A detector for measuring the gas permeability of a medicinal packaging film

Abstract

The present application discloses a gas permeability detector for a medicinal packaging film, belonging to the technical field of packaging film detection. It mainly includes a housing; a clamping assembly, a testing assembly, and the testing assembly includes: a lower cover, an upper cover is hinged on the lower cover, a lower cavity is arranged inside the lower cover, and an upper cavity is arranged inside the upper cover; at least two groups of gas sources, a first shunt pipe, a first intake pipe, a second bamboo joint pipe is arranged at one end of the first intake pipe, and a partial upper pipe is arranged on the second bamboo joint pipe; a second intake pipe, two groups of detection tanks, two groups of connecting pipes, and a first bamboo joint pipe is arranged on one group of connecting pipes, and a partial lower pipe is arranged on the first bamboo joint pipe. The gas permeability detector for a medicinal packaging film of the present application, through the setting of the testing assembly, when testing the oxygen permeability of the packaging film, the local and the whole can be tested simultaneously to ensure the accuracy of the test results, achieving the effect of being able to perform local testing on the packaging film.

Description

Technical Field

[0001] The present application relates to the technical field of packaging film detection, and specifically provides a gas permeability detector for pharmaceutical packaging films. Background Art

[0002] Pharmaceutical packaging films are special thin film materials used for drug packaging, designed to ensure the safety, effectiveness, and stability of drugs during storage, transportation, and use;

[0003] During the production process of packaging films, it is necessary to detect their gas permeability to ensure that the barrier performance of the packaging films meets the specifications;

[0004] For example, the patent with the publication number CN217738952U specifically discloses a gas permeability detector. When this detector is in use, first open the top cover, remove the threaded cap from the open end of the sealing cover, then place the object to be detected on the open end of the sealing cover, and thread the threaded cap back onto the sealing cover to press the object tightly. At this time, start the vacuum pump to pump out the air inside the sealing cover, and observe the data on the pressure sensor and thermometer to record the air pressure inside the sealing cover. After standing for a period of time, record the air pressure data on the pressure sensor again, and then the gas permeability of the object at this temperature can be calculated;

[0005] However, although the above patent can achieve the test of gas permeability, the detection method is relatively single. It can only perform an overall test on the object to be detected and cannot perform a local test. During the production process of packaging films (such as extrusion and lamination), there may be local thickness unevenness, coating defects, or micropores. And the overall test will calculate the average value, which may cover up local weak areas. In long-term storage, the weak areas will become the breakthrough points for drug oxidation, resulting in local drug failure;

[0006] Therefore, it is necessary to provide a gas permeability detector for pharmaceutical packaging films to solve the above problems.

[0007] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of the present application, and therefore, it may include information that does not constitute prior art. Summary of the Invention

[0008] Based on the above problems existing in the prior art, the problem to be solved by the present application is to provide a gas permeability detector for pharmaceutical packaging films, achieving the effect of being able to perform local tests on packaging films.

[0009] The technical solution adopted by this application to solve its technical problems is as follows: A gas permeability detector for a medicinal packaging film, comprising a housing; a clamping assembly arranged on the housing; a testing assembly arranged on the housing, and the testing assembly includes: a lower cover installed on the housing, an upper cover is hinged on the lower cover, a lower cavity is arranged inside the lower cover, and an upper cavity is arranged inside the upper cover; at least two groups of gas sources installed on one side of the housing; a first shunt pipe connected to at least two groups of gas sources, and an air extraction pipe is arranged at the end of the first shunt pipe away from the gas source; a first intake pipe arranged on the upper cover, a second bamboo joint pipe is arranged at one end of the first intake pipe, and a partial upper pipe is arranged on the second bamboo joint pipe; a second intake pipe arranged on the upper cover; two detection tanks installed on the other side of the housing, a vacuum pipe is arranged inside the detection tanks, and a pressure sensor is arranged on the detection tanks; two connecting pipes respectively connected to the two detection tanks, and a first bamboo joint pipe is arranged on one of the connecting pipes, and a partial lower pipe is arranged on the first bamboo joint pipe.

[0010] Furthermore, an air pump is arranged inside the housing, the air extraction pipe is connected to the air pump, two vacuum pumps are arranged inside the housing, the vacuum pipe is connected to the input end of the vacuum pump, a sealing ring is arranged inside the partial upper pipe, and the partial upper pipe and the partial lower pipe are respectively located inside the upper cavity and the lower cavity.

[0011] Furthermore, the first bamboo joint pipe is formed by sequentially and movably inserting at least two groups of hollow pipes, the hollow pipes have a turning part and a turning groove, and the turning part is movably clamped into the turning groove.

[0012] Furthermore, the clamping assembly includes a fixing plate installed on the upper cover, a clamping groove is formed on the fixing plate, two support plates are installed on the lower cover, a support rod is rotatably installed between the two support plates, and a locking nut is arranged on the support rod and is located above the fixing plate.

[0013] Furthermore, an adjusting assembly is arranged on the testing assembly, and the adjusting assembly includes a fixing part arranged below the partial lower pipe, the fixing part has a bracket installed on the partial lower pipe, two butterfly bolts are threadedly installed on the bracket, at least two screw holes are formed inside the lower cavity, and a locking part is arranged on the partial upper pipe.

[0014] Furthermore, an opening and closing assembly is arranged on the partial lower pipe, and the opening and closing assembly includes a valve pipe arranged on the partial lower pipe, and a cavity is penetrated through the valve pipe.

[0015] Furthermore, a rotating rod is rotatably installed inside the valve pipe, a second flap is arranged on the rotating rod, two installation pipes are rotatably sleeved on the rotating rod, and a first flap is arranged on the installation pipe.

[0016] Further, a limiting rod is installed inside the valve pipe. The limiting rod is located below the rotating rod. Torsion springs are provided at the bottoms of both the first flap and the second flap. One end of each of the two groups of torsion springs is connected to the limiting rod.

[0017] Further, two groups of bosses are provided on the valve pipe. The bosses are located outside the rotating rod. Two groups of grooves are provided on the partial upper pipe, and two groups of slots are provided on the partial upper pipe. The height of the grooves is higher than the height of the slots.

[0018] Further, one end of the rotating rod and one of the mounting pipes both extend out of one of the bosses. A first dial is provided at the end of the mounting pipe extending out of the boss, and a second dial is provided at the end of the rotating rod extending out of the boss. The second dial is located on one side of the first dial, and the first dial and the second dial are arranged relatively staggeredly.

[0019] The beneficial effect of this application is: A gas permeability detector for a medicinal packaging film provided by this application, through the setting of the test component, when testing the oxygen permeability of the packaging film, it can simultaneously test the part and the whole to ensure the accuracy of the test result, achieving the effect of being able to perform local testing on the packaging film.

[0020] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. The following will refer to the drawings to make a further detailed description of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0022] Figure 1 is the overall schematic diagram of a gas permeability detector for a medicinal packaging film in this application;

[0023] Figure 2 is Figure 1 the enlarged schematic diagram at A in

[0024] Figure 3 is Figure 1 the overall schematic diagram of another state in

[0025] Figure 4 is Figure 3 the enlarged schematic diagram at B in

[0026] Figure 5 is Figure 3 the structural schematic diagram of a partial whole in

[0027] Figure 6 is Figure 5 the enlarged schematic diagram at C in

[0028] Figure 7 is Figure 4 Another perspective schematic diagram of the part and the whole in

[0029] Figure 8 is Figure 7 An enlarged schematic diagram of the position D in

[0030] Figure 9 is Figure 7 The structural schematic diagram of the part and the whole in

[0031] Figure 10 is Figure 9 An enlarged schematic diagram of the position E in

[0032] Figure 11 is Figure 8 Another perspective schematic diagram of the part and the whole in

[0033] Among them, each reference numeral in the figure:

[0034] 1. Housing;

[0035] 2. Clamping assembly; 201. Lower cavity; 202. Upper cavity; 21. Lower cover; 22. Upper cover; 23. Fixed plate; 24. Locking nut; 25. Card slot; 26. Support rod; 27. Support plate;

[0036] 3. Testing assembly; 31. Pressure sensor; 32. Detection tank; 33. Vacuum tube; 34. Connecting tube; 35. First intake pipe; 36. Second intake pipe; 37. Exhaust pipe; 38. First shunt pipe; 39. Air source;

[0037] 4. Adjusting assembly; 41. First corrugated pipe; 401. Hollow pipe; 402. Steering part; 403. Steering groove; 42. Local lower pipe; 43. Bracket; 431. Wing nut; 432. Screw hole; 44. Second corrugated pipe; 45. Local upper pipe; 451. Sealing ring; 452. Groove; 453. Slot;

[0038] 5. Opening and closing assembly; 51. Valve pipe; 52. Cavity; 53. First flap; 54. Second flap; 55. Torsion spring; 56. Limiting rod; 57. Installation pipe; 58. Rotating rod; 59. First dialing block; 6. Second dialing block. Detailed implementation manners

[0039] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solution in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0041] Embodiment 1: The detector disclosed in this application is mainly used for detecting the oxygen permeability of pharmaceutical packaging films to test their oxygen permeability;

[0042] As Figures 1 - 4 shown, this application provides a gas permeability detector for pharmaceutical packaging films, including a housing 1. A clamping assembly 2 is provided on the housing 1, and the clamping assembly 2 is used to clamp the packaging film. Specifically:

[0043] The clamping assembly 2 includes a lower cover 21 fixedly installed on the housing 1. An upper cover 22 is hinged on the lower cover 21, and a lower cavity 201 is opened inside the lower cover 21, and an upper cavity 202 is opened inside the upper cover 22. So that when detecting the packaging film, the packaging film can be placed at the lower cavity 201, and then the upper cover 22 is closed to clamp the packaging film. At this time, the packaging film is between the upper cavity 202 and the lower cavity 201;

[0044] A fixing plate 23 is fixedly installed on the upper cover 22. A clamping groove 25 is opened on the fixing plate 23, and two groups of support plates 27 are fixedly installed on the lower cover 21. A support rod 26 is rotatably installed between the two groups of support plates 27, so that the support rod 26 can approach or move away from the fixing plate 23, and when the support rod 26 approaches the fixing plate 23, it can enter the clamping groove 25;

[0045] A locking nut 24 is threadedly connected to the support rod 26, and the locking nut 24 is located above the fixing plate 23. So that after the support rod 26 enters the clamping groove 25, the locking nut 24 is rotated until it contacts the upper surface of the fixing plate 23, thereby fixing the fixing plate 23 and further fixing the upper cover 22;

[0046] A testing assembly 3 is provided on the housing 1, and the testing assembly 3 is used to test the gas passing rate;

[0047] As Figures 1 - 4 shown, the testing assembly 3 includes multiple groups of gas sources 39 fixedly installed on one side of the housing 1. The gas sources 39 are used to store different gases (such as oxygen or other gases, etc.). A first shunt pipe 38 is commonly provided on the multiple groups of gas sources 39, and an air extraction pipe 37 is provided at the end of the first shunt pipe 38 away from the gas sources 39. An air pump (not shown in the figure) is provided inside the housing 1, and the input end of the air pump is connected to the air extraction pipe 37;

[0048] A first intake pipe 35 and a second intake pipe 36 are respectively arranged on the upper cover 22. Both the first intake pipe 35 and the second intake pipe 36 are connected to the output end of the air pump. One ends of the first intake pipe 35 and the second intake pipe 36 both extend into the interior of the upper cavity 202, and a partial upper pipe 45 is arranged at the end of the first intake pipe 35 extending into the upper cavity 202.

[0049] Furthermore, driven by the air pump, the gas in the gas source 39 is respectively pumped into the interior of the upper cavity 202 and the partial upper pipe 45 through the first intake pipe 35 and the second intake pipe 36.

[0050] Two groups of detection tanks 32 are fixedly installed on the other side of the housing 1. A pressure sensor 31 is arranged on the detection tank 32 to facilitate recording test data. Connecting pipes 34 are arranged at the tops of the two groups of detection tanks 32. One end of the connecting pipe 34 far from the detection tank 32 extends into the interior of the lower cavity 201.

[0051] One end of one group of connecting pipes 34 extending into the interior of the lower cavity 201 is provided with a partial lower pipe 42 adapted to the partial upper pipe 45, so that when the upper cover 22 is closed, the partial upper pipe 45 is communicated with the partial lower pipe 42, thereby locally testing the packaging film.

[0052] Vacuum pipes 33 are arranged at the bottoms of the two groups of detection tanks 32. Two groups of vacuum pumps (not shown in the figure) are arranged inside the housing 1. The two groups of vacuum pipes 33 are respectively connected to the input ends of the two groups of vacuum pumps. Furthermore, driven by the vacuum pumps, the air inside the detection tanks 32 and the lower cavity 201 is evacuated.

[0053] To sum up, when detecting the packaging film, open the upper cover 22, place the packaging film on the lower cavity 201, and then close the upper cover 22 to clamp the packaging film. At the same time, the partial upper pipe 45 and the partial lower pipe 42 clamp a part of the packaging film. Then rotate the support rod 26 until it enters the card slot 25, and rotate the lock nut 24 to abut against the upper surface of the fixing plate 23. Start the vacuum pump to evacuate the lower cavity 201 and the partial lower pipe 42. At this time, record the data of the two pressure sensors 31. Then start the air pump to pump the oxygen in the gas source 39 into the upper cavity 202 and the partial upper pipe 45. Let it stand for a period of time, and monitor the pressure data in real time and upload it. Then evaluate the overall and local air permeability by combining the data collected twice.

[0054] Embodiment 2: Although the above process can achieve local and overall tests, the local test points are relatively single, and a single test point may just avoid the defective area, resulting in inaccurate test results. To solve this problem, an adjustment component 4 is arranged on the test component 3, and the adjustment component 4 is used to adjust different measurement points:

[0055] As Figures 4 - 7 shown, the adjusting assembly 4 includes a first corrugated tube 41 disposed between the communicating tube 34 and the local lower tube 42, and a fixing portion is provided below the local lower tube 42. The fixing portion has a bracket 43 mounted on the local lower tube 42;

[0056] Two groups of wing nuts 431 are threadedly mounted on the bracket 43, and a plurality of groups of screw holes 432 are formed inside the lower cavity 201. After the position adjustment of the local lower tube 42 is completed, the wing nuts 431 are screwed into the screw holes 432 for fixing;

[0057] The first corrugated tube 41 is sequentially formed by inserting a plurality of groups of hollow tubes 401 movably, and the hollow tube 401 has a turning portion 402 and a turning groove 403 adapted to the turning portion 402. The turning portion 402 is movably snapped into the turning groove 403;

[0058] Furthermore, when adjusting the position of the local lower tube 42, the angle of the hollow tube 401 can be arbitrarily adjusted, thereby adjusting the position of the local lower tube 42;

[0059] It should be noted that a second corrugated tube 44 having the same structure as the first corrugated tube 41 is provided between the first intake pipe 35 and the local upper tube 45, and a locking portion having the same structure as the fixing portion is provided on the local upper tube 45, so as to lock the local upper tube 45 after adjusting the position, and when adjusting, the corresponding screw holes 432 can be selected to determine the correspondence between the positions of the local upper tube 45 and the local lower tube 42;

[0060] In summary, after measuring at one point, open the upper cover 22, take out the packaging film, then adjust the positions of the local lower tube 42 and the local upper tube 45 through the first corrugated tube 41 and the second corrugated tube 44, and ensure the correspondence between the positions of the local upper tube 45 and the local lower tube 42 through the corresponding screw holes 432. Then screw the wing nuts 431 into the screw holes 432 to fix the local upper tube 45 and the local lower tube 42, and then repeat the process of testing the oxygen transmission rate again.

[0061] Example 3: Although the above process can achieve local testing of different points of the packaging film, when evacuating the local lower tube 42, it can only be evacuated after the upper cover 22 and the lower cover 21 are closed, and the local lower tube 42 cannot be pre-evacuated;

[0062] When evacuating after mold closing, the film material may undergo large-area deformation (such as stretching or compression) due to the pressure difference between the upper and lower sides, which may affect the test results;

[0063] To solve this problem, an opening and closing assembly 5 is provided on the local lower pipe 42 to facilitate sealing of the local lower pipe 42, so that when evacuating, the packaging film will not be deformed greatly;

[0064] As Figures 7 - 10 shown, the opening and closing assembly 5 includes a valve pipe 51 provided on the local lower pipe 42. A cavity 52 is penetrated through the valve pipe 51 to facilitate communication with the local lower pipe 42. A rotating rod 58 is rotatably installed inside the valve pipe 51, and a second flap 54 is provided on the rotating rod 58. At the same time, two sets of mounting pipes 57 are rotatably sleeved on the rotating rod 58;

[0065] A first flap 53 is provided on the mounting pipe 57. The first flap 53 and the second flap 54 can approach or move away from each other under the action of an external force. When moving away, a circle for closing the valve pipe 51 is formed. In the initial state, the first flap 53 and the second flap 54 move away from each other to close the valve pipe 51, so that the local lower pipe 42 can be pre-evacuated before testing;

[0066] A limiting rod 56 is fixedly installed inside the valve pipe 51. The limiting rod 56 is located below the rotating rod 58 to facilitate limiting the rotation range of the first flap 53 and the second flap 54. Torsion springs 55 are provided at the bottoms of the first flap 53 and the second flap 54. One ends of the two sets of torsion springs 55 are connected to the limiting rod 56, so that after the external force disappears, under the action of the restoring force of the torsion spring 55, the first flap 53 and the second flap 54 are reset to close the hollow pipe 401 again;

[0067] As Figure 8 and Figure 11 shown, it should be noted that two sets of bosses (not marked in the figure) are provided on the valve pipe 51. The bosses are located outside the rotating rod 58. One ends of the rotating rod 58 and one set of mounting pipes 57 extend out of one set of bosses. A first dial block 59 is provided at the end of the mounting pipe 57 extending out of the boss. A second dial block 6 is provided at the end of the rotating rod 58 extending out of the boss. The second dial block 6 is located on one side of the first dial block 59, and the first dial block 59 and the second dial block 6 are arranged relatively staggered;

[0068] Continue to refer to Figure 10 , two sets of grooves 452 adapted to the bosses are opened on the local upper pipe 45, and two sets of slots 453 adapted to the first dial block 59 and the second dial block 6 are opened on the local upper pipe 45. The height of the groove 452 is higher than the height of the slot 453;

[0069] Furthermore, when the upper cover 22 is engaged, the local upper pipe 45 is synchronously driven to move until the boss enters the slot 453 to avoid the boss and prevent mechanical interference with the movement of the upper cover 22;

[0070] Meanwhile, the first shifting block 59 and the second shifting block 6 respectively enter into two groups of slots 453, and as the local upper tube 45 continues to move, the slots 453 will contact the first shifting block 59 and the second shifting block 6, and squeeze the first shifting block 59 and the second shifting block 6 to make them rotate, thereby driving the first flap 53 and the second flap 54 to approach each other, thus opening the valve tube 51;

[0071] It should be noted that a sealing ring 451 is arranged inside the local upper tube 45, and the height of the sealing ring 451 is higher than the height of the groove 452, so as to seal it when the local upper tube 45 is engaged with the local lower tube 42, and the supporting force of the two groups of torsion springs 55 is greater than the pressure of the external air pressure, so that the first flap 53 and the second flap 54 will not open when the inside of the local lower tube 42 is evacuated;

[0072] In summary, before closing the upper cover 22, the local upper tube 45 can be pre-evacuated, so that when the upper cover 22 is closed, the local upper tube 45 is synchronously driven to move towards the local lower tube 42, and as the upper cover 22 continues to move, the local upper tube 45 gradually approaches the local lower tube 42 until the boss enters the groove 452, avoiding mechanical interference of the boss on the groove 452. At this time, the first shifting block 59 and the second shifting block 6 respectively enter into two groups of slots 453, and as the local upper tube 45 continues to move, the two groups of slots 453 gradually contact the first shifting block 59 and the second shifting block 6, and continuously squeeze the first shifting block 59 and the second shifting block 6, thereby driving the first shifting block 59 and the second shifting block 6 to rotate, so as to drive the first flap 53 and the second flap 54 to approach each other, and then open the valve tube 51. Subsequently, oxygen is introduced into the local upper tube 45, and the oxygen transmission rate of the packaging film can be tested.

[0073] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gas permeability detector for medicinal packaging films, characterized in that: include: Housing (1); A clamping assembly (2), the clamping assembly (2) being arranged on the housing (1); A test component (3), the test component (3) being arranged on the housing (1), the test component (3) comprising: A lower cover (21), the lower cover (21) being mounted on the housing (1), an upper cover (22) being hingedly connected to the lower cover (21), a lower cavity (201) being provided inside the lower cover (21), and an upper cavity (202) being provided inside the upper cover (22); At least two groups of gas sources (39), wherein the gas sources (39) are installed on one side of the housing (1); a first shunt pipe (38), the first shunt pipe (38) being connected to at least two groups of the gas sources (39), and an exhaust pipe (37) being provided at one end of the first shunt pipe (38) away from the gas sources (39); A first air inlet pipe (35), the first air inlet pipe (35) being arranged on the upper cover (22), a second bamboo tube (44) being arranged at one end of the first air inlet pipe (35), and a partial upper tube (45) being arranged on the second bamboo tube (44); a second air intake pipe (36), the second air intake pipe (36) being arranged on the upper cover (22); Two groups of detection tanks (32), the detection tanks (32) being mounted on the other side of the housing (1), the detection tanks (32) being provided with vacuum tubes (33) inside, and the detection tanks (32) being provided with air pressure sensors (31); Two groups of connecting tubes (34), the two groups of connecting tubes (34) being connected to the two groups of detection tanks (32) respectively, one group of connecting tubes (34) being provided with a first bamboo tube (41), the first bamboo tube (41) being provided with a local lower tube (42); An air pump is disposed inside the housing (1), and the air extraction pipe (37) is connected to the air pump; The partial upper tube (45) and the partial lower tube (42) are located inside the upper chamber (202) and the lower chamber (201), respectively; Driven by the air pump, the gas in the gas source (39) is pumped into the interior of the upper chamber (202) and the partial upper tube (45) through the first air inlet pipe (35) and the second air inlet pipe (36) respectively; One end of the connecting tube (34) away from the detection tank (32) extends into the interior of the lower chamber (201); when the upper cover (22) is closed, the local upper tube (45) is connected to the local lower tube (42), thereby performing a local test on the packaging film.

2. The gas permeability detector for pharmaceutical packaging films according to claim 1, characterized in that: Two groups of vacuum pumps are arranged inside the housing (1), the vacuum tube (33) is connected to the input end of the vacuum pump, and a sealing ring (451) is arranged inside the local upper tube (45).

3. The gas permeability detector for pharmaceutical packaging films according to claim 1, characterized in that: The first bamboo tube (41) is formed by at least two groups of hollow tubes (401) being movably plugged in sequence, the hollow tube (401) having a turning portion (402) and a turning groove (403), the turning portion (402) being movably inserted into the turning groove (403).

4. The gas permeability detector for pharmaceutical packaging films according to claim 2, characterized in that: The clamping assembly (2) comprises a fixing plate (23) mounted on the upper cover (22), a slot (25) being provided on the fixing plate (23), two groups of support plates (27) being mounted on the lower cover (21), a support rod (26) being rotatably mounted between the two groups of support plates (27), a locking nut (24) being provided on the support rod (26), and the locking nut (24) being located above the fixing plate (23).

5. The gas permeability detector for pharmaceutical packaging films according to claim 1, characterized in that: The test assembly (3) is provided with an adjustment assembly (4), the adjustment assembly (4) comprising a fixing portion arranged below the local lower tube (42), the fixing portion having a bracket (43) mounted on the local lower tube (42), two groups of butterfly bolts (431) being threadedly mounted on the bracket (43), at least two groups of screw holes (432) being provided inside the lower cavity (201), and a locking portion being provided on the local upper tube (45).

6. The gas permeability detector for pharmaceutical packaging films according to claim 1, characterized in that: An opening and closing assembly (5) is arranged on the local lower tube (42), and the opening and closing assembly (5) comprises a valve tube (51) arranged on the local lower tube (42), and a cavity (52) is arranged through the valve tube (51).

7. The gas permeability detector for pharmaceutical packaging films according to claim 6, characterized in that: A rotating rod (58) is rotatably mounted inside the valve tube (51), and a second flap (54) is arranged on the rotating rod (58). Two groups of mounting tubes (57) are rotatably sleeved on the rotating rod (58), and a first flap (53) is arranged on the mounting tubes (57).

8. The gas permeability detector for pharmaceutical packaging films according to claim 7, characterized in that: A limit rod (56) is installed inside the valve tube (51), and the limit rod (56) is located below the rotating rod (58). Torsion springs (55) are provided at the bottom of the first flap (53) and the second flap (54), and one end of the two groups of torsion springs (55) are connected to the limit rod (56).

9. The gas permeability detector for pharmaceutical packaging films according to claim 8, characterized in that: The valve tube (51) is provided with two groups of bosses, the bosses are located outside the rotating rod (58), the partial upper tube (45) is provided with two groups of grooves (452), the partial upper tube (45) is provided with two groups of slots (453), and the height of the grooves (452) is higher than the height of the slots (453).

10. A gas permeability detector for pharmaceutical packaging films according to claim 9, characterized in that: One end of the rotating rod (58) and one end of one group of the mounting tubes (57) both extend out of one group of bosses; one end of the mounting tube (57) extending out of the boss is provided with a first shift block (59); one end of the rotating rod (58) extending out of the boss is provided with a second shift block (6); the second shift block (6) is located on one side of the first shift block (59); the first shift block (59) and the second shift block (6) are arranged in a staggered manner relative to each other.

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