Pipe jacking machine head and tail sharpening system and method

Abstract

The invention provides a pipe jacking machine head tail sharpening system and method.The pipe jacking machine head tail sharpening system comprises at least one adjustable rack arranged at an outlet of a pipe jacking machine tool body and used for conducting segmented pressing operation on pierced billets ejected out of a pipe jacking machine; the head and tail sharpening control system is used for controlling and adjusting pressing parameters of the adjustable rack in a segmented mode, the adjustable rack conducts segmented pressing operation on the pierced billet, so that the radial outer wall of the pierced billet is subjected to hole shrinkage pre-pressing before the pierced billet enters the stretch reducing mill, and the pierced billet subjected to pressing operation by the adjustable rack is subjected to hole shrinkage pre-pressing after the pierced billet enters the stretch reducing mill. The head section and the tail section of the produced finished pipe can solve the problems of unequal wall thickness, too large wall thickness and the like to a certain extent, and the problem that the yield of the head section and the tail section of the finished pipe is low is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking machine equipment, and in particular to a pipe jacking machine head and tail sharpening system and method. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] In the technical field of pipe jacking machine equipment, the cross-roll piercing and elongation (CEP) technology is a seamless steel pipe production process proposed in this field that combines cross-roll piercing with pipe jacking extension. The pipe jacking machine is the key equipment responsible for rolling the perforated rough pipe into a rough pipe in the CPE process for rolling seamless pipes. The rough pipe rolled out by the fixed roller die of the pipe jacking machine is usually thicker, and a tension reducer (referred to as a tension reducer) is required. The tension formed by the speed difference between the frames is controlled to reduce the diameter and wall of the rough pipe in a series of hole types. In the actual production process, it is found that due to the instability of the steel biting and throwing processes during the continuous rolling process, as well as the tension effect during the tension reducing process, the head and tail of the finished pipe usually have problems such as uneven wall thickness and excessive thickness over a certain length.

[0004] In view of the above problems, in the existing process, the finished pipe is usually cooled to release the thermal stress, and then the pipe sections with different thicknesses at the head and tail are measured and cut off. However, this will result in a low yield rate of the finished pipe, and it is impossible to produce the long seamless pipes required by some factories with special needs, which also causes waste of resources and complicated processes. Therefore, the existing technical solution direction is mainly to improve the equipment of the pipe jacking machine and the tensioning and reducing machine. For example, while adopting the oblique rolling and perforation CEP technology, the CEC control technology (Competitive Evolutionary Computation, CEC) is added to achieve precise control of the wall thickness of the end of the finished pipe by adjusting the motor speed and the speed change strength coefficient, thereby improving the yield rate of the finished pipe; however, even so, the head and tail of the finished pipe still have problems such as unequal wall thickness and excessive thickness at a certain length. Because the control difficulty of the motor and the effect of tension involved in CEC control are difficult to predict, the yield rate of the CEC control technology has a control upper limit and cannot be further improved.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0006] The purpose of the present invention is to provide a head and tail sharpening system and method for a pipe jacking machine, which solves the problem of low yield rate of the head and tail parts of finished pipes.

[0007] The above-mentioned implementation objectives of the present invention are mainly achieved by the following technical solutions:

[0008] The present invention provides a pipe jacking machine head and tail sharpening system, comprising:

[0009] At least one adjustable frame arranged at the outlet of the pipe jacking machine body, used for performing segmented pressing operation on the rough pipe ejected from the pipe jacking machine;

[0010] The head and tail sharpening control system is used for segmented control and adjustment of the pressing parameters of the adjustable frame.

[0011] In a specific embodiment, the head and tail sharpening control system includes: a computing unit and a control unit;

[0012] The calculation unit is used to calculate the length of each segment and the corresponding pressing parameter, and the control unit is used to control the adjustable frame to execute the pressing parameter of each segment on the rough pipe segment.

[0013] In a specific embodiment, the adjustable frame has at least three adjustable pressure rollers, the rough pipe is ejected along the rolling center line of the pipe jacking machine, and the adjustable pressure rollers can press down in a direction close to the rolling center line according to the pressing parameters, and one end of at least three of the adjustable pressure rollers can abut the same position on the rolling center line.

[0014] In a specific embodiment, at least three adjustable pressure rollers are arranged at equal intervals along the circumference of the rolling center line.

[0015] In a specific embodiment, there are a plurality of adjustable frames, and the plurality of adjustable frames are arranged at intervals along the rolling center line, and the interval between adjacent adjustable frames is greater than the length of each of the segments.

[0016] In a specific embodiment, the adjustable pressure rollers of two adjacent adjustable frames have a rotation angle in the circumferential direction of the rolling center line.

[0017] In a specific embodiment, the rotation angle is greater than 0°, and the rotation angle is less than 120°.

[0018] In a specific embodiment, the pipe jacking machine head and tail sharpening system further includes:

[0019] A first thermal inspection piece, which is arranged on a side of the adjustable frame close to the pipe jacking machine, and the first thermal inspection piece is arranged toward the rolling center line, and is used to detect the running distance of the rough pipe;

[0020] A second thermal inspection piece is arranged on a side of the adjustable frame away from the pipe jacking machine. The second thermal inspection piece is arranged toward the rolling center line and is used to monitor the tail of the rough pipe.

[0021] The present invention also provides a method for sharpening the tip and tail of a pipe jacking machine, which is used in the pipe jacking machine tip and tail sharpening system as described above. The method for sharpening the tip and tail of a pipe jacking machine comprises:

[0022] Step S1: at least one adjustable frame is arranged at the exit of the pipe jacking machine body;

[0023] Step S2: adjusting the pressing parameters of the adjustable frame on the rough pipe by segmented control through the head and tail sharpening control system to complete the sharpening operation of the head and tail sections of the rough pipe.

[0024] In a specific embodiment, the head and tail sharpening control system includes a calculation unit and a control unit, and the step S2 includes:

[0025] Step S21: determining the segment length of the rough pipe and the corresponding pressing parameter thereof by the calculation unit;

[0026] Step S22: The control unit controls the adjustable frame to perform pressing operations on the rough pipe segments according to the lengths of the segments and the corresponding pressing parameters, thereby completing the sharpening operation of the head and tail segments of the rough pipe.

[0027] In a specific implementation, step S21 includes:

[0028] Step S211: obtaining a first size parameter of the rough pipe sample before entering the stretching and reducing machine, and a second size parameter group of the rough pipe sample after passing through the stretching and reducing machine;

[0029] Step S212: determining a simulated pre-compression action parameter group of the adjustable rack according to the first size parameter group and the second size parameter group and the flow equalization principle;

[0030] Step S213: determining a pressing parameter group of the adjustable frame according to the simulated pre-pressing action parameter group and the jacking speed of the rough pipe.

[0031] In a specific embodiment, the first size parameter includes the initial length of the rough pipe sample before entering the tensioning and reducing machine;

[0032] The second size parameter group includes the extension length of the rough pipe sample after passing through the stretching and reducing machine, and the segment lengths and segment thicknesses of a plurality of thickness segments with different inner wall thicknesses formed by the rough pipe sample after passing through the stretching and reducing machine;

[0033] The simulated pre-pressing action parameter group includes the pre-pressing lengths of the multiple pre-pressing sections implemented by the adjustable frame and the simulated pressing strokes corresponding to the pre-pressing sections.

[0034] In a specific implementation, the step S212 includes:

[0035] Step S2121: calculating the extension coefficient of the rough pipe according to the extension length and the initial length;

[0036] Step S2122: determining the pre-pressing length of each pre-pressing section according to the section length of each thickness section and the elongation coefficient;

[0037] Step S2123: Determine the simulated pressing stroke of each of the pre-pressing sections according to the section thickness of each of the thickness sections and the target tube thickness of the finished tube.

[0038] In a specific implementation, the step S2123 includes:

[0039] Determine the initial pressing amount of the pre-pressing section corresponding to the thickness section according to the section thickness of any of the thickness sections and the target tube thickness of the finished tube;

[0040] Determine the end point pressing amount of the pre-pressing section corresponding to the thickness section according to the thickness of the adjacent thickness section of the thickness section and the target tube thickness of the finished tube;

[0041] The simulated pressing stroke of each pre-pressing section is determined according to the starting pressing amount and the ending pressing amount of each pre-pressing section.

[0042] In a specific embodiment, the pressing parameter group includes: the pressing rate and pressing stroke of the adjustable frame in each pre-pressing section, wherein step S213 includes:

[0043] Determining the pressing time of the adjustable frame in each pre-pressing section according to the jacking speed of the rough pipe and the pre-pressing length;

[0044] According to the simulated pressing stroke, the pressing stroke is obtained, and based on the pressing time and the pressing stroke, the pressing rate of the adjustable frame in each pre-pressing section is determined;

[0045] The pressing parameter group is determined according to the pressing rate and the pressing stroke.

[0046] In a specific embodiment, the target tube thickness of the finished tube is the minimum segment thickness of the plurality of thickness segments of the rough tube sample.

[0047] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0048] In the head and tail sharpening system and method of the pipe jacking machine provided by the present invention, the head and tail sharpening control system provided by the present invention, by arranging an adjustable frame between the outlet of the pipe jacking machine body and the tensioning and reducing machine, the pressure roller in the adjustable frame can perform segmented pressing operation on the rough pipe ejected from the outlet of the pipe jacking machine body, so that before the rough pipe enters the tensioning and reducing machine, the radial outer wall of itself has been pre-pressed with a reduced diameter, so that after the rough pipe pressed down by the adjustable frame enters the tensioning and reducing machine, the head and tail sections of the finished pipe produced by it can solve the problems of uneven wall thickness and excessive wall thickness to a certain extent, and avoid the problem of unusable head and tail sections of the finished pipe due to the problem of motor speed difference during the pipe biting process of the tensioning and reducing machine. Problem: The head and tail sharpening control method provided by the present invention adopts a head and tail sharpening control system, which can comprehensively control and adjust the pressing parameters of the adjustable frame according to the data of the unusable sections of the head and tail of the finished pipe caused by the pipe biting of the tensioning and reducing machine, and control the adjustable frame to perform segmented pressing operations on the rough pipe ejected from the pipe jacking machine according to the adjusted pressing parameters, that is, a calculation unit is used to determine the segmented length of the rough pipe and the corresponding pressing parameters, and a control unit is used to control the adjustable frame to complete the head and tail sharpening operations of the rough pipe according to the length of each segment and the corresponding pressing parameters, which can further solve the problems of unequal wall thickness, excessive wall thickness, etc., and improve the wall thickness quality of the finished pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural diagram of the head and tail sharpening system of the pipe jacking machine of the present invention;

[0050] Figure 2 It is a structural diagram of a first embodiment of an adjustable frame of a head and tail sharpening system of a pipe jacking machine of the present invention;

[0051] Figure 3 It is a structural diagram of a second embodiment of the adjustable frame of the head and tail sharpening system of the pipe jacking machine of the present invention;

[0052] Figure 4 It is a flow chart of the method for sharpening the head and tail of a pipe jacking machine of the present invention;

[0053] Figure 5 It is a flow chart of step S2 of the method for sharpening the head and tail of a pipe jacking machine of the present invention;

[0054] Figure 6 It is a flow chart of step S21 of the method for sharpening the head and tail of a pipe jacking machine of the present invention;

[0055] Figure 7 It is a flow chart of step S212 of the method for sharpening the head and tail of a pipe jacking machine of the present invention;

[0056] Figure 8 It is a flow chart of step S2123 of the method for sharpening the head and tail of a pipe jacking machine of the present invention;

[0057] Fig. 9 It is a flow chart of step S213 of the method for sharpening the head and tail of a pipe jacking machine of the present invention;

[0058] Fig.10 It is an implementation diagram of the pre-pressing section of a specific embodiment of the method for sharpening the head and tail of a pipe jacking machine of the present invention;

[0059] Fig.11 This is the cross-section of the rough pipe sample after passing through the tension reduction machine;

[0060] Fig.12 This is a cross-sectional view of the target finished tube.

[0061] Description of Figure Numbers:

[0062] 100, adjustable frame; 110, adjustable pressure roller;

[0063] 210, first thermal inspection piece; 220, second thermal inspection piece;

[0064] 300, pipe jacking machine;

[0065] A. Rolling center line;

[0066] L a , extension length;

[0067] L x , Preload length

[0068] D y , segment length;

[0069] S x , segment thickness;

[0070] S q , target tube thickness;

[0071] H z , initial pressure amount. DETAILED DESCRIPTION

[0072] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0073] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0075] Implementation Method 1

[0076] like Figures 1 to 3 As shown, the present invention provides a head and tail sharpening system for a pipe jacking machine, comprising:

[0077] At least one adjustable frame 100 disposed at the outlet of the bed of the pipe jacking machine 300, used for performing segmented pressing operation on the rough pipe ejected from the pipe jacking machine 300;

[0078] The head and tail sharpening control system is used for adjusting the pressing parameters of the adjustable frame 100 by segmented control.

[0079] The head and tail sharpening system of the pipe jacking machine provided by the present invention is provided with an adjustable frame 100 between the bed outlet of the pipe jacking machine 300 and the tensioning and reducing machine, so that the rollers in the adjustable frame 100 can perform segmented pressing operation on the rough pipe ejected from the bed outlet of the pipe jacking machine 300, so that the rough pipe has been pre-pressed on its radial outer wall before entering the tensioning and reducing machine, so that the rough pipe pressed down by the adjustable frame 100 can produce the head and tail sections of the finished pipe after entering the tensioning and reducing machine to a certain extent. The head and tail sharpening control system provided by the present invention can comprehensively control and adjust the pressing parameters of the adjustable frame 100 according to the data of the unusable head and tail sections of the finished pipe caused by the pipe biting of the stretching and reducing machine, and control the adjustable frame 100 to perform segmented pressing operations on the rough pipe ejected from the pipe jacking machine 300 according to the adjusted pressing parameters, which can further solve the problems of unequal wall thickness, excessive wall thickness, etc., and improve the wall thickness quality of the finished pipe.

[0080] Specifically, in this embodiment, the adjustable frame 100 includes a pressing tool capable of performing a pressing operation. The adjustable frame 100 of this embodiment includes an adjustable pressing roller 110. In other embodiments, other tools capable of performing an adjustable pressing operation may also be used. The adjustable frame 100 of this embodiment is disposed at the exit of the bed of the pipe jacking machine 300. The adjustable frame 100 may apply a downward pressure to the rough pipe along the radial direction of the rough pipe to reduce the radius of the outer wall.

[0081] like Figure 1 As shown, in a specific embodiment, the head and tail sharpening control system includes: a computing unit and a control unit;

[0082] The calculation unit is used to calculate the length of each segment and its corresponding pressing parameters, and the control unit is used to control the adjustable frame 100 to execute the pressing parameters of each segment on the rough pipe segment.

[0083] The head and tail sharpening control system provided in this embodiment can, through the calculation unit, appropriately segment the rough pipe, that is, it can divide the appropriate segments for the pressing operation of the adjustable frame 100 according to the characteristics of the rough pipe and the defects of the finished pipe, and can also calculate the corresponding pressing parameters when the adjustable frame 100 performs the pressing operation for each segment, so that the pressing parameters are adjusted according to the segments, which can significantly improve the forming quality of the head and tail segments of the finished pipe. The head and tail sharpening control system provided in this embodiment can, through the control unit, accurately adjust and control the adjustable frame 100 to perform the pressing operation according to the pressing operation segments and pressing parameters calculated by the calculation unit, which can directly improve the forming quality of the head and tail segments of the finished pipe.

[0084] In this embodiment, the calculation unit mainly calculates the length of each segment that the adjustable frame 100 needs to execute and the pressing parameters that the adjustable frame 100 needs to execute in each segment based on the shape parameters of the finished pipe output by the tensioning and reducing machine when the adjustable frame 100 is not set, combined with empirical constants. The adjustable frame 100 of this embodiment mainly controls its own pressing action through the control unit.

[0085] like Figure 2 and Figure 3 As shown, in a specific embodiment, the adjustable frame 100 has at least three adjustable pressure rollers 110, and the rough pipe is ejected along the rolling center line A of the pipe jacking machine 300. The adjustable pressure rollers 110 can press down in the direction close to the rolling center line A according to the pressing parameters, and one end of at least three adjustable pressure rollers 110 can abut against the same position on the rolling center line A.

[0086] The head and tail sharpening system of the pipe jacking machine provided in this embodiment can perform rolling operations on the rough pipe ejected from the rolling center line A of the pipe jacking machine 300 by setting at least three adjustable pressure rollers 110. One end of at least three adjustable pressure rollers 110 can abut against the same position on the rolling center line A, that is, the same position of the rough pipe can be pressed down by at least three adjustable pressure rollers 110 at the same time. Compared with the unilateral force applied to the rough pipe when a single rolling roller performs the pressing operation, the pressing operation applied simultaneously by at least three adjustable pressure rollers 110 can significantly improve the rolling quality of the rough pipe, and avoid the problem of uneven cross-sectional shape of the rough pipe that is easily caused when a single rolling roller performs the pressing operation.

[0087] Specifically, in this embodiment, the rough pipe is ejected along the rolling center line A of the pipe jacking machine 300 and transported along the rolling center line A. In this embodiment, the pressing direction of the adjustable frame 100 for the pressing operation is perpendicular to the rolling center line A and close to the rolling center line A. In other embodiments, the pressing direction of the adjustable frame 100 for the pressing operation can also be close to the rolling center line A.

[0088] In this embodiment, the movement directions of at least three adjustable pressure rollers 110 are different but they have the same intersection point, that is, when the at least three adjustable pressure rollers 110 of the adjustable frame 100 are performing the pressing operation, the at least three adjustable pressure rollers 110 can simultaneously abut against the outer pipe wall of the rough pipe located on the rolling center line A, thereby sharpening the rough pipe.

[0089] like Figure 2 and Figure 3 As shown, in a specific embodiment, at least three adjustable pressure rollers 110 are arranged at equal intervals along the circumference of the rolling center line A.

[0090] In the adjustable frame 100 provided in this embodiment, at least three adjustable pressure rollers 110 are arranged at equal intervals along the circumferential direction of the rolling center line A, and refer to Figure 3 As shown, that is, when the pressing direction of the adjustable pressure roller 110 is perpendicular to the rolling center line A and close to the rolling center line A, the pressing paths of at least three adjustable pressure rollers 110 have equal angles in the circumferential direction of the rolling center line A, which can make the outer peripheral wall of the rough pipe bear the force evenly and can significantly improve the forming quality of the finished pipe.

[0091] In the present embodiment, at least three adjustable pressing rollers 110 can simultaneously perform combined pressing down on the outer peripheral wall of the rough pipe, so that the diameter of the outer peripheral wall of the rough pipe can be controlled and adjusted by the adjustable frame 100; specifically in the present embodiment, the pressing down end of the adjustable pressing roller 110 has an inwardly concave arc structure, and when at least three adjustable pressing rollers 110 are simultaneously abutted against the same position on the rolling center line A, the arc structures at the pressing down ends of at least three adjustable pressing rollers 110 jointly form a circular through hole, and the rough pipe can be sharpened through the circular through hole; in a specific embodiment, there are three adjustable pressing rollers 110, and the pressing down operation directions of the three adjustable pressing rollers 110 have the same angle in the circumferential direction of the rolling center line A, that is, 120°.

[0092] like Figure 1 and Fig.10 As shown, in a specific embodiment, there are multiple adjustable frames 100, and the multiple adjustable frames 100 are arranged at intervals along the rolling center line A, and the interval between adjacent adjustable frames 100 is greater than the length of each segment.

[0093] The head and tail sharpening system of the pipe jacking machine provided in this embodiment has multiple adjustable frames 100. By setting up multiple adjustable frames 100 to perform multiple pressing operations on the rough pipe, it can be avoided that the rough pipe is only subjected to one pressing operation, but the rough pipe is restored to a certain extent to its original shape due to the recovery stress of the rough pipe material. Through multiple pressing and rolling of the adjustable frames 100, the recovery stress of the rough pipe can be eliminated, ensuring the sharpening effect of the rough pipe, so that the rough pipe that has undergone the pressing operation can improve the quality of the head and tail of the finished pipe after passing through the tensioning and reducing machine.

[0094] Specifically in the present embodiment, each adjustable rack 100 performs the pressing operation according to the pressing parameters calculated by the head and tail sharpening control system. If the positions of the multiple adjustable racks 100 are too close, the rough pipe that is undergoing a certain segment pressing operation in the previous adjustable rack 100 will not complete the pressing operation process of the segment, and the emerged rough pipe of the segment will enter the same segment sharpening operation process of the next adjustable rack 100, which will cause the problem of poor sharpening effect of the rough pipe.

[0095] In this embodiment, the spacing between adjacent adjustable racks 100 is greater than the length of each segment, so that the rough pipe that is undergoing a segment pressing operation in the previous adjustable rack 100 needs to complete the segment pressing operation process before the segmented rough pipe enters the same segment sharpening operation process of the next adjustable rack 100, which can significantly improve the quality of the rough pipe sharpening operation.

[0096] like Figures 1 to 3 As shown, in a specific embodiment, there is a rotation angle between the adjustable pressure rollers 110 of two adjacent adjustable frames 100 in the circumferential direction of the rolling center line A.

[0097] The pipe jacking machine head and tail sharpening system provided in this embodiment has a rotation angle between the adjustable pressure rollers 110 of two adjacent adjustable frames 100 in the circumferential direction of the rolling center line A, that is, the two adjacent adjustable frames 100 have different rotation angles relative to the rolling center line A, and the adjustable pressure rollers 110 of the two adjacent adjustable frames 100 are staggered in the axial direction of the rolling center line A, so that different adjustable frames 100 can perform pressing operations on different positions of the outer peripheral wall of the rough pipe, which can avoid the axial displacement of the rough pipe and the non-central symmetry of the cross-sectional shape of the rough pipe caused by pressing down the same position of the outer peripheral wall of the rough pipe.

[0098] Specifically, in this embodiment, there is a rotation angle between the adjustable pressure rollers 110 of two adjacent adjustable frames 100 in the circumferential direction of the rolling center line A, that is, at least three adjustable pressure rollers 110 of two adjacent adjustable frames 100 are staggered in the axial direction of the rolling center line A, and in this embodiment, the rotation angles of at least three adjustable pressure rollers 110 of two adjacent adjustable frames 100 on the axial projection of the rolling center line A are equal. In other embodiments, the rotation angles of at least three adjustable pressure rollers 110 of two adjacent adjustable frames 100 on the axial projection of the rolling center line A may also be different.

[0099] In a specific embodiment of the present invention, the head and tail sharpening system of the pipe jacking machine has two adjustable frames 100, each of which has three adjustable pressure rollers 110. The three adjustable pressure rollers 110 of each adjustable frame 100 are arranged at circumferential intervals on the rolling center line A, that is, the angles of the pressing directions of the three adjustable pressure rollers 110 on the circumferential direction of the rolling center line A are all 120°; in this embodiment, the rotation angles of the three adjustable pressure rollers 110 of two adjacent adjustable frames 100 on the axial projection of the rolling center line A are all equal, that is, the rotation angles between the adjustable pressure rollers 110 of each adjustable frame 100 and the adjustable pressure rollers 110 of the adjacent adjustable frames 100 on the axial projection of the rolling center line A are all 60°.

[0100] like Figure 1 and Figure 2 As shown, in a specific embodiment, the rotation angle is greater than 0° and the rotation angle is less than 120°.

[0101] The head and tail sharpening system of the pipe jacking machine provided in this embodiment limits the rotation angle to between 0° and 120°, so as to avoid the situation where the rotation angle is too large and the circumference of the rough pipe cannot be effectively staggered and pressed down.

[0102] like Figure 1 As shown, in a specific embodiment, the head and tail sharpening system of the pipe jacking machine also includes:

[0103] A first thermal inspection piece 210 is disposed on a side of the adjustable frame 100 close to the pipe jacking machine 300. The first thermal inspection piece 210 is disposed toward the rolling center line A and is used to detect the running distance of the rough pipe;

[0104] The second thermal inspection piece 220 is disposed on a side of the adjustable frame 100 away from the pipe jacking machine 300. The second thermal inspection piece 220 is disposed toward the rolling center line A and is used to monitor the tail of the rough pipe.

[0105] The head and tail sharpening system of the pipe jacking machine provided in this embodiment can detect the running distance of the rough pipe after entering the adjustable frame 100 by setting the first thermal inspection piece 210, and provide it to the control unit of the head and tail sharpening control system. The control unit can adjust the control unit to control the adjustable frame 100 to execute the pressing parameters of each segment for the rough pipe segment entering the pressing operation range of the adjustable pressure roller 110; and set the second thermal inspection piece 220 to detect whether the tail of the rough pipe leaves the adjustable frame 100. When the tail of the rough pipe leaves the adjustable frame 100, the control unit controls the adjustable pressure roller 110 of the adjustable frame 100 to return to its original position and stop the pressing operation.

[0106] Related References Fig.10 As shown, specifically in this embodiment, the first thermal inspection component 210 is arranged on the side of the adjustable frame 100 close to the pipe jacking machine 300, that is, it can detect the length of the rough pipe entering the adjustable frame 100, and the second thermal inspection component 220 is arranged on the side of the adjustable frame 100 away from the pipe jacking machine 300, that is, it can detect whether the tail of the rough pipe leaves the adjustable frame 100.

[0107] In a specific embodiment of the present invention, there are two adjustable frames 100, and the two first thermal inspection pieces 210 are respectively arranged on the side of the two adjustable frames 100 close to the pipe jacking machine 300, and the two second thermal inspection pieces 220 are respectively arranged on the side of the adjustable frames 100 away from the pipe jacking machine 300.

[0108] In another specific embodiment of the present invention, there are two adjustable racks 100, the first thermal inspection member 210 is arranged on a side of the adjustable rack 100 close to the pipe jacking machine 300, and the second thermal inspection member 220 is arranged on a side of the adjustable rack 100 far from the pipe jacking machine 300. In this embodiment, the first thermal inspection member 210 and the second thermal inspection member 220 are started together with the head and tail sharpening control system and the adjustable rack 100, and the specific coordination process is as follows:

[0109] When the first thermal inspection piece 210 detects the head of the rough pipe, the head and tail sharpening control system starts to calculate the running distance of the rough pipe head in real time, and compares the running distance of the rough pipe head with the distance between the first thermal inspection piece 210 and the adjustable frame 100 close to the pipe jacking machine 300, and the length of each segment calculated by the head and tail sharpening control system, and the head and tail sharpening control system controls the adjustable frame 100 close to the pipe jacking machine 300 to execute the pressing parameters of the segment;

[0110] The running distance of the rough pipe head is compared with the distance between the first heat inspection piece 210 and the adjustable frame 100 close to the pipe jacking machine 300, the distance between the adjustable frame 100 close to the pipe jacking machine 300 and the adjustable frame 100 far from the pipe jacking machine 300, and the length of each segment calculated by the head and tail sharpening control system, and the head and tail sharpening control system controls the adjustable frame 100 far from the pipe jacking machine 300 to execute the pressing parameters of the segment;

[0111] When the first thermal inspection member 210 detects the tail of the rough pipe, the head and tail sharpening control system starts to calculate the running distance of the tail of the rough pipe in real time, and compares the running distance of the tail of the rough pipe with the running distance of the head of the rough pipe and the distances of each segment calculated by the head and tail sharpening control system;

[0112] When the second heat inspection member 220 detects the head and tail of the rough pipe, it indicates that the rough pipe sharpening is completed, and the head and tail sharpening control system controls the two adjustable racks 100 to reset.

[0113] Implementation Method 2

[0114] like Figure 1 and Figure 4 As shown, the present invention also provides a method for sharpening the head and tail of a pipe jacking machine, which is used in the pipe jacking machine head and tail sharpening system as described above. The method for sharpening the head and tail of a pipe jacking machine comprises:

[0115] Step S1: at least one adjustable frame 100 is arranged at the exit of the bed of the pipe jacking machine 300;

[0116] Step S2: The head and tail sharpening control system is used to adjust the pressing parameters of the adjustable frame 100 on the rough pipe in sections to complete the sharpening operation of the head and tail sections of the rough pipe.

[0117] The method for sharpening the head and tail of a pipe jacking machine provided by the present invention comprises the following steps: in step S1, an adjustable frame 100 is arranged between the outlet of the pipe jacking machine 300 bed and the tensioning and reducing machine, and the pressure rollers in the adjustable frame 100 can press down the rough pipe ejected from the outlet of the pipe jacking machine 300 bed, so that the rough pipe has been pre-pressed on its radial outer wall before entering the tensioning and reducing machine, so that after the rough pipe pressed down by the adjustable frame 100 enters the tensioning and reducing machine, the head and tail sections of the finished pipe produced by the rough pipe can solve the problems of uneven wall thickness and excessive wall thickness to a certain extent, and avoid the problem of unusability of the head and tail sections of the finished pipe due to the problem of motor speed difference during the pipe biting process of the tensioning and reducing machine.

[0118] The method for sharpening the head and tail of a pipe jacking machine provided by the present invention, in step S2, can control the pressure rollers in the adjustable frame 100 to perform segmented pressing operations on the rough pipe ejected from the outlet of the pipe jacking machine 300 bed through the head and tail sharpening control system, that is, according to the data of the unusable segments of the head and tail of the finished pipe caused by the pipe biting of the tensioning and reducing machine, the pressing parameters of the adjustable frame 100 can be comprehensively controlled and adjusted, and the adjustable frame 100 can be controlled to perform segmented pressing operations on the rough pipe ejected from the pipe jacking machine 300 according to the adjusted pressing parameters, which can further solve the problems of uneven wall thickness, excessive wall thickness, etc., and improve the wall thickness quality of the finished pipe.

[0119] like Figure 5 As shown, in a specific embodiment, the head and tail sharpening control system includes a calculation unit and a control unit, and step S2 includes:

[0120] Step S21: determining the segment length of the rough pipe and its corresponding pressing parameters through the calculation unit;

[0121] Step S22: The control unit controls the adjustable frame 100 to perform pressing operations on the rough pipe segments according to the lengths of the segments and their corresponding pressing parameters, thereby completing the sharpening operation on the head and tail segments of the rough pipe.

[0122] The head and tail sharpening method of the pipe jacking machine provided in this embodiment can, in step S21, appropriately segment the rough pipe through the calculation unit, that is, can divide the appropriate segments for the pressing operation of the adjustable frame 100 according to the characteristics of the rough pipe and the defects of the finished pipe, and can also calculate the corresponding pressing parameters when the adjustable frame 100 performs the pressing operation for each segment, so that the pressing parameters are adjusted according to the segments, which can significantly improve the forming quality of the head and tail segments of the finished pipe. The head and tail sharpening control system provided in this embodiment can, in step S22, accurately adjust and control the adjustable frame 100 to perform the pressing operation according to the pressing operation segments and pressing parameters calculated by the calculation unit through the control unit, which can directly improve the forming quality of the head and tail segments of the finished pipe.

[0123] In this embodiment, the calculation unit mainly segments the action of the adjustable frame 100 performing the pressing operation according to the shape parameters of the finished pipe output by the tensioning and reducing machine when the adjustable frame 100 is not set, and calculates the pressing parameters that the adjustable frame 100 needs to perform in each segment according to the segmented results combined with empirical constants; the control unit in this embodiment mainly controls the pressing action of the adjustable frame 100, that is, the control unit mainly controls the pressing roller in the adjustable frame 100 to perform the pressing action along the radial direction of the rough pipe toward the rough pipe.

[0124] like Figure 6 As shown, in a specific implementation, step S21 includes:

[0125] Step S211: obtaining a first size parameter of the rough pipe sample before entering the stretching and reducing machine, and a second size parameter group of the rough pipe sample after passing through the stretching and reducing machine;

[0126] Step S212: Determine a simulated pre-compression action parameter group of the adjustable rack 100 according to the first size parameter group and the second size parameter group and the flow equalization principle;

[0127] Step S213: Determine the pressing parameter group of the adjustable frame 100 according to the simulated pre-pressing action parameter group and the jacking speed of the rough pipe.

[0128] The method for sharpening the head and tail of a pipe jacking machine provided in this embodiment, when the adjustable frame 100 is not set, obtains the first size parameter of the rough pipe sample ejected from the pipe jacking machine 300, so as to know the initial shape of the rough pipe ejected from the pipe jacking machine 300, and obtains the second size parameter group of the rough pipe sample after passing through the stretching and reducing machine, so as to know what kind of quality result the stretching and reducing machine will cause to the rough pipe in the initial shape, so as to facilitate the corresponding calculation of the head and tail sharpening control system.

[0129] The method for sharpening the head and tail of a pipe jacking machine provided in the present embodiment can first calculate the segments of the pressing operation action of the adjustable frame 100 through a calculation unit according to the first size parameter and the second size parameter group that have been obtained, and calculate the simulated pre-pressing action parameter group of the adjustable frame 100 corresponding to each segment; according to the simulated pre-pressing action parameter group calculated by the calculation unit, after the adjustable frame 100 is set, combined with the speed of the rough pipe output, a pressing parameter group for determining the actual operation of the adjustable frame 100 can be generated, which is used to press the rough pipe down.

[0130] In this embodiment, the adjustable frame 100 operated by this method can be adjusted accordingly according to different specifications of rough pipes, different specifications of pipe jacking machines 300 or rough pipes produced at different production sites. Compared with the method of using fixed empirical parameters to calculate the pressure parameters or adjusting the motor speed of the tensioning and reducing machine, it can more accurately and specifically improve the quality of the head and tail sections of the rough pipe.

[0131] like Figure 1 and Fig.11 As shown, in one specific embodiment,

[0132] The first size parameter includes the initial length of the rough pipe sample before entering the tension-reduction machine;

[0133] The second size parameter group includes the extension length of the rough pipe sample after passing through the stretching and reducing machine, and the segment lengths and segment thicknesses of a plurality of thickness segments with different inner wall thicknesses formed by the rough pipe sample after passing through the stretching and reducing machine;

[0134] The simulated pre-pressing action parameter group includes the pre-pressing lengths of the multiple pre-pressing sections implemented by the adjustable frame 100 and the simulated pressing strokes corresponding to the pre-pressing sections.

[0135] In the method for sharpening the head and tail of a pipe jacking machine provided in this embodiment, the parameters of the rough pipe sample corresponding to the first dimensional parameter and the second dimensional parameter group are obtained under the condition that the adjustable frame 100 is not set at the outlet of the pipe jacking machine 300 to press down the rough pipe; the first dimensional parameter and the second dimensional parameter group need to obtain the length of the rough pipe sample, the segment length of each thickness segment, and the wall thickness, which are parameters that are easy for on-site operators to measure, and can significantly improve the work efficiency in the preparation stage; at the same time, the above parameters are used for calculation by the calculation unit, which can more realistically feedback the changes of the rough pipe sample before and after tensioning and reduction, so that the generated simulated pre-pressing action parameter group and the pressing parameter group can improve the quality of the head and tail segments of the finished pipe with higher quality.

[0136] In the method for sharpening the head and tail of the pipe jacking machine provided in this embodiment, the simulated pre-pressing action parameter group includes the pre-pressing length of each pre-pressing section, that is, the pressing operation action of the adjustable frame 100 is segmented, especially the segments are divided according to the lengths of the thickness sections of the rough pipe, that is, the actions that the adjustable frame 100 needs to perform are segmented and correspondingly implemented according to the thickness sections on the length of the rough pipe. In this embodiment, corresponding adjustments are made according to the quality of the rough pipe sample before and after entering the tensioning and reducing machine, which more accurately improves the quality of the head and tail sections of the finished pipe.

[0137] Related References Fig.10 and Fig.11As shown, in a specific embodiment, the method for sharpening the head and tail of a pipe jacking machine provided by the present invention is segmented according to the characteristics of the rough pipe, and seven sections are divided from the head to the tail, wherein the first section and the second section are sections away from the core rod of the pipe jacking machine 300, and the pipe walls of the first section and the second section are thicker and vary greatly, because both are the head area to be sharpened, the third section is in the higher temperature area of ​​the core rod in the pipe jacking machine 300, so the third section is a uniform wall thickness area, the fourth section is in the transition zone between the higher temperature area and the normal temperature area of ​​the core rod in the pipe jacking machine 300, and the wall thickness of the fourth section varies the most, the fifth section is in the normal temperature area in the pipe jacking machine 300, so the wall thickness of the fifth section is relatively uniform, but the temperature of the fifth section is not high, and the wall thickness of the fifth section is relatively thick, the sixth section and the seventh section gradually move away from the normal temperature area in the pipe jacking machine 300, so the pipe walls of the sixth section and the seventh section are thicker and vary greatly, because both are the tail area to be sharpened.

[0138] In the method for sharpening the head and tail of a pipe jacking machine provided in the present embodiment, the simulated pre-pressing action parameter group includes a simulated pressing stroke of each pre-pressing section. In a specific embodiment, the simulated pressing stroke can be a fixed value, that is, the adjustable frame 100 maintains the pressing amount corresponding to the section after pressing the section and waits for the pressing operation of the section to be completed. Before entering the next section, the adjustable frame 100 is adjusted to the pressing amount corresponding to the next section, waiting for the rough pipe of the next section to be transported for the pressing operation; in another embodiment, the simulated pressing stroke can also be a vector, that is, during the pressing operation of the section, the adjustable frame 100 is gradually raised or pressed down from the initial pressing amount of the section to the initial pressing amount of the next section, so that the entire pressing operation is continuous and can be more dynamically pressed according to the wall thickness change trend of the rough pipe; so that the sharpening quality of the head and tail sections of the finished pipe is higher.

[0139] like Figure 7 As shown, in a specific implementation, step S212 includes:

[0140] Step S2121: According to the extension length L a and the initial length L b , calculate the extension coefficient μ of the rough pipe;

[0141] Step S2122: Determine the pre-pressing length L of each pre-pressing section according to the section length and elongation coefficient μ of each thickness section. x ;

[0142] Step S2123: Determine the simulated pressing stroke of each pre-pressing section according to the section thickness of each thickness section and the target tube thickness of the finished tube.

[0143] The method for sharpening the head and tail of a pipe jacking machine provided in this embodiment comprises, in step S2121, a method for sharpening the head and tail of a pipe jacking machine according to the initial length L of the rough pipe sample before entering the tensioning and reducing machine. bAnd the extension length L after entering the tensioning and reducing machine a , the elongation coefficient μ of the rough pipe material can be calculated, and the elongation coefficient μ can be used to adjust the pre-pressing length L of the adjustable rack 100 when pressing down the rough pipe. x The calculation method of the elongation coefficient μ is as follows:

[0144] μ=L a / L b

[0145] Where, μ is the elongation coefficient; L a is the extension length, mm; L b is the initial length, mm.

[0146] In this embodiment, step S2121 can calculate the pre-pressing length L of the adjustable frame 100 for pressing down the rough pipe of each thickness according to the segment length and elongation coefficient μ of each thickness segment of the rough pipe sample after passing through the tensioning and reducing machine. x , where the preload length L x The calculation method of is as follows:

[0147]

[0148] Where, μ is the elongation coefficient; L x is the preloading length of each preloading section, mm (x is an integer greater than or equal to 1, and the value range of x is limited to the number of preloading sections); D y is the length of each thickness segment, mm (y is an integer greater than or equal to 1, and the value range of y is limited to the number of thickness segments).

[0149] Specifically in this embodiment, step S2123 uses the simulated pressing stroke as a vector, that is, the adjustable frame 100 moves and presses during the pressing operation, so that the entire pressing operation is continuous, and the quality of the head and tail sharpening of the finished pipe is higher.

[0150] like Figure 8 As shown, in a specific implementation, step S2123 includes:

[0151] Step A1: According to the segment thickness of any thickness segment and the target tube thickness S of the finished tube q , determine the initial pressing amount H of the pre-pressing section corresponding to the thickness section z ;

[0152] Step A2: According to the thickness S of the adjacent thickness segment ejected from the adjacent thickness segment x and the target tube thickness S of the finished tube q , determine the end point reduction H of the pre-pressing section corresponding to the thickness section z °;

[0153] Step A3: According to the initial pressing amount H of each pre-pressing section z and the end point pressure H z °, determine the simulated pressing stroke of each pre-compression section.

[0154] The method for sharpening the tip and tail of a pipe jacking machine provided in this embodiment, specifically in step A1, the adjustable frame 100 can perform a pressing operation along the radial direction of the rough pipe toward the rough pipe, wherein the outer pipe wall of the rough pipe is used as the initial pressing point of the adjustable frame 100, and the adjustable frame 100 performs a pressing operation along the radial direction of the rough pipe toward the axis of the rough pipe from the initial pressing point, and the initial pressing amount H of the adjustable frame 100 is z The distance that the adjustable frame 100 is pressed down from the starting pressing point along the radial direction of the rough pipe toward the axis of the rough pipe, and the distance that the adjustable frame 100 is pressed down from the starting pressing point along the radial direction of the rough pipe toward the axis of the rough pipe, Fig.11 and Fig.12 As shown, the initial pressing amount H in this embodiment z The thickness S of the thickness segment x and the target tube thickness S of the finished tube q The specific calculation method is as follows:

[0155] H z =S x -S q

[0156] Among them, H z is the initial compression amount of each pre-compression section, mm (z is an integer greater than or equal to 1, and the value range of z is limited to the number of pre-compression sections); S x is the thickness of each thickness segment, mm (x is an integer greater than or equal to 1, and the value range of x is limited to the number of thickness segments); S q is the target tube thickness of the finished tube, mm.

[0157] The method for sharpening the tip and tail of a pipe jacking machine provided in this embodiment is as follows: in step A2, the adjustable frame 100 is pressed down by an amount H at the end point of the thickness section. z °The thickness of the adjacent thickness segment ejected from the adjacent back S x ° and the target tube thickness S of the finished tube q Determine, where the end point reduction H of the thickness section z ° is the initial reduction amount H of the adjacent thickness section of the adjacent rear ejection z The adjacent thickness section of the adjacent rear ejection is also the adjacent thickness section from the head to the tail of the rough pipe. In a specific embodiment, the adjacent thickness section of the adjacent rear ejection of the first section is the second section. The terminal pressure reduction H in this embodiment z The specific calculation method of ° is as follows:

[0158] H z °=S x°-S q

[0159] Among them, H z ° is the terminal pressing amount corresponding to each pre-pressing section, mm (z is an integer greater than or equal to 1, and the value range of z is limited to the number of pre-pressing sections); S x ° is the thickness of the adjacent thickness segment, mm (x is an integer greater than or equal to 1, and the value range of x is 1 less than the number of thickness segments); S q is the target tube thickness of the finished tube, mm.

[0160] The method for sharpening the tip and tail of a pipe jacking machine provided in this embodiment is as follows: in step A3, the rough pipe is output from the pipe jacking machine 300, and the tip and tail sharpening control system controls the adjustable frame 100 to first press down the initial pressing amount H of the segment in each segment. z The control system for sharpening the end of the pipe controls the adjustable rack 100 to gradually reduce the pressing amount H from the initial pressing amount according to the moving distance of the rough pipe. z The change is the final pressing amount, which makes the whole pressing operation continuous and the quality of the head and tail sharpening of the finished tube is higher.

[0161] like Fig. 9 As shown, in a specific embodiment, the pressing parameter group includes: the pressing rate and pressing stroke of the adjustable frame 100 in each pre-pressing section, wherein step S213 includes:

[0162] Step B1: According to the jacking speed and preloading length L of the rough pipe x , determine the pressing time T of the adjustable frame 100 in each pre-pressing section;

[0163] Step B2: According to the simulated pressing stroke, the pressing stroke is obtained, and based on the pressing time T and the pressing stroke, the pressing rate v of the adjustable frame 100 in each pre-pressing section is determined. y ;

[0164] Step B3: According to the pressing rate v y and pressing stroke to determine the pressing parameter group.

[0165] The method for sharpening the tip and tail of a pipe jacking machine provided in this embodiment includes a pressing parameter group including a pressing rate v of each pre-pressing section. y and the pressing stroke, that is, when the adjustable frame 100 performs the pressing operation, the pressing stroke is a vector, the pressing direction of the adjustable frame 100 in each section of the pressing stroke is the direction of approaching or moving away from the axis of the rough pipe along the radial direction of the rough pipe, and the pressing distance of the adjustable frame 100 in each section of the pressing stroke is the difference between the initial pressing amount and the final pressing amount; the pressing rate v y It is the moving speed of the adjustable frame 100 from the initial pressing amount to the final pressing amount.

[0166] The method for sharpening the tip and tail of a pipe jacking machine provided in this embodiment comprises step B1, according to the jacking speed and preloading length L of the rough pipe. x , it can be determined that when the adjustable frame 100 performs the pressing stroke in each segment, the pressing time T adjusted from the starting pressing amount to the end pressing amount can be calculated as follows:

[0167]

[0168] Among them, L x is the preloading length of each preloading section, mm (x is an integer greater than or equal to 1, and the value range of x is limited to the number of preloading sections); T is the pressing time corresponding to each preloading section, s; v s is the pipe jacking speed, mm / s.

[0169] The method for sharpening the tip and tail of a pipe jacking machine provided in this embodiment, in step B2, the simulated pressing stroke in the simulated pre-pressing action parameter group is converted into the pressing stroke of the pressing parameter group, and the pressing rate v of the adjustable frame 100 from the initial pressing amount to the final pressing amount can be determined according to the pressing time T and the pressing stroke. y , the specific calculation is as follows:

[0170]

[0171] Among them, v y is the pressing rate corresponding to each pre-pressing section, mm / s; T is the pressing time corresponding to each thickness section, s; H z ° is the terminal pressure reduction corresponding to each pre-pressing section (z is an integer greater than or equal to 1, and the value range of z is limited to the number of pre-pressing sections); H z is the initial compression amount corresponding to each pre-compression section, mm (z is an integer greater than or equal to 1, and the value range of z is limited to the number of pre-compression sections);

[0172] The method for sharpening the tip and tail of a pipe jacking machine provided in this embodiment, step B3 can convert the above-determined pressing stroke and pressing rate v y The combination is a pressing parameter group, which can be provided to the head and tail sharpening control system for segmented control and adjustment of the pressing parameters of the adjustable frame 100 on the rough pipe to complete the sharpening operation of the head and tail sections of the rough pipe.

[0173] like Figure 1 and Figure 2 As shown, in a specific embodiment, the target tube thickness of the finished tube is the minimum segment thickness of the multiple thickness segments of the rough tube sample.

[0174] The method for sharpening the head and tail of a pipe jacking machine provided in this embodiment determines the minimum segment thickness of multiple thickness segments of the rough pipe sample as the target pipe thickness of the finished pipe, which can avoid the situation where the wall thickness of the finished pipe after passing through the stretching and reducing machine is still uneven if the non-minimum segment thickness of multiple thickness segments of the rough pipe sample is used as the finished pipe; using the minimum segment thickness can improve the uniformity of each segment after the stretching and reducing machine, and improve the quality of the head and tail segments of the finished pipe.

[0175] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipe jacking machine head and tail sharpening system, characterized in that: include: At least one adjustable frame arranged at the outlet of the pipe jacking machine body, used for performing segmented pressing operation on the rough pipe ejected from the pipe jacking machine; The head and tail sharpening control system is used for segmented control and adjustment of the pressing parameters of the adjustable frame.

2. The pipe jacking machine head and tail sharpening system according to claim 1, characterized in that: The head and tail sharpening control system comprises: a calculation unit and a control unit; The calculation unit is used to calculate the length of each segment and the corresponding pressing parameter, and the control unit is used to control the adjustable frame to execute the pressing parameter of each segment on the rough pipe segment.

3. The pipe jacking machine head and tail sharpening system according to claim 1, characterized in that: The adjustable frame has at least three adjustable pressure rollers. The rough pipe is ejected along the rolling center line of the pipe jacking machine. The adjustable pressure rollers can press down in a direction close to the rolling center line according to the pressing parameters. One end of at least three adjustable pressure rollers can abut the same position on the rolling center line.

4. The pipe jacking machine head and tail sharpening system according to claim 3, characterized in that: At least three adjustable pressure rollers are arranged at equal intervals along the circumference of the rolling center line.

5. The pipe jacking machine head and tail sharpening system according to claim 3 or 4, characterized in that: There are multiple adjustable frames, and the multiple adjustable frames are arranged at intervals along the rolling center line. The spacing between adjacent adjustable frames is greater than the length of each segment.

6. The pipe jacking machine head and tail sharpening system according to claim 5, characterized in that: There is a rotation angle between the adjustable pressure rollers of two adjacent adjustable frames in the circumferential direction of the rolling center line.

7. The pipe jacking machine head and tail sharpening system according to claim 6, characterized in that: The rotation angle is greater than 0°, and the rotation angle is less than 120°.

8. The pipe jacking machine head and tail sharpening system according to claim 3, characterized in that: The pipe jacking machine head and tail sharpening system also includes: A first thermal inspection piece, which is arranged on a side of the adjustable frame close to the pipe jacking machine, and the first thermal inspection piece is arranged toward the rolling center line, and is used to detect the running distance of the rough pipe; A second thermal inspection piece is arranged on a side of the adjustable frame away from the pipe jacking machine. The second thermal inspection piece is arranged toward the rolling center line and is used to monitor the tail of the rough pipe.

9. A method for sharpening the tip and tail of a pipe jacking machine, used in the tip and tail sharpening system of a pipe jacking machine as claimed in any one of claims 1 to 8, characterized in that: The method for sharpening the head and tail of a pipe jacking machine comprises: Step S1: at least one adjustable frame is arranged at the exit of the pipe jacking machine body; Step S2: adjusting the pressing parameters of the adjustable frame on the rough pipe by segmented control through the head and tail sharpening control system to complete the head and tail sharpening operation of the rough pipe.

10. The method for sharpening the head and tail of a pipe jacking machine according to claim 9, characterized in that: The head and tail sharpening control system includes a calculation unit and a control unit, and the step S2 includes: Step S21: determining the segment length of the rough pipe and the corresponding pressing parameter thereof by the calculation unit; Step S22: The control unit controls the adjustable frame to perform pressing operations on the rough pipe segments according to the lengths of the segments and the corresponding pressing parameters, thereby completing the sharpening operation of the head and tail segments of the rough pipe.

11. The method for sharpening the head and tail of a pipe jacking machine according to claim 10, characterized in that: Step S21 includes: Step S211: obtaining a first size parameter of the rough pipe sample before entering the stretching and reducing machine, and a second size parameter group of the rough pipe sample after passing through the stretching and reducing machine; Step S212: determining a simulated pre-compression action parameter group of the adjustable rack according to the first size parameter group and the second size parameter group and the flow equalization principle; Step S213: determining a pressing parameter group of the adjustable frame according to the simulated pre-pressing action parameter group and the jacking speed of the rough pipe.

12. The method for sharpening the head and tail of a pipe jacking machine according to claim 11, characterized in that: The first size parameter includes the initial length of the rough pipe sample before entering the tensioning and reducing machine; The second size parameter group includes the extension length of the rough pipe sample after passing through the stretching and reducing machine, and the segment lengths and segment thicknesses of a plurality of thickness segments with different inner wall thicknesses formed by the rough pipe sample after passing through the stretching and reducing machine; The simulated pre-pressing action parameter group includes the pre-pressing lengths of the multiple pre-pressing sections implemented by the adjustable frame and the simulated pressing strokes corresponding to the pre-pressing sections.

13. The method for sharpening the head and tail of a pipe jacking machine according to claim 12, characterized in that: The step S212 comprises: Step S2121: calculating the extension coefficient of the rough pipe according to the extension length and the initial length; Step S2122: determining the pre-pressing length of each pre-pressing section according to the section length of each thickness section and the elongation coefficient; Step S2123: Determine the simulated pressing stroke of each of the pre-pressing sections according to the section thickness of each of the thickness sections and the target tube thickness of the finished tube.

14. The method for sharpening the head and tail of a pipe jacking machine according to claim 13, characterized in that: The step S2123 includes: Determine the initial pressing amount of the pre-pressing section corresponding to the thickness section according to the section thickness of any of the thickness sections and the target tube thickness of the finished tube; Determine the end point pressing amount of the pre-pressing section corresponding to the thickness section according to the thickness of the adjacent thickness section of the thickness section and the target tube thickness of the finished tube; The simulated pressing stroke of each pre-pressing section is determined according to the starting pressing amount and the ending pressing amount of each pre-pressing section.

15. The method for sharpening the head and tail of a pipe jacking machine according to claim 12, characterized in that: The pressing parameter group includes: the pressing rate and pressing stroke of the adjustable frame in each pre-pressing section, wherein step S213 includes: Determining the pressing time of the adjustable frame in each pre-pressing section according to the jacking speed of the rough pipe and the pre-pressing length; According to the simulated pressing stroke, the pressing stroke is obtained, and based on the pressing time and the pressing stroke, the pressing rate of the adjustable frame in each pre-pressing section is determined; The pressing parameter group is determined according to the pressing rate and the pressing stroke.

16. The method for sharpening the head and tail of a pipe jacking machine according to claim 14, characterized in that: The target tube thickness of the finished tube is the minimum segment thickness of the multiple thickness segments of the rough tube sample.

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