A container spreader electrical protection system and protection method thereof

Abstract

The present invention discloses an electrical protection system for container spreaders, including a guide plate command circuit, a guide plate motor circuit, a controller drive circuit, and a controller protection circuit. The electrical control circuit is respectively connected to the guide plate command circuit and the guide plate motor circuit, and the controller protection circuit is arranged inside the controller drive circuit. The controller drive circuit includes a relay contact switch, a contactor contact switch, a limit switch, and a master controller. The master guide plate controller is respectively connected to the relay contact switch, the contactor contact switch, and the limit switch, wherein the guide plate command circuit is connected to the relay contact switch, and the guide plate motor circuit is connected to the contactor contact switch and the limit switch. The present invention can improve the safety, stability, and economic benefits of dock operations, enable the electric guide plate to operate under a safe and reliable circuit system, increase the life of the guide plate motor, reduce the later maintenance cost, and reduce communication interference and maintenance cost.

Description

Technical Field

[0001] The present invention relates to an electrical device, and more particularly to an electrical protection system and a protection method for a container spreader. Background Art

[0002] At present, with the rapid development of international trade, port machinery and equipment are playing an increasingly important role. In the increasingly busy container grabbing operation of container spreaders, how to improve the efficiency of container grabbing is also a matter of vital interest to the port terminal. The important component for improving the container grabbing ability of the container spreader is the guide plate. The guide plate is distributed at the end or four corners of the spreader. In the spreader loading operation, it can play a guiding role, accurately guide the spreader lock head into the four corner lock holes of the container, thereby further locking the container grabbing action.

[0003] Cranes are widely used in smelting, casting, machinery manufacturing and transportation departments. They can transport steel plates, pig iron ingots, scrap steel, rails, iron ore and other objects at room temperature, which can reduce labor intensity and improve loading and unloading efficiency.

[0004] However, the working environment of electric guide plates is very bad, and impact and vibration can easily reduce their service life. The existing technology lacks a suitable electrical protection system for electric guide plates of spreaders, resulting in low safety, poor stability and poor economic benefits in terminal operations. Summary of the invention

[0005] In view of the above problems existing in the prior art, an object of the present invention is to provide an electrical protection system for a container spreader and a protection method thereof.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] On the one hand, a container spreader electrical protection system includes a guide plate command circuit, a guide plate motor circuit, a controller drive circuit, and a controller protection circuit. The electrical control circuit is respectively connected to the guide plate command circuit and the guide plate motor circuit, and the controller protection circuit is arranged inside the controller drive circuit. The controller drive circuit includes a relay contact switch, a contactor contact switch, a limit switch, and a master controller. The master guide plate controller is respectively connected to the relay contact switch, the contactor contact switch, and the limit switch, wherein the guide plate command circuit is connected to the relay contact switch, and the guide plate motor circuit is connected to the contactor contact switch and the limit switch.

[0008] Furthermore, the guide plate command circuit includes a 220VAC command signal switch and a relay. When the command signal switch is turned on, the relay is connected to 220VAC.

[0009] Furthermore, the guide plate instruction circuit includes a guide plate lower instruction circuit and a guide plate upper instruction circuit, and the guide plate lower instruction circuit and the guide plate upper instruction circuit are connected in parallel.

[0010] Furthermore, the Shuobo controller includes an upper limit interface of the guide plate and a lower limit interface of the guide plate, the upper limit interface is connected to the upper command circuit of the guide plate, and the lower limit interface is connected to the lower command circuit of the guide plate.

[0011] Furthermore, the guide plate motor circuit includes a guide plate motor, a circuit breaker, and a contactor, and the contactor is connected to a contactor contact switch of a controller driving circuit. The guide plate motor, the contactor, and the circuit breaker are connected in sequence.

[0012] On the other hand, a container spreader electrical protection method:

[0013] The controller program of the controller protection circuit is composed of input signal processing, logic operation protection, and output signal processing;

[0014] The controller protection circuit includes input command error signal elimination, guide plate action upper and lower command interlocking, and guide plate action timeout protection;

[0015] When the input command is less than 300ms, it is judged as a false signal and is filtered out. When the controller receives the command, it outputs 24V to drive the contactor to close. When the guide plate reaches the specified position, the limit sensor transmits the signal to the controller. The controller cuts off the action command after a specified delay time to prevent the guide plate from being blocked or overloaded. When the limit sensor is damaged, the guide plate action timeout protection is activated.

[0016] Furthermore, the working steps of the controller protection circuit are specifically as follows:

[0017] S1: Start detection;

[0018] S2: accept command signal input;

[0019] S3: Determine whether the instruction is greater than 300ms and there is no opposite instruction. If so, continue to S4; if not, go to S9;

[0020] S4: Determine whether there is a corresponding limit signal. If not, continue to S5; if yes, go to S9;

[0021] S5: output action;

[0022] S6: Determine whether there is a corresponding limit signal. If so, go to S8; if not, go to S7;

[0023] S7: Determine whether the output action is greater than 10s? If yes, continue to S8; if not, go to S5;

[0024] S8: stop output action;

[0025] S9: End.

[0026] In the above technical scheme, the present invention can improve the safety, stability and economic benefits of dock operations, enable the electric guide plate to operate under a safe and reliable circuit system, increase the life of the guide plate motor, reduce subsequent maintenance costs, and reduce communication interference and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the system of the present invention;

[0028] Figure 2 It is a schematic diagram of the guide plate motor circuit;

[0029] Figure 3 It is a schematic diagram of the guide plate command circuit;

[0030] Figure 4 is a schematic diagram of the controller drive circuit;

[0031] Figure 5 It is a working diagram of the controller protection circuit. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0033] Reference Figure 1 The present invention discloses an electrical protection system for container spreaders, which is used for powering, signal detection, execution and overload protection of electric guide plates of container spreaders. The main components of the electrical protection system for container spreaders of the present invention include a guide plate command circuit 1, a guide plate motor circuit 2, a controller drive circuit 3, a controller protection circuit 4, etc. In terms of connection relationship, the controller drive circuit 2 is respectively connected to the guide plate command circuit 1 and the guide plate motor circuit 2, and the controller protection circuit 4 is arranged inside the controller drive circuit 3.

[0034] like Figure 1 In the system structure shown, the guide plate command circuit 1 includes a circuit breaker, a contactor and a three-phase motor, wherein the circuit breaker can realize overload protection. The guide plate command circuit 1 includes a 220VAC command signal switch and a relay. When the command signal switch is turned on, the relay is connected to 220VAC. The guide plate command circuit 1 is used to receive the guide plate action command from the main control. The command signal is 220VAC. After receiving the command, the corresponding relay coil is energized. Figure 3 As shown, the guide plate command circuit 1 includes an upper guide plate command circuit 12 and a lower guide plate command circuit 11, and the upper guide plate command circuit 12 and the lower guide plate command circuit 11 are parallel.

[0035] Reference Figure 2 The guide plate motor circuit 2 includes a guide plate motor M, a circuit breaker 21, and a contactor 22, and the contactor is connected to the contactor contact switch of the controller driving circuit 3. The guide plate motor M, the contactor 22 and the circuit breaker 21 are connected in sequence. As a preferred embodiment of the present invention, there are two groups of contactors 22, which are connected in parallel, and each group has three contactors. There is one group of circuit breakers 21, and each group has three contactors.

[0036] like Figure 4 As shown, the controller driving circuit 3 includes a relay contact switch 31, a contactor contact switch 32, a limit switch 33, a master controller 34, etc. The master controller 34 is connected to the relay contact switch 31, the contactor contact switch 32 and the limit switch 33, respectively, wherein the guide plate instruction circuit 1 is connected to the relay contact switch 31, and the guide plate motor circuit 2 is connected to the contactor contact switch 32 and the limit switch 33. The main function of the controller driving circuit 3 is to process external instructions, output to make the contactor actuate, and receive limit sensor signals at the same time. For further reference Figure 4 The master controller 34 includes a (guide plate) upper limit interface 36 and a (guide plate) lower limit interface 35, the upper limit interface 36 is connected to the guide plate upper instruction circuit 12, and the lower limit interface 35 is connected to the guide plate lower instruction circuit 11.

[0037] The controller program of the controller protection circuit 4 is mainly composed of input signal processing, logic operation protection, and output signal processing. The controller protection circuit 4 mainly includes input command error signal elimination, guide plate action upper and lower command interlocking, guide plate action timeout protection, etc. When the input command is less than 300ms, it is judged as a false signal and filtered out. When the controller receives the command, it outputs 24V to drive the contactor to attract. When the guide plate reaches the specified position, the limit sensor transmits the signal to the controller. The controller cuts off the action command after a specified delay, so that the guide plate will not be blocked and overloaded. The guide plate action timeout protection is the last protection of the controller protection circuit 4 for the guide plate motor when the limit sensor is damaged.

[0038] Reference Figure 5 , the working steps of the controller protection circuit 4 are:

[0039] S1: Start detection.

[0040] S2: Receive command signal input.

[0041] S3: Determine whether the instruction is greater than 300ms and there is no opposite instruction. If yes, continue; if no, go to S9.

[0042] S4: Determine whether there is a corresponding limit signal? If not, continue; if yes, go to S9.

[0043] S5: Output action.

[0044] S6: Determine whether there is a corresponding limit signal? If yes, go to S8; if no, go to S7.

[0045] S7: Determine whether the output action is greater than 10s. If yes, continue; if no, go to S5.

[0046] S8: Stop output action.

[0047] S9: End.

[0048] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A container spreader electrical protection system, characterized in that: include: Guide plate command circuit, guide plate motor circuit, controller drive circuit, controller protection circuit; Wherein, the controller driving circuit is connected to the guide plate command circuit and the guide plate motor circuit respectively, and the controller protection circuit is arranged inside the controller driving circuit; The controller drive circuit includes a relay contact switch, a contactor contact switch, a limit switch, and a master controller; The master controller is respectively connected to the relay contact switch, the contactor contact switch and the limit switch, wherein the guide plate instruction circuit is connected to the relay contact switch, and the guide plate motor circuit is connected to the contactor contact switch and the limit switch.

2. The electrical protection system for container spreader according to claim 1, characterized in that: The guide plate command circuit includes a 220VAC command signal switch and a relay. When the command signal switch is turned on, the relay is connected to 220VAC.

3. The electrical protection system for container spreader according to claim 1, characterized in that: The guide plate command circuit comprises a guide plate lower command circuit and a guide plate upper command circuit, and the guide plate lower command circuit and the guide plate upper command circuit are connected in parallel.

4. The electrical protection system for container spreader according to claim 3, characterized in that: The master controller includes an upper limit interface for a guide plate and a lower limit interface for a guide plate, wherein the upper limit interface is connected to an upper instruction circuit for the guide plate, and the lower limit interface is connected to a lower instruction circuit for the guide plate.

5. The electrical protection system for container spreader according to claim 1, characterized in that: The guide plate motor circuit comprises a guide plate motor, a circuit breaker and a contactor. The contactor is connected to a contactor contact switch of a controller driving circuit. The guide plate motor, the contactor and the circuit breaker are connected in sequence.

6. A container spreader electrical protection method for the container spreader electrical protection system according to claim 5, characterized in that: The controller program of the controller protection circuit is composed of input signal processing, logic operation protection, and output signal processing; The controller protection circuit includes input command error signal elimination, guide plate action up and down command interlocking, and guide plate action timeout protection; When the input command is less than 300ms, it is judged as a false signal and filtered out. When the controller receives the command, it outputs 24V to drive the contactor to close. When the guide plate reaches the specified position, the limit sensor transmits the signal to the controller. The controller cuts off the action command after a specified delay time to prevent the guide plate from being blocked and overloaded. When the limit sensor is damaged, the guide plate action timeout protection is activated. The working steps of the controller protection circuit are specifically as follows: S1: Start detection; S2: accept command signal input; S3: Determine whether the instruction is greater than 300ms and there is no opposite instruction. If so, continue to S4; if not, go to S9; S4: Determine whether there is a corresponding limit signal. If not, continue to S5; if yes, go to S9; S5: output action; S6: Determine whether there is a corresponding limit signal. If so, go to S8; if not, go to S7; S7: Determine whether the output action is greater than 10s? If yes, continue to S8; if not, go to S5; S8: Stop output action; S9: End.

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