JP2005231796A - Lifting magnet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a performance of releasing magnetic bodies including iron pieces in a lifting magnet used for conveyance of the magnetic bodies including iron pieces by utilizing its electromagnet function. <P>SOLUTION: The lifting magnet 1 comprises a magnet body 5 with a hole 4 for a rod bored at a core part 2 and a movable plate 7 made of a material containing soft iron. The movable plate 7 has almost the same area as a attraction surface 5a of the magnet body 5 and the rod 6 on the backside part is loosely inserted into the hole 4 for the rod. When the magnet body 5 is in non-excitation state, the plate 7 is held separately from the attraction surface 5a at a predetermined distance by an elastic force of a spring 10. When the magnet body 5 is excited, the movable plate 7 is absorbed on the attraction surface 5a against the elastic force of the spring 10 and the magnetic bodies including iron pieces are also absorbed through the movable plate 7. When the excitation is released, the magnetic bodies including iron pieces are released while the movable plate 7 returns to the predetermined separated position by the elastic force of the spring 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lifting magnet, and more particularly, to a lifting magnet used for transporting a magnetic material including an iron piece using the function of an electromagnet.

  For example, the following are known as conventional lifting magnets. This lifting magnet is used to open and close the charging lid of a coke oven. A detection rod is provided at the center of the magnet's adsorption surface so as to be slidable in the vertical direction, and the detection rod is attached downward by a coil spring. In addition, a detection bar is provided radially from the lower end of the detection rod in the radial direction of the suction surface, and a limit switch is provided at the upper end of the detection rod corresponding to the upper end. When the charging lid is attracted, when the upper surface of the charging lid comes into contact with the detection bar and the detection bar is pushed upward, the limit switch is turned on at the upper end of the detection rod. (See, for example, Patent Document 1).

In contrast to the lifting magnet used for opening and closing the charging lid of the coke oven, a lifting magnet used for other purposes is known, for example, used for transporting magnetic materials including iron pieces. The lifting magnet attracts and lifts a magnetic body including an iron piece on an attracting surface by exciting an electromagnet, and transports the magnetic body including the iron piece to an appropriate position in the lifted state, and releases the excitation to release the excitation. The magnetic material including iron pieces is released.
Japanese Utility Model Publication No. 7-38158 (first page, FIG. 1).

  In a lifting magnet used for transporting a magnetic material including a conventional iron piece, when the iron piece is relatively small, the iron piece is magnetized when the electromagnet is excited and adsorbed on the attracting surface. There is. For this reason, there is a problem in that even if the excitation is released after the iron piece is transported to an appropriate position while being suspended from the adsorption surface, the relatively small iron piece is not easily separated from the adsorption surface.

  Then, the technical subject which should be solved in order to improve the releasability of the magnetic body containing an iron piece arises, and this invention aims at solving this subject.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 includes an electromagnet, and energizes the electromagnet to attract and lift a magnetic body including an iron piece, and the suspended state. In a lifting magnet that releases the magnetic material at an appropriate position moved in step (b), the magnet body functions as the electromagnet and has a hole for a rod formed in the core portion, and an adsorption surface of the magnet body And a rod fixed to the back surface is attached to the magnet body so as to be freely contacted and separated from the attraction surface by being loosely inserted into the rod hole, and a spring when the magnet body is in a non-excited state. A movable plate made of a material containing soft iron that is held away from the attraction surface by a predetermined distance by the elasticity of When magnetized, the movable plate is attracted to the attracting surface against the elasticity of the spring and the magnetic body is attracted through the movable plate, and when the excitation is released, the movable plate is A lifting magnet that releases the magnetic body at the same time as returning to the separated position by the elasticity of a spring is provided.

  According to this configuration, the excitation of the magnet body attracts the movable plate against the elasticity of the spring, and the magnetic body including the iron piece is attracted and lifted through the movable plate. After the magnetic material including the iron piece is moved to an appropriate position in the lifted state, when the excitation is released, the movable plate is returned to a predetermined separation position by the elasticity of the spring. The contained magnetic body is released from the movable plate vigorously upon receiving a return force of the movable plate to a predetermined separation position.

  A second aspect of the present invention provides the lifting magnet according to the first aspect, wherein the movable plate also serves as a reinforcing plate that reinforces the attraction surface.

  According to this configuration, the movable plate also functions as a reinforcing plate for increasing the suction impact resistance of the suction surface of the magnet body.

  According to the first aspect of the present invention, there is provided a magnet body having a function of an electromagnet and having a hole for a rod formed in a core portion, and a rod fixed to a back surface, which is substantially the same area as the attracting surface of the magnet body. By being loosely inserted into the rod hole, it is attached to the magnet body so as to be able to come into contact with and separate from the attracting surface, and when the magnet body is in a non-excited state, it is held away from the attracting surface by a predetermined distance by the elasticity of the spring. A movable plate made of a material containing soft iron, and when the magnet body is excited, the magnetic body is attracted to the attracting surface against the elasticity of the spring and the magnetic body is interposed through the movable plate. When the excitation is released, the movable plate returns to the separated position by the elasticity of the spring. Since the magnetic body is released, when the magnet body including the iron piece is attracted to the magnet body through the movable plate and the magnet body is de-energized, the magnetic body including the iron piece is movable. Since the plate receives a restoring force that returns to a predetermined separation position by the elastic force of the spring and is released from the movable plate vigorously, there is an advantage that the releasability of the magnetic body including the iron piece can be improved.

  In the invention described in claim 2, since the movable plate also serves as a reinforcing plate that reinforces the adsorption surface, in addition to the effect of the invention described in claim 1, the movable plate further utilizes a reinforcing plate. This configuration has the advantage that a structure for improving the releasability of iron pieces and the like can be realized with a small number of parts.

  For the purpose of improving the releasability of a magnetic body including an iron piece, a rod hole is drilled in the core portion of the magnet body, and the rod which has substantially the same area as the attracting surface of the magnet body and is fixed to the back surface is the rod A movable plate made of a material containing soft iron, which can be brought into and out of contact with the adsorption surface by loosely inserting into the hole, is disposed, and the rod has its upper end facing a spring chamber formed in the upper part of the magnet body and the rod A disc-shaped spring receiver is fixed to the upper end of the spring, and a spring is contracted between the spring receiver and the upper inner wall of the spring chamber. When the magnet body is in a non-excited state, the movable plate is attached to the spring. When the magnet body is energized, it resists the elasticity of the spring. When the movable plate is attracted to the attracting surface and the magnetic material including the iron piece is attracted via the movable plate and the excitation is released, the movable plate is moved to the predetermined separation position by the elasticity of the spring. Simultaneously with the return, the magnetic plate including the iron piece is released with a strong force by the return force of the movable plate to a predetermined separation position.

  Embodiment 1 of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a lifting magnet according to the present embodiment. FIG. 2 is a side view of a hydraulic excavator in which a lifting magnet is attached to the tip of an arm as an example of a lifting magnet moving device. First, the configuration of the lifting magnet according to the present embodiment will be described. As shown in FIG. 1, the lifting magnet 1 is mainly composed of a magnet body 5 having a coil 3 wound around a core 2 and having an electromagnet function. A rod hole 4 is formed in the core 2 of the magnet body 5.

  The magnet body 5 has a substantially the same area as the attracting surface 5a, and a movable plate which is freely contacted and separated from the attracting surface 5a by loosely inserting a rod 6 fixed to the back surface into the rod hole 4. 7 is attached. The upper end of the rod 6 faces a spring chamber 8 formed in the upper part of the magnet body 5, and a disc-shaped spring receiver 9 is fixed to the upper end of the rod 6. A spring 10 is contracted between the spring receiver 9 and the upper inner wall of the spring chamber 8.

  The movable plate 7 is always urged in the separation direction with respect to the attracting surface 5 a by the elasticity of the spring 10, but when the spring receiver 9 abuts on the upper surface of the magnet body 5, The maximum separation amount of the movable plate 7 from is regulated to a predetermined interval.

  When the magnet body 5 is excited, the movable plate 7 is attracted to the attracting surface 5a and effectively attracts a magnetic material such as an iron piece through the movable plate 7, In order to avoid the movable plate 7 being magnetized, it is made of a material mainly composed of soft iron having a small coercive force.

  Here, when the lifting magnet 1 is operated, if a magnetic body such as an iron piece to be attracted is directly received by the attracting surface 5a of the magnet body 5, the attracting surface 5a is easily damaged by an attracting impact by the magnetic body such as an iron piece. For this reason, a reinforcing plate is usually attached to the suction surface 5a in order to increase the suction shock resistance. The movable plate 7 can be configured using this reinforcing plate.

  In addition, a cable 11 for passing a current through the coil 3 is led to the upper part of the magnet body 5 and a chain 12 for attaching to a hydraulic excavator described below is attached.

  FIG. 2 shows a hydraulic excavator 13 for moving the lifting magnet 1 described above. In the hydraulic excavator 13, an upper swing body 16 is mounted on a lower traveling body 14 via a swing mechanism 15 so as to be rotatable. The upper swing body 16 is provided with a cab 17 on one front side thereof, and a boom 18 is attached to the front center portion so as to be able to be raised and lowered. Further, an arm 19 is attached to the tip of the boom 18 so as to be rotatable up and down, and the lifting magnet 1 is attached to the tip of the arm 19 via the chain 12. The cable 11 from the lifting magnet 1 extends to the cab 17, and energization control to the coil 3 is performed by an operation from within the cab 17.

  Next, the operation of the lifting magnet configured as described above will be described with reference to FIGS. 3 and 4. FIG. 3 is a diagram showing a state where the lifting magnet attracts a magnetic material such as an iron piece, and FIG. 4 is a diagram showing a state where the lifting magnet releases the magnetic material such as an iron piece from the state shown in FIG.

  When the lifting magnet 1 is brought close to a magnetic body such as an iron piece as a transported body by an operation from the inside of the cab 17 and the magnet body 5 is excited, as shown in FIG. The magnetic body 20 such as an iron piece is attracted and lifted through the movable plate 7 while being attracted to the attracting surface 5a. When the magnetic body 20 such as an iron piece is lifted, the hydraulic excavator 13 moves to an appropriate transport position. When the magnet body 5 is de-energized at this transport position, as shown in FIG. 4, as the movable plate 7 returns to a predetermined separation position by the elasticity of the spring 10, a magnetic body 20 such as an iron piece. However, the movable plate 7 is released from the movable plate 7 in response to the return force of the movable plate 7 to the predetermined separation position.

  At this time, if the magnetic body 20 includes a relatively small iron piece, the relatively small iron piece is magnetized when being attracted to the attracting surface 5a via the movable plate 7. If the magnet body 5 is simply de-energized, it cannot be easily separated from the lifting magnet 1. On the other hand, in the present embodiment, as described above, when the magnet body 5 is de-energized, the magnetic body 20 such as the iron piece returns the movable plate 7 to the predetermined separation position by the elasticity of the spring 10. Since the force is received, even a relatively small iron piece is reliably released from the lifting magnet 1 and is transported to a predetermined position.

  As described above, in the lifting magnet according to the present embodiment, when the magnet body 5 is de-energized, the magnetic body 20 including the iron piece returns the movable plate 7 to a predetermined separation position by the elasticity of the spring 10. By receiving the restoring force and releasing it from the movable plate 7, even if a relatively small iron piece is included in the magnetic body 20, the releasability from the lifting magnet 1 can be improved. Moreover, since the movable plate 7 is configured using a reinforcing plate, a structure for improving the releasability of an iron piece or the like can be realized with a small number of parts.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The figure shows an embodiment of the present invention.
1 is a longitudinal sectional view of a lifting magnet according to Embodiment 1. FIG. The side view which shows the hydraulic shovel as an example of the moving apparatus of the lifting magnet of FIG. The longitudinal cross-sectional view which shows the state which the lifting magnet of FIG. 1 adsorb | sucked magnetic bodies, such as an iron piece. The longitudinal cross-sectional view which shows a mode that the lifting magnet of FIG. 1 releases magnetic bodies, such as an iron piece, from the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lifting magnet 2 Core 4 Rod hole 5 Magnet body 5a Adsorption surface 6 Rod 7 Movable plate 10 Spring 13 Hydraulic excavator 20 Magnetic body including iron pieces

Claims (2)

In a lifting magnet that includes an electromagnet, attracts and lifts a magnetic body including an iron piece by exciting the electromagnet, and releases the magnetic body by releasing the excitation at an appropriate position moved in the lifted state.
A magnet main body having the function of the electromagnet and having a hole for a rod formed in the core portion, and a rod fixed to the back surface, which is substantially the same area as the attracting surface of the magnet main body, is loosely inserted into the rod hole. As a result, the magnet body is attached to the magnet body so as to be able to come into contact with and away from the attracting surface. With a movable plate,
When the magnet body is excited, the movable plate is attracted to the attracting surface against the elasticity of the spring, and the magnetic body is attracted through the movable plate, and when the excitation is released, A lifting magnet characterized in that the magnetic body is released simultaneously with the movable plate returning to the separated position by the elasticity of the spring.   The lifting magnet according to claim 1, wherein the movable plate also serves as a reinforcing plate for reinforcing the attraction surface.

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