Heat treatment device for PDO suture production

Abstract

The utility model discloses a heat treatment device for PDO sewing thread production, and relates to the technical field of PDO sewing thread production. The device comprises a drying oven body, a supporting block is arranged in the drying oven body, two supporting columns are fixedly connected to the upper surface of the supporting block, a sliding table is arranged on the supporting block in a sliding mode, a plurality of containing mechanisms are arranged on the supporting columns and used for containing PDO stitches, and a pushing mechanism is arranged on the drying oven body. Under the action of the wheels, the supporting column, the supporting block, the sliding table and the like can move forwards, so that the sliding rail block is driven to slide to be separated from the supporting seat, at the moment, multiple discs of PDO stitches subjected to heat treatment can be far away from the oven body to be cooled, and higher efficiency and rapidness are achieved; and in the process that the two supporting columns are taken down from the PDO stitches, heat treatment of the drying oven body on the next batch of PDO stitches is not affected, so that the utilization rate of the drying oven body is increased, and the heat treatment efficiency of the PDO stitches is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to PDO suture production technical field, concretely, especially relate to a PDO suture production is with heat treatment device. BACKGROUND

[0002] Degradable suture is widely researched because of its remarkable advantages of no need to remove stitches in the wound healing process and non-toxic and harmless degradation product, and poly-p-dioxanone (PDO) is often applied to manufacturing degradable surgical suture because of its excellent biodegradability, bioabsorbability, biocompatibility, flexibility and easy processing.

[0003] During the production of degradable suture, the degradable suture needs to be heat treated, and the heat treatment has the effects of free shrinkage of suture, tighter combination between fibers, elimination of spinning stress and improvement of flexibility.

[0004] When the existing PDO suture is heat treated, the PDO suture is usually evenly laid on a high-temperature-resistant tray, and then the tray is placed in an oven for heat treatment, and usually multiple trays of PDO suture are placed in the oven. After the PDO suture is heat treated, the PDO suture needs to be naturally cooled, the tray needs to be taken out to cool the PDO suture, and it is relatively cumbersome and time-consuming to take out or place the tray in the oven one tray at a time, and the utilization rate of the oven is reduced, thereby reducing the efficiency of the PDO suture heat treatment. UTILITY MODEL CONTENTS

[0005] In view of the problem that the existing PDO suture is usually evenly laid on a high-temperature-resistant tray when heat treated, and then the tray is placed in an oven for heat treatment, and usually multiple trays of PDO suture are placed in the oven, and after the PDO suture is heat treated, the PDO suture needs to be naturally cooled, the tray needs to be taken out to cool the PDO suture, and it is relatively cumbersome and time-consuming to take out or place the tray in the oven one tray at a time, and the utilization rate of the oven is reduced, thereby reducing the efficiency of the PDO suture heat treatment, the utility model provides a PDO suture production heat treatment device to overcome the above technical problems existing in the prior art.

[0006] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0007] The utility model is a kind of PDO suture production heat treatment device, including oven box body, support block is arranged in the oven box body, the upper surface of the support block is fixedly connected with two support columns, sliding table is slidably arranged on the support block;

[0008] Multiple groups of placing mechanisms are arranged on the support column, and the placing mechanism is used to place PDO suture;

[0009] The pushing mechanism is arranged on the oven box and is used to drive the placing mechanism to move into or out of the oven box, so as to facilitate the heat treatment and cooling of the PDO suture;

[0010] The sliding table is provided with a moving mechanism, so that the placing mechanism can be pushed to displace, so that the PDO suture on the placing mechanism can be pushed away from the oven box, thereby quickly cooling the PDO suture.

[0011] Further, the placing mechanism comprises two placing grooves which are arranged on the outer surfaces of the two adjacent sides of the two support columns, and a tray is slidably connected between the two placing grooves. The lower surface of the tray is provided with two limiting arc grooves, the bottom wall of the placing groove is provided with a limiting groove, and the limiting groove is slidably connected with a limiting slider.

[0012] Further, the placing mechanism further comprises two first springs, the upper surface of the limiting slider is a circular arc surface, the circular arc surface of the limiting slider extends into the placing groove through the limiting groove, the upper surface of the limiting slider is slidably connected with the lower surface of the tray, the limiting slider is matched with the limiting arc groove, the limiting slider is slidably connected with the limiting arc groove, and the two first springs are fixedly connected between the bottom wall of the limiting groove and the lower surface of the limiting slider.

[0013] Further, the pushing mechanism comprises two sliding grooves which are arranged on the bottom wall of the oven box, a first threaded rod is rotatably connected between the inner walls of the front and rear sides of the sliding groove, the rear end of the first threaded rod rotatably penetrates through the rear surface of the oven box, two motors are fixedly connected to the rear surface of the oven box, and the rotating output shafts of the motors are fixedly connected with the first threaded rod.

[0014] Further, the pushing mechanism further comprises a mounting block which is threadedly sleeved on the first threaded rod, the mounting block is slidably connected with the sliding groove, the upper surface of the mounting block is fixedly connected with a support seat in the shape of a "U", the lower surface of the support seat is slidably connected with the bottom wall of the oven box, and the lower surface of the support block is fixedly connected with two sliding rail blocks which are slidably connected with the two support seats.

[0015] Further, the moving mechanism comprises a sliding groove which is arranged on the upper surface of the support block and extends out of the lower surface of the support block, the sliding table is slidably sleeved on the support block through the sliding groove, a plurality of wheels are fixedly mounted on the lower surface of the sliding table, a support groove which extends out of the rear surface thereof is arranged on the front surface of the sliding table, and two support plates are fixedly connected between the front and rear inner walls of the sliding groove and are slidably connected with the support groove.

[0016] Further, the moving mechanism further comprises a plurality of second springs fixedly connected between the bottom wall of the support groove and the lower surface of the support plate, the front and rear two side inner walls of the sliding table are provided with first positioning grooves, the first positioning grooves extend out of the lower surface of the sliding table, the two side inner walls adjacent to the two first positioning grooves are inclined surfaces, the lower surface of the sliding table is provided with a second positioning groove, the second positioning groove is in communication with the interiors of the two first positioning grooves, and the front and rear two side inner walls of the sliding groove are rotationally connected with a bidirectional threaded rod.

[0017] The utility model has the following beneficial effects:

[0018] The utility model discloses a support column, support block and sliding table can move forward under the action of the wheel, thereby driving the sliding rail block to slide and separate from the support seat, at this time, the PDO suture of the multiple trays after heat treatment can be cooled away from the oven body, which is more efficient and fast, and the process of taking down the PDO suture of the two support columns does not affect the heat treatment of the next batch of PDO suture by the oven body, thereby improving the utilization rate of the oven body and the efficiency of the PDO suture heat treatment.

[0019] The utility model discloses a support column, support block and sliding table can move forward under the action of the wheel, thereby driving the sliding rail block to slide and separate from the support seat, at this time, the PDO suture of the multiple trays after heat treatment can be cooled away from the oven body, which is more efficient and fast, and the process of taking down the PDO suture of the two support columns does not affect the heat treatment of the next batch of PDO suture by the oven body, thereby improving the utilization rate of the oven body and the efficiency of the PDO suture heat treatment.

[0020] The utility model discloses a support column, support block and sliding table can move forward under the action of the wheel, thereby driving the sliding rail block to slide and separate from the support seat, at this time, the PDO suture of the multiple trays after heat treatment can be cooled away from the oven body, which is more efficient and fast, and the process of taking down the PDO suture of the two support columns does not affect the heat treatment of the next batch of PDO suture by the oven body, thereby improving the utilization rate of the oven body and the efficiency of the PDO suture heat treatment.

[0021] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled person in the art, other drawings can also be obtained according to these drawings without creating labor.

[0023] Figure 1 It is the whole structure schematic diagram of the utility model;

[0024] Figure 2 It is the support column and tray position schematic diagram of the utility model;

[0025] Figure 3 is a partial exploded view of the utility model;

[0026] Figure 4 is a partial sectional view of the sliding table of the utility model;

[0027] Figure 5 is a sliding-out schematic view of the support seat of the utility model;

[0028] Figure 6 is a partial structure schematic view of the utility model;

[0029] Figure 7 is a partial sectional view of the oven box body of the utility model;

[0030] Figure 8 is a sectional view of the support column of the utility model.

[0031] In the drawings, the components represented by each reference numeral are listed as follows:

[0032] 1, oven box body; 2, support block; 3, support column; 4, sliding table; 5, sliding rail block; 6, sliding groove; 7, first spring; 8, support groove; 9, support plate; 10, wheel; 11, second spring; 12, adjusting block; 13, first positioning groove; 14, second positioning groove; 15, bidirectional threaded rod; 16, limiting arc groove; 17, sliding groove; 18, first threaded rod; 19, motor; 20, mounting block; 21, support seat; 22, placing groove; 23, tray; 24, limiting sliding block; 25, limiting groove. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0034] In the description of the utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0035] Please refer to Figures 1-8The utility model discloses a PDO suture production heat treatment device, including oven box body 1, be provided with support block 2 in oven box body 1, the upper surface of support block 2 is fixedly connected with two support columns 3, the sliding table 4 of being provided with on support block 2,

[0036] The support column 3 is provided with multiple groups of placing mechanisms, and the placing mechanisms are used for placing PDO sutures.

[0037] The oven box body 1 is provided with a pushing mechanism, the pushing mechanism is used to drive the placing mechanism to move into or move out of the oven box body 1, so as to facilitate the heat treatment and cooling of the PDO suture.

[0038] The sliding table 4 is provided with a moving mechanism, so that the placing mechanism can be pushed to displace, so that the PDO suture on the placing mechanism can be pushed away from the oven box body 1, and the PDO suture can be quickly cooled.

[0039] In one embodiment, for the upper placing mechanism, the placing mechanism includes two placing grooves 22, two placing grooves 22 are opened on the outer surfaces of two adjacent support columns 3, a tray 23 is slidably connected between the two placing grooves 22, two limiting arc grooves 16 are opened on the lower surface of the tray 23, a limiting groove 25 is opened on the bottom wall of the placing groove 22, and a limiting slide block 24 is slidably connected in the limiting groove 25.

[0040] The placing mechanism further includes two first springs 7, the upper surface of the limiting slide block 24 is a circular arc surface, the circular arc surface of the limiting slide block 24 extends into the placing groove 22 through the limiting groove 25, the upper surface of the limiting slide block 24 is slidably connected with the lower surface of the tray 23, the limiting slide block 24 is adapted to the limiting arc groove 16, the limiting slide block 24 is slidably connected with the limiting arc groove 16, and the two first springs 7 are fixedly connected between the bottom wall of the limiting groove 25 and the lower surface of the limiting slide block 24.

[0041] In the scheme, one oven body 1 can be equipped with a plurality of support blocks 2, and the support blocks 2 are each provided with a moving mechanism and a placing mechanism; in use, PDO sutures are placed in the tray 23, and then the tray 23 is slid into the placing groove 22 between the left and right sides, because the upper surface of the limiting sliding block 24 extends into the placing groove 22, when the tray 23 is slid into the placing groove 22, the tray 23 is in contact with the upper surface of the limiting sliding block 24 and pushes the limiting sliding block 24 to move downward into the limiting groove 25, so that the limiting sliding block 24 synchronously extrudes the first spring 7 to cause the first spring 7 to be extruded and deformed, when the tray 23 is slid in the placing groove 22 to the limiting arc groove 16 on the tray 23 and the corresponding limiting groove 25 are matched, the limiting sliding block 24 is slid into the limiting arc groove 16 under the action of the release force of the first spring 7, so that the upper surface of the limiting sliding block 24 is attached to the inner wall of the limiting arc groove 16, and the limiting sliding block 24 is slid into the limiting arc groove 16 to limit the tray 23, so as to avoid the tray 23 from sliding out of the placing groove 22 without external force, thereby ensuring the stability and safety of the PDO sutures in the tray 23;

[0042] The tray 23 is pulled out, so that the tray 23 is slid forward out of the placing groove 22, in this process, the limiting arc groove 16 is moved forward, so that the limiting sliding block 24 is slid out of the limiting arc groove 16, the tray 23 is disassembled and pulled out between the two support columns 3, thereby facilitating the cleaning of the tray 23 and the taking out of the PDO sutures, and being more convenient and flexible.

[0043] In one embodiment, for the pushing mechanism, the pushing mechanism comprises two sliding grooves 17, the sliding grooves 17 are provided on the bottom wall of the oven body 1, the first threaded rod 18 is rotatably connected between the inner walls of the front and rear sides of the sliding groove 17, the rear end of the first threaded rod 18 is rotatably penetrated out of the rear surface of the oven body 1, the rear surface of the oven body 1 is fixedly connected with two motors 19, and the rotating output shaft of the motor 19 is fixedly connected with the first threaded rod 18;

[0044] The pushing mechanism further comprises an installation block 20, the installation block 20 is threadedly sleeved on the first threaded rod 18, the installation block 20 is slidably connected with the sliding groove 17, the upper surface of the installation block 20 is fixedly connected with a support seat 21 in the shape of "U", the lower surface of the support seat 21 is slidably connected with the bottom wall of the oven body 1, and the lower surface of the support block 2 is fixedly connected with two sliding rail blocks 5, and the two sliding rail blocks 5 are slidably connected with the two support seats 21.

[0045] In addition, in a specific application, in the initial state, the slide rail block 5 is located in the support seat 21, and the slide rail block 5 and the support seat 21 are located in the oven box body 1, the PDO suture is placed in the tray 23, and the tray 23 is placed in the oven box body 1 to heat treat the PDO suture, at this time, the lower surface of the slide rail block 5 is in close contact with the bottom wall of the support seat 21;

[0046] The starting motor 19 can drive the first threaded rod 18 to rotate, and the rotation of the first threaded rod 18 can drive the mounting block 20 connected with it by threads to move forward and backward, so as to drive the support seat 21 to move forward and backward. When the support seat 21 moves forward and extends out of the oven box body 1, it can simultaneously drive the slide rail block 5 to displace out of the oven box body 1, so as to drive the support columns 3 fixed on the support block 2 and on the support block 2 to be located in the oven box body 1, so that the plurality of trays 23 placed between the two support columns 3 can be simultaneously displaced out of the oven box body 1, thereby accelerating the cooling of the heat-treated PDO suture in the tray 23, and further improving the efficiency of the PDO suture heat treatment.

[0047] In one embodiment, for the upward moving mechanism, the moving mechanism comprises a sliding groove 6, the sliding groove 6 is opened in the upper surface of the support block 2 and extends out of the lower surface of the support block 2, the sliding table 4 is sleeved on the support block 2 through the sliding groove 6, the lower surface of the sliding table 4 is fixedly installed with a plurality of wheels 10, the front surface of the sliding table 4 is provided with a support groove 8 extending out of the rear surface thereof, two support plates 9 are fixedly connected between the front and rear inner walls of the sliding groove 6, and the support plates 9 are slidably connected with the support groove 8;

[0048] The moving mechanism further comprises a plurality of second springs 11, the plurality of second springs 11 are fixedly connected between the bottom wall of the support groove 8 and the lower surface of the support plate 9, the front and rear inner walls of the sliding table 4 are both provided with a first positioning groove 13, the first positioning groove 13 extends out of the lower surface of the sliding table 4, the two adjacent side inner walls of the first positioning groove 13 are inclined surfaces, the lower surface of the sliding table 4 is provided with a second positioning groove 14, the second positioning groove 14 is in communication with the interiors of the two first positioning grooves 13, a bidirectional threaded rod 15 is rotatably connected between the front and rear inner walls of the sliding groove 6, two adjusting blocks 12 are threadedly sleeved on the outer surface of the bidirectional threaded rod 15, the adjusting blocks 12 are slidably connected with the first positioning grooves 13, and the bidirectional threaded rod 15 slides through the second positioning groove 14.

[0049] Furthermore, in specific applications, the bidirectional threaded rod 15 is rotated to drive the two adjusting blocks 12 connected thereto to move in opposite directions or away from each other. When the two adjusting blocks 12 move away from each other, the adjusting blocks 12 are in contact with the inclined surface of the second positioning groove 14 and slide along the inclined surface of the second positioning groove 14 as the two adjusting blocks 12 move away from each other, so as to drive the sliding table 4 to move upward. During the upward movement of the sliding table 4, the bottom wall of the supporting groove 8 is pressed against the second spring 11, causing the second spring 11 to deform and compress. During the upward movement of the sliding table 4, the wheels 10 move upward, so that the wheels 10 come into contact with the ground to support the supporting block 2, and then drive the supporting block 2 to move upward. The upward movement of the supporting block 2 causes the lower surface of the sliding rail block 5 to disengage from the bottom wall of the supporting seat 21. At this time, the supporting column 3 is pushed, and under the action of the wheels 10, the supporting column 3, the supporting block 2, and the sliding table 4 can move forward, thereby driving the sliding rail block 5 to slide out of the supporting seat 21. At this time, the PDO sutures in multiple trays after heat treatment can be cooled away from the oven body 1, which is more efficient and faster. Moreover, the PDO sutures do not affect the heat treatment of the next batch of PDO sutures in the oven body 1 during the process of removing the two supporting columns 3, thereby improving the utilization rate of the oven body 1 and the efficiency of the PDO suture heat treatment.

[0050] Through the above technical solution, 1, by the action of the wheels 10, the supporting column 3, the supporting block 2, and the sliding table 4 can move forward, thereby driving the sliding rail block 5 to slide out of the supporting seat 21. At this time, the PDO sutures in multiple trays after heat treatment can be cooled away from the oven body 1, which is more efficient and faster. Moreover, the PDO sutures do not affect the heat treatment of the next batch of PDO sutures in the oven body 1 during the process of removing the two supporting columns 3, thereby improving the utilization rate of the oven body 1 and the efficiency of the PDO suture heat treatment.

[0051] Through the above technical solution, 1, by the action of the wheels 10, the supporting column 3, the supporting block 2, and the sliding table 4 can move forward, thereby driving the sliding rail block 5 to slide out of the supporting seat 21. At this time, the PDO sutures in multiple trays after heat treatment can be cooled away from the oven body 1, which is more efficient and faster. Moreover, the PDO sutures do not affect the heat treatment of the next batch of PDO sutures in the oven body 1 during the process of removing the two supporting columns 3, thereby improving the utilization rate of the oven body 1 and the efficiency of the PDO suture heat treatment.

[0052] Through the above technical solution, 1, by the action of the wheels 10, the supporting column 3, the supporting block 2, and the sliding table 4 can move forward, thereby driving the sliding rail block 5 to slide out of the supporting seat 21. At this time, the PDO sutures in multiple trays after heat treatment can be cooled away from the oven body 1, which is more efficient and faster. Moreover, the PDO sutures do not affect the heat treatment of the next batch of PDO sutures in the oven body 1 during the process of removing the two supporting columns 3, thereby improving the utilization rate of the oven body 1 and the efficiency of the PDO suture heat treatment.

[0053] In the description of the application, references to "one embodiment", "an example", "certain examples" etc. mean that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "an example" or "certain examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0054] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all of the details of the application, nor limit the application to the specific embodiments described. Obviously, many modifications and variations of the application can be made in light of the teachings above. The embodiments are chosen and described in order to best explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application. The application is merely exemplary and limited by the scope of the appended claims as well as the equivalents thereof.

Claims

1. A heat treatment apparatus for PDO suture production, comprising an oven body (1), characterized in that, The oven body (1) is provided with a support block (2), and two support columns (3) are fixedly connected to the upper surface of the support block (2). A sliding table (4) is slidably provided on the support block (2). The support column (3) is provided with multiple sets of placement mechanisms, which are used to place PDO sutures; The oven body (1) is provided with a pushing mechanism, which is used to drive the placement mechanism to move into or out of the oven body (1) so as to facilitate the heat treatment and cooling of PDO sewing thread; The sliding table (4) is provided with a moving mechanism so that the placement mechanism can be pushed and displaced, thereby pushing the PDO suture on the placement mechanism away from the oven body (1) to quickly cool the PDO suture.

2. The heat treatment apparatus for PDO suture production according to claim 1, characterized in that, The placement mechanism includes two placement slots (22), which are opened on the outer surfaces of the two adjacent support columns (3). A tray (23) is slidably connected between the two placement slots (22). Two limiting arc grooves (16) are opened on the lower surface of the tray (23). A limiting groove (25) is opened on the bottom wall of the placement slot (22). A limiting slider (24) is slidably connected in the limiting groove (25).

3. The heat treatment apparatus for PDO suture production according to claim 2, characterized in that, The placement mechanism also includes two first springs (7). The upper surface of the limiting slider (24) is an arc surface. The arc surface of the limiting slider (24) extends into the placement groove (22) through the limiting groove (25). The upper surface of the limiting slider (24) is slidably connected to the lower surface of the tray (23). The limiting slider (24) is adapted to the limiting arc groove (16). The limiting slider (24) is slidably connected to the limiting arc groove (16). The two first springs (7) are fixedly connected between the bottom wall of the limiting groove (25) and the lower surface of the limiting slider (24).

4. The heat treatment apparatus for PDO suture production according to claim 1, characterized in that, The pushing mechanism includes two slides (17), which are formed on the bottom wall of the oven body (1). A first threaded rod (18) is rotatably connected between the inner walls of the front and rear sides of the slides (17). The rear end of the first threaded rod (18) rotatably passes through the rear surface of the oven body (1). Two motors (19) are fixedly connected to the rear surface of the oven body (1). The rotation output shaft of the motors (19) is fixedly connected to the first threaded rod (18).

5. The heat treatment apparatus for PDO suture production according to claim 4, characterized in that, The pushing mechanism also includes a mounting block (20), which is threaded onto the first threaded rod (18). The mounting block (20) is slidably connected to the slide groove (17). A U-shaped support seat (21) is fixedly connected to the upper surface of the mounting block (20). The lower surface of the support seat (21) is slidably connected to the bottom wall of the oven body (1). Two slide rail blocks (5) are fixedly connected to the lower surface of the support block (2), and the two slide rail blocks (5) are slidably connected to the two support seats (21).

6. The heat treatment apparatus for PDO suture production according to claim 1, characterized in that, The moving mechanism includes a sliding groove (6), which is formed on the upper surface of the support block (2) and extends out of the lower surface of the support block (2). The sliding table (4) is slidably mounted on the support block (2) through the sliding groove (6). Multiple wheels (10) are fixedly installed on the lower surface of the sliding table (4). A support groove (8) extending out of the rear surface of the front side of the sliding table (4) is formed. Two support plates (9) are fixedly connected between the front and rear inner walls of the sliding groove (6). The support plates (9) are slidably connected to the support groove (8).

7. The heat treatment apparatus for PDO suture production according to claim 6, characterized in that, The moving mechanism also includes a plurality of second springs (11), which are fixedly connected between the bottom wall of the support groove (8) and the lower surface of the support plate (9). The inner walls of the front and rear sides of the sliding table (4) are provided with first positioning grooves (13), which extend out of the lower surface of the sliding table (4). The inner walls of the two adjacent first positioning grooves (13) are inclined. The lower surface of the sliding table (4) is provided with second positioning grooves (14), which communicate with the interior of the two first positioning grooves (13). A bidirectional threaded rod (15) is rotatably connected between the inner walls of the front and rear sides of the sliding groove (6). Two adjusting blocks (12) are threaded on the outer surface of the bidirectional threaded rod (15). The adjusting blocks (12) are slidably connected to the first positioning groove (13), and the bidirectional threaded rod (15) slides through the second positioning groove (14).

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