A safety protection device

Abstract

This invention relates to the field of industrial safety technology, and in particular to a safety protection device, comprising a cabinet with an installation port. Baffles are installed on the inner walls of both sides of the installation port near the inner side of the cabinet, and an openable door is provided on the inner wall of the installation port near the outer side of the cabinet. A first type of sensor is disposed between the door and the baffles to detect the opening and closing state of the door and output a first state signal. A second type of sensor is disposed at the installation port to detect intrusion into the area of ​​the installation port and output a second state signal. A safety controller is mounted on the baffles. This invention integrates physical access control sensing and open area photoelectric sensing through the first and second types of sensors, achieving comprehensive protection with both contact and non-contact warnings, thus achieving a dual warning effect to prevent personnel from entering dangerous areas.

Description

Technical Field

[0001] This invention relates to the field of industrial safety technology, and in particular to a safety protection device. Background Technology

[0002] In the industrial manufacturing sector, such as packaging machinery and large experimental equipment, the interior of the cabinets typically contains high-speed, high-pressure, or high-temperature mechanical actuators. Therefore, the interior of the cabinet constitutes a high-risk area during operation. If operators or maintenance personnel enter due to misoperation, lack of concentration, or failure to comply with safety procedures, it can easily lead to serious mechanical injury accidents, causing personal injury and production interruption. Therefore, a safety protection device is required.

[0003] Existing safety protection devices have some shortcomings in use: they rely on physical isolation through door panels and the method of stopping the equipment immediately when the door is opened for safety protection. However, the method of cutting off power when the door is opened sometimes results in the button not being pressed after the door is opened, causing the emergency stop to fail to be triggered, thus rendering the safety protection measures ineffective and the equipment unable to stop.

[0004] Therefore, those skilled in the art have proposed a safety protection device to address the aforementioned problems. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that: sometimes the door opening power-off method results in the button not being pressed after the door is opened, which causes the emergency stop to fail to be triggered.

[0006] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a safety protection device, which includes: The cabinet has an installation opening, and baffles are installed on the inner walls of both sides of the installation opening near the inner side of the cabinet. An openable door panel is provided on the inner wall of the installation opening near the outer side of the cabinet. The first type of sensor is disposed between the door panel and the baffle, and is used to detect the opening and closing state of the door panel and output a first state signal; The second type of sensor is disposed at the mounting port and is used to detect the intrusion status of the mounting port area and output a second status signal. A safety controller is installed on the baffle and is electrically connected to the first type of sensor, the second type of sensor, and the drive unit of the mechanical actuator inside the cabinet, respectively. When the safety controller receives the first status signal or the second status signal, it immediately outputs an emergency stop command to the drive unit of the mechanical actuator inside the cabinet.

[0007] As a preferred embodiment of the safety protection device of the present invention, the baffle has an installation groove on the side of the door panel near the door opening, the first type of sensor is installed inside the installation groove, and the safety controller is installed on the back of the door panel near the installation groove.

[0008] As a preferred embodiment of the safety protection device of the present invention, the first type of sensor includes a limit switch fixed on the inner wall of the bottom of the mounting groove, a telescopic rod fixed at the center of the surface of the limit switch, a spring wound around the outside of the telescopic rod, a pressing plate installed at the top of the telescopic rod, and the pressing plate slidably disposed on the inner wall of the mounting groove. When the pressing plate is not subjected to pressure from the door panel, the bottom end of the pressing plate is attached to the port of the mounting groove.

[0009] As a preferred embodiment of the safety protection device of the present invention, the limit switch has rectangular openings on both sides of its surface, and normally closed contacts are provided on the inner walls of the rectangular openings. The bottom outer wall of the pressing plate has strikers on both sides, and the strikers are located directly above the normally closed contacts. When the pressing plate is subjected to pressure from the door panel, the bottom end of the striker is attached to the surface of the normally closed contact.

[0010] In a preferred embodiment of the safety protection device of the present invention, the safety controller is a safety relay, and the two terminals of the normally closed contact are connected to the input monitoring terminal of the safety relay via wires.

[0011] As a preferred embodiment of the safety protection device of the present invention, the second type of sensor includes a grating transmitter and a grating receiver.

[0012] As a preferred embodiment of the safety protection device of the present invention, a slot is provided on the top inner wall of the mounting port, and the grating emitter is fixed inside the slot.

[0013] As a preferred embodiment of the safety protection device of the present invention, a strip groove is formed on the bottom inner wall of the mounting port, the grating receiver is installed inside the strip groove, and a baffle is horizontally installed at the port of the strip groove.

[0014] As a preferred embodiment of the safety protection device of the present invention, a door handle is installed at one end of the door panel surface.

[0015] As a preferred embodiment of the safety protection device of the present invention, the first type of sensor and the second type of sensor are both connected to the monitoring input terminal of the safety controller through a normally closed safety circuit. The safety controller determines whether the first state signal and the second state signal are issued by monitoring the current on / off state of the normally closed safety circuit in real time.

[0016] The beneficial effects of the safety protection device of the present invention: By integrating physical access control sensing with photoelectric sensing in open areas using both type I and type II sensors, comprehensive protection with both contact and non-contact warnings is achieved. This prevents people from directly entering dangerous areas by opening doors, and also provides a second warning and brake when people's limbs have not fully entered, or are only approaching or obstructing open areas, thus achieving a dual warning effect to prevent people from entering dangerous areas.

[0017] All sensor signals are connected to the same safety controller for centralized processing, avoiding potential response conflicts between multiple independent safety subsystems, and making the entire safety system coordinated, consistent and rapid. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 This is a schematic diagram of the overall structure of a safety protection device.

[0019] Figure 2 This is a schematic diagram of a partially unfolded safety protection device.

[0020] Figure 3 for Figure 2 A magnified structural diagram at point A.

[0021] Figure 4 for Figure 2 A magnified structural diagram at point B.

[0022] Figure 5 This is a schematic diagram of the structure of a first-class sensor and safety controller for a safety protection device.

[0023] Figure 6 for Figure 1 Another structural diagram from another angle.

[0024] Figure 7 This is a schematic diagram of the closed structure of a safety protection device.

[0025] In the diagram: 1. Cabinet; 2. Mounting port; 3. Type I sensor; 301. Press plate; 302. Strike pin; 303. Telescopic rod; 304. Spring; 305. Rectangular opening; 306. Normally closed contact; 307. Limit switch; 4. Baffle; 401. Mounting slot; 5. Type II sensor; 501. Grating transmitter; 502. Window; 503. Grating receiver; 504. Strip groove; 6. Door panel; 7. Handle; 8. Safety controller. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0028] Reference Figures 1 to 7 This embodiment provides a safety protection device, including: Cabinet 1, which has an installation port 2. The inner walls on both sides of the installation port 2 are equipped with baffles 4 near the inner side of the cabinet 1. The inner walls of the installation port 2 are equipped with openable door panels 6 near the outer side of the cabinet 1. The first type of sensor 3 is disposed between the door panel 6 and the baffle 4, and is used to detect the opening and closing state of the door panel 6 and output a first state signal. The second type of sensor 5 is set at the mounting port 2 and is used to detect the intrusion status of the mounting port 2 area and output a second status signal. Safety controller 8 is installed on baffle 4 and is electrically connected to the first type of sensor 3, the second type of sensor 5 and the drive unit of the mechanical actuator in cabinet 1, respectively. When the safety controller 8 receives the first status signal or the second status signal, it immediately outputs an emergency stop command to the drive unit of the mechanical actuator inside the cabinet 1.

[0029] When the equipment is running normally, the door panel 6 is closed, and at the same time, no object enters the area of ​​the installation port 2. The safety controller 8 continuously receives and monitors the normal signals. When the operator opens the door panel 6, the contact point inside the first type of sensor 3 is disconnected due to the movement of the door panel, causing the first type of sensor 3 to emit a first state signal. The safety controller 8 immediately detects this signal change and applies the emergency brake. When a person's limb or object intrudes into the area of ​​the installation port 2, it will block the light curtain emitted by the second type of sensor 5, and then disconnect its safety output contact, causing the second type of sensor 5 to emit a second state signal. The safety controller 8 will detect this signal change again and apply emergency braking again to avoid the first failure to apply emergency braking, or to apply emergency braking directly without opening the door panel 6. When the safety controller 8 receives the first or second status signal, it considers the entire system to be in a dangerous state. The safety controller 8 then disconnects its safety output relay and outputs the highest priority emergency stop command to the drive unit of the mechanical actuator inside the cabinet 1, so that the equipment stops quickly.

[0030] Specifically, a mounting groove 401 is provided on the baffle 4 near the door panel 6 on the opening side. The first type of sensor 3 is installed inside the mounting groove 401, and the safety controller 8 is installed on the back of the door panel 6 near the mounting groove 401.

[0031] Furthermore, the first type of sensor 3 includes a limit switch 307 fixed on the inner wall of the bottom of the mounting groove 401. A telescopic rod 303 is fixed at the center of the surface of the limit switch 307. A spring 304 is wound around the outside of the telescopic rod 303. A pressing plate 301 is installed at the top of the telescopic rod 303. The pressing plate 301 is slidably disposed on the inner wall of the mounting groove 401. When the pressing plate 301 is not subjected to pressure from the door panel 6, the bottom end of the pressing plate 301 is attached to the port of the mounting groove 401.

[0032] The limit switch 307 has rectangular openings 305 on both sides of its surface. Normally closed contacts 306 are provided on the inner walls of the rectangular openings 305. The bottom outer walls of the pressing plate 301 are provided with striking pins 302 on both sides. The striking pins 302 are located directly above the normally closed contacts 306. When the pressing plate 301 is pressed by the door panel 6, the bottom end of the striking pin 302 is attached to the surface of the normally closed contacts 306.

[0033] When the door panel 6 is closed, the telescopic rod 303 is in a compressed state, and the striker 302 is connected to the normally closed contact 306. When the door panel 6 is opened, the pressing plate 301 moves outward, the telescopic rod 303 extends outward, and the striker 302 leaves the normally closed contact 306, thereby causing the limit switch 307 to send a first state signal to the safety controller 8.

[0034] It should be noted that the safety controller 8 is a safety relay, and the two terminals of the normally closed contact 306 are connected to the input monitoring terminal of the safety relay through wires.

[0035] When the door panel 6 is closed, the striker 302 keeps the normally closed contact 306 of the limit switch 307 physically closed, thereby forming a continuous current loop between the input monitoring terminals of the safety relay through the wire. At this time, the safety relay detects a continuous current signal and determines that the first state signal is safe. When the door panel 6 is opened, the striker 302 disengages from the normally closed contact 306, and the limit switch 307 immediately physically disconnects the normally closed contact 306. The current loop is forcibly cut off, and the input monitoring terminal of the safety relay instantly detects the disappearance of current. It then determines that the first state signal is dangerous and triggers its internal output relay to act, sending an emergency stop command to the equipment drive unit.

[0036] Specifically, the second type of sensor 5 includes a grating transmitter 501 and a grating receiver 503.

[0037] Furthermore, a slot is provided on the top inner wall of the mounting port 2, and the grating emitter 501 is fixed inside the slot.

[0038] The mounting port 2 has a strip groove 504 on its bottom inner wall. The grating receiver 503 is installed inside the strip groove 504. A baffle 502 is horizontally installed at the port of the strip groove 504.

[0039] The grating transmitter 501 continuously emits coded infrared beams towards the grating receiver 503 directly below, forming a vertical light curtain in the open area of ​​the mounting port 2. When the light curtain is not blocked, the grating receiver 503 can continuously receive complete light signals and keep its internal safety output circuit closed. At this time, the safety controller 8 determines that it is in a safe state. When a person's limb or object enters from the mounting port 2 and blocks any beam of light, the grating receiver 503 immediately detects the interruption of the light signal and then physically disconnects its internal safety output circuit. The circuit break signal is transmitted to the safety controller 8, which then determines that there is an intrusion hazard and triggers an emergency stop command.

[0040] It should be noted that a door handle 7 is installed on one end of the surface of the door panel 6.

[0041] Furthermore, both the first type of sensor 3 and the second type of sensor 5 are connected to the monitoring input terminal of the safety controller 8 through a normally closed safety circuit. The safety controller 8 determines whether the first state signal and the second state signal are issued by monitoring the current on / off state of the normally closed safety circuit in real time.

[0042] When in use, if the door 6 of the equipment cabinet 1 is closed and there are no intruders in the installation port 2 area, the normally closed contact 306 of the first type sensor 3 remains closed due to pressure, and the light curtain of the second type sensor 5 remains unobstructed. Both of them output a circuit conduction signal indicating safety to the safety relay. Once the door 6 is opened, the normally closed contact 306 of the first type sensor 3 will be physically disconnected, or the light curtain will be blocked by an intruder, causing the safety output circuit of the grating receiver 503 to be physically disconnected. In either case, the current of the corresponding monitoring circuit will be immediately cut off. The safety relay continuously monitors the current status of these two independent circuits. As soon as it detects that the current of either circuit is interrupted, it instantly determines that the system has entered a dangerous state and immediately drives its internal safety output relay to operate, cutting off the drive of the equipment.

[0043] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A safety protection device, characterized in that: include: The cabinet (1) has an installation port (2) on it. The inner walls on both sides of the installation port (2) are equipped with baffles (4) near the inner side of the cabinet (1). The inner walls of the installation port (2) are equipped with openable door panels (6) near the outer side of the cabinet (1). The first type of sensor (3) is disposed between the door panel (6) and the baffle (4) for detecting the opening and closing state of the door panel (6) and outputting a first state signal; The second type of sensor (5) is set at the mounting port (2) to detect the intrusion status of the mounting port (2) area and output a second status signal; The safety controller (8) is installed on the baffle (4) and is electrically connected to the drive unit of the first type of sensor (3), the second type of sensor (5) and the mechanical actuator in the cabinet (1), respectively. When the safety controller (8) receives the first status signal or the second status signal, it immediately outputs an emergency stop command to the drive unit of the mechanical actuator inside the cabinet (1).

2. The safety protection device as described in claim 1, characterized in that: The baffle (4) has an installation groove (401) on the door panel (6) near the door opening side. The first type of sensor (3) is installed inside the installation groove (401), and the safety controller (8) is installed on the back of the door panel (6) near the installation groove (401).

3. The safety protection device as described in claim 2, characterized in that: The first type of sensor (3) includes a limit switch (307) fixed on the inner wall of the bottom of the mounting groove (401). A telescopic rod (303) is fixed at the center of the surface of the limit switch (307). A spring (304) is wound around the outside of the telescopic rod (303). A pressing plate (301) is installed at the top of the telescopic rod (303). The pressing plate (301) is slidably disposed on the inner wall of the mounting groove (401). When the pressing plate (301) is not subjected to pressure from the door panel (6), the bottom end of the pressing plate (301) is attached to the port of the mounting groove (401).

4. The safety protection device as described in claim 3, characterized in that: The limit switch (307) has rectangular openings (305) on both sides of its surface. Normally closed contacts (306) are provided on the inner walls of the rectangular openings (305). The bottom outer walls of the pressing plate (301) are provided with strikers (302) on both sides. The strikers (302) are located directly above the normally closed contacts (306). When the pressing plate (301) is subjected to pressure from the door panel (6), the bottom end of the strikers (302) is attached to the surface of the normally closed contacts (306).

5. A safety protection device as described in claim 4, characterized in that: The safety controller (8) is a safety relay, and the two terminals of the normally closed contact (306) are connected to the input monitoring terminal of the safety relay through wires.

6. A safety protection device as described in claim 1, characterized in that: The second type of sensor (5) includes a grating transmitter (501) and a grating receiver (503).

7. A safety protection device as described in claim 6, characterized in that: A slot is provided on the top inner wall of the mounting port (2), and the grating emitter (501) is fixed inside the slot.

8. A safety protection device as described in claim 7, characterized in that: A strip groove (504) is opened on the bottom inner wall of the mounting port (2), the grating receiver (503) is installed inside the strip groove (504), and a baffle (502) is horizontally installed at the port of the strip groove (504).

9. A safety protection device as described in claim 1, characterized in that: A door handle (7) is installed at one end of the surface of the door panel (6).

10. A safety protection device as described in claim 1, characterized in that: Both the first type of sensor (3) and the second type of sensor (5) are connected to the monitoring input terminal of the safety controller (8) through a normally closed safety circuit. The safety controller (8) determines whether the first state signal and the second state signal are issued by monitoring the current on / off state of the normally closed safety circuit in real time.

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