CN219109688U

CN219109688U - Universal adjustable locking external fixing frame

Info

Publication number: CN219109688U
Application number: CN202220530098.1U
Authority: CN
Inventors: 陈聚伍
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-12
Filing date: 2022-03-12
Publication date: 2023-06-02
Anticipated expiration: 2032-03-12

Abstract

The utility model discloses a universal adjustable locking external fixing frame which comprises a middle main support and two end auxiliary supports, wherein at least two ends of the middle main support are respectively provided with a penetrating locking nail hole, matched locking nails are arranged on the middle main support in a matching mode, each end auxiliary support is respectively provided with a penetrating locking nail hole, matched locking nails are arranged on the auxiliary supports, and two ends of the middle main support are respectively sleeved with the two end auxiliary supports, so that the two end auxiliary supports can rotate and stretch along the middle main support. The universal adjustable locking external fixing frame provided by the utility model can easily adjust the positions of the locking nail holes at two sides, is convenient and labor-saving, bypasses encountered blood vessels or nerve tissues, avoids the trouble that the operation needs to be bent when a hard rod piece is used for avoiding, reduces the use of connecting fasteners by sleeved rod pieces, ensures that the fracture part is more convenient to lock and fix, reduces the cost of the external fixing frame, lightens the weight and the volume of the fixing frame, and provides more comfortable use experience for fracture patients.

Description

Universal adjustable locking external fixing frame

Technical Field

The utility model belongs to the technical field of surgical treatment, and particularly relates to a universal adjustable locking external fixing frame capable of freely deflecting an angle.

Background

The external fixing support for fracture is mainly formed by connecting external fixing support rods through external fixing screws. The external fixing support is mainly used for various open fracture injuries with serious limbs, maintains the stability and the position of fracture as much as possible and reduces the fracture dislocation risk. In the case of fracture crushing or infection, the fracture is fixed externally and then the upper and lower ends of the fracture are fixed. The lead fixation is coupled to the external fixator and then adjusted to the extent that the fixation may be performed for comminuted fracture or where internal fixation is not appropriate and to assist in fracture healing.

The external fixing frame for fracture has the functions of supporting and fixing. After fracture, some patients have no way to perform surgical treatment immediately or to perform internal fixation treatment due to physical reasons or to the extent of soft tissue and open contamination of the skin at the fracture site, so that only external fixation stents can be used for treatment. The external fixing bracket does not cross the broken end of the fracture and is far away from the fracture part, so the safety of tissues is relatively better, the infection after the fracture caused by pollution of the broken end is avoided, and even osteomyelitis can be avoided. So the external fracture fixation frame is very important in the treatment of fracture.

When current outer frame is fixed to two sections of fracture, need at least two staple in every section just can ensure that outer frame is fixed after, two sections of fracture can not appear swinging, rotate and axial telescopic movement, but during actual operation, fix two inboard frame holes earlier, then fix two outside frame holes, because two inboard frame holes can freely select fixed position when being fixed, easy fixing, but two outside frame holes are fixed, can appear sometimes that the hole site is issued and is aimed at blood vessel or nerve, can't directly nail down, lead to outer frame fixed difficulty, even need punch fixed problem again.

In addition, the existing external fixing frame is generally made of hard cylindrical metal rods, and is fixedly combined through connecting fasteners and the like to form a stable and firm frame body when in use, so that the fracture position is assisted to be positioned and recovered. When the existing external fixing frame is used, a certain problem exists, a large amount of tissues such as blood vessels and nerves exist in a human body, and in order to prevent the locking nails inserted into broken bones from damaging the blood vessels or the nerves, a hard metal rod piece is required to be bent, or the hard metal rod piece is required to be connected with a fastener through deflection to avoid the blood vessels or the nerves.

The common outer frame metal rod is quite firm, the bending is time-consuming and labor-consuming, the positioning is not easy, the connecting fastener deflects to avoid the blood vessel easily, but the locking and the fixing are difficult.

Disclosure of Invention

Aiming at the defects and problems of inconvenient actions of patients in the rehabilitation process caused by complex structure and larger nodes of the external fixing frame, the utility model provides the universal adjustable locking external fixing frame capable of freely deflecting angles.

The utility model solves the technical problems by adopting the scheme that: the utility model provides a universal adjustable locking external fixation frame, includes middle part main support and both ends auxiliary support, middle part main support on be provided with the locking nail hole that runs through respectively at its both ends to the cooperation is installed the locking nail of matching, respectively sets up one on the auxiliary support of every end and runs through the locking nail hole, and the cooperation is installed the locking nail of matching, the both ends of middle part main support respectively with both ends auxiliary support suit together, make both ends auxiliary support can rotate and/or telescopic movement along the middle part main support.

The utility model further provides a universal adjustable locking external fixator, wherein the locking nail comprises a locking nail threaded section with a larger upper section diameter and a self-tapping threaded section with a smaller lower section diameter.

The utility model further provides a universal adjustable locking external fixing frame which comprises a cylindrical sleeve type main support and two cylindrical sleeve type auxiliary supports, wherein the sleeve type auxiliary supports are symmetrically arranged at two ends of the sleeve type main support, the diameter of the sleeve type main support is thicker, and the diameters of the sleeve type auxiliary supports arranged at two ends are thinner.

The utility model further provides a universal adjustable locking external fixing frame, and the locking nail thread section with larger diameter at the upper section of the locking nail is matched with the size of the locking nail hole.

The utility model further provides a universal adjustable locking external fixing frame, two ends of the sleeve type main support are provided with sleeves matched with the sleeve type auxiliary supports, the sleeve type auxiliary supports are sleeved in the sleeves, and the sleeve type auxiliary supports freely rotate along the axis of the sleeves and stretch out and draw back along the sleeve direction.

The utility model further provides a universal adjustable locking external fixing frame which comprises a sleeve type main support and sleeve type auxiliary supports, wherein the sleeve type main support is arranged in the middle, the sleeve type auxiliary supports are arranged at two ends of the sleeve type main support, the sleeve type main support is a solid cylindrical rod body with smaller diameter, and the sleeve type auxiliary supports with thicker diameters are sleeved at two ends of the cylindrical rod body.

The utility model further provides a universal adjustable locking external fixing frame, the end part of the sleeve type auxiliary support is provided with a circular cavity, and the circular cavity of the sleeve type auxiliary support is sleeved at the two ends of the sleeve type main support.

The utility model further provides a universal adjustable locking external fixing frame, the centers of two end faces of a middle main support are provided with cylindrical connecting rods, two end auxiliary supports are provided with corresponding cylindrical cavities, and the auxiliary supports are sleeved on the middle main support through the cylindrical cavities.

The utility model further provides a universal adjustable locking external fixing frame, the centers of two end faces of the middle main support are provided with cylindrical cavities, the auxiliary support is provided with corresponding cylindrical connecting rods, and the auxiliary support is sleeved on the middle main support through the connecting rods.

The utility model further provides a universal adjustable locking external fixing frame, and the middle main support is a rectangular plate-type main support.

The main part middle part at the main part of board-like main support is provided with the adjustment tank along length direction, matches the cover at the adjustment tank and is equipped with two interior sliders, and every interior slider middle part sets up the lock nail hole respectively, is provided with the location track between adjustment tank inner wall and the interior slider both sides wall for interior slider only can follow length direction and can not drop for the adjustment tank the lock silk is installed to the sleeve-type auxiliary support cup joint position, through locking the lock silk, can be with sleeve-type auxiliary support and sleeve-type main support fixed as an organic wholely.

Or, be provided with the adjustment tank along length direction at the main part middle part of board-like main support, match the cover in the adjustment tank and be equipped with two interior sliders, every interior slider middle part sets up the lock nail hole respectively, is provided with the locating rail between adjustment tank inner wall and the interior slider both sides wall for interior slider only can follow length direction and can not drop for the adjustment tank, only have outside convex post section at the both ends of board-like main support, and set up the lock nail hole on the post section.

The utility model has the beneficial effects that: compared with the existing external fixing frame, the universal adjustable locking external fixing frame provided by the utility model can easily adjust the positions of the nail locking holes on two sides close to the outer end, is convenient and labor-saving, bypasses encountered blood vessels or nerve tissues, avoids the trouble that the operation needs to be bent when a hard rod piece is used for avoiding, and simultaneously combines the whole sleeved rod pieces together, so that the use of connecting fasteners is reduced, the locking and fixing of fracture parts are more convenient, the cost of the external fixing frame is reduced, the weight and the volume of the fixing frame are reduced, more comfortable use experience is provided for fracture patients, and the patient can move more conveniently due to lighter weight and the reduced volume of the frame body in reply.

Drawings

Fig. 1 is a schematic structural view of the application state of the present utility model.

Fig. 2 is a schematic perspective view of the present utility model.

Fig. 3 is a schematic top view of the present utility model.

Fig. 4 is a schematic side view partially in cross-section of the present utility model.

Fig. 5 is a schematic structural view of another embodiment of the present utility model.

Fig. 6 is a schematic structural view of yet another embodiment of the present utility model.

Fig. 7 is a schematic diagram showing a modified structure of the embodiment shown in fig. 6 according to the present utility model.

Fig. 8 is a schematic view of another modification of the embodiment of fig. 6 according to the present utility model.

Fig. 9 is a schematic perspective view of another embodiment of the present utility model.

Reference numerals in the drawings: sleeve-type main support 1, sleeve-type auxiliary support 2, fixed lock nail hole 3, free lock nail hole 4, lock nail 5, lock nail screw thread section 6, self-tapping screw thread section 7, sleeve-type main support 8, sleeve-type auxiliary support 9, plate-type main support 10, adjustment groove 11, inner slider 12, positioning rail 13, lock wire 14.

Detailed Description

The existing external fixation frame is generally manufactured by adopting a plurality of hard cylindrical metal rods, at least four fixing nails and a plurality of groups of node fixing pieces are matched for fixing, at least two fixing nails are needed for fixing each section of the fracture, usually one metal rod is connected between adjacent nodes, one to two node fixing pieces are arranged on each fixing nail, the whole external fixation frame is complex and huge in structure, and a patient is heavy in rehabilitation process and easy to touch. In order to reduce the number of metal rods or even fix the outer frame for fixing one metal rod at the top of all the fixing nails, although the outer frame structure and the number of node fixing parts are simplified, the fixing positions between the fixing nails and the outer frame are determined in advance and cannot be adjusted, so that when four fixing nails are fixed, in order to be matched with a single outer frame for fixing, one or two fixing nails at the outermost side are often not at the optimal fixing positions, and even the last fixing nail issues blood vessels and nerve tissues, so that the fixing nails cannot be effectively fixed. In view of the foregoing, the present utility model is further described below with reference to the drawings and examples.

Example 1: aiming at the problems, a mode is adopted to adopt the universal adjustable locking external fixing frame shown in the figure 1, a rod piece of the external fixing frame is arranged outside a fracture part in a mode of being approximately parallel to the trend of broken bones, four locking nails 5 sequentially penetrate through four corresponding through holes on the rod piece and then are inserted into bones, each bone segment is fixed through at least two locking nails 5, and the two segments are connected in series and fixed into a whole in a mode of one rod and multiple nails, so that the structural stability of two segments after butt joint and reduction of the fracture is ensured.

As shown in fig. 2, each locking pin 5 sequentially comprises a top cap, a pin thread section 6 and a self-tapping thread section 7, the pin thread section 6 with larger diameter is arranged below the top cap, the self-tapping thread section 7 with smaller diameter is arranged below the pin thread section 6, when in use, the locking pin 5 passes through a through hole on a rod piece, the self-tapping thread section with smaller diameter is screwed into bone, and the pin thread section 6 with larger diameter is matched and fixedly arranged in a pin hole of the rod piece.

As shown in fig. 3, the rod member of the external fixator comprises a cylindrical sleeve-type main support 1 positioned in the middle and two cylindrical sleeve-type auxiliary supports 2 positioned at two ends, wherein the sleeve-type auxiliary supports 2 are symmetrically arranged at two ends of the sleeve-type main support 1, for example, in fig. 3, the outer diameter of the sleeve-type main support 1 is thicker, the outer diameters of the sleeve-type auxiliary supports 2 arranged at two ends are thinner, the inner diameter of the single sleeve-type main support 1 is matched with the outer diameters of the sleeve-type auxiliary supports 2, and the sleeve-type auxiliary supports can be matched and sleeved. Thus, the two-stage telescopic auxiliary bracket 2 can be freely extended and retracted and rotated at the end of the telescopic main bracket 1.

Wherein, sleeve type main support 1 is last to be symmetrically to be provided with two fixed lock nail holes 3, sets up the internal thread in the fixed lock nail hole 3, and the internal thread can with the locking screw thread section 6 assorted of locking nail, locking screw thread section 6 suit can realize stable integrated configuration in fixed lock nail hole 3 promptly, guarantees that locking nail 5 after the suit remains stable.

The two sleeve rod type auxiliary supports 2 are symmetrically arranged at two ends of the sleeve type main support 1, free locking nail holes 4 are formed in positions close to the outer ends of the sleeve rod type auxiliary supports 2, and threads are arranged in the free locking nail holes 4 and matched with locking nail thread sections 6.

As shown in fig. 4, the sleeve-type main support 1 and the sleeve-type auxiliary support 2 are solid rod bodies, sleeve sections matched with the sleeve-type auxiliary support 2 are arranged at two ends of the sleeve-type main support 1, one end, far away from the free nail locking hole 4, of the sleeve-type auxiliary support 2 is inserted into the sleeve, and the sleeve-type auxiliary support 2 can freely rotate along the axis of the sleeve and stretch out and draw back along the sleeve direction. The extension degree is limited by the length of the sleeve, and the sleeve type main support 1 and the sleeve type auxiliary support 2 are ensured to be firm and stable in the extension process.

The specific use mode is as follows: the sleeve type main support 1 is arranged above a fracture part, the fixing locking nail holes 3 are arranged on two sides of the fracture part, the two locking nails 5 sequentially penetrate through the fixing locking nail holes 3 respectively, the self-tapping thread sections 7 of the locking nails penetrate deep into the broken bone to be fixed, the locking nail thread sections 6 and the fixing locking nail holes 3 are fixed through thread sleeves, and accordingly the sleeve type main support 1 is fixed at a proper position.

After the sleeve type main support 1 is fixed, the sleeve type auxiliary support 2 is stretched and rotated, so that the free locking nail holes 4 at the two ends select the optimal nailing angle position, the free locking nail holes 4 are ensured to avoid blood vessels and nerve tissues, and at the moment, locking nails 5 are penetrated into the free locking nail holes 4 for fixing.

After two nails, namely the fixed nail locking hole 3 and the free nail locking hole 4, positioned on any bone segment are fixed, the two nails are restrained by utilizing the bone strength of the bone segment, so that one fixed nail locking hole 3 and one free nail locking hole 4 of the bone segment can not move back and forth any more and can not rotate and swing any more. A fixed locking hole 3 and a free locking hole 4 of the other bone segment will not move back and forth, rotate and swing. Therefore, under the action of the sleeve-type main support 1, the sleeve-type auxiliary support 2 and the four fixing nails, two sections of the fracture are fixed after being butted, and bone growth recovery after the butt joint of the fracture part is facilitated.

Compared with the existing external fixation frame, the locking external fixation frame of the embodiment has the universal adjustable function, the positions of the locking nail holes at the outer ends of the two sides can be easily adjusted, encountered blood vessels or nerve tissues can be conveniently bypassed, the trouble of bending hard rod pieces is avoided, meanwhile, the sleeved rod pieces are integrally combined together, no fastener is used, the structure of the external fixation frame is obviously simplified, the weight and the volume of the fixation frame are reduced, and the moderate activity requirement of the rehabilitation process of a patient is met. The external fixing frame can also enable the locking of the fracture part to be more convenient, reduce the cost of the external fixing frame and provide more comfortable use experience for fracture patients.

Example 2: the present embodiment is a modified structure extending on the basis of embodiment 1, and the structure is specifically shown in fig. 5, and includes a main rod-type bracket 8 in the middle and auxiliary sleeve-type brackets 9 mounted at both ends.

In this embodiment, the main support 8 is a solid cylindrical rod with a smaller diameter, and the two ends of the cylindrical rod are sleeved with the auxiliary supports 9 with larger diameters.

Wherein, the sleeve rod type main bracket 8 is provided with two symmetrical fixing locking nail holes 3, the distance between the symmetrical fixing locking nail holes 3 is set in a proper range in advance, and the sleeve locking nail 5 is convenient to use; one end of the sleeve type auxiliary support 9 is provided with a free locking nail hole 4, the free locking nail hole 4 is mutually perpendicular to the sleeve type auxiliary support 9, the other end of the sleeve type auxiliary support 9 is provided with a circular cavity matched with the sleeve type main support 8 in size, and the circular cavity is arranged along the rod body direction of the sleeve type auxiliary support 9 and is in a concentric circle structure with the rod body of the sleeve type auxiliary support 9.

The sleeve-type auxiliary support 9 is sleeved at two ends of the sleeve-type main support 8 through a round cavity at the end part, and the sleeve-type auxiliary support 9 can stretch and rotate along the rod body of the sleeve-type main support 8.

The present embodiment can achieve the adjusting function and the use effect similar to those of embodiment 1.

Example 3: as further shown in fig. 6, this embodiment provides a universal adjustable locking external fixing frame with an oval or oblate cross section as shown in the drawing, wherein the middle main support and the two end auxiliary supports are respectively oval or oblate rod bodies with the same size, and corresponding fixing locking nail holes 3 and free locking nail holes 4 are formed in the middle main support and the two end auxiliary supports in the manner of embodiment 1 and embodiment 2.

The middle main support and the auxiliary supports at the two ends are installed in a sleeved mode, and two specific sleeved modes are adopted: the two ends of the middle main support are provided with corresponding cylindrical cavities, and the cylindrical connecting rods at the two ends of the middle main support are inserted into the cylindrical cavities of the auxiliary supports, so that the sleeving between the main support and the auxiliary supports is realized; the second mode is that cylindrical cavities are arranged at the centers of two end faces of the middle main support, corresponding cylindrical connecting rods are arranged on the auxiliary support, and sleeving relation is achieved by inserting the auxiliary support into the cylindrical cavities at two ends of the middle main support.

The cylindrical connecting rod is arranged on the main support or the auxiliary support, and is of an integrated structure with the corresponding support which is connected, and the integrated structure can effectively improve the structural strength of the external fixing frame.

Example 4: further on the basis of embodiment 3, as shown in fig. 7, the auxiliary brackets at both ends have a cylindrical structure, and the main bracket at the middle part has an oval plate-type main bracket 10 as shown in fig. 8.

The thickness of the locking nail holes arranged on the main support can be reduced by using the plate-type main support 10, and the insertion and sleeving of the locking nails are facilitated.

The two sides adopt cylindrical auxiliary brackets, so that the rotation and axial movement adjusting functions of the auxiliary brackets are not influenced.

Example 5: on the basis of embodiment 4, an adjusting groove 11 is formed in the middle of the main body of the plate-type main support 10 along the length direction, two inner sliding blocks 12 are sleeved in the adjusting groove 11 in a matching manner, locking nail holes 3 are respectively formed in the middle of each inner sliding block 12, and positioning rails 13 are arranged between the inner wall of the adjusting groove 11 and the two side walls of the inner sliding blocks, so that the inner sliding blocks can only move along the length direction relative to the adjusting groove and cannot fall off. The sleeve rod type auxiliary support 2 and the sleeve type main support 1 can be fixed into a whole by the locking wire 14 through the locking wire 14 which is arranged at the sleeve joint part of the sleeve rod type auxiliary support 2. The loop bar type auxiliary brackets 2 at the two ends are respectively provided with a free locking nail hole 4.

When the fixing device is applied, the two fixing nails at the inner side are firstly fixed, namely, the two locking nails are respectively installed and fixed with the locking nail holes 3, and then the other two locking nails are respectively installed and fixed with the free locking nail holes 4 of the loop bar type auxiliary support 2. And then the sleeve rod type auxiliary brackets 2 at the two ends are respectively fixed by screwing the locking wires 14 at the two ends. The embodiment can meet the requirement of bone extension, for example, when the butt joint part of two sections of fracture cannot be reset, the fracture surface is usually required to be cut off to form a plane, and the bone is lost at the fracture part, so that the length recovery after the recovery is realized by meeting the requirement of bone extension in the recovery process is required, and the embodiment can meet the requirement of realizing the bone extension function at the fracture part in the recovery process.

It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. The middle main support and the two auxiliary supports are not excluded from being sleeved by threads; it is also not excluded that corresponding locking wires are arranged on the middle main support or the auxiliary supports at the two ends, and when the external fixing frame is installed and fixed at the fracture part, the main support and the auxiliary supports are locked through the locking wires to prevent relative rotation between the main support and the auxiliary supports. It is not excluded that on the basis of example 5, only outwardly protruding column sections are provided at both ends of the panel-type main support 10, and that locking nail holes are provided in the column sections.

Claims

1. The utility model provides a universal adjustable locking external fixation frame, its characterized in that includes middle part main support and both ends auxiliary support, middle part main support on be provided with the locking nail hole that runs through respectively at its both ends to the cooperation is installed the locking nail of matching, each end auxiliary support on respectively set up a locking nail hole that runs through, and the cooperation is installed the locking nail of matching, the both ends of middle part main support respectively with both ends auxiliary support suit together, make both ends auxiliary support can rotate and/or telescopic movement along middle part main support.

2. The universal adjustable locking external fixator according to claim 1, wherein the locking nail (5) comprises a locking nail threaded section (6) with a larger upper section diameter and a self-tapping threaded section (7) with a smaller lower section diameter, the locking nail threaded section (6) is matched with a locking nail hole of the external fixator, and the self-tapping threaded section (7) is fixedly connected with a bone part.

3. The universal adjustable locking external fixator according to claim 1, comprising a cylindrical sleeve-type main bracket (1) and two cylindrical sleeve-type auxiliary brackets (2), wherein the sleeve-type auxiliary brackets (2) are symmetrically arranged at two ends of the sleeve-type main bracket (1), the diameter of the sleeve-type main bracket (1) is larger, and the diameters of the sleeve-type auxiliary brackets (2) arranged at two ends are smaller.

4. A universal adjustable locking external fixator according to claim 3, characterized in that the two ends of the sleeve-type main bracket (1) are provided with sleeves matched with the sleeve-type auxiliary brackets (2), the sleeve-type auxiliary brackets (2) are sleeved in the sleeves, and the sleeve-type auxiliary brackets (2) rotate freely along the axis of the sleeves and/or stretch out and draw back along the sleeve direction.

5. The universal adjustable locking external fixator according to claim 1, comprising a sleeve-type main support (8) in the middle and sleeve-type auxiliary supports (9) arranged at two ends, wherein the sleeve-type main support (8) adopts a solid cylindrical rod body with smaller diameter, and two ends of the cylindrical rod body are sleeved with sleeve-type auxiliary supports (9) with thicker diameter.

6. The universal adjustable locking external fixator according to claim 5, wherein the end of the sleeve-type auxiliary bracket (9) is provided with a circular cavity, and the circular cavities of the sleeve-type auxiliary bracket (9) are sleeved at two ends of the sleeve-type main bracket (8).

7. The universal adjustable locking external fixator according to claim 1, wherein the center of two end faces of the middle main support is provided with a cylindrical connecting rod, the two end auxiliary supports are provided with corresponding cylindrical cavities, and the auxiliary supports are sleeved on the middle main support through the cylindrical cavities.

8. The universal adjustable locking external fixator according to claim 1, wherein the centers of the two end faces of the middle main support are provided with cylindrical cavities, the auxiliary support is provided with corresponding cylindrical connecting rods, and the auxiliary support is sleeved on the middle main support through the connecting rods.

9. The universal adjustable locking external fixator according to claim 1, 7 or 8, wherein the middle main support is a rectangular plate main support (10), an adjusting groove (11) is formed in the middle of the main body of the plate main support (10) along the length direction, two inner sliding blocks (12) are sleeved in the adjusting groove (11) in a matching manner, locking nail holes (3) are formed in the middle of each inner sliding block (12), positioning tracks (13) are formed between the inner wall of the adjusting groove (11) and the two side walls of the inner sliding blocks, the inner sliding blocks can only move along the length direction relative to the adjusting groove and cannot fall off, locking wires (14) are arranged at sleeved positions of the auxiliary supports, and the auxiliary supports and the sleeve main support (1) are fixed into a whole through the locking wires (14).

10. The universal adjustable locking external fixator according to claim 1, 7 or 8, wherein the middle main support is a rectangular plate main support (10), an adjusting groove (11) is formed in the middle of the main body of the plate main support (10) along the length direction, two inner sliding blocks (12) are sleeved in the adjusting groove (11) in a matching manner, locking nail holes (3) are formed in the middle of each inner sliding block (12), positioning tracks (13) are formed between the inner wall of the adjusting groove (11) and the two side walls of the inner sliding blocks, the inner sliding blocks can only move along the length direction relative to the adjusting groove and cannot fall off, column sections protruding outwards are arranged at two ends of the plate main support (10), and the locking nail holes are formed in the column sections.