Electrical control system of screw conveyer

Abstract

The utility model provides an electrical control system of a screw conveyer, which is characterized in that a rotary feeder is replaced by the screw conveyer, and the screw conveyer is locally or remotely controlled by the electrical control system which comprises a three-stage relay combination of a remote / local conversion, a forward / reverse rotation relay and a forward / reverse rotation contactor; the control mode is flexible and sensitive, and the function of automatically switching the forward running state and the reverse running state of the feeding system is achieved. According to the utility model, the occurrence of shutdown caused by material blocking in the use process is reduced, the accident probability is reduced, and the operation efficiency of the system is improved. The blanking hopper is convenient to clean when the blanking hopper is caked and blocked, and is good in maintainability.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical control of screw conveyors, and particularly relates to an electrical control system for screw conveyors. Background Art

[0002] The existing feeding system of mills is a rotary feeder, which often jams during operation, resulting in shutdowns. On the other hand, due to the high water content of slag, the feeding hopper often clogs and blocks, requiring shutdowns for cleaning, which affects the operating efficiency of the system and increases the probability of safety accidents. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an electrical control system for a screw conveyor, which is used to automatically switch the normal rotation operation state and reverse rotation operation state of the feeding system.

[0004] The technical solution adopted by the utility model to solve the above technical problem is: an electrical control system for a screw conveyor, including a total control circuit connected in parallel to one phase of the three-phase main power supply circuit of the screw conveyor and a signal circuit of the central control platform; the total control circuit includes a control mode circuit and a control direction circuit connected in series; the control mode circuit includes a remote control circuit and a local control circuit connected in parallel; the local control circuit is a manual on-off circuit; the remote control circuit is a circuit that is turned on and off according to the state of the signal circuit of the central control platform; the control direction circuit includes a forward rotation circuit and a reverse rotation circuit connected in parallel; the forward rotation circuit is used to control the forward rotation operation of the screw conveyor; the reverse rotation circuit is used to control the reverse rotation operation of the screw conveyor.

[0005] According to the above scheme, the control mode circuit adopts a remote / local transfer switch S4; the remote / local transfer switch S4 is a single-pole double-throw switch, the moving end is connected in series in the total control circuit, and the stationary ends are respectively connected in series in the remote control circuit and the local control circuit, and are used to switch the remote control state and local control state of the control system.

[0006] According to the above scheme, the remote control circuit includes a forward rotation relay KA2 and a reverse rotation relay KA3; the local control circuit includes a forward rotation start button S1 and a reverse rotation start button S2; the forward rotation circuit includes a forward rotation start button S1, a forward rotation relay KA2, and a forward rotation contactor KM1; the reverse rotation circuit includes a reverse rotation start button S2, a reverse rotation relay KA3, and a reverse rotation contactor KM2.

[0007] Furthermore, the coil of the forward rotation relay KA2 is connected in series in the forward rotation drive signal circuit of the central control platform, and the normally open auxiliary contact is connected in series in the remote control circuit and the forward rotation circuit; the coil of the reverse rotation relay KA3 is connected in series in the reverse rotation drive signal circuit of the central control platform, and the normally open auxiliary contact is connected in series in the remote control circuit and the reverse rotation circuit.

[0008] Further, the coil of the forward rotation contactor KM1 is connected in series in the forward rotation circuit, the main contacts are connected in series in the forward rotation power supply circuit of the screw conveyor, and the normally open auxiliary contacts are connected in series in the forward rotation response signal circuit of the central control platform; the coil of the reverse rotation contactor KM2 is connected in series in the reverse rotation circuit, the main contacts are connected in series in the reverse rotation power supply circuit of the screw conveyor, and the normally open auxiliary contacts are connected in series in the reverse rotation response signal circuit of the central control platform.

[0009] According to the above solution, it further includes a protection circuit connected in series in the total control circuit, which is used to control the on / off of the total control circuit according to the current condition of the three-phase main power supply circuit of the screw conveyor.

[0010] Further, the protection circuit adopts a thermal relay KH; the coil of the thermal relay KH is connected in series in the three-phase main power supply circuit of the screw conveyor, and the contacts are connected in series in the total control circuit, which is used to disconnect the total control circuit when the power supply circuit is overloaded, and further disconnect the contacts of the forward rotation contactor KM1 and the reverse rotation contactor KM2 simultaneously.

[0011] According to the above solution, it further includes a stop button S3 connected in series in the total control circuit, which is used to control the on / off of the control circuit of the screw conveyor.

[0012] According to the above solution, it further includes signal lights, including a remote ready signal light, a forward rotation signal light, and a reverse rotation signal light, which are used to indicate that the screw conveyor has the remote start condition, the screw conveyor is running forward, and the screw conveyor is running in reverse, respectively.

[0013] Further, it also includes a ready relay KA1; the coil of the ready relay KA1 is connected in series in the remote control circuit, and the normally open auxiliary contacts are connected in series with the remote ready signal light.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. An electrical control system for a screw conveyor of the present utility model replaces the rotary feeder with a screw conveyor, and locally controls or remotely controls the screw conveyor through an electrical control system including a three-stage relay combination of remote / local conversion, forward / reverse relays, and forward / reverse contactors; the control method is flexible and sensitive, realizing the function of automatically switching the forward and reverse running states of the feeding system.

[0016] 2. The present utility model reduces the occurrence of problems such as shutdown caused by material jamming during use, reduces the accident probability, and improves the operation efficiency of the system.

[0017] 3. The present utility model is convenient for cleaning when the lower hopper is caked and blocked, and has good maintainability. Description of the Drawings

[0018] Figure 1It is the principle block diagram of the embodiment of the present utility model. Specific Embodiment

[0019] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] See Figure 1 , the embodiment of the present utility model includes a forward start button S1, a reverse start button S2, a stop button S3, a remote / local conversion switch S4, a forward contactor KM1, a reverse contactor KM2, a thermal relay KH, a ready relay KA1, a forward relay KA2, and a reverse relay KA3;

[0021] Among them, the remote / local conversion switch S4 is a single-pole double-throw switch. The moving end of the remote / local conversion switch S4 is connected in series in the total control circuit, and the stationary ends are respectively connected in series in the remote control circuit and the local control circuit, and are used to switch the remote control state and the local control state of the control system;

[0022] The forward start button S1 is connected in series with the local control circuit and the forward circuit; the reverse start button S2 is connected in series with the local control circuit and the reverse circuit;

[0023] The coil of the forward relay KA2 is connected in series in the forward drive signal circuit of the central control platform, and the normally open auxiliary contact is connected in series with the remote control circuit and the forward circuit; the coil of the reverse relay KA3 is connected in series in the reverse drive signal circuit of the central control platform, and the normally open auxiliary contact is connected in series with the remote control circuit and the reverse circuit;

[0024] The coil of the forward contactor KM1 is connected in series in the forward circuit, the main contacts are connected in series in the forward power supply circuit of the screw conveyor, and the normally open auxiliary contacts are connected in series in the forward response signal circuit of the central control platform; the coil of the reverse contactor KM2 is connected in series in the reverse circuit, the main contacts are connected in series in the reverse power supply circuit of the screw conveyor, and the normally open auxiliary contacts are connected in series in the reverse response signal circuit of the central control platform;

[0025] The coil of the ready relay KA1 is connected in series in the remote control circuit, and the normally open auxiliary contact is connected in series with the remote ready signal lamp, which is used to indicate that the screw conveyor has the condition for remote start;

[0026] The stop button S3 is connected in series in the total control circuit and is used to control the on / off of the control circuit of the screw conveyor;

[0027] The coil of the thermal relay KH is connected in series in the total power supply circuit of the screw conveyor, and the contacts are connected in series in the total control circuit. When the power supply circuit is overloaded, the total control circuit is disconnected, and at the same time, the contacts of the forward contactor KM1 and the reverse contactor KM2 are further disconnected to ensure that the screw conveyor stops and ensure the safety of the system.

[0028] In this embodiment, two control methods, on-site local control and central control remote control, are adopted to control the screw conveyor:

[0029] 1. When controlling the screw conveyor by on-site local control method, switch the remote / local transfer switch S4 to the local position;

[0030] 1.1 When forward rotation operation is required, click the forward start button S1, the forward contactor KM1 is energized and attracted, and the main contacts of the forward contactor KM1 are closed, so that the screw conveyor runs forward;

[0031] 1.2 When reverse rotation operation is required, click the reverse start button S2, the reverse contactor KM2 is energized and attracted, and the main contacts of the reverse contactor KM2 are closed, so that the screw conveyor runs in reverse.

[0032] 2. When controlling the screw conveyor by central control remote control method, switch the remote / local transfer switch S4 to the remote position, the ready relay KA1 is attracted, the normally open auxiliary contacts of the ready relay KA1 are closed, and the remote ready signal lamp lights up, indicating that the remote start condition is available;

[0033] 2.1 When forward rotation operation is required, the remote central control operator issues a forward drive signal through the central control platform, the forward relay KA2 is attracted, the normally open auxiliary contacts of the forward relay KA2 are closed, the forward contactor KM1 is energized and attracted, the main contacts of the forward contactor KM1 are closed, so that the screw conveyor runs forward. At the same time, the normally open auxiliary contacts of the forward contactor KM1 are closed, and a forward response operation signal is sent to the remote central control platform to indicate that the screw conveyor is running forward;

[0034] 2.2 When reverse rotation operation is required, the remote central control operator issues a reverse drive signal through the central control platform, the reverse relay KA3 is attracted, the normally open auxiliary contacts of the reverse relay KA3 are closed, the reverse contactor KM2 is energized and attracted, the main contacts of the reverse contactor KM2 are closed, so that the screw conveyor runs in reverse. At the same time, the normally open auxiliary contacts of the reverse contactor KM2 are closed, and a reverse response operation signal is sent to the remote central control platform to indicate that the screw conveyor is running in reverse.

[0035] The above embodiments are only used to illustrate the design concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications made according to the principles and design concepts disclosed by the present invention are within the protection scope of the present invention.

Claims

1. An electrical control system for a screw conveyor, characterized in that: It includes a total control circuit connected in parallel with one phase of the three-phase main power supply circuit of the screw conveyor and a signal circuit of the central control platform; The total control circuit includes a control mode circuit and a control direction circuit connected in series; The control mode circuit includes a remote control circuit and a local control circuit connected in parallel; the local control circuit is a manual on-off circuit; the remote control circuit is a circuit that is turned on and off according to the state of the signal circuit of the central control platform; The control direction circuit includes a forward rotation circuit and a reverse rotation circuit connected in parallel; the forward rotation circuit is used to control the forward rotation of the screw conveyor; the reverse rotation circuit is used to control the reverse rotation of the screw conveyor.

2. The electrical control system of a screw conveyor according to claim 1, wherein: The control mode circuit uses a remote / local changeover switch S4; the remote / local changeover switch S4 is a single-pole double-throw switch, the moving end is connected in series in the total control circuit, and the stationary ends are respectively connected in series in the remote control circuit and the local control circuit, and are used to switch the remote control state and the local control state of the control system.

3. The electrical control system of a screw conveyor according to claim 1, characterized in that: The remote control circuit includes a forward rotation relay KA2 and a reverse rotation relay KA3; The local control circuit includes a forward rotation start button S1 and a reverse rotation start button S2; The forward rotation circuit includes a forward rotation start button S1, a forward rotation relay KA2 and a forward rotation contactor KM1; The reverse rotation circuit includes a reverse rotation start button S2, a reverse rotation relay KA3 and a reverse rotation contactor KM2.

4. The electrical control system of a screw conveyor according to claim 3, characterized in that: The coil of the forward rotation relay KA2 is connected in series in the forward rotation drive signal circuit of the central control platform, and the normally open auxiliary contact is connected in series in the remote control circuit and the forward rotation circuit; the coil of the reverse rotation relay KA3 is connected in series in the reverse rotation drive signal circuit of the central control platform, and the normally open auxiliary contact is connected in series in the remote control circuit and the reverse rotation circuit.

5. The electrical control system of a screw conveyor according to claim 3, characterized in that: The coil of the forward rotation contactor KM1 is connected in series in the forward rotation circuit, the main contact is connected in series in the forward rotation power supply circuit of the screw conveyor, and the normally open auxiliary contact is connected in series in the forward rotation response signal circuit of the central control platform; the coil of the reverse rotation contactor KM2 is connected in series in the reverse rotation circuit, the main contact is connected in series in the reverse rotation power supply circuit of the screw conveyor, and the normally open auxiliary contact is connected in series in the reverse rotation response signal circuit of the central control platform.

6. The electrical control system of a screw conveyor according to claim 1, wherein: It also includes a protection circuit connected in series in the total control circuit, which is used to control the on-off of the total control circuit according to the current condition of the three-phase main power supply circuit of the screw conveyor.

7. The electrical control system of a screw conveyor according to claim 6, wherein: The protection circuit uses a thermal relay KH; the coil of the thermal relay KH is connected in series in the three-phase main power supply circuit of the screw conveyor, and the contact is connected in series in the total control circuit, and is used to disconnect the total control circuit when the power supply circuit is overloaded, and further disconnect the contacts of the forward rotation contactor KM1 and the reverse rotation contactor KM2 at the same time.

8. The electrical control system of a screw conveyor according to claim 1, characterized in that: It also includes a stop button S3 connected in series in the total control circuit, which is used to control the on-off of the control circuit of the screw conveyor.

9. The electrical control system of a screw conveyor according to claim 1, characterized in that: It further includes signal lights, including a remote ready signal light, a forward rotation signal light, and a reverse rotation signal light, which are respectively used to indicate that the screw conveyor has the remote start condition, the screw conveyor is running forward, and the screw conveyor is running in reverse.

10. A screw conveyor electrical control system according to claim 9, wherein: It further includes a ready relay KA1; the coil of the ready relay KA1 is connected in series in the remote control circuit, and the normally open auxiliary contact is connected in series with the remote ready signal light.

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