CN210166245U

CN210166245U - Creep compression experimental apparatus

Info

Publication number: CN210166245U
Application number: CN201920408584.4U
Authority: CN
Inventors: 湛利华; 郑启朋; 汪凯; 黄明辉
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-03-20
Anticipated expiration: 2029-03-28

Abstract

The utility model provides a creep compression experimental apparatus, including being used for connecting the mounting bracket between two tensile poles about the creep testing machine, the mounting bracket includes briquetting and briquetting down, goes up to be provided with screw hole A on the briquetting, is provided with the taper hole coaxial with screw hole A on the briquetting down, and sample one end is fixed in screw hole A, and the conical head location that the other end passes through the toper locator is in the taper hole, and when conical head and taper hole matched, screw hole A, conical head, taper hole and sample are all coaxial. The utility model discloses a circular conical surface contact of toper locator realizes from line location function, can make the sample keep good centering nature in unipolar compression process, has reduced the possibility of sample unstability inflection. The utility model discloses still through the extension pole of reverse arrangement to the resilience displacement volume that the sensor measuring head of precompression took place at the in-process that resets is as the compression creep deformation volume of sample, the effectual emergence of avoiding the sensor measuring head overtravel, damaging this condition of displacement sensor.

Description

Creep compression experimental apparatus

Technical Field

The utility model relates to a creep test equipment, especially a creep compression experimental apparatus.

Background

With the rapid development of the aviation industry, the requirements on the performance of airplanes are continuously improved, the original deformation processing technology (roll bending, stretch forming and the like) can not meet the manufacturing requirements of complex wall plates (high ribs and skin integration), and the creep age forming technology is generated at the same time. The creep age forming technology has the problem of tension-compression asymmetry in member forming, and in order to ensure member forming precision, good strength, high corrosion resistance and the like, the creep tension-compression performance of a sample which is made of the same material as the member needs to be researched.

To develop the creep compression test, the following protocol has been used:

the utility model patent CN 206990327U of granting provides one-way tensile creep test machine compression anchor clamps, this scheme utilizes current one-way tensile creep test machine to realize material compression creep performance test, this method is fit for the thickness, the creep performance test of the sample that the footpath height ratio is big, it is nevertheless long and thin, the uneven sample test of terminal surface has great limitation, the utility model discloses require high to sample machining precision, must guarantee the depth of parallelism at sample both ends, the power is applyed on the pressure head, it is relatively poor with sample axis overlap ratio, the test accuracy who approximately represents creep variable through the pressure head displacement is not high. The utility model patent CN 204422329U that authorizes discloses a compression anchor clamps on mechanical type tensile creep testing machine, and this utility model can accomplish the compression creep test on existing mechanical type tensile creep endurance testing machine, and sample one end and adjustment bulb contact, the bulb plane is not level when sample both ends depth of parallelism is not high, and power and axis are not level, and the sphere contact does not restrict rotatoryly, and the sample is flexible among the compression test. The utility model discloses a test compression creep age's anchor clamps is related to in the patent CN 207147874U of authorization on the omnipotent experiment machine of electron, sample itself need not the centre gripping when this anchor clamps are carried out the experiment, only need put into press from both sides sample department can, it is simple and convenient to use, but this anchor clamps are only applicable to linear sample, the bar-like sample centre gripping precision that has the external screw thread to both ends is not enough, the breakable screw thread, it is influential to the follow-up experiment of carrying out, and this anchor clamps structure is more complicated, experiment operation space is less, the installation sample is difficult and distribute to the temperature field has more obvious influence, be unfavorable for developing the creep experiment in. The utility model discloses a high temperature compression anchor clamps is disclosed in the utility model patent CN 107063851A that authorizes, this patent provides one kind and is used for under the high temperature environment, test material compression performance index's test fixture, upper and lower compression body through cross connection, convert the pulling force into pressure, realized carrying out the compression performance test with tensile mode, nevertheless this anchor clamps sample both ends are not fixed, easily produce and slide and lead to the sample to buckle, and need dismantle whole anchor clamps when developing the experiment, the actual operation is inconvenient, and frequently dismantle and will produce great influence to anchor clamps itself, and the service life is shortened. The utility model discloses an authorization utility model patent CN 203798673U provides one kind and is used for under the high temperature environment, test material compression performance index's test fixture, this anchor clamps utilize the relative motion principle to have realized turning into the tensile properties test of material the method of compression performance test, it extrudees the compression that realizes the sample together to drive the briquetting through the pull rod, this anchor clamps can't realize the centering when carrying out the experiment of long and thin form bar-like appearance, the sample both ends do not have clamping device, the displacement of unable accurate measurement creep experiment, and it is difficult that anchor clamps cavity and through-hole processing when the sample is longer, and is with high costs, the precision is difficult to guarantee, creep experimental result to displacement required height influences very greatly.

The utility model patent CN 104374646A who authorizes discloses a mechanical type creep extensometer, provides a new extensometer, can the bar sample of different diameters of clamping and different gauge length, and this utility model is the commonality good when carrying out creep tensile test, and measurement accuracy is high, but when carrying out the compression experiment, the compression volume of sample changes the compression volume of sensor gauge head into, and after sample unstability inflection, the compression volume can increase rapidly, surpasss the measuring head stroke, causes the damage of high-accuracy displacement sensor. Authorized utility model CN 201016904Y discloses a metal room temperature creep test frock, can measure the elongation of creep sample, and the working process is stable, and is small, but this frock need be in under the same environment with the sample, only is applicable to under the room temperature condition, can't develop the high temperature creep test, and when the sample unstability destroyed, accurate displacement sensor can be impaired. Authorized utility model CN 207703621U relates to a quick clamping drawing device for creep test, through simple operation, can satisfy experimental assembly requirement, has improved clamping speed, but when carrying out the compression experiment, because high-accuracy displacement sensor is located the sample both sides, the crooked sensor overstroke that can lead to of sample unstability, and then leads to high-accuracy displacement sensor's damage.

In summary, there is a need in the art for a solution to solve the instability and bending problems that occur during the creep compression experiment due to misalignment between the sample stress and the axis, and the damage to the measuring head of the displacement sensor due to the over-travel after the instability and bending occur.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a creep compression experimental apparatus to solve the problem that proposes in the background art.

A creep compression experiment device comprises a mounting frame connected between an upper stretching rod and a lower stretching rod (namely the upper stretching rod and the lower stretching rod) of a creep testing machine, wherein the mounting frame comprises an upper pressing block and a lower pressing block, a distance for mounting a sample is kept between the upper pressing block and the lower pressing block along the stretching direction of the creep testing machine, the distance value can be adjusted under the driving of the creep testing machine, the distance can be reduced and used for providing creep compression loading operation for the sample, and the distance can be increased and used for dismounting the sample; the creep compression experimental device comprises an upper pressing block or a lower pressing block, wherein the upper pressing block or the lower pressing block is provided with a threaded hole A which can be matched with an external thread at one tail end of a sample in a screwing mode, correspondingly, the lower pressing block or the upper pressing block is provided with a taper hole which is coaxial with the threaded hole A, the creep compression experimental device also comprises a conical positioner which is used for being installed at the other tail end of the sample, one end of the conical positioner which is used for connecting the sample is provided with a threaded hole B which can be matched with the external thread at the other tail end of the sample in a screwing mode, the other end of the conical positioner is convexly provided with a conical head which can be matched with the taper hole, the threaded hole B is coaxial with the conical head, when the conical head is matched with the taper hole, the threaded hole A, the threaded hole B, the conical head and the taper hole are all coaxial, the axial lead of the threaded hole A is parallel to or, the other end of the test sample is finally coaxial with the threaded hole A, the threaded hole B, the conical head and the conical hole under the guiding action of the conical hole on the conical head, and then when the test sample enters a creep compression loading process, the axis line of the test sample is always parallel to or coincided with the stress direction, so that the test sample is prevented from being bent unstably.

Preferably, the threaded hole a is arranged on the upper pressing block, the taper hole is arranged on the lower pressing block, the threaded hole a is used for positioning the upper tail end of the sample, and the conical positioner and the taper hole are used for positioning the lower tail end of the sample.

Further, creep compression experimental apparatus still includes the extension device, the extension device includes displacement sensor, goes up the extension pole group and extends the pole group down, goes up the one end and the sample upper portion fixed connection that extend the pole group, goes up the other end and the displacement sensor main part fixed connection that extend the pole group, and the one end and the sample lower part fixed connection that extend the pole group down, the measuring head of displacement sensor is pushed down to the other end that extends the pole group down, and before the sample takes place compression deformation, the state of measuring head is the precompression state, takes place compression deformation gradually along with the sample, and the extension pole group shifts up gradually down, and makes measuring head precompression volume reduce gradually, resets even.

Furthermore, the upper position of the sample is provided with an upper lug, the lower position of the sample is provided with a lower lug, the extension device further comprises an upper lantern ring and a lower lantern ring, the upper extension rod group and the lower extension rod group respectively comprise two upper extension rods which are symmetrically arranged and two lower extension rods which are symmetrically arranged, the two upper extension rods are hooped and fixed at the lug on the sample through the upper lantern ring, and the two lower extension rods are hooped and fixed at the lug under the sample through the lower lantern ring.

The mounting frame comprises an upper guide rod, a lower guide rod, an upper connector and an upper connecting block which are positioned above an upper pressing block, and a lower connector and a lower connecting block which are positioned below a lower pressing block, wherein the upper guide rod and the lower guide rod are arranged in parallel, the axial directions of the upper guide rod and the lower guide rod are parallel to the axial directions of a threaded hole A and a threaded hole B, the upper end of the upper connector is used for connecting an upper stretching rod of a creep testing machine, the lower end of the upper connector is fixedly connected with the upper connecting block, the lower end of the lower connector is used for connecting a lower stretching rod of the creep testing machine, the upper end of the lower connector is fixedly connected with the lower connecting block, the upper guide rod is arranged in a guide hole arranged on the upper pressing block in a penetrating manner, the upper end of the upper guide rod is fixedly connected with the upper connecting block, the lower end of the upper guide rod is fixedly connected with the lower pressing block, the lower, the lower end of the lower guide rod is fixedly connected with the lower connecting block.

Furthermore, shaft shoulders are arranged at the upper end and the lower end of the upper guide rod and the upper end and the lower end of the lower guide rod.

Go up the guide bar upper end shoulder and offset with last connecting block to the tip of upper end shoulder as the border upwards stretches out the via hole that sets up on the last connecting block and is connected with stop part, goes up the guide bar lower extreme shoulder and offsets with lower briquetting, and the tip of using the lower extreme shoulder as the border downwards stretches out the via hole that sets up on the briquetting and is connected with stop part.

The upper end shaft shoulder of the lower guide rod is abutted against the upper pressing block, the thin end taking the upper end shaft shoulder as a boundary upwards extends out of the through hole formed in the upper pressing block and is connected with the limiting component, the lower end shaft shoulder of the lower guide rod is abutted against the lower connecting block, and the thin end taking the lower end shaft shoulder as a boundary downwards extends out of the through hole formed in the lower connecting block and is connected with the limiting component.

Furthermore, the limiting component is a limiting nut which is connected with the external threads at the tail ends of the upper guide rod and the lower guide rod in a screwing mode.

Furthermore, the upper guide rods and the lower guide rods are arranged in parallel, the two upper guide rods and the two lower guide rods are distributed in a rectangular array, the two upper guide rods are located at one diagonal position, and the two lower guide rods are located at the other diagonal position.

The utility model discloses following beneficial effect has at least:

the utility model provides a creep deformation compression experimental apparatus can make the sample keep good centering nature in unipolar compression process, reduce the risk of sample unstability and sensor damage, through conical surface contact realization self-align function that passes through of toper locator, guarantee that sample axis and sample atress direction coincidence have improved the sample atress condition, the possibility that the sample atress becomes curved has been reduced, the feasibility of compression experiment has been improved, the rejection rate and experimental cost have been reduced, it is not impaired in order to develop follow-up experiment to have ensured the sample. The utility model discloses still through the pole that stretches of reverse arrangement to the resilience displacement volume that the sensor measuring head of precompression took place at the in-process that resets is as the compression creep deformation volume of sample, even if the sample takes place the unstability crooked, the sensor measuring head can be replied to initial position after and the pole that stretches breaks away from the contact, the effectual emergence of having avoided the sensor measuring head overtravel, damaging this condition of displacement sensor.

The utility model discloses can improve the reliability of creep compression experimental data, the risk that can greatly reduced sample unstability crooked possibility and sensor damage, anchor clamps and drawing device loading and unloading are simple, and actual operation is unanimous basically with tensile experiment operation process, and the operation is got up simply conveniently.

Use the utility model provides a creep deformation compression experimental apparatus only need when carrying out sample loading and unloading with two ends of sample in screw hole A and screw hole B respectively can, need not artifical location, only need let the conical head roughly aim at the taper hole can, the conical head can fix a position the sample automatically under the guide of taper hole, simple and convenient, and can guarantee that repeated assembly precision is unchangeable many times, and the sample can not unstability be crooked, has good stability.

The utility model discloses four well guide bars (two are promptly guide bar and two lower guide bars) are rectangle diagonal line formula and arrange, and whole mounting bracket structure is more stable, and it is more even to pass power, and further the possibility that the unstability is crooked has taken place for the sample that has reduced.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

FIG. 1 is a schematic structural diagram of a mounting frame of a creep compression experiment apparatus according to a preferred embodiment of the present invention;

FIG. 2 is a schematic structural view of a mounting frame of the creep compression experiment device of the preferred embodiment of the present invention, which is provided with an extension device;

fig. 3 is a schematic view (cross sectional view) of the rectangular arrangement of the upper and lower guide bars according to the preferred embodiment of the present invention;

in the figure: 1-upper pressing block, 11-threaded holes A, 12-upper guide rod, 13-upper connecting head, 14-upper connecting block, 2-lower pressing block, 21-taper hole, 22-lower guide rod, 23-lower connecting head, 24-lower connecting block, 3-sample, 4-conical positioner, 41-threaded hole B, 42-taper head, 5-displacement sensor, 51-displacement sensor body, 52-measuring head, 6-upper extension rod group, 60-upper extension rod, 61-upper lantern ring, 7-lower extension rod group, 70-lower extension rod, 71-lower lantern ring and 8-limiting nut.

Detailed Description

The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.

The creep compression experiment device shown in fig. 1 to 3 comprises a mounting frame connected between an upper stretching rod and a lower stretching rod (not shown in the figure) of a creep testing machine and a lower stretching rod, wherein the mounting frame comprises an upper pressing block 1 and a lower pressing block 2, a distance for mounting a sample 3 is kept between the upper pressing block and the lower pressing block along the stretching direction of the creep testing machine, the distance value can be adjusted under the driving of the lower stretching rod of the creep testing machine, the distance can be reduced and used for providing a creep compression loading operation for the sample, and the distance can be increased and used for dismounting the sample; referring to fig. 1 and 2, the upper pressing block is provided with a threaded hole a11 (in this embodiment, the threaded hole a is a through hole) that can be screwed and matched with the external thread at the upper end of the sample, correspondingly, the lower pressing block is provided with a taper hole 21 that is coaxial with the threaded hole a, the creep compression experimental apparatus further comprises a conical positioner 4 that is used for being installed at the lower end of the sample, one end of the conical positioner that is used for connecting the sample is provided with a threaded hole B41 that can be screwed and matched with the external thread at the lower end of the sample, the other end of the conical positioner is convexly provided with a conical head 42 that can be matched with the taper hole, the threaded hole B is coaxial with the conical head, so that when the conical head is matched with the taper hole, the threaded hole a, the threaded hole B, the conical head and the taper hole are all coaxial, the axial lead of the threaded hole a coincides with the axial lead of the tensile rod, the upper tail end of a sample provided with the conical positioner is positioned in the threaded hole A, the lower tail end of the sample is finally coaxial with the threaded hole A, the threaded hole B, the conical head and the conical hole under the guiding action of the conical hole on the conical head, and then when the sample enters a creep compression loading process, the axial lead of the sample is always kept parallel or coincident with the stress direction, so that the sample is prevented from being bent unstably.

The utility model discloses there is following consideration at the creep in-process: force and axis are misaligned before the experiment is carried out to the sample, and its misalignment degree will further grow after the loading for the sample is crooked, leads to experimental data inaccurate, and fragile displacement sensor, can't carry out follow-up experiment. The utility model provides an in the scheme, the sample directly links to each other with anchor clamps, power passes through threaded connection direct action sample, can effectively avoid the effect direction of power and the skew of sample axis in transmission process, and the direction of cone contact can guarantee the direction and the coincidence of sample axis direction, the possibility that the direction skew arouses the sample to become curved because of the direction of power has been reduced, the toper part has from the positioning function, good to neutrality, can guarantee higher axiality, through the cooperation of toper locator and taper hole, before guaranteeing the experiment and in the loading process power and the coincidence of sample axis, will reduce the crooked possibility of sample, the accuracy and the reliability of improvement experimental data. And the actual operation is simple, the operation is basically consistent with that of a tensile experiment, and on the basis of not changing the original functions of the creep machine, the tensile creep is transformed into multifunctional equipment capable of realizing tension-compression creep through the mounting frame. The mounting frame and the extension device can be operated independently after being simply assembled and disassembled.

Referring to fig. 2, the creep compression experimental apparatus further includes an extension device, the extension device includes a displacement sensor 5, an upper extension rod set 6 and a lower extension rod set 7, one end of the upper extension rod set is fixedly connected with the upper portion of the sample, the other end of the upper extension rod set is fixedly connected with a displacement sensor main body 51, one end of the lower extension rod set is fixedly connected with the lower portion of the sample, the other end of the lower extension rod set presses a measuring head 52 of the displacement sensor, and before the sample is compressed and deformed, the measuring head is in a pre-compression state, as the sample is gradually compressed and deformed, the upper extension rod set gradually moves down (drives the displacement sensor main body 51 to move down), the lower extension rod set gradually moves up (drives the measuring head 52 to rebound upwards slowly), so that the pre-compression amount of the measuring head 52 is gradually reduced, even reset, even if the sample is unstably bent, the compression amount (i.e. the relative displacement amount of the upper and lower extension rod sets) of the sample exceeds the measuring range of, after the measuring head is reset, the lower extension rod group is separated from the measuring head and is not contacted any more, so that the displacement sensor cannot be damaged.

The existing creep testing machine is mainly arranged for a tensile test and is used for developing the low safety of a compression test, the motion direction of a measuring head of a displacement sensor is that the measuring head is more contracted towards the inside of a main body of the displacement sensor along with the larger compression amount of a sample, and when the test stress is larger, the instability and the bending of the sample are easy to cause the exceeding of the measuring range and damage the displacement sensor. Therefore the utility model discloses the innovation provides the above-mentioned scheme of reverse arrangement extension pole, will originally change the resilience of measuring head into to the compression of measuring head, the measuring head only can kick-back to normal initial position behind the sample unstability, can not damage the sensor, under the prerequisite that does not weaken the precision, has improved the reliability of mounting bracket.

In this embodiment, an upper lug is arranged at the upper position of the sample, a lower lug is arranged at the lower position of the sample, the extension device further includes an upper lantern ring 61 and a lower lantern ring 71, the upper extension rod set and the lower extension rod set respectively include two upper extension rods 60 which are symmetrically arranged and two lower extension rods 70 which are symmetrically arranged, the two upper extension rods are hooped and fixed at the upper lug of the sample through the upper lantern ring, and the two lower extension rods are hooped and fixed at the lower lug of the sample through the lower lantern ring.

Referring to fig. 1 and 2, the mounting frame comprises an upper guide rod 12, a lower guide rod 22, an upper connector 13 and an upper connecting block 14 which are positioned above an upper pressing block, and a lower connector 23 and a lower connecting block 24 which are positioned below a lower pressing block, the upper guide rod and the lower guide rod are arranged in parallel, the axial directions of the upper guide rod and the lower guide rod are parallel to the axial direction of a threaded hole a, the upper end of the upper connector is used for connecting an upper stretching rod of a creep testing machine, the lower end of the upper connector is fixedly connected with the upper connecting block, the lower end of the lower connector is used for connecting a lower stretching rod of the creep testing machine, the upper end of the lower connector is fixedly connected with the lower connecting block, the upper guide rod sequentially penetrates through guide holes formed in the upper connecting block, the upper pressing plate and the lower pressing plate from top to bottom, the upper guide rod penetrates through the guide hole formed in the upper, go up guide bar lower extreme and briquetting fixed connection down, the guide bar wears to establish in the guiding hole that sets up on the briquetting down, and lower guide bar upper end and last briquetting fixed connection, lower guide bar lower extreme and connecting block fixed connection down.

And the upper end and the lower end of the upper guide rod and the upper end and the lower end of the lower guide rod are respectively provided with a shaft shoulder (not shown in the figure).

Referring to fig. 1 and 2, the two exposed ends of the upper guide rod and the lower guide rod are both provided with external threads, and the limiting component is a limiting nut 8 screwed with the external threads at the ends of the upper guide rod and the lower guide rod.

Referring to fig. 1 and 2, in the present embodiment, the two upper guide rods and the two lower guide rods are arranged in parallel, and referring to fig. 3, in the present embodiment, the two upper guide rods and the two lower guide rods are distributed in a rectangular array, the two upper guide rods are located at one pair of opposite angles, and the two lower guide rods are located at the other pair of opposite angles.

It should be noted that, because the plate-shaped sample is bent stably when being compressed, the plate-shaped sample is not generally used for creep compression tests, and the sample in the utility model refers to a bar-shaped sample with external threads at two ends.

Use the utility model discloses a creep compression experimental apparatus carries out the concrete process of creep compression experiment and roughly as follows:

the upper connector and the lower connector are respectively connected with an upper stretching rod and a lower stretching rod of a creep testing machine, a lower stretching rod of the creep testing machine is adjusted to enlarge the distance between an upper pressing block and a lower pressing block (the distance is at least larger than the sum of the lengths of a sample and a conical positioner), the conical positioner is connected with the sample, the sample is screwed in a threaded hole A and is connected with the upper pressing block, the conical positioner is approximately aligned with a conical hole in the lower pressing block, and the sample is completely installed.

The upper extension rod group and the lower extension rod group are fixed on the upper lug and the lower lug of the sample by an upper sleeve ring and a lower sleeve ring respectively, the displacement sensor is well installed, and a creep compression experiment can be carried out after the position of the measuring head is adjusted (the measuring head can be pre-compressed to the lower limit position of the measuring head).

Refer to above-mentioned creep compression experimentation, under the unchangeable circumstances of sample strain guaranteeing, also can use the utility model discloses a creep compression experimental apparatus carries out the experiment of relaxing of stress.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The creep compression experimental device is characterized by comprising a mounting frame connected between two upper and lower stretching rods of the creep testing machine, wherein the mounting frame comprises an upper press block (1) and a lower press block (2), a distance for mounting a sample is kept between the upper press block and the lower press block along the stretching direction of the creep testing machine, a threaded hole A (11) matched with the external thread at one end of the sample in a screwing manner is arranged on the upper press block or the lower press block, correspondingly, a conical hole (21) coaxial with the threaded hole A is arranged on the lower press block or the upper press block, the creep compression experimental device further comprises a conical positioner (4) arranged at the other end of the sample, one end of the conical positioner, which is used for connecting the sample, is provided with a threaded hole B (41) matched with the external thread at the other end of the sample in a screwing manner, and the other end of the conical positioner is convexly provided with a conical head (42) matched with the, the threaded hole B is coaxial with the conical head, so that when the conical head is matched with the conical hole, the threaded hole A, the threaded hole B, the conical head and the conical hole are coaxial, and the axis of the threaded hole A is parallel to or coincided with the axis of the creep testing machine stretching rod.

2. The creep compression testing apparatus according to claim 1, wherein the threaded hole a is provided on the upper pressing block, the tapered hole is provided on the lower pressing block, the threaded hole a is used for positioning the upper end of the sample, and the tapered locator and the tapered hole are used for positioning the lower end of the sample.

3. The creep compression experimental device according to claim 1, wherein the mounting frame comprises an upper guide rod (12), a lower guide rod (22), an upper connector (13) and an upper connecting block (14) which are positioned above the upper pressing block, and a lower connector (23) and a lower connecting block (24) which are positioned below the lower pressing block, the upper guide rod and the lower guide rod are arranged in parallel, the axial directions of the upper guide rod and the lower guide rod are parallel to the axial directions of the threaded hole A and the threaded hole B, the upper end of the upper connector is used for connecting an upper stretching rod of the creep testing machine, the lower end of the upper connector is fixedly connected with the upper connecting block, the lower end of the lower connector is used for connecting a lower stretching rod of the creep testing machine, the upper end of the lower connector is fixedly connected with the lower connecting block, the upper guide rod is arranged in a guide hole arranged on the upper pressing block in a penetrating manner, and the upper end, go up guide bar lower extreme and briquetting fixed connection down, the guide bar wears to establish in the guiding hole that sets up on the briquetting down, and lower guide bar upper end and last briquetting fixed connection, lower guide bar lower extreme and connecting block fixed connection down.

4. The creep compression testing apparatus according to claim 3, wherein the upper and lower ends of the upper guide bar and the upper and lower ends of the lower guide bar are provided with shoulders;

the upper end shaft shoulder of the upper guide rod abuts against the upper connecting block, the thin end with the upper end shaft shoulder as a boundary upwards extends out of the through hole formed in the upper connecting block and is connected with the limiting component, the lower end shaft shoulder of the upper guide rod abuts against the lower pressing block, and the thin end with the lower end shaft shoulder as a boundary downwards extends out of the through hole formed in the upper pressing block and is connected with the limiting component;

5. The creep compression experiment device according to claim 4, wherein the limiting component is a limiting nut (8) screwed with the external threads at the ends of the upper guide rod and the lower guide rod.

6. The apparatus of claim 3, wherein the upper and lower guide rods are parallel, the upper and lower guide rods are arranged in a rectangular array, the upper guide rods are located at opposite corners of one pair, and the lower guide rods are located at opposite corners of the other pair.

7. The creep compression experimental device according to any one of claims 1 to 6, further comprising an extension device, wherein the extension device comprises a displacement sensor (5), an upper extension rod set (6) and a lower extension rod set (7), one end of the upper extension rod set is fixedly connected with the upper portion of the sample, the other end of the upper extension rod set is fixedly connected with a displacement sensor body (51), one end of the lower extension rod set is fixedly connected with the lower portion of the sample, the other end of the lower extension rod set presses a measuring head (52) of the displacement sensor, and before the sample is compressed and deformed, the measuring head is in a pre-compression state.

8. The creep compression testing apparatus according to claim 7, wherein the upper position of the test specimen is provided with an upper lug, the lower position of the test specimen is provided with a lower lug, the extension apparatus further comprises an upper collar (61) and a lower collar (71), the upper extension rod set and the lower extension rod set respectively comprise two upper extension rods symmetrically arranged and two lower extension rods symmetrically arranged, the two upper extension rods are fixed at the upper lug of the test specimen by the upper collar hoop, and the two lower extension rods are fixed at the lower lug of the test specimen by the lower collar hoop.