Safety interlocking system for maintenance door of cut tobacco cutter

Abstract

The invention discloses a safety interlocking system for a maintenance door of a cut tobacco cutter. The safety interlocking system comprises an induction contact, a door magnetic inductor, a PLC and a power supply relay. The induction contact is arranged at a handle of the maintenance door, the door magnetic inductor is arranged on a door frame of the maintenance door, when the maintenance door and the door frame are closed, the induction contact is in contact with the door magnetic inductor in an attached mode, and when the maintenance door and the door frame are opened, the induction contact is not in contact with the door magnetic inductor. The door magnetic sensor is connected in series between the output end of the PLC and the control end of the power supply relay, the input end of the power supply relay is connected with the power supply, and the output end of the power supply relay is connected with the power supply end of the tobacco cutter. When the maintenance door and the door frame are opened, the electrical connection between the PLC and the power supply relay is disconnected through the door magnetic sensor, the power supply relay is in a disconnected state, and then the tobacco cutter is shut down. The safety of tobacco cutter maintenance can be improved, and production hidden dangers are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of safety interlocking of a tobacco cutting machine, and more particularly to a safety interlocking system for a maintenance door of a tobacco cutting machine. Background Art

[0002] Cutting is an important process that affects the quality of tobacco, and the function and precision of the cutting equipment are the key to ensuring the quality of the cutting process. The side maintenance doors of the cutter rollers of the SQ215D and SQ22X series cutters currently used in cigarette factories use acrylic or stainless steel stripes as the maintenance door opening panels, which are fixed with stainless steel screws. This simple mechanical structure may cause serious safety accidents when maintenance personnel are performing maintenance on the side. If the maintenance personnel make a mistake and accidentally start the cutter roller or open the side maintenance door when the cutter roller rotates, it will not only endanger the lives of personnel but also cause damage to the equipment, becoming a major source of danger at the cutter site. Therefore, it is of great significance to interlock the operation signals of the cutter to protect the safe operation of maintenance personnel. Summary of the invention

[0003] The invention provides a safety interlock system for a maintenance door of a tobacco cutter, which solves the problem that the maintenance door of the existing cutter lacks signal interlock control when opened, which easily causes serious safety accidents, can improve the safety of the cutter maintenance, and reduce production risks.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A safety interlock system for a maintenance door of a tobacco cutting machine, comprising: an inductive contact, a door magnetic sensor, a PLC controller and a power supply relay;

[0006] The induction contact is arranged at the handle of the maintenance door, and the door magnetic sensor is arranged on the door frame of the maintenance door. When the maintenance door and the door frame are closed, the induction contact and the door magnetic sensor are in contact with each other, and when the maintenance door and the door frame are opened, the induction contact and the door magnetic sensor are out of contact.

[0007] The door magnetic sensor is connected in series between the output end of the PLC controller and the control end of the power supply relay, the input end of the power supply relay is connected to the power supply, and the output end of the power supply relay is connected to the power supply end of the wire cutter;

[0008] When the maintenance door and the door frame are open, the door magnetic sensor disconnects the electrical connection between the PLC controller and the power supply relay, so that the power supply relay is in an off state, thereby stopping the wire cutter.

[0009] Preferably, it also includes: an emergency stop switch;

[0010] The emergency stop switch is connected in series between the output end of the PLC controller and the control end of the power supply relay. When the emergency stop switch is pressed, the electrical connection between the PLC controller and the power supply relay is disconnected, so that the power supply relay is in an off state.

[0011] Preferably, the power supply relay is a normally open relay.

[0012] Preferably, it also includes: a touch screen;

[0013] The touch screen is signal-connected to the PLC controller. A human-computer interaction operation interface is provided on the touch screen. When the human-computer interaction operation interface is in a maintenance-on mode, the output end of the PLC controller outputs a low level, so that the power supply relay is in a disconnected state.

[0014] Preferably, a reed switch is provided in the door magnetic sensor, and the reed switch is connected in series between the output end of the PLC controller and the control end of the power supply relay, so as to control the on and off of the electrical connection between the PLC controller and the power supply relay.

[0015] Preferably, the induction contact is a permanent magnet, and when the induction contact is in close contact with the door magnetic sensor, the reed switch is turned on, and when the induction contact is out of contact with the door magnetic sensor, the reed switch is turned off.

[0016] Preferably, the induction contact is arranged on the inner side of the maintenance door.

[0017] Preferably, one end of the sensing contact is connected to one end of a connecting screw, and the other end of the connecting screw is connected to a handle on the outside of the maintenance door. When the handle is rotated, the connecting screw rotates to make the sensing contact come into contact with or out of contact with the corresponding door magnetic sensor.

[0018] Preferably, it also includes: an alarm device;

[0019] The alarm device is connected to the PLC controller by signal, and the PLC controller controls the alarm device to sound an alarm when the maintenance door is opened.

[0020] Preferably, the alarm device includes at least any one of the following: an indicator light, a buzzer and an audible and visual alarm.

[0021] The present invention provides a safety interlock system for a maintenance door of a tobacco cutter. An induction contact is arranged at the handle of the maintenance door, and a door magnetic sensor is arranged on the door frame. When the door magnetic sensor loses contact with the induction contact, the power supply relay is disconnected to stop the cutter. The problem that the maintenance door of the existing cutter lacks signal interlock control when opening, which easily causes serious safety accidents, can be solved. The safety of the cutter maintenance can be improved, and production hidden dangers can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0023] Figure 1 The present invention is a schematic diagram of a safety interlocking system for a maintenance door of a tobacco cutter. DETAILED DESCRIPTION

[0024] In order to enable persons skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0025] In view of the problem that the maintenance door of the current tobacco cutter lacks signal interlock control when opening, which may easily cause serious safety accidents, the present invention provides a safety interlock system for the maintenance door of a tobacco cutter, which solves the problem that the maintenance door of the existing tobacco cutter lacks signal interlock control when opening, which may easily cause serious safety accidents. The system can improve the safety of the maintenance of the cutter and reduce production risks.

[0026] like Figure 1 As shown, a safety interlock system for the maintenance door of a tobacco cutter includes: an inductive contact, a door magnetic sensor, a PLC controller and a power supply relay. The inductive contact is arranged at the handle of the maintenance door, and the door magnetic sensor is arranged on the door frame of the maintenance door. When the maintenance door and the door frame are closed, the inductive contact and the door magnetic sensor are in contact with each other, and when the maintenance door and the door frame are open, the inductive contact and the door magnetic sensor are out of contact. The door magnetic sensor is connected in series between the output end of the PLC controller and the control end of the power supply relay, the input end of the power supply relay is connected to the power supply, and the output end of the power supply relay is connected to the power supply end of the cutter. When the maintenance door and the door frame are open, the door magnetic sensor disconnects the electrical connection between the PLC controller and the power supply relay, so that the power supply relay is in an off state, thereby stopping the cutter.

[0027] Specifically, when the inductive contact is in contact with the door magnetic sensor, the door magnetic sensor conducts the electrical connection between the output end of the PLC controller and the control end of the power supply relay, so that the power supply relay is closed, and the power supply supplies power to the wire cutter. When the maintenance door is opened, the inductive contact is disengaged from the door magnetic sensor, and the door magnetic sensor disconnects the electrical connection between the output end of the PLC controller and the control end of the power supply relay, so that the power supply relay is in an open state, and the wire cutter stops. The system can disconnect the power supply of the wire cutter when the maintenance door is opened, so that the wire cutter stops, avoiding safety hazards.

[0028] The system also includes: an emergency stop switch; the emergency stop switch is connected in series between the output end of the PLC controller and the control end of the power supply relay. When the emergency stop switch is pressed, the electrical connection between the PLC controller and the power supply relay is disconnected, so that the power supply relay is in a disconnected state.

[0029] In practical applications, the door magnetic sensor is connected in series in the emergency stop switch circuit, so that the emergency stop switch and the door magnetic sensor are connected in series. When the emergency stop switch or the door magnetic sensor is disconnected, the power supply relay is disconnected to stop the power supply to the wire cutter.

[0030] Furthermore, the power supply relay is a normally open relay.

[0031] The system also includes: a touch screen; the touch screen is signal-connected to the PLC controller, and a human-computer interaction operation interface is provided on the touch screen. When the human-computer interaction operation interface is in a maintenance start mode, the output end of the PLC controller outputs a low level, so that the power supply relay is in a disconnected state.

[0032] In actual application, the operator selects the maintenance start mode through the touch screen. At this time, the wire cutter needs to be shut down and powered off. The touch screen sends a maintenance start signal to the PLC controller. The PLC controller outputs a low level, causing the power supply relay to disconnect the electrical connection between the power supply and the wire cutter, shutting down the wire cutter.

[0033] Furthermore, a reed switch is provided in the door magnetic sensor, and the reed switch is connected in series between the output end of the PLC controller and the control end of the power supply relay, and is used to control the on and off of the electrical connection between the PLC controller and the power supply relay.

[0034] Furthermore, the induction contact is a permanent magnet, and when the induction contact is in close contact with the door magnetic sensor, the reed switch is turned on, and when the induction contact is out of contact with the door magnetic sensor, the reed switch is turned off.

[0035] In actual applications, when the inductive contact of the reed switch is in contact with the door magnetic sensor, the two metal reeds in the reed switch are turned on, so that the door magnetic sensor turns on the electrical connection between the output end of the PLC controller and the control end of the power supply relay. When the inductive contact of the reed switch is out of contact with the door magnetic sensor, the two metal reeds in the reed switch separate, so that the door magnetic sensor disconnects the electrical connection between the output end of the PLC controller and the control end of the power supply relay.

[0036] Furthermore, the induction contact is arranged on the inner side of the maintenance door.

[0037] Furthermore, one end of the sensing contact is connected to one end of a connecting screw, and the other end of the connecting screw is connected to a handle on the outside of the maintenance door. When the handle is rotated, the connecting screw rotates, causing the sensing contact to come into contact with or out of contact with the corresponding door magnetic sensor.

[0038] In actual application, the handle is a manual ball twist. When the operator twists the manual ball twist to open the maintenance door, the connecting screw on the inside of the door comes out of the threaded hole, and the induction contact connected to the threaded rod is detached from the door magnetic sensor. At this time, the door magnetic sensor sends a signal through the wire connected to the PLC, triggering the emergency stop circuit of the wire cutter. The wire cutter stops urgently and cannot be restarted.

[0039] The system also includes: an alarm device; the alarm device is connected to the PLC controller by signal, and the PLC controller controls the alarm device to sound an alarm when the maintenance door is opened.

[0040] Furthermore, the alarm device includes at least any one of the following: an indicator light, a buzzer, and an audible and visual alarm.

[0041] It can be seen that the present invention provides a safety interlock system for the maintenance door of a tobacco cutter. An induction contact is arranged at the handle of the maintenance door, and a door magnetic sensor is arranged on the door frame. The door magnetic sensor disconnects the power supply relay when it loses contact with the induction contact, so that the cutter is shut down. This solves the problem that the maintenance door of the existing cutter lacks signal interlock control when opening, which may easily cause serious safety accidents. It can improve the safety of cutter maintenance and reduce production risks.

[0042] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A safety interlock system for a maintenance door of a tobacco cutting machine, characterized in that: include: Inductive contacts, door magnetic sensors, PLC controllers and power supply relays; The induction contact is arranged at the handle of the maintenance door, and the door magnetic sensor is arranged on the door frame of the maintenance door. When the maintenance door and the door frame are closed, the induction contact and the door magnetic sensor are in contact with each other, and when the maintenance door and the door frame are opened, the induction contact and the door magnetic sensor are out of contact. The door magnetic sensor is connected in series between the output end of the PLC controller and the control end of the power supply relay, the input end of the power supply relay is connected to the power supply, and the output end of the power supply relay is connected to the power supply end of the wire cutter; When the maintenance door and the door frame are open, the door magnetic sensor disconnects the electrical connection between the PLC controller and the power supply relay, so that the power supply relay is in an off state, thereby stopping the wire cutter.

2. The safety interlock system for the maintenance door of a tobacco cutter according to claim 1, characterized in that: Also includes: Emergency stop switch; The emergency stop switch is connected in series between the output end of the PLC controller and the control end of the power supply relay. When the emergency stop switch is pressed, the electrical connection between the PLC controller and the power supply relay is disconnected, so that the power supply relay is in an off state.

3. The safety interlock system for the maintenance door of a tobacco cutter according to claim 2, characterized in that: The power supply relay is a normally open relay.

4. The safety interlock system for the maintenance door of a tobacco cutter according to claim 3, characterized in that: Also includes: touchscreen; The touch screen is signal-connected to the PLC controller. A human-computer interaction operation interface is provided on the touch screen. When the human-computer interaction operation interface is in a maintenance-on mode, the output end of the PLC controller outputs a low level, so that the power supply relay is in a disconnected state.

5. The safety interlock system for the maintenance door of a tobacco cutter according to claim 4, characterized in that: A reed switch is provided in the door magnetic sensor, and the reed switch is connected in series between the output end of the PLC controller and the control end of the power supply relay, and is used to control the on and off of the electrical connection between the PLC controller and the power supply relay.

6. The safety interlock system for the maintenance door of a tobacco cutter according to claim 5, characterized in that: The induction contact is a permanent magnet. When the induction contact is in close contact with the door magnetic sensor, the reed switch is turned on. When the induction contact is out of contact with the door magnetic sensor, the reed switch is turned off.

7. The safety interlock system for the maintenance door of a tobacco cutter according to claim 6, characterized in that: The induction contact is arranged on the inner side of the maintenance door.

8. The safety interlock system for the maintenance door of a tobacco cutter according to claim 7, characterized in that: One end of the sensing contact is connected to one end of the connecting screw, and the other end of the connecting screw is connected to the handle on the outside of the maintenance door. When the handle is rotated, the connecting screw rotates to make the sensing contact come into contact with or out of contact with the corresponding door magnetic sensor.

9. The safety interlock system for the maintenance door of a tobacco cutter according to claim 8, characterized in that: Also includes: Alarm device; The alarm device is connected to the PLC controller by signal, and the PLC controller controls the alarm device to sound an alarm when the maintenance door is opened.

10. The safety interlock system for the maintenance door of a tobacco cutter according to claim 9, characterized in that: The alarm device includes at least any one of the following: an indicator light, a buzzer and an audible and visual alarm.

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