Shield threaded hole repairing method

Abstract

The invention discloses a shield body threaded hole repairing method which comprises the following steps: marking an interference threaded hole: splicing a plurality of shield body blocks into a circle, assembling the circle with a main drive or an adaptive tool, finding out a threaded hole which interferes with a through hole, and marking the threaded hole as the interference threaded hole; and marking the circle centers of the through holes: installing plugs in the interference threaded holes, and punching the circle centers 0 of the correspondingly arranged through holes on the plugs through sample punching equipment. And recording circle center coordinates: installing and positioning the shield body blocks on processing equipment to record the circle center coordinates of the circle center 0, and then taking out the plug. And repairing, machining and mounting: reaming the interference threaded hole according to the circle center coordinate to form a mounting bottom hole, and fixedly mounting the threaded sleeve with the original threaded hole in the shield block into the mounting bottom hole again. The method is high in repairing efficiency, low in labor intensity of repairing operation and low in error accumulation risk, and the problems that in the existing repairing process, the surfacing amount is large, the shield block circle splicing time is long, and the overall machining efficiency is low are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of machining and assembling a shield of a tunnel boring machine, and in particular to a method for repairing a threaded hole of a shield. Background Art

[0002] The shield body is the main component of the shield machine. It is usually divided into several shield body blocks 11 according to the excavation diameter. The function is to provide sufficient strength and rigidity to support various loads and stresses of the shield machine during the excavation process. The threaded hole 12 on it is connected with the through hole 14 on the main drive 13 through a long screw 15 to ensure the stability and rigidity of the main drive 13. The inner circular sealing ring 16 of the shield body cooperates with the main drive 13 to ensure the overall sealing. Figure 1 To ensure smooth assembly of the shield body blocks and the main drive 13 at the construction site, the threaded hole 12 and the inner circle sealing ring 16 have high coaxiality and position requirements.

[0003] Some remanufacturing projects have been in use for a long time and in a harsh environment. At the same time, welding deformation will occur when replacing the rusted inner circle sealing ring 16. These factors will cause the threaded hole 12 and the through hole 14 on the main drive 13 to be misaligned after the shield body is assembled into a circle, and the long screw 15 will interfere with the assembly. The same situation may also occur in some new machines due to insufficient machine tool accuracy and unreasonable process design.

[0004] Since the data of the threaded holes 12 offset on each shield body block 11 are irregular, the method of repairing by hole-finding in a single block has the risk of error accumulation, and it takes a long time to repeatedly piece the blocks together. Taking the 8.8-meter diameter earth pressure shield as an example, the existing repair plan is to fill several M60 threaded holes with a depth of 230 with surfacing welding and ensure that there are no defects after processing, and then piece the four shield body blocks 11 together and re-drill and tap the whole body on a special machine. The repair time is long, the repair difficulty is high, and the repair efficiency is low. Summary of the invention

[0005] The present invention provides a shield threaded hole repair method to solve the technical problems that the existing repair method adopts a single block to find the hole method for repair, which has the risk of error accumulation, and the repeated assembly of the blocks is time-consuming, or the whole is assembled by a special machine after being filled with surfacing welding, and then drilled and tapped, resulting in a long repair time, great difficulty and low repair efficiency.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A shield threaded hole repair method is used to repair the deformation and dislocation of the threaded hole set inwardly on the end face of the shield body, and comprises the following steps: interference threaded hole marking: a plurality of shield body blocks are assembled into a circle and assembled with a main drive or an adapter tooling that replaces the main drive to find out the threaded holes that interfere with the through holes on the main drive or the through holes on the adapter tooling, and mark them as interference threaded holes; through hole center marking: a plug for marking the center position of the corresponding through hole is installed in each interference threaded hole, and the center 0 of the corresponding through hole is punched out on the plug by a sample punching device; center coordinate recording: the shield body blocks are installed and positioned on the processing equipment to record the center coordinate of the center 0 and then the plug is removed; repair processing and installation: the interference threaded hole is expanded according to the center coordinate to form an installation bottom hole, and a threaded sleeve with the original threaded hole on the shield body block is re-fixed in the installation bottom hole.

[0008] Furthermore, in the step of "interference threaded hole marking", the adapter tooling includes a hollow ring-shaped adapter ring; the end face of the adapter ring is provided with a pin hole that vertically penetrates the end face for positioning, a plurality of through holes that are arranged in sequence along the circumferential direction and vertically penetrate the end face, and a plurality of lifting holes that are arranged in sequence along the circumferential direction and vertically penetrate the end face for lifting.

[0009] Furthermore, the adapter tooling also includes a plurality of positioning blocks for positioning the shield body segments, and the plurality of positioning blocks are connected to the end face of the adapter ring in sequence and at intervals along the circumferential direction; each positioning block extends to the bottom of the inner circle sealing ring on the corresponding shield body segment, and the inner wall surface on the positioning block for fitting with the inner circle sealing ring is an arc surface matching the outer ring surface of the inner ring sealing ring.

[0010] Furthermore, in the step of "marking the center of the through hole", the plug is cylindrical; the outer diameter of the outer cylindrical surface of the plug is larger than the inner diameter of the interfering threaded hole, so that the plug can be installed in the interfering threaded hole with interference; the outer cylindrical surface of the front section of the plug is processed to form a conical surface, so that the plug can be smoothly inserted into the interfering threaded hole; an eccentrically arranged and concave connecting hole is also processed on the rear end surface of the plug, which is used to pull the plug out of the interfering threaded hole after being connected to the pin puller.

[0011] Furthermore, in the step of "marking the center of the through hole", the sample punching equipment includes a punch for punching, and the punch includes an inner rod and an outer rod connected in sequence along the axial direction; the inner rod is used to be inserted into the through hole, and the front end of the inner rod is processed to form a punch tip for punching out a circular 0 on the plug, and the punch tip is quenched and hardened; the outer rod is located outside the through hole for connecting to the main body of the sample punching equipment.

[0012] Furthermore, the step of "marking the center of the through hole" specifically includes the following steps: passing the plug through the through hole and then installing it into the interfering threaded hole; installing the punch into the through hole and connecting the main body of the sample punching equipment with an external rod to punch out the center 0 of the through hole on the plug.

[0013] Furthermore, the step of "recording the center coordinates of the circle" specifically includes the following steps: separating the shield body blocks from the main drive or adapter tooling; installing and positioning a single shield body block on a processing machine tool, and recording the center coordinates 0 of circle 0; connecting the pin puller to the plug and pulling the plug out of the interfering threaded hole.

[0014] Furthermore, in the step of "repair processing and installation", the threaded sleeve is a hollow tube; the installation bottom hole is a threaded hole, and a fixed external thread connected to the installation bottom hole thread is processed on the outer circumferential surface of the threaded sleeve, and a connecting internal thread with the same size as the external thread is processed on the inner hole wall of the threaded sleeve.

[0015] Furthermore, the outer end of the threaded sleeve is processed to form a tapered groove, and an inwardly concave groove is also provided on the end face of the outer end of the threaded sleeve; in the step of "repair processing and installation", the threaded sleeve is also installed through an installation tool, and the installation tool includes a screw plate for inserting into the groove of the threaded sleeve, and a force handle connected to the screw plate.

[0016] Furthermore, the step of "repair processing and installation" specifically includes the following steps: according to the center coordinate 0, the interference threaded hole is expanded to form an installation bottom hole; a threaded sleeve is made; the installation tool is connected to the threaded sleeve, and after applying thread glue on the outer wall surface of the threaded sleeve, the installation tool is rotated to fix the threaded sleeve into the installation bottom hole; the groove and the groove at the end of the threaded sleeve are filled and welded, and the part of the threaded sleeve extending out of the end face of the shield body is removed by grinding and polishing.

[0017] The present invention has the following beneficial effects:

[0018] When the repair method of the present invention is used to repair the deformed and misaligned threaded holes on the shield body blocks, since several shield body blocks are first pieced together to find all the interfering threaded holes at the same time, and then the interfering threaded holes on each shield body block are repaired one by one, compared with the repair method of using a single block to find a hole in the prior art, it does not need to repeatedly piece the blocks together, so the repair efficiency is high, the labor intensity of the repair operation is low, and the risk of error accumulation is low; compared with the existing special machine drilling and tapping after the welding is filled and then pieced together, the repair method of the present invention is to first use the tool adaptation positioning and then mark the center position of the through hole, and then bore and mill the blocks, and finally inlay the threaded sleeve for repair. The hole position only needs to be bored and milled separately in a single block, and no surfacing welding is required. Therefore, the repair time is short, the repair efficiency is high, and the repair difficulty is low. It effectively solves the problems of large amount of surfacing welding, long time for shield body block rounding, and low overall processing efficiency in the existing repair process. Through the setting of the plug and the sample punching equipment, the center of the interference threaded hole can be quickly located, and the interference threaded hole of a single shield body block can be quickly repaired, which shortens the processing cycle and reduces the production cost. On the other hand, the threaded sleeve is processed to replace the defective interference threaded hole on the shield body block, which has the effect of reducing scrap loss, shortening the production cycle, and ensuring product quality. The entire repair operation is simple and the labor intensity is low.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the connection between the shield and the main drive;

[0022] Figure 2 It is a schematic diagram of the main structure of the plug;

[0023] Figure 3 It is a schematic diagram of the right view structure of the plug;

[0024] Figure 4 It is a schematic diagram of the main structure of the punch;

[0025] Figure 5 It is a schematic diagram of the main structure of the adaptation tooling;

[0026] Figure 6 yes Figure 5 AA-direction cross-sectional structural diagram;

[0027] Figure 7 yes Figure 5Schematic diagram of the cross-sectional structure in the middle BB direction;

[0028] Figure 8 It is a schematic diagram of the cross-sectional main view structure of the threaded casing;

[0029] Fig. 9 yes Figure 8 Schematic diagram of the structure viewed from above;

[0030] Fig.10 It is a schematic diagram of the main structure of the installation tooling;

[0031] Fig.11 It is a schematic diagram of the connection between the shield body and the adapter tooling.

[0032] Legend:

[0033] 11. Shield body blocks; 12. Threaded holes; 13. Main drive; 14. Through holes; 15. Long screw; 16. Inner circle sealing ring;

[0034] 2. Plug; 201. outer cylindrical surface; 202. conical surface; 203. connecting hole;

[0035] 3. Punch; 31. Inner extension rod; 32. Outer extension rod; 33. Punch tip;

[0036] 4. Adaptation tooling; 41. Adaptation ring; 411. Pin hole; 412. Lifting hole; 42. Positioning block;

[0037] 5. Threaded casing; 501. Fixed external thread; 502. Connecting internal thread; 503. Bevel; 504. Slot;

[0038] 6. Install the tooling; 61. Tighten the plate; 62. Apply force handle. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0040] Reference Figure 1 , Fig.11 The preferred embodiment of the present invention provides a shield threaded hole repair method for repairing the deformation and dislocation of the threaded hole 12 set inwardly on the end surface of the shield, comprising the following steps:

[0041] S10: Interference threaded hole marking: several shield body blocks 11 are assembled into a circle and assembled with the main drive 13 or the adapter 4 that replaces the main drive 13 to find out the threaded holes 12 that interfere with the through holes 14 on the main drive 13 or the through holes on the adapter 4, and mark them as interference threaded holes.

[0042] S20: Through hole center mark: A plug 2 for marking the center position of the corresponding through hole 14 is installed in each interfering threaded hole, and the center 0 of the corresponding through hole 14 is punched out on the plug 2 by a sample punching device.

[0043] S30: Recording the center coordinates: After the shield body block 11 is installed and positioned on the processing equipment to record the center coordinates of the center 0, the plug 2 is removed.

[0044] S40: Repair processing and installation: the interference threaded hole is expanded according to the center coordinate to form a mounting bottom hole, and the threaded sleeve 5 having the original threaded hole on the shield body block 11 is re-fixed in the mounting bottom hole.

[0045] When the repair method of the present invention is used to repair the deformed and misaligned threaded holes 12 on the shield body block 11, since a plurality of shield body blocks 11 are firstly assembled into a circle and all the interfering threaded holes are found at the same time, and then the interfering threaded holes on each shield body block 11 are repaired one by one, compared with the repair method of the prior art that uses a single block to find a hole by hole, it does not need to repeatedly assemble the blocks into a circle, so the repair efficiency is high, the labor intensity of the repair operation is low, and the risk of error accumulation is low; and compared with the existing surfacing welding filling and then assembling the circle and drilling and tapping the whole machine, the repair method of the present invention is to first use the tool adaptation positioning and then mark the center position of the through hole, and then boring and milling the blocks, and finally embedding the threaded sleeve 5 To repair the hole position, only a single block needs to be bored and milled separately, and no surfacing welding is required. Therefore, the repair time is short, the repair efficiency is high, and the repair difficulty is low. This effectively solves the problems of large surfacing amount, long shield body block rounding time, and low overall processing efficiency in the existing repair process. Through the setting of the plug 2 and the sample punching equipment, the center of the interference threaded hole can be quickly located, and the interference threaded hole of a single shield body block 11 can be quickly repaired, shortening the processing cycle and reducing the production cost. On the other hand, a threaded sleeve 5 is processed to replace the defective interference threaded hole on the shield body block 11, which has the effects of reducing scrap loss, shortening the production cycle, and ensuring product quality. In addition, the entire repair operation is simple and the labor intensity is low.

[0046] Alternatively, if Figure 5-7 As shown, in step "S10: interference threaded hole marking", the adapter tool 4 includes a hollow annular adapter ring 41. The end face of the adapter ring 41 is provided with a pin hole 411 that vertically penetrates the end face for positioning, a plurality of through holes that are sequentially spaced along the circumference and vertically penetrate the end face, and a plurality of hoisting holes 412 that are sequentially spaced along the circumference and vertically penetrate the end face for hoisting. The hoisting holes 412 are threaded holes that are used to connect with the hoisting equipment to hoist the adapter tool 4. When positioning, after the positioning pin is passed through the pin hole 411 on the adapter ring 41 and the corresponding pin hole on the shield body segment 11, a shield body segment 11 can be positioned with the adapter tool 4.

[0047] Preferably, if Figure 5-7 and Fig.11 As shown, the adapting tool 4 also includes a plurality of positioning blocks 42 for positioning the shield body block 11, and the plurality of positioning blocks 42 are connected to the end surface of the adapting ring 41 in a circumferential direction in sequence and at intervals. Each positioning block 42 extends to the lower side of the inner circle sealing ring 16 on the corresponding shield body block 11, and the inner wall surface of the positioning block 42 for fitting with the inner circle sealing ring 16 is an arc surface matching the outer ring surface of the inner ring sealing ring, so that the shield body block 11 is quickly positioned relative to the adapting ring 41 through the cooperation between the inner circle sealing ring 16 of the shield body block 11 and the positioning blocks 42 at the corresponding positions, thereby improving the positioning efficiency and accuracy.

[0048] In this optional solution, the specific operation of step "S10: interference threaded hole marking" is: first, several shield body blocks 11 are assembled into a circle, and then assembled with the main drive 13 or the through hole 14 on the adapter 4 using a long screw 15, and the through hole 14 and the threaded hole 12 in the threaded hole 12 where there is interference in the assembly are marked as interference threaded holes.

[0049] Alternatively, if Figure 2-3 As shown, in step "S20: Marking the center of the through hole", the plug 2 is cylindrical. The outer diameter of the outer cylindrical surface 201 of the plug 2 is larger than the inner diameter of the interfering threaded hole, so that the plug 2 can be installed in the interfering threaded hole with interference; in actual design, the outer diameter of the outer cylindrical surface 201 is about 50 threads larger than the bottom diameter of the interfering threaded hole. The outer cylindrical surface 201 of the front section of the plug 2 is processed to form a conical surface 202, so that the plug 2 can be smoothly inserted into the interfering threaded hole. An eccentrically arranged and concave connecting hole 203 is also processed on the rear end surface of the plug 2, which is used to pull the plug 2 out of the interfering threaded hole after connecting with the pin puller, and the eccentric setting of the connecting hole 203 is also used to avoid interference with the center of the through hole.

[0050] Alternatively, if Figure 4 As shown, in step "S20: through hole circle center mark", the sample punching equipment includes a punch 3 for punching, and the punch 3 includes an inner rod 31 and an outer rod 32 connected in sequence along the axial direction. The inner rod 31 is used to be inserted into the through hole 14, and the front end of the inner rod 31 is processed to form a punch tip 33 for punching out a circular shape 0 on the plug 2, and the punch tip 33 is quenched and hardened to punch out the correct hole position on the plug 2, thereby improving the accuracy of hole punching and the difficulty of punching. The outer rod 32 is located outside the through hole 14 for connection with the main body of the sample punching equipment. In this optional scheme, by inserting the punch 3 into the through hole 14, and the outer diameter of the inner rod 31 of the punch 3 is about 15 wires smaller than the inner diameter of the through hole 14, the punch 3 can accurately punch out the position of the center of the through hole 14 on the plug 2 under the action of the sample punching equipment body and the guiding action of the through hole 14, thereby improving the punching accuracy and punching operation reliability.

[0051] Optionally, step “S20: through hole center mark” specifically includes the following steps:

[0052] S201: Pass the plug 2 through the through hole 14 and install it into the interference threaded hole.

[0053] S202: Insert the punch 3 into the through hole 14 and connect the external rod 32 to the main body of the sample punching device to punch out the center 0 of the through hole 14 on the plug 2; specifically, adapt the punch 3 to the through hole 14 on the main drive 13 or the adapter tooling 4, and then connect the external rod 32 of the punch 3 to the main body of the sample punching device (the external rod 32 can also be directly hammered) to punch out the center 0 of the through hole 14 on the plug 2.

[0054] Optionally, step “S30: recording the center coordinates” specifically includes the following steps:

[0055] S301: Separate the shield body block 11 and the main drive 13 or the adapter tooling 4.

[0056] S302: Install and position a single shield body block 11 on a processing machine tool, and record the center coordinate 0 (x, y) of the circle 0; specifically, firstly, transfer the single shield body block 11 to a boring and milling machine for alignment of the machined surface, and then the machine tool records the center coordinate 0 (x, y) of the circle 0 punched out in the previous process.

[0057] S303: After the pin puller is connected to the plug 2, the plug 2 is pulled out from the interfering threaded hole, that is, the pin puller is connected to the connecting hole 203 on the plug 2, and then the plug 2 is pulled out of the interfering threaded hole.

[0058] Alternatively, if Figure 8-9 As shown, in step "S40: repair processing and installation", the threaded sleeve 5 is a hollow tube. The installation bottom hole is a threaded hole, and the outer circumferential surface 201 of the threaded sleeve 5 is processed with a fixed external thread 501 that is threadedly connected to the installation bottom hole, and the inner hole wall surface of the threaded sleeve 5 is processed with a connecting internal thread 502 with the same size as the external thread on the threaded hole 12.

[0059] Preferably, if Figure 8-10 As shown, the outer end of the threaded sleeve 5 is processed to form a tapered groove 503, and the end surface of the outer end of the threaded sleeve 5 is also provided with a concave groove 504; the groove 503 is used for subsequent surfacing to facilitate welding and fixing with the shield body block 11, and the groove 504 is used for the subsequent threaded sleeve 5 to be installed into the installation bottom hole by applying force through an external tool. In the step "repair processing and installation", the threaded sleeve 5 is also installed through the installation tool 6, and the installation tool 6 includes a screw plate 61 for inserting into the groove 504 of the threaded sleeve 5, and a force-applying handle 62 connected to the screw plate 61.

[0060] Optionally, step “S40: repair processing and installation” specifically includes the following steps:

[0061] S401: According to the center coordinates 0 (x, y), the interfering threaded hole is expanded to form a mounting bottom hole; specifically, according to the center coordinates 0 (x, y), the original M60 threaded hole 12 is expanded to form a Φ83.5 bottom hole, and then an integral thread milling cutter is used to mill a fixed internal thread M90*5.5 mounting bottom hole.

[0062] S402: Making a threaded sleeve 5; the fixed external thread 501 of the threaded sleeve 5 matches the processed fixed internal thread M90*5.5, the connecting internal thread 502 of the threaded sleeve 5 is the same as the thread of the original M60 threaded hole 12 before repair, and the end of the threaded sleeve 5 is provided with a groove 504 and an outer round C3 groove 503.

[0063] S403: Connect the installation tool 6 to the threaded sleeve 5, and after applying thread glue on the outer wall surface of the threaded sleeve 5, rotate the installation tool 6 to fix the threaded sleeve 5 into the installation bottom hole; specifically, match the screw plate 61 of the installation tool 6 with the slot 504 of the threaded sleeve 5, and apply thread glue on the fixed external thread 501, and tighten the threaded sleeve 5 into the hole with the fixed internal thread M90*5.5 by turning the force handle 62.

[0064] S404: fill and weld the groove 503 and the groove 504 at the end of the threaded sleeve 5, and grind and polish to remove the portion of the threaded sleeve 5 extending out of the end face of the shield body block 11; specifically, after the threaded sleeve 5 is installed, fill the gap between the groove 503 and the inner wall of the installation bottom hole and the groove 504, then weld to fix the threaded sleeve 5 to the installation bottom hole, make the groove 504 flat, and finally grind and polish to remove the portion of the threaded sleeve 5 extending out of the end face of the shield body block 11 to achieve a smooth and bright surface.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shield thread hole repair method, characterized in that: The method is used to repair the deformation and misalignment of a threaded hole (12) which is concavely arranged on the end surface of a shield body, and comprises the following steps: Interference threaded hole marking: several shield body blocks (11) are assembled into a circle and assembled with a main drive (13) or an adaptor (4) that replaces the main drive (13) to find out the threaded holes (12) that interfere with the through holes (14) on the main drive (13) or the through holes on the adaptor (4), and mark them as interference threaded holes; Through hole center mark: a plug (2) for marking the center position of the corresponding through hole (14) is installed in each interfering threaded hole, and the center 0 of the corresponding through hole (14) is punched out on the plug (2) by a sample punching device; Recording of center coordinates: installing and positioning the shield body block (11) on the processing equipment to record the center coordinates of the center 0 and then removing the plug (2); Repair processing and installation: the interference threaded hole is expanded according to the center coordinate to form a mounting bottom hole, and the threaded sleeve (5) with the original threaded hole on the shield body block (11) is re-fixed in the mounting bottom hole.

2. The shield thread hole repair method according to claim 1, characterized in that: In the step of "interference threaded hole marking", the adapter tool (4) includes a hollow annular adapter ring (41); The end surface of the adapter ring (41) is provided with a pin hole (411) vertically penetrating the end surface for positioning, a plurality of through holes arranged in sequence at intervals along the circumferential direction and vertically penetrating the end surface, and a plurality of hoisting holes (412) arranged in sequence at intervals along the circumferential direction and vertically penetrating the end surface for hoisting.

3. The shield thread hole repair method according to claim 2, characterized in that: The adapting tool (4) further comprises a plurality of positioning blocks (42) for positioning the shield body blocks (11), wherein the plurality of positioning blocks (42) are connected to the end surface of the adapting ring (41) in sequence and at intervals along the circumferential direction; Each positioning block (42) extends to the bottom of the inner circular sealing ring (16) on the corresponding shield body block (11), and the inner wall surface of the positioning block (42) for fitting with the inner circular sealing ring (16) is an arc surface matching the outer ring surface of the inner circular sealing ring.

4. The shield thread hole repair method according to claim 1, characterized in that: In the step "marking the center of the through hole", the plug (2) is cylindrical; The outer diameter of the outer cylindrical surface (201) of the plug (2) is larger than the inner diameter of the interfering threaded hole, so that the plug (2) is interference-fitted in the interfering threaded hole; The outer cylindrical surface (201) of the front section of the plug (2) is processed to form a conical surface (202) so that the plug (2) can be smoothly punched into the interfering threaded hole; An eccentrically arranged and inwardly concave connecting hole (203) is also processed on the rear end surface of the plug (2) for being used to pull the plug (2) out of the interfering threaded hole after being connected to a pin puller.

5. The shield thread hole repair method according to claim 1, characterized in that: In the step of "marking the center of the through hole", the sample punching device comprises a punch (3) for punching holes, and the punch (3) comprises an inner extension rod (31) and an outer connection rod (32) connected in sequence along the axial direction; The inner extension rod (31) is used to be inserted into the through hole (14), and the front end of the inner extension rod (31) is processed to form a punch tip (33) for punching out a circular O on the plug (2), and the punch tip (33) is quenched and hardened; The external connecting rod (32) is located outside the through hole (14) so ​​as to be connected to the main body of the sample punching device.

6. The shield thread hole repair method according to claim 5, characterized in that: The step "through hole center mark" specifically includes the following steps: Pass the plug (2) through the through hole (14) and install it into the interfering threaded hole; The punch (3) is inserted into the through hole (14) and the external rod (32) is connected to the main body of the sample punching device to punch out the center 0 of the through hole (14) on the plug (2).

7. The shield thread hole repair method according to claim 1, characterized in that: The step "recording the center coordinates of a circle" specifically includes the following steps: Separate the shield body block (11) from the main drive (13) or the adapter tool (4); Install and position a single shield body block (11) on a processing machine, and record the center coordinates 0 (x, y) of the circle 0; After the pin puller is connected to the plug (2), the plug (2) is pulled out from the interfering threaded hole.

8. The shield thread hole repair method according to claim 7, characterized in that: In the step "repair processing and installation", the threaded sleeve (5) is a hollow tube; The mounting bottom hole is a threaded hole, the outer circumferential surface (201) of the threaded sleeve (5) is processed with a fixed external thread (501) threadedly connected to the mounting bottom hole, and the inner hole wall surface of the threaded sleeve (5) is processed with a connecting internal thread (502) of the same size as the external thread (12).

9. The shield thread hole repair method according to claim 8, characterized in that: The outer end of the threaded sleeve (5) is processed to form a tapered groove (503), and the end surface of the outer end of the threaded sleeve (5) is also provided with an inwardly concave groove (504); In the step of "repair processing and installation", the threaded sleeve (5) is also installed through the installation tool (6), and the installation tool (6) includes a screw plate (61) for inserting into the slot (504) of the threaded sleeve (5), and a force-applying handle (62) connected to the screw plate (61).

10. The shield thread hole repair method according to claim 9, characterized in that: The step "repair processing and installation" specifically includes the following steps: According to the center coordinate 0 (x, y), the interfering threaded hole is expanded to form a mounting bottom hole; Making a threaded casing (5); Connect the installation tool (6) to the threaded sleeve (5), apply thread glue on the outer wall surface of the threaded sleeve (5), and then rotate the installation tool (6) to fix the threaded sleeve (5) into the installation bottom hole; The groove (503) and the groove (504) at the end of the threaded sleeve (5) are filled and welded, and the portion of the threaded sleeve (5) extending out of the end surface of the shield body block (11) is removed by grinding and polishing.

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