An airbag type test fixture for air tightness of paper bags

Abstract

The present invention discloses an airbag type inspection tool for the air tightness of a paper bag, including an airbag, which is a rectangular parallelepiped in the expanded state, and the vertical projection contour of the airbag in the expanded state is consistent with the opening contour of the paper bag; an air pipe, including an air inlet pipe running through the airbag; when the airbag is inserted into the paper bag, the two ends of the air inlet pipe include a first air inlet located outside the paper bag, and also include a first air outlet located inside the paper bag, and the air inlet pipe also has an inner air outlet located inside the airbag, the inner air outlet is connected to the first air valve, and the first air outlet is connected to the second air valve; the first air inlet is connected to an air compressor, the first air valve and the second air valve are self-acting pressure control valves, the first air valve and the second air valve are two-way valves and one-way valves respectively, and the pressure required to open the second air valve is greater than the first air valve; a rigid plate is attached to the top of the airbag, and two rigid plates are arranged in mirror images on both sides of the air inlet pipe. The invention can be used to detect the air tightness of paper bags, with low equipment cost and fast entry and exit of paper bags.

Description

Technical Field

[0001] The invention relates to the field of paper bag inspection tools, and in particular to an airbag type inspection tool for the air tightness of paper bags. Background Art

[0002] Hand-held shopping paper bags are a common type of container in major business districts, and are particularly widely used in the clothing consumption industry. Today's shopping paper bags tend to have a simple and uniform structure, and when opened, they are all rectangular with an open top. The entire paper bag is generally formed by folding and bonding a flat sheet of paper. There are often multiple overlapping bonding areas at the bottom of the paper bag, and the bonding quality needs to be controlled. If the required bonding areas are not fully covered, the connection strength will not reach the designed state, which will in turn affect the overall carrying capacity of the paper bag. However, the bonding area is often between two layers of paper, which is difficult to visually inspect. The glue is generally transparent, and it is impossible to check whether the glue is fully bonded by shining light through the paper bag. Summary of the invention

[0003] The problem to be solved by the present invention is to provide an airbag type inspection tool for the air tightness of a paper bag, which can perform air tightness inspection on the paper bag, has low equipment cost, and is quick to put in and out of the paper bag.

[0004] In order to solve the above problems, the present invention provides an airbag type inspection tool for the air tightness of paper bags. In order to achieve the above purpose, the technical solution adopted by the present invention to solve its technical problems is:

[0005] An airbag type inspection tool for the air tightness of a paper bag comprises: an airbag, which is a rectangular parallelepiped in an expanded state, and the vertical projection contour of the airbag in the expanded state coincides with the opening contour of the paper bag; an air pipe, comprising an air inlet pipe penetrating the airbag; when the airbag is inserted into the paper bag, both ends of the air inlet pipe comprise a first air inlet located outside the paper bag, and also comprise a first air outlet located inside the paper bag, the air inlet pipe also comprises an inner air outlet located inside the airbag, the inner air outlet is connected to a first air valve, and the first air outlet is connected to a second air valve; the first air inlet is connected to an air compressor, the first air valve and the second air valve are self-acting pressure control valves, the first air valve and the second air valve are respectively a two-way valve and a one-way valve, and the pressure required to open the second air valve is greater than that of the first air valve; a rigid plate is attached to the top of the airbag, and two rigid plates are respectively arranged on both sides of the air inlet pipe in a mirror-symmetrical manner.

[0006] The beneficial effect of adopting the above technical solution is: the air tightness test of the paper bag can reflect whether the overlapping bonding is complete and firm from another perspective. However, the paper bag has a large opening by nature, so the airbag is used to block the opening. The airbag itself is small in size when not inflated, which is convenient for entering the bag body and not easy to interfere with the opening of the bag body. After entering the bag body, the airbag begins to inflate and eventually blocks the mouth of the paper bag. The airbag has a relatively gentle effect, and can be airtight after contacting the paper bag, and is not easy to break the paper bag.

[0007] The rigid plate can strengthen the structural strength of the top of the airbag, ensuring that the top of the inflated airbag is basically horizontal, and then ensuring that the airbag fits better with the inner wall of the paper bag. The two rigid plates unfold after the airbag inflates, and the two rigid plates fold over each other after the airbag shrinks, thereby ensuring that the horizontal cross-sectional profile of the folded airbag becomes smaller, making it easier to enter and exit the opening of the paper bag.

[0008] An air compressor can be used as an air source to inflate or shrink the airbag and inflate the airtightness of the paper bag. The self-operated pressure control valve uses the principle of the pre-valve pressure of the working medium passing through the valve core, and uses the reaction force of the spring to balance. Since the opening pressures of the second air valve and the first air valve are different, the air compressor will first inflate the airbag when it continues to work. When the airbag is inflated, the air pressure in the airbag reaches a certain level before it will inflate the paper bag. At this time, the opening of the paper bag is just closed. The entire technical solution has a low cost and does not require expensive electrically controlled air valves. The airbag needs to switch between the two states of inflation and folding, so the first air valve is a two-way valve. This technical solution can use the repeated expansion and contraction of the airbag and the blowing of the air inlet pipe to achieve airtightness inspection of the bottom of each paper bag.

[0009] As a further improvement of the present invention, the airbag is made of a flexible material, and is composed of a top cloth, a bottom cloth, two side cloths, and two end cloths. The air inlet pipe passes through the top cloth and the bottom cloth, and the outer wall is sealed and connected to the top cloth and the bottom cloth. The rigid plate is attached to the top cloth, and the edge of the rigid plate does not contact the edge of the top cloth.

[0010] The beneficial effects of adopting the above technical solution are: ensuring that the surface of the airbag after expansion is a rectangular parallelepiped as a whole. The shape and size of the top cloth are the same as the shape and size of the opening of the paper bag after expansion. The rigid plate does not contact the edge of the top cloth, ensuring that the rigid plate does not contact the inner wall of the paper bag to avoid damaging the paper bag, and at the same time facilitating the rapid entry and exit of the deflated airbag in and out of the paper bag.

[0011] As a further improvement of the present invention, the distance between the two end cloths is greater than the distance between the two side cloths, the length direction of the rigid plate is parallel to the length direction of the top cloth itself; the distance from the rigid plate to the nearest side cloth is smaller than the distance from the rigid plate to the nearest end cloth.

[0012] The beneficial effect of adopting the above technical solution is that the flexible top cloth acts as a flexible hinge connecting the rigid plate. When the paper bag is folded and opened, the opening length of the paper bag changes less, but the opening width changes more. The distances from the rigid plate to the edges of the top cloth are also different.

[0013] As a further improvement of the present invention, an elastic rope is commonly connected between the upper surfaces of the two rigid plates, and when the upper surfaces of the two rigid plates overlap in the same spatial plane, the elastic rope is in a tensioned state.

[0014] The beneficial effect of adopting the above technical solution is that the elastic rope applies elastic force, so that the two rigid plates are folded only in a specified direction, so that the top cloth is folded in a V shape instead of an inverted V shape, and the airbag in the V-shaped folded state is easy to quickly enter the opening of the paper bag.

[0015] As a further improvement of the present invention, two elastic ropes are arranged on both sides of the air intake pipe, and a gap is formed between the two rigid plates. The gap is equal to the outer diameter of the air intake pipe, and the length direction of the elastic rope itself is perpendicular to the length direction of the gap itself.

[0016] The beneficial effect of adopting the above technical solution is that the portion of the top surface in the gap acts as a flexible hinge, and the outer wall of the air intake pipe also limits the movement of the rigid plate to a certain extent, thereby preventing the rigid plate from swinging or bumping in an irregular manner.

[0017] As a further improvement of the present invention, the air pipe also includes an air outlet pipe that passes through the top cloth and the bottom cloth and the outer wall is sealed with the top cloth and the bottom cloth; when the airbag is inserted into the paper bag, both ends of the air outlet pipe include a second air outlet located outside the paper bag, and also include a second air inlet located inside the paper bag, the second air inlet is connected to a third air valve, the third air valve is a self-powered pressure control valve, and the pressure required to open the third air valve is greater than that of the second air valve.

[0018] The beneficial effect of adopting the above technical solution is that the air outlet pipe provides an air outlet path for the paper bag during inspection, thereby preventing the paper bag from being broken due to excessive internal air pressure. When the paper bag is normally inflated, the third air valve is closed to prevent air leakage. Only when the air pressure in the paper bag reaches the point before the paper bag is broken, the third air valve is opened to reduce the air pressure in the paper bag and prevent the paper bag from being broken.

[0019] As a further improvement of the present invention, the air outlet pipe is located between the two elastic ropes, the air outlet pipe passes through the gap, the outer diameter of the air outlet pipe is equal to the outer diameter of the air inlet pipe, and the air outlet pipe is arranged in parallel with the air inlet pipe.

[0020] The beneficial effect of adopting the above technical solution is that the two pipes, the air outlet pipe and the air inlet pipe, can limit the shortest distance between the two rigid plates.

[0021] As a further improvement of the present invention, the second air valve limits the first air outlet to only allow air to be discharged outwards, and the third air valve is also a one-way valve, and the third air valve limits the second air inlet to only allow air to be discharged inwards.

[0022] The beneficial effect of adopting the above technical solution is that the existence of the third air valve will not interfere with the normal operation of the first air valve and the second air valve.

[0023] As a further improvement of the present invention, a handle is fixed to the air inlet pipe and the air outlet pipe. The handle is located above the air bag and a button for controlling the air compressor is provided on the handle.

[0024] The beneficial effects of adopting the above technical solution are: the handle is convenient for people to grasp and operate, the whole can be used as a handheld inspection tool, and the handle also limits the relative positions of the air inlet pipe and the air outlet pipe.

[0025] As a further improvement of the present invention, the axial direction of the inner air outlet is parallel to the length direction of the gap, and a rubber sealing ring is fixed on the side cloth and the end cloth of the airbag.

[0026] The beneficial effect of adopting the above technical solution is that the inner air outlet and the first air valve occupy a certain volume, which limits the direction of the inner air outlet to be parallel to the length direction of the paper bag opening. Because the space in the width direction of the paper bag opening is smaller, the layout of the inner air outlet and the first air valve cannot interfere with the airbag entering and exiting the paper bag. The rubber sealing ring can improve the airtightness between the outer surface of the airbag and the inner wall of the paper bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a perspective view of an embodiment of the present invention;

[0029] Figure 2 is a perspective view of an embodiment of the present invention;

[0030] Figure 3 is a perspective view of an embodiment of the present invention;

[0031] Figure 4 is a perspective view of an embodiment of the present invention;

[0032] Figure 5 It is an application schematic diagram of an implementation mode of the present invention.

[0033] 1-airbag; 101-top cloth; 102-side cloth; 103-bottom cloth; 104-end cloth; 2-inlet pipe; 201-first air inlet; 202-first air outlet; 203-inner air outlet; 3-outlet pipe; 301-second air outlet; 302-second air inlet; 4-rigid plate; 5-elastic rope; 6-handle; 7-first air valve; 8-second air valve; 9-third air valve; 10-gap; 11-paper bag. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with specific embodiments:

[0035] In order to achieve the purpose of the present invention, the airbag 1 is in a rectangular shape in the expanded state, and the vertical projection contour of the airbag 1 in the expanded state is consistent with the opening contour of the paper bag 11; the air pipe includes an air inlet pipe 2 that runs through the airbag 1; when the airbag 1 is inserted into the paper bag 11, the two ends of the air inlet pipe 2 include a first air inlet 201 located outside the paper bag 11, and also include a first air outlet 202 located inside the paper bag 11, the air inlet pipe 2 also has an inner air outlet 203 located inside the airbag 1, the inner air outlet 203 is connected to the first air valve 7, and the first air outlet 202 is connected to the second air valve 8; the first air inlet 201 is connected to an air compressor, the first air valve 7 and the second air valve 8 are self-powered pressure control valves, the first air valve 7 and the second air valve 8 are respectively a two-way valve and a one-way valve, and the pressure required to open the second air valve 8 is greater than the first air valve 7; the rigid plate 4 is attached to the top of the airbag 1, and the two rigid plates 4 are respectively arranged on both sides of the air inlet pipe 2 in a mirror-symmetrical manner.

[0036] The beneficial effect of adopting the above technical solution is: the air tightness test of the paper bag can reflect whether the overlapping bonding is complete and firm from another perspective. However, the paper bag has a large opening by nature, so the airbag is used to block the opening. The airbag itself is small in size when not inflated, which is convenient for entering the bag body and not easy to interfere with the opening of the bag body. After entering the bag body, the airbag begins to inflate and eventually blocks the mouth of the paper bag. The airbag has a relatively gentle effect, and can be airtight after contacting the paper bag, and is not easy to break the paper bag.

[0037] The rigid plate can strengthen the structural strength of the top of the airbag, ensuring that the top of the inflated airbag is basically horizontal, and then ensuring that the airbag fits better with the inner wall of the paper bag. The two rigid plates unfold after the airbag inflates, and the two rigid plates fold over each other after the airbag shrinks, thereby ensuring that the horizontal cross-sectional profile of the folded airbag becomes smaller, making it easier to enter and exit the opening of the paper bag.

[0038] An air compressor can be used as an air source to inflate or shrink the airbag and inflate the airtightness of the paper bag. The self-operated pressure control valve uses the principle of the pre-valve pressure of the working medium passing through the valve core, and uses the reaction force of the spring to balance. Since the opening pressures of the second air valve and the first air valve are different, the air compressor will first inflate the airbag when it continues to work. When the airbag is inflated, the air pressure in the airbag reaches a certain level before it will inflate the paper bag. At this time, the opening of the paper bag is just closed. The entire technical solution has a low cost and does not require expensive electrically controlled air valves. The airbag needs to switch between the two states of inflation and folding, so the first air valve is a two-way valve. This technical solution can use the repeated expansion and contraction of the airbag and the blowing of the air inlet pipe to achieve airtightness inspection of the bottom of each paper bag.

[0039] In some other embodiments of the present invention, the airbag 1 is made of a flexible material, and is composed of a top cloth 101, a bottom cloth 103, two side cloths 102, and two end cloths 104. The air intake pipe 2 passes through the top cloth 101 and the bottom cloth 103, and the outer wall is sealed and connected to the top cloth 101 and the bottom cloth 103. The rigid plate 4 is pasted on the top cloth 101, and the edge of the rigid plate 4 does not contact the edge of the top cloth 101.

[0040] The beneficial effects of adopting the above technical solution are: ensuring that the surface of the airbag after expansion is a rectangular parallelepiped as a whole. The shape and size of the top cloth are the same as the shape and size of the opening of the paper bag after expansion. The rigid plate does not contact the edge of the top cloth, ensuring that the rigid plate does not contact the inner wall of the paper bag to avoid damaging the paper bag, and at the same time facilitating the rapid entry and exit of the deflated airbag in and out of the paper bag.

[0041] In other embodiments of the present invention, the distance between the two end cloths 104 is greater than the distance between the two side cloths 102, the length direction of the rigid plate 4 is parallel to the length direction of the top cloth 101 itself; the distance from the rigid plate 4 to the nearest side cloth 102 is less than the distance from the rigid plate 4 to the nearest end cloth 104.

[0042] The beneficial effect of adopting the above technical solution is that the flexible top cloth acts as a flexible hinge connecting the rigid plate. When the paper bag is folded and opened, the opening length of the paper bag changes less, but the opening width changes more. The distances from the rigid plate to the edges of the top cloth are also different.

[0043] In some other embodiments of the present invention, an elastic rope 5 is commonly connected between the upper surfaces of the two rigid plates 4. When the upper surfaces of the two rigid plates 4 overlap in the same spatial plane, the elastic rope 5 is in a tensioned state.

[0044] The beneficial effect of adopting the above technical solution is that the elastic rope applies elastic force, so that the two rigid plates are folded only in a specified direction, so that the top cloth is folded in a V shape instead of an inverted V shape, and the airbag in the V-shaped folded state is easy to quickly enter the opening of the paper bag.

[0045] In other embodiments of the present invention, two elastic ropes 5 are arranged on both sides of the air intake pipe 2, and a gap 10 is formed between the two rigid plates 4. The gap 10 is equal to the outer diameter of the air intake pipe 2, and the length direction of the elastic rope 5 itself is perpendicular to the length direction of the gap 10 itself.

[0046] The beneficial effect of adopting the above technical solution is that the portion of the top surface in the gap acts as a flexible hinge, and the outer wall of the air intake pipe also limits the movement of the rigid plate to a certain extent, thereby preventing the rigid plate from swinging or bumping in an irregular manner.

[0047] In some other embodiments of the present invention, the air pipe also includes an air outlet pipe 3 that passes through the top cloth 101 and the bottom cloth 103 and the outer wall is sealed with the top cloth 101 and the bottom cloth 103; when the airbag 1 is inserted into the paper bag 11, both ends of the air outlet pipe 3 include a second air outlet 301 located outside the paper bag 11, and also include a second air inlet 302 located inside the paper bag 11, the second air inlet 302 is connected to the third air valve 9, the third air valve 9 is a self-powered pressure control valve, and the pressure required to open the third air valve 9 is greater than the second air valve 8.

[0048] The beneficial effect of adopting the above technical solution is that the air outlet pipe provides an air outlet path for the paper bag during inspection, thereby preventing the paper bag from being broken due to excessive internal air pressure. When the paper bag is normally inflated, the third air valve is closed to prevent air leakage. Only when the air pressure in the paper bag reaches the point before the paper bag is broken, the third air valve is opened to reduce the air pressure in the paper bag and prevent the paper bag from being broken.

[0049] In some other embodiments of the present invention, the air outlet pipe 3 is located between the two elastic ropes 5, the air outlet pipe 3 passes through the gap 10, the outer diameter of the air outlet pipe 3 is equal to the outer diameter of the air inlet pipe 2, and the air outlet pipe 3 is arranged in parallel with the air inlet pipe 2.

[0050] The beneficial effect of adopting the above technical solution is that the two pipes, the air outlet pipe and the air inlet pipe, can limit the shortest distance between the two rigid plates.

[0051] In some other embodiments of the present invention, the second air valve 8 limits the first air outlet 202 to only allow air to flow outwards, and the third air valve 9 is also a one-way valve, which limits the second air inlet 302 to only allow air to flow inwards.

[0052] The beneficial effect of adopting the above technical solution is that the existence of the third air valve will not interfere with the normal operation of the first air valve and the second air valve.

[0053] In some other embodiments of the present invention, a handle 6 is fixed to the air inlet pipe 2 and the air outlet pipe 3 . The handle 6 is located above the airbag 1 . A button for controlling the air compressor is provided on the handle 6 .

[0054] The beneficial effects of adopting the above technical solution are: the handle is convenient for people to grasp and operate, the whole can be used as a handheld inspection tool, and the handle also limits the relative positions of the air inlet pipe and the air outlet pipe.

[0055] In some other embodiments of the present invention, the axial direction of the inner air outlet 203 is parallel to the length direction of the gap 10 , and a rubber sealing ring is fixed on the side cloth 102 and the end cloth 104 of the airbag 1 .

[0056] The beneficial effect of adopting the above technical solution is that the inner air outlet and the first air valve occupy a certain volume, which limits the direction of the inner air outlet to be parallel to the length direction of the paper bag opening. Because the space in the width direction of the paper bag opening is smaller, the layout of the inner air outlet and the first air valve cannot interfere with the airbag entering and exiting the paper bag. The rubber sealing ring can improve the airtightness between the outer surface of the airbag and the inner wall of the paper bag.

[0057] In order to facilitate the display of internal structure, Figure 2 compared to Figure 1 In the figure, dotted lines are used to represent the obscured contours. Figure 4 compared to Figure 3 , the state of the rigid plate 4 is also represented by a dotted line. Figure 1 , Figure 2 , Figure 5 It's the effect of the airbag expanding. Figure 3 , Figure 4 This is the effect of the airbag 1 contracting. Figure 4 The middle rigid plate 4 has a vertical effect.

[0058] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An airbag type test fixture for air tightness of paper bags, characterized in that: include: The airbag is in a rectangular shape when inflated, and the vertical projection contour of the airbag in the inflated state coincides with the opening contour of the paper bag; The air pipe comprises an air inlet pipe penetrating the air bag; when the air bag is inserted into the paper bag, the two ends of the air inlet pipe comprise a first air inlet located outside the paper bag, and a first air outlet located inside the paper bag; the air inlet pipe further comprises an inner air outlet located inside the air bag, the inner air outlet is connected to a first air valve, and the first air outlet is connected to a second air valve; the first air inlet is connected to an air compressor, the first air valve and the second air valve are self-acting pressure control valves, the first air valve and the second air valve are two-way valves and one-way valves respectively, and the pressure required to open the second air valve is greater than that of the first air valve; A rigid plate is attached to the top of the air bag, and two rigid plates are arranged on both sides of the air intake pipe in a mirror-symmetrical manner; The airbag is made of a flexible material, and is composed of a top cloth, a bottom cloth, two side cloths, and two end cloths. The air inlet pipe passes through the top cloth and the bottom cloth, and the outer wall is sealed and connected to the top cloth and the bottom cloth. The rigid plate is attached to the top cloth, and the edge of the rigid plate does not contact the edge of the top cloth. The distance between the two end cloths is greater than the distance between the two side cloths, and the length direction of the rigid plate is parallel to the length direction of the top cloth itself; the distance from the rigid plate to the nearest side cloth is less than the distance from the rigid plate to the nearest end cloth; An elastic rope is commonly connected between the upper surfaces of the two rigid plates. When the upper surfaces of the two rigid plates overlap in the same spatial plane, the elastic rope is in a tensioned state.

2. The airbag type inspection tool for air tightness of paper bags according to claim 1, characterized in that: Two elastic ropes are arranged on both sides of the air intake pipe, and a gap is formed between the two rigid plates. The gap is equal to the outer diameter of the air intake pipe, and the length direction of the elastic rope itself is perpendicular to the length direction of the gap itself.

3. The airbag type inspection tool for air tightness of paper bags according to claim 2, characterized in that: The air pipe also includes an air outlet pipe that passes through the top cloth and the bottom cloth and whose outer wall is sealed with the top cloth and the bottom cloth; when the airbag is inserted into the paper bag, both ends of the air outlet pipe include a second air outlet located outside the paper bag, and also include a second air inlet located inside the paper bag, the second air inlet is connected to a third air valve, and the third air valve is a self-powered pressure control valve, and the pressure required to open the third air valve is greater than that of the second air valve.

4. The airbag type inspection tool for air tightness of paper bags according to claim 3 is characterized in that: The air outlet pipe is located between two elastic ropes, passes through the gap, the outer diameter of the air outlet pipe is equal to the outer diameter of the air inlet pipe, and the air outlet pipe is arranged in parallel with the air inlet pipe.

5. The airbag type inspection tool for air tightness of paper bags according to claim 3, characterized in that: The second air valve limits the first air outlet to only allow air to flow outwards, and the third air valve is also a one-way valve, and the third air valve limits the second air inlet to only allow air to flow inwards.

6. The airbag type inspection tool for air tightness of paper bags according to claim 3, characterized in that: The air inlet pipe and the air outlet pipe are commonly fixed with a handle, the handle is located above the air bag, and a button for controlling the air compressor is arranged on the handle.

7. The airbag type testing tool for air tightness of paper bags according to claim 3, characterized in that: The axial direction of the inner air outlet is parallel to the length direction of the gap, and a rubber sealing ring is fixed on the side cloth and the end cloth of the airbag.

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