Surface spraying process and spraying device for rock shield pipe

Abstract

The present invention discloses a surface spraying process for a rock shield pipe, comprising the following steps: a jacking assembly supports and rotates the rock shield pipe blank from both ends; a spraying carriage moves laterally from one end of the rock shield pipe blank to the other, and a glue-applying assembly on the spraying carriage rolls glue onto the surface of the rock shield pipe blank; a film-spraying assembly on the spraying carriage sprays a composite coating onto the surface of the rock shield pipe blank, allowing the composite coating to adhere to the outside of the glue after spraying; and a smoothing assembly applies the composite coating to the surface of the rock shield pipe blank, smoothing the surface undulations formed after spraying until the composite coating has a uniform thickness. This invention can effectively improve the adhesion stability and smoothness of the composite coating on the rock shield pipe surface.

Description

Technical Field

[0001] The invention relates to a rock shield pipe processing device, in particular to a surface spraying process and a spraying device for a rock shield pipe. Background Art

[0002] Compared to traditional ductile iron pipes, rock shield pipes are laid using directional drilling, which exposes them to scratches from underground rocks and other hard objects during the laying process. This can easily cause scratches on the pipe surface and reduce the stability of the ductile iron pipe. To address this issue, manufacturers are currently using composite coatings instead of paint to spray on the surface of ductile iron pipes. After curing, the composite coating forms a high-hardness composite coating that protects the ductile iron pipe and reduces scratches on the pipe.

[0003] However, the defect of this structure is that the adhesion and leveling of the existing composite coating are worse than those of paint, and the thickness of the composite coating on the surface of the ductile iron pipe is greater than that of the paint. On the one hand, the composite coating cannot stably adhere to the surface of the ductile iron pipe after spraying. On the other hand, the composite coating will form granular undulations on the surface of the ductile iron pipe after spraying, thereby reducing the smoothness of the rock shield pipe surface and the stability during subsequent drilling and laying of the pipe.

[0004] Therefore, the composite coating on the surface of the existing rock shield pipe has the problems of poor adhesion stability and low smoothness. Summary of the Invention

[0005] The purpose of the present invention is to provide a surface spraying process and a spraying device for a rock shield pipe, which can effectively improve the adhesion stability and smoothness of the composite coating on the surface of the rock shield pipe.

[0006] The technical solution of the present invention is a surface spraying process for a rock shield pipe, comprising the following steps:

[0007] ① The jacking assembly supports and drives the rock shield pipe from both ends;

[0008] ② The spraying trolley moves horizontally from one end of the rock shield tube to the other end, and the glue coating component on the spraying trolley rolls and brushes glue on the surface of the rock shield tube;

[0009] ③ The spraying assembly on the spraying trolley sprays the composite coating on the surface of the rock shield tube blank, so that the composite coating adheres to the outside of the glue after spraying;

[0010] ④ The composite coating is applied to the surface of the rock shield tube blank by the leveling component, so that the composite coating is applied to a uniform thickness on the surface undulations formed after spraying.

[0011] In the aforementioned surface spraying process for a rock shield pipe, when applying the smoothing component in step ④, the composite coating on the surface of the rock shield pipe blank is first pre-scraped to remove excess composite coating on the surface of the rock shield pipe blank, and then the pre-scraped composite coating is evenly spread to remove linear protrusions formed on the surface of the composite coating after pre-scraping, so that the surface of the composite coating forms a smooth surface after being evenly spread.

[0012] A spraying device used in the surface spraying process of a rock shield pipe based on the aforementioned method includes a spraying track, a spraying trolley is slidably connected to the spraying track, and the spraying trolley is respectively provided with a glue coating component, a film spraying component and a smoothing component, and a top pipe component is provided on one side of the spraying track; the glue coating component includes a glue coating frame, the glue coating frame is rotatably connected to a swing frame, the swing frame is connected to a glue feed pipe, the end of the glue feed pipe extends to the outside of the swing frame and is connected to a roller brush sleeve, the roller brush sleeve is arranged on the outside of the glue feed pipe and forms a glue cavity for accommodating glue between the roller brush sleeve and the glue feed pipe, a plurality of first glue penetration holes are distributed on the surface of the roller brush sleeve, the outer sleeve of the glue cavity is provided with a flexible roller brush, and the flexible roller brush is provided with a second glue penetration hole that matches the first glue penetration hole.

[0013] In the aforementioned spraying device, the roller brush sleeve is fixedly connected to the rubber inlet pipe, and the two ends of the flexible roller brush are rotatably connected to the outside of the roller brush sleeve through the pressure plate. The side wall of the pressure plate and the roller brush sleeve are partially fitted together, and a material accumulation groove is formed between the pressure plate, the flexible roller brush and the roller brush sleeve.

[0014] In the aforementioned spraying device, a hollow sleeve is provided on the inner side of the flexible roller brush, and the pressure plate is provided with an annular sealing ring on the side close to the roller brush sleeve. The inner wall of the sealing ring and the side wall of the roller brush sleeve fit together, and the outer end of the sealing ring fits together with the inner hole of the sleeve.

[0015] In the aforementioned spraying device, a threaded hole is provided on the pressure plate on the inner side of the sealing ring.

[0016] In the aforementioned spraying device, the lower end of the swing frame is connected to a driving cylinder.

[0017] In the aforementioned spraying device, the film spraying assembly includes a film spraying frame located on the spraying trolley, a first transverse seat is slidably connected to the film spraying frame, and a spraying pipe is connected to the outside of the first transverse seat.

[0018] In the aforementioned spraying device, the smoothing assembly includes a smoothing frame located on the spraying trolley, the smoothing frame is slidably connected to a second transverse seat, and the end of the second transverse seat is provided with a scraper that fits the rock shield pipe blank.

[0019] In the aforementioned spraying device, the scraper has an arc-shaped shape, and forms a first contact surface in the middle of the scraper near the rock shield tube blank. The top of the scraper is separated from the rock shield tube blank and is connected to an atomizing tube for spraying atomized water on the surface of the rock shield tube blank; the atomizing tube and the spraying track are arranged parallel to each other, and the atomizing tube is provided with a plurality of atomizing nozzles spaced apart on the side facing the rock shield tube blank.

[0020] In the aforementioned spraying device, a material equalizing plate is detachably connected to the scraper above the contact surface, and the outer end of the material equalizing plate forms a second arc-shaped contact surface. The material equalizing plate is arranged to be inclined downward along the conveying direction of the spraying trolley, and the upper end of the material equalizing plate is located in the middle of the scraper in the horizontal direction. An opening is provided on the scraper on one side of the material equalizing plate for the material equalizing plate to pass through.

[0021] In the aforementioned spraying device, an inclined guide plate is provided on one side of the material uniformity plate, the height of the guide plate gradually decreases toward the opening, the end of the guide plate passes through the opening and is detachably connected to the scraper, and a material accumulation trough is provided on one side of the scraper below the opening.

[0022] Compared with the prior art, the present invention has the following characteristics:

[0023] (1) The present invention sprays glue and composite coating on the surface of the rock shield tube in sequence, so that the glue can adhere the composite coating to the surface of the rock shield tube after coating, thereby improving the adhesion stability of the composite coating; by smoothing the surface of the composite coating, the surface smoothness of the rock shield tube after the composite coating is cured can be effectively improved, avoiding the undulations caused by spraying;

[0024] (2) By pre-scraping and then smoothing, the protruding part of the composite coating on the rock shield tube can be removed by pre-scraping, thereby preventing this part of the coating from continuously accumulating and forming linear protrusions during the subsequent smoothing process, which effectively improves the smoothing effect of the composite coating;

[0025] (3) On this basis, the present invention defines the structure of the spraying device so that the gluing, spraying and smoothing processes of the rock shield tube blank can be completed sequentially during one feeding process of the spraying trolley, thereby effectively improving its spraying efficiency;

[0026] (4) By limiting the installation structure of the flexible roller brush, the contact part of the glue and the rotation connection part of the flexible roller brush can be separated from each other, thereby effectively preventing the problem that the flexible roller brush cannot rotate after being glued; on the other hand, when the second glue hole on the surface of the flexible roller brush is clogged due to adhesion after long-term use, the manufacturer can replace it, thereby improving the use stability of the flexible roller brush and facilitating the operation of the operator;

[0027] (5) Through the structural coordination of the scraper and the atomizing nozzle, the scraper can spray atomized water on the surface of the composite coating before applying the composite coating, thereby softening the composite coating and improving its pre-scraping and smoothing effect;

[0028] (6) By limiting the structure of the material distribution plate, the composite coating can also accumulate on the top of the material distribution plate during the pre-scraping process and flow out from the other side of the scraper along the material distribution plate, thereby effectively preventing the composite coating from overflowing the material distribution plate after continuous accumulation and flowing onto the surface of the rock shield tube to form linear protrusions, further improving the subsequent scraper's smoothing effect on the composite coating;

[0029] Therefore, the present invention can effectively improve the adhesion stability and smoothness of the composite coating on the surface of the rock shield pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 Example 1 Figure 1 A-direction enlarged view;

[0032] Figure 3 It is a structural diagram of the glue coating component;

[0033] Figure 4 is a diagram showing the connection structure of the flexible roller brush in Example 1;

[0034] Figure 5 is a diagram showing the connection structure of the flexible roller brush in Example 2;

[0035] Figure 6 Schematic diagram of the structure of the scraper in Example 3;

[0036] Figure 7 This is a front view of the scraper in Example 3.

[0037] The marks in the accompanying drawings are: 1-spraying track, 2-spraying trolley, 3-glue coating assembly, 4-film spraying assembly, 5-smoothing assembly, 6-top pipe assembly, 7-glue coating rack, 8-swing rack, 9-glue inlet pipe, 10-roller brush sleeve, 11-glue cavity, 12-first glue penetration hole, 13-flexible roller brush, 14-second glue penetration hole, 15-pressing plate, 16-material accumulation trough, 17-sealing ring, 18-film spraying rack, 19-first transverse movement seat, 20-spraying pipe, 21-smoothing rack, 22-second transverse movement seat, 23-scraper, 24-first contact surface, 25-atomizing pipe, 26-material equalizing plate, 27-second contact surface, 28-opening, 29-guide plate. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0039] Example 1. A surface spraying process for a rock shield pipe comprises the following steps:

[0040] ① The jacking assembly supports and drives the rock shield pipe from both ends;

[0041] ② The spraying trolley moves horizontally from one end of the rock shield tube to the other end, and the glue coating component on the spraying trolley rolls glue on the surface of the rock shield tube. The glue can be solvent-free epoxy resin paint;

[0042] ③ The spray film assembly on the spraying trolley sprays the composite coating on the surface of the rock shield pipe blank so that the composite coating adheres to the outside of the glue after spraying. The composite coating is a conventional composite coating used for rock shield pipes, mainly made of cement, fine sand, boric acid, stabilizer and retarder as raw materials;

[0043] ④ The composite coating is applied to the surface of the rock shield tube blank by the leveling component, so that the composite coating is applied to a uniform thickness on the surface undulations formed after spraying.

[0044] The spraying device used in the surface spraying process of the rock shield pipe is composed of Figure 1-4 As shown, it includes a spraying track 1, a spraying trolley 2 is slidably connected to the spraying track 1, and the spraying trolley 2 can be driven by a motor to move laterally on the spraying track 1. The spraying trolley 2 is respectively provided with a glue coating component 3, a film spraying component 4 and a smoothing component 5. A jacking component 6 is provided on one side of the spraying track 1. The jacking component 6 is a conventional jacking device for ductile iron pipes, which is used to clamp and drive the rotation of both ends of the rock shield pipe blank;

[0045] The glue coating assembly 3 includes a glue coating frame 7, which is rotatably connected to a swing frame 8. The lower end of the swing frame 8 is connected to a driving cylinder, and the top of the swing frame 8 is connected to a glue inlet pipe 9. The glue inlet pipe 9 is a rigid pipe. One end of the glue inlet pipe 9 is connected to a glue outlet mechanism for conveying glue to the glue inlet pipe 9 through a flexible pipe. The other end of the glue inlet pipe 9 extends to the outside of the swing frame 8 and is connected to a roller brush sleeve 10. The roller brush sleeve 10 is sleeved on the outside of the glue inlet pipe 9 and forms a glue cavity 11 for accommodating glue between the roller brush sleeve 10 and the glue inlet pipe 9. A plurality of first glue transmission holes 12 are distributed on the surface of the roller brush sleeve 10, and a flexible roller brush 13 is provided on the outer side of the glue cavity 11. The flexible roller brush 13 is provided with a second glue transmission hole 14 that matches the first glue transmission hole 12. The roller brush sleeve 10 is rotatably connected to the glue inlet pipe 9, and the flexible roller brush 13 is covered on the surface of the roller brush sleeve 10 and fixed.

[0046] During use, the glue discharging mechanism fills the glue cavity 11 with glue, and the glue in the glue cavity 11 flows through the first glue hole 12 and the second glue hole 14 to the flexible roller brush 13 under the action of extrusion; the flexible roller brush 13 rotates in coordination with the rock shield tube blank after being soaked in glue, so that the glue is coated on the surface of the rock shield tube blank during the rotation process.

[0047] The film spraying assembly 4 includes a film spraying frame 18 located on the spraying trolley 2, and a first transverse seat 19 is slidably connected to the film spraying frame 18. The first transverse seat 19 and the film spraying frame 18 are connected to each other via a screw drive mechanism, and the first transverse seat 19 is driven by the screw to move back and forth on the film spraying frame 18; the outside of the first transverse seat 19 is connected to a spraying pipe 20; one end of the spraying pipe 20 is tilted downward toward the side wall of the rock shield tube blank, and the other end of the spraying pipe 20 is connected to a discharge mechanism for conveying paint to the spraying pipe 20; the transverse position of the first transverse seat 19 is adjusted according to the diameter of the rock shield tube blank, so that the paint sprayed from the spraying pipe 20 is stably adhered to the surface of the rock shield tube blank.

[0048] The smoothing assembly 5 includes a smoothing frame 21 located on the spraying trolley 2, and a second transverse seat 22 is slidably connected to the smoothing frame 21. The second transverse seat 22 and the smoothing frame 21 are connected to each other via a screw drive mechanism. The second transverse seat 22 is driven by a motor to move back and forth on the smoothing frame 21. A scraper 23 is provided at the end of the second transverse seat 22 to fit the rock shield pipe blank. The transverse position of the second transverse seat 22 is adjusted according to the diameter of the rock shield pipe blank, so that the scraper 23 fits the composite coating layer on the surface of the rock shield pipe blank after it is in place.

[0049] The scraper 23 has an arc-shaped shape. A first contact surface 24 is formed in the middle of the scraper 23 on one side close to the rock shield tube blank. The top of the scraper 23 is separated from the rock shield tube blank and is connected to an atomizing pipe 25 for spraying atomized water on the surface of the rock shield tube blank. The atomizing pipe 25 and the spraying track 1 are arranged parallel to each other. The atomizing pipe 25 has a plurality of atomizing nozzles spaced apart on the side facing the rock shield tube blank, each of which faces the side wall of the rock shield tube blank. One end of the atomizing pipe 25 is closed, and the other end of the atomizing pipe 25 is connected to a water outlet mechanism for conveying water to the atomizing pipe 25. When in use, the atomizing pipe 25 on the top of the scraper 23 first sprays atomized water evenly on the coating surface of the rock shield tube blank, and then the top pipe assembly 6 drives the rock shield tube blank sprayed with atomized water to rotate until it is in contact with the first contact surface 24 of the scraper 23, so that the scraper 23 is used to evenly apply the undulations on the coating surface formed by spraying to form a coating layer of fixed thickness.

[0050] During use, this embodiment first clamps and rotates the shield tube blank at both ends by the jacking assembly 6. The spray carriage 2 then moves along the length of the shield tube blank from one end to the other. As the spray carriage 2 moves, the glue coating assembly 3 evenly applies glue to the shield tube blank's surface via a flexible roller brush 13. The film spraying assembly 4 then sprays the composite coating evenly onto the shield tube blank, ensuring the composite coating adheres stably to the shield tube blank under the action of the glue. After the composite coating is sprayed, the scraper 23 at the rear evenly spreads the composite coating onto the shield tube blank as it rotates, forming a composite coating of a specified thickness and improving its surface smoothness.

[0051] Example 2. Spraying device, composed as follows Figure 1 and 5 As shown, it includes a spraying track 1, a spraying trolley 2 is slidably connected to the spraying track 1, and the spraying trolley 2 can be driven by a motor to move laterally on the spraying track 1. The spraying trolley 2 is respectively provided with a glue coating component 3, a film spraying component 4 and a smoothing component 5. A jacking component 6 is provided on one side of the spraying track 1. The jacking component 6 is a conventional jacking device for ductile iron pipes, which is used to clamp and drive the rotation of both ends of the rock shield pipe blank;

[0052] The glue coating assembly 3 includes a glue coating frame 7, which is rotatably connected to a swing frame 8. The lower end of the swing frame 8 is connected to a driving cylinder, and the top of the swing frame 8 is connected to a glue feed pipe 9. The glue feed pipe 9 is a rigid pipe. One end of the glue feed pipe 9 is connected to a glue discharge mechanism for conveying glue to the glue feed pipe 9 through a flexible pipe. The other end of the glue feed pipe 9 extends to the outside of the swing frame 8 and is connected to a roller brush cover 10. The roller brush cover 10 is sleeved on the outside of the glue feed pipe 9 and forms a glue cavity 11 for accommodating glue between the glue cavity 11 and the glue feed pipe 9. The holes are interconnected, and a plurality of first glue-permeable holes 12 are distributed on the surface of the roller brush sleeve 10. A flexible roller brush 13 is provided on the outer sleeve of the glue cavity 11, and a second glue-permeable hole 14 is provided on the flexible roller brush 13 to match the first glue-permeable hole 12. When in use, the glue cavity 11 is filled with glue by the glue discharging mechanism, and the glue in the glue cavity 11 passes through the first glue-permeable hole 12 and the second glue-permeable hole 14 under the action of extrusion to flow to the flexible roller brush 13. After being soaked in glue, the flexible roller brush 13 rotates in coordination with the rock shield tube blank, so that the glue is coated on the surface of the rock shield tube blank during the rotation process.

[0053] The roller brush sleeve 10 is fixedly connected to the rubber inlet pipe 9, and the two ends of the flexible roller brush 13 are rotatably connected to the outside of the roller brush sleeve 10 through the pressure plate 15. A shaft retaining ring can be set on the outside of the pressure plate 15 for limiting. The side wall of the pressure plate 15 and the roller brush sleeve 10 are partially fitted together, and a material accumulation groove 16 is formed between the pressure plate 15, the flexible roller brush 13 and the roller brush sleeve 10.

[0054] The rubber inlet pipe 9 forms a detachable structure at one end close to the roller brush cover 10, or the pressure plate 15 forms a split structure and can be separated from both sides of the rubber inlet pipe 9, thereby facilitating the installation and removal of the inner pressure plate 15.

[0055] A hollow sleeve is provided on the inner side of the flexible roller brush 13, and an annular sealing ring 17 is provided on the side of the pressure plate 15 close to the roller brush cover 10. The inner wall of the sealing ring 17 and the side wall of the roller brush cover 10 fit together, and the outer end of the sealing ring 17 fits together with the inner hole of the sleeve.

[0056] The film spraying assembly 4 includes a film spraying frame 18 located on the spraying trolley 2, and a first transverse seat 19 is slidably connected to the film spraying frame 18. The first transverse seat 19 and the film spraying frame 18 are connected to each other via a screw drive mechanism, and the first transverse seat 19 is driven by the screw to move back and forth on the film spraying frame 18; the outside of the first transverse seat 19 is connected to a spraying pipe 20; one end of the spraying pipe 20 is tilted downward toward the side wall of the rock shield tube blank, and the other end of the spraying pipe 20 is connected to a discharge mechanism for conveying paint to the spraying pipe 20; the transverse position of the first transverse seat 19 is adjusted according to the diameter of the rock shield tube blank, so that the paint sprayed from the spraying pipe 20 is stably adhered to the surface of the rock shield tube blank.

[0057] The smoothing assembly 5 includes a smoothing frame 21 located on the spraying trolley 2, and a second transverse seat 22 is slidably connected to the smoothing frame 21. The second transverse seat 22 and the smoothing frame 21 are connected to each other via a screw drive mechanism. The second transverse seat 22 is driven by a motor to move back and forth on the smoothing frame 21. A scraper 23 is provided at the end of the second transverse seat 22 to fit the rock shield pipe blank. The transverse position of the second transverse seat 22 is adjusted according to the diameter of the rock shield pipe blank, so that the scraper 23 fits the composite coating layer on the surface of the rock shield pipe blank after it is in place.

[0058] The scraper 23 has an arc-shaped shape. A first contact surface 24 is formed in the middle of the scraper 23 on one side close to the rock shield tube blank. The top of the scraper 23 is separated from the rock shield tube blank and is connected to an atomizing pipe 25 for spraying atomized water on the surface of the rock shield tube blank. The atomizing pipe 25 and the spraying track 1 are arranged parallel to each other. The atomizing pipe 25 has a plurality of atomizing nozzles spaced apart on the side facing the rock shield tube blank, each of which faces the side wall of the rock shield tube blank. One end of the atomizing pipe 25 is closed, and the other end of the atomizing pipe 25 is connected to a water outlet mechanism for conveying water to the atomizing pipe 25. When in use, the atomizing pipe 25 on the top of the scraper 23 first sprays atomized water evenly on the coating surface of the rock shield tube blank, and then the top pipe assembly 6 drives the rock shield tube blank sprayed with atomized water to rotate until it is in contact with the first contact surface 24 of the scraper 23, so that the scraper 23 is used to evenly apply the undulations on the coating surface formed by spraying to form a coating layer of fixed thickness.

[0059] Compared with Example 1, this embodiment further optimizes the installation structure of the flexible roller brush 13, so that the flexible roller brush 13 can be first sleeved on the outside of the roller brush cover 10 and separated from the roller brush cover 10 during installation, and then the pressure plate 15 is fastened to the flexible roller brush 13 from both ends, and the inner side of the pressure plate 15 is rotatably connected to the glue inlet pipe 9. During use, the glue in the glue cavity 11 is filled into the material accumulation groove 16 through the first glue permeation hole 12 and is sealed by the sealing rings 11 on both sides, so that the glue flows through the second glue permeation hole 14 to the surface of the flexible roller brush 13 under the subsequent extrusion action, so that the flexible roller brush 13 can be rolled on the rock shield pipe blank after being soaked with glue; under the above cooperation, the glue can be separated from the rotating connection part of the pressure plate 15 during the flow process, thereby effectively avoiding the problem that the flexible roller brush 13 cannot rotate due to the adhesion between the pressure plate 15 and the glue inlet pipe 9.

[0060] If the bristles of the flexible roller brush 13 solidify or the second glue hole 14 becomes clogged after long-term use, the operator can screw a bolt into the threaded hole to apply an outward squeezing force to the pressure plate 15, causing the pressure plate 15 to separate from the roller brush cover 10 under the squeezing action, thereby releasing the fastening fixation of the flexible roller brush 13, thereby achieving replacement of the flexible roller brush 13. After removing the flexible roller brush 13, the operator can also clean the first glue hole 12, thereby preventing the first glue hole 12 from being clogged, further improving the stability of the present embodiment.

[0061] Example 3. A surface spraying process for a rock shield pipe, comprising the following steps:

[0062] ① The jacking assembly supports and drives the rock shield pipe from both ends;

[0063] ② The spraying trolley moves horizontally from one end of the rock shield tube to the other end, and the glue coating component on the spraying trolley rolls glue on the surface of the rock shield tube. The glue can be solvent-free epoxy resin paint;

[0064] ③ The spraying assembly on the spraying trolley sprays the composite coating on the surface of the rock shield tube blank, so that the composite coating adheres to the outside of the glue after spraying;

[0065] ④ The composite coating is applied to the surface of the rock shield tube blank by the leveling component, so that the composite coating is applied to a uniform thickness on the surface undulations formed after spraying.

[0066] When applying the smoothing component in step ④, the composite coating on the surface of the rock shield tube blank is pre-scraped to remove excess composite coating on the surface of the rock shield tube blank, and then the pre-scraped composite coating is evenly spread to remove linear protrusions formed on the surface of the composite coating after pre-scraping, so that the surface of the composite coating forms a smooth surface after being evenly spread.

[0067] The spraying device used in the surface spraying process of the rock shield pipe is composed of Figure 1 、 6 As shown in Figure 7, it includes a spraying track 1, a spraying trolley 2 is slidably connected to the spraying track 1, and the spraying trolley 2 can be driven by a motor to move laterally on the spraying track 1. The spraying trolley 2 is respectively provided with a glue coating component 3, a film spraying component 4 and a smoothing component 5. A jacking component 6 is provided on one side of the spraying track 1. The jacking component 6 is a conventional jacking device for ductile iron pipes, which is used to clamp and drive the rotation of both ends of the rock shield pipe blank;

[0068] The glue coating assembly 3 includes a glue coating frame 7, which is rotatably connected to a swing frame 8. The lower end of the swing frame 8 is connected to a driving cylinder, and the top of the swing frame 8 is connected to a glue feed pipe 9. The glue feed pipe 9 is a rigid pipe. One end of the glue feed pipe 9 is connected to a glue discharge mechanism for conveying glue to the glue feed pipe 9 through a flexible pipe. The other end of the glue feed pipe 9 extends to the outside of the swing frame 8 and is connected to a roller brush cover 10. The roller brush cover 10 is sleeved on the outside of the glue feed pipe 9 and forms a glue cavity 11 for accommodating glue between the roller brush cover and the glue feed pipe 9. A plurality of first glue-permeable holes 12 are distributed on the surface of the sleeve 10, and a flexible roller brush 13 is provided on the outer sleeve of the glue cavity 11. The flexible roller brush 13 is provided with a second glue-permeable hole 14 that matches the first glue-permeable hole 12. When in use, the glue discharging mechanism fills the glue cavity 11 with glue, and the glue in the glue cavity 11 passes through the first glue-permeable holes 12 and the second glue-permeable holes 14 under the action of extrusion to flow to the flexible roller brush 13. After being soaked in glue, the flexible roller brush 13 rotates in coordination with the rock shield tube blank, so that the glue is coated on the surface of the rock shield tube blank during the rotation process.

[0069] The roller brush cover 10 is rotatably connected to the rubber inlet pipe 9 , and the flexible roller brush 13 is covered on the surface of the roller brush cover 10 and fixed.

[0070] The film spraying assembly 4 includes a film spraying frame 18 located on the spraying trolley 2, and a first transverse seat 19 is slidably connected to the film spraying frame 18. The first transverse seat 19 and the film spraying frame 18 are connected to each other via a screw drive mechanism, and the first transverse seat 19 is driven by the screw to move back and forth on the film spraying frame 18; the outside of the first transverse seat 19 is connected to a spraying pipe 20; one end of the spraying pipe 20 is tilted downward toward the side wall of the rock shield tube blank, and the other end of the spraying pipe 20 is connected to a discharge mechanism for conveying paint to the spraying pipe 20; the transverse position of the first transverse seat 19 is adjusted according to the diameter of the rock shield tube blank, so that the paint sprayed from the spraying pipe 20 is stably adhered to the surface of the rock shield tube blank.

[0071] The smoothing assembly 5 includes a smoothing frame 21 located on the spraying trolley 2, and a second transverse seat 22 is slidably connected to the smoothing frame 21. The second transverse seat 22 and the smoothing frame 21 are connected to each other via a screw drive mechanism. The second transverse seat 22 is driven by a motor to move back and forth on the smoothing frame 21. A scraper 23 is provided at the end of the second transverse seat 22 to fit the rock shield pipe blank. The transverse position of the second transverse seat 22 is adjusted according to the diameter of the rock shield pipe blank, so that the scraper 23 fits the composite coating layer on the surface of the rock shield pipe blank after it is in place.

[0072] The scraper 23 has an arc-shaped shape. A first contact surface 24 is formed in the middle of the scraper 23 on one side close to the rock shield tube blank. The top of the scraper 23 is separated from the rock shield tube blank and is connected to an atomizing pipe 25 for spraying atomized water on the surface of the rock shield tube blank. The atomizing pipe 25 and the spraying track 1 are arranged parallel to each other. The atomizing pipe 25 has a plurality of atomizing nozzles spaced apart on the side facing the rock shield tube blank, each of which faces the side wall of the rock shield tube blank. One end of the atomizing pipe 25 is closed, and the other end of the atomizing pipe 25 is connected to a water outlet mechanism for conveying water to the atomizing pipe 25. When in use, the atomizing pipe 25 on the top of the scraper 23 first sprays atomized water evenly on the coating surface of the rock shield tube blank, and then the top pipe assembly 6 drives the rock shield tube blank sprayed with atomized water to rotate until it is in contact with the first contact surface 24 of the scraper 23, so that the scraper 23 is used to evenly apply the undulations on the coating surface formed by spraying to form a coating layer of fixed thickness.

[0073] A material balancing plate 26 is detachably connected to the scraper 23 above the contact surface, and the outer end of the material balancing plate 26 forms an arc-shaped second contact surface 27. The distances from each position of the second contact surface 27 to the surface of the rock shield pipe are equal. The material balancing plate 26 is arranged to be inclined downward along the conveying direction of the spraying trolley 2, and the upper end of the material balancing plate 26 is located in the middle of the scraper 23 in the horizontal direction. An opening 28 for the material balancing plate 26 to pass through is provided on the scraper 23 on one side of the material balancing plate 26.

[0074] An inclined guide plate 29 is provided on one side of the material balancing plate 26. The height of the guide plate 29 gradually decreases toward the opening 28. The end of the guide plate 29 passes through the opening 28 and is detachably connected to the scraper 23. A material accumulation trough 16 is provided on one side of the scraper 23 below the opening 28.

[0075] Because the composite coating in Example 1 forms undulations on the surface of the shield tube after spraying, the scraper 23 inevitably squeezes and scrapes away the composite coating from the protruding areas during the smoothing process. This causes the scraped composite coating to accumulate in the gap between the top of the first contact surface 24 and the top of the shield tube. If the composite coating accumulates excessively, it can overflow from both ends of the first contact surface 24 and flow onto the shield tube, resulting in spiral raised lines on the composite coating surface. These lines need to be scraped away by the operator after the spraying process is completed.

[0076] In response to the above-mentioned defects, this embodiment further optimizes the structure of the smoothing component 5, so that the smoothing component 5 can apply the composite coating in two steps during the treatment process, that is, first the raised parts of the composite coating are scraped off by the material-leveling plate 26, and then the composite coating is evenly spread by the first contact surface 24, thereby effectively reducing the amount of material accumulation generated by the first contact surface 24 during the evenly spread process. At the same time, the first contact surface 24 can also use the accumulated material to fill the concave parts of the composite coating during the application process, so that the accumulated material at the first contact surface 24 can be kept within a small range, reducing the possibility of overflow from both sides. With the above-mentioned coordination, after the spraying process is completed, the rock shield pipe will only have a small number of pits or linear protrusions in local locations, and will not form obvious spiral protrusions, thereby greatly reducing the subsequent repair workload of the operators.

[0077] By limiting the structure of the material balancing plate 26, the scraped composite coating can accumulate on the surface of the material balancing plate 26 and flow along the inclined material balancing plate 26 to the opening 28, and flow out along the back of the scraper 23, thereby effectively reducing the composite coating from overflowing from the top of the material balancing plate 26 and flowing back to the rock shield tube blank, thereby ensuring the smoothing effect of this embodiment.

Claims

1. A surface spraying process for a rock shield pipe, characterized in that: The following steps are involved: ① The jacking assembly supports and drives the rock shield pipe from both ends; ② The spraying trolley moves horizontally from one end of the rock shield tube to the other end, and the glue coating component on the spraying trolley rolls and brushes glue on the surface of the rock shield tube; ③ The spraying assembly on the spraying trolley sprays the composite coating on the surface of the rock shield tube blank, so that the composite coating adheres to the outside of the glue after spraying; ④ The composite coating is applied to the surface of the rock shield tube by the leveling component, so that the composite coating is applied to a uniform thickness on the surface undulations formed after spraying; When applying the smoothing component in step ④, the composite coating on the surface of the rock shield tube blank is pre-scraped to remove excess composite coating on the surface of the rock shield tube blank, and then the pre-scraped composite coating is evenly spread to remove linear protrusions formed on the surface of the composite coating after pre-scraping, so that the surface of the composite coating forms a smooth surface after being evenly spread.

2. A spraying device for a surface spraying process of a rock shield pipe according to claim 1, characterized in that: The invention comprises a spraying track (1), a spraying trolley (2) being slidably connected to the spraying track (1), a glue coating assembly (3), a film spraying assembly (4) and a smoothing assembly (5) being respectively provided on the spraying trolley (2), and a top pipe assembly (6) being provided on one side of the spraying track (1); the glue coating assembly (3) comprising a glue coating frame (7), a swing frame (8) being rotatably connected to the glue coating frame (7), a glue feed pipe (9) being connected to the swing frame (8), an end of the glue feed pipe (9) extending to the outside of the swing frame (8) and being connected to a roller brush sleeve (10), the roller brush sleeve (10) being sleeved on the outside of the glue feed pipe (9) and forming a glue cavity (11) for accommodating glue between the roller brush sleeve (10) and the glue feed pipe (9), a plurality of first glue penetration holes (12) being distributed on the surface of the roller brush sleeve (10), a flexible roller brush (13) being sleeved on the outside of the glue cavity (11), and a second glue penetration hole (14) being matched with the first glue penetration hole (12) being provided on the flexible roller brush (13).

3. The spraying device according to claim 2, characterized in that: The roller brush cover (10) is fixedly connected to the rubber inlet pipe (9), and both ends of the flexible roller brush (13) are rotatably connected to the outside of the roller brush cover (10) via a pressure plate (15). The side wall of the pressure plate (15) and the roller brush cover (10) are partially fitted together, and a material accumulation groove (16) is formed between the pressure plate (15), the flexible roller brush (13) and the roller brush cover (10).

4. The spraying device according to claim 3, characterized in that: A hollow sleeve is provided on the inner side of the flexible roller brush (13), and an annular sealing ring (17) is provided on the side of the pressure plate (15) close to the roller brush cover (10). The inner wall of the sealing ring (17) and the side wall of the roller brush cover (10) are in contact with each other, and the outer end of the sealing ring (17) is in contact with the inner hole of the sleeve.

5. The spraying device according to claim 2, characterized in that: The film spraying assembly (4) comprises a film spraying frame (18) located on the spraying trolley (2), a first transverse seat (19) being slidably connected to the film spraying frame (18), and a spraying pipe (20) being externally connected to the first transverse seat (19).

6. The spraying device according to claim 2, characterized in that: The smoothing assembly (5) comprises a smoothing frame (21) located on the spraying trolley (2), a second transverse seat (22) being slidably connected to the smoothing frame (21), and a scraper (23) that fits the rock shield tube blank is provided at the end of the second transverse seat (22).

7. The spraying device according to claim 6, characterized in that: The scraper (23) has an arc shape, and the scraper (23) forms a first contact surface (24) in the middle of one side close to the rock shield tube blank. The top of the scraper (23) is separated from the rock shield tube blank and is connected to an atomizing pipe (25) for spraying atomized water on the surface of the rock shield tube blank. The atomizing pipe (25) and the spraying track (1) are arranged parallel to each other, and the atomizing pipe (25) is provided with a plurality of atomizing nozzles spaced apart on the side facing the rock shield tube blank.

8. The spraying device according to claim 7, characterized in that: A material balancing plate (26) is detachably connected to the scraper (23) above the contact surface, and the outer end of the material balancing plate (26) forms a second arc-shaped contact surface (27). The material balancing plate (26) is arranged to be inclined downward along the conveying direction of the spraying trolley (2), and the upper end of the material balancing plate (26) is located in the middle of the scraper (23) in the horizontal direction. An opening (28) for the material balancing plate (26) to pass through is provided on the scraper (23) on one side of the material balancing plate (26).

9. The spraying device according to claim 8, characterized in that: An inclined guide plate (29) is provided on one side of the material distribution plate (26), and the height of the guide plate (29) gradually decreases toward the opening (28). The end of the guide plate (29) passes through the opening (28) and is detachably connected to the scraper (23).

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