阅读说明：本技术 一种泥水平衡盾构机常压刀盘刀筒螺丝孔的修复方法 (Method for repairing screw hole of normal-pressure cutter head cutter barrel of slurry balance shield tunneling machine ) 是由 张玉宝 叶虎 王建 鲁和友 严淦 卢振勇 毛知新 侯保俊 何晓东 武金城 徐文博 于 2021-09-29 设计创作，主要内容包括：本发明公开了一种泥水平衡盾构机常压刀盘刀筒螺丝孔的修复方法,该方法包括：一、清理并固定待修复刀筒；二、安装定位工装；三、钻孔并拆除定位工装；四、修复待修复的螺丝孔；五、封堵修复好的螺丝孔。本发明将所述待修复刀筒反向固定在所述钻床上,从所述刀座固定端头的反面对待修复螺丝孔进行修复,维修工艺简单,避免了旧修复工艺造成的再次损坏维修和甚至造成刀筒报废的可能,可节约大量时间成本和资金成本；同时利用所述定位工装从所述刀座固定端头的反面对所述螺丝孔的位置进行确定,在不损伤所述待修复刀筒的前提下,增加了刀筒的可修复性,进一步增加刀筒的可靠性及使用寿命,减少后期施工风险。(The invention discloses a method for repairing a screw hole of a cutter drum of a normal-pressure cutter head of a slurry balance shield machine, which comprises the following steps: firstly, cleaning and fixing a to-be-repaired knife cylinder; secondly, installing a positioning tool; thirdly, drilling and dismantling the positioning tool; fourthly, repairing the screw hole to be repaired; and fifthly, plugging the repaired screw hole. According to the invention, the tool cylinder to be repaired is reversely fixed on the drilling machine, the screw hole to be repaired is repaired from the reverse side of the fixed end head of the tool apron, the maintenance process is simple, the possibility of damaging and repairing again and even scrapping the tool cylinder caused by the old repair process is avoided, and a large amount of time cost and capital cost can be saved; utilize simultaneously the location frock is followed the reverse side of blade holder fixed end is right the position of screw hole is confirmed, is not damaging under the prerequisite of treating to restore the sword section of thick bamboo, has increased the repairability of a sword section of thick bamboo, further increases the reliability and the life of a sword section of thick bamboo, reduces later stage construction risk.)

1. A method for repairing a screw hole of a cutter drum of a normal-pressure cutter of a slurry balance shield tunneling machine is characterized by comprising the following steps:

step one, cleaning and fixing a to-be-repaired knife cylinder: cleaning the outer surface of the knife cylinder to be repaired and the screw hole on the knife cylinder to be repaired; enabling a flange of the cutter cylinder to be repaired to face downwards and be placed on a drilling machine, adjusting the flatness of the cutter cylinder to be repaired to ensure that the flatness of the cutter cylinder to be repaired is not more than 0.5mm, and reversely fixing the cutter cylinder to be repaired on the drilling machine by utilizing a fixing piece;

step two, installing a positioning tool, wherein the process is as follows:

step 201, confirming the number and the positions of screw holes to be repaired on the tool apron fixing end (1), horizontally installing a lower positioning plate (3) at the bottom of the group of screw holes to be repaired, wherein the lower positioning plate (3) is arranged on the inner side of the tool apron fixing end (1) of the tool apron cylinder to be repaired; connecting the lower positioning plate (3) with the tool apron fixing end socket (1) by using a bolt; wherein the bolt is installed in the screw hole which does not need to be repaired;

202, vertically installing a connecting rod (6) in a lower installation hole (5) of the lower positioning plate (3), wherein an external thread is arranged at the end part of the connecting rod (6), and the bottom of the connecting rod (6) penetrates through the lower installation hole (5) and then is fixed on the bottom surface of the lower positioning plate (3) through a lower nut;

step 203, sleeving a protective sleeve (7) on each connecting rod (6), wherein the height of each connecting rod (6) is greater than that of each protective sleeve (7), and the height of each protective sleeve (7) is greater than the vertical distance between the lower positioning plate (3) and the top surface of the cutter holder fixing end (1);

step 204, horizontally installing an upper positioning plate (8) at the top of the protective sleeve (7), enabling the top of the connecting rod (6) to penetrate through an upper installation hole (9) of the upper positioning plate (8), and fixing the upper positioning plate (8) at the top of the protective sleeve (7) by using an upper nut (10);

step three, drilling and dismantling the positioning tool, wherein the process is as follows:

301, a plurality of upper positioning holes (2) are formed in the upper positioning plate (8), and the number of the upper positioning holes (2) is equal to that of the screw holes to be repaired in the tool apron fixing end (1) and corresponds to that of the screw holes to be repaired one by one; drilling the bottom of the tool apron fixing end (1) by using a drilling tool to penetrate through the upper positioning hole (2) according to the number and the position of the screw holes to be repaired determined in the step 201 to form a bottom hole; the bottom hole is communicated with a screw hole to be repaired on the fixed end socket (1) of the tool apron;

step 302, after drilling is completed, screwing a nut (10) and removing the upper positioning plate (8); then the protective sleeve (7) is removed, the lower nut is screwed, and the connecting rod (6) is removed; finally, screwing the bolt, and disassembling the lower positioning plate (3) to finish the disassembly of the positioning tool;

step four, repairing the screw hole to be repaired: reaming the bottom hole, and performing chamfering construction at the hole opening; tapping the processed bottom hole by using a screw tap, screwing a steel wire thread insert into the bottom hole after tapping is finished, so that the length of the steel wire thread insert entering the bottom hole is not less than 50mm, and the top of the steel wire thread insert is lower than the top surface of the fixed end (1) of the tool apron;

step five, plugging the repaired screw hole: a solid plug is placed into the bottom hole, and the length of the solid plug extending into the bottom hole is not less than 20 mm; and plugging the joint of the solid plug and the tool apron fixing end (1) of the tool barrel to be repaired.

2. The method for repairing screw holes of the cutter drum of the normal-pressure cutter of the slurry balance shield tunneling machine according to claim 1, which is characterized in that: in step 201, a plurality of lower positioning holes (4) for installing the bolts are formed in the lower positioning plate (3), and the number of the lower positioning holes (4) is equal to that of the upper positioning holes (2) and corresponds to that of the upper positioning holes one by one; and flat pads (13) are horizontally arranged between the lower positioning plate (3) and the cutter holder fixing end (1) and between the upper positioning plate (8) and the cutter holder fixing end (1).

3. The method for repairing screw holes of the cutter drum of the normal-pressure cutter of the slurry balance shield tunneling machine according to claim 1, which is characterized in that: a plurality of lower mounting holes (5) for mounting the connecting rods (6) are formed in the lower positioning plate (3), and the plurality of lower mounting holes (5) are distributed along the circumferential direction of the lower positioning plate (3); a plurality of upper mounting holes (9) matched with the lower mounting holes (5) are formed in the upper positioning plate (8), and the plurality of upper mounting holes (9) are distributed along the circumferential direction of the upper positioning plate (8).

4. The method for repairing screw holes of the cutter drum of the normal-pressure cutter of the slurry balance shield tunneling machine according to claim 2, characterized by comprising the following steps: the upper positioning plate (8) and the lower positioning plate (3) are respectively provided with a through hole (12) for a hydraulic wear probe (14) to pass through, and the through holes (12) are arranged in an area defined by the lower positioning holes (4) or an area defined by the upper positioning holes (2).

5. The method for repairing screw holes of the cutter drum of the normal-pressure cutter of the slurry balance shield tunneling machine according to claim 1, which is characterized in that: and gaskets (11) are respectively arranged between the upper positioning plate (8) and the upper nut (10) and between the lower positioning plate (3) and the lower nut.

6. The method for repairing screw holes of the cutter drum of the normal-pressure cutter of the slurry balance shield tunneling machine according to claim 1, which is characterized in that: and step five, when the joint of the solid plug and the tool apron fixing end (1) is plugged, glass cement can be adopted, or the solid plug and the tool apron fixing end (1) are welded and fixed.

Technical Field

The invention belongs to the technical field of shield machine maintenance, and particularly relates to a method for repairing a cutter drum screw hole of a normal-pressure cutter head of a slurry balance shield machine.

Background

The shield machine is used for tunneling in complex geology, the requirement on the operation level of a construction unit is high, and the durability of the shield machine is greatly tested. The cutter head of the shield machine bears the main work of tunnel excavation and bears huge vibration and pressure. These vibrations and pressure have all transmitted on the blade holder connecting bolt in the ordinary pressure sword section of thick bamboo, and the tunnelling in-process, cutter wearing and tearing and abnormal damage can not avoid, and blade holder fixing bolt can appear partly bolt looseness owing to vibrations and pressure and drop and disconnected silk, damages the interior silk of sword section of thick bamboo bolt hole, causes the condition that the sword section of thick bamboo can not be used.

The commonly used repair methods at present are: one is to carry out re-tapping on the damaged threads in the bolt holes, and the bolt holes processed by the method basically have the conditions of thread breakage and bolt unremovable in the using process; the other method is to perform reaming and tapping on the bolt hole and process and install the screw sleeve, and the method has the defects that the thickness of the screw sleeve is thick, the reaming diameter of the bolt hole is large, the wall thickness of the bolt hole in a partial area is thin, the screw sleeve cannot be repaired by a secondary method, and the screw sleeve is difficult to repair again when being damaged in the using process. Therefore, the traditional maintenance method needs to drill holes from the inside for maintenance, the drill rod needs more than one meter when the drill rod is repaired from the inside, the repaired hole is damaged, the maintenance is repeated, and the maintenance efficiency is low when the drill is modified when the drill rod is repaired.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for repairing a screw hole of a cutter cylinder of a normal-pressure cutter head of a slurry balance shield machine, aiming at the defects in the prior art, the cutter cylinder to be repaired is reversely fixed on a drilling machine, the screw hole to be repaired is repaired from the reverse side of the fixed end head of the cutter seat, the maintenance process is simple, the possibility of damaging and repairing the cutter cylinder again and even scrapping the cutter cylinder caused by the old repair process is avoided, and a large amount of time cost and capital cost can be saved; utilize simultaneously the location frock is followed the reverse side of blade holder fixed end is right the position of screw hole is confirmed, is not damaging under the prerequisite of treating to restore the sword section of thick bamboo, has increased the repairability of a sword section of thick bamboo, further increases the reliability and the life of a sword section of thick bamboo, reduces later stage construction risk.

In order to solve the technical problems, the invention adopts the technical scheme that: the method for repairing the screw hole of the cutter drum of the normal-pressure cutter head of the slurry balance shield tunneling machine is characterized by comprising the following steps of: the method comprises the following steps:

the method comprises the following steps:

step one, cleaning and fixing a to-be-repaired knife cylinder: cleaning the outer surface of the knife cylinder to be repaired and the screw hole on the knife cylinder to be repaired; enabling a flange of the cutter cylinder to be repaired to face downwards and be placed on a drilling machine, adjusting the flatness of the cutter cylinder to be repaired to ensure that the flatness of the cutter cylinder to be repaired is not more than 0.5mm, and reversely fixing the cutter cylinder to be repaired on the drilling machine by utilizing a fixing piece;

step two, installing a positioning tool, wherein the process is as follows:

step 201, confirming the number and the positions of screw holes to be repaired on the fixed end of the tool apron, and horizontally installing a lower positioning plate at the bottom of the group of screw holes to be repaired, wherein the lower positioning plate is arranged on the inner side of the fixed end of the tool apron of the tool holder to be repaired; connecting the lower positioning plate with the fixed end of the tool apron by using a bolt; wherein the bolt is installed in the screw hole which does not need to be repaired;

202, vertically installing a connecting rod in a lower installation hole of the lower positioning plate, wherein an external thread is arranged at the end part of the connecting rod, and the bottom of the connecting rod passes through the lower installation hole and then is fixed on the bottom surface of the lower positioning plate through a lower nut;

step 203, sleeving a protective sleeve on each connecting rod, wherein the height of each connecting rod is greater than that of each protective sleeve, and the height of each protective sleeve is greater than the vertical distance between the lower positioning plate and the top surface of the fixed end of the cutter holder;

step 204, horizontally installing an upper positioning plate at the top of the protective sleeve, enabling the top of the connecting rod to penetrate through an upper installation hole of the upper positioning plate, and fixing the upper positioning plate at the top of the protective sleeve by using an upper nut;

step three, drilling and dismantling the positioning tool, wherein the process is as follows:

301, a plurality of upper positioning holes are formed in the upper positioning plate, and the number of the upper positioning holes is equal to that of the screw holes to be repaired in the fixed end of the tool apron and corresponds to that of the screw holes to be repaired one by one; drilling the bottom of the tool apron fixing end by penetrating a drilling tool through the upper positioning hole according to the number and the position of the screw holes to be repaired determined in the step 201 to form a bottom hole; the bottom hole is communicated with a screw hole to be repaired on the fixed end of the tool apron;

step 302, after drilling is completed, screwing a nut, and removing the upper positioning plate; then the protective sleeve is dismantled, the lower nut is screwed, and the connecting rod is dismantled; finally, screwing the bolt, and removing the lower positioning plate to finish the removal of the positioning tool;

step four, repairing the screw hole to be repaired: reaming the bottom hole, and performing chamfering construction at the hole opening; tapping the machined bottom hole by using a screw tap, screwing a steel wire thread insert into the bottom hole after tapping is finished, so that the length of the steel wire thread insert entering the bottom hole is not less than 50mm, and the top of the steel wire thread insert is lower than the top surface of the fixed end of the tool apron;

step five, plugging the repaired screw hole: a solid plug is placed into the bottom hole, and the length of the solid plug extending into the bottom hole is not less than 20 mm; and plugging the joint of the solid plug and the tool apron fixing end of the tool barrel to be repaired.

The method for repairing the screw hole of the cutter drum of the normal-pressure cutter head of the slurry balance shield tunneling machine is characterized by comprising the following steps of: in step 201, a plurality of lower positioning holes for installing the bolts are formed in the lower positioning plate, and the number of the lower positioning holes is equal to that of the upper positioning holes and corresponds to that of the upper positioning holes one to one; and flat pads are horizontally arranged between the lower positioning plate and the tool apron fixing end and between the upper positioning plate and the tool apron fixing end.

The method for repairing the screw hole of the cutter drum of the normal-pressure cutter head of the slurry balance shield tunneling machine is characterized by comprising the following steps of: the lower positioning plate is provided with a plurality of lower mounting holes for mounting the connecting rods, and the plurality of lower mounting holes are distributed along the circumferential direction of the lower positioning plate; the upper positioning plate is provided with a plurality of upper mounting holes matched with the lower mounting holes, and the plurality of upper mounting holes are distributed along the circumferential direction of the upper positioning plate.

The method for repairing the screw hole of the cutter drum of the normal-pressure cutter head of the slurry balance shield tunneling machine is characterized by comprising the following steps of: the upper positioning plate and the lower positioning plate are both provided with through holes for the hydraulic wear probes to pass through, and the through holes are distributed in an area defined by the lower positioning holes or the upper positioning holes.

The method for repairing the screw hole of the cutter drum of the normal-pressure cutter head of the slurry balance shield tunneling machine is characterized by comprising the following steps of: and gaskets are respectively arranged between the upper positioning plate and the upper nut and between the lower positioning plate and the lower nut. The method for repairing the screw hole of the cutter drum of the normal-pressure cutter head of the slurry balance shield tunneling machine is characterized by comprising the following steps of: and fifthly, when the joint of the solid plug and the fixed end of the tool apron is plugged, glass cement can be adopted, or the solid plug and the fixed end of the tool apron are welded and fixed.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the tool cylinder to be repaired is reversely fixed on the drilling machine, the screw hole to be repaired is repaired from the reverse side of the fixed end head of the tool apron, the maintenance process is simple, the possibility of damaging and repairing again and even scrapping the tool cylinder caused by the old repair process is avoided, and a large amount of time cost and capital cost can be saved.

2. According to the tool holder, the position of the screw hole is determined from the reverse side of the fixed end of the tool holder by using the positioning tool, so that the repairability of the tool holder is improved on the premise of not damaging the tool holder to be repaired, the reliability and the service life of the tool holder are further improved, and the later-stage construction risk is reduced.

3. When the lower positioning plate is installed, the lower positioning plate is fixed by using the screw holes which do not need to be repaired, and the knife cylinder to be repaired is reasonably utilized on the premise of not additionally punching and increasing a separate fixing device, so that the repairing process is simplified, and the repairing efficiency is improved.

4. According to the invention, the height of the protective sleeve sleeved on each connecting rod is greater than the vertical distance between the lower positioning plate and the top surface of the cutter holder fixing end, so that the upper positioning plate and the cutter holder fixing end are not contacted, and the precision of the screw hole is ensured in the subsequent repair process of the screw hole.

5. The invention plugs the end part of the repaired screw hole, can prevent slurry entering the screw hole from being corroded, and prolongs the service life of the bolt and the steel wire thread insert.

In conclusion, the tool cylinder to be repaired is reversely fixed on the drilling machine, the screw hole to be repaired is repaired from the reverse side of the fixed end head of the tool apron, the maintenance process is simple, the possibility of damaging and repairing the tool cylinder again and even scrapping the tool cylinder caused by the old repair process is avoided, and a large amount of time cost and capital cost can be saved; utilize simultaneously the location frock is followed the reverse side of blade holder fixed end is right the position of screw hole is confirmed, is not damaging under the prerequisite of treating to restore the sword section of thick bamboo, has increased the repairability of a sword section of thick bamboo, further increases the reliability and the life of a sword section of thick bamboo, reduces later stage construction risk.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

Fig. 1 is a schematic view of the installation and positioning tool of the present invention in a construction state.

FIG. 2 is a schematic diagram showing the positional relationship among the upper positioning plate, the protective sleeve and the tool apron fixing end according to the present invention.

FIG. 3 is a schematic structural view of an upper positioning plate and a lower positioning plate of the present invention.

FIG. 4 is a flow chart of the present invention.

Description of reference numerals:

1, fixing an end socket of a tool apron; 2, positioning holes; 3, a lower positioning plate;

4, lower positioning holes; 5-lower mounting holes; 6-connecting rod;

7, protecting sleeve; 8, positioning a plate; 9-mounting holes;

10, screwing a nut; 11-a gasket; 12-a through hole;

13-flat cushion; 14-hydraulic wear probe.

Detailed Description

As shown in fig. 1 to 4, the method for repairing screw holes of a normal-pressure cutter head cutter drum of a slurry balance shield tunneling machine includes the following steps:

step one, cleaning and fixing a to-be-repaired knife cylinder: cleaning the outer surface of the knife cylinder to be repaired and the screw hole on the knife cylinder to be repaired; enabling a flange of the cutter cylinder to be repaired to face downwards and be placed on a drilling machine, adjusting the flatness of the cutter cylinder to be repaired to ensure that the flatness of the cutter cylinder to be repaired is not more than 0.5mm, and reversely fixing the cutter cylinder to be repaired on the drilling machine by utilizing a fixing piece;

step two, installing a positioning tool, wherein the process is as follows:

step 201, confirming the number and the positions of screw holes to be repaired on the fixed end socket 1 of the tool apron, and horizontally installing a lower positioning plate 3 at the bottom of the group of screw holes to be repaired, wherein the lower positioning plate 3 is arranged on the inner side of the fixed end socket 1 of the tool apron of the tool barrel to be repaired; connecting the lower positioning plate 3 with the tool apron fixing end 1 by using a bolt; wherein the bolt is installed in the screw hole which does not need to be repaired;

202, vertically installing a connecting rod 6 in a lower installation hole 5 of the lower positioning plate 3, wherein an external thread is arranged at the end part of the connecting rod 6, and the bottom of the connecting rod 6 passes through the lower installation hole 5 and then is fixed on the bottom surface of the lower positioning plate 3 through a lower nut;

step 203, sleeving a protective sleeve 7 on each connecting rod 6, wherein the height of each connecting rod 6 is greater than that of each protective sleeve 7, and the height of each protective sleeve 7 is greater than the vertical distance between the lower positioning plate 3 and the top surface of the tool apron fixing end 1;

step 204, horizontally installing an upper positioning plate 8 on the top of the protective sleeve 7, enabling the top of the connecting rod 6 to penetrate through an upper installation hole 9 of the upper positioning plate 8, and fixing the upper positioning plate 8 on the top of the protective sleeve 7 by using an upper nut 10;

step three, drilling and dismantling the positioning tool, wherein the process is as follows:

301, a plurality of upper positioning holes 2 are formed in the upper positioning plate 8, and the number of the plurality of upper positioning holes 2 is equal to the number of the screw holes to be repaired in the tool apron fixing end 1 and corresponds to the number of the screw holes to be repaired one by one; drilling the bottom of the tool apron fixing end 1 by using a drilling tool to penetrate through the upper positioning hole 2 according to the number and the position of the screw holes to be repaired determined in the step 201 to form a bottom hole; the bottom hole is communicated with a screw hole to be repaired on the fixed end socket 1 of the tool apron;

step 302, after drilling is completed, screwing up a nut 10, and removing the upper positioning plate 8; then the protective sleeve 7 is removed, the lower nut is screwed, and the connecting rod 6 is removed; finally, screwing the bolt, and removing the lower positioning plate 3 to finish the removal of the positioning tool;

step four, repairing the screw hole to be repaired: reaming the bottom hole, and performing chamfering construction at the hole opening; tapping the machined bottom hole by using a screw tap, screwing a steel wire thread insert into the bottom hole after tapping is finished, so that the length of the steel wire thread insert entering the bottom hole is not less than 50mm, and the top of the steel wire thread insert is lower than the top surface of the fixed end socket 1 of the tool apron;

step five, plugging the repaired screw hole: a solid plug is placed into the bottom hole, and the length of the solid plug extending into the bottom hole is not less than 20 mm; and plugging the joint of the solid plug and the tool apron fixing end 1 of the tool barrel to be repaired.

According to the invention, the tool cylinder to be repaired is reversely fixed on the drilling machine, the screw hole to be repaired is repaired from the reverse side of the tool apron fixing end 1, the maintenance process is simple, the possibility of damaging and repairing again and even scrapping the tool cylinder caused by the old repair process is avoided, and a large amount of time cost and capital cost can be saved.

According to the invention, the positioning tool is used for determining the position of the screw hole from the reverse side of the tool apron fixing end 1, so that the repairability of the tool cylinder is increased on the premise of not damaging the tool cylinder to be repaired, the reliability and the service life of the tool cylinder are further increased, and the later-stage construction risk is reduced.

When the lower positioning plate 3 is installed, the screw holes which do not need to be repaired are used for fixing, the knife cylinder to be repaired is reasonably used on the premise of not additionally punching and increasing a separate fixing device, the repairing process is simplified, and the repairing efficiency is improved.

According to the invention, the height of the protective sleeve 7 sleeved on each connecting rod 6 is larger than the vertical distance between the lower positioning plate 3 and the top surface of the to-be-repaired knife cylinder, so that the upper positioning plate 8 and the to-be-repaired knife cylinder are ensured not to be contacted, and the precision of the screw hole is ensured in the subsequent repair process of the screw hole.

The invention plugs the end part of the repaired screw hole, can prevent slurry entering the screw hole from being corroded, and prolongs the service life of the bolt and the steel wire thread insert.

During the in-service use, can be right treat that the surface of restoreing a sword section of thick bamboo clears up, clears up iron rust, impurity etc. in each screw hole simultaneously to the plane deformation to each screw hole department is polished, will after treating the clearance treat that the restoration sword section of thick bamboo is placed on the workstation of drilling machine, through the alignment flange, confirm treat the roughness of restoreing a sword section of thick bamboo, it is right to utilize last clamping device on the drilling machine treat that the restoration sword section of thick bamboo carries out the centre gripping fixed.

It should be noted that, connecting rod 6 is located down locating plate 3 with the cover is equipped with protective sheath 7 on the pole section between the top board 8, the restriction protective sheath 7 highly be in order to guarantee top board 8 with treat that repair a sword section of thick bamboo contactless, follow-up restoration the in-process of screw hole guarantees the precision of screw hole, preferably, connecting rod 6 surpasss treat that the vertical distance of the top surface of repairing a sword section of thick bamboo is 1 cm. Meanwhile, the protective sleeve 7 is installed to ensure that the upper positioning plate 8 and the lower positioning plate 3 are arranged in parallel, and the precision of the repaired screw hole is ensured on the other hand.

In actual use, when the bottom hole is reamed, the threaded hole of the cutter cylinder M27 in the front area is reamed to phi 27.8mm, the threaded hole of the cutter cylinder M24 in the center area is reamed to phi 24.9mm, the surface smoothness and roughness are 6.3 microns, and the position accuracy of the hole is ensured to meet the requirements of a drawing; when chamfering, the axial depth of the chamfer at the hole opening of the bottom hole is 3.5 mm; during tapping, the length of the tap needs to be larger than the thickness of the front end of the cutter barrel by 110 mm. Particularly, when the solid plug is installed, thread fastening glue can be poured into the bottom hole, so that the threaded connection between the solid plug and the bottom hole is prevented from loosening, and the solid plug is locked and cannot loosen.

As shown in fig. 3, in step 201, in the present embodiment, a plurality of lower positioning holes 4 for installing the bolts are formed in the lower positioning plate 3, and the number of the lower positioning holes 4 is equal to the number of the upper positioning holes 2 and corresponds to one another; flat pads 13 are horizontally arranged between the lower positioning plate 3 and the tool apron fixing end 1 and between the upper positioning plate 8 and the tool apron fixing end 1.

In actual use, the lower positioning plate 3 can be fixed in the tool cylinder to be repaired by combining the lower positioning hole 4 and the screw hole, so that a supporting foundation is provided for the subsequent installation of the positioning tool; meanwhile, the lower positioning plate 3 is installed through the existing screw hole in the tool cylinder to be repaired, so that the repairing steps are simplified, and the repairing efficiency is improved. A flat cushion 13 is horizontally arranged between the lower positioning plate 3 and the tool apron fixing end 1, so that the lower positioning plate 3 is prevented from directly contacting with the tool apron fixing end 1, and errors during repair can be reduced; the purpose of horizontally arranging the flat cushion 13 between the upper positioning plate 8 and the tool apron fixing end 1 is to avoid that the upper positioning plate 8 directly contacts with the tool apron fixing end 1, so that the error in repair can be reduced.

During the in-service use, the distribution condition of the screw hole on the blade holder fixed end 1 has two kinds, and in order to satisfy the repair condition of the screw hole of these two kinds of different distribution types, the location frock that uses under two kinds of distribution conditions is distinguished, and the difference lies in two kinds in the location frock lower locating hole 4 on the lower locating plate 3 with the position of last locating hole 2 on the last locating plate 8 is different, and the position of locating hole is confirmed according to the position of corresponding screw hole.

As shown in fig. 3, in the present embodiment, a plurality of lower mounting holes 5 for mounting the connecting rods 6 are formed in the lower positioning plate 3, and the plurality of lower mounting holes 5 are arranged along the circumferential direction of the lower positioning plate 3; the upper positioning plate 8 is provided with a plurality of upper mounting holes 9 matched with the lower mounting holes 5, and the plurality of upper mounting holes 9 are distributed along the circumferential direction of the upper positioning plate 8.

As shown in fig. 3, in the present embodiment, through holes 12 for allowing a hydraulic wear probe 14 to pass through are formed in both the upper positioning plate 8 and the lower positioning plate 3, and the through holes 12 are arranged in an area surrounded by the plurality of lower positioning holes 4 or an area surrounded by the plurality of upper positioning holes 2.

As shown in fig. 2, in the present embodiment, a spacer 11 is installed between the upper positioning plate 8 and the upper nut 10, and between the lower positioning plate 3 and the lower nut. In actual use, the spacer 11 is installed to prevent abrasion to the upper positioning plate 8.

In this embodiment, in the fifth step, when the joint between the solid plug and the tool apron fixing end 1 is plugged, glass cement may be used, or the solid plug and the tool apron fixing end 1 may be welded and fixed.

During practical use, the welding can be performed at the joint of the two, and the welding is finished and then is polished to be smooth, wherein the thickness of the surfacing is not less than 10 mm.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.