Emergency stop switch self-locking control device

Abstract

The utility model provides an emergency stop switch self-locking control device which is connected with an emergency stop switch and comprises a switch device, a switch driving module and a switch driving signal generating module, the switch device is connected between the emergency stop switch and a controlled device, the input end of the switch driving signal generating module is connected with the emergency stop switch, and the output end of the switch driving signal generating module is connected with the controlled device. The output end of the switch driving signal generation module is connected with the input end of the switch driving module, the output end of the switch driving module is connected with the control end of the switch equipment, when it is detected that the emergency stop switch is pressed down, the switch driving signal generation module generates a driving signal and sends the driving signal to the switch driving module, and the switch driving module controls the switch equipment to keep off. By introducing a self-locking mechanism, the sudden stop switch is prevented from being unlocked by mistake under the condition that the sudden stop switch is not properly reset. Even if an operator mistakenly presses or touches the emergency stop switch, the equipment still cannot automatically restore power supply, and the problem that the equipment is accidentally started due to mistaken unlocking of the emergency stop switch is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit technical field, more particularly, relate to a kind of emergency stop switch self-locking control device. BACKGROUND

[0002] Emergency stop switch is generally used to cut off the power supply of moving parts such as air cylinder and motor, so that they stop or return to the initial state. The emergency stop switch has a self-locking function. After pressing, the button needs to be rotated to pop up and restore the power supply of the moving parts. Although the emergency stop switch has a self-locking function, if it is mistakenly unlocked or pressed and immediately released (rotates the button), it may cause product damage or even personal injury in some cases.

[0003] Therefore, a new solution is needed. SUMMARY

[0004] The utility model aims at providing a kind of emergency stop switch self-locking control device.

[0005] According to one aspect of the utility model, an emergency stop switch self-locking control device is provided, which is connected to the emergency stop switch and includes a switch device, a switch drive module and a switch drive signal generation module. The switch device is connected between the emergency stop switch and the controlled device. The input end of the switch drive signal generation module is connected to the emergency stop switch. The output end of the switch drive signal generation module is connected to the input end of the switch drive module. The output end of the switch drive module is connected to the control end of the switch device. When the emergency stop switch is pressed, the switch drive signal generation module generates a drive signal and sends it to the switch drive module. The switch drive module controls the switch device to remain disconnected.

[0006] In the emergency stop switch self-locking control device provided by the utility model, the switch drive signal generation module includes a D flip-flop and a clock signal capture unit. The input end of the clock signal capture unit is connected to the emergency stop switch. The output end of the clock signal capture unit is connected to the clock signal end CLK of the D flip-flop. The output end Q of the D flip-flop is connected to the input end of the switch drive module. When the emergency stop switch is pressed, the clock signal capture unit generates an edge pulse signal. The D flip-flop outputs the level of the input end D of the D flip-flop to the switch drive module under the control of the edge pulse signal.

[0007] The clock signal capture unit comprises a first voltage dividing resistor R1, a second voltage dividing resistor R2 and a Schmitt inverter, the first end of the first voltage dividing resistor R1 is connected with the emergency stop switch, the second end of the first voltage dividing resistor R1 is connected with the first end of the second voltage dividing resistor R2 and the input end of the Schmitt inverter, the output end of the Schmitt inverter is connected with the clock signal end CLK of the D flip-flop, and the second end of the second voltage dividing resistor R2 is grounded.

[0008] In the emergency stop switch self-locking control device, the input end D of the D flip-flop is connected with a low level.

[0009] In the emergency stop switch self-locking control device, the input end D of the D flip-flop is connected with a high level, and the switch driving signal generation module further comprises an inverter, which is connected between the output end Q of the D flip-flop and the input end of the switch driving module.

[0010] In the emergency stop switch self-locking control device, the switch device is an electronic switch or a relay.

[0011] The emergency stop switch self-locking control device has the following beneficial effects: the emergency stop switch self-locking control device is used, the switch device is connected in series with the emergency stop switch, when the emergency stop switch is pressed, only the emergency stop switch is unlocked, the power supply of the controlled device cannot be restored, and the power supply can be restored only by resetting or resetting the switch driving signal generation module, thereby solving the risk of false unlocking of the emergency stop switch, avoiding product damage or personal injury caused by false unlocking of the emergency stop switch, and ensuring that the device can stop running immediately in an emergency, and avoiding unnecessary false unlocking and device restart problems. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings:

[0013] Figure 1 The principle diagram of the emergency stop switch self-locking control device is shown;

[0014] Figure 2 The circuit structure schematic diagram of the emergency stop switch self-locking control device provided in the first embodiment of the present application is shown;

[0015] Figure 3The utility model discloses an emergency stop switch self-locking control device and an emergency stop switch. DETAILED DESCRIPTION

[0016] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings and specific embodiments of the specification. It should be understood that the specific features of the embodiments of the utility model and the embodiments are detailed descriptions of the technical solutions of the application, and are not limitations of the technical solutions of the application. In the case of no conflict, the technical features of the embodiments of the utility model and the embodiments can be combined with each other.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0018] Figure 1 The utility model provides an emergency stop switch self-locking control device's schematic diagram. As Figure 1 The utility model provides an emergency stop switch self-locking control device, is connected in emergency stop switch 100, including switch equipment 200, switch drive module 300 and switch drive signal generation module 400, switch equipment 200 is connected between emergency stop switch 100 and controlled equipment, the input of switch drive signal generation module 400 is connected emergency stop switch 100, the output of switch drive signal generation module 400 is connected switch drive module 300's input, switch drive module 300's output is connected switch equipment 200's control end, when detecting emergency stop switch 100 is pressed, switch drive signal generation module 400 generates drive signal and sends to switch drive module 300, and switch drive module 300 controls switch equipment 200 and keeps disconnected. Wherein, switch equipment 200 is electronic switch or relay.

[0019] The emergency stop switch is an important part of the traditional safety control system, usually used to quickly cut off the power supply or stop the device running in emergency situations. The emergency stop switch 100 in the device serves as the input end, triggering the behavior of other control modules by operating the switch. When the emergency stop switch is pressed, it indicates that the device has entered the emergency stop state and must stop working to ensure safety. The switch device 200 is connected between the emergency stop switch and the controlled device, responsible for controlling the on-off of the current. By controlling the on-off of the current, the switch device directly affects the running state of the controlled device. The role of the device is to quickly disconnect the circuit when the emergency stop switch is triggered, ensuring that the device stops working, thereby protecting the safety of personnel and equipment. The switch drive signal generation module 400 is one of the cores of the control system. It receives signals from the emergency stop switch, generates control signals and transmits them to the switch drive module 300. The role of this module is to determine whether to trigger the switch drive module to keep the switch device disconnected when the emergency stop switch is pressed. Through the operation of this module, it ensures that even if the emergency stop switch is unlocked, the control system can prevent the device from restarting to avoid accidents. The switch drive module 300 receives control signals from the switch drive signal generation module 400 and controls the action of the switch device 200. Its output end is connected to the switch device 200 and is responsible for keeping the switch device disconnected. Even if the emergency stop switch is mistakenly unlocked, the switch drive module will keep the switch device disconnected, ensuring that the device will not start unexpectedly.

[0020] In this embodiment, when the emergency stop switch is pressed, the system will trigger the switch device to disconnect the circuit, and the device will enter the emergency stop state. However, the traditional emergency stop switch system often has the risk of accidental start of the device after being mistakenly unlocked. In this utility model, when the emergency stop switch 100 is pressed, the switch drive signal generation module 400 will generate a drive signal and send it to the switch drive module 300, which will control the switch device 200 to remain disconnected, even if the emergency stop switch is unlocked, the power supply will not be restored. To restore power supply to the device, you must first reset or reset the switch drive signal generation module. Only after resetting, the switch drive module will allow the switch device to reconnect the circuit, thereby restoring the device to run. This design ensures that even if the emergency stop switch is mistakenly unlocked, the device will not restart due to misoperation.

[0021] By introducing the self-locking mechanism, the emergency stop switch is prevented from being mistakenly unlocked without proper reset. Even if the operator mistakenly presses or touches the emergency stop switch, the device cannot automatically restore power supply, avoiding the problem of accidental start of the device caused by mistaken unlocking of the emergency stop switch. This design significantly improves the safety of the system and reduces the risk caused by misoperation.

[0022] Embodiment one

[0023] Figure 2The utility model discloses an emergency stop switch self-locking control device and an emergency stop switch, and belongs to the field of electrical control. Figure 2 As shown in the utility model provides an emergency stop switch self-locking control device includes switch equipment 200, switch drive module 300 and switch drive signal generation module 400. Among them, the switch drive signal generation module 400 includes D trigger 410 and clock signal capture unit 420, the input of clock signal capture unit 420 is connected with the emergency stop switch 100, the output of clock signal capture unit 420 is connected with the clock signal end CLK of D trigger 410, and the output Q of D trigger 410 is connected with the input of switch drive module 300, when the emergency stop switch 100 is pressed, clock signal capture unit 420 generates edge pulse signal, and D trigger 410 outputs the level of the input D of D trigger 410 to switch drive module 300 under the control of edge pulse signal.

[0024] Further, in the embodiment, the clock signal capture unit 420 includes a first voltage dividing resistor R1, a second voltage dividing resistor R2, and a Schmitt inverter 4201. The first end of the first voltage dividing resistor R1 is connected to the emergency stop switch 100. The second end of the first voltage dividing resistor R1 is connected to the first end of the second voltage dividing resistor R2 and the input end of the Schmitt inverter 4201. The output end of the Schmitt inverter 4201 is connected to the clock signal end CLK of the D flip-flop. The second end of the second voltage dividing resistor R2 is grounded.

[0025] In the embodiment, the clock signal capture unit functions to convert the physical action (e.g., pressing the switch) of the emergency stop switch into a clear and stable rising edge pulse signal for use by the subsequent flip-flop module. The module forms a voltage dividing network with the emergency stop switch through the voltage dividing resistors (R1 and R2), ensuring that the input voltage of the emergency stop switch can adapt to the working voltage range of the subsequent module. The Schmitt inverter converts the input voltage into a clean and noise-free high-low level signal. The function of the Schmitt inverter is to ensure that the high-low level conversion of the signal is clean and reliable, even when the input signal has slight fluctuations.

[0026] In the embodiment, the input end D of the D flip-flop 410 is connected to a low level. The D flip-flop is a commonly used timing element in digital circuits, and its output is controlled by the clock signal. When the clock signal changes (e.g., rising edge trigger), the D flip-flop transmits the value of the input end D to the output end Q and maintains this value until the next clock edge arrives. The input end D of the D flip-flop is grounded (logic low level). Therefore, when the rising edge of the emergency stop signal triggers, the D flip-flop outputs a logic low level.

[0027] The working principle of the emergency stop switch self-locking control device provided in the embodiment is as follows:

[0028] When the emergency stop switch is pressed, the voltage across the switch changes. Specifically, the emergency stop switch is connected to a clock signal capture unit, which is responsible for converting the physical pressing action of the emergency stop switch into a voltage signal. This voltage signal is adjusted by a voltage dividing network (composed of resistors R1 and R2) to ensure that it is within the operating range of a Schmitt inverter. The role of the Schmitt inverter is to ensure that a stable rising edge signal is generated when the emergency stop switch is pressed by controlling the upper and lower level thresholds of the input signal. The Schmitt inverter is characterized by its strong anti-interference ability to noise and fluctuations in the input signal, and can convert any unstable input signal into clean high and low level outputs. This rising edge signal is connected to the clock input of a D flip-flop. Since the D terminal of the D flip-flop is connected to a low level, when the rising edge of the clock signal arrives, the D flip-flop will output a logic low level to the Q terminal. When the Q terminal of the D flip-flop outputs a low level signal, the signal is sent to the switch driving module. The switch driving module converts the low level signal into the action of disconnecting the relay or electronic switch, stopping the operation of the device. Specifically, the low level signal will control the shutdown of the device power supply, ensuring that the device stops running immediately. Due to the characteristics of the D flip-flop, after the emergency stop signal is triggered, the D flip-flop will maintain its state, and even if the emergency stop switch is released, the output of the D flip-flop will not change. Therefore, the system enters a self-locking state. The device will remain in a stopped state until it is manually reset.

[0029] In this embodiment, the high voltage input (such as 24V or 48V DC voltage) of the emergency stop switch is ensured to be reasonably divided by R1 and R2 voltage dividing resistors, and then adapted to the voltage range of the Schmitt inverter. This can ensure that the Schmitt inverter correctly converts the signal to high and low levels. The Schmitt inverter has strong noise suppression ability, which can ensure the stability of the signal when the emergency stop switch is actuated, avoiding the risk of system malfunction due to electrical noise or signal fluctuations. The self-locking function of the D flip-flop ensures that the device remains in a stopped state after the emergency stop operation, avoiding the risk of automatic start of the system after a false operation or power recovery. Through the above design, the emergency stop switch self-locking control device can quickly and safely stop the operation of the device in an emergency. The combination of the D flip-flop and the Schmitt inverter ensures the accuracy and stability of the signal, and the self-locking function ensures that the device will not restart due to a false operation after an emergency stop.

[0030] Embodiment Two

[0031] Figure 3 The circuit structure schematic diagram of the emergency stop switch self-locking control device provided in Embodiment Two of the utility model is shown. The difference from Embodiment One is that, as shown in Figure 3As shown, in this embodiment, the input D of the D flip-flop 410 is connected to a high level, and the switch driving signal generation module 400 further includes a NOT gate 430 connected between the output Q of the D flip-flop 410 and the input of the switch driving module 300. In this embodiment, the input D of the D flip-flop is connected to a high level, and every time the clock signal arrives, the D flip-flop will pass the high level to the output Q. Therefore, the Q end of the D flip-flop will output a high level at the rising edge of each clock signal. The Q end of the D flip-flop is connected to the switch driving module through a NOT gate. The function of the NOT gate is to convert the high level signal of the D flip-flop into a low level signal. In this way, when the Q end of the D flip-flop outputs a high level, the NOT gate will convert it to a low level, thereby triggering the switch driving module to disconnect the relay or electronic switch.

[0032] The working principle of the emergency stop switch self-locking control device provided by the embodiment is as follows:

[0033] When the emergency stop switch is pressed, the clock signal capture unit converts it into a rising edge pulse, and the Schmitt NOT gate converts it into a clear high-low level signal. When the rising edge of the clock signal arrives, the D flip-flop passes the high level of the input D to the output Q, and the Q end outputs a high level. The high level of the Q end is converted to a low level through the NOT gate. The low level signal of the NOT gate controls the switch driving module to disconnect the relay or electronic switch, so that the device stops running. Since the D flip-flop will maintain its output state after receiving the rising edge trigger, even if the emergency stop switch is released, the output of the D flip-flop remains high, and the device remains in a stopped state. The system needs to manually reset to restart the device, and the state of the flip-flop can be cleared to restore normal operation.

[0034] In this embodiment, by connecting the input of the D flip-flop to a high level, it is ensured that the rising edge of each clock signal can trigger the D flip-flop to output a high level, thereby generating a continuous high level signal in the system. This design makes the system have the characteristics of self-locking. The use of the NOT gate inverts the high level output of the D flip-flop to a low level, thereby better controlling the switch driving module and ensuring the disconnection of the relay or electronic switch. Since the input of the D flip-flop is connected to a high level, the output of the flip-flop will not change with the release of the emergency stop switch, which enhances the self-locking feature of the system and avoids misoperation. Through the introduction of the NOT gate, the design can flexibly control the inversion of the signal to ensure the correct operation of the relay or electronic switch. Therefore, by connecting a high level to the input of the D flip-flop and introducing the NOT gate to invert the signal, the stability and reliability of the system are enhanced.

[0035] The emergency stop switch self-locking control device provided by the utility model has the following advantages:

[0036] 1. The device can prevent the equipment from automatically resuming work after the emergency stop switch is mistakenly unlocked in actual application; especially in occasions that require strict control of equipment operation, such as production lines, automation control systems, robot systems, etc., the device can effectively avoid the safety hazards caused by equipment restart, such as mechanical damage, operator injury, etc.

[0037] 2. Compared with the traditional emergency stop switch, the operation of the device is more intuitive and simple, and the process of equipment power recovery only needs to reset the switch driving signal generation module, and the operator does not need to perform complex steps, which improves the usability of the system and reduces the possibility of operation errors.

[0038] 3. Since the device reduces the risk of equipment damage caused by misoperation through the self-locking mechanism, the maintenance and maintenance cost of the equipment can be reduced; for high-risk industries or equipment, this technology provides long-term protection and reduces the probability of equipment failure caused by misoperation.

[0039] Each of the descriptions provided herein describes a large number of specific details. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present description.

[0040] Similarly, it should be understood that, in order to simplify the disclosure and help understand one or more of the various aspects of the application, various features of the application are sometimes grouped together in a single embodiment, figure, or description thereof in the above description of exemplary embodiments of the application. However, the method of this disclosure should not be interpreted as reflecting the intention that the claimed application requires more features than the features explicitly recited in each claim. Rather, as reflected in the following claims, the aspects of the application are based on less than all the features of the single embodiment disclosed earlier. Therefore, the claims following the specific embodiments are hereby expressly incorporated into this specific embodiment, wherein each claim itself is a separate embodiment of the application.

[0041] In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the application and forms different embodiments. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

[0042] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and alternative embodiments can be designed by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs located between parentheses shall not be construed as limiting the claims. The word comprising does not exclude the presence of elements or steps not listed in the claims. The word a or an preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and the present application can be implemented by means of a suitably programmed computer. In a unit claim enumerating several means, the several means can be embodied by one and the same item of hardware. The use of the words first, second and third, etc. do not imply any order. These words can be understood as names.

Claims

1. A self-locking control device for an emergency stop switch, connected to an emergency stop switch (100), characterized in that, The device includes a switch (200), a switch drive module (300), and a switch drive signal generation module (400). The switch (200) is connected between the emergency stop switch (100) and the controlled device. The input terminal of the switch drive signal generation module (400) is connected to the emergency stop switch (100), and the output terminal of the switch drive signal generation module (400) is connected to the input terminal of the switch drive module (300). The output terminal of the switch drive module (300) is connected to the control terminal of the switch (200). When the emergency stop switch (100) is detected to be pressed, the switch drive signal generation module (400) generates a drive signal and sends it to the switch drive module (300). The switch drive module (300) controls the switch (200) to remain open.

2. The emergency stop switch self-locking control device according to claim 1, characterized in that, The switch drive signal generation module (400) includes a D flip-flop (410) and a clock signal capture unit (420). The input terminal of the clock signal capture unit (420) is connected to the emergency stop switch (100), and the output terminal of the clock signal capture unit (420) is connected to the clock signal terminal CLK of the D flip-flop (410). The output terminal Q of the D flip-flop (410) is connected to the input terminal of the switch drive module (300). When the emergency stop switch (100) is pressed, the clock signal capture unit (420) generates an edge pulse signal. Under the control of the edge pulse signal, the D flip-flop (410) outputs the level of the input terminal D of the D flip-flop (410) to the switch drive module (300).

3. The emergency stop switch self-locking control device according to claim 2, characterized in that, The clock signal acquisition unit (420) includes a first voltage divider resistor R1, a second voltage divider resistor R2, and a Schmitt-N gate (4201). The first end of the first voltage divider resistor R1 is connected to the emergency stop switch (100). The second end of the first voltage divider resistor R1 is connected to the first end of the second voltage divider resistor R2 and the input terminal of the Schmitt-N gate (4201). The output terminal of the Schmitt-N gate (4201) is connected to the clock signal terminal CLK of the D flip-flop. The second end of the second voltage divider resistor R2 is grounded.

4. The emergency stop switch self-locking control device according to claim 2, characterized in that, The input terminal D of the D flip-flop (410) is connected to a low level.

5. The emergency stop switch self-locking control device according to claim 2, characterized in that, The input terminal D of the D flip-flop (410) is connected to a high level. The switch drive signal generation module (400) also includes an NOT gate (430), which is connected between the output terminal Q of the D flip-flop (410) and the input terminal of the switch drive module (300).

6. The emergency stop switch self-locking control device according to claim 1, characterized in that, The switching device (200) is an electronic switch or a relay.

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