Skim controller

Abstract

The slag scraper control device is characterized by comprising a main circuit module and a control circuit module, the main circuit module is a three-phase power supply, comprising a power line A, B, C and a zero line N, the three-phase power supply is sequentially connected in series with a circuit breaker QF, then connected in series with an AC contactor KM main contact point, the downstream of the AC contactor KM main contact point is connected in series with a thermal relay KH, finally connected to a motor M, forming a main loop current path, a current sensor AT is connected in series between the thermal relay KH and the motor M; a control circuit is connected between the power line and the AC contactor KM and the thermal relay KH, a fuse FU is connected in front of the control circuit; under the premise of meeting normal production, by reasonably setting the current allowable value, the equipment is prevented from being damaged, the production is continuously carried out, when the slag scraper is overloaded during operation, the speed reducer is stopped in time, the chain or the speed reducer is prevented from being damaged, the production is continuously carried out, and the shutdown is prevented.

Description

Technical Field

[0001] This utility model relates to the field of circuit control technology for slag scrapers, and in particular to a control device for slag scrapers. Background Technology

[0002] In hazardous waste treatment operations, waste needs to be incinerated in a rotary kiln to treat its harmful substances at high temperatures. The remaining slag is cooled in a wet slag remover and then scraped off by a scraper. During the slag removal process, the large volume of the slag can cause chain breakage, reducer damage, and other malfunctions during the operation of the slag remover, which seriously affects production efficiency and may even lead to production stoppage. To solve the above problems, a slag remover control device is proposed. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a slag scraper control device, characterized by comprising a main circuit module and a control circuit module. The main circuit module is a three-phase power supply, including power lines A, B, C, and a neutral line N. The three-phase power supply is connected in series with a circuit breaker QF, then in series with the main contacts of an AC contactor KM. A thermal relay KH is connected in series downstream of the main contacts of the AC contactor KM, and finally connected to a motor M, forming a main circuit current path. A current sensor AT is connected in series between the thermal relay KH and the motor M. A control circuit is connected between the power lines, the AC contactor KM, and the thermal relay KH, and a fuse FU is connected before the control circuit.

[0004] The control circuit includes a local control module, a remote control module, and a protection module;

[0005] The local control module includes a start button ST1, a stop button SP1, an AC contactor KM coil, an AC contactor KM normally open contact, a time relay KT delayed normally closed contact, an intermediate relay K1, an AC contactor KM coil, and a time relay KT coil. The start button ST1 is connected in series at the beginning of the control circuit; the stop button SP1 is connected in series at the end of the control circuit; the AC contactor KM coil is connected in series in the control circuit; the AC contactor KM normally open contact and the time relay KT delayed normally closed contact are connected in series to form a self-locking circuit; the intermediate relay K1 coil is connected in parallel across the AC contactor KM coil, and its contacts achieve local logic locking; the time relay KT coil is connected in parallel in the self-locking circuit; after the timing is completed, the time relay KT delayed normally closed contact opens, releasing the self-locking; the start button ST1 is connected in series at terminals X1:3, feeding back the mechanical position of the equipment to the control unit.

[0006] The remote control module is connected to the local control module through the intermediate relay K66. The remote mode contact of the changeover switch SA is connected in parallel to the K1:4 contact to realize remote command priority control. When SA is switched to remote mode, its contact is connected in series to the remote signal input line to ensure that the local control circuit is bypassed. After the remote status signal is switched by SA, it is connected in series to the indicator light L to display the equipment operating status in real time.

[0007] The protection module includes an intermediate relay K2, which is connected in series with the AC contactor KM. After the ALC receives the over-limit signal from the current sensor AT, it triggers the intermediate relay K2 to be energized, forcing the AC contactor KM to reset and stop.

[0008] The beneficial effects of this utility model are:

[0009] Under the premise of meeting normal production, this utility model ensures that the equipment will not be damaged by reasonably setting the allowable current value, so that production can continue. When the slag scraper is running, it will stop the speed reducer in time when it is overloaded to prevent damage to the chain or speed reducer, thus ensuring continuous production and preventing production stoppage. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the slag scraper control device of this utility model. Detailed Implementation

[0011] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0012] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0013] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. Example 1

[0014] This utility model provides a slag scraper control device, characterized by including a main circuit module and a control circuit module. The main circuit module is a three-phase power supply, including power lines A, B, C and neutral line N. The three-phase power supply is connected in series to a circuit breaker QF, then in series to the main contacts of an AC contactor KM. A thermal relay KH is connected in series downstream of the main contacts of the AC contactor KM, and finally connected to a motor M to form a main circuit current path. A current sensor AT is connected in series between the thermal relay KH and the motor M. A control circuit is connected between the power lines and the AC contactor KM and the thermal relay KH. A fuse FU is connected before the control circuit.

[0015] The control circuit includes a local control module, a remote control module, and a protection module;

[0016] The local control module includes a start button ST1, a stop button SP1, an AC contactor KM coil, an AC contactor KM normally open contact, a time relay KT delayed normally closed contact, an intermediate relay K1, an AC contactor KM coil, and a time relay KT coil. The start button ST1 is connected in series at the beginning of the control circuit; the stop button SP1 is connected in series at the end of the control circuit; the AC contactor KM coil is connected in series in the control circuit; the AC contactor KM normally open contact and the time relay KT delayed normally closed contact are connected in series to form a self-locking circuit; the intermediate relay K1 coil is connected in parallel across the AC contactor KM coil, and its contacts achieve local logic locking; the time relay KT coil is connected in parallel in the self-locking circuit; after the timing is completed, the time relay KT delayed normally closed contact opens, releasing the self-locking; the start button ST1 is connected in series at terminals X1:3, feeding back the mechanical position of the equipment to the control unit.

[0017] The remote control module is connected to the local control module through the intermediate relay K66. The remote mode contact of the changeover switch SA is connected in parallel to the K1:4 contact to realize the priority control of remote commands. When SA is switched to remote mode, its contact is connected in series to the remote signal input line to ensure that the local control circuit is bypassed. After the remote status signal is switched by SA, it is connected in series to the indicator light L to display the equipment operating status in real time.

[0018] The protection module includes an intermediate relay K2, which is connected in series with the AC contactor KM. After the ALC receives the over-limit signal from the current sensor AT, it triggers the intermediate relay K2 to be energized, forcing the AC contactor KM to reset and stop. Example 2

[0019] When the selector switch SA is set to the "intermittent" position, the working principle is as follows: When the start button ST1 is pressed, the AC contactor KM on the motor M is activated, and a self-holding circuit is formed by connecting the normally open contact of the AC contactor KM in series with the time relay KT's time-delay normally closed contact. The motor M then starts working, and the time relay KT starts timing. When the set time is reached, the time relay KT's time-delay normally closed contact opens, the self-holding circuit is broken, and the motor M stops working. This achieves the logical relationship of "the motor starts after the start button is manually pressed and automatically stops after the set delay time".

[0020] When the selector switch SA is set to the "remote" position, the working principle is as follows: When the central control unit issues a command to run the scraper on the host computer, the normally open contact of the intermediate relay K66 is activated, the AC contactor KM of motor M is activated, and motor M starts to work. When the central control unit issues a command to stop the scraper on the host computer, the normally open contact of the intermediate relay K66 is deactivated, the AC contactor KM of motor M is deactivated, and motor M stops working.

[0021] When the selector switch SA is set to the "continuous" position, the working principle is as follows: the AC contactor KM of motor M is activated, and motor M starts to work. When the selector switch SA is set to other positions, the AC contactor KM is disconnected, and motor M stops working.

[0022] A current sensor AT is added to the circuit control to detect the motor current of the slag scraper. It generates a 4-20mA current signal and sends it to the PLC. The program logic determines whether to perform an interlock operation to stop the motor (based on the magnitude of the current exceeding the allowable value and the overcurrent time). When an interlock is required, the intermediate relay K2 is activated, and the corresponding normally closed contact opens, which disconnects the AC contactor KM, and the motor M stops running. If the machine stops due to an overcurrent alarm, it can only resume operation after being manually reset by the operator of the central control system, to prevent the safety hazards caused by the automatic restart of the equipment after it stops.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A slag scraper control device, characterized in that, The system includes a main circuit module and a control circuit module. The main circuit module is a three-phase power supply, including power lines A, B, and C and a neutral line N. The three phases are connected in series to a circuit breaker QF, then in series to the main contacts of an AC contactor KM. A thermal relay KH is connected in series downstream of the main contacts of the AC contactor KM, and finally connected to the motor M, forming the main circuit current path. A current sensor AT is connected in series between the thermal relay KH and the motor M. A control circuit is connected between the power lines, the AC contactor KM, and the thermal relay KH. A fuse FU is connected before the control circuit. The control circuit includes a local control module, a remote control module, and a protection module. The local control module includes a start button ST1, a stop button SP1, the coil of the AC contactor KM, and the normally closed coil of the AC contactor KM. The open contact, time relay KT time-delay normally closed contact, intermediate relay K1, AC contactor KM coil, time relay KT coil, and start button ST1 are connected in series at the front end of the control circuit; stop button SP1 is connected in series at the end of the control circuit, AC contactor KM coil is connected in series in the control circuit, AC contactor KM normally open contact and time relay KT time-delay normally closed contact are connected in series to form a self-locking circuit; intermediate relay K1 coil is connected in parallel across AC contactor KM coil, and local logic locking is achieved through its contacts; time relay KT coil is connected in parallel in the self-locking circuit. After the timing is completed, time relay KT time-delay normally closed contact opens, releasing the self-locking; start button ST1 is connected in series at terminals X1:3, feeding back the mechanical position of the equipment to the control unit.

2. The slag scraper control device according to claim 1, characterized in that, The remote control module is connected to the local control module through the intermediate relay K66. The remote mode contact of the changeover switch SA is connected in parallel to the K1:4 contact to realize remote command priority control. When SA switches to remote mode, its contact is connected in series to the remote signal input line to ensure that the local control circuit is bypassed. After the remote status signal is switched by SA, it is connected in series to the indicator light L to display the equipment operating status in real time.

3. The slag scraper control device according to claim 2, characterized in that, The protection module includes an intermediate relay K2, which is connected in series with the AC contactor KM. After the PLC receives the over-limit signal from the current sensor AT, it triggers the intermediate relay K2 to be energized, forcing the AC contactor KM to reset and stop.

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