Airtightness detection device and method for container with inner conical mouth

Abstract

The present invention discloses an airtightness detection device and method for a container with an inner conical surface at the mouth. The device includes a stand, a plurality of cylinder supports, a positioning seat, a pressure cap and an air control pipeline; the cylinder support includes a flange, a column, a support plate and two square tube beams; the column is coaxially welded with the flange, the flange is fixedly installed on the stand, and the square tube beam is installed on the top of the column perpendicular to the column; a U-shaped cylinder seat is installed at the cantilever end of the square tube beam; a cylinder is fixedly installed in the cylinder seat; a pressure cap is installed at the end of the piston rod of each cylinder, and a positioning seat is fixedly installed directly below each cylinder on the stand. The airtightness detection device for a container with an inner conical surface at the mouth of the present invention has a simple and compact structure, is convenient and quick to load and unload, and is simple to operate; it is provided with a plurality of detection stations, can be tested in groups and batches, and has high production efficiency; it adopts a cylinder clamping device with a guide frame, which is accurate in clamping, safe and reliable, saves time and effort, and can greatly reduce the labor intensity of workers.

Description

Technical Field

[0001] The invention relates to an airtightness detection device and method for a container with an inner conical mouth. Background Art

[0002] Generally speaking, a container refers to a basic device that is used to hold materials and is mainly composed of a shell. Common containers are mainly thin-walled shells with a cylindrical mouth at one end, such as bottles and cans. It must meet process requirements and ensure safe operation, including sufficient strength, rigidity and sealing. As one of the important indicators for testing container performance, sealing is generally equipped with special testing devices according to the use requirements and working environment of the container. Among them, airtight testing is more common. The airtight testing device often selects the positioning, clamping and sealing method according to the shape and mouth structure of the container. In order to improve work efficiency, reduce the labor intensity of workers, and meet the requirements of mass production, the manually installed clamping device is far from meeting the requirements of the inspection test efficiency. Especially for products with simple container geometry and good dimensional consistency, it is very necessary to invent a set of airtight testing devices that use pneumatic clamping to improve the inspection efficiency. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an airtightness detection device and method for a container with an inner conical mouth, which is simple to operate and has high detection production efficiency; it can also reduce the labor intensity of workers.

[0004] The technical solution adopted by the present invention is: an airtightness detection device for a container with an inner conical surface at the mouth, comprising a stand, a cylinder support, a positioning seat, a gland and an air control pipeline; the cylinder support comprises a flange, a column, a support plate and two square tube beams; the column and the flange are coaxially welded, the flange is fixedly installed on the stand, the square tube beam is perpendicular to the column and installed on the top of the column, and the two square tube beams are coaxial; a U-shaped cylinder seat is installed at the cantilever end of the square tube beam; a cylinder is fixedly installed in the cylinder seat; the cylinder is vertically arranged, a gland is installed at the end of the piston rod of each cylinder, and a positioning seat is fixedly installed directly below each cylinder on the stand;

[0005] The pressure cover includes a connecting part and a sealing part, which are coaxially arranged. The diameter of the connecting part is larger than that of the sealing part. The connecting part is connected to the cylinder piston rod. A radial hole is provided on the side of the connecting part, and an axial hole is provided on the end face of the sealing part. The axial hole is connected with the radial hole to form an air inlet hole, and the air control pipeline is connected to the air inlet hole, the rod cavity and the rodless cavity of the cylinder.

[0006] In the above-mentioned airtightness detection device for a container with an inner conical mouth, the upright column is made of a round steel pipe.

[0007] In the above-mentioned air tightness detection device for a container with an inner conical mouth, the stand comprises a top plate, two side panels, two hand-turn valve mounting plates, four long longitudinal pipes and a pressure regulating valve mounting plate;

[0008] The side panel includes a side panel and two side supporting feet. The two side supporting feet are arranged in parallel and connected by three transverse tubes. The three transverse tubes are respectively located at the top, middle and bottom of the side supporting feet; side panels are welded on the outer sides of the upper parts of the two side supporting feet, and the bottom edges of the side panels are flush with the bottom surface of the transverse tube in the middle of the side supporting feet. The side panels of the two side panels are arranged parallel and back to back; top panels are welded on the tops of the two side panels; a hand-turned valve mounting plate is respectively welded on the front and rear ends of the two side panels, the top surface of the hand-turned valve mounting plate contacts and is welded to the bottom surface of the top plate, and the bottom surface is flush with the bottom surface of the transverse tube in the middle of the side supporting feet; the valve mounting plate is U-shaped, and the two ends of the valve mounting plate are respectively mounted on the transverse tubes in the middle and bottom of one side panel, and the valve mounting plate is located below the bottom plate.

[0009] In the above-mentioned airtightness detection device for a container with an inner conical surface at the mouth, the front and rear ends of the two side panels are respectively connected by two long longitudinal tubes, the top surface of one of the two long longitudinal tubes is in contact with and welded to the bottom surface of the top plate, and the other is arranged near a transverse tube in the middle of the side support leg; the middle parts of the two long longitudinal tubes are connected by a transverse tube, and an intermediate support leg is respectively welded on the bottom surface of the middle part of the two long longitudinal tubes, the intermediate support leg is parallel to the side support leg and perpendicular to the top plate; the intermediate support leg and the bottom of the adjacent side support leg are connected by a small longitudinal tube, the small longitudinal tube is parallel to the long longitudinal tube, and the bottoms of the two small longitudinal tubes are connected by a transverse tube.

[0010] In the above-mentioned airtightness detection device for a container with an inner conical mouth, the side support legs and the middle support legs are tubular structures, and support legs are provided at the bottom of the side support legs and the middle support legs; a threaded hole is provided at the center of the support leg plate, and the threaded hole is screwed to the adjustable support leg, and a locking nut is provided on the adjustable support leg.

[0011] In the above-mentioned airtight detection device for a container with an inner conical surface at the mouth, a plurality of threaded holes I are provided on the upper end surface of the connecting part, which is connected to the piston rod by a plurality of screws; a plurality of threaded holes II are provided on the lower end surface of the connecting part, and a buffer pad is installed by screws; the outer end diameter of the radial hole is larger than the inner diameter, and an internal thread is provided at the outer end of the radial hole.

[0012] In the above-mentioned airtightness detection device for a container with an inner conical surface at the mouth, the positioning seat is disc-shaped, and a countersunk hole is processed on the upper end surface of the positioning seat. Two grooves are provided on the inner wall of the countersunk hole. A guide ring is installed in the groove at the upper part of the countersunk hole. The lower side surface of the groove at the bottom of the countersunk hole is flush with the bottom surface of the countersunk hole, and a buffer pad is installed in the groove at the bottom of the countersunk hole; a small through hole is provided in the center of the bottom surface of the positioning seat.

[0013] In the above-mentioned airtightness detection device for a container with an inner conical surface as the mouth, the air control pipeline includes a main pipe and a high-pressure air circuit and a low-pressure air circuit corresponding to each gland, the high-pressure pipeline and the low-pressure pipeline are respectively connected to an air outlet of a tee, and the air inlet is connected to the main pipe; the high-pressure air circuit includes a manual valve I, a high-precision pressure regulating valve, an air storage tank I, a plurality of hand-turned valves I and a plurality of speed regulating valves; the number of the hand-turned valves I and the speed regulating valves is the same as the number of cylinders; the manual valve I, the high-precision pressure regulating valve, and the air storage tank I are connected in sequence, the air inlet of the manual valve I is connected to the tee, and the air outlet of the air storage tank I is connected to the air inlet of each hand-turned valve I; one air outlet of the hand-turned valve I is connected to the speed regulating valve and then connected to the rodless chamber of the corresponding cylinder, and the other air outlet of the hand-turned valve I is connected to the rod chamber of the corresponding cylinder, so that the two air outlets of a hand-turned valve I are respectively connected to the rod chamber and the rodless chamber of the same cylinder;

[0014] The low-pressure pipeline includes a manual valve II, a low-precision pressure regulating valve, an air storage tank II, multiple hand-turned valves II and multiple pressure gauges, and the number of hand-turned valves II and pressure gauges is the same as that of cylinders; the manual valve II, the low-precision pressure regulating valve, and the air storage tank II are connected in sequence, the air inlet of the manual valve II is connected to a tee, and the air outlet of the air storage tank II is connected to the air inlet hole of each hand-turned valve II; an air outlet hole of each hand-turned valve II is connected to the radial hole on the corresponding gland through a pipeline, and a pressure gauge is provided on the pipeline.

[0015] In the above-mentioned air tightness detection device for a container with an inner conical surface as the mouth, a muffler is installed on the return air hole of the hand-turned valve I.

[0016] A method for detecting airtightness of a container with an inner conical surface at the mouth using the above-mentioned airtightness detection device for a container with an inner conical surface at the mouth comprises the following steps:

[0017] 1) Fix a test piece in each positioning seat with the opening of the test piece facing upwards;

[0018] 2) First, the piston rod of the air cylinder is controlled to move downward through the air control pipeline, so that the gland 12 presses the product tightly; then, the test piece is inflated through the air control pipeline and the gland, and the pressure is maintained when the test piece reaches the design pressure; after the pressure maintenance is completed, the test piece is depressurized;

[0019] 3) The piston rod of the air cylinder is controlled to move upward through the air control pipeline, so that the pressure cover 12 moves upward, the test piece is released, and the test piece is removed.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The airtightness detection device for a container with an inner conical mouth of the present invention has a simple and compact structure, adopts a modular design, has great combination flexibility, is convenient and quick to load and unload, and is simple to operate; it is provided with a plurality of detection stations, can perform group batch detection, and has high production efficiency; it adopts a cylinder clamping device with a guide frame, which has accurate clamping, is safe and reliable, saves time and effort, and can greatly reduce the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a front view of an airtightness detection device for a container with an inner conical mouth.

[0023] Figure 2 It is a left side view of the airtightness detection device for a container with an inner conical mouth according to the present invention.

[0024] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0025] Figure 4 for Figure 3 Middle NN section view.

[0026] Figure 5 It is a front view of the stand of the present invention.

[0027] Figure 6 It is a left side view of the stand of the present invention.

[0028] Figure 7 It is a top view of the stand of the present invention.

[0029] Figure 8 It is a front view of the cylinder support of the present invention.

[0030] Fig. 9 It is a top view of the cylinder support of the present invention.

[0031] Fig.10 It is a front view of the gas storage tank of the present invention.

[0032] Fig.11 It is a left side view of the gas storage tank of the present invention.

[0033] Fig.12 It is a cross-sectional view of the cylinder support of the present invention.

[0034] Fig.13 is a cross-sectional view of the gland of the present invention;

[0035] Fig.14 It is the principle diagram of the gas control pipeline of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] like Figure 1-14 As shown, the air tightness detection device for a container with an inner conical mouth of the present invention comprises a stand, a cylinder bracket, a positioning seat, a pressure cover and an air control pipeline.

[0038] The stand 1 is a long table-shaped frame operating table, including a top plate 101, two side panels, two hand-turn valve mounting plates 103, 9 horizontal pipes 104, four long vertical pipes 105, 6 support plates 106, 10 small vertical pipes 107, 2 middle support legs 108, a pressure regulating valve mounting plate 109, and 4 side support legs 110;

[0039] The side panel comprises a side panel 102 and two side legs 110, the two side legs 110 are arranged in parallel, and the two side legs 110 are connected by three transverse tubes 104, and the three transverse tubes 104 are respectively located at the top, middle and bottom of the side legs 110; the side panels 102 are welded on the outer sides of the upper parts of the two side legs 110, and the bottom edges of the side panels 102 are flush with the bottom surfaces of the transverse tubes 104 in the middle of the side legs 110, and the side panels of the two side panels are arranged in parallel and back to back; the top panels 101 are welded on the tops of the two side panels, and the front and rear ends of the two side panels are respectively connected by two long longitudinal tubes 105, and the two side panels are connected by two long longitudinal tubes 105. One of the long longitudinal tubes 105 is welded to the bottom of the top plate on the top surface, and the other is arranged near the horizontal tube 104 in the middle of the side leg 110; a hand-turned valve mounting plate 103 is welded to the front and rear ends of the two side panels respectively, the top surface of the hand-turned valve mounting plate 103 is welded to the bottom of the top plate and the bottom surface is flush with the bottom surface of the horizontal tube 104 in the middle of the side leg 110; the middle parts of the two long longitudinal tubes 105 are connected by a horizontal tube 104, and a middle leg 108 is welded to the bottom of the middle of the two long longitudinal tubes 105 respectively, and the middle leg 108 is parallel to the side leg 110 and perpendicular to the top plate 101. The middle leg 108 is connected to the bottom of the adjacent side leg 110 by a small longitudinal tube 107, and the small longitudinal tube 107 is parallel to the long longitudinal tube 105, and the bottoms of the two small longitudinal tubes 107 are connected by the horizontal tube 104. The bottoms of the middle leg 108 and the side leg 110 are both provided with a foot plate 106. The valve mounting plate 109 is U-shaped, and the two ends of the valve mounting plate 109 are respectively mounted on the middle and bottom transverse tubes 104 of a side panel, and the valve mounting plate 109 is located below the bottom plate. The side support legs 110 and the middle support legs 108 are tubular structures, and the bottoms of the side support legs and the middle support legs are both provided with support plates 106; a threaded hole is provided at the center of the support plate 106, and the threaded hole is screwed with the adjustable support leg 33, and a locking nut 34 is provided on the adjustable support leg; to adjust the level of the table and prevent loosening (see Figure 1 ).

[0040] The top plate 101 is a rectangular steel plate with 9 through holes. Each through hole has 4 threaded holes distributed around it for installation (see Figure 7). The three circular holes in the middle row are the mounting holes of the cylinder bracket 16. Each cylinder bracket 16 is mounted here with four nuts 43, four screws 44 and four spring washers 45. The remaining through holes are the mounting holes of the positioning seat 7. Each positioning seat 7 is mounted here with four spring washers 5 and four screws 6. The positioning seat 7 is equipped with a buffer pad 8 and a guide ring 9. Three groups of holes are drilled on each hand valve mounting plate 103 (one group for each cylinder bracket 16), which are the mounting holes of the hand valve I 41, the hand valve II and the pressure gauge 22. The pressure gauge 22 adopts a digital pressure gauge. The hand valve I 41 and the hand valve II are pressed and installed on the hand valve mounting plate 103 with locking nuts, and the digital pressure gauge 22 is fixed to the hand valve mounting plate 103 by three screws. Each hand-operated valve I 41 and each hand-operated valve II is fixed with a corresponding label by screws, wherein Up and Dn indicate the upward and downward movement of the cylinder, and In and Out indicate the inflation or deflation of the product. The bottom surface of the regulating valve mounting plate 109 is drilled with five groups of threaded holes for mounting the low-pressure regulating valve 30, the high-pressure regulating valve 32, the mounting holes of the labels 28 and 31, the manual valve 37 and the tee 35, and the tee 35 adopts a Y-type tee.

[0041] like Figure 8 , Fig. 9 As shown, the cylinder support 16 includes a flange 1601, a column 1602, a support plate 1603, two square tube beams 1604 and a cylinder seat 1605. The flange 1601 is installed at the mounting hole of the cylinder support 16 through four nuts 43, four screws 44 and four spring washers 45. The square tube beam 1604 is welded to the top of the column 1602 perpendicular to the column; a support plate 1603 is welded between the square tube beam 1604 and the column 1602. The two square tube beams are coaxial and symmetrical with respect to the center line of the column 1602. A U-shaped cylinder seat 1605 is welded to the cantilever end of the two square tube beams respectively; a cylinder is fixedly installed in the cylinder seat; the cylinder 17 is vertically arranged, and a gland 12 is installed at the end of the piston rod of each cylinder 17.

[0042] like Fig.12 As shown, the positioning seat 7 is disc-shaped, and a countersunk hole is processed on the upper end surface of the positioning seat 7. Two grooves are arranged on the inner side wall of the countersunk hole. A guide ring 9 is installed in the groove on the upper part of the countersunk hole. The lower side of the groove at the bottom of the countersunk hole is flush with the bottom surface of the countersunk hole. A buffer pad 8 is installed in the groove at the bottom of the countersunk hole. A small through hole is arranged in the center of the bottom surface of the positioning seat 7, which is an air pressure balance hole to reduce the resistance when the test piece is pressed in or pulled out. There are 4 threaded holes evenly distributed on the bottom surface of the positioning seat 7 for fixing the positioning seat 7. The buffer pad 8 is an annular rubber part, which plays a role of buffering and protecting the product when the axial compression is excessive. The guide ring 9 is an O-shaped rubber ring, so that the product does not directly contact the positioning seat 7 when it is installed, to prevent scratches on the product, and can also guide the product during compression and have appropriate adjustment room.

[0043] like Fig.13As shown, the gland 12 includes a connecting part and a sealing part, which are coaxially arranged. The diameter of the connecting part is larger than that of the sealing part. A plurality of threaded holes I are arranged on the upper end surface of the connecting part, and the connecting part is connected to the piston rod by a plurality of screws. A plurality of threaded holes II are arranged on the lower end surface of the connecting part, and a buffer pad 11 is installed by screws. A radial hole is arranged on the side surface of the connecting part, and the outer end diameter of the radial hole is larger than the inner diameter. An internal thread is arranged at the outer end of the radial hole, which is used to connect the air control pipeline. The sealing part is conical, and an axial hole is arranged on the end surface of the sealing part. The axial hole is connected with the radial hole to form an air inlet. Two annular grooves are arranged on the side surface of the sealing part, and an O-ring 10 is arranged in the lower annular groove, and a buffer pad 11 is arranged in the upper annular groove. The buffer pad 11 is fixed to the lower end surface of the connecting part by four screws 14. The buffer pad 11 plays a role of buffering and protecting the product when the axial compression is excessive. The O-ring 10 becomes elliptical after being pressed into the bottle mouth and plays a sealing role.

[0044] like Fig.14 As shown, the air control pipeline includes a main pipe and a high-pressure air circuit H and a low-pressure air circuit L corresponding to each gland. The high-pressure pipeline H and the low-pressure pipeline L are respectively connected to an air outlet of the tee 35, and the air inlet is connected to the main pipe. The high-pressure air circuit H includes a manual valve I 37, a high-precision pressure regulating valve 32, an air storage tank I 24, six hand-turned valves I 41 and six speed regulating valves 46 (the number of hand-turned valves I41 and speed regulating valves 46 is consistent with the number of cylinders 17). The manual valve I 37, the high-precision pressure regulating valve 32, and the air storage tank I 24 are connected in sequence, and the air inlet of the manual valve I 37 is connected to the tee. The air storage tank I 24 is provided with three air outlets, and each air outlet is connected to the air inlet of two hand-turned valves I 41 through a Y-type tee I 38, so as to realize the connection between the air outlet of the air storage tank I 24 and the air inlet of each hand-turned valve I 41. One air outlet of each hand-turned valve I is connected to the rodless chamber of the cylinder after the speed regulating valve, and the other air outlet is connected to the rod chamber of the cylinder, and the two air outlets of each hand-turned valve I are respectively connected to the rodless chamber and the rod chamber of the same cylinder 17.

[0045] The low-pressure pipeline L includes a manual valve II371, a low-precision pressure regulating valve 30, an air storage tank II241, six hand-operated valves II411 and six pressure gauges 22 (the number of hand-operated valves II411 and pressure gauges 22 is consistent with the number of cylinders 17). The manual valve II371, the low-precision pressure regulating valve 30 and the air storage tank II241 are connected in sequence, and the air inlet of the manual valve II371 is connected to the tee 35. The air storage tank II241 is provided with three air outlets, each of which is connected to the air inlet holes of two hand-operated valves II411 through a Y-type tee II, so as to realize the connection between the air outlet of the air storage tank II241 and the air inlet hole of each hand-operated valve II411. One air outlet of each hand-operated valve II411 is connected to the radial hole on the corresponding gland 12 through a pipeline, and the pipeline is provided with a pressure gauge 22, and a three-way pressure gauge joint and a sealing gasket 23 are installed at the joint of the pressure gauge 22. The other air outlet of the hand-operated valve II411 is normally closed.

[0046] The gas tank I 24 and the gas tank II 241 have the same structure. Fig.10 , Fig.11 As shown, the gas tank I 24 and the gas tank II 241 include a gas tank and two U-shaped brackets welded on the outer wall of the gas tank, and the U-shaped bracket is formed by bending a steel plate. The gas tank is a stainless steel weldment, which plays the role of gas storage and buffering. It is installed in the stand 1, and the air inlet with tapered tube internal thread faces horizontally outward and is connected to the threaded straight joint 15. There are two mounting holes at the bottom of the U-shaped bracket, which is fixed to the two middle horizontal pipes 104 by bolts 26 and nuts 27. A joint with internal thread is welded to the bottom of the middle of the gas tank, and a hexagonal plug 25 is screwed on it for tank cleaning and drainage, and is usually in a blocked state. Three joints with tapered tube internal thread are evenly welded on the upper surface of the gas tank, which are used to connect the Y-type tee I38 or Y-type tee II.

[0047] The airtightness detection method of a container with an inner conical mouth of the present invention comprises the following steps:

[0048] 1) Before the test, check each gas circuit to ensure reliable connection and fix a test piece in each positioning seat.

[0049] 2) During the test, first set the high-pressure precision pressure regulating valve 32 and the low-pressure precision pressure regulating valve 30 to the pressure required for the test, and then turn the knob of the manual valve 37 to the open position. At this time, the external high-pressure gas source P is decompressed by the high / low precision pressure regulating valve 32 / 30 and then inflated into the gas storage tank 24. After the gas storage tank 24 is full of gas, turn the handle of the hand valve 41 at the high-pressure gas line H to D n Place (i.e. Fig.14 The gas in the high-pressure gas storage tank 24 is divided into 6 gas paths through the 3 Y-type tees I 38 installed on the tank body and transported to the corresponding 6 manual valves I41. The gas is controlled by the P H Mouth (air inlet) → B H The gas in the rod chamber of cylinder 17 flows from port K2 (cylinder air inlet Ⅱ) to port A1 (cylinder air inlet Ⅱ) and then flows to port K2 (cylinder air inlet Ⅱ) to port A2 (cylinder air inlet Ⅱ). H Mouth (vent) → R H The gas is discharged through the muffler 20, and the gas in the rodless chamber pushes the piston of the cylinder 17 downward, so that the gland 12 presses the test piece.

[0050] Next, turn the handle of the hand-operated valve II411 at the low-pressure gas line L to In (i.e. Fig.14 c position), the gas is P L →B L → Digital pressure gauge 22 → P1 port enters gland 12 to inflate and maintain pressure on the product. After the pressure maintenance is completed, turn the hand valve II411 at L in the low-pressure gas line to Out (i.e. Fig.14 At the d position in the middle), the B of the hand-operated valve II 411 L port (air outlet hole) → R L port (air return hole) is conducted, and the gas in the test piece and the test pipe section is discharged through the muffler 20, and the product is depressurized. At the same time, the P of the hand-operated valve II 411 L (air inlet hole) → A L (air outlet hole) is conducted. Since A L is a normally closed port, the air supply port P of the air storage tank is closed. Then, turn the handle of the hand-operated valve 41 at the high-pressure gas path H to the Up position (i.e., L at the b position in the middle), and the gas goes from the P Fig.14 port → A H port → K2 port and enters the rodless cavity of the cylinder 17; at the same time, the K1 port of the upper cavity of the cylinder 17 → the speed control valve 46 check valve pipeline → B H port → R H port is conducted, and the gas in the rodless cavity of the cylinder 17 is discharged through the muffler 20 to be depressurized, and the gas in the lower cavity causes the piston rod of the cylinder 17 to move upward, and the gland 12 moves upward accordingly, loosening the test piece and removing the test piece. To prevent the gas leakage of the air storage tank 24 in the non-working state and protect the cylinder piston, in the normal state, turn the handles 25 and 251 of the hand-operated valve I 41 and the hand-operated valve II 411 to the middle position, close all the air ports, and complete the entire test operation process.​​

Claims

1. An airtightness detection device for a container with an inner conical surface at the mouth, comprising a stand, a plurality of cylinder brackets, a positioning seat, a gland and an air control pipeline; its characteristics are: The cylinder bracket includes a flange, a column, a support plate and two square tube beams; the column and the flange are coaxially welded, the flange is fixedly installed on the stand, the square tube beam is perpendicular to the column and installed on the top of the column, and the two square tube beams are coaxial; a U-shaped cylinder seat is installed at the cantilever end of the square tube beam; a cylinder is fixedly installed in the cylinder seat; the cylinder is vertically arranged, a gland is installed at the end of the piston rod of each cylinder, and a positioning seat is fixedly installed directly below each cylinder on the stand; The gland includes a connecting part and a sealing part, which are coaxially arranged. The diameter of the connecting part is larger than that of the sealing part. The connecting part is connected to the piston rod of the cylinder. A radial hole is provided on the side of the connecting part, and an axial hole is provided on the end surface of the sealing part. The axial hole is connected with the radial hole to form an air inlet hole. The air control pipeline is connected with the air inlet hole, the rod cavity and the rodless cavity of the cylinder. The stand comprises a top plate, two side panels, two hand-turn valve mounting plates, four long longitudinal pipes and a pressure regulating valve mounting plate; The side panel comprises a side panel and two side legs, the two side legs are arranged in parallel, and the two side legs are connected by three transverse tubes, and the three transverse tubes are respectively located at the top, middle and bottom of the side legs; side panels are welded on the outer sides of the upper parts of the two side legs, the bottom edges of the side panels are flush with the bottom surface of the transverse tube in the middle of the side legs, and the side panels of the two side panels are arranged parallel and back to back; top panels are welded on the tops of the two side panels; a hand-turned valve mounting plate is respectively welded at the front and rear ends of the two side panels, the top surface of the hand-turned valve mounting plate contacts and is welded to the bottom surface of the top plate, and the bottom surface is flush with the bottom surface of the transverse tube in the middle of the side legs; the valve mounting plate is U-shaped, and the two ends of the valve mounting plate are respectively mounted on the transverse tubes in the middle and bottom of one side panel, and the valve mounting plate is located below the bottom plate; The air control pipeline includes a main pipe and a high-pressure air circuit and a low-pressure air circuit corresponding to each gland, the high-pressure pipeline and the low-pressure pipeline are respectively connected to an air outlet of a tee, and the air inlet is connected to the main pipe; the high-pressure air circuit includes a manual valve I, a high-precision pressure regulating valve, an air storage tank I, a plurality of hand-turned valves I and a plurality of speed regulating valves; the number of the hand-turned valves I and the speed regulating valves is the same as the number of the cylinders; the manual valve I, the high-precision pressure regulating valve, and the air storage tank I are connected in sequence, the air inlet of the manual valve I is connected to the tee, and the air outlet of the air storage tank I is connected to the air inlet of each hand-turned valve I; one air outlet of the hand-turned valve I is connected to the rodless chamber of the corresponding cylinder after being connected to the speed regulating valve, and the other air outlet of the hand-turned valve I is connected to the rod chamber of the corresponding cylinder, so that the two air outlets of a hand-turned valve I are respectively connected to the rod chamber and the rodless chamber of the same cylinder; The low-pressure pipeline includes a manual valve II, a low-precision pressure regulating valve, an air storage tank II, multiple hand-turned valves II and multiple pressure gauges, and the number of hand-turned valves II and pressure gauges is the same as that of cylinders; the manual valve II, the low-precision pressure regulating valve, and the air storage tank II are connected in sequence, the air inlet of the manual valve II is connected to a tee, and the air outlet of the air storage tank II is connected to the air inlet hole of each hand-turned valve II; an air outlet hole of each hand-turned valve II is connected to the radial hole on the corresponding gland through a pipeline, and a pressure gauge is provided on the pipeline.

2. The airtightness detection device for a container with an inner conical mouth according to claim 1 is characterized in that: The upright column is made of round steel pipe.

3. The airtightness detection device for a container with an inner conical mouth according to claim 1 is characterized in that: The front and rear ends of the two side panels are respectively connected by two long longitudinal tubes, the top surface of one of the two long longitudinal tubes is in contact with and welded to the bottom surface of the top plate, and the other is arranged near a transverse tube in the middle of the side support leg; the middle parts of the two long longitudinal tubes are connected by a transverse tube, and an intermediate support leg is respectively welded on the bottom surface of the middle part of the two long longitudinal tubes, the intermediate support leg is parallel to the side support leg and perpendicular to the top plate; the intermediate support leg and the bottom of the adjacent side support leg are connected by a small longitudinal tube, the small longitudinal tube is parallel to the long longitudinal tube, and the bottoms of the two small longitudinal tubes are connected by a transverse tube.

4. The airtightness detection device for a container with an inner conical mouth according to claim 3 is characterized in that: The side support legs and the middle support legs are tubular structures, and support legs are provided at the bottom of the side support legs and the middle support legs; a threaded hole is provided at the center of the support legs, and the threaded hole is screwed with the adjustable support legs, and a locking nut is provided on the adjustable support legs.

5. The airtightness detection device for a container with an inner conical mouth according to claim 1 is characterized in that: The upper end surface of the connecting part is provided with a plurality of threaded holes I, which are connected to the piston rod through a plurality of screws; the lower end surface of the connecting part is provided with a plurality of threaded holes II, and a buffer pad is installed through the screws; the outer end diameter of the radial hole is larger than the inner diameter, and an internal thread is provided at the outer end of the radial hole.

6. The airtightness detection device for a container with an inner conical mouth according to claim 1 is characterized in that: The positioning seat is disc-shaped, with a countersunk hole processed on the upper end face of the positioning seat, two grooves arranged on the inner wall of the countersunk hole, a guide ring installed in the groove at the upper part of the countersunk hole, the lower side of the groove at the bottom of the countersunk hole is flush with the bottom surface of the countersunk hole, and a buffer pad is installed in the groove at the bottom of the countersunk hole; a small through hole is arranged in the center of the bottom surface of the positioning seat.

7. The airtightness detection device for a container with an inner conical mouth according to claim 1 is characterized in that: A muffler is installed on the air return hole of the hand-turned valve 1.

8. A method for detecting airtightness of a container with an inner conical surface at the mouth, using the airtightness detection device for a container with an inner conical surface at the mouth as claimed in any one of claims 1 to 7, comprising the following steps: 1) Fix a test piece in each positioning seat with the opening of the test piece facing upwards; 2) First, the piston rod of the air cylinder is controlled to move downward through the air control pipeline, so that the gland presses the product tightly; then, the test piece is inflated through the air control pipeline and the gland, and the pressure is maintained when the test piece reaches the design pressure; after the pressure maintenance is completed, the test piece is depressurized; 3) Control the piston rod of the air cylinder upward through the air control pipeline, so that the pressure cover moves upward, loosens the test piece, and removes the test piece.

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