CN221237017U - Expansion screw sleeve and expansion screw combination device thereof - Google Patents

Abstract

The utility model discloses an expansion screw sleeve and a combination device of an expansion screw thereof, which comprises a screw rod, a screw sleeve, a screw cap and a gasket, wherein the screw rod is positioned in the screw sleeve, the screw sleeve is extended from the top end of the screw rod to be attached to the gasket, and the expansion screw sleeve is fixed through the screw cap, and the combination device is characterized in that: the cylinder wall of the screw sleeve is provided with an abutting block corresponding to the inclined groove, the top of the screw sleeve is provided with an annular baffle plate, the bottom of the screw sleeve is provided with a plurality of cutting slits, two adjacent cutting slits form an expansion part, and the inner wall of the screw sleeve is provided with a baffle block; the upper end of the screw rod is provided with a thread section, the middle part of the screw rod is provided with a plurality of inclined grooves, and the bottom of the screw rod is provided with an expansion head. The utility model improves the fixing effect after installation, increases the friction force with the wall body and avoids the problem that the expansion screw falls off.

Description

Expansion screw sleeve and expansion screw combination device thereof

Technical Field

The utility model relates to the technical field of fixing parts, in particular to an expansion screw sleeve and an expansion screw combination device thereof.

Background

The expansion screw is generally a metal expansion screw, and the expansion screw is fixed by utilizing wedge-shaped inclination to promote expansion to generate friction grip force so as to achieve the fixing effect. The existing expansion screw consists of a screw rod, an expansion pipe and other parts, the tail part of the screw rod is conical, the inner diameter of the cone is larger than that of the expansion pipe, when the nut is screwed up, the screw rod moves outwards, the cone part moves through axial movement of the screw thread, so that a large positive pressure is formed on the outer peripheral surface of the expansion pipe, and the angle of the cone is small, so that friction self-locking is formed among the wall body, the expansion pipe and the cone, and the fixing effect is achieved.

The expansion screw at the present stage is fixed only by expanding the expansion pipe and generating friction bond with the wall body because the expansion pipe is arranged in the pre-punched blind hole, the screw is screwed into the expansion pipe, the expansion pipe is fixed not very firmly, and especially when encountering a relatively soft wall body, the friction bond generated by the wall body to the expansion pipe can be greatly reduced, so that the fixing effect is poor and the wall body is easy to fall off.

Disclosure of Invention

The present utility model is directed to an expansion screw sleeve and an assembly device for an expansion screw, which solve the above-mentioned problems.

In order to achieve the above purpose, the present utility model provides the following technical solutions: an expansion screw sleeve and an expansion screw combination device thereof comprise a screw rod and a screw sleeve, wherein the screw rod is inserted into the screw sleeve and fixed by a gasket and a screw cap; the screw rod comprises a threaded section positioned at the upper part of the screw rod, an inclined groove below the threaded section and an expansion head at the bottom of the screw rod; the screw sleeve comprises an abutting block positioned on the cylinder body, a plurality of groups of cutting slits are formed in the bottom of the screw sleeve, an expansion part is formed between the cutting slits, a baffle is arranged at the top of the cylinder, and a baffle is arranged on the inner wall of the cylinder.

Preferably, the inclined grooves are uniformly formed in the periphery of the screw rod, and the number of the inclined grooves is 4, and the inclined grooves are formed in an upper group and a lower group.

Preferably, the shape of the inclined groove is matched with that of the abutting block, the screw rod moves upwards after the nut is fastened, the abutting block is driven to move transversely, friction force is increased when the abutting block contacts with the wall, and the fixing is firmer.

Preferably, the expansion head is tapered.

Preferably, the upper end of the expansion head is consistent with the inner wall of the expansion part of the screw sleeve in size and is positioned below the expansion part.

Preferably, the baffle is positioned around the top of the screw sleeve, the size of the baffle is consistent with that of the gasket, the baffle is contacted with the wall body to increase stability, and the screw sleeve is protected from being damaged by the powerful rotation of the nut.

Preferably, the thread section at the top of the screw rod is matched with the screw cap, and the screw cap is rotated to generate fastening force.

Preferably, the stop is located on the inner wall of the screw sleeve, and stops the movement of the screw rod when the screw rod rotates, so that the inclined groove and the abutting block cannot be separated due to rotation.

Preferably, when the device works, the screw rod is driven by the rotating nut to move upwards, the expansion head at the bottom of the screw rod moves upwards, the expansion part is extruded to be separated from the wall body along the kerf to generate contact with the wall body to increase friction force, and when the screw rod moves upwards, the inclined groove is contacted with the abutting block to drive the abutting block to be unfolded to the periphery to contact with the wall surface to increase friction force.

Compared with the prior art, the utility model has the beneficial effects that: according to the expansion screw sleeve and the expansion screw combination device thereof, through the combination of the expansion part and the abutting block, the product has more contact area with the wall, the friction grip is increased, the fastening effect is stronger, and falling is not easy to occur.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a cross-sectional view of a portion of the structure of the present utility model;

FIG. 3 is a cross-sectional view of a sleeve structure of the present utility model;

FIG. 4 is a schematic view of a lead screw according to the present utility model;

FIG. 5 is a block diagram of a nut and washer of the present utility model;

FIG. 6 is a schematic view of an expanded plane of the screw sleeve according to the present utility model.

In the figure: 1. a screw rod; 101. a threaded section; 102. an inclined groove; 103. an expansion head; 2. a screw sleeve; 201. an abutment block; 202. cutting; 203. an expansion section; 204. a baffle; 3. a screw cap; 4. a gasket; 5. a baffle block.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-6, the present utility model provides a technical solution: an expansion screw sleeve and an expansion screw combination device thereof comprise a screw rod 1, a screw sleeve 2, a screw cap 3 and a gasket 4; the screw rod 1 is located inside the screw sleeve 2, the screw sleeve 2 is attached to the gasket 4 by extending out of the top end of the screw rod 1, and the screw rod is fixed through the screw cap 3.

As an embodiment of the present utility model, the upper end portion of the screw rod 1 is provided with a thread section 101, the middle portion of the screw rod 1 is provided with a plurality of inclined grooves 102, and the bottom portion of the screw rod 1 is provided with an expansion head 103.

As an embodiment of the utility model, the threaded section 101 and the nut 3 are screwed.

As an embodiment of the present utility model, the inclined grooves 102 are uniformly distributed along the axial direction of the lead screw 1, the number of the inclined grooves 102 is 4, and the inclined grooves 102 are arranged in two groups up and down.

As an embodiment of the present utility model, the expansion head 103 is tapered.

As an embodiment of the present utility model, the wall of the screw socket 2 is provided with an abutment block 201 corresponding to the inclined groove 102, the top of the screw socket 2 is provided with an annular baffle 204, the bottom of the screw socket 2 is provided with a plurality of slits 202, two adjacent slits 202 form an expansion part 203, the inner wall of the screw socket is provided with a baffle 5, and the inclined groove 102 and the abutment block 201 are prevented from separating after the screw rod 1 rotates.

In one embodiment of the present utility model, the size of the baffle 204 is identical to the size of the spacer 4.

The working principle of the utility model is as follows: the expansion screw is placed in a hole of a wall body, the screw cap 3 is rotated, the screw rod 1 moves upwards, the expansion head 103 moves upwards to squeeze the expansion part 203, the expansion part 203 expands around along the cutting joint 202 to be attached to the wall body, the inclined groove 102 moves upwards to pull the abutting block 201 to expand to the outer side of the screw sleeve 2, the expansion screw is contacted with the wall body, the contact area with the hole of the wall body is increased through the cooperation of the expansion part 203 and the abutting block 201, the friction grip is increased, the fastening effect is stronger, and falling is not easy to occur.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides an expansion screw sleeve and expansion screw's composite set, includes screw pole (1), screw sleeve (2), nut (3) and gasket (4), screw pole (1) are located inside screw sleeve (2), and screw sleeve (2) and gasket (4) laminating are extended on the top of screw pole (1), fix its characterized in that through nut (3): the cylinder wall of the screw sleeve (2) is provided with an abutting block (201) corresponding to the inclined groove (102), the top of the screw sleeve (2) is provided with an annular baffle (204), the bottom of the screw sleeve (2) is provided with a plurality of slits (202), two adjacent slits (202) form an expansion part (203), and the inner wall of the screw sleeve is provided with a baffle block (5).

2. An expansion screw sleeve and its assembly according to claim 1, wherein: the size of the baffle plate (204) is consistent with that of the gasket (4).

3. An expansion screw sleeve and its assembly according to claim 1, wherein: the screw rod is characterized in that a thread section (101) is arranged at the upper end part of the screw rod (1), a plurality of inclined grooves (102) are formed in the middle of the screw rod (1), and an expansion head (103) is arranged at the bottom of the screw rod (1).

4. A combination of an expansion screw sleeve and an expansion screw according to claim 3, wherein: the thread section (101) is in threaded connection with the nut (3).

5. The expansion screw sleeve and expansion screw assembly of claim 4, wherein: the inclined grooves (102) are uniformly distributed along the axial direction of the screw rod (1), one group of the inclined grooves (102) is 4, and two groups of the inclined grooves (102) are arranged up and down.

6. The expansion screw sleeve and expansion screw assembly according to claim 5, wherein: the expansion head (103) is conical.