Translation furnace door safety control system based on PLC

Abstract

The utility model discloses a translation furnace door safety control system based on a PLC, and belongs to the field of vacuum equipment. The technical problems that when the furnace door is closed, the furnace door structure possibly deforms, and a longitudinal motor of the furnace door is damaged are solved. According to the technical scheme, the device comprises a furnace door motor, the furnace door motor is connected to a contactor control module of a PLC, an air cylinder control module of the PLC is electrically connected with a furnace door in-place closing module I of the PLC, a vacuum extraction control module and an air cylinder control switch of the PLC, and the furnace door in-place closing module I is further electrically connected with a travel switch. The vacuum extraction control module is further electrically connected with a vacuumizing device, the PLC further comprises a band-type brake control module, the band-type brake control module is electrically connected with a vacuum air pressure monitoring module of the PLC, a furnace door in-place closing module II of the PLC and a band-type brake control switch, and the vacuum air pressure monitoring module is further electrically connected with a vacuum pressure detector. The furnace door in-place closing module I is electrically connected with the band-type brake control module; the utility model is applied to the high-temperature purification furnace.

Description

TECHNICAL FIELD

[0001] The utility model provides a kind of translation furnace door safety control system based on PLC, belong to vacuum equipment technical field. BACKGROUND

[0002] Translation furnace door is mainly applied to large horizontal purification furnace, compared with hinged furnace door, it can effectively save site space, in actual use process, when translation furnace door is closed, since the inside of furnace body and the outside of furnace body are atmospheric pressure, furnace door and furnace body are usually not completely adhered, and there is a gap, usually in the inside of furnace body, air is extracted, so that the pressure in the furnace is lower than atmospheric pressure, and then furnace door and furnace body can be completely adhered, Chinese utility model patent (CN 211043999 U) proposes to realize the opening and closing of furnace cover by the cooperation of PLC controller and limit proximity switch, but in actual operation process, there may be excessive adhesion between furnace door and furnace body, at this time, furnace door will produce certain longitudinal displacement, which will cause deformation of furnace door structure and damage to furnace door longitudinal motor. CONTENT OF UTILITY MODEL

[0003] The utility model discloses a kind of translation furnace door safety control systems based on PLC, to solve the technical problem that furnace door structure may be deformed and furnace door longitudinal motor is damaged when closing furnace door, and the purpose is to avoid deformation of furnace door structure and damage to furnace door longitudinal motor when closing furnace door by improving the hardware structure and / or circuit structure of furnace door control system.

[0004] To solve the above technical problems, the utility model adopts the technical scheme that a kind of translation furnace door safety control system based on PLC, including furnace door motor, the output end of the furnace door motor is connected to furnace door, the input end of the furnace door motor is electrically connected frequency converter and then accesses the output end of furnace door motor contactor, the input end of the furnace door motor contactor accesses power supply;

[0005] The furnace door motor contactor is also electrically connected with the contactor control module of PLC controller;

[0006] The cylinder control module of PLC controller is electrically connected with furnace door closing to position module one of PLC controller, vacuum extraction control module of PLC controller and cylinder control switch, the furnace door closing to position module one is also electrically connected with travel switch, the vacuum extraction control module is also electrically connected with vacuumizing device;

[0007] The PLC controller also includes brake control module, the brake control module is electrically connected with vacuum air pressure monitoring module of PLC controller, furnace door closing to position module two of PLC controller and brake control switch, the vacuum air pressure monitoring module is also electrically connected with vacuum pressure detector;

[0008] The furnace door closing module 1 is electrically connected to the brake control module;

[0009] The PLC controller is electrically connected to a host computer.

[0010] Furthermore, the travel switch is a normally closed switch.

[0011] Furthermore, the furnace door motor includes two transverse furnace door motors and one longitudinal furnace door motor.

[0012] Furthermore, the furnace door motor adopts a triangle connection method.

[0013] Furthermore, the vacuum pressure detector is a vacuum gauge.

[0014] Furthermore, the PLC controller is connected to the host computer via a network cable.

[0015] Furthermore, the furnace door motor and the furnace door brake motor are powered separately.

[0016] Furthermore, the frequency converter includes a furnace door motor parameter module, a startup control module, an alarm value module and a fault signal module.

[0017] Furthermore, the power supply of the limit switch is a 24V DC power supply.

[0018] Furthermore, the power supply module of the PLC controller is connected to a 24V DC power supply.

[0019] The beneficial effects of the present invention compared to the prior art are:

[0020] The travel switch and inductive limit switch of the utility model monitor the position status of the furnace door in real time, and the vacuum air pressure status in the furnace is monitored in real time through the vacuum air pressure monitoring module of the PLC controller, thereby realizing dynamic adjustment of the sliding furnace door system, improving the flexibility and efficiency of furnace door closing, effectively preventing deformation of the furnace door structure and damage to the longitudinal motor of the furnace door, greatly reducing equipment operation and maintenance costs, and being economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 The working principle of this utility model Figure One ;

[0024] Figure 3 The working principle of this utility model Figure Two ;

[0025] In the figure: 1 is the horizontal furnace door motor, 2 is the furnace door, 3 is the cylinder, and 4 is the longitudinal furnace door motor. DETAILED DESCRIPTION

[0026] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0027] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this invention based on specific circumstances.

[0028] like Figures 1 to 3 As shown, the utility model provides a PLC-based sliding furnace door safety control system, including a furnace door motor, the output end of the furnace door motor is connected to the furnace door 2 to control the movement of the furnace door 2, the input end of the furnace door motor is electrically connected to the frequency converter and then connected to the output end of the furnace door motor contactor, and the input end of the furnace door motor contactor is connected to a power supply. Specifically, the furnace door motor includes two horizontal furnace door motors 1 and one vertical furnace door motor 4, and the two horizontal furnace door motors 1 and the vertical furnace door motor 4 jointly control the opening and closing of the furnace door 2. The two horizontal furnace door motors 1 are respectively connected in series with a first frequency converter and then connected in parallel to the output end of the furnace door motor contactor, and the input end of the furnace door motor contactor is connected to a 380V three-phase AC power supply; the vertical furnace door motor 4 is connected in series with a second frequency converter and then connected to a 380V three-phase AC power supply. The connection method of the two horizontal furnace door motors 1 and the vertical furnace door motor 4 is both triangle connection.

[0029] The frequency converter includes a furnace door motor parameter module, a start control module, an alarm value module and a fault signal module. Users can check the parameters of the furnace door motor and select the method to start the furnace door motor.

[0030] The furnace door motor contactor is also electrically connected to the contactor control module of the PLC controller, and the contactor control module of the PLC controller controls the engagement of the furnace door motor contactor. The cylinder control module of the PLC controller is electrically connected to one end of the cylinder control switch, the furnace door fully closed module 1 of the PLC controller, and the vacuum extraction control module of the PLC controller. The other end of the cylinder control switch is electrically connected to cylinder 3. In this embodiment, the cylinder control switch is a relay. The furnace door fully closed module 1 is also electrically connected to a travel switch, which is a normally closed switch. The travel switch is mounted on furnace door 2 and detects a first furnace door fully closed signal and transmits the first furnace door fully closed signal to the cylinder control module. The vacuum extraction control module is also electrically connected to a vacuum extraction device. The PLC controller also includes a brake control module, which is electrically connected to the vacuum pressure monitoring module of the PLC controller, the furnace door fully closed module 2 of the PLC controller, and the brake control switch. The furnace door fully closed module 1 is electrically connected to the brake control module. In this embodiment, the brake control switch is a relay. The vacuum pressure monitoring module is also electrically connected to a vacuum pressure detector, a vacuum gauge located within the purification furnace, to monitor the pressure within the furnace. The second furnace door closure module is also electrically connected to an inductive limit switch that detects the second furnace door closure signal and outputs it to the brake control module. A PLC controller is also electrically connected to the host computer.

[0031] Specifically, the furnace door closing to position module one is electrically connected with the travel switch on the furnace door 2 through a cable, the state of the travel switch is monitored, the travel switch action indicates that the furnace door 2 moves to the preset position, when the furnace door closing to position module one monitors the travel switch action, the corresponding pin of the furnace door closing to position module one of the PLC controller changes from a high level state to a low level state, the travel switch action signal is transmitted to the cylinder control module of the PLC controller, the cylinder control module controls the cylinder relay to act, and then controls the cylinder 3 on the furnace door 2 to close, stops moving the furnace door 2, the cylinder closing signal is fed back to the cylinder control module, after the furnace door closing to position module one receives the cylinder closing signal, the first furnace door closing to position signal is transmitted to the brake control module, after the brake control module receives the first furnace door closing to position signal transmitted by the furnace door closing to position module one, the brake control module controls the furnace door brake motor to keep the open state. After the cylinder control module monitors the cylinder closing signal, the cylinder closing signal is transmitted to the vacuum extraction control module of the PLC controller, the vacuum extraction control module is electrically connected with the vacuum extraction device, the vacuum extraction device performs vacuum extraction, the furnace door 2 occurs relative displacement, and the furnace door 2 is further attached to the furnace body. The vacuum pressure detection module in the furnace monitors the vacuum pressure state in the furnace in real time, when the vacuum pressure value in the furnace is less than or equal to the preset air pressure value in the vacuum pressure monitoring module and the second furnace door closing to position signal is monitored by the furnace door closing to position module two of the PLC controller, the brake control module of the PLC controller is triggered, and the brake control module of the PLC controller controls the brake relay to close the furnace door brake motor.

[0032] The furnace door motor and the furnace door brake motor are separately powered, and the parallel connection method is not used.

[0033] In the embodiment, the preset air pressure value in the vacuum pressure monitoring module is less than or equal to standard atmospheric pressure-20kPa

[0034] The working principle of the utility model is as follows:

[0035] When closing furnace door 2, the upper computer outputs an action signal to the contactor control module of the PLC controller. The contactor control module controls the furnace door motor contactor to be energized, and then controls the operation of the furnace door motor. The furnace door motor drives furnace door 2 to move. When furnace door 2 moves to the preset position and triggers the travel switch, the furnace door closed position module transmits the first furnace door closed position signal detected to the cylinder control module. The cylinder control module controls the cylinder control switch to operate and close cylinder 3. After the cylinder control module transmits the cylinder closing signal to the furnace door closing module 1, the furnace door closing module 1 transmits the first furnace door closing signal to the brake control module, and the brake control module controls the furnace door brake motor to keep it in the open state. At the same time, the cylinder control module transmits the cylinder closing signal to the vacuum extraction control module of the PLC controller, and the vacuum extraction control module controls the vacuum extraction device to perform vacuum extraction, and the furnace door 2 undergoes relative displacement. When the vacuum pressure value in the furnace monitored by the vacuum air pressure detection module is less than or equal to the preset air pressure value in the vacuum air pressure monitoring module and the furnace door closing module 2 of the PLC controller monitors the second furnace door closing signal, the brake control module of the PLC controller is triggered, and the brake control module controls the brake control switch to operate, and the furnace door brake motor is closed.

[0036] Regarding the specific structure of the present invention, it should be noted that the connection relationship between the various component modules adopted in the present invention is definite and feasible. Except for the special instructions in the embodiments, the specific connection relationship can bring about corresponding technical effects and solve the technical problems raised by the present invention without relying on the execution of the corresponding software program. The components, modules, models of specific components appearing in the present invention, the connection methods between each other, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, except for the specific instructions, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technology and common knowledge in this field, and there is no need to elaborate, so that the technical solution provided in this case is clear, complete, and feasible, and the corresponding physical products can be reproduced or obtained based on this technical means.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A PLC-based sliding furnace door safety control system, characterized by: It comprises a furnace door motor, the output end of the furnace door motor is connected to the furnace door (2), the input end of the furnace door motor is electrically connected to the frequency converter and then connected to the output end of the furnace door motor contactor, and the input end of the furnace door motor contactor is connected to the power supply; The furnace door motor contactor is also electrically connected to a contactor control module of a PLC controller; The cylinder control module of the PLC controller is electrically connected to the furnace door closing module 1 of the PLC controller, the vacuum extraction control module of the PLC controller and the cylinder control switch, the furnace door closing module 1 is also electrically connected to the travel switch, and the vacuum extraction control module is also electrically connected to the vacuum extraction device; The PLC controller also includes a brake control module, which is electrically connected to a vacuum pressure monitoring module of the PLC controller, a furnace door closing module 2 of the PLC controller, and a brake control switch, and the vacuum pressure monitoring module is also electrically connected to a vacuum pressure detector; The furnace door closing module 1 is electrically connected to the brake control module; The PLC controller is electrically connected to a host computer.

2. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The travel switch is a normally closed switch.

3. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The furnace door motor comprises two transverse furnace door motors (1) and one longitudinal furnace door motor (4).

4. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The furnace door motor adopts a triangle connection method.

5. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The vacuum pressure detector is a vacuum gauge.

6. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The PLC controller is connected to the host computer via a network cable.

7. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The furnace door motor and the furnace door brake motor are powered separately.

8. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The frequency converter includes a furnace door motor parameter module, a start control module, an alarm value module and a fault signal module.

9. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The power supply of the travel switch is a 24V DC power supply.

10. The PLC-based sliding furnace door safety control system according to claim 1, characterized in that: The power module of the PLC controller is connected to a 24V DC power supply.

Images