A small-diameter steel pipe internal coating main unit and equipment

Abstract

This utility model relates to the field of steel pipe internal spraying technology, and in particular to a main machine and equipment for internal roller coating of small-diameter steel pipes, comprising: a frame for supporting various components for driving the steel pipe to perform internal roller coating operations; a feeding and lifting mechanism, installed on the frame and located on the feeding side of the main machine for supporting and lifting the steel pipe to be coated; a feeding and transferring mechanism, installed on the frame for supporting and transferring the steel pipe lifted by the feeding and lifting mechanism; a rotating support part, installed on the frame and including an active roller and an auxiliary rotating mechanism; and a pressing mechanism, installed on the frame for pressing down and limiting the steel pipe to be coated located on the rotating support part to prevent the steel pipe from rotating and detaching from the rotating support part. This invention addresses the technical problems commonly found in existing small-diameter internal roller coating equipment, such as uneven coating due to vibration caused by small pipe diameter, easy deformation of the steel pipe, and poor coating quality due to cement hardening caused by low roller coating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe internal spraying technology, and in particular to a main machine and equipment for internal spraying of small-diameter steel pipes. Background Technology

[0002] In municipal and water conservancy pipeline projects, in order to protect the inner wall of steel pipes from corrosion and ensure the quality of water transport, it is generally necessary to line the inner wall with a layer of cement mortar. For large-diameter steel pipes (such as pipe diameters exceeding DN500), the centrifugal rotation method is commonly used for construction. The specific operation involves placing the steel pipe horizontally on two sets of drive tires arranged in a V-shape, using tire friction to drive the steel pipe to rotate at a low speed, while simultaneously injecting cement slurry into the pipe. Under the combined action of gravity and centrifugal force, the slurry spreads out on the inner wall of the pipe and initially compacts. By controlling the rotation speed and time, the inner lining layer is finally formed.

[0003] The prior art discloses a steel pipe internal roller coating device, a utility model patent with publication number CN217473907U, which discloses a device including a guide rail that extends along the axial direction of the steel pipe, a transport trolley that is slidably connected to the guide rail, a material box and a powder loading box that are rotatably connected to the transport trolley, the powder loading box being disposed at one end of the guide rail, and the transport trolley sliding along the guide rail to enter the powder loading box, thus achieving a high degree of automation. The aforementioned technical solutions and related technologies still have many problems, such as: ① The structural rigidity of small-diameter steel pipes is much lower than that of large-diameter steel pipes. When supported by V-shaped tires, due to the large distance between the fulcrums, the middle of the pipe will undergo significant downward deformation due to its own weight. This deformation will lead to extremely poor dynamic balance of the steel pipe during rotation, resulting in violent jumping and vibration. This not only fails to guarantee the uniformity of the inner lining coating but also poses equipment damage and safety risks; ② The cement mortar roller coating process places extremely high speed requirements on small-diameter steel pipes, typically 300-400 rpm, to achieve a dense coating and meet specified requirements. Thickness; under high-speed rotation, the existing tire drive method will amplify the inherent non-roundness and deformation of the steel pipe, resulting in extremely unstable equipment operation; ③ The cement mortar used for the inner lining has the characteristic of rapid hardening, requiring the entire roller coating process to be completed in a very short time, such as within 3 minutes. In order to form a coating with uniform thickness and smooth surface in a short time, the process requires the equipment to have the capability of low speed first and then high speed, using stronger centrifugal force to compact the slurry, fix the thickness and remove excess water. However, the existing large pipe equipment drive system is simple, with a narrow speed range and slow response, which cannot meet the requirements of this complex process sequence. Utility Model Content

[0004] The purpose of this utility model is to provide a roller coating host and equipment for small-diameter steel pipes, which solves the technical problems commonly found in existing roller coating equipment for small-diameter pipes, such as uneven coating due to vibration caused by small pipe diameter, easy deformation of steel pipes, and poor coating quality due to cement hardening caused by low roller coating efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A small-diameter steel pipe internal coating host includes:

[0007] The frame is used to support the various components and drive the steel pipes to perform internal coating operations.

[0008] The loading and lifting mechanism is installed on the frame and located on the loading side of the main unit to support and lift the steel pipes to be coated.

[0009] The material feeding and transfer mechanism is installed on the frame to support and transfer the steel pipes lifted by the material feeding and lifting mechanism;

[0010] A rotating support unit is mounted on a frame and includes an active roller and an auxiliary rotating mechanism. The auxiliary rotating mechanism includes an auxiliary roller. The active roller and the auxiliary roller together support the steel pipe to be coated by the feeding and conveying mechanism. The rotation of the active roller causes the steel pipe to be coated to rotate.

[0011] The pressing mechanism, installed on the frame, is used to press down and limit the steel pipe to be coated on the rotating support to prevent the steel pipe from rotating and detaching from the rotating support.

[0012] The frame is also equipped with a material unloading and tilting mechanism, which is used to support, lift and transport the coated steel pipes away from the frame.

[0013] Furthermore, the auxiliary rotating mechanism is slidably mounted relative to the frame to adjust the distance between the auxiliary roller and the active roller.

[0014] Furthermore, the auxiliary rotation mechanism also includes an auxiliary drive unit that is fixedly installed relative to the frame. The power end of the auxiliary drive unit drives the auxiliary moving plate to move in a direction away from or close to the active roller through an auxiliary drive screw and an auxiliary screw nut mechanism. The auxiliary roller is rotatably mounted on the auxiliary moving plate, and the auxiliary moving plate is slidably installed relative to the frame.

[0015] Furthermore, the loading and lifting mechanism includes a loading and lifting power unit that is fixedly installed relative to the frame. The power end of the loading and lifting power unit is equipped with a loading and lifting plate. The upper surface of the loading and lifting plate is provided with a loading support platform. The upper surface of the loading support platform is inclined, and the inclination direction extends from the outside of the frame to the inside, becoming lower and lower.

[0016] Furthermore, the feeding and conveying mechanism includes an upper support plate that is fixedly installed relative to the frame. The upper support plate provides intermediate support for the steel pipe to be coated so that it can roll to the rotating support part. A movable plate is slidably installed on the upper surface of the upper support plate. The movable plate is used as an extension plate of the upper support plate to accommodate steel pipes of different sizes.

[0017] Furthermore, the lower surface of the upper support plate is provided with a guide cylinder that is fixed to it. A guide post is slidably installed inside the guide cylinder. The guide post is fixed to the moving plate. The side of the guide cylinder is provided with a tightening part that penetrates its side wall. The tightening part is rotated and tightened on the guide post to achieve relative fixation between the guide post and the guide cylinder.

[0018] Furthermore, the unloading and tilting mechanism includes an unloading lifting power unit that is fixedly installed relative to the frame. The power end of the unloading lifting power unit is fixedly installed relative to the unloading lifting plate. The unloading lifting power unit and the unloading support plate are installed on the unloading lifting plate. The unloading lifting power unit is rotatably installed on the unloading lifting plate. The power end of the unloading lifting power unit is rotatably installed on one end of the unloading support plate. The unloading support plate is rotatably installed relative to the unloading lifting plate.

[0019] Furthermore, the upper surface of the unloading pallet is designed with a U-shaped structure. The unloading pallet is installed to rotate synchronously with the rotating shaft. A bottom support is fixedly installed at the bottom of the unloading pallet. The bottom support is installed to rotate synchronously with the rotating shaft and its bottom is placed on the loading pallet. Both ends of the rotating shaft are rotatably installed on the unloading pallet through bearing seats.

[0020] Furthermore, the active roller is rotatably mounted on the platform of the frame, and the active roller is driven to rotate by an active drive unit that is fixedly mounted relative to the frame.

[0021] A small-diameter steel pipe internal coating equipment includes a main unit, a loading platform, and a unloading platform. The loading platform and the unloading platform are located on both sides of the main unit. The loading platform is used to roll the steel pipe to be coated to the loading side of the main unit, and the unloading platform is used to roll and store the coated steel pipe.

[0022] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0023] (1). This utility model realizes the feeding action of the steel pipe to be coated by setting up a feeding lifting mechanism and a feeding transfer mechanism. The rotating and limiting action of the steel pipe to be coated is realized by the pressing mechanism in conjunction with the rotating support part, which prevents the steel pipe from detaching from the rotating support part during high-speed rotation, which helps to ensure the uniformity of the inner coating and avoid the deformation of the steel pipe, thus indirectly improving the coating quality. The unloading and flipping mechanism realizes the unloading action of the coated steel pipe. The whole equipment realizes automated feeding, coating and unloading operations, which improves the coating efficiency. At the same time, the auxiliary rotating mechanism is set up to slide relative to the frame to be suitable for supporting steel pipes of different diameters, thus expanding the scope of application.

[0024] (2). By limiting the specific structure of the feeding and lifting power unit, this utility model realizes the lifting action of the steel pipe to be coated, making it flush with the feeding and conveying mechanism, thereby facilitating the movement of the steel pipe to be coated to the rotating support unit via the feeding and conveying mechanism. By limiting the specific structure of the feeding and conveying mechanism, it realizes the conveying of steel pipes of different diameters, further improving the scope of application. The unloading and turning mechanism realizes the lifting and unloading action of the steel pipe after the coating operation is completed, achieving the purpose of realizing complex actions from a simple structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the main structure of the host of this utility model;

[0026] Figure 2 This is a top view of the main unit of this utility model.

[0027] Figure 3 This is a schematic diagram of the left side structure of the main unit of this utility model;

[0028] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0029] Figure 5 This is a three-dimensional structural diagram of the host unit of this utility model;

[0030] Figure 6 This is a three-dimensional structural diagram of the feeding and tilting mechanism;

[0031] Figure 7 A three-dimensional structural diagram of the material feeding and conveying mechanism;

[0032] Figure 8 This is a schematic diagram of the left-side structure of the material feeding and conveying mechanism;

[0033] Figure 9 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0034] In the diagram: 100, Main unit; 101, Frame; 1011, Platform; 1012, Frame; 102, Auxiliary rotating mechanism; 1021, Auxiliary drive unit; 1022, Auxiliary drive screw; 1023, Auxiliary roller; 1024, Auxiliary screw nut mechanism; 1025, Auxiliary moving plate; 103, Active roller; 1031, Active drive unit; 104, Pressing mechanism; 1041, Support; 1042, Pressing power unit; 105, Material unloading and tilting mechanism; 1051, Material unloading power unit; 1052... 1053. Unloading pallet; 1054. Unloading lifting power unit; 1055. Unloading lifting plate; 1056. Rotating shaft; 1057. Bottom support; 106. Loading lifting mechanism; 1068. Loading lifting power unit; 1069. Loading lifting plate; 1060. Loading support platform; 1070. Loading transfer mechanism; 1071. Vertical plate; 1072. Upper pallet; 1073. Moving plate; 1074. Guide column; 1075. Guide cylinder; 1076. Tightening part; 200. Loading platform; 300. Unloading platform. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0037] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0038] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0039] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] To address the limitations of existing technologies, this embodiment provides a technical solution. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0042] This invention addresses the problem in the prior art where, when applying cement lining to small-diameter steel pipes, the cement hardens quickly, requiring high-speed roller application. However, high speed can easily cause the steel pipe to deform and detach from the rotating roller, resulting in equipment damage, reduced coating efficiency, uneven coating thickness, and compromised coating quality.

[0043] Example 1

[0044] See appendix Figure 1-5A small-diameter steel pipe internal coating main unit 100 includes: a frame 101, which includes a frame 1012 and a platform 1011 mounted on the frame 1012. The frame and platform 1011 can be welded or detachably connected. The frame 101 supports various components for driving the steel pipe to perform internal coating operations. These components include a loading and lifting mechanism 106, a loading and transferring mechanism 107, a rotating support, a pressing mechanism 104, and a unloading and tilting mechanism 105. Specifically, the loading and lifting mechanism 106 is mounted on the frame 101 and located on the loading side of the main unit 100, used to support and lift the steel pipe to be coated. The loading and unloading sides of the main unit 100 are located on both sides of the rotating support. The loading and transferring mechanism 107 is mounted on the frame 101 for supporting... The steel pipe is lifted by the loading and lifting mechanism 106 and then transferred. This transfer can be understood as the steel pipe rolling along it to the rotating support. The rotating support is mounted on the frame 101 and includes a drive roller 103 and an auxiliary rotating mechanism 102. The drive roller 103 is rotatably mounted on the platform 1011 of the frame 101. The drive roller 103 is driven to rotate by the drive unit 1031, which is fixedly mounted relative to the frame 101. Specifically, the drive roller 103 is divided into several segments, and adjacent segments of the drive roller 103 are synchronously rotated and mounted through couplings. The two ends of each segment of the drive roller 103 are rotatably mounted relative to the bearing seats fixed on the platform 1011 through bearings. The drive roller 103 is driven to rotate by the drive unit 1031 through belt drive. Here, the drive unit 1031 is preferably a motor. The auxiliary rotating mechanism 102 includes an auxiliary roller 1023. The active roller 103 and the auxiliary roller 1023 together support the steel pipe to be coated, which is conveyed by the feeding and conveying mechanism 107. The rotation of the active roller 103 causes the steel pipe to be coated to rotate. The steel pipe is located above and tangent to both the active roller 103 and the auxiliary roller 1023. The pressing mechanism 104, mounted on the frame 101, is used to press down and limit the steel pipe to be coated located on the rotating support to prevent the steel pipe from rotating and detaching from the rotating support. It can be understood here that the pressing mechanism 104 includes a support. The frame 1041 and the pressing power unit 1042 are installed. The frame 1041 is mounted on the frame 1012 of the frame body 101. The pressing power unit 1042 is a cylinder and is mounted on the frame 1041. The power end of the pressing power unit 1042 is rotatably mounted with a roller. After being pressed down, the roller presses against the outer wall of the steel pipe and rolls relative to the steel pipe. The frame body 101 is also equipped with a feeding and turning mechanism 105. The feeding and turning mechanism 105 is used to support and lift the coated steel pipe and transport it away from the frame body 101.

[0045] See appendix Figure 2-5The auxiliary rotating mechanism 102 is slidably mounted relative to the frame 101 to adjust the distance between the auxiliary roller 1023 and the active roller 103. Specifically, the auxiliary rotation mechanism 102 also includes an auxiliary drive unit 1021 that is fixedly installed relative to the platform 1011 of the frame 101. The auxiliary power unit is preferably a cylinder. The power end of the auxiliary drive unit 1021 drives the auxiliary moving plate 1025 to move in a direction away from or near the active roller 103 through the auxiliary drive screw 1022 and the auxiliary screw nut mechanism 1024. The auxiliary roller 1023 is rotatably mounted on the auxiliary moving plate 1025. The auxiliary moving plate 1025 is slidably mounted relative to the frame 101. It can be understood here that the auxiliary drive screw 1022 is synchronously rotated with the power end of the auxiliary power unit. The auxiliary drive screw 1022 is rotatably mounted relative to the platform 1011. The auxiliary drive screw 1022 is threadedly rotated with the auxiliary screw nut mechanism 1024. The auxiliary screw nut mechanism 1024 is fixedly mounted relative to the auxiliary moving plate 1025. The auxiliary moving plate 1025 is slidably mounted on the platform 1011 through a slide rail and a slider assembly.

[0046] See appendix Figure 3-5 The loading lifting mechanism 106 includes a loading lifting power unit 1061 that is fixedly installed relative to the frame 101. The loading lifting power unit 1061 is preferably a cylinder and there can be multiple cylinders. The power end of the loading lifting power unit 1061 is equipped with a loading lifting plate 1062. The loading lifting plate 1062 is fixedly installed relative to the power ends of multiple lifting power units. The upper surface of the loading lifting plate 1062 is provided with a loading support platform 1063. The upper surface of the loading support platform 1063 is inclined, and the inclination direction extends from the outside of the frame 101 to the inside and gradually decreases. The purpose of this setting is to facilitate the steel pipe to roll to the loading transfer mechanism 107 under its own weight.

[0047] See appendix Figure 7-8The feeding and conveying mechanism 107 includes an upper support plate 1072 that is fixedly installed relative to the frame 101. The upper support plate 1072 provides intermediate support for the steel pipe to be coated so that it can roll to the rotating support part. As can be seen from the figure, the upper support plate 1072 is fixedly installed relative to the base plate through two upright plates 1071. The base plate is provided with a long mounting hole for fixing the base plate relative to the platform 1011. A movable plate 1073 is slidably installed on the upper surface of the upper support plate 1072. The movable plate 1073 is used as an extension plate of the upper support plate 1072 to accommodate steel pipes of different sizes. Specifically, the lower surface of the upper support plate 1072 is provided with a guide cylinder 1075 fixed thereto. A guide post 1074 is slidably installed inside the guide cylinder 1075. The guide post 1074 is fixedly disposed relative to the moving plate 1073. A clamping part 1076 penetrating through the side wall of the guide cylinder 1075 is provided on its side. The clamping part 1076 rotates and clamps against the guide post 1074 to achieve relative fixation between the guide post 1074 and the guide cylinder 1075. It is understood here, and as can be seen from the figure, that there are two guide cylinders 1075 and two guide posts 1074.

[0048] See appendix Figure 2-6 The unloading and tilting mechanism 105 includes more than one unloading lifting power unit 1053 that is fixedly installed relative to the platform 1011 of the frame 101. The unloading lifting power unit 1053 is preferably a cylinder. The power end of the unloading lifting power unit 1053 is fixedly installed relative to the unloading lifting plate 1054. The unloading power unit 1051 and the unloading support plate 1052 are installed on the unloading lifting plate 1054. Specifically, the unloading power unit 1051 is rotatably installed on the unloading lifting plate 1054, and the power end of the unloading power unit 1051 is rotatably installed at one end of the unloading support plate 1052. The unloading support plate 1052 is rotatably installed relative to the unloading lifting plate 1054. Specifically, the upper surface of the unloading pallet 1052 is designed with a U-shaped structure. The unloading pallet 1052 is installed and rotates synchronously with the rotating shaft 1055. The bottom support 1056 is fixedly installed at the bottom of the unloading pallet 1052. The bottom support 1056 is installed and rotates synchronously with the rotating shaft 1055 and its bottom is placed on the loading pallet. The two ends of the rotating shaft 1055 are rotatably installed on the unloading pallet 1052 through bearing seats. It can be understood that the bottom support 1056 is designed with a U-shape. This U-shaped structure is welded together with the unloading base plate and the rotating shaft 1055.

[0049] Example 2

[0050] See appendix Figure 9A small-diameter steel pipe internal coating equipment includes a main unit 100, a loading platform 200 and a unloading platform 300. The loading platform 200 and the unloading platform 300 are located on both sides of the main unit 100. The loading platform 200 is used to allow the steel pipe to be coated to roll along it to the loading side of the main unit 100. The unloading platform 300 is used to allow the coated steel pipe to roll along it for storage. A baffle is provided on the side of the unloading platform 300 away from the main unit 100 to temporarily block and store the coated steel pipe.

[0051] When using the roller coating equipment of this invention to coat cement onto the inner wall of a small-diameter steel pipe, the steel pipe is conveyed from the previous production line to the loading platform 200. The steel pipe rolls from the loading platform 200 to above the loading lifting mechanism 106. The loading lifting mechanism 106 lifts the steel pipe so that the loading lifting plate 1062 is flush with the upper support plate 1072 of the loading transfer mechanism 107. The steel pipe rolls to the upper support plate 1072, and then rolls via the upper support plate 1072 to the area between the drive roller 103 and the auxiliary roller 1023. The position of the auxiliary roller 1023 needs to be adjusted in advance according to the diameter of the steel pipe. Then, the pressing mechanism 104 actuates the roller at its power end. The rollers press the steel pipe together and feed cement into it. The active drive unit 1031 is activated, driving the active roller 103 to rotate. The rotation of the active roller 103 drives the steel pipe to rotate. At the same time, the auxiliary roller 1023 and the rollers of the pressing mechanism 104 rotate to coat the cement. After the coating is completed, the unloading power unit 1051 of the unloading and turning mechanism 105 is activated to lift the unloading lifting plate 1054. The unloading pallet 1052 lifts the steel pipe and separates it from the active roller 103 and the auxiliary roller 1023. Then the unloading power unit 1051 is activated to rotate the unloading pallet 1052, so that the steel pipe separates from the unloading pallet 1052 and enters the unloading platform 300.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A small-diameter steel pipe internal roller coating main unit, characterized in that, include: The frame (101) is used to support the various components for driving the steel pipe to perform internal coating operations; The loading and lifting mechanism (106) is installed on the frame (101) and located on the loading side of the main unit (100) for supporting and lifting the steel pipe to be coated. The loading and transfer mechanism (107) is installed on the frame (101) to support and transfer the steel pipes lifted by the loading and lifting mechanism (106); A rotating support unit, mounted on a frame (101), includes an active roller (103) and an auxiliary rotating mechanism (102). The auxiliary rotating mechanism (102) includes an auxiliary roller (1023). The active roller (103) and the auxiliary roller (1023) together support the steel pipe to be coated, which is conveyed by the feeding and conveying mechanism (107). The rotation of the active roller (103) causes the steel pipe to be coated to rotate. A pressing mechanism (104), mounted on the frame (101), is used to press down and limit the steel pipe to be coated located on the rotating support unit to prevent the steel pipe from rotating and detaching from the rotating support unit. The frame (101) is also equipped with a material unloading and tilting mechanism (105), which is used to support and lift the coated steel pipe and transport it away from the frame (101).

2. The small-diameter steel pipe internal coating host according to claim 1, characterized in that, The auxiliary rotating mechanism (102) is slidably mounted relative to the frame (101) to adjust the distance between the auxiliary roller (1023) and the active roller (103).

3. The small-diameter steel pipe internal coating host according to claim 2, characterized in that, The auxiliary rotating mechanism (102) further includes an auxiliary drive unit (1021) that is fixedly installed relative to the frame (101). The power end of the auxiliary drive unit (1021) drives the auxiliary moving plate (1073) (1025) to move in a direction away from or close to the active roller (103) through the auxiliary drive screw (1022) and the auxiliary screw nut mechanism (1024). The auxiliary roller (1023) is rotatably installed on the auxiliary moving plate (1073) (1025). The auxiliary moving plate (1073) (1025) is slidably installed relative to the frame (101).

4. The small-diameter steel pipe internal coating host according to claim 1, characterized in that, The loading lifting mechanism (106) includes a loading lifting power unit (1061) fixedly installed relative to the frame (101). The power end of the loading lifting power unit (1061) is equipped with a loading lifting plate (1062). The upper surface of the loading lifting plate (1062) is provided with a loading support platform (1063). The upper surface of the loading support platform (1063) is inclined, and the inclination direction extends from the outside of the frame (101) to the inside and becomes lower and lower.

5. The small-diameter steel pipe internal coating host according to claim 1, characterized in that, The feeding and conveying mechanism (107) includes an upper support plate (1072) fixedly installed relative to the frame (101). The upper support plate (1072) provides intermediate support for the steel pipe to be coated so that it can roll to the rotating support part. A movable plate (1073) is slidably installed on the upper surface of the upper support plate (1072). The movable plate (1073) is used as an extension plate of the upper support plate (1072) to accommodate steel pipes of different sizes.

6. The small-diameter steel pipe internal coating host according to claim 5, characterized in that, The lower surface of the upper support plate (1072) is provided with a guide cylinder (1075) fixed relative to it. A guide post (1074) is slidably installed inside the guide cylinder (1075). The guide post (1074) is fixed relative to the moving plate (1073). The side of the guide cylinder (1075) is provided with a tightening part (1076) that penetrates its side wall. The tightening part (1076) is rotated and tightened on the guide post (1074) to realize the relative fixation of the guide post (1074) and the guide cylinder (1075).

7. The small-diameter steel pipe internal coating host according to claim 1, characterized in that, The unloading and tilting mechanism (105) includes an unloading lifting power unit (1053) that is fixedly installed relative to the frame (101). The power end of the unloading lifting power unit (1053) is fixedly installed relative to the unloading lifting plate (1054). The unloading power unit (1051) and the unloading support plate (1052) are installed on the unloading lifting plate (1054). The unloading power unit (1051) is rotatably installed on the unloading lifting plate (1054). The power end of the unloading power unit (1051) is rotatably installed at one end of the unloading support plate (1052). The unloading support plate (1052) is rotatably installed relative to the unloading lifting plate (1054).

8. The small-diameter steel pipe internal coating host according to claim 7, characterized in that, The upper surface of the feeding tray (1052) is designed with a U-shaped structure. The feeding tray (1052) is installed and rotates synchronously with the rotating shaft (1055). A bottom support (1056) is fixedly installed at the bottom of the feeding tray (1052). The bottom support (1056) is installed and rotates synchronously with the rotating shaft (1055) and its bottom is placed on the feeding tray. Both ends of the rotating shaft (1055) are rotatably installed on the feeding tray (1052) through bearing seats.

9. The small-diameter steel pipe internal coating host according to claim 1, characterized in that, The active roller (103) is rotatably mounted on the platform (1011) of the frame (101), and the active roller (103) is driven to rotate by an active drive unit (1031) that is fixedly mounted relative to the frame (101).

10. A small-diameter steel pipe internal coating equipment, comprising a small-diameter steel pipe internal coating main unit as described in any one of claims 1-9, characterized in that, It also includes a loading platform (200) and a unloading platform (300), which are located on both sides of the main unit (100). The loading platform (200) is used to allow the steel pipe to be coated to roll along it to the loading side of the main unit (100), and the unloading platform (300) is used to allow the coated steel pipe to roll along it for storage.

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