CN114146867B

CN114146867B - Pretreatment device for inner wall spraying process of nodular cast tube

Info

Publication number: CN114146867B
Application number: CN202111309376.7A
Authority: CN
Inventors: 韩永; 韩操; 董广合; 孟庆亚; 翟建伟
Original assignee: Xuzhou Huazheng Casting Co ltd
Current assignee: Xuzhou Huazheng Casting Co ltd
Priority date: 2021-11-06
Filing date: 2021-11-06
Publication date: 2023-04-07
Anticipated expiration: 2041-11-06
Also published as: CN114146867A

Abstract

The invention relates to the technical field of spraying of the inner wall of a nodular cast pipe, and discloses a pretreatment device for a spraying process of the inner wall of the nodular cast pipe, which comprises a device plate body, wherein the top of the device plate body is provided with a pretreatment mechanism and a spraying mechanism; the pretreatment mechanism comprises a first fixed shell plate, a first electric telescopic cylinder and a second fixed shell plate. According to the invention, through the first electric telescopic cylinder on the first fixed shell plate and the double-head motor on the second fixed shell plate, the double-head motor can be used for driving the blowing fan blade and the cleaning bristles to rotate so as to clean the inner wall of the nodular cast tube, and in the cleaning process, the electric telescopic cylinder can be used for moving the distance of the double-head motor so as to pretreat the nodular cast tubes with different sizes, and the motor can also drive the blowing fan blade and the cleaning bristles to integrally rotate so as to clean multiple positions of the inner wall of the nodular cast tube, and the water pump can be used for spraying water in the second fixed shell plate so as to clean the inner wall of the nodular cast tube.

Description

Pretreatment device for inner wall spraying process of nodular cast tube

Technical Field

The invention relates to the technical field of spraying of inner walls of nodular cast pipes, in particular to a pretreatment device for a spraying process of the inner walls of the nodular cast pipes.

Background

Patent number CN202021552318.8 discloses a metal pipeline anticorrosive paint's inner wall spraying device, including the support plate, the equal fixedly connected with supporting leg in both sides of support plate bottom, the horizontal fixedly connected with diaphragm in the bottom of supporting leg inboard, the top fixedly connected with of diaphragm scribbles the workbin, scribble the left top intercommunication of workbin and have the filling tube, scribble the left bottom intercommunication of workbin and have row material pipe, the left side at diaphragm top is provided with the centrifugal pump, the input intercommunication of centrifugal pump has the connecting pipe, the left end of connecting pipe and the bottom intercommunication on scribbling the workbin right side. The utility model provides a current inner wall spraying device can not be to the problem of metal pipeline's inner wall even spraying, this metal pipeline anticorrosive paint's inner wall spraying device possesses the advantage of high-efficient even spraying, and convenient to use person uses inner wall spraying device, has saved a large amount of times of user, has improved inner wall spraying device's work efficiency.

The existing spraying device for the inner wall of the nodular cast iron pipe cannot perform pretreatment before spraying in the using process, so that the nodular cast iron pipe needs to be pretreated by other equipment, the transportation and the cost are increased, a pretreatment mechanism and a spraying mechanism cannot be combined together, and the spraying is directly performed under the condition that the nodular cast iron pipe is not moved after the pretreatment is completed.

Disclosure of Invention

The invention aims to provide a pretreatment device for a spraying process of the inner wall of a nodular cast tube, which solves the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a pretreatment device for a spraying process of the inner wall of a nodular cast tube comprises a device plate body, wherein a pretreatment mechanism and a spraying mechanism are arranged at the top of the device plate body;

the pretreatment mechanism comprises a first fixed shell plate, a first electric telescopic cylinder, a second fixed shell plate, a first motor protective cover, a motor, a first motor shaft, a round hole, a separation net, a second motor protective cover, a double-end motor, a second motor shaft, a fixed strip plate, cleaning bristles, a blowing fan blade, a first pipeline, a water pump and a second pipeline; a round hole is formed in a plate body of the device, a separation net is fixedly connected inside the round hole, a first motor protection cover is bolted to the bottom of the separation net, a motor is bolted to the bottom end inside the first motor protection cover, a first motor shaft is connected to the top of the motor, a first fixed shell plate is fixedly connected to the top of the first motor shaft through the separation net, one end of a first electric telescopic cylinder is bolted to each of the left side and the right side of the first fixed shell plate, a second fixed shell plate is fixedly connected to the other end of the first electric telescopic cylinder, one end of the second fixed shell plate, which is far away from the first electric telescopic cylinder, is equidistantly bolted to a plurality of second motor protection covers, a double-headed motor is bolted to one end inside the second motor protection cover, a second motor shaft is connected to one end of the double-headed motor, one end of the second motor shaft, which is far away from the first electric telescopic cylinder, is fixedly connected to a fixed slat, one end of the fixed slat, which is far away from the second motor shaft, is fixedly connected to cleaning bristles, one end of the second motor shaft, is fixedly connected to one end of the outside of the second motor shaft, is communicated with two first pipelines, and communicated with a fan blade, and communicated with one pipeline, and communicated with one end of the second fixed shell plate, and communicated with a second pipeline, and communicated with a water pump pipeline, and communicated with a first water pump;

the spraying mechanism comprises a second electric telescopic cylinder, a third pipeline, a coating pump, a fourth pipeline, an electric heating pipe, a brush barrel and a limiting block; equal bolted connection in both sides bottom has the electronic telescoping cylinder of second around the first fixed shell plate, the electronic telescoping cylinder top one end fixedly connected with electrothermal tube of second, brush section of thick bamboo fixedly connected with stopper is passed at the electrothermal tube top, the equal equidistance intercommunication in both sides has the one end of a plurality of third pipelines around the first fixed shell plate, the other end intercommunication of third pipeline has the coating pump, the one end intercommunication that the third pipeline was kept away from to the coating pump has the fourth pipeline.

As a preferred embodiment of the present invention, one end of the double-headed motor, which is close to the first fixed shell plate, is connected to a third motor shaft, one end of the third motor shaft, which is far away from the double-headed motor, passes through the second motor protective cover, the second fixed shell plate and the first fixed shell plate, and both upper and lower ends of the third motor shaft, which are located inside the second fixed shell plate and the first fixed shell plate, are fixedly connected to a stirring rod.

As a preferred embodiment of the present invention, a sealing rubber ring is fixedly connected to a penetrating portion of the third motor shaft, the second fixed shell plate and the first fixed shell plate.

As a preferred embodiment of the present invention, the top of the first fixed shell plate and the upper and lower ends of the second fixed shell plate are both communicated with a connecting pipe, and the other end of the connecting pipe is rotatably connected with a first pipe cover.

As a preferred embodiment of the present invention, the bottom of the plate body of the device is connected with a water receiving casing by a bolt, the water receiving casing is of an open structure, the right side of the water receiving casing is communicated with one end of a water outlet pipe, and the other end of the water outlet pipe is rotatably connected with a second pipe cover.

According to a preferred embodiment of the invention, a protection box body is connected to the top of a plate body of the device through bolts, a hinge is fixedly connected to the left end of the front side of the protection box body, and a box body baffle is rotatably connected to the front side of the hinge.

As a preferred embodiment of the present invention, the top of the protection box body is an open structure, and a cover plate is attached to the top of the protection box body.

In a preferred embodiment of the present invention, an electric slip ring penetrates through an outer side of the first motor shaft, and the electric slip ring is electrically connected to the first electric telescopic cylinder, the second electric telescopic cylinder, the water pump, the spray pump, the electric heating tube, and the double-head motor.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, through the first electric telescopic cylinder on the first fixed shell plate and the double-head motor on the second fixed shell plate, the double-head motor can be used for driving the blowing fan blade and the cleaning bristles to rotate so as to clean the inner wall of the nodular cast tube, and in the cleaning process, the electric telescopic cylinder can be used for moving the distance of the double-head motor, so that the nodular cast tubes with different sizes are pretreated.

2. According to the invention, the second electric telescopic cylinder and the brush cylinder are arranged on the first fixed shell plate, so that the coating in the first fixed shell plate can be sprayed to the surface of the brush cylinder by using a coating pump, the inner wall of the nodular cast pipe is coated by using the brush cylinder, and the distance between the brush cylinders can be adjusted by using the second electric telescopic cylinder, so that the nodular cast pipes with different sizes can be coated without moving the position of the nodular cast pipe, the brush cylinder is driven by the motor to rotate, multiple positions of the inner wall of the nodular cast pipe can be coated, and the pretreatment device for the spraying process of the inner wall of the nodular cast pipe is more practical.

3. The electric heating pipe penetrates through the brush barrel, so that the drying mechanism and the brushing mechanism can be combined together, after coating is finished, the electric heating pipe can be rotated to dry a plurality of positions of the inner wall of the nodular cast tube, and the pretreatment device for the spraying process of the inner wall of the nodular cast tube is more practical.

4. According to the invention, the third motor shaft is arranged on the double-head motor, so that the third motor shaft can penetrate through the inner parts of the two fixed shell plates, water and paint in the first fixed shell plate and the second fixed shell plate can be simultaneously stirred in the rotating process of the double-head motor, the paint is prevented from being solidified, an additional driving mechanism is not required, and the pretreatment device for the inner wall spraying process of the nodular cast tube is more practically used.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic diagram of the overall structure of a pretreatment device for a process of spraying the inner wall of a ductile cast iron pipe according to the present invention;

FIG. 2 is a schematic view of the internal structure of a second motor protection cover of the pretreatment device for the inner wall spraying process of the ductile cast iron pipe according to the present invention;

FIG. 3 is a schematic side view of a first fixing shell plate of a pretreatment device for a spraying process of an inner wall of a nodular cast iron pipe according to the present invention;

FIG. 4 is a schematic diagram of the internal structures of the first and second fixed shell plates of the pretreatment device for the inner wall spraying process of the nodular cast iron pipe according to the present invention.

In the figure: 1. a device board body; 2. a protective box body; 3. a hinge; 4. a box body baffle plate; 5. a cover plate; 6. water is received in the shell; 7. a water outlet pipe; 8. a second tube cover; 9. a circular hole; 10. separating the net; 11. a first motor protection cover; 12. a motor; 13. a first motor shaft; 14. an electric slip ring; 15. a first stationary shell plate; 16. a first electric telescopic cylinder; 17. a second stationary housing plate; 18. a second motor protection cover; 19. a double-headed motor; 20. a second motor shaft; 21. fixing the ribbon board; 22. cleaning the bristles; 23. a blower blade; 24. a first pipe; 25. a water pump; 26. a second conduit; 27. a second electric telescopic cylinder; 28. an electric heating tube; 29. a brush cylinder; 30. a limiting block; 31. a third pipeline; 32. a paint pump; 33. a fourth duct 34, a third motor shaft; 35. a stirring rod; 36. a connecting pipe; 37. a first tube cover.

Detailed Description

Referring to fig. 1-4, the present invention provides a technical solution: a pretreatment device for a spraying process of the inner wall of a nodular cast tube comprises a device plate body 1, wherein a pretreatment mechanism and a spraying mechanism are arranged at the top of the device plate body 1;

the pretreatment mechanism comprises a first fixed shell plate 15, a first electric telescopic cylinder 16, a second fixed shell plate 17, a first motor protective cover 11, a motor 12, a first motor shaft 13, a round hole 9, a separation net 10, a second motor protective cover 18, a double-end motor 19, a second motor shaft 20, a fixed batten 21, cleaning bristles 22, a blowing fan blade 23, a first pipeline 24, a water pump 25 and a second pipeline 26; a round hole 9 is formed in the device plate body 1, a separation net 10 is fixedly connected in the round hole 9, a first motor protective cover 11 is bolted at the bottom of the separation net 10, a motor 12 is bolted at the bottom end in the first motor protective cover 11, a first motor shaft 13 is connected at the top of the motor 12, a first fixed shell plate 15 is fixedly connected at the top of the first motor shaft 13 penetrating through the separation net 10, a plurality of second motor protective covers 18 are bolted at equal intervals at the left side and the right side of the first fixed shell plate 15, a double-headed motor 19 is bolted at one end in the second motor protective cover 18, a second fixed shell plate 20 is fixedly connected at the other end of the first motor telescopic cylinder 16, a fixed batten 18 is fixedly connected at one end of the second fixed shell plate 17 far away from the first motor telescopic cylinder 16, a fixed batten 21 is fixedly connected at one end of the fixed batten 21 far away from the second motor 20, a second motor shaft 20 is connected at one end of the double-headed motor 19 penetrating through the second motor protective cover 18, a second motor shaft 24 is fixedly connected with a fixed batten 24, and a water pump 25 is communicated with a first water pump 24, and a first water pump 25 is communicated with a first water pump 17;

the spraying mechanism comprises a second electric telescopic cylinder 27, a third pipeline 31, a coating pump 32, a fourth pipeline 33, an electric heating pipe 28, a brush cylinder 29 and a limiting block 30; the equal bolted connection in both sides bottom has the electronic telescopic cylinder 27 of second around the first fixed shell plate 15, the electronic telescopic cylinder 27 top one end fixedly connected with electrothermal tube 28 of second, brush section of thick bamboo 29 fixedly connected with stopper 30 is passed at electrothermal tube 28 top, the equal equidistance intercommunication in both sides has the one end of a plurality of third pipelines 31 around the first fixed shell plate 15, the other end intercommunication of third pipeline 31 has scribbles the material pump 32, the one end intercommunication that third pipeline 31 was kept away from to scribble the material pump 32 has fourth pipeline 33.

It should be noted that, by using the first electric telescopic cylinder 16 on the first fixed shell 15 and the double-head motor 19 on the second fixed shell 17, not only the blower blades 23 and the cleaning bristles 22 can be driven by the double-head motor 19 to rotate to clean the inner wall of the nodular cast pipe, but also the electric telescopic cylinder can be used to move the distance of the double-head motor 19 in the cleaning process, so as to pre-treat the nodular cast pipes with different sizes, in the pre-treatment process, the motor 12 can also drive the blower blades 23 and the cleaning bristles 22 to integrally rotate, so as to clean a plurality of positions of the inner wall of the nodular cast pipe, in the cleaning process, the water pump 25 can be used to spray the water inside the second fixed shell 17, so as to clean the inner wall of the nodular cast pipe, a plurality of pre-treatment mechanisms are combined together, because the second electric telescopic cylinder 27 and the brush cylinder 29 are arranged on the first fixed shell 15, the paint can be sprayed to the surface of the brush cylinder 29, the brush cylinder 29 can be used to brush the nodular cast pipe with the paint, and the electrothermal tube can be driven by the electric telescopic cylinder 28 to rotate, so as to brush the inner wall of the nodular cast pipe, so as to finish the drying of the nodular cast pipe, and the drying of the nodular cast pipe can be dried by the electric telescopic cylinder 29, and the electric telescopic cylinder 28 can be moved by the electric telescopic cylinder 29, and the electric telescopic cylinder 28.

In this embodiment, referring to fig. 1, one end of the double-headed motor 19 close to the first fixed shell 15 is connected to a third motor shaft 34, one end of the third motor shaft 34 far from the double-headed motor 19 passes through the second motor protecting cover 18, the second fixed shell 17 and the first fixed shell 15, and both upper and lower ends of the third motor shaft 34 located inside the second fixed shell 17 and the first fixed shell 15 are fixedly connected to a stirring rod 35.

It should be noted that, because the third motor shaft 34 is disposed on the double-head motor 19, the third motor shaft 34 can penetrate through the two fixed shell plates, and in the process of rotating the double-head motor 19, water and paint in the first fixed shell plate 15 and the second fixed shell plate 17 can be simultaneously stirred, so that paint solidification is avoided, and no additional driving mechanism is needed.

In the embodiment, referring to fig. 1, a sealing rubber ring is fixedly connected to a penetrating portion of the third motor shaft 34, the second fixed shell 17 and the first fixed shell 15.

In this embodiment, referring to fig. 1, the top of the first fixed shell 15 and the upper and lower ends of the second fixed shell 17 are both connected with a connecting pipe 36, and the other end of the connecting pipe 36 is rotatably connected with a first pipe cover 37.

In this embodiment, referring to fig. 1, a water receiving casing 6 is connected to the bottom of the device plate 1 by bolts, the water receiving casing 6 is an open structure, the right side of the water receiving casing 6 is communicated with one end of a water outlet pipe 7, and the other end of the water outlet pipe 7 is rotatably connected to a second pipe cover 8.

Referring to fig. 1 in this embodiment, a protective box 2 is bolted to the top of a plate body 1 of the device, a hinge 3 is fixedly connected to the left end of the front side of the protective box 2, and a box baffle 4 is rotatably connected to the front side of the hinge 3.

In the embodiment, referring to fig. 1, the top of the protective box 2 is an open structure, and a cover plate 5 is attached to the top of the protective box 2.

In the embodiment, referring to fig. 1, an electric slip ring 14 penetrates through an outer side of the first motor shaft 13, and the electric slip ring 14 is electrically connected to the first electric telescopic cylinder 16, the second electric telescopic cylinder 27, the water pump 25, the spraying pump 32, the electric heating pipe 28 and the double-head motor 19.

When the pretreatment device for the spraying process of the inner wall of the nodular cast iron pipe is used, it should be noted that the motor 12 and the electric slip ring 14 are electrically connected with an external power supply, then the motor 12, the first electric telescopic cylinder 16, the second electric telescopic cylinder 27, the double-head motor 19, the electric heating pipe 28, the water pump 25 and the coating pump 32 are in signal connection with an external control switch, after the connection is completed, the nodular cast iron pipe is inserted into the first fixed shell plate 15 and the second fixed shell plate 17 from the top of the protective box body 2, after the insertion is completed, the first electric telescopic cylinder 16 is opened, the first electric telescopic cylinder 16 drives the second fixed shell plate 17, the second fixed shell plate 17 drives the double-head motor 19 and the cleaning brush 22 to move to abut against the inner wall of the nodular cast iron pipe, then the motor 12 is opened, the motor 12 drives the first motor shaft 13, the first motor shaft 13 drives the first fixed shell plate 15, the first fixed shell plate 15 drives the double-head motor 19 and the cleaning brush 22 to rotate, the inner wall of the nodular cast tube is cleaned, in the cleaning process, the double-head motor 19 can be opened, the double-head motor 19 drives the second motor shaft 20, the second motor shaft 20 drives the blowing fan blade 23 and the cleaning brush 22 to rotate, so that the inner wall of the nodular cast tube is cleaned in a rotating manner, in the cleaning process, the water pump 25 can be opened, water in the second fixed shell plate 17 is pumped out through the first pipeline 24 and the second pipeline 26, the inner wall of the nodular cast tube is cleaned, after the cleaning is finished, the coating pump 32 is opened, coating in the first fixed shell plate 15 is sprayed on the surface of the brush cylinder 29, then the second electric telescopic cylinder 27 is opened, the position of the brush cylinder 29 is moved by using the second electric telescopic cylinder 27, the brush cylinder 29 is attached to the inner wall of the nodular cast tube, then the motor 12 is opened, the brush cylinder 29 is driven to rotate, so as to brush the inner wall of the nodular cast tube, because the electric heating tube 28 penetrates through the brush cylinder 29, the drying mechanism and the brushing mechanism can be combined together, after coating is finished, the electric heating tube 28 can be used for rotating to dry a plurality of positions on the inner wall of the ball-milled cast tube, the third motor shaft 34 penetrates through the inner parts of the two fixed shell plates, and water and coatings in the first fixed shell plate 15 and the second fixed shell plate 17 can be simultaneously stirred in the rotating process of the double-head motor 19; 2. a protective box body; 3. a hinge; 4. a box body baffle plate; 5. a cover plate; 6. water is received in the shell; 7. a water outlet pipe; 8. a second tube cover; 9. a circular hole; 10. separating the net; 11. a first motor protection cover; 12. a motor; 13. a first motor shaft; 14. an electric slip ring; 15. a first stationary shell plate; 16. a first electric telescopic cylinder; 17. a second stationary shell plate; 18. a second motor protection cover; 19. a double-headed motor; 20. a second motor shaft; 21. fixing the ribbon board; 22. cleaning the bristles; 23. a blower blade; 24. a first conduit; 25. a water pump; 26. a second conduit; 27. a second electric telescopic cylinder; 28. an electric heating tube; 29. a brush cylinder; 30. a limiting block; 31. a third pipeline; 32. a paint pump; 33. a fourth duct 34, a third motor shaft; 35. a stirring rod; 36. a connecting pipe; 37. the first cap, components are all common standard or known to those skilled in the art, and their structure and principle are known to those skilled in the art through technical manuals or through routine experimentation.

Claims

1. The utility model provides a preprocessing device of nodular cast tube inner wall spraying process, includes device plate body (1), its characterized in that: the top of the plate body (1) of the device is provided with a pretreatment mechanism and a spraying mechanism;

the pretreatment mechanism comprises a first fixed shell plate (15), a first electric telescopic cylinder (16), a second fixed shell plate (17), a first motor protective cover (11), a motor (12), a first motor shaft (13), a round hole (9), a separation net (10), a second motor protective cover (18), a double-end motor (19), a second motor shaft (20), a fixed strip plate (21), cleaning bristles (22), a blowing fan blade (23), a first pipeline (24), a water pump (25) and a second pipeline (26); the device plate body (1) is internally provided with a round hole (9), the round hole (9) is internally and fixedly connected with a separation net (10), the bottom of the separation net (10) is in bolted connection with a first motor protective cover (11), the bottom of the first motor protective cover (11) is in bolted connection with a motor (12), the top of the motor (12) is connected with a first motor shaft (13), the top of the first motor shaft (13) penetrates through the separation net (10) and is fixedly connected with a first fixed shell plate (15), the left side and the right side of the first fixed shell plate (15) are in bolted connection with one end of a first electric telescopic cylinder (16) respectively, the other end of the first electric telescopic cylinder (16) is fixedly connected with a second fixed shell plate (17), one end of the second fixed shell plate (17) far away from the first electric telescopic cylinder (16) is in bolted connection with a plurality of second motor protective covers (18) at equal intervals, one end of the second motor protective cover (18) is in bolted connection with a double-headed motor (19), one end of the double-headed motor protective cover (19) far away from a second electric telescopic cylinder (16) is connected with a second motor protective cover (20), one end of the double-headed motor (21) penetrates through a second motor protective cover (21) and is connected with a cleaning slat (21) far away from a second motor shaft (20), a blowing fan blade (23) penetrates through and is fixed at one end of the outer side of the second motor shaft (20), two first pipelines (24) are communicated with one end of the second fixed shell plate (17) at equal intervals, a water pump (25) is communicated with one end, far away from the second fixed shell plate (17), of each first pipeline (24), and a second pipeline (26) is communicated with one end, far away from the first pipeline (24), of each water pump (25);

the spraying mechanism comprises a second electric telescopic cylinder (27), a third pipeline (31), a coating pump (32), a fourth pipeline (33), an electric heating pipe (28), a brush cylinder (29) and a limiting block (30); the bottoms of the front side and the rear side of the first fixed shell plate (15) are both connected with a second electric telescopic cylinder (27) through bolts,

one end of the top of the second electric telescopic cylinder (27) is fixedly connected with an electric heating pipe (28), and the electric heating pipe

(28) The top of the first fixed shell plate penetrates through the brush cylinder (29) and is fixedly connected with a limiting block (30)

(15) The front side and the rear side are communicated with one end of a plurality of third pipelines (31) at equal intervals, and the third pipelines

(31) Is communicated with a paint pump (32), and the paint pump (32) is far away from the third pipeline

(31) One end of the first pipe (33) is communicated with a fourth pipe (33).

2. The pretreatment device for the inner wall spraying process of the ductile cast iron pipe according to claim 1, wherein: double-end motor (19) are close to the one end of first fixed shell board (15) and are connected with third motor shaft (34), second motor safety cover (18), the fixed shell board of second (17) and first fixed shell board (15) are passed to the one end that double-end motor (19) were kept away from in third motor shaft (34), and third motor shaft (34) are located the equal fixedly connected with in upper and lower both ends of the fixed shell board of second (17) and first fixed shell board (15) inside and stir pole (35).

3. The pretreatment device for the inner wall spraying process of the ductile cast iron pipe according to claim 2, wherein: and a sealing rubber ring is fixedly connected at the penetrating part of the third motor shaft (34) and the second fixed shell plate (17) and the first fixed shell plate (15).

4. The pretreatment device for the inner wall spraying process of the ductile cast iron pipe according to claim 1, wherein: the top of the first fixed shell plate (15) and the upper end and the lower end of the second fixed shell plate (17) are both communicated with a connecting pipe (36), and the other end of the connecting pipe (36) is rotatably connected with a first pipe cover (37).

5. The pretreatment device for the inner wall spraying process of the ductile cast iron pipe according to claim 1, wherein: the device plate body (1) bottom bolted connection has water receiving casing (6), and water receiving casing (6) are open structure, water receiving casing (6) right side intercommunication has one end of outlet pipe (7), the other end of outlet pipe (7) rotates and is connected with second tube cap (8).

6. The pretreatment device for the inner wall spraying process of the ductile cast iron pipe according to claim 1, wherein: the device plate body (1) top bolted connection has protection box (2), protection box (2) front side left end fixedly connected with hinge (3), hinge (3) front side rotation is connected with box baffle (4).

7. The pretreatment device for the inner wall spraying process of the ductile cast iron pipe according to claim 6, wherein: the top of the protection box body (2) is of an open structure, and a cover plate (5) is attached to the top of the protection box body (2).

8. The pretreatment device for the inner wall spraying process of the ductile cast iron pipe according to claim 1, wherein: an electric slip ring (14) penetrates through the outer side of the first motor shaft (13), and the electric slip ring (14) is electrically connected with the first electric telescopic cylinder (16), the second electric telescopic cylinder (27), the water pump (25), the coating pump (32), the electric heating pipe (28) and the double-head motor (19).