Anti-misoperation control circuit for rolling mill journal sticking device

Abstract

The utility model relates to an anti-misoperation rolling mill journal sticking device control circuit, which comprises a first switch and a second switch, relays comprise a holding relay and a loosening relay, the first switch comprises a normally open contact 1 and a normally closed contact 1, the second switch comprises a normally open contact 2 and a normally closed contact 2, the normally open contact 1 and the normally open contact 2 are connected in series, and the normally open contact 1 and the normally closed contact 2 are connected in parallel. The other end of the normally-open contact 1 is connected with a power supply, the other end of the normally-open contact 2 is connected with a coil of a holding relay, the normally-closed contact 1 and the normally-closed contact 2 are connected in series, the other end of the normally-closed contact 1 is connected with the power supply, and the other end of the normally-closed contact 2 is connected with a coil of a loosening relay; a normally open contact of the clasping relay is connected with one coil of the electromagnetic reversing valve, and the loosening relay is connected with the other coil of the electromagnetic reversing valve. In the roller changing operation, the shaft holding device can act only when two workers operate the first switch and the second switch at the same time, and misoperation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling mill control, and particularly relates to an anti-misoperation control circuit for a rolling mill shaft holding device. Background Art

[0002] A shaft holding device is installed on the main drive shaft of a rolling mill, and its function is to tightly hold the main drive shaft during roll change and release the main drive shaft after the roll change is completed. The existing control circuit for the shaft holding device includes a switch, a relay, and a solenoid directional valve. By opening and closing the switch, the energization state of the relay is controlled, thereby controlling the solenoid directional valve. The solenoid directional valve is connected to the shaft holding device to control the tightening and loosening of the shaft holding device. The original control switch for the rolling mill shaft holding device was installed on the operating side console, and the shaft holding device was installed on the drive side, resulting in the operators on the operating side being unable to observe the roll change situation on the drive side. Personnel on the drive side need to prompt the operators to operate, which leads to a longer roll change time. When an emergency occurs and it is too late to remind the operators to operate, or when the operation instructions are unclear, misoperation by the operators may cause injury to the staff on the drive side.

[0003] In order to improve the roll change efficiency and avoid misoperation, it is urgent to improve the existing circuit. Summary of the Invention

[0004] In order to solve the problem of misoperation of the existing rolling mill shaft holding device control, the utility model provides an anti-misoperation control circuit for a rolling mill shaft holding device, which includes a first switch and a second switch. The first switch and the second switch are respectively arranged on the operating side and the drive side. During roll change operation, the shaft holding device will only act when two staff members operate the first switch and the second switch simultaneously, thus avoiding misoperation.

[0005] To achieve the above object, the utility model provides an anti-misoperation control circuit for a rolling mill shaft holding device, which includes a switch, a relay, a solenoid directional valve, and a shaft holding device. The switch includes a first switch and a second switch. The relay includes a tightening relay and a releasing relay. The first switch includes a normally open contact 1 and a normally closed contact 1. The second switch includes a normally open contact 2 and a normally closed contact 2. The normally open contact 1 and the normally open contact 2 are connected in series, and the other end of the normally open contact 1 is connected to the power supply. The other end of the normally open contact 2 is connected to the coil of the tightening relay. The normally closed contact 1 and the normally closed contact 2 are connected in series, and the other end of the normally closed contact 1 is connected to the power supply. The other end of the normally closed contact 2 is connected to the coil of the releasing relay;

[0006] The normally open contact of the tightening relay is connected to one coil of the solenoid directional valve, and the releasing relay is connected to the other coil of the solenoid directional valve;

[0007] The solenoid directional valve is connected to the power supply through the normally open contact of the tightening relay or the normally open contact of the releasing relay.

[0008] Furthermore, both the first switch and the second switch include two-position self-locking rotary switches, where the normally open contact 1 and the normally closed contact 1 of the first switch are interlocked, and the normally open contact 2 and the normally closed contact 2 of the second switch are interlocked.

[0009] The normally open contact 1 and the normally closed contact 1 of the first switch are interlocked, and the normally open contact 2 and the normally closed contact 2 are interlocked. The contacts of both the first switch and the second switch can only be in one state, further avoiding misoperations.

[0010] Furthermore, the electromagnetic directional valve includes a two-position three-way solenoid valve.

[0011] Furthermore, the shaft-holding device is connected to a hydraulic pipeline through the two-position three-way solenoid valve.

[0012] Furthermore, both the first switch and the second switch are provided with operation panels, and the operation panel includes a bracket, a wiring panel, and a protective cover;

[0013] The bracket is an inverted T-shaped structure. A protective cover is provided at the upper end of the bracket. The protective cover is fixed to the bracket by bolts. A wiring panel is provided inside the protective cover. The wiring panel is fixed to the protective cover, and the first switch or the second switch is provided on the wiring panel.

[0014] The protective cover is provided to protect the first switch and the second switch, and the bracket is provided to fix the protective cover, facilitating operation by the staff.

[0015] Through the above technical solutions, the beneficial effects of the present utility model are as follows:

[0016] The present utility model can effectively avoid misoperations. The switch includes a first switch and a second switch. The normally open contact 1 and the normally open contact 2 are in series, and the normally closed contact 1 and the normally closed contact 2 are in series. Only when the normally open contact 1 of the first switch and the normally open contact 2 of the second switch are both closed, can the coil of the holding relay be energized. Similarly, only when the normally closed contact 1 and the normally closed contact 2 are both closed simultaneously, can the coil of the releasing relay be energized. The normally open contact 1 and the normally closed contact 1 are interlocked, and the normally open contact 2 and the normally closed contact 2 are interlocked. Misoperations will not occur. The circuit is changed from the original single-person operation to a two-person operation. If any one person does not operate, the shaft-holding device will not act, effectively avoiding the situation of misoperation and hurting people. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the circuit diagram of a control circuit for an anti-misoperation mill shaft-holding device of the present utility model;

[0018] Figure 2 is the structural schematic diagram of a control circuit for an anti-misoperation mill shaft-holding device of the present utility model.

[0019] Reference numerals: 1 is the first switch, 2 is the second switch, 3 is the holding relay, 4 is the releasing relay, 5 is the electromagnetic directional control valve, 6 is the shaft holding device, 7 is the bracket, 8 is the protective cover, and 9 is the wiring panel. Detailed implementation manners

[0020] The present utility model will be further described below in conjunction with the accompanying drawings and specific implementation manners:

[0021] Embodiment 1

[0022] As Figures 1 - 2 shown, an anti-misoperation shaft holding device control circuit for a rolling mill includes a switch, a relay, an electromagnetic directional control valve 5 and a shaft holding device 6. The switch includes a first switch 1 and a second switch 2. The relay includes a holding relay 3 and a releasing relay 4. The first switch 1 includes a normally open contact 1 and a normally closed contact 1. The second switch 2 includes a normally open contact 2 and a normally closed contact 2. The normally open contact 1 and the normally open contact 2 are connected in series. The other end of the normally open contact 1 is connected to the power supply. The other end of the normally open contact 2 is connected to the coil of the holding relay 3. The normally closed contact 1 and the normally closed contact 2 are connected in series. The other end of the normally closed contact 1 is connected to the power supply. The other end of the normally closed contact 2 is connected to the coil of the releasing relay 4;

[0023] The normally open contact of the holding relay 3 is connected to one coil of the electromagnetic directional control valve 5, and the releasing relay 4 is connected to the other coil of the electromagnetic directional control valve 5;

[0024] The electromagnetic directional control valve 5 is connected to the power supply through the normally open contact of the holding relay 3 or the normally open contact of the releasing relay 4.

[0025] Preferably, both the first switch 1 and the second switch 2 include two-position self-locking rotary switches. The normally open contact 1 and the normally closed contact 1 of the first switch 1 are interlocked, and the normally open contact 2 and the normally closed contact 2 of the second switch 2 are interlocked.

[0026] Preferably, the electromagnetic directional control valve 5 includes a two-position three-way solenoid valve.

[0027] Preferably, the shaft holding device 6 is connected to a hydraulic pipeline through the two-position three-way solenoid valve. The shaft holding device 6 is a hydraulic shaft holding device.

[0028] Preferably, both the first switch 1 and the second switch 2 are provided with operation panels. The operation panel includes a bracket 7, a wiring panel 9 and a protective cover 8;

[0029] The bracket 7 is an inverted T-shaped mechanism. A protective cover 8 is provided at the upper end of the bracket 7. The protective cover 8 is fixed to the bracket 7 by bolts. A wiring panel 9 is provided inside the protective cover 8. The wiring panel 9 is fixed to the protective cover 8. The first switch 1 or the second switch 2 is provided on the wiring panel 9.

[0030] The brackets are separately arranged on the driving side and the operating side, and the protective cover 8 is opened during operation.

[0031] As Figure 1 shown. When the rolling mill is working, no one operates the first switch 1 and the second switch 2. The power supply is connected to the release relay 4 through the normally closed contacts 1 and 2, and the circuit is energized. After the coil of the release relay 4 is energized, the normally open contact closes. Since the normally open contact 1 and the normally closed contact 1 are interlocked, and the normally open contact 2 and the normally closed contact 2 are interlocked, the normally open contact 1 and the normally open contact 2 are disconnected at this time. Then, the coil B of the electromagnetic directional valve 5 is energized, the valve port of the electromagnetic directional valve 5 is opened, the b side of the shaft holding device 6 is connected to the hydraulic pipeline, and the shaft holding device 6 is in the released state.

[0032] As Figure 1 shown. When it is necessary to hold the shaft tightly by the shaft holding device 6, two workers press the first switch 1 and the second switch 2 respectively. At this time, the power supply is connected to the holding relay 3 through the normally open contacts 1 and 2, and the coil of the alarm relay 3 is energized, and the normally open contact closes. At the same time, since the normally open contact 1 and the normally closed contact 1 are interlocked, and the normally open contact 2 and the normally closed contact 2 are interlocked, the normally closed contact 1 and the normally closed contact 2 are in the disconnected state at this time. Then, the A coil of the electromagnetic directional valve 5 is energized, the valve port of the electromagnetic directional valve 5 is opened, the a side of the shaft holding device 6 is connected to the hydraulic pipeline, and the shaft holding device 6 is in the holding state.

[0033] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention patent should be included within the scope of the patent application of the present invention.

Claims

1. A control circuit for an anti-misoperation shaft-holding device of a rolling mill, comprising a switch, a relay, an electromagnetic directional valve (5) and a shaft-holding device (6), characterized in that, The switch includes a first switch (1) and a second switch (2), the relay includes a clamping relay (3) and a releasing relay (4), the first switch (1) includes a normally open contact 1 and a normally closed contact 1, the second switch (2) includes a normally open contact 2 and a normally closed contact 2, the normally open contact 1 and the normally open contact 2 are connected in series, the other end of the normally open contact 1 is connected to the power supply, the other end of the normally open contact 2 is connected to the coil of the clamping relay (3), the normally closed contact 1 and the normally closed contact 2 are connected in series, the other end of the normally closed contact 1 is connected to the power supply, and the other end of the normally closed contact 2 is connected to the coil of the releasing relay (4); The normally open contact of the clamping relay (3) is connected to one coil of the electromagnetic directional valve (5), and the releasing relay (4) is connected to the other coil of the electromagnetic directional valve (5); The electromagnetic directional valve (5) is connected to the power supply through the normally open contact of the clamping relay (3) or the normally open contact of the releasing relay (4); Both the first switch (1) and the second switch (2) include two-position self-locking rotary switches, the normally open contact 1 and the normally closed contact 1 of the first switch (1) are interlocked, and the normally open contact 2 and the normally closed contact 2 of the second switch (2) are interlocked; Both the first switch (1) and the second switch (2) are provided with operation panels, and the operation panels include a bracket (7), a wiring panel (9) and a protective cover (8).

2. The anti-misoperation mill shaft hugging device control circuit according to claim 1, characterized in that The electromagnetic directional valve (5) includes a two-position three-way electromagnetic valve.

3. The anti-misoperation mill shaft hugging device control circuit according to claim 2, characterized in that, The shaft clamp (6) is connected to a hydraulic pipeline through the two-position three-way electromagnetic valve.

4. The control circuit of the shaft clamp of the anti-misoperation rolling mill according to claim 1, characterized in that The bracket (7) is an inverted T-shaped mechanism, a protective cover (8) is arranged at the upper end of the bracket (7), the protective cover (8) is fixed to the bracket (7) by bolts, a wiring panel (9) is arranged inside the protective cover (8), the wiring panel (9) is fixed to the protective cover (8), and the first switch (1) or the second switch (2) is arranged on the wiring panel (9).

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