Safety production protection system

Abstract

The invention provides a safety production protection system which comprises a first detection device and a second detection device which are arranged on a production line in a spaced mode, and the second detection device is located on the downstream of the first detection device. The conveying assembly is used for conveying materials; and the controller is used for receiving a first detection signal sent by the first detection device and a second detection signal sent by the second detection device, and controlling the operation of the production line according to the first detection signal and / or the second detection signal. The first detection device and the second detection device which are arranged on the production line in a spaced mode are matched with the controller to guarantee safe operation of the production line, and the controller can detect normal material conveying according to the first detection signal and / or the second detection signal. And meanwhile, people can be detected to intrude into the production line, so that safety accidents caused by the fact that people intrude into the production line can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of safety protection in production workshops, and particularly to a safety production protection system. Background Art

[0002] At present, a protective net is used for protection at the lower belt of the sheet metal production line, and a discharge port is reserved at the protective net to output the housing. If an employee enters the working area from the discharge port during the operation of production equipment (such as a manipulator), it will cause the manipulator to injure people. There are serious potential safety hazards of mechanical injury on site, which does not meet the requirements of intrinsic safety, and there are loopholes in safety management.

[0003] In view of this, it is necessary to provide a safety production protection system to solve the above technical problems. Summary of the Invention

[0004] To achieve the above object, the present invention provides a safety production protection system, which includes a first detection device and a second detection device that are spaced apart on a production line, and the second detection device is located downstream of the first detection device; a transmission component for transmitting materials; a controller for receiving a first detection signal sent by the first detection device and a second detection signal sent by the second detection device, and controlling the operation of the production line according to the first detection signal and / or the second detection signal.

[0005] As a further improvement of the present invention, when the controller receives the second detection signal, it determines whether the first detection signal has been received before a first preset time T1. If so, the controller controls the production line to continue running; if not, the controller controls the production line to stop running.

[0006] As a further improvement of the present invention, the first preset time T1 = L1 / V;

[0007] wherein, V is the transmission speed of the transmission component, and L1 is the distance between the first detection device and the second detection device.

[0008] As a further improvement of the present invention, within one production cycle, when the controller receives the first detection signal, it determines whether the second detection signal has been received by the controller before that. If so, the controller controls the production line to stop running; if not, the controller controls the production line to continue running.

[0009] As a further improvement of the present invention, the controller also controls the operation of the second detection device;

[0010] If the controller receives the first detection signal, the controller controls the second detection device to stop operating and restarts the second detection device after a second preset time T2; if the controller receives the second detection signal, the controller controls the production line to stop operating.

[0011] As a further improvement of the present invention, the controller immediately controls the second detection device to stop operating, and the second preset time T2 = (L1 + L2) / V;

[0012] wherein, V is the transmission speed of the transmission component, L1 is the distance between the first detection device and the second detection device, L2 is the size of the material along the transmission direction, and L1 is less than or equal to the first preset distance.

[0013] As a further improvement of the present invention, the controller controls the second detection device to stop operating after a third preset time T3;

[0014] The second preset time T2 = L2 / V; the third preset time T3 = L1 / V;

[0015] wherein, V is the transmission speed of the transmission component, L1 is the distance between the first detection device and the second detection device, and L2 is the size of the material along the transmission direction.

[0016] As a further improvement of the present invention, within one production cycle, when the controller receives the detection signal for the first time, it determines whether the detection signal is the first detection signal. If so, the controller controls the production line to continue operating; if not, the controller controls the production line to stop operating.

[0017] As a further improvement of the present invention, the first detection device is a photoelectric sensor; the second detection device is a grating.

[0018] As a further improvement of the present invention, an alarm device and a reset device are further included. The alarm device is used to issue an alarm when the production line stops operating, and the reset device is used to restart the production line.

[0019] As a further improvement of the present invention, the production line includes production equipment and a discharge port located downstream of the production equipment, and the transmission component transports materials from the production equipment to the discharge port;

[0020] The second detection device is arranged at the position of the discharge port, and the distances between the sensing area of the second detection device and the top and bottom of the discharge port are less than or equal to the second preset distance.

[0021] As a further improvement of the present invention, the production line further includes a protection component. The protection component and the transmission component enclose to form the discharge port, and the second detection device is fixed on the protection component; the second detection device is located on the side of the protection component facing the production equipment.

[0022] As a further improvement of the present invention, the production line is a sheet metal processing line; the material is a sheet metal shell of a refrigeration equipment.

[0023] Beneficial effects of the present invention: The present invention ensures the safe operation of the production line by the first detection device and the second detection device arranged at intervals on the production line in cooperation with the controller. The controller can detect normal material transmission according to the first detection signal and / or the second detection signal, and can also detect when a person breaks into the interior of the production line, and controls the operation of the production line accordingly, so as to prevent a safety accident caused by a person breaking into the interior of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 is a schematic diagram of the overall structure of the safety production protection system of the present invention;

[0026] Figure 2 is a partial schematic diagram of the safety production protection system of the present invention;

[0027] Figure 3 is Figure 2 a rear view of the safety production protection system shown;

[0028] Figure 4 is Figure 2 a top view of the safety production protection system shown;

[0029] Figure 5 is a schematic diagram of the material being transported to the position where the second detection device is located;

[0030] Figure 6 is a schematic diagram of the material being transported to the position where the first detection device is located;

[0031] Figure 7 is a schematic diagram of the material being transported from the first detection device and completely passing through the second detection device;

[0032] In the figure:

[0033] 100. First detection device; 200. Second detection device; 201. Transmitting part; 202. Receiving part; 300. Discharge port; 400. Transmission assembly; 500. Protection assembly; 501. Protection frame; 502. Protection net; M. Material. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0035] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, they can be mechanically connected or electrically connected, or the internal communication of two elements can be realized. They can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] As Figures 1 to 7 shown, the present invention provides a safety production protection system, which includes a first detection device 100 and a second detection device 200 arranged at intervals on a production line, a transmission assembly 400 for transmitting a material M, and a controller.

[0039] Among them, the second detection device 200 is located downstream of the first detection device 100, and the distance between the first detection device 100 and the second detection device 200 can be adjusted adaptively according to needs.

[0040] When the material M or other object reaches the position where the first detection device 100 is located, the first detection device 100 will be triggered, and at the same time, the first detection device 100 sends a first detection signal to the controller. When the material M or other object reaches the position where the second detection device 200 is located, the second detection device 200 will be triggered, and at the same time, the second detection device 200 sends a second detection signal to the controller.

[0041] It can be understood that when the material M is normally transported through the transport component 400, the material M first reaches the position where the first detection device 100 is located, and then reaches the position where the second detection device 200 is located, that is, the first detection device 100 will be triggered first. If there are other objects (such as on-site staff) entering the interior of the production line, they will first reach the position where the second detection device 200 is located, that is, the second detection device 200 will be triggered first.

[0042] In this embodiment, the first detection device 100 adopts a photoelectric sensor. When the material M is transported to the position where the photoelectric sensor is located, the photoelectric sensor detects the material M and sends a first detection signal to the controller. Of course, in other embodiments, the first detection device 100 can also adopt an infrared sensor or the like.

[0043] The second detection device 200 adopts a grating. The grating includes a transmitting part 201 and a receiving part 202 arranged at intervals. The arrangement direction of the transmitting part 201 and the receiving part 202 is perpendicular to the transmission direction of the transport component 400, and the transport component 400 is located between the transmitting part 201 and the receiving part 202. When the material M is transported through the transport component 400 to between the transmitting part 201 and the receiving part 202 or when other objects enter from the outside and move to between the transmitting part 201 and the receiving part 202, the grating is triggered and sends a second detection signal to the controller.

[0044] The controller is used to receive the first detection signal sent by the first detection device 100 and the second detection signal sent by the second detection device 200, and control the operation of the production line according to the first detection signal and / or the second detection signal.

[0045] When the controller determines that the material M normally exits the production line according to the first detection signal and / or the second detection signal, the controller controls the production line to continue running. When the controller determines that there are other objects entering the interior of the production line from the outside according to the first detection signal and / or the second detection signal, the controller controls the production line to stop running, thereby preventing safety accidents.

[0046] The production line includes production equipment (not shown in the figure), a discharge port 300 located downstream of the production equipment, and the transmission assembly 400.

[0047] The location where the production equipment is located is the working area, which is used for processing and producing the material M. The transmission assembly 400 is used to transmit the material M from the working area to the discharge port 300, so as to output the processed material M from the working area. The transmission assembly 400 uses belt transmission.

[0048] The second detection device 200 is arranged at the location of the discharge port 300. Through the second detection device 200, the material M normally output from the discharge port 300 can be detected, and at the same time, other objects breaking into the working area from the discharge port 300 can also be detected. The transmitting part 201 and the receiving part 202 are arranged on both sides of the discharge port 300, so as not to affect the normal output of the material M. The second detection device 200 is located downstream of the first detection device 100, that is, the discharge port 300 is located downstream of the first detection device 100.

[0049] It should be specially noted that the distance between the induction area of the second detection device 200 and the top and bottom of the discharge port 300 is less than or equal to a second preset distance. The induction area of the second detection device 200 is the area between the transmitting part 201 and the receiving part 202, and the second preset distance can be set to 5 - 10 cm. In this way, as long as a person breaks into the working area from the discharge port 300, the second detection device 200 can be triggered, thus completely eliminating the hidden danger of safety accidents caused by on-site workers privately entering the working area.

[0050] In a specific embodiment, the height H of the induction area of the second detection device 200 is the same as the height of the discharge port 300. That is, the bottoms of the transmitting part 201 and the receiving part 202 are flush with the bottom of the discharge port 300, and the tops of the transmitting part 201 and the receiving part 202 are flush with the top of the discharge port 300, so as to achieve complete protection of the discharge port 300.

[0051] The production line further includes a protection assembly 500, and the protection assembly 500 is used to prevent personnel from entering the working area from other positions except the discharge port 300. The protection assembly 500 includes a protection frame 501 and a protection net 502 located inside the protection frame 501, and the protection frame 501 is formed by connecting a plurality of columns and a plurality of crossbars.

[0052] The protection component 500 and the transmission component 400 enclose to form the discharge port 300. The protection component 500 is provided on both sides of the discharge port 300, and the position corresponding to the protection component 500 above the transmission component 400 is the discharge port 300.

[0053] It should be noted that, since the width of the discharge port 300 is greater than the width of the transmission component 400, the protection component 500 is also provided below the discharge port 300, and the height of this protection component 500 is the same as the height of the transmission component 400.

[0054] The second detection device 200 is fixed on the protection component 500. It can be understood that the transmitting part 201 and the receiving part 202 are respectively fixed on the protection frame 501 of the protection component 500 located on both sides of the discharge port 300.

[0055] Preferably, the second detection device 200 is located on the side of the protection component 500 facing the production equipment, that is, the second detection device 200 is fixed inside the discharge port 300, so as to prevent the second detection device 200 from being accidentally triggered.

[0056] This safety production protection system further includes an alarm device and a reset device. The alarm device is used to give an alarm when the production line stops running, so as to remind the on-site person in charge. The alarm device can adopt ways such as sound and light. The reset device is used to restart the production line. When the production line stops running due to detecting an external intrusion of a person, after the on-site person in charge eliminates the safety hazard, the production line can be restarted through the reset device.

[0057] In this article, the production line is a sheet metal processing line; the material is a sheet metal shell of a refrigeration device, and the refrigeration device includes but is not limited to refrigerators, freezers, etc. Of course, this safety production protection system can also be applied to other production lines that need to prevent personnel from entering the work area.

[0058] The following specifically describes the protection logic of this safety production protection system:

[0059] Embodiment 1:

[0060] When the controller receives the second detection signal, it judges whether the first detection signal is received before the first preset time T1. If so, the controller controls the production line to continue running; if not, the controller controls the production line to stop running.

[0061] The first preset time T1 = L1 / V, where V is the transmission speed of the transmission component 400 and L1 is the distance between the first detection device 100 and the second detection device 200.

[0062] When the material M is output from the working area to the discharge port 300 via the transmission component 400, the material M will first reach the position where the first detection device 100 is located and trigger the first detection device 100. The first detection device 100 sends the first detection signal to the controller. The material M continues to be transmitted and then reaches the position where the second detection device 200 is located and triggers the second detection device 200. The second detection device 200 sends the second detection signal to the controller.

[0063] The transmission distance of the material M from the position where the first detection device 100 is located to the position where the second detection device 200 is located is L1, and L1 is the distance between the first detection device 100 and the second detection device 200; the transmission speed of the transmission component 400 is V. It can be seen that the time T1 for the material M to be transmitted from the position where the first detection device 100 is located to the position where the second detection device 200 is located is T1 = L1 / V.

[0064] If a person enters the working area from the discharge port 300, the second detection device 200 will be triggered immediately. The second detection device 200 sends the second detection signal to the controller. At the same time, the first detection device 100 is not triggered, and the controller does not receive the first detection signal sent by the first detection device 100.

[0065] In this way, when the controller receives the second detection signal, it only needs to confirm whether it has received the first detection signal before the first preset time T1. If so, it means that the material M is transmitted to the position where the second detection device 200 is located and triggers the second detection device 200. At this time, the controller controls the production line to continue running, and the material M is normally output from the discharge port 300 via the transmission component 400; if not, it means that a person enters the working area from the feed port 300 and triggers the second detection device 200. At this time, the controller controls the production line to stop running, and the alarm device emits an alarm at the same time to remind the on-site person in charge, so as to effectively prevent people from entering the working area privately and causing safety accidents.

[0066] Embodiment 2:

[0067] During a production cycle, when the controller receives the first detection signal, it judges whether the controller has received the second detection signal before that. If so, the controller controls the production line to stop running; if not, the controller controls the production line to continue running.

[0068] The production cycle is the time required for the production equipment to process and produce one material M, and at the same time is the time interval for the material M to be output from the discharge port 300.

[0069] When the material M is output from the working area to the discharge port 300 via the transmission component 400, the material M will first reach the position where the first detection device 100 is located and trigger the first detection device. The first detection device 100 sends the first detection signal to the controller. However, at this time, the material M has not been transmitted to the position where the second detection device 200 is located, that is, the second detection device 200 does not send the second detection signal to the controller.

[0070] If a person enters the working area from the discharge port 300, the second detection device 200 will be triggered immediately. The second detection device 200 sends the second detection signal to the controller; then the first detection device 100 will be triggered, and the first detection device 100 sends the first detection signal to the controller. That is, the controller will receive the second detection signal before receiving the first detection signal.

[0071] In this way, within one production cycle, when the controller receives the first detection signal, it only needs to confirm whether the second detection signal has been received before this production cycle. If so, it means that a person has entered the working area from the feed port 300 and triggered the first detection device 100. At this time, the controller controls the production line to stop running, and the alarm device sounds an alarm at the same time to remind the on-site person in charge, so as to effectively prevent personnel from entering the working area privately and causing safety accidents; if not, it means that the material M is transmitted to the position where the first detection device 100 is located and triggers the first detection device 100. At this time, the controller controls the production line to continue running, and the material M is normally output from the discharge port 300 via the transmission component 400.

[0072] It should be specifically noted that in this embodiment, the first detection device 100 is arranged close to the discharge port 300, so that when a person enters the working area from the feed port 300, the first detection device 100 can be triggered as early as possible.

[0073] Embodiment 3:

[0074] The controller can also control the operation of the second detection device 200 at the same time. If the controller receives the first detection signal, the controller controls the second detection device 200 to stop operating, and restarts the second detection device 200 after a second preset time T2; if the controller receives the second detection signal, the controller controls the production line to stop operating.

[0075] When the material M is output from the working area to the discharge port 300 via the transmission component 400, the material M will first reach the position where the first detection device 100 is located and trigger the first detection device 100, and the first detection device 100 sends the first detection signal to the controller. After receiving the first detection signal, the controller controls the second detection device 200 to stop operating, and the material M continues to be transmitted to the position where the second detection device 200 is located. Since the second detection device 200 stops operating, the material M does not trigger the second detection device 200, that is, the second detection device 200 does not send the second detection signal. When the material M completely passes through the second detection device 200, the controller restarts the second detection device 200.

[0076] If the controller receives the second detection signal, the controller controls the production line to stop operating. Since the material M will trigger the first detection device 100 first during the normal transmission process and cause the controller to control the second detection device 200 to stop operating, in this way, the material M will not trigger the second detection device 200. On this basis, if the controller receives the second detection signal, it indicates that someone enters the working area from the feed port 300 and triggers the second detection device 200. At this time, the controller controls the production line to stop operating, and the alarm device sounds an alarm at the same time to remind the on-site person in charge, so as to effectively prevent people from entering the working area privately and causing safety accidents.

[0077] In an implementation manner, after the controller receives the first detection signal, the controller immediately controls the second detection device 200 to stop operating, and the second preset time T2 = (L1 + L2) / V.

[0078] Wherein, V is the transmission speed of the transmission component 400, L1 is the distance between the first detection device 100 and the second detection device 200, and L2 is the dimension of the material M in the transmission direction.

[0079] The transmission distance of the material M from the position where the first detection device 100 is located to the position where the second detection device 200 is located is L1, and L1 is the distance between the first detection device 100 and the second detection device 200. The transmission distance for the material M to completely pass through the second detection device 200 is L2, and L2 is the dimension of the material M in the transmission direction. It can be seen that after the controller receives the first detection signal, the material M needs to continue to be transmitted for L1 + L2 before it can completely pass through the second detection device 200. Therefore, the duration for which the second detection device 200 stops operating, that is, the second preset time T2, is (L1 + L2) / V.

[0080] It should be specifically noted that in this embodiment, L1 is less than or equal to the first preset distance. If L1 is too large, it will cause the time required for the material M to be transmitted from the position where the first detection device 100 is located to the position where the second detection device 200 is located to be too long. If a person enters the working area from the discharge port 300 during this period, since the second detection device 200 is in a stopped operating state at this time, the second detection device 200 will not be triggered. The first preset distance is 1 cm to 2 cm.

[0081] In another embodiment, after the controller receives the first detection signal, the controller controls the second detection device 200 to stop operating after a third preset time T3, and restarts the second detection device 200 after a second preset time T2. The second preset time T2 = L2 / V; the third preset time T3 = L1 / V.

[0082] The transmission distance of the material M from the position where the first detection device 100 is located to the position where the second detection device 200 is located is L1, and L1 is the distance between the first detection device 100 and the second detection device 200. The transmission distance for the material M to completely pass through the second detection device 200 is L2, and L2 is the dimension of the material M in the transmission direction.

[0083] It can be seen that after the controller receives the first detection signal, the material M needs to continue to be transmitted for L1 before it can reach the position where the second detection device 200 is located. The transmission time required for the material M, that is, the third preset time T3 = L1 / V. The material M needs to continue for L2 before it can completely pass through the second detection device 200. Therefore, the duration for which the second detection device 200 stops operating, that is, the second preset time T2, is L2 / V.

[0084] Example 4:

[0085] During a production cycle, when the controller first receives a detection signal, it determines whether the detection signal is the first detection signal. If so, the controller controls the production line to continue running; if not, the controller controls the production line to stop running.

[0086] When the material M is output from the working area to the discharge port 300 via the transmission component 400, the material M will first reach the position where the first detection device 100 is located and trigger the first detection device 100. The first detection device 100 sends the first detection signal to the controller. Thus, during a production cycle, if the detection signal first received by the controller is the first detection signal, it indicates that the material M is transmitted to the position where the first detection device 100 is located and triggers the first detection device 100. At this time, the controller controls the production line to continue running, and the material M is normally output from the discharge port 300 via the transmission component 400.

[0087] If a person enters the working area from the discharge port 300, the second detection device 200 will be triggered first. The second detection device 200 sends the second detection signal to the controller. Thus, during a production cycle, if the detection signal first received by the controller is the second detection signal, it indicates that a person enters the working area from the feed port 300 and triggers the second detection device 200. At this time, the controller controls the production line to stop running, and the alarm device simultaneously issues an alarm to remind the on-site person in charge, thereby effectively preventing a safety accident caused by unauthorized entry of personnel into the working area.

[0088] In summary, the present invention ensures the safe operation of the production line by the first detection device 100 and the second detection device 200 arranged at intervals on the production line in cooperation with the controller. The controller can detect normal material transmission according to the first detection signal and / or the second detection signal, and can also detect when a person breaks into the production line. Based on this, the controller controls the operation of the production line, thereby preventing a safety accident caused by a person breaking into the production line.

[0089] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0090] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included within the protection scope of the present invention.

Claims

1. A safety production protection system, characterized in that, Including: A first detection device (100) and a second detection device (200) that are spaced apart on a production line, and the second detection device (200) is located downstream of the first detection device (100); A transmission assembly (400) for transporting materials; A controller for receiving a first detection signal sent by the first detection device (100) and a second detection signal sent by the second detection device (200), and controlling the operation of the production line according to the first detection signal and / or the second detection signal.

2. The safety production protection system according to claim 1, wherein: When the controller receives the second detection signal, it determines whether the first detection signal was received before a first preset time T1. If so, the controller controls the production line to continue running; if not, the controller controls the production line to stop running.

3. The safety production protection system according to claim 2, wherein: The first preset time T1 = L1 / V; Wherein, V is the transmission speed of the transmission assembly (400), and L1 is the distance between the first detection device (100) and the second detection device (200).

4. The safety production protection system according to claim 2, wherein: Within one production cycle, when the controller receives the first detection signal, it determines whether the controller received the second detection signal before that. If so, the controller controls the production line to stop running; if not, the controller controls the production line to continue running.

5. The safety production protection system according to claim 1, wherein: The controller also controls the operation of the second detection device (200); If the controller receives the first detection signal, the controller controls the second detection device (200) to stop running and restarts the second detection device (200) after a second preset time T2; If the controller receives the second detection signal, the controller controls the production line to stop running.

6. The safety production protection system according to claim 5, wherein: The controller immediately controls the second detection device (200) to stop running, and the second preset time T2 = (L1 + L2) / V; Wherein, V is the transmission speed of the transmission assembly (400), L1 is the distance between the first detection device (100) and the second detection device (200), L2 is the dimension of the material along the transmission direction, and L1 is less than or equal to a first preset distance.

7. The safety production protection system according to claim 5, characterized in that: The controller controls the second detection device (200) to stop running after a third preset time T3; The second preset time T2 = L2 / V; the third preset time T3 = L1 / V; Wherein, V is the transmission speed of the transmission assembly (400), L1 is the distance between the first detection device (100) and the second detection device (200), and L2 is the dimension of the material along the transmission direction.

8. The safety production protection system according to claim 1, wherein: Within one production cycle, when the controller receives a detection signal for the first time, it determines whether the detection signal is the first detection signal. If so, the controller controls the production line to continue running; if not, the controller controls the production line to stop running.

9. The safety production protection system according to any one of claims 1 to 8, characterized in that: The first detection device (100) is a photoelectric sensor; the second detection device (200) is a grating.

10. The safety production protection system according to any one of claims 1 to 8, characterized in that: It further includes an alarm device and a reset device. The alarm device is used to emit an alarm when the production line stops running, and the reset device is used to restart the production line.

11. The safety production protection system according to any one of claims 1 to 8, characterized in that: The production line includes production equipment and a discharge port (300) located downstream of the production equipment, and the transmission assembly (400) transports materials from the production equipment to the discharge port (300). The second detection device (200) is arranged at the position where the discharge port (300) is located, and the distances between the sensing area of the second detection device (200) and the top and bottom of the discharge port (300) are less than or equal to a second preset distance.

12. The safety production protection system according to claim 11, wherein: The production line further includes a protection assembly (500). The protection assembly (500) and the transmission assembly (400) enclose to form the discharge port (300), and the second detection device (200) is fixed on the protection assembly (500); the second detection device (200) is located on the side of the protection assembly (500) facing the production equipment.

13. The safety production protection system according to any one of claims 1 to 8, characterized in that: The production line is a sheet metal processing line; the material is a sheet metal housing of a refrigeration device.

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