CN209772513U - Hollow shaft motor and pipeline inner wall cement mortar spraying machine thereof - Google Patents

Abstract

the utility model discloses a hollow shaft motor and a cement mortar spraying machine for the inner wall of a pipeline thereof, wherein the hollow shaft motor comprises a shell and a hollow shaft, a coil is fixed on the inner side of the shell, the hollow shaft is arranged on the inner side of the coil, and a rotor is fixed at the corresponding position of the hollow shaft and the coil; the two ends of the shell are respectively provided with an end cover, the end covers are respectively provided with a first convex ring, a second convex ring and a third convex ring, the shell is clamped and assembled between the two first convex rings, a bearing is arranged between the second convex ring and the hollow shaft, the bearing is a deep groove ball bearing, and the inner ring and the outer ring of the bearing are respectively fixed with the outer wall of the hollow shaft and the inner side of the second convex ring; and a sealing ring is arranged between the third convex ring and the hollow shaft and is used for sealing a gap between the third convex ring and the hollow shaft. The utility model discloses simple structure, convenient to use can adapt to ground and the pre-buried small-size pipeline of underground under the various complex environment. And the requirement on the inner wall of the pipeline is low, and the pipeline coated with the coating or the cement mortar can be coated.

Description

hollow shaft motor and pipeline inner wall cement mortar spraying machine thereof

Technical Field

The utility model relates to a pipeline inner wall mortar spraying technique especially relates to a hollow shaft motor and pipeline inner wall cement mortar flush coater thereof.

Background

in the prior art, the mortar spraying on the inner wall of the pipeline mainly adopts a centrifugal coating machine and an inner hole sprayer, and the conditions of the centrifugal coating machine and the inner hole sprayer are as follows:

1. the centrifugal coating machine is suitable for coating the inner wall of a small and medium-sized pipeline, and the pipeline to be coated is rotated at a high speed by using mechanical equipment, so that the coating of the pipeline is realized by cement mortar in the pipeline under the action of centrifugal force. The centrifugal coating machine can coat the inner walls of various small and medium-sized pipelines, has good visibility to the coated pipelines, and can quickly realize the exchange among pipelines with various calibers.

However, the centrifugal coater is generally used for coating a pipeline on the ground, and cannot coat an underground pipeline which is already laid, and is generally used for pipe laying after prefabrication.

2. the inner hole sprayer is suitable for coating inner walls of small holes and medium-sized pipelines, and is characterized in that high-pressure paint conveyed by an airless sprayer is atomized by a special nozzle to directly form a hollow periphery divergent shape and be uniformly sprayed on the inner surface of the pipeline, so that the pipeline coating is realized. The inner hole sprayer is suitable for light structure, the inner wall of the coated pipeline is high in smoothness and high in atomization degree, and the ground and the embedded pipeline can be coated.

the inner hole sprayer has higher requirements on the smoothness of the inner wall of the pipeline and the viscosity of paint, and is generally used for coating new pipelines or newly embedded pipelines, and if the inner wall of an old pipeline is coated, the inner wall of the pipeline needs to be thoroughly cleaned and the workload of flushing is larger. The equipment needs to clean the nozzle after construction or is difficult; in addition, the speed of the machine body dragging backwards, the viscosity of the materials and the pressure of the spraying machine are closely related to the coating of the pipeline, so that construction operators have certain requirements.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defect of prior art, the utility model aims to solve the technical problem that a hollow shaft motor and pipeline inner wall cement mortar flush coater is provided, it adopts hole sprayer formula design and simple structure, can trowel the pipeline inner wall before the spraying to guarantee construction quality.

In order to achieve the purpose, the utility model provides a hollow shaft motor, which comprises a shell and a hollow shaft, wherein a coil is fixed on the inner side of the shell, the hollow shaft is arranged on the inner side of the coil, and a rotor is fixed at the position of the hollow shaft corresponding to the coil; the end covers are respectively arranged at two ends of the shell, a first convex ring, a second convex ring and a third convex ring are respectively arranged on the end covers, the shell is clamped and assembled between the two first convex rings, a bearing is arranged between the second convex ring and the hollow shaft, the bearing is a deep groove ball bearing, and the inner ring and the outer ring of the bearing are respectively fixed with the outer wall of the hollow shaft and the inner side of the second convex ring;

And a sealing ring is arranged between the third convex ring and the hollow shaft and is used for sealing a gap between the third convex ring and the hollow shaft.

Preferably, the sealing ring is made of rubber or polytetrafluoroethylene.

Preferably, two ends of the hollow shaft penetrate out of the two end covers respectively, at least one end of the hollow shaft is provided with a clamping groove and a threaded hole, the clamping groove is clamped and assembled with a clamping protrusion, the clamping protrusion is arranged on the inner side of a first connecting flange, the first connecting flange is sleeved at the end part of the hollow shaft, and a fixing screw penetrates through the first connecting flange and then is assembled and fixed with the threaded hole; the first connecting flange is also provided with a connecting through hole;

A second connecting flange is fixed on the feeding pipe close to the first connecting flange, the first connecting flange is tightly attached to the end face of the second connecting flange, and connecting bolts respectively penetrate through the first connecting flange and the connecting through hole; the two ends of the connecting bolt respectively penetrate out of the first connecting flange and the connecting through hole, and the two ends of the connecting bolt penetrating out of the first connecting flange and the connecting through hole are respectively assembled with the connecting nut in a screwing mode through threads.

Preferably, the sealing ring, the bearing, the end cover and the hollow shaft jointly enclose a hole cavity, a communication hole penetrating through the side wall of the hollow shaft is formed in the hollow shaft, and the communication hole is communicated with the hole cavity.

Preferably, the rotor is fixed to the hollow shaft by a stationary cylinder.

A cement mortar spraying machine for the inner wall of a pipeline is applied to the hollow shaft motor.

preferably, the spraying device also comprises a walking motor, a slurry pump, a hollow shaft motor and a spraying disc, wherein an output shaft of the walking motor is arranged in the reduction gearbox and can be rotatably assembled with the reduction gearbox; the first travelling wheel is arranged outside the reduction gearbox, the shell of the reduction gearbox is fixedly assembled with the shell of the slurry pump through a connecting plate, and a suction inlet of the slurry pump is communicated with one end of the feed pipe;

the output port of the slurry pump is communicated with one end of a discharge pipe, the other end of the discharge pipe is communicated with one end of a feeding pipe through a connecting head assembly, and the feeding pipe is assembled and fixed with the inner side of a hollow shaft motor; the other end of the feeding pipe is hermetically assembled with a sleeve, the sleeve is fixed on a spraying plate, a plurality of spraying holes are formed in the spraying plate, and the interior of the feeding pipe is communicated with the spraying holes;

a fixed seat is fixed on the spraying plate, and a fixed bolt penetrates through the fixed plate and is assembled and fixed with the fixed seat after being sleeved with a spring; the fixed plate is fixedly assembled with one end of the connecting rod, and the other end of the connecting rod is fixedly assembled with the troweling plate.

preferably, two driving bevel gears are fixed on the output shaft, each driving bevel gear is in meshing transmission with two driven bevel gears respectively, the driven bevel gears are fixedly assembled with one end of a second shaft body, a meshing tooth part is arranged on the second shaft body, the meshing tooth part is in meshing transmission with a speed reduction tooth, the speed reduction tooth is fixed at one end of a first shaft body, and the other end of the first shaft body penetrates through the reduction gearbox and then is fixedly assembled with a first travelling wheel; the first shaft body and the second shaft body are respectively rotatably assembled with the reduction gearbox shell.

Preferably, the feeding pipe, the hollow shaft, the spraying disc and the inner pipe are coaxial, and at least two of the troweling plates are symmetrically arranged by taking the circle center of the spraying disc as the center.

Preferably, the connecting head assembly comprises a first flange fixed at the end part of the discharge pipe and a fixed disc fixed at the end part of the feed pipe, wherein an installation cylinder is arranged on the fixed disc, and the inner wall of the installation cylinder is assembled with the end part and the outer wall of the discharge pipe through a rolling bearing; the feeding pipe is arranged in the discharging pipe, and the discharging pipe and the feeding pipe are sealed through a sealing ring;

The outer part of the fixed disk is sleeved with a limiting cylinder, and a screw passes through the limiting cylinder and is screwed and fixed with the fixed disk through threads; the limiting cylinder is also assembled and fixed with a shaft ring of the first thrust ball bearing, and a seat ring of the first thrust ball bearing is tightly attached or assembled and fixed with the end face of the first flange plate; the fixed disc is assembled and fixed with a shaft ring of the second thrust ball bearing, and a seat ring of the second thrust ball bearing is tightly attached or fixed with the end surface of the second flange plate; the second flange plate is sleeved outside the feeding pipe;

two ends of the connecting screw rod respectively penetrate out of the first flange plate and the second flange plate, and two ends of the connecting screw rod penetrating out of the first flange plate and the second flange plate are respectively assembled and fixed with the nut through screw threads.

The utility model has the advantages that: the utility model discloses simple structure, convenient to use can adapt to ground and the pre-buried small-size pipeline of underground under the various complex environment. And the requirement on the inner wall of the pipeline is low, the pipeline coated with paint or cement mortar can be coated, the requirement on the operation of constructors is low, the service life of the pipeline can be prolonged, and the cost can be reduced.

Drawings

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

fig. 2 is a schematic structural diagram of the reduction gearbox of the present invention.

Fig. 3 is a schematic structural view of the hollow shaft motor and the connector assembly of the present invention.

Fig. 4 is a schematic structural view of the hollow shaft motor of the present invention.

Fig. 5 is a schematic view of the assembly structure of the hollow shaft and the conveying pipe of the present invention.

Fig. 6 is a schematic view of an assembly structure of the first connecting flange and the hollow shaft according to the present invention.

Detailed Description

The invention will be further explained with reference to the following figures and examples:

Referring to fig. 1-3, a cement mortar spraying machine for the inner wall of a pipeline comprises a walking motor 210, a mud pump 220, a hollow shaft motor 230 and a spraying disc 520, wherein an output shaft 211 of the walking motor 210 is arranged in a reduction gearbox 300 and is rotatably assembled with the reduction gearbox 300;

Two driving bevel gears 342 are fixed on the output shaft 211, each driving bevel gear 342 is in meshing transmission with two driven bevel gears 341, the driven bevel gears 341 are fixedly assembled with one end of the second shaft body 322, a meshing gear part 332 is arranged on the second shaft body 322, the meshing gear part 332 is in meshing transmission with a reduction gear 331, the reduction gear 331 is fixed at one end of the first shaft body 321, and the other end of the first shaft body 321 penetrates through the reduction gearbox 300 and is fixedly assembled with the first traveling wheel 310; the first shaft 321 and the second shaft 322 are rotatably assembled with the gearbox housing respectively.

The casing of the reduction gearbox 300 is fixedly assembled with the casing of the mud pump 220 through the connecting plate 350, a suction inlet of the mud pump 220 is communicated with one end of the feed pipe 410, and when the mud pump is used, the other end of the feed pipe 410 is communicated with a pipeline for spraying cement mortar, so that the cement mortar is sucked into the mud pump 220;

The output port of the mud pump 220 is communicated with one end of a discharge pipe 610, the other end of the discharge pipe 610 is communicated with one end of a feeding pipe 620 through a connecting head assembly, and the feeding pipe 620 is fixedly assembled with the inner side of a hollow shaft 231 of the hollow shaft motor 230, so that the hollow shaft motor 230 can drive the feeding pipe 620 to rotate circumferentially;

The other end of the feeding pipe 620 is hermetically assembled with the sleeve 510, the sleeve 510 is fixed on the spraying tray 520, a plurality of spraying holes 521 are formed in the spraying tray 520, and the feeding pipe 620 is communicated with the spraying holes 521 so as to spray cement mortar from the spraying holes;

The hollow shaft motor 230 shell and the mud pump 220 shell are fixedly assembled, a support shell 420 is fixed on the mud pump 220, a second travelling wheel 430 is installed on the support shell 420, and the second travelling wheel 430 can circumferentially rotate relative to the support shell 420. Preferably, the second road wheel 430 is a universal wheel;

the fixing seat 530 is fixed on the spraying disc 520, and the fixing bolt 570 is sleeved with the spring 580, penetrates through the fixing plate 540 and is screwed with the fixing seat 530 for assembly and fixation through threads, so that the spring 580 is compressed between the large end of the fixing bolt 570 and the fixing plate 540;

the fixing plate 540 is fixedly assembled with one end of the connecting rod 550, and the other end of the connecting rod 550 is fixedly assembled with the troweling plate 560.

Referring to fig. 1, during the use, with pipeline one end and inlet pipe 410 switch-on, the other end and cement mortar intercommunication, then will the utility model discloses put into the inner tube 101 of pipeline 100, then start walking motor 210, slush pump 220, hollow shaft motor 230 for walking motor 210 drives first walking wheel 310 and moves along inner tube 101 from the right side to the left, and simultaneously, the slush pump is constantly sent into cement mortar in spraying hole 521, at last by spraying hole 521 to the inner wall spraying of inner tube 101. After the spraying is finished, the spraying plate 520 drives the troweling plate 560 to rotate around the axis of the spraying plate, so that the troweling plate 560 continuously screeds the sprayed cement mortar, and the smoothness of the sprayed cement mortar is ensured.

Preferably, the feeding tube 620, the hollow shaft 231, the spraying tray 520 and the inner tube 101 are coaxial, and the troweling plate 560 is at least two, and is symmetrically arranged with the axis (or the center of a circle, left side view in fig. 1) of the spraying tray 520 as the center. The inner wall of the inner pipe can be uniformly sprayed by the spraying holes 521 due to the design, and the troweling plate 560 can trowel the sprayed cement mortar and ensure that the sprayed coating is coaxial with the inner pipe as much as possible.

referring to fig. 3, the connecting head assembly includes a first flange 631 fixed at an end of the discharge pipe 610, and a fixed disc 621 fixed at an end of the feeding pipe 620, wherein the fixed disc 621 is provided with an installation cylinder 622, an inner wall of the installation cylinder 622 is assembled with the end and an outer wall of the discharge pipe 610 through a rolling bearing 730, preferably, an inner ring of the rolling bearing 730 is assembled and fixed with an outer wall of the discharge pipe 610, and an outer ring of the rolling bearing 730 is attached or fixed with an inner wall of the installation cylinder 622;

The feeding pipe 620 is arranged in the discharging pipe 610, the discharging pipe 610 and the feeding pipe 620 are sealed through a sealing ring 740, and the sealing ring 740 is made of polytetrafluoroethylene;

the fixed disc 621 is sleeved with a limiting cylinder 650, a screw 660 passes through the limiting cylinder 650 and is screwed and fixed with the fixed disc 621 through threads, so that the fixed disc 621 and the limiting cylinder 650 are assembled and fixed, and the end part and the inner side of the limiting cylinder 650 are tightly attached to the end surface of the rolling bearing 730, so that the rolling bearing 730 is limited to move axially;

The limiting cylinder 650 is also assembled and fixed with a shaft ring of the first thrust ball bearing 710, and a seat ring of the first thrust ball bearing 710 is attached or assembled and fixed with the end face of the first flange 631;

the fixed disc 621 is assembled and fixed with a shaft ring of the second thrust ball bearing 720, and a seat ring of the second thrust ball bearing 720 is tightly attached or fixed with an end face of the second flange plate 632; the second flange 632 is sleeved outside the feeding pipe 620;

Two ends of the connecting screw 640 respectively penetrate through the first flange 631 and the second flange 632, and the two ends penetrating through the first flange 631 and the second flange 632 are respectively screwed with the nut 641 for assembly and fixation, so that the first flange 631 and the second flange 632 are mutually tightened.

During the use, discharging pipe 610 is fixed, and conveying pipe 620 can circumferential direction, conveying pipe 620 can drive fixed disk 621 and rotate during the rotation, but assemble through antifriction bearing 730 between fixed disk 621 and the discharging pipe 610, and first ring flange 631, respectively through first thrust ball bearing 710 between the second ring flange 632, second thrust ball bearing 720 assembles, thereby make conveying pipe 620, when fixed disk 621 rotates, can not drive discharging pipe 610, first ring flange 631, second ring flange 632 rotates, but it is sealed through the sealing washer between discharging pipe 610 and the conveying pipe 620, thereby make discharging pipe 610 and conveying pipe 620 junction can be sealed relatively, again can rotate relatively, simultaneously through first ring flange 631, the axial restriction of second ring flange 632, can prevent again that discharging pipe 610 and conveying pipe 620 junction from taking place axial displacement or pulling out.

the sealing washer adopts polytetrafluoroethylene mainly to consider that the feeding pipe can rotate, will guarantee sealed moreover, adopts polytetrafluoroethylene can utilize polytetrafluoroethylene's self-lubricity to reduce the wearing and tearing between discharging pipe 610 and the feeding pipe 620, can also obtain better leakproofness simultaneously.

referring to fig. 4-6, the hollow shaft motor 230 includes a housing 232 and a hollow shaft 231, a coil 810 (stator) is fixed inside the housing 232, the hollow shaft 231 is installed inside the coil 810, and a rotor 820 is fixed at a position of the hollow shaft 231 corresponding to the coil 810, when in use, the coil is electrified to drive the rotor to rotate, that is, the hollow shaft is driven to rotate, which is consistent with the principle of the existing motor;

end covers 233 are respectively mounted at two ends of the outer shell 232, a first convex ring 2331, a second convex ring 2332 and a third convex ring 2333 are respectively arranged on the end covers 233, the outer shell 232 is clamped and assembled between the two first convex rings 2331, a bearing 235 is mounted between the second convex ring 2332 and the hollow shaft 231, the bearing is a deep groove ball bearing, and the inner ring and the outer ring of the bearing are respectively fixed with the outer wall of the hollow shaft 231 and the inner side of the second convex ring 2332;

A sealing ring 234 is installed between the third protruding ring 2333 and the hollow shaft 231, and the sealing ring 234 is used for sealing a gap between the third protruding ring 2333 and the hollow shaft 231 and can be made of rubber or teflon.

Two ends of the hollow shaft 231 respectively penetrate through the two end covers 233, at least one end of the hollow shaft 231 is provided with a clamping groove 2311 and a threaded hole 232, the clamping groove 2311 is clamped and assembled with a clamping protrusion 841, the clamping protrusion is arranged on the inner side of the first connecting flange 840, the first connecting flange 840 is sleeved at the end of the hollow shaft 231, and the fixing screw 870 penetrates through the first connecting flange 840 and then is screwed and assembled with the threaded hole 232 through threads, so that the first connecting flange 840 is fixed on the hollow shaft 230; the first connecting flange 840 is also provided with a connecting through hole 842;

A second connecting flange 850 is fixed on the feeding pipe 620 close to the first connecting flange 840, the first connecting flange 840 is tightly attached to the end face of the second connecting flange 850, and a connecting bolt 860 respectively penetrates through the first connecting flange 840 and the connecting through hole 842; the two ends of the connecting bolt 860 penetrate through the first connecting flange 840 and the connecting through hole 842 respectively, and the two ends of the connecting bolt 860 penetrating through the first connecting flange 840 and the connecting through hole 842 are assembled with the connecting nut 861 through threads in a screwing manner respectively, so that the first connecting flange 840 and the second connecting flange 850 are assembled and fixed, namely the hollow shaft 231 and the feeding pipe 620 are assembled and fixed.

Preferably, the sealing ring 234, the bearing 235, the end cover 233 and the hollow shaft 231 together enclose a bore 236, a communication hole 2313 penetrating through the side wall of the hollow shaft 231 is formed in the hollow shaft 231, and the communication hole 2313 is communicated with the bore 236. When the hollow shaft motor is used, lubricating oil can be added into the hole 236 through the communication hole 2313, so that the bearing 235 is lubricated, and the service life of the hollow shaft motor is prolonged.

preferably, the rotor is fixed to the hollow shaft by a fixed barrel 830.

The details of the present invention are well known to those skilled in the art.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. a hollow shaft motor is characterized in that: the motor comprises a shell and a hollow shaft, wherein a coil is fixed on the inner side of the shell, the hollow shaft is arranged on the inner side of the coil, and a rotor is fixed at the position of the hollow shaft corresponding to the coil; the end covers are respectively arranged at two ends of the shell, a first convex ring, a second convex ring and a third convex ring are respectively arranged on the end covers, the shell is clamped and assembled between the two first convex rings, a bearing is arranged between the second convex ring and the hollow shaft, the bearing is a deep groove ball bearing, and the inner ring and the outer ring of the bearing are respectively fixed with the outer wall of the hollow shaft and the inner side of the second convex ring;

And a sealing ring is arranged between the third convex ring and the hollow shaft and is used for sealing a gap between the third convex ring and the hollow shaft.

2. A hollow shaft motor as claimed in claim 1, wherein: the sealing ring is made of rubber or polytetrafluoroethylene.

3. a hollow shaft motor as claimed in claim 1, wherein: the feeding pipe is characterized by further comprising a feeding pipe, wherein two ends of the hollow shaft penetrate out of the two end covers respectively, at least one end of the hollow shaft is provided with a clamping groove and a threaded hole, the clamping groove is clamped and assembled with a clamping protrusion, the clamping protrusion is arranged on the inner side of a first connecting flange, the first connecting flange is sleeved at the end part of the hollow shaft, and a fixing screw penetrates through the first connecting flange and then is assembled and fixed with the threaded hole; the first connecting flange is also provided with a connecting through hole;

A second connecting flange is fixed on the feeding pipe close to the first connecting flange, the first connecting flange is tightly attached to the end face of the second connecting flange, and connecting bolts respectively penetrate through the first connecting flange and the connecting through hole; the two ends of the connecting bolt respectively penetrate out of the first connecting flange and the connecting through hole, and the two ends of the connecting bolt penetrating out of the first connecting flange and the connecting through hole are respectively assembled with the connecting nut in a screwing mode through threads.

4. a hollow shaft motor as claimed in claim 3, wherein: the sealing ring, the bearing, the end cover and the hollow shaft jointly enclose a hole cavity, a communication hole penetrating through the side wall of the hollow shaft is formed in the hollow shaft, and the communication hole is communicated with the hole cavity.

5. A hollow shaft motor as claimed in claim 1, wherein: the rotor is fixed on the hollow shaft through the fixed cylinder.

6. The utility model provides a pipeline inner wall cement mortar flush coater which characterized by: use of a hollow shaft motor according to any of claims 1 to 5.

7. The pipe inner wall cement mortar spraying machine of claim 6, characterized in that: the output shaft of the walking motor is arranged in the reduction gearbox and can be rotatably assembled with the reduction gearbox; the first travelling wheel is arranged outside the reduction gearbox, the shell of the reduction gearbox is fixedly assembled with the shell of the slurry pump through a connecting plate, and a suction inlet of the slurry pump is communicated with one end of the feed pipe;

The output port of the slurry pump is communicated with one end of a discharge pipe, the other end of the discharge pipe is communicated with one end of a feeding pipe through a connecting head assembly, and the feeding pipe is assembled and fixed with the inner side of a hollow shaft motor; the other end of the feeding pipe is hermetically assembled with a sleeve, the sleeve is fixed on a spraying plate, a plurality of spraying holes are formed in the spraying plate, and the interior of the feeding pipe is communicated with the spraying holes;

A fixed seat is fixed on the spraying plate, and a fixed bolt penetrates through the fixed plate and is assembled and fixed with the fixed seat after being sleeved with a spring; the fixed plate is fixedly assembled with one end of the connecting rod, and the other end of the connecting rod is fixedly assembled with the troweling plate.

8. the pipe inner wall cement mortar spraying machine of claim 7, characterized in that: two driving bevel gears are fixed on the output shaft, each driving bevel gear is in meshing transmission with the two driven bevel gears respectively, the driven bevel gears are fixedly assembled with one end of a second shaft body, a meshing tooth part is arranged on the second shaft body, the meshing tooth part is in meshing transmission with a speed reduction tooth, the speed reduction tooth is fixed at one end of a first shaft body, and the other end of the first shaft body penetrates through a reduction gearbox and then is fixedly assembled with a first travelling wheel; the first shaft body and the second shaft body are respectively rotatably assembled with the reduction gearbox shell.

9. The pipe inner wall cement mortar spraying machine of claim 7, characterized in that: the feeding pipe, the hollow shaft, the spraying disc and the inner pipe are coaxial, and at least two of the troweling plates are symmetrically arranged by taking the circle center of the spraying disc as the center.

10. the pipe inner wall cement mortar spraying machine of claim 7, characterized in that: the connector assembly comprises a first flange fixed at the end part of the discharge pipe and a fixed disc fixed at the end part of the feed pipe, wherein an installation cylinder is arranged on the fixed disc, and the inner wall of the installation cylinder is assembled with the end part and the outer wall of the discharge pipe through rolling bearings; the feeding pipe is arranged in the discharging pipe, and the discharging pipe and the feeding pipe are sealed through a sealing ring;

The outer part of the fixed disk is sleeved with a limiting cylinder, and a screw passes through the limiting cylinder and is screwed and fixed with the fixed disk through threads; the limiting cylinder is also assembled and fixed with a shaft ring of the first thrust ball bearing, and a seat ring of the first thrust ball bearing is tightly attached or assembled and fixed with the end face of the first flange plate; the fixed disc is assembled and fixed with a shaft ring of the second thrust ball bearing, and a seat ring of the second thrust ball bearing is tightly attached or fixed with the end surface of the second flange plate; the second flange plate is sleeved outside the feeding pipe;

Two ends of the connecting screw rod respectively penetrate out of the first flange plate and the second flange plate, and two ends of the connecting screw rod penetrating out of the first flange plate and the second flange plate are respectively assembled and fixed with the nut through screw threads.