Automatic spiral welding device and method for glass steel composite pipe inner lining pipe stop plastic belt

Abstract

The application discloses a kind of automatic spiral welding device and method of glass steel composite pipe lining pipe stop plastic belt, by setting support frame, general control, pipe rack and the welding station capable of bidirectional sliding, based on stop belt manual welding process, combine mechanical design, circuit design, PLC programming control, reach the integration of composite pipe inner and outer layer, while fundamentally solve the problems such as large human factor influence, poor quality, low welding efficiency of pipe enterprise stop belt manual welding, realize high-speed automatic welding.

Description

Technical Field

[0001] This invention relates to the field of integrated manufacturing of inner and outer layers of fiberglass composite pipes, specifically to an automatic spiral welding device and method for the stop plastic strip of the inner lining of a fiberglass composite pipe. Background Technology

[0002] Plastic alloy fiberglass composite pipe (hereinafter referred to as: composite pipe) is a double-layer structure non-metallic pipe, mostly used in oilfield crude oil transportation and sewage reinjection. The outer layer of the composite pipe is a reinforcing layer, which mainly bears the pressure of the internal transported medium, resists the external burial pressure, and resists external environmental corrosion. It is mostly made of high-rigidity, high-pressure-resistant thermosetting resin and fiberglass yarn. The inner layer (lining pipe) of the composite pipe is a functional layer, which is in direct contact with the transported medium. It must have high toughness and corrosion resistance, and is mostly made of thermoplastic resin.

[0003] Currently, the construction of pipeline projects in various oilfields is usually scheduled for late autumn and early winter, when the ambient temperature is low (the lowest point is below 0℃). Some thermoplastics, such as polyvinyl chloride and chlorinated polyvinyl chloride, are polar polymers that become brittle at low temperatures and are not suitable for making inner linings. Polyolefin thermoplastics, such as polyethylene and polypropylene, are corrosion-resistant, have high toughness, and have good resistance to low-temperature impact, and are often chosen by pipeline companies as the main materials for making inner linings.

[0004] During the operation of composite pipe networks, in order to uniformly transmit the pressure of the internal transported medium to the reinforcing layer and achieve pressure balance, it is necessary to integrate the reinforcing layer and the inner lining pipe. Polyethylene, polypropylene, and other resins are non-polar polymer materials and cannot achieve integration through bonding. Therefore, how to achieve integration of the inner and outer layers of composite pipes is a problem that pipeline companies urgently need to solve.

[0005] Currently, pipeline companies mostly achieve the purpose of limiting and stopping movement by spirally welding stop plastic strips (hereinafter referred to as: stop strips) onto the inner lining pipe to form a tenon and mortise structure between the layers. However, the welding process of the stop strips is mostly done manually, which leads to the following problems:

[0006] 1. Welding quality is greatly affected by human factors, resulting in poor quality, large fluctuations, and frequent weld failure;

[0007] 2. Low welding efficiency. Summary of the Invention

[0008] The purpose of this invention is to provide an automatic spiral welding device and method for the stop plastic strip of the inner lining of a fiberglass composite pipe, so as to overcome the problems of large human factor influence, poor quality and low welding efficiency of manual welding of stop strips in pipeline enterprises. This invention can automatically spiral weld the stop plastic strip to achieve the integration of the inner and outer layers of the composite pipe, and the welding efficiency is high and the quality is good.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An automatic spiral welding device for the stop plastic strip of a fiberglass composite pipe inner lining includes a support frame, a main control unit, and a pipe rack, wherein the pipe rack is connected to one side of the support frame.

[0011] The support frame is provided with several guide rails; several sliding plates are provided on the guide rails and connected to them; the sliding plates are provided with welding stations and unwinding reel supports; the unwinding reel supports are fixed with unwinding reels for winding up the stop plastic strip.

[0012] The welding station is equipped with a stepper drive system for conveying the stop plastic strip, a guide tube for guiding the stop plastic strip, and a hot melt device for melting the stop plastic strip.

[0013] A horizontal servo motor is provided under the sliding plate to drive the welding station to slide laterally along the guide rail.

[0014] The sliding plate is also equipped with an axial servo motor for driving the welding station to slide along the axis of the sliding plate.

[0015] The pipe rack has several pairs of symmetrically arranged rubber rollers evenly distributed on it. A speed-regulating motor is installed at the bottom of the pipe rack. The speed-regulating motor is connected to one of the pairs of rubber rollers on the pipe rack via a chain.

[0016] The main control unit is connected to the stepper drive system, the hot melt device, the axial servo motor, the transverse servo motor, and the speed regulating motor.

[0017] Furthermore, the welding station includes a back plate that can slide laterally along the sliding plate, and the stepping transmission system, guide tube and hot melt device are all disposed on the back plate.

[0018] Furthermore, the welding station includes a base plate that can slide laterally along the sliding plate and a back plate connected to the base plate, and the stepping transmission system, guide tube and hot melt device are all disposed on the back plate.

[0019] Furthermore, a guide rail clamp is connected below the sliding plate, and the guide rail clamp is connected to the guide rail.

[0020] Furthermore, a cylinder bracket is provided on the support frame, and a vertically downward cylinder is fixed on the cylinder bracket. A rubber wheel is provided at the end of the cylinder, and the main control is connected to the cylinder.

[0021] Furthermore, during welding, the rubber roller at the end of the cylinder is used in conjunction with any pair of rubber rollers on the pipe rack to clamp the inner liner pipe to be welded.

[0022] Furthermore, the hot melt device includes a blower and a temperature control unit, both of which are connected to the main control unit. The blower and the temperature control unit are sequentially arranged on the welding station. The temperature control unit includes a heating resistor and a temperature sensor.

[0023] An automatic spiral welding method for the stop plastic strip of the inner lining of a fiberglass composite pipe includes the following steps:

[0024] Step 1: Pass the stop plastic strip radially through the stepper drive system and the guide tube in sequence;

[0025] Step 2: Start the hot melt device via the main control and adjust the temperature to melt the stop plastic strip;

[0026] Step 3: Place the inner lining tube to be welded on the rubber roller of the pipe rack, start the speed-regulating motor through the main control, and use the chain to drive the rubber roller to move at a constant speed at the preset rotational linear speed.

[0027] Step 4: Using the central control unit to push the axial servo motor, the welding station is pushed axially towards the inner liner tube to be welded.

[0028] Step 5: Simultaneously control the horizontal servo motor and the stepper drive system through the main control. The horizontal servo motor pulls the welding station to move horizontally at a uniform speed, and the stepper drive system feeds the stop plastic strip at a preset transmission speed.

[0029] Step 6: Adjust the speed ratio of the horizontal servo motor, stepper transmission system, and speed-regulating motor through the central control, and adjust the temperature of the blower and hot melt device until the molten stop plastic strip adheres tightly to the inner lining tube, thus achieving welding.

[0030] Furthermore, the rotational linear velocity in step 3 is ≥20 mm / s; the transmission speed in step 5 is ≥20 mm / s.

[0031] Furthermore, the transmission speed described in step 5 is the same as the rotational linear speed described in step 3.

[0032] Compared with the prior art, the present invention has the following beneficial technical effects:

[0033] This invention provides an automatic spiral welding device for the stop plastic strip of the inner lining of a fiberglass composite pipe. By setting up a support frame, a main control unit, a pipe rack, and a welding station that can slide in both directions, based on the manual welding process of the stop strip, and combining mechanical design, circuit design, and PLC programming control, it achieves the integration of the inner and outer layers of the composite pipe, while fundamentally solving the problems of large human factors affecting the quality, poor quality, and low welding efficiency of manual welding of stop strips in pipeline enterprises, and realizing high-speed automated welding.

[0034] Furthermore, by setting up a cylinder and adjusting the height of the rubber roller at the end of the cylinder to match the speed-adjustable rubber roller on the pipe rack, the inner liner is firmly tightened, greatly improving the stability of the welding process.

[0035] Furthermore, the hot-melting device of the present invention adopts a combination of heating resistor, temperature sensor and blower, which can accurately control the hot-melting temperature and wind speed, and improve the hot-melting effect.

[0036] The present invention also provides an automatic spiral welding method for the stop plastic strip of the inner lining of a fiberglass composite pipe. By controlling the speed and temperature of the stepper drive system, the hot melt device, the axial servo motor, the transverse servo motor and the speed-regulating motor through the central control, high-speed automated welding is achieved, which greatly improves the welding quality and welding efficiency of the inner lining. Attached Figure Description

[0037] The accompanying drawings are provided to further understand the invention and constitute a part of this invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0038] Figure 1 This is a structural diagram of the welding station of the device of the present invention;

[0039] Figure 2 This is a schematic diagram of the pipe rack rotation section of the device of the present invention;

[0040] Figure 3 This is an overall structural diagram of the device of the present invention;

[0041] Figure 4 This is a schematic diagram of the stop welding of the device of the present invention.

[0042] Among them, 1-unwinding reel, 2-stopping plastic belt, 3-axial servo motor, 4-lateral servo motor, 5-guide rail clamp, 6-blower fan, 7-stepping transmission system, 8-guide tube, 9-temperature control unit, 10-cylinder, 11-speed regulating motor, 12-main control, 13-rubber roller, 14-guide rail, 15-pipe rack. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the implementation of the present invention is proposed to be divided into the following three stages:

[0044] ① Determination of welding process

[0045] Typically, to achieve seamless integration of the inner and outer layers of a composite pipe, the welding process for the stop strip needs to consider factors such as the size of the stop strip, the welding position, and the number of welding rings. Given a fixed length for a single pipe, all welding process parameters are constant. Taking a 9400mm long inner lining pipe as an example, see Table 1 for details:

[0046] Table 1: Welding Process of Inner Liner Tube Stop Plastic Strip

[0047]

[0048] ②Mechanical and circuit design

[0049] Based on the above welding process, this process, through mechanical and circuit design, and by linking electrical and pneumatic components, enables the mechanical automation to replace manual labor in completing the spiral welding action of the composite pipe inner lining.

[0050] The mechanical simulation of welding requires, firstly, the design of a welding station that can measure and cut the stop strip, convey the metering section at a constant speed, and melt the stop strip through electrothermal heating so that it can adhere to the inner lining pipe body; secondly, the design of a pipe rack that allows the inner lining pipe to make uniform relative movements in the circumferential, axial, and transverse directions, with the speed ratio between the circumferential and axial directions adjustable; and thirdly, the use of a programmable logic controller (PLC) to realize the overall control and linkage of the equipment.

[0051] ③ Material Procurement

[0052] Based on the mechanical and electrical design principles, at least the following components need to be purchased: programmable logic controller (PLC), industrial control screen, hydraulic servo motor, transmission belt, pneumatic shears, and steel.

[0053] ④ Machining

[0054] The main machining and fabrication items required for the automatic welding device include: the fabrication of the welding station and the fabrication of the three-way moving pipe rack.

[0055] ⑤ Program debugging and equipment linkage trial production

[0056] The primary task of program debugging is to convert welding process requirements into analog data signals, then program the PLC, and achieve automatic welding by controlling various electrical and pneumatic components.

[0057] ⑥ Trial production with integrated equipment

[0058] The main purpose of the equipment linkage trial production is to verify the efficiency and stability of the complete set of equipment operation.

[0059] ⑦ Product Testing

[0060] Product testing mainly verifies the degree to which welding process requirements are met, and is conducted in accordance with the standard -- Non-metallic composite pipes for the oil and gas industry, Part 7: Thermoplastic plastic lined fiberglass composite pipes (SY / T6662.7-2016).

[0061] If a product fails inspection, first analyze the reasons for the failure, then return to the "Mechanical and Circuit Design" step in the process flow. Guided by the analysis results, redesign the mechanical and circuit systems until the product passes inspection.

[0062] This device automates the welding of the stop plastic strip in the inner lining tube, solving the problems of poor quality and low welding efficiency caused by manual welding of stop strips in composite pipe manufacturing enterprises due to significant human factors. Its performance indicators meet the requirements of the following table:

[0063]

[0064]

[0065] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0066] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0067] like Figure 3 As shown, this invention provides an automatic spiral welding device for the stop plastic strip of a fiberglass composite pipe liner, including a support frame, a main control unit 12, and a pipe rack 15. The pipe rack 15 is disposed on one side of the support frame. Several guide rails 14 are axially arranged inside the support frame, and the guide rails 14 are metal guide rails. Several sliding plates are provided on the guide rails 14 and connected to them, such as… Figure 1 As shown, the sliding plate is provided with a welding station and a roll-up support. The roll-up support is fixed with a roll-up 1 for winding up the stop plastic strip 2. The welding station is also provided with a stepper transmission system 7 for conveying the stop plastic strip 2, a guide tube 8 for guiding the stop plastic strip 2, and a hot melt device for melting the stop plastic strip 2.

[0068] Welding stations can have two structures:

[0069] A welding station includes a back plate that can slide laterally with a sliding plate, wherein the stepping transmission system 7, the guide tube 8, and the hot melt device are all disposed on the back plate; in this case, the sliding plate is provided with a groove, and the back plate can slide along the groove.

[0070] Another type of welding station may include a base plate and a back plate that slide laterally with a sliding plate, wherein the stepping transmission system 7, the guide tube 8 and the hot melt device are all mounted on the back plate; in this case, a groove is provided on the sliding plate and a slider that mates with the groove is provided on the lower part of the base plate.

[0071] A horizontal servo motor 4 is provided under the sliding plate to drive the welding station to slide laterally along the guide rail 14.

[0072] The sliding plate is also equipped with an axial servo motor 3 for driving the welding station to slide along the axis of the sliding plate.

[0073] The pipe rack 15 has several pairs of symmetrically arranged rubber rollers 13 evenly distributed on it. A speed-regulating motor 11 is provided at the bottom of the pipe rack 15. The speed-regulating motor 11 is connected to one of the pairs of rubber rollers 13 on the pipe rack through a chain.

[0074] The main control unit 12 is connected to the stepper transmission system 7, the hot melt device, the axial servo motor 3, the transverse servo motor 4, and the speed regulating motor 11, respectively.

[0075] Preferably, a guide rail clip 5 is connected below the sliding plate, and the guide rail clip 5 can slide along the axial direction of the guide rail 14.

[0076] like Figure 2 As shown, the support frame is equipped with a cylinder bracket, the cylinder bracket is fixed with a vertically downward cylinder 10, the end of the cylinder 10 is equipped with a rubber wheel 13, and the main control 12 is connected to the cylinder 10.

[0077] During welding, the rubber roller 13 at the end of the cylinder 10 is used in conjunction with any pair of rubber rollers 13 on the pipe rack to clamp the inner liner pipe to be welded.

[0078] The hot-melting device includes a blower 6 and a temperature control unit 9, which are respectively connected to the main control unit 12. The blower 6 and the temperature control unit 9 are sequentially arranged on the back plate of the base. The temperature control unit 9 is a heating resistor and a temperature sensor.

[0079] This invention also provides an automatic spiral welding method for the stop plastic strip of the inner lining of a fiberglass composite pipe, the steps of which are as follows:

[0080] Step 1: Pass the stop plastic strip 2 radially through the stepper drive system 7, and then out through the guide tube 8. The stepper drive system 7 can ensure that the stop plastic strip 2 moves at a uniform speed and smoothly, and the guide tube can guide the movement direction of the stop plastic strip 2.

[0081] Step 2: Start the hot melt device through the main control 12 and adjust the temperature to melt the stop plastic strip 2;

[0082] Step 3: Place the inner lining tube to be welded onto the tube rack 15, start the speed regulating motor 11 through the main control 12, and use the chain to drive the rubber wheel 13 to move at a constant speed of ≥20mm / s.

[0083] Step 4: Control the axial servo motor 3 through the main control 12 to push the welding station axially close to the inner liner tube to be welded until the molten stop plastic strip 2 is pressed against the tube body and then the action stops.

[0084] Step 5: Simultaneously control the horizontal servo motor 4 and the stepper transmission system 7 through the main control 12. The horizontal servo motor 4 pulls the welding station to move horizontally at a uniform speed, and the stepper transmission system 7 feeds the stop plastic belt 2 at the same transmission speed as the rotational linear speed in step 3.

[0085] Step 6: By adjusting the speed ratios of the horizontal servo motor 4, the stepper transmission system 7, and the speed-regulating motor 11, automated welding at a speed of ≥20mm / s is ultimately achieved; the melting degree of the stop plastic strip 2 is controlled by adjusting the blower 6 and the hot melt device until the molten stop plastic strip 2 adheres tightly to the inner lining tube, ultimately achieving a shear strength of ≥0.5×10⁻⁶. 6 N / m 2 Welding.

[0086] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0087] Example 1

[0088] (1) Use the unwinding reel 1 to wind up the stop plastic strip 2 for later use; start the device, first pass the stop plastic strip 2 radially through the conveyor belt of the stepping drive system 7, and then pass it out through the guide tube 8, which is made of copper.

[0089] (2) Start the blower 6, heating resistor and temperature sensor through the main control 12 (the main control includes a programming logic controller, human-machine interface, contactor and circuit breaker), and control the temperature of the blower to the optimal temperature for melting the stop plastic strip (generally 240℃, depending on the welding speed, adjustable), so that the stop plastic strip 2 melts.

[0090] (3) Place the inner lining tube to be welded on the pipe rack 15, and control the cylinder 10 to press down through the main control 12, so that the inner lining tube is clamped between the rubber wheel 13 of the cylinder 10 and the rubber wheel 13 on the pipe rack 15. At the same time, start the speed regulating motor 11 through the main control 12, and use the chain to drive the rubber wheel 13 to move at a constant speed. The rotational linear speed is controlled to be ≥20mm / s.

[0091] (4) Control the axial servo motor 3 through the main control 12 to push the welding station axially close to the inner liner tube to be welded until the molten stop plastic strip 2 is pressed against the tube body and then the action stops.

[0092] (5) The horizontal servo motor 4 and the stepper transmission system 7 are controlled simultaneously by the main control 12. The horizontal servo motor 4 pulls the welding station to move horizontally at a uniform speed. The stepper transmission system 7 feeds the stop plastic belt 2 at a speed of ≥20mm / s. It is best to keep the transmission speed the same as the linear rotation speed in step 3.

[0093] (6) By controlling the speed of the horizontal servo motor 4, the stepper transmission system 7, and the speed-regulating motor 11, high-speed (≥20mm / s) automated welding is finally achieved; by adjusting the temperature of the blower 6, heating resistor, and temperature sensor, the welding stops when the molten stop plastic strip 2 adheres tightly to the inner lining tube, ultimately achieving high-quality welding (shear strength ≥0.5×10⁻⁶). 6 N / m 2 )welding.

[0094] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit the invention, nor are they intended to limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. That is to say, any changes or refinements made to the main design concept and spirit of the present invention that are not of substantial significance, but whose technical problems are still consistent with the present invention, should be included within the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields are similarly included within the patent protection scope of the present invention.

Claims

1. An automatic spiral welding device for the stop plastic strip of a fiberglass composite pipe liner, characterized in that, It includes a support frame, a main control (12), and a pipe rack (15), the pipe rack (15) being connected to one side of the support frame; The support frame is provided with several guide rails (14); the guide rails (14) are provided with several sliding plates that cooperate with them, the sliding plates are provided with welding stations and unwinding tray supports, and the unwinding tray supports are fixed with unwinding trays (1) for winding and stopping plastic strips (2). The welding station is equipped with a stepper drive system (7) for conveying the stop plastic strip (2), a guide tube (8) for guiding the stop plastic strip (2), and a hot melt device for melting the stop plastic strip (2). The sliding plate is equipped with a horizontal servo motor (4) for driving the welding station to slide laterally along the guide rail (14). The sliding plate is also equipped with an axial servo motor (3) for driving the welding station to slide along the axial direction of the sliding plate. The tube frame (15) has several pairs of symmetrically arranged rubber rollers (13) evenly distributed on it. A speed-regulating motor (11) is provided at the bottom of the tube frame (15). The speed-regulating motor (11) is connected to one of the pairs of rubber rollers (13) on the tube frame via a chain. The main control (12) is connected to the stepper transmission system (7), the hot melt device, the axial servo motor (3), the transverse servo motor (4) and the speed regulating motor (11) respectively; The support frame is provided with a cylinder bracket, and the cylinder bracket is fixed with a vertically downward cylinder (10). The end of the cylinder (10) is provided with a rubber roller (13). The main control (12) is connected to the cylinder (10). During welding, the rubber roller (13) at the end of the cylinder (10) is used in conjunction with any pair of rubber rollers (13) on the pipe rack (15) to clamp the inner lining pipe to be welded. The welding station includes a base plate that can slide laterally along the sliding plate and a back plate connected to the base plate. The stepping transmission system (7), the guide tube (8) and the hot melt device are all set on the back plate. The sliding plate is connected to a guide rail clip (5), which is connected to the guide rail (14). The hot melt device includes a blower (6) and a temperature control unit (9), both of which are connected to the main control (12). The blower (6) and the temperature control unit are arranged sequentially on the welding station. The temperature control unit (9) includes a heating resistor and a temperature sensor. The welding requirements for the stop plastic strip (2) are as follows: 3 spiral welds are made at the pipe end 700mm from both ends of the inner liner pipe, and 3 spiral welds are made every 1000mm of the pipe body.

2. A method for automatically spiral welding a stop-locking plastic strip into the inner lining of a fiberglass composite pipe, characterized in that... The welding apparatus according to claim 1 includes the following steps: Step 1: Pass the stop plastic strip (2) radially through the stepper drive system (7) and the guide tube (8) in sequence; Step 2: Start the hot melt device through the main control (12) and adjust the temperature to melt the stop plastic strip (2); Step 3: Place the inner lining tube to be welded on the rubber wheel (13) of the tube rack (15), start the speed regulating motor (11) through the main control (12), and use the chain to drive the rubber wheel (13) to move at a constant speed at the preset rotational linear speed. Step 4: Control the axial servo motor (3) through the main control (12) to push the welding station axially close to the inner liner tube to be welded; Step 5: Control the horizontal servo motor (4) and the stepper transmission system (7) simultaneously through the main control (12). The horizontal servo motor (4) pulls the welding station to move horizontally at a uniform speed, and the stepper transmission system (7) feeds the stop plastic belt (2) at a preset transmission speed. Step 6: Adjust the speed ratio of the horizontal servo motor (4), stepper transmission system (7), and speed regulating motor (11) through the main control (12), and adjust the temperature of the blower (6) and hot melt device until the molten stop plastic strip (2) is tightly attached to the inner liner tube to achieve welding; The rotational linear velocity in step 3 is ≥20 mm / s; the transmission speed in step 5 is ≥20 mm / s; the transmission speed in step 5 is the same as the rotational linear velocity in step 3.

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