CN213181088U - Pipe bending fatigue test device and equipment - Google Patents

Abstract

The application discloses a pipe bending fatigue test device, which relates to the technical field of aviation hydraulic pipe tests and comprises a base, wherein a clamping assembly and a bending assembly are arranged on the base; the clamping assembly comprises a clamping seat arranged on the base and a clamping piece arranged on the clamping seat; the bending assembly comprises a mounting seat arranged on the base, a rotating piece rotationally connected to the mounting seat, and a driving piece connected with the rotating piece and driving the rotating piece to rotate; wherein, the rotation piece is equipped with the conflict face near one side of holder, and the conflict face sets up to make the reciprocal bending of work piece after work piece one end is fixed by the holder, and rotate the rotation in-process. Set up centre gripping subassembly and crooked subassembly, realize the fatigue test to the pipe, and make fatigue test's operation more convenient.

Description

Pipe bending fatigue test device and equipment

Technical Field

The application relates to the technical field of aviation hydraulic conduit tests, in particular to a conduit bending fatigue test device and equipment.

Background

After the aviation hydraulic guide pipe is developed, relevant standard tests are required to ensure the reliability of the quality of the developed product.

The pipe bending fatigue test is one of standard test methods of aviation hydraulic pipes, namely, the condition that whether the pipe is cracked or leaked is observed under the action of 1000 ten thousand specific alternating stress cycles of the developed pipe, so as to judge whether the developed pipe is qualified. However, at present, no suitable test equipment is available, so that the operation of the conduit bending fatigue test is not started, and the design of a conduit bending fatigue test device is urgent.

SUMMERY OF THE UTILITY MODEL

In order to carry out pipe bending fatigue test, this application provides a pipe bending fatigue test device.

The application provides a pipe bending fatigue test device adopts following technical scheme:

a pipe bending fatigue test device comprises a base, wherein a clamping assembly and a bending assembly are arranged on the base;

the clamping assembly comprises a clamping seat arranged on the base and a clamping piece arranged on the clamping seat;

the bending assembly comprises a mounting seat arranged on the base, a rotating part rotationally connected to the mounting seat, and a driving part connected with the rotating part and driving the rotating part to rotate;

wherein, rotate one side that is close to the holder and be equipped with the conflict face, the conflict face sets up to make the reciprocal bending of work piece at rotation in-process after work piece one end is fixed by the holder.

Through above-mentioned technical scheme, it is fixed with the one end centre gripping of work piece, then start the driving piece, the other end of work piece rotates the in-process and promotes the work piece through the conflict face and take place radial offset rotating, rotates the in-process and realizes reciprocating bending and carry out fatigue test rotating. Set up centre gripping subassembly and crooked subassembly, realize the fatigue test to the pipe, and make fatigue test's operation more convenient.

Optionally, the clamping piece comprises a connecting block in threaded connection with one axial end of the workpiece, and a pressing block arranged on the mounting seat and used for fixing the connecting block.

Through above-mentioned technical scheme, the connecting block is fixed through the compact heap, and connecting block and work piece threaded connection can change the connecting block according to the condition of work piece during the in-service use to make testing device's use more convenient.

Optionally, the connecting block comprises a block body which is used for being in threaded connection with one axial end of the workpiece and a pressing plate which is fixed on the outer side wall of the block body;

the pressing block comprises a first pressing portion and a second pressing portion, the first pressing portion and/or the second pressing portion are/is fixed on the clamping seat through bolts, and the pressing block is matched with the first pressing portion and the second pressing portion and used for pressing the end face, far away from the clamping seat, of the pressing plate so that the connecting block is fixed on the clamping seat.

Through above-mentioned technical scheme, when needs are changed the connecting block, dismantle the compact heap through unscrewing the bolt to the convenience is changed the connecting block, in addition, in order to ensure the degree of screwing up of work piece and connecting block, also can pull out the connecting block from the grip slipper earlier, screws up with the work piece earlier and is connected, then compresses tightly the clamp plate with fixed through first portion and the second portion that compresses tightly with this connecting block. Set up clamp plate, first portion and the second portion that compresses tightly for the installation of connecting block is more convenient.

Optionally, the crooked subassembly still includes the connector, the connector is used for threaded connection in the one end that the holder was kept away from to the work piece, the one end that rotates the piece and be close to the holder is equipped with rotates the groove, rotate the groove and supply the connector to stretch into, just the connector rotates to be connected in rotating the inslot, the axis of rotation of connector with the axis of rotation of rotating does not coincide and sets up, the conflict face does the inside wall that rotates the groove.

Through above-mentioned technical scheme, set up the connector, contact through connector and conflict face, reduce in the test process because the work piece and the experimental error that conflict face wearing and tearing lead to make the test result of work piece more accurate. In addition, the rotation through rotating the groove is connected for it is more stable to rotate the connection of conflict face and connector when rotating, makes the experiment more stable.

Optionally, the connector is used for plugging an end portion corresponding to the workpiece; the connecting block is provided with a through hole which is used for being communicated with the inside of the workpiece, and the through hole is used for being communicated to the pressurizing device.

According to the technical scheme, the channel in the workpiece is pressurized through the through hole by the pressurizing device, and the pressurizing device can be an air source such as an air pump or an air storage tank and is pressurized through air; the hydraulic pump may be a hydraulic pump that pressurizes the fluid. Can carry out real-time control to the gas leakage condition of work piece through pressure device, can the state of damage in the accurate measurement work piece fatigue test for fatigue test's result is more accurate.

Optionally, the rotation piece including rotate connect the rotation seat on the mount pad, slide and connect the regulation seat on rotating the seat and set up and be used for adjusting the fixed mounting of seat rigidity on adjusting the seat, the direction of sliding perpendicular to of adjusting the seat rotates the axis setting of rotating of seat, just it sets up to rotate the groove adjust on the seat.

Through the technical scheme, the position of the rotating groove on the adjusting seat can be adjusted according to the actual bending amount, so that the testing device is more convenient to use.

Optionally, the clamping assembly and the bending assembly can move in a direction close to or away from each other, and the base is further provided with an adjusting piece, and the adjusting piece is used for adjusting the distance between the clamping seat and the mounting seat.

Through above-mentioned technical scheme, the distance between grip slipper and the mount pad is realized adjustable, can adjust according to the length of actual work piece for holistic use is more convenient.

Optionally, the base is connected with a sliding seat in a sliding manner, and the clamping seat is fixed on the sliding seat and arranged on the base through the sliding seat;

the adjusting piece is an adjusting screw rod which is rotatably connected to the base and is in threaded connection with the sliding seat.

Through the technical scheme, the position of the sliding seat is adjusted by rotating the adjusting screw rod, so that the distance between the clamping seat and the mounting seat is adjusted, and the whole use is more convenient.

Optionally, the base is further provided with a positioning assembly, and the positioning assembly comprises a positioning rod, a first chuck arranged on the sliding seat, and a second chuck arranged on the base; the positioning rod is arranged such that when the workpiece is clamped by the clamping assembly and bent by the bending assembly, one end of the positioning rod is clamped by the first chuck and the other end is clamped by the second chuck.

Through above-mentioned technical scheme, accommodate the lead screw and the seat threaded connection that slides, the thread clearance makes can produce the ascending skew of axial in the test process. The distance between the clamping seat and the mounting seat can be further limited through the positioning assembly, so that the distance between the clamping seat and the mounting seat is more stable in the fatigue test process of the workpiece, the axial offset generated in the test process of the workpiece due to the axial force is reduced, and the whole test is more stable.

A pipe fatigue test device comprises any one of the pipe bending fatigue test device;

the workpiece loading and unloading device is characterized by further comprising a shell, wherein an opening through which a workpiece passes during loading and unloading is formed in the shell, and a housing used for covering the opening is connected to the shell in a sliding mode.

Through the technical scheme, the workpiece in the test process can be isolated through the housing, so that the whole test process is safer.

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

(1) by arranging the clamping assembly and the bending assembly, the fatigue test of the conduit is realized, and the operation of the fatigue test is more convenient;

(2) by arranging the connector, the test error caused by abrasion of the workpiece and the abutting surface in the test process is reduced, so that the test result of the workpiece is more accurate; in addition, the test is more stable through the rotary connection of the rotary groove;

(3) through setting up locating component, reduced the work piece because the influence of axial force for holistic experiment is more stable.

Drawings

FIG. 1 is a schematic structural diagram of a pipe bending fatigue testing apparatus according to a first embodiment;

FIG. 2 is a schematic structural view of a clamping assembly according to a first embodiment;

FIG. 3 is a partial cross-sectional view of a clamping assembly according to a first embodiment;

FIG. 4 is a schematic structural diagram of a bending element according to a first embodiment;

FIG. 5 is an exploded view of the rotor according to the first embodiment;

FIG. 6 is a schematic illustration of a partial explosion of one of the workpieces according to the first embodiment;

FIG. 7 is a schematic structural diagram of a bending assembly according to a second embodiment;

FIG. 8 is a schematic structural view of another bending element according to the second embodiment;

fig. 9 is a schematic view of a partial explosion of a catheter fatigue testing apparatus.

Reference numerals: 1. a base; 2. a clamping assembly; 21. a clamping seat; 22. a clamping member; 221. connecting blocks; 2211. a block body; 2212. pressing a plate; 222. a compression block; 2221. a first pressing part; 2222. a second pressing part; 3. a bending assembly; 31. a mounting seat; 32. a rotating member; 321. a rotating seat; 322. an adjusting seat; 323. a fixing member; 33. a drive member; 34. a connector; 4. a positioning assembly; 41. positioning the rod piece; 42. a first chuck; 43. a second chuck; 5. a sliding seat; 6. an adjustment member; 7. an adjustment hole; 8. a rotating groove; 9. a contact surface; 10. a through hole; 11. an accumulator; 12. a housing; 13. an opening; 14. a housing; 15. a circular groove; 16. a bump; 17. a connecting pipe; 18. a control valve; 19. a detection member; 201. a pipe body; 202. a connecting section; 203. a threaded sleeve; 204. an elastic sealing ring; 205. a limit ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses a pipe bending fatigue test device.

The first embodiment is as follows:

as shown in fig. 1, comprises a base 1, a clamping assembly 2, a bending assembly 3 and a positioning assembly 4.

As shown in figure 1, the upper end surface of the base 1 is connected with a sliding seat 5 in a sliding manner along the horizontal direction, the base 1 is further provided with an adjusting piece 6, and the adjusting piece 6 is an adjusting screw rod which is rotatably connected to the base 1 and is in threaded connection with the sliding seat 5. The axis of the adjusting piece 6 is horizontal and parallel to the sliding direction of the sliding seat 5, a hand wheel is fixed at one axial end of the adjusting piece 6, and the hand wheel is rotated to drive the adjusting screw rod so as to drive the sliding seat 5 to slide.

Among centre gripping subassembly 2 and the crooked subassembly 3, one of them sets up and follows the seat 5 that slides on the seat 5 that slides, and another sets up on base 1 and is located the seat 5 path that slides to make the distance between centre gripping subassembly 2 and the crooked subassembly 3 realize adjustable. Alternatively, two sliding seats 5 may be provided, the sliding directions of the two sliding seats 5 are close to or far away from each other, the clamping assembly 2 and the bending assembly 3 are respectively provided corresponding to one sliding seat 5, and the distance between the clamping assembly 2 and the bending assembly 3 can be adjusted. In this embodiment, the clamping assembly 2 is disposed on the upper end surface of the sliding seat 5, the clamping assembly 2 is disposed on the base 1 through the sliding seat 5, and the bending assembly 3 is directly disposed on the base 1.

As shown in fig. 2, the clamping assembly 2 includes a clamping seat 21 fixed on the upper end surface of the sliding seat 5, and a clamping member 22 disposed on the clamping seat 21. The clamping member 22 includes a connecting block 221 and a pressing block 222 disposed on the mounting seat 31.

As shown in fig. 3, the connecting block 221 includes a block 2211 and a pressing plate 2212 fixed to the outer side wall of the block 2211, the block 2211 is cylindrical, a threaded hole is formed in one axial end of the block 2211, and the connecting block 221 is in threaded connection with one axial end of the workpiece through the threaded hole; the pressing plate 2212 is annular and fixed to the circumferential outer wall of the block 2211.

As shown in fig. 3, the pressing block 222 includes a first pressing portion 2221 and a second pressing portion 2222 disposed on the holder 21, and the first pressing portion 2221 and the second pressing portion 2222 are fixed to the holder 21 by corresponding bolts. The first pressing portion 2221 and the second pressing portion 2222 are connected in a circular ring shape and sleeved on the block 2211, and when the bolt is tightened, the first pressing portion 2221 and the second pressing portion 2222 abut against the end face, far away from the clamping base 21, of the pressing plate 2212 to fix the connecting block 221 on the clamping base 21. Alternatively, one of the first pressing portion 2221 and the second pressing portion 2222 is directly fixed to the holder 21 for positioning, and the other is fixed by screwing a bolt to fix the pressing plate 2212 to the end face of the holder 21 and fix the connecting block 221 to the holder 21.

As shown in fig. 1 and 2, the base 1 is further connected with a detecting member 19 in a sliding manner, and the sliding direction of the detecting member 19 is parallel to the sliding direction of the sliding seat 5. The detecting piece is positioned on one side of the clamping piece 22 far away from the clamping seat 21, the detecting piece 19 is a dial indicator, and the direction of the detecting end of the detecting piece is perpendicular to the sliding direction of the sliding seat. When a workpiece needs to be clamped by the clamping piece 22, the clamping piece 22 is not screwed down to lock the workpiece, the detection end of the detection piece 19 abuts against the circumferential outer wall of the workpiece, and the parallelism of the axis of the workpiece and the sliding direction of the sliding seat 5 can be detected and calibrated through the number indicating change of a dial indicator by rotating the workpiece, so that the clamping piece 22 is locked after the axis of the workpiece is aligned.

As shown in fig. 4, the bending assembly 3 includes a mounting base 31, a rotating member 32, a driving member 33, and a connecting head 34.

As shown in fig. 1 and 4, the mounting seat 31 is fixed to the upper end surface of the base 1 and is located in the extending direction of the sliding path of the sliding seat 5, and the mounting seat 31 is located on the side where the workpiece is clamped by the clamping assembly 2.

As shown in fig. 4 and 5, the rotating member 32 includes a rotating base 321 rotatably connected to the mounting base 31, an adjusting base 322 slidably connected to the rotating base 321, and a fixing member 323 disposed on the adjusting base 322. The rotation axis of the rotation seat 321 is parallel to the sliding direction of the sliding seat 5, two adjusting holes 7 are formed in the rotation seat 321, and the two adjusting holes 7 are elongated holes, and the length directions of the two adjusting holes are parallel to and perpendicular to the rotation axis direction of the rotation seat.

As shown in fig. 1 and 5, the adjusting seat 322 is located on one side of the rotating seat 321 close to the clamping assembly 2, one end of the adjusting seat 322 close to the clamping member 22 is provided with a rotating groove 8, and the rotating groove 8 is a cylindrical groove and has an axis parallel to the rotating axis of the rotating seat 321. The inner side wall of the rotating groove 8 is an interference surface 9.

As shown in fig. 5, the fixing member 323 is a bolt correspondingly disposed on the adjusting hole 7, the bolt passes through the adjusting hole 7 and is in threaded connection with the adjusting seat 322, the adjusting seat 322 is fixed by tightening the bolt, and when the bolt is loosened, the thread section of the bolt is located in the adjusting hole 7 to guide the sliding movement of the adjusting seat 322.

As shown in fig. 1 and fig. 4, the driving member 33 may be fixed on the mounting seat 31, or may be directly fixed on the base 1, the driving member 33 is a driving motor, such as a servo motor, a hydraulic motor, etc., an output shaft of the driving motor is connected to the rotating shaft of the rotating seat 321 through a shaft coupling, so as to drive the rotating seat 321 to rotate along its own axis to drive the adjusting seat 322 to rotate.

As shown in fig. 1 and 5, the connecting head 34 is used for being screwed to an end of the workpiece far away from the clamping member 22, and the connecting head 34 is used for plugging a corresponding end of the workpiece. One end of the connecting head 34 far away from the workpiece extends into the rotating groove 8, the connecting head 34 is rotatably connected in the rotating groove 8 through a bearing, and the rotating axis of the connecting head 34 is not overlapped with the rotating axis of the rotating part 32.

When the driving member 33 drives the adjusting seat 322 to rotate, the adjusting seat 322 rotates to turn the rotating groove 8 along the rotating axis of the rotating seat 321, the contact surface 9 in the rotating groove 8 drives the connecting head 34 to move through bearing transmission, and the moving of the connecting head 34 makes one end of the workpiece far away from the clamping assembly 2 generate radial deviation to realize reciprocating bending deformation.

As shown in fig. 1 and 3, the connecting block 221 further has a through hole 10, when the workpiece is connected to the connecting block 221, the through hole 10 is communicated with the internal channel of the workpiece, and an end of the through hole 10 away from the workpiece is used for communicating with a pressurizing device (not shown). The through-hole 10 may be directly connected to the pressurizing means through a connection pipe 17. Alternatively, a hole may be formed in the holder 21 to communicate with an end of the through-hole 10 remote from the workpiece, and the hole remote from the through-hole 10 is used to communicate with the pressurizing means through the connection pipe 17. Wherein, the grip slipper 21 is also provided with a digital pressure gauge, and the digital pressure gauge is communicated with the connecting pipe 17 and the inner channel of the workpiece. The end of the connecting pipe 17 far away from the clamping seat 21 is also communicated with a control valve 18, and the control valve 18 is a needle valve. The internal channel of the workpiece is communicated or disconnected with the pressurizing device through the opening and closing of the control valve 18.

When the control valve 18 is closed, a closed area is formed between the connecting pipe 17 and the inner channel of the workpiece, and the pressure value in the closed area is measured by a digital pressure gauge. The connecting pipe 17 also communicates with an accumulator 11, the accumulator 11 being located on the side of the control valve 18 close to the holder 21. The energy accumulator 11 can effectively absorb pressure fluctuation caused by temperature change, incomplete exhaust and the like, and reduce the influence of external factors on test results.

The pressurizing device can be a gas source such as a gas pump, a gas storage tank and the like, and is pressurized by gas; the hydraulic pump may be a hydraulic pump that pressurizes the fluid. In actual use, one end of the control valve 18 far away from the clamping seat 21 is communicated with a pressurizing device, the control valve 18 is opened, the pressure device pressurizes the inner channel of the workpiece to enable the pressure value to reach a certain value P, and at the moment, the control valve is closed. And then the driving part 33 starts a fatigue test on the workpiece, when the digital pressure gauge detects that the pressure inside the workpiece is lower than or equal to a critical value Pmin, the workpiece is indicated to have air leakage or liquid leakage, the driving part 33 stops working and records the rotation times of the driving part 33 driving the rotating part 32, and the obtained rotation times are the times of the workpiece fatigue test reaching damage.

Regarding the counting of the number of rotations, a counting disc is coaxially fixed on the rotating seat 321, a light through hole is axially formed on the counting disc, a photoelectric sensor is fixed on the base 1, an emitting end and a receiving end of the photoelectric sensor are respectively located at two axial ends of the counting disc, and a counter is coupled to the receiving end of the photoelectric sensor. In the process that the counting disc rotates for a circle, when the light through hole is positioned between the transmitting end and the receiving end, the receiving end of the photoelectric sensor receives a signal sent by the transmitting end once, and the receiving end sends a signal to the counter to enable the value of the counter to be +1, so that the counting of the rotating times is realized.

As shown in fig. 1, the positioning assembly 4 includes a positioning rod 41, a first chuck 42 and a second chuck 43, wherein the first chuck 42 and the second chuck 43 are both three-jaw chucks, and the first chuck 42 and the second chuck 43 are disposed opposite to each other at a clamping position of the workpiece. The first chuck 42 is fixed on the sliding seat 5, the second chuck 43 is fixed on the base 1, and the position of the second chuck 43 corresponds to the position of the clamping assembly 2.

The positioning rod 41 may be a steel rod, and one end of the positioning rod 41 is clamped by the first chuck 42 and the other end is clamped by the second chuck 43, so that the first chuck 42 and the second chuck 43 clamp and fix the connecting block 221 and the connecting head 34 in a one-to-one correspondence manner. The positioning assembly 4 can further limit the distance between the clamping seat 21 and the mounting seat 31, so that the distance between the clamping seat 21 and the mounting seat 31 is not easy to change in the fatigue test process of the workpiece, and the phenomenon that the test condition is changed due to the fact that the extra axial stress is added to the test pipe fitting due to the fact that the clamping seat 21 moves in the axial displacement mode, and the test result is inaccurate is reduced.

The positioning bar 41 may also employ a workpiece to be inspected. The workpiece can be directly a pipe fitting, and in actual use, as shown in fig. 6, another workpiece includes a pipe body 201 in a circular tube shape, two connecting sections 202 respectively located at two axial ends of the pipe body 201, and a threaded sleeve 203 slidably connected to the pipe body 201 and in threaded connection with the connecting sections 202. The axial both ends of body 201 are equipped with spacing ring 205, and spacing ring 205 is located the lateral wall of body 201, and spacing ring 205 is used for restricting threaded sleeve 203 and deviate from body 201. An elastic sealing ring 204 is further arranged between the threaded sleeve 203 and the limiting ring 205, the elastic sealing ring 204 is made of rubber, and the elastic sealing ring 204 is sleeved on the pipe body 201 and is connected to the pipe body 201 in a sliding manner along the axial direction of the pipe body 201.

In practical use, the connecting sections 202 at the two ends of the workpiece are clamped by the first chuck 42 and the second chuck 43 in a one-to-one correspondence manner, and at this time, the two axial ends of the pipe body 201 are abutted against the connecting sections 202 at the two ends. The threaded sleeve 203 may then be turned by a tool such as a torque wrench so that the threaded sleeve 203 compresses the resilient seal ring 204 so that the resilient seal ring 204 deforms. The torque wrench can control the tightening force, and after the thread sleeves 203 at the two ends of the workpiece are tightened, the situation that the test precision is affected due to the fact that the connecting sections 202 at the two ends of the workpiece are loosened in the test process can be reduced. When the workpiece requires a bending test, one of the connecting sections 202 at both ends of the workpiece is screwed to the connecting block 221 and the other is screwed to the connecting head 34. For convenience of screwing, two parallel clamping surfaces can be arranged on the outer side walls of the connecting block 221 and the connecting head 34, so that the connecting block 221 and the connecting head 34 can be screwed on a workpiece conveniently.

The working principle of the embodiment is as follows:

when a bending fatigue test needs to be performed on a workpiece, the connecting block 221 and the connector 34 are correspondingly screwed on the workpiece, one end of the workpiece, which is connected with the connecting block 221, is positioned through the pressing block 222, and the pressing block 222 is screwed and fixed after the axis of the workpiece is adjusted by the detection piece 19; then the fixing part 323 is unscrewed to enable the adjusting seat 322 to move to the position where the workpieces are coaxial, then the adjusting part 6 drives the sliding seat 5 to move to enable the clamping seat 21 to move, and then one end of the workpiece connecting head 34 correspondingly extends into the rotating groove 8 to be matched with the bearing in the rotating groove 8. After the workpiece is installed, a radial force is applied to the workpiece to enable the adjusting seat 322 to deviate by a required distance along the sliding direction of the workpiece so as to achieve bending of the workpiece, then the fixing piece 323 is screwed to fix the position of the adjusting seat 322, and at this time, the workpiece is installed completely. Then the positioning rod 41 is correspondingly clamped between the first chuck 42 and the second chuck 43 for further positioning, the control valve 18 is opened, the pressure is applied through the pressure applying device, the control valve 18 is closed after the pressure is applied to the specified pressure P, and finally the rotating part 32 is driven by the driving part 33 to rotate to perform the bending test on the workpiece.

Example two:

the difference from the first embodiment is the structure of the clamping member 22 and the bending member 3. In this embodiment, the holding member 22 is an air chuck or a hydraulic chuck, and holds and fixes one axial end of the workpiece.

The bending assembly 3 is configured as shown in fig. 7, and includes a mounting seat 31, a rotating member 32, and a driving member 33, the mounting seat 31 is fixed on the base 1, the rotating member 32 is rotatably connected to the mounting seat 31, and a rotation axis of the rotating member 32 is parallel to an axis of the workpiece clamped by the clamping assembly 2. The driving member 33 is a driving motor, and an output shaft of the driving member 33 is connected to the rotating shaft of the rotating member 32 to drive the rotating member 32 to rotate. One side of the rotating member 32 close to the clamping assembly 2 is provided with an interference surface 9, and the interference surface 9 may be an inner wall of a circular groove 15 formed in the rotating member 32, at this time, an axis of the circular groove 15 is parallel to and does not coincide with an axis of the rotating member 32.

During the in-service use, the work piece is fixed by the centre gripping of centre gripping subassembly 2 centre gripping, and the work piece is kept away from the one end of centre gripping subassembly 2 and is directly stretched into in circular slot 15 and can rotate for circular slot 15, and when driving piece 33 drove and rotates piece 32 and rotate, thereby it realizes crooked to rotate the circular slot 15 removal of piece 32 and drive the work piece and keep away from the one end of centre gripping subassembly 2 and take place radial skew.

Alternatively, as shown in fig. 8, the contact surface 9 may also be a side wall of the protrusion 16 on the rotating member 32 close to the rotation axis of the rotating member 32, and a distance from the side wall of the protrusion 16 close to the rotation axis of the rotating member 32 is smaller than a radius of a corresponding end of the workpiece, so that the contact surface of the protrusion 16 contacts with a circumferential outer wall of the workpiece during the rotation of the rotating member 32 to shift the corresponding end of the workpiece to radially shift to realize the reciprocating bending.

In this embodiment, the positioning rod 41 of the positioning assembly 4 may be a steel rod, so as to achieve positioning.

The embodiment of the application also discloses a pipe fatigue test device. As shown in fig. 9, on the basis of any one of the above-mentioned conduit bending fatigue test apparatuses, the apparatus further includes a housing 12, the housing 12 covers the upper end of the base 1, an opening 13 is formed in the housing 12, the housing 12 is further connected with a cover 14 in a sliding manner, the cover 14 is arranged in a transparent manner, and the cover 14 is provided with two directions in which sliding directions are relatively close to or away from each other. When a workpiece needs to be operated to clamp the workpiece, the two housings 14 slide away from each other to open the opening 13, and the workpiece can be loaded and unloaded through the opening 13; when the workpiece is in the test process, the two housings 14 move closer to each other and cover the opening 13, and isolation is achieved.

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 (10)

1. The utility model provides a pipe bending fatigue test device which characterized in that: the device comprises a base (1), wherein a clamping component (2) and a bending component (3) are arranged on the base (1);

the clamping assembly (2) comprises a clamping seat (21) arranged on the base (1) and a clamping piece (22) arranged on the clamping seat (21);

the bending assembly (3) comprises a mounting seat (31) arranged on the base (1), a rotating part (32) rotatably connected to the mounting seat (31), and a driving part (33) connected with the rotating part (32) and driving the rotating part (32) to rotate;

wherein, the one side that rotates piece (32) and be close to holder (22) is equipped with conflict face (9), conflict face (9) set up to be fixed after work piece one end by holder (22), rotate piece (32) and rotate the in-process and make the work piece reciprocal bending.

2. The catheter bending fatigue testing device of claim 1, wherein: the clamping piece (22) comprises a connecting block (221) in threaded connection with one axial end of the workpiece, and a pressing block (222) which is arranged on the mounting seat (31) and used for fixing the connecting block (221).

3. The catheter bending fatigue testing apparatus of claim 2, wherein: the connecting block (221) comprises a block body (2211) which is in threaded connection with one axial end of the workpiece and a pressing plate (2212) which is fixed on the outer side wall of the block body (2211);

the pressing block (222) comprises a first pressing portion (2221) and a second pressing portion (2222) which are arranged on the clamping base (21), the first pressing portion (2221) and/or the second pressing portion (2222) are/is fixed to the clamping base (21) through bolts, and the first pressing portion (2221) and the second pressing portion (2222) are matched to press the end face, far away from the clamping base (21), of the pressing plate (2212) so that the connecting block (221) is fixed to the clamping base (21).

4. The catheter bending fatigue testing apparatus of claim 2, wherein: crooked subassembly (3) still include connector (34), connector (34) are used for threaded connection in the one end that holder (22) were kept away from to the work piece, the one end that rotates piece (32) and be close to holder (22) is equipped with rotates groove (8), it supplies connector (34) to stretch into to rotate groove (8), just connector (34) rotate to be connected in rotating groove (8), the axis of rotation of connector (34) with the axis of rotation that rotates piece (32) does not coincide and sets up, conflict face (9) do rotate the inside wall in groove (8).

5. The catheter bending fatigue testing apparatus of claim 4, wherein: the connecting head (34) is used for plugging the end part corresponding to the workpiece; the connecting block (221) is provided with a through hole (10) used for being communicated with the inside of a workpiece, and the through hole (10) is used for being communicated with a pressurizing device.

6. The catheter bending fatigue testing apparatus of claim 4, wherein: rotate piece (32) including rotate connect rotation seat (321) on mount pad (31), slide and connect regulation seat (322) on rotating seat (321) and set up and be used for adjusting fixed mounting (323) of seat (322) rigidity on adjusting seat (322), the direction of sliding perpendicular to of adjusting seat (322) rotates the axis of rotation setting of seat (321), just rotate groove (8) and set up in adjust on seat (322).

7. The catheter bending fatigue testing apparatus of any one of claims 1-6, wherein: the clamping assembly (2) and the bending assembly (3) can move in the direction of being close to or far away from each other, an adjusting piece (6) is further arranged on the base (1), and the adjusting piece (6) is used for adjusting the distance between the clamping seat (21) and the mounting seat (31).

8. The catheter bending fatigue testing apparatus of claim 7, wherein: the base (1) is connected with a sliding seat (5) in a sliding manner, and the clamping seat (21) is fixed on the sliding seat (5) and arranged on the base (1) through the sliding seat (5);

the adjusting piece (6) is an adjusting screw rod which is rotatably connected to the base (1) and is in threaded connection with the sliding seat (5).

9. The catheter bending fatigue testing apparatus of claim 8, wherein: the base (1) is also provided with a positioning assembly (4), and the positioning assembly (4) comprises a positioning rod piece (41), a first chuck (42) arranged on the sliding seat (5) and a second chuck (43) arranged on the base (1); the positioning rod (41) is arranged to be clamped at one end by a first chuck (42) and at the other end by a second chuck (43) when the workpiece is clamped by the clamping assembly (2) and bent by the bending assembly (3).

10. A pipe fatigue test equipment which characterized in that: comprising the catheter bending fatigue test apparatus of any of claims 1-9;

the workpiece loading and unloading device is characterized by further comprising a shell (12), an opening (13) for a workpiece to pass through during loading and unloading is formed in the shell (12), and a cover shell (14) used for covering the opening (13) is connected to the shell (12) in a sliding mode.

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