Safety interlocking control device of packaging machine
By setting up indicator lights and a human-machine interface on the packaging machine, fault points of safety interlock switches can be quickly identified, solving the problem of long equipment maintenance time and improving production efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING CHINA TOBACCO IND CO LTD
- Filing Date
- 2025-04-08
- Publication Date
- 2026-04-17
AI Technical Summary
Existing packaging machines cannot accurately locate the fault point when the protective cover alarms, resulting in high maintenance time and costs and affecting production efficiency.
By setting a working indicator light on each safety interlock switch and using a PLC controller to control the lighting mode and the status display on the human-machine interface, fault points can be quickly identified, and the indicator light will flash to remind the user to turn off the safety interlock switch after shutdown, ensuring a safe state before restarting.
This significantly reduced equipment maintenance time and costs, improved unit production efficiency, and ensured a safe operating condition before startup.
Smart Images
Figure CN224131506U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of safety control technology for packaging machines, and more specifically, to a safety interlock control device for packaging machines. Background Technology
[0002] During roll packaging operations, GD packaging equipment is equipped with a movable safety interlock protective cover, which is used to protect the personal safety of operators when the machine is running. When the protective cover is opened or not fully closed, it will trigger a change in the status of the interlock switch, and the machine will stop immediately.
[0003] However, in equipment operation and maintenance, since all interlocking circuits are connected in series, when the protective cover alarm occurs, the specific fault point cannot be fed back. It is necessary to check them one by one, which results in high equipment maintenance time and cost and seriously affects the unit's production efficiency. Utility Model Content
[0004] This application provides a safety interlock control device for a packaging machine. The device determines whether a safety interlock switch is faulty by observing the illumination pattern of the indicator lights on each safety interlock switch, which greatly reduces the time and cost of equipment maintenance and improves the production efficiency of the unit. Furthermore, the PLC controller will use flashing indicator lights to remind the user to turn off all open safety interlock switches before restarting after a shutdown, ensuring that the user is in a safe state before restarting.
[0005] This application provides a safety interlock control device for a packaging machine, including a PLC controller, start / stop buttons, and working indicator lights on each safety interlock switch;
[0006] The normally closed contact on each safety interlock switch is connected to one of the first input terminals of the PLC controller;
[0007] The start / stop button is connected to the second input terminal of the PLC controller;
[0008] The PLC controller is connected to the working indicator light signal. The PLC controller controls the lighting mode of the working indicator light according to the status of the packaging machine and the normally closed contact signal of the safety interlock switch.
[0009] Preferably, the safety interlock control device of the packaging machine further includes a human-machine interface, which is connected to the normally closed contact on each safety interlock switch;
[0010] The human-machine interface is connected to the PLC controller. The PLC controller controls the status display mode of the corresponding safety interlock switch on the human-machine interface based on the status of the packaging machine and the normally closed contact signal of the safety interlock switch.
[0011] Preferably, the safety interlock control device of the packaging machine also includes an alarm, which is connected to the PLC controller via signal.
[0012] Preferably, the safety interlock switch includes a limit switch and an electromagnetic coil for controlling the movement of the limit switch, and the electromagnetic coil is connected to the PLC controller for signal transmission.
[0013] Preferably, the alarm includes at least one of a sound alarm and a light alarm.
[0014] Preferably, the alarm is fixed on the top surface of the human-machine interface.
[0015] Preferably, the PLC controller is fixed in the electrical control box, which also contains a switching power supply. The switching power supply is connected to both the PLC controller and the human-machine interface.
[0016] Preferably, the electrical control box is also equipped with an air switch, which is connected to a switching power supply and connected to an external power supply through a terminal block.
[0017] Preferably, the electrical control box is equipped with a fan.
[0018] Preferably, the PLC controller is connected to the human-machine interface signal via a switch.
[0019] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description
[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.
[0021] Figure 1 Structural diagram of the safety interlock control device for the packaging machine provided in this application;
[0022] Figure 2 This is a structural schematic diagram of the electrical control box provided in this application;
[0023] Figure 3 A schematic diagram of the human-computer interface provided in this application. Detailed Implementation
[0024] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.
[0026] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.
[0027] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0028] This application provides a safety interlock control device for a packaging machine. The device determines whether a safety interlock switch is faulty by observing the illumination pattern of its indicator lights. This significantly reduces equipment maintenance time and costs while ensuring personal safety and improving unit production efficiency. Furthermore, the PLC controller uses flashing indicator lights after a shutdown and before restarting to remind the user to close all open safety interlock switches, ensuring the user is in a safe state before restarting. Based on the above, the status of all safety interlock switches is displayed through a human-machine interface, helping the user intuitively determine the number and location of fault points.
[0029] It should be noted that the protective cover on the packaging machine is equipped with multiple safety interlock switches. Only when all safety interlock switches are in the closed state when the machine is on can the personal safety of the user be guaranteed.
[0030] like Figure 1 As shown, the safety interlock control device for the packaging machine provided in this application includes a PLC controller 10, a start / stop button 40, and a working indicator light 23 on each safety interlock switch 20.
[0031] The normally closed contact 22 on each safety interlock switch 20 is connected to one of the first input terminals of the PLC controller 10. During the process of a safety interlock switch 20 changing from closed to open, the voltage output from the normally closed contact 22 decreases. When the voltage drops below a threshold, the PLC controller determines that the safety interlock switch 20 is open. Thus, the PLC controller determines the state change of each safety interlock switch 20 based on the voltage change.
[0032] The start / stop button 40 is connected to the second input terminal of the PLC controller 10. As an example, when the start / stop button 40 is pressed (i.e., the packaging machine is turned on), the start / stop button 40 outputs a high level to the PLC controller 10; when the start / stop button 40 is released (i.e., the packaging machine is turned off), the start / stop button 40 outputs a low level to the PLC controller 10. The PLC controller 10 determines the overall status of the packaging machine based on the voltage output by the start / stop button 40.
[0033] The PLC controller 10 is connected to the working indicator light 23 on each safety interlock switch 20. The PLC controller 10 controls the lighting mode of the corresponding working indicator light according to the status of the packaging machine and the normally closed contact signal of each safety interlock switch 20.
[0034] As an example, in the stopped state, if the normally closed contact of the safety interlock switch 20 is open, the PLC controller 10 controls the corresponding indicator light to illuminate yellow. In the started and stopped states, if the normally closed contact of the safety interlock switch 20 is closed, the PLC controller 10 controls the corresponding indicator light to illuminate green. In the started state, if the normally closed contact of the safety interlock switch 20 is open, the PLC controller 10 controls the corresponding indicator light to illuminate red. At this time, the PLC controller 10 will automatically release the start / stop button to stop the machine.
[0035] Preferably, such as Figure 1 As shown, the safety interlock control device also includes a human-machine interface 30. As one embodiment, such as... Figure 3 As shown, the human-machine interface is equipped with a display screen 31, and an enable button 32 is provided on its side to control whether the human-machine interface starts working.
[0036] The human-machine interface 30 is connected to the normally closed contact 22 on each safety interlock switch 20. The human-machine interface 30 is also connected to the PLC controller 10. The PLC controller 10 controls the status display mode of the corresponding safety interlock switch on the human-machine interface 30 according to the status of the packaging machine and the normally closed contact signal of each safety interlock switch.
[0037] As an example, in the shutdown state, if the normally closed contact of safety interlock switch 20 is open, the PLC controller 10 controls the corresponding safety interlock switch on the HMI 30 to display yellow. In the power-on and shutdown states, if the normally closed contact of safety interlock switch 20 is closed, the PLC controller 10 controls the corresponding safety interlock switch on the HMI 30 to display green. In the power-on state, if the normally closed contact of safety interlock switch 20 is open, the PLC controller 10 controls the corresponding safety interlock switch on the HMI 30 to display red, at which point the PLC controller 10 will automatically pop up the start / stop button to achieve shutdown. When restarting after shutdown, if at least one normally closed contact of safety interlock switch 20 is open, the PLC controller controls the corresponding safety interlock switch on the HMI 30 to display flashing yellow, and simultaneously controls the corresponding work indicator light to flash yellow, and disables the start / stop button. After the user closes all the open safety interlock switches, the PLC controller 10 controls the start / stop button to become active again, and the user can start the machine by pressing the start / stop button again.
[0038] Preferably, the human-machine interface 30 also displays some information related to safety interlocks, such as the safety cover opening indication corresponding to the normally open contact action, the number of times a fault occurs, historical data, etc.
[0039] As one embodiment, the safety interlock switch 20 is a lockable limit switch, which includes a limit switch and an electromagnetic coil that controls the movement of the limit switch. When the packaging machine is running, the electromagnetic coil is de-energized, and the state of the limit switch cannot be changed; that is, it cannot be opened or closed. When the packaging machine is stopped, the electromagnetic coil is energized, and the state of the limit switch can be changed. Based on the above, the lockable limit switch prevents the user from operating the safety interlock switch when the machine is running, further ensuring the user's personal safety.
[0040] As an example, such as Figure 2 As shown, the PLC controller 10 is fixed inside the electrical control box 50, and the door is positioned on the main body of the electrical control box 50 by a door lock 58. A switching power supply 56 is also fixed inside the electrical control box 50, and the switching power supply 56 is connected to both the PLC controller 10 and the human-machine interface 30. An air switch 55 is also installed inside the electrical control box 50, and the air switch 55 is connected to the switching power supply 56. The air switch 55 is connected to an external power source through a terminal 53 and grounded through a grounding terminal 57. A rocker switch 54 is used to control whether the electrical control box 50 is powered on. The PLC controller 10 is connected to the human-machine interface 30 via a switch 51.
[0041] Preferably, such as Figure 2 As shown, the electrical control box 50 is equipped with a fan 52 to dissipate heat from the electrical control box 50.
[0042] Preferably, the safety interlock control device further includes an alarm, which is signal-connected to the PLC controller 10. When the machine is powered on or switching from a stopped state to a powered-on state, if at least one safety interlock switch is open, the PLC controller 10 will activate the alarm until all safety interlock switches are closed.
[0043] As an example, the alarm includes at least one of a sound alarm and a light alarm.
[0044] As an example, such as Figure 3 As shown, the alarm 60 is fixed on the top surface of the human-machine interface 30.
[0045] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.
Claims
1. A safety interlock control device for a packaging machine, characterized in that, This includes the PLC controller, start / stop buttons, and indicator lights on each safety interlock switch; The normally closed contact on each safety interlock switch is connected to one of the first input terminals of the PLC controller; The start / stop button is connected to the second input terminal of the PLC controller; The PLC controller is connected to the working indicator light signal, and the PLC controller controls the lighting mode of the working indicator light according to the status of the packaging machine and the normally closed contact signal of the safety interlock switch. The safety interlock control device of the packaging machine also includes a human-machine interface, which is connected to the normally closed contact on each safety interlock switch. The human-machine interface is connected to the PLC controller via signals. The PLC controller controls the status display mode of the corresponding safety interlock switch on the human-machine interface based on the status of the packaging machine and the normally closed contact signal of the safety interlock switch. The safety interlock control device of the packaging machine also includes an alarm, which is connected to the PLC controller via a signal. The PLC controller is connected to the human-machine interface via a switch.
2. The safety interlock control device of a packaging machine according to claim 1, characterized in that, The safety interlock switch includes a limit switch and an electromagnetic coil that controls the movement of the limit switch. The electromagnetic coil is signal-connected to the PLC controller.
3. The safety interlock control device of a packaging machine according to claim 1, characterized in that, The alarm device includes at least one of a sound alarm and a light alarm.
4. The safety interlock control device for a packaging machine according to claim 1, characterized in that, The alarm is fixed to the top surface of the human-machine interface.
5. The safety interlock control device for a packaging machine according to claim 1, characterized in that, The PLC controller is fixed in the electrical control box, which also contains a switching power supply. The switching power supply is connected to both the PLC controller and the human-machine interface.
6. A safety interlock control device for a packaging machine according to claim 5, characterized in that, The electrical control box is also equipped with an air switch, which is connected to the switching power supply and is connected to an external power source through a terminal block.
7. The safety interlock control device of a packaging machine according to claim 5, characterized in that, The electrical control box is equipped with a fan.