Stretching film packaging machine with positioning structure

Abstract

The utility model relates to the technical field of stretch film packaging machines, in particular to a stretch film packaging machine with a positioning structure. Comprising a mounting table, a packaging box film releasing mechanism is arranged on one side of the mounting table, a packaging box film roll is arranged on the packaging box film releasing mechanism, a packaging box pressing mechanism is arranged at the top of the mounting table, a first U-shaped support is fixedly mounted at the top of the mounting table, and a food putting mechanism is arranged on the first U-shaped support; a stretching film releasing mechanism is arranged at the top of the mounting table, a stretching film roll is arranged on the stretching film releasing mechanism, a heat sealing mechanism and a cutting mechanism are arranged at the top of the mounting table, and a plurality of partition plates are fixedly mounted at the top of the mounting table. By means of the simple positioning structure, the packaging box can be conveniently and rapidly positioned, feeding is facilitated, meanwhile, a packaging box film can be conveniently pulled, a large number of packaging boxes can be conveniently and rapidly pressed, food can be conveniently and rapidly filled, and the food packaging efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stretch film packaging machines, in particular to a stretch film packaging machine with a positioning structure. Background Art

[0002] With the continuous development of the economy, the market demand for stretch film packaging machines continues to increase. Stretch film, also known as winding film packaging film, is a transparent and elastic polyethylene plastic film used for covering packaging of uncovered packaging boxes, mainly used in the field of food packaging. Existing stretch film packaging machines generally include manual and mechanical drive methods for stretching the film, which brings great convenience to food packaging work. The prior art discloses a stretch film packaging machine with a positioning structure with an authorization announcement number of CN117163360B, which relates to the technical field of packaging equipment, including: an installation mechanism, when in use, adjusts the starting position of the sliding plate to move after the film is coated, and changes the sliding plate by changing the sliding plate. The starting position of the plate movement can play a role in adjusting the flipping timing of the flip rod, so that the stretch film at the end of the packaging boxes of different sizes can be cut off at the rear side of the plug-in board. In this way, the stretch film on the packaging box can be cut off immediately after the packaging box is covered, thereby preventing the waste of the stretch film and solving the problem of waste in the covering method of the stretch film. Since the amount of stretch film used for packaging items of different sizes is different, when the stretch film is used to cover the goods, an excessive amount of stretch film is often used, which not only causes a waste of the stretch film, but also pollutes the environment due to excessive use of the stretch film.

[0003] However, it was found during use that the packaging box positioning structure of the above design is not convenient for driving the packaging box to move, resulting in inconvenience in pulling out the packaging box film, inconvenience in quickly and massively pressing the packaging boxes and filling food, which seriously affects the packaging efficiency of food. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a stretch film packaging machine with a positioning structure, which is convenient for quickly positioning the packaging box, feeding the materials, pulling the packaging box film, and quickly and massively pressing the packaging boxes and filling the food, thereby effectively improving the packaging efficiency of the food and solving the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the utility model adopts the following technical solution: a stretch film packaging machine with a positioning structure, comprising a mounting platform, a packaging box film releasing mechanism is provided on one side of the mounting platform, a packaging box film roll is provided on the packaging box film releasing mechanism, a packaging box pressing mechanism is provided on the top of the mounting platform, a first U-shaped bracket is fixedly installed on the top of the mounting platform, a food delivery mechanism is provided on the first U-shaped bracket, a stretch film releasing mechanism is provided on the top of the mounting platform, a stretch film roll is provided on the stretch film releasing mechanism, a heat sealing mechanism and a cutting mechanism are provided on the top of the mounting platform, a plurality of partitions are fixedly installed on the top of the mounting platform, the packaging box film of the packaging box film roll slides and covers the tops of the plurality of partitions, two positioning rollers are rotatably installed in the first U-shaped bracket, the positioning rollers are adapted to the plurality of partitions, one end of the positioning roller extends to the outside of the first U-shaped bracket and is fixedly sleeved with a first gear, a motor is provided on one side of the first U-shaped bracket, a second gear is provided on the output shaft of the motor, and the second gear is meshed with both the two first gears.

[0006] To facilitate quick production of food packaging boxes:

[0007] As a further improvement of the above technical solution: the packaging box pressing mechanism also includes an installation box with an open top, a lower hot pressing template, multiple packaging box forming cavities, four vertical rods, a horizontal plate, an upper hot pressing template and multiple electric cylinders, the installation box is fixed on the top inner wall of the mounting table, the lower hot pressing template is slidably installed in the installation box, the top surface of the lower hot pressing template extends outside the mounting table, the packaging box forming cavity is opened at the top of the lower hot pressing template, the four vertical rods are fixed on the top of the lower hot pressing template, the horizontal plate is fixed on the top of the four vertical rods, the four vertical rods slide through the upper hot pressing template, the electric cylinder is fixed on the top of the horizontal plate, and the output rod of the electric cylinder slides through the horizontal plate and is fixed on the top of the upper hot pressing template.

[0008] The beneficial effect of this improvement is that, through such an arrangement, it is convenient to perform hot pressing forming on the packaging box film, thereby facilitating the rapid production of food packaging boxes.

[0009] In order to facilitate the replacement of the packaging box pressing mechanism to press different packaging boxes:

[0010] As a further improvement of the above technical solution: the installation box also includes four circular holes, which are opened on the inner wall of the corresponding side of the installation box, and a clamping rod slides through the circular hole. A chamber is opened on the lower hot pressing template, and two slides are slidably installed in the chamber. One end of the clamping rod extends into the chamber and is fixed on the slide. The same bidirectional screw rod is threaded through the two slides, and a first bevel gear is fixedly sleeved on the bidirectional screw rod. A rotating rod is rotatably installed at the bottom of the lower hot pressing template, and the top of the rotating rod extends into the chamber and is provided with a second bevel gear, and the second bevel gear is meshed with the first bevel gear.

[0011] The beneficial effect of this improvement is that, through such an arrangement, it is convenient to assemble and disassemble the packaging box pressing mechanism, and then it is convenient to replace the packaging box pressing mechanism, thereby facilitating the pressing of different packaging boxes and facilitating the packaging of different foods.

[0012] In order to facilitate ejection of the formed packaging box from the forming cavity:

[0013] As a further improvement of the above technical solution: a first groove is provided on the bottom inner wall of the packaging box forming cavity, a second groove is provided on the bottom inner wall of the first groove, a discharge ejector rod is provided in the packaging box forming cavity, the discharge ejector rod is slidably connected to the inner walls of the first groove and the second groove, an installation chamber is provided on the inner walls on both sides of the second groove, a slider and a spring are slidably installed in the installation chamber, one end of the slider is fixed on the corresponding discharge ejector rod, and the top end of the spring is in contact with the corresponding slider.

[0014] The beneficial effect of this improvement is that, through such an arrangement, it is convenient to eject the formed packaging box from the forming cavity.

[0015] To facilitate the installation of the hot pressing template:

[0016] As a further improvement of the above technical solution: a rectangular through hole is penetrated through the top of the mounting platform, the rectangular through hole is communicated with the mounting box, and the lower hot pressing template slides through the rectangular through hole.

[0017] The beneficial effect of this improvement is that by providing a rectangular through hole, it is convenient to install the lower hot pressing template.

[0018] To facilitate the installation of the motor:

[0019] As a further improvement of the above technical solution: two first through holes are penetrated on the inner walls on both sides of the first U-shaped bracket, the positioning roller rotates through the corresponding two first through holes, a second U-shaped bracket is provided on one side of the first U-shaped bracket, and the motor is fixed on the second U-shaped bracket.

[0020] The beneficial effect of this improvement is that by providing the second U-shaped bracket, it is convenient to install and fix the motor.

[0021] To facilitate turning the lever:

[0022] As a further improvement of the above technical solution: two second through holes are penetrated on the inner walls on both sides of the chamber, the card rod slides through the corresponding second through holes, a first operating port is opened on the bottom inner wall of the installation box, and a second operating port is opened on the inner wall on one side of the installation platform, and the first operating port and the second operating port are both adapted to the rotating rod.

[0023] The beneficial effect of this improvement is that by providing the first operating opening and the second operating opening, it is convenient to rotate the rotating rod.

[0024] In order to facilitate the support and limit of the bidirectional screw:

[0025] As a further improvement of the above technical solution: two clamping plates are fixedly installed in the chamber, and the bidirectional screw rod rotates and passes through the two clamping plates.

[0026] The beneficial effect of this improvement is that by providing a clamping plate, it is convenient to support and limit the bidirectional screw rod.

[0027] The beneficial effects of the utility model are as follows: through a simple positioning structure, the packaging box can be quickly positioned, thereby facilitating feeding, and at the same time facilitating pulling the packaging box film, facilitating rapid and large-scale pressing of the packaging box and filling of food, thereby effectively improving the packaging efficiency of food. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0029] Figure 2 For this utility model Figure 1 A schematic diagram of the enlarged structure of part A;

[0030] Figure 3 It is a schematic diagram of a cross-sectional structure of a first U-shaped bracket in the utility model when viewed from the bottom;

[0031] Figure 4 For this utility model Figure 2 A schematic diagram of the enlarged structure of part B;

[0032] Figure 5 It is a schematic diagram of the three-dimensional assembly structure of the slide plate and the clamping rod in the utility model.

[0033] In the figure: 1, mounting table; 2, packaging box film release mechanism; 3, packaging box film roll; 4, packaging box pressing mechanism; 401, mounting box; 402, lower hot pressing template; 403, packaging box forming cavity; 404, vertical rod; 405, horizontal plate; 406, upper hot pressing template; 407, electric cylinder; 411, round hole; 412, clamping rod; 413, chamber; 414, slide plate; 415, bidirectional screw rod; 416, first bevel gear; 417 , rotating rod; 418, second bevel gear; 421, first groove; 422, second groove; 423, discharge push rod; 424, installation chamber; 425, slider; 426, spring; 5, first U-shaped bracket; 6, food delivery mechanism; 7, stretch film release mechanism; 8, stretch film roll; 9, heat sealing mechanism; 10, cutting mechanism; 11, partition; 12, positioning roller; 13, first gear; 14, motor; 15, second gear. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the utility model.

[0035] like Figure 1-5As shown, a stretch film packaging machine with a positioning structure comprises a mounting platform 1, a packaging box film releasing mechanism 2 is provided on one side of the mounting platform 1, a packaging box film roll 3 is provided on the packaging box film releasing mechanism 2, a packaging box pressing mechanism 4 is provided on the top of the mounting platform 1, a first U-shaped bracket 5 is fixedly installed on the top of the mounting platform 1, a food placing mechanism 6 is provided on the first U-shaped bracket 5, a stretch film releasing mechanism 7 is provided on the top of the mounting platform 1, a stretch film roll 8 is provided on the stretch film releasing mechanism 7, a heat sealing mechanism 9 and a cutting mechanism 10 are provided on the top of the mounting platform 1, a plurality of partitions 11 are fixedly installed on the top of the mounting platform 1, the packaging box film of the packaging box film roll 3 slides and covers the top of the plurality of partitions 11, and the first U-shaped Two positioning rollers 12 are rotatably installed in the bracket 5, and the positioning rollers 12 are adapted to multiple partitions 11. One end of the positioning roller 12 extends to the outside of the first U-shaped bracket 5 and is fixedly sleeved with a first gear 13. A motor 14 is provided on one side of the first U-shaped bracket 5. A second gear 15 is provided on the output shaft of the motor 14. The second gear 15 is meshed with the two first gears 13. Through a simple positioning structure, it is convenient to quickly position the packaging box, thereby facilitating feeding, and at the same time facilitating the pulling of the packaging box film, facilitating rapid and large-scale pressing of packaging boxes and filling of food, and effectively improving the packaging efficiency of food. The packaging box pressing mechanism 4 also includes a mounting box 401 with an opening at the top, a lower hot pressing template 402, and multiple packaging box forming The packaging box molding cavity 403 comprises a plurality of vertical rods 404, a horizontal plate 405, an upper hot pressing template 406 and a plurality of electric cylinders 407. The mounting box 401 is fixed on the top inner wall of the mounting platform 1. The lower hot pressing template 402 is slidably mounted in the mounting box 401. The top surface of the lower hot pressing template 402 extends to the outside of the mounting platform 1. The packaging box molding cavity 403 is opened at the top of the lower hot pressing template 402. The four vertical rods 404 are all fixed on the top of the lower hot pressing template 402. The horizontal plate 405 is fixed on the top of the four vertical rods 404. The four vertical rods 404 are all slidably penetrated through the upper hot pressing template 406. The electric cylinder 407 is fixed on the top of the horizontal plate 405. The output rod of the electric cylinder 407 slides through the horizontal plate 405 and is fixed to the upper hot pressing template 406. The top of the packaging box is arranged in this way, so that it is convenient to perform hot pressing molding on the packaging box film, and then it is convenient to quickly make food packaging boxes. The installation box 401 also includes four circular holes 411, and the circular holes 411 are opened on the inner wall of the corresponding side of the installation box 401. A clamping rod 412 is slidably penetrated in the circular holes 411. A chamber 413 is opened on the lower hot pressing template 402, and two slide plates 414 are slidably installed in the chamber 413. One end of the clamping rod 412 extends into the chamber 413 and is fixed on the slide plate 414. The two slide plates 414 are threaded with the same bidirectional screw rod 415, and the bidirectional screw rod 415 is fixedly sleeved with a first bevel gear 416. The bottom of the lower hot pressing template 402 is rotatably installed with a rotating rod 417.The top end of the rotating rod 417 extends into the chamber 413 and is provided with a second bevel gear 418, and the second bevel gear 418 is meshed with the first bevel gear 416. By such an arrangement, it is convenient to assemble and disassemble the packaging box pressing mechanism 4, and then it is convenient to replace the packaging box pressing mechanism 4, so as to press different packaging boxes and package different foods. A first groove 421 is provided on the bottom inner wall of the packaging box forming cavity 403, and a second groove 422 is provided on the bottom inner wall of the first groove 421. The ejector rod 423 is slidably connected to the inner walls of the first groove 421 and the second groove 422. The inner walls of both sides of the second groove 422 are provided with mounting chambers 424. A slider 425 and a spring 426 are slidably mounted in the mounting chamber 424. One end of the slider 425 is fixed to the corresponding ejector rod 423. The top of the spring 426 is in contact with the corresponding slider 425. This arrangement facilitates ejecting the formed packaging box from the forming cavity 403. A rectangular through hole is passed through the top of the mounting platform 1. The rectangular through hole is connected to the installation box 401, and the lower hot pressing template 402 slides through the rectangular through hole. By setting the rectangular through hole, it is convenient to install the lower hot pressing template 402. The inner walls on both sides of the first U-shaped bracket 5 are penetrated with two first through holes. The positioning roller 12 rotates and penetrates the corresponding two first through holes. A second U-shaped bracket is provided on one side of the first U-shaped bracket 5. The motor 14 is fixed on the second U-shaped bracket. By setting the second U-shaped bracket, it is convenient to install and fix the motor 14. The inner walls on both sides of the chamber 413 are penetrated There are two second through holes, the clamp rod 412 slides through the corresponding second through holes, a first operating port is provided on the bottom inner wall of the installation box 401, and a second operating port is provided on the inner wall of one side of the installation platform 1, the first operating port and the second operating port are both adapted to the rotating rod 417, and the first operating port and the second operating port are provided to facilitate the rotation of the rotating rod 417, two clamp plates are fixedly installed in the chamber 413, the bidirectional screw rod 415 rotates through the two clamp plates, and the clamp plates are provided to facilitate the support and position limiting of the bidirectional screw rod 415.

[0036] The working principle of the utility model is as follows: when in use, first install the packaging box film roll on the packaging box film release mechanism 2, then draw out the packaging box film and place it on the top of multiple partitions 11, then push the packaging box film so that the packaging box film slides on the multiple partitions 11 until the two positioning rollers 12 are pressed on the packaging box film, then open multiple electric cylinders 407, and the output rods of the electric cylinders 407 drive the upper hot pressing template 406 to slide and descend on the four vertical rods 404 until the packaging box film is pressed on the lower hot pressing template 402, and the packaging box film is pressed into multiple packaging boxes with open tops, the discharge push rod 423 is pressed down, the spring 426 is compressed, and then the upper hot pressing template 406 is lifted, and multiple The ejector rod 423 is lifted up by the spring 426 to eject the packaging box in the packaging box forming cavity 403, and then the motor 14 is turned on. The output shaft of the motor 14 drives the second gear 15 to rotate, and the second gear 15 drives the two first gears 13 to rotate in the same direction, so that the two positioning rollers 12 are driven to rotate in the same direction. While the positioning rollers 12 rotate, the packaging box film is driven to move laterally, so that the pressed packaging box is pulled to move laterally, and the formed packaging box enters between the corresponding two partitions 11. The packaging box is driven by the positioning rollers 12 to move to a suitable position below the first U-shaped bracket 5 and stops. The food delivery mechanism 6 is opened to discharge multiple packaging boxes. Then the positioning rollers 12 drive the packaging box film to move laterally. The box packing continues to move, and the stretch film releasing mechanism 7 lays the stretch film on the packaging box containing the food. The packaging box continues to move, and the heat sealing mechanism 9 is opened to heat-press the stretch film onto multiple packaging boxes, so that the packaging boxes are sealed. Then the cutting mechanism 10 is opened to cut and separate the multiple packaging boxes that are connected and sealed. Through this arrangement, it is convenient to quickly position the packaging box, so as to facilitate feeding, and at the same time, it is convenient to pull the packaging box film, so as to quickly and massively press the packaging boxes and fill the food, which effectively improves the packaging efficiency of the food. When it is necessary to press different types of packaging boxes, first rotate the rotating rod 417 through the first operating port and the second operating port, and the rotating rod 417 with The second bevel gear 418 is driven to rotate, and the second bevel gear 418 drives the first bevel gear 416 to rotate. The first bevel gear 416 drives the bidirectional screw rod 415 to rotate, and the bidirectional screw rod 415 drives the two slide plates 414 to slide, so that the clamping rod 412 is driven to slide out of the corresponding circular hole 411, so that the fixation of the lower hot pressing template 402 is released, and then the horizontal plate 405 is pulled upward to remove the packaging box pressing mechanism 4, and then the required packaging box pressing mechanism 4 can be replaced. Through such a configuration, it is convenient to assemble and disassemble the packaging box pressing mechanism 4, and then it is convenient to replace the packaging box pressing mechanism 4, so that it is convenient to press different packaging boxes and package different foods.

[0037] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0038] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. The above is only the preferred implementation method of the utility model. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principle of the utility model, they can make several improvements, embellishments or changes, and can also combine the above technical features in an appropriate manner; these improvements, embellishments, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the utility model.

Claims

1. A stretch film packaging machine with a positioning structure, comprising a mounting table (1), characterized in that: A packaging box film release mechanism (2) is provided on one side of the mounting platform (1), a packaging box film roll (3) is provided on the packaging box film release mechanism (2), a packaging box pressing mechanism (4) is provided on the top of the mounting platform (1), a first U-shaped bracket (5) is fixedly installed on the top of the mounting platform (1), a food delivery mechanism (6) is provided on the first U-shaped bracket (5), a stretch film release mechanism (7) is provided on the top of the mounting platform (1), a stretch film roll (8) is provided on the stretch film release mechanism (7), a heat sealing mechanism (9) and a cutting mechanism (10) are provided on the top of the mounting platform (1), and the mounting platform (1) A plurality of partitions (11) are fixedly installed on the top of the packaging box, and the packaging box film of the packaging box film roll (3) slides and covers the top of the plurality of partitions (11). Two positioning rollers (12) are rotatably installed in the first U-shaped bracket (5), and the positioning rollers (12) are adapted to the plurality of partitions (11). One end of the positioning roller (12) extends to the outside of the first U-shaped bracket (5) and is fixedly sleeved with a first gear (13). A motor (14) is provided on one side of the first U-shaped bracket (5), and a second gear (15) is provided on the output shaft of the motor (14), and the second gear (15) is meshed with the two first gears (13).

2. The stretch film packaging machine with a positioning structure according to claim 1, characterized in that: The packaging box pressing mechanism (4) further comprises a mounting box (401) with an opening at the top, a lower hot pressing template (402), a plurality of packaging box forming cavities (403), four vertical rods (404), a horizontal plate (405), an upper hot pressing template (406) and a plurality of electric cylinders (407), wherein the mounting box (401) is fixed on the top inner wall of the mounting platform (1), the lower hot pressing template (402) is slidably mounted in the mounting box (401), and the top surface of the lower hot pressing template (402) extends to the outside of the mounting platform (1), The packaging box forming cavity (403) is opened at the top of the lower hot pressing template (402), the four vertical rods (404) are fixed on the top of the lower hot pressing template (402), the horizontal plate (405) is fixed on the top of the four vertical rods (404), the four vertical rods (404) are slid through the upper hot pressing template (406), the electric cylinder (407) is fixed on the top of the horizontal plate (405), and the output rod of the electric cylinder (407) is slid through the horizontal plate (405) and fixed on the top of the upper hot pressing template (406).

3. The stretch film packaging machine with a positioning structure according to claim 2, characterized in that: The installation box (401) further comprises four circular holes (411), wherein the circular holes (411) are provided on the inner wall of the corresponding side of the installation box (401), wherein a clamping rod (412) is slidably penetrated in the circular holes (411), wherein a chamber (413) is provided on the lower hot pressing template (402), wherein two slide plates (414) are slidably installed in the chamber (413), wherein one end of the clamping rod (412) extends into the chamber (413) and is fixed on the slide plate ( 414), the two slide plates (414) are threaded with a same bidirectional screw rod (415), the bidirectional screw rod (415) is fixedly sleeved with a first bevel gear (416), the bottom of the lower hot pressing template (402) is rotatably mounted with a rotating rod (417), the top end of the rotating rod (417) extends into the chamber (413) and is provided with a second bevel gear (418), and the second bevel gear (418) is meshed with the first bevel gear (416).

4. The stretch film packaging machine with a positioning structure according to claim 2, characterized in that: A first groove (421) is provided on the inner wall at the bottom of the packaging box forming cavity (403), a second groove (422) is provided on the inner wall at the bottom of the first groove (421), a discharge ejector rod (423) is provided in the packaging box forming cavity (403), the discharge ejector rod (423) is slidably connected to the inner walls of the first groove (421) and the second groove (422), an installation chamber (424) is provided on the inner walls on both sides of the second groove (422), a slider (425) and a spring (426) are slidably installed in the installation chamber (424), one end of the slider (425) is fixed on the corresponding discharge ejector rod (423), and the top end of the spring (426) is in contact with the corresponding slider (425).

5. The stretch film packaging machine with a positioning structure according to claim 2, characterized in that: A rectangular through hole is formed on the top of the mounting platform (1), the rectangular through hole is connected to the mounting box (401), and the lower hot pressing template (402) slides through the rectangular through hole.

6. The stretch film packaging machine with a positioning structure according to claim 1, characterized in that: Two first through holes are penetrated on the inner walls on both sides of the first U-shaped bracket (5); the positioning roller (12) rotates and penetrates the corresponding two first through holes; a second U-shaped bracket is provided on one side of the first U-shaped bracket (5); and the motor (14) is fixed on the second U-shaped bracket.

7. The stretch film packaging machine with a positioning structure according to claim 3, characterized in that: Two second through holes are penetrated on the inner walls on both sides of the chamber (413), and the clamping rod (412) slides through the corresponding second through holes. A first operating port is opened on the bottom inner wall of the installation box (401), and a second operating port is opened on the inner wall of one side of the installation platform (1), and the first operating port and the second operating port are both compatible with the rotating rod (417).

8. The stretch film packaging machine with a positioning structure according to claim 3, characterized in that: Two clamping plates are fixedly installed in the chamber (413), and the bidirectional screw rod (415) rotates and passes through the two clamping plates.

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