CN217843075U

CN217843075U - Double-channel rotary joint

Info

Publication number: CN217843075U
Application number: CN202221578553.1U
Authority: CN
Inventors: 赵永刚; 袁良恒
Original assignee: Henan Haorui Intelligent Technology Co ltd
Current assignee: Henan Haorui Intelligent Technology Co ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-11-18
Anticipated expiration: 2032-06-23

Abstract

Two-way rotary joint, including right angle type coupling, rotary pipe connects, the flange end cover, sealed spacer sleeve and sealed clamping ring, right angle type coupling includes vertical pipe and horizontal pipe, the horizontal pipe sets up along the fore-and-aft direction level, the upper end fixed connection of vertical pipe is on the preceding tip downside pipe wall of horizontal pipe, rotary pipe connects the concentric rotation of installing in horizontal pipe, flange end cover fixed mounting is at the front end of horizontal pipe, interval fixed connection is at the rear end of horizontal pipe around sealed spacer sleeve and the sealed clamping ring, the lower extreme of horizontal pipe and the upper portion delivery port fixed connection of water supply pipe, the rear end of rotary pipe joint and the one end fixed connection of arm pipeline, all lay on the outer pipe wall of water supply pipe and arm pipeline and be connected with the hydraulic control pipeline, rotary pipe connects, the horizontal pipe, be equipped with the hydraulic pressure passageway that feeds through two hydraulic control pipelines on sealed spacer sleeve and the vertical pipe. The utility model relates to a science can make water supply pipe and belt cleaning device and two adjacent hydraulic control pipelines remain the intercommunication throughout.

Description

Double-channel rotary joint

Technical Field

The utility model relates to a condenser cleaning equipment technical field, specific theory relates to a bi-pass rotary joint.

Background

The condenser is an important component of a cold end device of a modern thermal power plant, and has the main function of quickly condensing steam which applies work to a turbine into water, so that a steam outlet of the turbine is established and kept at a certain vacuum degree, and the power generation efficiency is improved. The safe and economic operation of a power plant unit can be seriously influenced by the over-low vacuum degree of the steam turbine exhaust port, and the important reason for the over-low vacuum degree of the steam turbine exhaust port is scaling of a heat exchange tube of a condenser and dust precipitation in the heat exchange tube. The scale deposit and the dust deposit of condenser can produce serious influence to the heat exchange efficiency of condenser, still can cause condenser pipe corrosion simultaneously, especially is a potential safety hazard, consequently need regularly wash the condenser.

The condenser online cleaning robot is produced by the following steps that a cleaning device needs to move up and down under the driving of a lifting mechanism during cleaning so as to clean all heat exchange tubes on condenser tube plates, when the cleaning device moves up and down, a water supply pipeline is connected with the cleaning device through a mechanical arm pipeline, the water outlet end of the water supply pipeline is connected with one end of the mechanical arm pipeline, the adjacent pipeline connection part of the mechanical arm pipeline and the other end of the mechanical arm pipeline are connected with the water inlet end of the cleaning device through a rotary joint structure, a hydraulic device is usually arranged in the cleaning device and used for enabling a cleaning device to be attached to or separated from the condenser tube plates, a hydraulic control pipeline of the hydraulic device is usually laid outside the water supply pipeline and the mechanical arm pipeline, and if the hydraulic control pipeline is bent excessively at the rotary joint structure, the circulation of hydraulic oil can be influenced, and therefore, a double-channel rotary joint is specially designed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a bi-pass rotary joint, the utility model relates to a science, it is rational in infrastructure, can guarantee that water supply pipe and belt cleaning device and hydraulic control pipeline homoenergetic reciprocate and remain the intercommunication throughout along with belt cleaning device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the double-channel rotary joint is used for connecting the water outlet end of a water supply pipeline and one end of a mechanical arm pipeline, the other end of the mechanical arm pipeline is connected with the water inlet end of a cleaning device, and comprises a right-angle pipe joint, a rotary pipe joint, a flange end cover, a sealing spacer sleeve and a sealing compression ring, wherein the right-angle pipe joint comprises a vertical pipe and a horizontal pipe, the horizontal pipe is horizontally arranged along the front and back direction, the upper end of the vertical pipe is fixedly connected to the lower side pipe wall of the front end part of the horizontal pipe and is communicated with the inside of the horizontal pipe in an integrated mode, the rotary pipe joint is horizontally arranged along the front and back direction and is concentrically and rotatably installed in the horizontal pipe, the front end of the rotary pipe joint is plugged, through holes which are concentric up and down and are communicated with the vertical pipe are formed in the upper side pipe wall and the lower side pipe wall of the front side part of the rotary pipe joint, the flange end cover is fixedly installed at the front end of the horizontal pipe, the sealing spacer sleeve and the sealing compression ring are fixedly connected to the rotary pipe joint at the rear end of the horizontal pipe at intervals, the front end of the sealing compression ring and the rotary pipe joint, the rear end of the sealing compression ring and the sealing spacer sleeve, the lower end of the upper part of the horizontal pipe joint is fixedly connected with the upper end of the water supply pipeline, and the outer pipe joint, and the hydraulic control pipe joint, and the hydraulic control pipe are connected with the hydraulic control pipe joint.

The hydraulic channel comprises an annular groove passage arranged on an inner circle in the middle of a sealing spacer sleeve, a first connecting hole which is vertically communicated with the annular groove passage is formed in the rear side portion of the lower side pipe wall of a horizontal pipe and the middle portion of the lower side pipe wall of the sealing spacer sleeve, a second connecting hole which is communicated with the annular groove passage is formed in the rear side portion of the lower side pipe wall of a rotary pipe joint, an outlet flange is integrally formed in the rear end portion of the rotary pipe joint, a first L-shaped hole is formed in the lower side portion of the outlet flange, one end of the first L-shaped hole is located in the front end face of the outlet flange, the other end of the first L-shaped hole is located in the inner cylindrical face of the outlet flange, an inlet flange is integrally formed at the lower end portion of a vertical pipe, a bent pipe which is located in the rear side of the vertical pipe is fixedly connected between the outer end of the first L-shaped hole and the rear end of the first L-shaped hole, the bent pipe which is fixedly connected with the upper end of the inlet flange, the outlet flange is fixedly connected with the upper end of a mechanical arm, and the lower end of the hydraulic control pipe is connected with the first L-shaped hole.

A first sealing structure is arranged between the front end part of the outer circumference of the rotary pipe joint and the front end part of the inner circumference of the horizontal pipe, and a second sealing structure is arranged between the rear side part of the outer circumference of the rotary pipe joint and the rear end part of the inner circumference of the horizontal pipe.

The first sealing structure comprises a first sealing ring, a first step groove is formed in the inner circle of the front end of the horizontal pipe, the first sealing ring is fixedly embedded in the bottom of the rear side groove of the first step groove and sleeved on the front side portion of the rotary pipe joint, the first sealing ring is connected with the rotary pipe joint in a sliding and sealing mode, a first bearing and a first isolating pipe sleeve which are sleeved on the front side portion of the rotary pipe joint are fixedly embedded in the front side groove of the first step groove from front to back in sequence, a flange end cover is fixedly installed at the front end of the horizontal pipe through a plurality of first fastening screws, a rotating gap is reserved between the rear end face of the flange end cover and the front end of the horizontal pipe, a second O-shaped ring which is tightly contacted with the front end face of the horizontal pipe is fixedly embedded in the rear end edge face of the flange end cover, an annular flange extending into the front side groove of the first step groove is integrally formed in the rear end inner circle of the flange end cover, the outer circle of the annular flange is tightly matched with the inner circle of the front side groove of the first step groove, and the first isolating pipe sleeve is fixedly embedded in a first limiting ring sleeve which is tightly pressed, and the first limiting pipe sleeve is a first shaft.

The second sealing structure comprises a second sealing ring, a second step groove is arranged on the inner circle of the rear end of the horizontal pipe, the second sealing ring is fixedly embedded in the bottom of the front side groove of the second step groove and is sleeved in the middle of the rotary pipe joint, a second isolating pipe sleeve, a second bearing and a third isolating pipe sleeve which are sleeved in the middle of the rotary pipe joint are fixedly embedded in the rear side groove of the second step groove from front to back in sequence, a circular boss is integrally formed on the outer circumference of the rear end part of the sealing spacer sleeve, the front side surface of the circular boss is tightly pressed on the rear end surface of the horizontal pipe, a third O-shaped ring which is tightly pressed with the rear end surface of the horizontal pipe is fixedly embedded on the front side surface of the circular boss, the sealing ring is concentrically sleeved on the rear end part of the rotary pipe joint and is tightly pressed on the rear side surface of the circular boss, and is fixedly connected to the rear end of the horizontal pipe through a plurality of second fastening screws which penetrate through the circular boss, the front side part of the sealing spacer sleeve is embedded in the front side part of the rear side groove of the second step groove, the outer circle of the front side part of the sealing spacer sleeve is in clearance fit with the inner circle of the rear side groove of the second step groove, the inner circle of the front end of the sealing spacer sleeve is provided with a first mounting groove, the inner circle of the rear end of the sealing spacer sleeve is provided with a second mounting groove, the front end of the sealing spacer sleeve tightly presses the third isolation pipe sleeve, the third isolation pipe sleeve tightly presses the rear end face of the outer ring of the second bearing, the front end face of the outer ring of the second bearing tightly presses the second isolation pipe sleeve tightly, the second isolation pipe sleeve tightly presses the second sealing ring, a third sealing ring sleeved on the rear side part of the rotary pipe joint is fixedly embedded in the first mounting groove, a fourth sealing ring sleeved on the rear end part of the rotary pipe joint is fixedly embedded in the second mounting groove, the sealing ring tightly presses the fourth sealing ring, and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are tightly matched with the rotary pipe joint, the seal rotates.

The utility model discloses relative prior art has substantive characteristics and progress, and specifically speaking, the utility model discloses a lower extreme of horizontal pipe and water supply pipe's upper portion outlet end fixed connection, the rear end of swivel coupling and the one end fixed connection of arm pipeline, then reciprocate the in-process at belt cleaning device, the arm pipeline can be swung along with belt cleaning device's reciprocating to guarantee water supply pipe and belt cleaning device intercommunication all the time, and the hydraulic control pipeline on the outer pipe wall of water supply pipe and arm pipeline passes through as two solitary pipelines respectively the utility model provides a hydraulic pressure passageway can remain the intercommunication all the time, compares with a traditional whole hydraulic pressure pipe, can avoid taking place excessive buckling, guarantees that the circulation of hydraulic oil is normal, and each seal member's setting can improve overall sealing nature greatly, the utility model relates to a science, rational in infrastructure can guarantee that water supply pipe and belt cleaning device and two adjacent hydraulic control pipelines all can reciprocate along with belt cleaning device and remain the intercommunication all the time.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The embodiments of the present invention will be further explained with reference to the drawings.

As shown in fig. 1, two-way rotary joint, an end for connecting the water outlet end of water supply pipe and the arm pipeline, the other end of the arm pipeline is connected with the water inlet end of a cleaning device, including right angle type coupling 1, rotary coupling 2, flange end cover 3, sealed spacer 4 and sealed clamping ring 5, right angle type coupling 1 includes vertical pipe and horizontal pipe, the horizontal pipe sets up along the fore-and-aft direction level, the upper end integrated into one piece fixed connection of vertical pipe is on the preceding tip downside pipe wall of horizontal pipe and with the inside intercommunication of horizontal pipe, rotary coupling 2 sets up and rotates concentrically in the horizontal pipe along the fore-and-aft direction level and installs, the front end shutoff of rotary coupling 2, all set up upper and lower concentric and with vertical pipe correspond the through-hole 6 that communicates on the preceding lateral part upside pipe wall of rotary coupling 2 and the downside pipe wall, flange end cover 3 fixed mounting is at the front end of horizontal pipe, sealed spacer 4 and sealed clamping ring 5 around the interval fixed connection at the rear end of horizontal pipe and the concentric suit on rotary coupling 2, sealed clamping ring 5 sticiss the rear end of water supply pipe 4, the lower extreme of horizontal pipe is connected with the hydraulic control pipeline and the hydraulic pressure control pipeline that the mechanical arm is connected with the rotary coupling and the rotary coupling 2, the hydraulic pressure control pipeline.

The hydraulic channel comprises an annular groove passage 7 arranged on an inner circle in the middle of a sealing spacer bush 4, the rear side part of the lower side pipe wall of a horizontal pipe and the middle part of the lower side pipe wall of the sealing spacer bush 4 are respectively provided with a first connecting hole 8 which is communicated with the annular groove passage 7 in an up-and-down corresponding mode, the rear side part of the lower side pipe wall of a rotary pipe joint 2 is provided with a second connecting hole communicated with the annular groove passage 7, the rear end part of the rotary pipe joint 2 is integrally formed with an outlet flange 9, the lower side part of the outlet flange 9 is provided with a first L-shaped hole 10, one end of the first L-shaped hole 10 is positioned on the front end face of the outlet flange 9, the other end of the first L-shaped hole 10 is positioned on the inner cylindrical surface of the outlet flange 9, the lower end part of a vertical pipe is integrally formed with an inlet flange 11, and the rear side part of the inlet flange 11 is provided with a second L-shaped hole 12, one end of a second L-shaped hole 12 is located on the lower end face of the inlet flange 11, the other end of the second L-shaped hole 12 is located on the outer cylindrical face of the rear side of the inlet flange 11, a U-shaped pipe 13 located in the rotary pipe joint 2 is fixedly connected between the inner end of the second connecting hole and the inner end of the first L-shaped hole 10, a bent pipe 14 located on the rear side of the vertical pipe is fixedly connected between the outer end of the first connecting hole 8 and the rear end of the second L-shaped hole 12, the inlet flange 11 is fixedly connected with the upper end of the water supply pipeline, an outlet flange 9 is fixedly connected with one end of the mechanical arm pipeline, the lower end of the second L-shaped hole 12 is fixedly connected with the upper end of the hydraulic control pipeline on the water supply pipeline, and the rear end of the first L-shaped hole 10 is fixedly connected with one end of the hydraulic control pipeline on the mechanical arm pipeline.

A first step groove is arranged on the inner circle at the front end of the horizontal pipe, a second step groove is arranged on the inner circle at the rear end of the horizontal pipe, a first sealing ring 15 sleeved on the front side part of the rotary pipe joint 2 is fixedly embedded in the bottom of the rear side groove of the first step groove, the first sealing ring 15 is connected with the rotary pipe joint 2 in a sliding and sealing manner, a first bearing 16 and a first isolating pipe sleeve 17 sleeved on the front side part of the rotary pipe joint 2 are fixedly embedded in the front side groove of the first step groove from front to back in sequence, a flange end cover 3 is fixedly arranged at the front end of the horizontal pipe through a plurality of first fastening screws, a rotating gap is reserved between the rear end face of the flange end cover 3 and the front end of the horizontal pipe, a second O-shaped ring 18 tightly contacted with the front end face of the horizontal pipe is fixedly embedded on the edge face of the rear end of the flange end cover 3, a circular ring flange extending into the front side groove of the first step groove is integrally formed on the inner circle at the rear end of the flange end cover 3, the excircle of the circular flange is tightly matched with the inner circle of the front side groove of the first step groove, the rear end of the circular flange is tightly pressed on the front end surface of the outer ring of the first bearing 16, the outer circumference of the front end part of the rotary pipe joint 2 is fixedly embedded with a limit stop ring 19 which is sheathed and tightly pressed on the front end surface of the inner ring of the first bearing 16, the limit stop ring 19 is composed of two half rings, the first bearing 16 is tightly pressed on the first isolation pipe sleeve 17, the first isolation pipe sleeve 17 is tightly pressed on the first sealing ring 15, the bottom of the front side groove of the second step groove is fixedly embedded with a second sealing ring 20 which is sheathed and tightly arranged in the middle part of the rotary pipe joint 2, the rear side groove of the second step groove is fixedly embedded with a second isolation pipe sleeve 21, a second bearing 22 and a third isolation pipe sleeve 23 which are sheathed and arranged in the middle part of the rotary pipe joint 2 from front to back in sequence, the rear end part of the sealing spacer 4 is integrally formed with a circular boss 24, the front side surface of the circular boss 24 is tightly pressed on the rear end surface of the horizontal pipe, a third O-shaped ring 25 which is tightly pressed and contacted with the rear end face of the horizontal pipe is fixedly embedded on the front side face of the circular boss 24, a sealing press ring 5 is concentrically sleeved on the rear end part of the rotary pipe joint 2 and tightly pressed on the rear side face of the circular boss 24, the sealing press ring 5 is fixedly connected with the rear end of the horizontal pipe through a plurality of second fastening screws which penetrate through the circular boss 24, the front side part of the sealing spacer sleeve 4 is embedded on the front side part of the rear side groove of the second step groove, the outer circle of the front side part of the sealing spacer sleeve 4 is in clearance fit with the inner circle of the rear side groove of the second step groove, the inner circle of the front end of the sealing spacer sleeve 4 is provided with a first installation groove, the inner circle of the sealing spacer sleeve 4 is provided with a second installation groove, the front end of the sealing spacer sleeve 4 tightly presses the third isolation pipe sleeve 23, the third isolation pipe sleeve 23 tightly presses the rear end face of the outer circle of the second bearing 22, the front end face of the outer circle of the second bearing 22 tightly presses the second isolation pipe sleeve 21, the second isolation pipe sleeve 20, the third sealing ring 26 which is fixedly embedded on the rear side part of the rotary pipe joint 2, the rotary pipe joint 27, the second sealing ring 27 is fixedly sleeved on the fourth sealing ring 2, and the rotary pipe joint 15, and the fourth sealing ring 27 tightly pressed and the rotary pipe joint 20.

The utility model discloses a lower extreme of horizontal pipe and water supply pipe's upper portion outlet end fixed connection, the rear end of swivel coupling 2 and the one end fixed connection of arm pipeline, then reciprocate the in-process at belt cleaning device, the arm pipeline can be followed belt cleaning device's reciprocating and swing, thereby guarantee water supply pipe and belt cleaning device intercommunication all the time, and hydraulic control pipeline on the outer pipe wall of water supply pipe and arm pipeline passes through as two solitary pipelines respectively the utility model provides a hydraulic passage can remain the intercommunication all the time, compares with a traditional whole hydraulic pipe, can avoid taking place excessive buckling, guarantees that the circulation of hydraulic oil is normal, and each sealing member's setting can improve whole leakproofness greatly, the utility model relates to a science, rational in infrastructure can guarantee that water supply pipe and belt cleaning device and two adjacent hydraulic control pipeline homoenergetic along with belt cleaning device reciprocate and remain the intercommunication all the time along with belt cleaning device

Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the above embodiments are only used for illustration and not for limitation of the technical solutions of the present invention; modifications and equivalents of the present invention may be made without departing from the spirit and scope of the invention, which is intended to be covered by the appended claims.

Claims

1. Two-way rotary joint for connect the water supply pipe's the one end of play water end and arm pipeline, the other end of arm pipeline is connected its characterized in that with belt cleaning device's the end of intaking: including right angle type coupling, swivel joint, the flange end cover, sealed spacer sleeve and sealed clamping ring, right angle type coupling includes vertical pipe and horizontal pipe, the horizontal pipe sets up along the fore-and-aft direction level, the upper end integrated into one piece fixed connection of vertical pipe on the preceding tip downside pipe wall of horizontal pipe and with the inside intercommunication of horizontal pipe, swivel joint sets up and rotates concentrically along the fore-and-aft direction level and installs in the horizontal pipe, swivel joint's front end shutoff, the through-hole that concentric and correspond the intercommunication from top to bottom with vertical pipe is all seted up on swivel joint's preceding lateral part upside pipe wall and the downside pipe wall about, flange end cover fixed mounting is at the front end of horizontal pipe, interval fixed connection is on the rear end of horizontal pipe and concentric suit on swivel joint around sealed spacer sleeve and the sealed clamping ring, sealed clamping ring sticiss the rear end of sealed spacer sleeve, the lower extreme of horizontal pipe and the upper portion delivery end fixed connection of water supply pipe, the rear end of swivel joint and the one end fixed connection of arm pipeline, it is connected with the hydraulic control pipeline all to lay on the wall of water supply pipe and arm pipeline and be connected with the hydraulic pressure channel, swivel joint, be equipped with the vertical pipe on vertical spacer sleeve and the vertical hydraulic pressure channel that is used for communicateing two hydraulic control pipeline.

2. The dual-path revolute joint of claim 1, wherein: the hydraulic channel comprises an annular groove passage arranged on an inner circle in the middle of a sealing spacer sleeve, a first connecting hole which is vertically communicated with the annular groove passage is formed in the rear side portion of the lower side pipe wall of a horizontal pipe and the middle portion of the lower side pipe wall of the sealing spacer sleeve, a second connecting hole which is communicated with the annular groove passage is formed in the rear side portion of the lower side pipe wall of a rotary pipe joint, an outlet flange is integrally formed in the rear end portion of the rotary pipe joint, a first L-shaped hole is formed in the lower side portion of the outlet flange, one end of the first L-shaped hole is located in the front end face of the outlet flange, the other end of the first L-shaped hole is located in the inner cylindrical face of the outlet flange, an inlet flange is formed in the lower end portion of a vertical pipe in an integrated mode, a second L-shaped hole is formed in the rear side portion of the inlet flange, one end of the second L-shaped hole is located in the lower end face of the inlet flange, the other end of the second L-shaped hole is located in the rear end face of the inlet flange, a bent pipe is fixedly connected with an upper end of a pipeline fixedly connected with one end of a mechanical arm, and one end of the first L-shaped pipe fixedly connected with the hydraulic pipeline.

3. The dual-path revolute joint of claim 1, wherein: a first sealing structure is arranged between the front end part of the outer circumference of the rotary pipe joint and the front end part of the inner circumference of the horizontal pipe, and a second sealing structure is arranged between the rear side part of the outer circumference of the rotary pipe joint and the rear end part of the inner circumference of the horizontal pipe.

4. The dual-path revolute joint of claim 3, wherein: the first sealing structure comprises a first sealing ring, a first step groove is formed in the inner circle of the front end of the horizontal pipe, the first sealing ring is fixedly embedded in the bottom of the rear side groove of the first step groove and sleeved on the front side portion of the rotary pipe joint, the first sealing ring is connected with the rotary pipe joint in a sliding and sealing mode, a first bearing and a first isolating pipe sleeve which are sleeved on the front side portion of the rotary pipe joint are fixedly embedded in the front side groove of the first step groove from front to back in sequence, a flange end cover is fixedly installed at the front end of the horizontal pipe through a plurality of first fastening screws, a rotating gap is reserved between the rear end face of the flange end cover and the front end of the horizontal pipe, a second O-shaped ring which is tightly contacted with the front end face of the horizontal pipe is fixedly embedded in the rear end edge face of the flange end cover, an annular flange extending into the front side groove of the first step groove is integrally formed in the rear end inner circle of the flange end cover, the outer circle of the annular flange is tightly matched with the inner circle of the front side groove of the first step groove, and the first isolating pipe sleeve is fixedly embedded in a first limiting ring sleeve which is tightly pressed, and the first limiting pipe sleeve is a first shaft.

5. The dual-path revolute joint of claim 3, wherein: the second sealing structure comprises a second sealing ring, a second step groove is arranged on the inner circle at the rear end of the horizontal pipe, the second sealing ring is fixedly embedded in the bottom of the front side groove of the second step groove and is sleeved in the middle of the rotary pipe joint, a second isolating pipe sleeve, a second bearing and a third isolating pipe sleeve which are sleeved in the middle of the rotary pipe joint are sequentially fixedly embedded in the rear side groove of the second step groove from front to back, a circular boss is integrally formed on the outer circumference of the rear end part of the sealing spacer sleeve, the front side surface of the circular boss is tightly pressed on the rear end surface of the horizontal pipe, a third O-shaped ring which is tightly pressed and contacted with the rear end surface of the horizontal pipe is fixedly embedded on the front side surface of the circular boss, the sealing ring is concentrically sleeved at the rear end part of the rotary pipe joint and tightly pressed on the rear side surface of the circular boss, and is fixedly connected at the rear end of the horizontal pipe through a plurality of second fastening screws which penetrate through the circular boss, the front side part of the sealing spacer sleeve is embedded in the front side part of the rear side groove of the second step groove, the outer circle of the front side part of the sealing spacer sleeve is in clearance fit with the inner circle of the rear side groove of the second step groove, the inner circle of the front end of the sealing spacer sleeve is provided with a first mounting groove, the inner circle of the rear end of the sealing spacer sleeve is provided with a second mounting groove, the front end of the sealing spacer sleeve tightly presses the third isolation pipe sleeve, the third isolation pipe sleeve tightly presses the rear end face of the outer ring of the second bearing, the front end face of the outer ring of the second bearing tightly presses the second isolation pipe sleeve tightly, the second isolation pipe sleeve tightly presses the second sealing ring, a third sealing ring sleeved on the rear side part of the rotary pipe joint is fixedly embedded in the first mounting groove, a fourth sealing ring sleeved on the rear end part of the rotary pipe joint is fixedly embedded in the second mounting groove, the sealing ring tightly presses the fourth sealing ring, and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are tightly matched with the rotary pipe joint, the seal rotates.