CN217403775U - Expansion joint performance detection device - Google Patents

Abstract

The application provides an expansion joint performance detection device relates to pipeline expansion joint technical field. Wherein, this frock includes: a lower tooling assembly, comprising: the first pressure bearing plate and the first fixing plate are mounted on the top side of the first pressure bearing plate and pressed on the upper end face of the lower end pipe, and a first sealing gasket corresponding to the lower end pipe is arranged on the surface, facing the first fixing plate, of the first pressure bearing plate; go up the frock subassembly, be located the top side of frock subassembly down, it includes: second bearing plate, a plurality of interval distribution's second fixed plate, the inspection hole has been seted up at the middle part of second bearing plate, the second fixed plate install in the second bearing plate, just the one end of second fixed plate extends to in a trough in the bellows outside, the other end of second fixed plate with demountable installation has the stopper between the second bearing plate.

Description

Expansion joint performance detection device

Technical Field

The application relates to the technical field of pipeline expansion joints, in particular to an expansion joint performance detection device.

Background

For the straight pipeline through which the low-temperature medium flows, the temperature changes, and the expansion joint is needed to compensate the cold shrinkage of the pipeline, so that the stress of the pipeline is reduced, and the safe operation of a low-temperature pipeline system is ensured. Different from a high-temperature pipeline, the low-temperature pipeline is used for conveying cold energy, the low-temperature straight pipeline needs to compensate displacement generated by cold contraction of the pipeline, the cold insulation effect requirement of the pipeline is high, and the low-temperature pipeline for conveying low-temperature media generally needs a plurality of process pipelines to be arranged side by side according to the process characteristics of the low-temperature pipeline, so that the performance requirement on the expansion joint is higher.

The expansion joint performance test mainly comprises a pressure test, a stability test, a rigidity test and a fatigue test. All standard specified pressure tests are product delivery test items, and the delivery pressure tests are used for testing the sealing property of expansion joint welding seams, the pressure bearing capacity of corrugated pipes and the strength and rigidity of stressed members.

In the prior art, the expansion joint is directly compressed and sealed through the upper bearing plate and the lower bearing plate so as to perform a pressure test, but for the expansion joint with lower rigidity, the mode cannot realize reliable sealing of the expansion joint, and the compression damage of the expansion joint is easily caused.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims to provide an expansion joint performance detection device to realize performance detection of an expansion joint with lower rigidity in an end pipe connection mode.

In order to solve the above technical problem, the embodiments of the present application provide the following technical solutions:

this application first aspect provides an expansion joint performance detection device, and this expansion joint performance detection device includes: a lower tooling assembly, comprising: the first bearing plate and the first fixing plate are mounted on the top side of the first bearing plate and pressed on the upper end face of the lower end pipe, and a first sealing gasket corresponding to the lower end pipe is arranged on the surface, facing the first fixing plate, of the first bearing plate;

go up the frock subassembly, be located the top side of frock subassembly down, it includes: the corrugated pipe comprises a second bearing plate and a plurality of second fixing plates distributed at intervals, wherein a detection hole is formed in the middle of the second bearing plate, the second fixing plate is installed on the second bearing plate, one end of the second fixing plate extends into one trough on the outer side of the corrugated pipe, a limiting block is detachably installed between the other end of the second fixing plate and the second bearing plate, and a second sealing gasket corresponding to the upper end pipe is arranged on the surface, facing the second fixing plate, of the second bearing plate;

and the locking assemblies are connected to the peripheries of the first bearing plate and the second bearing plate at intervals and used for connecting and fixing the upper tool assembly and the lower tool assembly after being installed.

In some modified embodiments of the present application, a first through hole is formed in a middle portion of the first bearing plate and the first fixing plate, and is used for passing a first bolt;

the lower tool assembly further comprises: the base is arranged on the bottom side of the first bearing plate, a threaded hole is formed in one side, facing the first bearing plate, of the base, and the first bolt is in threaded connection with the threaded hole of the base.

In some modified embodiments of the present application, the second pressure bearing plate and the plurality of second fixing plates are correspondingly provided with second through holes for connecting second bolts, and screws of the second bolts penetrate through the second through holes of the second pressure bearing plate and are connected with locking nuts through threads.

In some variations of the present application, the second fixing plate includes opposite support ends extending to the outside of the corrugated tube and located in the valleys of the top, and limit ends having shapes and sizes matched with those of the valleys of the corrugated tube.

In some variation embodiments of this application, the second fixed plate the spacing end with the second bearing plate is relative be provided with respectively on the surface adaptation in the spacing groove of stopper, the stopper inlays respectively on vertical relative two tip and locates correspondingly the spacing inslot.

In some modified embodiments of the present application, a plurality of first ring grooves are formed on the surface of the first bearing plate facing the first fixing plate from the middle to the outer edge at intervals, the lower tooling assembly includes a plurality of first sealing gaskets respectively adapted to the plurality of first ring grooves to adapt to the lower end pipes with different sizes, and the first sealing gaskets are detachably mounted in the corresponding first ring grooves;

the second bearing plate orientation the second fixed plate is provided with multichannel second annular by middle part to outer edge interval on the surface, it includes a plurality of difference adaptations to go up the frock subassembly multichannel second annular the second is sealed to fill up to the not unidimensional of adaptation upper end pipe, the sealed demountable installation of pad in the second corresponds.

In some modified embodiments of the present application, the number of the first fixing plates is plural, and the diameters of the plural first fixing plates are different from each other to fit the lower tubes of different sizes.

In some variations of the present application, the stopper is a telescopic member, the distance between two longitudinally opposite ends of which is adjustable to fit the expansion joints of different sizes;

the second fixing plate is a telescopic piece, and the distance between the supporting end and the limiting end is adjustable so as to adapt to the expansion joints with different sizes.

In some modified embodiments of the present application, the number of the second fixing plate and the limiting block is plural, and the distance between the supporting end and the limiting end of the second fixing plate is different from each other, and the longitudinal dimension of the limiting block is different from each other, so as to adapt to the expansion joints with different dimensions.

In some modified embodiments of the present application, the number of the second fixing plate and the number of the limiting block are at least 6.

Compared with the prior art, the expansion joint performance detection device provided by the application can realize sealing of the lower end of the expansion joint and fixing of the lower end pipe through the lower tool assembly, can realize sealing of the upper end of the expansion joint and fixing of the upper end pipe through the upper tool assembly, and can realize integral fixing through the plurality of locking assemblies, so that excessive pressure is prevented from being applied to the expansion joint while the sealing reliability is ensured, the expansion joint performance detection device is suitable for performance tests of expansion joints with lower rigidity, and the use requirements of pressure tests and air tightness tests of the expansion joint can be met; and the expansion joints with different lengths and calibers can be sealed and fixed, the tool is high in practicability and wide in application range.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 schematically shows a schematic cross-sectional structure diagram of an expansion joint performance detection device provided by an embodiment of the present invention;

FIG. 2 is a partially enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of a portion B of FIG. 1;

fig. 4 schematically shows a schematic cross-sectional structural view of a second fixing plate of an expansion joint performance detection apparatus provided by an embodiment of the present invention;

the reference numbers indicate:

the first pressure bearing plate 11, the first fixing plate 12, the first sealing gasket 13, the first bolt 14, the base 15, the first through hole 101, the threaded hole 102, the first annular groove 103, the second pressure bearing plate 21, the second fixing plate 22, the supporting end 221, the limiting end 222, the limiting block 23, the protruding portion 231, the second sealing gasket 24, the second bolt 25, the lock nut 26, the detection hole 201, the second through hole 202, the limiting groove 203, the second annular groove 204, the locking assembly 3, the upper end pipe 41, the lower end pipe 42, and the corrugated pipe 43.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be noted that, unless otherwise specified, technical terms or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.

Example one

Referring to fig. 1 to 4, as shown in the drawings, an embodiment of the present invention provides an expansion joint performance detection apparatus, which includes: a lower tooling assembly, comprising: the first pressure bearing plate 11 and the first fixing plate 12, the first fixing plate 12 is mounted on the top side of the first pressure bearing plate 11 and is pressed against the upper end surface of the lower end pipe 42, and the surface of the first pressure bearing plate 11 facing the first fixing plate 12 is provided with a first sealing gasket 13 corresponding to the lower end pipe 42; go up the frock subassembly, be located the top side of frock subassembly down, it includes: the corrugated pipe 43 comprises a second pressure bearing plate 21 and a plurality of second fixing plates 22 distributed at intervals, wherein a detection hole 201 is formed in the middle of the second pressure bearing plate 21, the second fixing plate 22 is installed on the second pressure bearing plate 21, one end of the second fixing plate 22 extends into one trough on the outer side of the corrugated pipe 43, a limiting block 23 is detachably installed on the other end of the second fixing plate 22 and the second pressure bearing plate 21 in a supporting mode, and a second sealing gasket 24 corresponding to the upper end pipe 41 is arranged on the surface, facing the second fixing plate 22, of the second pressure bearing plate 21; and the locking assemblies 3 are connected with the periphery of the first bearing plate 11 and the second bearing plate 21 at intervals and used for connecting and fixing the upper tool assembly and the lower tool assembly after being installed.

Specifically, the expansion joint performance detection device that this embodiment provided is used for carrying out the performance detection to the expansion joint that rigidity is less, specifically can be for pressure detection, gas tightness detection etc. and the structure of expansion joint includes: upper end pipe 41, lower extreme pipe 42 to and connect bellows 43 between the two, for avoiding carrying out the sealed damage that exerts too big pressure and cause bellows 43 to the expansion joint, the frock that this scheme provided mainly includes the triplex, is respectively down the frock subassembly, goes up the frock subassembly and is used for connecting a plurality of locking Assembly 3 of fixed frock subassembly and lower frock subassembly, wherein, goes up the lower extreme pipe 42 that the frock subassembly is used for fixed expansion joint, and it mainly includes: the first bearing plate 11 is positioned at the bottom side of the tool, the upper surface of the first bearing plate 11 is provided with an annular first sealing gasket 13, the lower part of the lower end pipe 42 is pressed on the first sealing gasket 13, so that the sealing effect of the lower end of the expansion joint can be improved, and the first fixing plate 12 is fixed at the upper side of the first bearing plate 11 and pressed on the upper end surface of the lower end pipe 42, so that the lower end pipe 42 of the expansion joint can be fixed; go up the frock subassembly and set up in the top side of last frock subassembly for the upper end pipe 41 of fixed expansion joint, it mainly includes: a second bearing plate 21 and a plurality of second fixing plates 22 distributed at intervals, wherein the second bearing plate 21 is placed on the top side of the expansion joint, the lower surface of the second bearing plate 21 is provided with an annular second sealing gasket 24, the second sealing gasket 24 is pressed and held on the upper end pipe 41 of the expansion joint, the sealing effect of the upper end of the expansion joint can be improved, the middle part of the second bearing plate 21 is provided with a detection hole 201 which can be used for injecting liquid and the like into a closed space formed among the first bearing plate 11, the second bearing plate 21 and the expansion joint after the installation of the tool and the expansion joint is completed, so as to realize the performance detection of the expansion joint, the plurality of second fixing plates 22 can be uniformly distributed on the bottom side of the second bearing plate 21 and are fixed on the second bearing plate 21, meanwhile, one end of the second fixing plate 22 extends to the outer side of the corrugated pipe 43 and is closest to one wave trough of the second bearing plate 21, a limiting block 23 is arranged between the other end of the second fixing plate 22 and the second bearing plate 21, the height dimension adaptation of stopper 23 is in the perpendicular distance between this tip of second fixed plate 22 and the second bearing plate 21, thereby can adopt the bolt between the both ends of second fixed plate 22, when structures such as nut are fixed with second bearing plate 21, be convenient for control bolt, the locking of nut structure, and can avoid causing the damage to bellows 43 when fixed, through the setting of last frock subassembly, can realize with bellows 43 and upper end pipe 41 fixed the while, supplementary restriction expansion joint is in the radial movement who detects, can improve the reliability to expansion joint radial fixation. The plurality of locking assemblies 3 are used for locking and fixing the first bearing plate 11 and the second bearing plate 21 after the lower tool assembly and the upper tool assembly are respectively installed on the expansion joint, so that the whole tool is assembled with the expansion joint, and the expansion joint can be reliably sealed without applying overlarge pressing force on the expansion joint.

Specifically, compared with the arrangement of an integral annular mold, the use of the split second fixing plates 22 can effectively reduce the weight and avoid the occurrence of heavy pressure on the corrugated tube 43, and the number of the second fixing plates 22 can be, but is not limited to, 6; the first sealing gasket 13 and the second sealing gasket 24 may be vacuum rubber gaskets to achieve a good elastic sealing effect.

According to the above row, the embodiment of the utility model provides an expansion joint performance detection device, can realize the sealing of expansion joint lower extreme and with lower extreme pipe 42's fixed through lower frock subassembly, can realize the sealing of expansion joint upper end and with the fixed of upper end pipe 41 through last frock subassembly, the monolithic stationary is realized to a plurality of locking Assembly 3 of rethread, can be when guaranteeing sealed reliability, avoid applying too big pressure to the expansion joint, be applicable to the performance test of the expansion joint that rigidity is less, and can satisfy the pressure test and the air tightness test's of expansion joint user demand simultaneously.

Further, referring to fig. 1, in a specific implementation, a first through hole 101 is formed in the middle of the first bearing plate 11 and the first fixing plate 12, and is used for penetrating a first bolt 14; the lower tool assembly further comprises: the base 15 is disposed at a bottom side of the first bearing plate 11, a threaded hole 102 is formed in a side of the base 15 facing the first bearing plate 11, and the first bolt 14 is in threaded connection with the threaded hole 102 of the base 15.

Specifically, in order to realize the fixed mounting of first bearing plate 11 and first fixed plate 12, the utility model discloses in the technical scheme who takes, correspond at the middle part of first bearing plate 11 and first fixed plate 12 and set up first through-hole 101 to wear to establish the first bolt 14 with the diameter adaptation of first through-hole 101 in first through-hole 101, and the frock subassembly still includes base 15 down, base 15 sets up the bottom side at the first through-hole 101 of first bearing plate 11, base 15 is seted up the screw hole 102 that first through-hole 101 corresponds and communicate towards one side of first bearing plate 11, first bolt 14 can be connected with screw hole 102 of base 15, in order to realize the fixed to first bearing plate 11 and first fixed plate 12.

Further, referring to fig. 1, in a specific implementation, the second bearing plate 21 and the plurality of second fixing plates 22 are correspondingly provided with second through holes 202 for connecting second bolts 25, and screws of the second bolts 25 penetrate through the second through holes 202 of the second bearing plate 21 and are threadedly connected with locking nuts 26.

Specifically, in order to realize the fixed of second bearing plate 21 and second fixed plate 22, the utility model discloses in the technical scheme who takes, can set up second through-hole 202 on second bearing plate 21 and the middle part correspondence of second fixed plate 22, a second bolt 25 for wear to establish with the diameter adaptation of second through-hole 202, second bolt 25's screw rod is worn out and is locked fixedly through lock nut 26 from the top side of second bearing plate 21, limiting displacement through stopper 23 is favorable to controlling lock nut 26's locking force, can avoid causing the deformation of bellows 43 and damage even.

Further, referring to fig. 1 and 4, in an implementation, the second fixing plate 22 includes opposite support ends 221 and limit ends 222, the support ends 221 extend to the outside of the corrugated tube 43 and are located in the valleys of the top, and the support ends 221 have shapes and sizes matched with those of the valleys of the corrugated tube 43.

Specifically, the second fixing plate 22 includes the opposite supporting end 221 and the limiting end 222 in the horizontal direction, and the second through hole 202 is located between the supporting end 221 and the limiting end 222, in order to make the present invention adopt the technical solution that the supporting end 221 is set to extend to the wave trough of the corrugated tube 43 located at the outside and at the top, and the shape and the size are completely adapted to the wave trough, so as to avoid the local deformation of the corrugated tube 43, avoid the heavy pressure generated to the corrugated tube 43 in the assembling process, facilitate the protection of the corrugated tube 43, and effectively limit the radial displacement of the corrugated tube 43 in the test; polyurethane can be selected as the material of the second fixed block, so that the scratch, the deformation and the like of the corrugated pipe 43 can be avoided while the weight and the cost are reduced.

Further, referring to fig. 1 and fig. 3, in a specific implementation, the opposite surfaces of the limiting end 222 of the second fixing plate 22 and the second pressure-bearing plate 21 are respectively provided with a limiting groove 203 adapted to the limiting block 23, and two opposite ends of the limiting block 23 in the longitudinal direction are respectively embedded in the corresponding limiting grooves 203.

Specifically, in order to avoid the skew to appear in the position of stopper 23, the utility model discloses in the technical scheme who takes, set up spacing groove 203 on the relative surface of spacing end 222 and the second bearing plate 21 of second fixed plate 22, spacing groove 203 on the second bearing plate 21 and stopper 23's top shape, size adaptation, in order to reduce the size of second fixed plate 22, as shown in fig. 3, can set up convex bellying 231 to the bottom side in stopper 23 bottom and one side that is close to the expansion joint, and set up spacing groove 203 on the spacing end 222 of second fixed plate 22 into the top shape with bellying 231, size adaptation, thereby can enough realize the reliable installation to stopper 23, can reduce the size of second fixed plate 22 again, be favorable to the frock to subtract heavy.

Further, referring to fig. 1, in order to improve the practicability and the application range of the tool, in the specific implementation, in order to make the tool suitable for sealing expansion joints with different lengths and calibers, the technical solution adopted by the present invention is that, first, a plurality of first ring grooves 103 are provided on the surface of the first pressure-bearing plate 11 facing the first fixing plate 12 at intervals from the middle portion to the outer edge, and a plurality of first sealing gaskets 13 respectively adapted to the plurality of first ring grooves 103 are provided, a first sealing gasket 13 with a corresponding size is selected according to the size of the lower end pipe 42 of the expansion joint to be tested, and is installed in the corresponding first ring groove 103, and similarly, a plurality of second ring grooves 204 are provided on the surface of the second pressure-bearing plate 21 facing the second fixing plate 22 at intervals from the middle portion to the outer edge, and a plurality of second sealing gaskets 24 respectively adapted to the plurality of second ring grooves 204 are provided, a second sealing gasket 24 with a corresponding size is selected according to the size of the upper end pipe 41 of the expansion joint to be tested, the expansion joint is arranged in the corresponding second ring groove 204, so that the expansion joints with different calibers can be sealed; secondly, the first fixing plate 12 with various diameters can be provided, and firstly, the lower end pipes 42 with different sizes are cultivated to fix the expansion joints with different calibers; in addition, in order to realize the fixation of the expansion joints with different lengths, a second fixing plate 22 and a limiting block 23 with various height dimensions can be provided, or, in order to reduce the cost, the limiting block 23 and the second fixing plate 22 can be respectively set as telescopic pieces, and the distance between two opposite end parts of the limiting block 23 in the longitudinal direction can be adjusted, for example: the limiting block 23 may be an elastic member, but not limited to a spring, or the limiting member may be a split structure, and the longitudinal size of the limiting block is changed by adjusting the connection position of the two split parts, where the two parts are detachably connected; the distance between the supporting end 221 and the limiting end 222 of the second fixing plate 22 is adjustable, and a split structure may be specifically adopted, the supporting end 221 and the limiting end 222 are two separated parts, the limiting end 222 may be provided with the second through hole 202, and the position of the supporting end 221 relative to the fixed end is adjustable, which is not limited to a specific implementation manner here.

It should be noted that in the description of the present specification, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An expansion joint performance detection apparatus, the expansion joint comprising: upper end pipe, lower extreme pipe and connect the bellows between the two, its characterized in that includes:

a lower tooling assembly, comprising: the first bearing plate and the first fixing plate are mounted on the top side of the first bearing plate and pressed on the upper end face of the lower end pipe, and a first sealing gasket corresponding to the lower end pipe is arranged on the surface, facing the first fixing plate, of the first bearing plate;

go up the frock subassembly, be located the top side of frock subassembly down, it includes: the corrugated pipe comprises a first bearing plate and a plurality of first fixing plates distributed at intervals, wherein a detection hole is formed in the middle of the first bearing plate, the first fixing plates are installed on the first bearing plate, one end of each first fixing plate extends into one wave trough on the outer side of the corrugated pipe, a limiting block is detachably installed between the other end of each first fixing plate and the corresponding first bearing plate, and a first sealing gasket corresponding to the upper end pipe is arranged on the surface, facing the first fixing plate, of the first bearing plate;

and the locking assemblies are connected to the peripheries of the first bearing plate and the second bearing plate at intervals and used for connecting and fixing the upper tool assembly and the lower tool assembly after being installed.

2. The expansion joint performance detection apparatus according to claim 1,

a first through hole is formed in the middle of the first bearing plate and the first fixing plate and used for penetrating a first bolt;

the lower tool assembly further comprises: the base is arranged on the bottom side of the first bearing plate, a threaded hole is formed in one side, facing the first bearing plate, of the base, and the first bolt is in threaded connection with the threaded hole of the base.

3. The expansion joint performance detection apparatus according to claim 1,

the second bearing plate and the plurality of second fixing plates are correspondingly provided with second through holes for connecting second bolts, and the screw rods of the second bolts penetrate out of the second through holes of the second bearing plates and are in threaded connection with locking nuts.

4. The expansion joint performance detection apparatus according to claim 1,

the second fixing plate comprises a supporting end and a limiting end which are opposite, the supporting end extends to the outer side of the corrugated pipe and is located in a wave trough at the top, and the shape and the size of the supporting end are matched with those of the wave trough of the corrugated pipe.

5. The expansion joint performance detection device according to claim 4,

the second fixed plate the spacing end with the second bearing plate is relative is provided with the adaptation on the surface respectively the spacing groove of stopper, the stopper is inlayed respectively in corresponding in vertical two relative tip respectively the spacing inslot.

6. The expansion joint performance detection apparatus according to claim 4,

a plurality of first annular grooves are formed in the surface, facing the first fixing plate, of the first bearing plate at intervals from the middle to the outer edge, the lower tool assembly comprises a plurality of first sealing gaskets which are respectively matched with the plurality of first annular grooves so as to be matched with the lower end pipes with different sizes, and the first sealing gaskets are detachably mounted in the corresponding first annular grooves;

the second bearing plate orientation the second fixed plate is provided with multichannel second annular by middle part to outer edge interval on the surface, it includes a plurality of difference adaptations to go up the frock subassembly multichannel second annular the second is sealed to fill up to the not unidimensional of adaptation upper end pipe, the sealed demountable installation of pad in the second corresponds.

7. The expansion joint performance detection apparatus according to claim 6,

the number of the first fixing plates is multiple, and the diameters of the first fixing plates are different from each other so as to adapt to the lower end pipes with different sizes.

8. The expansion joint performance detection apparatus according to claim 6,

the limiting block is a telescopic piece, and the distance between two opposite end parts in the longitudinal direction of the limiting block is adjustable so as to adapt to the expansion joints with different sizes;

the second fixing plate is a telescopic piece, and the distance between the supporting end and the limiting end is adjustable so as to adapt to the expansion joints with different sizes.

9. The expansion joint performance detection apparatus according to claim 6,

the number of the second fixing plate and the number of the limiting blocks are respectively multiple, the distance between the supporting end and the limiting end of the second fixing plate is different from each other, and the longitudinal size of the limiting blocks is different from each other so as to adapt to the expansion joints with different sizes.

10. The expansion joint performance detection apparatus according to claim 1,

the number of the second fixing plate and the number of the limiting blocks are respectively at least 6.

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