JPH1042422A - Wiring duct for mechanical facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To electrically connect wiring ducts installed to a machine to each other and the main body of each duct to the lid of the duct with simple structures. SOLUTION: After the flanges 13 of two ducts 5a are put together, metallic conductive screws 24 are screwed in the tapped holes 19 of one flange 13 from the tapped holes 19 of the other flange 13 and temporarily tightened with nuts 25 on the opposite surface of the other flange 13. In addition, conductive screws 26 are screwed in the tapped holes 20 of seat plates 17, attached to the main body 14 of each duct 5a through the tapped holes 20 of the seat plates 17 attached to the lid 15 of the duct 5a and temporarily tightened with nuts 27 on the opposite side. Therefore, the electrical connections between each duct 5a and between the main body 14 and lid 15 of each duct 5a can be secured through the contacting sections between the conductive screws 24 and 26, and tapped holes 19 and 20 in which a metal is exposed, thereby all of the wiring ducts 5 can be maintained at the same potential.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring duct installed between electrical devices such as a terminal box and a control box in mechanical equipment.

[0002]

2. Description of the Related Art In machine equipment of a machine tool such as a transfer machine and a machining center, for example, a plurality of processing units equipped with tools, a transfer device for sequentially transferring a work between the plurality of processing units, and a transfer device A jig device for fixing the conveyed work on the jig is provided, and each of the processing units performs processing while applying cutting oil to the work on the jig. Further, a work unloading device for unloading the processed work to the outside of the machine is provided.

A drive motor for driving the apparatus is connected to each of the above apparatuses, and a plurality of sensors or solenoid valves for detecting the position of each apparatus and the work are provided in a large number. An operation box for operating the machine is provided. The machine is configured to operate. On the other hand, a large number of such control wirings are provided in a control box that houses an NC device for controlling the machine, a sequencer, and the like.

FIG. 1 is an overall configuration diagram of a transfer machine, which includes a transfer bar 1 as a transfer device for transferring a work W, a plurality of processing units 2 for processing the work W,
It comprises an operation box 3, a control box 4, and a wiring duct 5 for collectively storing the wiring associated therewith.

FIG. 2 is a side view of a drilling machine showing an example of the machining unit 2 and shows a transfer bar 1 for transporting a workpiece W to be machined and a jig device 6 for fixing the workpiece W, for example, drilling. The processing unit 2 is disposed on a bed 7 and the operation box 3 is provided at a position where it is easy for an operator to operate.

The jig device 6 and the processing unit 2 have a plurality of sensors 8 for detecting the position of each device and the work, a drive motor 9 for driving the processing unit 2 and an electromagnetic valve 10 for supplying cutting oil. Is provided. These control wires 11 are once connected to the relay terminal box 12.

[0007] Further, ground wires provided in the operation box 3 and the terminal box 12 are connected to ground terminals 30 of the control box 4 containing a power supply opening device (not shown).

In a large-sized mechanical equipment as shown in FIGS. 1 and 2, for example, a straight duct 5a and a plurality of L-shaped or T-shaped ducts 5a each having a predetermined size of about 2000 mm are connected. The wiring duct 5 is assembled. The wiring duct 5A accommodates the wiring 11 connected to the terminal box 12 and the operation box 3 provided around each processing unit 2, and its end is connected to each unit control box 4A. Further, the wiring duct 5B includes a plurality of unit control boxes 4
The wires connected to A are housed collectively, and their ends are connected to the central control box 4B.

FIG. 6 shows the wiring duct 5 shown in FIGS.
2 shows a conventional wiring duct 105, which is configured by connecting a plurality of ducts 105a to each other as described above. Each duct 105a is a conductive metal duct, and flanges 113 are welded to both ends thereof,
The duct 105a is a duct body 114 having an open top.
And a lid 115 that is openably and closably attached to the duct main body 114 via a hinge and closes an opening thereof, and the entire surface is coated with a non-conductive coating. Then, the bolts 122 are inserted into the mounting holes 118 at the four corners with the flanges 113 of the respective ducts 105a connected as shown in FIG. The two ducts 105a are connected to each other by fastening with nuts 123 from the opposite side. After assembling the plurality of ducts 105a in this manner, an operation of electrically connecting the two ducts 105a and between the duct main body 114 and the lid 115 with the ground wire 124 and the ground wire 126 is performed.

The flange 113 of each duct 105a
Bosses 119, 120, 116, and 117 for connecting the ground wire are welded in advance to the side surface in the vicinity, the inner surface of the lid 115, and the inner surface of the duct body 114 at a position corresponding thereto, and the end surfaces thereof are unpainted. ing. This boss 11
9 and the boss 120, and both ends of the ground wire 124 and the ground wire 126 are fixed to the boss 116 and the boss 117 with screws 125, respectively, so that the duct 105a and the duct 105a and the duct main body 114 and the lid 115 are fixed. Ground wire 124 and ground wire 12 each using a thick electric wire
6 are connected to each other. As a result, all the ducts 105a and their lids 115 arranged in the machine are electrically at the same potential, and finally at the same potential as the ground terminal 30 of the control box 4 made of metal.

As described above, the wiring duct 105 is provided with a large number of control wirings 11 housed in a metal duct to prevent the wirings from being damaged by an external force and to control the wirings 11.
If a ground fault occurs in the terminal box 12, the operation box 3, or the wiring duct 105, the ground terminal 3 provided in the control box 4
When the potential becomes the same as 0, and the power circuit device (not shown) provided in the control box 4 detects the leakage, the power supply of the mechanical equipment can be opened. In addition, by covering many wires 11 with a grounded metal duct 105, the influence of electromagnetic noise from other mechanical equipment is prevented, and at the same time, a control panel and an operation box or a terminal box, which are electrical devices of the own machine. Electromagnetic noise generated from itself is cut off by the wiring duct 105,
It does not affect other electrical equipment.

[0012]

By the way, the ground wires 124 and 126 are made of thick electric wires, and
5, the ground wire 1
The work is also troublesome when inducing noise or grounding the wires 24 and 126 themselves, and since the ground wires 124 and 126 protrude to the outside, they obstruct the passage of the worker after installation. Also, depending on the installation environment of the machine, the electric wires may be deteriorated.

Further, the drive motor 9 and the sensor 8 installed in the drilling machine, the electric equipment for operation provided in the operation box 3 and the electric equipment for control housed in the control box 4 have recently been used. The operating voltage is 2V or 3V compared to the conventional AC100V or DC24V.
However, the supply voltage is still at 100 V AC. Therefore, naturally, the influence of noise is relatively increasing.

[0014] In addition, due to the demand to transmit a lot of information, transfer machines and machining centers also require
The wiring between the control box 4 and the operation box 3 frequently uses communication cables, and is susceptible to external noise other than the mechanical equipment, and the electric equipment of the machine tool is emitted from the wiring cables. Electromagnetic waves become high-frequency noise, and a large number of wirings housed in the wiring duct 105 become antennas to radiate high-frequency noise to the outside, possibly affecting other equipment and the like.

In the conventional wiring duct 105, the flange 113 is joined with a non-conductive gasket 121 interposed therebetween, and the gasket 121 has a thickness of several mm, so that the gasket 121 is slightly inserted between the plurality of ducts 105a. Since an electric gap is generated, external or internal noise cannot be sufficiently blocked from the wiring in the wiring duct 105.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wiring duct in mechanical equipment which solves the above problems.

[0017]

In order to achieve the above object, according to the present invention, there is provided a wiring duct installed between a plurality of electric devices such as a terminal box and a control box in mechanical equipment. A plurality of metal wiring ducts having flanges formed at both ends are connected to each other by joining the flanges together, and at least one or more conductive screws are screwed between the joined flanges. This is a wiring duct in a mechanical facility in which a plurality of wiring ducts are electrically connected.

According to the second aspect of the present invention, the wiring duct includes a duct body having an open side and a lid attached to the opening of the duct body so as to be openable and closable. The wiring duct in the mechanical equipment according to claim 1, wherein the conductive screw is screwed in to electrically connect the two.

According to a third aspect of the present invention, there is provided a wiring duct for machine equipment according to the first or second aspect, wherein a joint end surface of the flange of the wiring duct is an exposed metal surface and a conductive gasket is interposed between the two joint end surfaces. It is.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

As shown in FIG. 2, the wiring duct 5 is a straight and L-shaped or T-shaped metal duct 5 having a predetermined size.
a are connected to each other. In FIG. 3, flanges 13 are welded to both ends of each duct 5a, and the duct 5a itself is a duct body 1 having an open upper surface.
4 and the opening 2 of the duct body 14 via a hinge or the like.
9 is closed. In addition, the lid 15
At least one seat plate 16 is provided at the open side end of the housing. On the other hand, a seat plate 17 is also provided on the duct body 14 at a position facing the seat plate 16 when the lid 15 is closed. The entire surface of the duct 5a except for the joint end surface 13a of the flange 13 is coated with a non-conductive coating.

In the connecting portion of each duct 5a,
The flanges 13 of both ducts 5a are aligned with each other, and mounting holes 18 for bolt insertion are formed at four corners of the flanges 13.
The screw hole 19 is formed in at least one portion of the flange 13 and the flange 13. Further, the seat plate 1 of the duct body 14 and the lid 15
The small holes 6 and 17 are provided with a small gap, and the screw holes 20 are formed in a state where they are aligned with each other. That is, the surfaces of the screw holes 19 and 20 are surfaces where the metal material is exposed.

Then, as shown in FIG. 4, a conductive gasket 21 is sandwiched between the unpainted joint end faces 13a of the two flanges 13, bolts 22 are inserted into the mounting holes 18 at the four corners, and are fixed with nuts 23 from opposite sides. Thereby, both ducts 5a are connected. After assembling the plurality of ducts 5a in this manner, an operation of electrically connecting between the two ducts 5a and between the duct body 14 and the lid 15 is performed. That is, the flange 13
A conductive screw 24 made of metal or the like is screwed into the screw hole 19 formed on the other side from the side of one flange 13, and further screwed into the screw hole 19 of the other flange 13, and is fixed with a nut 25 from the opposite side. Also, as shown in FIG.
7, a conductive screw 26 is screwed into the screw hole 20 from one seat plate 16 to the seat plate 17 into the screw holes 20 formed at positions aligned with each other. Stop with Thus, the conductive screw 24,
Through the contact between 26 and the screw holes 19 and 20 on the exposed metal surface, between the ducts 5a and between the duct main body 14 and the lid 15 are electrically connected, and all the wiring ducts 5 maintain the same potential.

Further, a wiring duct 5 installed in the machine
In the middle of the arrangement of the wiring duct 5 or at the end of the wiring duct 5, the metallic control box 4 having the ground terminal 30.
A and 4B are electrically connected to each other through the conductive screws in the same manner as described above, so that each duct 5a, the duct body 14, the lid 15, and the control box 4 can maintain the same potential. The ground wires of the operation box 3 and the terminal box 12 are connected to a ground terminal 28 provided in a nearby duct where they are provided. Therefore, when a ground fault occurs in the wiring used for the machine equipment in the terminal box, the operation box, or the duct, the power supply opening device provided in the control box is opened to open the motor provided in the machine equipment. Etc. can be stopped. Further, radiation of noise from outside the machine and high-frequency noise generated from the electric equipment used in the machine tool itself is prevented, and electromagnetic noise does not affect other equipment and machines.

Further, since the conductive gasket 21 is sandwiched between the two flanges 13, more sufficient electrical continuity between the two ducts 5a, 5a through the surface contact between the gasket 21 and the joint end surface 13a, which is a metal exposed surface. Can be secured.

It should be noted that the present invention is not limited to the above-described embodiment, but can be carried out in the following modified forms.

(1) At least one of the bolt connection portions at the four corners of the flange 13 is used as an electrical connection portion, and a screw hole 19 is formed at that location instead of the mounting hole 18 and a conductive screw 19 is screwed in. In this way, the flange 13 is formed with a total of four holes, for example, three mounting holes 18 and one screw hole 19, and the connection operation is simplified.

As a procedure for connecting the flanges 13, a bolt 22 is inserted into each mounting hole 18 in a state where screws for temporary fixing are previously inserted into the screw holes 19 of both flanges 13 and positioned in the flange surface direction. If the nuts 23 are used, the screw holes 19 of the flanges 13 are always opposed to each other at the time of the subsequent electrical connection work, so that the conductive screw 24 can be easily mounted.

[0029]

As described in detail above, according to the present invention, the following excellent effects can be obtained.

According to the first and second aspects of the present invention,
Since the conductive screws were used to electrically connect the wiring ducts installed on the machine and between the duct body and its lid, reliable conductivity was obtained and a large ground fault current could flow. It is not necessary to connect with a thick electric wire like this, the structure is simple, the wiring duct can be easily installed, and the installation does not hinder the passage of the worker after the installation. In addition, radiation of noise from the outside of the machine and high-frequency noise generated from the machine itself can be prevented, and electromagnetic noise does not affect other equipment.

Further, since the ground wire of the operation box or the terminal box can be connected to the ground terminal of the nearby wiring duct, a long ground wire directly connected to the control box as in the related art is unnecessary, and the wiring material is not wasted. Connection work can be performed easily.

According to the third aspect of the present invention, since the two flanges are connected to each other with the conductive gasket interposed therebetween, the gasket and the duct are electrically connected through the contact with the exposed metal surface of the flange. Electrical continuity is more fully obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a transfer machine as mechanical equipment.

FIG. 2 is a side view of a processing unit.

FIG. 3 is a perspective view showing a wiring duct of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is a perspective view showing a conventional wiring duct.

FIG. 7 is a sectional view taken along the line CC of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer bar 2 Processing unit 3 Operation box 4 Control box 5 Wiring duct 5a Duct 11 Wiring 12 Terminal box 13 Flange 13a Joint end face 14 Duct main body 15 Cover 16 Seat plate 17 Seat plate 18 Mounting hole 19 Screw hole 20 Screw hole 21 Conductivity Gasket 22 Bolt 23 Nut 24 Conductive screw 25 Nut 26 Conductive screw 27 Nut 29 Opening

Continued on the front page (72) Inventor Michio Yamakawa 100 Fukuno-cho, Higashi Tonami-gun, Toyama Pref.

Claims (3)

[Claims] 1. A wiring duct installed between a plurality of electric devices such as a terminal box and a control box in mechanical equipment, wherein a plurality of metal wiring ducts having flanges formed at both ends are joined to each other by connecting the flanges to each other. A wiring duct in machine equipment, wherein said plurality of wiring ducts are electrically connected by screwing at least one or more conductive screws between the joined flanges. . 2. The wiring duct according to claim 1, wherein the wiring duct comprises a duct body having an open side and a lid attached to the opening of the duct body so as to be openable and closable, and at least one conductive screw is provided between the duct body and the lid. The wiring duct according to claim 1, wherein the wiring duct is electrically connected by screwing the wiring duct. 3. The wiring duct according to claim 1, wherein a joint end surface of the flange of the wiring duct is a metal exposed surface, and a conductive gasket is interposed between the joint end surfaces.