JP2003235102A - Current collecting brush and wear detection device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a current collecting brush and a wear detection device therefor capable of accurately detecting that a brush reaches the prescribed amount of wear. <P>SOLUTION: In a current collecting brush 5 equipped with the brush 9 which contacts and slides on a conductor D of a trolley line T and collects current to supply power to the load of the moving equipment, an insulated wire 17 is inserted into a hole 16 to be fixed so as to make the hole 16 penetrated through a bottom 15 to a wear limit position H in the use of the brush 9, expose a conductor 19 by stripping the sheath on the tip of the insulated wire 17 to a prescribed length Ha and form a wear detection part 20 by molding the conductor 19 with insulating materials and dispose the wear detection part 20 in the wear limit position H. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current collecting brush for collecting current by contacting and sliding on a conductor of a trolley wire for supplying electric power to mobile equipment such as a crane and a hoist, and a wear detecting device for the current collecting brush. In particular, the present invention relates to a current collecting brush and a wear detecting device for a current collecting brush that can accurately detect that the brush body of the current collecting brush has worn down to the wear limit without performing inspection work.

[0002]

2. Description of the Related Art Bare trolley wires and insulated trolley wires are widely used for supplying electric power to mobile equipment such as cranes and hoists. For example, as shown in an example of a cross-sectional view in FIG. 9, an insulated trolley wire T is a conductor D made of a conductive metal such as copper and provided with an insulating coating I except for an opening A for contact current collection. is there. The insulated trolley wire T is supported by a hanger (not shown) at regular intervals and laid in parallel along a traveling path of mobile equipment such as a crane and a hoist.
Power is supplied to the mobile device via the collector.

As shown in FIG. 11, a collector C'is a square bar (support bar) 41 for towing a collector provided on a mobile device.
In addition, an arm 44 that is attached so as to be able to rise and fall via a mounting bracket 42, and a current collecting brush 45 that is swingably attached to a tip end portion of the arm 44 via a pin 46 are provided.

The current collecting brush 45 includes a brush holder 47 made of an insulating member, and a brush body 49 made of sintered metal such as carbon or copper, which is supported in the brush holder 47. A lead wire 50 is connected to the brush main body 49, and the lead wire 50 is drawn to the outside and connected to a load of a mobile device such as a motor via a terminal block (not shown). The brush body 49 slides in contact with the conductor D of the trolley wire T as shown in FIG. 9 to collect electric power and supply electric power to the mobile device via the lead wire 50.

A tension spring 51 is connected between the tip of the arm 44 and the mounting member 42, and the arm 44 is pulled upward by the urging force of the tension spring 51, and the brush main body 49 is insulated by the insulating trolley wire T. It is designed to be pressed against the conductor D.

The brush main body 49, as shown in FIG.
The upper surface thereof, that is, the sliding portion 52 with the conductor D has a shape adapted to the conductor D of the insulated trolley wire T. Further, a female screw portion 53 is formed on the side surface portion of the brush main body 49, so that the lead wire 50 shown in FIG. 11 can be connected with a screw.

[0007]

By the way, since the current collection is realized by the sliding contact between the conductor D of the trolley wire T and the brush main body 49 of the collector C ', naturally, the conductor D and the brush are accompanied by the use. The body 49 wears. Normal,
The material of the brush main body 49 is set to be softer than the material of the conductor D of the trolley wire T, and the abrasion of the brush main body 49 is larger than that of the conductor D.

Therefore, conventionally, as shown in FIG. 10, a recess 5 extending from the upper surface (sliding portion) 52 of the side surface of the brush main body 49 to a wear limit position H of the brush main body 49 during use.
4 is formed, and the brush main body 4 is formed until the recess 54 disappears.
When No. 9 was worn, it was judged that the wear limit had been reached and replacement work was performed. That is, conventionally, the brush body 4
The inspection of 9 was carried out regularly to check whether the brush main body 49 has reached the wear limit.

However, in general, the trolley wire T and the collector C'are often mounted at high places, and the inspection of the brush main body 49 is a dangerous and troublesome work. Further, if the inspection is neglected, the brush main body 49 will not be noticed that it has worn too much, and it will not be possible to exert the original current collecting ability, but also the progress of uneven wear, damage to the trolley wire T, and the brush during running. This may cause derailment of the main body 49.

Therefore, as disclosed in Japanese Utility Model Publication No. 54-1687, there has been developed a device for automatically detecting that the brush body has worn to the wear limit and notifying the wear.

In this apparatus, as shown in FIG. 12, auxiliary electrodes 55 are arranged on both sides of the brush main body 49 at the same height as the wear limit position H of the brush main body 49, and the auxiliary pole 5
5, an alarm device 56 such as a lamp is connected.
When the brush main body 49 is worn to the wear limit position H, the conductor D of the trolley wire and the auxiliary pole 55 come into contact with each other to cause a short circuit, and the alarm device 56 notifies that.

However, in this device, since the auxiliary pole 55 is arranged at a position separated from the brush main body 49, there is a problem that the wear of the brush main body 49 cannot be accurately detected. Specifically, for example, when the trolley wire is undulating up and down, the conductor D of the trolley wire and the auxiliary pole 55 do not come into contact with each other, even though the brush body 49 is worn to the wear limit. On the contrary, there is a possibility that the conductor D of the trolley wire and the auxiliary pole 55 may come into contact with each other even though the brush body 49 is not yet worn to the wear limit. Further, when the trolley wire is curved to the left and right (the front-back direction of the paper surface), the auxiliary pole 55 is displaced from directly below the conductor D of the trolley wire, and even if the brush main body 49 is worn to the wear limit, the conductor D of the trolley wire is worn. There is also a possibility that the auxiliary electrode 55 does not come into contact with the auxiliary electrode 55.

Furthermore, when the current collecting brush 45 swings around the pin 46 (see FIG. 11), the conductor D of the trolley wire and the auxiliary pole 55 are not worn even though the brush body 49 is not worn to the wear limit. There is a possibility of contact.

In short, the conventional wear detecting device for the current collecting brush has a problem that it is not possible to accurately detect the time when the brush body reaches the wear limit.

Therefore, an object of the present invention is to solve the above problems and to provide a current collecting brush and a current collecting brush capable of accurately detecting that the brush main body has reached a predetermined wear amount without performing dangerous inspection work. An object is to provide a wear detector.

[0016]

In order to achieve the above object, the present invention provides a collector provided with a brush main body which contacts and slides with a conductor of a trolley wire and collects power to supply power to a load of a mobile device. In an electric brush, the brush main body is provided with a hole penetrating from the bottom surface to the wear limit position of the brush main body in use, and the conductor is exposed by peeling a predetermined length of the insulation coating on the tip of the insulated electric wire. Is molded with an insulating material to form a wear detecting portion, and the insulated electric wire is inserted and fixed in the hole so that the wear detecting portion is located at the wear limit position.

After inserting the insulated wire into the hole, the hole is filled with at least one of thermoplastic resin, thermosetting resin, adhesive or copper powder. It is preferable to fix it in the section.

Further, the present invention provides a wear detecting device for a current collecting brush, comprising a brush main body for contacting and sliding on a conductor of a trolley wire and collecting current for supplying electric power to a load of a mobile device. A hole is formed in the brush body from the bottom surface to the wear limit position of the brush body in use, and the conductor at the tip of the insulated wire is peeled off by a predetermined length to expose the conductor, and the conductor is made into an insulating material. To form a wear detector, and the wear detector is positioned at the wear limit position, the insulated wire is inserted and fixed in the hole, and the rear end of the insulated wire has a voltage When the detecting means is connected and the voltage detecting means is connected to an alarm means, when the brush body is worn to the wear limit position and the conductor of the trolley wire and the conductor of the wear detecting portion are short-circuited, the voltage Detective hand Via is to broadcast by the warning means.

Here, the alarm means may be any one of a lamp, a patrol light and a buzzer, or a combination thereof.

Further, the alarm means is provided at a position apart from the voltage detecting means, and the voltage detecting means sends a signal to the alarm means when the conductor of the trolley wire and the conductor of the wear detecting portion are short-circuited. You may make it equip with the wireless means to operate.

Further, in order to supply a three-phase power source to the mobile equipment, the brush main body contacts and collects the conductors of the three trolley wires, and the voltage detecting means includes a rear end portion of the insulated wire. The insulated brush to which the insulated wire is fixed may be connected to a power source of a different phase.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

First, the overall structure of the collector to which the current collecting brush of this embodiment is attached will be described with reference to FIG.

The collector C has the same structure as that of the collector C'shown in FIG. 11, and can be raised and lowered via a mounting bracket 2 on a collector pulling square bar (support bar) 1 provided in a mobile device. Further, the arm 4 is provided so as to be rotatable around the shaft 3, and the current collecting brush 5 of the present embodiment is swingably attached to the tip end of the arm 4 via a pin 6.
The current collecting brush 5 includes a brush holder 7 made of an insulating member,
The brush main body 9 is supported in the brush holder 7. A lead wire 10 is connected to the brush main body 9, and the lead wire 10 is pulled out to the outside and connected to a load of a mobile device such as a motor via a terminal block (not shown). A tension spring 11 is connected between the tip of the arm 4 and the mounting bracket 2, and the arm 4 is pulled upward by the urging force of the tension spring 11, so that the upper surface of the brush body 9 of the current collecting brush 5 is , And is pressed against the conductor D of the insulated trolley wire T shown in FIG. The brush main body 9 slides in contact with the conductor D of the trolley wire T to collect current, and supplies electric power to the mobile device via the lead wire 10.

Now, the brush main body 9 of the current collecting brush 5 according to this embodiment will be described in detail with reference to FIGS.

The brush main body 9 is made of copper-based sinter-bonded gold, and its upper surface (sliding portion) 12 has a shape adapted to the conductor D of the trolley wire T as shown in FIG. A female screw portion 13 for connecting the lead wire 10 is formed on the side surface of the brush body 9. In addition, in FIG. 1B, the upper surface (sliding portion) 12 is provided on the side surface portion of the brush main body 9.
A recess 14 extending from the brush body 9 to a wear limit position H of the brush body 9 is shown, which is shown as an improvement of the conventional brush body 49 shown in FIG. Therefore, it is not always necessary for the present invention.

As shown in FIG. 3, the brush body 9 is provided with a wear limit position H from the bottom surface 15 in use of the brush body 9.
Two hole portions 16 are provided to extend through. Hole 16
Is not limited to two, and one or three or more may be provided.

An insulated electric wire 17 covered with an insulating coating is inserted into each hole 16. Insulated wire 17
As shown in an enlarged view in FIG. 4, the coating of the tip portion is peeled off by a predetermined length to expose the conductor 19, and the conductor 19 is mold-insulated with a thermoreversible resin to form the wear detecting portion 20. Has been done.

The insulated wire 17 is inserted into the hole 16 from the bottom surface 15 of the brush body 9, and the wear detecting portion 20 at the tip of the insulated wire 17 is located at the same height as the wear limit position H. After the insulated wire 17 is inserted into the hole 16,
The hole 16 is filled with a fixing material 21 such as a thermoreversible resin, a thermosetting resin, an adhesive or copper powder, and the insulated wire 1
7 is fixed in the hole 16. Since the conductor 19 at the tip of the insulated wire 17 is mold-insulated, the brush body 9
And the conductor 19 of the insulated wire 17 will not be short-circuited.

As shown in FIG. 5, the two insulated electric wires 17 drawn out from the brush main body 9 have a slack so as not to hinder the movement of the arm 4, and the lead wire 10 is provided.
And are collectively fixed to the mounting bracket 2.

Next, a wear detecting device for automatically detecting the wear of the brush main body 9 will be described with reference to FIG.

In the present embodiment, the power source for supplying power to the mobile equipment is a three-phase power source, and three conductors D of the trolley wire and three brush bodies 9 for contacting and sliding to collect the current are provided. Two insulated wires 17 each having a wear detecting portion 20 at its tip end are embedded in each brush body 9u, 9v, 9w, and two insulated wires 17 embedded in each brush body 9u, 9v, 9w. The rear end side is connected to each one. Then, the rear end portion of the insulated electric wire 17 connected to one and the brush main body 9 to which the insulated electric wire 17 is fixed
Power source of a different phase from the (current collecting brush) (Brush body 9 is U
V phase, V phase, W phase, W phase, U phase
Phase) and the electric wires 23u, 23v, and
It is connected by 23w. More specifically, the rear end of each insulated wire 17 has voltage detection means 23u, 23v,
The lead wire 1 of the brush main body 9 of different phase via 23w
It is connected to 0u, 10v, and 10w.

The voltage detecting means 23u, 23v, 23w respectively have alarm means 25u, 25 for notifying when a current flows through the voltage detecting means 23u, 23v, 23w.
v, 25w are connected. In this embodiment, the alarm means 25u, 25v, 25w are lamps that can withstand the rated voltage of the trolley wire.

Reference numeral 24 in the figure denotes a terminal block.

The operation of this wear detecting device will be described with reference to FIG.

FIG. 7 shows the two wear detectors 20 in each brush body 9u, 9v, 9w and the conductor D of the insulated trolley wire.
And one switch 26u, 26v, 26w, respectively.
It is an equivalent circuit diagram in the case of trying.

When the brush main body 9 of any phase is worn by contacting and sliding with the conductor D of the trolley wire, and the wear amount reaches the wear limit position H, the mold portion of the wear detecting portion 20 of the insulated wire 17 is worn. Also, the conductor 19 is exposed by abrasion, and the conductor D of the trolley wire and the conductor 19 of the insulated wire 17 are short-circuited. For example, when the U-phase brush main body 9 is worn and the conductor 19 of the insulated wire 17 and the trolley wire conductor D are short-circuited, the switch 26u is turned on, and the lamp 25u is connected to the U-phase and the V-phase. Is illuminated. Similarly, if the brush main body 9 of the other phase wears to the wear limit position H,
The lamp 25 of that phase is turned on.

Therefore, each lamp 25u, 25v, 25w
Are arranged in the vicinity of the respective collectors C, it is possible to visually confirm which collector C of the brush main body 9 has reached the wear limit. At this time, each lamp 25u, 25v,
By arranging 25w downward in the vicinity of each collector C, even for collectors C mounted at high places,
Whether the wear limit of the brush body 9 has reached the wear limit can be easily and safely confirmed from the ground. That is, according to the present invention, the brush main body 9 can be carried out without performing dangerous and troublesome inspection work at a high place.
It can be easily confirmed that the wear limit has been reached.

Further, in the present invention, since the wear detecting portion 20 is integrally embedded inside the brush main body 9, when the trolley wire 22 is vertically undulated or the trolley wire 22 is curved left and right. Even if the brush main body 9 is worn to the wear limit, the conductor D of the trolley wire and the wear detecting portion 2
The conductor 19 of 0 surely contacts. Also, the current collecting brush 5
Even if oscillates, the conductor 19 of the wear detector 20 and the conductor D of the trolley wire will not come into contact with each other unless the brush body 9 reaches the wear limit. Therefore, according to the present invention, it is possible to accurately detect the time when the brush main body 9 reaches the wear limit.

Another embodiment will be described with reference to FIG.

The form shown in FIG. 8 uses a lamp 30 and a buzzer 31 together as an alarm means. Specifically, the relay 32 is connected in series with the lamps 30u, 30v, 30w.
u, 32v, 32w coil portions 33u, 33v, 33w
And connecting the contact parts 35u, 35v, 35w of the relays 32u, 32v, 32w to the AC power supplies 36u, 36v,
36w and the buzzers 31u, 31v, and 31w are connected. In this case, each relay 32u, 32v, 3
The 2w does not have to be arranged in the vicinity of the collector C, and can be provided inside the mobile device or the like.

For example, when the brush main body 9 is worn to the wear limit position H in the U phase and the conductor 19 of the wear detecting section 20 and the conductor D of the trolley wire are short-circuited, the switch 26u is turned on and the lamp 30u and the relay 32u are turned on. Coil part 33
u will be connected to the U and V phases. as a result,
The lamp 30u lights up, the coil portion 33u of the relay 32u is excited, and the contact portion 35u closes. As a result, the buzzer 31u connected to the AC power supply 36u is energized and sounds. In this way, the lamp 30u and the buzzer 31
When used in combination with u, wear can be reliably notified by sound even if the surrounding workers are not paying attention to the lamp 30. Then, which phase of the brush body 9 is worn can be known from the lighting of the lamp 30.

As described above, the alarm means is not limited to the lamp, but may be a patrol light, a buzzer, or a combination thereof.
Various means can be applied.

Further, the alarm means is provided separately from the voltage detecting means 23, and is provided in the voltage detecting means 23 when the conductor D of the trolley wire and the conductor 19 of the wear detecting section 20 are short-circuited. If a signal is transmitted to the alarm means by a wireless means (not shown), it is possible to perform remote management of reaching the wear limit at a remote place such as a monitoring board on the ground.

Although the relay contact is shown as an a contact in FIG. 8, it may be a b contact or a c contact.

[0046]

In summary, according to the present invention, it is possible to reliably detect the replacement time due to the abrasion of the brush main body, without performing a troublesome inspection work which is dangerous at a high place. Also, by using a buzzer or the like via a relay in addition to a visual alarm means such as a lamp, it is possible to reliably notify the wear alarm even if the surrounding workers are not paying attention, In addition, since remote monitoring by wireless is also possible, it is possible to save labor for inspection and management. Further, since the wear detecting portion is embedded in the brush main body, it is possible to accurately detect the wear timing of the brush main body.

[Brief description of drawings]

FIG. 1A is a side view of a brush body according to an embodiment of the present invention. (B) is a front view of the brush main body according to the embodiment of the present invention.

FIG. 2 is a bottom view of the brush body according to the embodiment of the present invention.

FIG. 3 is a front sectional view of a brush body according to an embodiment of the present invention.

FIG. 4 is an enlarged view of a wear detector.

FIG. 5 is an overall view of a collector to which a current collecting brush according to an embodiment of the present invention is attached.

FIG. 6 is an explanatory diagram of a wear detecting device of the present invention.

FIG. 7 is a simplified equivalent circuit diagram of FIG.

FIG. 8 is an explanatory diagram of a wear detecting device according to another embodiment.

FIG. 9 is a cross-sectional view showing an example of an insulated trolley wire.

FIG. 10A is a side view of a conventional brush body. (B) is a front view of the conventional brush main body.

FIG. 11A is a top view of a collector to which a conventional current collecting brush is attached. (B) is a side view of the collector to which the conventional current collecting brush was attached.

FIG. 12 is an explanatory diagram of a conventional wear detection device.

[Explanation of symbols]

5 Current collecting brush 9 Brush body 16 Hole 17 Insulated wire 19 Insulated wire conductor 20 Wear detectors 23u, 23v, 23w Voltage detection means 25u, 25v, 25w, 30u, 30v, 30w Lamps (alarm means) 31u, 31v, 31w Buzzer (alarm means) D Trolley wire conductor H Wear limit position T Trolley wire

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kikuchi New Year             Hitachi, 12-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture             Electric Wire Equipment Co., Ltd. F-term (reference) 5H105 AA08 AA11 AA12 BA01 BA05                       BB06 BB07 CC12 DD03 DD12                       DD22 GG04 GG14

Claims (6)

[Claims] 1. A current collecting brush having a brush main body that contacts and slides on a conductor of a trolley wire and collects power to supply electric power to a load of a mobile device, wherein the brush main body has a bottom surface of the brush main body. Form a hole that penetrates to the wear limit position in use, peel off the coating on the tip of the insulated wire for a predetermined length to expose the conductor, mold the conductor with an insulating material to form the wear detection part, A current collecting brush characterized in that the insulated wire is inserted and fixed in the hole so that the wear detector is located at the wear limit position. 2. After inserting the insulated wire into the hole, at least one of a thermoplastic resin, a thermosetting resin, an adhesive or copper powder is filled into the hole to insert the insulated wire into the hole. The current collecting brush according to claim 1, which is fixed to the. 3. A wear detecting device for a current collecting brush, comprising a brush main body that contacts and slides on a conductor of a trolley wire and collects current to supply power to a load of a mobile device. In addition to forming a hole that penetrates from the bottom surface to the wear limit position of the brush body during use, peel off the insulation coating on the tip of the insulated wire for a specified length to expose the conductor, and mold the conductor with an insulating material. To form a wear detecting portion, and so that the wear detecting portion is located at the wear limit position, the insulated wire is inserted and fixed in the hole, and a voltage detecting means is provided at the rear end of the insulated wire. With the connection, an alarm means is connected to the voltage detecting means, and when the brush body is worn to the wear limit position and the conductor of the trolley wire and the conductor of the wear detecting portion are short-circuited, the voltage detecting means is turned on. Over through A wear detecting device for a current collecting brush, wherein the alarm means is used for notification. 4. The wear detecting device for a current collecting brush according to claim 3, wherein the alarm means is any one of a lamp, a patrol light and a buzzer, or a combination thereof. 5. The alarm means is provided at a position distant from the voltage detecting means, and the voltage detecting means sends a signal to the alarm means when the conductor of the trolley wire and the conductor of the wear detecting section are short-circuited. The wear detecting device for a current collecting brush according to claim 3 or 4, further comprising: 6. A power supply for supplying three-phase power to the mobile device,
The brush main body contacts and collects current to the conductors of the three trolley wires, and the voltage detecting means uses a power supply of a different phase from the rear end of the insulated wire and the current collecting brush to which the insulated wire is fixed. The wear detection device for a current collecting brush according to claim 3, wherein