Screw staggering mechanism

Abstract

The utility model discloses a screw staggering mechanism which comprises an axis and a screw staggering seat, a screw staggering cavity is formed in the screw staggering seat, a feeding port is formed in the first side wall of the screw staggering seat, a discharging port is formed in the bottom of the screw staggering seat, and the feeding port and the discharging port are both communicated with the screw staggering cavity; a discharge pipe is arranged at the discharge hole; the nail staggering sliding block is arranged in the nail staggering cavity; a nail clamping groove is formed in the side, facing the feeding port, of the nail staggering sliding block. The dislocation driving device is fixed on the dislocation nail seat, and the output end of the dislocation driving device is connected with the dislocation nail sliding block; the staggered nail sliding block can be driven by the staggered driving device to slide between the feeding port and the discharging port. When the nail clamping groove in the wrong nail sliding block is aligned to the feeding port, the nail clamping groove is suitable for containing the screws passing through the feeding port, and when the nail clamping groove is aligned to the discharging port, the discharging port is suitable for containing the screws in the nail clamping groove to fall into the discharging pipe. The screw staggering mechanism is high in separation efficiency, simple and compact in structure and low in needed cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to work piece misplacement technical field especially relates to a wrong screw mechanism. BACKGROUND

[0002] With the development of automation technology, equipment assembly also more and more adopts the mode of automatic assembly. In the process of automatic assembly, screw is an indispensable assembly component, and based on the screw is placed in row storage, therefore in order to realize the automatic installation of screw, it is essential to separate each screw from the whole row into single body and then carry out material distribution.

[0003] At present, the mode of copper lock jaw is generally adopted to separate screw, but the jaw in this separation mode needs to carry out a series of operations such as alignment, clamping, moving, re-alignment, loosening, etc. to complete the separation of a screw, which not only leads to low efficiency, but also makes the structure of the separation mechanism complex and the cost is high. UTILITY MODEL CONTENT

[0004] Therefore, in order to solve the problems in the prior art, the utility model provides a wrong screw mechanism which has relatively simple structure and high separation efficiency.

[0005] Therefore, the utility model provides a wrong screw mechanism, which comprises:

[0006] The wrong screw seat has a wrong screw cavity in it, and a feeding port is formed on the first side wall thereof, and a discharging port is formed at the bottom, and the feeding port and the discharging port are both communicated with the wrong screw cavity; a discharging pipe is arranged at the discharging port;

[0007] The wrong screw slide block is arranged in the wrong screw cavity; a screw clamping groove is arranged on the side of the wrong screw slide block facing the feeding port;

[0008] The misalignment driving device is fixed on the wrong screw seat, and the output end thereof is connected with the wrong screw slide block; the wrong screw slide block can slide between the feeding port and the discharging port under the driving of the misalignment driving device; when the screw clamping groove on the wrong screw slide block is aligned with the feeding port, the screw clamping groove is adapted to accommodate the screw after passing through the feeding port, and when the screw clamping groove is aligned with the discharging port, the discharging port is adapted to accommodate the screw in the screw clamping groove to fall into the discharging pipe.

[0009] Optionally, a sliding plate member is fixed in the wrong screw seat, a sliding groove corresponding to the sliding plate member is arranged on the wrong screw slide block, the wrong screw slide block is clamped on the sliding plate member through the sliding groove, and the wrong screw slide block can slide along the sliding plate member.

[0010] Optionally, the sliding groove is arranged on one side of the clamping groove on the staggered nail slider; the sliding plate member is correspondingly fixed to the inner side of the first side wall of the staggered nail seat, the sliding plate member is provided with an inlet opening and a sliding hole which are in communication; when the clamping groove is aligned with the inlet opening, the inlet opening is aligned with the clamping groove, and when the staggered nail slider slides along the sliding plate member, the screw in the clamping groove slides in the sliding hole.

[0011] Optionally, the width of the inlet opening is smaller than the width of the head of the screw, and when the screw is embedded in the clamping groove, the head of the screw is clamped above the inlet opening; the end of the sliding hole away from the inlet opening is an outlet end, the width of the outlet end is greater than the width of the head of the screw, and when the clamping groove is aligned with the outlet opening, the screw reaches the outlet end.

[0012] Optionally, the inner side of the first side wall of the staggered nail seat is provided with a fixed plate groove, and the sliding plate member is clamped in the fixed plate groove.

[0013] Optionally, the staggered screw mechanism further comprises:

[0014] The screw detection device is arranged at the top end of the staggered nail seat, and the detection end thereof extends into the staggered nail cavity; when the clamping groove is aligned with the inlet opening, the screw detection device is also aligned with the clamping groove; when the screw detection device detects the screw in the clamping groove, the staggered driving device drives the staggered nail slider to slide towards the outlet opening.

[0015] Optionally, a blowing pipe is further arranged between the outlet pipe and the outlet opening, the blowing pipe has an outlet hole and a blowing hole, the two ends of the outlet hole are respectively connected with the outlet opening and the outlet pipe, one end of the blowing hole is connected with the outlet hole, and the other end forms a blowing port in the side wall of the blowing pipe.

[0016] Optionally, the first limiting member is a first limiting bolt which is threadedly connected with the staggered nail seat, the second limiting member is a second limiting bolt which is threadedly connected with the staggered nail seat, and the threaded ends of the first limiting bolt and the second limiting bolt both extend out of the staggered nail seat.

[0017] Optionally, the first limiting member is a first limiting bolt which is threadedly connected with the staggered nail seat, the second limiting member is a second limiting bolt which is threadedly connected with the staggered nail seat, and the threaded ends of the first limiting bolt and the second limiting bolt both extend out of the staggered nail seat.

[0018] The technical scheme provided by the utility model has the following advantages:

[0019] The staggered screw mechanism provided by the utility model comprises a staggered nail seat which has a staggered nail cavity inside and is provided with an inlet opening and an outlet opening, and a staggered nail slider which has a clamping groove and can transport a screw is arranged in the staggered nail seat, so that the screw in the whole row of screws can be transported from the inlet opening to the outlet opening one by one under the driving of the staggered driving device when the staggered nail slider reciprocally slides between the inlet opening and the outlet opening, the staggered separation operation is realized, the separation efficiency is high, and the structure of the staggered screw mechanism is simple, compact and low in cost. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the screw mechanism provided in an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the screw clamping groove on the screw-clamping slider in the screw-clamping mechanism when it is aligned with the feed port.

[0023] Figure 3 This is a schematic diagram of the internal structure of the screw clamping groove on the screw-clamping slider in the screw-clamping mechanism when it is aligned with the discharge port.

[0024] Figure 4 An exploded view of the screw mechanism provided in this embodiment of the utility model;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Opposite nail seat; 11-Inlet; 12-Outlet; 13-Fixing plate groove; 14-Fixing bolt; 15-First limit bolt; 16-Second limit bolt; 1a-First sidewall;

[0027] 2-Slippery nail slider; 21-Nail clamping groove; 22-Sliding groove;

[0028] 3-Misalignment drive device;

[0029] 4-Discharge pipe;

[0030] 5-Base; 51-First base plate; 52-Second base plate;

[0031] 6- Screw detection device;

[0032] 7-Sliding plate; 71-Inlet pin; 72-Sliding pin hole; 72a-Outlet pin end;

[0033] 8-Air blowing pipe; 81-Discharge hole; 82-Air blowing hole;

[0034] 9-Screw. Detailed Implementation

[0035] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0039] Please refer to Figures 1-4 A structure schematic view of a cross-screw mechanism provided by the embodiment of the present application, the cross-screw mechanism comprises a cross-screw seat 1, a cross-screw sliding block 2, a cross-position driving device 3 and a discharge pipe 4; wherein the cross-screw seat 1 has a cross-screw cavity inside, and a feeding port 11 is formed on the first side wall 1a thereof, a discharge port 12 is formed at the bottom, and the feeding port 11 and the discharge port 12 are both communicated with the cross-screw cavity; the discharge pipe 4 is arranged at the discharge port 12; the cross-screw sliding block 2 is arranged in the cross-screw cavity, and a nail clamping groove 21 is arranged on the side of the cross-screw sliding block 2 facing the feeding port 11; the cross-position driving device 3 is fixed on the cross-screw seat 1, and the output end thereof is connected with the cross-screw sliding block 2, and the cross-screw sliding block 2 can slide between the feeding port 11 and the discharge port 12 under the driving of the cross-position driving device 3.

[0040] The cross-screw mechanism in the embodiment, such as Figure 1 and Figure 2As shown, when the clamping slot 21 on the misaligned nail slider 2 is aligned with the feeding port 11, the clamping slot 21 is adapted to accommodate the screw 9 after passing through the feeding port 11, as shown. Figure 3 As shown, when the clamping slot 21 is aligned with the discharging port 12, the discharging port 12 is adapted to accommodate the screw 9 in the clamping slot 21 to fall into the discharging pipe 4.

[0041] In the embodiment, if the side wall opposite to the first side wall 1a is regarded as the second side wall, and the two side walls between the first side wall 1a and the second side wall are regarded as the third side wall and the fourth side wall, then the first side wall 1a and the second side wall are the side walls on both sides of the sliding direction of the misaligned nail slider 2, and the third side wall and the fourth side wall are the side walls at both ends of the sliding direction of the misaligned nail slider 2.

[0042] In the embodiment, the misaligned nail cavity can be directly used as the sliding track of the misaligned nail slider 2. At this time, in order to reduce the sliding friction of the misaligned nail slider 2, a plurality of protrusions can be arranged on the two side walls of the misaligned nail slider 2 corresponding to the first side wall 1a and the second side wall, and the protrusions extend along the sliding direction of the misaligned nail slider 2, so as to reduce the direct contact area between the misaligned nail slider 2 and the first side wall 1a and between the misaligned nail slider 2 and the second side wall, thereby reducing the sliding friction of the misaligned nail slider 2. In specific implementation, when there are two or more than two protrusions arranged at intervals on each side wall, the top surface of the protrusion can be arranged as an arc surface, so that the contact between the misaligned nail slider 2 and the first side wall 1a and between the misaligned nail slider 2 and the second side wall is linear contact, so as to further reduce the sliding friction of the nail slider.

[0043] In the embodiment, in order to improve the sliding stability of the misaligned nail slider 2 and further improve the operation stability of the misaligned nail mechanism, a sliding rail can be arranged on the inner wall of the misaligned nail seat 1, and a corresponding sliding groove is arranged on the misaligned nail slider 2. Specifically, the sliding rail can be arranged on the bottom of the misaligned nail seat 1, the first side wall 1a or the second side wall.

[0044] Those skilled in the art should understand that, in order to separate each screw 9 from the nail row in turn, the nail row needs to be continuously pushed towards the feeding port 11 of the misaligned nail mechanism, so that each screw 9 passes through the feeding port 11 in turn and then enters the clamping slot 21. Therefore, when applied to an automatic device, the automatic device also needs to be provided with a nail row transmission mechanism corresponding to the misaligned nail mechanism in the embodiment. In order to expand the application scope of the misaligned nail mechanism in the embodiment, as an optional specific implementation, as shown in Figure 1 and Figure 4As shown, the staggered screw mechanism in the embodiment can further include a base 5, which includes a first seat plate 51 and a second seat plate 52 located above the first base 5, at least two threaded studs are arranged between the first seat plate 51 and the second seat plate 52, and at least two nuts are arranged on each threaded stud. The distance between the second seat plate 52 and the first seat plate 51 can be adjusted by adjusting the position of the nut on the threaded stud. At this time, the staggered screw mechanism in the embodiment can be matched with a plurality of nail row transmission mechanisms with different transmission surface heights, and has a wide range of applications.

[0045] In the embodiment, the driving frequency of the staggered driving device 3 and the transmission speed of the nail row transmission device can be correspondingly set to ensure that the staggered screw mechanism can continuously and accurately separate screws.

[0046] In specific implementation, the staggered driving device 3 can be a driving cylinder, and of course, it can also be other driving devices capable of driving the staggered nail slider 2 to slide linearly.

[0047] In the embodiment, in order to further ensure the operation accuracy of the staggered screw mechanism, as shown, Figures 1-3 As shown, the staggered screw mechanism can further include a screw detection device 6, which is arranged at the top end of the staggered nail seat 1 and has a detection end extending into the staggered nail cavity. When the nail clamping groove 21 is aligned with the feeding port 11, the screw detection device 6 is also aligned with the nail clamping groove 21. When the screw detection device 6 detects the screw 9 in the nail clamping groove 21, the staggered driving device 3 drives the staggered nail slider 2 to slide towards the discharging port 12.

[0048] In specific implementation, the screw detection device 6 can be a proximity switch.

[0049] As an optional specific implementation, one or more of the first side wall 1a, the second side wall, and the top plate of the staggered nail cavity of the staggered nail seat 1 can be detachable, so as to facilitate the assembly of the staggered nail seat 1, the screw detection device 6, and the staggered driving device 3, and at the same time, the staggered nail slider 2 in the staggered nail seat 1 can be replaced with different models (each model of the staggered nail slider 2 is matched with at least one model of the screw 9), so as to further expand the application range of the staggered screw mechanism in the embodiment.

[0050] As an optional specific implementation, as shown in Figure 1 and Figure 4 As shown, a sliding plate member 7 can be fixed in the staggered nail seat 1, and the sliding plate member 7 can be used as a sliding track of the staggered nail slider 2. At this time, the staggered nail slider 2 is provided with a sliding groove 22 corresponding to the sliding plate member 7, the staggered nail slider 2 is clamped on the sliding plate member 7 through the sliding groove 22, and the staggered nail slider 2 can slide along the sliding plate member 7.

[0051] As an alternative embodiment, in order to further reduce the size of the cross-screw mechanism and reduce the space occupied, as shown in Figure 1 and Figure 4 , the sliding groove 22 can be arranged on the side of the cross-screw slider 2 where the clamp groove 21 is located; at this time, the sliding plate member 7 is correspondingly fixed to the inner side of the first side wall 1a of the cross-screw seat 1, and the sliding plate member 7 is provided with an inlet opening 71 and a sliding screw hole 72 which are in communication; when the clamp groove 21 is aligned with the inlet opening 11, the inlet opening 71 is aligned with the clamp groove 21, and when the cross-screw slider 2 slides along the sliding plate member 7, the screw 9 in the clamp groove 21 slides in the sliding screw hole 72.

[0052] Specifically, as shown in Figure 4 , a fixed plate groove 13 can be arranged on the inner side of the first side wall 1a of the cross-screw seat 1, and the sliding plate member 7 is clamped in the fixed plate groove 13, thereby fixing the sliding plate member 7 to the inner side of the first side wall 1a of the cross-screw seat 1.

[0053] In specific implementation, in order to further improve the stability of the sliding plate member 7, as shown in FIGS. 1 and Figure 4 , two fixed bolts 14 can be arranged on the cross-screw seat 1 and extend through the third side wall and the fourth side wall, respectively; when the sliding plate member 7 is clamped in the fixed plate groove 13, the two fixed bolts 14 abut against the two ends of the sliding plate member 7, thereby fixing the sliding plate member 7; in specific implementation, the extension length of the fixed bolt 14 in the cross-screw seat 1 can be adjusted by rotating the end of the fixed bolt 14 which extends out of the cross-screw seat 1, thereby facilitating the assembly and fixation of the sliding plate member 7.

[0054] In specific implementation, the nut of each fixed bolt 14 can be arranged on the part of the fixed bolt 14 which extends out of the cross-screw seat 1, and when the end of the fixed bolt 14 which extends into the cross-screw seat 1 abuts against the sliding plate member 7, the nut abuts against the outer wall of the cross-screw seat 1, thereby further improving the fixation effect of the fixed bolt 14.

[0055] In specific implementation, in order to prevent the screw 9 from being disturbed in the clamp groove 21 when the cross-screw slider 2 slides from the inlet opening 11 to the outlet opening 12, as shown in Figure 1 and 4 , the width of the inlet opening 71 can be less than the width of the head of the screw 9, so that when the screw 9 is embedded in the clamp groove 21, the head of the screw 9 is clamped above the inlet opening 71; at this time, the end of the sliding screw hole 72 away from the inlet opening 71 is an outlet end 72a, and the width of the outlet end 72a is greater than the width of the head of the screw 9, so that when the clamp groove 21 is aligned with the outlet opening 12, the screw 9 can still directly fall into the discharge pipe 4 at the outlet opening 12 from the clamp groove 21 when the screw 9 reaches the outlet end 72a.

[0056] As an optional specific embodiment, in order to further improve the operation stability and screw separation accuracy of the cross-screw mechanism in the embodiment, the cross-screw seat 1 in the embodiment can be further provided with a first limiting piece and a second limiting piece. When the clamp screw groove 21 is aligned with the feeding port 11, the cross-screw slider 2 abuts against the first limiting piece. When the clamp screw groove 21 is aligned with the discharging port 12, the cross-screw slider 2 abuts against the second limiting piece.

[0057] In specific implementation, the first limiting piece and the second limiting piece can be limiting blocks fixed in the cross-screw seat 1.

[0058] In specific implementation, as shown in Figure 1 , the first limiting piece can be a first limiting bolt 15 threadedly connected with the cross-screw seat 1, and the second limiting piece can be a second limiting bolt 16 threadedly connected with the cross-screw seat 1. The threaded heads of the first limiting bolt 15 and the second limiting bolt 16 both extend outside the cross-screw seat 1. At this time, when the cross-screw slider 2 in the cross-screw seat 1 is replaced by a different model and the corresponding limiting position changes, the first limiting bolt 15 and the second limiting bolt 16 can be adjusted to the corresponding limiting position by being screwed.

[0059] In specific implementation, in order to improve the stability of the first limiting bolt 15 and the second limiting bolt 16, as shown in Figure 1 , the nut of each of the first limiting bolt 15 and the second limiting bolt 16 can be arranged on the part extending outside the cross-screw seat 1, and the nut can abut against the outer wall of the cross-screw seat 1.

[0060] As an optional specific embodiment, in order to improve the discharging efficiency, as shown in Figure 1 and Figure 4 , a blowing pipe 8 can be arranged between the discharging pipe 4 and the discharging port 12. The blowing pipe 8 has a discharging hole 81 and a blowing hole 82. The two ends of the discharging hole 81 are respectively connected with the discharging port 12 and the discharging pipe 4. One end of the blowing hole 82 is connected with the discharging hole 81, and the other end forms a blowing port in the side wall of the blowing pipe 8.

[0061] In specific implementation, the blowing hole 82 is used to be connected with a blowing device.

[0062] In summary, the cross-screw mechanism in the embodiment can realize the cross-position separation operation of transporting the screws 9 in the whole row of screws 9 from the feeding port 11 to the discharging port 12 one by one when the cross-screw slider 2 with the clamp screw groove 21 that can transport the screws 9 is arranged in the cross-screw seat 1 and is driven by the cross-position driving device 3 to reciprocate between the feeding port 11 and the discharging port 12. The separation efficiency is high. Moreover, the cross-screw mechanism has simple and compact structure and requires low cost.

[0063] Obviously, the above embodiments are merely exemplary and not intended to limit the embodiments. Based on the above description, one of ordinary skill in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A misaligned screw mechanism, characterized in that, The utility model provides a screw misplacement device, which comprises a screw misplacement seat and a screw misplacement slider. The screw misplacement seat comprises a first side wall, a second side wall, a bottom wall, a first side wall inner side, a second side wall inner side, a bottom wall inner side, a screw misplacement cavity, a feeding port, a discharging port, a discharging pipe, a first limiting piece and a second limiting piece. The screw misplacement slider comprises a clamping slot and a sliding slot. The screw misplacement cavity is internally provided with the screw misplacement cavity, and the first side wall of the screw misplacement seat is provided with the feeding port and the discharging port. The feeding port and the discharging port are in communication with the screw misplacement cavity.

2. The prismatic screw mechanism of claim 1, wherein, The discharging pipe is arranged at the discharging port.

3. The prismatic screw mechanism of claim 2, wherein, The clamping slot is arranged on one side of the screw misplacement slider facing the feeding port.

4. The prismatic screw mechanism of claim 3, wherein, The screw misplacement driving device is fixed on the screw misplacement seat, and the output end is connected with the screw misplacement slider.

5. The prismatic screw mechanism of claim 3, wherein, The screw misplacement slider can slide between the feeding port and the discharging port under the driving of the screw misplacement driving device.

6. The skewer mechanism according to any one of claims 1 to 5, wherein When the clamping slot is aligned with the feeding port, the clamping slot is suitable for accommodating the screw after passing through the feeding port. When the clamping slot is aligned with the discharging port, the discharging port is suitable for accommodating the screw in the clamping slot to fall into the discharging pipe.

7. The skewer mechanism according to any one of claims 1 to 5, wherein The screw misplacement seat is internally fixed with a sliding plate, and the screw misplacement slider is provided with a sliding slot corresponding to the sliding plate.

8. The prismatic screw mechanism of claim 1, wherein, The screw misplacement slider is clamped on the sliding plate through the sliding slot, and the screw misplacement slider can slide along the sliding plate. The sliding slot is arranged on the side of the clamping slot on the screw misplacement slider. The sliding plate is correspondingly fixed on the inner side of the first side wall of the screw misplacement seat. The sliding plate is provided with a feeding port and a sliding hole in communication. When the clamping slot is aligned with the feeding port, the feeding port is aligned with the clamping slot. When the screw misplacement slider slides along the sliding plate, the screw in the clamping slot slides in the sliding hole. The width of the feeding port is smaller than the width of the head of the screw. When the screw is embedded in the clamping slot, the head of the screw is clamped above the feeding port. The end of the sliding hole away from the feeding port is a discharging end, and the width of the discharging end is greater than the width of the head of the screw. When the clamping slot is aligned with the discharging port, the screw reaches the discharging end. The inner side of the first side wall of the screw misplacement seat is provided with a fixed plate groove, and the sliding plate is clamped in the fixed plate groove. The screw detection device is arranged at the top end of the screw misplacement seat, and the detection end extends into the screw misplacement cavity. When the clamping slot is aligned with the feeding port, the screw detection device is also aligned with the clamping slot. When the screw detection device detects the screw in the clamping slot, the screw misplacement driving device drives the screw misplacement slider to slide towards the discharging port. The discharging pipe and the discharging port are further provided with a blowing pipe. The blowing pipe is internally provided with a discharging hole and a blowing hole. The discharging hole is respectively connected with the discharging port and the discharging pipe at both ends. The blowing hole is in communication with the discharging hole at one end, and a blowing port is formed on the side wall of the blowing pipe at the other end. The screw misplacement seat is provided with a first limiting piece and a second limiting piece. When the clamping slot is aligned with the feeding port, the screw misplacement slider is in contact with the first limiting piece. When the clamping slot is aligned with the discharging port, the screw misplacement slider is in contact with the second limiting piece.

9. The prismatic screw mechanism of claim 8, wherein, The first limiting member is a first limiting bolt in threaded connection with the staggered nail seat, and the second limiting member is a second limiting bolt in threaded connection with the staggered nail seat, and the threaded heads of the first limiting bolt and the second limiting bolt both extend outside the staggered nail seat.

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