Roller folding and pulling system and method for trenchless pipe rehabilitation

Abstract

The present application relates to a roller folding traction system and method for trenchless pipe repair. The system mainly consists of a traction machine, a feeding mechanism and a folding device between the traction machine and the feeding mechanism. The folding device is provided with a conveying platform, a compression roller mechanism on the feeding side and a guide roller mechanism on the discharging side. The compression roller mechanism is composed of upper and lower rollers. Each side of the upper roller is provided with an annular protrusion for pressing the indentation. Each side of the lower roller is provided with an annular groove corresponding to the annular protrusion on the corresponding side. The guide roller mechanism is provided with a horizontal guide roller and two vertical guide rollers. The horizontal guide roller is located above the conveying platform, and the two vertical guide rollers are respectively located on both sides of the gap between the horizontal guide roller and the conveying platform. The method uses the above traction system to pull the inner liner pipe. When the inner liner pipe passes through the folding device, it is automatically folded into a folded state. The present application realizes the automatic folding of the inner liner pipe during the traction process, which can reduce the labor intensity and improve the work efficiency.

Description

Technical Field

[0001] This invention relates to a roller-type folding traction system and method for trenchless pipeline repair. Background Technology

[0002] Ultraviolet curing repair technology is a type of in-situ curing method. It uses a traction method to pull an inner liner tube stacked to a suitable width into the pipe to be repaired. Then, it uses ultraviolet light of a special wavelength to irradiate the pipe, so that the inner liner tube is cured and adheres tightly to the inner wall of the pipe to be repaired, thereby achieving the purpose of pipe repair. However, most commercially available lining pipes are currently stacked flat and placed inside a box, with a width significantly larger than the inner diameter of the pipe to be repaired. This requires manual folding of the lining pipe pulled from the box to a suitable width before it is pulled into the pipe through the starting manhole. This method is labor-intensive, time-consuming, and costly. Furthermore, it only allows for intermittent operation: after folding the lining pipe between the box and the starting manhole guide wheel, a winch is started to pull the folded section into the starting manhole, then the winch is stopped, the remaining lining pipe pulled from the box is folded, and then the winch is started again. This is especially problematic for large-diameter lining pipes, as the manual folding is time-consuming and significantly impacts work efficiency. Finally, it requires a sufficiently large work area between the box and the starting manhole, which increases disturbance to residents, particularly in busy urban areas. Summary of the Invention

[0003] The purpose of this invention is to realize the mechanization of on-site folding of inner lining tubes, so as to reduce labor intensity and improve work efficiency.

[0004] The technical solution of this invention is: a roller-type folding traction system for trenchless pipeline repair, comprising: A traction machine, used to pull the inner liner tube, is equipped with a traction rope for pulling the inner liner tube; The folding device, used for folding the inner liner tube, is equipped with a conveying platform. The feed side (or rear) of the conveying platform is equipped with a pressure roller mechanism, and the discharge side (or front) is equipped with a guide roller mechanism. The pressure roller mechanism is equipped with a transverse pair of rollers (transversely arranged rollers) consisting of an upper roller and a lower roller. Each side of the upper roller is equipped with an annular protrusion (radial protrusion) for pressing indentations, and each side of the lower roller is equipped with an annular groove corresponding to the annular protrusion on the corresponding side. The guide roller mechanism is equipped with a horizontal guide roller and two vertical guide rollers. The horizontal guide roller is located above the conveying platform, and the two vertical guide rollers are located on both sides of the gap between the horizontal guide roller and the conveying platform.

[0005] Preferably, a feeding mechanism is provided behind the folding mechanism.

[0006] Furthermore, the feeding mechanism is equipped with a feeding guide roller, and the inner liner tube (in a flat state) passes over the feeding guide roller (above or below, depending on the setting position of the feeding guide roller) and enters the folding mechanism.

[0007] Preferably, the conveying platform is a roller conveying platform, whose conveying surface is mainly composed of the top of several transverse rollers, allowing some areas to be fixed plates and some areas to have openings to facilitate the setting and movement of other components.

[0008] Furthermore, the upper and lower rollers are both centered in the transverse direction (the transverse centers of the upper roller, the lower roller, and the inner liner tube located between them are aligned with each other).

[0009] Preferably, the annular protrusions can be located at both ends (both ends of the circumferential surface) of the upper roller. In this case, the length of the upper roller can be considered as the width of the inner liner tube after folding.

[0010] Preferably, the length of the lower roller is not less than (preferably greater than) the length of the upper roller, for example, it can be the same width as the inner liner tube, in which case the annular groove is not located at the end of the lower roller.

[0011] Furthermore, the upper roller may or may not be equipped with a driving device; the lower roller may or may not be equipped with a driving device. When neither the upper nor the lower roller is equipped with a driving device, the upper and lower rollers can rotate due to the movement of the inner liner tube between them.

[0012] When both the upper and lower rollers are equipped with drive devices, they can use a common drive device. The common drive device drives the upper and lower rollers respectively through a transmission mechanism with two outputs, and achieves synchronous drive of the upper and lower rollers according to the required speed ratio of the upper and lower rollers. Alternatively, the upper and lower rollers can each be equipped with an independent drive device, and achieve drive of the upper and lower rollers respectively according to the required speed ratio of the two.

[0013] During operation, the upper and lower rollers rotate in opposite directions and have the same linear velocity (the linear velocity of the circumferential surface in contact with the inner liner tube), which together propel the inner liner tube forward.

[0014] Preferably, the feed end of the conveying platform is provided with adjusting guide plates. There are two adjusting guide plates, which are symmetrically arranged on both sides of the feed end of the conveying platform. The distance between the discharge ends of the two adjusting guide plates is adapted to the width of the inner liner tube (usually slightly larger than the width of the inner liner tube, so as to limit the inner liner tube located between the two from shifting left and right and not to hinder the movement of the inner liner tube), thereby adjusting or limiting the lateral position of the inner liner tube.

[0015] Preferably, the distance between the feed ends (lateral distance) of the two adjusting guide plates is greater than the distance between the discharge ends.

[0016] Preferably, both adjusting guide plates are vertical curved surfaces that expand outward from the rear end (the intersection with the horizontal plane is a curve or a broken line), and are arranged symmetrically to each other.

[0017] Preferably, the upper end of the vertical guide roller is not lower than the bottom of the horizontal guide roller, and the lower end of the vertical guide roller is not higher than the conveying surface of the conveying platform.

[0018] Furthermore, the folding device may or may not have a folding roller mechanism. The folding roller mechanism is located between the pressure roller mechanism and the guide roller mechanism, and has two upper folding rollers and / or two inner folding rollers. The two upper folding rollers are symmetrically distributed on the left and right and are set in an outward tilting manner at the top. The two inner folding rollers are symmetrically distributed on the left and right and are set in an inward tilting manner at the top.

[0019] Preferably, the lower end of the upper folding roller is not higher than the conveying surface of the conveying platform.

[0020] Preferably, when the folding roller mechanism has both an upper folding roller and an inner folding roller, the inner folding roller is set at a higher height than the upper folding roller.

[0021] Preferably, when the folding roller mechanism has both an upper folding roller and an inner folding roller, the inner folding roller is located behind the upper folding roller.

[0022] Preferably, when the folding roller mechanism has both an upper folding roller and an inner folding roller, the lower end of the inner folding roller is not higher than the upper end of the upper folding roller.

[0023] Preferably, each roller (guide roller, pressure roller, folding roller, and cylinder, etc.) adopts a hollow structure.

[0024] The roller folding traction method for trenchless pipeline repair employs any of the roller folding traction systems disclosed in this invention to traction the inner liner. The inner liner passes through the folding mechanism before entering the pipeline to be repaired, and under the action of the folding mechanism, it achieves folding deformation (deformation from a flat state to a folded state) to form a folded state.

[0025] Furthermore, when the folding device is equipped with a folding roller mechanism, when the inner liner tube passes through the folding roller mechanism (when it passes through the longitudinal position where the folding roller mechanism is located), it passes between the corresponding folding rollers of the folding roller mechanism (for example, two corresponding upper folding rollers and two corresponding inner folding rollers). The two sides of the inner liner tube are guided and constrained by the folding rollers (upper folding rollers and / or inner folding rollers) to bend upward and inward, so as to facilitate the deformation from the flat state to the folded state.

[0026] The beneficial effects of this invention are as follows: During the folding process, the inner liner tube changes from a flat state to a folded state under the coordinated action of the pressure roller mechanism and the guide roller mechanism (and the folding roller mechanism, if provided), realizing the automatic folding of the inner liner tube and allowing continuous traction until it is fully tractioned. This significantly improves work efficiency, reduces labor intensity, and also helps to reduce the working area and minimizes interference with the surrounding community. Because the feed end is equipped with rollers, an indentation is formed at the folding part by the pressing of the annular protrusion and annular groove between the upper and lower rollers. During subsequent folding, the inner liner tube will bend at the indentation, which not only facilitates folding but also ensures the accuracy of the folding position and improves the folding quality. Furthermore, when the upper roller and / or the lower roller are equipped with a drive device, the traction force requirement can be effectively reduced, thereby reducing the tensile deformation of the inner liner tube caused by the traction force, which is beneficial to ensuring the quality of subsequent engineering. Attached Figure Description

[0027] Figure 1 This is a schematic diagram (side view) of the structure of a folding device according to the present invention. Figure 2 This is a schematic diagram (side view) of another embodiment of the folding device that relates to the present invention. Figure 3 This is a schematic diagram (AA view) of the structure of the pressure roller mechanism of the present invention. Figure 4 This is a partially enlarged structural schematic diagram of the pressure roller mechanism of the present invention; Figure 5 This invention relates to a schematic diagram (BB view) of the guide roller mechanism. Figure 6 This is a schematic diagram (CC view) of the structure of the folding roller mechanism (and pressure roller mechanism) of the present invention.

[0028] Reference numerals: 1. Inner liner tube; 2. Stacked inner liner tubes; 3. Indentation; 4. Feeding guide roller; 5. Adjusting guide plate; 6. Conveying platform; 7. Horizontal roller; 8. Box; 9. Changing guide roller; 11. Upper roller; 12. Annular protrusion; 16. Lower roller; 17. Annular groove; 21. Horizontal guide roller; 23. Vertical guide roller; 31. Upper folding roller; 33. Inner folding roller. Detailed Implementation

[0029] See Figures 1 to 6 This roller-type folding traction system for pipe repair consists of a feeding mechanism, a folding device, a traction machine, and other auxiliary facilities. The traction machine and feeding mechanism can both utilize existing technologies. The feeding mechanism (if present) may include a feeding guide roller 4. The inner lining tubes (in a flat state) 1 pulled from the stacked inner lining tubes 2 pass over the feeding guide roller (typically, the feeding guide roller can be positioned high, with the inner lining tube passing over its upper side; see [reference]). Figure 1(Example) Moving forward in a continuously flat state, the inner liner stack can be placed in box 8, with the top (and front, where appropriate) of the box opened, or the inner liner stack placed on a pallet, platform, or trailer (e.g., flatbed trailer) or any suitable location. The feeding guide roller is horizontally positioned, typically higher than the inner liner stack (high-position setting), allowing the inner liner to pass over the feeding guide rail. The feeding guide roller can be a single roller, or, if necessary, multiple feeding guide rollers positioned front and rear, or a pair of rollers positioned vertically; when using a pair of rollers, the inner liner can pass through the gap between the rollers. Supports can be provided at both ends of the feeding guide roller, with the feeding guide rail rotatably mounted on the corresponding supports via bearings. The folding mechanism is located in front of the feeding mechanism, and its feed end is typically lower than the feeding guide roller (when the feeding guide roller is high-positioned), from which the inner liner stack is positioned.

[0030] The traction machine is used to pull (drag) the liner pipe (or other similar object to be pulled, hereinafter the same) used for pipeline repair. The liner pipe can be made of UV-curable material. During use, the traction rope of the traction machine is fixedly connected to the front end (or traction end) of the liner pipe (or other object to be pulled) 1 via a connector (e.g., a clamp assembly secured with bolts). After starting the traction machine, the liner pipe is pulled by the traction rope until it is dragged into the pipeline to be repaired and positioned appropriately for subsequent UV curing. Any suitable traction machine capable of setting up a traction rope, such as a winch, can be used. The traction machine can be fixedly set on the ground next to the construction end well, the loading mechanism can be set on the ground next to the construction start well, and the folding device can be set on the side of the loading mechanism near the construction start well. After being folded by the folding device, the liner pipe enters the pipeline to be repaired through the start well. Depending on the actual situation, guide rollers 9 can be installed at the bending points (points where the direction is changed) and other required locations on the trajectory of the inner liner tube (and traction rope) to achieve the bending of the trajectory.

[0031] The folding device is used to fold the inner lining tube (in its flat state). Its conveying platform 6 is located in front of the feeding mechanism (with the direction of movement of the inner lining tube as the front and the opposite direction as the rear). The conveying platform is equipped with a pressure roller mechanism and a guide roller mechanism. The pressure roller mechanism is located on the feeding side (or rear) of the conveying platform and includes an upper roller 11 and a lower roller 16 located below the upper roller. The distance between the upper and lower rollers can be set according to the thickness of the inner lining tube in its flat state, allowing the inner lining tube to pass between the rollers and make moderate pressure contact with them. This allows the rotation of the upper and lower rollers to generate a certain pushing force on the inner lining tube. However, the gap should be controlled to avoid excessive compression that could negatively impact the inner lining tube. The gap between the annular protrusion 12 and the annular groove 17 should generally be slightly smaller than the gap between the upper and lower roller bodies (cylindrical bodies) to form an effective indentation 3 similar to a crease. Based on the same or similar mechanism as the crease, the crease makes it easy to bend, so the final folding position of the inner liner tube is the crease position. By appropriately controlling the gap between the annular protrusion and the annular groove, the folding requirements are met while avoiding damage to the inner liner tube.

[0032] If necessary, the upper roller can be raised and lowered (vertically adjustable) according to existing technology, and an upper roller lifting mechanism can be set up to adjust the distance between the upper and lower rollers according to actual needs.

[0033] Both the upper and lower rollers are centrally located (the transverse centers of the upper and lower rollers are aligned with the transverse center of the inner liner tube in its flat state). Annular protrusions are located at both ends (both circumferential ends) of the upper roller. Therefore, the length of the upper roller can be considered the width of the folded inner liner tube. The length of the lower roller can typically be greater than the length of the upper roller, for example, the same as the width of the inner liner tube, to facilitate the movement of the inner liner tube. The main bodies of both the upper and lower rollers can be cylindrical. The top height of the lower roller can be the same as the surface of the conveying platform (conveyor surface). The radius of the upper roller and the height of its shaft should not obstruct the tilting of the inner liner tube's sides. The radii of the upper and lower rollers can be different or the same. When their radii are different and each is equipped with a drive device (e.g., a geared motor, pneumatic motor, hydraulic motor, etc.), different speeds can be used to ensure that their linear velocities (circumferential linear velocities) are the same. When using the same drive device, the requirement for consistent linear velocities can also be achieved by appropriately selecting the speed ratio between the two outputs of the transmission mechanism.

[0034] The guide roller mechanism is located on the discharge side (or front) of the conveying platform. It is equipped with a horizontal guide roller 21 and two vertical guide rollers 23. The horizontal guide roller is located above the conveying platform (the conveying platform below it). The two vertical guide rollers are located on both sides of the gap between the horizontal guide roller and the conveying platform. The distance between the two vertical guide rollers can be set according to the width of the inner liner tube in the folded state (usually slightly larger, so as to leave an appropriate gap for operation) to allow the inner liner tube in the folded state to pass between the two vertical guide rollers. The guide rollers guide and constrain the trajectory (lateral position) of the subsequent inner liner tube.

[0035] In the guide roller mechanism, the upper end of the vertical guide roller can be no lower than the bottom (lower edge of the circumference) of the horizontal guide roller, and the lower end of the vertical guide roller can be no higher than the conveying surface (upper surface) of the conveying platform. This ensures that there is no gap between the vertical guide roller and the horizontal guide roller, and no gap between the vertical guide roller and the conveying platform, which is beneficial for on-site operations.

[0036] A smooth transition (e.g., a rounded transition) can be made between the circumferential surface (side surface) or the annular raised surface (when the annular raised surface is located at the end of the circumferential surface of the upper roller) and the end face of the upper roller, so that no sharp corners appear at the transition / connection points to avoid damage to the inner liner tube due to the presence of sharp corners.

[0037] Depending on actual needs, the folding device may be equipped with a folding roller mechanism (or, if appropriate, without). The folding roller mechanism has two upper folding rollers 31 and / or two inner folding rollers 32. The two upper folding rollers are symmetrically distributed left and right, and are set in an inclined manner with the upper ends facing outward (the outer side of each roller), so that the area (cross-section) between the two rollers is an isosceles trapezoid with a larger upper end and a smaller lower end. The folding roller mechanism is located behind the pressure roller mechanism or aligned with the upper roller in the longitudinal direction (the longitudinal position is the same). The two upper folding rollers are located on the left and right sides of the upper roller (in the transverse direction), and there is a gap between them (in the transverse direction).

[0038] The lower end of the upper folding roller may not be higher than the conveying surface (upper surface) of the conveying platform, thus ensuring that there is no gap between the upper folding roller and the conveying platform in the vertical direction, which is beneficial for on-site operations.

[0039] The spacing between the upper folding rollers and the tilt angle of the upper folding rollers are set according to actual needs so that, under the guidance and constraint of the upper folding rollers, the two sides of the inner liner tube can bend upwards, and the degree of bending meets the requirement that the inner liner tube gradually bends and folds from the pressure roller mechanism to the guide roller mechanism to the folded state.

[0040] The inner folding rollers are set with their upper ends tilted inward (towards their respective transverse inner sides), so that the area between them is an isosceles trapezoid with a smaller upper end and a larger lower end.

[0041] The spacing between the inner folding rollers and the tilt angle of the inner folding rollers are set according to actual needs so that, under the guidance and constraint of the inner folding rollers, the two sides of the inner liner tube can bend inward, and the degree of bending meets the requirement that the inner liner tube gradually bends and folds from the pressure roller mechanism to the guide roller mechanism to the folded state.

[0042] When both upper and inner folding rollers are installed, the inner folding roller is usually positioned higher than the upper folding roller (vertically, the inner folding roller or its main part is located above the upper folding roller). The inner folding roller can be positioned behind the upper folding roller to facilitate the installation of both rollers and to meet the requirements of gradual deformation of the inner lining tube.

[0043] The lower end of the inner folding roller can be no higher than the upper end of the upper folding roller, so that there is no gap between the inner folding roller and the upper folding roller in the vertical direction, and there is also no gap between the inner folding roller and the upper folding roller on the same side (left or right side) in the horizontal direction, so as to facilitate the smooth bending of the inner lining tube.

[0044] The number of folding roller mechanisms can be set according to actual needs, for example, 0 (no folding roller mechanism), 1, 2, or 3. When multiple folding roller mechanisms are set, from back to front, the inclination angle (angle with the horizontal plane) of the upper folding roller in each folding roller mechanism gradually increases, and the inclination angle (angle with the vertical line) of the inner folding roller gradually increases. The specific type of guide roller set in each folding roller mechanism can be selected according to actual needs. For example, when there are three folding roller mechanisms, from back to front, the first folding roller mechanism only has an upper folding roller (no inner folding roller; the upper folding roller supports and constrains the part of the inner liner tube folded upwards on the corresponding side), and the inclination angle of the upper folding roller is about 30 degrees. The second folding roller mechanism has an upper folding roller and an inner folding roller; the inclination angle of the upper folding roller is about 60 degrees, and the inclination angle of the inner folding roller is about 30 degrees. The third guide roller mechanism has an upper folding roller and an inner folding roller; the inclination angle of the upper folding roller is about 90 degrees, and the inclination angle of the inner folding roller is about 60 degrees. The placement of each folding roller mechanism (the longitudinal position of its upper and / or inner folding rollers) should be set according to actual needs to facilitate the gradual deformation of the inner liner tube from a flat state to a folded state through guidance and constraint at these positions. For example, a simulation model or physical model (modeling experimental results) of the inner liner tube deformation can be drawn, showing a continuous / gradual transition from the flat state of the pressure roller mechanism to the folded state of the guide roller mechanism. Depending on the number of folding roller mechanisms, they can be placed at equal or unequal intervals between the pressure roller mechanism and the guide roller mechanism. Between the roller mechanisms, the upper and inner folding rollers (specifically set according to actual conditions) are positioned outside the bent / folded portions of the inner liner tube at their respective locations. This applies appropriate compression to the bent portions of the inner liner tube corresponding to the guide rollers. The positions (lateral and vertical) and lengths (axial dimensions of the guide rollers themselves) of each guide roller (upper and inner folding rollers) are set according to actual needs to accommodate the bending requirements of the inner liner tube at the corresponding positions (longitudinal positions), effectively supporting, guiding, and constraining the required deformation of the inner liner tube. The presence and number of folding roller mechanisms can be determined based on the specific characteristics of the inner liner tube, and the necessity and economic efficiency of setting up folding roller mechanisms can be determined experimentally.

[0045] The adjusting guide plate 5 is set on both sides of the feed end of the conveyor platform. It adopts a vertical curved shape and extends longitudinally with a certain curvature. The inlet width (the lateral distance between the two adjusting guide plates at the inlet end / rear end) is greater than the outlet width (the lateral distance between the two adjusting guide plates at the outlet end / front end) to facilitate the feeding of the end of the inner liner tube from the inlet end between the two adjusting guide plates. The outlet width matches the width of the inner liner tube, and there is a straight section of equal width on the outlet side. During the traction process, the inner liner tube moves longitudinally in a straight line under the constraint of this straight section to achieve the purpose of position adjustment.

[0046] Each roller in the folding device can be hollow, for example, in the form of a roller.

[0047] Each roller can be rotatably connected to the frame (e.g., the planar frame and support of the conveyor platform) by bearings or other suitable means. According to the specific position of the guide roller (and other rollers, where appropriate, the same below), corresponding guide roller supports and guide roller mounting structures can be set on the frame to mount the two ends of the guide roller on their respective guide roller supports or guide roller mounting structures by bearings, thereby realizing the rotatable connection of each guide roller on the frame.

[0048] If necessary, the connection between the bearing housing used to install the guide roller bearing and the frame (e.g., a guide roller bracket fixedly connected to the frame body or a guide roller mounting structure installed on the frame body) can be configured as a movable connection (e.g., a rotating connection and / or a sliding connection), and a locking mechanism can be provided to fix the bearing housing in place, so that the position and angle of the bearings at both ends of the guide roller can be adjusted according to actual needs, thereby realizing the adjustment of the position and angle of the guide roller. Since the movement of the bearings and bearing housings at both ends of the same guide roller is limited by the rigidity of the guide roller, the movement mode (including trajectory) of the bearing housings at both ends of the same guide roller should be coordinated with each other. When designing related movable connections, the rigidity of the guide roller should be taken as a constraint.

[0049] The conveying platform can be a roller conveyor platform, especially a non-powered roller conveyor platform. Its conveying surface (the surface that contacts and supports the conveyed object) is composed of the top (upper edge of the circumference) of several transverse rollers 7 to reduce the frictional resistance of the conveying platform to the conveyed object. For example, a flat frame can be set up as the frame of the conveying platform, and the two ends of each roller on the conveying platform can be rotatably connected (e.g., by bearing connection) to the two side frames of the flat frame. The top of the roller can be slightly higher than the top surface of the flat frame to facilitate on-site operation.

[0050] The transverse rollers can be set at equal intervals, but if other parts need to be set in the corresponding parts, rollers that hinder other parts (the setting and operation of other parts) can be omitted (not set). That is, a hole can be left on the conveying platform for other related parts, or part of the platform area can be set as a flat plate, with the surface of the flat plate as its transmission surface.

[0051] Based on the flexibility of the inner liner (or other folded material), the distance between the various mechanisms of the folding device is set according to the characteristics of the inner liner, so that the inner liner can form the required deformation in the folding device without significantly increasing the difficulty of operation or affecting the performance of the inner liner due to excessive stretching.

[0052] The roller-type folding traction method of the present invention mainly achieves automatic folding of the inner liner tube during the traction process through a folding device, so that the inner liner tube sent into the pipe to be repaired is in a folded state. It can be folded into three layers or two layers (for example, the folded parts on both sides are joined together in the same layer). Any of the roller-type folding traction systems disclosed in the present invention can be used to traction the inner liner tube. The inner liner tube pulled out from the stack of inner liner tubes passes through the folding device according to the set deformation mode (set posture), and is sent out from the folding device in the folded state (in the set folded state). Specifically, the inner liner tube passes through the gap between the upper roller and the conveying platform in a flat manner. Between the pressure roller mechanism and the guide roller mechanism, the two sides of the inner liner tube gradually fold upward and inward, gradually transitioning to a folded state, and passes through the gap between the horizontal guide roller, the left vertical guide roller, the right vertical guide roller and the conveying platform in the folded state.

[0053] The outer end of the traction rope is fixedly connected to the end of the inner liner tube (which may be called the traction end or front end) that passes through the folding device. The traction machine is started to pull the inner liner tube to move until the inner liner tube is pulled into place.

[0054] When the folding device is equipped with a folding roller mechanism, the inner liner tube passes between the two upper folding rollers and / or between the two inner folding rollers. The two sides of the inner liner tube are guided and constrained by the upper folding rollers and / or the inner folding rollers, bending upward and inward.

[0055] At the start of construction, the inner liner tube can be pulled out from the stack of inner liner tubes manually or by the traction rope of the traction machine. The inner liner tube pulled out from the stack is in a flat state. After passing around the feeding guide roller, the inner liner tube enters the folding mechanism (if a feeding mechanism or feeding guide roller is provided) or directly enters the folding mechanism (if a feeding mechanism or feeding guide roller is not provided). The inner liner tube entering the folding mechanism passes through the gap between the upper roller and the lower roller (if appropriate, the drive device of the upper roller and / or the lower roller can be activated to drive the inner liner tube forward through the upper and lower rollers). Before passing the inner liner tube through the second guide rail mechanism, the two sides of the front part of the inner liner tube are folded from top to bottom into a folded shape that meets the requirements. Then, it passes between the two vertical guide rollers below the horizontal guide roller. The front end of the folded inner liner tube that has passed through the guide roller mechanism is fixedly connected to the traction rope by a connector (e.g., a clamp assembly). The traction machine can then be started for traction. Due to the characteristics of the inner liner tube (e.g., elastic and flexural properties), the inner liner tube has a certain curved bulge and elasticity at the bending parts (including both ends in the flat state). The bending parts are smooth curved surfaces. During the traction movement, the inner liner tube located between the pressure roller mechanism and the guide roller mechanism can continuously maintain the changing state of gradually folding into place, and the two side edges will not collide or jam when they cross and overlap. The bottom of the inner liner tube slides on the conveyor platform. Thus, after the initial manual arrangement, continuous traction is allowed. During the continuous traction process, the inner liner tube can be automatically folded by the folding device.

[0056] The flat state of the inner liner tube as referred to in this invention is the flat state after the tube hole of the inner liner tube has basically disappeared, and the folded state of the inner liner tube is the state formed by folding laterally on the basis of the flat state.

[0057] Unless otherwise specified, the preferred and optional technical means disclosed in this invention can be arbitrarily combined to form several different specific embodiments when one preferred or optional technical means is a further limitation of another technical means.

Claims

1. A roller-type folding traction system for trenchless pipe repair, comprising: A traction machine, used to pull the inner liner tube, is equipped with a traction rope for pulling the inner liner tube; Its characteristic is that it further includes: A folding device for folding inner lining tubes includes a conveying platform. The infeed side of the conveying platform has a pressure roller mechanism, and the discharge side has a guide roller mechanism. The pressure roller mechanism consists of a transverse pair of rollers, an upper roller and a lower roller. Each side of the upper roller has an annular protrusion for pressing indentations, and each side of the lower roller has an annular groove corresponding to the corresponding annular protrusion. The guide roller mechanism includes a horizontal guide roller and two vertical guide rollers. The horizontal guide roller is located above the conveying platform, and the two vertical guide rollers are located on either side of the gap between the horizontal guide roller and the conveying platform. The upper and lower rollers are centered transversely. The device has annular protrusions at both ends of the upper roller, and the length of the lower roller is not less than the length of the upper roller. The folding device has multiple folding roller mechanisms, which are located between the pressure roller mechanism and the guide roller mechanism. There are two upper folding rollers and two inner folding rollers. The inner folding rollers are set at a higher height than the upper folding rollers. The two upper folding rollers are symmetrically distributed on the left and right, and are set with the upper end inclined outward. The two inner folding rollers are symmetrically distributed on the left and right, and are set with the upper end inclined inward. From back to front, the angle between the upper folding rollers of each folding roller mechanism and the horizontal plane gradually increases, and the angle between the inner folding rollers and the vertical line gradually increases.

2. The roller-type folding traction system as described in claim 1, characterized in that... The conveying platform is a roller conveying platform, and its conveying surface is mainly composed of the tops of several transverse rollers.

3. The roller-type folding traction system as described in claim 1, characterized in that... The upper roller may or may not have a drive device, and the lower roller may or may not have a drive device.

4. The roller folding traction system as described in claim 1, characterized in that... The feed end of the conveyor platform is equipped with two adjusting guide plates, which are symmetrically arranged on both sides of the feed end of the conveyor platform.

5. The roller-type folding traction system as described in claim 1, characterized in that... In the guide roller mechanism, the upper end of the vertical guide roller is not lower than the bottom of the horizontal guide roller, and the lower end of the vertical guide roller is not higher than the conveying surface of the conveying platform.

6. A roller-type folding traction method for trenchless pipeline repair, characterized in that... The inner liner tube is pulled by the roller folding traction system according to any one of claims 1-5. The inner liner tube passes through the folding mechanism before entering the pipe to be repaired, and is folded and deformed under the action of the folding mechanism to form a folded state.

7. The roller folding traction method as described in claim 6, characterized in that... When the folding device is equipped with a folding roller mechanism, the inner liner tube passes between the corresponding folding rollers of the folding roller mechanism, and the two sides of the inner liner tube are guided and constrained by the folding rollers to bend upward and inward.

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