Hot press safety circuit and hot press system

Abstract

The utility model relates to a hot press safety circuit and a hot press system.The hot press safety circuit comprises a control voltage switching circuit, an emergency stop safety circuit and a protection enabling circuit, the first end of the control voltage switching circuit is used for being connected with a power source, and the second end of the control voltage switching circuit is connected with the first end of the emergency stop safety circuit; and the second end of the emergency stop safety circuit is connected with the hot press through a normally open contact of the vacuum door. The first end of the protection enabling circuit is connected with the second end of the emergency stop safety circuit, and the second end of the protection enabling circuit is connected with the hot press through a normally-closed contact of the vacuum door. The control voltage switch circuit is switched on when receiving control voltage, the emergency stop safety circuit is switched on when not receiving an emergency stop signal, the protection enable circuit is switched on when receiving a protection signal or an enable signal, and when the vacuum door is closed, a normally open contact of the vacuum door is closed, and a normally closed contact of the vacuum door is switched off. According to the scheme, a hardware safety circuit is adopted, the operation reliability is high, and the safety performance of the hot press is improved.

Description

Technical Field

[0001] The present application relates to the technical field of hot presses, and in particular to a hot press safety circuit and a hot press system. Background Art

[0002] In the PCB lamination production line system, the heat press is an important component. The heat press is a device that heats two pre-fluxed and tinned parts to a temperature sufficient to melt and flow the solder, and after solidification, forms a permanent electrical and mechanical connection between the parts and the solder.

[0003] In order to ensure the working performance of the heat press, the heat press is usually equipped with an electronic control system to control the working state of the heat press. The traditional electronic control method of the heat press mainly adopts software control, but software control has the risk of freezing or operating failure, resulting in control failure and even further affecting the normal operation of the heat press. Therefore, the traditional electronic control method of the heat press is unreliable. Summary of the invention

[0004] Based on this, it is necessary to provide a heat press safety circuit and a heat press system that are reliable in use.

[0005] A safety circuit for a hot press comprises: a control voltage switch circuit, an emergency stop safety circuit and a protection enable circuit, wherein a first end of the control voltage switch circuit is used to connect to a power supply, a second end of the control voltage switch circuit is connected to a first end of the emergency stop safety circuit, and a second end of the emergency stop safety circuit is connected to a hot press through a normally open contact of a vacuum door; a first end of the protection enable circuit is connected to a second end of the emergency stop safety circuit, and a second end of the protection enable circuit is connected to a hot press through a normally closed contact of a vacuum door;

[0006] The control voltage switch circuit is turned on when the control voltage is received, the emergency stop safety circuit is turned on when no emergency stop signal is received, the protection enable circuit is turned on when a protection signal or an enable signal is received, and when the vacuum door is closed, the normally open contact of the vacuum door is closed and the normally closed contact of the vacuum door is disconnected.

[0007] In one embodiment, the emergency stop safety circuit includes an emergency stop switch and an emergency stop delay switch; the emergency stop switch is disconnected when receiving an emergency stop signal, and the emergency stop delay switch is disconnected after receiving the emergency stop signal;

[0008] The first end of the emergency stop switch is connected to the second end of the control voltage switch circuit, and the second end of the emergency stop switch is connected to the solenoid valve of the hydraulic station of the hot press through the normally open contact of the vacuum door;

[0009] The first end of the emergency stop delay switch is used to connect to a power source, and the second end of the emergency stop delay switch is connected to a motor brake system of the heat press.

[0010] In one embodiment, the emergency stop safety circuit also includes an emergency stop safety relay, the coil of the emergency stop safety relay is used to receive an emergency stop signal, the normally open contact of the emergency stop safety relay is connected to the emergency stop switch, and the delayed normally open contact of the emergency stop safety relay is connected to the emergency stop delay switch.

[0011] In one embodiment, the protection enabling circuit includes a protection door safety circuit and a trolley enabling circuit, the protection door safety circuit and the trolley enabling circuit are connected in parallel, the first end after parallel connection is connected to the second end of the emergency stop safety circuit, and the second end after parallel connection is connected to the hot press through the normally closed contact of the vacuum door; the protection door safety circuit is turned on when receiving a protection signal, and the trolley enabling circuit is turned on when receiving an enable signal.

[0012] In one embodiment, the protective door safety circuit includes a protective door switch and a protective door delay switch, and the trolley enabling circuit includes a trolley enabling switch and a trolley enabling delay switch;

[0013] The protective door switch and the trolley enabling switch are connected in parallel, the first end of the parallel connection is connected to the second end of the emergency stop switch, and the second end of the parallel connection is connected to the solenoid valve of the hydraulic station of the hot press through the normally closed contact of the vacuum door;

[0014] The protective door delay switch and the trolley enable delay switch are connected in parallel, and the emergency stop delay switch is connected to the motor brake system of the hot press through the protective door delay switch.

[0015] In one embodiment, the second end of the protective door switch and the trolley enabling switch connected in parallel is also connected to the motor of the vacuum door of the hot press.

[0016] In one embodiment, the protective door safety circuit also includes a protective door safety relay, the coil of the protective door safety relay is used to receive a protection signal, the normally open contact of the protective door safety relay is connected to the protective door switch, and the delayed normally open contact of the protective door safety relay is connected to the protective door delay switch.

[0017] In one embodiment, the trolley enabling circuit also includes an enabling safety relay, the coil of the enabling safety relay is used to receive an enabling signal, the normally open contact of the enabling safety relay is connected to the trolley enabling switch, and the delayed normally open contact of the enabling safety relay is connected to the trolley enabling delay switch.

[0018] In one of the embodiments, the control voltage switch circuit includes an intermediate relay, a coil of the intermediate relay is used to receive the control voltage, and a contact of the intermediate relay is connected to the emergency stop safety circuit.

[0019] A hot press system comprises a hot press and a hot press safety circuit as described in any one of the above embodiments.

[0020] The above-mentioned hot press safety circuit and hot press system, the hot press safety circuit includes a control voltage switch circuit, an emergency stop safety circuit and a protection enable circuit, the first end of the control voltage switch circuit is used to connect to the power supply, the second end of the control voltage switch circuit is connected to the first end of the emergency stop safety circuit, and the second end of the emergency stop safety circuit is connected to the hot press through the normally open contact of the vacuum door; the first end of the protection enable circuit is connected to the second end of the emergency stop safety circuit, and the second end of the protection enable circuit is connected to the hot press through the normally closed contact of the vacuum door; the control voltage switch circuit is turned on when the control voltage is received, the emergency stop safety circuit is turned on when the emergency stop signal is not received, and the protection enable circuit is turned on when the protection signal or the enable signal is received. When the vacuum door is closed, the normally open contact of the vacuum door is closed and the normally closed contact of the vacuum door is disconnected. When the control voltage is not received or the emergency stop signal is received, or when the protection signal and the enable signal are not received, the safety control of the hot press will be triggered to protect the hot press. This scheme adopts a hardware safety circuit to realize the control of the hot press, which is not easy to crash, has high operating reliability, and is conducive to improving the safety performance of the hot press. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] FIG1 is a schematic diagram of a structure block diagram of a safety circuit of a hot press in one embodiment;

[0023] FIG2 is a schematic diagram of a structural block diagram of a safety circuit of a hot press in another embodiment;

[0024] FIG3 is a schematic diagram of the structure of an emergency stop safety circuit in one embodiment;

[0025] FIG4 is a schematic diagram of a structural block diagram of a safety circuit of a heat press machine in another embodiment;

[0026] FIG5 is a schematic diagram of a structural block diagram of a safety circuit of a hot press in another embodiment;

[0027] FIG6 is a schematic diagram of the structure of a protective door safety circuit in one embodiment;

[0028] FIG7 is a schematic diagram of the structure of a trolley enabling circuit in one embodiment;

[0029] FIG8 is a schematic diagram of the structure of a control voltage switch circuit in one embodiment;

[0030] FIG. 9 is a schematic diagram of the structure of a safety circuit of a hot press in one embodiment. DETAILED DESCRIPTION

[0031] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0033] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0034] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0035] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least part of an element” means part or all of an element.

[0036] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0037] In one embodiment, a hot press safety circuit is provided, which is used to control the hot press, and is specifically used to perform safety control on the hot press, such as stopping the hot press from working. As shown in FIG1 , the hot press safety circuit includes a control voltage switch circuit 100, an emergency stop safety circuit 200, and a protection enable circuit 300. The first end of the control voltage switch circuit 100 is used to access the power supply, the second end of the control voltage switch circuit 100 is connected to the first end of the emergency stop safety circuit 200, the second end of the emergency stop safety circuit 200 is connected to the hot press through the normally open contact of the vacuum door, the first end of the protection enable circuit 300 is connected to the second end of the emergency stop safety circuit 200, and the second end of the protection enable circuit 300 is connected to the hot press through the normally closed contact of the vacuum door. The control voltage switch circuit 100 is turned on when receiving the control voltage, the emergency stop safety circuit 200 is turned on when not receiving the emergency stop signal, and the protection enable circuit 300 is turned on when receiving the protection signal or the enable signal. When the vacuum door is closed, the normally open contact of the vacuum door is closed, and the normally closed contact of the vacuum door is disconnected. When the control voltage or emergency stop signal is not received, or the protection signal and enable signal are not received, the safety control of the heat press will be triggered to protect the heat press. This solution uses a hardware safety circuit to control the heat press, which is not prone to crashes and has high operating reliability, which is conducive to improving the safety performance of the heat press.

[0038] Specifically, the first end of the control voltage switch circuit 100 is used to connect to the power supply, the second end of the control voltage switch circuit 100 is connected to the first end of the emergency stop safety circuit 200, and the second end of the emergency stop safety circuit 200 is connected to the hot press through the normally open contact of the vacuum door. Therefore, the control voltage switch circuit 100, the emergency stop safety circuit 200, the normally open contact of the vacuum door and the hot press are a branch, which can be called the first branch.

[0039] The control voltage switch circuit 100 is turned on when receiving the control voltage, and the emergency stop safety circuit 200 is turned on when not receiving the emergency stop signal. When the vacuum door is closed, the normally open contact of the vacuum door is closed. The control voltage switch circuit 100 is disconnected when not receiving the control voltage, and the emergency stop safety circuit 200 is disconnected when receiving the emergency stop signal. When the vacuum door is opened, the normally open contact of the vacuum door is disconnected. The control voltage switch circuit 100 receiving the control voltage indicates that the control voltage and the control voltage switch circuit 100 are both normal. The emergency stop safety circuit 200 can be connected to the emergency stop button. Depending on whether the emergency stop button is pressed, the emergency stop signal may or may not be received. When the emergency stop safety circuit 200 does not receive the emergency stop signal, it is considered that no emergency stop is required at this time. When the vacuum door is closed, it is considered that the hot press can start the vacuum program at this time.

[0040] Therefore, when the control voltage switch circuit 100 receives the control voltage, the emergency stop safety circuit 200 does not receive the emergency stop signal, and the vacuum door is closed, the control voltage switch circuit 100 and the emergency stop safety circuit 200 are both turned on, and the normally open contact of the vacuum door is closed, the hot press can be powered and work normally. On the contrary, if the control voltage switch circuit 100 does not receive the control voltage, or the emergency stop safety circuit 200 receives the emergency stop signal, or the vacuum door is opened, the branch formed by the control voltage switch circuit 100, the emergency stop safety circuit 200, the normally open contact of the vacuum door and the hot press will be disconnected, triggering the safety protection of the hot press, so that the hot press cannot be powered or slows down.

[0041] In addition, the first end of the protection enabling circuit 300 is connected to the second end of the emergency stop safety circuit 200, and the second end of the protection enabling circuit 300 is connected to the hot press through the normally closed contact of the vacuum door. Therefore, the control voltage switch circuit 100, the emergency stop safety circuit 200, the protection enabling circuit 300, the normally closed contact of the vacuum door and the hot press are another branch, which can be called the second branch.

[0042] The control voltage switch circuit 100 is turned on when receiving the control voltage, the emergency stop safety circuit 200 is turned on when not receiving the emergency stop signal, the protection enable circuit 300 is turned on when receiving the protection signal or the enable signal, and when the vacuum door is opened, the normally closed contact of the vacuum door is closed. The control voltage switch circuit 100 is disconnected when not receiving the control voltage, the emergency stop safety circuit 200 is disconnected when receiving the emergency stop signal, the protection enable circuit 300 is disconnected when neither the protection signal nor the enable signal is received, and when the vacuum door is closed, the normally closed contact of the vacuum door is disconnected. The control voltage switch circuit 100 receiving the control voltage indicates that the control voltage and the control voltage switch circuit 100 are both normal. The emergency stop safety circuit 200 can be connected to the emergency stop button, and the emergency stop signal can be received or not received depending on whether the emergency stop button is pressed. When the emergency stop safety circuit 200 does not receive the emergency stop signal, it is considered that no emergency stop is required at this time. The protection enable circuit 300 can be connected to the protection door, and the protection signal can be received or not received depending on the open or closed state of the protection door. Generally, when the protection door is closed, the protection enable circuit 300 receives a protection signal. The protection enable circuit 300 may also be connected to an enable button, and may or may not receive an enable signal depending on whether the enable button is pressed. Generally, when the enable button is pressed, the protection enable circuit 300 receives an enable signal. The enable button may be a trolley enable button, and the trolley is a trolley that can be moved to the hot press. When the vacuum door is opened, considering that the hot press does not start the vacuum program at this time, the hot press may perform other actions that do not require vacuum.

[0043] Therefore, when the control voltage switch circuit 100 receives the control voltage, the emergency stop safety circuit 200 does not receive the emergency stop signal, the protection enable circuit 300 receives the protection signal or the enable signal, and the vacuum door is opened, the control voltage switch circuit 100, the emergency stop safety circuit 200 and the protection enable circuit 300 are all turned on, and the normally closed contacts of the vacuum door are closed, the hot press can be powered and work normally. On the contrary, if the control voltage switch circuit 100 does not receive the control voltage, or the emergency stop safety circuit 200 receives the emergency stop signal, or the protection enable circuit 300 does not receive the protection signal and the enable signal, or the vacuum door is closed, the branch formed by the control voltage switch circuit 100, the emergency stop safety circuit 200, the protection enable circuit 300, the normally closed contacts of the vacuum door and the hot press will be disconnected, triggering the safety protection of the hot press, so that the hot press cannot be powered or slows down.

[0044] The above-mentioned hot press safety circuit realizes the safety control of the hot press based on the hardware architecture. Compared with the software control method, it is not easy to find faults such as freezing, and the working reliability is high.

[0045] In one embodiment, as shown in FIG2 , the emergency stop safety circuit 200 includes an emergency stop switch 210 and an emergency stop delay switch 220. The emergency stop switch 210 is disconnected when receiving an emergency stop signal, and the emergency stop delay switch 220 is disconnected after receiving the emergency stop signal. The first end of the emergency stop switch 210 is connected to the second end of the control voltage switch circuit 100, and the second end of the emergency stop switch 210 is connected to the solenoid valve of the hydraulic station of the hot press through the normally open contact of the vacuum door. The first end of the emergency stop delay switch 220 is used to connect to the power supply, and the second end of the emergency stop delay switch 220 is connected to the motor brake system of the hot press.

[0046] The emergency stop safety circuit 200 includes an emergency stop switch 210 and an emergency stop delay switch 220. The emergency stop switch 210 and the emergency stop delay switch 220 can be in different branches and connected to different devices of the hot press respectively. For example, in this embodiment, the emergency stop switch 210, the control voltage switch circuit 100, the normally open contact of the vacuum door and the solenoid valve of the hydraulic station of the hot press are in the same branch. The first end of the emergency stop switch 210 is connected to the second end of the control voltage switch circuit 100, and the second end of the emergency stop switch 210 is connected to the solenoid valve of the hydraulic station of the hot press through the normally open contact of the vacuum door. The emergency stop switch 210, the control voltage switch circuit 100, and the normally open contact of the vacuum door jointly control the working state of the solenoid valve of the hydraulic station of the hot press.

[0047] In addition, the emergency stop delay switch 220 and the motor brake system of the hot press are on the same branch line. The first end of the emergency stop delay switch 220 is used to connect to the power supply, and the second end of the emergency stop delay switch 220 is connected to the motor brake system of the hot press. The emergency stop delay switch 220 controls the working state of the motor brake system of the hot press.

[0048] When the emergency stop signal is not received, the emergency stop switch 210 and the emergency stop delay switch 220 are both closed. If other devices on the branch are turned on, the solenoid valve of the hydraulic station of the heat press and the motor brake system of the heat press can work normally. When the emergency stop signal is received, the emergency stop switch 210 is disconnected, triggering the protection of the solenoid valve of the hydraulic station of the heat press, for example, immediately cutting off the power of the solenoid valve of the hydraulic station. In addition, when the emergency stop signal is received, the emergency stop delay switch 220 is disconnected with a delay, so that the motor brake system of the heat press connected to the emergency stop delay switch 220 is delayed to stop, and the brake voltage of the motor is delayed to cut off the power, thereby reducing the impact of hard shutdown on the motor and making the motor stop more reliably. Furthermore, the delay time of the emergency stop delay switch 220 can be set according to actual needs.

[0049] In an extensible manner, the types of the emergency stop switch 210 and the emergency stop delay switch 220 are not unique. For example, the emergency stop switch 210 is a relay, and the emergency stop delay switch 220 is a delay relay. Both the relay and the delay relay can control the conduction or closure of their contacts by controlling the energized state of their coils, which is convenient to use. It is understood that in other embodiments, the emergency stop switch 210 and the emergency stop delay switch 220 can also be other types, as long as those skilled in the art consider it feasible.

[0050] In this embodiment, the emergency stop safety circuit 200 includes an emergency stop switch 210 and an emergency stop delay switch 220. The first end of the emergency stop switch 210 is connected to the second end of the control voltage switch circuit 100, and the second end of the emergency stop switch 210 is connected to the solenoid valve of the hydraulic station of the hot press through the normally open contact of the vacuum door. The first end of the emergency stop delay switch 220 is used to access the power supply, and the second end of the emergency stop delay switch 220 is connected to the motor brake system of the hot press. The emergency stop switch 210 is disconnected when receiving the emergency stop signal, and the emergency stop delay switch 220 is disconnected after receiving the emergency stop signal. When the emergency stop signal is received, the solenoid valve of the hydraulic station of the hot press can be immediately powered off, and the motor brake system of the hot press can be powered off with a delay, thereby ensuring the safety protection effect and improving the reliability of the motor.

[0051] In one embodiment, as shown in FIG3 , the emergency stop safety circuit 200 further includes an emergency stop safety relay SR1, the coil of the emergency stop safety relay SR1 is used to receive an emergency stop signal, the normally open contacts (13, 14) of the emergency stop safety relay SR1 are connected to the emergency stop switch 210, the emergency stop switch 210 may be a relay KA2, and the delayed normally open contacts (37, 38) of the emergency stop safety relay SR1 are connected to the emergency stop delay switch 220, the emergency stop delay switch 220 may be a relay KA3.

[0052] Specifically, the coil of the emergency stop safety relay SR1 can be connected to the emergency stop button to receive the emergency stop signal. The normally open contact of the emergency stop safety relay SR1 is connected to the emergency stop switch 210, and the delayed normally open contact of the emergency stop safety relay SR1 is connected to the emergency stop delay switch 220. When the emergency stop signal is not received, the coil of the emergency stop safety relay SR1 is energized, the normally open contact of the emergency stop safety relay SR1 and the delayed normally open contact of the emergency stop safety relay SR1 are both closed, and the emergency stop switch 210 and the emergency stop delay switch 220 are both turned on. When the emergency stop signal is received, the coil of the emergency stop safety relay SR1 loses power, the normally open contact of the emergency stop safety relay SR1 and the delayed normally open contact of the emergency stop safety relay SR1 are both disconnected, the emergency stop switch 210 is immediately disconnected, and the emergency stop delay switch 220 is disconnected after a delay.

[0053] In this embodiment, the emergency stop safety circuit 200 further includes an emergency stop safety relay SR1, the coil of the emergency stop safety relay SR1 is used to receive an emergency stop signal, the normally open contact of the emergency stop safety relay SR1 is connected to the emergency stop switch 210, and the delayed normally open contact of the emergency stop safety relay SR1 is connected to the emergency stop delay switch 220. Through the coil and contacts of the emergency stop safety relay SR1, the conduction state of the emergency stop switch 210 and the emergency stop delay switch 220 is controlled according to the emergency stop signal, and the structure is simple.

[0054] In one embodiment, as shown in FIG4 , the protection enabling circuit 300 includes a protection door safety circuit 310 and a trolley enabling circuit 320. The protection door safety circuit 310 and the trolley enabling circuit 320 are connected in parallel, and the first end after the parallel connection is connected to the second end of the emergency stop safety circuit 200, and the second end after the parallel connection is connected to the hot press through the normally closed contact of the vacuum door. The protection door safety circuit 310 is turned on when receiving the protection signal, and the trolley enabling circuit 320 is turned on when receiving the enabling signal.

[0055] Specifically, the protection enabling circuit 300 includes a protection door safety circuit 310 and a trolley enabling circuit 320 connected in parallel. If the emergency stop safety circuit 200 and the control voltage switch circuit 100 are both turned on, when the normally closed contact of the vacuum door is closed, when at least one of the protection door safety circuit 310 and the trolley enabling circuit 320 is turned on, the signal or electric energy can be transmitted to the hot press to enable the hot press to work normally. The protection door safety circuit 310 can be connected to the protection door, and the protection signal can be received or not received according to the open or closed state of the protection door. Generally, when the protection door is closed, the protection door safety circuit 310 receives the protection signal. The trolley enabling circuit 320 can be connected to the enable button, and the enable signal can be received or not received according to the different states of whether the enable button is pressed. Generally, when the enable button is pressed, the trolley enabling circuit 320 receives the enable signal. The protection door safety circuit 310 is turned on when receiving the protection signal, and the trolley enabling circuit 320 is turned on when receiving the enable signal. That is, when the protective door safety circuit 310 receives a protective signal, or the trolley enable circuit 320 receives an enable signal, or the protective door safety circuit 310 receives a protective signal and the trolley enable circuit 320 receives an enable signal, if the emergency stop safety circuit 200 and the control voltage switch circuit 100 are both turned on and the normally closed contacts of the vacuum door are closed, signals or electrical energy can be transmitted to the hot press to enable the hot press to work normally.

[0056] In this embodiment, the protection enabling circuit 300 includes a protection door safety circuit 310 and a trolley enabling circuit 320. The protection door safety circuit 310 and the trolley enabling circuit 320 are connected in parallel, and the first end after parallel connection is connected to the second end of the emergency stop safety circuit 200, and the second end after parallel connection is connected to the hot press through the normally closed contact of the vacuum door. The protection door safety circuit 310 is turned on when receiving a protection signal, and the trolley enabling circuit 320 is turned on when receiving an enabling signal. The protection door safety circuit 310 and the trolley enabling circuit 320 can control their own conduction states according to whether a protection signal and an enabling signal are received, respectively, so as to realize the control of the working state of the hot press.

[0057] In one embodiment, as shown in FIG5 , the protective door safety circuit 310 includes a protective door switch 312 and a protective door delay switch 314, and the trolley enable circuit 320 includes a trolley enable switch 322 and a trolley enable delay switch 324. The protective door switch 312 and the trolley enable switch 322 are connected in parallel, and the first end after the parallel connection is connected to the second end of the emergency stop switch 210, and the second end after the parallel connection is connected to the solenoid valve of the hydraulic station of the hot press through the normally closed contact of the vacuum door. The protective door delay switch 314 and the trolley enable delay switch 324 are connected in parallel, and the emergency stop delay switch 220 is connected to the motor brake system of the hot press through the protective door delay switch 314.

[0058] The parallel structure of the protective door switch 312 and the trolley enabling switch 322 is connected to the solenoid valve of the hydraulic station of the hot press through the normally closed contact of the vacuum door, and the parallel structure of the protective door delay switch 314 and the trolley enabling delay switch 324 is connected to the motor brake system of the hot press. In addition, the emergency stop delay switch 220 is connected to the motor brake system of the hot press through the protective door delay switch 314, and the emergency stop delay switch 220, the protective door delay switch 314 and the motor brake system are on a branch line.

[0059] The protection door switch 312 and the trolley enable switch 322 are connected in parallel, and the first end after parallel connection is connected to the second end of the emergency stop switch 210, and the second end after parallel connection is connected to the solenoid valve of the hydraulic station of the hot press through the normally closed contact of the vacuum door. When receiving the protection signal, the protection door switch 312 and the protection door delay switch 314 are both closed. If other devices on the branch are turned on, the solenoid valve of the hydraulic station of the hot press and the motor brake system of the hot press can work normally. When receiving the enable signal, the trolley enable switch 322 and the trolley enable delay switch 324 are both closed. If other devices on the branch are turned on, the solenoid valve of the hydraulic station of the hot press and the motor brake system of the hot press can work normally. When the protection signal is interrupted, the protection door switch 312 is immediately disconnected, and the protection door delay switch 314 is disconnected with a delay. When the enable signal is interrupted, the trolley enable switch 322 is immediately disconnected, and the trolley enable delay switch 324 is disconnected with a delay. Thus, the motor brake system of the hot press is delayed to stop, the brake voltage of the motor is delayed to cut off, the influence of hard shutdown on the motor is reduced, and the motor is stopped more reliably. Furthermore, the delay time of the protection door delay switch 314 and the trolley enable delay switch 324 can be set according to actual needs.

[0060] In an extensible manner, the types of the protective door switch 312, the protective door delay switch 314, the trolley enable switch 322 and the trolley enable delay switch 324 are not unique. For example, the protective door switch 312 and the trolley enable switch 322 are both relays, and the protective door delay switch 314 and the trolley enable delay switch 324 are both delay relays. Both the relay and the delay relay can control the conduction or closure of their contacts by controlling the energized state of their coils, which is convenient to use. It can be understood that in other embodiments, the protective door switch 312, the protective door delay switch 314, the trolley enable switch 322 and the trolley enable delay switch 324 can also be of other types, as long as those skilled in the art believe that it can be implemented.

[0061] In this embodiment, the protective door safety circuit 310 includes a protective door switch 312 and a protective door delay switch 314, and the trolley enable circuit 320 includes a trolley enable switch 322 and a trolley enable delay switch 324. The protective door switch 312 and the trolley enable switch 322 are connected in parallel, and the first end after parallel connection is connected to the second end of the emergency stop switch 210, and the second end after parallel connection is connected to the solenoid valve of the hydraulic station of the hot press through the normally closed contact of the vacuum door. The protective door delay switch 314 and the trolley enable delay switch 324 are connected in parallel, and the emergency stop delay switch 220 is connected to the motor brake system of the hot press through the protective door delay switch 314. When the protective signal is interrupted, the protective door switch 312 is immediately disconnected, and the protective door delay switch 314 is disconnected with a delay. When the enable signal is interrupted, the trolley enable switch 322 is immediately disconnected, and the trolley enable delay switch 324 is disconnected with a delay. When the protection signal and the enable signal are interrupted, the solenoid valve of the hydraulic station of the hot press can be immediately powered off, and the motor brake system of the hot press can be delayed to power off, thereby ensuring the safety protection effect and improving the reliability of the motor.

[0062] In one embodiment, the second end of the protective door switch 312 and the trolley enable switch 322 connected in parallel is also connected to the motor of the vacuum door of the heat press. When at least one of the protective door switch 312 and the trolley enable switch 322 is closed, if other devices on the branch are turned on, the motor of the vacuum door of the heat press can work normally. When the protective signal and the enable signal are interrupted, the protective door switch 312 and the trolley enable switch 322 are immediately disconnected, so that the motor of the vacuum door of the heat press is immediately powered off, and the response speed is fast.

[0063] In one embodiment, as shown in FIG6 , the protective door safety circuit 310 further includes a protective door safety relay SR2, the coil of the protective door safety relay SR2 is used to receive a protective signal, the normally open contacts (13, 14) of the protective door safety relay SR2 are connected to the protective door switch 312, the protective door switch 312 may be a relay KA4, the delayed normally open contacts (37, 38) of the protective door safety relay SR2 are connected to the protective door delay switch 314, the protective door delay switch 314 may be a relay KA5.

[0064] Specifically, the coil of the protective door safety relay SR2 can be connected to the protective door for receiving the protective signal. The normally open contact of the protective door safety relay SR2 is connected to the protective door switch 312, and the delayed normally open contact of the protective door safety relay SR2 is connected to the protective door delay switch 314. When the protective signal is received, the coil of the protective door safety relay SR2 is energized, the normally open contact of the protective door safety relay SR2 and the delayed normally open contact of the protective door safety relay SR2 are both closed, and the protective door switch 312 and the emergency stop delay switch 220 are both turned on. When the protective signal is not received, the coil of the protective door safety relay SR2 loses power, the normally open contact of the protective door safety relay SR2 and the delayed normally open contact of the emergency stop safety relay SR1 are both disconnected, the protective door switch 312 is immediately disconnected, and the protective door delay switch 314 is disconnected after a delay.

[0065] In this embodiment, the protection door safety circuit 310 also includes a protection door safety relay SR2, the coil of the protection door safety relay SR2 is used to receive the protection signal, the normally open contact of the protection door safety relay SR2 is connected to the protection door switch 312, and the delayed normally open contact of the protection door safety relay SR2 is connected to the protection door delay switch 314. Through the coil and contact of the protection door safety relay SR2, the conduction state of the protection door switch 312 and the protection door delay switch 314 is controlled according to the protection signal, and the structure is simple.

[0066] In one embodiment, as shown in FIG. 7 , the trolley enabling circuit 320 further includes an enabling safety relay SR3, the coil of the enabling safety relay SR3 is used to receive an enabling signal, the normally open contacts (13, 14) of the enabling safety relay SR3 are connected to the trolley enabling switch 322, the trolley enabling switch 322 may be a relay KA6, and the delayed normally open contacts (37, 38) of the enabling safety relay SR3 are connected to the trolley enabling delay switch 324, the trolley enabling delay switch 324 may be a relay KA7.

[0067] Specifically, the coil of the enabling safety relay SR3 can be connected to the enabling button for receiving the enabling signal. The normally open contact of the enabling safety relay SR3 is connected to the trolley enabling switch 322, and the delayed normally open contact of the enabling safety relay SR3 is connected to the trolley enabling delay switch 324. When the enabling signal is received, the coil of the enabling safety relay SR3 is energized, the normally open contact of the enabling safety relay SR3 and the delayed normally open contact of the enabling safety relay SR3 are both closed, and the trolley enabling switch 322 and the trolley enabling delay switch 324 are both turned on. When the enabling signal is not received, the coil of the enabling safety relay SR3 is de-energized, the normally open contact of the enabling safety relay SR3 and the delayed normally open contact of the enabling safety relay SR3 are both disconnected, the trolley enabling switch 322 is immediately disconnected, and the trolley enabling delay switch 324 is disconnected after a delay.

[0068] In this embodiment, the trolley enabling circuit 320 further includes an enabling safety relay SR3, the coil of the enabling safety relay SR3 is used to receive an enabling signal, the normally open contact of the enabling safety relay SR3 is connected to the trolley enabling switch 322, and the delayed normally open contact of the enabling safety relay SR3 is connected to the trolley enabling delay switch 324. By enabling the coil and contact of the safety relay SR3, the conducting state of the trolley enabling switch 322 and the trolley enabling delay switch 324 is controlled according to the enabling signal, and the structure is simple.

[0069] In one embodiment, as shown in FIG. 8 , the control voltage switch circuit 100 includes an intermediate relay KA1 , a coil of the intermediate relay KA1 is used to receive the control voltage, and a contact of the intermediate relay KA1 is connected to the emergency stop safety circuit 200 .

[0070] Specifically, the coil of the intermediate relay KA1 is used to receive the control voltage, and the contacts (11, 12) of the intermediate relay are connected to the emergency stop safety circuit 200. When the control voltage is received, the coil of the intermediate relay KA1 is energized, and the contacts of the intermediate relay KA1 are turned on, so that signals and electric energy can be transmitted to the emergency stop safety circuit 200.

[0071] In this embodiment, the control voltage switch circuit 100 includes an intermediate relay, the coil of the intermediate relay is used to receive the control voltage, and the contact of the intermediate relay is connected to the emergency stop safety circuit 200. Through the coil and contact of the intermediate relay, the conduction state of the contact of the intermediate relay is controlled according to the control voltage, and the structure is simple.

[0072] In one embodiment, a heat press system is provided, comprising a heat press and the heat press safety circuit of any one of the above embodiments.

[0073] In order to better understand the above embodiment, a detailed explanation is given below in conjunction with a specific embodiment. In one embodiment, the hot press safety circuit includes a control voltage switch circuit 100, an emergency stop safety circuit 200 and a protection enable circuit 300, and the protection enable circuit 300 includes a protection door safety circuit 310 and a trolley enable circuit 320.

[0074] As shown in FIG8 , the control voltage switch circuit 100 includes an intermediate relay KA1. When the control voltage normally open button SB2 is pressed, the coil of the intermediate relay KA1 is energized, and the contacts of the intermediate relay, namely the auxiliary normally open contacts 11 and 12, are closed to realize the self-locking of the KA1 coil. When the control voltage normally closed button SB1 is pressed, the coil of the intermediate relay KA1 is de-energized.

[0075] As shown in FIG3 , the emergency stop safety circuit 200 includes an emergency stop switch 210, an emergency stop delay switch 220, and an emergency stop safety relay SR1. Among them, the emergency stop switch 210 is a relay KA2, and the emergency stop delay switch 220 is a relay KA3. When the emergency stop button SE does not work, the coil of the safety relay SR1 is energized, its normally open contacts 13 and 14 are closed, the power-off delay normally open contacts 37 and 38 are immediately closed, and the coils of the relays KA2 and KA3 are energized; when the emergency stop button SE is pressed, the coil of the safety relay SR1 is de-energized, its normally open contacts 13 and 14 are immediately disconnected, the power-off delay normally open contacts 37 and 38 are disconnected after a delay of 3 seconds, the coil of the relay KA2 is immediately de-energized, and the coil of the relay KA3 is de-energized after a delay of 3 seconds.

[0076] As shown in FIG6 , the protective door safety circuit 310 includes a protective door switch 312, a protective door delay switch 314, and a protective door safety relay SR2. Among them, the protective door switch 312 is a relay KA4, and the protective door delay switch 314 is a relay KA5. When the fence protective door is closed, the electromagnetic switch PT is in a normally closed state, the safety relay SR2 coil is energized, its normally open contacts 13 and 14 are closed, the power-off delay normally open contacts 37 and 38 are immediately closed, and the relay KA4 and KA5 coils are energized. When the fence protective door is opened, the electromagnetic switch PT is activated, the safety relay SR2 coil is de-energized, its normally open contacts 13 and 14 are immediately disconnected, the power-off delay normally open contacts 37 and 38 are disconnected after a delay of 3 seconds, the relay KA4 coil is immediately de-energized, and the relay KA5 coil is de-energized after a delay of 3 seconds.

[0077] As shown in FIG7 , the trolley enabling circuit 320 includes a trolley enabling switch 322, a trolley enabling delay switch 324, and an enabling safety relay SR3. The trolley enabling switch 322 is a relay KA6, the trolley enabling delay switch 324 is a relay KA7, and the enabling safety relay SR3 is a safety relay SR3. When the trolley enabling button SB3 is not actuated, the safety relay SR3 is not energized, and its normally open contacts 13, 14, and the power-off delay normally open contacts 37, 38 are all in the disconnected state, and the relays K6 and K7 coils are not energized. When the trolley enabling button SB is pressed, the safety relay SR3 coil is energized, its normally open contacts 13, 14 are closed, and the power-off delay normally open contacts 37, 38 are immediately closed, and the relays KA6 and KA7 coils are immediately energized. The moment the trolley button is released, the coil of safety relay SR3 loses power, its normally open contacts 13 and 14 are disconnected immediately, the power-off delay normally open contacts 37 and 38 are disconnected after a delay of 3 seconds, the coil of relay KA6 loses power immediately, and the coil of relay KA7 loses power after a delay of 3 seconds.

[0078] As shown in Figure 8, when the contacts of the intermediate relay KA1 are closed and the emergency stop button is not pressed, the coils of the relays KA2 and KA3 are energized, and their auxiliary normally open contacts 1 and 2 are closed; the vacuum door is closed, the auxiliary normally open contacts 1 and 2 of the relay KA8 are closed, and the auxiliary normally closed contacts 51 and 52 are disconnected, and the solenoid valves of the hydraulic station are powered normally and perform related actions; the fence protection door system is closed, the coils of KA4 and KA5 are energized, and their auxiliary normally open contacts 1 and 2 are closed, the vacuum door is not closed, the auxiliary normally open contacts 1 and 2 of KA8 are in the normally open state, and the auxiliary normally closed contacts 51 and 52 are in the closed state, the solenoid valves of the hydraulic station are powered normally and perform related actions, and the motors of the vacuum doors are powered on and perform related actions; when the fence protection door system is opened, the coil of KA4 loses power immediately, and the auxiliary normally open contacts 1 and 2 immediately resume normal operation. In the open state, the KA5 coil loses power after a delay of 3S, and its auxiliary normally open contacts 1 and 2 are closed. The vacuum door is not closed, the solenoid valve of the hydraulic station is immediately powered off, the motor of the vacuum door is immediately powered off, and the motor brake system is powered off after a delay of 3S; when the trolley enabling button is pressed, the KA6 and KA7 coils are energized, and their auxiliary normally open contacts 1 and 2 are closed. The vacuum door is not closed, the auxiliary normally open contacts 1 and 2 of KA8 are normally open, and the auxiliary normally closed contacts 51 and 52 are closed. The solenoid valve of the hydraulic station is powered normally and performs related actions, and the motor of the vacuum door is powered on and performs related actions; when the trolley enabling button is pressed and released, the KA6 coil loses power immediately, and the KA7 coil is powered off after a delay of 3S. When the vacuum door is not closed, the hydraulic station is immediately powered off, the motor of the vacuum door is immediately powered off, and the motor brake system is powered off after a delay of 3S. When the control voltage KA1 is turned off, the emergency stop button is pressed, the KA2 coil loses power immediately, the KA3 coil loses power after a delay of 3S, the vacuum door is not closed, the hydraulic station loses power immediately, the vacuum door motor loses power immediately, and the motor brake system loses power after a delay of 3S.

[0079] The above-mentioned heat press machine safety circuit adopts a hardware safety circuit, which realizes the emergency stop of the equipment through the hardware safety circuit, and can ensure the machine safety and personal safety of the heat press machine.

[0080] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0081] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A heat press safety circuit, characterized in that: include: A control voltage switch circuit, an emergency stop safety circuit and a protection enable circuit, wherein the first end of the control voltage switch circuit is used to access a power supply, the second end of the control voltage switch circuit is connected to the first end of the emergency stop safety circuit, and the second end of the emergency stop safety circuit is connected to a hot press through a normally open contact of a vacuum door; the first end of the protection enable circuit is connected to the second end of the emergency stop safety circuit, and the second end of the protection enable circuit is connected to a hot press through a normally closed contact of a vacuum door; The control voltage switch circuit is turned on when the control voltage is received, the emergency stop safety circuit is turned on when no emergency stop signal is received, the protection enable circuit is turned on when a protection signal or an enable signal is received, and when the vacuum door is closed, the normally open contact of the vacuum door is closed and the normally closed contact of the vacuum door is disconnected.

2. The hot press safety circuit according to claim 1, characterized in that: The emergency stop safety circuit includes an emergency stop switch and an emergency stop delay switch; the emergency stop switch is disconnected when receiving an emergency stop signal, and the emergency stop delay switch is disconnected after receiving the emergency stop signal; The first end of the emergency stop switch is connected to the second end of the control voltage switch circuit, and the second end of the emergency stop switch is connected to the solenoid valve of the hydraulic station of the hot press through the normally open contact of the vacuum door; The first end of the emergency stop delay switch is used to connect to a power source, and the second end of the emergency stop delay switch is connected to a motor brake system of the heat press.

3. The hot press safety circuit according to claim 2, characterized in that: The emergency stop safety circuit also includes an emergency stop safety relay, the coil of the emergency stop safety relay is used to receive an emergency stop signal, the normally open contact of the emergency stop safety relay is connected to the emergency stop switch, and the delayed normally open contact of the emergency stop safety relay is connected to the emergency stop delay switch.

4. The hot press safety circuit according to claim 2, characterized in that: The protection enabling circuit includes a protection door safety circuit and a trolley enabling circuit. The protection door safety circuit and the trolley enabling circuit are connected in parallel, and the first end after parallel connection is connected to the second end of the emergency stop safety circuit, and the second end after parallel connection is connected to the hot press through the normally closed contact of the vacuum door; the protection door safety circuit is turned on when receiving a protection signal, and the trolley enabling circuit is turned on when receiving an enabling signal.

5. The hot press safety circuit according to claim 4, characterized in that: The protection door safety circuit includes a protection door switch and a protection door delay switch, and the trolley enabling circuit includes a trolley enabling switch and a trolley enabling delay switch; The protective door switch and the trolley enabling switch are connected in parallel, the first end of the parallel connection is connected to the second end of the emergency stop switch, and the second end of the parallel connection is connected to the solenoid valve of the hydraulic station of the hot press through the normally closed contact of the vacuum door; The protective door delay switch and the trolley enable delay switch are connected in parallel, and the emergency stop delay switch is connected to the motor brake system of the hot press through the protective door delay switch.

6. The hot press safety circuit according to claim 5, characterized in that: The second end of the protective door switch and the trolley enabling switch connected in parallel is also connected to the motor of the vacuum door of the hot press.

7. The hot press safety circuit according to claim 5, characterized in that: The protective door safety circuit also includes a protective door safety relay, the coil of the protective door safety relay is used to receive a protection signal, the normally open contact of the protective door safety relay is connected to the protective door switch, and the delayed normally open contact of the protective door safety relay is connected to the protective door delay switch.

8. The hot press safety circuit according to claim 5, characterized in that: The trolley enabling circuit also includes an enabling safety relay, the coil of the enabling safety relay is used to receive an enabling signal, the normally open contact of the enabling safety relay is connected to the trolley enabling switch, and the delayed normally open contact of the enabling safety relay is connected to the trolley enabling delay switch.

9. The hot press safety circuit according to claim 5, characterized in that: The control voltage switch circuit comprises an intermediate relay, the coil of the intermediate relay is used to receive the control voltage, and the contacts of the intermediate relay are connected to the emergency stop safety circuit.

10. A hot press system, characterized in that: The invention comprises a heat press and a heat press safety circuit as claimed in any one of claims 1 to 9.

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