CN220283351U - Automatic leveling device for double-lifting-point traveling crane lifting beam - Google Patents

Abstract

The application provides a two hoisting point crane beam automatic leveling device, including travelling crane dolly, first travelling crane lifting hook reel and second travelling crane lifting hook reel, first main hook and second main hook, first motor and second motor, two hoisting point crane beams hang in under first main hook and the second main hook, the electro-magnet hang in under the two hoisting point crane beams. Further comprises: the first reel absolute value encoder and the second reel absolute value encoder are connected to the control device through a towing rope of the travelling crane trolley; the first frequency converter and the second frequency converter are connected with the first motor and the second motor. By using the structure, the problem of different shaft unbalance caused by speed difference of the main crane hook in the manual lifting and descending process is solved, the main crane hook is ensured to be kept in dynamic balance in the lifting and descending process, and even the operation step of manually leveling the double lifting hooks before lifting can be canceled.

Description

Automatic leveling device for double-lifting-point traveling crane lifting beam

Technical Field

The utility model relates to the technical field of automatic control, in particular to an automatic leveling device for a double-lifting-point traveling crane lifting beam.

Background

At present, after an operator manually levels the hanging beam, the hanging beam with double hanging points of a travelling crane can only ensure that the hanging beam can be normally attracted and lifted after normally lifting three cranes, and the hanging beam is only required to be level again, otherwise, the hanging beam is unbalanced, so that the problem that a steel coil cannot be attracted is caused. It is also possible that the lifting beam is uneven, so that the electromagnet cannot attract the steel coil in place, and therefore an operator is required to lay down again and level the lifting beam and then attract the steel coil again. When leveling, operators need to pay attention to the balance degree of the hanging beam in real time, and due to the blocking of the sight during operation, the situation can often occur repeatedly, so that the hanging beam is repeatedly leveled in operation, the lifting efficiency is low, and stable and efficient running of the crane cannot be guaranteed. And manual leveling is difficult to guarantee precision, and safety production risks exist.

Disclosure of Invention

In view of this, the application provides a two hoisting point crane hanging beam automatic leveling device for replace the work of manual leveling hanging beam of personnel, in order to improve handling efficiency and security. The concrete structure comprises: the travelling crane trolley is used for driving a double-lifting-point lifting beam to move, a first travelling crane lifting hook winding drum and a second travelling crane lifting hook winding drum, a steel cable, a first main hook and a second main hook used for coiling and lifting are used, the steel cable is respectively connected with the first travelling crane lifting hook winding drum and the second travelling crane lifting hook winding drum, a first motor and a second motor respectively supply power for the first travelling crane lifting hook winding drum and the second travelling crane lifting hook winding drum, the first main hook and the second main hook are used for suspending the double-lifting-point lifting beam, the double-lifting-point lifting beam is used for suspending an electromagnet, and the electromagnet is used for adsorbing a lifting object. Wherein, still include: the first reel absolute value encoder is arranged on the first crane hook reel, the second reel absolute value encoder is arranged on the second crane hook reel, and the first reel absolute value encoder and the second reel absolute value encoder are respectively and electrically connected with the control device. A first frequency converter and a second frequency converter. The first frequency converter is electrically connected with the first motor, and the first frequency converter is electrically connected with the control device. The second frequency converter is electrically connected with the second motor, and the second frequency converter is electrically connected with the control device.

With the structure, the heights of the first main hook and the second main hook are detected in a closed loop through the first reel absolute value encoder and the second reel absolute value encoder which are coaxially arranged with the first crane hook reel and the second crane hook reel. The two reel absolute value encoders are electrically connected with the control device, and the control device sends a control signal to the frequency converter by receiving the lifting hook height signal transmitted by the reel absolute value encoder, and the frequency converter controls the voltage in the circuit so as to control the running speed of the motor, so that the height of the lifting hook is changed to the expected height. Therefore, the double-lifting-point lifting beam realizes automatic leveling, the lifting efficiency is effectively improved, the uncertainty of manual operation is reduced, and the safety risk is reduced.

As one possible implementation manner, the first motor and the second motor are installed in a mirror image mode at the center of the travelling trolley, and the rated capacities and brands of the two motors are consistent; the first lifting hook winding drum and the second lifting hook winding drum are installed in a mirror image mode at the center of the travelling trolley.

By adopting the possible implementation mode, the mirror image installation mode can balance the first hanging point and the second hanging point, and is convenient to control. The rated capacity and the brand of the first motor and the second motor are consistent, so that the control device can control the first frequency converter and the second frequency converter by the same logic, the cost is reduced, and the device works more stably.

As one possible implementation, the first and second reel absolute value encoders are feedback height sensors.

By adopting the possible implementation manner, the first reel absolute value encoder and the second reel absolute value encoder can feed back the height information to the control device, so that the control and adjustment of the frequency converter are realized.

As a possible implementation, the control device may be a PLC controller provided in a crane control room.

By adopting the possible implementation manner, the PLC controller for controlling the main hook can be utilized to realize the automatic control of the first motor and the second motor. The circuit can be simplified and the cost can be reduced.

Drawings

The individual technical features of the present application and their relationships are further described below with reference to the accompanying drawings. The drawings are exemplary, some technical features are not shown in actual proportion, and some drawings may omit technical features that are conventional in the art to which the present application pertains and are not essential to understanding and realizing the present application, or additionally show technical features that are not essential to understanding and realizing the present application, that is, combinations of the technical features shown in the drawings are not limiting the present application. In addition, throughout this application, like reference numerals refer to like elements. The specific drawings are as follows:

FIG. 1 is an elevation view of a dual suspension point crane hoist beam auto leveling device provided herein;

FIG. 2 is a first view of the dual suspension point crane hoist beam auto leveling apparatus provided herein;

fig. 3 is a schematic circuit diagram of the automatic leveling device for the double-lifting-point crane lifting beam.

Reference numerals illustrate: 110-a first crane hook reel; 111-a first reel absolute value encoder; 120-a first primary hook; 130-a first motor; 131-a first frequency converter; 140-a second crane hook reel; 141-a second hook roll absolute value encoder; 150-a second primary hook; 160-a second motor; 161-a second frequency converter; 170-a travelling trolley; 200-control device.

Detailed Description

Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, all technical and scientific terms used throughout this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In the event of inconsistency, the meaning described throughout the application or derived from what is described throughout the application. In addition, the terminology used in the description is for the purpose of describing the embodiments of the present application only and is not intended to be limiting of the present application.

< basic Structure >

The structure of the embodiment of the double-lifting-point crane hanging beam automatic leveling device is set according to the inherent characteristics of the crane hanging beam. As shown in fig. 1 and 2, on the left side of the traveling carriage 170, a first traveling hook drum 110 and a first motor 130 are installed, the first motor 130 provides power to the first traveling hook drum 110, a wire rope is wound on the first traveling hook drum 110, and a first main hook 120 is suspended by the wire rope, a first drum absolute value encoder 111 is coaxially installed in the first traveling hook drum 110, the first drum absolute value encoder 111 is electrically connected to the control device 200, and the control device 200 is electrically connected to the first frequency converter 131. It will be appreciated that on the right side of the trolley 170, a second travelling crane hook drum 140 and a second motor 160 are mounted, the second motor 160 powers the second travelling crane hook drum 140, the second travelling crane hook drum 140 is coiled with a steel cable and suspends a second main hook 150 via the steel cable, a second drum absolute encoder 141 is coaxially mounted in the second travelling crane hook drum 140, the second drum absolute encoder 141 is electrically connected with the control device 200, and the control device 200 is electrically connected with a second frequency converter 161. A double-hanging-point hanging beam is installed below the first main hook 120 and the second main hook 150, and an electromagnet is installed below the double-hanging-point hanging beam and used for attracting the transported objects such as wires, steel coils and the like. As shown in fig. 3, the absolute value encoder is installed on the traveling hook drum to detect the height of the main hook in a closed loop, is connected to the control device 200 by a DP cable through a streamer, and the control device 200 is electrically connected to the first frequency converter 131 and the second frequency converter 161, respectively, and the first frequency converter 131 and the second frequency converter 161 control the first motor 130 and the second motor 160, respectively, and are electrically connected, respectively.

In this embodiment, the control device 200 is electrically connected to the first frequency converter 131 and the second frequency converter 161 by a cable; the first frequency converter 131 and the second frequency converter 161 are electrically connected with the first motor 130 and the second motor 160 by a drag cable.

In this embodiment, the control device 200 may be a PLC controller of an electric room controlling a main hook system. In other embodiments, the PLC controller may be separately provided for automatic control.

Wherein, travelling trolley 170 can move on the track, and the operation of dispatching is realized by matching with the up-and-down movement of the electromagnet.

Wherein the first spool absolute value encoder 111 and the second spool absolute value encoder 141 are feedback height sensors controlled in a closed loop.

< working logic >

The purpose of the adjustment of the horizontal height of the double hanging points is to level the electromagnet to keep balance, so that the steel coil can be hung.

The leveling control method essentially controls the speeds of the first frequency converter 131 and the second frequency converter 161 of the left and right suspension points.

The principle of automatic leveling of the double-lifting-point traveling crane lifting beam is as follows:

according to the actual heights H1 and H2 fed back by the first and second reel absolute value encoders 111 and 141, the heights of the double suspension points are averaged to obtain an average value avg= (h1+h2)/2, and deviation values d1=h1-AVG and d2=h2-AVG of the actual heights relative to the average height are obtained. Meanwhile, a distance range constant X is set according to actual working requirements so as to restrict the deviation values D1 and D2, and therefore adjustment cannot be out of control. The distance range constant X is a positive and negative range value (-X, X). X is used for comparing with deviation values D1 and D2 respectively, and the following five working conditions can be classified:

1. when the deviation value is within the range X, the control device 200 applies a speed coefficient of y=1 to the rising speed of the main hook, i.e., the rising speed of the main hook does not change the existing speed;

and then judging according to the positive and negative rotation of the main hook, if the main hook rotates positively, the speed of the main hook is positive, and in the rising process of the main hook,

2. when the deviation value is not in the X range, if the deviation value is larger than the positive value X in the X range, dividing the deviation value by X to obtain a speed coefficient Y in the range of 0-0.9, namely the rising speed of the main hook is reduced;

3. when the deviation value is not in the X range, if the deviation value is smaller than the negative value-X of the X range, dividing the deviation value by X to obtain a speed coefficient Y in the range of 1-1.9, namely the rising speed of the main hook is increased;

if the main hook is reversed, the speed of the main hook is negative, the main hook is in the descending process,

4. when the deviation value is not in the X range, if the deviation value is larger than the positive value X in the X range, dividing the deviation value by X to obtain a speed coefficient Y in the range of 1-1.9, namely the descending speed of the main hook is increased;

when the deviation value is not within the X range, if the deviation value is smaller than the negative value-X of the X range, dividing X by the deviation value can obtain a speed coefficient Y ranging from 0 to 0.9, namely the descending speed of the main hook is reduced.

5. Finally, the double hanging beams can be adjusted in real time according to the average height, and the first and second ranges of the constant X of the distance range are controlled, so that the dynamic balance of the double hanging beams is achieved.

< summary >

In the embodiment of the double-lifting-point crane lifting beam automatic leveling device, the height information of the first main hook 120 and the second main hook 150 can be collected through the first reel absolute value encoder 111 and the second reel absolute value encoder 141 respectively; the height information is sent to the control device 200, and the operation is carried out through the working logic; the control device 200 transmits control signals to the first frequency converter 131 and the second frequency converter 161, thereby achieving the purpose of changing the speeds of the first main hook 120 and the second main hook 150 by controlling the first motor 130 and the second motor 160 so as to achieve automatic dynamic balance of the first main hook 120 and the second main hook 150.

In summary, the method solves the problem of different axial unbalance caused by speed difference of the main crane hook in the manual lifting and descending process, ensures that the main crane hook can keep dynamic balance in the lifting and descending process, and even can cancel the operation step of manually leveling the double lifting hooks before lifting.

The term "comprising" as used throughout this application should not be construed as limited to what is listed thereafter; it does not exclude other elements or steps.

It will be appreciated that those skilled in the art may implement the application in any suitable manner combining features of one or more embodiments mentioned throughout the application with features of other embodiments.

Note that the above is only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will appreciate that the present application is not limited to the particular embodiments described herein, but is capable of numerous obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the technical concept of the present application, which falls within the protection scope of the present application.

Claims (3)

1. An automatic leveling device for a double-hanging-point crane hanging beam comprises a crane trolley for driving the double-hanging-point crane beam to move,

A first crane hook drum and a second crane hook drum for coiling and lifting a steel cable,

A first main hook and a second main hook which are respectively connected with the first crane hook winding drum and the second crane hook winding drum through steel cables,

A first motor and a second motor respectively provide power for the first crane hook drum and the second crane hook drum,

the first main hook and the second main hook are used for suspending double-hanging-point hanging beams, the double-hanging-point hanging beams are used for suspending electromagnets, and the electromagnets are used for adsorbing a lifting object, and the device is characterized by further comprising:

a control device;

the first reel absolute value encoder is arranged on the first crane hook reel, the second reel absolute value encoder is arranged on the second crane hook reel, and the first reel absolute value encoder and the second reel absolute value encoder are respectively and electrically connected with the control device;

a first frequency converter and a second frequency converter,

the first frequency converter is electrically connected with the first motor, the first frequency converter is electrically connected with the control device,

the second frequency converter is electrically connected with the second motor, and the second frequency converter is electrically connected with the control device.

2. The automatic leveling device for the double-lifting-point traveling crane lifting beam according to claim 1, wherein,

the first motor and the second motor are installed in a mirror image mode at the center of the travelling crane trolley;

the first travelling crane lifting hook winding drum and the second travelling crane lifting hook winding drum are installed in a mirror image mode at the center of the travelling crane trolley.

3. The dual drop center crane hoist beam auto leveling device of claim 1, characterized in that the control device includes a PLC controller disposed in a crane control room.