KR102461811B1 - Slip Ring Equipment - Google Patents

Abstract

The present invention relates to a hollow slip ring mechanism capable of supplying power and transmitting signals without twisting wires when supplying power or transmitting signals to rotating electronic devices,
A lower fixed case 11 having an inner support groove 11a of a circular ring-shaped lower fixed case having an upper side and an open inner side; Formed on the outside of the circular tube-shaped upper fixed case tube body portion 12a, the upper fixed case inner seating groove 12b1 of the circular ring shape with the lower and inner sides open, and the upper fixed case seating groove 12b1 open up and down An upper fixed case 12 having a ring-shaped upper fixed case seating portion 12b formed inside the upper portion of the upper fixed case tube body 12a by having an upper fixed case fixed wire insertion hole 12b2 that becomes a fixed case 10;
a circular ring-shaped lower seat body 21 rotatably installed in the lower fixed case inner support groove 11a; Rotating case tubular body 22 of a circular tubular shape installed inside the rotating case lower seat body 21; A rotating case upper seat body having a rotating case rotating wire insertion hole 23a opened up and down, formed on the upper side of the rotating case tube body 22, and rotatably installed in the upper fixed case inner seating groove 12b1 ( 23); and a rotating case 20 that is rotatably installed in the fixed case 10;
A circular ring-shaped connecting rotary ring insertion groove (51a) opened at the upper and inner sides, an iron plate ring insertion groove (51b) formed below the connecting rotary ring insertion groove (51a) by opening downward, and a connecting rotary ring insertion It is located outside the groove (51a), is formed to open up and down, and has a connection fixing ring fixed wire insertion hole (51c) into which the fixed wire (L1) passing through the upper fixed case fixed wire insertion hole (12b2) is inserted. Ring-shaped connection fixing ring 51; The magnet insertion groove (52a) opened downward, and the rotation wire (L2) which is opened up and down and is opened up and down to be located inside the magnet insertion groove (52b) and passed through the rotation case rotation wire insertion hole (23a) ) is provided with a connecting rotating ring rotating wire insertion hole (52b) into which is inserted, rotatably installed in the connecting rotating ring insertion groove (51a) of the connecting fixing ring (51), the rotating case tube body (22) is inserted and fastened Connecting rotating ring 52 of a circular ring shape to be; an iron plate ring 53 having a circular ring shape installed in the iron plate ring insertion groove 51b; A magnet (54) installed in the magnet groove insertion groove (52a) to pull the iron plate ring (53); and a connection mechanism (50) configured to conduct electricity
It is characterized in that it includes.

Description

Hollow Slip Ring Equipment {Slip Ring Equipment}

The present invention relates to a hollow slip ring mechanism capable of supplying power and transmitting signals without twisting wires when supplying power or transmitting signals to rotating electronic devices.

Conventional slip rings include a carbon type, a brush type, a mercury type, and the like.

The carbon type can be used with a high current per contact point, is inexpensive, and has a simple structure. However, the carbon type cannot provide smooth power supply and signal transmission to electronic devices that require rotation due to large fluctuations in contact resistance. In addition to being limited, there is a problem that the service life is short.

In addition, the brush type can use many contacts, can match various sizes and the number of contacts according to manufacturing characteristics, and can be mounted on an end, a hollow type, a pancake type, and the like. However, the brush type has a problem in that noise (a state in which it is difficult to smoothly supply power and transmit signals to electronic devices) is generated as much as the carbon type.

In addition, the mercury type uses mercury, which is a liquid metal, and can be used with a high current per contact point, can be manufactured in a small volume, generate less noise, and can be used semi-permanently. However, as the number of contacts increases, the mercury type becomes expensive due to an increase in manufacturing cost for sealing the lead, and there is a problem in that a separate coupling is required for installation.

In addition to this, the conventional slip ring as described above is vulnerable to waterproofing, so there is a limit to using it in water.

Republic of Korea Patent No. 10-1398093

The present invention was invented to solve the above problems, and it is an object to solve the problem to provide a hollow slip ring mechanism that does not generate noise, prevents the generation of scattering powder due to friction, and is waterproof.

The present invention for solving the above problems,

A lower fixed case 11 having an inner support groove 11a of a circular ring-shaped lower fixed case having an upper side and an open inner side; Formed on the outside of the circular tube-shaped upper fixed case tube body portion 12a, the upper fixed case inner seating groove 12b1 of the circular ring shape with the lower and inner sides open, and the upper fixed case seating groove 12b1 open up and down An upper fixed case 12 having a ring-shaped upper fixed case seating portion 12b formed inside the upper portion of the upper fixed case tube body 12a by having an upper fixed case fixed wire insertion hole 12b2 that becomes a fixed case 10;

a circular ring-shaped lower seat body 21 rotatably installed in the lower fixed case inner support groove 11a; Rotating case tubular body 22 of a circular tubular shape installed inside the rotating case lower seat body 21; A rotating case upper seat body having a rotating case rotating wire insertion hole 23a opened up and down, formed on the upper side of the rotating case tube body 22, and rotatably installed in the upper fixed case inner seating groove 12b1 ( 23); and a rotating case 20 that is rotatably installed in the fixed case 10;

A circular ring-shaped connecting rotary ring insertion groove (51a) opened at the upper and inner sides, an iron plate ring insertion groove (51b) formed below the connecting rotary ring insertion groove (51a) by opening downward, and a connecting rotary ring insertion It is located outside the groove (51a), is formed to be opened up and down, and has a connection fixing ring fixed wire insertion hole (51c) into which the fixed wire (L1) passing through the upper fixed case fixed wire insertion hole (12b2) is inserted. Ring-shaped connection fixing ring (51); The magnet insertion groove (52a) opened downward, and the rotation wire (L2) which is opened up and down and is opened up and down to be located inside the magnet insertion groove (52b) and passed through the rotation case rotation wire insertion hole (23a) ) is provided with a connection rotating ring rotating wire insertion hole (52b) into which it is inserted, rotatably installed in the connection rotating ring insertion groove (51a) of the connection fixing ring (51), and the rotating case tube body (22) is inserted and fastened Connection rotating ring 52 of the circular ring shape to be; an iron plate ring 53 having a circular ring shape installed in the iron plate ring insertion groove 51b; A magnet (54) installed in the magnet groove insertion groove (52a) to pull the iron plate ring (53); and a connection mechanism (50) configured to conduct electricity

It is characterized in that it includes.

The means of solving the second problem of the present invention is,

In the means for solving the first problem,

At least two or more upper fixed case fixed wire insertion holes 12b2 of the upper fixed case seating portion 12b are provided,

At least two or more rotating case rotating wire insertion holes 23a of the rotating case upper seating body 23 are provided,

The connection mechanism 50 is installed in a stacked manner between the fixing case 10 and the rotating case 20 so that at least two or more are located on the same line vertically, and the connection fixing ring of the connection mechanism 50 located at the top The fixed wire inserting hole 51c and the connecting rotating ring rotating wire inserting hole 52b are in communication with the upper fixed case fixed wire inserting hole 12b2 and the rotating case rotating wire inserting hole 23a, respectively, so that electricity is energized,

At least two or more communication holes 61 that are opened up and down and communicate with the connection fixing ring fixed wire insertion hole 51c, and the rotation case tube body 22 that is opened up and down and are inserted, and the connection rotation ring rotation wire insertion hole 52b ) and having an insertion hole 62 communicating with it, and further comprising a ring-shaped insulating ring 60 installed between the connection mechanism 50 and the connection mechanism 50 .

The solution to the third problem of the present invention is,

In the means for solving the first or second task,

The lower seat body 21 of the rotating case is characterized in that the upper side is opened and provided with a lubricant receiving groove (21a) in the shape of a ring in which the lubricant is accommodated.

The solution to the fourth problem of the present invention is,

In the means for solving the first or second task,

A ring-shaped first packing 30 is provided between the lower fixed case 11 and the lower rotating case seat 21,

It is characterized in that a ring-shaped second packing (40) is provided between the upper fixed case seat part (12b) and the rotating case upper seat body (23).

The present invention according to the means for solving the above problems, the connection fixing ring 51 and the connection rotation ring 52 are in close contact while the connection rotation ring 52 rotates, the connection fixing ring 51 and the connection rotation ring Since electricity is stably passed through (52), there is an effect of stably driving the electronic device without noise (a state in which it is difficult to supply power smoothly and transmit a signal to the electronic device).

In addition, the present invention has the effect of increasing the service life by minimizing friction generated by the rotation of the connecting rotary ring 52 through the lubricant accommodated in the lubricant receiving groove 21a of the rotating case 20 .

In addition, according to the present invention, the first and second packings 30 and 40 are installed in the contact portion between the fixed case 10 and the rotating case 20 , and the waterproofing efficiency is improved.

In addition, in the present invention, when a plurality of connection devices 50 are used, a plurality of fixed wires ( L1) and the rotating wire (L2) can be conveniently installed.

1 is a cross-sectional view for explaining the present invention,
Figure 2 is a view showing a part A of Figure 1,
3 is a view showing part B of FIG. 2,
4 is a cross-sectional view taken along line X-X' of FIG. 1,
5 is a cross-sectional view for explaining the first and second packing of the present invention,
Figure 6 is an exploded perspective view of the present invention corresponding to Figure 1 but showing two connection mechanisms,
7 is an exploded perspective view for explaining the connection mechanism of the present invention,
8 is a view for explaining the operation of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Hereinafter, the present invention will be described in detail so that a person of ordinary skill in the art can easily carry out the present invention.

1 is a cross-sectional view for explaining the present invention, FIG. 2 is a view showing part A of FIG. 1, FIG. 3 is a view showing part B of FIG. 2, and FIG. 4 is a cross-sectional view taken along line X-X' of FIG. 5 is a cross-sectional view for explaining the first and second packing of the present invention, FIG. 6 is an exploded perspective view of the present invention corresponding to FIG. 1 but showing two connecting mechanisms, and FIG. 7 is a connecting mechanism of the present invention As an exploded perspective view for explaining the , the configuration of the present invention will be described with reference to FIGS. 1 to 7 as follows.

The hollow slip ring mechanism according to the present invention includes a fixed case 10 , a rotating case 20 , a first packing 30 , a second packing 40 , a connection mechanism 50 , and an insulating ring (60).

As shown in FIGS. 1 to 4 and FIG. 6 , the fixed case 10 includes a lower fixed K 11 , an upper fixed case 12 , and a support ring 13 . In this embodiment, the fixing case 10 is preferably made of a non-conductive material.

The lower fixed case 11 includes a lower fixed case inner support groove 11a of a circular ring shape with upper and lower sides open, and a lower fixed case outer support groove 11b with a circular ring shape with upper and outer sides open and , provided below the lower fixed case inner support groove (11a) and provided with a circular ring-shaped fixed case packing groove (11c) communicating with the lower fixed case inner support groove (11a).

The upper fixed case 12 includes a circular tubular upper fixed case tube body portion 12a installed in the lower fixed case outer support groove 11b, and a circular ring-shaped upper fixed case inner seat with the lower and inner sides open. A ring-shaped upper fixed case seating portion 12b having a groove 12b1 and at least one upper fixed case fixed wire insertion hole 12b2 opened up and down and formed inside the upper portion of the upper fixed case tube body 12a ) is equipped with In this embodiment, the upper fixed case fixed wire insertion hole (12b2) is formed outside the upper fixed case inner seating groove (12b1). In addition, in this embodiment, a tubular fixed wire connector C1 made of synthetic rubber is inserted and fixed into the upper fixed case fixed wire insertion hole 12b2.

On the other hand, in the present invention, a separate injection hole (not shown) is provided in the upper fixed case 12 to supply oil into the upper fixed case 12, thereby providing a space between the upper fixed case 12 and the connecting mechanism 50 ( tolerance) can be filled with oil. When the spaced space is filled with oil in this way, when the present invention is used in water, it is possible to prevent external water from flowing into the upper fixed case 12 due to a pressure difference, and to reduce friction when rotating the connection rotating ring 52 . can be reduced

The support ring 13 is installed in the lower fixing case outer support groove 11b.

Meanwhile, in this embodiment, as shown in FIG. 2 , the lower fixed case 11 and the upper fixed case 12 are detachably fixed through a separate fastening member.

As shown in FIGS. 1 to 4 and 6, the rotating case 20 includes a rotating case lower seat body 21, a rotating case tube body 22, and a rotating case upper seat body 23. Thus, it is rotatably installed in the fixed case (10). In this embodiment, the rotating case 20 is preferably made of a non-conductive material.

The rotating case lower seat body 21 is provided with a ring-shaped lubricant accommodating groove 21a that is opened on the outside and the upper side to accommodate the lubricant, and is rotatably installed in the lower fixed case inner support groove 11a. In this embodiment, the lower seat body 21 of the rotating case has a circular ring shape, and a lubricant such as grease is accommodated in the lubricant receiving groove 21a. Meanwhile, in this embodiment, the lower seat body 21 of the rotating case is fastened with the rotating shaft A inserted therein in a keyway fastening method.

The rotating case tube body 22 is installed inside the rotating case lower seat body 21 . In this embodiment, the rotating case tube body 22 has a circular tube shape, and is detachably installed on the rotating case lower seat body 21 via a separate fastening member. On the other hand, in this embodiment, the rotating case tube body 22 is fastened with the rotating shaft (A) inserted therein in a keyway fastening method.

The rotating case upper seat 23 is provided with at least one rotating case rotating wire insertion hole 23a opened up and down, and a ring-shaped rotating case packing groove 23b opened upward, It is formed on the upper side of the tube body 22, and is rotatably installed in the upper fixing case inner seating groove (12b1). A tubular rotary wire connector C2 made of synthetic rubber is inserted and fixed in the rotary case rotary wire insertion hole 23a.

1 to 6, the first packing body 31 is provided with a ring-shaped first ring groove 31a and is installed in the fixed case packing groove 11c; A first O-ring 32 installed in the first ring groove 31a of the first packing body 31 is provided. In this embodiment, the first packing 30 is preferably made of a polymer material.

As shown in FIGS. 1 to 6, the second packing 40 includes a second packing body 41 having a ring-shaped second ring groove 41a and installed in the rotating case packing groove 23b; A second O-ring 42 installed in the second ring groove 41a of the second packing body 41 is provided. In this embodiment, the second packing 40 is preferably made of a polymer material.

The connection mechanism 50 is, as shown in FIGS. 1 to 4 and FIGS. 6 to 7 , a connection fixing ring 51 , a connection rotation ring 52 , an iron plate ring 53 , and a magnet ( 54) is equipped.

The connection fixing ring 51 is, as shown in FIGS. 2 and 7, a circular ring-shaped connection rotating ring insertion groove (51a) having an upper side and an inner opening, and a connection rotating ring insertion groove (51a) opening downward ( The iron plate ring insertion groove (51b) formed below the 51a) and the connection rotation ring insertion groove (51a) are located outside and open up and down, and are fixed through the upper fixing case fixing wire insertion hole (12b2) At least one connection fixing ring fixed wire insertion hole 51c into which the electric wire L1 is inserted (fixed by sputter welding in this embodiment) is provided. In this embodiment, the connection fixing ring 51 has a circular ring shape made of a copper alloy material, so that electricity can be conducted.

The connection rotating ring 52, as shown in FIGS. 2 and 7, has a magnet insertion groove 52a that is opened downward, and is opened up and down to be located inward than the magnet insertion groove 52b. At least one connecting rotating ring rotating wire insertion hole 52b into which the rotating wire L2 passing through the rotating case rotating electric wire insertion hole 23a is inserted (fixed by sputter welding in this embodiment) Thus, it is rotatably installed in the connection rotation ring insertion groove (51a) of the connection fixing ring (51), the rotation case tube body (22) is inserted and fastened. In this embodiment, the connection rotary ring 53 is made of a circular ring shape made of a copper alloy material, so that electricity can be supplied. On the other hand, in the present embodiment, the connection rotating ring 52 is fastened to the rotating case tube body 22 in a keyway fastening method.

The iron plate ring 53 is installed in the iron plate ring insertion groove 51b. In this embodiment, the iron plate ring 53 forms a circular ring shape containing an iron component.

The magnet 54 is installed in the magnet groove insertion groove 52a to pull the iron plate ring 53 . In this embodiment, the magnet 54 is made of a disk-shaped permanent magnet or a disk-shaped conductive magnet capable of conducting electricity, and a plurality of magnets are provided. In addition, in this embodiment, the magnet 54 is preferably provided with a slightly larger depth than the magnet groove insertion groove (52a). And, as the magnet 54 in this embodiment, any one of an alico magnet, a neodium magnet, and a samarium magnet can be selected and used. Meanwhile, in this embodiment, the magnet 54 is fixedly installed in the magnet groove insertion groove 52a in various ways such as bonding.

At least one of the connection mechanisms 50 is stacked between the fixed case 10 and the rotating case 20 so that at least one is positioned on the same line vertically, and the connection mechanism 50 located at the uppermost position is fixed. The ring fixed wire inserting hole 51c and the connecting rotating ring rotating wire inserting hole 52b communicate with the upper fixed case fixed electric wire inserting hole 12b2 and the rotating case rotating wire inserting hole 23a, respectively, and electricity is applied.

As shown in FIGS. 2 and 6, the insulating ring 60 has at least one communication hole 61 that is opened up and down and communicates with the connection fixing ring fixed wire insertion hole 51c, and is opened up and down. The rotating case tube body 22 is inserted and provided with an insertion hole 62 communicating with the connection rotating ring rotating wire insertion hole 52b, and installed between the connection mechanism 50 and the connection mechanism 50 . In this embodiment, the insulating ring 60 is made of various materials if equipped with an insulating function. In addition, in this embodiment, at least one insulating ring 60 is provided. And in this embodiment, the insulating ring 60 is preferably fixedly installed inside the upper fixed case tube body portion 12a by a fixing method such as bonding.

On the other hand, in the present invention, the fixed wire (L1) and the rotating wire (L2) may be an electric wire or a communication wire.

8 is a view for explaining the operation of the present invention, the operation of the present invention will be described with reference to FIG. 8 as follows.

First, a brief look at the assembly process of some components according to the connection of the fixed wire (L1) and the connection fixing ring 51 and the connection of the rotation wire (L2) and the connection rotation ring 52 in the present invention is as follows.

In the present invention, six connection mechanisms 50 are provided.

At this time, the fixed wire L1 connected to the connection fixing ring 51 of the connection mechanism 50 located at the uppermost part passes through the upper fixed case fixed wire insertion hole 12b2 and is drawn out, and is located at the uppermost part The rotary wire L2 connected to the connection rotary ring 52 of the connecting mechanism 50 is drawn out through the rotary case rotary wire insertion hole 23a.

In addition, the fixed wire (L1) connected to the connection fixing ring 51 of the remaining connection mechanism 50, after passing through the communication hole 61 of the insulating ring 60 located in the vertically upward position, located in the vertically upward It passes through the upper fixed case fixed wire insertion hole (12b2) and is withdrawn to the outside.

Then, the rotating wire (L2) connected to the connection rotating ring 52 of the remaining connection mechanism 50, after passing through the insertion hole 62 of the insulating ring 60 located in the vertically upward position, located in the vertically upward It is drawn out through the rotating case rotating wire insertion hole 23a.

When a plurality of fixed electric wires (L1) and rotating electric wires (L2) are installed in this way, electricity from the fixed electric wires (L1) passes through the connection mechanism 50 and then through the rotating electric wires (L2) through the rotating electric equipment is authorized to

On the other hand, in the state in which the present invention is assembled with the fixed wire L1 and the rotary wire L2 electrically connected as described above, the rotary shaft A fastened to the rotary case lower seat body 21 and the rotary case tube body 22 , when the rotating nozzle (for example) rotates, the rotating case 20 rotates along the rotating shaft (A).

At this time, the connection rotating ring 52 rotates together with the rotating case 20, and as shown in FIG. 8 along the connection rotating ring 52, the rotating wire L2 rotates.

Here, the friction between the rotating case lower seat body 21 and the connection fixing ring 51 is reduced by the lubricant accommodated in the lubricant receiving groove 21a of the rotating case 20, thereby increasing wear due to the friction and generating friction powder. can be reduced

In addition, when the connection rotation ring 52 rotates, the connection rotation ring 52 and the connection fixing ring 51 are in close contact with the iron plate ring 53 and the magnet 54, and the connection rotation ring 52 and the connection fixing ring ( 51) is in close contact with the connection rotating ring 52 is rotated.

As described above, the present invention can stably maintain the flow of electricity from the fixed electric wire L1 to the rotating electric wire L2 even in a state in which the rotating shaft A rotates, thereby stably supplying electric power to the rotating electric device.

In the present invention as described above, while the connection fixing ring 51 and the connection rotation ring 52 are in close contact, the connection rotation ring 52 rotates, and through the connection fixing ring 51 and the connection rotation ring 52 . It has the advantage of stably driving electronic devices without generating noise (a state in which it is difficult to supply power smoothly and transmit signals to electronic devices) because electricity is stably energized.

In addition, the present invention has the advantage of extending the service life by minimizing friction generated by the rotation of the connection rotating ring 52 through the lubricant accommodated in the lubricant receiving groove 21a of the rotating case 20. .

In addition, according to the present invention, the first and second packings 30 and 40 are installed at the contact portion between the fixed case 10 and the rotating case 20 , and the waterproofing efficiency is improved.

In addition, in the present invention, when a plurality of connection devices 50 are used, a plurality of fixed wires ( L1) and the rotating wire (L2) can be conveniently installed.

10: fixed case 11: lower fixed case
12: upper fixed case 13: support ring
20: rotating case 21: rotating case lower seat body
22: rotating case tube body 23: rotating case upper seat body
30: first packing 31: first packing body
32: first O-ring 40: second packing
41: second packing body 42: second O-ring
50: connection mechanism 51: connection fixing ring
52: connection rotation ring 60: insulation ring

Claims (4)

a lower fixed case having an inner support groove in the lower fixed case of a circular ring shape having an upper side and an inner opening; A circular tube-shaped upper fixed case tube body, a circular ring-shaped upper fixed case inner seating groove with open lower and inner sides, and an upper fixed case fixed wire insertion hole formed outside the upper fixed case seating groove to open up and down a fixed case comprising; an upper fixed case having a ring-shaped upper fixed case seating portion formed inside the upper portion of the upper fixed case tube body;
a lower seat body in a circular ring shape that is rotatably installed in the inner support groove of the lower fixed case; Rotating case tubular body of a circular tubular shape installed inside the rotating case lower seat body; It has a rotating case rotating wire insertion hole that is opened up and down, is formed on the upper side of the rotating case tube body, and is rotatably installed in the upper fixed case inner seat groove. And the rotating case is installed to
A circular ring-shaped connection ring insertion groove with upper and inner sides open, an iron plate ring insertion groove that is opened downward and formed below the connection rotation ring insertion groove, and is located outside the connection rotation ring insertion groove and opens up and down Connection fixing ring of a circular ring shape having a fixed wire insertion hole formed so as to be formed, the connection fixing ring through which the fixed wire passing through the upper fixing case fixed wire insertion hole is inserted; It has a magnet insertion groove that is opened downward, and a connection rotating ring rotating wire insertion hole that is opened up and down and is formed to open up and down to be located inside the magnet insertion groove, and into which the rotating wire passing through the rotating case rotating wire insertion hole is inserted. to be rotatably installed in the connection rotation ring insertion groove of the connection fixing ring, the connection rotation ring of a circular ring shape to which the rotation case tube body is inserted and fastened; a circular ring-shaped iron plate ring installed in the iron plate ring insertion groove; A connection mechanism consisting of a magnet installed in the magnet groove insertion groove and pulling the iron plate ring;
A hollow slip ring mechanism comprising a.
According to claim 1,
At least two or more upper fixed case fixed wire insertion holes of the upper fixed case seating part are provided,
The rotating case rotating wire insertion hole of the rotating case upper seat body is provided with at least two or more,
The connection mechanism, at least two or more are stacked between the fixed case and the rotating case so that they are located on the same line up and down, and the connection fixing ring fixed wire insertion hole and the connection rotation ring rotation wire insertion hole of the connection mechanism located at the uppermost part The upper fixed case fixed wire insertion hole and the rotating case rotary wire insertion hole are respectively connected to each other to conduct electricity,
At least two or more communication holes that are opened up and down to communicate with the connection fixing ring fixed wire insertion hole, and an insertion hole that is opened up and down to insert the rotating case body and communicate with the connection rotating ring rotating wire insertion hole, (50) Hollow slip ring mechanism, characterized in that it further comprises a ring-shaped insulating ring installed between the connection mechanism.
3. The method of claim 1 or 2,
The lower seat of the rotating case is a hollow slip ring mechanism, characterized in that the upper side is opened and provided with a lubricant receiving groove in the shape of a ring in which the lubricant is accommodated.
3. The method of claim 1 or 2,
A ring-shaped first packing is provided between the lower fixed case and the lower seat of the rotating case,
A hollow slip ring mechanism, characterized in that a ring-shaped second packing is provided between the upper fixed case seat part and the rotating case upper seat body.

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