Split geotechnical membrane welding apparatus

Abstract

This invention discloses a split-type geomembrane welding device, belonging to the technical field of geomembrane welding equipment, including a lower base body and an upper base body; a tracked chassis, fixedly installed at the top of the upper base body; and an electrical control box, fixedly installed at the top center of the tracked chassis. The invention uses an adjustment mechanism to drive the heating element of the hot wedge to slide left and right to adjust its horizontal position. Three temperature-controlled heating tubes independently control the temperature of the front, middle, and rear sections of the hot wedge. Temperature sensors provide real-time feedback on the temperature of each section and adjust the power accordingly. A laser displacement sensor measures the total overlap thickness of the two geomembrane layers before welding and transmits the data back to the electrical control box. The electrical control box automatically matches the position of the hot wedge with the heating power based on the thickness signal. When welding thin geomembrane with two layers of fabric and one membrane, the hot wedge is slightly adjusted to the left to shorten the heating path and prevent overheating and melting. When welding thick geomembrane with three layers of fabric and two membranes, the hot wedge is slightly adjusted to the right to extend the heating path and ensure sufficient heat penetration, preventing incomplete welds and detachment. No manual repeated trial welding or repair welding is required.

Description

Technical Field

[0001] This invention relates to the field of geomembrane welding device technology, specifically to a split-type geomembrane welding equipment. Background Technology

[0002] Geomembrane is a flexible geosynthetic material made primarily of high-molecular resins such as polyethylene and polyvinyl chloride. It features waterproofing, corrosion resistance, aging resistance, good flexibility, and high strength. It is commonly used in landfills, reservoir dams, artificial lakes, sewage treatment plants, tailings ponds, underground seepage prevention projects, and aquaculture ponds. Its main function is to prevent water seepage, prevent the outward spread of pollutants, and avoid soil erosion and pollution by sewage. Since a single geomembrane has a limited size, multiple sheets need to be spliced ​​together to cover large seepage prevention areas during actual construction. Hot-melt welding allows the contact surfaces of two geomembranes to melt and fuse tightly into one piece. Compared to bonding or overlapping methods, the welded joint has stronger seepage prevention and sealing properties, and its tensile and tear resistance is essentially the same as the parent material. It is less prone to problems such as seam separation, leakage, and peeling, maximizing the integrity and long-term stability of the overall seepage prevention structure, effectively preventing leakage from the splicing seams, and extending the service life of the seepage prevention project.

[0003] The existing welding equipment uses a fixed and uniform heating condition. When welding the overlap of two types of composite geomembranes with different numbers of layers, due to the significant difference in thickness between the two types of geomembranes, local overheating and weld penetration are likely to occur during the welding process of the thin two-layer geomembrane and one-membrane type. In the case of the thick three-layer geomembrane and two-membrane type, the melting is insufficient and the weld is incomplete and separates. In order to ensure the quality of the welded seepage prevention, the construction personnel can only repeatedly repair the welding in sections, which greatly reduces the efficiency of on-site construction. Summary of the Invention

[0004] The purpose of this invention is to provide a split-type geomembrane welding equipment to solve the problems of fixed heating conditions, poor welding effect and low construction efficiency of existing geomembrane welding equipment that cannot adapt to geomembranes of different thicknesses.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a split-type geomembrane welding device, comprising a lower base body and an upper base body;

[0006] It is fixedly installed on the top of the upper base body from the tracked chassis;

[0007] The electrical control box is fixedly installed at the top center of the tracked chassis;

[0008] The main track chassis is fixedly installed at the bottom end of the lower base body;

[0009] A temperature-controlled heating mechanism is fixedly installed at the bottom center of the upper base body;

[0010] The temperature control heating mechanism includes a support frame, an adjustment mechanism, a hot wedge heating body, three temperature control heating tubes, three temperature sensors, and two limiting grooves. The adjustment mechanism is mounted between the inner walls of both sides of the support frame. The hot wedge heating body is fixedly installed on the lower part of the side wall of the downward extension of the adjustment mechanism. The three temperature control heating tubes are all embedded in the inside of the hot wedge heating body. The three temperature sensors are all pre-embedded in the inside of the hot wedge heating body. The two limiting grooves are respectively opened on the other two inner walls of the support frame.

[0011] An adaptive frame is movably mounted on the top left side of the upper base body;

[0012] Two negative pressure exhaust mechanisms are fixedly installed at the bottom end of the adaptive frame and the top left side of the lower base body, respectively;

[0013] Two laser displacement sensors are respectively embedded on the bottom leftmost side of the upper base body and the top leftmost side of the lower base body.

[0014] Furthermore, the adjustment mechanism includes an adjustment screw, an adjustment drive assembly, an adjustment frame, and two protective sleeves. The adjustment frame is the downward extension of the adjustment mechanism. The adjustment screw is mounted between the inner walls of both sides of the support frame via bearings. The output end of the adjustment drive assembly is fixedly installed at one end of the adjustment screw. The adjustment frame is threaded onto the middle of the outer circumferential surface of the adjustment screw and is slidably connected to two limiting grooves. The two protective sleeves are respectively fitted onto the left and right sides of the outer circumferential surface of the adjustment screw.

[0015] Furthermore, the negative pressure exhaust mechanism includes a fixed frame, a vacuum pump, a vacuum adsorption roller, and two sealed bearings. The fixed frame is fixedly installed on the top left side of the lower base body. The vacuum pump is fixedly installed on the upper side of the outer wall of the fixed frame. The vacuum adsorption roller is mounted between the inner walls of both sides of the fixed frame and is connected to the vacuum pump. The two sealed bearings are respectively fixedly installed on the front and rear sides of the outer circumference of the vacuum adsorption roller.

[0016] Furthermore, the negative pressure exhaust mechanism also includes an air intake groove, two sealing strips, a rotating housing, and multiple suction holes. The air intake groove is located at the top center of the vacuum adsorption roller. The two sealing strips are respectively fixedly installed on both sides of the top of the vacuum adsorption roller near the air intake groove. The rotating housing is mounted between the outer peripheral surfaces of two sealed bearings. The multiple suction holes are axially arranged in a strip shape on the outer peripheral surface of the rotating housing.

[0017] Furthermore, multiple compression springs are fixedly connected to the bottom inner wall of the adaptive frame, and the top ends of the multiple compression springs are fixedly connected to the bottom end of the upper base body. Ultrasonic receiving probes are fixedly installed on both sides of the bottom end of the upper base body, and two ultrasonic receiving probes are distributed on the left and right sides of the temperature control heating mechanism. Two telescopic drive assemblies are fixedly installed on the top right side of the upper base body, and pressure roller assemblies are fixedly installed between the output ends of the two telescopic drive assemblies and on the top right side of the lower base body.

[0018] Furthermore, a laser ranging receiver is embedded at the bottom right of the upper base body, a support platform is fixedly installed at the top center of the lower base body, and clearance grooves are provided at both ends of the support platform. A laser ranging transmitter is embedded at the top right of the lower base body, and an ultrasonic transmitting probe is fixedly installed at the center of the inner wall of both clearance grooves.

[0019] Furthermore, the positioning drive assembly, the temperature control heating tube, and the temperature sensor are all electrically connected to the electrical control box. The protective sleeve is configured as a folding structure, and the hot wedge heating body is configured as a wedge-shaped structure. The bottom end face of the hot wedge heating body is flush with the bottom end face of the tracked chassis.

[0020] Furthermore, the diameter of the suction hole is smaller than the width of the suction groove, the outer layer of the rotating shell is wrapped with a thin wear-resistant rubber layer, and the rubber layer has through holes at the position corresponding to the suction hole. The vacuum adsorption roller is configured as a hollow structure, and the vacuum pump is electrically connected to the electrical control box.

[0021] Furthermore, the ultrasonic transmitting probe is located directly below the corresponding ultrasonic receiving probe, the laser ranging transmitting head is located directly below the laser ranging receiving head, a pressure sensor is provided at the connection between the telescopic drive assembly and the pressing roller assembly, the two laser displacement sensors are located on the same vertical line, and the ultrasonic transmitting probe, laser ranging transmitting head, laser ranging receiving head, telescopic drive assembly, ultrasonic receiving probe and pressure sensor are all electrically connected to the electrical control box.

[0022] Furthermore, the electrical control box is equipped with three solid-state relays, and the output shafts of the drive motors of the slave track chassis and the main track chassis are coaxially equipped with encoders. The slave track chassis, the main track chassis, and the laser displacement sensor are all electrically connected to the electrical control box.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) The present invention drives the heating body of the hot wedge to slide left and right to adjust the horizontal position through the adjustment mechanism. Three temperature control heating tubes independently control the temperature of the front, middle and rear sections of the hot wedge. The temperature sensor provides real-time feedback of the temperature of each section and adjusts the power. The laser displacement sensor measures the total thickness of the overlap of the two geomembrane layers before welding and transmits it back to the control box. The control box automatically matches the position of the hot wedge and the heating power according to the thickness signal to achieve adaptive adjustment of the heat input. It can simultaneously eliminate two types of welding defects: false welding and melting through. When welding thin two-layer geomembrane, the hot wedge is slightly adjusted to the left to shorten the heating stroke and prevent overheating and melting through. When welding thick three-layer geomembrane, the hot wedge is slightly adjusted to the right to extend the heating path so that the heat can fully penetrate and prevent false welding from breaking apart. There is no need for manual repeated trial welding and repair welding, which greatly improves the construction efficiency.

[0025] (2) The present invention actively extracts residual air at the interface of the two geomembrane layers before heating and welding through a negative pressure exhaust mechanism. The vacuum pump works continuously to generate negative pressure, and a negative pressure cavity is formed inside the hollow vacuum adsorption roller. When the suction hole on the rotating shell is rotated to the top of the suction groove, it connects with the negative pressure cavity, and the air bubbles between the two membrane materials are uniformly extracted along the axial direction. The pre-extraction process can effectively improve the weld density, eliminate the hidden danger of air bubbles inside the weld before heating and melting, ensure that there are no air bubbles left at the joint, and ensure stable and reliable anti-seepage sealing performance.

[0026] (3) The present invention achieves synchronous movement of the upper and lower bases along the weld direction through a split track drive structure. After welding, the upper and lower bases can be completely separated and transported. The split structure facilitates on-site transportation and solves the problem of difficult transportation of large integrated equipment in complex terrain. At the same time, the ultrasonic transmitting and receiving probes detect the alignment of the upper and lower bases in the width direction, and the laser ranging transmitter and receiver measure the relative position in the direction of travel. Relying on multiple sensors for real-time correction, the accuracy of the split unit's collaborative operation is guaranteed, and the collaborative accuracy of the split structure in the combined working state is guaranteed. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0029] Figure 2 An assembly diagram of the upper base body and its upper components is provided for embodiments of the present invention;

[0030] Figure 3 An assembly diagram of the lower base body and its upper components is provided for embodiments of the present invention;

[0031] Figure 4 A schematic diagram of the temperature-controlled heating mechanism is provided for an embodiment of the present invention;

[0032] Figure 5 A cross-sectional view of the structure of the hot wedge heating element is provided for an embodiment of the present invention;

[0033] Figure 6 A structural cross-sectional view of the adjustment mechanism is provided for an embodiment of the present invention;

[0034] Figure 7 A schematic diagram of the negative pressure exhaust mechanism is provided for an embodiment of the present invention;

[0035] Figure 8 An exploded view of the negative pressure exhaust mechanism is provided for an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Lower base body; 2. Upper base body; 3. Electrical control box; 4. Tracked chassis; 5. Main tracked chassis; 6. Temperature control heating mechanism; 7. Adaptive frame; 8. Negative pressure exhaust mechanism; 9. Compression spring; 10. Laser displacement sensor; 11. Ultrasonic receiving probe; 12. Telescopic drive assembly; 13. Pressing roller assembly; 14. Laser ranging receiver head; 15. Support platform; 16. Clearance groove; 17. Laser ranging transmitter head; 18. 61. Ultrasonic transmitting probe; 62. Support frame; 63. Adjustment mechanism; 64. Heating wedge; 65. Temperature-controlled heating tube; 66. Temperature sensor; 67. Limiting groove; 68. Adjustment screw; 69. Adjustment drive assembly; 60. Adjustment frame; 61. Protective sleeve; 82. Fixing frame; 83. Vacuum pump; 84. Vacuum adsorption roller; 85. Sealed bearing; 86. Suction groove; 87. Sealing strip; 88. Rotating outer shell; 89. Suction hole. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] As attached Figure 1 To be continued Figure 8 As shown:

[0040] Example 1:

[0041] This invention provides a split-type geomembrane welding equipment, including a lower base body 1 and an upper base body 2. The upper and lower bases are set separately and independently, and can be disassembled and transported, making it suitable for transport operations on steep slopes and narrow construction sites.

[0042] It is fixedly installed on the top of the upper base body 2 from the tracked chassis 4;

[0043] The electrical control box 3 is fixedly installed at the top center of the tracked chassis 4. The electrical control box 3 integrates the control components of the whole machine.

[0044] The main track chassis 5 is fixedly installed at the bottom of the lower base body 1;

[0045] The temperature-controlled heating mechanism 6 is fixedly installed at the bottom center of the upper base body 2;

[0046] The temperature-controlled heating mechanism 6 includes a support frame 61, an adjustment mechanism 62, a hot wedge heating body 63, three temperature-controlled heating tubes 64, three temperature sensors 65, and two limiting grooves 66. The adjustment mechanism 62 is mounted between the inner walls of both sides of the support frame 61. The hot wedge heating body 63 is fixedly installed on the lower part of the side wall of the downward extension of the adjustment mechanism 62. The three temperature-controlled heating tubes 64 are all embedded inside the hot wedge heating body 63, with a single tube power of 800W to 1200W and a total power of 2400W to 3600W. The three temperature sensors 65 are all pre-embedded inside the hot wedge heating body 63. The accuracy of the three temperature sensors 65 is ±1.5℃, and the temperature control resolution is 0.5℃. The two limiting grooves 66 are respectively opened on the inner walls of the other two sides of the support frame 61.

[0047] The adaptive frame 7 is movably installed on the top left side of the upper base body 2;

[0048] Two negative pressure exhaust mechanisms 8 are fixedly installed at the bottom of the adaptive frame 7 and the top left side of the lower base body 1, respectively;

[0049] Two laser displacement sensors 10 are respectively embedded on the bottom left of the upper base body 2 and the top left of the lower base body 1. The detection range of the two laser displacement sensors 10 is 0.5mm~50mm, the accuracy is ±20μm, and the sampling frequency is ≥100Hz. The laser displacement sensors 10, which are emitted from the top and bottom, detect the actual thickness of the geomembrane in real time, providing data for temperature control adjustment.

[0050] The adjustment mechanism 62 includes an adjustment screw 621, an adjustment drive assembly 622, an adjustment frame 623, and two protective sleeves 624. The adjustment frame 623 is the downward extension of the adjustment mechanism 62. The adjustment screw 621 is mounted between the inner walls of the two sides of the support frame 61 via bearings. The output end of the adjustment drive assembly 622 is fixedly installed at one end of the adjustment screw 621. The adjustment drive assembly 622 uses a servo motor to drive the adjustment screw 621 to rotate. The adjustment frame 623 is threadedly installed in the middle of the outer circumferential surface of the adjustment screw 621, and the adjustment frame 623 is slidably connected to two limiting grooves 66. The two protective sleeves 624 are respectively fitted on the left and right sides of the outer circumferential surface of the adjustment screw 621.

[0051] The adjustment drive assembly 622, the temperature control heating tube 64, and the temperature sensor 65 are all electrically connected to the electrical control box 3. The electrical control box 3 receives thickness and temperature signals and automatically matches the heating power with the position of the hot wedge heating body 63. The protective sleeve 624 is set as a folding structure. The protective sleeve 624 extends and folds along with the adjustment frame 623 during movement, and always wraps around the outer periphery of the adjustment screw 621 to prevent dust from entering. The hot wedge heating body 63 is set as a wedge-shaped structure. The wedge tip is easy to insert into the gap of the membrane material. The heat penetrates the geomembrane substrate layer by layer. The bottom surface of the hot wedge heating body 63 is flush with the bottom surface of the tracked chassis 4. The height is flush to ensure that the heating body is stably attached to the geomembrane and there is no problem of uneven heating due to local suspension.

[0052] The electrical control box 3 is equipped with three solid-state relays. These relays adjust the heating power without contact, providing fast temperature control response and high precision. Encoders are coaxially mounted on the output shafts of the drive motors of both the tracked chassis 4 and the main tracked chassis 5. The walking speed of the main tracked chassis 5 and the tracked chassis 4 is infinitely adjustable from 0.5 to 3.0 m / min. The encoder resolution is 1024 P / R (pulses / revolution). The encoder collects the track speed in real time, and the electrical control box 3 uses closed-loop speed control to ensure synchronous movement of the upper and lower chassis. The tracked chassis 4, the main tracked chassis 5, and the laser displacement sensor 10 are all electrically connected to the electrical control box 3. The electrical control box 3 receives walking and thickness detection signals and controls the welding process of the entire machine in a coordinated manner.

[0053] This invention is applicable to various composite geomembranes with a thickness range of 1.0mm to 6.0mm, including two-layer geotextile and one-layer geomembrane, three-layer geotextile and two-layer geomembrane, and multi-layer composite structures. The equipment can adapt to the following construction environment conditions: ambient temperature -10℃ to +50℃, construction slope ≤30°. Applicable scenarios include landfills, reservoir dams, artificial lakes, sewage treatment ponds, tailings ponds, tunnel seepage prevention, and aquaculture ponds, etc. The overall protection configuration of the equipment is as follows: the electrical control box 3 adopts an IP54 protection rating. Both the tracked chassis 4 and the main tracked chassis 5 adopt a sealed chassis structure, which can operate normally in conventional dusty environments, wet and slippery surfaces, and slightly muddy surfaces. However, this equipment is not suitable for underwater immersion operations or open-air construction in continuous heavy rain and snow.

[0054] This equipment has the dual-track operation capability of simultaneously welding two parallel weld seams in a single journey. Specifically, the hot wedge heating body 63 of the temperature control heating mechanism 6 is set as a double wedge end face structure. Two wedge tips are arranged side by side along the width direction on the bottom end face of the same hot wedge heating body 63, and the two wedge tips correspond to the heating positions of the two weld seams respectively. Two sets of pressure roller assemblies 13 symmetrically arranged at the bottom of the upper base body 2 are matched with the two wedge tips one by one to form two independent welding operation lines. The equipment can complete the dual-track hot melt welding simultaneously in a single journey.

[0055] The spacing between the two weld seams is adjusted by replacing parts. The first adjustment method is to replace the hot wedge heating element 63 with a different specification. The center distance between the two sets of wedge tips of different models of hot wedge heating elements 63 is different. The adjustable spacing of the weld seams covers the range of 50mm to 200mm, which is suitable for the double-seam cavity design requirements of various seepage prevention projects. The second adjustment method is to add shims of different thicknesses to the mounting base of the pressing roller assembly 13, and finely adjust the lateral installation position of the two sets of pressing roller assemblies 13 to ensure that the pressing station is accurately aligned with the replaced hot wedge tip.

[0056] The hot wedge heating element 63 is electrically connected to the electrical control box 3 using a standard aviation plug connector. Replacement work does not require disassembling the support frame 61, the adjustment mechanism 62 and other peripheral parts. On the construction site, the corresponding specification hot wedge can be quickly replaced according to the drawing requirements, and the center spacing of the double weld seam can be flexibly switched.

[0057] Working Principle: Before welding begins, the operator first confirms whether the construction conditions meet the applicable conditions of this equipment. This equipment is suitable for various composite geomembranes with a thickness range of 1.0mm to 6.0mm, including two-layer geomembrane, three-layer geomembrane, and multi-layer composite structures. The applicable ambient temperature is -10℃ to +50℃, and the applicable construction slope is ≤30°. Typical construction scenarios include landfills, reservoir dams, artificial lakes, sewage treatment ponds, tailings ponds, tunnel seepage prevention, and aquaculture ponds, etc. After confirming that the working conditions meet the applicable conditions, the operator lays the overlap of the two layers of geomembrane flat on the top of the lower base body 1, with the lower geomembrane covering the top. On the upper surface of the lower base body 1, the upper geomembrane overlaps the lower geomembrane. The upper base body 2 is lowered so that the wedge-shaped tip of the heating element 63 is horizontally inserted between the overlapping interfaces of the two geomembranes. The upper surface of the heating element 63 adheres to the lower surface of the upper geomembrane, and the lower surface adheres to the upper surface of the lower geomembrane. The two surfaces simultaneously heat and melt the bonding surfaces of the two geomembranes. After the upper and lower bases press the membrane materials together, two laser displacement sensors 10 detect their respective distances to the other base, measuring the height distance between the upper base body 2 and the lower base body 1 in real time and feeding the signal back to the electrical control box 3. The electrical control box 3... The total overlap thickness of the membrane material is calculated based on the spacing signal and the corresponding welding parameters are automatically matched. The electrical control box 3 then sends a command to the adjustment drive assembly 622. The adjustment drive assembly 622 drives the adjustment screw 621 to rotate in the forward or reverse direction, and drives the adjustment frame 623 to slide in the left and right directions under the constraint of the two limit grooves 66. The hot wedge heating body 63 moves to the left or right to a horizontal position that matches the current membrane material thickness. If the project requires double-track welds, the double wedge heating body 63 with the corresponding center distance specification can be replaced in advance. The equipment completes the heating and melting of two welds simultaneously in a single movement. The negative pressure exhaust mechanism 8 serves as the membrane material conveying front. The hot wedge heating element 63 is positioned and slides left and right through the adjustment mechanism 62 to change the horizontal distance between it and the negative pressure exhaust mechanism 8, thereby adapting to the heat input required for different thickness membrane materials. After the parameters and position are adjusted, the equipment is started. The main tracked chassis 5 and the secondary tracked chassis 4 move forward synchronously, driving the upper base body 2 and the lower base body 1 to move along the weld direction. During the synchronous walking welding process, the electrical control box 3 collects the thickness signal of the laser displacement sensor 10, the three-zone temperature feedback data of the temperature sensor 65, the pressing force value of the pressure sensor, and the walking speed fed back by the encoder in real time, forming a multi-parameter closed-loop control logic.When any parameter exceeds the preset threshold (temperature fluctuation exceeds ±5℃, pressure deviation exceeds ±10%, or walking speed sudden change exceeds ±8%), the electrical control box 3 automatically triggers an audible and visual alarm and stops walking. Welding can only continue after the parameter returns to the preset range. The electrical control box 3 drives three solid-state relays to independently control three temperature-controlled heating tubes 64 to heat the front, middle, and rear sections of the hot wedge heating body 63 in sections according to the preset temperature curve. Three temperature sensors 65 detect the actual temperature of each section in real time and feed it back to the electrical control box 3 to form a closed-loop temperature control. When welding thin geomembrane with two layers of fabric and one layer of membrane, the hot wedge heating body 63 is slightly adjusted to the left to shorten the heating stroke of the geomembrane, reduce heat input, and prevent the surface layer from overheating and melting. When welding thick geomembrane with three layers of fabric and two layers of membrane, the hot wedge heating body 63 is slightly adjusted to the right to extend the heating and melting path, allowing heat to fully penetrate the multi-layer substrate and ensure that the inner layer is fully melted. After welding is completed, the operator turns off the equipment and lifts the upper base body 2 upwards. The upper base body 2 is completely separated from the lower base body 1, and the two parts can be transported to the next working surface for recombination and reuse.

[0058] Example 2:

[0059] This embodiment is basically the same as the previous embodiment, except that the negative pressure exhaust mechanism 8 includes a fixed frame 81, a vacuum pump 82, a vacuum adsorption roller 83, and two sealed bearings 84. The fixed frame 81 is fixedly installed on the top left side of the lower base body 1. The vacuum pump 82 is fixedly installed on the upper side of the outer wall of the fixed frame 81. The pumping speed of the vacuum pump 82 is ≥2L / s, and the ultimate negative pressure can reach -0.08MPa. The vacuum adsorption roller 83 is mounted between the inner walls of both sides of the fixed frame 81, and the vacuum adsorption roller 83 is connected to the vacuum pump 82. The two sealed bearings 84 are respectively fixedly installed on the front and rear sides of the outer circumference of the vacuum adsorption roller 83.

[0060] The negative pressure exhaust mechanism 8 also includes an air intake groove 85, two sealing strips 86, a rotating housing 87, and multiple suction holes 88. The air intake groove 85 is located at the top center of the vacuum adsorption roller 83. The two sealing strips 86 are fixedly installed on both sides of the top of the vacuum adsorption roller 83 near the air intake groove 85. The rotating housing 87 is mounted between the outer peripheral surfaces of the two sealing bearings 84. Multiple suction holes 88 are provided in a strip shape along the axial direction on the outer peripheral surface of the rotating housing 87.

[0061] The diameter of the suction hole 88 is smaller than the width of the suction groove 85, so that the adsorption force is dispersed when it is transmitted from the suction groove 85 to multiple suction holes 88, avoiding excessive local single-point stress on the geomembrane and causing damage. At the same time, it ensures that the negative pressure airflow is evenly distributed in the membrane overlap area. The outer layer of the rotating shell 87 is wrapped with a thin wear-resistant rubber layer. The rubber layer increases the friction of the membrane material and buffers the hard shell from scratching the impermeable geomembrane. The rubber layer has through holes at the positions corresponding to the suction holes 88. The through holes correspond one-to-one with the suction holes 88, and the negative pressure airflow can normally penetrate the rubber layer to adsorb the membrane material. The vacuum adsorption roller 83 is set with a hollow structure. The hollow inner cavity serves as a negative pressure storage chamber, stabilizing the suction force at all parts of the roller body without suction fluctuation. The vacuum pump 82 is electrically connected to the electrical control box 3. The electrical control box 3 can adjust the power of the vacuum pump 82 according to the membrane thickness to match the adsorption negative pressure required for different geomembranes.

[0062] Working principle: The operator lays the overlap of a thin two-layer geomembrane or a thick three-layer geomembrane on the top of the lower base body 1, lowers the upper base body 2, and starts the equipment. The main tracked chassis 5 and the secondary tracked chassis 4 move forward synchronously. The electrical control box 3 controls the vacuum pump 82 to work continuously to generate negative pressure. A negative pressure cavity is formed inside the hollow vacuum adsorption roller 83. The rotating outer shell 87 rotates continuously around the vacuum adsorption roller 83 under the friction of the two layers of geomembrane. When the multiple suction holes 88 on the rotating outer shell 87 rotate to be directly above the suction groove 85 at the top center of the vacuum adsorption roller 83, the suction holes 88 are connected to the negative pressure cavity inside the vacuum adsorption roller 83. The two sealing strips 86 located on both sides of the top of the suction groove 85 limit the negative pressure range to the width area of ​​the suction groove 85, so that the negative pressure only acts on the suction holes 88 corresponding to the suction groove 85. The outer layer of the rotating outer shell 87 is wrapped with... The thin, wear-resistant rubber layer is tightly bonded to the surface of the upper geomembrane. The residual air at the interface between the two membrane layers is uniformly extracted in a strip along the axial direction through the suction hole 88. As the rotating shell 87 continues to rotate, the suction hole 88 moves away from directly above the suction groove 85 and disconnects from the negative pressure chamber, thus eliminating the negative pressure and completing one adsorption and exhaust cycle. During continuous movement, the rotating shell 87 repeatedly performs the cycle of connecting the negative pressure, suction and exhaust, and disconnecting the negative pressure, continuously performing pre-weld exhaust treatment on the entire weld. After exhaust treatment, the two geomembranes then enter the temperature-controlled heating mechanism 6 for hot-melt welding. Since the air at the interface has been removed before heating, no air bubbles are generated when the hot wedge heating body 63 heats and melts the two membrane layers, ensuring that the weld is dense and free of pores. After welding is completed, the vacuum pump 82 is turned off and the negative pressure disappears. The upper base body 2 can be lifted upwards to separate from the lower base body 1.

[0063] Example 3:

[0064] This embodiment is basically the same as the previous embodiment, except that multiple compression springs 9 are fixedly connected to the bottom inner wall of the adaptive frame 7, and the top ends of the multiple compression springs 9 are fixedly connected to the bottom end of the upper base body 2. Ultrasonic receiving probes 11 are fixedly installed on both sides of the bottom end of the upper base body 2, and the two ultrasonic receiving probes 11 are distributed on the left and right sides of the temperature control heating mechanism 6. Two telescopic drive assemblies 12 are fixedly installed on the top right side of the upper base body 2, and pressure roller assemblies 13 are fixedly installed between the output ends of the two telescopic drive assemblies 12 and on the top right side of the lower base body 1.

[0065] A laser ranging receiver 14 is embedded at the bottom right of the upper base body 2. A support platform 15 is fixedly installed at the top center of the lower base body 1. Both ends of the support platform 15 have clearance grooves 16. A laser ranging transmitter 17 is embedded at the top right of the lower base body 1. The measuring range of the laser ranging transmitter 17 and the laser ranging receiver 14 is 0-200mm, and the accuracy is ±0.1mm. An ultrasonic transmitting probe 18 is fixedly installed in the middle of the inner wall of the two clearance grooves 16. The working frequency of the ultrasonic transmitting probe 18 is 40kHz, and the corresponding ultrasonic receiving probe 11 has a detection distance accuracy of ±0.5mm.

[0066] The ultrasonic transmitting probe 18 is located directly below the corresponding ultrasonic receiving probe 11. This vertical alignment ensures stable acoustic signal transmission and accurate, reliable detection data. The laser ranging transmitter 17 is located directly below the laser ranging receiver 14. Together, they form a vertical ranging structure used to detect the relative displacement deviation between the upper base body 2 and the lower base body 1 in the direction of travel in real time. A pressure sensor is installed at the connection between the telescopic drive assembly 12 and the pressing roller assembly 13. This pressure sensor has a range of 0–500 N and an accuracy of ±1.5%FS (full scale). The pressure sensor collects the weld clamping force in real time and provides feedback. The electrical control box 3 adjusts the telescopic pressing stroke. Two laser displacement sensors 10 are located on the same vertical line to detect the relative height change between the upper base body 2 and the lower base body 1 in real time. The relative height change signal is processed by the electrical control box 3 and used as the basis for judging the degree of undulation of the geomembrane laying and the change of the total overlap thickness. The ultrasonic transmitting probe 18, the laser ranging transmitter 17, the laser ranging receiver 14, the telescopic drive assembly 12, the ultrasonic receiving probe 11, and the pressure sensor are all electrically connected to the electrical control box 3. The electrical control box 3 summarizes all the sensor detection data and automatically matches the heating, negative pressure, and pressing welding parameters.

[0067] The top surfaces of the support platform 15, the rotating outer shell 87 on the lower side, and the pressing roller assembly 13 are flush with each other, so that the geomembrane is transported horizontally and stably throughout the process, ensuring consistent bonding accuracy in the adsorption, testing, and pressing processes.

[0068] Working principle: The operator lays the overlap of a thin two-layer geomembrane or a thick three-layer geomembrane on the top of the lower base body 1. The front end of the overlap passes the negative pressure exhaust mechanism 8 above the lower base body 1, the middle section of the overlap is placed on the top surface of the support platform 15, and the rear end of the overlap passes above the pressing roller assembly 13 on the lower base body 1. Then the upper base body 2 is lowered. The negative pressure exhaust mechanism 8 at the bottom of the adaptive frame 7 first contacts the surface of the upper geomembrane. Multiple compression springs 9 inside the adaptive frame 7 automatically compress or rebound according to the thickness of the membrane material, so that the negative pressure exhaust mechanism 8 always adheres to the surface of the membrane material. During the movement of the equipment, the clearance groove 1... Two ultrasonic transmitting probes 18 inside the 6 emit ultrasonic waves upwards. After passing through the gap between the upper and lower bases, the sound waves are received by the corresponding two ultrasonic receiving probes 11. The control box 3 judges the alignment deviation of the upper base body 2 and the lower base body 1 in the width direction based on the sound wave transmission time, and keeps the upper and lower bases aligned by adjusting the differential speed of the tracks on both sides. The laser ranging transmitter 17 emits a laser upwards. The beam reaches the laser ranging receiver 14. The control box 3 calculates the displacement deviation of the upper and lower bases in the direction of travel based on the laser signal, and dynamically matches the travel speed of the main track chassis 5 and the driven track chassis 4 to ensure that the two are synchronized. The telescopic drive assembly 12 extends downwards, driving the upper and lower sets of pressing roller assemblies 13 to press against each other. The pressure sensor at the connection between the telescopic drive assembly 12 and the pressing roller assembly 13 collects the pressing force in real time and feeds it back to the control box 3. The control box 3 automatically adjusts the downward stroke and pressing force based on the detected membrane thickness. When the geomembrane overlap seam, which has been melted by the temperature-controlled heating mechanism 6, passes through the pressing roller assembly 13, it is uniformly pressed and fused to form a dense and continuous weld. After welding, the operator inspects the weld quality according to the following inspection methods: visually check whether the weld is continuous, free of scorch, holes, and wrinkles; cut 1 section of weld every 100m. For a 0.00mm wide sample, a peel test is performed according to GB / T17643. The peel strength is not less than 80% of the measured strength of the base material. For the cavity in the middle of the double-track weld, compressed air of 0.15MPa to 0.20MPa is used for inflation and pressure holding for 3 minutes. The pressure drop is not more than 0.01MPa to be considered qualified. For the single-track weld, a vacuum hood negative pressure method (-0.05MPa, held for 5s) is used. No bubbles continuously emerge to be considered qualified. All test parameters are automatically recorded and archived by the electrical control box 3. After welding is completed, the power is cut off, the telescopic drive component 12 automatically retracts, and the upper base body 2 is lifted upward to completely separate from the lower base body 1.

[0069] Example 4:

[0070] Based on Embodiments 1 to 3 above, this embodiment further integrates pre-welding cleaning and dust removal functions, post-welding air pressure detection functions, and a digital data traceability system, forming a complete integrated operation process of pre-welding treatment, welding execution, post-welding inspection, and data traceability.

[0071] Pre-welding cleaning and dust removal function: On the far left of the lower base body 1, in front of the installation positions of the two laser displacement sensors 10, a cleaning device mounting bracket is reserved. This mounting bracket can be equipped with a rotating brush cleaning roller or a negative pressure dust suction port according to the actual needs of the construction site. The rotating brush cleaning roller is driven by a motor to rotate and physically clean the floating dust and sand particles on the upper surface of the lower geomembrane. The negative pressure dust suction port can be equipped with an external or internal small dust removal fan, which generates negative pressure during operation to promptly extract and collect the dust particles raised during cleaning. The cleaning device is controlled by the electrical control box 3 to start and stop automatically before the welding operation starts, removing dust, sand particles and water stains from the overlapping area, ensuring that the interface between the two geomembranes is clean and free of impurities, and preventing foreign objects from embedding into the weld seam during the hot melt welding process and forming a leakage channel.

[0072] Post-weld gas pressure detection and data traceability system: For double-rail weld structures, this embodiment integrates a unified gas pressure detection and data storage and transmission module, specifically including an inflation interface, pressure sensor, pressure holding solenoid valve, wireless communication unit, and a gas pressure detection and control module and local storage module built into the electrical control box 3; a closed intermediate cavity is naturally formed between the two parallel welds of the double-rail weld, the inflation interface is located at the beginning of the cavity, the pressure sensor is arranged at the inflation interface to collect the gas pressure in the cavity in real time, and the pressure holding solenoid valve is located between the inflation interface and the external gas source to control the inflation on and off; after welding is completed, the electrical control... Box 3 controls the opening of the pressure-holding solenoid valve, and injects compressed air at 0.15MPa to 0.20MPa into the cavity between the double-rail welds through the air filling interface. After the air filling is completed, the pressure-holding solenoid valve is closed and the pressure-holding monitoring stage begins. The standard pressure-holding time is 3 minutes. The pressure sensor continuously collects the air pressure value and transmits it back to the control box 3 in real time. If the pressure drop does not exceed 0.01MPa during the entire pressure-holding process, the weld is deemed to have qualified anti-seepage performance. If the pressure drop exceeds 0.01MPa, the weld is deemed to have a leakage defect. The control box 3 automatically marks the weld mileage location corresponding to the defect and triggers an audible and visual alarm to prompt on-site repair welding.

[0073] During the operation of the machine, the electrical control box 3 synchronously records all key welding parameters for each operation, including geomembrane thickness, hot wedge position, heating temperature, track walking speed, pressure holding air pressure, and pressure drop value. The equipment has built-in Wi-Fi, 4G, and 5G wireless communication units, which can upload all welding and inspection data to the local server or cloud database in real time, completely retain the construction and inspection records of each weld, realize full-cycle traceability of weld quality, and facilitate project completion acceptance and subsequent leakage problem tracing and investigation.

[0074] The pre-welding cleaning and dust removal function of this embodiment can remove impurities from the lap joint surface in advance, eliminating the potential for weld leakage caused by foreign object embedding from the source; the post-welding air pressure detection system can complete non-destructive full-length automatic leak detection of double-track welds, and with the local storage and wireless cloud upload function, there is no need for manual on-site recording or additional testing equipment, which greatly improves the controllability of welding quality and construction inspection efficiency.

[0075] Maintenance and Disassembly: All moving parts and vulnerable components of this equipment adopt standardized interface design. The track plates of both the tracked chassis 4 and the main tracked chassis 5 are modular rubber track structures. Replacement only requires loosening the tension bolts to remove the old track and insert the new track; there is no need to disassemble the drive motor. Replacement time for a single track is ≤15 minutes. The pressure roller assembly 13 adopts a quick-release bearing housing structure; loosening two M8 bolts allows the entire pressure roller assembly 13 to be pulled out of the bearing housing. The rubber layer on the roller surface can be replaced individually without replacing the entire roller body. The rotating outer shell 87 of the vacuum adsorption roller 83 and its outer protective layer are durable. The rubber thin layer is an independent kit. After removing the sealing bearings 84 at both ends, the rotating outer shell 87 can be pulled out from the outer circumference of the vacuum adsorption roller 83 for replacement. The temperature control heating tube 64 and the temperature sensor 65 are connected to the electrical control box 3 using standard plug-in aviation connectors. The plugging and unplugging replacement time is ≤2 minutes. The equipment comes with a special tool kit, including an Allen wrench, a bearing puller, and a rubber hammer. It also comes with an illustrated maintenance manual, which includes a fault code table, a list of vulnerable parts, and replacement step diagrams. Ordinary maintenance personnel only need 30 minutes of training to independently complete the daily maintenance of the equipment and the replacement of various vulnerable parts.

[0076] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A split-type geomembrane welding equipment, characterized in that, include: Lower base body (1) and upper base body (2); It is fixedly installed on the top of the upper base body (2) from the tracked chassis (4); The electrical control box (3) is fixedly installed at the top center of the tracked chassis (4); The main track chassis (5) is fixedly installed at the bottom end of the lower base body (1); Temperature control heating mechanism (6) is fixedly installed at the bottom center of the upper base body (2); The temperature control heating mechanism (6) includes a support frame (61), an adjustment mechanism (62), a hot wedge heating body (63), three temperature control heating tubes (64), three temperature sensors (65), and two limiting grooves (66). The adjustment mechanism (62) is mounted between the inner walls of the two sides of the support frame (61). The hot wedge heating body (63) is fixedly installed on the lower part of the side wall of the downward extension of the adjustment mechanism (62). The three temperature control heating tubes (64) are all embedded in the inside of the hot wedge heating body (63). The three temperature sensors (65) are all pre-embedded in the inside of the hot wedge heating body (63). The two limiting grooves (66) are respectively opened on the other two inner walls of the support frame (61). An adaptive frame (7) is movably installed on the top left side of the upper base body (2); Two negative pressure exhaust mechanisms (8) are fixedly installed at the bottom end of the adaptive frame (7) and the top left side of the lower base body (1), respectively; Two laser displacement sensors (10) are respectively embedded on the leftmost bottom end of the upper base body (2) and the leftmost top end of the lower base body (1).

2. The split-type geomembrane welding equipment according to claim 1, characterized in that, The adjustment mechanism (62) includes an adjustment screw (621), an adjustment drive assembly (622), an adjustment frame (623), and two protective sleeves (624). The adjustment frame (623) is the downward extension of the adjustment mechanism (62). The adjustment screw (621) is mounted between the inner walls of the two sides of the support frame (61) via bearings. The output end of the adjustment drive assembly (622) is fixedly installed at one end of the adjustment screw (621). The adjustment frame (623) is threaded onto the middle of the outer circumferential surface of the adjustment screw (621), and the adjustment frame (623) is slidably connected to two limiting grooves (66). The two protective sleeves (624) are respectively fitted on the left and right sides of the outer circumferential surface of the adjustment screw (621).

3. The split-type geomembrane welding equipment according to claim 1, characterized in that, The negative pressure exhaust mechanism (8) includes a fixed frame (81), a vacuum pump (82), a vacuum adsorption roller (83), and two sealed bearings (84). The fixed frame (81) is fixedly installed on the top left side of the lower base body (1). The vacuum pump (82) is fixedly installed on the upper side of the outer wall of the fixed frame (81). The vacuum adsorption roller (83) is mounted between the inner walls of both sides of the fixed frame (81) and is connected to the vacuum pump (82). The two sealed bearings (84) are fixedly installed on the front and rear sides of the outer circumference of the vacuum adsorption roller (83), respectively.

4. The split-type geomembrane welding equipment according to claim 3, characterized in that, The negative pressure exhaust mechanism (8) also includes an air intake groove (85), two sealing strips (86), a rotating shell (87), and multiple suction holes (88). The air intake groove (85) is located at the top center of the vacuum adsorption roller (83). The two sealing strips (86) are fixedly installed on both sides of the top of the vacuum adsorption roller (83) near the air intake groove (85). The rotating shell (87) is mounted between the outer peripheral surfaces of two sealing bearings (84). The multiple suction holes (88) are axially arranged in a strip shape on the outer peripheral surface of the rotating shell (87).

5. The split-type geomembrane welding equipment according to claim 1, characterized in that, Multiple compression springs (9) are fixedly connected to the bottom inner wall of the adaptive frame (7), and the top ends of the multiple compression springs (9) are fixedly connected to the bottom end of the upper base body (2). Ultrasonic receiving probes (11) are fixedly installed on both sides of the bottom end of the upper base body (2), and the two ultrasonic receiving probes (11) are distributed on the left and right sides of the temperature control heating mechanism (6). Two telescopic drive assemblies (12) are fixedly installed on the right side of the top end of the upper base body (2), and pressure roller assemblies (13) are fixedly installed between the output ends of the two telescopic drive assemblies (12) and on the right side of the top end of the lower base body (1).

6. The split-type geomembrane welding equipment according to claim 5, characterized in that, A laser ranging receiver (14) is embedded at the bottom right of the upper base body (2). A support platform (15) is fixedly installed at the top center of the lower base body (1). Both ends of the support platform (15) are provided with clearance grooves (16). A laser ranging transmitter (17) is embedded at the top right of the lower base body (1). An ultrasonic transmitter (18) is fixedly installed in the middle of the inner wall of both clearance grooves (16).

7. A split-type geomembrane welding equipment according to claim 2, characterized in that, The position adjustment drive assembly (622), the temperature control heating tube (64) and the temperature sensor (65) are all electrically connected to the electrical control box (3). The protective sleeve (624) is configured as a folding structure, and the hot wedge heating body (63) is configured as a wedge-shaped structure. The bottom end face of the hot wedge heating body (63) is flush with the bottom end face of the tracked chassis (4).

8. A split-type geomembrane welding equipment according to claim 4, characterized in that, The diameter of the suction hole (88) is smaller than the width of the suction groove (85). The outer layer of the rotating shell (87) is wrapped with a thin wear-resistant rubber layer, and the rubber layer has a through hole at the position corresponding to the suction hole (88). The vacuum adsorption roller (83) is set as a hollow structure. The vacuum pump (82) is electrically connected to the electrical control box (3).

9. A split-type geomembrane welding device according to claim 6, characterized in that, The ultrasonic transmitting probe (18) is located directly below the corresponding ultrasonic receiving probe (11), the laser ranging transmitter (17) is located directly below the laser ranging receiver (14), a pressure sensor is provided at the connection between the telescopic drive assembly (12) and the pressing roller assembly (13), the two laser displacement sensors (10) are located on the same vertical line, and the ultrasonic transmitting probe (18), the laser ranging transmitter (17), the laser ranging receiver (14), the telescopic drive assembly (12), the ultrasonic receiving probe (11) and the pressure sensor are all electrically connected to the electrical control box (3).

10. A split-type geomembrane welding device according to claim 1, characterized in that, The electrical control box (3) is equipped with three solid-state relays. The output shafts of the drive motors of the secondary tracked chassis (4) and the main tracked chassis (5) are coaxially equipped with encoders. The secondary tracked chassis (4), the main tracked chassis (5) and the laser displacement sensor (10) are all electrically connected to the electrical control box (3).

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