Waterproofing membrane lap edge hot air welding equipment and welding control method thereof

Abstract

The present application relates to a kind of waterproofing membrane lap edge hot air welding equipment and its welding control method, belong to waterproofing membrane construction equipment technical field, comprising: rack, hot air gun, servo drive wheel, post-welding pressure wheel and controller, temperature sensing element is equipped in post-welding pressure wheel to continuously measure the post-welding temperature of weld, marking spray head is located downstream of post-welding pressure wheel and is communicated with paint tank by electromagnetic valve, encoder is drivingly connected with servo drive wheel to detect the advancing position of rack;Controller is determined as welding defect when post-welding temperature is lower than preset temperature and electromagnetic valve is opened, so that marking spray head sprays marking paint at the weld, while reading the position data of encoder as the record of marking position;It can solve the technical problems that the welding quality of weld cannot be determined during welding and the defect position is positioned in the prior art, defects can only be found in the way of spot-checking after welding, and the whole section needs to be cut off and re-welded, the amount of rework is large, and the defect position depends on manual search.

Description

Technical Field

[0001] This invention belongs to the technical field of waterproof membrane construction equipment, and specifically relates to a hot air welding device for overlapping edges of waterproof membranes and its welding control method. Background Technology

[0002] In waterproofing construction of building engineering, underground engineering, and municipal engineering, the overlapping edges of polymer waterproof membranes (such as TPO, PVC, HDPE, etc.) are usually sealed using a hot air welding process. This process involves blowing hot air from a hot air gun onto the overlapping interface of two membrane rolls to melt the interface, and then applying pressure with a rolling pressure roller to fuse the overlapping edges into a continuous weld. The accompanying automatic hot air welding equipment (also known as a climbing welder) can automatically move along the overlapping edge, continuously completing the heating, melting, and pressing processes.

[0003] Publication number CN215882639U discloses an automatic welding machine for waterproof membranes, including a frame, a hot air gun, a pressure roller, and other components. The hot air gun blows hot air onto the overlapping edge of the waterproof membrane to melt the overlapping interface, and the pressure roller rolls and applies pressure to the overlapping edge to form a weld, thereby realizing automatic welding of the overlapping edge of the waterproof membrane.

[0004] The existing technology has the following drawbacks:

[0005] Existing automatic welding machines for waterproof membranes can only perform hot air heating and pressure welding. They cannot judge the weld quality online during the welding process, nor can they automatically locate the location of welding defects. After welding, the weld can only be inspected by means of gas filling or vacuum chamber leak detection. Once welding defects such as incomplete welding or insufficient melting are found, the entire weld section often needs to be cut off and re-welded, resulting in a large amount of rework. Moreover, the location of defects depends on manual searching along the weld section by section, which is inefficient and prone to omission. Summary of the Invention

[0006] This invention provides a hot air welding device for overlapping edges of waterproof membrane and its welding control method, which can solve the technical problems in the prior art that the weld fusion quality cannot be determined and the defect location can be located during the welding process, defects can only be found by sampling after welding and require complete cutting and re-welding, the amount of rework is large and the defect location depends on manual search.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] This application provides a hot air welding device for the overlapping edge of a waterproof membrane, including a frame, a hot air gun, a servo drive wheel, a post-weld pressure wheel, and a controller. The frame travels along the traveling direction of the overlapping edge of the waterproof membrane at an adjustable traveling speed. The hot air gun is mounted on the frame, and the air outlet of the hot air gun is provided with a nozzle facing the overlapping edge. The hot air gun blows hot air onto the overlapping edge through the nozzle and melts the overlapping interface of the overlapping edge. The servo drive wheel is connected to the frame and drives the frame to travel. The post-weld pressure wheel is mounted on the frame and located downstream of the hot air gun, and is used to roll and apply pressure to the molten overlapping edge to form a weld.

[0009] A temperature sensing element is installed inside the post-weld pressure roller, and the temperature sensing element continuously measures the post-weld temperature of the weld through the wheel surface of the post-weld pressure roller.

[0010] It also includes a marking nozzle and an encoder. The marking nozzle is mounted on the frame and located downstream of the post-weld pressure roller. The outlet of the marking nozzle faces the weld. The marking nozzle is connected to a paint tank via a solenoid valve. The encoder is connected to the servo drive wheel and is used to detect the travel position of the frame.

[0011] The controller is electrically connected to the temperature sensing element, the solenoid valve, and the encoder respectively. The controller has a preset temperature stored in it. The controller is configured to open the solenoid valve when the post-weld temperature is lower than the preset temperature, so that the marking nozzle sprays marking paint onto the weld at that location, and reads the position data output by the encoder as a record of the marking position at that location.

[0012] The above technical solution uses a temperature sensing element embedded in the pressure roller to continuously measure the post-weld temperature, compares the post-weld temperature with the preset temperature, and sprays a mark when the temperature is lower than the preset temperature. The position is recorded by the encoder. This allows for real-time determination of the weld fusion quality and automatic marking of defect locations during the welding process. This transforms post-weld leak detection and complete section cutting and re-welding into fixed-point repair welding according to the marked positions, significantly reducing rework and eliminating manual searching.

[0013] In a preferred embodiment, the hot air gun operates at a set heating temperature and airflow speed, and also includes a front temperature measuring wheel, which is rotatably mounted on the frame along the travel direction and located upstream of the hot air gun. The wheel surface of the front temperature measuring wheel is used to roll into contact with the upper surface of the overlapping edge. The front temperature measuring wheel is provided with an incoming material temperature sensing element, which is used to measure the surface temperature of the incoming material at the overlapping edge.

[0014] The controller is electrically connected to the incoming material temperature sensing element and the servo drive wheel respectively. The controller uses the surface temperature of the incoming material as a feedforward to adjust the traveling speed. When the surface temperature of the incoming material is lower than the lower limit of the incoming material temperature, the controller reduces the traveling speed to increase the welding heat input; when it is higher than the upper limit of the incoming material temperature, the controller increases the traveling speed to reduce the welding heat input.

[0015] Through the above technical solution, a pre-positioned temperature measuring wheel is used to predictively adjust the travel speed based on the surface temperature of the incoming material before welding. This allows the hot air gun to adapt its heating of the incoming material to the incoming material temperature, thereby reducing insufficient melting or overheating caused by fluctuations in the incoming material temperature and lowering the rate of post-weld rejection. This feedforward speed regulation works in conjunction with the post-weld rejection mark, with the feedforward used to reduce defects and the rejection mark used for bottom-line positioning.

[0016] In a preferred embodiment, the servo drive wheel is driven by a servo motor, and the controller achieves stepless adjustment of the travel speed by adjusting the rotational speed of the servo motor.

[0017] The above technical solution uses a servo motor drive to achieve stepless adjustment of the travel speed, making the travel speed continuously adjustable and forming a smooth closed-loop adjustment with the feedforward amount, thus avoiding the impact of speed jumps caused by graded speed adjustment on welding uniformity.

[0018] As a preferred embodiment, it also includes a shielding assembly connected to the frame and surrounding the outer periphery of the heating zone between the nozzle and the post-weld pressure roller.

[0019] By using the above technical solution, a shielding component is placed around the heating zone to reduce the disturbance of external airflow and sunlight to the heating zone, so that the effective heat input under the set gun parameters remains stable, the interference of environmental disturbances on the post-weld temperature is reduced, and the accuracy of rejection judgment is improved.

[0020] In a preferred embodiment, the controller is further configured to associate the post-weld temperature with the position data output by the encoder to form a temperature-position correspondence record of the weld.

[0021] The above technical solution associates the post-weld temperature with the position data output by the encoder to form a temperature-position correspondence record. The post-weld temperature of each weld is bound to its actual position on the coil. This can be used directly for spot repair welding or as quality traceability data for the entire weld.

[0022] This application also provides a method for controlling hot air welding of overlapping edges of waterproof membranes, using the aforementioned hot air welding equipment for overlapping edges of waterproof membranes, including the following steps:

[0023] Step S1: The frame moves along the overlap edge of the waterproof membrane, the front temperature measuring wheel rolls in contact with the upper surface of the overlap edge, and the incoming material temperature sensing element measures the surface temperature of the incoming material at the overlap edge.

[0024] Step S2: The controller adjusts the traveling speed using the surface temperature of the incoming material as a feedforward, so that the traveling speed is adjusted according to the surface temperature of the incoming material;

[0025] Step S3: The hot air gun blows hot air through the nozzle onto the overlapping edge, causing the overlapping interface of the overlapping edge to melt.

[0026] Step S4: The post-weld pressure roller rolls and applies pressure to the molten overlapping edge to form a weld, and the temperature sensing element continuously measures the post-weld temperature of the weld through the wheel surface of the post-weld pressure roller.

[0027] Step S5: When the post-weld temperature is lower than the preset temperature, the controller opens the solenoid valve to spray marking paint onto the weld at that location using the marking nozzle, and reads the position data output by the encoder as a record of the marking position, so that the weld can be repaired at the recorded position after welding is completed.

[0028] By using the above-mentioned technical solution, pre-weld feedforward speed regulation and post-weld rejection marking are integrated into the same welding process. Feedforward speed regulation suppresses the generation of defects, and rejection marking locks the defect location. The two functions are coupled under the same purpose, realizing online control of weld quality and targeted repair of defects.

[0029] In a preferred embodiment, in step S5, the controller also associates the post-weld temperature with the position data output by the encoder to form a temperature-position correspondence record of the weld.

[0030] By binding and recording the post-weld temperature and location using the above technical solution, data support is provided for targeted repair welding and quality traceability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 An isometric view of a hot air welding device for overlapping edges of waterproof membrane provided in an embodiment of the present invention;

[0033] Figure 2A top view of a hot air welding device for overlapping edges of waterproof membrane provided in an embodiment of the present invention;

[0034] Figure 3 A rear view of a hot air welding device for overlapping edges of waterproof membrane provided in an embodiment of the present invention;

[0035] Figure 4 A side view of a hot air welding device for overlapping edges of waterproof membrane provided in an embodiment of the present invention.

[0036] Icons: 1-Frame; 2-Front temperature measuring wheel; 3-Hot air gun; 301-Air nozzle; 4-Servo drive wheel; 5-Post-weld pressure wheel; 6-Marking nozzle; 601-Solenoid valve; 602-Paint tank; 7-Shielding assembly. Detailed Implementation

[0037] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0038] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to welding, bolting, or riveting; they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] Example:

[0042] Please refer to Figures 1 to 4 , Figures 1 to 4 The image shown is an embodiment of this application.

[0043] This embodiment provides a hot air welding device for the overlapping edge of a waterproof membrane, including a frame 1, a hot air gun 3, a servo drive wheel 4, a post-weld pressure wheel 5, and a controller. The frame 1 travels along the overlapping edge of the waterproof membrane at an adjustable speed. In this embodiment, "upstream" refers to the side closer to the traveling direction of the frame 1, and "downstream" refers to the side away from the traveling direction of the frame 1. That is, along the traveling direction, the component in front is upstream, and the component behind is downstream. The hot air gun 3 is mounted on the frame 1, and the air outlet of the hot air gun 3 is provided with a nozzle 301 facing the overlapping edge. The hot air gun 3 blows hot air onto the overlapping edge through the nozzle 301, melting the overlapping interface of the overlapping edge. In a specific implementation, the nozzle 301 has a flat nozzle structure and is detachably connected to the hot air gun 3. The air outlet is equipped with multiple interchangeable flat nozzles to adapt to overlapping edges of different widths. The nozzle 301 is positioned directly opposite the overlapping edge to concentrate the hot air onto the overlapping interface. The servo drive wheel 4 is connected to the frame 1 and drives the frame 1 to move. In one specific implementation, the servo drive wheel 4 is driven by a servo motor. The post-weld pressure wheel 5 is set on the frame 1 and located downstream of the hot air gun 3. It is used to roll and apply pressure to the molten overlapping edge to form a weld. The post-weld pressure wheel 5 is equipped with a temperature sensing element. The temperature sensing element continuously measures the post-weld temperature of the weld through the wheel surface of the post-weld pressure wheel 5. In one specific implementation, the temperature sensing element is a thermocouple, which is embedded in the inner cavity of the wheel body of the post-weld pressure wheel 5 and arranged close to the inner wall of the wheel surface to measure the post-weld temperature through wheel surface contact.

[0044] As a preferred implementation method, such as Figures 1 to 4 As shown, the above-mentioned equipment also includes a marking nozzle 6 and an encoder. The marking nozzle 6 is mounted on the frame 1 and located downstream of the post-weld pressure roller 5. The outlet of the marking nozzle 6 faces the weld seam. The marking nozzle 6 is connected to a paint tank 602 via a solenoid valve 601. In one specific implementation, the marking nozzle 6 is a nozzle capable of micro-spraying. The paint tank 602 contains marking paint with a significant color difference from the original color of the roll material. When the solenoid valve 601 is energized, the marking nozzle 6 sprays marking paint onto the weld seam surface at that location, forming visible color dots. The encoder is connected to the servo drive wheel 4 for transmission. It is used to detect the travel position of the frame 1. In one specific implementation, the encoder is coaxially connected to the servo drive wheel 4 and outputs pulses as the servo drive wheel 4 rotates to calculate the travel position of the frame 1 along the overlapping edge. The controller is electrically connected to the temperature sensing element, the solenoid valve 601 and the encoder respectively. The controller has a preset temperature stored in it. The controller is configured to open the solenoid valve 601 when the temperature after welding is lower than the preset temperature, so that the marking nozzle 6 sprays marking paint onto the weld at that location, and reads the position data output by the encoder as a record of the marking position at that location.

[0045] It should be noted that, depending on the travel speed and the distance between the marking nozzle 6 and the post-weld pressure wheel 5, the controller will delay driving the solenoid valve 601 to ensure that the marking position is the location of the defect, so that the welding defect can be manually checked after welding.

[0046] As a preferred implementation method, such as Figures 1 to 4 As shown, the hot air gun 3 operates at a set heating temperature and airflow speed. It also includes a front temperature sensing wheel 2, which is rotatably mounted on the frame 1 and located upstream of the hot air gun 3. The wheel surface of the front temperature sensing wheel 2 is used for rolling contact with the upper surface of the overlapping edge. A material temperature sensing element is installed inside the front temperature sensing wheel 2 to measure the surface temperature of the material at the overlapping edge. In one specific implementation, the material temperature sensing element is a thermocouple, embedded in the inner cavity of the front temperature sensing wheel 2 and arranged close to the wheel surface. The controller is electrically connected to both the material temperature sensing element and the servo drive wheel 4. The controller uses the surface temperature of the material as a feedforward to adjust the travel speed. The controller adjusts the travel speed to regulate... The welding heat input at the overlapping edge causes the travel speed to increase as the surface temperature of the incoming material rises and decrease as the surface temperature of the incoming material falls. The controller also has a pre-stored lower limit and upper limit for the incoming material temperature. When the surface temperature of the incoming material is lower than the lower limit, the controller reduces the travel speed; when the surface temperature of the incoming material is higher than the upper limit, the controller increases the travel speed. In one specific implementation, when the surface temperature of the incoming material exceeds the adjustable range defined by the lower and upper limits, and simple speed adjustment cannot bring it back into the range, the controller issues an alarm prompt, and the operator intervenes. The servo drive wheel 4 is driven by a servo motor, and the controller achieves stepless adjustment of the travel speed by adjusting the speed of the servo motor.

[0047] It should be noted that the front temperature measuring wheel 2 feeds back the surface temperature of the area to be welded at a predetermined distance. After the controller performs a delay processing, it adjusts the time it takes for the hot air gun 3 to pass through the corresponding position. Whether it slows down or speeds up is determined based on the preset temperature range.

[0048] As a preferred implementation method, such as Figure 3 As shown, the above-mentioned device also includes a shielding component 7, which is connected to the frame 1 and surrounds the outer periphery of the heating zone between the air nozzle 301 and the post-weld pressure roller 5. In this embodiment, the shielding component 7 can be implemented in any of the following parallel ways:

[0049] (1) Rigid cover type: The shielding component 7 is a three-sided shielding structure. Its top wall and two side walls are closed, and the direction of the flat nozzle is not blocked (i.e., it is open to the front side of the overlapping edge). There is a gap between the bottom and the upper surface of the roll material, which is suitable for windy working surfaces.

[0050] (2) Flexible brush row type: The shielding component 7 is a brush row arranged along the outer periphery of the heating zone. The brushes elastically contact the upper surface of the roll material, which can block the airflow and sweep away sand and dust at the same time. It can also give way when encountering large obstacles, and is suitable for outdoor construction sites with floating dust and sand.

[0051] (3) Flexible curtain type: The shielding component 7 is a flexible curtain hanging on the outer periphery of the heating zone. Its lower edge does not contact the upper surface of the roll material, and it is suitable for flat working surfaces free of debris.

[0052] The unified technical effect of the above three implementation methods is to reduce the disturbance of external airflow and sunlight on the heating zone, and to keep the effective heat input under the set gun parameters stable.

[0053] As a preferred implementation, the controller is also configured to associate the post-weld temperature with the position data output by the encoder to form a temperature-position correspondence record of the weld for use in targeted repair welding and quality traceability.

[0054] It should be noted that the "preset temperature" mentioned in this invention refers to the minimum post-weld temperature that a qualified weld should reach. The method for obtaining the preset temperature is as follows: Before construction, take a sample of the same type of waterproof membrane for trial welding. First, set the initial post-weld temperature based on the experience value. Then, based on the different thicknesses, working conditions and material qualities of the same type of membrane, obtain the optimal welding temperature that makes the weld fusion qualified through a limited number of tests. Use the optimal welding temperature as the preset temperature. For membranes of different batches or different materials, the above method can be used to re-test weld and obtain the corresponding preset temperature.

[0055] It should be noted that in this invention, the frame 1 is connected to the mains power, and a power distribution unit is provided inside the frame 1. The mains power is distributed by the power distribution unit to power components such as the servo motor, hot air gun 3, controller and solenoid valve 601. The frame 1 is also provided with a guide rod for manual pushing, which is used for correction and turning operations during the welding process.

[0056] In use, the equipment is placed above the overlap edge of the waterproof membrane, and the frame 1 moves along the overlap edge. The front temperature measuring wheel 2 first rolls and contacts the upper surface of the overlap edge. The incoming material temperature sensing element measures the surface temperature of the incoming material and sends it as a feedforward to the controller. The controller adjusts the speed of the servo drive wheel 4 accordingly, increasing the speed when the incoming material temperature is too high and decreasing the speed when it is too low, so as to adaptively adjust the heating degree of the hot air gun 3 on the incoming material. The hot air gun 3 blows hot air to the overlap edge through the nozzle 301 to melt the overlap interface. The shielding component 7 protects the heating zone between the nozzle 301 and the post-weld pressure wheel 5 to reduce environmental disturbance. The post-weld pressure wheel 5 rolls against the molten overlap edge. The weld is formed by applying pressure, and the temperature sensing element embedded in it continuously measures the post-weld temperature via the wheel surface and sends it to the controller. The controller compares the post-weld temperature with the preset temperature. When the post-weld temperature is lower than the preset temperature, it is determined that there is a welding defect. The solenoid valve 601 is opened to spray marking paint onto the weld at that location. At the same time, the position data output by the encoder is read to record the location of the defect, and the post-weld temperature is correlated with the location to form a temperature-location correspondence record. After the welding is completed, the operator performs spot repair welding on the weld according to the marking position and the temperature-location correspondence record. There is no need to cut off and re-weld the entire section, nor is there a need to manually search for defects along the weld.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hot air welding device for the overlapping edge of a waterproof membrane, comprising a frame (1), a hot air gun (3), a servo drive wheel (4), a post-weld pressure wheel (5), and a controller, wherein the frame (1) travels along the traveling direction of the overlapping edge of the waterproof membrane at an adjustable traveling speed, the hot air gun (3) is mounted on the frame (1), and the air outlet of the hot air gun (3) is provided with a nozzle (301) facing the overlapping edge, the hot air gun (3) blows hot air to the overlapping edge through the nozzle (301) and melts the overlapping interface of the overlapping edge, the servo drive wheel (4) is connected to the frame (1) and drives the frame (1) to travel, and the post-weld pressure wheel (5) is mounted on the frame (1) and located downstream of the hot air gun (3), used to roll and apply pressure to the molten overlapping edge to form a weld, characterized in that, The post-weld pressure roller (5) is equipped with a temperature sensing element, which continuously measures the post-weld temperature of the weld through the wheel surface of the post-weld pressure roller (5). It also includes a marking nozzle (6) and an encoder. The marking nozzle (6) is disposed on the frame (1) and located downstream of the post-weld pressure roller (5). The outlet of the marking nozzle (6) faces the weld. The marking nozzle (6) is connected to a paint tank (602) via a solenoid valve (601). The encoder is connected to the servo drive wheel (4) and is used to detect the travel position of the frame (1). The controller is electrically connected to the temperature sensing element, the solenoid valve (601) and the encoder respectively. The controller has a preset temperature stored in it. The controller is configured to open the solenoid valve (601) when the temperature after welding is lower than the preset temperature, so that the marking nozzle (6) sprays marking paint onto the weld at that location, and reads the position data output by the encoder as a record of the marking position at that location.

2. The hot air welding equipment for overlapping edges of waterproof membrane according to claim 1, characterized in that, The hot air gun (3) operates at a set heating temperature and airflow speed, and also includes a front temperature measuring wheel (2), which is rotatably mounted on the frame (1) along the travel direction and located upstream of the hot air gun (3). The wheel surface of the front temperature measuring wheel (2) is used to roll contact with the upper surface of the overlapping edge. The front temperature measuring wheel (2) is provided with an incoming material temperature sensing element, which is used to measure the surface temperature of the incoming material at the overlapping edge. The controller is electrically connected to the incoming material temperature sensing element and the servo drive wheel (4) respectively. The controller uses the surface temperature of the incoming material as a feedforward to adjust the traveling speed. When the surface temperature of the incoming material is lower than the lower limit of the incoming material temperature, the controller reduces the traveling speed to increase the welding heat input; when it is higher than the upper limit of the incoming material temperature, the controller increases the traveling speed to reduce the welding heat input.

3. The hot air welding equipment for overlapping edges of waterproof membrane according to claim 2, characterized in that, The servo drive wheel (4) is driven by a servo motor, and the controller achieves stepless adjustment of the travel speed by adjusting the rotation speed of the servo motor.

4. The hot air welding equipment for overlapping edges of waterproof membrane according to claim 3, characterized in that, It also includes a shielding assembly (7), which is connected to the frame (1) and surrounds the outer periphery of the heating zone between the nozzle (301) and the post-weld pressure wheel (5).

5. The hot air welding equipment for overlapping edges of waterproof membrane according to claim 4, characterized in that, The controller is also configured to associate the post-weld temperature with the position data output by the encoder to form a temperature-position correspondence record of the weld.

6. A method for controlling hot air welding of overlapping edges of waterproof membrane, characterized in that, The method using the hot air welding equipment for the overlapping edges of waterproof membranes as described in any one of claims 2 to 5 further includes the following steps: Step S1: The frame (1) moves along the overlapping edge of the waterproof membrane, the front temperature measuring wheel (2) rolls in contact with the upper surface of the overlapping edge, and the incoming material temperature sensing element measures the surface temperature of the incoming material at the overlapping edge. Step S2: The controller adjusts the traveling speed using the surface temperature of the incoming material as a feedforward, so that the traveling speed is adjusted according to the surface temperature of the incoming material; Step S3: The hot air gun (3) blows hot air through the nozzle (301) to the overlapping edge, causing the overlapping interface of the overlapping edge to melt; Step S4: The post-weld pressure roller (5) rolls and applies pressure to the molten overlapping edge to form a weld, and the temperature sensing element continuously measures the post-weld temperature of the weld through the wheel surface of the post-weld pressure roller (5). Step S5: When the post-weld temperature is lower than the preset temperature, the controller opens the solenoid valve (601) to spray marking paint onto the weld at that location, and reads the position data output by the encoder as a record of the marking position, so that the weld at that location can be repaired by spot welding according to the recorded position after welding is completed.

7. The method for controlling hot air welding of overlapping edges of waterproof membrane according to claim 6, characterized in that, In step S5, the controller also associates the post-weld temperature with the position data output by the encoder to form a temperature-position correspondence record of the weld.

Images