Shearing protection device of cold shearing machine

Abstract

The utility model relates to the technical field of cold shearing, in particular to a shearing protection device of a cold shearing machine, which comprises a clutch electromagnetic valve control loop and a brake electromagnetic valve control loop which are connected in parallel. And the clutch electromagnetic valve control loop and the brake electromagnetic valve control loop are respectively connected with the control unit. The utility model has the advantages that the normally open contact I of the relay KA1, the normally open contact I of the relay K2 and the coil of the relay K1 are connected in series to form a safety interlocking loop, and the design can effectively prevent the situation that the brake does not act but the clutch acts again; a normally open contact I of the relay KA2 is connected in series with a coil of the relay K2, and a normally open contact II of the relay KA1 is connected in parallel with a normally open contact of the relay KA2 I, so that the electromagnetic valve of the brake cannot be powered off when the electromagnetic valve of the clutch is powered on to work.

Description

Technical Field

[0001] This utility model relates to the field of cold shearing technology, and in particular to a shearing protection device for a cold shearing machine. Background Technology

[0002] As a key piece of equipment in the bar production line, the cold shear machine is mainly used to perform operations such as cutting, head cutting, and tail cutting on bars cooled on the cooling bed to meet production process requirements. Its normal operation is directly related to the efficiency of the entire production line and the product quality.

[0003] Cold shearing machines are typically driven by an electric motor, which rotates the crankshaft via a belt drive and gear drive system. This, in turn, causes the shear blades to move up and down in a linear motion to complete the shearing action. The coordination of the clutch and brake is crucial during the shearing process. When the shearing button is pressed, the brake should disengage first, followed by a delayed engagement of the clutch, causing the crankshaft to begin rotating and lowering the shear blades for shearing. After shearing is complete, the clutch disengages, the brake closes, the crankshaft stops rotating, and the shear blades return to their original highest position, ready for the next shearing operation.

[0004] However, in actual operation, the following problems may occur:

[0005] If the brake solenoid valve is damaged, the brake cannot be opened normally when the shearing button is pressed. At this time, the clutch is engaged. Due to the inertial force of the flywheel, the crankshaft will continue to drive the upper shear blade to fall. In this situation, the brake needs to stop and the clutch needs to operate. The two sides are in conflict, which can lead to damage to the clutch, brake, cold shear machine bearings and other components.

[0006] In addition, the main motor may be overloaded under such circumstances, which may lead to belt slippage and damage, or even serious consequences such as motor burnout. Utility Model Content

[0007] The purpose of this invention is to provide a shearing protection device for a cold shear machine, which prevents the clutch from engaging when the brake is not disengaged, thus avoiding the situation where force is applied from both sides simultaneously, thereby protecting equipment safety and improving production efficiency.

[0008] To achieve the above objectives, this utility model employs the following technical solution:

[0009] A shearing protection device for a cold shearing machine includes a clutch solenoid valve control circuit and a brake solenoid valve control circuit, which are connected in parallel. The clutch solenoid valve control circuit and the brake solenoid valve control circuit are respectively connected to a control unit.

[0010] The control unit includes a digital output module, which is connected to the coils of the relay group via ports. The normally open contacts of the relay group are connected to the clutch solenoid valve control circuit and the brake solenoid valve control circuit, respectively.

[0011] The relay group includes relay KA1. The clutch solenoid valve control circuit includes branch a and branch b connected in parallel. Branch a includes the normally open contact of relay KA1, the normally open contact of relay K2, and the coil of relay K1 connected in series. Branch b includes the normally open contact of relay K1 and the clutch solenoid valve connected in series.

[0012] The relay group also includes relay KA2. The brake solenoid valve control circuit includes branches c and d connected in parallel. Branch c includes the normally open contact of relay KA2 and the coil of relay K2 connected in series. The normally open contact of relay KA1 is connected in parallel with the normally open contact of relay KA2. Branch d includes the normally open contact of relay K2 and the brake solenoid valve connected in series.

[0013] It includes an air tank, a pressure reducing valve, a clutch solenoid valve, and a brake solenoid valve. The air tank is connected to the input end of the clutch solenoid valve and the input end of the pressure reducing valve through pipelines. The output end of the pressure reducing valve is connected to the input end of the brake solenoid valve through a pipeline. The output end of the clutch solenoid valve is connected to the clutch. The output end of the brake solenoid valve is connected to the clutch.

[0014] The control unit also includes a CPU module and a communication module, which are connected via ports.

[0015] The control unit is a PLC.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. By connecting the normally open contact 1 of relay KA1, the normally open contact 1 of relay K2, and the coil of relay K1 in series, a safety interlocking circuit is formed. This design can effectively prevent the clutch from operating when the brake is not activated. In practical applications, if the clutch operates while the brake is not working properly, it will cause equipment damage. This design ensures that the clutch is allowed to operate only after the brake is released, thus improving the safety of equipment operation.

[0018] 2. The structure of connecting the normally open contact 1 of relay KA2 and the coil of relay K2 in series, and connecting the normally open contact 2 of relay KA1 and the normally open contact 1 of relay KA2 in parallel, ensures that the brake solenoid valve will not be de-energized while the clutch solenoid valve is energized; thus avoiding the fault phenomenon of the brake and clutch seizing at the same time, reducing equipment downtime and maintenance costs.

[0019] 3. The PLC slave station and the PLC master station are connected through communication module 2. The PLC master station is connected to the HMI human-machine interface screen. Operators can view the operating information of the clutch solenoid valve and the brake solenoid valve at any time through the HMI human-machine interface screen, which facilitates the operation and management of the production plant.

[0020] 4. Once the touch screen is connected to the communication module, operators can view the operating information of the clutch solenoid valve and brake solenoid valve at any time through the touch screen, which is simple to maintain and saves time and effort.

[0021] 5. Record the closing data of relays KA1 and KA2 via the touch screen to provide strong data support for equipment maintenance and prevent relay failures. Attached Figure Description

[0022] Figure 1 This is the schematic diagram of the control circuit for the shearing protection device of a cold shear machine.

[0023] Figure 2 This is the PLC schematic diagram of the shearing protection device for a cold shear machine.

[0024] Figure 3 This is a schematic diagram of the shear protection device structure of a cold shear machine.

[0025] In the diagram: 1. Electric motor; 2. Clutch; 3. Belt drive system; 4. Gear drive system; 5. Brake; 6. Lower shear frame; 7. Upper shear blade; 8. Shear frame; 9. Crankshaft; 10. Clutch solenoid valve; 11. Brake solenoid valve; 12. Pressure reducing valve; 13. Air manifold. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0027] The following embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0028] Example 1

[0029] Before the upgrade, the PLC and relay group were existing equipment in the production workshop. After the upgrade, relays K1 and K2, pressure reducing valve 12, a touch screen, and communication module 1 were added. Two spare relays, KA1 and KA2, were used in the relay group. See... Figure 3A shearing protection device for a cold shearing machine includes a motor 1, a belt drive system 3, a gear drive system 4, a clutch 2, a brake 5, an air tank 13, a pressure reducing valve 12, a clutch solenoid valve 10, and a brake solenoid valve 11. The motor 1 drives the belt drive system 3, which in turn drives the gear drive system 4. The gear drive system 4 drives the cold shearing machine. The belt drive system 3 also drives the clutch 2, which in turn drives the main shaft. The brake 5 is mounted on the main shaft. The air tank 13 is connected to the input end of the clutch solenoid valve 10 and the input end of the pressure reducing valve 12 via pipelines. The output end of the pressure reducing valve 12 is connected to the input end of the brake solenoid valve 11 via a pipeline. The added pressure reducing valve 12 is used to reduce the air pressure difference between the clutch 2 and the brake 5 under the same air source. The output end of the clutch solenoid valve 10 is connected to the clutch 2, and the output end of the brake solenoid valve 11 is connected to the clutch 2.

[0030] See Figure 1 , Figure 2 Add a control circuit for the clutch solenoid valve 10 and a control circuit for the brake solenoid valve 11, and connect the control circuits for the clutch solenoid valve 10 and the brake solenoid valve 11 in parallel.

[0031] The clutch solenoid valve 10 control circuit includes branches a and b connected in parallel. Branch a includes the normally open contact one of relay KA1, the normally open contact one of relay K2, and the coil of relay K1 connected in series. Branch b includes the normally open contact one of relay K1 and the clutch solenoid valve 10 connected in series. The brake solenoid valve 11 control circuit includes branches c and d connected in parallel. Branch c includes the normally open contact one of relay KA2 and the coil of relay K2 connected in series. The normally open contact two of relay KA1 and the normally open contact one of relay KA2 are connected in parallel. Branch d includes the normally open contact two of relay K2 and the brake solenoid valve 11 connected in series.

[0032] The slave PLC includes a switching power supply, a CPU module, communication module 1, communication module 2, digital input module, digital output module, and a touch screen. The CPU module, communication module 1, communication module 2, digital input module, and digital output module are connected via ports. The switching power supply provides operating power. The touch screen is connected to communication module 1 via a port, and communication module 2 is connected to the PLC master station. The PLC master station receives data from the slave PLC and is connected to the HMI (Human-Machine Interface). The digital output modules are connected to the coils of relays KA1 and KA2 via ports. The normally open contacts 2 and 3 of relays K1, KA1, and KA2 are connected to the digital input modules via ports. Because the normally open contact 1 of relay K1 is connected to the clutch solenoid valve 10, closing the normally open contact 1 of relay K1 energizes and operates the clutch solenoid valve 10. The normally open contact 1 of relay K2 is connected to the brake solenoid valve 11. Closing the normally open contact 1 of relay K2 energizes and operates the brake solenoid valve 11. Operators can view the operating information of the clutch solenoid valve 10 and the brake solenoid valve 11 at any time via the touchscreen. The touchscreen displays clutch 2 start / stop buttons and brake 5 start / stop buttons. The PLC can energize or de-energize the coils of relays KA1 and KA2 based on the commands from these buttons. During maintenance, operators operate the clutch 2 start / stop buttons and brake 5 start / stop buttons. The PLC then sends commands to energize the coils of relays KA1 and KA2. The digital input module receives the data information from the closing of the normally open contacts of relays KA1 and KA2 and records this data via the touchscreen, providing strong data support for equipment maintenance and preventing relay failures.

[0033] Work process:

[0034] The gear transmission system 4 operates at high speed driven by the electric motor 1. The brake solenoid valve 11 is energized, changing from an open to a closed state. The pressure in the brake 5 air chamber is released, and the brake 5 transitions from a locked state to a relaxed state. Simultaneously, the normally open contact of the relay K2 controlling the brake solenoid valve 11 closes, providing the condition for the delayed closing of the clutch 2. If the normally open contact of relay K2 does not close, the next action of the clutch 2 will not proceed; see... Figure 1When the normally open contact of relay K2 closes, and after a delay, the normally open contact of relay KA1 closes, energizing the clutch solenoid valve 10 and causing it to switch from closed to open. Clutch 2 then locks under the action of compressed air. The gear transmission system 4, operating together with the crankshaft 9, completes the shearing action of the cold shear machine. After returning to the corresponding position, the PLC sends a command to de-energize relay KA1, de-energizing the clutch solenoid valve 10, causing it to switch from open to closed. This releases the compressed air from clutch 2, allowing clutch 2 to switch from a locked state to a closed state. In the relaxed state, the rotating gear transmission system 4 is separated from the main shaft. When the clutch 2 is energized, the normally open contact of relay KA1 simultaneously holds the coil of relay KA2 of brake solenoid valve 11, ensuring that brake solenoid valve 11 will not be de-energized during the operation of clutch solenoid valve 10, thus preventing the brake 5 and clutch 2 from simultaneously seizing up. When brake solenoid valve 11 is de-energized, it changes from closed to open, and brake 5 seizes up under the action of compressed air, stopping the cold shear machine in a fixed position to prepare for the next shearing operation.

[0035] This invention forms a safety interlocking circuit by connecting the normally open contact 1 of relay KA1, the normally open contact 1 of relay K2, and the coil of relay K1 in series. This design effectively prevents the clutch from engaging when the brake is not activated. In practical applications, if the clutch engages while the brake is not functioning properly, it can lead to equipment damage. This design ensures that the clutch is only allowed to engage after the brake is released, thus improving the safety of equipment operation. The structure of connecting the normally open contact 1 of relay KA2 and the coil of relay K2 in series, and connecting the normally open contact 2 of relay KA1 and the normally open contact 1 of relay KA2 in parallel, ensures that the brake solenoid valve does not engage while the clutch solenoid valve is energized. It features a power-off function, preventing the brake and clutch from simultaneously seizing up and locking, thus reducing equipment downtime and maintenance costs. The PLC slave station connects to the PLC master station via communication module two, and the PLC master station connects to the HMI (Human-Machine Interface) screen. Operators can view the operating information of the clutch and brake solenoid valves at any time through the HMI screen, facilitating production plant operation management. The touchscreen connects to communication module one, allowing operators to view the operating information of the clutch and brake solenoid valves at any time, simplifying maintenance and saving time and effort. The touchscreen records the closing data of relays KA1 and KA2, providing strong data support for equipment maintenance and preventing relay failures.

Claims

1. A shearing protection device for a cold shear machine, characterized in that, It includes a clutch solenoid valve control circuit and a brake solenoid valve control circuit, which are connected in parallel. The clutch solenoid valve control circuit and the brake solenoid valve control circuit are respectively connected to the control unit. The control unit includes a digital output module, which is connected to the coils of the relay group via ports. The normally open contacts of the relay group are connected to the clutch solenoid valve control circuit and the brake solenoid valve control circuit, respectively.

2. The shearing protection device for a cold shear machine according to claim 1, characterized in that, The relay group includes relay KA1, and the clutch solenoid valve control circuit includes branch a and branch b connected in parallel. Branch a includes the normally open contact of relay KA1, the normally open contact of relay K2, and the coil of relay K1 connected in series. Branch b includes the normally open contact of relay K1 and the clutch solenoid valve connected in series.

3. The shearing protection device for a cold shear machine according to claim 1, characterized in that, The relay group also includes relay KA2. The brake solenoid valve control circuit includes branches c and d connected in parallel. Branch c includes the normally open contact of relay KA2 and the coil of relay K2 connected in series. The normally open contact of relay KA1 is connected in parallel with the normally open contact of relay KA2. Branch d includes the normally open contact of relay K2 and the brake solenoid valve connected in series.

4. The shearing protection device for a cold shear machine according to claim 1, characterized in that, It includes an air tank, a pressure reducing valve, a clutch solenoid valve, and a brake solenoid valve. The air tank is connected to the input end of the clutch solenoid valve and the input end of the pressure reducing valve through pipelines. The output end of the pressure reducing valve is connected to the input end of the brake solenoid valve through a pipeline. The output end of the clutch solenoid valve is connected to the clutch. The output end of the brake solenoid valve is connected to the clutch.

5. A shearing protection device for a cold shear machine according to claim 1, characterized in that, The control unit also includes a CPU module and a communication module, which are connected via ports.

6. A shearing protection device for a cold shear machine according to claim 5, characterized in that, The control unit is a PLC.

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