Internal and external epoxy plastic coating production equipment and 3PE anti-corrosion equipment winding production line

Abstract

The utility model provides internal and external epoxy plastic coating production equipment and a 3PE anti-corrosion equipment winding production line, and relates to the technical field of steel pipe corrosion prevention. The internal and external epoxy plastic coating production equipment comprises a powder spraying chamber, a heating device, a conveying device, an external spraying device and an internal spraying device. The powder spraying chamber is provided with a spraying channel for a to-be-machined pipe to pass through, and the heating device is located on the inlet side of the spraying channel. The conveying device is arranged on the side, away from the powder spraying chamber, of the heating device and used for sequentially conveying the pipe to be machined to the heating device and the powder spraying chamber. The outer spraying device is installed in the spraying channel and used for spraying materials to the outer wall face of the pipe to be machined. The inner spraying device is located on the side, away from the heating device, of the conveying device, and the inner spraying device is used for stretching into a pipe cavity of the to-be-machined pipe located on the conveying device and can spray materials to the inner wall face of the to-be-machined pipe when reaching the spraying channel. The equipment can perform internal and external spraying at the same time, and is high in operation efficiency and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe anti-corrosion, and particularly to an internal and external epoxy coating production device and a winding production line of 3PE anti-corrosion equipment. Background Art

[0002] Spraying is a coating method in which materials are dispersed into uniform and fine droplets by means of a spray gun or a disc atomizer with the aid of pressure or centrifugal force and applied to the surface of the object to be coated. Among them, spraying generally includes air spraying, airless spraying, electrostatic spraying, etc. Spraying technology is applied to all aspects of people's production and processing and plays an important role in people's production and life. For example, when performing 3PE anti-corrosion treatment on water supply and drainage steel pipes, generally, the steel pipes are first preheated and heated up. After the steel pipes reach the required temperature, epoxy powder is sprayed on the inner and outer surfaces, and then processes such as sticking resin and polyethylene resin winding are carried out.

[0003] After research by the inventor, it is found that the existing steel pipe spraying anti-corrosion technology has the following disadvantages:

[0004] For the process of spraying internal and external epoxy powder on the 3PE anti-corrosion steel pipes of the prior art, generally, two processes are required for spraying and winding operations. First, the steel pipes are placed on the internal and external epoxy coating equipment to apply the epoxy coating on the inner wall of the steel pipes. Then, the steel pipes are transferred to the 3PE production line for external surface spraying and winding of the hot melt adhesive layer. The biggest difference between the two processes is that the current technology cannot perform continuous operations for applying the epoxy coating on the inner wall of the steel pipes. Only intermittent spraying and winding operations can be carried out one by one for each steel pipe. When winding the hot melt adhesive layer on the outer layer of the 3PE steel pipes, no interruption or pause is allowed. If there is a gap or pause between the steel pipes, the hot melt adhesive will lose weight and sag, and it will no longer be possible to continue winding it onto the outer wall of the steel pipes. It is necessary to use manual guidance to adjust and wind the adhesive when restarting the machine, which not only takes time and effort but also wastes raw materials. Therefore, during normal operation, when entering the 3PE winding station, each steel pipe must be connected end to end continuously. The 3PE anti-corrosion production line only performs external anti-corrosion coating and can accelerate through the trailing roller group to meet the end-to-end connection of the steel pipes. Moreover, when winding the hot melt adhesive, it must be carried out before the epoxy coating is completely cured. Otherwise, the adhesion effect between the hot melt adhesive layer and the epoxy coating will be unstable. Therefore, only by ensuring that the steel pipes have sufficient residual temperature can the adhesion effect between the hot melt adhesive and the epoxy coating be ensured. Therefore, with the current production technology, the 3PE steel pipes can only be processed in two separate processes to ensure product quality. Moreover, for both processes, the steel pipes need to be preheated and heated to about 200 degrees before spraying and winding operations can be carried out. Therefore, the repeated handling and heating of the steel pipes not only waste energy but also take time and effort, resulting in low efficiency in processing the anti-corrosion coating of the steel pipes. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide an internal and external epoxy coating production equipment and a 3PE anti-corrosion equipment winding production line, which can simultaneously perform spraying and winding operations on the outer wall surface and inner wall surface of pipes and other pipe materials, improve the spraying efficiency, improve the pipe processing efficiency, and save the processing cost.

[0006] The embodiments of the present utility model are implemented as follows:

[0007] In a first aspect, the present utility model provides an internal and external epoxy coating production equipment, including:

[0008] A powder spraying chamber, a heating device, a conveying device, an external spraying device, and an internal spraying device; the powder spraying chamber is provided with a spraying channel for the pipe material to be processed to pass through, and the heating device is located on the inlet side of the spraying channel; the conveying device is arranged on the side of the heating device away from the powder spraying chamber for sequentially conveying the pipe material to be processed to the heating device and the powder spraying chamber; the external spraying device is installed in the spraying channel for spraying the material onto the outer wall surface of the pipe material to be processed; the internal spraying device is located on the side of the conveying device away from the heating device, and the internal spraying device is used to extend into the lumen of the pipe material to be processed located on the conveying device and can spray the material onto the inner wall surface of the pipe material to be processed when reaching the spraying channel.

[0009] In an alternative embodiment, the internal spraying device includes a traveling mechanism and an internal spraying mechanism, the internal spraying mechanism is installed on the traveling mechanism, and the traveling mechanism is used to drive the internal spraying mechanism to move relative to the powder spraying chamber in a first direction or a second direction opposite to the first direction, so that the internal spraying mechanism can switch between the states of entering or leaving the powder spraying chamber.

[0010] Based on the above solution, by driving the internal spraying mechanism to move in the first direction or the second direction through the traveling mechanism, the position of the internal spraying mechanism relative to the pipe material to be processed can be adjusted according to the operation progress requirements, thereby ensuring the accuracy of the position of the internal spraying mechanism and the pipe material to be processed, facilitating the simultaneous internal and external spraying and winding operations on the pipe material to be processed by using the internal spraying mechanism and the external spraying device, and improving the operation efficiency. At the same time, since the position of the internal spraying mechanism can be adjusted as needed, it is not easy to interfere with the conveying of the pipe material to be processed, and they do not interfere with each other, and the entire equipment runs stably and reliably.

[0011] In an alternative embodiment, the traveling mechanism includes a first track and a first traveling vehicle, the first traveling vehicle is slidably installed on the first track in the first direction or the second direction, and the internal spraying mechanism is installed on the first traveling vehicle.

[0012] Based on the above solution, the first traveling vehicle can operate under the guidance of the first track. The first traveling vehicle runs stably and reliably, the internal spraying mechanism runs stably and reliably, and at the same time, the position of the internal spraying mechanism relative to the pipe to be processed is stable and reliable, and problems such as collisions are not likely to occur, and the failure rate is low.

[0013] In an alternative embodiment, the traveling mechanism further includes a second track and a second traveling vehicle. The second traveling vehicle is slidably mounted on the second track in a first direction or a second direction, and the first track is mounted on the second traveling vehicle.

[0014] Based on the above solution, through the cooperation of the first traveling vehicle and the second traveling vehicle, the position of the internal spraying mechanism relative to the pipe to be processed can be quickly adjusted, thereby improving the spraying efficiency and reducing the probability of collision between the internal spraying mechanism and the pipe to be processed.

[0015] In an alternative embodiment, the traveling mechanism further includes a counterweight. The counterweight is mounted on the first traveling vehicle, and the counterweight is located on a side of the internal spraying mechanism away from the powder spraying chamber.

[0016] Based on the above solution, the counterweight can keep the weights at the front and rear ends of the first traveling vehicle balanced, improve the stability of the first traveling vehicle, and prevent the first traveling vehicle from tipping over when walking on the first track, thereby ensuring the smooth progress of the spraying and winding operation.

[0017] In an alternative embodiment, the internal spraying mechanism includes a spray rod and at least one set of powder spray heads mounted on the spray rod.

[0018] Based on the above solution, by providing the spray rod, when the traveling mechanism drives the spray rod to move, the spray rod can be inserted into the lumen of the pipe to be processed, so that the powder spray heads move to the front in the moving direction of the pipe to be processed. During the advancement of the pipe to be processed, the material sprayed by the powder spray heads can adhere to the inner wall surface of the pipe to be processed, thereby realizing the spraying of the inner wall surface of the pipe to be processed.

[0019] In an alternative embodiment, the internal and external epoxy coating production equipment further includes a loading device. The loading device is provided at a side of the conveying device and is used to transfer the pipe to be processed onto the conveying device.

[0020] Based on the above solution, by providing the loading device at a side of the conveying device, while realizing automatic loading through the loading device, it does not affect the installation and operation of the internal spraying device located behind the conveying device. That is, the internal spraying device and the loading device are respectively distributed behind and at the side of the conveying device, reasonably utilizing the space around the conveying device, improving the space utilization rate, and the installation positions of the internal spraying device and the loading device do not interfere with each other and do not affect each other, which is beneficial to the normal operation of the entire equipment.

[0021] In a second aspect, the present utility model provides a 3PE anti-corrosion equipment winding production line, which includes:

[0022] a 3PE winding equipment and the internal and external epoxy coating production equipment described in any one of the foregoing embodiments, and the powder spraying chamber is arranged on the inlet side of the 3PE winding equipment.

[0023] In an optional embodiment, the 3PE winding equipment includes a winding chamber, a pressure roller assembly, a first extruder, and a second extruder. The winding chamber is arranged on a side of the powder spraying chamber away from the heating device; the pressure roller assembly is installed in the winding chamber, both the first extruder and the second extruder are connected to the winding chamber, the winding chamber is used for a pipe to be processed to pass through, and the pressure roller assembly is used to rotate under the action of the pipe to be processed.

[0024] Based on the above solution, when the pipe to be processed after internal and external spraying moves into the winding chamber, the front end of the pipe to be processed first passes through the first extruder. The first extruder extrudes and winds the sheet-shaped adhesive resin onto the outer epoxy coating surface of the pipe to be processed. The pressure roller assembly contacts the adhesive resin. Under the action of friction, the pipe to be processed drives the pressure roller assembly to rotate at a substantially equal linear speed. The extrusion force formed between the two can fully discharge the air between the pipe to be processed and the adhesive resin, so that the adhesive resin is fully bonded to the outer epoxy coating surface of the pipe to be processed. Then, as the pipe to be processed continues to run, the pipe to be processed passes through the second extruder. The second extruder winds the sheet-shaped polyethylene melt glue onto the outer adhesive resin glue layer surface of the pipe to be processed, which is basically the same as the process of winding the adhesive resin in the previous process. With the cooperation of the pipe to be processed and the pressure roller assembly, the sheet-shaped polyethylene is fully adhered and wound onto the outer adhesive resin glue layer surface of the pipe to be processed.

[0025] In an optional embodiment, the 3PE anti-corrosion equipment winding production line further includes a cooling device, and the cooling device is arranged on a side of the 3PE winding equipment away from the powder spraying chamber.

[0026] Based on the above solution, the pipe to be processed after processing leaves the 3PE winding chamber and passes through the cooling device. The cooling device exchanges heat between the refrigerant and the pipe to be processed to reduce the temperature of the pipe that has completed the anti-corrosion operation, and can realize the skin crystallization and shaping of the 3PE steel pipe.

[0027] The beneficial effects of the embodiments of the present utility model are:

[0028] In summary, the internal and external epoxy coating production equipment provided by this embodiment arranges an external spraying device and an internal spraying device on the same production line. When the pipe to be processed is subjected to spraying and winding operations, the external spraying device and the internal spraying device can continuously operate without interruption at the same time, so that the outer wall surface and the inner wall surface of the pipe to be processed can be subjected to spraying and winding operations at the same time, improving the spraying efficiency, the processing efficiency of the pipe to be processed, and reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic diagram of the winding production line of the 3PE anti-corrosion equipment according to the embodiment of the present invention;

[0031] Figure 2 It is a partial schematic diagram of the winding production line of the 3PE anti-corrosion equipment according to the embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the internal spraying device according to the embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the conveying device according to the embodiment of the present invention;

[0034] Figure 5 It is a schematic diagram of the unloading equipment according to the embodiment of the present invention.

[0035] ICON:

[0036] 001 - Pipe to be processed; 002 - First direction; 003 - Second direction; 100 - Powder spraying chamber; 200 - Heating device; 300 - Conveying device; 310 - Bracket; 320 - Driving wheel; 330 - Support arm; 400 - External spraying device; 500 - Internal spraying device; 510 - Traveling mechanism; 511 - First track; 512 - First traveling vehicle; 513 - Second track; 514 - Second traveling vehicle; 515 - Counterweight; 520 - Internal spraying mechanism; 521 - Spray rod; 522 - Powder spray head; 600 - Loading device; 700 - Winding chamber; 710 - Pressing wheel assembly; 720 - First extruder; 730 - Second extruder; 740 - Working driving wheel group; 800 - Unloading driving wheel group; 810 - Unloading rack. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0040] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0041] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0042] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] In the prior art, when performing internal and external anti-corrosion treatment on pipe materials such as steel pipes, it is generally necessary to perform spraying and winding operations on both the inner wall surface and the outer wall surface of the steel pipe. In particular, the method adopted for 3PE anti-corrosion of steel pipes is to perform spraying successively. Currently, the benefit of continuous operation for internal and external anti-corrosion cannot be achieved. For example, the inner wall surface of the steel pipe can be batch-sprayed individually first, and then the outer wall surface of the steel pipe can be continuously sprayed without interruption. The internal and external spraying are carried out separately one after another, or it is impossible to perform continuous operation for single-piece internal and external anti-corrosion, which is time-consuming and laborious and has low efficiency. At the same time, separate heaters need to be configured for both internal and external spraying, resulting in large power consumption and high costs.

[0044] In view of this, the designer provides an internal and external epoxy coating and 3PE steel pipe anti-corrosion production device, which can simultaneously perform internal and external spraying and 3PE winding operations on the pipe material, improve the spraying efficiency, save the heating step, save energy, and reduce the processing and manufacturing cost.

[0045] In this embodiment, it should be noted that the pipe material 001 to be processed can be a steel pipe or other pipe materials. In this embodiment, a steel pipe with a circular ring-shaped cross-section is taken as an example for illustration.

[0046] Please refer to Figure 1 and Figure 2 , in this embodiment, the internal and external epoxy coating production device includes a powder spraying chamber 100, a heating device 200, a conveying device 300, an external spraying device 400, and an internal spraying device 500. The powder spraying chamber 100 is provided with a spraying channel for the pipe material 001 to be processed to pass through, and the heating device 200 is located on the inlet side of the spraying channel; the conveying device 300 is arranged on the side of the heating device 200 away from the powder spraying chamber 100 for sequentially conveying the pipe material 001 to the heating device 200 and the powder spraying chamber 100; the external spraying device 400 is installed in the spraying channel for spraying materials onto the outer wall surface of the pipe material 001 to be processed; the internal spraying device 500 is located on the side of the conveying device 300 away from the heating device 200. The internal spraying device 500 is used to extend into the lumen of the pipe material 001 located on the conveying device 300 and can spray materials onto the inner wall surface of the pipe material 001 when reaching the spraying channel.

[0047] Based on the above solution, the working mode of the internal and external epoxy coating production device provided in this embodiment is as follows:

[0048] Before processing the steel pipe, the inner and outer wall surfaces of the steel pipe can be pretreated by shot blasting rust removal using a rust removal device to meet the set requirements. Then, the pretreated steel pipe is transported to the conveying device 300. After the conveying device 300 is started, it can drive the steel pipe to rotate around its own axis while advancing close to the heating device 200. The advancing speed and the self-rotation speed of the steel pipe can be adjusted as needed, and no specific limitation is made in this embodiment. When the steel pipe moves to the heating device 200, the heating device 200 heats the steel pipe. The heated steel pipe enters the powder spraying chamber 100, and the outer spraying device 400 and the inner spraying device 500 are started simultaneously. The outer spraying device 400 can spray the outer wall surface of the steel pipe, and the inner spraying device 500 can spray the inner wall surface of the steel pipe. In this way, the simultaneous internal and external spraying and winding operation is realized, and the spraying efficiency and the processing efficiency are high. Since the steel pipe can be internally and externally sprayed simultaneously after passing through the heating device 200, compared with the case where the steel pipe needs to be heated multiple times when spraying internally and externally separately, the heating steps can be saved, the energy can be saved, and the cost can be reduced accordingly.

[0049] The following embodiments illustrate the details of the internal and external epoxy coating production equipment provided by the present application by way of examples.

[0050] Please refer to Figures 1 - 4 , in this embodiment, optionally, the internal and external epoxy coating production equipment includes a powder spraying chamber 100, a heating device 200, a conveying device 300, an outer spraying device 400, an inner spraying device 500, and a feeding device 600. The powder spraying chamber 100, the heating device 200, and the conveying device 300 are arranged in sequence. Both the outer spraying device 400 and the inner spraying device 500 can cooperate with the powder spraying chamber 100 to simultaneously perform the internal and external spraying and winding operations on the steel pipe heated by the heating device 200. The feeding device 600 can automatically transport the steel pipe to the conveying device 300 to realize continuous operation.

[0051] In this embodiment, optionally, the powder spraying chamber 100 is provided with a spraying channel. The shape of the spraying channel is set as needed. The side of the spraying channel close to the heating device 200 can be the inlet side, and the opposite side can be the outlet side. The steel pipe can enter from the inlet side and leave from the outlet side. The moving direction of the steel pipe from the inlet side to the outlet side can be called the first direction 002. Correspondingly, the direction from the outlet side to the inlet side can be called the second direction 003. The first direction 002 is opposite to the second direction 003, and the movement of the steel pipe in the first direction 002 is the forward movement.

[0052] In this embodiment, optionally, the heating device 200 can be configured as an intermediate frequency heating coil structure, and its structure and working principle can refer to the existing well-known technologies. In this embodiment, in order to avoid redundant narration, no detailed introduction will be given. The heating device 200 is arranged on the inlet side of the powder spraying chamber 100, and the two can be butted together to improve the compactness of the overall structure.

[0053] Obviously, in other embodiments, the heating device 200 can also be of other structures.

[0054] In addition, a set of conveying wheels 320 can also be arranged at the heating device 200 to ensure that the steel pipe can pass through the heating device 200, the powder spraying chamber 100 smoothly and reach the subsequent processes. That is, in order to realize the continuous conveying of the steel pipe, multiple sets of conveying wheels 320 can be arranged on the traveling route.

[0055] In this embodiment, optionally, the conveying device 300 includes a bracket 310 and multiple pairs of conveying wheels 320. The bracket 310 can be fixed on the ground. The multiple pairs of conveying wheels 320 are arranged at intervals in the first direction 002 and are rotatably installed on the top of the bracket 310. The two conveying wheels 320 of each pair are arranged at intervals in the width direction of the bracket 310, that is, in the direction perpendicular to the first direction 002. The rotation axis of each conveying wheel 320 forms an angle with the first direction 002, that is, the axis of each conveying wheel 320 is inclined. The multiple pairs of conveying wheels 320 cooperate to drive the steel pipe forward and rotate around its own axis at the same time. The forward speed and the rotation speed of the steel pipe can be set as required, and no specific limitation is made in this embodiment.

[0056] Furthermore, a support arm 330 can be arranged on the bracket 310. The support arm 330 plays a role in supporting the loading and unloading of the steel pipe, and improves the stability and reliability of the steel pipe during the conveying process.

[0057] In addition, the number of pairs of the conveying wheels 320 can be set as required, and no specific limitation is made in this embodiment.

[0058] It should be understood that both the inclination angle and the rotation speed of the conveying wheels 320 can be adjusted as required, so as to adjust the forward speed and the rotation speed of the steel pipe to adapt to different scenario requirements.

[0059] In this embodiment, optionally, the external spraying device 400 is installed in the spraying channel. The structure of the external spraying device 400 can refer to the existing well-known technologies. No specific limitation is made in this embodiment, as long as it can spray the material on the outer wall of the steel pipe. It should be understood that since the steel pipe rotates while moving forward, when the steel pipe passes through the external spraying device 400, the material sprayed by the external spraying device 400 can evenly cover the outer surface of the steel pipe.

[0060] It should be understood that the number of spraying outlets of the external spraying device 400 can be one or more.

[0061] Please combine Figure 1 and Figure 4 In this embodiment, optionally, the internal spraying device 500 includes a traveling mechanism 510 and an internal spraying mechanism 520. The internal spraying mechanism 520 is installed on the traveling mechanism 510. The traveling mechanism 510 is arranged at the rear end of the conveying device 300, that is, the traveling mechanism 510 is arranged on the side of the conveying device 300 away from the heating device 200. The traveling mechanism 510 is used to drive the internal spraying mechanism 520 to move relative to the powder spraying chamber 100 in the first direction 002 or the second direction 003 opposite to the first direction 002, so that the internal spraying mechanism 520 can be switched between the states of entering or leaving the powder spraying chamber 100. Specifically, before the steel pipe port enters the powder spraying chamber 100 at the initial startup, the traveling mechanism 510 first drives the internal spraying mechanism 520 to move forward along the first direction 002, and the speed of the internal spraying mechanism 520 is greater than the forward speed of the steel pipe. It can ensure that when the internal spraying mechanism 520 enters the lumen of the steel pipe and moves along the first direction 002, it arrives at the powder spraying chamber 100 earlier than the steel pipe, so as to prepare for the spraying work. When the spraying and winding operation meets the requirements, the traveling mechanism 510 is started again to drive the internal spraying mechanism 520 to exit the powder spraying chamber 100 along the second direction 003 and return to the initial position, ensuring that the movement of the internal spraying device 500 and the feeding device 600 will not interfere with each other.

[0062] Please combine Figure 1 and Figure 4, Optionally, the traveling mechanism 510 includes a first track 511, a first traveling vehicle 512, a second track 513, a second traveling vehicle 514, and a counterweight 515. There may be two first tracks 511, both extending along the first direction 002. The two first tracks 511 are both installed on the second traveling vehicle 514 and are arranged parallel to each other. The first traveling vehicle 512 is slidably engaged with the two first tracks 511 in the first direction 002. The number of the second tracks 513 is two and they extend in the first direction 002. The two second tracks 513 are arranged in parallel at intervals. The second traveling vehicle 514 is slidably engaged with the two second tracks 513 in the first direction 002. The inner spraying mechanism 520 is installed on the top of the first traveling vehicle 512. The counterweight 515 is installed at the tail of the first traveling vehicle 512. With such a design, the first traveling vehicle 512 and the second traveling vehicle 514 can cooperate to drive the inner spraying mechanism 520 to move in the first direction 002 and the second direction 003, which is beneficial to adjusting the position of the inner spraying mechanism 520 relative to the steel pipe. It is not only convenient to ensure that the tail end of the steel pipe at the front end can be evenly sprayed, but also can quickly avoid the subsequent steel pipes to be sprayed, so that the subsequent steel pipes can quickly reach the conveying device 300, and the steel pipes at the rear can be docked with the steel pipes at the front end to realize the continuous operation of multiple steel pipes. That is to say, after the previous steel pipe is sprayed, the subsequent steel pipe needs to enter the conveying device 300 from the feeding device 600. However, since the inner spraying mechanism 520 occupies the space above the conveying device 300 for placing the steel pipe, directly transferring the steel pipe to the conveying device 300 will cause interference between the steel pipe and the inner spraying mechanism 520. Therefore, the second traveling vehicle 514 can be used to quickly retract the inner spraying mechanism 520 along the second direction 003, so as to ensure that the subsequent steel pipes can smoothly reach the conveying device 300 and be connected with the previous steel pipe.

[0063] It should be understood that except for the first steel pipe spraying, the first traveling vehicle 512 will not drive the powder spraying head 522 to advance along the first direction 002. During the subsequent steel pipe spraying, the first traveling vehicle 512 will drive the powder spraying head 522 to advance along the first direction 002 to catch up with the unsprayed working surface of the front-end steel pipe. Under the action of the first traveling vehicle 512, the powder spraying head 522 will exceed the original set spraying position of the powder spraying head 522 in the powder spraying chamber 100 during the spraying of the first steel pipe until the powder spraying head 522 reaches the required connecting spraying position. Then, the first traveling vehicle 512 can retract along the second direction 003 and return to the initial position in the powder spraying chamber 100 when spraying the first steel pipe. During the retraction process, the inner spraying of the steel pipe is carried out.

[0064] It should be noted that limit switches can be provided on both the first track 511 and the second track 513. For example, on the first track 511, a front switch and a rear switch can be arranged at intervals in the extending direction of the first track 511. The forward movement limit distance of the first walking vehicle 512 is controlled by the front switch, and the backward movement limit distance of the first walking vehicle 512 is controlled by the rear switch. Similarly, switches for controlling the front and rear positions of the second walking vehicle 514 can be provided on the second track 513, which will not be specifically described in this embodiment.

[0065] Furthermore, the inner spraying mechanism 520 includes a spray rod 521 and at least one set of powder spray heads 522 mounted on the spray rod 521. One end of the spray rod 521 is mounted at the front end of the first walking vehicle 512, and the other end of the spray rod 521 is provided with two sets of powder spray heads 522 arranged in sequence in the length direction of the spray rod 521. The two sets of powder spray heads 522 are adjacent and in contact, which can be understood as the two sets of powder spray heads 522 being arranged adjacent to each other on the axis parallel to the spray rod 521. Since the spray rod 521 needs to extend into the steel pipe, the length of the spray rod 521 is relatively long, and the downward rotation torque of the powder spray heads 522 acting on the first walking vehicle 512 is relatively large. By configuring the counterweight 515, the torque exerted by the powder spray heads 522 on the first walking vehicle 512 can be balanced, thereby improving the stability of the first walking vehicle 512. By providing two sets of powder spray heads 522, it can ensure that the inner wall surface of the front-end steel pipe is evenly sprayed when compensating for the stroke of the front-end steel pipe. It should be understood that in other embodiments, the number of powder spray heads 522 can be set as required.

[0066] In this embodiment, optionally, the feeding device 600 is arranged on the side of the conveying device 300. The feeding device 600 can transfer the steel pipe onto the conveying device 300, and its specific structure can refer to the existing well-known structure. For example, the steel pipe can also be conveyed onto the conveying device 300 by means of a manipulator, and any structure that can place the steel pipe on the conveying device 300 is acceptable, which will not be specifically limited in this embodiment. Since the feeding device 600 is arranged on the side of the conveying device 300, the feeding device 600 and the inner spraying device 500 make reasonable use of the space around the conveying device 300, and the feeding device 600 and the inner spraying device 500 are not likely to interfere with each other, and the operation is stable and reliable.

[0067] The internal and external epoxy coating production equipment provided in this embodiment can simultaneously and continuously perform internal and external spraying and winding operations, with high spraying efficiency, high steel pipe processing efficiency, and low cost.

[0068] Please combine Figures 1 - 5This embodiment also provides a 3PE anti-corrosion equipment winding production line, which includes a 3PE winding device, a cooling device (not shown), a discharging device and the internal and external epoxy coating production equipment provided in the above embodiment, and the powder spraying room 100 is arranged at the inlet side of the 3PE winding device. The cooling device is located between the discharging device and the 3PE winding device. After passing through the internal and external epoxy coating production equipment, the steel pipe enters the 3PE winding device, then passes through the cooling device, and finally enters the discharging device.

[0069] Among them, the 3PE winding equipment includes a winding chamber 700, a pressure wheel assembly 710, a first extruder 720, a second extruder 730 and a working conveying wheel group 740. The winding chamber 700 is docked with the outlet side of the powder spraying chamber 100, and a pressure wheel assembly 710 is arranged in the winding chamber 700. Two groups of pressure wheel assemblies 710 can be arranged, corresponding to the first extruder 720 and the second extruder 730 respectively. The first extruder 720 and the second extruder 730 are both connected to the winding chamber 700, and the winding chamber 700 is used for the pipe 001 to be processed to pass through, and the pressure wheel assembly 710 is used to rotate under the action of the pipe 001 to be processed. The first extruder 720 is used to extrude adhesive resin to the surface of the steel pipe, and the second extruder 730 is used to extrude polyethylene melt to the surface of the steel pipe. After the steel pipe comes out of the powder spraying chamber 100, it first passes through the first extruder 720 and then passes through the second extruder 730. The working transmission wheel set 740 cooperates with the winding chamber 700 to provide power for the steel pipe to move forward, so that the steel pipe moves toward the cooling device after passing through the winding chamber 700.

[0070] Optionally, the structure of the working conveying wheel set 740 can be set to be the same as that of the conveying device 300, so as to enable the steel pipe to rotate while moving forward. The working conveying wheel set 740 is arranged at intervals with the conveying device 300, and can receive the steel pipe on the conveying device 300.

[0071] In this embodiment, optionally, the cooling device may be a cooling liquid spray cooling structure.

[0072] In this embodiment, the unloading device optionally includes an unloading conveying wheel set 800 and an unloading rack 810. The unloading conveying wheel set 800 is arranged at intervals with the working conveying wheel set 740 and can receive the steel pipe on the working conveying wheel set 740. The unloading rack 810 is located at the side of the unloading conveying wheel set 800.

[0073] It should be understood that during the production process, the working states of the conveying device 300, the working conveying wheel group 740 and the unloading conveying wheel group 800 can be independently controlled to adapt to different scene requirements.

[0074] The following provides an operation flow of the actual operation of the 3PE anti-corrosion equipment winding production line of an embodiment of the present application:

[0075] First, lift the qualified steel pipes onto the feeding device 600 by a crane, and use the steel pipe derusting equipment to carry out internal and external shot blasting until the specified derusting requirements are met.

[0076] After the inner and outer surfaces of the steel pipes meet the requirements, they enter the 3PE anti-corrosion equipment winding production line for processing.

[0077] The steps of steel pipe processing include, for example, taking the continuous operation of two steel pipes as an example for illustration. The two steel pipes are the front-end steel pipe and the rear-end steel pipe respectively, and the specific steps are as follows:

[0078] 1. Adjust the distance between the paired conveyor wheels 320, and adjust the parameters of the conveyor wheels 320, the heating device 200, the first extruder 720 and the second extruder 730;

[0079] 2. Use a pipe turning device or a manipulator, etc. to place the front-end steel pipe to be operated on the conveying device 300;

[0080] 3. Since the front-end steel pipe keeps equidistant rotation in a threaded state under the drive of the conveyor wheels 320, the front-end steel pipe can pass through the heating device 200 and the powder spraying chamber 100 in sequence and at a constant speed until the discharging station at the tail end;

[0081] 4. After the front end (hereinafter referred to as the front end) of the front-end steel pipe in the traveling direction reaches the heating device 200, start the inner spraying device 500. Since the front-end steel pipe moves forward at a "turtle speed", that is, the spiral winding 3PE production line is in normal production, the axial linear distance generally does not exceed 1 meter per minute. Otherwise, the hot-melt adhesive epidermis wound on the outer layer of the steel pipe has not crystallized and will deform when bearing the weight of the steel pipe when reaching the spraying roller. Therefore, by adjusting the speed of the second traveling vehicle 514, the powder spraying head 522 of the inner spraying device 500 can catch up with the front end of the front-end steel pipe in a short time (for example, within a few seconds). The powder spraying head 522 can enter the powder spraying chamber first, and the second traveling vehicle 514 stops moving after the powder spraying head 522 reaches the set position. During this process, the first traveling vehicle 512 is in the initial position and does not move. Please refer to Figure 4 , at this time, the first traveling vehicle 512 is on the right side of the second traveling vehicle 514. This position can be understood as the initial position of the first traveling vehicle 512, that is, at the initial position, the first traveling vehicle 512 does not move forward relative to the second traveling vehicle 514. After the front end of the front-end steel pipe enters the powder spraying chamber, the outer spraying device 400 and the inner spraying device 500 can be started simultaneously to spray epoxy powder on the inner and outer layer surfaces of the front-end steel pipe;

[0082] 4.1 It should be noted that: after the end of the front steel pipe (hereinafter referred to as the end) in the advancing direction of the front steel pipe during the anti-corrosion operation leaves the conveying device 300, at this time, the powder spraying head 522 of the internal spraying device 500 stops powder spraying, and the second walking vehicle 514 retreats along the second direction 003 to the starting position. The front steel pipe and the external spraying device 400 then continue to operate normally. At this time, the inner peripheral surface of the front steel pipe is not powder-sprayed because part of the front steel pipe has not passed through the heating device 200. Therefore, powder spraying should be stopped during the backward movement of the powder spraying head 522 to avoid poor powder spraying quality. This stage can be called the first stage.

[0083] After the internal spraying device 500 retreats to the starting position, the pipe turning device is started to complete the feeding process. After the rear steel pipe is placed on the conveying device 300, the conveying speed of the conveying device 300 is increased so that the advancing speed of the rear steel pipe is greater than that of the front steel pipe until the front end of the rear steel pipe touches the end of the front steel pipe. It can be understood that the two steel pipes have been combined into one steel pipe. At this time, the speed of the conveying device 300 is adjusted so that the speed of the rear steel pipe is the same as that of the front steel pipe, and the conveying device 300 and the working conveyor wheel set 740 return to the equal-speed operation state. While the rear steel pipe is being lifted to catch up with the front steel pipe, the forward switches of the first walking vehicle 512 and the second walking vehicle 514 of the internal spraying device 500 are also activated. At this time, both the first walking vehicle 512 and the second walking vehicle 514 quickly advance along the first direction 002, the spray rod 521 is inserted into the rear steel pipe, and the powder spraying head 522 passes through the rear steel pipe and advances rapidly towards the front steel pipe. When the second walking vehicle 514 travels to the set distance, that is, the same distance as when it first cooperates with the front steel pipe, the second walking vehicle 514 stops moving. Since the front steel pipe is not internally powder-sprayed at the position of the backward movement of the powder spraying head 522, and after the feeding of the rear steel pipe is completed, the powder spraying head 522 advances to catch up with the inner coating position of the front steel pipe. During the whole process, the distance traveled by the front steel pipe is equal to the distance that the first walking vehicle advances relative to the second walking vehicle 514, or the distance traveled by the front steel pipe is not greater than the distance that the first walking vehicle 512 advances relative to the second walking vehicle 514, so that the first walking vehicle 512 drives the powder spraying head 522 to catch up and connect with the inner powder coating of the front steel pipe, which can slightly exceed the non-sprayed position of the front steel pipe or be flush with the sprayed coating of the front steel pipe. In this embodiment, optionally, the distance that the first walking vehicle 512 advances exceeds the non-sprayed position of the front steel pipe. This stage can be called the second stage.

[0084] The third stage is then carried out, that is, when the powder spraying head 522 on the first carriage 512 catches up with the coating of the front end steel pipe, the powder spraying head 522 is opened, and the first carriage 512 starts to retreat until it retreats to a position on the right side of the second carriage 514. During the retreat of the first carriage 512, both groups of powder spraying heads 522 are opened, and the inner circumference of the front end steel pipe is sprayed with powder at the same time. The reason is that, generally speaking, the amount of powder sprayed by each group of powder spraying heads 522 is certain. Since the front end steel pipe continues to advance in the third stage, the powder spraying head 522 retreats relative to the front end steel pipe at the same time, resulting in the front end steel pipe The speed of the relative advancement of the powder spraying head 522 is twice the speed of the relative advancement of the front end steel pipe relative to the powder spraying head 522 in the first stage. Therefore, the two groups of powder spraying heads 522 are opened at the same time to ensure that the amount of powder sprayed is increased by the same amount under the premise of increasing the speed, so that the inner circumference of the front end steel pipe that has not been sprayed is evenly sprayed. During the third stage, when the first carriage 512 returns to the initial position on the second carriage 514, one of the powder spraying heads 522 is also closed and stops spraying. At this time, it can be understood that it has returned to the initial spraying state of the first stage. At this time, the production line enters the normal spraying and winding operation state, that is, a seamless spraying operation of the internal spraying device 500 is completed. This repetitive cycle operation can meet the requirement that the winding part of the production line continues to operate seamlessly.

[0085] It should be understood that, at the junction of the sprayed steel pipe, since the travel distance of the first traveling vehicle 512 has been set to slightly exceed the axial travel distance of the steel pipe in one conversion cycle of the traveling mechanism 510, the epoxy coating at the connection can achieve a seamless connection effect, that is, the thickness of the sprayed layer can fully meet the relevant standards. Also, since the conversion cycle of the traveling mechanism 510 is short, generally completed within tens of seconds, the temperature lost by the inner surface of the steel pipe is almost negligible relative to the temperature required for the curing of the epoxy coating, and therefore will not affect the quality of the epoxy coating in the inner cavity of the steel pipe at all.

[0086] It should be understood that when the internal spraying device 500 starts spraying from the front end of each steel pipe, it is sufficient to open one set of powder spraying heads 522. Generally, when the steel pipe is sprayed during the retreat of the first traveling vehicle 512, two sets of powder spraying heads 522 are opened at the same time.

[0087] 5. After the outer surface of the steel pipe is sprayed with epoxy powder and continues to run under the working conveyor wheel set, it reaches the bonding resin winding station. Then, the sheet-shaped bonding melt extruded from the first extruder 720 is wound onto the epoxy coating on the outer surface of the steel pipe. At the same time, the pressure roller with the required pressure adjusted at the bottom is raised. The pressure roller can be a silicone roller. Due to the self-rotation movement of the steel pipe, after the steel pipe contacts the silicone roller, the silicone roller is driven to rotate at almost the same linear speed under the action of friction. The extrusion force formed between the two fully discharges the air between the epoxy coating on the steel pipe surface and the adhesive resin, enabling the adhesive resin to fully bond with the epoxy coating on the steel pipe surface;

[0088] 6. Under the conveying operation of the roller set, when the steel pipe wound with the adhesive reaches the polyethylene winding station, the sheet-shaped polyethylene melt extruded from the second extruder 730 is continuously wound onto the adhesive resin layer on the outer surface of the steel pipe. Similarly to the start of winding the adhesive resin, the sheet-shaped polyethylene is fully wound and adhered to the outermost surface of the steel pipe;

[0089] 7. Under the continuous operation of the working conveyor wheel set 740, the processed 3PE pipe passes through the coolant spraying area until the skin crystallizes and solidifies. Then, the steel pipe is transported to the position where the unloading rack is located through the unloading conveyor wheel set 800. It should be noted that to ensure the continuous operation of the 3PE production line, the speeds of the three parts of the conveying device 300, the working conveyor wheel set 740, and the unloading conveyor wheel set 800 are independently controlled. During normal production, the speeds of the three groups are designed to be the same. When continuously producing, the front and rear steel pipes must be well connected. If the connection gap is too large, the "wire break" phenomenon will occur in the winding melt section, and manual operation similar to starting the machine manually is required. Therefore, when the end of the pipe being anti-corrosion treated leaves the front end of the conveying device 300, the subsequent pipe to be processed immediately enters the conveying device 300, but they cannot overlap. Therefore, when the next steel pipe is placed in the conveying device 300, there will definitely be a gap with the previous steel pipe. At this time, the jog acceleration button should be pressed to accelerate the operation of the conveying device 300 until the pipe head of the subsequent steel pipe "collides with" the pipe tail of the previous steel pipe. When unloading the pipe, it is the opposite. The previous steel pipe is accelerated to run away until it is a certain distance away from the subsequent steel pipe because the steel pipe lifted during pipe turning and unloading does not continue to move forward.

[0090] 8. After production is completed, the processed 3PE anti-corrosion pipe is turned to the next processing station using the set device, and then the two ends of the pipe are polished.

[0091] IV. Finally, the qualified finished pipes are marked manually and delivered to the warehouse.

[0092] The 3PE anti-corrosion equipment winding production line provided by this embodiment combines the existing internal and external epoxy spraying equipment and 3PE pipe anti-corrosion equipment into one production line. Therefore, the production of 3PE anti-corrosion steel pipes can be completed on one production line. The work of the original two teams can now be completed by only one team. The intermediate frequency heating only needs to be heated once to complete. The costs such as handling, site, labor, power, and time can be saved by half. Especially the power consumption of the intermediate frequency heating equipment accounts for more than half of the total power during normal production. The large-power intermediate frequency heating equipment consumes more than ten thousand degrees of electricity a day. Therefore, this new equipment benefits the country and the people in terms of energy conservation and consumption reduction, and the value it creates is very considerable.

[0093] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An internal and external epoxy coated production device, characterized in that Including: A powder spraying chamber (100), a heating device (200), a conveying device (300), an external spraying device (400) and an internal spraying device (500); the powder spraying chamber (100) is provided with a spraying channel for a pipe to be processed (001) to pass through, and the heating device (200) is located on the inlet side of the spraying channel; the conveying device (300) is arranged on the side of the heating device (200) away from the powder spraying chamber (100) for sequentially conveying the pipe to be processed (001) to the heating device (200) and the powder spraying chamber (100); the external spraying device (400) is installed in the spraying channel for spraying materials onto the outer wall surface of the pipe to be processed (001); the internal spraying device (500) is located on the side of the conveying device (300) away from the heating device (200), and the internal spraying device (500) is used to extend into the lumen of the pipe to be processed (001) located on the conveying device (300) and can spray materials onto the inner wall surface of the pipe to be processed (001) when reaching the spraying channel. The internal spraying device (500) includes a traveling mechanism (510) and an internal spraying mechanism (520), the internal spraying mechanism (520) is installed on the traveling mechanism (510), and the traveling mechanism (510) is used to drive the internal spraying mechanism (520) to move relative to the powder spraying chamber (100) in a first direction (002) or a second direction (003) opposite to the first direction (002), so as to switch the internal spraying mechanism (520) between the states of entering or leaving the powder spraying chamber (100). The traveling mechanism (510) includes a first track (511) and a first traveling vehicle (512), the first traveling vehicle (512) is slidably installed on the first track (511) in the first direction (002) or the second direction (003), and the internal spraying mechanism (520) is installed on the first traveling vehicle (512). The traveling mechanism (510) further includes a second track (513) and a second traveling vehicle (514), the second traveling vehicle (514) is slidably installed on the second track (513) in the first direction (002) or the second direction (003), and the first track (511) is installed on the second traveling vehicle (514).

2. The internal and external epoxy coating production equipment according to claim 1, characterized in that: The traveling mechanism (510) further includes a counterweight (515), the counterweight (515) is installed on the first traveling vehicle (512), and the counterweight (515) is located on the side of the internal spraying mechanism (520) away from the powder spraying chamber (100).

3. The internal and external epoxy coating production equipment according to any one of claims 1-2, characterized in that: The internal spraying mechanism (520) includes a spray rod (521) and at least one group of powder spray heads (522) installed on the spray rod (521).

4. The internal and external epoxy coated production equipment according to claim 1, wherein: The internal and external epoxy coated production equipment further includes a feeding device (600), which is arranged on the side of the conveying device (300) and is used to transfer the pipe to be processed (001) onto the conveying device (300).

5. A 3PE anti-corrosion equipment winding production line, characterized in that, It includes: A 3PE winding equipment and the internal and external epoxy coated production equipment according to any one of claims 1-4, wherein the powder spraying chamber (100) is arranged on the inlet side of the 3PE winding equipment.

6. The 3PE anti-corrosion equipment winding production line according to claim 5, wherein: The 3PE winding equipment includes a winding chamber (700), a pressing wheel assembly (710), a first extruder (720) and a second extruder (730). The winding chamber (700) is arranged on the side of the powder spraying chamber (100) away from the heating device (200); the pressing wheel assembly (710) is installed in the winding chamber (700), and both the first extruder (720) and the second extruder (730) are connected to the winding chamber (700). The winding chamber (700) is used for the pipe to be processed (001) to pass through, and the pressing wheel assembly (710) is used to rotate under the action of the pipe to be processed (001).

7. The 3PE anti-corrosion equipment winding production line according to claim 5, wherein: The 3PE anti-corrosion equipment winding production line further includes a cooling device, which is arranged on the side of the 3PE winding equipment away from the powder spraying chamber (100).

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