Crane mechanism encoder fault emergency protection circuit and device

Abstract

The utility model provides a crane mechanism encoder fault emergency protection circuit and device, and relates to the technical field of crane emergency protection. The circuit comprises a circuit breaker, a direct-current power supply and intermediate relays K1, K2 and K3. And the circuit breaker is connected with crane control alternating current. And the direct-current power supply is connected with the circuit breaker. The lower end of a normally open contact of the intermediate relay K1 is connected with an encoder of the lifting motor M1, and the upper end of the normally open contact of the intermediate relay K1 is connected with a frequency converter communication card of the lifting motor M1 and the upper end of a normally open contact of the intermediate relay K3. The lower end of a normally open contact of the intermediate relay K2 is connected with an encoder of the lifting motor M2, and the upper end of the normally open contact of the intermediate relay K2 is connected with a frequency converter communication card of the lifting motor M2 and the lower end of a normally open contact of the intermediate relay K3. The technical scheme can be realized under the condition that the layout and the structure of an original port crane control system are not changed, control is carried out through a hard loop, and the original program of equipment does not need to be changed.

Description

Technical Field

[0001] The utility model relates to the technical field of crane emergency protection, in particular to a crane mechanism encoder fault emergency protection circuit and device. Background Art

[0002] Port cranes play a vital role in port loading and unloading operations. Their reliability is of great significance in cargo loading and unloading, heavy cargo handling, terminal production efficiency and operation safety. Encoder failure will have a series of negative effects on the crane operation mechanism. When the encoder of the coaxial mechanism in the port crane (such as the hoisting mechanism of the quay crane) fails, this device can be used as an emergency device to ensure the normal operation of the mechanism, ensure the normal production of the terminal, maintain the flow of goods, and ensure the sustainable development of the port.

[0003] In the crane operating mechanism that requires closed-loop control, the encoder is one of the essential components. During the operation of the mechanism, the encoder can monitor the operating speed and other information of the crane operating mechanism in real time, and feed the speed information back to the control system. Each crane operating mechanism will correspond to an encoder so that the control system can adjust the speed so that the crane can operate safely and reliably to meet the operation requirements.

[0004] The existing technical solutions have the following problems:

[0005] When an encoder fails, its corresponding operating mechanism will not be able to operate normally and the equipment will stop running. If you want to resume operation, you need to repair or replace the original encoder. The relevant encoder may have problems such as long procurement cycle and difficult installation, which will delay the original construction period and affect production efficiency.

[0006] Therefore, the purpose of the present invention is to develop an encoder failure emergency electric control system device. When the encoder fails, it can respond directly and quickly for emergency use, ensuring the normal operation of the crane and reducing the impact of repairing or replacing the encoder on the dock production operation. Utility Model Content

[0007] Purpose of the utility model: to propose an emergency protection circuit for a crane mechanism encoder failure, and to propose a device based on the emergency protection circuit, so as to solve the above-mentioned problems existing in the prior art.

[0008] In a first aspect, the utility model provides a crane mechanism encoder fault emergency protection circuit, which includes a circuit breaker Q1, a DC power supply T1, an intermediate relay K1, an intermediate relay K2, and an intermediate relay K3.

[0009] Circuit breaker Q1 is connected to the crane control AC power.

[0010] The DC power supply T1 is connected to the circuit breaker Q1 to convert the 220V AC power supply into a 24V DC power supply.

[0011] The lower end of the normally open contact of the intermediate relay K1 is connected to the encoder of the lifting motor M1, and the upper end is connected to the inverter communication card of the lifting motor M1 and the upper end of the normally open contact of the intermediate relay K3. The lower end of the normally open contact of the intermediate relay K2 is connected to the encoder of the lifting motor M2, and the upper end is connected to the inverter communication card of the lifting motor M2 and the lower end of the normally open contact of the intermediate relay K3.

[0012] In a further embodiment of the first aspect, the crane mechanism encoder fault emergency protection circuit also includes a three-speed conversion switch, which can switch between three gears when the three-speed conversion switch is turned, thereby correspondingly switching three modes, and the hard circuit of each mode is connected to the coils of two intermediate relays.

[0013] The three modes corresponding to the three gears are as follows:

[0014] The first gear corresponds to the normal mode, at which time the intermediate relays K1 and K2 are energized at the same time, and the intermediate relay K3 is de-energized;

[0015] The second gear position corresponds to the M1 fault emergency mode. At this time, the intermediate relays K2 and K3 are energized at the same time, and the intermediate relay K1 is de-energized;

[0016] The third gear corresponds to the M2 fault emergency mode. At this time, the intermediate relay K1 and the intermediate relay K3 are energized at the same time, and the intermediate relay K2 loses power.

[0017] As a second aspect of the utility model, a crane mechanism encoder fault emergency protection device is proposed, which includes a box body, a terminal block, a circuit breaker Q1, a DC power supply T1, an intermediate relay K1, an intermediate relay K2, an intermediate relay K3, an outer door of the box, a cable network cable inlet, a cable network cable outlet, and a touch screen.

[0018] The terminal block is fixed inside the box. The circuit breaker Q1, the DC power supply T1, the intermediate relay K1, the intermediate relay K2, and the intermediate relay K3 are connected to form the crane mechanism encoder fault emergency protection circuit disclosed in the first aspect and its further embodiments and are arranged in the box.

[0019] The outer door of the box is arranged on the box body and can be opened or closed.

[0020] The cable and network cable inlet and the cable and network cable outlet are fixed at the lower part of the box body and are communicated with the interior of the box body.

[0021] The touch screen is connected to the PLC unit of the crane mechanism through a network cable, and reads and displays the relevant data of the crane mechanism encoder.

[0022] Beneficial effects: The utility model proposes a crane mechanism encoder fault emergency protection circuit and device, which can be realized without changing the original port crane control system layout and structure, and is controlled by a hard loop, without changing the original program of the equipment. The emergency box is small in size and simple to install and upgrade. After installation, if an encoder failure occurs, it only needs to be switched to the corresponding fault condition through the conversion switch, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the external structure of the crane mechanism encoder failure emergency protection device in the embodiment of the utility model.

[0024] Figure 2 It is a schematic diagram of the internal structure of the crane mechanism encoder failure emergency protection device in the embodiment of the utility model.

[0025] Figure 3 It is a wiring schematic diagram of the crane mechanism encoder fault emergency protection circuit in the embodiment of the utility model.

[0026] The reference numerals in the figure are as follows: box 1, cable inlet and outlet 2, touch screen 3, three-speed conversion switch 4, intermediate relay 5, DC power supply 6, circuit breaker 7, terminal block 8. DETAILED DESCRIPTION

[0027] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0028] See Figure 1 and Figure 2 As shown, an embodiment of the utility model discloses an emergency protection device for a crane mechanism encoder fault. The technical solution consists of a box 1, a cable network cable inlet and outlet 2, an HMI touch screen 3, a three-speed conversion switch 4, an intermediate relay 5, a 24V DC power supply 6, a circuit breaker 7 and a terminal block 8.

[0029] The fault emergency box consists of two parts, the outer part and the inner part. The outer door of the box is embedded with an HMI touch screen 3 and a three-speed conversion switch 4, wherein the touch screen 3 is connected to the CPU of the local PLC via Ethernet communication, and can read and display the encoder-related data and status; and the three-speed conversion switch 4 can select the corresponding function according to different situations (normal\M1 motor encoder fault\M2 motor encoder fault). The terminal block 8 is fixed inside the box body 1. The outer door of the box is set on the box body 1 and can be opened or closed. The cable network cable inlet and outlet 2 are fixed to the lower part of the box body 1 and are connected to the inside of the box body 1. The circuit breaker 7, the DC power supply 6, and the intermediate relay 5 are connected to form a crane mechanism encoder fault emergency protection circuit and are set in the box body 1.

[0030] The specific connection diagram of the crane mechanism encoder fault emergency protection circuit is as follows Figure 3 The electrical components used are shown in the following table.

[0031] Serial number Code name Models and specifications quantity 1 SB1 Three-speed switch K2C-003NCHC 1 2 HMI touchscreen KTP900 1 3 T1 DC Power Supply LRS-350-24 1 4 K1~K3 Intermediate relay CAD-50BDC 3 5 Q1 breaker C65N-D20A / 2P 1

[0032] The crane mechanism encoder fault emergency protection circuit is directly connected to the crane's 220V control AC power, and through the air switch circuit breaker Q1 with a rated current of 20A, the DC power supply T1 converts AC220V into DC24V to power the internal system of the box. The lower end of the normally open contact of the intermediate relay K1 is connected to the encoder of the lifting motor M1, and the upper end is connected to the upper end of the normally open contact of the lifting motor M1 inverter communication card and the intermediate relay K3; the lower end of the normally open contact of the intermediate relay K2 is connected to the encoder of the lifting motor M2, and the upper end is connected to the lower end of the normally open contact of the lifting motor M2 inverter communication card and the intermediate relay K3. The hard circuit of each selection mode (normal\M1 fault emergency\M2 fault emergency) of the three-speed conversion switch is connected to the coils of two of the intermediate relays. The touch screen will be connected to the CPU module of the local PLC through Ethernet, read the encoder related data (such as pulse, speed, fault condition, etc.) and display it on the touch screen.

[0033] When the encoders of the two coaxial motors are normal, SB1 selects "Normal". At this time, the intermediate relays K1 and K2 are energized at the same time, and the intermediate relay K3 is de-energized. The communication cards of the two motor inverters can read normal data to ensure that the inverter performs closed-loop control on the motors; when the encoder of the lifting motor M1 fails and the encoder of the lifting motor M2 is normal, SB1 selects "M1 Fault Emergency". At this time, the intermediate relays K2 and K3 are energized at the same time, and the intermediate relay K1 is de-energized. The communication card of the lifting motor M1 inverter will communicate with the encoder of the lifting motor M2. Since it is a coaxial mechanism, the data fed back by the encoder of the lifting motor M2 is similar to that of the lifting motor M1 in a short time, and can be used as a closed-loop control of the lifting motor M1 in an emergency, ensuring smooth operation on site and buying time for repairing or replacing the encoder of the lifting motor M1; similarly, when the encoder of the lifting motor M2 fails, SB1 can select "M2 Fault Emergency".

[0034] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the present invention defined in the appended claims.

Claims

1. A crane mechanism encoder fault emergency protection circuit, characterized in that: include: Circuit breaker Q1, connected to the crane control AC power; A DC power supply T1 is connected to the circuit breaker Q1 to convert the 220V AC power supply into a 24V DC power supply; Intermediate relay K1, intermediate relay K2, intermediate relay K3; the lower end of the normally open contact of the intermediate relay K1 is connected to the encoder of the lifting motor M1, and the upper end is connected to the inverter communication card of the lifting motor M1 and the upper end of the normally open contact of the intermediate relay K3; The lower end of the normally open contact of the intermediate relay K2 is connected to the encoder of the lifting motor M2, and the upper end is connected to the inverter communication card of the lifting motor M2 and the lower end of the normally open contact of the intermediate relay K3.

2. The crane mechanism encoder fault emergency protection circuit according to claim 1, characterized in that: It also includes a three-speed conversion switch, which can be switched among three gears when the three-speed conversion switch is turned, thereby correspondingly switching three modes, and the hard circuit of each mode is connected to the coils of two intermediate relays.

3. The crane mechanism encoder fault emergency protection circuit according to claim 2, characterized in that: The three modes corresponding to the three gears are as follows: The first gear corresponds to the normal mode, at which time the intermediate relays K1 and K2 are energized at the same time, and the intermediate relay K3 is de-energized; The second gear position corresponds to the M1 fault emergency mode. At this time, the intermediate relays K2 and K3 are energized at the same time, and the intermediate relay K1 is de-energized; The third gear corresponds to the M2 fault emergency mode. At this time, the intermediate relay K1 and the intermediate relay K3 are energized at the same time, and the intermediate relay K2 loses power.

4. A crane mechanism encoder fault emergency protection device, characterized in that: include: Box; A terminal block is fixed inside the box; The crane mechanism encoder fault emergency protection circuit according to any one of claims 1 to 3 is arranged in the box and provides wiring through the terminal block; The outer door of the box is arranged on the box body and can be opened or closed.

5. The crane mechanism encoder fault emergency protection device according to claim 4, characterized in that: It also includes a cable and network cable inlet and a cable and network cable outlet which are fixed at the lower part of the box and communicated with the interior of the box.

6. The crane mechanism encoder fault emergency protection device according to claim 4, characterized in that: It also includes a touch screen installed on the outer door of the box; the touch screen is connected to the PLC unit of the crane mechanism through a network cable, reads relevant data of the crane mechanism encoder and displays it.

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