A water stop screw cutting tool

Abstract

The present invention belongs to the technical field of reinforced concrete formwork engineering, and particularly relates to a water-stop screw cutting tool, including a truncated cone-shaped cutting tool composed of four arc-shaped blades, the inner wall of the front end of the arc-shaped blade is provided with alloy teeth, the convex ribs of the arc-shaped blade are stuck in the groove of the fixing ring, the rear end of the fixing ring is fixed with an annular plugging plate, the annular plugging plate is fixed to the hollow guide rod backward, the middle of the hollow guide rod is fixed with a passive gear, large rolling bearings are provided in front and behind the passive gear, the lower end of the large rolling bearing is fixed with a bracket, a small rolling bearing is installed between the front and rear brackets, an inner spline tube is provided between the small rolling bearings, a driving gear is fixed on the inner spline tube, the driving gear is meshed with the passive gear, and the rear end of the inner spline tube is fixedly connected to the rotating shaft of the rotating device. The tool of the present invention can penetrate into the screw eye and cut the water-stop screw in the screw eye, thus overcoming the difficulty of cutting the water-stop screw in the screw eye.

Description

Technical Field

[0001] The invention belongs to the technical field of reinforced concrete formwork engineering, and in particular relates to a water-stop screw cutting tool. Background Art

[0002] In the construction industry, the pull-together water-stop screws are widely used in reinforced concrete formwork projects. After the concrete pouring is completed, the ends of the water-stop screws on both sides of the structure need to be cut off. Especially for concrete structures with waterproof and anti-corrosion requirements, it is required that after the concrete is formed, the water-stop screw heads must be recessed into the concrete, and then the screw eyes are sealed and compacted with waterproof mortar. At present, the method of cutting and chiseling the water-stop screws in the screw eyes is generally for the operators to cut and grind with a handheld cutting machine. During construction, it is difficult to make a deep cut on the end of the water-stop screw recessed in the screw eye. Usually, it can only be cut on the surface of the concrete. In this way, when the screw eyes are sealed in the later stage, the protective layer of the end water-stop screws will be very thin, and it is easy to rust and other phenomena in the later stage, affecting the quality and appearance of the structure. In addition, in the process of chiseling the water-stop screws in the screw eyes, it is easy to scratch the surrounding wall concrete, resulting in improper protection of the finished product, and ultimately causing the shape of the screw eyes to be irregular, and standardized sealing cannot be achieved in the later stage. Summary of the invention

[0003] The problem to be solved by the present invention is to overcome the shortcomings of the background technology and provide a water-stop screw cutting tool.

[0004] The present invention is achieved through the following technical solutions:

[0005] A water-stop screw cutting tool comprises a truncated cone cutting head, wherein the truncated cone cutting head comprises four separated arc-shaped blades, the four arc-shaped blades surround a through hole, the front end inner wall of the arc-shaped blade is provided with alloy teeth, the rear end edge of the arc-shaped blade is provided with convex ribs, the convex ribs of the four arc-shaped blades are respectively inserted into four grooves disconnected on the inner wall of a fixing ring, the grooves are evenly distributed along the inner wall of the fixing ring, the opening of the grooves is small and the inner cavity is large, the arc length of the grooves is equal to the arc length of the convex ribs, the width of the inner cavity of the grooves is greater than the width of the convex ribs, the depth of the inner cavity of the grooves is greater than the thickness of the convex ribs, and when the truncated cone cutting head extends to the bottom of the screw eye, the alloy teeth can bite the water-stop screw; the rear fixing portion of the fixing ring An annular sealing plate, wherein the diameter of the middle hole on the annular sealing plate is larger than the diameter of the water-stop screw; a hollow guide rod is fixed to the rear of the annular sealing plate, wherein the diameter of the middle hole of the hollow guide rod is larger than the diameter of the water-stop screw, a passive gear is fixed in the middle of the hollow guide rod, large rolling bearings are arranged on the hollow guide rods on the front and rear sides of the passive gear, the lower end of the large rolling bearing is fixed to the upper end of the bracket, the bracket is provided with a mounting hole, a small rolling bearing is installed in the mounting hole, an inner spline tube is arranged between the front and rear small rolling bearings, a driving gear is fixed on the inner spline tube, the driving gear is meshed with the passive gear, the inner spline tube extends out from the small rolling bearing at the rear, and the rear end of the inner spline tube is fixedly connected to the rotating shaft of the rotating device.

[0006] The present invention also includes an outer shell, wherein a large hole is provided on the front end surface of the upper part of the outer shell, the diameter of the large hole is larger than the diameter of the hollow guide rod, and the front end of the hollow guide rod passes through the outer shell through the large hole; a small hole is provided on the rear end surface of the upper part of the outer shell at a position corresponding to the large hole, and the diameter of the small hole is larger than the diameter of the water-stop screw; a lower hole is provided on the rear end surface of the lower part of the outer shell, and an inner spline tube passes through the lower hole; the bracket is located in the outer shell, and the left and right ends of the bracket are respectively fixed on the left and right inner walls of the outer shell, and the lower end of the bracket is fixed on the inner bottom wall of the outer shell.

[0007] Furthermore, handles are provided on the left and right sides of the shell.

[0008] Furthermore, the shell is a rectangular parallelepiped shell.

[0009] Furthermore, the rotating device is an angle grinder, a handheld electric wrench, or a micro rotating motor.

[0010] Beneficial effects of the present invention:

[0011] 1. It can penetrate into the screw eye and cut the water-stop screw in the screw eye, overcoming the difficulty of cutting the water-stop screw in the screw eye;

[0012] 2. The water-stop screw can be deeply cut, which solves the problem of thin protective layer of the end water-stop screw, and there will be no rust and other problems that affect the appearance of the structure in the later stage;

[0013] 3. When cutting the water-stop screw, the frustum-shaped cutting head rotates at high speed in the screw eye, rubbing the screw eye. The friction shape is regular, which is convenient for later plugging;

[0014] 4. The use of the tool of the present invention improves construction efficiency and shortens construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of this embodiment without a housing;

[0016] Figure 2 This is a schematic diagram of the overall structure of this embodiment without a housing from another angle;

[0017] Figure 3 This is a schematic diagram of the upper structure of this embodiment;

[0018] Figure 4 This is a structural schematic diagram of the hollow guide rod of this embodiment;

[0019] Figure 5 This is a schematic diagram of the structure of the truncated cone cutting head of this embodiment;

[0020] Figure 6 This is a schematic diagram of the structure of the truncated cone cutting head of this embodiment without the annular sealing plate;

[0021] Figure 7 This is a schematic diagram of the front structure of the truncated cone type cutting head of this embodiment;

[0022] Figure 8 This is a schematic diagram of the explosion structure at the truncated cone cutting head of this embodiment;

[0023] Fig. 9 This is a schematic diagram of the cutaway structure of the truncated cone type cutting head of this embodiment;

[0024] Fig.10 This is a schematic diagram of the cutaway structure of the fixing ring of this embodiment;

[0025] Fig.11 This is a schematic diagram of the cutaway structure of the arc-shaped blade of this embodiment;

[0026] Fig.12 This is a schematic diagram of the structure of the lower part of this embodiment;

[0027] Fig.13 This is a schematic diagram of the front structure of the housing of this embodiment;

[0028] Fig.14 This is a schematic diagram of the structure of the rear side of the housing of this embodiment;

[0029] Fig.15 This is a schematic diagram of the overall front structure of this embodiment after the housing is installed;

[0030] Fig.16 This is a schematic diagram of the overall structure of the rear side after the housing is installed in this embodiment;

[0031] Fig.17 This is a schematic diagram of the structure of the embodiment when it just starts working;

[0032] Fig.18 This is a schematic diagram of the working state structure of this embodiment after inserting into the screw eye;

[0033] Fig.19 This is a schematic diagram of the cutaway structure of this embodiment;

[0034] Fig. 20 This is a schematic diagram of the support structure of this embodiment;

[0035] Fig.21 This is a schematic diagram of the support structure after the inner spline tube is installed in this embodiment.

[0036] In the figure, 1 is a frustoconical cutting head, 2 is an arc-shaped blade, 3 is an alloy tooth, 4 is a convex rib, 5 is a fixing ring, 6 is a groove, 7 is a through hole, 8 is a water-stop screw, 9 is a screw eye, 10 is an annular sealing plate, 11 is a hollow guide rod, 12 is a passive gear, 13 is a large rolling bearing, 14 is a bracket, 15 is a mounting hole, 16 is a small rolling bearing, 17 is an inner spline tube, 18 is a driving gear, 19 is a housing, 20 is a large hole, 21 is a small hole, 22 is a lower hole, and 23 is a handle. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0038] The water-stop screw cutting tool of this embodiment includes a frustoconical cutting head 1, which is in the shape of a frustoconical cone as a whole, with a small diameter at the front end and a large diameter at the rear end. In the middle of the frustoconical cutting head 1 is a through hole 7 for the water-stop screw 8 to pass through. The frustoconical cutting head 1 includes four separate arcuate blades 2, and the four arcuate blades 2 surround the through hole 7. The front inner wall of the arcuate blade 2 is provided with alloy teeth 3, and the cutting of the water-stop screw 8 is achieved by the engagement and rotation of the alloy teeth 3 with the water-stop screw 8. A convex rib 4 is provided on the rear end edge of the arcuate blade 2, and the convex ribs 4 of the four arcuate blades 2 are respectively inserted into four grooves 6 broken on the inner wall of the fixing ring 5, and the grooves 6 are evenly arranged around the inner wall of the fixing ring 5. The four grooves 6 are discontinuous, and the opening of the groove 6 is small and the inner cavity is large. The arc length of the groove 6 is equal to the arc length of the rib 4. The dimensions of the groove 6 and the rib 4 are equal except for the arc length direction. The dimensions of the groove 6 in other directions are larger than the rib 4, that is, the width of the inner cavity of the groove 6 is larger than the width of the rib 4, and the depth of the inner cavity of the groove 6 is larger than the thickness of the rib 4. The rib 4 has a certain activity space in the groove 6, and the rib 4 can rotate slightly in the groove 6. Except that it cannot move along the circumferential direction of the fixing ring 5, the rib 4 can be displaced in the width direction and depth direction of the groove 6. Therefore, the rib 4 cannot rotate along the circumferential direction of the groove 6 because the rib 4 is not movable in the circumferential direction of the fixing ring 5. It is stuck by the groove 6 in the circumferential direction, but since the convex rib 4 can move in the width and depth directions of the groove 6, the shape of the through hole 7 surrounded by the four arc-shaped blades 2 will change. When the front ends of the four arc-shaped blades 2 are subjected to an extrusion force toward the center of the circle, the front ends of the four arc-shaped blades 2 will move together, and the front end diameter will become smaller. At the same time, the rear ends of the four arc-shaped blades 2 will move in the groove 6, and the rear end diameter will become larger. The through hole 7 will change from a cylindrical through hole 7 to a frustum-shaped through hole 7, and the inner diameter of the front end of the through hole 7 will become smaller, and the inner diameter of the rear end will become larger. By using this principle, the alloy teeth 3 at the front end of the frustum-shaped cutting head 1 can engage with the water-stop screw 8.The extrusion force on the four arc-shaped blades 2 in the present invention comes from the screw eye 9. The most common shape of the screw eye 9 is a trumpet hole, that is, a trumpet mouth formed after removing the plastic cone on the water-stop screw 8. When the truncated cone cutting head 1 extends into the screw eye 9, the inner diameter of the screw eye 9 becomes smaller and smaller. When the inner diameter of the screw eye 9 is smaller than the outer diameter of the front end of the truncated cone cutting head 1, the extrusion force on the arc-shaped blades 2 begins to be generated. The front ends of the four arc-shaped blades 2 begin to move closer, and the rear ends slowly open. The alloy teeth 3 gradually bite the water-stop screw 8. When the truncated cone cutting head 1 extends to the bottom of the screw eye 9, the alloy teeth 3 gradually bite the water-stop screw 8. When the water stop screw 8 is cut, the alloy teeth 3 can bite the water stop screw 8, and the water stop screw 8 can be cut. During the cutting process, the truncated cone cutting head 1 continues to be pushed inward to increase the cutting depth of the water stop screw 8. Generally, as long as the cutting depth of the surface of the water stop screw 8 reaches 5-8mm, the shear strength of the water stop screw 8 at the biting cutting part will show a weak point, and the yield strength will be greatly reduced. At this time, the worker only needs to hold the outer end of the water stop screw 8 and bend it once or twice to break the water stop screw 8 in the screw eye 9, thereby realizing the removal of the water stop screw 8. The most ideal situation is that when the depth of the alloy teeth 3 biting the water stop screw 8 reaches 5-8mm, the outer diameter of the front end of the truncated cone cutting head 1 is just equal to the smallest inner diameter of the screw eye 9, that is, the front end of the truncated cone cutting head 1 is just located at the bottom of the screw eye 9, reaching the maximum cutting length, and the water stop screw 8 in the screw eye 9 can be completely cut off.

[0039] An annular plugging plate 10 is fixed at the rear end of the above-mentioned fixing ring 5. The diameter of the middle hole on the annular plugging plate 10 is slightly larger than the diameter of the water-stop screw 8 to ensure that the water-stop screw 8 can pass through, and generally 2-3mm larger. A hollow guide rod 11 is fixed to the rear of the annular plugging plate 10. The diameter of the middle hole of the hollow guide rod 11 is also larger than the diameter of the water-stop screw 8. The diameter of the middle hole of the hollow guide rod 11 is equal to the diameter of the middle hole on the annular plugging plate 10. A passive gear 12 is fixed to the outer periphery of the middle of the hollow guide rod 11. Large rolling bearings 13 are respectively provided on the hollow guide rods 11 on the front and rear sides of the passive gear 12. The lower ends of the two large rolling bearings 13 are respectively fixed to the upper ends of the two brackets 14. A mounting hole 15 is provided in the middle of the bracket 14. A small rolling bearing 16 is installed in the mounting hole 15. An inner spline tube 17 is provided between the front and rear small rolling bearings 16. The inner spline tube 17 extends 5-10cm from the rear small rolling bearing 16. A driving gear 18 is fixed on the inner spline tube 17. The driving gear 18 is located below the passive gear 12. The driving gear 18 meshes with the passive gear 12. The rear end of the inner spline tube 17 is fixedly connected to the rotating shaft of a rotating device. The rotating device is not shown in the attached figure. The rotating device can be selected from a variety of small devices, such as an angle grinder, a handheld electric wrench or a micro rotating motor. The inner spline tube 17 is fixedly connected to the rotating shaft of these devices. The rotating device drives the inner spline tube 17 to rotate in the small rolling bearing 16. The inner spline tube 17 drives the driving gear 18 to rotate. The driving gear 18 drives the passive gear 12 to rotate. The passive gear 12 drives the hollow guide rod 11 to rotate in the large rolling bearing 13. The hollow guide rod 11 drives the truncated cone cutting head 1 to rotate together, thereby achieving the cutting of the water stop screw 8.

[0040] In order to make the device of the present invention more convenient to use and more beautiful in appearance, the present embodiment further comprises a rectangular parallelepiped housing 19, wherein a large hole 20 is provided on the upper front end surface of the housing 19, and the diameter of the large hole 20 is slightly larger than the diameter of the hollow guide rod 11, and the front end of the hollow guide rod 11 passes through the housing 19 from the large hole 20, and the rest of the hollow guide rod 11 is located inside the housing 19. A small hole 21 is provided on the upper rear end surface of the housing 19 at a position corresponding to the large hole 20, and the diameter of the small hole 21 is slightly larger than the diameter of the water stop screw 8, and the diameter of the small hole 21 is equal to the diameter of the center hole of the hollow guide rod 11. A lower hole 22 is provided on the lower rear end surface of the housing 19, and the inner spline tube 17 passes through the lower hole 22 backwards. Both brackets 14 are located in the housing 19, and the left and right ends of the bracket 14 are respectively fixed on the left and right inner walls of the housing 19, and the lower end of the bracket 14 is fixed on the inner bottom wall of the housing 19. To facilitate holding the device, handles 23 are also provided on the left and right sides of the housing 19.

[0041] The use process is as follows: hold the tool handle 23, align the tool with the screw eye 9, and let the water-stop screw 8 pass through the through hole 7 of the truncated cone cutting head 1, the hollow guide rod 11, and the small hole 21 of the outer shell 19 of the tool in turn, push the truncated cone cutting head 1 into the screw eye 9, and the arc blade 2 goes deep into the screw eye 9. As it pushes inward, the arc blade 2 is gradually squeezed by the inner wall of the screw eye 9, and the front end of the arc blade 2 gradually moves closer, and the alloy teeth 3 at the front end of the arc blade 2 gradually bite the water-stop screw 8. At this time, turn on the rotating device, which rotates the truncated cone cutting head 1 to rotate the water-stop screw 8. Perform circular cutting. During the cutting process, the frustum-shaped cutting head 1 can be continuously pushed into the screw eye 9 to increase the cutting depth. Generally, when the cutting depth reaches 5-8mm, the shear strength of the water-stop screw 8 at the cutting position will show a weak point, and the yield strength will be greatly reduced. At this time, the worker holds the outer end of the water-stop screw 8 and bends the water-stop screw 8 once or twice to break the water-stop screw 8 at the cutting position, thereby achieving the removal of the water-stop screw 8. Then, a blower is used to blow clean the floating slurry in the screw eye 9. After sprinkling water to moisten and clean the base layer, the screw eye 9 can be filled densely with expansive cement mortar.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-stop screw removal tool, characterized in that: The invention comprises a truncated cone cutting head (1), wherein the truncated cone cutting head (1) comprises four separated arc-shaped blades (2), the four arc-shaped blades (2) enclose a through hole (7), the front end inner wall of the arc-shaped blade (2) is provided with alloy teeth (3), the rear end edge of the arc-shaped blade (2) is provided with convex ribs (4), the convex ribs (4) of the four arc-shaped blades (2) are respectively inserted into four grooves (6) disconnected on the inner wall of a fixing ring (5), and the grooves (6) are arranged along the fixing ring (5) ) is evenly distributed around the inner wall, the opening of the groove (6) is small and the inner cavity is large, the arc length of the groove (6) is equal to the arc length of the rib (4), the inner cavity width of the groove (6) is greater than the width of the rib (4), and the inner cavity depth of the groove (6) is greater than the thickness of the rib (4). When the frustum-shaped cutting head (1) extends to the bottom of the screw eye (9), the alloy teeth (3) can bite the water stop screw (8); the rear of the fixing ring (5) is fixed with an annular sealing plate (10), and the annular sealing plate (10) ) has a middle hole diameter greater than that of the water-stop screw (8); the annular sealing plate (10) is fixed with a hollow guide rod (11) rearwardly, the middle hole diameter of the hollow guide rod (11) being greater than that of the water-stop screw (8); a passive gear (12) is fixed in the middle of the hollow guide rod (11); large rolling bearings (13) are provided on the hollow guide rods (11) at both front and rear sides of the passive gear (12); the lower end of the large rolling bearing (13) is fixed to the upper end of a bracket (14); the bracket (14) is provided with a mounting hole (15); a small rolling bearing (16) is installed in the mounting hole (15); an inner spline tube (17) is provided between the front and rear small rolling bearings (16); a driving gear (18) is fixed on the inner spline tube (17); the driving gear (18) is meshed with the passive gear (12); the inner spline tube (17) extends from the small rolling bearing (16) at the rear; and the rear end of the inner spline tube (17) is fixedly connected to the rotating shaft of the rotating device.

2. The water-stop screw removal tool according to claim 1, characterized in that: The housing (19) further comprises a housing (19), wherein a large hole (20) is provided on the front end surface of the upper portion of the housing (19), wherein the diameter of the large hole (20) is larger than the diameter of the hollow guide rod (11), and the front end of the hollow guide rod (11) passes through the housing (19) from the large hole (20); a small hole (21) is provided on the rear end surface of the upper portion of the housing (19) at a position corresponding to the large hole (20), wherein the diameter of the small hole (21) is larger than the diameter of the water stop screw (8); a lower hole (22) is provided on the rear end surface of the lower portion of the housing (19), and the inner spline tube (17) passes through the lower hole (22); the bracket (14) is located in the housing (19), and the left and right ends of the bracket (14) are respectively fixed to the left and right inner walls of the housing (19), and the lower end of the bracket (14) is fixed to the inner bottom wall of the housing (19).

3. The water-stop screw removal tool according to claim 2, characterized in that: Handles (23) are provided on the left and right sides of the housing (19).

4. The water-stop screw removal tool according to claim 2 or 3, characterized in that: The outer shell (19) is a rectangular parallelepiped shell.

5. The water-stop screw removal tool according to claim 4, characterized in that: The rotating device is an angle grinder, a handheld electric wrench or a micro rotating motor.

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