Top plate wire box nail taking tool

Abstract

The utility model discloses a tool for taking out a nail from a top plate wire box. The tool comprises a steel pipe, a plurality of vertical steel bars are welded at the top end of the steel pipe, are uniformly distributed around the circumference of the axis of the steel pipe and are used for forming a multi-edge hollow cylinder at the top of the steel pipe; the center of the multi-edge hollow cylinder is an accommodating space for accommodating a positioning pin of the wire box; when the positioning pin is inserted into the accommodating space, the positioning pin is clamped by the plurality of steel bars; a holding structure is arranged on the outer side of the upper portion of the multi-edge hollow cylinder and used for preventing the upper ends of the steel bars from expanding outwards. The tool is simple in structure, easy to manufacture, low in cost and suitable for being used in a construction site, the positioning pin in the top plate wire box can be pulled out quickly and conveniently in a labor-saving mode, high-altitude operation is avoided, and construction efficiency and safety are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction and relates to a tool for removing nails from a ceiling wire box. Background Art

[0002] Electrical junction boxes are often buried in concrete columns, walls, roofs and ceilings. The wire box located on the ceiling is pre-buried before the ceiling is poured. After the concrete solidifies, the formwork is removed, and the lower end of the wire box is exposed on the ceiling surface. Among them, in order to fix the position of the wire box on the ceiling, positioning pins are usually inserted into the top end of the wire box. For example, as shown in the patent "A Method for Embedding Electrical Junction Boxes in Concrete Pouring Structures" with the publication number CN112993899A, the iron nails in this patent play a positioning role. However, after the formwork is removed, the pins need to be removed to avoid affecting the wire threading construction. Usually, the pins in the wire boxes on the wall can be easily removed by pliers. The problem is that the pins in the ceiling wire boxes are at a relatively high position. If pliers are used, support objects such as ladders or brackets need to be used to reach the pins on the ceiling. When constructing on the same floor, if there are many ceiling wire boxes, removing multiple pins requires frequent movement of the ladder and repeated climbing up and down, which is time-consuming and laborious and very inconvenient. In the prior art, for example, in the patent "A Ceiling Wire Box Nail Remover" with the publication number CN212042915U, such a device includes a pair of openable and closable jaws, which are arranged at the top of a vertical rod and are used to cut the pins; the operator stands on the ground to operate, thus avoiding working at heights. The problem with such a device is that the structure of the jaw opening and closing mechanism is complex and bulky, and its openable and closable jaws are difficult to extend into a narrow wire box, and it is not suitable for removing the pins in the ceiling wire boxes. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a tool for removing nails from a ceiling wire box. The purpose is to design a clamping structure at the top of the hand-held rod to clamp and remove the pins located in the ceiling wire box, so that the operator can operate on the ground, avoid climbing support objects, and improve safety and construction convenience.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A tool for removing nails from a ceiling wire box, including a steel pipe; a plurality of vertical steel bars are welded to the top end of the steel pipe, and the plurality of steel bars are circumferentially distributed around the axis of the steel pipe to form a multi-sided hollow cylinder at the top of the steel pipe; the center of the multi-sided hollow cylinder is a receiving space for receiving the positioning pins of the wire box; when the positioning pins are inserted into the receiving space, the plurality of steel bars clamp the positioning pins; a clamping structure is arranged on the outer side of the upper part of the multi-sided hollow cylinder to prevent the upper ends of the steel bars from spreading outwards.

[0005] As a further optimization, the steel bars are threaded steel bars with threads on the outer side.

[0006] As a further optimization, the clamping structure is a steel sleeve sleeved outside the multi-faceted hollow cylinder; the steel sleeve is fixedly connected to the steel bar.

[0007] As a further optimization, a chamfer is provided on the inner side of the upper port edge of the steel bar for guiding the positioning pin to be inserted into the accommodation space.

[0008] As a further optimization, the number of the steel bars is 3 to 8; the length of the steel bar is 10 to 20 cm.

[0009] As a further optimization, the upper side walls of two adjacent steel bars are welded, and the clamping structure is a weld bead formed by welding two adjacent steel bars.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: the structure of the present utility model is simple, easy to manufacture, low in cost, suitable for use at the construction site, and can quickly, conveniently and labor-savingly pull out the positioning pin in the top plate junction box, avoiding high-altitude operation and improving the construction efficiency and safety. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram when the tool of Embodiment 1 of the present utility model is in use;

[0012] Figure 2 It is a radial sectional view of the tool of Embodiment 1 of the present utility model;

[0013] Figure 3 It is an axial sectional view of the tool of Embodiment 1 of the present utility model;

[0014] Figure 4 It is a radial sectional view of the tool of Embodiment 2 of the present utility model.

[0015] The corresponding relationship between the technical features in the figure and the reference numerals is: steel pipe 1; steel bar 2; accommodation space 21; chamfer 22; junction box 3; top plate 31; positioning pin 32; threading pipe 33; steel sleeve 4; weld bead 41. Detailed Embodiment

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0017] Embodiment 1, please refer to Figures 1-3, the present utility model provides a technical solution: a tool for removing nails from a ceiling wire box, including a steel pipe 1; a plurality of vertical steel bars 2 are welded to the top end of the steel pipe 1, and the plurality of steel bars 2 are circumferentially and evenly distributed around the axis of the steel pipe 1, so as to form a multi-sided hollow cylinder at the top of the steel pipe 1; the center of the multi-sided hollow cylinder is a receiving space 21 for receiving the positioning pin 32 of the wire box 3; when the positioning pin 32 is inserted into the receiving space 21, the plurality of steel bars 2 clamp the positioning pin 32; a clamping structure is provided on the outer side of the upper part of the multi-sided hollow cylinder to prevent the upper ends of the steel bars 2 from spreading outwards. In this embodiment, an example is given where the multi-sided hollow cylinder is assembled by five steel bars 2.

[0018] When manufacturing the tool of this embodiment, it is preferred that the steel bar 2 is a threaded steel bar with threads on the outer side, and the outer surface of the steel bar 2 is rough, which is beneficial to improving the friction force. It is preferred that the steel sleeve 4 is the steel sleeve 4. When manufacturing, waste heads of threaded steel bars are used, and the number of waste heads is 3 to 8, and their thicknesses can be inconsistent, and the length of the waste heads is 10 to 20 cm. First, insert several threaded steel bars into the steel sleeve 4, and then insert a columnar object with the same thickness as the positioning pin 32 in the wire box 3 into the centers of the plurality of threaded steel bars. The columnar object is preferably the original positioning pin 32 to serve as a core mold; then, continuously insert the threaded steel bars into the gap between the core mold and the steel sleeve 4 until the core mold is clamped and fixed; then, weld the steel sleeve 4 and the threaded steel bars to form a multi-sided hollow cylinder, and then weld the lower end of the multi-sided hollow cylinder to the top end of the steel pipe 1. Finally, pull out the core mold, and the tool is manufactured.

[0019] When using the tool of this embodiment, hold the steel pipe 1 by hand, align it with the positioning pin 32 in the wire box 3 fixed in the top plate 31, and push it upward; when the positioning pin 32 is inserted into the accommodation space 21, it is restricted by the clamping structure, and the inner side of the steel strip 2 closely adheres to the positioning pin 32 to clamp it; during the upward pushing process, hold the lower end of the steel pipe 1 by hand and swing it cyclically with the positioning pin 32 as the reference. On the one hand, the cyclic swinging facilitates the deep insertion of the positioning pin 32 into the multi-faceted hollow cylinder. On the other hand, the cyclic swinging can also loosen the connection between the positioning pin 32 and the concrete of the top plate 31. When the upper end of the multi-faceted hollow cylinder touches the top of the branch wire box 3, the insertion of the positioning pin 32 is completed. Then, continue to swing the steel pipe 1 cyclically to further loosen the positioning pin 32; then, with the positioning pin 32 as the base point, hold the lower end of the steel pipe 1 and translate it a certain distance in one direction, so that the accommodation space 21 is misaligned with the positioning pin 32. Utilize the elastic deformation ability of the positioning pin 32 itself to make the positioning pin 32 closely fit with the steel strip 2 to increase the friction force. At the same time, pull down the steel pipe 1 and use the friction force to pull out the positioning pin 32 downward. In other words, the misalignment is to drive the steel pipe 1 to move in the direction of bending the positioning pin 32. Since the length of the steel pipe 1 is relatively long, with the positioning pin 32 as the fixed point, a lever force is formed, and the positioning pin 32 can be bent with less effort. The slightly bent positioning pin 32 is misaligned with the accommodation space 21, so that a larger friction force can be obtained. This friction force is used as the clamping force when pulling out the positioning pin 32, and the magnitude of this friction force depends on the deformation amount of the positioning pin 32. That is to say, the more severely the positioning pin 32 is bent, the greater the friction force. If the positioning pin 32 cannot be pulled out at one time, the steel pipe 1 can be continued to be swung to further loosen the positioning pin 32 on the top plate 31 until it is pulled out. Among them, multiple steel strips 2 surrounding the positioning pin 32 endow the multi-faceted hollow cylinder itself with a certain elastic deformation ability, that is, the stiffness of the upper end of the steel pipe 1 is lower than that of the steel pipe 1 itself. Therefore, when driving the steel pipe 1 to move in the direction of bending the positioning pin 32, the deformation of the steel pipe 1 itself is concentrated on the multi-faceted hollow cylinder at the top end of the steel pipe 1, that is, the accommodation space 21 also has deformation ability, so that the misalignment is more serious. The more serious the misalignment is, the greater the friction force on the positioning pin 32 when pulling down the steel pipe 1. Therefore, the clamping force on the positioning pin 32 in this embodiment comes from the increased extrusion force between the positioning pin 32 and the side wall of the steel strip 2 after the deformation of the steel strip 2 and the positioning pin 32 itself, and the obtained friction force. Among them, the restriction of the clamping structure makes the deformation of the multi-faceted hollow cylinder not located at its upper open end, that is, the middle part of the multi-faceted hollow cylinder can be deformed, but the upper end of the steel strip 2 is not allowed to open outward to expand the open end, so as to avoid the positioning pin 32 falling out from the open end when pulling down.

[0020] Preferably, in order to facilitate the insertion of the positioning pin 32 into the multi-faceted hollow cylinder, a chamfer 22 is provided on the inner side of the upper port edge of the steel bar 2 for guiding the positioning pin 32 to insert into the accommodation space 21.

[0021] The advantages of this embodiment are that the structure of this embodiment is simple, easy to manufacture, low in cost, suitable for use at the construction site, and can quickly, conveniently and labor-savingly pull out the positioning pin 32 in the wire box 3 of the top plate 31, avoiding high-altitude operations and improving the construction efficiency and safety.

[0022] Embodiment 2, please refer to Figure 4 ; Based on Embodiment 1, the difference is that the manufacturing method of the tool is different.

[0023] When manufacturing the multi-faceted hollow cylinder, the steel sleeve 4 is not welded to the threaded steel bar, but the sides of two adjacent threaded steel bars are welded. Since multiple threaded steel bars are distributed in a ring shape, when the sides of all adjacent two threaded steel bars are welded, a whole is formed, that is, the multi-faceted hollow cylinder. Thus, the steel sleeve 4 can be removed. In other words, the upper side walls of two adjacent steel bars 2 are welded, and the holding structure is the weld bead 41 formed by welding two adjacent steel bars 2.

[0024] The advantages of this embodiment are that on the basis of the advantages of Embodiment 1, the steel sleeve 4 can be removed; when manufacturing another nail-pulling tool, it can still be used as a welding fixture and can be reused. Coupled with the positioning pin 32 component in Embodiment 1, it can also be reused, thus facilitating the quick manufacture of another nail-pulling tool. Multiple nail-pulling tools are distributed to multiple people for use, thereby further improving the construction efficiency.

[0025] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tool for removing nails from a top board box, comprising a steel pipe (1); characterized in that: A plurality of vertical steel bars (2) are welded to the top of the steel pipe (1), and the plurality of steel bars (2) are evenly distributed around the circumference of the axis of the steel pipe (1) to form a multi-faceted hollow cylinder at the top of the steel pipe (1); the center of the multi-faceted hollow cylinder is a receiving space (21) for receiving a positioning pin (32) of the wire box (3); when the positioning pin (32) is inserted into the receiving space (21), the plurality of steel bars (2) clamp the positioning pin (32); A clamping structure is provided on the outer side of the upper part of the polygonal hollow cylinder, which is used to prevent the upper end of the steel bar (2) from opening outwards.

2. A tool for removing nails from a top board box according to claim 1, characterized in that: The steel bar (2) is a threaded steel bar with threads on the outer side.

3. A tool for removing nails from a top board box according to claim 1, characterized in that: The clamping structure is a steel sleeve (4) sleeved on the outside of the multi-faceted hollow cylinder; the steel sleeve (4) is fixedly connected to the steel bar (2).

4. A tool for removing nails from a top board box according to claim 1, characterized in that: A chamfer (22) is provided on the inner side of the upper end edge of the steel bar (2) for guiding the positioning pin (32) to be inserted into the accommodating space (21).

5. A tool for removing nails from a top board box according to claim 1, characterized in that: The number of the steel bars (2) is 3 to 8; the length of the steel bars (2) is 10 to 20 centimeters.

6. A tool for removing nails from a top board box according to claim 1, characterized in that: The upper side walls of two adjacent steel bars (2) are welded, and the clamping structure is a weld nodule (41) formed by welding the two adjacent steel bars (2).

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