Safety control system of injection molding machine

Abstract

The utility model relates to the field of injection molding machine control, and discloses a safety control system of an injection molding machine, when a safety PLC (4) controls an on-off device (8) to cut off voltage VCC, a power supply end (6) loses power, so that all signal output ends (7) in a signal output module (5) stop outputting control signals, corresponding action valves (1) stop running, and the safety of the injection molding machine is ensured. Compared with the prior art that a signal loop between each action valve (1) and the computer controller (3) is directly cut off, the safety PLC (4) only needs to plan a safety contact (10) for each signal output module (5), and then the power supply of the signal output module (5) is cut off through the safety contact (10), so that the safety control system of the injection molding machine can be used for controlling the operation of the injection molding machine. Therefore, the purpose of safety protection is achieved. Therefore, the occupation amount of the safety contacts (10) of the safety PLC (4) can be effectively reduced, so that the use number of the expansion modules (9) is reduced, the circuit can be simplified, the occupation amount in the injection molding machine control cabinet can be reduced, the installation cost can be reduced, and the injection molding machine control cabinet is more humanized.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine control, and in particular to a safety control system for injection molding machines. Background Technology

[0002] Injection molding machines are high-voltage, high-speed, and high-temperature devices, posing a significant risk, and safety precautions cannot be taken lightly. The main hazards posed by injection molding machines to personnel are concentrated in the mold clamping area, injection nozzle area, and material feeding area, potentially causing mechanical or thermal injuries. Therefore, improving the safety performance of injection molding machines has become a top priority in the industry.

[0003] like Figure 1 The diagram shows the architecture of a safety control system for an injection molding machine in the prior art. It mainly includes a safety monitoring switch group 2, a computer controller 3 and a safety PLC 4 coupled to the safety monitoring switch group 2, and multiple actuating valves 1 coupled to and controlled by the computer controller 3. The safety monitoring switch group 2 includes multiple safety monitoring switches installed at various safety positions on the injection molding machine. These switches can send position signals to the computer controller 3, enabling the computer controller 3 to send control signals to the corresponding actuating valve 1 based on the position signals, thereby driving the actuating valve 1 to operate and controlling the injection molding machine to complete the corresponding actions.

[0004] To reduce the error rate of the injection molding machine, multiple safety contacts 10 on the safety PLC4 are connected in series in the signal receiving circuit of each actuating valve 1. During operation, the safety PLC4 can acquire the position signals of each safety monitoring switch, and when an abnormal position signal occurs, it controls the corresponding safety contact 10 to cut off the signal receiving circuit of the corresponding actuating valve 1. This prevents the injection molding machine from performing dangerous actions if several safety positions are not reached, thereby improving safety.

[0005] However, in actual use, due to the limited size of the safety PLC4 itself, additional expansion modules 9 are usually required to increase the number of contacts. Since a single injection molding machine requires a large number of safety contacts 10, many expansion modules 9 need to be added. This not only increases the complexity of the wiring and the internal space occupied by the injection molding machine control cabinet, but also increases the installation cost, thus requiring further improvement. Utility Model Content

[0006] This invention addresses the shortcomings of existing technologies by providing a safety control system for injection molding machines. It effectively reduces the number of safety contacts occupied by the safety PLC, thereby reducing the number of expansion modules required. This not only simplifies the wiring and reduces the amount of space occupied in the injection molding machine control cabinet, but also lowers installation costs.

[0007] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0008] A safety control system for an injection molding machine includes several actuating valves, a safety monitoring switch group, and a computer controller and a safety PLC coupled to the safety monitoring switch group. The computer controller is equipped with at least one signal output module, which includes a power supply terminal and several signal output terminals sharing a common power supply terminal. The power supply terminal is coupled to a voltage VCC. The actuating valves are individually coupled to and controlled by the signal output terminals. The voltage VCC supplies power to the signal output terminals through the power supply terminal, enabling the signal output terminals to respond to the computer controller by outputting control signals, thereby driving the corresponding actuating valves to operate. A switching device coupled to and controlled by the safety PLC is provided between the voltage VCC and the power supply terminal. When the safety PLC controls the switching device to cut off the voltage VCC, the power supply terminal loses power, causing all signal output terminals in the signal output module to stop outputting control signals, thereby stopping the corresponding actuating valves from operating.

[0009] Preferably, the switching device is a normally open contact coupled to and controlled by a safety PLC, which is connected in series in the path between the voltage VCC and the power supply terminal.

[0010] Preferably, the normally open contact is integrated into an expansion module, which is coupled to and controlled by a safety PLC.

[0011] Preferably, the safety monitoring switch group includes multiple safety monitoring switches installed at various safety positions of the injection molding machine. The multiple safety monitoring switches are coupled to the computer controller and the safety PLC to send position signals to the computer controller and the safety PLC.

[0012] This utility model, by adopting the above technical solution, has significant technical effects: Since a single power supply terminal can simultaneously supply power to multiple signal output terminals on the computer controller, when the power supply voltage VCC of the power supply terminal is cut off, the multiple signal output terminals associated with it can simultaneously lose power, thereby cutting off the control signals on the signal output terminals and preventing the actuating valves from performing dangerous actions. Compared to existing technologies that directly cut off the signal circuit between each actuating valve and the computer controller, the safety PLC only needs to plan one safety contact for each signal output module, and then cut off the power supply to the signal output module through this safety contact, thereby achieving the purpose of safety protection. This effectively reduces the number of safety contacts occupied by the safety PLC, thereby reducing the number of expansion modules required. It not only simplifies the wiring and reduces the space occupied in the injection molding machine control cabinet, but also reduces installation costs and is more user-friendly. Attached Figure Description

[0013] Figure 1 This is an architecture diagram of a safety control system for injection molding machines in the existing technology;

[0014] Figure 2 This is a system architecture diagram for this embodiment.

[0015] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Actuating valve; 2. Safety monitoring switch group; 3. Computer controller; 4. Safety PLC; 5. Signal output module; 6. Power supply terminal; 7. Signal output terminal; 8. On / off device; 9. Expansion module; 10. Safety contact. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0017] like Figure 2 As shown, this embodiment discloses a safety control system for an injection molding machine, including a plurality of actuating valves 1, a safety monitoring switch group 2, and a computer controller 3 and a safety PLC 4 coupled to the safety monitoring switch group 2. The computer controller 3 is equipped with at least one signal output module 5, which includes a power supply terminal 6 and a plurality of signal output terminals 7 sharing the power supply terminal 6. The power supply terminal 6 is coupled to a voltage VCC. The plurality of actuating valves 1 are individually coupled to and controlled by the plurality of signal output terminals 7. The voltage VCC supplies power to the plurality of signal output terminals 7 through the power supply terminal 6, enabling the signal output terminals 7 to respond to the control signals output by the computer controller 3, thereby driving the corresponding actuating valve 1 to operate, and thus controlling the injection molding machine to perform corresponding steps.

[0018] To reduce the error rate of the injection molding machine, an on / off device 8, coupled to and controlled by a safety PLC 4, is installed between the voltage VCC and the power supply terminal 6. The on / off device 8 is a normally open contact coupled to and controlled by the safety PLC 4, connected in series in the path between the voltage VCC and the power supply terminal 6. In this embodiment, when the safety PLC 4 controls the on / off device 8 to cut off the voltage VCC, the power supply terminal 6 loses power, causing all signal output terminals 7 in the signal output module 5 to stop outputting control signals. This stops the corresponding actuation valve 1 from operating, thereby preventing the injection molding machine from performing dangerous actions.

[0019] To facilitate the expansion of the on / off device 8 in the safety PLC4, the normally open contact is integrated into an expansion module 9, which is coupled to and controlled by the safety PLC4.

[0020] To enhance the monitoring range of the safety monitoring switch group 2, the safety monitoring switch group 2 includes multiple safety monitoring switches installed at various safety positions of the injection molding machine. The multiple safety monitoring switches are coupled to the computer controller 3 and the safety PLC 4 to send position signals to the computer controller 3 and the safety PLC 4.

[0021] The specific working principle is as follows:

[0022] During the operation of the injection molding machine, the safety PLC4 can acquire the position signals of each safety monitoring switch. When the position signal is abnormal, it controls the on / off device 8 to cut off the voltage VCC on the signal output module 5, so that the power supply terminal 6 in the signal output module 5 loses power. This causes all the signal output terminals 7 in the signal output module 5 to stop outputting control signals, thereby stopping the corresponding action valves 1 from operating and preventing the injection molding machine from performing dangerous actions.

[0023] Compared to existing technologies that directly cut off the signal circuit between each actuating valve 1 and the computer controller 3, the safety PLC 4 only needs to designate one safety contact 10 for each signal output module 5, and then cut off the power supply to the signal output module 5 through this safety contact 10, thereby achieving the purpose of safety protection. This effectively reduces the number of safety contacts 10 occupied by the safety PLC 4, thereby reducing the number of expansion modules 9 required. This not only simplifies the wiring and reduces the space occupied within the injection molding machine control cabinet, but also lowers installation costs and is more user-friendly.

Claims

1. A safety control system for an injection molding machine, comprising a plurality of actuating valves (1), a safety monitoring switch group (2), and a computer controller (3) and a safety PLC (4) coupled to the safety monitoring switch group (2), characterized in that: The computer controller (3) is equipped with at least one signal output module (5). The signal output module (5) includes a power supply terminal (6) and several signal output terminals (7) sharing the power supply terminal (6). The power supply terminal (6) is coupled to the voltage VCC. Several actuating valves (1) are coupled to and controlled by several signal output terminals (7). The voltage VCC supplies power to several signal output terminals (7) through the power supply terminal (6) so that the signal output terminals (7) can respond to the computer controller (3) to output control signals, thereby driving the corresponding actuating valves (1) to run. A switching device (8) coupled to and controlled by the safety PLC (4) is provided between the voltage VCC and the power supply terminal (6). When the safety PLC (4) controls the switching device (8) to cut off the voltage VCC, the power supply terminal (6) loses power, so that all the signal output terminals (7) in the signal output module (5) stop outputting control signals, thereby stopping the corresponding actuating valves (1) from running.

2. The injection molding machine safety control system according to claim 1, characterized in that: The switching device (8) is a normally open contact coupled to and controlled by the safety PLC (4), which is connected in series between the voltage VCC and the power supply terminal (6).

3. The injection molding machine safety control system according to claim 2, characterized in that: Normally open contacts are integrated into an expansion module (9), which is coupled to and controlled by a safety PLC (4).

4. A safety control system for an injection molding machine according to claim 1, 2, or 3, characterized in that: The safety monitoring switch group (2) includes multiple safety monitoring switches installed at various safety positions of the injection molding machine. The multiple safety monitoring switches are coupled to the computer controller (3) and the safety PLC (4) to send position signals to the computer controller (3) and the safety PLC (4).

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