CN214502800U

CN214502800U - Airtightness testing device for corrugated pipe

Info

Publication number: CN214502800U
Application number: CN202120921671.7U
Authority: CN
Inventors: 林阿满; 何庆; 章阿海; 杨张吉
Original assignee: Zhejiang Yueding Corrugated Tube Co ltd
Current assignee: Zhejiang Yueding Corrugated Tube Co ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-10-26
Anticipated expiration: 2031-04-29

Abstract

The utility model discloses a bellows airtightness testing device, which comprises a water tank, a mounting rod component, a positioning frame structure and a clamping mechanism, wherein the positioning frame structure is arranged on the mounting rod component and is provided with a positioning groove for positioning a bellows, a lifting mechanism drives the mounting rod component to extend into the water tank, the clamping mechanism comprises two driving structures arranged on the mounting rod component, two pushing rods and two sealing stoppers arranged at the end parts of the two pushing rods, a vent pipeline structure for conveying gas to the bellows is arranged between the pushing rod and the sealing stoppers which are connected with any group, the two pushing rods drive the two sealing stoppers to be sealed and pressed at the two ends of the bellows under the driving of the driving structure, so as to achieve the automatic sealing effect, the bellows airtightness testing device has high automation degree, simple and convenient operation, greatly reduces the labor intensity, and has good testing stability, the detection efficiency is improved, and the reliability and accuracy of the test result are ensured.

Description

Airtightness testing device for corrugated pipe

Technical Field

The utility model relates to an airtight test technical field of bellows, concretely relates to airtight testing arrangement of bellows.

Background

The corrugated pipe is a tubular elastic sensitive element formed by connecting foldable corrugated sheets along the folding and stretching direction, mainly comprises a corrugated pipe main body processed by a metal pipe blank and two flanges welded at two ends of the corrugated pipe main body, the air tightness of the corrugated pipe which is just manufactured needs to be detected, the leakage-free condition of the corrugated pipe is ensured, and meanwhile, the welding quality between the corrugated pipe main body and the flanges is also detected through an air tightness test. The existing corrugated pipe air tightness test method generally adopts water pressure detection, the detection means is to seal two ends of a corrugated pipe to be detected, two plugging covers are usually required to be manually locked and sealed at the two ends of the corrugated pipe through fasteners, the corrugated pipe is placed in water after being pressurized, and whether the corrugated pipe leaks or not is judged according to the existence of bubbles, so that the air tightness of the corrugated pipe is detected.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming needs two blanking caps of manual work to pass through fastener locking seal at the bellows both ends among the prior art, places in the aquatic after pressurizing the bellows again and carries out the gas tightness and detect, and the locking of fastener is more time-consuming and energy-consuming, uses for a long time to get off can increase intensity of labour, and the testing process is comparatively loaded down with trivial details, reduces detection efficiency.

In order to solve the technical problem, the utility model provides an airtight testing arrangement of bellows, include:

the water tank is filled with liquid, and a lifting mechanism is arranged above the water tank;

the mounting rod assembly is connected with the lifting mechanism relative to the water tank, and the lifting mechanism drives the mounting rod assembly to extend into the water tank;

at least one group of positioning frame structures, which are arranged on the mounting rod assembly and are provided with positioning grooves for positioning corrugated pipes;

the clamping mechanism comprises two driving structures which are arranged on the mounting rod assembly and are respectively arranged at two ends of the positioning frame structure, two pushing rods which are respectively connected with the two driving structures and do telescopic motion between the driving structures and the positioning frame structure, and two sealing stoppers which are arranged at the end parts of the two pushing rods, wherein the two pushing rods drive the two sealing stoppers to be sealed and abutted against two ends of the corrugated pipe under the driving of the two driving structures; and a ventilation pipeline structure for conveying gas to the corrugated pipe is arranged between the push rod and the sealing stopper which are connected in any group.

Preferably, the ventilation pipeline structure comprises an inner channel which penetrates between the pushing rod and the sealing stopper, and an air inlet pipeline which penetrates through one of the driving structures to communicate with the inner channel, and the air inlet pipeline is connected with an air supply device through an air pipe.

Preferably, the sealing stopper includes a disk-shaped cap fixed to the pushing rod, an O-shaped groove formed in an end surface of the cap, and a rubber ring embedded in the O-shaped groove, and one end of the inner channel extends to a central position of the cap.

Preferably, the plug cover is made of carbon steel and is of an integral structure, and the plug cover comprises a threaded joint which is in threaded connection with the end of the pushing rod.

Preferably, the driving structure is a motor transmission device, a cylinder device or an electromagnet device, and the pushing rod is driven by the motor transmission device, the cylinder device or the electromagnet device to move towards or away from one end of the positioning frame structure.

As a preferable scheme, the mounting rod assembly comprises two opposite mounting plates and two groups of fixing rods connected in parallel between the two mounting plates, and the positioning frame structure and the driving structure can adjust the moving positions on the two groups of fixing rods through adjusting structures respectively.

As a preferred scheme, the locating rack structure includes two backup pads that wear to establish on two sets of dead levers to and fixed connection in backup pad one side and with the locating plate that drive structure is relative, the constant head tank is including setting up first U-shaped groove in the backup pad, and set up on the locating plate and with the second U-shaped groove that first U-shaped groove is relative, the opening bore in second U-shaped groove is less than the opening bore in first U-shaped groove, the location of the both ends of bellows is placed in the second U-shaped groove.

As a preferred scheme, the adjusting structure comprises a plurality of first adjusting holes which are formed in the two supporting plates and are suitable for the two groups of fixing rods to penetrate through, and a plurality of first adjusting nuts which are in threaded connection with the two groups of fixing rods and are respectively located on two sides of the two supporting plates, and the supporting plates can keep the installation positions fixed when moving and locking in opposite directions through the two first adjusting nuts on the two sides of the supporting plates.

As an optimal scheme, adjust the structure including respectively with two fixed regulating plates that link to each other of two drive structure, with set up the regulating plate just is fit for two sets of a plurality of second regulation holes that the dead lever passed to and threaded connection just is located a plurality of second adjusting nut of two regulating plate both sides respectively at two sets of installation poles, the regulating plate keeps the mounted position fixed when moving locking in opposite directions through two second adjusting nut of its both sides.

As a preferable scheme, two trapezoidal mounting brackets are arranged on the water tank, the lifting mechanism is respectively arranged on the two mounting brackets and is provided with a moving rod which vertically penetrates through the mounting brackets and is connected with the mounting plates; the lifting mechanism is an air cylinder mechanism or a hydraulic cylinder mechanism.

Compared with the prior art, the technical scheme of the utility model have following advantage:

1. in the airtight testing device provided by the utility model, when the airtight test is carried out on the corrugated pipe, the corrugated pipe is firstly placed in the positioning groove of the positioning frame structure, then the two driving structures drive the two pushing rods to move close to the two ends of the corrugated pipe and drive the two sealing stoppers to be sealed and pressed on the two ends of the corrugated pipe, thereby automatically clamping the corrugated pipe and achieving the sealing effect, then the lifting mechanism drives the installation rod assembly to sink the corrugated pipe into the liquid of the water tank, finally the ventilation pipeline structure pressurizes and transmits gas to the corrugated pipe through the pushing rods and the sealing stoppers, a worker detects the air tightness of the corrugated pipe according to the bubbling, the positioning frame structure can be provided with a plurality of groups on the installation rod assembly according to the design requirements, thus a plurality of corrugated pipes can be detected at one time, the automatic degree of the airtight testing device of the corrugated pipe adopting the technical scheme is high, and the airtight testing operation of the corrugated pipe is simple and convenient, greatly reduced artifical intensity of labour, test stability is good, improves detection efficiency, guarantees the reliability and the accuracy of test result, promotes the bellows quality inspection qualification rate.

2. The utility model provides an among the airtight testing arrangement, establish a rubber circle through inlaying in the O shape recess at the blanking cover terminal surface, when the blanking cover contacted the bellows, just in time made rubber circle and bellows port in close contact with, both played the sealing connection effect, avoided the direct hard extrusion bellows of blanking cover again, played the guard action to the bellows.

3. In the air tightness testing device provided by the utility model, the positioning frame structure is composed of two supporting plates and two positioning plates, the positioning grooves are erected between the two supporting plates and the two positioning plates according to the corrugated pipes, in order to meet the detection requirements of the corrugated pipes with different lengths, the relative length distance of the positioning grooves needs to be adjusted, when in adjustment, only two or one of the first adjusting nuts on the two sides of the supporting plates need to be adjusted to unlock the installation positions of the supporting plates on the fixing rods, then the moving positions of the supporting plates on the two groups of fixing rods are adjusted to realize the distance adjustment between the two supporting plates, the relative length distance adjustment of the positioning grooves is also achieved, after the adjustment is completed, the supporting plates are locked by the first adjusting nuts, thereby the detection requirements of the corrugated pipes with different lengths can be met, the adjustment is simple and convenient, the practicability is good, the application range is wide.

4. In the airtight testing device provided by the utility model, two driving structures are movably connected on two groups of fixed rods through two adjusting plates, when the relative distance between the driving structure and the positioning frame structure is changed, the installation position of the driving structure is correspondingly calibrated, only the second adjusting nuts on two sides of the adjusting plate need to be adjusted loosely, thus the locking of the installation position of the adjusting plate is removed, then the installation position of the driving structure on the two groups of fixed rods is changed by moving the adjusting plate, thereby the distance between the driving structure and the positioning frame structure is adjusted, after the adjustment is completed, the adjusting plate is locked by the second adjusting nuts, the adjustment operation is convenient, the two groups of fixed rods play a positioning and guiding role in the displacement adjustment of the driving structure and the positioning frame structure, and the driving structure and the positioning frame structure are ensured to be on the same straight line, thereby guarantee that two bulldoze the pole and can reliable and stable clamp bellows, the cooperation is reliable and stable to reach the self-sealing effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below.

Fig. 1 is a top view of the bellows airtightness testing apparatus provided by the present invention;

fig. 2 is a front view of the bellows airtightness testing apparatus according to the present invention;

fig. 3 is a left side view of the bellows airtightness testing apparatus according to the present invention;

fig. 4 is a schematic structural view of the mounting rod assembly of the present invention;

fig. 5 is a schematic plan view of the sealing stopper of the present invention;

description of reference numerals: 1. a water tank; 11. mounting a bracket; 2. a mounting bar assembly; 21. mounting a plate; 22. fixing the rod; 23. a first adjusting nut; 24. a second adjusting nut; 25. an adjusting plate; 3. a positioning frame structure; 31. a support plate; 32. positioning a plate; 33. a first U-shaped slot; 34. a second U-shaped slot; 4. a drive structure; 5. a push rod; 6. a seal stop; 61. blocking the cover; 62. a rubber ring; 63. a threaded joint; 7. a lifting mechanism; 71. a motion bar; 81. an air intake line; 82. an inner channel; 9. a bellows.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

The utility model provides a bellows airtight testing arrangement as shown in fig. 1-5, include:

the water tank 1 is filled with liquid, and a lifting mechanism 7 is arranged above the water tank 1;

the mounting rod assembly 2 is connected with the lifting mechanism 7 relative to the water tank 1, and the lifting mechanism 7 drives the mounting rod assembly 2 to extend into the water tank 1;

at least one set of spacer structures 3, arranged on the mounting bar assembly 2, having positioning slots for positioning the bellows 9;

the clamping mechanism comprises two driving structures 4 which are arranged on the mounting rod assembly 2 and are respectively arranged at two ends of the positioning frame structure 3, two pushing rods 5 which are respectively connected with the two driving structures 4 and do telescopic motion between the driving structures 4 and the positioning frame structure 3, and two sealing stoppers 6 arranged at the end parts of the two pushing rods 5, wherein the two pushing rods 5 drive the two sealing stoppers 6 to be sealed and abutted against two ends of the corrugated pipe 9 under the driving of the two driving structures 4; a ventilation pipeline structure for conveying air to the corrugated pipe 9 is arranged between the pushing rod 5 and the sealing stopper 6 which are connected with each other.

The above embodiment is the core technical solution of this embodiment, when performing an airtight test on the corrugated pipe 9, firstly, the corrugated pipe 9 is placed in a positioning groove of a positioning frame structure 3, then two driving structures 4 drive two pushing rods 5 to move close to two ends of the corrugated pipe 9, and drive two sealing stoppers 6 to seal and press against two ends of the corrugated pipe 9, so as to automatically clamp the corrugated pipe and achieve a sealing effect, then a lifting mechanism 7 drives a mounting rod assembly 2 to sink the corrugated pipe into liquid in a water tank, and finally, the ventilation pipeline structure pressurizes and conveys gas to the corrugated pipe through the pushing rods 5 and the sealing stoppers 6, a worker detects the airtightness of the corrugated pipe 9 according to the existence of bubbling, the positioning frame structure 3 can set multiple groups on the mounting rod assembly 2 according to design requirements, so as to detect multiple corrugated pipes at one time, and the degree of automation of the airtight test device for corrugated pipe adopting the technical solution is high, the air tightness test operation of the corrugated pipe is simple and convenient, the labor intensity of workers is greatly reduced, the test stability is good, the detection efficiency is improved, the reliability and the accuracy of a test result are ensured, and the quality inspection qualified rate of the corrugated pipe is improved.

As a preferred embodiment, the ventilation pipeline structure comprises an inner channel 82 penetrating between the pushing rod 5 and the sealing stopper 6, and an air inlet pipeline 81 penetrating through one of the driving structures 4 to communicate with the inner channel 82, the air inlet pipeline 81 is connected with an air supply device through an air pipe, the air supply device can select an air pump, and starts to inject air after the corrugated pipe 9 extends into the water tank 1 along with the mounting rod assembly 2, and the structure is arranged that a pipeline capable of communicating with the port of the corrugated pipe is formed among the air supply device, the air inlet pipeline, the pushing rod and the sealing stopper, and the air supply device injects air into the inner channel 82 through the air inlet pipeline 81 and then injects air into the corrugated pipe through the inner channel 82, so as to achieve the purpose of detecting the air tightness of the corrugated pipe.

The particular arrangement of the seal stop 6 is described in detail below with reference to fig. 1-2 and 5:

the sealing stopper 6 comprises a disk-shaped plug cover 61 fixed on the pushing rod 5, an O-shaped groove formed on the end surface of the plug cover 61, and a rubber ring 62 embedded in the O-shaped groove, one end of the inner channel 82 extends to the central position of the plug cover 61, the plug cover 61 is tightly attached to the port of the corrugated pipe under the driving of the pushing rod 5, when the plug cover 61 contacts the corrugated pipe 9, the rubber ring 62 is just kept in tight contact with the port of the corrugated pipe, the sealing connection effect is achieved, the situation that the plug cover 61 directly and hard extrudes the corrugated pipe 9 is avoided, and the protection effect on the corrugated pipe 9 is achieved.

Further preferred setting, blanking cover 61 is made for carbon steel material body structure, blanking cover 61 includes threaded connection and is in bulldoze the screwed joint 63 of 5 tip of pole, it is equipped with the helicitic texture to bulldoze 5 tip correspondence, and blanking cover 61 that this kind of carbon steel was made has better hardness and wearability, interior passageway 82 run through in screwed joint 63 and blanking cover 61 are last, set up easy to assemble like this and dismantle blanking cover 61, the maintenance of being convenient for.

As shown in fig. 2-4, the positioning frame structure 3 includes two supporting plates 31 penetrating through two groups of fixing rods 22, and positioning plates 32 fixedly connected to one side surfaces of the supporting plates 31 and opposite to the driving structure 4, the positioning groove is disposed between the two supporting plates 31 and the two positioning plates 32, the positioning groove includes a first U-shaped groove 33 disposed on the supporting plate 31, and a second U-shaped groove 34 disposed on the positioning plates 32 and opposite to the first U-shaped groove 33, an opening diameter of the second U-shaped groove 34 is smaller than an opening diameter of the first U-shaped groove 33, referring to fig. 1, two ends of the corrugated tube 9 are positioned and placed in the second U-shaped groove 34, a corrugated main body portion of the corrugated tube 9 is located between the first U-shaped grooves of the two supporting plates 31, and flanges at two ends of the corrugated tube are abutted against end faces of the second U-shaped groove, the corrugated pipe positioning device has the advantages that the corrugated pipe is positioned in the positioning groove to limit the corrugated pipe to slide or roll out of the positioning groove, so that the two push plates can be accurately and reliably clamped and pressed at two ends of the corrugated pipe during telescopic motion.

In this embodiment, as shown in fig. 3, the mounting rod assembly 2 includes two opposite mounting plates 21 and two sets of fixing rods 22 connected in parallel between the two mounting plates 21, each set of fixing rods 22 is composed of two circular rods, and the positioning frame structure 3 and the driving structure 4 can be adjusted in moving positions on the two sets of fixing rods 22 by adjusting structures, so that the specific mounting positions of the positioning frame structure 3 and the driving structure 4 can be adjusted according to actual operation requirements.

The following detailed description will be made with reference to fig. 2 and 4 for a specific arrangement of the adjusting structure:

the adjusting structure comprises two first adjusting holes formed in the supporting plate 31 and suitable for two groups of fixing rods 22 to penetrate through, and a plurality of first adjusting nuts 23 which are connected to the two groups of fixing rods 22 in a threaded mode and located on two sides of the supporting plate 31 respectively, and the supporting plate 31 is fixed in installation position when being locked through the two first adjusting nuts 23 on two sides of the supporting plate 31 in a moving mode in the opposite direction. This kind of structure setting, erect in the constant head tank between two backup pads 31 and two locating plates 32 according to bellows 9, in order to satisfy the detection requirement of different length bellows 9, just need adjust the relative length distance of constant head tank, during the regulation, only need transfer two or one of them the first adjusting nut 23 of backup pad 31 both sides is in order to relieve the mounted position locking at dead lever 22 to backup pad 31, then go to adjust the shift position of backup pad 31 on two sets of dead levers 22 again, in order to realize the distance adjustment between two backup pads 31, just also reached the relative length distance adjustment of constant head tank, adjust after the completion reuse first adjusting nut 23 with backup pad 31 locking can, thereby can satisfy the bellows 9 detection requirement of different length, adjust simple and convenient, the practicality is good, application range is wide.

As a preferred embodiment, the adjusting structure comprises two adjusting plates 25 fixedly connected with the two driving structures 4, respectively, and a plurality of second adjusting holes arranged on the adjusting plates 25 and suitable for two sets of the fixing rods 22 to pass through, and a plurality of second adjusting nuts 24 screwed on two sets of mounting rods and respectively located on two sides of the two adjusting plates 25, wherein the adjusting plates 25 are fixed in mounting position when being locked by moving the two second adjusting nuts 24 on two sides of the adjusting plates in opposite directions. According to the structure, the two driving structures 4 are movably connected to the two groups of fixing rods 22 through the two adjusting plates 25 respectively, the adjusting plates 25 are provided with through holes through which the pushing rods can pass, when the relative distance between the driving structures 4 and the positioning frame structure 3 changes, in order to ensure that the two pushing rods can stably and reliably clamp the corrugated pipe 9, the mounting positions of the driving structures 4 need to be correspondingly calibrated, only two or one of the second adjusting nuts 24 on the two sides of the adjusting plate 25 need to be adjusted, so that the mounting positions of the adjusting plates 25 are unlocked, then the mounting positions of the driving structures 4 on the two groups of fixing rods 22 are changed by moving the adjusting plates, so that the distance between the driving structures 4 and the positioning frame structure 3 is adjusted, and the adjusting plates 25 are locked by the second adjusting nuts 24 after the adjustment is completed, the adjusting operation is convenient, the two groups of fixing rods play a positioning and guiding role in the displacement adjustment of the driving structure 4 and the positioning frame structure 3, and the driving structure 4 and the positioning frame structure 3 are ensured to be in the same straight line, so that the two pushing rods 5 drive the sealing stoppers to be tightly attached to the two ends of the corrugated pipe under the driving of the two driving structures 4, and the matching is stable and reliable, so that the automatic sealing effect is achieved.

In this embodiment, the arrangement manner of the driving structure 4 is not unique, the driving structure 4 may be selected from a motor transmission device, an air cylinder device, or an electromagnet device, the pushing rod 5 moves towards a direction close to or away from one end of the positioning frame structure 3 under the driving of the motor transmission device, the air cylinder device, or the electromagnet device, and finally the power and the motion output by the motor transmission device, the air cylinder device, or the electromagnet device are converted into the linear telescopic motion of the pushing rod 5.

As shown in fig. 3, two trapezoidal mounting brackets 11 are arranged on the water tank 1, the lifting mechanism 7 is respectively arranged on the two mounting brackets 11 and has a moving rod 71 vertically passing through the mounting brackets 11 and connected with the mounting plate 21, the lifting mechanism 7 is an air cylinder mechanism or a hydraulic cylinder mechanism, the moving rod 71 is driven by the lifting mechanism 7 to reciprocate in the vertical direction, so that the mounting rod assembly 2 and the corrugated pipe are driven by the mounting plate 21 to extend into the water tank 1, and after the airtightness detection is completed, the mounting rod assembly 2 and the corrugated pipe are driven to extend out of the water tank 1 to prepare for the next detection work. The airtight testing device of this embodiment still is equipped with a control operation panel, sets up the central controller who has data information processing function in the control operation panel to it passes through agreement or circuit centralized control as the core airtight testing device's each mechanism cooperation coordination work, the simple operation, degree of automation is high.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A bellows airtightness test apparatus, comprising:

the water tank (1) is filled with liquid, and a lifting mechanism (7) is arranged above the water tank (1);

the mounting rod assembly (2) is connected with the lifting mechanism (7) relative to the water tank (1), and the lifting mechanism (7) drives the mounting rod assembly (2) to extend into the water tank (1);

at least one set of positioning frame structures (3) arranged on the mounting rod assembly (2) and provided with positioning grooves for positioning corrugated pipes (9);

the clamping mechanism comprises two driving structures (4) which are arranged on the mounting rod assembly (2) and are respectively arranged at two ends of the positioning frame structure (3), two pushing rods (5) which are respectively connected with the two driving structures (4) and do telescopic motion between the driving structures (4) and the positioning frame structure (3), and two sealing blocking pieces (6) which are arranged at the end parts of the two pushing rods (5), wherein the two pushing rods (5) drive the two sealing blocking pieces (6) to be in sealing and blocking at two ends of the corrugated pipe under the driving of the two driving structures (4); a ventilation pipeline structure used for conveying gas to the corrugated pipe is arranged between any group of connected pushing rods (5) and the sealing stoppers (6).

2. A bellows airtightness testing apparatus according to claim 1, wherein: the ventilation pipeline structure comprises an inner channel (82) which penetrates through the pushing rod (5) and the sealing stopper (6), and an air inlet pipeline (81) which penetrates through one of the driving structures (4) to be communicated with the inner channel (82), wherein the air inlet pipeline (81) is connected with an air supply device through an air pipe.

3. A bellows airtightness testing apparatus according to claim 2, wherein: the sealing stopper (6) comprises a disc-shaped plug cover (61) fixed on the pushing rod (5), an O-shaped groove formed on the end face of the plug cover (61), and a rubber ring (62) embedded in the O-shaped groove, and one end of the inner channel (82) extends to the central position of the plug cover (61).

4. A bellows airtightness testing apparatus according to claim 3, wherein: the blanking cover (61) is made of a carbon steel integrated structure, and the blanking cover (61) comprises a threaded joint (63) which is in threaded connection with the end part of the pushing rod (5).

5. A bellows airtightness testing apparatus according to claim 4, wherein: the driving structure (4) is a motor gearbox device or an air cylinder device or an electromagnet device, and the pushing and pressing rod (5) moves towards the direction close to or far away from one end of the positioning frame structure (3) under the driving of the motor gearbox device or the air cylinder device or the electromagnet device.

6. A bellows airtightness testing apparatus according to any one of claims 1 to 5, wherein: the mounting rod assembly (2) comprises two mounting plates (21) which are oppositely arranged and two groups of fixing rods (22) which are parallelly connected between the mounting plates (21), and the positioning frame structure (3) and the driving structure (4) are respectively two groups of adjustable moving positions on the fixing rods (22) through adjusting structures.

7. A bellows airtightness testing apparatus according to claim 6, wherein: the utility model discloses a drive structure, including two fixed rods (22), locating rack structure (3) including wear to establish two backup pads (31) on two sets of dead levers (22) to and fixed connection in backup pad (31) one side and with locating plate (32) that drive structure (4) are relative, the constant head tank is including setting up first U-shaped groove (33) on backup pad (31) and setting are in on locating plate (32) and with second U-shaped groove (34) that first U-shaped groove (33) is relative, the opening bore of second U-shaped groove (34) is less than the opening bore of first U-shaped groove (33), the both ends location of bellows is placed in second U-shaped groove (34).

8. A bellows airtightness testing apparatus according to claim 7, wherein: adjust the structure including setting up two a plurality of first regulation holes that backup pad (31) and suitable two sets of dead lever (22) passed to and threaded connection just is located two respectively on two sets of dead lever (22 a plurality of first adjusting nut (23) of backup pad (31) both sides, backup pad (31) keep the mounted position fixed when moving locking in opposite directions through two first adjusting nut (23) of its both sides.

9. A bellows airtightness testing apparatus according to claim 7, wherein: the adjusting structure comprises two adjusting plates (25) fixedly connected with the two driving structures (4) respectively and is arranged on the adjusting plates (25) and suitable for being two sets of a plurality of second adjusting holes through which the fixing rods (22) penetrate and a plurality of second adjusting nuts (24) which are in threaded connection with two sets of mounting rods and located on two sides of the adjusting plates (25) respectively, wherein the adjusting plates (25) are fixed in mounting positions when the two second adjusting nuts (24) on two sides of the adjusting plates move and are locked in opposite directions.

10. A bellows airtightness testing apparatus according to any one of claims 7 to 9, wherein: the water tank (1) is provided with two trapezoidal mounting brackets (11), the lifting mechanism (7) is respectively arranged on the two mounting brackets (11) and is provided with a moving rod (71) which vertically penetrates through the mounting brackets (11) and is connected with the mounting plates (21); the lifting mechanism (7) is an air cylinder mechanism or a hydraulic cylinder mechanism.