CN214309875U

CN214309875U - Pipe ring rigidity test device

Info

Publication number: CN214309875U
Application number: CN202023084639.2U
Authority: CN
Inventors: 徐鑫
Original assignee: Shanghai Fubao Building Materials Co ltd
Current assignee: Shanghai Fubao Building Materials Co ltd
Priority date: 2020-12-19
Filing date: 2020-12-19
Publication date: 2021-09-28
Anticipated expiration: 2030-12-19

Abstract

The utility model relates to a tubular product ring rigidity test device, which comprises a frame, the workstation of setting in the frame, the pressure platform of setting in the frame slides, be equipped with the actuating mechanism that the drive platen slided along vertical direction in the frame, still include the first slider of two relative settings, the second slider of double-phase relative setting, be equipped with the piece that supports that is used for butt tubular product ring side wall on the first slider, be equipped with on the second slider and be used for fixing the lateral wall edge of tubular product ring on the workstation and compress tightly the piece, the upper surface of workstation is equipped with the first spout that supplies first slider to slide respectively, the second spout that supplies the second slider to slide, be equipped with the cavity that is linked together with first spout and second spout in the workstation, be equipped with the roll adjustment subassembly that is used for adjusting interval between first slider and the second slider in the cavity. This application has when detecting tubular product ring, can be with tubular product ring remain stable and avoid influencing the effect of experimental structure degree of accuracy.

Description

Pipe ring rigidity test device

Technical Field

The application relates to the field of ring stiffness testing machines, in particular to a pipe ring stiffness testing device.

Background

The ring stiffness testing machine is widely applied to the measurement of ring stiffness of thermoplastic plastic pipelines and glass fiber reinforced plastic pipes with annular cross sections, meets the requirements of PE double-wall corrugated pipes, winding pipes and various pipe standards, and can complete the tests of pipe ring stiffness, ring flexibility, flatness, bending, weld joint stretching and the like.

Chinese patent with publication number CN205898556U discloses a pipe ring stiffness test device, which comprises a workbench, an upper beam, a middle beam, a guide rod, a lead screw nut pair and a driving mechanism, wherein the upper beam is positioned above the workbench, the lower ends of a lead screw of the lead screw nut pair and the guide rod are connected with the workbench, and the upper end of the lead screw nut pair is connected with the upper beam; the middle cross beam is positioned between the workbench and the upper cross beam, the guide rod penetrates through a guide hole correspondingly arranged on the middle cross beam, a nut of the screw-nut pair is rotationally connected to the middle cross beam, the driving mechanism is arranged on the middle cross beam, and the nut of the screw-nut pair is connected with the driving mechanism to drive the middle cross beam to move up and down; the middle cross beam is connected with a force sensor; the test equipment runs stably and does not shake at high speed when in detection.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: when the test equipment is used, the pipe ring is placed on the workbench, the driving mechanism is used for driving the screw-nut pair to rotate, the middle cross beam is driven to press downwards, so that the pipe ring is tested, the pipe ring is directly placed on the workbench to be tested, the pipe ring is easy to slide, and the accuracy of test data is influenced.

SUMMERY OF THE UTILITY MODEL

In order to improve the problem that the easy slip of tubular product ring influences the test result accuracy when experimental, this application provides a tubular product ring rigidity test device.

The application provides a tubular product ring rigidity test device adopts following technical scheme:

the utility model provides a tubular product ring rigidity test device, includes the frame, sets up workstation in the frame, slides and set up the pressure platform in the frame, be equipped with the actuating mechanism that the drive pressure platform slided along vertical direction in the frame, its characterized in that: still include the first slider of two relative settings, the double-phase second slider that sets up relatively, be equipped with the piece that supports that is used for butt tubular product ring lateral wall on the first slider, be equipped with on the second slider and be used for fixing the lateral wall edge of tubular product ring on the workstation and compress tightly the piece, the upper surface of workstation is equipped with the first spout that supplies first slider to slide, supplies the second spout that the second slider slided respectively, be equipped with the cavity that is linked together with first spout and second spout in the workstation, be equipped with the roll adjustment subassembly that is used for adjusting interval between two first sliders and interval between two second sliders in the cavity.

By adopting the technical scheme, the pipe ring is placed on the workbench, then the distance between the first sliding block and the second sliding block is driven to be gradually reduced by the distance adjusting assembly, and then the two abutting pieces can be abutted against the circumferential wall of the pipe ring, so that the positioning and clamping of the pipe ring are realized, meanwhile, the pressing piece moves to one side of the axial direction of the pipe ring, the edge of the side wall of the pipe ring is pressed on the workbench by the pressing piece, the fixing of the pipe ring is realized, at the moment, the driving mechanism can be used for driving the pressing table to move downwards, and the pressing table applies pressure to the pipe ring so as to realize the rigidity test of the pipe ring; the test device with the structure has the advantages that the pipe ring is clamped and fixed, so that the pipe ring is prevented from being deviated in the test process, and the accuracy of the test result is improved.

Optionally, the abutting piece comprises an abutting plate arranged on the upper surface of the first sliding block, the bottom of the abutting plate is hinged to the upper surface of the first sliding block through a torsion spring, a groove is formed in the upper surface of the first sliding block, and a positioning piece used for fixing the abutting plate is arranged in the groove.

Through adopting above-mentioned technical scheme, along with pressing the platform to the pushing down of tubular product ring, the tubular product ring takes place deformation, and then before experimental, utilize the torsional spring can keep vertical state with supporting the board, fix a position the centre gripping to the tubular product ring in advance through supporting the board, avoid tubular product ring to take place the removal phenomenon, so that the lower surface butt of pressing the platform is at the top of tubular product ring, then personnel rotate and support the board, will support the board and change into the horizontality from vertical state, utilize the setting element will support the board and fix at the horizontality, push down through pressing the platform this moment, can carry out rigidity test to the tubular product ring and detect.

Optionally, the positioning piece comprises a magnet arranged on the side wall of the abutting plate and an iron block arranged in the groove, and the magnet is adsorbed on the side wall of the iron block.

Through adopting above-mentioned technical scheme, will support the board and change into the horizontality by vertical attitude for the magnet adsorbs on the iron plate, and then can stably keep supporting the board at the horizontality, so that the platen pushes down, tests the detection to the tubular product ring is stable.

Optionally, the pressing member includes a support plate disposed on a side wall of the second slider, a pressing plate mounted on a side wall of the support plate, and an air cylinder driving the pressing plate to ascend and descend, a cylinder body of the air cylinder is mounted on a side wall of the support plate, a piston rod of the air cylinder is connected with an upper surface of the pressing plate, and a rubber pad is adhered to a lower surface of the pressing plate and clings to an inner pipe wall of the pipe ring.

Through adopting above-mentioned technical scheme, when the second slider removed to the both sides of tubular product ring axial direction, start the cylinder, the piston rod of cylinder stretches out, and the drive pressure strip moves down for the rubber pad tightly supports at the interior rampart edge of tubular product ring, and then can fix the tubular product ring on the workstation, avoids when experimental, and the skew takes place for the tubular product ring, has improved the stability to tubular product ring test process.

Optionally, the roll adjustment subassembly includes the linkage piece, slides first voussoir and the second voussoir of being connected and the electric jar that the drive linkage piece goes up and down with the lateral wall of linkage piece respectively, the inner diapire at the cavity is installed to the cylinder body of electric jar, the piston rod of electric jar links to each other with the bottom of linkage piece, the lateral wall of linkage piece is equipped with the direction domatic that supplies first voussoir and second voussoir to slide, the domatic lower one end of direction is towards the inner diapire of cavity, the domatic higher one end of direction is towards the interior roof of cavity, the bottom at first slider is fixed to first voussoir, the bottom at the second slider is fixed to the second voussoir.

By adopting the technical scheme, the electric cylinder is started, the piston rod of the electric cylinder retracts to drive the linkage block to move downwards, and the first wedge block and the second wedge block are connected with the linkage block in a sliding manner, and the first sliding groove plays a role in guiding and limiting the sliding of the first sliding block and the second sliding groove plays a role in guiding and limiting the sliding of the second sliding block, so that along with the downward movement of the linkage block, the distance between the first wedge block and the second wedge block is gradually reduced, the first sliding block and the second sliding block are driven to approach towards the direction of the pipe ring, the support plate is abutted against the circumferential wall of the pipe ring, and meanwhile, the support plate can be moved to one side of the axial direction of the pipe ring, so that the compression plate is compressed at the edge of the inner annular wall of the pipe ring; otherwise, the linkage block is driven to move upwards to drive the first sliding block and the second sliding block to approach in the direction away from the pipe ring, and the detected pipe ring can be taken out at the moment.

Optionally, the side walls of the first wedge block and the second wedge block are both provided with dovetail blocks, and dovetail grooves for sliding of the dovetail blocks are formed in the guide slope.

Through adopting above-mentioned technical scheme, the setting of forked tail piece and dovetail has realized dismantling between first voussoir, second voussoir and the linkage piece and is connected to along with the upper and lower removal of linkage piece, make the interval between first voussoir and the second voussoir reduce gradually or crescent.

Optionally, a connecting plate is arranged on a piston rod of the electric cylinder, the connecting plate is fixed on the bottom wall of the linkage block through a bolt, two ends of the dovetail groove penetrate through the top wall and the bottom wall of the linkage block respectively, and an access door is hinged to the side wall of the workbench.

Through adopting above-mentioned technical scheme, the setting of connecting plate and bolt has realized being connected dismantled between linkage piece and the electric jar, and the both ends of dovetail run through with the upper and lower surface of linkage piece respectively, and then personnel open the access door, removable linkage piece for the length dimension of linkage piece or the tubular product ring of the different size specifications of width dimension adaptation, so that when examining tubular product ring to different sizes, support board and extension board can both remove to suitable position, so that it is fixed to tubular product ring centre gripping.

Optionally, the both sides of workstation are equipped with blanking table, blanking table's upper surface slope is equipped with the unloading domatic, the lower one end of unloading domatic is towards ground, the higher one end of unloading domatic flushes with the upper surface of workstation.

Through adopting above-mentioned technical scheme, because the weight of tubular product ring is heavier, the setting of unloading platform makes things convenient for personnel to roll the tubular product ring to the workstation by the unloading is domatic on, makes things convenient for upper and lower unloading, has saved the manpower.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the distance between the first sliding block and the second sliding block is driven to be gradually reduced by the distance adjusting assembly, so that the two abutting pieces can be abutted against the circumferential wall of the pipe ring, positioning and clamping of the pipe ring are achieved, meanwhile, the pressing piece moves to one side of the axial direction of the pipe ring, the edge of the side wall of the pipe ring is pressed on the workbench by the pressing piece, fixing of the pipe ring is achieved, and the problem that the accuracy of a test result is influenced due to movement of the pipe ring when the pipe ring is detected is avoided;

2. the pipe ring is deformed along with the pressing of the pressing table, the pipe ring is positioned and clamped in advance through the abutting plate, the pipe ring is prevented from moving, so that the lower surface of the pressing table abuts against the top of the pipe ring, before a test, a worker rotates the abutting plate to change the abutting plate from a vertical state to a horizontal state, the abutting plate is fixed in the horizontal state through the positioning piece, and the pressing table is pressed downwards at the moment to perform rigidity test detection on the pipe ring;

3. along with the moving down of linkage piece for the interval between first voussoir and the second voussoir reduces gradually, and then drives first slider, second slider and all is close to tubular product ring direction, makes to support the board and contradict at the circumference wall of tubular product ring, can move the extension board to one side of tubular product ring axial direction simultaneously, so that when the piston rod of cylinder stretches out, can drive the pressure strip and move down, makes the rubber pad hug closely at the interior rampart edge of tubular product ring, with the realization to the location centre gripping of tubular product ring.

Drawings

FIG. 1 is a front view of a pipe ring rigidity testing device in an embodiment of the present application.

FIG. 2 is a schematic view showing the tubing ring positioned on the table.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

Fig. 4 is a sectional view taken along line B-B in fig. 2.

Description of reference numerals: 1. a frame; 2. a work table; 3. pressing the table; 4. a drive mechanism; 5. a first slider; 6. a second slider; 7. an abutting piece; 71. a resisting plate; 72. a groove; 73. a magnet; 74. an iron block; 8. a compression member; 81. a support plate; 82. a compression plate; 83. a cylinder; 84. a rubber pad; 9. a first chute; 10. a second chute; 11. a cavity; 12. a distance adjusting component; 121. a linkage block; 122. a first wedge; 123. a second wedge; 124. an electric cylinder; 125. guiding the slope surface; 13. a dovetail block; 14. a dovetail groove; 15. a connecting plate; 16. a bolt; 17. an access door; 18. a blanking table; 19. a blanking slope; 20. a tubing ring; 21. and connecting the grooves.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a pipe ring rigidity test device. Referring to fig. 1, the testing device includes a frame 1, on the frame 1 and along the direction of height be equipped with workstation 2 and pressure platform 3 relatively, workstation 2 is located the below of pressing platform 3, it has the experimental space that is used for detecting tubular product ring 20 to enclose to close between pressure platform 3 and the workstation 2, workstation 2 is used for the bearing to wait to detect tubular product ring 20, the length direction of workstation 2 and the radial syntropy of tubular product ring 20, the width direction of workstation 2 and the axial syntropy of tubular product ring 20, be equipped with drive pressure platform 3 along the actuating mechanism 4 that the direction of height slided on the frame 1, exert pressure to tubular product ring 20 through pressing platform 3, in order to realize the experimental detection of the rigidity to tubular product ring 20.

Referring to fig. 1, the length direction's of workstation 2 both sides are equipped with unloading platform 18, and the upper surface slope of unloading platform 18 is equipped with the domatic 19 of unloading, and the lower one end of the domatic 19 of unloading is towards ground, and the higher one end of the domatic 19 of unloading flushes with the upper surface of workstation 2, and when the weight of tubular product ring 20 was heavier, personnel can roll tubular product ring 20 to workstation 2 by the domatic 19 of unloading on, make things convenient for the material loading and unloading.

Referring to fig. 1 and 2, in order to avoid the phenomenon that the pipe ring 20 slides when detecting the pipe ring 20, two first sliders 5 parallel to each other are arranged on the workbench 2 and slide along the length direction of the workbench 2, a first chute 9 for the first slider 5 to slide is arranged on the upper surface of the workbench 2, a fastening piece 7 for abutting against the side wall of the pipe ring 20 is arranged on the upper surface of the first slider 5, two second sliders 6 parallel to each other are arranged on the workbench 2 and slide along the width direction of the workbench 2, a pressing piece 8 for fixing the edge of the side wall of the pipe ring 20 on the workbench 2 is arranged on the upper surface of the second slider 6, a second chute 10 for the second slider 6 to slide is arranged on the upper surface of the workbench 2, a cavity 11 is arranged inside the workbench 2, the cavity 11 and the first chute 9, the second sliding grooves 10 are communicated, and a distance adjusting assembly 12 for adjusting the distance between the two first sliding blocks 5 and the distance between the two second sliding blocks 6 is arranged in the cavity 11.

During the experiment, utilize the distance between first slider 5 of roll adjustment subassembly 12 regulation and the second slider 6, when the interval between first slider 5 and the second slider 6 reduces gradually, first slider 5 and second slider 6 all are close to the tubular product ring 20 direction this moment, and then two butt piece 7 butts at the circumference wall of tubular product ring 20, realized the centre gripping location to tubular product ring 20, two hold-down pieces 8 are close to tubular product ring 20 direction simultaneously, utilize hold-down piece 8 to fix the bottom lateral wall edge of tubular product ring 20 on workstation 2, finally realized fixing to tubular product ring 20, avoid when experimental, tubular product ring 20 slides and influences the accuracy of test data, test precision and efficiency have been improved.

Referring to fig. 2 and 3, the abutting member 7 includes an abutting plate 71 vertically arranged, the bottom end of the abutting plate 71 is hinged to the upper surface of the first slider 5 through a torsion spring, a groove 72 is formed in the upper surface of the first slider 5, a positioning member for fixing the abutting plate 71 is arranged in the groove 72, and the abutting plate 71 abuts against the circumferential wall of the pipe ring 20 during detection so as to clamp and position the pipe ring 20 and prevent the pipe ring 20 from rolling; when the pressing platform 3 presses down the pipe ring 20 for detection, the pipe ring 20 deforms, so that when the lower surface of the pressing platform 3 abuts against the upper surface of the pipe ring 20, the abutting plate 71 is rotated to change the abutting plate 71 from a vertical state to a horizontal state, the abutting plate 71 is fixed by the positioning piece, and the pipe ring 20 can be stably detected.

Referring to fig. 3, the positioning member includes an iron block 74 disposed on a bottom wall of the groove 72 opposite to the notch thereof, a magnet 73 is adsorbed on the iron block 74, the magnet 73 is disposed on a side wall of the abutting plate 71 facing away from the pipe ring 20, and the abutting plate 71 can be kept in a horizontal state by cooperation of the magnet 73 and the iron block 74, so as to perform a stability test on the pipe ring 20.

Referring to fig. 2 and 4, the pressing member 8 includes a supporting plate 81 fixedly disposed on the upper surface of the second slider 6, an air cylinder 83 is disposed on one side of the supporting plate 81, a cylinder body of the air cylinder 83 is mounted on a side wall of the supporting plate 81, a piston rod of the air cylinder 83 is connected with a pressing plate 82, the air cylinder 83 is started, the pressing plate 82 is driven to move downwards, so that the pressing plate 82 tightly abuts against the edge of the inner wall of the pipe ring 20, a rubber pad 84 is adhesively disposed on the lower surface of the pressing plate 82 and tightly adheres to the inner wall of the pipe, the rubber pad 84 is disposed, the tightness of the adhesion between the pressing plate 82 and the inner wall of the pipe ring 20 is enhanced, and the stability of fixing the pipe ring 20 is improved.

Referring to fig. 3 and 4, the distance adjusting assembly 12 includes a linkage block 121 located in the cavity 11, two side walls of the linkage block 121 are slidably connected with first wedges 122, the two first wedges 122 are respectively corresponding to the two first sliders 5 one by one, the top of the first wedge 122 is fixedly connected to the bottom of the first slider 5, the other two side walls of the linkage block 121 are slidably connected with second wedges 123, the two second wedges 123 are respectively corresponding to the two second sliders 6 one by one, the top of the second wedge 123 is fixedly connected to the bottom of the second slider 6, the two first wedges 122 and the two second wedges 123 are arranged oppositely, the peripheral side walls of the linkage block 121 are respectively provided with a guide slope 125 for the first wedge 122 and the second wedge 123 to slide, the lower end of the guide slope 125 faces the inner bottom wall of the cavity 11, the higher end of the guide slope 125 faces the inner top wall of the cavity 11, the side walls of the guide slope 125 are provided with a dovetail groove 14 along the self-tilting direction, the side walls of the first wedge 122 and the second wedge 123 are provided with dovetail blocks 13, the dovetail blocks 13 slide in the dovetail grooves 14, and sliding connection among the first wedge 122, the second wedge 123 and the linkage block 121 is achieved.

Be equipped with electric cylinder 124 in the cavity 11, the inner diapire at cavity 11 is installed to the cylinder body of electric cylinder 124, the piston rod of electric cylinder 124 links to each other with linkage block 121's bottom, electric cylinder 124 is used for driving linkage block 121 to go up and down, when drive linkage block 121 descends, because the domatic 125 setting of direction, and first spout 9 plays the guide effect to the sliding of first slider 5, second spout 10 plays the guide effect to the sliding of second slider 6, and then the interval between two first voussoirs 122 and two second voussoirs 123 reduces gradually, thereby it all is close to tubular product ring 20 direction to drive holding member 7 and compressing tightly piece 8, in order to realize the fixed to tubular product ring 20, the stability to tubular product ring 20 test process has been improved.

Referring to fig. 2 and 4, when the pipe rings 20 with different diameters need to be inspected, the first wedge 122 or the second wedge 123 may be adjusted to a proper position for replacing the linkage block 121 with a corresponding length or width, so that the tightening member 7 or the pressing member 8 can inspect the pipe rings 20 with different sizes.

The articulated access door 17 that is connected with of lateral wall of workstation 2, the piston rod of electric jar 124 is equipped with connecting plate 15, linkage block 121's bottom is equipped with connecting groove 21, connecting plate 15 passes through bolt 16 to be fixed at connecting groove 21 and the relative groove diapire of its notch, connecting plate 15 and bolt 16's setting, the dismantlement between electric jar 124 and the linkage block 121 has been realized and has been connected, both ends when dovetail 14 run through the setting with linkage block 121's roof and diapire respectively, so that take out dovetail block 13 from dovetail 14, and then make things convenient for personnel to change linkage block 121.

The implementation principle of the pipe ring stiffness test device in the embodiment of the application is as follows: firstly, a person rolls a pipe ring 20 to be detected from the blanking table 18 to the surface of the workbench 2, then the electric cylinder 124 is started, a piston rod of the electric cylinder 124 retracts to drive the linkage block 121 to move downwards, due to the arrangement of the guide slope 125, the two first wedge blocks 122 and the two second wedge blocks 123 are driven to approach each other, the first sliding block 5 is driven to slide in the first sliding groove 9, the second sliding block 6 slides in the second sliding groove 10, the two abutting plates 71 can be tightly abutted to two sides of the circumferential wall of the pipe ring 20, positioning and clamping of the pipe ring 20 are achieved, the two supporting plates 81 can be moved to two sides of the pipe ring 20 in the axial direction, the air cylinder 83 is started again, the piston rod of the air cylinder 83 extends out to drive the pressing plate 82 to move downwards, and the pipe ring 20 can be fixed on the workbench 2 until the rubber pad 84 is tightly abutted to the edge of the inner wall of the pipe ring 20.

Then, the driving mechanism 4 is used for driving the pressing table 3 to move downwards until the lower surface of the pressing table 3 is abutted against the peripheral wall of the pipe ring 20, the driving of the pressing table 3 is stopped, at the moment, the personnel rotate the abutting plate 71 to enable the abutting plate 71 to be in a vertical state and a horizontal state, so that the magnet 73 is adsorbed on the iron block 74, the abutting plate 71 can be kept in a horizontal state, at the moment, the driving mechanism 4 can be used for driving the pressing table 3 to continuously move downwards, and the detection of the pipe ring 20 can be realized.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a tubular product ring rigidity test device, includes frame (1), workstation (2) of setting in frame (1), slides and set up pressure platform (3) in frame (1), be equipped with drive pressure platform (3) on frame (1) and follow actuating mechanism (4) that vertical direction slided, its characterized in that: still include two first sliders (5) that set up relatively, two second sliders (6) that set up relatively, be equipped with on first slider (5) and be used for butt tubular product ring (20) lateral wall to support piece (7), be equipped with on second slider (6) and be used for fixing lateral wall edge of tubular product ring (20) on workstation (2) compressing tightly piece (8), the upper surface of workstation (2) is equipped with respectively and supplies first spout (9) that first slider (5) slided, supplies second spout (10) that second slider (6) slided, be equipped with cavity (11) that are linked together with first spout (9) and second spout (10) in workstation (2), be equipped with in cavity (11) and be used for adjusting the roll adjustment subassembly (12) of interval between two first sliders (5) and interval between two second sliders (6).

2. The pipe ring stiffness test device of claim 1, wherein: the abutting piece (7) comprises an abutting plate (71) arranged on the upper surface of the first sliding block (5), the bottom of the abutting plate (71) is hinged to the upper surface of the first sliding block (5) through a torsion spring, a groove (72) is formed in the upper surface of the first sliding block (5), and a positioning piece used for fixing the abutting plate (71) is arranged in the groove (72).

3. The pipe ring stiffness test device of claim 2, wherein: the positioning piece comprises a magnet (73) arranged on the side wall of the abutting plate (71) and an iron block (74) arranged in the groove (72), and the magnet (73) is adsorbed on the side wall of the iron block (74).

4. The pipe ring stiffness test device of claim 1, wherein: the pressing piece (8) comprises a support plate (81) arranged on the side wall of the second sliding block (6), a pressing plate (82) arranged on the side wall of the support plate (81), and an air cylinder (83) for driving the pressing plate (82) to ascend and descend, the cylinder body of the air cylinder (83) is arranged on the side wall of the support plate (81), the piston rod of the air cylinder (83) is connected with the upper surface of the pressing plate (82), and a rubber pad (84) is adhered to the lower surface of the pressing plate (82) and tightly attached to the inner pipe wall of the pipe ring (20).

5. The pipe ring stiffness test device of claim 1, wherein: the distance adjusting assembly (12) comprises a linkage block (121), a first wedge block (122) and a second wedge block (123) which are connected with the side wall of the linkage block (121) in a sliding mode respectively, and an electric cylinder (124) for driving the linkage block (121) to ascend and descend, wherein the cylinder body of the electric cylinder (124) is installed on the inner bottom wall of the cavity (11), the piston rod of the electric cylinder (124) is connected with the bottom of the linkage block (121), the side wall of the linkage block (121) is provided with a guide slope surface (125) for the first wedge block (122) and the second wedge block (123) to slide, the lower end of the guide slope surface (125) faces the inner bottom wall of the cavity (11), the higher end of the guide slope surface (125) faces the inner side of the cavity (11), the first wedge block (122) is fixed to the bottom of the first sliding block (5), and the second wedge block (123) is fixed to the top wall of the second sliding block (6).

6. The pipe ring stiffness test device of claim 5, wherein: the lateral walls of the first wedge block (122) and the second wedge block (123) are both provided with dovetail blocks (13), and dovetail grooves (14) for the dovetail blocks (13) to slide are formed in the guide slope surfaces (125).

7. The pipe ring stiffness test device of claim 6, wherein: the piston rod of electricity jar (124) is equipped with connecting plate (15), the diapire at linkage block (121) is fixed through bolt (16) in connecting plate (15), the both ends of dovetail (14) run through with the roof and the diapire of linkage block (121) respectively, the lateral wall of workstation (2) is articulated to be connected with access door (17).

8. The pipe ring stiffness test device of claim 1, wherein: the both sides of workstation (2) are equipped with unloading platform (18), the upper surface slope of unloading platform (18) is equipped with the domatic (19) of unloading, the lower one end of the domatic (19) of unloading is towards ground, the higher one end of the domatic (19) of unloading flushes with the upper surface of workstation (2).