Shielding system and application thereof

Abstract

The invention provides a shielding system and application thereof, and belongs to the technical field of anti-corrosion pipe production equipment. The device comprises a pipe unit, a powder spraying chamber frame body, a first mounting plate, a lifting mechanism and a shielding mechanism which are located on a production line, the pipe unit penetrates through the powder spraying chamber frame body, a powder spraying chamber is formed in the powder spraying chamber frame body, and the first mounting plate is connected with the lifting mechanism and can be driven by the lifting mechanism to ascend and descend in the vertical direction; the first mounting plate is provided with a shielding mechanism, the shielding mechanism can shield the preset area of the pipe unit and synchronously move along with the pipe unit in the axis direction of the pipe unit to penetrate through the powder spraying chamber while shielding is conducted, and then powder from the powder spraying chamber is prevented from being sprayed to the preset area. By means of the shielding system, the problems that an existing 3PE anti-corrosion pipe production process is complex, materials are wasted, and the waste generation amount is large are effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of anti-corrosion pipe production equipment, and particularly relates to a shielding system and its application. Background Art

[0002] An anti-corrosion pipe (also known as an anti-corrosion steel pipe) is a steel pipe treated with a special anti-corrosion process. Common anti-corrosion pipes include FBE anti-corrosion pipes (single-layer fused epoxy powder), 3PE anti-corrosion pipes (epoxy powder layer + copolymer adhesive layer + polyethylene layer), coal tar enamel anti-corrosion pipes, and polyurethane foam insulation anti-corrosion pipes, etc. Among them, epoxy powder is introduced into the anti-corrosion layers of both FBE anti-corrosion pipes and 3PE anti-corrosion pipes, and it is significantly superior to traditional anti-corrosion pipes in terms of adhesion and corrosion resistance, thus being widely used.

[0003] During the production process of FBE anti-corrosion pipes and 3PE anti-corrosion pipes, it is usually required to reserve a sufficient non-coated area at the pipe ends (for example, reserve a non-coated area of 10 to 15 cm along the pipe axis direction). This is because, during on-site construction, these anti-corrosion pipes are usually connected by welding (especially in the field of oil and gas transportation). If the pipe ends are coated with an epoxy powder coating, it will seriously affect the welding quality. This influence mainly comes from: 1. The high temperature generated during the welding process will cause decomposition, carbonization, etc. of the anti-corrosion layer material, generating gases and impurities. These gases and impurities will mix into the weld, forming welding defects such as pores and inclusions, seriously affecting the quality and strength of the weld and reducing the mechanical properties of the welded joint; 2. In order to prevent media such as oil and gas from leaking at the pipe connection during transportation, it is necessary to weld to form a continuous, dense, and defect-free weld. If the anti-corrosion layer is not removed cleanly, it will hinder the tight fit between the weld and the steel pipe matrix, resulting in gaps or weak links between the weld and the matrix; 3. When welding directly without removing the anti-corrosion layer, the heat generated during the welding process will cause uneven heating of the anti-corrosion layer edge, resulting in a decrease in the bonding force between the anti-corrosion layer edge and the matrix metal, and situations such as warping or peeling will occur, etc.

[0004] In order to reserve sufficient uncoated areas at the pipe ends, a technical solution of pasting masking materials such as kraft paper at the pipe ends for production has been proposed, effectively avoiding the technical problem of the pipe ends being coated with epoxy powder coatings. However, the solution of pasting masking materials such as kraft paper has problems such as complex production processes (adding processes of pasting kraft paper and subsequent removal of kraft paper, increasing labor costs), serious coating waste (the epoxy powder fuses on the kraft paper, and this part of the epoxy powder cannot be reused, causing coating waste), and a large amount of waste generation (after removing the kraft paper, the kraft paper and the epoxy powder solidified on it can only be discarded, generating a large amount of waste and polluting the environment), which prompts people to improve the existing technology. Currently, for the production of FBE anti-corrosion pipes, we have developed a pipe end connector and a system including it and applied for a Chinese invention patent (application number: CN202410749640.6), effectively solving the problem of the pipe ends of ordinary epoxy powder (FBE) anti-corrosion steel pipes being coated with anti-corrosion coatings through this pipe end connector. However, for 3PE anti-corrosion steel pipes, the above pipe end connector is not applicable. The main reasons are as follows: 1. During the production process of 3PE anti-corrosion steel pipes, the epoxy powder layer, copolymer adhesive layer, and polyethylene layer need to be continuously completed on the same production line. If the above pipe end connector is used, since the two pipes allowed to be connected during its use can rotate and there can be a certain expansion and contraction in the axial direction, this will seriously affect the winding and bonding quality of the copolymer adhesive layer and the polyethylene layer. For example, it may lead to problems such as uneven anti-corrosion layer thickness, decreased interlayer bonding force, and unqualified bonding strength between layers (especially near the pipe ends), ultimately affecting the product quality; 2. The above pipe end connector requires a certain slope at the pipe ends of the connected pipes during use. For pipes without slopes, there will be a large difference between the outer diameter of the pipe end connector and the outer diameter of the connected pipes, which will further affect the winding and bonding quality of the copolymer adhesive layer and the polyethylene layer. In view of the existence of the above problems, currently for 3PE anti-corrosion steel pipes, only the solution of pasting masking materials such as kraft paper at the pipe ends can still be adopted.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the present invention proposes a shielding system and its application, aiming to overcome at least one of the above defects.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: A shielding system, which includes a pipe unit located on a production line, a powder spraying chamber frame, a first mounting plate, a lifting mechanism and a shielding mechanism. Among them, the pipe unit passes through the powder spraying chamber frame, and a powder spraying chamber is formed inside the powder spraying chamber frame. The first mounting plate is connected to the lifting mechanism and can be lifted and lowered in the vertical direction under the drive of the lifting mechanism. A shielding mechanism is provided on the first mounting plate. The shielding mechanism can shield a predetermined area of the pipe unit and move synchronously along the axial direction of the pipe unit while shielding to pass through the powder spraying chamber, thereby preventing the powder from the powder spraying chamber from being sprayed onto the predetermined area.

[0008] Preferably, the powder spraying chamber frame includes a left frame and a right frame. There is a gap between the left frame and the right frame. At the gap position, the left frame and the right frame are connected by a transition part. The production channel passes through the left frame, the right frame and the transition part. A first cavity and a second cavity are respectively formed inside the left frame and the right frame, and a powder spraying cavity is formed inside the transition part. The first cavity, the powder spraying cavity and the second cavity together constitute the powder spraying chamber. Nozzles for spraying epoxy powder are arranged in the powder spraying cavity.

[0009] Preferably, the shielding mechanism includes a second mounting plate, a shielding component and a synchronous rolling mechanism. The second mounting plate is slidably arranged below the first mounting plate. Both the shielding component and the synchronous rolling mechanism are fixedly arranged below the second mounting plate. The synchronous rolling mechanism includes a third power unit, an arm unit and a roller. Among them, the rotation axis of the roller is parallel to the axis of the pipe unit. The output end of the third power unit is connected to one end of the arm unit, and the other end of the arm unit is connected to the roller. The third power unit can drive the arm unit to act so that the roller presses against the surface of the pipe unit.

[0010] Further preferably, the synchronous rolling mechanism further includes a support plate unit, a first hinge unit and a second hinge unit. The support plate unit is in an "ㄇ" shape structure, which includes a cross plate at the top and side plates on both sides of the cross plate. The synchronous rolling mechanism is fixedly connected to the second mounting plate through the cross plate. The third power unit and the arm unit are both rotatably arranged between the two side plates. The output end of the third power unit is hinged to one end of the arm unit through the second hinge unit. The middle of the arm unit is hinged to the two side plates through the first hinge unit. The roller is arranged at the end of the arm unit far from the second hinge unit.

[0011] Further preferably, the bottom of the first mounting plate is further provided with an initial position and a terminal position for restricting the movement of the shielding mechanism. A first sensor and a second sensor are respectively arranged at the initial position and the terminal position. The fourth power unit acts according to the signals of the first sensor and the second sensor. When the first sensor detects that the shielding mechanism reaches the initial position, the fourth power unit stops acting. When the second sensor detects that the shielding mechanism reaches the terminal position, the fourth power unit is started to work, so that the shielding mechanism moves towards the initial position and returns to the initial position. A third sensor is also arranged at the initial position. The third sensor is used for identifying the connector. The third power unit can act according to the signals of the second sensor and the third sensor. When the third sensor detects and identifies the connector, the third power unit is started, so that the rollers of the synchronous rolling mechanism are pressed against the surface of the pipe unit, thereby realizing the synchronous movement of the shielding mechanism along the axial direction of the pipe unit following the pipe unit. When the second sensor detects that the shielding mechanism reaches the terminal position, the third power unit stops working, and the rollers of the synchronous rolling mechanism are separated from the surface of the pipe unit.

[0012] It should be understood that the shielding system of the present invention is preferably applied to the production of 3PE anti-corrosion pipes.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention provides a shielding system, which is particularly applicable to the production of 3PE anti-corrosion pipes. By forming a shielding area outside the pipe unit, the cumbersome processes of traditional shielding materials such as pasting kraft paper and tapes are omitted, the production process is simplified, and the production efficiency is effectively improved. The shielding mechanism of the present invention is pressed against the pipe unit by the rollers of its synchronous rolling mechanism, and the shielding mechanism is driven to move synchronously with the pipe unit through the movement of the pipe unit itself, without complex manual intervention, making the entire production process smoother and more coherent, easy to automate control and integrate, and providing strong support for large-scale industrial production. Compared with the prior art, the shielding system of the present invention reduces the usage amount of coatings, reduces the raw material cost, and at the same time, reduces the generation of waste and the waste treatment cost, and is more friendly to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the drawings: Figure 1 is a three-dimensional structural schematic diagram of the shielding system of the present invention (part of the structure is not shown); Figure 2 is a structural schematic diagram of the connection between pipes on the production line; Figure 3 is Figure 1Schematic front view structure diagram of the shown shielding system; Figure 4 is Figure 1 Schematic side view structure diagram of the shown shielding system; Figure 5 is Figure 4 Partial enlarged view of area A in [the figure]; Figure 6 Schematic partial three-dimensional structure diagram of the synchronous rolling mechanism used in the present invention (part of the support plate removed); Figure 7 Schematic three-dimensional structure diagram of the shielding system of the present invention after removing structures such as the powder spraying chamber frame; Figure 8 is Figure 7 Schematic bottom view structure diagram of the shown shielding system; Figure 9 is Figure 8 Partial enlarged view of area B in [the figure]; Among them, the meanings of the respective reference numerals are as follows: 1 - Powder spraying chamber frame, 2 - First mounting plate, 3 - Lifting mechanism, 4 - Shielding mechanism, 5 - Lifting rod, 6 - First power unit, 7 - Second mounting plate, 8 - Synchronous rolling mechanism, 9 - Baffle, 10 - Rack, 11 - First slide rail unit, 12 - Second slide rail unit, 13 - Second power unit, 14 - Third power unit, 15 - Gear, 16 - Fourth power unit, 17 - Support plate unit, 18 - First hinge unit, 19 - Arm unit, 20 - Roller, 21 - Second hinge unit, 22 - First beam, 23 - Second beam, 24 - Suspension mechanism, 25 - Support rod, 26 - Guide block, 27 - Lifting column, 28 - Auxiliary unit, 100 - First pipe, 101 - Observation window, 102 - Production channel, 103 - Transition part, 104 - Interval, 200 - Second pipe, 300 - Connector, 400 - Shielding area. Detailed implementation manners

[0015] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention.

[0016] Specifically, as Figures 1 to 9 shown, the present invention provides a shielding system, which includes a pipe unit located on the production line, a powder spraying chamber frame 1, a first mounting plate 2, a lifting mechanism 3 and a shielding mechanism 4. Among them, the pipe unit passes through the powder spraying chamber frame 1, a powder spraying chamber is formed inside the powder spraying chamber frame 1, the first mounting plate 2 is connected to the lifting mechanism 3 and can move along the vertical direction under the drive of the lifting mechanism 3 ( Figure 1lift in the oz direction. A shielding mechanism 4 is provided on the first mounting plate 2. The shielding mechanism 4 can shield a predetermined area of the pipe unit and, while shielding, move synchronously along the axial direction of the pipe unit ( Figure 1 in the ox direction) through the powder spraying chamber, thereby preventing the powder from the powder spraying chamber from being sprayed onto the predetermined area.

[0017] It should be noted that in the prior art, in the process of using epoxy powder spraying to produce anti-corrosion pipes, in order to avoid epoxy powder being sprayed onto the predetermined area, the common practice is to stick masking materials such as kraft paper and tape on the predetermined area. This practice not only has the problem of complex production process, but also causes serious waste of paint and generates a large amount of waste. In the present invention, the shielding mechanism 4 shields the predetermined area of the pipe unit. While shielding, the shielding mechanism 4 can move synchronously along the axial direction of the pipe unit through the powder spraying chamber. In this way, during the process of passing through the powder spraying chamber, the shielding mechanism 4 always shields at the position of the predetermined area of the pipe unit, thereby preventing the epoxy powder from the powder spraying chamber from being sprayed onto the predetermined area. Refer to Figure 2 , in the process of using epoxy powder spraying on the pipe unit to form an anti-corrosion pipe (such as a 3PE anti-corrosion pipe), the pipe unit needs to move axially along its own axis (such as Figure 2 the direction of the arrow shown by the moving speed v in the figure), and at the same time, the pipe unit also needs to rotate around its own axis (such as Figure 2 the direction of the arrow shown by the rotational speed w in the figure). The shielding mechanism 4 of the present invention only needs to ensure synchronous movement along the axial direction of the pipe unit, so as to form a stable shielding area 400 outside the predetermined area of the pipe unit.

[0018] In a preferred embodiment, the pipe unit includes a first pipe 100 and a second pipe 200 connected to each other. The first pipe 100 and the second pipe 200 are connected by a connector 300. The shielding mechanism 4 can shield the connector 300 and at least part of the first pipe 100 and at least part of the second pipe 200 on both sides thereof. In this way, the shielding system of the present invention can shield the ends of the anti-corrosion pipes on the production line, thereby ensuring that there is enough non-coated area reserved at the pipe ends during the production process of the anti-corrosion pipes.

[0019] Preferably, the connector 300 connects the first pipe 100 and the second pipe 200 in a plug-in manner. Moreover, when the first pipe 100 and the second pipe 200 are connected by the connector 300, there is almost no relative rotation between the first pipe 100 and the second pipe 200. It should be noted that the shielding system of the present invention can be applied not only to the production of FBE anti-corrosion pipes but also to the production of 3PE anti-corrosion pipes. When it is applied to the production of FBE anti-corrosion pipes, since only the spraying of epoxy powder is required, therefore, only by connecting the first pipe 100 and the second pipe 200 through the connector 300 to ensure their synchronous movement in the axial direction ( Figure 1 in the ox direction), there is no need to make excessive requirements on whether the first pipe 100 and the second pipe 200 can rotate; while when it is applied to the production of 3PE anti-corrosion steel pipes, since after the spraying of epoxy powder is completed, the next step is the bonding and winding of the copolymer adhesive layer and the polyethylene layer. In order to ensure the bonding and winding quality, it is necessary that there is almost no relative rotation between the first pipe 100 and the second pipe 200. It should also be understood that "almost no relative rotation" here does not mean absolute non-rotation. Even if there is a slight rotation, as long as it does not affect the bonding and winding quality, it should be understood to be within the protection scope of the present invention.

[0020] In a preferred embodiment, a production channel 102 is formed on the powder spraying chamber frame 1. At least part of the first mounting plate 2 is located within the production channel 102 and can move up and down within the production channel 102. The shielding mechanism 4 is disposed below the first mounting plate 2 and can move from the upstream side of the powder spraying chamber frame 1 to the downstream side of the powder spraying chamber frame 1 through the production channel 102 during the synchronous movement; the pipe unit is located within the production channel 102, and the production channel 102 is communicated with the powder spraying chamber. In this way, it is ensured that the shielding mechanism 4 passes through the powder spraying chamber while realizing the synchronous movement.

[0021] Further preferably, an observation window 101 is further provided on at least one side surface of the powder spraying chamber frame 1. A transparent material layer is provided at the observation window 101, so that the situation inside the powder spraying chamber and the production channel 102 can be viewed through the observation window 101, which is convenient for the operator to master the powder spraying situation. Referring to the figure, the extending direction of the observation window 101 is, for example, along the direction perpendicular to the pipe unit, such as the oy direction.

[0022] In a preferred embodiment (see Figure 3), the first mounting plate 2 extends at least partially to the outside of the powder spraying chamber housing 1 along the upstream side and the downstream side of the powder spraying chamber housing 1. It should be noted that when the shielding mechanism 4 forms a shield and performs the synchronous movement, its movement path needs to be transferred from the upstream side of the powder spraying chamber housing 1 to the downstream side. To ensure that the shielding mechanism 4 has completed the formation of the shielding form before entering the powder spraying chamber housing 1, it is necessary for the first mounting plate 2 to extend a certain distance upstream (such as Figure 3 shown), so as to provide the necessary pre-action space for the shielding mechanism 4 arranged below it. This extended design enables the shielding mechanism 4 to complete the initialization of the shielding action before entering the production channel 102. Similarly, to ensure that the shielding mechanism 4 completely passes through the production channel 102, the first mounting plate 2 also extends a certain distance downstream to ensure that when the shielding ends, the shielding mechanism 4 has moved to a predetermined position on the downstream side of the powder spraying chamber housing 1. Preferably, the distance that the first mounting plate 2 extends downstream is equal to the distance that it extends upstream.

[0023] To better achieve the object of the present invention, the powder spraying chamber housing 1 includes a left housing and a right housing, there is a gap 104 between the left housing and the right housing, at the position of the gap 104, the left housing and the right housing are connected by a transition part 103, the production channel 102 penetrates through the left housing, the right housing and the transition part 103, a first cavity and a second cavity are respectively formed in the left housing and the right housing, a powder spraying cavity (the powder spraying cavity also belongs to a part of the production channel 102) is formed in the transition part 103, the first cavity, the powder spraying cavity and the second cavity together constitute the powder spraying chamber in the powder spraying chamber housing 1, and the nozzle for spraying epoxy powder is arranged in the powder spraying cavity. During the production process of FBE anti-corrosion pipes and 3PE anti-corrosion pipes, before the powder spraying operation, the pipe unit has been heated to a predetermined temperature by means such as intermediate frequency heating, and the epoxy powder will only fuse when it is sprayed onto the surface of the pipe unit. In other cases, the epoxy powder will remain in its powder state. During the powder spraying process, a lot of epoxy powder cannot be sprayed onto the surface of the pipe unit. In this way, the epoxy powder that is not sprayed onto the surface of the pipe unit can be recovered through the first cavity and the second cavity on both sides of the powder spraying cavity, which also avoids the problem of waste of raw materials caused by the epoxy powder escaping outside the powder spraying chamber housing 1, thus saving costs.

[0024] In a preferred embodiment, the lifting mechanism 3 includes a lifting rod 5 and a first power unit 6. The lower end of the lifting rod 5 is fixedly connected to the top surface of the first mounting plate 2. The lifting rod 5 can move in the vertical direction under the action of the first power unit 6, thereby realizing the lifting of the first mounting plate 2 in the vertical direction. This lifting method is very common in the prior art and will not be elaborated here.

[0025] In a further preferred embodiment, see Figure 3 and Figure 7, two support rods 25 are respectively arranged inside the left frame body and the right frame body. The two support rods 25 inside the same frame body are fixedly connected at the top by a second beam 23. The support rods 25 between the left frame body and the right frame body are fixedly connected at the top by a first beam 22. A suspension mechanism 24 is fixedly arranged on the second beam 23. The lifting rod 5 is suspended on the suspension mechanism 24 in a liftable manner through the suspension mechanism 24. Guide blocks 26 are sleeved on each support rod 25, and the guide blocks 26 are fixedly connected to the first mounting plate 2. Through such a setting, it can be ensured that the lifting of the first mounting plate 2 in the vertical direction is more stable. In addition, the cooperation relationship between the suspension mechanism 24 and the lifting rod 5, etc., can be realized in forms such as a gear rack and a hydraulic telescopic rod. The lifting rod 5 can also not be just a single rod. For example, it can be a piston structure, the piston cylinder is fixedly connected to the suspension mechanism 24, and the piston rod is fixedly connected to the first mounting plate 2. The piston drives the first mounting plate 2 to lift and lower in the vertical direction. The above are all some specific implementation methods of the lifting mechanism 3, which are very common in the prior art and are not the key points of the present invention, so no detailed introduction will be given here.

[0026] In a preferred embodiment, the shielding mechanism 4 includes a second mounting plate 7, a shielding component and a synchronous rolling mechanism. Among them, a first sliding rail unit 11 is arranged at the bottom of the first mounting plate 2. The first sliding rail unit 11 extends along the upstream and downstream directions. The second mounting plate 7 is slidably arranged below the first mounting plate 2 through the first sliding rail unit 11. The shielding component and the synchronous rolling mechanism are both fixedly arranged below the second mounting plate 7. The shielding component includes a baffle 9. The shielding component uses the baffle 9 to form a shield for a predetermined area of the pipe unit. The synchronous rolling mechanism includes a third power unit 14, an arm unit 19 and a roller 20. Among them, the rotation axis of the roller 20 is parallel to the axis of the pipe unit. The output end of the third power unit 14 is connected to one end of the arm unit 19, and the other end of the arm unit 19 is connected to the roller 20. The third power unit 14 can drive the arm unit 19 to act so that the roller 20 is pressed against the surface of the pipe unit. Through such a setting, when the roller 20 is pressed against the surface of the pipe unit, since the pipe unit itself has both rotation and movement along its axis direction, therefore, the roller 20 receives the frictional force from the circumferential tangent direction of the pipe unit and the frictional force along the axis direction of the pipe unit. The frictional force in the circumferential tangent direction drives the roller 20 to rotate, and the frictional force along the axis direction of the pipe unit acts on the synchronous rolling mechanism, thereby driving the shielding mechanism 4 to slide along the first sliding rail unit 11, realizing the synchronous axial movement of the shielding mechanism 4 and the pipe unit, so that the baffle 9 can always effectively shield the predetermined area of the pipe unit.

[0027] Further preferably, referring to Figure 5 and Figure 6, the synchronous rolling mechanism also includes a support plate unit 17, a first hinge unit 18 and a second hinge unit 21. The support plate unit 17 is a "ㄇ"-shaped structure, which includes a horizontal plate at the top and side plates at both sides of the horizontal plate. The synchronous rolling mechanism is fixedly connected to the second mounting plate 7 through the horizontal plate. The third power unit 14 and the arm unit are rotatably arranged between the two side plates. The output end of the third power unit 14 is hinged to one end of the arm unit 19 through the second hinge unit 21. The middle part of the arm unit 19 is hinged to the two side plates through the first hinge unit 18. The roller 20 is arranged at the end of the arm unit 19 away from the second hinge unit 21. Preferably, the arm unit 19 is bent in a V-shape. Bending is a structural design, the purpose of which is to allow the roller 20 to be pressed against the upper surface of the pipe unit as much as possible when the third power unit 14 drives the arm unit 19 to move. For example Figure 5 As shown, this can ensure the stability of the roller 20 when rolling, thereby allowing the synchronous rolling mechanism to slide stably.

[0028] In a preferred embodiment, the shielding assembly further comprises a shielding body, a second slide rail unit 12 and a second power unit 13, wherein the second slide rail unit 12 is arranged at the bottom of the second mounting plate 7 and extends in a direction perpendicular to the pipe unit ( Figure 1 The top of the shielding body is slidably connected to the second slide rail unit 12, the second power unit 13 is used to drive the shielding body to slide along the second slide rail unit 12, and the bottom of the shielding body is connected to the baffle 9. Through such an arrangement, under the action of the second power unit 13, the baffle 9 can approach or move away from the pipe unit in the oy direction, which helps to adjust for pipes of different sizes and ensure that the baffle 9 blocks the surface near the predetermined area.

[0029] In order to better achieve the purpose of the present invention, the shielding assembly also includes a lifting column 27 and an auxiliary unit 28. The lifting column 27 is connected to the baffle 9 by transmission (for example, by screw transmission, cylinder drive, etc.), and the auxiliary unit 28 includes a power assembly (note, not the second power unit 13), which is used to drive the lifting column 27 to work and then drive the baffle 9 to rise and fall in the vertical direction. It should be understood that the lifting and lowering of the baffle 9 is controlled by two parts. One part is to drive the first mounting plate 2 up and down through the lifting mechanism 3, which is equivalent to coarse adjustment and lifting, and the other part is to drive the lifting column 27 to achieve lifting through the power assembly, which is equivalent to fine adjustment and lifting. The main purpose of this setting is to ensure that the baffle 9 can accurately block the predetermined area.

[0030] To better achieve the object of the present invention, the auxiliary unit 28 further includes a vacuum suction assembly. A plurality of suction ports are provided on one side of the baffle 9 facing the nozzle in the powder spraying cavity, and the suction ports are communicated with the vacuum suction assembly. When the shielding mechanism 4 moves along the production channel 102 and reaches the position of the nozzle in the powder spraying cavity, the distance between the nozzle and the baffle 9 is small, and the epoxy powder from the nozzle is likely to splash everywhere when hitting the baffle 9. Through the vacuum suction assembly, this part of the epoxy powder can be sucked away to avoid the problem of powder splashing.

[0031] To better achieve the object of the present invention, a rack 10 is further provided at the bottom of the first mounting plate 2. The rack 10 extends along the upstream and downstream directions. The shielding mechanism 4 further includes a gear 15 and a fourth power unit 16. The gear 15 meshes with the rack 10, and the fourth power unit 16 is used to drive the gear 15 to rotate. An overrunning clutch is further provided between the output end of the fourth power unit 16 and the gear 15 (a common overrunning clutch is like a bicycle flywheel, which can achieve self-clutching function according to the change of the rotation direction. The related principles and structures belong to the category of existing technologies and will not be described in detail here). When the shielding mechanism 4 moves from upstream to downstream along the first mounting plate 2, the overrunning clutch allows the gear 15 to be in a free rotation state, so that the shielding mechanism 4 slides downstream under the action of the frictional force along the axis direction of the pipe unit on the roller 20 without the fourth power unit 16 operating; when the shielding mechanism 4 needs to move from downstream to upstream, the fourth power unit 16 is started, and the gear 15 is driven to rotate through the overrunning clutch. The meshing of the gear 15 and the rack 10 enables the shielding mechanism 4 to achieve reverse sliding. This design can not only accurately control the position of the shielding mechanism 4, but also reduce power consumption, optimize the operation efficiency of the equipment, and make the movement of the shielding mechanism 4 more flexible. Preferably, the first slide rail unit 11 includes two parallel slide rails, and the rack 10 is located between the two slide rails.

[0032] In order to better achieve the object of the present invention, a bottom of the first mounting plate 2 is further provided with an initial position and a termination position for restricting the movement of the shielding mechanism 4 (for example, corresponding mechanical stoppers are provided on the first slide rail unit 11). Preferably, a first sensor and a second sensor are respectively provided at the initial position and the termination position, and the fourth power unit 16 operates according to signals of the first sensor and the second sensor (precisely, signals detected when the shielding mechanism 4 reaches the corresponding positions); when the first sensor detects that the shielding mechanism 4 reaches the initial position, the fourth power unit 16 stops operating; when the second sensor detects that the shielding mechanism 4 reaches the termination position, the fourth power unit 16 is started to operate, so that the shielding mechanism 4 moves towards the initial position and returns to the initial position. Further, a third sensor is also provided at the initial position, and the third sensor is used for identifying the connector 300. The third power unit 14 can operate according to signals of the second sensor and the third sensor; when the third sensor detects and identifies the connector 300, the third power unit 14 is started, so that the rollers 20 of the synchronous rolling mechanism are pressed against the surface of the pipe unit, thereby realizing synchronous movement of the shielding mechanism 4 along the axial direction of the pipe unit; when the second sensor detects that the shielding mechanism 4 reaches the termination position, the third power unit 14 stops operating, and the rollers 20 of the synchronous rolling mechanism are separated from the surface of the pipe unit.

[0033] In a preferred embodiment, in the upstream and downstream directions ( Figure 1 the direction of the ox coordinate axis shown), the rollers 20 are correspondingly within the coverage of the baffle 9. Specifically, when the baffle 9 shields at the position of the pipe unit to form a shielding area 400, the rollers 20 are correspondingly within the coverage of the shielding area 400. Since the pipe unit rotates, therefore, at Figure 2 the position of the shielding area 400 shown, the entire circumference of the pipe unit belongs to the coverage of the shielding area 400. Such a setting allows a certain deviation distance L ( Figure 3 for intuitive viewing, the deviation distance L is drawn too large and not within the coverage of the shielding area 400, which is different from the actual situation) to exist between the rollers 20 and the symmetry axis of the baffle 9 plate surface, but the deviation distance L should not be too large. Through such a setting, when the rollers 20 are pressed against the pipe unit, they are always in the non-coated area, and will not affect the epoxy powder in the coated area, thereby affecting the quality of the anti-corrosion pipe.

[0034] It should also be noted that although the shielding system of the present invention can be applied to the production of FBE anti-corrosion pipes, 3PE anti-corrosion pipes, etc., in actual production, it is rarely applied to FBE anti-corrosion pipes. This is because, compared with the pipe end connector of our prior invention (application number: CN202410749640.6), the energy consumption of this shielding system is higher, so there is no need to use it for the production of FBE anti-corrosion pipes. However, it should be understood that applying it to the production of FBE anti-corrosion pipes should also fall within the protection scope of the present invention.

[0035] For 3PE anti-corrosion pipes, the above-mentioned pipe end connector is not applicable. In the prior art, during the production process of 3PE anti-corrosion pipes, the method of using masking materials such as kraft paper and tape is still mainly adopted. Not only is the production process complex, but also the coating waste is serious, and a large amount of waste is easily generated. When the shielding system of the present invention is applied to the production of 3PE anti-corrosion pipes, on the one hand, it is no longer necessary to stick kraft paper, etc. to form a non-coated area. On the other hand, the subsequent copolymer adhesive layer bonding and polyethylene layer winding will not be affected in any adverse way. In addition, after the production is completed, the copolymer adhesive layer and polyethylene layer here can be cut off by a cutting device to obtain a finished 3PE anti-corrosion pipe with a non-coated area. Since there is no epoxy powder on the cut copolymer adhesive layer and polyethylene layer (if kraft paper is used, a large amount of epoxy powder will be sintered on the kraft paper and then combined with the copolymer adhesive layer), it can also be recycled (the existing scheme of sticking kraft paper cannot be recycled because the epoxy powder sintered on the surface of the kraft paper has polluted the copolymer adhesive layer). Therefore, applying the shielding system of the present invention to the production of 3PE anti-corrosion pipes will have great advantages.

[0036] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, 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 occlusion system, comprising a pipe unit, a powder spraying chamber frame (1), a first mounting plate (2) and an occlusion mechanism (4), characterized in that, The pipe unit passes through the powder spraying chamber housing (1), a powder spraying chamber is formed inside the powder spraying chamber housing (1), a shielding mechanism (4) is arranged on the first mounting plate (2), and the shielding mechanism (4) can form a shield for a predetermined area of the pipe unit, and while shielding, it moves synchronously along the axial direction of the pipe unit to pass through the powder spraying chamber, thereby preventing the powder from the powder spraying chamber from being sprayed onto the predetermined area.

2. The occluding system according to claim 1, wherein The pipe unit includes a first pipe (100) and a second pipe (200) connected to each other, the first pipe (100) and the second pipe (200) are connected by a connector (300), and the shielding mechanism (4) can shield the connector (300) and at least part of the first pipe (100) and at least part of the second pipe (200) on both sides thereof.

3. The occlusion system according to claim 2, wherein, When the first pipe (100) and the second pipe (200) are connected through the connector (300), there is no relative rotation between them.

4. A shielding system according to claim 1, wherein A production channel (102) is formed on the powder spraying chamber housing (1), at least part of the first mounting plate (2) is located inside the production channel (102) and can move up and down inside the production channel (102), the shielding mechanism (4) is arranged below the first mounting plate (2) and can move from the upstream side of the powder spraying chamber housing (1) to the downstream side of the powder spraying chamber housing (1) through the production channel (102) during the synchronous movement; the pipe unit is located inside the production channel (102).

5. An occlusion system according to claim 4, wherein, The powder spraying chamber housing (1) includes a left housing and a right housing, the left housing and the right housing are connected by a transition part (103), the production channel (102) runs through the left housing, the right housing and the transition part (103), a first cavity and a second cavity are respectively formed inside the left housing and the right housing, a powder spraying cavity is formed inside the transition part (103), the first cavity, the powder spraying cavity and the second cavity together constitute the powder spraying chamber, and nozzles for spraying epoxy powder are arranged inside the powder spraying cavity.

6. A shielding system according to claim 1, wherein The shielding mechanism (4) includes a second mounting plate (7), a shielding component and a synchronous rolling mechanism, the second mounting plate (7) is slidably arranged below the first mounting plate (2), both the shielding component and the synchronous rolling mechanism are arranged below the second mounting plate (7), the synchronous rolling mechanism includes a third power unit (14), an arm unit (19) and a roller (20), wherein, the rotation axis of the roller (20) is parallel to the axis of the pipe unit, the output end of the third power unit (14) is connected to one end of the arm unit (19), the other end of the arm unit (19) is connected to the roller (20), and the third power unit (14) can drive the arm unit (19) to act so that the roller (20) presses against the surface of the pipe unit.

7. The occlusion system according to claim 6, characterized in that, When the roller (20) presses against the surface of the pipe unit, the roller (20) receives the frictional force from the circumferential tangent direction of the pipe unit and the frictional force along the axial direction of the pipe unit, the frictional force in the circumferential tangent direction drives the roller (20) to rotate, and the frictional force along the axial direction of the pipe unit acts on the synchronous rolling mechanism, thereby realizing the synchronous axial movement of the shielding mechanism (4) and the pipe unit.

8. A shielding system according to claim 7, wherein, A rack (10) is further provided at the bottom of the first mounting plate (2). The shielding mechanism (4) further includes a gear (15) and a fourth power unit (16). The gear (15) meshes with the rack (10). The fourth power unit (16) is used to drive the gear (15) to rotate. An overrunning clutch is further provided between the output end of the fourth power unit (16) and the gear (15). When the shielding mechanism (4) moves from the upstream side to the downstream side of the powder spraying chamber housing (1), the overrunning clutch makes the gear (15) in a free rotation state without the fourth power unit (16) operating; when the shielding mechanism (4) needs to move from the downstream side to the upstream side, the fourth power unit (16) is started, and the gear (15) is driven to rotate through the overrunning clutch. The shielding mechanism (4) realizes reverse sliding through the meshing of the gear (15) and the rack (10).

9. A shielding system according to claim 7, characterized in that, The bottom of the first mounting plate (2) is further provided with an initial position and a termination position for restricting the movement of the shielding mechanism (4). A first sensor and a second sensor are respectively provided at the initial position and the termination position. The fourth power unit (16) operates according to the signals of the first sensor and the second sensor; when the first sensor detects that the shielding mechanism (4) reaches the initial position, the fourth power unit (16) stops operating. When the second sensor detects that the shielding mechanism (4) reaches the termination position, the fourth power unit (16) is started to work, so that the shielding mechanism (4) moves towards the initial position and returns to the initial position.

10. Application of a shielding system according to any one of claims 1-9 in the production of 3PE anti-corrosion steel pipes.

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