JP3010122B2 - Cable reel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable reel for winding a conductive cable which is stretched between two members which move relatively and which secures electricity between these two members.

[0002]

2. Description of the Related Art Conventionally, a cable reel of this type is used to wind a conductive cable stretched between two members which move relatively to each other to secure a current between these two members. It is used for work machines such as mobile cranes, high-altitude work vehicles, digging poles, etc. These working machines are provided with a telescopic boom in which a multi-stage boom is telescopically inserted and used, and is used to secure current conduction between the base end boom and the distal end boom of the telescopic boom.

[0003] A cable reel used in a mobile crane will be described below. In FIG. 13, a mobile crane A is provided with a telescopic boom 2 which can be turned and raised and lowered on a vehicle 1. The telescopic boom 2 is configured such that the intermediate boom 4 is inserted into the base boom 3 and the front boom 5 is sequentially telescopically inserted into the intermediate boom 4 so as to be telescopically driven by an appropriate telescopic driving means. The base boom 3 has a cable reel B
And the leading end of the conductive cable 6 pulled out from the cable reel B is connected to the leading boom 5 so that the current can always be secured between the base boom 3 and the leading boom 5 irrespective of the expansion / contraction movement of the telescopic boom 2. By using the cable reel B, information can be exchanged between the two.

The cable reel B arranged as described above
Is configured as follows. That is, as shown in FIG. 14, a cantilever-shaped support shaft 8 whose inner end is fixed to a mounting frame 7 mounted on the base boom 3, and the conductive cable 6 rotatably mounted on the support shaft 8. , A spring 10 for urging the drum 9 in the winding direction, and a support between the outer end of the support shaft 8 and the drum 9 so as to be located on the outer end side of the drum 9. An electric rotary joint device 11 mounted concentrically with the shaft 8,
A cylindrical cover 13 having a mounting flange 12 at a base end side opening and covering the electric rotary joint device, and a packing 19 interposed when the mounting flange 12 is fastened to an outer side surface of the drum 9. It is configured with.

The electric rotary joint device 11 includes a plurality of slip rings 14 attached concentrically to the support shaft 8 at the outer end of the support shaft 8, an insulating material 15 interposed between the slip rings 14, A brush holder 16 attached to the outer end side surface of the drum 9, the base end side being held by the brush holder 16, the leading end side being arranged corresponding to each slip ring 14, and having the leading end side always contacting the slip ring 14. An energized brush 17 is provided. And each brush 17
Is connected to one end of each core wire of the conductive cable 6, and to each slip ring 14, one end of each core wire of the introduction cable 18 is connected. It is taken out to the base boom 3 side from the end.

[0006] The cable reel B thus configured is
When the telescopic boom 2 is extended, the conductive cable 6 is pulled out of the drum 9 against the urging force of the spring 10, and when the telescopic boom 2 is contracted, the conductive cable 6 is pulled into the drum 9 by the urging force of the spring 10 and suspended. Act like so. In this way, the conductive cable 6 is drawn into and out of the drum 9 with the expansion and contraction movement of the telescopic boom 2 to rotate the drum 9. This can be performed by the rotary joint device 11. In this manner, information is exchanged between the base boom 3 and the leading boom 5 via the conductive cable 6, the electric rotary joint device 11, and the introduction cable 18 irrespective of the expansion and contraction movement of the expansion and contraction boom 2.

[0007]

By the way, the electric rotary joint device 11 of the cable reel B includes:
There is an electric contact for electrically connecting the rotating part, and it is necessary to give sufficient consideration to prevent a contact failure at this electric contact part. That is, measures are taken to prevent the electric contact portion from corroding due to the ingress of water such as raindrops and causing poor contact. That is, the electric rotary joint device 11 is covered with the cover 13, and the packing 19 is interposed when the mounting flange 12 provided at the base end opening of the cover 13 is fastened to the outer end side surface of the drum 9, The inlet for taking in the conductive cable 6 in the cover 13 is made to have a sealed structure to prevent water from entering. However, if the inside of the cover is made to have a closed structure, dew condensation generated inside due to a temperature change does not escape to the outside, and eventually causes corrosion of the electrical contact portion. Therefore, in order to prevent this, a ventilation hole is provided in a lower portion of the cover where raindrops are relatively hard to enter, and the cover 13 of the cable reel B rotates together with the drum 9 to rotate. Since the vent is not necessarily located below the cover where the raindrops are relatively difficult to enter, there is a problem that the provision of the vent will result in a structure in which raindrop water easily enters. An object of the present invention is to provide a cable reel that solves the above-mentioned problem.

[0008]

In order to achieve the above object, a cable reel according to the present invention winds a conductive cable which is stretched between two members which move relatively and which secures electricity between these two members. A cantilevered spindle whose inner end is fixed to an attachment frame attached to the one member, a drum rotatably attached to the spindle and suspending the conductive cable. A spring for urging the drum in the winding direction, an electric type mounted concentrically with the support shaft between the outer end of the support shaft and the drum so as to be located on the side surface on the outer end side of the drum. A rotary joint device, a cylindrical cover provided with a mounting flange at a base end side opening and covering the electric rotary joint device, and interposed when the flange is fastened to the outer end side surface of the drum In cable reel configured with between Kkin, the cover or the packing, which is constituted with a plurality of pores or narrow groove along the circumferential direction of the cover or packing.

According to a second aspect of the present invention, in the first aspect of the present invention, a cover is provided outside the fine holes or the narrow grooves to cover the fine holes or the fine grooves.

According to a third aspect of the present invention, there is provided a cable reel for winding a conductive cable which is stretched between two members which move relatively and which secures a current between the two members, and which is attached to the one member. A cantilevered spindle whose inner end is fixed to a mounting frame, a drum rotatably mounted on the spindle, and around which the conductive cable is suspended, a spring for urging the drum in a winding direction, An electric rotary joint device mounted concentrically with the support shaft so as to be located on a side surface on the outer end side of the drum between an outer end portion of the shaft and the drum, provided with a mounting flange at a base end opening In a cable reel configured with a cylindrical cover that covers the electric rotary joint device, and a packing interposed when the flange is fastened to a side surface on an outer end side of the drum, The serial packing, is constructed by using a packing material to allow communication between the interior space and the exterior of the cover by a fastening state of the cover.

[0011]

In the cable reel of the present invention constructed as described above, the cover or packing is provided with a plurality of small holes or narrow grooves along the circumferential direction of the cover or packing. Communication and no condensation due to temperature changes. Further, even if water such as raindrops enters the cover, the water can be discharged out of the cover from the small pores or narrow grooves located below. Therefore, corrosion of the electric contact portion of the electric rotary joint device can be prevented.

[0012] According to the second aspect of the present invention, since a cover is provided outside the pore or the narrow groove to cover the pore or the narrow groove, water can enter through the fine hole or the narrow groove. Can be blocked as much as possible. Moreover, once the water has entered, the water can be discharged irrespective of the cover, and the communication by the pores or the narrow grooves is possible regardless of the cover, and there is no condensation.

On the other hand, according to the third aspect of the present invention, since the packing is made of a material that allows communication between the inside space of the cover and the outside when the cover is fastened, the inside space of the cover and the outside are connected. However, there is no condensation due to temperature change. Even if water such as raindrops enters the cover, the water can be discharged out of the cover by the packing located below. Therefore, corrosion of the electric contact portion of the electric rotary joint device can be prevented.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2I for a cable reel C (first embodiment) used in a mobile crane. Note that the cable reel C shown in FIGS. 1 and 2 is different from the cable reel B shown in FIG. 14 and described in the prior art only in the cover part, so only the cover part will be described. .
In the following description, the same reference numerals as those described in the related art will be used for parts other than the cover, and detailed description will be omitted.

In FIG. 1 and FIG. 2, reference numeral 20 denotes a cover, which is provided with a mounting flange 12 at a base end opening, similarly to the conventional one, and a packing 19 is interposed on the outer end side surface of the drum 9. It is concluded. 21 is a cover 20
There are a plurality of pores (eight pores at 45 ° circumferential intervals) provided along the circumferential direction on one side edge of the tip portion of the above.

In the cable reel C of the present invention thus configured, since the inside space of the cover 20 and the outside communicate with each other through the fine holes 21, no dew condensation due to a temperature change occurs.
Further, even if water such as raindrops enters from the upper pores 21, the water can be immediately discharged from the lower pores 21. Moreover, since a plurality of pores 21 are provided along the circumferential direction on one side edge of the front end portion of the cover 20,
The cover 2 together with the drum 9 with the extension and retraction of the extension boom 2
0 indicates any one of the plurality of pores 21 even when rotated.
Are located below, and the pores 21 located below are
More water can be discharged out of the cover 20. Accordingly, it is possible to prevent corrosion of the electric contact portion of the electric rotary joint device 11.

Next, in the above embodiment, the cable reel C having the small holes 21 has been described. However, an embodiment (second embodiment) of the cable reel D having the narrow groove is shown in FIGS. This will be described below. FIGS. 3 and 4 also differ from those shown in FIG. 13 only in the cover part, and the other parts are denoted by the same reference numerals and description thereof is omitted. Only the differences are described below. Reference numeral 22 denotes a cover, which includes a cylindrical side member 23 and a lid 24. The side member 23 is fastened by providing a mounting flange 25 at a base end opening portion in the same manner as a conventional cover, with a packing 19 interposed on the outer end side surface of the drum 9. The tip of the side member 23 is opened,
A plurality of fixtures 26 are provided at appropriate positions in the circumferential direction inside the side member 23 at the opening. The lid 24 covers the front end of the opened side member 23, and has a diameter slightly smaller than the opening of the side member 23 so that a narrow groove 27 is formed between the side member 23 and the front end. It is. (That is, the narrow groove 27 is provided over the entire outer periphery of the lid 24.) The lid 24 is adapted to be appropriately attached to the fixture 26 with bolts or the like.

In the cable reel D of the present invention thus configured, since the inside space of the cover 22 and the outside communicate with each other through the narrow groove 27, dew condensation due to a temperature change does not occur.
Further, even if water such as raindrops enters the narrow groove 27 located above, water can be immediately discharged from the narrow groove 27 located below. Therefore, the electric rotary joint device 11
Can be prevented from corroding the electric contact portions of the electric motor.

In the first embodiment, the case where the cover 20 is provided with only the small holes 21 has been described. However, an embodiment (third embodiment) of the cable reel E provided with a cover for covering the small holes 21 is shown in FIG. 6 and FIG. 6 and described below. 5 and 6, only a cover is provided at the end of the cover 20 of the cable reel C shown in FIG. 1 and described as the first embodiment, and only the cover will be described below. I do. Reference numeral 28 denotes a cover, whose base end is opened, and whose opening is attached to the front end of the cover 20. A plurality of pores 29 (eight pores at an interval of 45 ° around the circumference shifted from the pores 21 by 22.5 °) are provided on one side edge of the cover 28 along the circumferential direction.

Since the cable reel E of the present invention thus configured is provided with the cover 28, the possibility of water entry can be reduced as compared with the cable reel C. Further, even if water such as raindrops enters the inside of the cover 20, the water can be discharged to the outside of the cover 20 from the fine holes 21 and 29 located immediately below. Since the space inside the cover 20 and the outside communicate with each other by the plurality of fine holes 21 and fine holes 29, dew condensation does not occur due to a temperature change. Accordingly, it is possible to prevent corrosion of the electric contact portion of the electric rotary joint device 11.

Another embodiment (fourth embodiment) of a cable reel F having a cover provided with a narrow groove and a cover is shown in FIG. 7 and will be described below. 7 differs from that shown in FIG. 1 only in the cover part, and only the different parts will be described below. Reference numeral 30 denotes a cover, which comprises a cylindrical side member 31 and a lid 32. The side member 31 is provided with a mounting flange 33 at the base end opening like the conventional cover, and is fastened to the outer side surface of the drum 9 with the packing 19 interposed therebetween. The distal end of the side member 31 is also opened, and a mounting flange 34 is provided at the distal end opening.

The lid 32 is a lid for covering the front end opening of the side member 31, and its side edge is bent to form a cover 35 having a U-shaped cross section. Then, the bending is performed so that the diameter becomes slightly larger than the side edge of the flange 34. The side member 31 and the lid 32 are fastened by bolts 37 with a spacer 36 interposed in the mounting flange 34. The spacer 36 is a flat washer having a bolt 37 penetrating the inner diameter and an outer diameter slightly larger than the bolt 37. Therefore, the spacer 36
A narrow groove 38 is formed between the side member 31 and the lid 32 by the thickness of.

Since the cable reel F of the present invention configured as described above has the narrow groove 38, the cover 30
The internal space communicates with the outside through the narrow groove 38, and no dew condensation due to a temperature change occurs. Even if water enters the inside of the cover 30, the water is covered by the narrow groove 38 located immediately below.
Can be discharged outside. Further, since the cover 35 is provided, it is possible to prevent water from entering the cover 30. The cover 35 does not prevent the water that has entered the inside of the cover 30 from being discharged from the narrow groove 38. Therefore, it is possible to prevent corrosion of the electric contact portion of the electric rotary joint device 11.

Another embodiment (fifth embodiment) of a cable reel G having a pore and a cover is shown in FIGS. 8 and 9 and will be described below. 8 and 9 are different from those shown in FIG. 1 only in the cover part, and only the different parts will be described below. Reference numeral 39 denotes a cover, which is provided with a mounting flange 40 at the base end opening similarly to the conventional cover, and is fastened to the outer end side surface of the drum 9 with the packing 19 interposed therebetween.
A plurality of fine holes 41 are provided on the tip side of the cover 39 in the circumferential direction. A cover 42 having a U-shaped cross section is provided outside the front end of the cover 39, and a spacer 43 is interposed between the inside of the outer edge of the cover 42 and the outside of the cover 39. Groove 44 in the same direction as axis 9
Are provided in the circumferential direction.

Since the cable reel G of the present invention having such a structure also has the fine holes 41, the inner space of the cover 39 and the outside communicate with each other through the fine holes 41, so that dew condensation due to a temperature change does not occur. . Further, even if water such as raindrops enters the inside of the cover 39, the water can be immediately discharged to the outside of the cover 39 from the pore 41 located below. Also cover 4
2 and a spacer 43 having a groove 44 between the cover 42 and the cover 39. Therefore, when the groove 44 is located at an upper position, water such as raindrops is prevented from entering. The cover 39 covers the water discharged from the groove 41.
Can be discharged outside. Therefore, the possibility of entry of water such as raindrops into the cover 39 can be almost eliminated. Therefore, it is possible to prevent corrosion of the electric contact portion of the electric rotary joint device 11.

Next, in the above embodiment, the case where the cover is provided with the small holes or the small grooves is described. However, the present invention can be implemented even if the packing has the small holes or the small grooves. Hereinafter, this case will be described as a sixth embodiment, and a cable reel H will be described with reference to FIGS. 10 and 11. 10 and 11 are different from those shown in FIG. 14 and described in the prior art only in the packing, and the parts other than the packing are denoted by the same reference numerals used in the conventional technology. And the description is omitted, and only the parts different from the conventional one will be described below. Reference numeral 45 denotes a packing, which is different from the conventional packing in that a plurality of narrow grooves 46 are arranged in the circumferential direction. This cable reel H
Is provided with a mounting flange 12 and is fastened by interposing the packing 45 on a side surface on the outer end side of the drum 9. At the time of fastening, the narrow groove 46 is fastened to such an extent that the groove is not crushed, A packing having a material that does not collapse during fastening is used. 47 is the packing 4 in the circumferential direction.
5 is a cover having an L-shaped cross section and attached to the drum 9.

The cable reel H configured as described above also
Since the small groove 46 is provided, the inside space of the cover 13 and the outside are communicated by the small groove 46, so that dew condensation due to a temperature change does not occur. Even if water enters the inside of the cover 13, the water can be discharged to the outside of the cover 13 from the narrow groove 46 located immediately below. Further, since the cover 47 is provided, when the narrow groove 46 is located at the upper side, water can be prevented from entering, and when the narrow groove 46 is located at the lower side, water discharged from the narrow groove 46 can be discharged to the outside of the cover 13. Therefore, the possibility of water entering the cover 13 can be almost eliminated. Therefore, the electric rotary joint device 11
Can be prevented from corroding the electric contact portions of the electric motor.

In the above embodiment, the narrow groove 46 is formed in the packing.
However, it is needless to say that the present invention can be implemented even if a fine hole is provided instead of the narrow groove 46.

Further, even if the packing does not have a narrow groove or a fine hole, the packing may be made of a material that allows communication between the inside space of the cover and the outside when the cover is fastened.
Hereinafter, this case will be referred to as a seventh embodiment, in which the cable reel I is used.
This is shown in FIG. 12 and described below. FIG.
14 differs from the one shown in FIG. 14 and described in the prior art only in the packing part. Therefore, the parts other than the packing part are denoted by the reference numerals used in the conventional technique and will not be described. I do. Then, only the packing portion different from the conventional one will be described below. 48
Is a packing made of a material that allows communication between the inside space of the cover and the outside, and is made of glass fiber, a sintered alloy, a mesh metal (a material meshed with a metal such as aluminum, stainless steel, or the like). I have. For the packing which cannot be expected to have a sealing effect at the time of fastening, the mounting flange 12 of the drum 9 and the cover 13 is used.
An elastic material 49 such as rubber is interposed together with the mesh metal.

The cable reel I constructed as described above also
Since the packing 48 is a packing made of a material that allows communication between the inside space of the cover and the outside, there is no condensation. Even if water enters the inside of the cover 13, the water can be discharged to the outside of the cover 13 from the packing 48 located immediately below.

Further, a cover 47 having an L-shaped cross section may be interposed with the packing 45. In this case, entry of water by raindrops from the packing 48 located above is prevented, and water discharged from the packing 48 can be discharged outside the cover 13 when located below. Therefore, the possibility of water entering the cover 13 can be almost eliminated.

[0032]

According to the cable reel of the present invention constructed and operated as described above, it is possible to prevent the dew condensation generated inside the cover due to the temperature change, and to discharge the water that has entered once outside the cover. The cover does not prevent the water that has entered once from being drained out of the cover, but does prevent the raindrops from entering the water. Therefore, even though the cover is a cable reel that rotates with the drum, corrosion of the electric rotary joint device provided inside the cover can be prevented, and the effect can be enhanced.

[Brief description of the drawings]

FIG. 1 is an explanatory view for explaining a cable reel of the present invention, showing a first embodiment in which a cover is provided with pores.

FIG. 2 is an explanatory view of the first embodiment of the present invention, and shows a cross section taken along line XX of FIG.

FIG. 3 is an explanatory view for explaining a cable reel according to the present invention, showing a third embodiment having a narrow groove.

FIG. 4 is an explanatory view of a second embodiment of the present invention, and shows a YY cross section of FIG. 3;

FIG. 5 is an explanatory view for explaining a cable reel of the present invention, showing a second embodiment in a case where a pore and a cover are provided.

FIG. 6 is an explanatory view of a third embodiment of the present invention, showing a ZZ cross section of FIG. 3;

FIG. 7 is an explanatory view for explaining a cable reel of the present invention, and is an explanatory view for explaining another embodiment in which a narrow groove and a cover are provided, and shows a fourth embodiment.

FIG. 8 is an explanatory view for explaining a cable reel of the present invention, and is an explanatory view for explaining another embodiment in a case where a hole and a cover are provided, and shows a fifth embodiment.

FIG. 9 is an explanatory view of the fifth embodiment of the present invention, and shows a VV cross section excluding the electric rotary joint device of FIG. 8;

FIG. 10 is an explanatory view illustrating a cable reel according to the present invention, which is an explanatory view illustrating a case where a packing is provided with a narrow groove and a cover is attached to a drum, and illustrates a sixth embodiment.

FIG. 11 is an explanatory view of a sixth embodiment of the present invention, illustrating only packing.

FIG. 12 is an explanatory diagram for explaining the cable reel of the present invention, and is a diagram for explaining a case where a packing made of a material that allows communication of the atmosphere is provided in an inner space of the cover when the cover is fastened, and FIG. An example is shown.

FIG. 13 is an explanatory diagram illustrating a mobile crane.

FIG. 14 is an explanatory diagram illustrating a conventional cable reel.

[Explanation of symbols]

 C Cable reel D Cable reel E Cable reel F Cable reel G Cable reel H Cable reel I Cable reel 6 Conductive cable 7 Mounting frame 8 Support shaft 9 Drum 10 Spring 11 Electric rotary joint device 12 Mounting flange 19 Packing 20 Cover 20 Pores 27 Groove 28 Cover 30 Cover 35 Cover 38 Fine groove 41 Pores 42 Cover 45 Packing 47 Cover 48 Packing 50 Cover

Claims (3)

(57) [Claims] 1. A cable reel for winding a conductive cable stretched between two members that move relatively to each other to secure current flow between the two members, wherein the cable reel is mounted on an attachment frame attached to the one member. A cantilever-shaped support shaft having its inner end fixed, a drum rotatably mounted on the support shaft and suspending the conductive cable, a spring for urging the drum in a winding direction, and an outer end portion of the support shaft Electrical rotary joint device mounted concentrically with the support shaft so as to be located on the outer end side surface of the drum between the drum and the drum, the electrical rotary joint having a mounting flange at a base end side opening A cylindrical cover over the device,
And a cable reel configured with a packing interposed when the flange is fastened to the side surface on the outer end side of the drum, wherein the cover or the packing is provided with a plurality of narrow portions along a circumferential direction of the cover or the packing. A cable reel comprising a hole or a narrow groove. 2. The cable reel according to claim 1, wherein a cover is provided outside the small holes or the small grooves to cover the small holes or the small grooves. 3. A cable reel stretched between two members that move relatively to wind a conductive cable for securing current between the two members, wherein the cable reel is mounted on an attachment frame attached to the one member. A cantilever-shaped support shaft having its inner end fixed, a drum rotatably mounted on the support shaft and suspending the conductive cable, a spring for urging the drum in a winding direction, and an outer end portion of the support shaft Electrical rotary joint device mounted concentrically with the support shaft so as to be located on the outer end side surface of the drum between the drum and the drum, the electrical rotary joint having a mounting flange at a base end side opening A cylindrical cover over the device,
And a cable reel configured with a packing interposed when the flange is fastened to the side surface on the outer end side of the drum, wherein the packing allows the internal space of the cover to communicate with the outside when the cover is fastened. A cable reel comprising a packing made of a material.