duplex valve of the press machine acts, and the method comprises the following steps:

detecting the opening and closing states of the two paths of switches within a limited time;

judging whether the two paths of switches complete synchronous actions within a limited time according to the opening and closing states;

if the two switches complete synchronous action within the limited time, outputting corresponding signals through a first channel;

if the two switches do not complete synchronous action after exceeding the limited time, outputting corresponding signals through a second channel, and alarming and controlling the press machine to stop.

10. The detection and protection method for the double valve of the press machine as claimed in claim 9, wherein the limited time is a time threshold value when the double valve of the press machine does not perform synchronous actions and no safety accident occurs.

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