Control system of isolation rail safety door interlocking switch based on PLC

Abstract

The utility model provides a PLC-based control system of an isolation rail safety door interlocking switch, and belongs to the technical field of workshop safety maintenance. The problem that the operation safety of maintainers in an isolation area is low is solved. According to the technical scheme, a door lock switch, an alarm and a lock are installed on a safety door, a door lock switch state signal is connected into a PLC control system to conduct real-time safety interlocking on equipment, a special key needs to be used for unlocking when the equipment enters an isolation area, a maintainer operates in the isolation area to open the safety door, and the corresponding equipment can be interlocked; an operator cannot start the equipment outside an isolation area, so that the interlocking equipment is opened by the safety door; and meanwhile, sound-light alarm is accompanied. The beneficial effects of the utility model are that the safety of maintainers during operation in an isolation area is guaranteed, thereby avoiding the occurrence of personal safety accidents.

Description

Technical Field

[0001] The utility model relates to the technical field of workshop safety maintenance, in particular to a control system of an isolation railing safety door interlock switch based on a PLC. Background Art

[0002] During production in the wide and thick plate workshop 2, in order to ensure production safety, isolation railings are installed around the entire equipment in the workshop to isolate personnel from harm caused by the running equipment. However, there will be certain safety hazards when entering and exiting the isolation area at will through the isolation railing safety door, or when performing maintenance work in the isolation area, which is not conducive to the safety of maintenance personnel. Therefore, it is necessary to improve the safety of the isolation railing safety door, and it is urgent to produce an interlock switch for the safety door switch. Utility Model Content

[0003] In order to improve the safety of the isolation railing safety door and ensure the safety of maintenance workers or staff, the utility model provides a control system of an isolation railing safety door interlock switch based on PLC, which can interlock the equipment in the isolation area when the safety door is open to reduce safety hazards.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is specifically as follows:

[0005] A control system for an isolation railing safety door interlock switch based on PLC, including an interlock switch, the interlock switch including an electromagnetic lock and a door bolt, the electromagnetic lock being a D4SL-N2NFG-D safety electromagnetic lock, the door bolt being inserted into the lock port of the electromagnetic lock, the door bolt and the electromagnetic lock being used to close the railing safety door, an opening and closing control device being provided on one side of the electromagnetic lock, the opening and closing control device being used to control the opening and closing of the electromagnetic lock; the opening state of the electromagnetic lock being used to control the closing of the equipment in the safety door of the railing. When maintenance personnel close the electromagnetic lock through the opening and closing control device and open the safety door to enter the isolation area for maintenance work, the equipment in the railing safety door is closed synchronously, thereby reducing the hidden dangers of maintenance personnel in the isolation area.

[0006] Furthermore, the opening and closing control device includes an emergency stop button and a key switch, both of which are used to control the opening of the electromagnetic lock. The electromagnetic lock can be opened by pressing the emergency stop button or inserting the key into the key switch and turning the key. The key switch can also be used to control the closing of the electromagnetic lock.

[0007] Furthermore, an alarm is provided on the safety door, and the emergency stop button and the key switch are used to control the activation of the alarm. After the safety door is opened, the alarm is activated synchronously to warn operators outside the isolation area to prevent the safety door from being accidentally closed by the operator.

[0008] Furthermore, the alarm is a JD-SGBJQ01 model dual-color sound and light alarm.

[0009] Furthermore, an operation box is provided on the safety door, and the operation box has a built-in power supply, and the power supply in the operation box is used to power the alarm and the electromagnetic lock. The workshop environment is complex, and it is not convenient to connect the power cords of the alarm and the electromagnetic lock over a long distance. The operation box can provide power nearby, which is convenient for the alarm and the electromagnetic lock to be quickly powered on.

[0010] In order to control the operation of the above-mentioned PLC-based isolation railing safety door interlock switch, the utility model provides a control system of the PLC-based isolation railing safety door interlock switch, and the control system also includes:

[0011] A PLC programmable logic controller is arranged between the electromagnetic lock and the railing safety door. The PLC programmable logic controller is a Siemens 400 series PLC. The auxiliary contacts are arranged in the electromagnetic lock. When the door bolt is inserted into the electromagnetic lock, the door bolt rests on the auxiliary contact position; the auxiliary contacts in the electromagnetic lock are connected to the input end of the PLC programmable logic controller, and the control end of the PLC programmable logic controller is connected to the switch electronic control drive end in the railing safety door; when the key is used to open the safety door or the alarm stop button is pressed, the safety door opens, the door bolt disengages from the auxiliary contact position, the auxiliary contact in the electromagnetic lock is triggered, and the door opening signal is input into the input end of the PLC programmable logic controller. The control end of the PLC programmable logic controller sends a signal to the equipment interlocking program through the switch electronic control drive end of the equipment in the safety door, so that the switch of the equipment in the railing safety door is closed, thereby interlocking the corresponding equipment.

[0012] Furthermore, the control end of the PLC programmable logic controller is connected to the switch electronic control drive end of the alarm, and the signal sent by the control end of the PLC programmable logic controller is simultaneously input into the switch electronic control drive end of the alarm, causing the alarm to start emitting light and making sound to alert operators outside the isolation area.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. By installing door lock switches, alarms and locks on the safety door, and then connecting the door lock switch status signal to the PLC control system, the equipment can be interlocked in real time. A special key is required to unlock the isolation area. When maintenance personnel open the safety door in the isolation area, the corresponding equipment can be interlocked, so that the operator cannot start the equipment outside the isolation area, thus realizing the safety door opening interlocking device; the safety of maintenance personnel working in the isolation area is guaranteed, thereby avoiding the occurrence of personal safety accidents.

[0015] 2. Through the synchronous activation of the alarm, the alarm lights up and sounds, which can remind the operators outside the isolation area that the safety door has been opened and there are maintenance personnel in the isolation area.

[0016] 3. The operation box can provide power nearby, which is convenient for the quick power-on of the alarm and electromagnetic lock, avoiding long-distance connection of the power cords of the alarm and electromagnetic lock in a workshop with a complex environment, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.

[0019] Figure 2 This is a data transmission flow chart of the control program of an embodiment of the utility model.

[0020] Among them, the figure markings are: 1, electromagnetic lock; 2, door bolt; 3, opening and closing control device; 31, emergency stop button; 32, key switch; 4, alarm; 5, electronic screen; 6, operation box; 7, railing; 71, safety door. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Example

[0022] See also Figure 1 The utility model provides a technical solution in which an isolation railing safety door interlock switch includes an electromagnetic lock 1 and a bolt 2, which are respectively installed on the railing 7 and the safety door 71, and the electromagnetic lock 1 is a D4SL-N2NFG-D type safety electromagnetic lock. The bolt 2 is inserted into the lock mouth of the electromagnetic lock 1, and an opening and closing control device 3 is arranged on one side of the electromagnetic lock 1. The opening and closing control device 3 includes an emergency stop button 31 and a key switch 32, and the key switch 32 is used for inserting the key of the safety door 71. An alarm 4 is arranged on the top of the safety door 71, and the alarm 4 is a two-color sound and light alarm; an operation box 6 is installed on one side of the safety door 71, and the operation box 6 has a built-in power supply. The power lines of the electromagnetic lock 1 and the alarm are connected to the power supply in the operation box 6 to realize power supply.

[0023] In order to control the operation of the PLC-based isolation railing safety door interlock switch, the embodiment of the utility model also provides a control system for the PLC-based isolation railing 7 safety door 71 interlock switch, the control system includes:

[0024] A PLC programmable logic controller is arranged between the electromagnetic lock 1 and the equipment in the railing 7 safety door 71. The PLC programmable logic controller is a Siemens 400 series PLC. Auxiliary contacts are arranged in the electromagnetic lock 1. When the bolt 2 is inserted into the electromagnetic lock 1, the bolt 2 is against the auxiliary contact position. The auxiliary contacts in the electromagnetic lock 1 are connected to the input end of the PLC programmable logic controller, and the control end of the PLC programmable logic controller is connected to the switch electronic control drive end of the equipment in the railing 7 safety door 71. The control end of the PLC programmable logic controller is connected to the switch electronic control drive end of the alarm 4.

[0025] When it is necessary to enter the isolation area for equipment maintenance, the maintenance personnel use the key to insert the key switch 32 to open the safety door 71 or press the alarm stop button to open the safety door 71, the bolt 2 disengages from the auxiliary contact position, and the auxiliary contact in the electromagnetic lock 1 is triggered, and the door opening signal is input into the input end of the PLC programmable logic controller. The control end of the PLC programmable logic controller sends the signal to the equipment interlocking program through the switch of the equipment in the safety door 71, so that the switch of the equipment in the railing 7 safety door 71 is closed, thereby interlocking the corresponding equipment.

[0026] At the same time, the signal sent by the control end of the PLC programmable logic controller is simultaneously input into the switch electronic control drive end of the alarm 4, causing the alarm 4 to start emitting light and sounding to remind operators outside the isolation area that there are maintenance personnel in the isolation area and not to close the safety door 71.

[0027] In this embodiment, the interlocking program for controlling the interlocking shutdown of the equipment is a Siemens step 7 automatic control program. Example

[0028] Reference Figure 1 , based on Example 1, the difference from Example 1 is that:

[0029] An electronic screen 5 is installed on the outside of the safety door 71. The electronic screen 5 has a warning slogan pre-input to remind that there are people in the isolation area. The control end of the PLC programmable logic controller is connected to the switch electronic control drive end of the electronic screen 5, and the power cord of the electronic screen 5 is connected to the power terminal in the operation box 6.

[0030] After the PLC programmable logic controller receives the signal that the safety door 71 is open, the signal sent by the control end is transmitted to the switch electronic control drive end of the electronic screen 5, causing the warning sign on the electronic screen 5 to start lighting up, thereby alerting the operator outside the isolation area from the perspective of text reminder.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PLC-based control system for an isolation railing safety door interlock switch, characterized in that: The interlock switch comprises an electromagnetic lock (1) and a door latch (2); the door latch (2) cooperates with the electromagnetic lock (1) to close a safety door (71) on a railing (7); a start-and-stop control device (3) is provided on one side of the electromagnetic lock (1); the start-and-stop control device (3) is used to control the opening and closing of the electromagnetic lock (1); the open state of the electromagnetic lock (1) is used to control the closing of equipment in the safety door (71) on the railing (7); A control system for an isolation railing safety door interlock switch based on PLC, the control system also includes: A PLC programmable logic controller is arranged between the electromagnetic lock (1) and the equipment in the safety door (71), and an auxiliary contact is arranged in the electromagnetic lock (1). The auxiliary contact in the electromagnetic lock (1) is connected to the input end of the PLC programmable logic controller, and the control end of the PLC programmable logic controller is connected to the switch electric control drive end of the equipment in the safety door (71) on the railing (7).

2. The control system of the isolation railing safety door interlock switch based on PLC according to claim 1 is characterized in that: The opening and closing control device (3) comprises an emergency stop button (31) and a key switch (32); both the emergency stop button (31) and the key switch (32) can be used to control the opening of the electromagnetic lock (1); and the key switch (32) can also be used to control the closing of the electromagnetic lock (1).

3. The control system of the PLC-based isolation railing safety door interlock switch according to claim 2 is characterized in that: The safety door (71) is provided with an alarm (4), and the emergency stop button (31) and the key switch (32) are both used to control the activation of the alarm (4).

4. The control system of the PLC-based isolation railing safety door interlock switch according to claim 3 is characterized in that: The alarm (4) is a two-color sound and light alarm.

5. The control system of the PLC-based isolation railing safety door interlock switch according to claim 4 is characterized in that: An operating box (6) is provided on the safety door (71), and the operating box (6) has a built-in power supply. The power supply in the operating box (6) is used to supply power to the alarm (4) and the electromagnetic lock (1).

6. The control system of the PLC-based isolation railing safety door interlock switch according to claim 5 is characterized in that: The control end of the PLC programmable logic controller is connected to the switch electric control drive end of the alarm (4).

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