Adjustable broach slotting system and using method

Abstract

The invention discloses an adjustable broach slotting system and a using method, belongs to the field of civil engineering, and particularly relates to the field of wall surface slotting of the civil engineering. Comprising a pulling device, a cutting device, a lead screw and a power source. The pulling device is driven by a power source, the first end of the lead screw is fixedly connected with the pulling device, and the lead screw is driven by the pulling device to rotate around the axis. The second end of the lead screw is connected with a threaded hole in the cutting device in a matched mode. The cutting width of the cutting device can be adjusted; the traction cutting device penetrates through the foundation wall groove to cut the side face of the foundation wall groove. The wall groove capable of containing the threading pipe is constructed in the side wall of the foundation wall groove, the opening is narrower than that in the prior art, and the problems of surface defects of the facing layer, bulging and loosening of filler and collapse of the threading pipe are solved.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering, and particularly relates to the field of wall surface grooving in civil engineering. Background Art

[0002] In civil engineering projects, it is often necessary to bury pipelines on the wall surface, such as Figure 1 As shown, there are two junction boxes on the wall, requiring conduit to be buried between them. The wiring harness passes through the conduit to connect to the junction boxes. Conventional construction methods involve creating a wall groove between the junction boxes, both wider and deeper than the conduit diameter. The conduit is placed in the groove, and finally, plaster mortar is applied to the groove space between the conduit surface and the wall. After the mortar solidifies, a decorative layer is applied to the wall to beautify it, forming a wall finish.

[0003] The above process used in the prior art has the following three defects.

[0004] First, a large amount of mortar needs to be filled in the wall groove. The volume difference between the mortar in the groove and the mortar on the wall is large, which forms a large shrinkage stress at the edge of the groove, causing cracks in the wall finishing layer on the wall surface, affecting the appearance;

[0005] Secondly, the fixation of the wire conduit in the cable trough depends on the bonding strength between the mortar and the side of the wall trough. If the surface of the cable trough is not cleaned properly before filling with mortar, the bonding strength will be greatly affected. Over time, the filler in the wall trough and the wire conduit will produce strain under the influence of temperature and humidity, causing the filler to loosen, the wire conduit to be unstable, and even cause bulges on the wall surface.

[0006] Third, if the wall where the wire conduit is located is under normal pressure, such as burying the wire conduit in a groove in the ground (wall in a broad sense), filling the space between the wire conduit and the wall with mortar and solidifying it, the movement of people or the rolling of wheels will exert an alternating force on the mortar in the filling area. This force will be applied to the surface of the wire conduit, squeezing it. In extreme cases, such as when the filling mortar is not well bonded to the side of the groove, the groove is too wide, or the pressure is too high, the wire conduit will collapse and squeeze the internal wiring harness, causing electrical faults such as short circuits and open circuits.

[0007] The above is an explanation of the wire harness threading pipe in the prior art. In fact, a similar scenario is laying water pipes in the wall, and elbows or tees and other joints need to be installed at both ends of the water pipes.

[0008] In summary, the wall groove in the prior art is wider than the wire conduit, which causes problems such as surface defects of the finishing layer, bulging and loosening of the filler, and collapse of the wire conduit. Summary of the Invention

[0009] The present invention aims to solve the problem in the prior art that the wall groove is wider than the threading pipe, which causes surface defects of the finishing layer, bulging and loosening of the filling material and collapse of the threading pipe.

[0010] In order to achieve the above purpose, the scheme is as follows:

[0011] An adjustable broach grooving system is designed, including a pulling device, a cutting device, a screw rod and a power source; the pulling device is driven by the power source, the first end of the screw rod is fixedly connected to the pulling device, and the screw rod is driven by the pulling device to rotate around the axis; the second end of the screw rod is cooperatively connected with the threaded hole in the cutting device; the cutting width of the cutting device can be adjusted; the cutting device is pulled through the foundation wall groove to cut the side of the foundation wall groove.

[0012] Furthermore, a method for using the adjustable broach grooving system is characterized by comprising the following steps:

[0013] 1) The first foundation groove, the second foundation groove and the foundation wall groove connecting them are constructed on the wall surface; the width of the foundation wall groove is smaller than the diameter of the wire threading pipe;

[0014] 2) Connect the pulling device and the cutting device to the screw rod respectively;

[0015] 3) Place the pulling device in the first foundation groove, the cutting device in the second foundation groove, and the screw rod in the foundation wall groove;

[0016] 3) Adjust the pulling device to a depth within the wall so that the pulling force on the cutting device is parallel to the foundation wall groove;

[0017] 4) Connect the pulling device to the power source, pull the cutting device through the foundation wall groove, cut its side, and adjust the cutting width to form a space for accommodating the threading pipe.

[0018] The present invention constructs a wall groove capable of accommodating a wire conduit in the side wall of the foundation wall groove, and the opening is narrower than that of the prior art, thereby avoiding the problems of surface defects of the finishing layer, bulging and loosening of the filler, and collapse of the wire conduit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the present application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 The existing technology of slotting;

[0021] Figure 2 Schematic diagram of the foundation wall groove of the present invention;

[0022] Figure 3 Schematic diagram of the slotting process in Example 1 of the present application;

[0023] Figure 4 right Figure 3 Cut open the wall to hide the power source;

[0024] Figure 5 and 6 A three-dimensional diagram of the pulling device of embodiment 1;

[0025] Figure 7 Example 1 Cutting device cutaway view;

[0026] Figure 8 A three-dimensional diagram of a cutting device according to embodiment 1;

[0027] Figure 9 Example 1: Top view of the cutting device;

[0028] Figure 10 Schematic diagram of the cutting groove principle;

[0029] Figure 11 In the first embodiment, the pulling device accommodates the cutting device to cut beyond the travel, and the wall is split;

[0030] Figure 12 Illustration of putting the wire conduit into the wall groove after cutting;

[0031] Figure 13 and 14 Example 2: Cut open the wall to hide the power source;

[0032] Figure 15 Example 2: Schematic diagram of the principle of half-threaded hole;

[0033] Figure 16 and 17 Projection views along the axis of the semi-threaded hole and the axis of the semi-bright hole respectively;

[0034] Figure 18 Schematic diagram of the screw rod and semi-bright hole;

[0035] Figure 19 Schematic diagram of the screw rod and semi-threaded hole;

[0036] Figure 20 、 21 and 22 baffle structure schematic diagram;

[0037] Figure 23 In the second embodiment, the pulling device accommodates the over-cutting of the cutting device, and the wall is split;

[0038] Figure 24 Example 3 stereogram;

[0039] Figure 25 Example 3: A three-dimensional view in a wall, with the wall cut open;

[0040] Figure 26 Schematic diagram of the width adjustment of the cutting device in embodiment 3;

[0041] Figure 27 and 28Exploded view of the cutting device in Example 3;

[0042] Figure 29 and 30 Example 3 Schematic diagram of different width overtravel of cutting device, wall sectioning;

[0043] The following are marked in the figure:

[0044] 1. Pulling device; 11. Tension bracket; 12. Depth adjuster; 13. Pull rope; 131. Anti-disconnection; 14. Rope puller; 15. Support surface; 16. Output shaft; 17. Input shaft;

[0045] 2. Cutting device; 21. Cutting support; 211. Semi-threaded hole; 212. Semi-bright hole; 213. Stopper; 214. Slide; 215. Stop groove; 216. Indicator; 22. Control handle; 23. Broach; 231. Guide surface; 232. Cutting edge; 233. Chip flute; 234. Slide; 24. Baffle; 241. Long hole; 242. Fastener; 25. Cover; 251. Locking device; 26. Feeder; 262. Indicator;

[0046] 3. Screw;

[0047] 4. Power source. DETAILED DESCRIPTION

[0048] 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, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] For ease of expression and understanding, Figure 3 The present invention is shown as being placed inside a wall. Here, "upper" or "top" refers to the wall surface, and "interior" or "bottom" refers to the interior of the wall. The depth direction is from the interior of the wall to the wall surface, or from the wall surface to the interior of the wall. The width of the foundation wall groove is the lateral direction. This article uses the system operating in a horizontal wall (such as the ground) as an example. When the system is used on a vertical wall, ceiling, or other angled wall, the relative relationships between them remain unchanged.

[0050] like Figure 1 As shown in the figure, the existing technology of buried conduit operation method and existing problems are described, namely, there are problems such as surface defects of the finishing layer, bulging and loosening of the filler, and collapse of the conduit. Similar scenarios include laying water pipes in the wall, and elbows or tees need to be installed at both ends of the water pipes. In order to be compatible with these scenarios, Figure 2As shown, this article uses the first foundation groove and the second foundation groove as the conceptual expression of the junction box, which is the space opened in the wall to accommodate components such as the junction box and pipe joints, usually a rectangular parallelepiped.

[0051] like Figure 2 As shown, a first foundation groove and a second foundation groove are constructed in the same wall (a wall herein generally refers to a building surface such as a ceiling, wall, or floor) using existing technology. The two grooves are arranged opposite each other, that is, their adjacent surfaces are parallel. A foundation wall groove connecting the adjacent surfaces of the two grooves is constructed using existing grooving tools. The foundation wall groove has a rectangular cross-section and is open at the top. The bottom surface is higher than the bottom surfaces of the first and second foundation grooves. The width of the foundation wall groove is less than the outer diameter of the conduit (a conduit herein generally refers to the tubular object connecting the first and second foundation grooves).

[0052] Example 1, as Figures 2 to 12 shown.

[0053] like Figure 3 and Figure 4 As shown, the groove cutting system disclosed in the present invention includes a pulling device 1, a cutting device 2, and a power source 4. The pulling device 1 is driven by the power source 4, pulling the cutting device 2 through the foundation wall groove to cut the side of the foundation wall groove. The power source 4 can be integrated with the pulling device 1, or it can use a conventional power source, such as an electric drill, electric screwdriver, or other device that converts electrical energy into rotational mechanical energy, thereby reducing manufacturing costs by utilizing existing equipment.

[0054] like Figure 5 and Figure 6 As shown, the pulling device 1 includes a tension bracket 11, a pull rope 13, a rope puller 14 and a support surface 15; the middle part of the tension bracket 11 is fixedly connected to the rope puller 14, the first end of the pull rope 13 is connected to the rope puller 14, the second end of the pull rope 13 is connected to the cutting device 2, the rope puller 14 and the power source 4 are mechanically connected, and the power source 4 drives the rope puller 14 to pull the pull rope 13.

[0055] The side of the tension bracket 11 facing the cutting device 2 is in contact with the opening surface of the foundation wall groove of the first foundation groove; that is, the support surface 15 is in contact with the side of the first foundation groove close to the second foundation groove, and the reaction force borne by the tension bracket 11 when pulling the cutting device 2 is transmitted to the wall, playing a role of stable support; the projection of the pull rope 13 along the stretching direction falls within the area supported by the support surface 15; the pull rope 13 is located in the foundation wall groove and is consistent with its stretching direction; a depth adjuster is set on the top of the tension bracket 11 to adjust the position of the pull rope 13 in the foundation wall groove.

[0056] like Figure 5 and Figure 6As shown, the tension support 11 is a stretching body with an H-shaped cross-section along the depth direction, with a rectangular base plate in the middle. The first plate and the second plate are respectively arranged on the opposite sides of the base plate. The first plate and the second plate are parallel to each other, and the side facing the cutting device 2 is the support surface 15.

[0057] The rope puller 14 is fixedly connected to the base plate and is located on a side of the base plate facing away from the support surface 15 . A through hole is provided on the base plate, and the pull rope 13 passes through the through hole and enters the rope puller 14 .

[0058] The side of the base plate facing the support surface 15 has enough space to accommodate the cutting device 2 cutting overrun; Figure 11 As shown, when the cutting edge of the cutting device 2 is completely pulled out from the side of the foundation wall groove, it means that a cutting is completed. This requires the pulling device 1 to provide sufficient stroke to the cutting device 2. Since the space of the first foundation groove is limited, the structure of the pulling device 1 must be provided with space to accommodate the cutting overtravel state of the cutting device 2, similar to the concept of thread retreat groove and grinding wheel overtravel groove in mechanical processing; therefore, the tension bracket 11 is provided with a stretching body with an H-shaped cross-section along the depth direction, and the space facing the cutting device 2 is used to accommodate the overtravel of the cutting device 2.

[0059] At least three threaded holes are evenly distributed on the top of the first and second plates. The axis of the hole is consistent with the depth direction of the tension bracket 11, and is matched with a screw. The first end of the screw is provided with a hand screwdriver and the other end face is in contact with the wall. The purpose of the hand screwdriver is to facilitate tool-free operation, and fastener joints such as internal and external hexagonal screws can also be used, and can be operated using general tools.

[0060] The rope puller 14 includes a rope clamping device and a deceleration device; the rope clamping device is composed of two rollers with parallel rotating shafts, and the gap between them is smaller than the rope 13, which clamps the rope 13 and pulls the rope 13 as the rollers rotate; one of the balls is driven to rotate by the deceleration mechanism, and the input shaft of the deceleration mechanism is fixedly connected to the output end of the power source 4.

[0061] like Figure 3 and Figure 4 As shown, the power source 4 is an electric drill or an electric screwdriver, and its chuck clamps the input shaft of the rope puller 14 and is fixedly connected thereto; the rope puller 13 is a steel wire rope or a non-metallic rope with sufficient strength.

[0062] like Figure 7 and Figure 8 As shown, the cutting device 2 includes a cutting bracket 21, a control handle 22 and a broach 23; the first end face of the cutting bracket 21 facing the pulling device 1 is fixedly connected to the second end of the pull rope 13, and the cutting bracket 21 cuts the wall of the foundation wall groove as the pull rope 13 is pulled.

[0063] The top of the cutting bracket 21 is fixedly connected to the control handle 22, and the control handle 22 is located outside the wall surface; in this way, when the cutting device 2 is pulled into the foundation wall groove, the operator can control the control handle 22 from the front to make the cutting bracket 21 and the foundation wall groove in a relatively correct position. Preferably, the bottom of the cutting bracket 21 fits the bottom of the foundation wall groove.

[0064] A broach 23 is fixed to each side of the cutting bracket 21; the broaches 23 on both sides cut the corresponding side walls of the foundation wall groove, and achieve the desired width through one or more cutting (called broaching in the machinery industry) for laying the wire conduit.

[0065] The cutting bracket 21 is rectangular, and its length direction is consistent with the direction of the foundation wall groove. A through hole is set in the center along the length direction, penetrating the first end face and the second end face. The second end of the pull rope 13 passes through this through hole and is fixedly connected to the anti-disconnection 131. The outer diameter of the anti-disconnection 131 is larger than the inner diameter of the through hole. The anti-disconnection 131 can be formed by cold extrusion after being placed on the end of the pull rope 13. A countersunk hole is set on the second end face, and the anti-disconnection 131 is located in this countersunk hole, which helps to reduce the overall size of the cutting bracket 21. The width of the cutting bracket 21 is smaller than the width of the foundation wall groove, which is convenient for being placed in the foundation wall groove to pull and guide the broaches 23 on both sides of it for cutting.

[0066] like Figures 7 and 8 As shown, the control handle 22 consists of a cylindrical section and a handle. The first end of the cylindrical section is fixedly connected to the top of the cutting bracket 21, and the second end of the cylindrical section is fixedly connected to the handle. The outer diameter of the cylindrical section is smaller than the width of the foundation wall groove, and the length of the cylindrical section is greater than the depth of the foundation wall groove. The handle is oblong and is used for holding.

[0067] The two broaches 23 form a group, and are symmetrical with respect to a plane passing through both the pulling direction of the pull rope 13 and the axis of the cylindrical section of the control handle.

[0068] like Figure 8 and Figure 9 As shown, the broach 23 is a stretched body with a roughly rectangular cross-section along the depth direction, wherein the first side thereof is fixedly connected to the cutting bracket 21, the second side thereof is provided with a guide surface 231 close to the pulling device 1, and the second side thereof is provided with a cutting edge 232 away from the pulling device 1.

[0069] At least two rows of cutting edges 232 are provided, with the cutting edges 232 in the same row arranged at intervals, and the cutting edges 232 in different rows arranged in a staggered manner to form chip grooves 233. Specifically, the cross-section of the chip grooves 233 increases in the direction in which the cutting device 2 is working. In this way, the chips cut by the cutting edges 232 in the first row are squeezed into the adjacent chip grooves 233 and pressed backward. They are then cut and squeezed into the adjacent chip grooves 233 by the cutting edges 232 in the following row and pressed backward, forming a complete cutting surface and forming the required wall groove.

[0070] The cutting edge 232 is projected as a continuous straight line along the length direction of the cutting bracket 21; the width between the guide surfaces 231 of the two broaches 23 is slightly smaller than the width of the foundation wall groove; the width between the cutting edges 232 of the two broaches 23 is slightly larger than the diameter of the threading pipe.

[0071] Specifically, the guide surface 231 and the cutting edge 232 have a step difference in the lateral direction, i.e., the feed rate. Each time the wall of the foundation wall groove is cut, there is a small gap between the guide surface 231 and the wall of the foundation wall groove, and the cutting is stretched in the direction of the foundation wall groove. The wall groove formed after cutting can accommodate the passage of the wire tube. A limit setting is made here, that is, the feed rate of a single broach 23 is large enough and the foundation wall groove is wide enough. Only one stretching and cutting is required to achieve the desired wall groove width. The probability of this happening in practice is relatively low. In actual operation, it is necessary to gradually replace broaches 23 of various thicknesses and perform multiple operations to achieve the desired wall groove width.

[0072] like Figure 9 and Figure 10 As shown, the cutting bracket 21 can replace different groups of broaches 23; there are N groups of broaches 23, and the height difference between the guide surface 231 and the cutting edge 232 of each group is the same; the width between the two guide surfaces 231 of the broaches 23 of the N-1 group is slightly smaller than the width between the two cutting edges 232 of the broaches 23 of the previous group; the width between the two cutting edges 232 of the broaches 23 of the N group is slightly larger than the diameter of the threading pipe; N is equal to the quotient of the diameter of the threading pipe minus the width of the foundation wall groove divided by the height difference between each group of guide surfaces 231 and the cutting edge 232.

[0073] like Figure 11 and 12 As shown, the method for using the slotting system is characterized by comprising the following steps:

[0074] 1) The first foundation groove, the second foundation groove and the foundation wall groove connecting them are constructed on the wall surface; the width of the foundation wall groove is smaller than the diameter of the wire threading pipe;

[0075] 2) placing the cutting device 2 in the second foundation wall groove;

[0076] 3) Place the pulling device 1 in the first foundation wall groove and adjust the position so that the pulling force on the cutting device 2 is parallel to the foundation wall groove;

[0077] 4) Connect the pulling device 1 to the power source 4 and pull the cutting device 2 through the foundation wall groove;

[0078] 5) Replace the wider broach 23 in a progressive order and cut the side surface;

[0079] 6) Repeat steps 4 and 5 to obtain a wall groove of the desired width, forming space for the wire conduit.

[0080] Once step 4 is completed and the desired groove width is reached, step 5 can be omitted.

[0081] The wire threading pipe has a certain degree of deflection and a certain amount of deformation. The inner diameter of the processed wall groove is larger than the outer diameter of the wire threading pipe. The wire threading pipe passes through the processed wall groove from the first basic groove or the second basic groove.

[0082] Example 2, as Figure 3 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 12 and Figures 13 to 23 Based on the first embodiment, the driving of the feeding mechanism is changed from a pull rope to a screw drive, and a fast operation structure is added for fast separation and engagement.

[0083] The slotting system disclosed in the present invention includes a pulling device 1, a cutting device 2, a screw 3 and a power source 4; the pulling device 1 is driven by the power source 4, the first end of the screw 3 is fixedly connected to the pulling device 1, and the screw 3 is driven by the pulling device 1 to rotate around the axis; the second end of the screw 3 is connected to the threaded hole in the cutting device 2, and only a part of the wall of the threaded hole is threaded, and the threaded hole has space for the screw 3 to swing around the depth direction; the screw 3 has two positions in the threaded hole, one of which is that the screw 3 and the thread of the threaded hole cooperate to realize the transmission of the thread pair; the other is that the screw 3 is out of contact with the thread of the threaded hole; the pulling and cutting device 2 passes through the foundation wall groove to cut the side of the foundation wall groove. The screw 3 is an oblong body with a thread set on the outer circumference, preferably a single-start thread, and optionally a multi-start thread.

[0084] In the scenario of processing wall grooves, the distance between the first foundation wall groove and the second foundation wall groove is random, and the length of the screw rod 3 prepared by the grooving system is limited. The solution that can be adopted is to select a standard screw rod for the screw rod 3. The screw rod is easy to obtain and low-cost in the field of civil engineering. It is usually used in scenarios such as connecting the exterior decorative panels of the ceiling and fixing the formwork. The length of the screw rod is long enough, usually more than 4 meters, which is enough to cover the actual scene, and the screw rod of the corresponding length is cut for use.

[0085] like Figure 13 and 14 As shown, the pulling device 1 includes a tension support 11, a depth adjuster 12, a support surface 15, an output shaft 16 and an input shaft 17; the output shaft 16 and the input shaft 17 are rotationally connected to the tension support 11, the first end of the input shaft 17 is fixedly connected to the power source 4, the second end of the input shaft 17 is transmission-connected to the first end of the output shaft 16, and the second end of the output shaft 16 is fixedly connected to the first end of the screw rod 3; the surface of the tension support 11 facing the cutting device 2 is the support surface 15; a depth adjuster is provided on the top of the tension support 11 to adjust the position of the screw rod 3 in the foundation wall groove.

[0086] The tension bracket 11 is a stretching body with a concave cross-section in the depth direction, with a rectangular base plate in the middle. The first plate and the second plate are respectively arranged on the opposite sides of the base plate. The first plate and the second plate are parallel to each other, and the side facing the cutting device 2 is the support surface 15; the support surface 15 is in contact with the side of the first basic groove close to the second basic groove, and the reaction force borne by the tension bracket 11 when pulling the cutting device 2 is transmitted to the wall, playing a role of stable support; the projection of the screw rod 3 along the tensile direction falls within the area supported by the support surface 15.

[0087] The base plate is provided with a base through hole, the axial direction of which is parallel to the length direction of the base wall groove; a boss through hole is provided on the surface of the base plate away from the support surface 15 along the depth direction.

[0088] The first end of the output shaft 16 is a bevel gear, and the second end of the output shaft 16 is a cylinder coaxial with the bevel gear at the first end. The outer circumferential surface of the cylinder is rotatably connected to the basic through-hole of the basic plate, and a threaded hole is provided inwardly on the end surface of the cylindrical surface, and this threaded hole is threadedly connected to the first end of the screw rod 3; the first end of the input shaft 17 is rotatably linked to the boss through-hole and exposed to the wall, and the second end of the input shaft 17 is a bevel gear meshing with the bevel gear at the first end of the output shaft 16; their transmission ratio is not less than 1, the purpose is to provide sufficient cutting pulling force for the power of the power source 4 through the action of the speed reduction torque, and on the other hand, it also reduces the torque requirement of the power source 4 and increases the selection range of the power source 4.

[0089] The side of the base plate facing the support surface 15 has enough space to accommodate the cutting device 2 cutting overrun, such as Figure 23 As shown, the cutting edge of the cutting device 2 is completely pulled out from the side of the foundation wall groove, which means that a cutting is completed. This requires the pulling device 1 to provide sufficient travel to the cutting device 2. Since the space of the first foundation groove is limited, the tension bracket 11 is set facing the space of the cutting device 2 to accommodate the overtravel of the cutting device 2.

[0090] At least three threaded holes are evenly distributed on the top of the first plate and the second plate. The axis of the hole is consistent with the depth direction of the tension bracket 11. A screw rod is matched with it. The first end of the screw rod is provided with a hand screw and the other end face is in contact with the wall.

[0091] like Figure 3 、 Figure 13 and Figure 14 As shown, the power source 4 is an electric drill or an electric screwdriver, the chuck of which clamps the first end of the input shaft 17 .

[0092] The rotation direction of the screw rod 3 and the rotation direction of its own thread need to be defined to prevent the screw rod 3 and the second end of the output shaft 16 from loosening during operation.

[0093] When observing the pulling device 1 from the direction of the cutting device 2, the output shaft 16 rotates counterclockwise, the screw rod 3 is a right-handed thread, and the threaded hole of the cutting device 2 is also configured as an internal thread that engages with the right-handed thread of the screw rod 3. Alternatively, the output shaft 16 rotates clockwise, the screw rod 3 is a left-handed thread, and the threaded hole of the cutting device 2 is also configured as an internal thread that engages with the left-handed thread of the screw rod 3. With this design, the input shaft 16 and the screw rod 3 will be tightened against each other under the action of the rotational torque and will not disengage, and the rotational action will pull the cutting device 2 closer to the pulling device 1. Another idea is to install a set screw on the outside of the input shaft or insert a pin to securely connect the input shaft 16 and the screw rod 3, so that they will not disengage regardless of the direction of rotation.

[0094] like Figure 15 、 Figure 16 and Figure 17 As shown, the cutting device 2 includes a cutting bracket 21, a semi-threaded hole 211, a semi-bright hole 212, a control handle 22 and a broach 23; the cutting bracket 21 is a stretching body with a rectangular cross-section along the length direction of the foundation wall groove, and its width is less than the width of the foundation wall groove; there is a through hole in the center of the cutting bracket 21 along its stretching direction, and this hole is composed of two holes merged; one is a threaded hole whose axis coincides with the center of the cutting bracket 21 along its stretching direction; the other is a circular through hole, the diameter of which is not less than the major diameter of the screw rod 3, and its axis intersects with the axis of the threaded hole. The plane formed by the two axes is parallel to the bottom surface of the foundation wall groove, and the intersection is projected into the cutting bracket 21 along the depth direction, and the axis of the circular through hole intersects with the axis of the threaded hole to form an acute angle; the axis formed by the intersection along the depth direction is the rotating axis, and the circular through hole is swept around the rotating axis toward the threaded hole to remove part of the thread, and the sweeping angle is less than the angle between the axis of the circular through hole and the axis of the threaded hole. That is, the screw rod 3 is introduced into the cutting bracket 21 from the direction of the semi-bright hole axis, and then swings to a position coaxial with the semi-threaded hole axis to achieve engagement with its internal thread.

[0095] The top of the cutting bracket 21 is fixedly connected to the control handle 22 , and the control handle 22 is located outside the wall. A broach 23 is fixedly connected to each of the two side surfaces of the cutting bracket 21 .

[0096] like Figures 18 to 22 As shown, under the control of the control handle 22 and the constraint of the inner wall of the foundation wall groove on the cutting device 2, the screw rod 3 can engage with the semi-threaded hole 211 for transmission, but in order to reduce the dependence on the above factors, a baffle 24 is provided, one of which is fixedly connected to the side of each of the two exits of the semi-bright hole 212 of the cutting bracket 21 to prevent the screw rod 3 from radially disengaging from the semi-threaded hole 211.

[0097] The baffle 24 has two positions, one is the blocking position and the other is the release position; the cutting bracket 21 is provided with a recessed space along the depth direction on the side of the light hole 212 outlet, and a threaded hole is provided on the bottom of the recessed space. The side of this space forms a step with the cutting bracket 21, and the side of the baffle 24 fits with the step. The baffle 24 is provided with a long hole 241, and the fastener 242 passes through the long hole 241 and cooperates with the threaded hole on the bottom of the recessed space to fix the baffle 24 and the cutting bracket 21; the side surface of the upper part of the baffle 24 contacts the major diameter of the thread of the screw rod 3 engaged in the semi-threaded hole 211, and is in the blocking position; the baffle 24 moves upward along the length direction of the long hole 241 and rotates around the axis of the fastener 242, and the upper part of the baffle 24 is out of contact with the screw rod 3 and is in the release position.

[0098] like Figure 19 and Figure 20 As shown, the control handle 22 consists of a cylindrical section and a handle. The first end of the cylindrical section is fixedly connected to the top of the cutting bracket 21, and the second end of the cylindrical section is fixedly connected to the handle. The outer diameter of the cylindrical section is smaller than the width of the foundation wall groove, and the length of the cylindrical section is greater than the depth of the foundation wall groove. The handle is oblong and is used for holding.

[0099] The two broaches 23 form a set, and are symmetrical about a plane passing through both the axis of the semi-threaded hole 211 and the axis of the cylindrical section of the control handle.

[0100] like Figure 3 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 18 As shown, the broach 23 is the same as that in Example 1. The broach 23 is a stretched body with a roughly rectangular cross-section along the depth direction. Its first side surface is fixedly connected to the cutting bracket 21, and a guide surface 231 is provided on its second side surface close to the pulling device 1, and a cutting edge 232 is provided on its second side surface away from the pulling device 1; the cutting edges 232 are provided in at least two rows, the cutting edges 232 in the same row are arranged at intervals, and the cutting edges 232 in different rows are staggered to form a chip groove 233; the cutting edge 232 is projected along the length direction of the cutting bracket 21 to be a continuous straight line; the width between the guide surfaces 231 of the two broaches 23 is slightly smaller than the width of the foundation wall groove; the width between the cutting edges 232 of the two broaches 23 is slightly larger than the diameter of the wire threading pipe.

[0101] The cutting bracket 21 can be replaced with different groups of broaches 23; there are N groups of broaches 23, and the height difference between the guide surface 231 and the cutting edge 232 of each group is the same; the width between the two guide surfaces 231 of the N-1 group of broaches 23 is slightly smaller than the width between the two cutting edges 232 of the previous group of broaches 23; the width between the two cutting edges 232 of the Nth group of broaches 23 is slightly larger than the diameter of the threading pipe; N is equal to the quotient of the diameter of the threading pipe minus the width of the foundation wall groove divided by the height difference between each group of guide surfaces 231 and the cutting edge 232.

[0102] The method for using the slotting system is characterized by comprising the following steps:

[0103] 1) The first foundation groove, the second foundation groove and the foundation wall groove connecting them are constructed on the wall surface; the width of the foundation wall groove is smaller than the diameter of the wire threading pipe;

[0104] 2) Connect the pulling device 1 and the cutting device 2 to the screw rod 3 respectively;

[0105] 3) Place the pulling device 1 in the first foundation groove, the cutting device 2 in the second foundation groove, and the screw rod 3 in the foundation wall groove;

[0106] 4) Adjust the pulling device 1 to a depth within the wall so that the pulling force on the cutting device 2 is parallel to the foundation wall groove;

[0107] 5) Connect the pulling device 1 to the power source 4 and pull the cutting device 2 through the foundation wall groove;

[0108] 6) Replace the wider broach 23 in a progressive order and cut the side surface;

[0109] 7) Repeat steps 4, 5, and 6 to obtain a wall groove of the desired width, forming space for the wire conduit.

[0110] Once step 4 is completed and the desired groove width is achieved, steps 5 and 6 can be omitted.

[0111] Example 3, as Figure 3 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 and Figures 24 to 30 Based on the second embodiment, the cutting width of the cutting device 2 is designed to be adjustable.

[0112] The slotting system disclosed in the present invention comprises a pulling device 1, a cutting device 2, a screw rod 3 and a power source 4;

[0113] The pulling device 1 is driven by a power source 4, the first end of the screw rod 3 is fixedly connected to the pulling device 1, and the screw rod 3 is driven by the pulling device 1 to rotate around the axis; the second end of the screw rod 3 is cooperated with the threaded hole in the cutting device 2; the cutting width of the cutting device 2 can be adjusted; the pulling cutting device 2 passes through the foundation wall groove to cut the side of the foundation wall groove.

[0114] like Figure 13 、 Figure 14 、 Figure 24 and Figure 25As shown, the pulling device 1 includes a tension support 11, a depth adjuster 12, a support surface 15, an output shaft 16 and an input shaft 17; the output shaft 16 and the input shaft 17 are rotationally connected to the tension support 11, the first end of the input shaft 17 is fixedly connected to the power source 4, the second end of the input shaft 17 is transmission-connected to the first end of the output shaft 16, and the second end of the output shaft 16 is fixedly connected to the first end of the screw rod 3; the surface of the tension support 11 facing the cutting device 2 is the support surface 15; a depth adjuster is provided on the top of the tension support 11 to adjust the position of the screw rod 3 in the foundation wall groove.

[0115] The tension support 11 is a tensile structure with a concave cross-section along the depth direction. It has a rectangular base plate in the center. Opposite sides of the base plate are provided with a first plate and a second plate, which are parallel to each other. The side facing the cutting device 2 is a support surface 15. The base plate is provided with a base through-hole, the axis of which is parallel to the length of the foundation wall groove. The surface of the base plate away from the support surface 15 is provided with a boss through-hole along the depth direction.

[0116] The first end of output shaft 16 is a bevel gear. The second end of output shaft 16 is a cylindrical body coaxial with the bevel gear at the first end. The outer circumference of the cylinder is rotatably connected to the base through-hole of the base plate. A threaded hole is provided inwardly on the end surface of the cylinder, which is threadedly connected to the first end of screw rod 3. The first end of input shaft 17 is rotatably connected to the boss through-hole and exposed to the wall. The second end of input shaft 17 is a bevel gear that meshes with the bevel gear at the first end of output shaft 16. The transmission ratio between them is no less than 1. The side of the base plate facing support surface 15 has sufficient space to accommodate the overcutting of cutting device 2.

[0117] At least three threaded holes are evenly distributed on the top of the first plate and the second plate. The axis of the hole is consistent with the depth direction of the tension bracket 11. A screw rod is matched with it. The first end of the screw rod is provided with a hand screw and the other end face is in contact with the wall.

[0118] like Figure 3 、 Figure 13 and Figure 14As shown, power source 4 is an electric drill or electric screwdriver, whose chuck clamps the first end of input shaft 17. The rotation direction of screw rod 3 and its own thread must be defined to prevent screw rod 3 from loosening from the second end of output shaft 16 during operation. When viewing pulling device 1 from the direction of cutting device 2, if output shaft 16 rotates counterclockwise, screw rod 3 is right-handed, and the threaded hole of cutting device 2 is configured as an internal thread that engages with the right-handed thread of screw rod 3. Alternatively, if output shaft 16 rotates clockwise, screw rod 3 is left-handed, and the threaded hole of cutting device 2 is configured as an internal thread that engages with the left-handed thread of screw rod 3. This design tightens input shaft 16 and screw rod 3 under rotational torque, preventing them from disengaging. The rotational action also pulls cutting device 2 toward pulling device 1. Another approach is to secure input shaft 16 and screw rod 3 by installing a set screw or pin on the outside of the input shaft, preventing them from disengaging regardless of the direction of rotation.

[0119] like Figures 26 to 28 As shown, the cutting device 2 includes a cutting support 21 , a broach 23 , a cover plate 25 and a feeder 26 . The broach 23 includes a slide bar 234, the center of which has a threaded hole, and the axis of the threaded hole is parallel to the length direction of the slide bar 234; the cutting bracket 21 is a stretching body with a rectangular cross-section along the length direction of the foundation wall groove, and its width is less than the width of the foundation wall groove; the top of the cutting bracket 21 is fixedly connected to the control handle 22, and the control handle 22 is located outside the wall; the center of the cutting bracket 21 has a through hole along its stretching direction, which is a threaded hole and cooperates with the screw rod 3 for transmission; a slide groove 214 is provided on the upper and lower end faces of the cutting bracket 21, and the slide bar 234 of the broach 23 slides in the slide groove 214, and the above-mentioned two slide grooves 214 are symmetrical about the axis of the through hole in the center of the cutting bracket 21 along its stretching direction; when the slide bar 234 of the broach 23 slides in the slide groove 214 toward the pulling device 1, it moves away from the center threaded hole of the cutting bracket 21; a stop groove 215 is provided on the side wall of the end of the slide groove 214 away from the pulling device 1.

[0120] The first end of the feeder 26 is a screw rod that is in transmission engagement with the threaded hole of the slide bar 234. The second end of the feeder 26 is a circular protruding ring that is placed in the retaining groove 215. A special-shaped hole is provided on the outer side of the protruding ring.

[0121] The circumferential surface of the protruding ring is provided with an indicator 262, which is a line evenly distributed on the circumferential surface of the protruding ring; the position of the cutting bracket 21 closest to the protruding ring is provided with an indicator mark 216;

[0122] The cover plate 25 covers the opening of the slide groove 214 and is fixedly connected to the cutting bracket 21; the cover plate 25 is provided with a threaded through hole, which faces the side of the slide bar, and the locker 251 is a set screw that cooperates with the threaded through hole.

[0123] Use a general tool, such as a hexagonal wrench, to fit the above-mentioned special-shaped hole and rotate the feeder 26. The annular protruding ring of the feeder 26 is axially restricted by the stop groove 215, so that the slide bar can be driven to move axially. When it moves to the desired width, tighten the locker 251 to achieve the fixed connection between the broach 23 and the cutting bracket 21.

[0124] To easily determine the feed rate of the broach 23 when rotating the feeder 26, the feed rate can be inferred by observing the number of revolutions of the indicator 262 relative to the indicator mark 216. During operation, ensure that the feed rate of both broaches 23 is the same to ensure symmetry and avoid uneven force on both sides during pulling and cutting. If the feeder 26 is not available or the broach 23 needs to be measured from its center after multiple uses, a common measuring tool, such as a ruler or vernier caliper, can be used to measure the distance between the cutting edge and the side of the cutting support 21.

[0125] like Figure 3 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 26 As shown, the guide surface 231, cutting edge 232 and chip groove 233 of the broach 23 are the same as those in the first embodiment. The broach 23 includes a guide surface 231, a cutting edge 232 and a chip groove 233; the broach 23 is a roughly rectangular cross-section stretched body along the depth direction, the first side surface of which is fixedly connected to the first end of the slide 234, and the center of the second end surface of the slide 234 has a threaded hole, and the axis of the threaded hole is parallel to the length direction of the slide 234; the second side surface of the broach 231 is provided near the position of the pulling device 1, and the broach 233 is provided with a guide surface 231. A cutting edge 232 is provided at a position on the second side surface away from the pulling device 1; the cutting edges 232 are provided in at least two rows, the cutting edges 232 in the same row are arranged at intervals, and the cutting edges 232 in different rows are staggered to form a chip groove 233; the slide bar 234 stays at any position of the slide groove 214, and the cutting edge 232 is projected as a continuous straight line along the length direction of the cutting bracket 21; the cutting edge 232 protrudes from the guide surface 231; the two broaches 23 are symmetrical about the axis of the through hole in the center of the cutting bracket 21 along its stretching direction.

[0126] like Figure 27 and Figure 28 As shown, the control handle 22 consists of a cylindrical section and a handle. The first end of the cylindrical section is fixedly connected to the top of the cutting bracket 21, and the second end of the cylindrical section is fixedly connected to the handle. The outer diameter of the cylindrical section is smaller than the width of the foundation wall groove, and the length of the cylindrical section is greater than the depth of the foundation wall groove. The handle is oblong and is used for holding.

[0127] like Figure 15 and Figure 27As shown, the cutting bracket 21 includes a semi-threaded hole 211 and a semi-bright hole 212, which are the same as those in Example 2; there is a through hole in the center of the cutting bracket 21 along its stretching direction, and this hole is composed of two holes merged; one is a threaded hole whose axis coincides with the center of the cutting bracket 21 along its stretching direction; the other is a circular through hole, the diameter of which is not less than the major diameter of the screw rod 3, and its axis intersects with the axis of the threaded hole. The plane formed by the two axes is parallel to the bottom surface of the foundation wall groove, and the intersection is projected into the cutting bracket 21 along the depth direction, and the axis of the circular through hole intersects with the axis of the threaded hole to form an acute angle; the axis formed by the intersection along the depth direction is the rotation axis, and the circular through hole is swept around the rotation axis toward the threaded hole to remove part of the thread, and the sweeping angle is less than the angle between the axis of the circular through hole and the axis of the threaded hole.

[0128] The baffle 24 includes a baffle 24, which is fixedly connected to the side of each of the two exits of the semi-light hole 212 of the cutting bracket 21; the baffle 24 has two positions, one of which is a blocking position and the other is a release position; the cutting bracket 21 is provided with a recessed space along the depth direction on the side of the light hole 212 exit, and a threaded hole is provided on the bottom of the recessed space. The side of this space forms a step with the cutting bracket 21, and the side of the baffle 24 fits with the step. The baffle 24 is provided with a long hole 241, and the fastener 242 passes through the long hole 241 and cooperates with the threaded hole on the bottom of the recessed space to fix the baffle 24 and the cutting bracket 21; the side surface of the upper part of the baffle 24 contacts the major diameter of the thread of the screw rod 3 engaged in the semi-threaded hole 211, and is in the blocking position; the baffle 24 moves upward along the length direction of the long hole 241 and rotates around the axis of the fastener 242, and the upper part of the baffle 24 is disengaged from the screw rod 3 and is in the release position.

[0129] The method for using the slotting system is characterized by comprising the following steps:

[0130] 1) The first foundation groove, the second foundation groove and the foundation wall groove connecting them are constructed on the wall surface; the width of the foundation wall groove is smaller than the diameter of the wire threading pipe;

[0131] 2) Connect the pulling device 1 and the cutting device 2 to the screw rod 3 respectively;

[0132] 3) Place the pulling device 1 in the first foundation groove, the cutting device 2 in the second foundation groove, and the screw rod 3 in the foundation wall groove;

[0133] 3) Adjust the depth of the pulling device 1 in the wall so that the pulling force on the cutting device 2 is parallel to the foundation wall groove;

[0134] 4) Connect the pulling device 1 to the power source 4, pull the cutting device 2 through the foundation wall groove, cut its side, and adjust the cutting width to form a space for accommodating the threading pipe.

[0135] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. An adjustable broach grooving system, characterized in that: It comprises a pulling device (1), a cutting device (2), a screw rod (3) and a power source (4); The pulling device (1) is driven by a power source (4), the first end of the screw rod (3) is fixedly connected to the pulling device (1), and the screw rod (3) is driven by the pulling device (1) to rotate around the axis; The second end of the screw rod (3) is cooperatively connected with the threaded hole in the cutting device (2); The cutting width of the cutting device (2) can be adjusted; The pulling and cutting device (2) passes through the foundation wall groove to cut the side of the foundation wall groove.

2. The adjustable broach grooving system according to claim 1, characterized in that: The pulling device (1) comprises a tension support (11), a depth adjuster (12), a support surface (15), an output shaft (16) and an input shaft (17); The output shaft (16) and the input shaft (17) are rotationally connected to the tension bracket (11), the first end of the input shaft (17) is fixedly connected to the power source (4), the second end of the input shaft (17) is transmission-connected to the first end of the output shaft (16), and the second end of the output shaft (16) is fixedly connected to the first end of the screw rod (3); The surface of the tension support (11) facing the cutting device (2) is a support surface (15); A depth adjuster is provided on the top of the tension support (11) to adjust the position of the screw rod (3) in the foundation wall groove.

3. The adjustable broach grooving system according to claim 2, wherein: The tension support (11) is a tensile body with a concave cross-section in the depth direction, with a rectangular base plate in the middle, and a first plate and a second plate are respectively provided on opposite sides of the base plate, the first plate and the second plate are parallel to each other, and the side facing the cutting device (2) is a support surface (15); The base plate is provided with a base through hole, the axial direction of the base through hole being parallel to the length direction of the base wall groove; the surface of the base plate away from the support surface (15) is provided with a boss through hole along the depth direction; The first end of the output shaft (16) is a bevel gear, the second end of the output shaft (16) is a cylinder coaxial with the bevel gear at the first end, the outer peripheral surface of the cylinder is rotatably connected to the base through hole of the base plate, and a threaded hole is provided inwardly on the end surface of the cylindrical surface, and the threaded hole is threadedly connected to the first end of the screw rod (3); The first end of the input shaft (17) is rotatably connected to the boss through hole and exposed to the wall surface, and the second end of the input shaft (17) is a bevel gear that meshes with the bevel gear of the first end of the output shaft (16); Their transmission ratio is not less than 1; The side of the base plate facing the support surface (15) has enough space to accommodate the cutting overrun of the cutting device (2); At least three threaded holes are evenly distributed on the top of the first plate and the second plate, and the axis of the hole is consistent with the depth direction of the tension bracket (11). A screw rod is matched with the hole, and the first end of the screw rod is provided with a hand screw and the other end face is in contact with the wall.

4. The adjustable broach grooving system according to claim 3, wherein: The power source (4) is an electric drill or an electric screwdriver, and its chuck clamps the first end of the input shaft (17); The pulling device (1) is viewed from the direction of the cutting device (2); The output shaft (16) rotates counterclockwise, and the screw rod (3) is a right-hand thread; or, the output shaft (16) rotates clockwise, and the screw rod (3) is a left-hand thread.

5. The adjustable broach grooving system according to claim 1, wherein: The cutting device (2) comprises a cutting support (21), a broach (23), a cover plate (25) and a feeder (26); The broach (23) includes a slide bar (234), a threaded hole is provided at the center of the slide bar (234), and the axis of the threaded hole is parallel to the length direction of the slide bar (234); The cutting bracket (21) is a stretched body with a rectangular cross section along the length direction of the foundation wall groove, and its width is smaller than the width of the foundation wall groove; The top of the cutting bracket (21) is fixedly connected to the control handle (22), and the control handle (22) is located outside the wall; The center of the cutting support (21) has a through hole along its stretching direction, and this hole is a threaded hole, which cooperates with the screw rod (3) for transmission; A slide groove (214) is provided on each of the upper and lower end surfaces of the cutting support (21), and a slide bar (234) of the broach (23) slides in the slide groove (214). The two slide grooves (214) are symmetrical about the axis of the through hole in the center of the cutting support (21) along the stretching direction thereof; When the slide bar (234) of the broach (23) slides in the slide groove (214) toward the pulling device (1), it moves away from the central threaded hole of the cutting bracket (21); A stop groove (215) is provided on the side wall of the sliding groove (214) away from the pulling device (1); The first end of the feeder (26) is a screw rod that is coupled to the threaded hole of the slide bar (234) for transmission. The second end of the feeder (26) is a circular protruding ring that is placed in the retaining groove (215). A special-shaped hole is provided on the outer side of the protruding ring. An indicator (262) is provided on the circumferential surface of the protruding ring, and the indicator (262) is a line evenly distributed on the circumferential surface of the protruding ring; an indicator mark (216) is provided at the position of the cutting bracket (21) closest to the protruding ring; The cover plate (25) covers the opening of the slide groove (214) and is fixedly connected to the cutting bracket (21); The cover plate (25) is provided with a threaded through hole, which faces the side of the slide bar, and the locker (251) is a set screw that cooperates with the threaded through hole.

6. The adjustable broach grooving system according to claim 5, wherein: The broach (23) further comprises a guide surface (231), a cutting edge (232) and a chip removal groove (233); The broach (23) is a stretching body with a roughly rectangular cross-section in the depth direction, wherein the first side surface thereof is fixedly connected to the first end of the slide bar (234), and a threaded hole is provided at the center of the second end surface of the slide bar (234), and the axis of the threaded hole is parallel to the length direction of the slide bar (234); A guide surface (231) is provided on the second side surface close to the pulling device (1), and a cutting edge (232) is provided on the second side surface away from the pulling device (1); The cutting edges (232) are arranged in at least two rows, the cutting edges (232) in the same row are arranged at intervals, and the cutting edges (232) in different rows are arranged in a staggered manner to form chip grooves (233); The slide bar (234) stays at any position of the slide groove (214), and the cutting edge (232) is projected as a continuous straight line along the length direction of the cutting support (21); The cutting edge (232) protrudes from the guide surface (231); The two broaches (23) are symmetrical about the axis of the through hole in the center of the cutting support (21) along the stretching direction thereof.

7. The adjustable broach grooving system according to claim 6, wherein: The control handle (22) is composed of a cylindrical section and a handle, wherein the first end of the cylindrical section is fixedly connected to the top of the cutting bracket (21), and the second end of the cylindrical section is fixedly connected to the handle; The outer diameter of the cylindrical section is smaller than the width of the foundation wall groove, and the length of the cylindrical section is greater than the depth of the foundation wall groove; The handle is oblong and is used for holding.

8. The adjustable broach grooving system according to claim 7, wherein: The cutting support (21) comprises a semi-threaded hole (211) and a semi-bright hole (212); The center of the cutting support (21) has a through hole along its stretching direction, and the hole is composed of two holes merged; One is a threaded hole whose axis coincides with the center of the cutting support (21) along its stretching direction; The second is a circular through hole, the diameter of which is not less than the major diameter of the screw rod (3), the axis of which intersects with the axis of the threaded hole, the plane formed by the two axes is parallel to the bottom surface of the foundation wall groove, the intersection point is projected into the cutting bracket (21) along the depth direction, and the axis of the circular through hole intersects with the axis of the threaded hole to form an acute angle; The axis formed by the intersection along the depth direction is the rotation axis. The circular through hole is swept around the rotation axis toward the threaded hole to remove part of the thread. The sweeping angle is smaller than the angle between the axis of the circular through hole and the axis of the threaded hole.

9. The adjustable broach grooving system according to claim 8, wherein: It includes a baffle (24), one of which is fixedly connected to the side surfaces of the two exits of the semi-bright hole (212) of the cutting support (21); The baffle (24) has two positions, one of which is a blocking position and the other is a releasing position; The cutting bracket (21) is provided with a recessed space in the depth direction on the side of the light hole (212) outlet, a threaded hole is provided on the bottom of the recessed space, the side of the space forms a step with the cutting bracket (21), the side of the baffle (24) is fitted with the step, the baffle (24) is provided with a long hole (241), the fastener (242) passes through the long hole (241) and cooperates with the threaded hole on the bottom of the recessed space to securely connect the baffle (24) and the cutting bracket (21); the side of the upper part of the baffle (24) contacts the major diameter of the thread of the screw rod (3) engaged in the semi-threaded hole (211), and is in a blocking position; The baffle (24) moves upward along the length direction of the long hole (241) and rotates around the axis of the fastener (242), and the upper part of the baffle (24) is disengaged from the screw rod (3) and is in a released position.

10. The method for using the adjustable broach grooving system according to any one of claims 1 to 9, wherein: The following steps are involved: 1) The first foundation groove, the second foundation groove and the foundation wall groove connecting them are constructed on the wall surface; the width of the foundation wall groove is smaller than the diameter of the wire threading pipe; 2) connecting the pulling device (1) and the cutting device (2) to the screw rod (3) respectively; 3) placing the pulling device (1) in the first foundation groove, the cutting device (2) in the second foundation groove, and the screw rod (3) in the foundation wall groove; 3) adjusting the pulling device (1) to a depth within the wall so that the pulling force on the cutting device (2) is parallel to the foundation wall groove; 4) Connect the pulling device (1) to the power source (4), pull the cutting device (2) through the foundation wall groove, cut its side, and adjust the cutting width to form a space for accommodating the threading pipe.

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