Air tightness detection device for low-pressure plastic bag

Abstract

The utility model discloses an air tightness detection device for a low pressure plastic bag, which relates to the technical field of air tightness detection and comprises a detection pool, a sealing frame and a bag body, one side of the sealing frame is fixedly connected with a detection frame, and the other side of the sealing frame is fixedly connected with a support frame. The two ends of the outer portion of the detection frame are movably connected with the inner side of the detection pool, and the outer side of the detection pool is fixedly connected with a displayer. By means of the rotating mechanism, the first servo motor is started, the supporting frame is driven to rotate around the driving rod, the detection frame is driven to rotate downwards along the inner side of the detection pool till most of the bag body is immersed into liquid in the detection pool, and then whether bubbles appear in the detection pool or not is observed; and the numerical value change of the first pressure plate and the second pressure plate is observed, a large degree of leakage can be conveniently and visually seen through the detection pool, tiny leakage can be detected through the numerical value change, and the detection convenience and accuracy are improved to a great extent.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection device for low-pressure plastic bags. Background Art

[0002] The air tightness test of plastic bags is a key link in ensuring product quality and safety in the packaging industry. The air tightness of plastic bags can be effectively tested by adopting various methods such as pressure test, vacuum test, bubble method, sound wave detection and electronic nose technology. The application of automated testing equipment and handheld testing instruments has improved the detection efficiency and accuracy.

[0003] However, the air tightness test of plastic bags is usually carried out by only a single method, each method has its advantages and disadvantages, and there is a lack of a device that combines different methods. For example, the bubble method can more intuitively observe plastic bags with large air leakage, and the pressure test can deduce the occurrence of slight leakage from the numerical changes. Combining the two, the different leakage degrees of plastic bags can be judged. Therefore, an air tightness detection device for low-pressure plastic bags is needed to solve the existing deficiencies. Utility Model Content

[0004] The purpose of the utility model is to provide an airtightness detection device for low-pressure plastic bags, which greatly improves the convenience and accuracy of detection through the provision of a rotating mechanism; avoids gas leakage at the bag opening of the bag body through the provision of a sealing mechanism, thereby improving the accuracy of detection; and facilitates the control of the connection and separation between the inflation head and the bag opening of the bag body through the provision of a moving mechanism, thereby improving the convenience of inflating the bag body.

[0005] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0006] The utility model discloses an air tightness detection device for low-pressure plastic bags, comprising a detection pool, a sealing frame and a bag body, one side of the sealing frame is fixedly connected with the detection frame, and the other side of the sealing frame is fixedly connected with a support frame, the two outer ends of the detection frame are movably connected with the inner side of the detection pool, and the outer side of the detection pool is fixedly connected with a display, the top of the detection pool is fixedly connected with a rotating mechanism, and the rotating mechanism is fixedly connected with the support frame, the bag body is located on the inner side of the detection frame, the bag opening of the bag body is located on the inner side of the sealing frame, the inner side of the sealing frame is fixedly connected with a sealing mechanism, and the sealing mechanism is movably connected with the bag opening of the bag body, the inner side of the support frame is movably connected with an inflation head, the inflation head is movably connected with the bag opening of the bag body, the inner side of the support frame is fixedly connected with a moving mechanism, and the moving mechanism is fixedly connected with the outer side of the inflation head.

[0007] The utility model is further configured as follows: a group of symmetrical pressure plates 1 are arranged on the inner side of the detection frame, the two sides of the bag body are respectively movably connected to the front side of the pressure plate 1, the rear side of the pressure plate 1 is fixedly connected to a moving rod 1, the moving rod 1 penetrates the detection frame, and the moving rod 1 is movably connected to the detection frame, a reset spring is sleeved on the outer side of the moving rod 1, one end of the reset spring is fixedly connected to the rear side of the pressure plate 1, and the other end of the reset spring is fixedly connected to the inner side of the detection frame.

[0008] The utility model is further configured as follows: a second pressure plate is provided on the inner side of the detection frame, the front side of the second pressure plate is attached to the outer side of the bag body, and a second moving rod is fixedly connected to the rear side of the second pressure plate, the second moving rod passes through the detection frame, and the second moving rod is movably connected to the detection frame, a compression spring is sleeved on the outer side of the second moving rod, one end of the compression spring is fixedly connected to the rear side of the second pressure plate, and the other end of the compression spring is fixedly connected to the inner side of the detection frame.

[0009] The utility model is further configured as follows: the rotating mechanism includes a support platform, a driving rod and a servo motor; the support platform is symmetrically arranged, and the bottom end of the support platform is fixedly connected to the top end of the detection pool, the two ends of the driving rod are respectively movably connected to the support platform through bearings, the servo motor is fixedly connected to the top end of the support platform, and the output end of the servo motor is fixedly connected to one end of the driving rod, the driving rod passes through the support frame, and the driving rod is fixedly connected to the support frame.

[0010] The utility model is further configured as follows: the sealing mechanism includes a accommodating box, a sealing plate, a movable plate, a connecting rod 1 and a slider; the top end of the sealing plate is fixedly connected to the bottom end of the movable plate, and the bottom end of the sealing plate fits with the bag opening of the bag body; the accommodating box is fixedly connected to the inner side of the sealing frame, the top end of the movable plate is movably connected to the bottom end of the accommodating box, the connecting rod 1 and the slider are symmetrically arranged, the bottom end of the connecting rod 1 is movably connected to the top end of the movable plate through a rotating shaft, and the top end of the connecting rod 1 is movably connected to the bottom end of the slider through a rotating shaft, and the slider is movably connected to the inside of the accommodating box.

[0011] The utility model is further configured such that the sealing mechanism also includes a threaded rod and servo motor 2, a group of symmetrical threads are opened on the outer side of the threaded rod, the threaded rod passes through the slider, and the threaded rod is threadedly connected to the slider, the servo motor 2 is fixedly connected to the interior of the storage box, the output end of the servo motor 2 is fixedly connected to one end of the threaded rod, and the other end of the threaded rod is movably connected to the interior of the storage box through a bearing.

[0012] The utility model is further configured as follows: the moving mechanism includes connecting rod two, a cross bar and a hydraulic rod, the bottom end of the connecting rod two is movably connected to the outside of the inflation head through a rotating shaft, the cross bar passes through the top end of the connecting rod two, and the cross bar is movably connected to the connecting rod two, both ends of the cross bar are movably connected to the inner side of the support frame, the hydraulic rod is fixedly connected to the outer side of the support frame, and the telescopic end of the hydraulic rod is fixedly connected to the outer side of the cross bar.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model starts servo motor 1 through the setting of the rotating mechanism, drives the support frame to rotate around the driving rod, drives the detection frame to rotate downward along the inner side of the detection pool until most of the bag body is immersed in the liquid inside the detection pool, and then observes whether there are bubbles in the detection pool, and observes the numerical changes of pressure plate 1 and pressure plate 2. A large degree of leakage can be conveniently and intuitively seen through the detection pool, and a slight leakage can be detected through the numerical changes, thereby greatly improving the convenience and accuracy of detection.

[0015] 2. The utility model starts servo motor 2 through the sealing mechanism provided, drives the threaded rod to rotate, makes the sliders approach each other, drives connecting rod 1 to rotate, pushes the movable plate to move downward, makes the sealing plate fit the bag opening of the bag body, and then uses the inflation port to inflate the inside of the bag body until the bag body continues to expand. At this time, under the action of the sealing plate, gas leakage at the bag opening of the bag body is avoided, thereby improving the accuracy of detection.

[0016] 3. The utility model starts the hydraulic rod through the movable mechanism, pushes the cross bar downward, and causes the cross bar to rotate, thereby pushing the inflation head to move inside the support frame until the inflation head is inserted into the bag opening of the bag body, thereby facilitating the control of the connection and separation between the inflation head and the bag opening of the bag body, thereby improving the convenience of inflating the bag body.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the exploded structure of part of the structure of the utility model;

[0021] Figure 3 For this utility model Figure 2 Another perspective structural diagram of;

[0022] Figure 4 This is a schematic diagram of the rotating mechanism structure of the utility model;

[0023] Figure 5 This is a schematic diagram of the sealing mechanism structure of the utility model;

[0024] Figure 6 It is a schematic diagram of the structure of the mobile mechanism of the utility model.

[0025] In the figure: 1. detection pool; 2. sealing frame; 3. bag body; 4. detection frame; 5. support frame; 6. display; 7. rotating mechanism; 701. support table; 702. driving rod; 703. servo motor one; 8. sealing mechanism; 801. containing box; 802. sealing plate; 803. movable plate; 804. connecting rod one; 805. sliding block; 806. threaded rod; 807. servo motor two; 9. inflating head; 10. moving mechanism; 1001. connecting rod two; 1002. cross bar; 1003. hydraulic rod; 11. pressure plate one; 12. moving rod one; 13. reset spring; 14. pressure plate two; 15. moving rod two; 16. compression spring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Embodiment 1

[0028] like Figure 1-6As shown, the utility model provides a technical solution: an airtightness detection device for low-pressure plastic bags, comprising a detection pool 1, a sealing frame 2 and a bag body 3, one side of the sealing frame 2 is fixedly connected with a detection frame 4, and the other side of the sealing frame 2 is fixedly connected with a support frame 5, the outer ends of the detection frame 4 are movably connected to the inner side of the detection pool 1, and the outer side of the detection pool 1 is fixedly connected with a display 6, the top of the detection pool 1 is fixedly connected with a rotating mechanism 7, and the rotating mechanism 7 is fixedly connected with the support frame 5, the bag body 3 is located on the inner side of the detection frame 4, the bag opening of the bag body 3 is located on the inner side of the sealing frame 2, the inner side of the sealing frame 2 is fixedly connected with a sealing mechanism 8, and the sealing mechanism 8 is movably connected with the bag opening of the bag body 3, the inner side of the support frame 5 is movably connected with an inflation head 9, the inflation head 9 is movably connected with the bag opening of the bag body 3, the inner side of the support frame 5 is fixedly connected with a moving mechanism 10, and the moving mechanism 10 is fixedly connected to the outer side of the inflation head 9, and the inner side of the detection frame 4 is provided with A group of symmetrical pressure plates 11, both sides of the bag body 3 are movably connected to the front side of the pressure plate 11 respectively, the rear side of the pressure plate 11 is fixedly connected with a moving rod 12, the moving rod 12 penetrates the detection frame 4, and the moving rod 12 is movably connected to the detection frame 4, the outer side of the moving rod 12 is sleeved with a return spring 13, one end of the return spring 13 is fixedly connected to the rear side of the pressure plate 11, and the other end of the return spring 13 is fixedly connected to the inner side of the detection frame 4, the inner side of the detection frame 4 is provided with a pressure plate 2 14, the front side of the pressure plate 2 14 is attached to the outer side of the bag body 3, and the rear side of the pressure plate 2 14 is fixedly connected with a moving rod 2 15, the moving rod 2 15 penetrates the detection frame 4, and the moving rod 2 15 is movably connected to the detection frame 4, the outer side of the moving rod 2 15 is sleeved with a compression spring 16, one end of the compression spring 16 is fixedly connected to the rear side of the pressure plate 2 14, and the other end of the compression spring 16 is fixedly connected to the inner side of the detection frame 4.

[0029] First, the bag body 3 is placed on the inner side of the detection frame 4, and the bag mouth of the bag body 3 is pushed to the inner side of the sealing frame 2. Then, the hydraulic rod 1003 is started to push the cross bar 1002 to move downward, so that the cross bar 1002 rotates, thereby pushing the inflation head 9 to move on the inner side of the support frame 5 until the inflation head 9 is inserted into the bag mouth of the bag body 3; then, the servo motor 807 is started to drive the threaded rod 806 to rotate, so that the sliders 805 approach each other, drive the connecting rod 804 to rotate, and push the movable plate 803 to move downward, so that the sealing plate 802 fits the bag mouth of the bag body 3, and then use the inflation port to inflate the inside of the bag body 3 until the bag body 3 continues to expand and the pressure plate 1 is pressed. 1 and pressure plate 2 14 are continuously squeezed, driving moving rod 12 and moving rod 2 15 to move away, and shortening the reset spring 13 and the compression spring 16. At this time, the pressure values ​​of pressure plate 11 and pressure plate 2 14 are displayed by display 6 until the bag body 3 is stopped from being inflated, and the pressure values ​​of pressure plate 11 and pressure plate 2 14 are kept fixed; then, servo motor 1 703 is started to drive the support frame 5 to rotate around the driving rod 702, and drive the detection frame 4 to rotate downward along the inner side of the detection pool 1 until most of the bag body 3 is immersed in the liquid inside the detection pool 1, and then observe whether there are bubbles in the detection pool 1, and observe the value changes of pressure plate 11 and pressure plate 2 14.

[0030] Embodiment 2

[0031] like Figure 1 and Figure 4 As shown, the rotating mechanism 7 includes a support platform 701, a driving rod 702 and a servo motor 703. The support platform 701 is symmetrically arranged, and the bottom end of the support platform 701 is fixedly connected to the top of the detection pool 1, and the two ends of the driving rod 702 are movably connected to the support platform 701 through bearings respectively. The servo motor 703 is fixedly connected to the top of the support platform 701, and the output end of the servo motor 703 is fixedly connected to one end of the driving rod 702. The driving rod 702 passes through the support frame 5, and the driving rod 702 is fixedly connected to the support frame 5.

[0032] Start the servo motor 703, drive the support frame 5 to rotate around the driving rod 702, and drive the detection frame 4 to rotate downward along the inner side of the detection pool 1 until most of the bag body 3 is immersed in the liquid inside the detection pool 1, then observe whether there are bubbles in the detection pool 1, and observe the numerical changes of the pressure plate 11 and the pressure plate 2 14. A large degree of leakage can be conveniently and intuitively seen through the detection pool 1, and a slight leakage can be detected through the numerical changes, thereby greatly improving the convenience and accuracy of detection.

[0033] Embodiment 3

[0034] like Figure 1 and Figure 5As shown, the sealing mechanism 8 includes a containing box 801, a sealing plate 802, a movable plate 803, a connecting rod 804 and a slider 805. The top of the sealing plate 802 is fixedly connected to the bottom of the movable plate 803, and the bottom of the sealing plate 802 is in contact with the bag opening of the bag body 3. The containing box 801 is fixedly connected to the inner side of the sealing frame 2, and the top of the movable plate 803 is movably connected to the bottom of the containing box 801. The connecting rod 804 and the slider 805 are symmetrically arranged. The bottom end of the connecting rod 804 is movably connected to the top of the movable plate 803 through a rotating shaft, and the top of the connecting rod 804 is respectively connected to the top of the movable plate 803 through a rotating shaft. The rotating shaft is movably connected to the bottom end of the slider 805, and the slider 805 is movably connected to the inside of the containing box 801. The sealing mechanism 8 also includes a threaded rod 806 and a servo motor 807. A group of symmetrical threads are opened on the outer side of the threaded rod 806. The threaded rod 806 passes through the slider 805, and the threaded rod 806 is threadedly connected to the slider 805. The servo motor 807 is fixedly connected to the inside of the containing box 801. The output end of the servo motor 807 is fixedly connected to one end of the threaded rod 806, and the other end of the threaded rod 806 is movably connected to the inside of the containing box 801 through a bearing.

[0035] Start the servo motor 2 807 to drive the threaded rod 806 to rotate, so that the sliders 805 are close to each other, and the connecting rod 1 804 is driven to rotate, pushing the movable plate 803 to move downward, so that the sealing plate 802 fits the bag opening of the bag body 3, and then the inflation port is used to inflate the inside of the bag body 3 until the bag body 3 continues to expand. At this time, under the action of the sealing plate 802, gas leakage at the bag opening of the bag body 3 is avoided, thereby improving the accuracy of detection.

[0036] Embodiment 4

[0037] like Figure 1 and Figure 6 As shown, the moving mechanism 10 includes a second connecting rod 1001, a cross bar 1002 and a hydraulic rod 1003. The bottom end of the second connecting rod 1001 is movably connected to the outer side of the inflation head 9 through a rotating shaft. The cross bar 1002 passes through the top of the second connecting rod 1001, and the cross bar 1002 is movably connected to the second connecting rod 1001. Both ends of the cross bar 1002 are movably connected to the inner side of the support frame 5. The hydraulic rod 1003 is fixedly connected to the outer side of the support frame 5, and the telescopic end of the hydraulic rod 1003 is fixedly connected to the outer side of the cross bar 1002.

[0038] Start the hydraulic rod 1003 and push the cross bar 1002 downward, causing the cross bar 1002 to rotate, thereby pushing the inflation head 9 to move inside the support frame 5 until the inflation head 9 is inserted into the bag opening of the bag body 3, thereby facilitating the control of the connection and separation between the inflation head 9 and the bag opening of the bag body 3, thereby improving the convenience of inflating the bag body 3.

[0039] Working principle: When in use, first, place the bag body 3 on the inner side of the detection frame 4, and push the bag mouth of the bag body 3 to the inner side of the sealing frame 2, then start the hydraulic rod 1003, push the cross bar 1002 to move downward, so that the cross bar 1002 rotates, thereby pushing the inflation head 9 to move on the inner side of the support frame 5 until the inflation head 9 is inserted into the bag mouth of the bag body 3; then, start the servo motor 2 807, drive the threaded rod 806 to rotate, so that the sliders 805 approach each other, drive the connecting rod 1 804 to rotate, push the movable plate 803 to move downward, so that the sealing plate 802 fits the bag mouth of the bag body 3, and then use the inflation port to inflate the inside of the bag body 3 until the bag body 3 continues to expand and The pressure plate 11 and the pressure plate 2 14 are continuously squeezed, driving the moving rod 12 and the moving rod 2 15 to move away, and shortening the reset spring 13 and the compression spring 16. At this time, the pressure values ​​of the pressure plates 11 and 14 are displayed on the display 6 until the bag body 3 is stopped from being inflated, and the pressure values ​​of the pressure plates 11 and 14 are kept fixed; then, the servo motor 1 703 is started to drive the support frame 5 to rotate around the driving rod 702, and drive the detection frame 4 to rotate downward along the inner side of the detection pool 1 until most of the bag body 3 is immersed in the liquid inside the detection pool 1, and then observe whether there are bubbles in the detection pool 1, and observe the value changes of the pressure plates 11 and 14.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An air tightness detection device for low-pressure plastic bags, comprising a detection cell (1), a sealing frame (2) and a bag body (3), characterized in that: One side of the sealing frame (2) is fixedly connected to a detection frame (4), and the other side of the sealing frame (2) is fixedly connected to a support frame (5), the outer ends of the detection frame (4) are movably connected to the inner side of the detection pool (1), and the outer side of the detection pool (1) is fixedly connected to a display (6), the top of the detection pool (1) is fixedly connected to a rotating mechanism (7), and the rotating mechanism (7) is fixedly connected to the support frame (5), the bag body (3) is located on the inner side of the detection frame (4), and the detection pool (1) is fixedly connected to the detection frame (4). The bag opening of the bag body (3) is located on the inner side of the sealing frame (2); a sealing mechanism (8) is fixedly connected to the inner side of the sealing frame (2), and the sealing mechanism (8) is movably connected to the bag opening of the bag body (3); an inflation head (9) is movably connected to the inner side of the support frame (5), and the inflation head (9) is movably connected to the bag opening of the bag body (3); a moving mechanism (10) is fixedly connected to the inner side of the support frame (5), and the moving mechanism (10) is fixedly connected to the outer side of the inflation head (9).

2. The air tightness detection device for low-pressure plastic bags according to claim 1, characterized in that: A group of symmetrical pressure plates (11) are arranged on the inner side of the detection frame (4), and the two sides of the bag body (3) are respectively movably connected to the front side of the pressure plate (11), and the rear side of the pressure plate (11) is fixedly connected to a moving rod (12), the moving rod (12) passes through the detection frame (4), and the moving rod (12) is movably connected to the detection frame (4), and the outer side of the moving rod (12) is sleeved with a return spring (13), one end of the return spring (13) is fixedly connected to the rear side of the pressure plate (11), and the other end of the return spring (13) is fixedly connected to the inner side of the detection frame (4).

3. The air tightness detection device for low-pressure plastic bags according to claim 1, characterized in that: A second pressure plate (14) is arranged on the inner side of the detection frame (4), the front side of the second pressure plate (14) is in contact with the outer side of the bag body (3), and a second moving rod (15) is fixedly connected to the rear side of the second pressure plate (14), the second moving rod (15) passes through the detection frame (4), and the second moving rod (15) is movably connected to the detection frame (4), and a compression spring (16) is sleeved on the outer side of the second moving rod (15), one end of the compression spring (16) is fixedly connected to the rear side of the second pressure plate (14), and the other end of the compression spring (16) is fixedly connected to the inner side of the detection frame (4).

4. The air tightness detection device for low-pressure plastic bags according to claim 1, characterized in that: The rotating mechanism (7) comprises a support platform (701), a driving rod (702) and a servo motor (703); the support platform (701) is symmetrically arranged, and the bottom end of the support platform (701) is fixedly connected to the top end of the detection pool (1); the two ends of the driving rod (702) are movably connected to the support platform (701) through bearings, respectively; the servo motor (703) is fixedly connected to the top end of the support platform (701), and the output end of the servo motor (703) is fixedly connected to one end of the driving rod (702); the driving rod (702) passes through the support frame (5), and the driving rod (702) is fixedly connected to the support frame (5).

5. The air tightness detection device for low-pressure plastic bags according to claim 1, characterized in that: The sealing mechanism (8) comprises a containing box (801), a sealing plate (802), a movable plate (803), a connecting rod (804) and a sliding block (805); the top end of the sealing plate (802) is fixedly connected to the bottom end of the movable plate (803), and the bottom end of the sealing plate (802) is in contact with the bag opening of the bag body (3); the containing box (801) is fixedly connected to the inner side of the sealing frame (2); the top end of the movable plate (803) is movably connected to the bottom end of the containing box (801); the connecting rod (804) and the sliding block (805) are symmetrically arranged; the bottom end of the connecting rod (804) is movably connected to the top end of the movable plate (803) via a rotating shaft; the top end of the connecting rod (804) is movably connected to the bottom end of the sliding block (805) via a rotating shaft; and the sliding block (805) is movably connected to the inside of the containing box (801).

6. The air tightness detection device for low-pressure plastic bags according to claim 5, characterized in that: The sealing mechanism (8) further comprises a threaded rod (806) and a second servo motor (807); a group of symmetrical threads are formed on the outer side of the threaded rod (806); the threaded rod (806) passes through the slider (805), and the threaded rod (806) is threadedly connected to the slider (805); the second servo motor (807) is fixedly connected to the interior of the containing box (801); the output end of the second servo motor (807) is fixedly connected to one end of the threaded rod (806); and the other end of the threaded rod (806) is movably connected to the interior of the containing box (801) via a bearing.

7. The air tightness detection device for low-pressure plastic bags according to claim 1, characterized in that: The moving mechanism (10) comprises a second connecting rod (1001), a cross bar (1002) and a hydraulic rod (1003); the bottom end of the second connecting rod (1001) is movably connected to the outer side of the inflation head (9) via a rotating shaft; the cross bar (1002) passes through the top end of the second connecting rod (1001), and the cross bar (1002) is movably connected to the second connecting rod (1001); both ends of the cross bar (1002) are movably connected to the inner side of the support frame (5); the hydraulic rod (1003) is fixedly connected to the outer side of the support frame (5), and the telescopic end of the hydraulic rod (1003) is fixedly connected to the outer side of the cross bar (1002).

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