CN220976348U - Main lifting control device of crane - Google Patents

Abstract

The utility model relates to a crane main lifting control device which comprises a first main loop, a second main loop, a third main loop, a control loop and a main command controller, wherein the second main loop is used for driving a band-type brake to act, the third main loop is used for driving a fan of a main lifting motor to operate, and the first main loop comprises a frequency converter which is used for driving the main lifting motor of a crane to operate. The utility model has the advantages that: the main controller is connected with the digital quantity input module through the port, so that the wiring is less, and the maintenance quantity is reduced; maintenance personnel inquire equipment fault information at any time through the touch screen, and the fault inquiry is visual; the speed feedback signal of the output end of the main lifting motor of the crane is fed back to the speed loop control module of the frequency converter through the pulse encoder, so that the precision of lifting action of the crane is improved; the two band-type brake brakes are adopted to act simultaneously, so that the safety of crane braking is improved, and the potential safety hazard of slipping a hook caused by single band-type brake faults is avoided.

Description

A main hoisting control device for a crane

Technical Field

The utility model relates to the technical field of cranes, in particular to a main hoisting control device for a crane.

Background technique

Bridge cranes basically use frequency converters to drive the main hoisting motor of the crane to rise and fall, which has the advantages of a large speed regulation range, small mechanical impact, and obvious energy saving. However, in actual operation, the following phenomena often occur:

The crane hook slipped, the heavy load dropped, the brake lost control, and the lifting action was not in place. Since these phenomena occurred without any regular pattern, everything was normal after the test run again;

The lifting and lowering operation of the existing crane main hoisting motor adopts a button mode, which has many buttons and many wirings;

The above problems are difficult to troubleshoot and pose safety risks.

Summary of the invention

The utility model aims to provide a main lifting control device for a crane, which improves the precision of the lifting action of the crane, makes fault inquiry intuitive, and eliminates potential safety hazards.

To achieve the above purpose, the utility model is implemented through the following technical solutions:

A main lifting control device for a crane comprises a main lifting motor of the crane, a holding brake, a main lifting motor fan, and also comprises a main circuit 1, a main circuit 2, a main circuit 3, a control circuit, and a main command controller. The main circuit 2 is used to drive the holding brake to operate, the main circuit 3 is used to drive the main lifting motor fan to operate, the main circuit 1 comprises a frequency converter, and the frequency converter is used to drive the main lifting motor of the crane to operate. The input ends of the main circuit 1, the main circuit 2, and the main circuit 3 are connected to an AC power supply 1, the control circuit comprises a digital input module and a digital output module, the digital input module and the digital output module are connected through ports, and the output contacts of the main command controller are respectively connected to the ports of the digital input module.

It also includes an encoder, which is arranged on the output shaft of the main lifting motor of the crane, and the encoder is connected to the frequency converter through a port.

The digital output module is connected to the coils of relays KA1 to KA9 through a port. The control loop also includes branches a and b connected in parallel. Branch a and branch b are both connected to AC power supply 2. Branch a includes the normally open contact of relay KA8 and the coil of contactor K31 connected in series. The coil of contactor K31 is connected in parallel with resistor R1, and capacitor C1 is connected in series with resistor R1. Branch b includes the normally open contact of relay KA9 and the coil of contactor K71 connected in series. The coil of contactor K71 is connected in parallel with resistor R2, and capacitor C2 is connected in series with resistor R2. The normally open contacts of relays KA1 to KA7 are respectively connected to the inverter through ports.

The main circuit one also includes a circuit breaker Q11 and fuses F01~F03. The power input port of the inverter is connected to fuses F01~F03 and circuit breaker Q11 in sequence, and the power output port of the inverter is connected to the main lifting motor of the crane; the main circuit two includes the normally open main contacts of the contactor K71 connected in series with the holding brake and the circuit breaker Q71; the main circuit three includes the normally open main contacts of the contactor K31 connected in series with the fan of the main lifting motor and the circuit breaker Q31.

The encoder is a pulse encoder.

The control loop also includes a CPU module, a touch screen, and a power module. The digital input module, the digital output module, the CPU module, and the power module are connected through ports. The CPU module and the touch screen are connected through a communication port. The power module is used to provide AC power II.

Compared with the prior art, the beneficial effects of the utility model are:

1. The master controller and the digital input module are connected through ports, which reduces wiring, reduces maintenance and saves production costs;

2. Maintenance personnel can query equipment fault information at any time through the touch screen. Fault query is intuitive, saving time and effort;

3. The speed feedback signal from the output end of the crane's main hoisting motor is fed back to the speed loop control module of the inverter through a pulse encoder, which improves the accuracy of the crane's hoisting action;

4. The use of two holding brakes to operate simultaneously improves the safety of crane braking. When one holding brake fails or has a hidden danger, the other holding brake can still have a braking effect, avoiding the safety hazard of hook slipping caused by a single holding brake failure.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the main circuit principle of the crane main lifting control device.

Figure 2 is a schematic diagram of the control loop principle.

FIG. 3 is a second schematic diagram of the control loop principle.

FIG. 4 is a third schematic diagram of the control loop principle.

Figure 5 is a schematic diagram of the structure of the main lifting control device of the crane.

FIG. 6 is a flow chart of the main lifting control device of the crane in the embodiment.

FIG. 7 is a schematic diagram of holding brake control in the embodiment.

In the figure: 1- reel 2- crane main lifting motor 3- brake wheel 4- reducer 5- wire rope 6- holding brake 7- hook assembly.

Detailed ways

The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[Example 1]

See Figure 5, a crane main lifting control device, the crane is a bridge crane, including a crane main lifting motor 2, a brake 6, a main lifting motor fan, a drum 1, a brake wheel 3, a reducer 4, a wire rope 5, and a hook group 7. The crane main lifting motor 2, a brake 6, a drum 1, a brake wheel 3, a reducer 4, and a main lifting motor fan are arranged on the crane beam. There are two brake brakes 6, and the two brake brakes 6 act at the same time, which improves the safety of crane braking. When one brake brake 6 fails or has a hidden danger, the other brake brake 6 can still play a braking effect, avoiding a single brake brake The failure of the reducer 6 may cause a safety hazard of hook slipping. The main lifting motor fan is used to dissipate the heat of the crane's main lifting motor 2. The crane's main lifting motor 2 is connected to the reducer 4. The crane's main lifting motor 2 drives the drum 1 to rotate. The wire rope 5 wound on the drum 1 drives the hook group 7 to rise and fall. The brake wheel 3 is installed on the input shaft of the reducer 4, and together with the reducer 4, the crane is lifted and lowered. When the holding brake 6 is stationary, it holds the brake wheel 3, and the friction between the holding brake 6 and the brake wheel 3 makes the hook stationary. When the holding brake 6 is actuated and opens, there is a gap between the holding brake 6 and the brake wheel 3 and they are not in contact, and the crane lifting mechanism is actuated.

See Figures 1 to 4. A crane main lifting control device includes a control circuit, a main command controller S40, a pulse encoder C01, a main circuit one, a main circuit two, and a main circuit three. The pulse encoder C01 is arranged on the output shaft of the crane main lifting motor 2. The pulse encoder C01 is connected to the frequency converter through ports X1 and X2. The signal collected by the pulse encoder C01 is transmitted to the frequency converter through the interface module RTAC. The speed feedback signal of the output end of the crane main lifting motor 2 is fed back to the speed loop control module of the frequency converter through the pulse encoder C01, thereby improving the accuracy of the crane lifting action.

The control circuit includes a digital input module, a digital output module, a CPU module, a touch screen, a power module, a reset button S29, and branches a and b connected in parallel. The digital input module, the digital output module, the CPU module, and the power module are connected through ports. The touch screen and the CPU module are connected through a communication port. The power module is used to provide an AC power supply of AC220V. The output contact 1, the output contact 2, the output contact 3, and the output contact 4 of the master controller S40 are respectively connected to the port 2, the port 3, the port 4, and the port 5 of the digital input module. The number of port connections of the digital input module and the digital output module is reduced, thereby reducing the amount of maintenance. The reset button S29 is connected to the port 12 of the digital input module. The master controller S40 and the reset button S29 are arranged on the operating console in the driver's cab. The digital output module Ports 2 to 10 are respectively connected to the coils of relay KA1 to KA9, and branch a and branch b are both connected to an AC power supply of AC220V. Branch a includes a normally open contact of relay KA8 and a coil of contactor K31 connected in series, the coil of contactor K31 is connected in parallel with resistor R1, capacitor C1 is connected in series with resistor R1, and capacitor C1 and resistor R1 are used for RC absorption. Branch b includes a normally open contact of relay KA9 and a coil of contactor K71 connected in series, the coil of contactor K71 is connected in parallel with resistor R2, capacitor C2 is connected in series with resistor R2, and capacitor C2 and resistor R2 are used for RC absorption. The normally open contacts of relay KA1 to KA7 are respectively connected to port 1, port 2, port 3, port 4, port 5, port 6, and port 11 of the inverter through X22.

The main circuit 1 includes a frequency converter, a circuit breaker Q11, and fuses F01~F03. The power input port of the frequency converter is connected to fuses F01~F03 and circuit breaker Q11 in sequence. The power output port of the frequency converter is connected to the main lifting motor of the crane. The frequency converter is used to drive the main lifting motor of the crane to operate; the main circuit 2 includes the normally open main contacts of the contactor K71 and the circuit breaker Q71 connected in series with the holding brake. The main circuit 2 is used to drive the holding brake to operate; the main circuit 3 includes the normally open main contacts of the contactor K31 and the circuit breaker Q31 connected in series with the main lifting motor fan. The main circuit 3 is used to drive the main lifting motor fan to operate; the input ends of the main circuit 1, the main circuit 2, and the main circuit 3 are connected to the AC power supply AC380V.

Working process of the master controller:

The output contact 1, output contact 2, output contact 3 and output contact 4 of the master controller S40 are respectively connected to port 2, port 3, port 4 and port 5 of the digital input module. When the output contact 1 of the master controller S40 is closed, the coil of relay KA3 is energized to realize the first gear forward action of the crane; when the output contact 1 and the output contact 3 are closed, the coil of relay KA3 and the coil of relay KA2 are energized to realize the second gear forward action of the crane; when the output contact 1 and the output contact 4 are closed, the coil of relay KA3 and the coil of relay KA5 are energized to realize the third gear forward action of the crane; when the output contact 1, the output contact 3 and the output contact 4 are closed, the coil of relay KA3 and the coil of relay KA6 are energized to realize the fourth gear forward action of the crane; the master controller S4 0's output contact 2 is closed, the coil of relay KA4 is energized, which is used to realize the first gear reverse action of the crane; output contact 2 and output contact 3 are closed, the coil of relay KA4 and the coil of relay KA2 are energized, which is used to realize the second gear reverse action of the crane; output contact 2 and output contact 4 are closed, the coil of relay KA4 and the coil of relay KA5 are energized, which is used to realize the third gear reverse action of the crane; output contact 2, output contact 3, and output contact 4 are closed, the coil of relay KA4 and the coil of relay KA6 are energized, which is used to realize the fourth gear reverse action of the crane; the main command controller is used to realize the switching of the first gear, second gear, third gear, and fourth gear of the forward or reverse speed of the crane, so that the number of port connections of the digital input module and the digital output module is reduced, and the maintenance amount is reduced.

Braking action process:

A start button is provided on the operating console of the driver's cab. When the operator mistakenly short-circuits the terminals or forces the main lifting brake contactor K71 to be energized by external force, the CPU module can program the system alarm in the control module to cause power failure of the entire vehicle, making it impossible to open the brake (holding brake).

See Figure 6, See Figure 7:

I0.0-------Start button;

I1.0-------The normally open auxiliary contact of the main hoisting brake contactor K71;

I3.0-------Reset;

Q44.1--------Crane main power contactor;

Q48.3--------Main hoisting brake contactor (control K71);

M200.0--------intermediate variable;

T200-------Delayed connection relay;

Step 1: When the operator executes the start button command, I0.0 connects to Q44.1 and the whole vehicle is powered normally;

Step 2: When the operator mistakenly operates or short-circuits the coil of the main hoist brake contactor K71, that is, I1.0 is connected to M200.0, the system alarms, Q44.1 is disconnected, and the whole vehicle is powered off;

Step 3: After I3.0 is reset, I0.0 is restarted and the whole vehicle is powered normally.

The utility model adopts a main command controller and a digital quantity input module to be connected through a port, with less wiring, reduced maintenance and saved production costs; maintenance personnel can query equipment fault information at any time through the touch screen, and fault query is intuitive, saving time and effort; the speed feedback signal of the output end of the crane main lifting motor is fed back to the speed loop control module of the inverter through a pulse encoder, thereby improving the accuracy of the crane lifting action; two holding brakes are used to act at the same time, thereby improving the safety of crane braking. When one holding brake fails or has a hidden danger, the other holding brake can still have a braking effect, thereby avoiding the safety hazard of hook slipping caused by the failure of a single holding brake.

Claims (6)

1. A main lifting control device for a crane, comprising a main lifting motor of the crane, a holding brake, and a main lifting motor fan, characterized in that it also comprises a main circuit 1, a main circuit 2, a main circuit 3, a control circuit, and a main command controller, wherein the main circuit 2 is used to drive the holding brake to operate, the main circuit 3 is used to drive the main lifting motor fan to operate, the main circuit 1 comprises a frequency converter, and the frequency converter is used to drive the main lifting motor of the crane to operate, the input ends of the main circuit 1, the main circuit 2, and the main circuit 3 are connected to an AC power supply 1, the control circuit comprises a digital input module and a digital output module, the digital input module and the digital output module are connected through ports, and the output contacts of the main command controller are respectively connected to the ports of the digital input module. 2. A crane main lifting control device according to claim 1, characterized in that it also includes an encoder, the encoder is arranged on the output shaft of the crane main lifting motor, and the encoder is connected to the frequency converter through a port. 3. A crane main lifting control device according to claim 1, characterized in that the digital output module is connected to the coil of relay KA1~KA9 through a port, and the control loop also includes branch a and branch b connected in parallel, and branch a and branch b are both connected to AC power supply 2, branch a includes the normally open contact of relay KA8 and the coil of contactor K31 connected in series, the coil of contactor K31 is connected in parallel with resistor R1, and capacitor C1 is connected in series with resistor R1, branch b includes the normally open contact of relay KA9 and the coil of contactor K71 connected in series, the coil of contactor K71 is connected in parallel with resistor R2, and capacitor C2 is connected in series with resistor R2; the normally open contacts of relay KA1~KA7 are respectively connected to the inverter through ports. 4. A crane main lifting control device according to claim 1, characterized in that the main circuit 1 also includes a circuit breaker Q11 and fuses F01~F03, the power input port of the inverter is connected with fuses F01~F03 and circuit breaker Q11 in sequence, and the power output port of the inverter is connected to the crane main lifting motor; the main circuit 2 includes the normally open main contact of the contactor K71 connected in series with the holding brake and the circuit breaker Q71; the main circuit 3 includes the normally open main contact of the contactor K31 connected in series with the main lifting motor fan and the circuit breaker Q31. 5. A crane main lifting control device according to claim 2, characterized in that the encoder is a pulse encoder. 6. A crane main lifting control device according to claim 1, characterized in that the control circuit also includes a CPU module, a touch screen, and a power module. The digital input module, the digital output module, the CPU module, and the power module are connected through ports. The CPU module and the touch screen are connected through a communication port, and the power module is used to provide AC power II.