Plug-in expansion screw

Abstract

The utility model discloses a plug-in type expansion screw, which belongs to the technical field and comprises an expansion pipe and a sleeve, the sleeve is positioned above the expansion pipe, the device is placed in a pre-reserved drill hole, and then a tool is used for rotating an end cap, so that the end cap drives a screw rod to rotate, the screw rod rotates in a nut at the moment, and the screw rod rotates in the nut. When the expansion screw is pulled by external force, the top ends of the warped pieces are all inserted into the inner wall of the drill hole, the warped pieces are used for clamping the inner wall of the drill hole, and therefore the expansion screw is prevented from being damaged, and the service life of the expansion screw is prolonged. According to the plug-in type expansion screw, the tension can be increased, the plug-in type expansion screw is tighter when being pulled, the stability of the expansion screw in use can be effectively improved, the stability of the nut can be improved through the fixing mechanism, and the nut can be prevented from rotating in the rotating process of the screw rod.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to an insertable expansion screw. Background Art

[0002] Insertion-type expansion screws, also called expansion bolts or expansion nails, are a type of fastener that utilizes a wedge-shaped slope to promote expansion and generate frictional gripping force to achieve a fixing effect. It is mainly composed of a screw, an expansion tube, and other accessories (such as spring washers and flat washers). When using an ordinary expansion screw, it is necessary to insert the expansion screw into a pre-set drill hole, and then use a tool to turn the nut on the expansion screw. At this time, the nut rotates on the screw of the expansion screw, causing the cylinder to expand or the flap to bend and contact the hole wall. However, at this time, the expansion screw is mainly fixed by the friction between the flap and the wall, and will fall off under a large pulling force. Therefore, the utility model provides an insertion-type expansion screw that can effectively solve the above-mentioned problems. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and provides an insertion type expansion screw.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: comprising an expansion tube and a casing, the casing is located above the expansion tube, a plurality of flaps are arranged in an annular array on the upper part of the expansion tube, the lower outer wall of the casing is in conflict with the upper inner wall of the flap, a screw is inserted and slidably penetrated in the casing, the top end of the screw extends to the top of the casing and is fixedly connected with an end cap, a fixing mechanism is arranged at the bottom end of the expansion tube, a nut is connected to the bottom end of the expansion tube through the fixing mechanism, the bottom end of the screw penetrates the expansion tube and the nut and extends to the bottom of the nut, the screw and the nut are threadedly connected, the fixing mechanism comprises a fixing box fixed on both sides of the bottom surface of the expansion tube, an insert is slidably arranged in the fixing box, one end of the insert penetrates the fixing box and extends to the outside of the fixing box and is fixedly connected with a pull plate, the insert is fixedly connected with a slide plate, the slide plate is slidably connected in the fixing box, a slot is arranged on the nut, one end of the insert penetrates the fixing box and is inserted in the slot, and a spring is sleeved on the insert.

[0005] As a further description of the above technical solution:

[0006] The upper part of the lift piece close to the sleeve and the lower outer wall of the sleeve are both arranged in an arc shape.

[0007] As a further description of the above technical solution:

[0008] A limiting plate is provided at the top end of the sleeve, and the top end of the limiting plate abuts against the bottom end of the end cap.

[0009] As a further description of the above technical solution:

[0010] The bottom end of the limiting plate is fixedly connected to the top end of the sleeve.

[0011] As a further description of the above technical solution:

[0012] The nut is provided with an internal thread matched with the screw rod.

[0013] As a further description of the above technical solution:

[0014] The two ends of the spring are fixedly connected to the slide plate and the fixed box respectively.

[0015] As a further description of the above technical solution:

[0016] The limiting plate is provided with a through hole matching the screw rod.

[0017] The utility model has the following beneficial effects:

[0018] In the utility model, the device is placed in a pre-reserved drill hole, and then the end cap is rotated by a tool, so that the end cap drives the screw to rotate, and the screw will rotate in the nut, so that the nut drives the sleeve to move in the direction of the sleeve, and the warp is bent under the action of the sleeve, so that the top of the warp is in conflict with the inner wall of the drill hole, and when the expansion screw is pulled by an external force, the top of the warp is inserted into the inner wall of the drill hole, and the warp bites the inner wall of the drill hole, so that the pulling force can be increased, and the inserted expansion screw is pulled tighter and tighter, thereby effectively improving the stability of the expansion screw when in use, and the stability of the nut can be improved by the fixing mechanism, and the nut can be prevented from rotating during the rotation of the screw. The utility model can effectively improve the stability of the expansion screw when in use by changing the bending direction of the warp, thereby effectively improving the safety of the expansion screw when in use, and improving the practicality of the expansion screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an insertable expansion screw proposed by the utility model;

[0020] Figure 2 This is a cross-sectional schematic diagram of an insertable expansion screw proposed by the utility model;

[0021] Figure 3 This is an enlarged schematic diagram of point A of an insertable expansion screw proposed by the utility model.

[0022] Legend:

[0023] 1. lifter; 2. sleeve; 3. spring; 4. limit plate; 5. end cap; 6. screw; 7. nut; 8. expansion tube; 9. pull plate; 10. fixing box; 11. slide plate; 12. plug-in block; 13. slot; 14. fixing mechanism. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference Figure 1-Figure 3 The utility model provides an embodiment: comprising an expansion tube 8 and a casing 2, characterized in that: the casing 2 is located above the expansion tube 8, a plurality of flaps 1 are arranged in an annular array on the upper part of the expansion tube 8, the lower outer wall of the casing 2 is in contact with the upper inner wall of the flap 1, a screw 6 is inserted and slidably penetrated in the casing 2, the top end of the screw 6 extends to the top of the casing 2 and is fixedly connected with an end cap 5, a fixing mechanism 14 is arranged at the bottom end of the expansion tube 8, a nut 7 is connected to the bottom end of the expansion tube 8 through the fixing mechanism 14, the bottom end of the screw 6 penetrates the expansion tube 8 and the nut 7 and extends to the bottom of the nut 7, the screw 6 is threadedly connected to the nut 7, the fixing mechanism 14 includes a fixing box 10 fixed on both sides of the bottom surface of the expansion tube 8, a plug block 12 is slidably arranged in the fixing box 10, one end of the plug block 12 penetrates the fixing box 10 and extends to the outside of the fixing box 10 and is fixedly connected with a pull plate 9, the plug block 12 is fixedly connected to a slide plate 11, the slide plate 11 is slidably connected in the fixing box 10, a slot 13 is opened on the nut 7, one end of the plug block 12 penetrates the fixing box 10 and is inserted in the slot 13, and a spring 3 is sleeved on the plug block 12.

[0026] The upper part of the side of the lift piece 1 close to the sleeve 2 and the lower outer wall of the sleeve 2 are both arc-shaped. By arranging an arc structure at the upper part of the lift piece 1 and the lower part of the sleeve 2, the contact area between the lift piece 1 and the sleeve 2 can be reduced, thereby reducing the friction between the lift piece 1 and the sleeve 2, and making it easier for the lift piece 1 to be bent through the sleeve 2. A limit plate 4 is provided at the top of the sleeve 2, and the limit plate 4 can act as a gasket. The top of the limit plate 4 is in contact with the bottom end of the end cap 5, and the bottom end of the limit plate 4 is fixedly connected to the top of the sleeve 2. An internal thread matching the screw 6 is provided in the nut 7, and the two ends of the spring 3 are respectively fixedly connected to the slide plate 11 and the fixing box 10, and a through hole matching the screw 6 is opened through the limit plate 4.

[0027] Working principle: Place the device into a pre-reserved drill hole, and then use a tool to rotate the end cap 5, so that the end cap 5 drives the screw 6 to rotate. At this time, the screw 6 will rotate in the nut 7, so that the nut 7 drives the casing 2 to move in the direction of the casing 2. At this time, the lifter 1 is bent under the action of the casing 2, so that the top of the lifter 1 is in conflict with the inner wall of the drill hole. When the expansion screw is pulled by an external force, the top of the lifter 1 is inserted into the inner wall of the drill hole. By using the lifter 1 to bite the inner wall of the drill hole, the pulling force can be increased, and the inserted expansion screw can be tightened, thereby effectively improving the stability of the expansion screw during use. The fixing mechanism 14 can improve the stability of the nut 7, and the rotation of the nut 7 during the rotation of the screw 6 can be avoided.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An insertable expansion screw, comprising an expansion tube (8) and a casing (2), characterized in that: The casing (2) is located above the expansion tube (8). The upper annular array of the expansion tube (8) is provided with a plurality of flaps (1). The lower outer wall of the casing (2) contacts the upper inner wall of the flaps (1). A screw (6) is slidably inserted into the casing (2). The top end of the screw (6) extends to the top of the casing (2) and is fixedly connected to an end cap (5). The bottom end of the expansion tube (8) is provided with a fixing mechanism (14). The bottom end of the expansion tube (8) is connected to a nut (7) through the fixing mechanism (14). The bottom end of the screw (6) passes through the expansion tube (8) and the nut (7) and extends to the bottom of the nut (7). The screw (6) The fixing mechanism (14) is threadedly connected to the nut (7), and comprises a fixing box (10) fixedly arranged on both sides of the bottom surface of the expansion tube (8). An insert block (12) is slidably arranged in the fixing box (10). One end of the insert block (12) passes through the fixing box (10) and extends to the outside of the fixing box (10) and is fixedly connected with a pull plate (9). The insert block (12) is fixedly connected with a slide plate (11), and the slide plate (11) is slidably connected in the fixing box (10). A slot (13) is provided on the nut (7). One end of the insert block (12) passes through the fixing box (10) and is inserted in the slot (13). A spring (3) is sleeved on the insert block (12).

2. The insertable expansion screw according to claim 1, characterized in that: The upper part of the lift piece (1) close to the sleeve (2) and the lower outer wall of the sleeve (2) are both arranged in an arc shape.

3. The insertable expansion screw according to claim 1, characterized in that: A limiting plate (4) is provided at the top end of the sleeve (2), and the top end of the limiting plate (4) abuts against the bottom end of the end cap (5).

4. The insertable expansion screw according to claim 3, characterized in that: The bottom end of the limiting plate (4) is fixedly connected to the top end of the sleeve (2).

5. The insertable expansion screw according to claim 1, characterized in that: The nut (7) is provided with an internal thread matched with the screw rod (6).

6. The insertable expansion screw according to claim 1, characterized in that: The two ends of the spring (3) are fixedly connected to the slide plate (11) and the fixed box (10) respectively.

7. The insertable expansion screw according to claim 3, characterized in that: The limiting plate (4) is provided with a through hole which matches the screw rod (6).

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