CN220366974U

CN220366974U - Airtight detection device of container with inner conical surface at mouth

Info

Publication number: CN220366974U
Application number: CN202321414874.2U
Authority: CN
Inventors: 李崇华; 闫胜利; 秦志刚; 廖敏昱; 文阳飞; 王敏辉
Original assignee: Jiangnan Industries Group Co Ltd
Current assignee: Jiangnan Industries Group Co Ltd
Priority date: 2023-06-05
Filing date: 2023-06-05
Publication date: 2024-01-19
Anticipated expiration: 2033-06-05

Abstract

The utility model discloses an airtight detection device for an internal conical container with an opening part, which comprises a bench, a plurality of cylinder brackets, a positioning seat, a gland and a pneumatic control pipeline; the cylinder bracket comprises a flange, an upright post, a supporting plate and two square tube beams; the upright post is coaxially welded with the flange, the flange is fixedly arranged on the bench, and the square tube beam is perpendicular to the upright post and is arranged at the top of the upright post; a U-shaped cylinder seat is arranged at the cantilever end of the square pipe beam; a cylinder is fixedly arranged in the cylinder seat; the end part of the piston rod of each cylinder is provided with a gland, and a positioning seat is fixedly arranged under each cylinder on the rack. The airtight detection device for the container with the inner conical surface at the mouth part has the advantages of simple and compact structure, convenient and quick assembly and disassembly and simple operation; the device is provided with a plurality of detection stations, can detect in groups in batches, and has high production efficiency; the cylinder clamping device with the guide frame is adopted, so that the clamping is accurate, safe and reliable, time-saving and labor-saving, and the labor intensity of workers can be greatly reduced.

Description

Airtight detection device of container with inner conical surface at mouth

Technical Field

The utility model relates to an airtight detection device for a container with an inner conical surface at the mouth.

Background

Generally, a container is a basic device for containing materials and mainly comprises a shell, and a common container mainly comprises a thin-wall shell with one end of the shell being a cylindrical opening part, such as a bottle, a tank and the like. It needs to meet the technological requirements, and ensures the operation safety, including enough strength, rigidity, tightness and the like. Tightness is one of the important indicators for testing the performance of containers, and is generally equipped with special detection devices according to the use requirements of the container and the working environment, wherein the detection in airtight is common. The airtight detection device usually selects a positioning, clamping and sealing mode according to the appearance and the opening structure of the container. In order to improve the working efficiency, lighten the labor intensity of workers, meet the requirement of batch production, and the manual installation of the compacting device can not meet the requirement of detection test efficiency. In particular, for products with simple container geometry and good dimensional consistency, it is necessary to invent a set of airtight detection device adopting pneumatic compression to improve detection efficiency.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the airtight detection device which is simple to operate and has high detection production efficiency, wherein the mouth part is the inner conical container; it can also reduce the labor intensity of workers.

The technical scheme adopted by the utility model is as follows: an airtight detection device for an internal conical container at the mouth part comprises a bench, a cylinder bracket, a positioning seat, a gland and a pneumatic control pipeline; the cylinder bracket comprises a flange, an upright post, a supporting plate and two square tube beams; the upright post and the flange are coaxially welded, the flange is fixedly arranged on the bench, the square tube beam is perpendicular to the upright post and is arranged at the top of the upright post, and the two square tubes Liang Tongzhou; a U-shaped cylinder seat is arranged at the cantilever end of the square pipe beam; a cylinder is fixedly arranged in the cylinder seat; the cylinders are vertically arranged, a gland is arranged at the end part of a piston rod of each cylinder, and a positioning seat is fixedly arranged right below each cylinder on the rack;

the gland includes connecting portion and sealing portion, and connecting portion and sealing portion coaxial setting, and connecting portion diameter is greater than sealing portion, and connecting portion are connected with the cylinder piston rod, and the connecting portion side is equipped with radial hole, is equipped with the axial hole on the sealing portion terminal surface, and axial hole and radial hole intercommunication form the inlet port, and pneumatic control pipeline is connected with the inlet port, the pole chamber and the no pole chamber of having of cylinder.

In the airtight detection device with the inner conical container at the mouth part, the upright post is made of round steel pipes.

In the airtight detection device with the inner conical container at the mouth part, the rack comprises a top plate, two side panels, two rotary valve mounting plates, four long longitudinal pipes and a pressure regulating valve mounting plate;

the side panel comprises a side plate and two side support legs, wherein the two side support legs are arranged in parallel, the two side support legs are connected through three transverse pipes, and the three transverse pipes are respectively positioned at the top, the middle and the bottom of the side support legs; the outer side surfaces of the upper parts of the two side support legs are welded with side plates, the bottom edges of the side plates are parallel and level with the bottom surface of the middle transverse tube of the side support legs, and the side plates of the two side panels are arranged in parallel and opposite; the top of the two side panels is welded with a top plate; the front end and the rear end of the two side panels are respectively welded with a hand-operated valve mounting plate, the top surface of the hand-operated valve mounting plate is contacted with the bottom surface of the top plate and welded, and the bottom surface is flush with the bottom surface of the middle transverse tube of the side support leg; the valve mounting plate is U-shaped, two ends of the valve mounting plate are respectively arranged on the middle part of one side panel and the transverse pipe at the bottom, and the valve mounting plate is positioned below the bottom plate.

In the airtight detection device with the inner conical container at the mouth part, the front ends and the rear ends of the two side panels are respectively connected through two long longitudinal pipes, one top surface of the two long longitudinal pipes is contacted with the bottom surface of the top plate and welded, and the other transverse pipe is arranged close to the middle part of the side support leg; the middle parts of the two long longitudinal pipes are connected through a transverse pipe, the bottom surfaces of the middle parts of the two long longitudinal pipes are respectively welded with a middle supporting leg, and the middle supporting legs are parallel to the side supporting legs and perpendicular to the top plate; the middle support leg is connected with the bottoms of the adjacent side support legs through small longitudinal pipes, the small longitudinal pipes are parallel to the long longitudinal pipes, and the bottoms of the two small longitudinal pipes are connected through transverse pipes.

In the airtight detection device with the mouth part being the inner conical container, the side support legs and the middle support legs are of tubular structures, and foot supporting plates are arranged at the bottoms of the side support legs and the middle support legs; the center of the supporting leg plate is provided with a threaded hole which is in threaded connection with an adjustable supporting leg, and the adjustable supporting leg is provided with a locking nut.

In the airtight detection device with the inner conical container at the mouth part, a plurality of threaded holes I are formed in the upper end face of the connecting part and are connected with the piston rod through a plurality of screws; the lower end face of the connecting part is provided with a plurality of threaded holes II, and a buffer cushion is arranged through screws; the diameter of the outer end of the radial hole is larger than the diameter of the inner end of the radial hole, and the outer end of the radial hole is provided with internal threads.

In the airtight detection device with the inner conical container at the mouth part, the positioning seat is disc-shaped, the upper end surface of the positioning seat is provided with a counter bore, the inner side wall of the counter bore is provided with two grooves, a guide ring is arranged in the groove at the upper part of the counter bore, the lower side surface of the groove at the bottom of the counter bore is level with the bottom surface of the counter bore, and a buffer pad is arranged in the groove at the bottom of the counter bore; the center of the bottom surface of the positioning seat is provided with a small through hole.

In the airtight detection device with the inner conical container at the mouth part, the pneumatic control pipeline comprises a main pipe, a high-pressure gas path and a low-pressure gas path corresponding to each gland, the high-pressure pipeline and the low-pressure pipeline are respectively connected with a gas outlet of a tee joint, and the gas inlet is connected to the main pipe; the high-pressure gas path comprises a manual valve I, a high-precision pressure regulating valve, a gas storage tank I, a plurality of hand-rotating valves I and a plurality of speed regulating valves; the number of the hand-rotating valves I and the speed regulating valves is the same as that of the air cylinders; the manual valve I, the high-precision pressure regulating valve and the air storage tank I are sequentially connected, an air inlet of the manual valve I is connected with a tee joint, and an air outlet of the air storage tank I is connected with an air inlet of each manual rotary valve I; one air outlet hole of the hand-rotating valve I is connected with the speed regulating valve and then is connected with the rodless cavity of the corresponding air cylinder, and the other air outlet hole of the hand-rotating valve I is connected with the rod cavity of the corresponding air cylinder, so that the two air outlet holes of the hand-rotating valve I are respectively connected with the rod cavity and the rodless cavity of the same air cylinder;

the low-pressure pipeline comprises a manual valve II, a low-precision pressure regulating valve, an air storage tank II, a plurality of hand-rotating valves II and a plurality of pressure gauges, wherein the number of the hand-rotating valves II and the number of the pressure gauges are the same as that of the air cylinders; the manual valve II, the low-precision pressure regulating valve and the air storage tank II are sequentially connected, an air inlet of the manual valve II is connected with a tee joint, and an air outlet of the air storage tank II is connected with an air inlet of each hand-rotating valve II; an air outlet hole of each hand-operated valve II is connected with a radial hole on the corresponding pressure cover through a pipeline, and a pressure gauge is arranged on the pipeline.

In the airtight detection device with the inner conical container at the mouth part, a muffler is arranged on the air return hole of the hand-rotating valve I.

Compared with the prior art, the utility model has the beneficial effects that:

the airtight detection device with the inner conical container at the mouth part has a simple and compact structure, adopts a modularized design, has high combination flexibility, is convenient and quick to assemble and disassemble, and is simple to operate; the device is provided with a plurality of detection stations, can detect in groups in batches, and has high production efficiency; the cylinder clamping device with the guide frame is adopted, so that the clamping is accurate, safe and reliable, time-saving and labor-saving, and the labor intensity of workers can be greatly reduced.

Drawings

Fig. 1 is a front view of the present utility model.

Fig. 2 is a left side view of the present utility model.

Fig. 3 is an enlarged view at a in fig. 1.

Fig. 4 is a cross-sectional view of N-N in fig. 3.

Fig. 5 is a front view of the stand of the present utility model.

Fig. 6 is a left side view of the stand of the present utility model.

Fig. 7 is a top view of the gantry of the present utility model.

Fig. 8 is a front view of the cylinder bracket of the present utility model.

Fig. 9 is a top view of the cylinder bracket of the present utility model.

Fig. 10 is a front view of the air tank of the present utility model.

Fig. 11 is a left side view of the air tank of the present utility model.

Fig. 12 is a cross-sectional view of the cylinder bracket of the present utility model.

FIG. 13 is a cross-sectional view of a gland of the present utility model;

fig. 14 is a schematic diagram of a pneumatic control line of the present utility model.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in figures 1-14, the airtight detection device for the container with the inner conical surface mouth part comprises a bench, a cylinder bracket, a positioning seat, a gland and a pneumatic control pipeline.

The rack 1 is a long table-shaped frame operation table and comprises a top plate 101, two side panels, two rotary valve mounting plates 103, 9 transverse pipes 104, four long longitudinal pipes 105, 6 support leg plates 106, 10 small longitudinal pipes 107, 2 middle support legs 108, a pressure regulating valve mounting plate 109 and 4 side support legs 110;

the side panel comprises a side plate 102 and two side support legs 110, wherein the two side support legs 110 are arranged in parallel, the two side support legs 110 are connected through three transverse pipes 104, and the three transverse pipes 104 are respectively positioned at the top, the middle and the bottom of the side support legs 110; the upper outer side surfaces of the two side support legs 110 are welded with side plates 102, the bottom edges of the side plates 102 are level with the bottom surface of the middle transverse tube 104 of the side support legs 110, and the side plates of the two side plates are arranged in parallel and opposite; the top of the two side panels is welded with a top plate 101, the front ends and the rear ends of the two side panels are respectively connected through two long longitudinal pipes 105, one top surface of the two long longitudinal pipes 105 is contacted with the bottom surface of the top plate and welded, and the other side is arranged close to a transverse pipe 104 in the middle of a side support leg 110; the front end and the rear end of the two side panels are respectively welded with a hand-operated valve mounting plate 103, the top surface of the hand-operated valve mounting plate 103 is contacted with the bottom surface of the top plate and welded, and the bottom surface is flush with the bottom surface of the middle transverse tube 104 of the side support leg 110; the middle parts of the two long longitudinal pipes 105 are connected through a transverse pipe 104, the bottom surfaces of the middle parts of the two long longitudinal pipes 105 are respectively welded with a middle support leg 108, and the middle support legs 108 are parallel to the side support legs 110 and perpendicular to the top plate 101. The middle support leg 108 is connected with the bottoms of the adjacent side support legs 110 through small longitudinal pipes 107, the small longitudinal pipes 107 are parallel to the long longitudinal pipes 105, and the bottoms of the two small longitudinal pipes 107 are connected through transverse pipes 104. Foot plates 106 are provided at the bottoms of the medial leg 108 and the lateral leg 110. The valve mounting plate 109 is U-shaped, two ends of the valve mounting plate 109 are respectively arranged on the transverse pipes 104 at the middle and bottom of one side panel, and the valve mounting plate 109 is arranged below the bottom plate. The side support legs 110 and the middle support legs 108 are of tubular structures, and foot plates 106 are arranged at the bottoms of the side support legs and the middle support legs; a threaded hole is formed in the center of the supporting foot plate 106 and is in threaded connection with an adjustable supporting foot 33, and a locking nut 34 is arranged on the adjustable supporting foot; to adjust the table level and prevent loosening (see fig. 1).

The top plate 101 is a rectangular steel plate, 9 through holes are formed in the top plate, and 4 threaded holes are uniformly distributed in the periphery of each through hole for installation (see fig. 7). The middle row of 3 circular holes are mounting holes for the cylinder brackets 16, to which 4 nuts 43, 4 screws 44 and 4 spring washers 45 are mounted for each cylinder bracket 16. The rest through holes are mounting holes of the positioning seats 7, each positioning seat 7 is respectively provided with 4 elastic pads 5 and 4 screws 6, and a buffer cushion 8 and a guide ring 9 are arranged in each positioning seat 7. Each hand-operated valve mounting plate 103 is provided with 3 groups of holes (one group corresponds to each cylinder bracket 16), which are respectively the mounting holes of the hand-operated valve I41, the hand-operated valve II and the pressure gauge 22, and the pressure gauge 22 adopts a digital display pressure gauge. The hand-rotating valve I41 and the hand-rotating valve II are installed on the hand-rotating valve mounting plate 103 in a pressing mode through locking nuts, and the digital display pressure gauge 22 is fixed on the hand-rotating valve mounting plate 103 through 3 screws. Corresponding labels are fixed on each hand-rotating valve I41 and each hand-rotating valve II by bolts, wherein Up and Dn represent upward and downward movements of the air cylinder, and In and Out represent inflation or deflation of the product. Five groups of threaded holes are drilled on the bottom surface of the regulating valve mounting plate 109 and are used for mounting the mounting holes of the low-pressure regulating valve 30, the high-pressure regulating valve 32, the labels 28 and 31, the manual valve 37 and the tee joint 35, and the tee joint 35 adopts a Y-shaped tee joint.

As shown in fig. 8 and 9, the cylinder bracket 16 includes a flange 1601, a column 1602, a support plate 1603, two square tube beams 1604, and a cylinder block 1605. The flange 1601 is mounted at the mounting hole of the cylinder bracket 16 by 4 nuts 43, 4 screws 44 and 4 spring washers 45. The square tube beam 1604 is welded on the top of the upright 1602 perpendicular to the upright; the square beams are coaxial and symmetrical about the centerline of the column 1602. The cantilever ends of the two square tubular beams are respectively welded with a U-shaped cylinder seat 1605; a cylinder is fixedly arranged in the cylinder seat; the cylinders 17 are arranged vertically, and a gland 12 is arranged at the end of a piston rod of each cylinder 17.

As shown in fig. 12, the positioning seat 7 is disc-shaped, a counter bore is machined in the upper end face of the positioning seat 7, two grooves are formed in the inner side wall of the counter bore, a guide ring 9 is arranged in the groove in the upper portion of the counter bore, the lower side face of the groove in the bottom of the counter bore is flush with the bottom face of the counter bore, and a buffer cushion 8 is arranged in the groove in the bottom of the counter bore. The center of the bottom surface of the positioning seat 7 is provided with a small through hole which is an air pressure balance hole so as to reduce the resistance of the test piece during pressing in or pulling out. 4 threaded holes are uniformly distributed on the bottom surface of the positioning seat 7 for fixing the positioning seat 7. The cushion pad 8 is an annular rubber member and plays a role in buffering and protecting products when excessive axial compression occurs. The guide ring 9 is an O-shaped rubber ring, so that the product is not in direct contact with the positioning seat 7 when being loaded, the product is prevented from being scratched, and the product can be guided and adjusted in a proper adjustment range when being pressed.

As shown in fig. 13, the gland 12 includes a connecting portion and a sealing portion, the connecting portion and the sealing portion are coaxially disposed, the diameter of the connecting portion is larger than that of the sealing portion, a plurality of threaded holes I are formed in the upper end face of the connecting portion, and the connecting portion is connected with the piston rod through a plurality of screws. The lower end face of the connecting part is provided with a plurality of threaded holes II, and a buffer pad 11 is installed through screws. The side of the connecting part is provided with a radial hole, the diameter of the outer end of the radial hole is larger than the diameter of the inner part, and the outer end of the radial hole is provided with an internal thread for connecting a pneumatic control pipeline. The sealing part is conical, an axial hole is formed in the end face of the sealing part, and the axial hole is communicated with the radial hole to form an air inlet hole. Two annular grooves are formed in the side face of the sealing part, an O-shaped sealing ring 10 is arranged in the annular groove at the lower part, a buffer cushion 11 is arranged in the annular groove at the upper part, and the buffer cushion 11 is fixed on the lower end face of the connecting part through 4 screws 14. The cushion 11 serves to cushion and protect the product when the axial compression is excessive. The O-ring 10 becomes oval when pressed into the bottle mouth to perform a sealing function.

As shown in fig. 14, the pneumatic control pipeline includes a main pipe, and a high-pressure gas path H and a low-pressure gas path L corresponding to each gland, wherein the high-pressure gas path H and the low-pressure gas path L are respectively connected with an air outlet of the tee 35, and the air inlet is connected with the main pipe. The high-pressure gas path H includes a manual valve I37, a high-precision pressure regulating valve 32, a gas tank I24, six manual valves I41, and six speed regulating valves 46 (the number of the manual valves I41 and the speed regulating valves 46 is identical to the number of the cylinders 17). The manual valve I37, the high-precision pressure regulating valve 32 and the air storage tank I24 are sequentially connected, an air inlet of the manual valve I37 is connected with a tee joint, the air storage tank I24 is provided with three air outlets, each air outlet is connected with air inlets of two hand rotating valves I41 through a Y-shaped tee joint I38, and connection between the air outlet of the air storage tank I24 and the air inlet of each hand rotating valve I41 is achieved. One air outlet hole of each hand-operated valve I is connected with the rodless cavity of the air cylinder after the speed regulating valve, the other air outlet hole is connected with the rod cavity of the air cylinder, and the two air outlet holes of each hand-operated valve I are respectively communicated with the rodless cavity and the rod cavity of the same air cylinder 17.

The low-pressure pipeline L comprises a manual valve II 371, a low-precision pressure regulating valve 30, a gas storage tank II 241, six hand-rotating valves II 411 and six pressure gauges 22 (the number of the hand-rotating valves II 411 and the pressure gauges 22 is the same as that of the cylinders 17). The manual valve II 371, the low-precision pressure regulating valve 30 and the air storage tank II 241 are sequentially connected, and an air inlet of the manual valve II 371 is connected with the tee joint 35. The gas storage tank II 241 is provided with three gas outlets, each gas outlet is connected with the gas inlet holes of the two hand-rotating valves II 411 through a Y-shaped tee joint II, and the connection between the gas outlet of the gas storage tank II 241 and the gas inlet holes of each hand-rotating valve II 411 is realized. An air outlet hole of each hand-operated valve II 411 is connected with a radial hole on the corresponding gland 12 through a pipeline, a pressure gauge 22 is arranged on the pipeline, and a tee joint pressure gauge joint and a sealing gasket 23 are arranged at the joint of the pressure gauge 22. The other air outlet of the hand-turning valve II 411 is normally closed.

The structure of the air tank I24 is the same as that of the air tank II 241. As shown in fig. 10 and 11, the air tanks I24 and ii 241 include an air tank and two U-shaped brackets welded to the outer side wall of the air tank, and the U-shaped brackets are formed by bending steel plates. The air storage tank is a stainless steel weldment, plays a role in air storage and buffering, is arranged in the rack 1, and is connected with the threaded straight-through joint 15 by horizontally outwards arranging an air inlet with the internal thread of the taper pipe. The bottom of the U-shaped bracket is provided with two mounting holes, and the U-shaped bracket is fixed on the middle two transverse pipes 104 through bolts 26 and nuts 27. The bottom of the middle part of the air storage tank is welded with an internal threaded joint, and is in a screwed connection with a hexagonal plug 25 for cleaning and removing stains of the tank, and is in a blocking state at ordinary times. And 3 connectors with taper pipe internal threads are uniformly distributed and welded on the right upper surface of the air storage tank and are used for connecting a Y-shaped tee I38 or a Y-shaped tee II.

When the utility model is used, the method comprises the following steps:

1) Before the test, each gas path is checked to ensure reliable connection, and a test piece is fixed in each positioning seat.

2) In the test, the high-pressure precise pressure regulating valve 32 and the low-pressure precise pressure regulating valve 30 are set to the pressures required for the test, and then the manual valve 37 is rotated to the open position. At this time, the external high-pressure air source P is depressurized by the high/low precision pressure regulating valve 32/30 and then inflated into the air tank 24. After the air storage tank 24 is full of air, the handle of the hand-turning valve 41 at the high-pressure air path H is turned to D _n At the position (i.e. a position in fig. 14), the gas in the high-pressure gas storage tank 24 is divided into 6 gas paths by 3Y-shaped tee joints I38 arranged on the tank body, and is conveyed to 6 corresponding hand-rotating valves I41, and the gas is conveyed to the corresponding hand-rotating valves I41 by P of the hand-rotating valves I41 _H Port (air inlet hole) →B _H The port (air outlet hole) → the speed regulating valve 46 regulates the pipeline→the K1 port (air inlet I of the air cylinder) to enter the rodless cavity of the air cylinder 17. Meanwhile, the cylinder 17 is provided with a rod cavity gas, and the gas is discharged through the muffler 20 from a K2 port (cylinder air inlet II), an AH port (air outlet hole), an RH port (air return hole), and the rodless cavity gas pushes the cylinder 17 to move downwards so that the gland 12 compresses the test piece.

Then, the handle of the hand-turning valve II 411 at the low-pressure air path L is turned to the In position (namely the position c In fig. 14), and air enters the gland 12 from the port PL to BL to the digital display pressure gauge 22 to the port P1 to inflate and pressurize the product. After the pressure maintaining is finished, the hand-rotating valve II 411 at the L position in the low-pressure gas path is rotated to the Out position (namely the d position in FIG. 14), and the hand-rotating valve II 411 is rotated to the B position _L Port (air outlet hole) →R _L The port (air return hole) is communicated, the test piece and the test pipe section gas are discharged through the muffler 20, and the product is depressurized. Meanwhile, P of hand-operated valve II 411 _L (air inlet holes) →A _L (air outlet hole) is conducted, due to A _L Is normally closed, thereby the air supply port P of the air storage tank _L And closing. Then, the handle of the hand-operated valve 41 at the high-pressure gas path H is turned to the position Up (i.e. position b in FIG. 14), and the gas is discharged from P _H port-AH port-K2 port into the cylinder 17 with rod cavity; at the same time, the upper cavity K1 of the air cylinder 17 is one-way, namely, the speed regulating valve 46 is one-wayThe valve pipeline, BH port and RH port are communicated, gas in the rodless cavity of the cylinder 17 is discharged through the muffler 20 to release pressure, a piston rod of the lower cavity gas cylinder 17 moves upwards, and the gland 12 loosens a test piece and removes the test piece along with the ascending. In order to prevent the gas in the gas storage tank 24 from leaking out and protect the piston of the cylinder in the non-working state, the handles of the hand-rotating valve I41 and the hand-rotating valve II 411 are rotated to the middle positions in the normal state, and all the gas ports are closed, so that the whole test operation process is completed.

Claims

1. An airtight detection device for an internal conical container at the mouth part comprises a bench, a plurality of cylinder brackets, a positioning seat, a gland and a pneumatic control pipeline; the method is characterized in that: the cylinder bracket comprises a flange, an upright post, a supporting plate and two square tube beams; the upright post and the flange are coaxially welded, the flange is fixedly arranged on the bench, the square tube beam is perpendicular to the upright post and is arranged at the top of the upright post, and the two square tubes Liang Tongzhou; a U-shaped cylinder seat is arranged at the cantilever end of the square pipe beam; a cylinder is fixedly arranged in the cylinder seat; the cylinders are vertically arranged, a gland is arranged at the end part of a piston rod of each cylinder, and a positioning seat is fixedly arranged right below each cylinder on the rack;

2. The air tightness detecting device for a container having an inner conical surface as defined in claim 1, wherein: the upright post is made of round steel pipes.

3. The air tightness detecting device for a container having an inner conical surface as defined in claim 1, wherein: the rack comprises a top plate, two side panels, two hand-operated valve mounting plates, four long longitudinal pipes and a pressure regulating valve mounting plate;

4. A mouth-inside conical container airtight detecting device according to claim 3, wherein: the front ends and the rear ends of the two side panels are respectively connected through two long longitudinal pipes, one top surface of each long longitudinal pipe is contacted with the bottom surface of the top plate and welded, and the other long longitudinal pipe is arranged close to the transverse pipe at the middle part of each side supporting leg; the middle parts of the two long longitudinal pipes are connected through a transverse pipe, the bottom surfaces of the middle parts of the two long longitudinal pipes are respectively welded with a middle supporting leg, and the middle supporting legs are parallel to the side supporting legs and perpendicular to the top plate; the middle support leg is connected with the bottoms of the adjacent side support legs through small longitudinal pipes, the small longitudinal pipes are parallel to the long longitudinal pipes, and the bottoms of the two small longitudinal pipes are connected through transverse pipes.

5. The airtight detection apparatus for a container having an inner conical surface at its mouth portion as claimed in claim 4, wherein: the side support legs and the middle support legs are of tubular structures, and foot supporting plates are arranged at the bottoms of the side support legs and the middle support legs; the center of the supporting leg plate is provided with a threaded hole which is in threaded connection with an adjustable supporting leg, and the adjustable supporting leg is provided with a locking nut.

6. The air tightness detecting device for a container having an inner conical surface as defined in claim 1, wherein: the upper end face of the connecting part is provided with a plurality of threaded holes I which are connected with the piston rod through a plurality of screws; the lower end face of the connecting part is provided with a plurality of threaded holes II, and a buffer cushion is arranged through screws; the diameter of the outer end of the radial hole is larger than the diameter of the inner end of the radial hole, and the outer end of the radial hole is provided with internal threads.

7. The air tightness detecting device for a container having an inner conical surface as defined in claim 1, wherein: the positioning seat is disc-shaped, a counter bore is machined in the upper end face of the positioning seat, two grooves are formed in the inner side wall of the counter bore, a guide ring is arranged in each groove in the upper part of the counter bore, the lower side face of each groove in the bottom of the counter bore is level with the bottom face of the counter bore, and a buffer pad is arranged in each groove in the bottom of the counter bore; the center of the bottom surface of the positioning seat is provided with a small through hole.

8. The air tightness detecting device for a container having an inner conical surface as defined in claim 1, wherein: the pneumatic control pipeline comprises a main pipe, a high-pressure gas path and a low-pressure gas path corresponding to each gland, the high-pressure pipeline and the low-pressure pipeline are respectively connected with an air outlet of the tee joint, and the air inlet is connected to the main pipe; the high-pressure gas path comprises a manual valve I, a high-precision pressure regulating valve, a gas storage tank I, a plurality of hand-rotating valves I and a plurality of speed regulating valves; the number of the hand-rotating valves I and the speed regulating valves is the same as that of the air cylinders; the manual valve I, the high-precision pressure regulating valve and the air storage tank I are sequentially connected, an air inlet of the manual valve I is connected with a tee joint, and an air outlet of the air storage tank I is connected with an air inlet of each manual rotary valve I; one air outlet hole of the hand-rotating valve I is connected with the speed regulating valve and then is connected with the rodless cavity of the corresponding air cylinder, and the other air outlet hole of the hand-rotating valve I is connected with the rod cavity of the corresponding air cylinder, so that the two air outlet holes of the hand-rotating valve I are respectively connected with the rod cavity and the rodless cavity of the same air cylinder;

9. The air tightness detecting device for a container having an inner conical surface as defined in claim 8, wherein: and a muffler is arranged on the return air hole of the hand-operated valve I.