Spraying device for polyethylene outer anti-corrosion coating

Abstract

The utility model discloses a polyethylene outer anti-corrosion coating spraying device, and belongs to the technical field of steel pipeline spraying. The device comprises a base, a mounting rack, a mounting frame, an annular rail, two limiting mechanisms and two driving mechanisms. A mounting frame of a symmetrical frame structure is fixed to the upper end of a base, two supporting seats are symmetrically arranged in the mounting frame along the center, a plurality of supporting plates are connected between the supporting seats, an annular rail is fixed to the outer surfaces of the supporting plates in the length direction of a pipeline, and the lower end of a sliding seat in the rail is connected with a spray gun through a universal joint. A mounting frame with an air filter screen is arranged on the outer surface of the mounting frame, movable seats are arranged on two sides of the mounting frame and connected with a support frame, and a fixing frame and a fixing seat are connected onto the support frame. The limiting mechanism comprises a lead screw, a nut, a clamping block and a limiting assembly, and the driving mechanism drives the lead screw to drive the clamping block to be expanded and fixed from the interior of the pipeline. The device can stably clamp pipelines with different diameters, realizes automatic and uniform spraying, improves the coating quality and the production efficiency, and is suitable for external anti-corrosion treatment of steel pipelines.

Description

Technical Field

[0001] This utility model belongs to the field of steel pipeline spraying technology, specifically relating to a polyethylene external anti-corrosion coating spraying device. Background Technology

[0002] In the external corrosion protection of steel pipelines, polyethylene coatings are widely used due to their excellent corrosion resistance, mechanical strength, and durability. Traditional polyethylene coating spraying methods often involve manual hand-held spray gun operation or a simple method of using a fixed spray gun with a rotating pipe. Manual spraying suffers from problems such as uneven coating thickness, poor quality stability, low production efficiency, and high labor intensity. While simple automated spraying devices can reduce manpower, their functions are often limited. For example, they have poor adaptability when clamping pipes of different diameters, and unstable pipe fixation can lead to spraying vibrations. Most devices' spray guns can only perform fixed circular motions and cannot automatically adjust the spraying path according to the pipe length, easily resulting in coating accumulation at the pipe ends or missed areas in the middle. Furthermore, dust and other impurities in the spraying environment can easily adhere to the uncured coating surface, affecting the quality of the final product.

[0003] Therefore, existing technologies suffer from technical problems such as insecure pipe fixing, difficulty in ensuring uniform spraying, low degree of automation, and insufficient adaptability. There is an urgent need for a dedicated device that can stably clamp, accurately spray, and has a high degree of automation integration to solve these defects. Utility Model Content

[0004] The purpose of this utility model is to provide a polyethylene external anti-corrosion coating spraying device, which aims to solve the problems of insecure pipe fixing, difficulty in ensuring uniform spraying, low degree of automation, and insufficient adaptability in the existing technology.

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

[0006] A polyethylene external anti-corrosion coating spraying device, comprising:

[0007] The base has a mounting bracket fixed to its upper end. The bracket has a symmetrical frame structure. Two support seats are symmetrically arranged along the center position inside the mounting bracket. Multiple support plates are fixedly connected between the two support seats. Laser sensors for monitoring the position of the sliding seat are also provided at the close ends of the two support seats.

[0008] The mounting frame is located on the outer surface of the mounting bracket and is detachably connected to the mounting bracket by a snap-fit ​​mechanism. An air filter is provided on the inner surface of the mounting frame.

[0009] A circular track is fixedly connected to the outer surface of the plurality of support plates along the length direction of the pipeline, a sliding seat is arranged in the circular track, and a spray gun is connected to the lower end of the sliding seat through a universal joint.

[0010] Two sets of limiting mechanisms are arranged in the mounting frame to extend into the pipeline and expand and fix the pipeline from the inside, and the limiting mechanism and the mounting frame form a stable pipeline support structure, so that the pipeline is suspended and positioned at the center of the circular track.

[0011] As a preferred scheme of the utility model, both sides of the mounting frame are provided with movable seats, one end of each of the two movable seats is fixedly connected with a handle, the other end of each of the two movable seats is fixedly connected with a support frame, and the proximal end of each of the two support frames is fixedly connected with a fixed frame and a plurality of fixed seats.

[0012] As a preferred scheme of the utility model, each set of limiting mechanisms comprises:

[0013] A plurality of lead screws are rotatably connected to one end of the plurality of fixed seats, and the other end of each of the plurality of lead screws is movably penetrated through the fixed frame and fixedly connected with a second bevel gear.

[0014] A plurality of nuts are respectively threadedly connected to the circumferential surface of the plurality of lead screws, and the plurality of nuts are fixedly connected with a clamping block through a connecting block.

[0015] A limiting assembly is arranged between the fixed frame and the fixed seat, and is used for limiting the rotation of the nut, so that the nut can only move in the axial direction when the lead screw rotates, thereby driving the clamping block to move radially to expand or loosen the inner wall of the pipeline.

[0016] As a preferred scheme of the utility model, each set of limiting assemblies comprises:

[0017] A plurality of limiting rods are fixedly connected to the fixed frame and arranged in parallel with the lead screw.

[0018] A plurality of limiting blocks are respectively slidably sleeved on the plurality of limiting rods, and one end of each of the plurality of limiting blocks is fixedly connected with the nut.

[0019] As a preferred scheme of the utility model, two sets of driving mechanisms are further included, and each set of driving mechanisms comprises:

[0020] A motor is fixedly installed on the movable seat, and a heat dissipation shell is fixedly connected to the outer surface of the motor.

[0021] A rotating shaft is fixedly connected to the output end of the motor at one end, and movably penetrates through the fixed frame at the other end.

[0022] The first bevel gear is fixedly connected to the end of the rotating shaft and meshes with all the second bevel gears to synchronously drive all the lead screws to rotate.

[0023] As a preferred embodiment of this utility model, two telescopic grooves are provided on both sides of the base, and telescopic blocks that slide in cooperation with the telescopic grooves are fixedly connected to the bottom of the two movable seats.

[0024] As a preferred embodiment of this utility model, multiple insertion holes are provided on both sides of the two mounting brackets, and multiple insertion blocks are fixedly connected to the opposing ends of the two movable seats. When the movable seats move towards each other and close, the insertion blocks are inserted into the corresponding insertion holes to achieve positioning and locking.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] In this design, a circular track is set along the length of the pipeline, and the sliding seat drives the spray gun to move in a circular motion along the track. With the help of a laser sensor to monitor the position of the sliding seat in real time, the spraying path can be automatically adjusted according to the length of the pipeline to achieve spiral full-coverage spraying, thereby reducing the coating thickness deviation.

[0027] Two sets of symmetrical limiting mechanisms are used to drive the bevel gear synchronous transmission screw through the motor, which drives the nut and clamping block to move radially. It can be inserted into the pipe to achieve expansion and fixation, and is suitable for steel pipes of different diameters. During the clamping process, the limiting rod and the limiting block restrict the rotation of the nut to ensure the stable movement of the clamping block and effectively avoid uneven coating caused by pipe movement or vibration during spraying. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a perspective view of the present utility model;

[0030] Figure 2 This is a first perspective sectional view of the present invention;

[0031] Figure 3 This utility model Figure 2 Enlarged view of section A in the image;

[0032] Figure 4 This is a second perspective sectional view of the present invention;

[0033] Figure 5 This utility model Figure 4 Enlarged view of section B in the image;

[0034] Figure 6 It is the first exploded view of the utility model;

[0035] Figure 7 It is the second exploded view of the utility model.

[0036] In the figure: 1, base; 2, mounting frame; 3, mounting frame; 4, air filter screen; 5, movable seat; 6, handle; 7, heat dissipation shell; 8, motor; 9, plug hole; 10, plug block; 11, rotating shaft; 12, support frame; 13, annular track; 14, support seat; 15, support plate; 16, laser sensor; 17, sliding seat; 18, spray gun; 19, telescopic block; 20, telescopic groove; 21, fixing frame; 22, fixed seat; 23, screw rod; 24, nut; 25, limiting rod; 26, limiting block; 27, connecting block; 28, clamping block; 29, first bevel gear; 30, second bevel gear. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0038] Embodiment 1: please refer to Figures 1-7 The utility model provides the following technical scheme:

[0039] A polyethylene outer anticorrosive coating spraying device, comprising:

[0040] The base 1, the mounting frame 2 is fixed on the upper end, it is symmetrical frame structure, two support seats 14 are symmetrically arranged along the center position in the mounting frame 2, a plurality of support plates 15 are fixedly connected between the two support seats 14, and the laser sensor 16 for monitoring the position of the sliding seat 17 is also arranged on the end of the two support seats 14 close to each other;

[0041] The mounting frame 3 is arranged on the outer surface of the mounting frame 2 and is detachably connected with the mounting frame 2 by buckle type, and the inner surface of the mounting frame 3 is provided with the air filter screen 4;

[0042] The annular track 13 is fixedly connected to the outer surfaces of the plurality of support plates 15 along the length direction of the pipeline, the sliding seat 17 is arranged in the annular track 13, and the spray gun 18 is connected to the lower end of the sliding seat 17 through the universal joint;

[0043] Two sets of limiting mechanisms, both of which are arranged in the mounting frame 2 to extend into the pipeline and expand and fix the pipeline from the inside, and the limiting mechanism and the mounting frame 2 form a stable pipeline support structure, so that the pipeline is suspended and positioned at the center of the annular track 13.

[0044] In the embodiment of the utility model, the base 1 is set as the basic support structure of the whole device, provides the installation base for all other components, ensures the stability and overall rigidity of the device, the mounting frame 2 is fixed on the upper end of the base 1, is used to bear and fix the subsequent components such as support seat 14, support plate 15, support seat 14 is as the direct installation base of support plate 15, the weight and stress of support plate 15 and the annular track 13 it bears are transferred to the mounting frame 2, according to support plate 15 provides the specific installation connecting point for annular track 13, and keeps annular track 13 in the state of suspension, leaves the operation space for pipeline, the mounting frame 3 is set on the outer surface of the mounting frame 2, and the role is to form an installation cavity, is used to accommodate and fix the air filter screen 4, the air filter screen 4 filters the air entering the device working area, reduces the impurity pollution such as dust to the surface of the coating that has not dried, guarantees the spraying quality, the two laser sensors 16 set are used to detect the running position of the sliding seat 17 on the annular track 13, when the sliding seat 17 runs to the detection area of the laser sensor 16, the laser sensor 16 will send a signal, the signal can be used to control the start-stop or reverse motion of the sliding seat 17, realizes the automatic reciprocating spraying, the annular track 13 provides a closed annular motion path for the sliding seat 17, guides the circular motion of the spray gun 18 around the pipeline to be sprayed, the sliding seat 17 slides along the annular track 13, thereby driving the spray gun 18 at the lower end thereof to move, the spray gun 18 is set at the lower end of the sliding seat 17, receives the supply of spraying material, and uniformly sprays the anti-corrosion coating material such as polyethylene on the outer surface of the pipeline located at the center of the annular track 13, the screw rod 23 is set to rotate under the action of driving force, the linear motion of the nut 24 is converted from the rotary motion according to the screw thread on the circumferential surface thereof, the nut 24 is screw-connected on the circumferential surface of the screw rod 23, by moving along the axial direction of the screw rod 23 when the screw rod 23 rotates, and then pushing or pulling back the clamping block 28 through the connecting block 27, the connecting block 27 is connected between the nut 24 and the clamping block 28, and the linear motion of the nut 24 is transmitted to the clamping block 28, the clamping block 28 directly contacts the inner wall of the pipeline, and the internal part of the pipeline is expanded or loosened through the radial movement thereof, the limiting rod 25 is fixed between the fixed seat 22 and the fixing frame 21 and is arranged in parallel with the screw rod 23, as the sliding guide rail of the limiting block 26, and the limiting block 26 moves together with the nut 24, but can only perform linear motion due to being constrained by the limiting rod 25, thereby preventing the rotation of the nut 24, improving the spraying uniformity of the surface of the steel pipeline, and ensuring the quality stability, effectively ensuring the uniformity and consistency of the coating thickness, significantly improving the product quality, improving the fixing stability of the pipeline, and firmly clamping the pipelines with different diameters, effectively preventing the movement or vibration of the pipeline during the spraying process, providing a stable working basis for high-quality spraying, realizing high automation and convenient operation, reducing the labor intensity of the operators, improving the production efficiency, and reducing the influence of human factors on the quality.It needs to be explained that: the specific use of which type of ring track 13, laser sensor 16, sliding seat 17 and spray gun 18 is selected by the relevant technical personnel familiar with the field, and the above about ring track 13, laser sensor 16, sliding seat 17 and spray gun 18 etc. Belong to the prior art, this scheme is not described.

[0045] It needs to be explained that the positioning of the laser sensor 16 of the present scheme can also be positioned by using a magnetic scale system. Specifically, a magnetic scale ruler is laid along the ring track 13, and a magnetic scale ruler reading head is installed on the sliding seat 17. The reading head moves synchronously with the sliding seat 17, reads the position signal on the magnetic scale ruler in real time and transmits it to the control system, accurately obtains the circumferential position of the sliding seat 17, ensures the stability of the spraying track of the spray gun 18, and adapts to different precision requirements of the spraying scene.

[0046] For details, please refer to Figure 2 and Figure 5 , the two sides of the mounting frame 2 are provided with movable seats 5, one end of each of the two movable seats 5 is fixedly connected with a handle 6, the other end of each of the two movable seats 5 is fixedly connected with a support frame 12, and the proximal end of each of the two support frames 12 is fixedly connected with a fixed frame 21 and a plurality of fixed seats 22.

[0047] In this embodiment: the operator pulls the movable seat 5 to the two sides through the handle 6, so that the movable seat 5 drives the support frame 12, the fixed frame 21 and the limiting mechanism to move outward synchronously, expands the distance between the two groups of clamping blocks 28, and facilitates the to-be-sprayed pipeline to pass through the center of the ring track 13 and be placed between the two groups of clamping blocks 28.

[0048] For details, please refer to Figure 5 Each limiting mechanism comprises:

[0049] A plurality of lead screws 23, one end of each of the plurality of lead screws 23 is rotatably connected to one end of the plurality of fixed seats 22, and the other end is movably penetrated through the fixed frame 21 and fixedly connected with a second bevel gear 30;

[0050] A plurality of nuts 24, each of the plurality of nuts 24 is threadedly connected to the circumferential surface of the plurality of lead screws 23, and each of the plurality of nuts 24 is fixedly connected with a clamping block 28 through a connecting block 27;

[0051] A limiting assembly is arranged between the fixed frame 21 and the fixed seat 22, which is used to limit the rotation of the nut 24, so that it can only move along the axial direction when the lead screw 23 rotates, thereby driving the radial movement of the clamping block 28 to tighten or loosen the inner wall of the pipeline.

[0052] In this embodiment: the screw rod 23 is rotated under the action of driving force, and the rotation motion is converted into the linear motion of the nut 24 according to the thread on the circumferential surface of the screw rod 23. The nut 24 is threadedly connected to the circumferential surface of the screw rod 23, and moves along the axial direction of the screw rod 23 when the screw rod 23 rotates, and then pushes or pulls back the clamping block 28 through the connecting block 27. The connecting block 27 connects the nut 24 and the clamping block 28, and transmits the linear motion of the nut 24 to the clamping block 28. The clamping block 28 directly contacts the inner wall of the pipe, and expands or loosens the inside of the pipe through the radial movement. The limiting rod 25 is fixed between the fixed seat 22 and the fixed frame 21 and is arranged in parallel with the screw rod 23, and serves as the sliding guide rail of the limiting block 26. At the same time, the limiting block 26 moves together with the nut 24, but can only move linearly due to the constraint of the limiting rod 25, thereby preventing the rotation of the nut 24.

[0053] For details, please refer to Figure 5 Each limiting assembly includes:

[0054] A plurality of limiting rods 25 are fixedly connected to the fixed frame 21 and arranged in parallel with the screw rod 23.

[0055] A plurality of limiting blocks 26 are respectively slidably sleeved on the plurality of limiting rods 25, and one end of each limiting block 26 is fixedly connected to the nut 24.

[0056] In this embodiment: the limiting rod 25 is fixed between the fixed seat 22 and the fixed frame 21 and is arranged in parallel with the screw rod 23, and serves as the sliding guide rail of the limiting block 26. At the same time, the limiting block 26 moves together with the nut 24, but can only move linearly due to the constraint of the limiting rod 25, thereby preventing the rotation of the nut 24.

[0057] For details, please refer to Figure 5 and Figure 6 Further comprising two groups of driving mechanisms, each driving mechanism comprising:

[0058] A motor 8 is fixedly installed on the movable seat 5, and a heat dissipation shell 7 is fixedly connected to the outer surface of the motor 8.

[0059] A rotating shaft 11 is fixedly connected at one end to the output end of the motor 8 and movably penetrates the fixed frame 21 at the other end.

[0060] A first bevel gear 29 is fixedly connected to the distal end of the rotating shaft 11 and is engaged with all the second bevel gears 30, for synchronously driving all the screw rods 23 to rotate.

[0061] In this embodiment: the motor 8 is provided with rotating power, as the power source of the whole clamping pipeline, the heat dissipation shell 7 is fixed to the outer surface of the motor 8, which increases the heat dissipation area of the motor 8, assists the motor 8 to dissipate heat, and prevents overheating damage. The rotating shaft 11 is fixedly connected to the output end of the motor 8. The power angle transmitted by the rotating shaft 11 is changed through the first bevel gear 29, and a plurality of second bevel gears 30 are driven to rotate synchronously, so as to drive the screw rod 23 to rotate. It should be noted that the specific model of the motor 8 is selected by the person skilled in the art, and the above motor 8 and the like belong to the prior art, which will not be described here.

[0062] For details, see Figure 6 and Figure 7 Both sides of the base 1 are provided with two expansion slots 20, and the bottom of the two movable seats 5 is fixedly connected with expansion blocks 19 which are in sliding cooperation with the expansion slots 20.

[0063] In this embodiment: the expansion slots 20 provide sliding space and track for the expansion blocks 19, guide the movement direction of the movable seat 5, and cooperate with the expansion slots 20 to guide the accurate movement of the movable seat 5 and enhance the support stability of the movable seat 5 in the stretched state.

[0064] For details, see Figure 6 and Figure 7 The two mounting frames 2 are provided with a plurality of insertion holes 9 at both sides, and the opposite ends of the two movable seats 5 are fixedly connected with a plurality of insertion blocks 10. When the movable seats 5 move towards each other and fold, the insertion blocks 10 are inserted into the corresponding insertion holes 9 to realize positioning and locking.

[0065] In this embodiment: the insertion holes 9 provide insertion positions for the insertion blocks 10 when the movable seats 5 are folded towards the mounting frames 2, and the insertion blocks 10 realize accurate positioning and rigid connection between the movable seats 5 and the main mounting frame 2, thereby improving the structural stability of the whole device in the working state.

[0066] The working principle and use process of the utility model are as follows: the operator holds the handle 6 of the movable seat 5 on the two sides of the mounting frame 2 away from each other with both hands, slowly pulls the movable seat 5 to the two sides, the telescopic block 19 at the bottom of the movable seat 5 slides outwards along the telescopic groove 20 on the two sides of the base 1, drives the support frame 12 and the fixing frame 21 at the other end of the movable seat 5 and the limiting mechanism to move outwards synchronously until the distance between the two sets of clamping blocks 28 is greater than the length of the pipeline to be sprayed, a space is reserved for the pipeline, after the pipeline to be sprayed is inserted through the center of the annular track 13, the limiting mechanism is preliminarily inserted into the pipeline to be sprayed, the movable seat 5 is folded to make the plug-in block 10 on it inserted into the plug-in hole 9 of the mounting frame 2 for positioning, at this time, the movable seat 5 and the mounting frame 2 form a rigid connection, the pipeline axis is completely coincident with the center of the annular track 13, the preliminary positioning of the pipeline is completed, then the motor 8 is started, the power is transmitted to the first bevel gear 29 through the rotating shaft 11 and drives the plurality of second bevel gears 30 to rotate synchronously, thereby driving the plurality of lead screws 23 to rotate, at the same time, the plurality of lead screws 23 drive the plurality of nuts 24 to move axially, the plurality of nuts 24 prevent themselves from rotating through the cooperation of the limiting block 26 and the limiting rod 25, thereby driving the clamping block 28 at the end of the connecting block 27 to move radially outwards, the pipeline is expanded and fixed from the inside, the spray gun 18 is started to supply material, and the sliding seat 17 carrying the spray gun 18 is driven to make a circular motion along the annular track 13, the laser sensor 16 on the support seat 14 monitors the position of the sliding seat 17 in real time, when the sliding seat 17 moves to the set position, the laser sensor 16 sends a signal, the control system can instruct the sliding seat 17 to reverse or control the pipeline to rotate, finally a uniform spiral coating is formed on the outer surface of the pipeline, after the spraying is completed, the motor 8 is reversed to drive the clamping block 28 to loosen the pipeline. The operator pulls open the movable seat 5, and the sprayed pipeline can be taken out.

[0067] Finally, it should be noted that: the above only for preferred embodiments of the utility model, and not for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A polyethylene outer anticorrosive coating spraying device characterized by comprising: The utility model relates to a kind of pipe expansion device, including: Base (1), the upper end of the base (1) is fixed with mounting frame (2), it is symmetrical frame structure, two support seats (14) are symmetrically arranged in the mounting frame (2) along the center position, a plurality of support plates (15) are fixedly connected between the two support seats (14), the end of the two support seats (14) is close to still be provided with laser sensor (16) for monitoring the position of sliding seat (17); Mounting frame (3) is arranged on the outer surface of mounting frame (2), and is detachably connected with mounting frame (2) using buckle type, the inner surface of mounting frame (3) is provided with air filter screen (4); Annular track (13), the outer surface of a plurality of support plates (15) is fixedly connected along the length direction of pipeline, sliding seat (17) is arranged in annular track (13), the lower end of sliding seat (17) is connected with spray gun (18) by universal joint; Two sets of limiting mechanisms, two sets of the limiting mechanisms are arranged in mounting frame (2) to realize the expansion and fixation of pipeline from inside, the limiting mechanism and mounting frame (2) form stable pipeline support structure, so that pipeline is suspended and positioned in the center of annular track (13).

2. A polyethylene outer anticorrosive coating spraying device according to claim 1, characterized in that: The two side ends of the mounting frame (2) are provided with movable seat (5), the end of the two movable seats (5) is fixedly connected with handle (6) away from each other, the other end of the two movable seats (5) is fixedly connected with support frame (12), the end of the two support frames (12) is close to fixedly connected with fixed frame (21) and a plurality of fixed seats (22).

3. A polyethylene outer anticorrosive coating spraying device according to claim 2, characterized in that: Each set of the limiting mechanism includes: A plurality of lead screws (23), one end of a plurality of the lead screws (23) is rotatably connected to one end of a plurality of fixed seats (22), the other end is movably penetrated through fixed frame (21) and fixedly connected with second bevel gear (30); A plurality of nuts (24), a plurality of the nuts (24) are respectively threadedly connected to the circumferential surface of a plurality of lead screws (23), a plurality of the nuts (24) are fixedly connected with clamping block (28) through connecting block (27); Limiting assembly, the limiting assembly is arranged between fixed frame (21) and fixed seat (22), for limiting the rotation of nut (24), so that it can only move along the axial direction when lead screw (23) rotates, thereby driving clamping block (28) to move radially to expand or loosen the inner wall of pipeline.

4. A polyethylene outer anticorrosive coating spraying device according to claim 3, characterized in that: Each set of the limiting assembly includes: A plurality of limiting rods (25), a plurality of the limiting rods (25) are fixedly connected to fixed frame (21), and are arranged in parallel with lead screw (23); A plurality of limiting blocks (26), a plurality of the limiting blocks (26) are respectively slidably sleeved on a plurality of limiting rods (25), and one end thereof is fixedly connected with nut (24).

5. A polyethylene outer anticorrosive coating spraying device according to claim 4, characterized in that: It further includes two sets of driving mechanisms, each set of the driving mechanism includes: Motor (8), the motor (8) is fixedly installed on movable seat (5), and the outer surface thereof is fixedly connected with heat dissipation shell (7); Rotary shaft (11), one end of the rotary shaft (11) is fixedly connected with the output end of motor (8), and the other end is movably penetrated through fixed frame (21); The first bevel gear (29) is fixedly connected to the end of the rotating shaft (11) and engaged with all the second bevel gears (30) for synchronously driving all the lead screws (23) to rotate.

6. A polyethylene outer anticorrosive coating spraying device according to claim 5, characterized in that: Both sides of the base (1) are provided with two telescopic grooves (20), and the bottom of each movable seat (5) is fixedly connected with a telescopic block (19) in sliding fit with the telescopic groove (20).

7. A polyethylene outer anticorrosive coating spraying device according to claim 6, characterized in that: Both sides of each mounting rack (2) are provided with a plurality of insertion holes (9), and the opposite ends of each movable seat (5) are fixedly connected with a plurality of insertion blocks (10), when the movable seats (5) are moved towards each other to be folded, the insertion blocks (10) are inserted into the corresponding insertion holes (9) to be positioned and locked.

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