JP2008038501A - Magnet apparatus in construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission system for an electric power generator 12 generating an electric power required for fully giving a magnetic pulling force to an electric magnet device 7 made to a short length for reducing a power loss and a noise generated thereby making a power generating system comprising the electric power generator 12 and its driving device 17, which is made as small as possible for offering an easily mountable power generating system in a front attachment of a hydraulic shovel installed with the electric magnet device 7. <P>SOLUTION: The driving device 17 for the electric power generator 12 is directly connected to a power distributor 9 for driving hydraulic pumps 10 and 11 based on the driving of an engine. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of magnet devices in construction machines such as hydraulic excavators.

In general, if this is a hydraulic excavator in some construction machines, a magnetic tool is attached to the front end of the front attachment as a work tool, and for example, magnetic material such as iron scrap is magnetically attached from the building scrap and lifted to separate it. There are things to do. In this case, the magnet tool is an electromagnet for facilitating removal of the magnetically attached magnetic material. Therefore, it is necessary to provide a generator in such a construction machine (for example, Patent Document 1).
JP 2002-349503 A

  By the way, the provided generator receives pressure oil from a hydraulic pump that supplies pressure oil based on engine driving, drives the hydraulic motor, and generates power based on the driving of the hydraulic motor. For this reason, in the above-mentioned conventional one, there is a problem that not only the power transmission system becomes long and the power loss of the hydraulic drive unit is large, but also a large noise is generated because the power transmission is made with the hydraulic pump, the hydraulic motor, and the generator. is there. In addition, since a power generation unit incorporating a hydraulic motor and a generator must be mounted on the airframe, there is a problem that a large-scale modification is required and it is difficult to secure a mounting space. There are challenges.

  The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is a construction comprising an electromagnet-type magnet tool as a work tool. In a machine, a driving device for driving a generator for supplying electricity to the magnet tool is mounted on a pump driving device for driving a hydraulic pump based on engine driving, and the two driving devices are interlocked to connect the magnet tool. It is a magnet device in a construction machine, characterized in that electricity can be supplied.

  By making the generator of the first aspect directly connected to the pump drive device, the power transmission system to the generator can be shortened, thereby greatly reducing loss of power efficiency and reducing noise, In addition, the power generation system including the generator and its driving device can be reduced in size, which facilitates mounting and secures the mounting space.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a traveling machine body of a hydraulic excavator, and the traveling machine body 1 is configured such that an upper swing body 3 is pivotably assembled to a crawler type lower travel body 2. A front attachment 6 including a boom 4 and an arm 5 is provided, and a tip end magnet tool 7 of the arm 5 is attached as a work attachment (work tool). 4a is a boom cylinder, 5a is an arm cylinder, and 7a is a work tool cylinder (bucket cylinder).

  Reference numeral 8 denotes an engine mounted on the upper swing body 3. The driving force of the engine 8 is input to a hydraulic pump power distribution device 9, and the main pump 10 is driven by a gear transmission mechanism 9 a disposed in the distribution device 9. , 11 is output after power distribution. Pressure oil is supplied from the main pumps 10 and 11, the boom cylinder 4 a, the arm cylinder 5 a, the work tool cylinder 7 a, a turning motor 14 for turning the upper swing body 3, The hydraulic motors 15 and 16 are supplied to perform corresponding hydraulic operations.

  On the other hand, 12 is a generator, and a generator drive mechanism 17 constituting a drive device of the generator 12 is linked to the gear transmission mechanism 9a through an intermediate gear 18. In other words, the distribution device 9 has an opening that faces a part of the gear transmission mechanism 9a (usually covered with a detachable opening / closing lid, and an opening formed by removing the opening / closing lid) 9b. The casing 19 of the mechanism 17 is assembled. By assembling the casing, the intermediate gear 18 that is rotatably supported by the casing 19 via the support shaft 20 is inserted into the opening 9 b of the gear transmission mechanism 9. It meshes with the part that is facing. Reference numeral 19a denotes a cover that covers the support shaft portion of the casing 19, and 20a denotes a bearing that supports the support shaft 20.

  On the other hand, a casing 12c that covers the input shaft 12a portion of the generator 12 and supports the input shaft 12a by a bearing 12b is incorporated in an opening 19b provided in the casing 19, and the input shaft 12a is further a casing. 19, an input gear 21 positioned between the bearings 12b and 12d and fixed to the input shaft 12a meshes with the intermediate gear 18. The generator 12 generates power based on the rotation of the intermediate gear 17 and the input gear 21 in conjunction with driving of the engine 8.

  A control panel 22 is connected to the generator 12 and is further connected to a magnet mode switch 23, a magnet operation switch 24, and a monitor 25. When the magnet mode switch 23 is turned ON while the engine 8 is in a driving state, the generated electricity is supplied to the control panel 22, thereby displaying on the monitor 25 that the electricity is being supplied from the generator 8. In this state, when the magnet operation switch 24 is turned ON, electricity is supplied to the magnet tool 7, whereby the magnet tool 7 generates a magnetizing force so that the magnetic material can be magnetized. The magnetized magnetic material is detached due to the loss of the magnetizing force of the magnet tool 7 when the magnet operation switch 24 is turned off.

  In the embodiment of the present invention configured as described above, the power generation drive mechanism 17 of the power generator 12 that generates power to supply electricity to the magnet tool 7 is directly connected to the power distribution device 9 for the hydraulic pump so that it can be used as a power generator. The power transmission system up to the power generation system can be shortened, so that the loss of power efficiency until power generation can be greatly reduced and noise reduction can be achieved, and the power generation system composed of the generator 12 and the power generation drive mechanism 17 can be reduced in size. This makes it easy to mount the power generation system and secure a mounting space.

It is a schematic side view of a hydraulic excavator. It is a schematic plan view which shows the state which mounted the generator in the engine. It is a schematic circuit diagram of a power transmission system. It is principal part sectional drawing which shows the state which connected the electric power generation drive mechanism with the power distribution device for hydraulic pumps.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling machine body 7 Magnet tool 8 Engine 9 Power distribution apparatus for hydraulic pumps 12 Generator 17 Generator drive mechanism 18 Intermediate gear

Claims (1)

  In a construction machine configured with an electromagnet type magnet tool as a work tool, a drive for driving a generator for supplying electricity to the pump for driving a hydraulic pump based on engine drive A magnet device for a construction machine, characterized in that the device is mounted and the both drive devices are linked and connected so that electricity can be supplied to the magnet tool.

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