CN221126624U

CN221126624U - Novel low noise DTU looped netowrk cabinet

Info

Publication number: CN221126624U
Application number: CN202322864852.2U
Authority: CN
Inventors: 胡玲; 王江波; 文新
Original assignee: Hunan Tianwei Electric Co ltd
Current assignee: Hunan Tianwei Electric Co ltd
Priority date: 2023-10-25
Filing date: 2023-10-25
Publication date: 2024-06-11
Anticipated expiration: 2033-10-25

Abstract

The utility model discloses a novel low-noise DTU ring main unit, which comprises a cabinet box and a cabinet door assembled on the front side of the cabinet box, wherein the inner wall of the cabinet box and the inner wall of the cabinet door are respectively coated with a sound absorbing component, and the cabinet box is divided into an upper-layer installation cavity and a lower-layer assembly cavity by a partition plate, and further comprises a heat radiating component assembled in the cabinet box. In the sound-absorbing assembly, the sound-absorbing sponge is adhered to the inner walls of the cabinet and the cabinet door, the outer wrapping plate is wrapped on the inner side of the sound-absorbing sponge, and sound-absorbing small holes are formed in the outer wrapping plate. In the heat radiation assembly, the air supply pump is arranged in the assembly cavity, the air distribution disc is fixed at the top of the assembly cavity, the air exhaust pipeline is communicated with the air supply pump and the air distribution plate, and the air inlet pipeline is communicated with the air supply pump and the external environment of the cabinet. The utility model can effectively reduce the outward transmission of noise generated by the operation of the DTU ring main unit, rapidly discharge the heat accumulated in the DTU ring main unit, avoid the hardening and deterioration of the sound absorbing component and ensure the design requirement of maintaining low noise for a long time of the DTU ring main unit.

Description

Novel low noise DTU looped netowrk cabinet

Technical Field

The utility model relates to the technical field of ring main units, in particular to a novel low-noise DTU ring main unit.

Background

The DTU ring main unit, i.e. a distribution transformer unit, is a common device in a power system, and is generally called Distribution Transformer Unit, and is generally used in a power distribution system to convert high-voltage electric energy into low-voltage electric energy for users to use.

The ring main unit can produce the reason of noise when the during operation has following several aspects:

(1) The ring main unit internally comprises parts such as an iron core and a winding of a transformer, and unavoidable mechanical vibration can be generated during working, so that noise is generated.

(2) The fan, radiator and other devices inside the ring main unit can generate air flow noise during operation.

(3) The electric equipment in the ring main unit can generate an electromagnetic field during operation, thereby generating electromagnetic noise.

(4) Noise may be generated if components of the ring main unit age or fail, such as loose connectors, worn bearings, etc.

In a word, the production of noise is normal phenomenon when looped netowrk cabinet operation, in order to avoid the noise transmission outward that the looped netowrk cabinet operation produced, influence surrounding environment quality, avoid causing the influence to surrounding crowd, resident's living environment, activity environment, need design a novel low noise DTU looped netowrk cabinet.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model aims to provide the novel low-noise DTU ring main unit, which can effectively reduce outward transmission of noise generated by the operation of the DTU ring main unit, quickly discharge heat accumulated in the DTU ring main unit, avoid hardening and deterioration of a sound absorbing component and ensure the design requirement of maintaining low noise of the DTU ring main unit for a long time.

The technical scheme adopted by the utility model for achieving the purpose is as follows: the novel low-noise DTU ring main unit comprises a cabinet box and a cabinet door assembled on the front side of the cabinet box, wherein the inner wall of the cabinet box and the inner wall of the cabinet door are both coated with sound absorbing components, a partition plate is fixedly connected to the bottom of the cabinet box, the partition plate divides the cabinet box into an upper-layer installation cavity and a lower-layer assembly cavity, and the novel low-noise DTU ring main unit further comprises a heat radiating component assembled in the cabinet box; the sound absorbing assembly comprises a sound absorbing sponge and an outer wrapping plate, wherein the sound absorbing sponge is adhered to the inner walls of the cabinet box and the cabinet door, the outer wrapping plate is wrapped on the inner side of the sound absorbing sponge, and sound absorbing holes are uniformly formed in the outer wrapping plate; the heat dissipation assembly comprises an air supply pump, an air inlet pipeline, an air exhaust pipeline and an air distribution plate, wherein vent holes are formed in the partition plate, the air supply pump is fixedly installed in the assembly cavity, the air distribution plate is fixed at the top of the installation cavity, air outlets which are vertically and downwardly arranged are uniformly formed in the air distribution plate, the air exhaust pipeline is communicated with the air supply pump and the air distribution plate, and the air inlet pipeline is communicated with the air supply pump and the external environment of the cabinet.

In some implementations, in order to ensure that various related power equipment can be stably assembled in the installation cavity of the cabinet, the power equipment is ensured to be smoothly assembled, and circuit connection and wiring are facilitated, so that the following technical scheme is provided.

The inner wall both sides of installation chamber all fixedly connected with multilayer installation pterygoid lamina, the installation pterygoid lamina is fixed through the first bolt that runs through the installation pterygoid lamina and arrange and transversely connect to the cabinet railway carriage or compartment inner wall soon, and fixed mounting has the assembly frame plate on two sets of installation pterygoid lamina of same level, the assembly frame plate both ends are through running through the assembly frame plate and arrange and vertically connect to the second bolt on the installation pterygoid lamina soon and fix.

In some implementations, when the air supply pump operates, in order to ensure that natural air outside the cabinet can enter the air inlet pipeline through the wall of the cabinet, the air for heat exchange and temperature rise can be discharged outside the cabinet outside the assembly cavity, and the following technical scheme is provided.

The cabinet side wall is provided with an air inlet through hole communicated with the assembly cavity, the end part of the air inlet pipeline is in sealing connection with the air inlet through hole, and the rear wall of the cabinet is provided with an air exhaust through hole communicated with the assembly cavity.

In some implementations, in order to ensure that one end of the air inlet pipeline can be effectively connected with the air inlet through holes, the air inlet pipeline and the air inlet through holes on two sides are guaranteed to be in sealed connection, and meanwhile dust in the external environment is prevented from entering the cabinet from the air inlet through holes and the air exhaust through holes, so that the normal operation of the heat dissipation assembly and related power equipment is influenced.

The air inlet pipeline comprises an air inlet main pipe and an air inlet branch pipe, two ends of the air inlet main pipe are respectively communicated with the air inlet branch pipe and the air supply pump, the end part of the air inlet branch pipe is fixedly connected with a flaring pipe, the flaring pipe is in sealing connection with the air inlet through hole, and dustproof net plates are assembled at the air inlet through hole and the air exhaust through hole.

In some implementations, in order to facilitate the movement of the control cabinet and the power equipment assembled in the control cabinet, the control cabinet can be stably supported to ensure the stable operation of the internal power equipment.

The universal wheels and the supporting components are assembled at corners of the bottom of the cabinet, the supporting components comprise mounting sleeves, telescopic sleeves, supporting foot pads and threaded rods, the mounting sleeves are fixed to the bottom of the cabinet, the telescopic sleeves are slidably mounted in the mounting sleeves, the supporting foot pads are fixedly connected to the bottoms of the telescopic sleeves and are arranged on the outer sides of the mounting sleeves, and the threaded rods are rotatably mounted at the axes of the mounting sleeves and are in rotary connection with the telescopic sleeves.

The utility model has the beneficial effects that: the noise absorbing assembly can block the way of outwards transmitting the noise generated by the operation of each power equipment and the heat radiating assembly assembled in the cabinet, so that the noise generated by the operation of the DTU ring main unit is reduced, the support foot pad can prevent the vibration generated by the operation of the DTU ring main unit from being transmitted to the ground, and the noise vibration generated by the operation of the ring main unit is further reduced. The outer cover plate of the sound absorbing assembly can enable the inner walls of the installation cavity and the assembly cavity to be in a flat gesture, and is matched with the installation wing plate and the assembly frame plate, so that relevant power equipment can be stably installed in the sound absorbing assembly, and the installation flatness and wiring uniformity of the power equipment are guaranteed. The setting of radiator unit can guarantee to arrange the heat that power equipment operation produced outside fast, avoids the heat to pile up in the installation cavity and leads to inhaling the sound sponge and be heated the hardening, influences the sound effect of inhaling the sound sponge.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of another view of the present utility model;

fig. 3 is a schematic structural view of a sound absorbing assembly;

FIG. 4 is a schematic view of the structure of a cabinet door;

fig. 5 is a schematic view of the structure of the mounting wing plate and the mounting frame plate for mating mounting;

FIG. 6 is a schematic diagram of a heat dissipating assembly;

FIG. 7 is a schematic view of the support assembly in a cut-away state;

Fig. 8 is a schematic structural view of the cabinet.

In the figure: 1 cabinet, 11 baffle, 111 ventilation holes, 12 installation cavity, 13 assembly cavity, 14 installation wing plate, 141 first bolt, 15 assembly wing plate, 151 second bolt, 152 circular through hole, 153 bar through hole, 16 air inlet through hole, 17 air outlet through hole, 18 dustproof screen, 2 cabinet door, 21 spacing, 22 observation window, 23 handles, 3 sound absorbing component, 31 sound absorbing sponge, 32 outer package plate, 321 sound absorbing small hole, 41 air supply pump, 421 air inlet main pipe, 422 air inlet branch pipe, 423 flaring pipe, 43 air outlet pipeline, 44 air distribution plate, 441 air outlet, 5 universal wheel, 6 support component, 61 installation sleeve, 611 guide strip, 62 telescopic sleeve, 621 guide slot, 63 support foot pad, 64 threaded rod, 641 spacing seat, 642 hand wheel.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-8, a novel low-noise DTU ring main unit comprises a cabinet body 1, a cabinet door 2 assembled on the front side of the cabinet body 1, sound absorbing components 3 respectively coated on the inner wall of the cabinet body 1 and the inner wall of the cabinet door 2, a partition board 11 fixedly connected to the bottom of the cabinet body 1, and the partition board 11 dividing the cabinet body 1 into an upper mounting cavity 12 and a lower assembling cavity 13, and a heat dissipation component assembled in the cabinet body 1; the sound absorbing assembly 3 comprises a sound absorbing sponge 31 and an outer wrapping plate 32, wherein the sound absorbing sponge 31 is adhered to the inner walls of the cabinet body 1 and the cabinet door 2, the outer wrapping plate 32 is wrapped on the inner side of the sound absorbing sponge 31, and sound absorbing small holes 321 are uniformly formed in the outer wrapping plate 32.

The heat radiation assembly comprises an air supply pump 41, an air inlet pipeline, an air exhaust pipeline 43 and an air distribution plate 44, wherein the partition plate 11 is provided with vent holes, the air supply pump 41 is fixedly arranged in the assembly cavity 13, the air distribution plate is fixed at the top of the installation cavity 12, the air distribution plate 44 is uniformly provided with air outlets 441 which are vertically and downwards arranged, the air exhaust pipeline 43 is communicated with the air supply pump 41 and the air distribution plate 44, and the air inlet pipeline is communicated with the air supply pump 41 and the external environment of the cabinet 1.

The installation cavity 12 in the cabinet 1 is used for assembling related power equipment for realizing the functions of ring main unit transformation, power distribution and the like, and the assembly cavity 13 is used for assembling related components and other auxiliary components in the heat dissipation assembly, so that noise generated during operation of the air supply pump 41 in the heat dissipation assembly is avoided from leaking, and noise generated by collision between the inner walls of the air inlet pipeline and the air exhaust pipeline 43 and air is transmitted outwards, and therefore the sound absorption assembly 3 is assembled on the inner walls of the installation cavity 12 and the assembly cavity 13.

For the sound absorbing assembly 3, the sound absorbing sponge 31 can ensure that the noise generated by the operation of the related power equipment, the air supply pump 41, the air inlet pipeline and the air exhaust pipeline 43 is effectively absorbed so as to meet the design requirement of the ring main unit for low-noise operation, the inner cladding of the outer cladding plate 32 can improve the flatness of the inner walls of the assembly cavity 13 and the installation cavity 12, and meanwhile, the sound absorbing small holes 321 formed in the inner cladding plate can ensure that the generated noise is transmitted to the sound absorbing sponge 31.

For cabinet door 2, it includes two sets of bilateral symmetry's that arrange, and all assembles in the opening part of cabinet railway carriage or compartment 1 front side with articulated mode, and wherein the lateral wall of a set of cabinet door 2 still is equipped with spacing 21 to guarantee that two sets of cabinet doors 2 can effectively laminate under the closed condition. In order to observe the real-time data of the electric power detection equipment such as the ammeter in the installation cavity 12 from the closed cabinet door 2 conveniently, an observation window 22 is further formed in the cabinet door 2, sound insulation glass is assembled on the observation window 22, and correspondingly, a gap matched with the observation window 22 is formed in the sound absorption assembly 3 assembled in the process.

The handle 23 with a locking component is also arranged on the outer side of the cabinet door 2, so that the cabinet door 2 can be conveniently controlled to be opened and closed.

When the relevant power equipment assembled in the installation cavity 12 is subjected to heat dissipation, the air supply pump 41 works to convey natural air outside the cabinet 1 to the air distribution plate 44 along the air inlet pipeline and the air exhaust pipeline 43, and then the natural air is blown out from the top of the installation cavity 12 vertically downwards through the air outlet 441 formed in the air distribution plate 44, so that the relevant power equipment assembled in the installation cavity 12 is subjected to effective heat dissipation, the natural air temperature after heat exchange is increased, and then the natural air enters the assembly cavity 13 through the vent hole in the partition plate 11, and then the air is discharged outside from the rear of the assembly cavity 13, so that the air is ensured to be circulated freely while the stable heat dissipation of the relevant power equipment is realized.

The heat dissipation subassembly operation can avoid the heat to pile up in installation cavity 12, avoids inhaling sound sponge 31 and is heated the hardening, influences the long-term sound absorbing effect of inhaling sound sponge 31, promotes the low noise function of DTU looped netowrk cabinet.

In order to ensure that various related power equipment can be stably assembled in the installation cavity 12 of the cabinet body 1, ensure that the power equipment is smoothly assembled, and facilitate circuit connection and wiring, the following technical scheme is provided.

The inner wall both sides of installation cavity 12 all fixedly connected with multilayer installation pterygoid lamina 14, and installation pterygoid lamina 14 is fixed through running through installation pterygoid lamina 14 and transversely connect soon to the first bolt 141 of cabinet railway carriage or compartment 1 inner wall, and fixed assembly has the assembly frame board on two sets of installation pterygoid lamina 14 of same level, and the assembly frame board both ends are fixed through running through the arrangement of assembly frame board and the second bolt 151 that vertically connects soon to on the installation pterygoid lamina 14.

The arrangement of the mounting wing plates 14 can ensure that the mounting frame plate is stably mounted on the mounting frame plate, the mounting frame plate is mounted on each layer of the mounting wing plates 14 and different positions of the mounting wing plates 14 through actual use requirements, and related electric equipment is mounted on the mounting frame plate through fixing bolts.

In order to ensure effective heat dissipation of the power equipment installed on each layer of the assembly frame plate, and simultaneously ensure stable installation of the power equipment on the assembly frame plate, a running through hole for penetrating through the fixing bolt is formed in the assembly frame plate, and a strip-shaped through hole 153 for ensuring free passage of cold air is formed in the assembly frame plate.

To ensure a stable assembly of the mounting flap 14 on the inner wall of the mounting cavity 12, the suction assembly is provided with a notch at this assembly location.

When the air supply pump 41 is operated, in order to ensure that natural air outside the cabinet compartment 1 can enter the air inlet pipeline through the wall of the cabinet compartment 1, the air for ensuring heat exchange and temperature rise can be discharged outside the cabinet compartment 1 outside the assembly cavity 13, and the following technical scheme is provided.

The side wall of the cabinet body 1 is provided with an air inlet through hole 16 communicated with the assembly cavity 13, the end part of the air inlet pipeline is in sealing connection with the air inlet through hole 16, and the rear wall of the cabinet body 1 is provided with an air exhaust through hole 17 communicated with the assembly cavity 13.

When the air supply pump 41 acts, external natural air can be input into an air inlet pipeline from the air inlet through hole 16, then the air is conveyed to the air distribution plate 44 from the air exhaust pipeline 43 under the action of the air supply pump 41, cold air blown downwards by the air distribution plate 44 passes through the electric equipment assembled on each layer, and after the electric equipment is subjected to heat exchange and temperature reduction, the cold air enters the assembly cavity 13 through the vent hole formed in the partition plate 11, and then is discharged from the air exhaust through hole 17.

Corresponding sound absorbing assembly 3 is also provided with notches at the air inlet through hole 16 and the air outlet through hole 17.

In order to ensure that one end of the air inlet pipeline can be effectively connected with the air inlet through holes 16, the air inlet pipeline and the air inlet through holes 16 on two sides are in sealed connection, and meanwhile, dust in the external environment is prevented from entering the cabinet 1 from the air inlet through holes 16 and the air outlet through holes 17, so that the normal operation of the heat dissipation assembly and related power equipment is influenced.

The air inlet pipeline comprises an air inlet main pipe 421 and an air inlet branch pipe 422, two ends of the air inlet main pipe 421 are respectively communicated with the air inlet branch pipe 422 and the air supply pump 41, a flaring pipe 423 is fixedly connected to the end part of the air inlet branch pipe 422, the flaring pipe 423 is in sealing connection with the air inlet through hole 16, and the positions of the air inlet through hole 16 and the air exhaust through hole 17 are provided with dust-proof net plates 18.

When the air supply pump 41 works, air in the external environment enters the flaring pipes 423 through the air inlet through holes 16, and is collected to the air inlet main pipe 421 along the air inlet branch pipes 422, and dust in the external environment can be effectively intercepted by the dust screen 18.

For convenient control cabinet case 1 and the power equipment who assembles in cabinet case 1 remove, can guarantee cabinet case 1 steady support simultaneously to guarantee the steady operation of inside power equipment, provide following technical scheme to this.

The universal wheels 5 and the supporting components 6 are assembled at corners of the bottom of the cabinet body 1, the supporting components 6 comprise a mounting sleeve 61, a telescopic sleeve 62, supporting foot pads 63 and threaded rods 64, the mounting sleeve 61 is used for fixing the bottom of the cabinet body 1, the telescopic sleeve 62 is slidably mounted in the mounting sleeve 61, the supporting foot pads 63 are fixedly connected to the bottom of the telescopic sleeve 62 and are arranged on the outer side of the mounting sleeve 61, and the threaded rods 64 are rotatably mounted at the axle center of the mounting sleeve 61 and are in rotary connection with the telescopic sleeve 62.

Guide strips 611 are fixedly connected to the inner wall of the mounting sleeve 61, guide grooves 621 which are slidably connected with the guide strips 611 are formed in the outer wall of the telescopic sleeve 62, so that the mounting sleeve 61 and the telescopic sleeve 62 are slidably combined, the threaded rod 64 is rotatably connected with the top of the telescopic sleeve 62, a limiting seat 641 is fixedly connected to the bottom of the threaded rod 64, and the telescopic sleeve 62 can be prevented from being separated from the threaded rod 64 by the aid of the limiting seat 641.

The top end of the threaded rod 64 is fixedly connected with a hand wheel 642 arranged on the inner side of the assembly cavity 13, the threaded rod 64 is driven to rotate by operating the hand wheel 642, the telescopic sleeve 62 is driven to extend downwards, the support foot pad 63 assembled on the bottom of the telescopic sleeve 62 is supported stably by the support foot pad 63 and the horizontal ground, and stable assembly of the cabinet 1 and stable operation of power equipment and heat dissipation components inside the cabinet 1 can be ensured.

After the control threaded rod 64 rotates reversely to retract the telescopic sleeve 62 to the mounting sleeve 61, the supporting foot pad 63 is higher than the universal wheel 5, and at the moment, the universal wheel 5 is in contact with the ground, so that the control cabinet compartment 1 is convenient to move.

The support foot pad 63 is formed by processing rubber materials, so that vibration generated by the operation of the DTU ring main unit can be prevented from being transmitted to the ground, and noise vibration generated by the operation of the ring main unit is further reduced.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. Novel low noise DTU looped netowrk cabinet, its characterized in that: the novel cabinet comprises a cabinet body (1) and a cabinet door (2) assembled on the front side of the cabinet body (1), wherein the inner wall of the cabinet body (1) and the inner wall of the cabinet door (2) are both coated with a sound absorbing component (3), a partition board (11) is fixedly connected to the bottom of the cabinet body (1), the partition board (11) divides the cabinet body (1) into an upper-layer installation cavity (12) and a lower-layer assembly cavity (13), and the novel cabinet also comprises a heat radiating component assembled in the cabinet body (1); the sound absorbing assembly (3) comprises a sound absorbing sponge (31) and an outer wrapping plate (32), wherein the sound absorbing sponge (31) is adhered to the inner walls of the cabinet (1) and the cabinet door (2), the outer wrapping plate (32) is wrapped on the inner side of the sound absorbing sponge (31), and sound absorbing small holes (321) are uniformly formed in the outer wrapping plate (32); the heat dissipation assembly comprises an air supply pump (41), an air inlet pipeline, an air exhaust pipeline (43) and an air distribution plate (44), wherein vent holes are formed in the partition plate (11), the air supply pump (41) is fixedly installed in the assembly cavity (13), the air distribution plate is fixed at the top of the installation cavity (12), air outlets (441) which are vertically and downwardly arranged are uniformly formed in the air distribution plate (44), the air exhaust pipeline (43) is communicated with the air supply pump (41) and the air distribution plate (44), and the air inlet pipeline is communicated with the air supply pump (41) and the external environment of the cabinet (1).

2. The novel low noise DTU ring main unit as recited in claim 1, wherein: the multi-layer installation wing plates (14) are fixedly connected to two sides of the inner wall of the installation cavity (12), the installation wing plates (14) are fixed through first bolts (141) penetrating through the installation wing plates (14) to be arranged and transversely screwed to the inner wall of the cabinet (1), assembly frame plates are fixedly assembled on two groups of installation wing plates (14) with the same horizontal height, and two ends of each assembly frame plate are fixed through second bolts (151) penetrating through the assembly frame plates to be arranged and longitudinally screwed to the installation wing plates (14).

3. The novel low noise DTU ring main unit as recited in claim 1, wherein: the side wall of the cabinet (1) is provided with an air inlet through hole (16) communicated with the assembly cavity (13), the end part of the air inlet pipeline is in sealing connection with the air inlet through hole (16), and the rear wall of the cabinet (1) is provided with an air exhaust through hole (17) communicated with the assembly cavity (13).

4. A novel low noise DTU ring main unit as claimed in claim 3, wherein: the air inlet pipeline comprises an air inlet main pipe (421) and an air inlet branch pipe (422), two ends of the air inlet main pipe (421) are respectively communicated with the air inlet branch pipe (422) and an air supply pump (41), a flaring pipe (423) is fixedly connected to the end part of the air inlet branch pipe (422), the flaring pipe (423) is in sealing connection with the air inlet through hole (16), and dustproof screen plates (18) are assembled at the positions of the air inlet through hole (16) and the air exhaust through hole (17).

5. The novel low noise DTU ring main unit as recited in claim 1, wherein: the utility model discloses a cabinet, including cabinet (1) bottom corner, support subassembly (6) are equipped with universal wheel (5), support subassembly (6) including installation sleeve (61), telescopic sleeve (62), support callus on the sole (63), threaded rod (64), installation sleeve (61) are fixed cabinet (1) bottom, telescopic sleeve (62) slidable mounting is in installation sleeve (61), support callus on the sole (63) rigid coupling to telescopic sleeve (62) bottom and arrange in installation sleeve (61) outside, threaded rod (64) rotate install in installation sleeve (61) axle center department and keep the spin with telescopic sleeve (62).