Method for measuring the feed length of a strip-shaped material, and method and system for controlling the feed length of a strip-shaped material

Abstract

To smoothly carry out pipe manufacturing work for rehabilitation pipes while reducing the monitoring burden on workers. [Solution] The belt-shaped member 6 is wound and fed from the drum 6 toward the pipe making machine 10, which produces a rehabilitated pipe 4 and rehabilitates the existing pipe 1. The control system includes a weight sensor 45 that detects the weight of the drum 6 and the support device 7 that supports the drum 6, a calculation and control unit 40, and a display unit 41. The calculation and control unit 40 calculates the decrease in weight of the drum 6 based on the weight detected by the weight sensor 45, and calculates the actual feed length of the belt-shaped member 5 from this weight decrease. The calculation and control unit 40 determines a target feed length of the belt-shaped member 5 based on at least information about the length of the belt-shaped member 5 produced by the pipe making machine 10, calculates the deviation between the target feed length and the actual feed length, and controls the rotation of the drum 6 based on this deviation to bring the actual feed length closer to the target feed length.

Description

[Technical Field]

[0001] The present invention relates to a method for measuring the feed length of a strip-shaped material from a drum on which the strip-shaped material is wound in layers in order to properly control the feed length during the process of manufacturing a rehabilitated pipe for rehabilitating an existing pipe, and to a feed length control method and system using this measurement method. [Background technology]

[0002] A method for rehabilitating an existing pipe, such as an aging sewer pipe, by lining it with a rehabilitation pipe made by spirally winding a strip-shaped material around the inner periphery of the existing pipe is well known. Specifically, as disclosed in Patent Documents 1 and 2, a drum made of overlapping strip-shaped material is placed on the ground near a manhole, and the strip-shaped material is pulled out from the drum and sent through the manhole to a pipe-making machine inside the existing pipe, where it is spirally wound and adjacent side edges are joined together with a one-turn offset to produce a rehabilitation pipe.

[0003] The strip-shaped member may be manually fed from the drum, or may be manually fed while the drum is rotated by a drive device, or may be fed by a drive device installed inside the drum.

[0004] In order to stably produce a strip-shaped material in a pipe-making machine, the strip-shaped material needs to be fed into the machine in a spiral with an appropriate pitch, and it is necessary to feed the strip-shaped material from the drum at a length that corresponds to the length of the strip-shaped material to be produced. For this reason, multiple workers visually monitor the condition of the strip-shaped material from the drum to the pipe-making machine and adjust the feed length of the strip-shaped material from the drum. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-320726 [Patent Document 2] Japanese Patent Application Publication No. 2024-72622 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, it is necessary to properly adjust the feed length of the strip-shaped material without relying on the visual observation and experience of an operator. To do this, it is necessary to accurately measure the feed length of the strip-shaped material, but because the strip-shaped material is fed in a spiral, it is not possible to measure the length of the strip-shaped material directly. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, a first aspect of the present invention is a method for measuring the feed length of a strip-shaped member from a drum formed by winding the strip-shaped member in layers, feeding the strip-shaped member from a drum toward a pipe making machine, joining adjacent side edge portions of the strip-shaped member that are offset by one circumference in the pipe making machine to make a rehabilitated pipe consisting of a spiral pipe, and lining the inner periphery of an existing pipe with this rehabilitating pipe, comprising: The weight of the drum and the support device that supports the drum is detected by a weight sensor, the decrease in weight of the drum is calculated based on the weight detected by the weight sensor, and information on the feed length of the strip-shaped material from the drum is obtained based on the decrease in weight. According to this method, the feed length of the strip-shaped material from the drum can be measured without directly contacting the strip-shaped material.

[0008] Preferably, the support device includes a support base, a plurality of weight sensors are installed on the underside of the support base, and the reduction in weight of the drum is calculated from the sum of the weights detected by the plurality of weight sensors. This method allows accurate measurement of the weight loss of the drum.

[0009] A second aspect of the present invention is a method for controlling the feed length of a strip-shaped member from a drum formed by winding the strip-shaped member on itself, feeding the strip-shaped member from a drum toward a pipe making machine, joining adjacent side edge portions of the strip-shaped member that are offset by one circumference in the pipe making machine to make a rehabilitated pipe consisting of a spiral pipe, and lining the inner periphery of an existing pipe with this rehabilitating pipe, the method comprising: The weight of the drum and the support device supporting the drum is detected by a weight sensor, the reduction in weight of the drum is calculated based on the weight detected by the weight sensor, information on the feed length of the strip-shaped member from the drum is obtained based on the reduction in weight, and the feed length of the strip-shaped member from the drum is controlled so that it corresponds to the pipe length of the strip-shaped member produced by the pipe making machine. According to this method, by setting the feed length of the strip-shaped material from the drum, calculated based on the weight reduction of the drum, to a length corresponding to the pipe-making length of the strip-shaped material, the spiral state of the strip-shaped material supplied to the pipe-making machine can be maintained near-optimal, allowing for stable and smooth pipe-making, and reducing or eliminating the burden on workers of monitoring the strip-shaped material supplied to the pipe-making machine.

[0010] A third aspect of the present invention is a system for controlling the feed length of the strip-shaped member from the drum in a process of feeding the strip-shaped member from a drum on which the strip-shaped member is wound and stacked, toward a pipe making machine, and manufacturing a rehabilitated pipe consisting of a spiral pipe by joining adjacent side edge portions of the strip-shaped member that are offset by one circumference in the pipe making machine, and lining the inner circumference of an existing pipe with this rehabilitating pipe, wherein: The apparatus is characterized by comprising a weight sensor that detects the weight of the drum and the support device that supports the drum, an arithmetic and control unit that calculates the decrease in weight of the drum based on the weight detected by the weight sensor, calculates the actual feed length of the strip-shaped member from the decrease in weight, determines a target feed length of the strip-shaped member based on information on at least the pipe production length of the strip-shaped member produced by the pipe production machine, and calculates information regarding the deviation between the target feed length and the actual feed length, and a display unit that displays information regarding the deviation between the target feed length and the actual feed length from the arithmetic and control unit. According to this system, by displaying information on the deviation between the feed length of the strip-shaped material from the drum calculated based on the weight loss of the drum and the target feed length based on the pipe-making length of the strip-shaped material on a display device, the operator can be prompted to control the feed length of the strip-shaped material from the drum to eliminate the deviation. As a result, the spiral state of the strip-shaped material supplied to the pipe-making machine can be maintained close to optimal, pipe-making can be carried out stably and smoothly, and the burden on the operator of monitoring the strip-shaped material supplied to the pipe-making machine can be reduced or eliminated.

[0011] A fourth aspect of the present invention is a system for controlling the feed length of a strip-shaped member from a drum formed by winding the strip-shaped member on itself, feeding the strip-shaped member from a drum toward a pipe making machine, joining adjacent side edge portions of the strip-shaped member that are offset by one circumference in the pipe making machine to make a rehabilitated pipe consisting of a spiral pipe, and lining the inner periphery of an existing pipe with this rehabilitating pipe, wherein the system: The machine is equipped with a weight sensor that detects the weight of the drum and the support device that supports the drum, an arithmetic and control unit that calculates the decrease in weight of the drum based on the weight detected by the weight sensor, calculates the actual feed length of the strip-shaped member from the decrease in weight, determines a target feed length of the strip-shaped member based on information on at least the pipe length of the strip-shaped member produced by pipe production in the pipe making machine, and calculates information on the deviation between the target feed length and the actual feed length, and a drive unit that performs feeding of the strip-shaped member from the drum or assists manual feeding, and is characterized in that the arithmetic and control unit controls the drive unit based on information on the deviation between the target feed length and the actual feed length, thereby bringing the actual feed length closer to the target feed length. This system automatically controls the drive device that executes or assists in the feeding of the strip-shaped material based on the deviation between the feed length of the strip-shaped material from the drum, which is calculated based on the weight loss of the drum, and the target feed length, which is based on the pipe-making length of the strip-shaped material. This reduces or eliminates the burden on the worker who feeds the strip-shaped material from the drum. Other effects are the same as those of the third aspect.

[0012] In the systems of the third and fourth aspects described above, the support device comprises a circular support frame that supports the drum and a support base that supports the support frame, the weight sensor is arranged below the support base, the support base has rollers on which the outer periphery of the support frame rests, and the drive device rotates the rollers to rotate the drum.

[0013] In the systems of the third and fourth aspects described above, a rotation sensor is further provided attached to the drive motor of the pipe making machine, and the calculation / control unit calculates the pipe making length of the strip-shaped member in the pipe making machine based on the detected rotation speed from the rotation sensor.

[0014] In the systems of the third and fourth aspects described above, the pipe making machine is a self-propelled pipe making machine that moves together with the tip of the rehabilitating pipe as the rehabilitating pipe being made elongates, and the calculation and control unit calculates the target feed length La of the strip-shaped member according to the following formula: La=Lb+Lc Lb is the length of the strip-shaped member from the start of pipe production, and Lc is the length of the strip-shaped member when the strip-shaped member of the unmade pipe in the rehabilitated pipe is in a spiral shape with the optimal pitch over the extended length of the rehabilitated pipe produced. According to this configuration, when producing a strip-shaped member using a self-propelled pipe producing machine, the target feed length can be accurately calculated. [Effects of the Invention]

[0015] According to the present invention, the feed length of the strip-shaped material from the drum can be accurately measured, and the feed length of the strip from the drum can be controlled based on this feed length. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a longitudinal cross-sectional view schematically illustrating an existing pipe rehabilitation process using a belt-shaped member feed length control system according to one embodiment of the present invention. [Figure 2] 3 is a schematic diagram of the feed length control system for the belt-shaped member. FIG. [Figure 3] FIG. 2 is a top view of a support base that supports a drum of a strip-shaped material. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows an aging existing pipe 1 to be rehabilitated. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground, but it may also be a water supply pipe, agricultural water pipe, gas pipe, hydroelectric power generation water pipe, tunnel, etc. One end of the existing pipe 1 is connected to a starting manhole 2, and the other end is connected to a destination manhole 3.

[0018] An existing pipe 1 is rehabilitated by lining its inner periphery with a rehabilitation pipe 4 made of a spiral pipe. The rehabilitation pipe 4 is manufactured by spirally winding a strip-shaped member 5 (Proafil) and mating (joining) the side edges of two strip-shaped members 5 that are one turn apart. The strip-shaped member 5 in this embodiment is made of a synthetic resin such as polyvinyl chloride (PVC) or polyolefin, and may incorporate a metal reinforcing material as needed.

[0019] <Rehabilitation pipe manufacturing process> A cylindrical drum 6, on which a strip-shaped material 5 is wound axially and radially, is installed on the ground near the starting manhole 2 and supported by a support device 7. The strip-shaped material 5 is pulled out from the inner circumference of this drum 6 and supplied to a self-propelled pipe making machine 10 inside the existing pipe 1 through the starting manhole 2. The strip-shaped material 5 is supplied to the pipe making machine 10 while drawing a spiral due to the tendency of the drum 6 to wind it.

[0020] Self-propelled pipe making machines 10 are well known, so to briefly explain, a supplied strip-shaped member 5 is fed by a drive roller onto the tip of a rehabilitating pipe 4 that is in the process of being made, and the pipe is made by fitting together the side edges of the fed strip-shaped member 5 and the strip-shaped member 5 at the tip of the rehabilitating pipe 4, i.e., the side edges of adjacent strip-shaped members 5 that are offset by one circumference. The pipe making machine 10 travels along the spiral of the strip-shaped member 5 at the tip of the rehabilitating pipe 4 due to the reaction force generated when the strip-shaped member 5 is fed in. As a result, the rehabilitating pipe 4 extends toward the arrival manhole 3 as the pipe is made, and the pipe making machine 10 moves toward the arrival manhole 3 together with the tip of the rehabilitating pipe 4.

[0021] A mobile hydraulic unit 11 is located closer to the destination manhole 3 than the pipe making machine 10. This hydraulic unit 11 supplies hydraulic pressure generated by electricity from a power supply unit 12 located on the ground near the destination manhole 3 to a hydraulic motor (drive motor) that drives the drive roller of the pipe making machine 10.

[0022] <Drum support device> As shown in FIGS. 1 and 2, the support device 7 that supports the drum 6 has a support frame 20 that directly supports the drum 6, and a support base 30 that rotatably supports the support frame 20.

[0023] The support frame 20 has a pair of circular frame halves 21 each having an opening 21a in the center, and a restricting means (not shown) that spans these frame halves 21 and restricts the outer periphery of the drum 6. Each frame half 21 has an outer ring 22, an inner ring 23, and radial rods 24 that connect these rings 22, 23. The belt-shaped member 5 is pulled out from the inner periphery of the drum 6 through an opening 21 a in the support frame 20 .

[0024] 2 and 3, the support base 30 includes a rectangular flat plate 31, elongated roller support members 32 fixed parallel to the upper surface of the flat plate 31, and two rollers 33 rotatably supported by each roller support member 32. The two rollers 33 of each roller support member 32 are adapted to receive the outer rings 22 (the outer periphery of the support frame 20) of each frame half 21 of the support frame 20.

[0025] Of the four rollers 33, for example, the roller 33 at the bottom right in Fig. 3 is connected to a roller drive motor 35 (drive device) and serves as a drive roller. The other rollers 33 serve as driven rollers. Note that multiple rollers 33 may be used as drive rollers.

[0026] <Belt-shaped material feeding process> As described above, when the pipe making process is being carried out, the roller drive motor 35 is continuously driven, and the rotation of the rollers 33 slowly rotates the support frame 7 and the drum 6. This rotation of the drum 6 causes the strip-shaped material 5 to separate from the inner circumference of the drum 6. As the drum 6 rotates, workers remove the strip-shaped material 5 from the drum 6 one roll at a time and send it to the source manhole 2.

[0027] <Feed length control system for belt-shaped materials> In order to stably and smoothly produce the strip-shaped member 5 in the pipe making machine 10, it is necessary to keep the spiral pitch of the strip-shaped member 5 that passes through the rehabilitating pipe 4 and reaches the pipe making machine 10 within a predetermined range. To achieve this, it is necessary to control the feed length (feed amount) of the strip-shaped member 5 sent out from the drum 6 so that it corresponds to the length of the strip-shaped member 5 to be produced. To meet this requirement, this embodiment is equipped with a feed length control system for the strip-shaped member 5 shown in Figures 2 and 3.

[0028] The feed length control system includes a rotation sensor 15 (rotary encoder) attached to the hydraulic motor (drive motor) of the pipe making machine 10 to detect the rotation speed of the hydraulic motor, weight sensors 45 (load cells) installed at the four corners of the horizontal and flat underside of the flat plate 31 of the support table 30, an arithmetic and control device 40 (arithmetic and control unit), and a display device 41 (display unit).

[0029] The calculation / control device 40 calculates the target feed length La of the strip-shaped member 5 from the start of pipe production using the following formula. La = Lb + Lc (1) where Lb is the length of the strip-shaped member 5 that has been produced from the start of pipe production and has become part of the rehabilitated pipe 4. Lc is the length of the strip-shaped member 5 of the unprocessed pipe in the rehabilitated pipe 4 when it is in a spiral shape with an optimal pitch over the extension length of the rehabilitated pipe 4 produced from the start of pipe production (the distance traveled by the pipe production machine 10). When the rehabilitating pipe 4 is produced over several days, it is preferable to set the start point of pipe production for each working day. At the start point of pipe production, Lb and Lc are both zero.

[0030] The calculation and control device 40 can determine the pipe length Lb of the strip-shaped member 5 based on the rotation speed from the rotation sensor 15 attached to the hydraulic motor of the pipe making machine 10. Specifically, it can be determined by multiplying the detected rotation speed by a pre-stored constant (the pipe length of the strip-shaped member 5 per rotation).

[0031] The calculation and control device 40 can calculate the length Lc of the strip-shaped member 5 of the unprocessed pipe based on the calculated pipe processing length Lb. For example, the extension length of the rehabilitating pipe 4 is calculated by multiplying the pipe processing length Lb by a pre-stored constant (the extension amount of the rehabilitating pipe 4 per unit pipe processing length of the strip-shaped member 5). This constant is determined by the diameter of the rehabilitating pipe 4, the width of the strip-shaped member 5, etc. Furthermore, the calculation and control device 40 calculates the length Lc of the unprocessed pipe strip 5 by multiplying the calculated extension length of the rehabilitating pipe 4 by a pre-stored constant X. This constant X is the length of the unprocessed pipe strip 5 per unit extension length, determined assuming that the unprocessed pipe strip 5 will spiral at an optimal pitch (for example, assuming that it will spiral twice per meter). This constant X varies depending on the diameter of the rehabilitating pipe, the material of the strip 5, etc.

[0032] The pipe length Lb of the strip-shaped member 5 and the length Lc of the unmade pipe strip-shaped member 5 can also be calculated by other means. For example, an angle sensor is provided in the pipe making machine 10, and this angle sensor detects the number of rotations of the spiral motion accompanying pipe making by the pipe making machine 10. The pipe length Lb is calculated by multiplying this number of rotations by the diameter of the rehabilitating pipe 4, and the extended length of the rehabilitating pipe 4 is calculated by multiplying this number of rotations by the width of the rehabilitating pipe 4. Furthermore, the length Lc of the unmade pipe strip-shaped member is calculated from this extended length in the same manner as above.

[0033] The calculation and control device 40 calculates the target feed length La as described above, and also calculates the weight loss since the start of pipe production based on the sum of the detected weights from the four weight sensors 45 arranged under the support stand 30, and can calculate the actual feed length La' of the strip-shaped member 5 fed out from the drum 6 based on this weight loss. In other words, the actual feed length La' can be calculated by multiplying the sum of the detected weights by the length of the strip-shaped member 5 per unit weight (which differs for each strip-shaped member 5).

[0034] As described above, in this embodiment, since the belt-like member 5 is pulled out manually by one roll at a time, the total detected weight decreases stepwise. Further, since the belt-like member 5 forms a spiral and vibrates each time it lands from the drum 6, fluctuations occur in the total detected weight. Therefore, it is preferable to perform the weight detection once every few seconds and use the average value of the detected weights for a plurality of times, for example, 10 times, in the calculation of the feed length La'.

[0035] The arithmetic and control unit 40 performs feedback control on the roller drive motor 35 so that the actual feed length La' of the belt-like member 5 becomes the target feed length La (that is, Lb + Lc). When La' < La, the roller drive motor 35 is controlled to increase the rotation of the drum 6, and when La' > La, the rotation of the drum 6 is slowed down.

[0036] Note that the arithmetic and control unit 40 may obtain the target weight reduction from the target feed length La and perform feedback control so that the actual weight reduction based on the detected weight from the weight sensor 45 corresponds to the target weight reduction. This control is substantially equivalent to the feedback control based on the feed length of the belt-like member 5 described above.

[0037] In this embodiment, the drum 6 is rotated in conjunction with the pipe manufacturing operation in the pipe manufacturing machine 10 to prompt the operator to feed out the belt-like member 5 from the drum 6, so that the pipe manufacturing conditions can be optimally maintained, and the burden of visually monitoring the state of the belt-like member 5 in the regenerated pipe 4 can be reduced or eliminated.

[0038] The arithmetic and control unit 40 sends deviation information to the display device 41. The display device 41 displays this deviation information on the screen or by voice. The operator can confirm this deviation information.

[0039] The arithmetic and control unit 40 may be equipped with a manual operation unit. In this case, the roller drive motor 35 is not feedback-controlled as described above, and the operator manually controls the roller drive motor 35 while viewing the deviation information on the display device 41. The display device 41 may issue warnings of "overfeeding" and "delayed feeding" of the belt-like member by voice based on the deviation information.

[0040] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. The roller drive motor may be omitted. In this case, the strip is manually pulled from the drum by an operator, and the drum rotates naturally during the pulling process. The operator can control the speed at which the strip is pulled out by using the deviation information displayed on the display.

[0041] The belt-shaped material may be fed by a drive device without relying substantially on human power. For example, the drive device may feed the belt-shaped material by rotating a pair of drive rollers that sandwich the belt-shaped material. A curling device may also be used as the drive device. Control of such a drive device is similar to control of the roller drive motor 35 described above, and therefore a detailed description thereof will be omitted.

[0042] The strip-shaped member may be pulled out from the outer periphery of the drum. The pipe making machine may be a push-type machine that does not move within the rehabilitating pipe. In this case, the feed length of the strip-shaped member is controlled so that it is substantially equal to the length of the pipe to be made. [Industrial Applicability]

[0043] The present invention can be applied to a technology for rehabilitating existing pipes such as aged sewer pipes. [Explanation of symbols]

[0044] 1 Existing pipes 2 Starting manhole 3 Arrival side manhole 4 Rehabilitation pipe 5. Belt-shaped member 6 Drums 7 Support device 10 Self-propelled pipe making machine 15 Hydraulic motor rotation sensor (drive motor rotation sensor) 20 Support Frame 30 Support stand 33 Laura 35 Roller drive motor (drive unit) 40 Calculation and control device (calculation and control section) 41 Display device (display section) 45 Weight Sensor

Claims

1. A process for rehabilitating an existing pipe by feeding a strip-shaped member from a drum on which the strip-shaped member is wound and stacked toward a pipe manufacturing machine, joining adjacent side edge portions of the strip-shaped member that are offset by one circumference in the pipe manufacturing machine to manufacture a rehabilitated pipe consisting of a spiral pipe, and lining the inner periphery of the existing pipe with this rehabilitating pipe, A method for measuring the feed length of a strip-shaped material, comprising: detecting the weight of the drum and the support device supporting the drum with a weight sensor; calculating the decrease in weight of the drum based on the weight detected by the weight sensor; and obtaining information on the feed length of the strip-shaped material from the drum based on the decrease in weight.

2. The method for measuring the feed length of a strip-shaped material according to claim 1, characterized in that the support device includes a support base, a plurality of weight sensors are installed on the underside of the support base, and the reduction in weight of the drum is calculated from the sum of the detected weights of these plurality of weight sensors.

3. A method for controlling the feed length of a strip-shaped member from a drum in a process of feeding the strip-shaped member from a drum on which the strip-shaped member is wound up and stacked, toward a pipe manufacturing machine, joining adjacent side edge portions of the strip-shaped member that are offset by one circumference in the pipe manufacturing machine to manufacture a rehabilitated pipe consisting of a spiral pipe, and lining the inner periphery of an existing pipe with this rehabilitating pipe, comprising: a weight sensor for detecting the weight of the drum and the support device for supporting the drum, calculating a weight reduction of the drum based on the weight detected by the weight sensor, and obtaining information on the feed length of the strip-shaped member from the drum based on the weight reduction; A method for controlling the feed length of a strip-shaped member, characterized by controlling the feed length of the strip-shaped member from the drum so that it corresponds to the pipe length of the strip-shaped member produced by the pipe making machine.

4. A system for controlling the feed length of a strip-shaped member from a drum in a process in which the strip-shaped member is wound up and sent out from a drum toward a pipe making machine, and adjacent side edge portions of the strip-shaped member are joined together at a distance of one circumference in the pipe making machine to make a rehabilitated pipe consisting of a spiral pipe, and the inner periphery of an existing pipe is lined with this rehabilitating pipe to rehabilitate the existing pipe, comprising: a weight sensor for detecting the weight of the drum and a support device for supporting the drum; a calculation / control unit that calculates the weight reduction of the drum based on the weight detected by the weight sensor, calculates the actual feed length of the strip-shaped member from the weight reduction, determines a target feed length of the strip-shaped member based on information on at least the pipe length of the strip-shaped member produced by pipe production in the pipe making machine, and calculates information on the deviation between the target feed length and the actual feed length; a display unit that displays information about the deviation between the target feed length and the actual feed length from the calculation / control unit; A belt-shaped material feed length control system comprising:

5. A system for controlling the feed length of a strip-shaped member from a drum in a process in which the strip-shaped member is wound up and sent out from a drum toward a pipe making machine, and adjacent side edge portions of the strip-shaped member are joined together at a distance of one circumference in the pipe making machine to make a rehabilitated pipe consisting of a spiral pipe, and the inner periphery of an existing pipe is lined with this rehabilitating pipe to rehabilitate the existing pipe, comprising: a weight sensor for detecting the weight of the drum and a support device for supporting the drum; a calculation / control unit that calculates the weight reduction of the drum based on the weight detected by the weight sensor, calculates the actual feed length of the strip-shaped member from the weight reduction, determines a target feed length of the strip-shaped member based on information on at least the pipe length of the strip-shaped member produced by pipe production in the pipe making machine, and calculates information on the deviation between the target feed length and the actual feed length; a drive device for effecting or assisting manual delivery of the strip from the drum; Equipped with The feed length control system for a strip-shaped material is characterized in that the calculation / control unit controls the drive device based on information regarding the deviation between the target feed length and the actual feed length, thereby bringing the actual feed length closer to the target feed length.

6. The support device comprises a circular support frame that supports the drum and a support base that supports the support frame, the weight sensor is arranged below the support base, the support base has a roller on which the outer periphery of the support frame rests, and the drive device rotates the roller to rotate the drum, as described in claim 5.

7. Further, a rotation sensor is provided on the drive motor of the pipe making machine, A strip-shaped material feed length control system as described in claim 4 or 5, characterized in that the calculation / control unit calculates the pipe manufacturing length of the strip-shaped material in the pipe manufacturing machine based on the detected rotation speed from the rotation sensor.

8. The pipe making machine is a self-propelled pipe making machine that moves together with the tip of the rehabilitating pipe as the rehabilitating pipe being made elongates, The calculation / control unit calculates a target feed length La of the strip-shaped member according to the following formula: La = Lb + Lc A strip-shaped member feed length control system as described in claim 4 or 5, characterized in that Lb is the length of the strip-shaped member from the start of pipe production, and Lc is the length of the strip-shaped member of the unmade pipe in the rehabilitated pipe when the strip-shaped member is in a spiral shape with an optimal pitch over the extended length of the rehabilitated pipe produced.

Images