KR101209158B1 - Steel plates transfer system - Google Patents

Abstract

The thick plate conveying system according to the present invention is provided with a lifting magnet 20 for attaching a thick plate by forming a magnetic force by a current supply, and a search magnet provided in the lifting magnet to form a search magnetic field and attaching the thick plate to the lifting magnet. A counter circuit for constructing counting data including magnetic flux sensing means for detecting a change in magnetic flux of a magnetic field and a change value of magnetic flux detected by the magnetic flux sensing means, and converting the counting data into the number of thick plates attached to a lifting magnet; It is made to include.

The magnetic flux detecting means includes a magnetic flux sensor 30 composed of a power coil 34 forming a search magnetic field and a search coil 36 for detecting a change in magnetic flux of the search magnetic field.

According to the present invention, since the magnetic flux sensing means can accurately count the number of thick plates attached to the lifting magnet, the voltage is set based on the voltage table to attach the desired number of thick plates to the lifting magnet as in the prior art. It does not require a cumbersome process of fine tuning.

Therefore, the thick plate of the desired number of sheets can be accurately attached to the lifting magnet and can be transported, thereby improving the work efficiency according to the thick plate transfer.

Description

Steel plates transfer system

The present invention relates to a thick plate conveying system for attaching and conveying a thick plate using a magnetic force.

In general, in order to transfer a thick steel plate, that is, a thick plate (厚板), a so-called magnetic plate transport system using a crane and an electromagnet is mainly used. The conventional plate transport system is externally applied as shown in FIG. A plurality of lifting magnets 10 generating magnetic force by voltage are mounted on the support beam 8, and the support beam 8 is moved by the crane 6.

Lifting magnet 10 is composed of a housing 12 and a magnet coil 14 wound around the housing 12, the magnetic force is induced by applying a voltage to the magnet coil 14, the magnitude of the induced magnetic force Is proportional to the strength of the applied voltage.

In such a conventional thick plate conveying system, the lifting magnet 10 is attached to the thick plate 4 to be lifted and conveyed, and even when a plurality of kinds of thick plates having different lengths (areas) and thicknesses are mixed and stacked. By adjusting the magnetic force of (10), only the necessary number of plates are transferred.

In the prior art, in order to transfer only the required number of thick plates, the so-called voltage table created by systematically arranging the strength of the magnetic force required for the transfer and the voltages for causing the magnetic force in accordance with various requirements such as the size, thickness, and type of the heavy plate is referred to. By using a voltage applied to the lifting magnet 10, a method of changing the magnetic force induced by the lifting magnet 10 is used, which will be described below.

First, a voltage corresponding to the number of sheets to be transported is applied based on the voltage table to only the lifting magnets within the corresponding range except for the lifting magnets out of the plates to be transported among the plurality of lifting magnets 10.

That is, for example, in the case of transporting the three thick plates (# 1, # 2, # 3), as shown in Figure 2 through the voltage table to grasp the voltage value required for the transfer of the three thick plates, The lifting magnet 10 is applied to the lifting magnet 10, and the heavy plate corresponding to the lifting magnet to which the voltage is applied is attached to the lifting magnet, and after the lifting magnet 10 is attached to the heavy plate, the lifting magnet 10 is lifted up through the crane 6. Towing operation is performed, and the actual weight of the thick plate to be lifted is measured through a weight sensing means such as a load cell provided in the crane 6.

At this time, if the actual weight of the thick plate attached to the lifting magnet 10 and the weight to be elevated is matched with the preset weight data based on the voltage table, the elevated plate is transferred as it is, but the difference between the actual weight and the weight data is the tolerance range In case of deviation, it is judged that the number of heavy plates attached to the lifting magnet 10 is wrong, the heavy plate is returned to its original position, and then the voltage is adjusted to adjust the number of heavy plates attached to the lifting magnet 10 and again raise the towing operation. This process is repeated until the measured actual weight and weight data are within the tolerance range.

When the actual weight and the weight data of the thick plate attached to the lifting magnet 10 reach within the tolerance range, it is determined that the correct number of thick plates is attached to the lifting magnet 10, and the transfer operation is performed.

On the other hand, the voltage table used in the prior art is a systematic arrangement of the magnetic force and voltage required for transport in accordance with the requirements of the size, thickness, number of sheets, etc. as described above, the data obtained during repeated experiments or work processes It can be said that it is made on the basis of the standard, and it is continuously modified to include new data as the standard requirements change.

Although the voltage table used in the prior art is made based on data obtained from many experiments and work processes, there are some variables that cannot be accurately predicted only by the pre-made data in actual working situations. As described above, the problem of repeating the towing operation increases.

Variables that occur in actual working conditions include fine voids formed between each loaded plate or foreign matter interposed between each plate, and characteristics of the lifting magnet 10 (aging according to frequency of use). According to the result, a difference occurs between the theoretical magnetic force according to the voltage applied to the lifting magnet 10 and the magnetic force actually applied to the thick plate.

Therefore, according to the conventional thick plate conveying system, not only much effort is required to prepare the voltage table, but also the trial and error must be repeated due to unpredictable variables in the work based on the voltage table. There was a problem that the efficiency of the transfer operation is lowered.

The present invention has been made in order to solve the problems of the prior art as described above, a thick plate transport system that can increase the work efficiency according to the plate transport by accurately counting the number of plates attached to the lifting magnet using the magnetic flux detection means For the purpose of providing

The thick plate conveying system of the present invention having the above object comprises a housing for forming an iron core portion therein, and a lifting magnet for attaching a thick plate by forming a magnetic force by supplying current by a magnet coil wound around the iron core portion. And a magnetic flux sensing means provided in the lifting magnet to form a magnetic field and detecting a magnetic flux change of the magnetic field generated in the process of attaching the rear plate to the lifting magnet, and a change value of the magnetic flux detected by the magnetic flux sensing means. And a counter circuit for constructing counting data and converting the counting data into the number of thick plates attached to the lifting magnet.

The magnetic flux sensing means includes a case having a center pole in the center, a power coil wound around the center pole to form a magnetic field, and a winding around the center pole at one side of the power coil. And a magnetic flux sensor composed of a search coil for detecting a magnetic flux change of the magnetic field.

The lifting magnets are formed in the housing with a plurality of iron cores spaced apart from each other, and each magnet core is wound and mounted to each iron core to have a plurality of magnetic force generating points.

In addition, the thick plate conveying system according to the present invention may comprise a load cell for measuring the weight change value generated by the thick plate attached to the lifting magnet, the counter circuit magnetic flux sensing the weight change value measured by the load cell The counting data is configured by performing integrated analysis with the flux change value detected by the means.

According to the thick plate conveying system according to the present invention, since it is possible to accurately count the number of thick plates attached to the lifting magnet using the magnetic flux sensing means, a voltage table for attaching the desired number of thick plates to the lifting magnet as in the prior art. It does not require a cumbersome process of fine-tuning the voltage based on this.

Therefore, the thick plate of the desired number of sheets can be accurately attached to the lifting magnet and can be transported, thereby improving the work efficiency according to the thick plate transfer.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 to 5B.

The thick plate conveying system according to the present invention includes a lifting magnet for generating a magnetic force and attaching the thick plate, magnetic flux sensing means provided on the lifting magnet to form a magnetic field, and sensing a magnetic flux change of the magnetic field, and the magnetic flux sensing means. And a counter circuit for forming counting data with the changed magnetic flux value and converting the counting data into the number of thick plates attached to the lifting magnet.

As shown in FIGS. 3 and 4, the lifting magnet 20 includes a housing 22 forming an iron core 221 therein and a magnet coil 24 wound around the iron core 221. In particular, the plurality of iron cores 221 are formed to be spaced apart from each other in the housing 22, and the magnet coils 24 are wound and mounted on the respective iron cores 221 to have a plurality of magnetic force generating points. desirable.

The magnetic flux detecting means includes a case 32 having a center pole 321 at the center, a power coil 34 wound around the center pole 321 to form a magnetic field, One side of the power coil 34 is wound on the center pole 321 and comprises a magnetic flux sensor 30 consisting of a search coil (search coil) 36 to grasp the magnetic flux change of the magnetic field.

Here, the case 32 of the magnetic flux sensor 30 may be made of a cylindrical or the like as shown in Figure 3, this form is exemplary, the center pole 321 is formed therein and the center pole 321 Any structure can be used as long as the structure wraps around the power coil 34 and the search coil 36.

In addition, the magnetic flux sensor 30 is attached to the outer surface of the housing 22 of the lifting magnet 20 (not shown), or embedded in the housing 22 to form a central portion of the housing 22 between both magnet coils 24. It is configured in the form arranged in.

The lifting magnet 20 in the thick plate conveying system according to the present invention as described in the prior art, it turns out that is configured in the form of a plurality mounted on the support beam moved by a crane or the like.

Referring to the operation of the thick plate transport system of the present invention configured as described above are as follows.

First, as shown in FIG. 5A, the lifting magnet 20 is moved upward of the rear plate # 1 (hereinafter referred to as the first rear plate) mounted on the uppermost portion, and the height thereof is adjusted to adjust the first first plate (# 1). ) So that a small gap is formed between the two and at a height spaced apart.

When the so-called ready state is completed, a magnetic force is generated by applying a voltage to the magnet coil 24 of the lifting magnet 20. The so-called start voltage applied at the initial stage of operation is set very low so that the first thick plate # 1 Weak magnetic force is formed so that) is not attached.

Subsequently, after the start voltage is applied, the strength of the magnetic force is gradually increased by gradually increasing the applied voltage. When the strength of the magnetic force exceeds a predetermined value, as shown in FIG. ) Is attached to the lifting magnet 20 beyond the gap formed between the lifting magnet 20.

At this time, the lifting magnet 20 is firmly attached to the back plate is maintained in the nature of having a plurality of magnetic force generation point.

After that, when the strength of the magnetic force becomes stronger than the predetermined reference value, the second thick plate # 2 is attached to the lifting magnet, and as the strength of the magnetic force continues, the third thick plate # 3 and the fourth thick plate # 4. The rear plates are attached to the lifting magnets 20 one by one in order, and after the required number of rear plates are attached to the lifting magnets 20, the rear plates are additionally applied to the magnet coils 24 so that the rear plates are not attached to the lifting magnets 20. It will keep the voltage as it is.

On the other hand, in the thick plate attachment process using the lifting magnet 20, in theory, if the voltage supplied to the lifting magnet 20 is increased, the magnetic force also becomes stronger, so that the rear plate continuously lifting magnet 20 without limit of the number Although it is possible to attach the plate to an excessively large number of plates at the actual work site, the moving plate is movable in such a manner as to control the maximum voltage supplied to the lifting magnet 20 as described above, since the risk of work increases. It is preferable to limit the number of, and to be attached to up to six sheets on the basis of a thick plate of 10mm thickness.

In addition, in order to reduce the impact at the moment when the thick plate is attached to the lifting magnet 20, not only the voltage or current may be suppressed for a short time, but also the voltage or current may be temporarily reduced in some cases.

In the process of attaching the rear plate to the lifting magnet 20 as described above, a constant voltage is also applied to the power coil 34 of the magnetic flux sensor 30, and thus, the bottom plate of the lifting magnet 20 is applied. The magnetic field is formed by the power coil 34.

Here, the magnetic field formed by the power coil 34 is different from the magnetic field formed by the magnet coil 24 of the lifting magnet 20, and its strength is weak and constant, and as described below, the magnetic field change is measured. This is called a search magnetic field for convenience.

On the other hand, when the rear plate 4 is pulled up by the lifting magnet 20 to pass through the search magnetic field, the magnetic flux of the search magnetic field is changed. That is, the magnetic flux of the search magnetic field is increased in the process of the ferromagnetic thick plate passes through the search magnetic field, and when the thick plate is attached to the lifting magnet 20 to come into contact with the magnetic flux sensor 30, the magnetic flux of the search magnetic field is not increased any more and is kept constant.

The magnetic flux change of the search magnetic field is sensed by the search coil 36 of the magnetic flux sensor 30, and the search coil 36 has a rear plate from the time point at which the rear plate starts to move (the magnetic flux change of the search magnetic field occurs). It outputs a pulse-type voltage by the change of the magnetic flux up to the time when the movement ends (the time when the change in the magnetic flux of the search magnetic field stops).

In the counter circuit, the voltage in the form of a pulse generated by the magnetic flux sensor 30 is taken as a so-called attaching signal indicating that the thick plate is attached.

That is, for example, when the first thick plate # 1 is first attached to the lifting magnet 20, the counter circuit recognizes one attachment signal, and then the second thick plate # 2 is attached to the lifting magnet 20. When attached, the counter circuit recognizes two attachment signals, and the counter circuit measures the number of plates attached to the lifting magnet 20 through the pulse voltage output from the magnetic flux sensor 30, that is, the attachment signal. will be.

In addition, the search magnetic field formed by the power coil 34 of the magnetic flux sensor 30 is also formed at a constant intensity, and the magnetic flux of the search magnetic field is slowed down as the number of thick plates attached to the lifting magnet 20 increases, eventually increasing the maximum. When the number of attachment sheets is reached, the magnetic flux of the search magnetic field does not occur, and the search coil 36 can no longer output a voltage.

Meanwhile, the thick plate conveying system according to the present invention may include a load cell (not shown) for measuring a weight change value generated by the thick plate attached to the lifting magnet 20. In this case, the counter circuit includes the load cell. The weight change value measured by the integrated magnetic flux change value detected by the magnetic flux sensing means is analyzed to form counting data.

When the weight change value measured by the load cell is integrated with the magnetic flux change value by the deceleration detection means to form counting data, a malfunction of the magnetic flux detection means occurs, and the number and magnetic flux of the thick plate attached to the lifting magnet 20 actually occurs. When the number of sheets of the thick plate detected by the sensing means does not match, it can be grasped.

That is, for example, when two rear plates are actually attached to the lifting magnet 20, while the magnetic flux sensing means detects that three rear plates are attached to the lifting magnet 20, the load cell Through this, since the weight (weight change value) of the thick plate actually attached to the lifting magnet 20 is grasped, the counter circuit converts the weight change value into a number of sheets to calculate a relatively accurate number of sheets (2 sheets). If the number of sheets attached by the magnetic flux detecting means and the number of sheets attached to the plate detected by the load cell do not match, the transfer operation of the plates is stopped or a warning signal is sent to the manager, thereby causing the malfunction to continue. Can be prevented.

As described above, according to the present invention, unlike the prior art of supplying the voltage required for transporting the predetermined number of plates based on the weight data of the predetermined number of plates, an error occurs between the voltage and the magnetic force and thus it is impossible to attach the desired number of plates. No error occurs and the number of thick plates attached to the lifting magnet is accurately measured, so that the desired number of thick plates can be transferred.

1 is a configuration diagram showing the main components of the thick plate transport system according to the prior art.

Figure 2 is an exemplary view showing the operation of the thick plate transport system according to the prior art.

3 is a partial cross-sectional perspective view showing the structure of the lifting magnet of the thick plate transport system according to the present invention.

Figure 4 is a bottom perspective view showing the structure of the lifting magnet of the thick plate transport system according to the present invention.

5a and 5b are exemplary views sequentially showing the operation of the thick plate transport system according to the present invention.

<Description of the symbols for the main parts of the drawings>

20: lifting magnet 22: housing

221: iron core 24: magnet coil

30: magnetic flux sensor 32: case

321: center pole 34: power coil

36: search coil

Claims (5)

A lifting magnet composed of a housing forming an iron core portion and a magnet coil wound around the iron core portion to form a first magnetic field in which strength is increased by supplying current, to sequentially attach at least one thick plate; A magnetic flux provided in the lifting magnet to form a second magnetic field having a weaker intensity and a constant level than the first magnetic field, and detecting a change in magnetic flux of the second magnetic field generated by sequentially attaching the at least one thick plate to the lifting magnet Sensing means; A counter circuit for constructing counting data including a value of a magnetic flux change of the second magnetic field sensed by the magnetic flux detecting means, and converting the counting data into the number of sheets of the at least one thick plate which is sequentially attached to the lifting magnet ; And, The magnetic flux detecting means A case with a center pole in the center, A power coil wound around the center pole to form the second magnetic field; A search coil that is wound around the center pole on one side of the power coil to grasp the magnetic flux change of the second magnetic field. It includes a magnetic flux sensor consisting of, The magnetic flux sensor is disposed outside the magnet coil of the lifting magnet is embedded in the housing Plate transport system, characterized in that. delete A lifting magnet composed of a housing forming an iron core portion and a magnet coil wound around the iron core portion to form a first magnetic field in which strength is increased by supplying current, to sequentially attach at least one thick plate; A magnetic flux provided in the lifting magnet to form a second magnetic field having a weaker intensity and a constant level than the first magnetic field, and detecting a change in magnetic flux of the second magnetic field generated by sequentially attaching the at least one thick plate to the lifting magnet Sensing means; A counter circuit for constructing counting data including a value of a magnetic flux change of the second magnetic field sensed by the magnetic flux detecting means, and converting the counting data into the number of sheets of the at least one thick plate which is sequentially attached to the lifting magnet ; And, The magnetic flux detecting means A case with a center pole in the center, A power coil wound around the center pole to form the second magnetic field; A search coil that is wound around the center pole on one side of the power coil to grasp the magnetic flux change of the second magnetic field. It includes a magnetic flux sensor consisting of, The magnetic flux sensor is disposed outside the magnet coil of the lifting magnet is mounted outside the housing Plate transport system, characterized in that. delete The method according to claim 1 or 3, It comprises a load cell for measuring the weight change value caused by sequentially attaching the at least one thick plate to the lifting magnet, The counter circuit And analyzing the weight change value measured by the load cell with the value of the magnetic flux change of the second magnetic field determined by the magnetic flux sensing means to form the counting data. Plate transport system, characterized in that.

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