CN211729043U

CN211729043U - Split type staggered nested transmission nail shooter

Info

Publication number: CN211729043U
Application number: CN202020002626.7U
Authority: CN
Inventors: 孙衍鹏; 孙明华; 叶生滨
Original assignee: Sichuan Lianchang Railway Engineering Co ltd
Current assignee: Sichuan Lianchang ICT Technology Co., Ltd
Priority date: 2020-01-02
Filing date: 2020-01-02
Publication date: 2020-10-23
Anticipated expiration: 2030-01-02

Abstract

The utility model relates to the technical field of mechanical direct anchoring, in particular to a split type staggered nested transmission nail shooter, which is cylindrical as a whole and comprises a firing component, a nail shooting component and a split type positioning component, wherein the positioning component is used for fixing nails at the position of a surface to be pushed; the nail shooting assembly and the positioning assembly are coaxially nested in a staggered manner and are used for pushing nails fixed by the positioning assembly into a surface to be pushed; the firing assembly is slidably sleeved outside the nail shooting assembly and the positioning assembly, and cavities are formed among the firing assembly, the nail shooting assembly and the positioning assembly; the firing assembly comprises a sleeve, and a cylinder cover covered at the tail part of the sleeve. The nail shooter is small in structure, simple to manufacture, convenient to use, suitable for installation of clamps in various narrow and small spaces such as cable ducts and the like and high in practicability.

Description

Split type staggered nested transmission nail shooter

Technical Field

The utility model relates to a mechanical direct anchor technical field, concretely relates to nested transmission ail shooter of split type staggered floor.

Background

The nail shooter is a tool for driving a shooting nail into a building body by using gunpowder gas generated by launching a blank cartridge as power. The length of an axial nail shooter on the market at present generally exceeds 300mm, the nail shooter cannot be unfolded under the influence of overlong size factors of the nail shooter in a narrow space (such as a small-size channel, a ceiling sunken area, an existing narrow space of a bearing structure and the like), so that the cable support in a cable trench can be fixed only by manual knocking, the laying speed of the cable support in the cable trench is greatly reduced, the efficiency is reduced, and the labor cost is increased. Therefore, it is very important and urgent to develop a short axial nail shooter.

However, axial nailers typically consist of a housing, a cartridge extension chamber, an ejection mechanism, and a handle. The conventional axial nail shooter springs are distributed horizontally on the striking pin shaft, and the spring length cannot be shortened because of the limitation of the minimum excitation stroke and the ejection stroke, and the distribution of the springs directly causes the nail shooter to present a slender characteristic. The handle of the traditional axial nail shooter is longer, and the handle structure has no other functions except for human-machine consideration in the operation; the telescopic space of the traditional axial nail shooter bullet filling telescopic cavity comprises a nail shooting bullet rubber shell and a nail shooting length; when the firing pin of the traditional axial nail shooter is pre-pressed, the rear end of the shell of the nail shooter is provided with a space for avoiding the pre-pressed state of the firing pin. The traditional axial nail shooter firing pin is reset by a reset spring, and the length and the elasticity of the reset spring have strict requirements. Therefore, the traditional axial nailing device structure cannot be directly shortened, and cannot be directly used for laying a cable support in a narrow space. In view of the above, the inventor has developed an ultrashort axial nail shooter which thoroughly changes the structures of the shell, the firing pin and the nail shooting cartridge cavity shell on the premise of meeting the safe use of the shooting nail.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a split type nested transmission ail shooter of staggered floor, this ail shooter structure is small and exquisite, simple manufacture, and convenient to use is applicable to the fixture installation like various narrow and small spaces such as cable pit, and the practicality is strong.

In order to achieve the above object, the utility model adopts the following technical scheme:

a split type staggered nested transmission nail shooter is cylindrical as a whole and comprises a firing assembly, a nail shooting assembly and a positioning assembly, wherein the positioning assembly is used for fixing nails to a surface to be pushed in; the nail shooting assembly and the positioning assembly are coaxially arranged and are used for pushing the nail fixed by the positioning assembly into a surface to be pushed; the firing assembly is slidably sleeved outside the nail shooting assembly and the positioning assembly, and cavities are formed among the firing assembly, the nail shooting assembly and the positioning assembly; the firing assembly comprises a sleeve, and a cylinder cover covered at the tail part of the sleeve.

In detail, the nail shooting assembly comprises a needle seat and a needle, as well as a needle seat sleeve and a needle shooting sleeve, which are sequentially connected, wherein the needle seat is slidably connected in the needle seat sleeve to drive the needle to reciprocate in the needle shooting sleeve, and a firing spring is arranged on the outer side of the needle shooting seat; the needle stand sleeve is connected in the firing assembly in a sliding mode, and a reset spring is arranged on the outer side of the needle stand sleeve.

In detail, the one end that meets with the striker on the striker seat is equipped with the mounting panel that the external diameter matches with the needle file cover internal diameter, percussion spring one end is fixed on the cover, and the other end is fixed in the mounting panel side to compress the percussion spring when the percussion subassembly moves towards the face of waiting to push in.

In detail, the needle seat sleeve is externally provided with a first installation limiting ring with the outer diameter matched with the inner diameter of the sleeve, one end of the reset spring is fixed on the sleeve cover, the other end of the reset spring is fixed on the side surface of the first installation limiting ring, and the reset spring is compressed when the firing assembly moves towards the surface to be pushed.

More specifically, the firing assembly further comprises a limiting sleeve, the limiting sleeve is arranged on the inner side of the barrel cover, a gap is formed between the limiting sleeve and the barrel cover, a reset cavity is formed among the inner wall of the barrel cover, the outer wall of the limiting sleeve, the outer side of the needle seat sleeve and the first installation limiting ring, and the reset spring is located in the reset cavity.

Furthermore, the nail shooting assembly also comprises a mounting hole arranged in the mounting plate, a firing pin sleeved in the mounting hole in a sliding manner, and a strip-shaped pin groove arranged on the needle seat sleeve and matched with the firing pin; the trigger pin is clamped at one end of the strip-shaped pin groove, and when the limiting sleeve moves towards the first mounting limiting ring, the trigger pin can be pushed down to be capable of moving in the strip-shaped pin groove.

Furthermore, the positioning assembly comprises a positioning seat, one end of the positioning seat is provided with an installation groove matched with the needle seat sleeve, and the bottom of the installation groove is provided with an installation through hole for installing the nail shooting bullet; the outer part of the firing pin sleeve is matched with the mounting through hole and can reciprocate in the mounting through hole, the end face of the firing pin sleeve is provided with a limiting hole through which the tip end of the firing pin passes, and the tip end of the firing pin penetrates through the limiting hole to pierce a nail shooting bullet.

Furthermore, a second installation limiting ring is arranged on the positioning seat, the outer diameter of the second installation limiting ring is matched with that of the sleeve to limit the movement of the positioning seat out of the sleeve, and a shell withdrawing cavity is formed among the second installation limiting ring, the outer wall of the positioning seat, the inner wall of the sleeve, the first installation limiting ring and the outer wall of the needle seat sleeve; an ejection spring is arranged in the ejection cavity, one end of the ejection spring is fixed on the second mounting limiting ring, and the other end of the ejection spring is fixed on the first mounting limiting ring.

Furthermore, the positioning assembly further comprises a positioning ring, a positioning groove matched with the positioning ring is formed in one end, opposite to the surface to be pushed, of the positioning seat, and the positioning ring is clamped in the positioning groove; the middle part of the positioning ring is provided with a through hole, and the inner diameter of the through hole is larger than the outer diameter of the nail and smaller than the outer diameter of the firing pin sleeve so as to ensure that the firing pin sleeve can push the positioning ring out of the positioning groove.

As a preferred scheme, the tail end of the striker base is provided with an internal threaded hole, and a T-shaped bolt is connected with the internal thread of the internal threaded hole.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model aims at providing a nested transmission ail shooter of split type staggered floor, maximum length is 165mm under its user state, compare in present conventional ail shooter (300 mm), under the condition that does not influence its normal function, through brand-new split type and nested structural design of staggered floor, its length has been shortened greatly, make it can be if the tunnel, carry out fixture fixed mounting in this kind of narrow and small space of cable pit along the railway, this blank has been filled, can accelerate the fixture of narrow and small space department greatly and lay efficiency, and can also reduce installation cost, human cost.

Drawings

FIG. 1 is an exploded view of the present invention;

FIG. 2 is a schematic view of the overall structure of the utility model except the percussion assembly;

FIG. 3 is a schematic view of the open state of the present invention;

fig. 4 is a schematic X-axis cross-sectional view of the present invention in an open state;

FIG. 5 is a schematic view of the Y-axis cross section of the open state of the present invention

FIG. 6 is a schematic view of the pre-pressing state of the present invention;

fig. 7 is a schematic view of the X-axis cross section in the pre-pressing state of the present invention;

fig. 8 is a schematic view of the Y-axis cross section in the pre-pressing state of the present invention;

fig. 9 is a schematic diagram of the excited state of the present invention;

fig. 10 is a schematic X-axis cross-sectional view of the excited state of the present invention;

fig. 11 is a schematic cross-sectional view of the utility model in the Y-axis direction in the excited state;

fig. 12 is a schematic view of the shell removing state of the present invention;

fig. 13 is a schematic X-axis cross-sectional view of the shell-removed state of the present invention;

fig. 14 is a schematic view of the Y-axis cross section in the shell-removed state of the present invention.

Wherein, the names corresponding to the reference numbers are:

1-sleeve, 11-sleeve cover, 12-reset spring, 13-stop collar, 14-reset cavity, 2-firing pin seat, 21-firing pin, 22-needle seat sleeve, 23-firing pin sleeve, 24-firing spring, 25-first mounting stop collar, 26-mounting plate, 27-firing pin, 28-strip pin groove, 29-T bolt, 3-positioning seat, 31-mounting groove, 32-mounting through hole, 33-second mounting stop collar, 34-shell withdrawing cavity, 35-shell withdrawing spring, 36-positioning ring, 37-positioning groove and 38-through hole.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.

The purpose of this embodiment is in order to provide a split type staggered floor nested transmission ail shooter, is particularly useful for the cable frame laying in the cable pit along tunnel, railway. The existing nailing device is usually about 300mm in length, the specification of a cable trench for laying cables is certain (a single layer is generally 400mm wide and 600mm deep, and the cable trench for laying the cables along the tunnel and the railway is also 300mm wide and 300mm deep), and the laying of a cable rack in the cable trench is very difficult by adopting the existing nailing device. Although it is currently theorized that the shortest length that can be achieved by the nailer can be reduced to 185mm, this is not really achieved and, even with a 185mm nailer, it is quite inconvenient to use for rack laying operations in a 300mm wide cable trench. This unit product mainly is the cable frame who uses in the cable pit along the tunnel, railway, in order to solve above-mentioned problem, the installation of the cable frame of being convenient for promotes the installation effectiveness, increases economic benefits, and special research and development has designed a nested transmission ail shooter of split type staggered floor, and it is when realizing this function of cable frame laying installation, and the biggest total length is only 165mm, still can adapt to the cable frame laying installation in the less small-size cable pit.

The 165mm short axial nail shooter structure is mainly characterized in that: firstly, changing the horizontal spatial arrangement of the springs into an outward radiation staggered nested arrangement; secondly, the handle is cancelled, and the shell replaces the handle; thirdly, a front shell for installing the nail shooting bullet is changed into a split structure, and the shell withdrawing stroke is reduced to the length of the rubber shell; fourthly, a striker avoiding hole is reserved on the rear shell of the nail shooter, and when the striker is in a prepressing state, the tail of the striker penetrates out of the avoiding hole. Fifth, the structure that the extension shell can reset the firing pin is attached, so that the mechanical reset is more stable.

Specifically, referring to fig. 1 to 14, the nail shooter of the present embodiment has a cylindrical shape as a whole, and mainly includes a firing assembly, a nail shooting assembly and a positioning assembly.

One, about the firing subassembly

The firing assembly is slidably sleeved outside the nail shooting assembly and the positioning assembly, and cavities are formed among the firing assembly, the nail shooting assembly and the positioning assembly; the firing assembly comprises a sleeve 1, a sleeve cover 11 and a limiting sleeve 13, the tail end of the sleeve is completely opened and is covered by the sleeve cover 11 through threads, a hole is formed in the middle of the other end of the sleeve to be sleeved with the positioning assembly in a sliding mode, the limiting sleeve is cylindrical, the outer diameter of the limiting sleeve is smaller than the inner diameter of the sleeve, an outward turning edge which is bent by 90 degrees outwards is arranged at the tail end of the limiting sleeve, and the limiting sleeve is fixed with the sleeve cover through the outward turning edge. During installation, the limiting sleeve is fixed on the barrel cover 11, then the barrel cover 11 is covered on the tail end of the sleeve 1 in a spiral mode, and after installation is completed, the limiting sleeve is turned outwards to abut against the inner wall of the sleeve along the end face, so that a gap is formed between the outer wall of the limiting sleeve and the inner wall of the barrel.

Second, about penetrating the nail assembly

The nail shooting assembly and the positioning assembly are coaxially arranged and are used for pushing the nail fixed by the positioning assembly into a surface to be pushed. Specifically, the shooting nail assembly comprises a striker base 2 and a striker 21 which are integrally formed, and a striker sleeve 22 and a striker sleeve 23 which are integrally formed.

In detail, the tail end of the striker base 2 is provided with an internal threaded hole, the internal threaded hole is internally connected with a T-shaped bolt 29, and the barrel cover 11 is provided with a through hole matched with the T-shaped bolt 29 and the end part of the striker base 2, so as to ensure that the firing assembly can integrally move relative to the nail-shooting assembly, and the T-shaped bolt 29 can facilitate manual prepressing operation. The other end of the striker base 2 is a convex ring-shaped structure, for convenience of description, the convex part of the striker base is integrally marked as a mounting plate 26, the outer diameter of the mounting plate is matched with the inner diameter of the striker base sleeve 22, and the striker base 2 is slidably connected in the striker base sleeve 22 through the mounting plate 26 to drive the striker 21 to reciprocate in the striker sleeve 23. In order to realize that the striker base 2 and the striker base sleeve 22 can synchronously move in the opening state and the prepressing state, the mounting plate 26 is further provided with a mounting hole in the embodiment, a firing pin 27 is sleeved in the mounting hole in a sliding manner, and the bottom of the firing pin is arranged at the bottom in the mounting hole through a spring; meanwhile, a strip-shaped pin slot 28 matched with the firing pin is arranged on the needle seat sleeve 22; the trigger pin 27 is clamped at one end of the bar-shaped pin slot 28, when the limiting sleeve 13 moves towards the surface to be pushed in, the trigger pin 27 can be pushed down to be moved in the bar-shaped pin slot, and the specific structure of the trigger pin and the bar-shaped pin slot, and the operating principle and mode of mutual matching are all mature schemes in the prior art which are directly adopted, and are not repeated herein. A first installation limiting ring 25 with the outer diameter matched with the inner diameter of the sleeve 1 is arranged outside the needle seat sleeve 22, and the needle seat sleeve 22 is connected in the firing assembly in a sliding mode through the first installation limiting ring 25.

The outside of the needle striking seat is provided with a firing spring 24, and the outside of the needle seat sleeve is provided with a return spring 12. More specifically, a reset cavity 14 is formed among the inner wall of the sleeve, the outer wall of the limiting sleeve, the outer side of the needle seat sleeve 22 and the first installation limiting ring, the reset spring 12 is located in the reset cavity 14, one end of the reset spring is fixed to the outward turning edge of the limiting sleeve, the other end of the reset spring is fixed to the side face of the first installation limiting ring, and the reset spring can be compressed when the firing assembly moves towards the surface to be pushed in. Meanwhile, a firing cavity is formed among the inner wall of the cylinder cover 11, the outer wall of the firing pin seat 2, the inner wall of the pin seat sleeve 22 and the inner wall of the limiting sleeve, the firing spring 24 is located in the firing cavity, one end of the firing spring is fixed on the cylinder cover 11, the other end of the firing spring is fixed on the side face of the mounting plate 26, and the firing spring is compressed when the firing assembly moves towards the surface to be pushed.

Preferably, the cover 11 of the present embodiment is further provided with a step-shaped groove body matching with the T-shaped bolt 29, and when in the open state, the outer surface of the T-shaped bolt 29 is flush with the outer surface of the cover 11. After the nail shooter finishes the fixing operation of shooting nails, even if the firing pin 27 is not reset to the round clamping position where the strip-shaped pin groove 28 is clamped at one end of the firing pin, the sleeve 1 can be moved to realize manual reset after the T-shaped bolt 29 is manually abutted.

Third, about the locating component

The locating component is used for fixing the nail to the position of a face to be pushed in, is of a split structure and specifically comprises a locating seat 3 and a locating ring 36. The tail end of the positioning seat 3 is provided with an installation groove 31 matched with the needle seat sleeve 22, the other end of the positioning seat is provided with a positioning groove 37 matched with the positioning ring 36, and an installation through hole 32 used for installing a nail shooting ball is arranged between the installation groove 31 and the positioning groove 37. The outer part of the firing pin sleeve 23 is matched with the mounting through hole 32 and can reciprocate in the mounting through hole, a limiting hole through which the tip end of the firing pin passes is arranged on the end surface of the firing pin sleeve 23, and the tip end of the firing pin penetrates through the limiting hole to pierce a nail shooting bullet.

Wherein, the tail end of the positioning seat 3 is located in the sleeve 1, the other end extends out of the sleeve, a second installation limiting ring 33 is arranged outside the positioning seat 3 located in the sleeve 1, and the outer diameter of the second installation limiting ring is matched with that of the sleeve 1 so as to realize the sliding connection between the positioning seat 3 and the sleeve 1. A shell withdrawing cavity 34 is formed among the second installation limiting ring, the outer wall of the positioning seat 3, the inner wall of the sleeve, the first installation limiting ring 25 and the outer wall of the needle seat sleeve 22, a shell withdrawing spring 35 is arranged in the shell withdrawing cavity, one end of the shell withdrawing spring is fixed on the second installation limiting ring, and the other end of the shell withdrawing spring is fixed on the first installation limiting ring. Meanwhile, the length of the firing pin sleeve 23 is greater than that of the mounting through hole 32, the positioning ring is clamped in the positioning groove in a clamping mode, specifically, an annular groove is arranged outside the positioning ring, then a rubber pad with the outer diameter greater than that of the positioning ring is clamped in the annular groove, and then the positioning and the clamping of the positioning groove are achieved through the elasticity of the rubber pad. The middle of the positioning ring is provided with a through hole 38, the inner diameter of which is larger than the outer diameter of the nail and smaller than the outer diameter of the firing pin bushing, so as to ensure that the firing pin bushing 23 can push the positioning ring out of the positioning groove. Thus, when the firing assembly and the nail shooting assembly are simultaneously pushed towards the surface to be pushed in, the striker sleeve 23 penetrates through the mounting through hole 32 to be abutted against the positioning ring 36, and the positioning ring 36 can be extruded out of the positioning groove by force.

The nail shooter of the embodiment has four states in use, namely an opening state, a pre-pressing state, an exciting state and a shell withdrawing state.

Specifically, referring to fig. 3 to 5, when the nail shooter is in an open state, the return spring 12, the firing spring 24 and the ejection spring 35 are all in normal lengths, and the firing pin 27 is normally clamped at the tail end of the bar-shaped pin slot. When the nail gun is used, firstly, a nail with a nail shooting ball is placed into the installation through hole 32, one end of the nail shooting ball abuts against the firing pin sleeve, the other end of the nail shooting ball is flush with the bottom of the positioning groove, then the positioning ring 36 is clamped into the positioning groove, then the positioning ring abuts against the surface to be pushed in, the nail is aligned to the position to be pushed in, the sleeve is held to push the surface to be pushed in with force, and the T-shaped bolt is held by hand to form a prepressing state as shown in figures 6-8. In the pre-pressing state, the reset spring 12 and the firing spring 24 are compressed, and the limit sleeve 13 pushes the firing pin 24 into the mounting hole, so that the firing pin moves to the other end in the strip-shaped pin slot. Then the T-shaped bolt is loosened, the firing spring 24 is reset, the firing pin 24 is driven to move towards the other end in the strip-shaped pin groove, and the tip end of the firing pin is driven to penetrate through the limiting hole and then pierce the nail shooting bullet, so that the function is realized (see fig. 9-11).

After the use, the reset spring 12 is in a compressed state and the trigger spring 24 is in a slightly stretched state due to no external force, so that the striker base 2 is driven to reset along the strip-shaped pin groove 28. Even after the hand-held positioning seat is used for many times, the hand-held positioning seat and the hand-pulled sleeve can not be reset accurately due to reasons such as heating, and the resetting can be easily realized. When the positioning ring 36 needs to be withdrawn, referring to fig. 12 to 14, the striker sleeve 23 can push the positioning ring 36 out of the positioning bayonet between the striker sleeve and the positioning groove after passing through the mounting through hole 32 by only holding the positioning seat 3 and then pressing the T-shaped bolt, so that the shell withdrawing operation of the positioning ring is realized, and the positioning ring is taken out.

Claims

1. The split type staggered nested transmission nail shooter is cylindrical as a whole, comprises a firing assembly and a nail shooting assembly, and is characterized by further comprising a split type positioning assembly, wherein the positioning assembly is used for fixing nails to a surface to be pushed in; the nail shooting assembly and the positioning assembly are coaxially nested in a staggered manner and are used for pushing nails fixed by the positioning assembly into a surface to be pushed; the firing assembly is slidably sleeved outside the nail shooting assembly and the positioning assembly, and cavities are formed among the firing assembly, the nail shooting assembly and the positioning assembly; the firing assembly comprises a sleeve (1) and a sleeve cover (11) covering the tail of the sleeve.

2. The split type staggered-layer nested transmission nail shooter according to claim 1, wherein the nail shooting assembly comprises a needle seat (2) and a needle (21) which are sequentially connected, and a needle seat sleeve (22) and a needle shooting sleeve (23) which are sequentially connected, the needle seat is slidably connected in the needle seat sleeve to drive the needle to reciprocate in the needle shooting sleeve, and a firing spring (24) is arranged outside the needle seat; the needle seat sleeve (22) is connected in the firing assembly in a sliding mode, and a return spring (12) is arranged on the outer side of the needle seat sleeve.

3. The split type staggered nested transmission nail shooter according to claim 2, characterized in that one end of the firing pin seat (2) connected with the firing pin (21) is provided with a mounting plate (26) with the outer diameter matched with the inner diameter of the pin seat sleeve (22), one end of the firing spring (24) is fixed on the cylinder cover (11), and the other end of the firing spring is fixed on the side surface of the mounting plate, so that the firing spring is compressed when the firing assembly moves towards the surface to be pushed in.

4. The split staggered nested transmission nail shooter according to claim 2, characterized in that a first installation limiting ring (25) with an outer diameter matched with the inner diameter of the sleeve (1) is arranged outside the needle seat sleeve (22), one end of the return spring (12) is fixed on the barrel cover (11), the other end of the return spring is fixed on the side surface of the first installation limiting ring, and the return spring is compressed when the firing assembly moves towards the surface to be pushed in.

5. The split staggered nested transmission nailer of claim 4, wherein said firing assembly further includes a stop collar (13), said stop collar is disposed inside the cover and has a gap with the sleeve, a reset cavity (14) is formed among said inner sleeve wall, outer needle hub sleeve (22) and the first installation stop collar, and the reset spring (12) is located in the reset cavity.

6. The split staggered nested transmission nailer of claim 5, wherein said nailer assembly further includes a mounting hole disposed in the mounting plate (26), a firing pin (27) slidably received in the mounting hole, a bar-shaped pin slot (28) disposed on the needle hub sleeve (22) for engaging with the firing pin; the firing pin (27) is clamped at one end of the strip-shaped pin groove (28), and when the limiting sleeve (13) moves towards the first installation limiting ring (25), the firing pin (27) can be pushed down to move in the strip-shaped pin groove.

7. The split type staggered-layer nested transmission nail shooter according to any one of claims 2 to 6, wherein the positioning assembly comprises a positioning seat (3), one end of the positioning seat is provided with a mounting groove (31) matched with the needle seat sleeve (22), and the bottom of the mounting groove is provided with a mounting through hole (32) for mounting a nail shooting ball; the outer part of the firing pin sleeve (23) is matched with the mounting through hole and can reciprocate in the mounting through hole, a limiting hole through which the tip of the firing pin passes is arranged on the end face of the firing pin sleeve (23), and the tip of the firing pin penetrates through the limiting hole to pierce a nail bullet.

8. The split type staggered-layer nested transmission nail shooter according to claim 7, characterized in that a second installation limiting ring (33) is arranged on the positioning seat (3), the outer diameter of the second installation limiting ring is matched with the sleeve (1) to limit the movement of the positioning seat out of the sleeve, and a shell withdrawing cavity (34) is formed among the second installation limiting ring, the outer wall of the positioning seat (3), the inner wall of the sleeve, the first installation limiting ring (25) and the outer wall of the needle seat sleeve (22); an ejection spring (35) is arranged in the ejection cavity, one end of the ejection spring is fixed on the second mounting limiting ring, and the other end of the ejection spring is fixed on the first mounting limiting ring.

9. The split staggered drive nail shooter of claim 8, wherein the positioning assembly further comprises a positioning ring (36), a positioning groove (37) matched with the positioning ring is formed in one end, opposite to the surface to be pushed, of the positioning seat (3), and the positioning ring is clamped in the positioning groove; the middle part of the positioning ring is provided with a through hole (38), and the inner diameter of the through hole is larger than the outer diameter of the nail and smaller than the outer diameter of the firing pin sleeve so as to ensure that the firing pin sleeve can push the positioning ring out of the positioning groove.

10. The split staggered nested transmission nailer of claim 8 or 9, wherein the tail end of the striker base (2) is provided with an internal threaded hole, and a T-shaped bolt (29) is connected with the internal threaded hole in an internal thread mode.