A kind of secondary structure wall water and electricity pre-burying with slotting positioning device

Abstract

The utility model relates to building construction device technical field especially, relates to a kind of slotting positioning device for water and electricity pre-burying of secondary structure wall, including locating plate, guide rail, displacement plate, L-shaped plate and locating chain, locating plate overall section is circular, and is inserted in hand-held cutting machine operation joint within, guide rail is fixed in the side wall of locating plate by bolt, and guide rail installation position is above the center line of locating plate, the outside of guide rail is opened in the symmetrical limit slot, displacement plate is slidably inserted in guide rail, the outside wall of displacement plate is symmetrically equipped with threaded ejector rod, threaded ejector rod outside and at guide rail end surface position cooperation installation has locking nut, L-shaped plate is fixedly connected with the outside wall of displacement plate by cross bar, the outer wall of L-shaped plate is equipped with storage roller by rotating part, the bottom position of L-shaped plate is equipped with sealing ring by support, the inner wall of sealing ring and storage roller outer ring contact but not connect;The utility model effectively guarantees the levelness of overall slotting, without later secondary slotting correction.

Description

Technical Field

[0001] This utility model relates to the field of building construction equipment technology, and in particular to a slotting and positioning device for pre-embedding water and electricity in secondary structure walls. Background Technology

[0002] The slotting and positioning device for pre-embedded water and electricity systems in secondary structural walls is a key auxiliary device in the construction field for the pre-embedding of water and electricity pipelines in secondary structural walls (such as aerated concrete block walls, hollow brick walls, lightweight partition boards, and other non-load-bearing walls). Its core function is to accurately determine the position, direction, width, and depth of the pre-embedded water and electricity slots on the wall surface, providing a positioning benchmark for subsequent slotting equipment. This ensures that the pre-embedded slots meet design specifications (such as controlling the horizontal and vertical errors of the slots within allowable ranges), while avoiding damage to the wall structure due to positioning deviations (such as excessive slotting leading to wall cracking and hollowing). Ultimately, it guarantees the integrity and safety of the wall after the water and electricity pipelines are pre-embedded, making it an important tool for achieving standardized and precise construction of pre-embedded water and electricity systems in secondary structural walls. In the current construction of pre-embedded water and electricity channels in secondary structure walls, handheld cutting machines have become the most widely used channeling equipment due to their advantages such as high portability, flexible operation, and adaptability to small-scale and irregular channel channeling. However, existing channeling positioning devices adapted to handheld cutting machines use traditional positioning devices such as chalk lines, tape measures, or straightedges. It is necessary to manually determine the channel direction by first marking lines on the wall surface, and then the worker cuts along the marked lines with a handheld cutting machine. During this process, manual operation is easily affected by factors such as fatigue, line deviation, and uneven wall material (such as holes in aerated concrete blocks, local hard spots), which can cause the cutting machine to deviate from the marked line trajectory, resulting in tilted pre-embedded channels (such as horizontal channels tilting upwards or downwards, and vertical channels shifting left or right). Secondary channeling correction is required later, which not only increases construction costs but also easily aggravates wall damage.

[0003] Therefore, it is necessary to provide a slotting and positioning device for pre-embedded water and electricity in secondary structural walls to solve the above-mentioned technical problems. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a slotting and positioning device for pre-embedded water and electricity in secondary structure walls.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a slotting and positioning device for pre-embedded water and electricity in secondary structure wall, including a positioning plate, a guide rail, a displacement plate, an L-shaped plate and a positioning chain. The overall cross-section of the positioning plate is circular and it is inserted into the cutting groove of the handheld cutting machine. The guide rail is fixed to the side wall of the positioning plate by bolts, and the installation position of the guide rail is above the center line of the positioning plate. Limiting grooves are symmetrically opened on the outer side of the guide rail. The displacement plate is slidably inserted into the guide rail. Threaded push rods are symmetrically installed on the outer side wall of the displacement plate. Locking nuts are installed on the outer side of the threaded push rods and at the end face of the guide rail. The L-shaped plate is fixedly connected to the outer wall of the displacement plate by a crossbar. A receiving roller is installed on the outer wall of the L-shaped plate through a rotating part. A sealing ring is installed at the bottom of the L-shaped plate through a bracket. The inner wall of the sealing ring contacts but does not connect with the outer ring of the receiving roller. A through hole is opened at the center of one end of the sealing ring. One end of the positioning chain is wound inside the receiving roller, and a traction rod is fixedly installed at the end of the positioning chain that protrudes from the through hole. A positioning sleeve is fixedly installed on the outer wall of the traction rod.

[0006] Preferably, the two outer side walls of the positioning plate are provided with rubber protrusions, and the multiple rubber protrusions are distributed in an equally spaced fan shape.

[0007] Preferably, the rotating part includes arc-shaped plate frames symmetrically installed on the side wall of the L-shaped plate, a bushing is rotatably installed between the two arc-shaped plate frames, and a rotating shaft is rotatably inserted into the center of the bushing, with the rotating shaft vertically inserted into the center of the receiving roller. A first threaded rod is installed inside the arc-shaped plate frame at one location via a threaded connection. A support plate is welded to the inner wall of the sealing ring on the side facing away from the rotating part, and a second threaded rod is installed inside the support plate via a threaded connection.

[0008] Preferably, a placement groove is provided at the center of the opposite end face of the first threaded rod and the second threaded rod, and a ball is embedded in the placement groove.

[0009] Preferably, multiple sets of positioning chains are wound along the internal axis of the receiving roller, and reinforcing rods are installed at equal intervals between the connected positioning chains, and the connection points between the reinforcing rods and the adjacent two positioning chains can rotate relative to each other.

[0010] Preferably, the positioning plate has a through slot at its center, and symmetrical circular holes at its center. Circular rods are symmetrically inserted into the circular holes, and baffles are fixedly installed on both ends of the circular rods. A tension spring is provided on the outer ring of the circular rods between the baffles and the outer wall of the positioning plate.

[0011] Preferably, triangular blocks are symmetrically installed on the inner wall of the through slot area inside the positioning plate, and a C-shaped plate is fixedly installed on the upper side wall of the positioning plate. A T-shaped threaded adjusting rod is installed on the top of the C-shaped plate through a threaded connection. Positioning rods are symmetrically installed on the lower end face of the top of the C-shaped plate. An inner insert plate is sleeved on the outer side of the two positioning rods. The top of the inner insert plate is rotatably connected to the bottom of the T-shaped threaded adjusting rod through a rotating sleeve. The bottom of the inner insert plate is inserted directly into the through slot, and extrusion blocks are symmetrically installed on both sides of the inner insert plate. The extrusion blocks contact the inclined surfaces of the triangular blocks but are not connected.

[0012] Compared with related technologies, the groove-cutting and positioning device for pre-embedded water and electricity in secondary structure walls provided by this utility model has the following beneficial effects: This utility model provides a grooving positioning device for pre-embedded water and electricity in secondary structure walls. When the utility model is working, the positioning sleeve is fixed on a handheld cutting machine. When the construction worker holds the handheld cutting machine, the positioning chain is driven to gradually separate in the receiving roller. Since the positioning chain is made up of multiple chain links hinged together, its physical structure determines that its movement has a unidirectional degree of freedom. It can be understood that it can only be stretched or contracted along the length direction of the positioning chain itself, and cannot be offset or bent in the direction perpendicular to the pre-embedded joint. Therefore, this method effectively ensures the overall levelness of the grooving, eliminates the need for secondary grooving correction, reduces construction costs, and prevents secondary damage to the wall.

[0013] This utility model provides a grooving positioning device for pre-embedded water and electricity in secondary structure walls. When the handheld cutting machine is used, multiple sets of positioning chains separate, and adjacent sets of positioning chains are mutually constrained by reinforcing rods. The constraining direction is perpendicular to the path direction of the pre-embedded joint, thereby further ensuring that the positioning chains do not move along the vertical direction of the pre-embedded joint when they separate, and the overall levelness of the grooving is further improved. At the same time, the connection strength between the positioning plate and the pre-embedded joint can be increased by the tension spring force and horizontal extrusion force, and it is suitable for the positioning requirements of pre-embedded joints of different sizes. Attached Figure Description

[0014] Figure 1 This is a perspective view of the overall structure of this utility model; Figure 2 This utility model Figure 1 A magnified view of a portion of region A in the middle; Figure 3 This is a partial structural cross-sectional view of the present invention; Figure 4 This is a side view of the overall structure of this utility model; Figure 5 This is a schematic diagram of the overall structure construction of this utility model; Figure 6 This utility model Figure 1 A magnified view of a portion of region B in the middle; Figure 7 This is a top view of the positioning chain of this utility model; The following are the labels in the diagram: 1. Positioning plate, 2. Guide rail, 3. Displacement plate, 4. L-shaped plate, 5. Rotating part, 6. Receiving roller, 7. Sealing ring, 8. Positioning chain, 10. Rubber protrusion, 11. Through slot, 111. Round hole, 12. Round rod, 121. Baffle, 13. Tension spring, 14. Triangular block, 15. C-shaped plate, 16. T-shaped threaded adjusting rod, 17. Positioning rod, 18. Inner insert plate, 181. Extrusion block, 21. Limiting groove, 31. Threaded top rod, 51. Arc-shaped plate frame, 52. Bushing, 53. Rotating shaft, 54. First threaded rod, 71. Through hole, 72. Support plate, 73. Second threaded rod, 81. Traction rod, 82. Reinforcing rod. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the user's or operator's intent or convention. Therefore, these terms are defined based on the entire contents of this specification.

[0017] Please see Figures 1-7 The present invention provides a grooving positioning device for pre-embedded water and electricity in secondary structure walls, comprising a positioning plate 1, a guide rail 2, a displacement plate 3, an L-shaped plate 4, and a positioning chain 8. The positioning plate 1 has a circular cross-section and is inserted into the cutting groove of a handheld cutting machine. The handheld cutter cuts the pre-embedded seam (the pre-embedded seam refers to a single parallel seam). After the cutting length reaches two cutting disc diameters, the positioning plate 1 can be inserted into the pre-embedded seam. The width of the positioning plate 1 is the same as the width of the cutting disc of the handheld cutter. In this embodiment, multiple models of positioning plates 1 can be equipped. The dimensions of the multiple positioning plates 1 are the same as those of the handheld cutting machines on the market, specifically, the width of the two is the same. The guide rail 2 is fixed to the side wall of the positioning plate 1 by bolts, and the guide rail 2 is detachable from the positioning plate 1; The guide rail 2 is installed above the center line of the positioning plate 1. Therefore, when the positioning plate 1 is inserted into the pre-embedded joint for positioning, the design position of the guide rail 2 will not interfere with the insertion depth of the positioning plate 1. A limiting groove 21 is symmetrically provided on the outer side of the guide rail 2. In this example, the limiting groove 21 is shown in the shape of a rectangular groove. When inserting positioning plate 1 into the embedded joint, the center line passing through the center of positioning plate 1 should be parallel to the embedded joint. The specific position can be referenced... Figure 5 As shown, the displacement plate 3 is slidably inserted into the guide rail 2, and the displacement plate 3 can move within the guide rail 2, with the direction of movement perpendicular to the pre-embedded joint. Threaded push rods 31 are symmetrically installed on the outer side wall of the displacement plate 3. Locking nuts 32 are installed on the outer side of the threaded push rods 31 and at the end face of the guide rail 2. When adjusting the relative position of the displacement plate 3, the locking nuts 32 must be loosened first. The displacement plate 3 is moved while the threaded push rods 31 slide in the limiting groove 21. After the displacement reaches the specified position, the locking nuts 32 are tightened so that they are tightly attached to the outer side wall of the guide rail 2 to complete the positioning adjustment of the displacement plate 3. L-shaped plate 4 is fixedly connected to the outer wall of displacement plate 3 by a crossbar. Therefore, L-shaped plate 4 and displacement plate 3 can be understood as an integral part. The position of L-shaped plate 4 relative to guide rail 2 can be adjusted by adjusting the position of displacement plate 3. The outer wall of the L-shaped plate 4 is equipped with a receiving roller 6 via a rotating part 5, and a torsion spring is installed at the connection between the receiving roller 6 and the rotating part 5. A sealing ring 7 is installed at the bottom of the L-shaped plate 4 via a bracket. The inner wall of the sealing ring 7 contacts but does not connect with the outer ring of the receiving roller 6. The sealing ring 7 seals the outside of the receiving roller 6 while providing external protection. A through hole 71 is provided at the center of one end of the sealing ring 7. An extension square tube can be fixedly installed on the outside of the sealing ring 7. The extension square tube can be referred to as... Figure 1 As shown, the extended square tube is connected to the through hole 71; One end of the positioning chain 8 is wound inside the receiving roller 6. The width of the positioning chain 8 matches the through hole 71. A traction rod 81 is fixedly installed on the end of the positioning chain 8 that protrudes from the through hole 71. Under normal conditions, the traction rod 81 is close to the outer side of the sealing ring 7 in the area of ​​the through hole 71 to prevent the positioning chain 8 from falling completely into the receiving roller 6. A positioning sleeve 9 is fixedly installed on the outer wall of the traction rod 81. The positioning sleeve 9 is used for fixed connection with the handheld cutter, and is generally connected to the handle of the handheld cutter. The positioning sleeve 9 can be a clamp or an elastic silicone sleeve. During operation, the positioning sleeve 9 is fixed to the handheld cutting machine. When the construction worker holds the handheld cutting machine, the positioning chain 8 is driven to gradually separate within the receiving roller 6. Since the positioning chain 8 is made of multiple chain links, its physical structure determines that its movement has a unidirectional degree of freedom. It can be understood that it can only stretch or contract along the length direction of the positioning chain 8 itself (i.e., the horizontal direction of the pre-embedded joint), and cannot be offset or bent in the direction perpendicular to the pre-embedded joint (such as upward or downward). Therefore, this method effectively ensures the overall levelness of the groove, eliminating the need for secondary groove correction in the later stage, reducing construction costs, and preventing secondary damage to the wall.

[0018] Reference Figure 1 Rubber protrusions 10 are provided on the two outer side walls of the positioning plate 1, and multiple rubber protrusions 10 are distributed in a fan shape with equal spacing. When the positioning plate 1 is inserted into the pre-embedded joint, several rubber protrusions 10 directly contact the pre-embedded joint, increasing the fixing strength of the positioning plate 1.

[0019] In another embodiment, see Figures 1-7 The rotating part 5 includes an arc-shaped plate frame 51 symmetrically installed on the side wall of the L-shaped plate 4, a bushing 52 rotatably installed between the two arc-shaped plate frames 51, and a rotating shaft 53 rotatably inserted into the center of the bushing 52. The rotating shaft 53 is vertically inserted into the center of the storage roller 6. While the rotating shaft 53 drives the storage roller 6 to rotate, the rotating shaft 53 can undergo axial displacement relative to the storage roller 6. One of the arc-shaped plate frames 51 has a first threaded rod 54 installed inside by threaded engagement. A support plate 72 is welded to the inner wall of the sealing ring 7 on the side opposite to the rotating part 5. A second threaded rod 73 is installed inside the support plate 72 by threaded engagement. Under normal conditions, the first threaded rod 54 and the second threaded rod 73 are tightly attached to the two side walls of the receiving roller 6 to lock the axial position of the receiving roller 6 relative to the rotation axis 53. In practice, either the first threaded rod 54 or the second threaded rod 73 can be loosened first. Loosening means rotating the first threaded rod 54 or the second threaded rod 73 to move it away from the outer wall of the receiving roller 6. Taking the loosening of the first threaded rod 54 as an example, the receiving roller 6 is then controlled to move laterally on the rotating shaft 53 until one side of its outer wall is once again attached to the end face of the first threaded rod 54. Then the second threaded rod 73 is rotated so that its end face is once again attached to the other side of the receiving roller 6. At this time, the overall adjustment of the receiving roller 6 in the vertical reverse direction along the pre-embedded seam can be completed, thereby improving the applicability of the overall device. Furthermore, a placement groove is provided at the center of the opposite end face of the first threaded rod 54 and the second threaded rod 73, and a ball is embedded in the placement groove. At this time, the ball will be in direct contact with the two side walls of the receiving roller 6. When the receiving roller 6 rotates, it will drive the ball to rotate relative to it, thereby reducing the wear on the two side walls of the receiving roller 6.

[0020] In another embodiment, see Figures 1-7 Multiple sets of positioning chains 8 are wound along the internal axis of the receiving roller 6. Reinforcing rods 82 are installed at equal intervals between the connected positioning chains 8, and the connection points between the reinforcing rods 82 and the two adjacent positioning chains 8 can rotate relative to each other. Meanwhile, a partition is provided inside the through hole 71, which can divide the through hole 71 into channels of equal width. The number of channels should be the same as the number of sets of positioning chains 8, and the width of the channels should also match that of the positioning chains 8. When the handheld cutting machine is in operation, multiple sets of positioning chains 8 separate. The two adjacent sets of positioning chains 8 are mutually constrained by reinforcing rods 82. The constraining direction is perpendicular to the path direction of the pre-embedded seam, which further ensures that the positioning chains 8 will not move in the vertical direction of the pre-embedded seam when they separate, and the overall levelness of the groove is further improved.

[0021] In another embodiment, see Figures 1-6 The positioning plate 1 has a through slot 11 in the center of its interior, which can be understood as splitting the positioning plate 1 in half through the through slot 11. For ease of explanation, the positioning plate 1 to the left of the through slot 11 is named positioning plate 1 (A), and the positioning plate 1 to the right of the through slot 11 is named positioning plate 1 (B). The positioning plate 1 has symmetrically symmetrically oriented circular holes 111 at its center. Circular rods 12 are symmetrically inserted into the circular holes 111. Baffles 121 are fixedly installed on both ends of the circular rods 12. A tension spring 13 is provided around the outer ring of the circular rods 12 and between the baffles 121 and the outer wall of the positioning plate 1. Under normal conditions, the elastic force of the tension spring 13 causes both the positioning plate 1(A) and the positioning plate 1(B) to move toward the baffle 121, at which point the width of the through slot 11 is at its maximum. During operation, the construction worker presses the outer walls of the positioning plate 1(A) and the positioning plate 1(B) with their hands, making the distance between the two outer sides of the positioning plate 1(A) and the positioning plate 1(B) less than the width of the pre-embedded joint. Then, the positioning plate 1 is inserted into the pre-embedded joint and the pressing hand is released. Subsequently, the elastic force of the tension spring 13 causes the positioning plate 1(A) and the positioning plate 1(B) to press tightly against the inner wall of the pre-embedded joint. At this time, the connection tightness between the positioning plate and the pre-embedded joint is improved, making it less prone to loosening during operation. This provides a stable guarantee for cutting and grooving operations and is suitable for positioning requirements of pre-embedded joints of different sizes. Furthermore, triangular blocks 14 are symmetrically installed on the inner wall of the through slot 11 inside the positioning plate 1. A C-shaped plate 15 is fixedly installed on the upper side wall of the positioning plate 1. A T-shaped threaded adjusting rod 16 is installed on the top of the C-shaped plate 15 through a threaded fit. A positioning rod 17 is symmetrically installed on the lower end face of the top of the C-shaped plate 15. An inner insert plate 18 is sleeved on the outer side of the two positioning rods 17. The top of the inner insert plate 18 is rotatably connected to the bottom of the T-shaped threaded adjusting rod 16 via the rotating sleeve 19. The bottom of the inner insert plate 18 is inserted directly into the through slot 11. The two side walls of the inner insert plate 18 are symmetrically equipped with extrusion blocks 181. The extrusion blocks 181 are in contact with but not connected to the inclined surfaces of the triangular blocks 14. In actual operation, after the positioning plate 1 is inserted into the pre-embedded joint, the construction personnel rotate the T-shaped threaded adjusting rod 16. The T-shaped threaded adjusting rod 16 can drive the inner insert plate 18 to slide vertically down along the positioning rod 17. During the downward movement of the inner insert plate 18, the extrusion blocks 181 are moved simultaneously, so that the extrusion blocks 181 slide along the inclined surfaces of the triangular blocks 14. The two opposing triangular blocks 14 are both subjected to the extrusion force of the extrusion blocks 181. This extrusion force pushes the positioning plate 1 to fit more tightly in the pre-embedded joint, thereby further improving the connection strength between the positioning plate 1 and the pre-embedded joint and further improving the working stability.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A slotting and positioning device for pre-embedded water and electricity systems in secondary structural walls, characterized in that, include: Positioning plate (1), the overall cross section of positioning plate (1) is circular, and it is inserted into the working slit of the handheld cutting machine; The guide rail (2) is fixed to the side wall of the positioning plate (1) by bolts, and the installation position of the guide rail (2) is above the center line of the positioning plate (1). The guide rail (2) has symmetrical limit grooves (21) on the outer side. Displacement plate (3) is slidably inserted into guide rail (2). Threaded push rods (31) are symmetrically installed on the outer side wall of displacement plate (3). Locking nuts (32) are installed on the outer side of threaded push rods (31) and at the end face of guide rail (2). L-shaped plate (4), L-shaped plate (4) is fixedly connected to the outer wall of displacement plate (3) by crossbar, and a receiving roller (6) is installed on the outer wall of L-shaped plate (4) by rotating part (5). A sealing ring (7) is installed at the bottom of L-shaped plate (4) by bracket. The inner wall of sealing ring (7) contacts the outer ring of receiving roller (6) but is not connected. A through hole (71) is opened at the center of one end of sealing ring (7). The positioning chain (8) has one end wound inside the receiving roller (6), and the end of the positioning chain (8) exposed outside the through hole (71) is fixedly installed with a traction rod (81). The outer wall of the traction rod (81) is fixedly installed with a positioning sleeve (9).

2. The slotting and positioning device for pre-embedded water and electricity systems in secondary structural walls according to claim 1, characterized in that, The two outer side walls of the positioning plate (1) are provided with rubber protrusions (10), and the multiple rubber protrusions (10) are distributed in a fan shape with equal spacing.

3. The slotting and positioning device for pre-embedded water and electricity systems in secondary structural walls according to claim 1, characterized in that, The rotating part (5) includes an arc-shaped plate frame (51) symmetrically installed on the side wall of the L-shaped plate (4), a bushing (52) is rotatably installed between the two arc-shaped plate frames (51), and a rotating shaft (53) is rotatably inserted into the center of the bushing (52). The rotating shaft (53) is vertically inserted into the center of the receiving roller (6). One of the arc-shaped plate frames (51) has a first threaded rod (54) installed inside by threaded engagement. A support plate (72) is welded to the inner wall of the sealing ring (7) on the side facing away from the rotating part (5). A second threaded rod (73) is installed inside the support plate (72) by threaded engagement.

4. The slotting and positioning device for pre-embedded water and electricity systems in secondary structural walls according to claim 3, characterized in that, The first threaded rod (54) and the second threaded rod (73) each have a placement groove at the center of their opposite end faces, and a ball is embedded in the placement groove.

5. A slotting and positioning device for pre-embedded water and electricity systems in secondary structural walls according to claim 1, characterized in that, Multiple sets of positioning chains (8) are wound along the internal axis of the receiving roller (6). Reinforcing rods (82) are installed at equal intervals between the connected positioning chains (8), and the connection points of the reinforcing rods (82) and the adjacent two positioning chains (8) can rotate relative to each other.

6. The slotting and positioning device for pre-embedded water and electricity systems in secondary structural walls according to claim 1, characterized in that, The positioning plate (1) has a through slot (11) at the center of its interior. A circular hole (111) is symmetrically opened at the center of its interior. A circular rod (12) is symmetrically inserted into the circular hole (111). A baffle (121) is fixedly installed on both ends of the circular rod (12). A tension spring (13) is provided on the outer ring of the circular rod (12) between the baffle (121) and the outer wall of the positioning plate (1).

7. A slotting and positioning device for pre-embedded water and electricity systems in a secondary structural wall according to claim 6, characterized in that, The positioning plate (1) has triangular blocks (14) symmetrically installed on the inner wall of the through slot (11). A C-shaped plate (15) is fixedly installed on the upper side wall of the positioning plate (1). A T-shaped threaded adjusting rod (16) is installed on the top of the C-shaped plate (15) through a threaded fit. A positioning rod (17) is symmetrically installed on the lower end face of the top of the C-shaped plate (15). An inner insert plate (18) is sleeved on the outer side of the two positioning rods (17). The top of the inner insert plate (18) is rotatably connected to the bottom of the T-shaped threaded adjusting rod (16) through a rotating sleeve (19). The bottom of the inner insert plate (18) is inserted directly into the through slot (11). Extrusion blocks (181) are symmetrically installed on both sides of the inner insert plate (18). The extrusion blocks (181) are in contact with but not connected to the inclined surface of the triangular blocks (14).

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