CN219220972U

CN219220972U - Thermal insulation nail with expansion assembly

Info

Publication number: CN219220972U
Application number: CN202120825825.2U
Authority: CN
Inventors: 李诗全; 陈小珍
Original assignee: Fuzhou Baiyibaili Automation Technology Co ltd
Current assignee: Fuzhou Baiyibaili Automation Technology Co ltd
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2023-06-20
Anticipated expiration: 2031-04-21

Abstract

The utility model discloses a heat preservation nail provided with an expansion assembly, wherein the expansion assembly consists of a sleeve and an expansion moving part, the sleeve is connected with the expansion moving part in a combined or embedded way, a first hole is formed in the middle of the sleeve, a slotted hole is formed in the outer wall of the sleeve, and the first hole is used for screwing in a screw; the connecting piece is arranged at the top of the sleeve, a second hole is further formed in the connecting piece, the second hole corresponds to the first hole, the rack is arranged on the connecting piece, the rack is positioned at one side, close to the sleeve, of the connecting piece, and the rack is matched with the slotted hole; and an internal tooth pattern is also arranged on one side of the rack, which is close to the first hole. In the above technical scheme, the expansion moving part is detachably arranged on the sleeve, and the heat preservation nail provided with the expansion assembly improves the stability of the expansion nail fixing object through the two expansion modes of the rack and the screw and the sleeve and the screw.

Description

Thermal insulation nail with expansion assembly

Technical Field

The utility model relates to the technical field of expansion nails or heat preservation nails, in particular to a heat preservation nail provided with an expansion assembly.

Background

The heat insulation nail is an expansion nail for fixing a heat insulation board, is also called an expansion bolt, and is a fixing member frequently used in the field of construction. The existing expansion screws are mainly divided into two main categories: firstly, arranging a plurality of cutting slits on the peripheral surface of an expansion pipe, when the expansion pipe is used, firstly placing the expansion pipe into a mounting hole, then screwing a screw into the expansion pipe, and as the screw is screwed into the expansion pipe, expanding the expansion pipe from the cutting slits by the rear end of the screw, wherein the outer surface of the expanded part of the expansion pipe is contacted with the wall of the mounting hole so as to fasten the screw into the mounting hole; secondly, a plurality of cutting slits are formed in one end, far away from the hole, of the expansion pipe, the rear end of the screw rod is provided with a spherical end, when the expansion pipe is used, the screw rod sleeved with the expansion pipe is placed into the installation hole, the front end of the expansion pipe is propped against the outside of the installation hole, then the screw rod is pulled out from the outside of the installation hole, and finally the spherical end on the screw rod enters the inside of the expansion pipe to prop up the rear end of the expansion pipe, so that the screw rod is fixed in the installation hole.

The common expansion screw is divided into a screw part and an expansion part, the screw is detached firstly to fix the expansion part when the expansion screw is used, and then the screw penetrates through the expansion part to be fixed for a plurality of times, but the repeated operation is complicated, the conventional expansion screw is not very reliable in fixation, unstable in fixation and very easy to loosen, and if the load has large vibration, the loosening can occur.

Disclosure of Invention

Therefore, it is desirable to provide a heat preservation nail with an expansion assembly, which improves the stability of the fixed object of the expansion nail.

In order to achieve the above object, the present utility model provides a heat insulation nail provided with an expansion assembly, wherein the expansion assembly consists of a sleeve and an expansion moving member; the sleeve is connected with the expansion moving part in a combined or embedded way, a first hole is formed in the middle of the sleeve, the hole opening of the first hole is a screw screwing end, a slotted hole is formed in the outer wall of the sleeve, and the screw screwing end and the first hole of the sleeve are used for screwing in a screw;

the expansion moving part comprises more than two racks, or: the expansion moving piece comprises a rack and a connecting piece connected with the rack;

when the expansion moving part comprises more than two racks, the racks are arranged on the slotted holes and are matched with the slotted holes; the rack is provided with internal corrugations at the inner side of the slotted hole; the two racks are symmetrically arranged on the slotted holes of the sleeve or the plurality of racks are uniformly arranged on the slotted holes of the sleeve, when the screw is screwed in from the screw screwing end of the expansion assembly, namely the first hole, the screw is contacted with the internal tooth trace of the expansion moving part, and the internal tooth trace is extruded along with the screw screwing in to expand the racks towards the direction far away from the central line of the sleeve;

when the expansion moving part comprises a rack and a connecting part for connecting the rack, the connecting part is connected with the top end of the rack, a second hole is formed in the connecting part, the connecting part is arranged at the top of the sleeve, a second hole corresponding to the first hole is formed in the connecting part, and the rack is arranged at the position of the slotted hole; the rack is provided with internal corrugations at the inner side of the slotted hole; when the screw is screwed in from the second hole and the first hole, the screw is in contact with the internal thread, and the internal thread is extruded along with the screwing of the screw, so that the rack expands towards the direction away from the central line of the sleeve.

Further, the racks are multiple, and the racks are uniformly distributed on the edge of the connecting piece.

Further, the internal tooth pattern includes a plurality of teeth, and each of the teeth is not equal in height or the internal tooth pattern is provided with internal tooth grooves which are not equal in height.

Further, when the screw is screwed into the expansion assembly, when the screw is screwed into the position where the rack is arranged in the slotted hole, the external expansion forces of different positions of the rack are unequal through the internal tooth patterns or the internal tooth grooves which are arranged on the inner side of the rack and are unequal.

Further, the rack is provided with one or more buckles; when the rack is connected with the connecting piece in a jogged manner, one end of the rack, which is far away from the connecting piece, is provided with a buckle or a plurality of buckles, when the rack is an independent strip, one end or two ends of the rack are provided with one or a plurality of buckles, the sleeve is provided with a buckle hole which is matched with the buckle, when the expansion moving piece is arranged on the sleeve, the buckle is arranged in the buckle hole, and the buckle is used for preventing the expansion moving piece from falling off.

Further, the sleeve is a nylon non-expansion sleeve or a nylon expansion sleeve, the connecting piece is a metal connecting piece, and the rack is a metal rack.

Further, external threads are arranged on the outer wall of the sleeve or/and the outer side of the rack, the external threads are arranged on the outer side of the rack and are first external threads, and second external threads are arranged on the outer wall of the sleeve and are used for improving the overall drawing resistance of the heat insulation nail; the external patterns are external patterns or coarse patterns.

Further, the device also comprises a screw which is screwed into the expansion assembly to expand the expansion moving part or to expand one end of the sleeve away from the screwed-in end together with the expansion moving part.

Further, the connecting piece is provided with an internal thread, and the internal thread is arranged on the second hole for the screw to pass through;

or/and, the expansion moving part is provided with a fixed internal thread and a movable internal thread, and the screw thread passes through or penetrates into the internal thread and the internal thread to form an anti-drawing whole;

or/and, the sleeve is provided with internal threads which are generated or preset by screw self-tapping, and the internal threads are used in combination with internal threads arranged on the rack or internal threads arranged on the connecting piece and internal threads arranged on the rack, and a tensile whole is generated through the engagement connection effect of screw screwing.

Further, the novel plastic bottle further comprises a disc, wherein the disc is arranged at the screw-in end of the orifice of the first hole, and the disc is a metal disc or a nylon disc.

Compared with the prior art, in the technical scheme, the expansion moving part is detachably arranged on the sleeve, and the heat preservation nail provided with the expansion assembly improves the stability of an expansion nail fixing object through the rack, the screw and the two expansion modes of the sleeve and the screw.

The beneficial effects are that: in the traditional heat preservation nail or expansion nail, the expansion part is composed of metal or nylon, the expansion part is formed by expanding a metal moving part or/and nylon, the self-tapping screw is screwed into the nylon sleeve through the internal thread of the connecting piece and the nylon characteristic of the sleeve, then the internal thread or/and nylon are screwed into the connecting piece to set the expansion part, and further, the screw thread is tightly meshed with the internal thread of the connecting piece, the sleeve and the internal thread of the sleeve, and the internal thread of the sleeve can be formed by screw self-tapping or preset; therefore, the heat preservation nail with the expansion assembly has the nylon expansion property and the metal expansion function, and achieves a better pulling-out resistance.

Drawings

FIG. 1 is an assembled view of the sleeve, screw and expansion actuator;

FIG. 2 is a block diagram of the sleeve, screw and expansion member;

FIG. 3 is a view showing the construction of the disc;

FIG. 4 is a block diagram of the expansion actuator;

fig. 5 is a view showing the construction of the bushing.

Reference numerals illustrate:

1. a sleeve; 2. an expansion moving member; 3. a disc; 4. a screw;

11. a first hole; 12. a slot hole; 13. a second external vein; 21. a rack; 22. a connecting piece; 23. internal corrugations; 24. a first external vein; 25. a buckle;

221. a second hole; 231. teeth.

Detailed Description

In order to describe the technical content, constructional features, achieved objects and effects of the technical solution in detail, the following description is made in connection with the specific embodiments in conjunction with the accompanying drawings.

Referring to fig. 1 to 5, the present utility model provides a heat insulation nail provided with an expansion assembly, which can be used as an expansion nail or a heat insulation nail, wherein the expansion assembly comprises a sleeve 1 and an expansion moving member 2; the sleeve 1 is connected with the expansion moving part 2 in a combined way (detachable way) or in a jogged way (non-detachable way), a first hole 11 is formed in the middle of the sleeve 1, the hole opening of the first hole 11 is a screw-in end, a slotted hole 12 is formed in the outer wall of the sleeve 1, the slotted hole 12 is communicated with the first hole 11, and the screw-in end and the first hole of the sleeve are used for screwing in a screw. The expansion member 2 includes two or more racks 21, or: the expansion member 2 includes a rack 21 and a connecting member 22 connecting the rack. When the expansion moving member 2 includes more than two racks 21, the racks 21 are disposed on the slot 12 and adapted to the slot 12, which may be a clamping fit. The rack 21 is provided with internal corrugations 23 inside the slot 12; the two racks 21 are symmetrically arranged on the slot holes 12 of the sleeve 1 or the two racks 21 are uniformly arranged on the slot holes 12 of the sleeve, and each slot hole 12 corresponds to one rack 21. When a screw is screwed in from the screw-in end of the expansion assembly and the first hole 11, the screw contacts with the internal thread 23 of the expansion moving member 2, and the internal thread 23 is pressed along with the screw-in, so that the rack 21 expands in a direction away from the center line of the sleeve.

When the expansion moving member 2 comprises a rack and a connecting member 22 for connecting the rack, the connecting member 22 is connected with the top end of the rack 21, a second hole 221 is formed in the connecting member 22, the connecting member 22 is disposed at the top of the sleeve 1, a second hole 221 corresponding to the first hole 11 is formed in the connecting member 22, and the rack 21 is disposed at the position of the slot hole 12; the rack 21 is provided with internal corrugations 23 inside the slot 12; when the screw is screwed in from the second hole 221 and the first hole 11, the screw contacts with the internal spline 23, and the internal spline 23 is pressed with the screw screwing in, so that the rack 21 expands in a direction away from the center line of the sleeve 1.

It should be noted that, the aperture of the first hole 11 is smaller than or equal to or greater than the aperture of the second hole 221, threads may be disposed on the inner walls of the first hole 11 and the second hole 221, and the threads on the first hole 11 and the second hole 221 may be used for screwing in the screw 4; of course, in some embodiments, the aperture of the first hole 11 will be smaller than the diameter of the screw 4; in some embodiments, the first hole 11 may be a blind hole or a through hole, and the second hole 221 may be a through hole.

It should be noted that, the connecting piece 22 is disposed on the top of the sleeve 1, the shape of the connecting piece 22 may be the same as the shape of the top of the sleeve 1, and the connecting piece 22 is preferably cylindrical; the rack 21 is placed on the edge of the connecting piece 22, that is, when the expansion moving piece 2 is assembled into the sleeve 1, the rack 21 is placed in the slot 12 of the outer wall of the sleeve 1, and the rack 21 moves along the slot 12, and the slot 12 also plays a role in limiting and fixing. It should also be noted that, preferably, the internal thread 23 is disposed at an end far from the connecting piece 22, the internal thread 23 is disposed toward the central axis of the second hole 221, and the tooth end of the internal thread 23 has a gap from the central axis. Of course, the distance from the end of the internal spline 23 to the central axis may be greater than or equal to the distance from the inner wall of the first hole 11 to the central axis. It should be noted that, since the expansion moving member 2 is detachably disposed on the sleeve 1, the user may change the expansion moving member 2 in the through hole actual use environment, that is, when the wall body is too soft, the expansion moving member 2 with a larger opening angle of the rack 21 may be changed, and when the wall body is hard, the expansion moving member 2 with a smaller opening angle of the rack 21 may be changed. In some embodiments, the wall thickness of the rack 21 may be smaller than the wall thickness of the sleeve 1.

It should be further noted that when the internal thread 23 is pressed by the screw 4, the rack 21 will be opened outwards, and the opened rack 21 will be embedded into the wall body, so as to fix the expansion nail by expansion; specifically, when the screw 4 passes through the second hole 221 and the first hole 11 in sequence, since the diameter of the screw 4 is larger than that of the first hole 11, the sleeve 1 is self-tapped by the screw 4, and after the screw 4 is continuously screwed into engagement and extrusion contact with the internal tooth pattern 23, the rack 21 is outwardly opened. In the above technical scheme, the expansion moving part 2 is detachably arranged on the sleeve 1, and the heat insulation nail provided with the expansion assembly is used for improving the stability of the expansion nail fixing object through the two expansion modes of the rack 21 and the screw 4 and the sleeve 1 and the screw 4, and improving the convenience of operation of the heat insulation nail provided with the expansion assembly.

Referring to fig. 2 and 5, in some embodiments, a first positioning point is disposed on a surface of the connecting member 22 opposite to the sleeve 1, a second positioning point is disposed on a surface of the sleeve 1 opposite to the connecting member 22, and the first positioning point and the second positioning point are adapted to prevent the connecting member 22 from falling off the sleeve 1. It should be noted that, when the first positioning point is a positioning block, the second positioning point is a positioning slot 12; conversely, when the first positioning point is the positioning slot 12, the second positioning point is the positioning block. Of course, in another embodiment, the first positioning point and the second positioning point are mutually matched buckles. The provision of the first and second positioning points will further prevent the expansion member 2 from falling off the casing 1.

In some embodiments, the sleeve 1 is a nylon non-expansion sleeve or a nylon expansion sleeve, the connecting piece 22 is a metal connecting piece 22, the rack 21 is a metal rack 21, and of course, in another embodiment, the sleeve 1 may be a metal sleeve 1.

Referring to fig. 3, in some embodiments, the heat insulation nail provided with the expansion assembly further comprises a disc 3, so as to fix the heat insulation board. The disc 3 is arranged on the side of the connecting piece 22 away from the sleeve 1, and the disc 3 is a nylon disc 3 or a metal disc 3. It should be noted that, the disc 3 is a fixed disc 3, and the fixed disc 3 increases the contact area between the head of the screw 4 and the wall or the object to be fixed, so as to prevent the head of the screw 4 from sinking into the wall or the object to be fixed; meanwhile, the contact surface between the screw 4 head and the wall body or the fixed object is increased, so that the screw 4 head is prevented from penetrating through the surface of the object to be fixed in the moving process. The disc 3 may be of unitary construction with the expansion member 2 or of a separate construction.

Referring to fig. 2, in some embodiments, the racks 21 are a plurality of racks 21, the racks 21 are uniformly distributed on the edge of the connecting piece 22, and the distances between two adjacent racks 21 may be equal or unequal. It should be noted that, the number of the racks 21 is preferably two, and the two racks 21 are disposed opposite to each other, that is, the internal grooves 23 on the inner side of the racks 21 are also disposed opposite to each other; in actual use, the screw 4 sequentially passes through the second through hole and the first through hole, when the screw 4 is continuously screwed in, the screw 4 extrudes the internal tooth patterns 23 towards two sides, the internal tooth patterns 23 are extruded, and the rack 21 is driven to prop open at two opposite sides, so that the thermal insulation nail with the expansion assembly is fixed.

Referring to fig. 5, in some embodiments, the middle portion of the slot 12 is in conductive connection with the first hole 11. The slot hole 12 is located on the outer wall of the sleeve 1, and the upper portion of the slot hole 12 is not in communication with the first hole 11, so as to prevent the expansion moving member 2 from falling off; and the conducting part is used for accommodating the insections. In use, when the expansion member 2 is inserted into the sleeve 1, the rack 21 at the edge needs to be firstly expanded, then the expanded rack 21 is put into the adapted slot hole 12, and the connecting member 22 is placed on the top of the sleeve 1 to complete the assembly. Of course, the slot 12 and the first hole 11 may also be in communication from the top of the sleeve 1, that is, the first hole 11 and the slot 12 may be in communication from the opening of the first hole 11 to the middle of the first hole 11, and at this time, the side of the rack 21 close to the first hole 11 will be the internal tooth pattern 23.

In some embodiments, in order to increase the pull-out resistance of the expansion element 2, a first external thread 24 is further provided on the side of the rack 21 facing away from the first hole 11, and the first external thread 24 is used to increase the pull-out resistance of the sleeve 1. It should be noted that, when the rack 21 is opened outwards, the rack 21 is embedded into the wall body, and meanwhile, the first external thread 24 on the outer wall of the rack 21 is also embedded into the cavity body, and the first external thread 24 will increase the friction force between the expansion moving part 2 and the wall body, so as to increase the tensile pulling force of the heat insulation nail with expansion assembly. Of course, in some embodiments, the outer wall of the sleeve 1 is further provided with a second external thread 13, where the second external thread 13 is used to improve the pulling resistance of the sleeve 1, and the external thread is an external thread or a coarse thread, that is, the pulling resistance can be improved. The second external thread 13 is disposed on the outer wall of the sleeve 1, and the first external thread 24 and the second external thread 13 are both used for improving the pull-out resistance of the expansion nail.

Referring to fig. 3 and 4, in the present embodiment, the internal spline 23 includes a plurality of teeth 231, and each of the teeth 231 has an unequal width, and each of the teeth 231 has an unequal height or an unequal height of an internal spline provided therein; of course, in some embodiments, the width and height of each of the teeth 231 are the same. When the screw is screwed into the expansion assembly, when the screw is screwed into the position where the rack is arranged in the slotted hole, the external expansion forces of different positions of the rack are unequal through the internal tooth patterns or the internal tooth grooves which are arranged on the inner side of the rack and are unequal in height. The width of the tooth 231 refers to the width of the bottom of the tooth 231, that is, the width of the connection between the tooth 231 and the rack 21; the height of the teeth 231 refers to the distance from the inner wall of the rack 21 to the tip of the teeth 231, i.e., the distance from the inner wall of the rack 21 to the end of the teeth 231 remote from the rack 21. Since the heights of the teeth 231 are not uniform, the distance of outward expansion of the rack 21 is also different when the screw 4 presses different teeth 231, i.e., when the teeth 231 having a higher height are pressed, the distance of outward expansion of the rack 21 at the position where the teeth 231 are located will be larger; similarly, when the tooth 231 having a lower height is pressed, the distance by which the rack 21 expands outwardly at the position where the tooth 231 is located will be smaller. When the screw is screwed in, the internal thread is changed from low to high, and the internal thread and the screw are combined to generate a countersunk head effect with small inside and large outside, so that the expansion clamping effect is achieved; the internal tooth groove is from deep to shallow, when the screw is screwed in, the internal tooth groove is from deep to shallow, and the internal tooth groove and the screw are combined to generate a countersunk head effect with small inside and large outside, so that the expansion clamping effect is achieved.

It should be further noted that, in actual use, the rack 21 is limited by the hole in the wall, and the internal spline 23 at the upper end is not in pressing contact with the screw 4 after the internal spline 23 at the lower end is spread by the screw 4; specifically, when the internal thread 23 at the upper end is supported by the screw 4, the entire rack 21 will be opened outwards, but due to the blocking of the wall hole, the rack 21 not pressed by the screw 4 will be blocked by the wall, waiting for the screw 4 to be screwed in.

In some embodiments, in order to prevent the expansion member 2 from falling off, the rack 21 is provided with one or more catches 25; when the rack 21 is connected with the connecting piece 22 in a jogged manner, one end of the rack away from the connecting piece 22 is provided with one buckle or a plurality of buckles 25, and when the rack is an independent strip (when the expansion moving piece only comprises more than two racks but not comprises the connecting piece), one end or two ends of the rack 21 is provided with one or a plurality of buckles, and the sleeve is provided with buckle holes matched with the buckles. When the expansion moving member 2 is inserted into the sleeve 1, the buckle 25 is placed in the buckle hole, and the buckle 25 is used for preventing the expansion moving member 2 from falling off. It should be noted that, the buckle 25 is disposed at one end of the rack 21 away from the connecting piece 22, and the sleeve 1 is provided with a buckle hole, where the buckle hole is used for being clamped with the buckle 25, and the buckle hole is matched with the buckle 25.

In some embodiments, the utility model also includes a screw (which may be a self-tapping screw) that is threaded into the expansion assembly to expand the expansion member or to expand a head of the sleeve away from the threaded end of the screw with the expansion member.

In some embodiments, the connecting member 22 is provided with internal threads, which are provided in the second hole for the screw to pass through. The drawing force of the screw can be improved through the internal thread, and the screw is prevented from being pulled out. Or/and, the expansion moving part is provided with fixed internal threads and movable internal threads, and the screw threads penetrate through or penetrate into the internal threads arranged on the connecting part 22 and the internal threads arranged on the rack, so that the expansion moving part forms an anti-drawing whole. Or/and, the sleeve 1 is provided with internal threads which are generated or preset by screw self-tapping, and the internal threads arranged on the racks or the internal threads arranged on the connecting piece 22 and the internal threads arranged on the racks are combined to be used, so that a tensile whole is generated by the engagement connection effect of the internal threads of the sleeve and the internal threads of the racks or the internal threads of the sleeve and the internal threads of the connecting piece and the internal threads of the racks through screw screwing. In the embodiment with threads, the threads of the connecting piece, the expansion moving piece and the sleeve can realize the integral mutual engagement of the heat preservation nail, so that the integral pulling-out resistance is achieved, and the pulling-out resistance is improved.

It should be noted that the sleeve may be an expansion sleeve including an expansion end disposed distally from the screw-in end.

It should be noted that the expansion moving member is very complicated, but can be formed by casting, die casting or stamping, that is, the rack and the connecting member are integrated, and the manufacturing cost is greatly reduced by die casting and die casting. Compared with the traditional nylon expansion nail, the utility model increases the metal expansion combination, directly improves the tensile pulling force of the utility model, and the expansion moving part is selected according to the most cost-saving manufacturing process and can realize the functional elements of the utility model.

It should be noted that, although the foregoing embodiments have been described herein, the scope of the present utility model is not limited thereby. Therefore, based on the innovative concepts of the present utility model, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solution, directly or indirectly, to other relevant technical fields, all of which are included in the scope of the utility model.

Claims

1. The heat preservation nail is characterized in that the expansion assembly consists of a sleeve and an expansion moving part; the sleeve is connected with the expansion moving part in a combined or embedded way, a first hole is formed in the middle of the sleeve, the hole opening of the first hole is a screw screwing end, a slotted hole is formed in the outer wall of the sleeve, and the screw screwing end and the first hole of the sleeve are used for screwing in a screw;

2. The heat preservation nail provided with the expansion assembly according to claim 1, wherein the racks are a plurality of, and the racks are uniformly distributed on the edge of the connecting piece.

3. A heat retaining pin provided with an expansion assembly according to claim 1, wherein the internal toothing comprises a plurality of teeth, and the height of each of the teeth is not equal or the height of the internal toothing provided with the internal toothing is not equal.

4. A heat insulating nail provided with an expansion assembly according to claim 1 or 3, wherein when the screw is screwed into the expansion assembly, when the screw is screwed into the portion of the slotted hole provided with the rack, the external expansion forces of different portions of the rack are unequal through the internal grooves or the internal grooves which are arranged on the inner side of the rack.

5. A heat preservation nail provided with an expansion assembly according to claim 1, wherein the rack is provided with one or more buckles; when the rack is connected with the connecting piece in a jogged manner, one end of the rack, which is far away from the connecting piece, is provided with a buckle or a plurality of buckles, when the rack is an independent strip, one end or two ends of the rack are provided with one or a plurality of buckles, the sleeve is provided with a buckle hole which is matched with the buckle, when the expansion moving piece is arranged on the sleeve, the buckle is arranged in the buckle hole, and the buckle is used for preventing the expansion moving piece from falling off.

6. The heat preservation nail provided with an expansion assembly according to claim 1, wherein the sleeve is a nylon non-expansion sleeve or a nylon expansion sleeve, the connecting piece is a metal connecting piece, and the rack is a metal rack.

7. The heat preservation nail provided with the expansion assembly according to claim 1, wherein the outer wall of the sleeve or/and the outer side of the rack is provided with external threads, the external side of the rack is provided with first external threads, the external side of the sleeve is provided with second external threads, and the first external threads and the second external threads are used for improving the integral drawing resistance of the heat preservation nail; the external patterns are external patterns or coarse patterns.

8. A heat retaining screw provided with an expansion assembly according to claim 1, further comprising a screw which is screwed into the expansion assembly to expand the expansion member or to expand a head of the sleeve remote from the screwed-in end together with the expansion member.

9. The heat preservation nail provided with an expansion assembly according to claim 1, wherein the connecting piece is provided with internal threads, and the internal threads are arranged on the second hole for the screw to pass through;

10. The heat preservation nail with expansion assembly according to claim 1, further comprising a disc disposed at a screw-in end of the first hole opening, wherein the disc is a metal disc or a nylon disc.