CN111551453A

CN111551453A - Material thermal extension testing device

Info

Publication number: CN111551453A
Application number: CN202010549241.7A
Authority: CN
Inventors: 吴雪梅; 李娜
Original assignee: Shanghai National Center Of Testing And Inspection For Electric Cable And Wire Co ltd
Current assignee: Shanghai National Center Of Testing And Inspection For Electric Cable And Wire Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2020-08-18

Abstract

The invention relates to the technical field of material detection, in particular to a material thermal extension testing device which comprises a testing box, a preparation box and a clamp, wherein the testing box is internally hollow to form a testing cavity, the preparation box is internally hollow to form a preparation cavity, the clamp is used for clamping a sample and suspending a load, the clamp is arranged in the preparation cavity in a lifting mode, the preparation box is arranged on the upper surface of the testing box, the preparation cavity is communicated with the testing cavity through a sample inlet through which the clamp can pass, and a sealing door for opening or closing the sample inlet is arranged at the sample inlet. In the process of putting a sample into the testing cavity, the testing cavity generates tiny gas convection with the preparation cavity only through the sample inlet and cannot generate convection with the ambient gas of the device, so that the temperature fluctuation of the testing cavity in the lofting process is very small, or only has tiny amplitude reduction, the testing temperature can be recovered in a short time by the temperature return and control capacity of the testing box, the recovery time of the testing temperature in the testing cavity is greatly shortened, and the testing result is more accurate.

Description

Material thermal extension testing device

Technical Field

The invention relates to the technical field of material detection, in particular to a material thermal extension testing device.

Background

The thermal extension performance is an important performance parameter reflecting the crosslinking degree of the insulation and sheath materials of the crosslinked cable, and the thermal extension result of the insulation and sheath materials of the cable is accurately measured, so that whether the crosslinking degree of the insulation and sheath materials of the measured cable meets the standard requirement can be judged, the adjustment and improvement of cable production process parameters can be facilitated, and the improvement of product quality is facilitated.

In the actual operation process of the existing testing device for detecting the thermal extension performance of the material, when a door of the oven is opened and a loaded sample is hung on a testing support, the gas convection is generated between the interior of the oven and the ambient environment of the testing device, the temperature in the oven can be obviously reduced, the temperature in the oven needs to be returned to the testing temperature in a short time, on one hand, the requirement on testing operators is extremely high, the operation speed of the testers is required, on the other hand, the requirement on the temperature return and temperature control capability of the oven is also high, the oven needs to be restored to the testing temperature in a short time, and most of the existing ovens can not meet the requirement. In the actual test process, if the test temperature recovery time is too long, or the time difference of the test temperature recovery of each laboratory is too large, on one hand, the accuracy and consistency of the test result cannot be considered, and on the other hand, the test time is increased, and the working efficiency is influenced.

Disclosure of Invention

The present invention provides a material thermal extension testing apparatus, which can shorten the recovery time of the testing temperature to overcome the above-mentioned defects in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a hot testing arrangement that extends of material, includes that inside cavity forms the test box in test chamber, inside cavity forms the preparation case of preparing the chamber and is used for centre gripping sample and suspended load's anchor clamps, and anchor clamps are located with liftable and prepare the intracavity, and the upper surface of test box is arranged in to the preparation case, and is linked together through the introduction port that can supply anchor clamps to pass through between preparation chamber and the test chamber, and introduction port department is equipped with the door that seals that opens or close the introduction port.

Preferably, the test device further comprises a test rod for hanging one or more clamps, and the test rod is arranged in the preparation cavity in a lifting mode and can enter the test cavity through the sample inlet.

Preferably, both ends of the testing rod are respectively supported on the supporting rod in a vertically sliding manner, the upper end of the supporting rod is positioned in the preparation cavity, and the lower end of the supporting rod penetrates through the sample inlet and extends into the testing cavity.

Preferably, a base frame is arranged in the test cavity, and the lower end of the support rod is arranged on the base frame.

Preferably, the test device further comprises a suspension rod, the suspension rod is rotatably arranged in the preparation cavity, and the test rod is suspended on the suspension rod through a suspension wire wound on the suspension rod.

Preferably, the device further comprises a rocker for driving the suspension rod to rotate, wherein one end of the rocker is connected with the suspension rod, and the other end of the rocker extends out of the preparation box.

Preferably, the preparation tank is provided with a clamp for fixing the rocking bar.

Preferably, the test cavity is internally provided with a supporting block for supporting the test rod, and the test rod is placed on the supporting block after entering the test cavity.

Preferably, the device further comprises a pull rod for driving the sealing door to move, one end of the pull rod is connected with the sealing door, and the other end of the pull rod extends out of the preparation box.

Preferably, a vertically placed scale is arranged in the test cavity.

Compared with the prior art, the invention has the remarkable progress that:

the material thermal extension testing device of the invention is provided with a preparation box above a testing box, a clamp, a sample clamped by the clamp and a suspended load are preset in a preparation cavity of the preparation box, a sample inlet is opened through a sealing door during lofting, the clamp is descended to lead the sample and the load to enter a testing cavity of the testing box through the sample inlet together, so as to realize lofting, therefore, in the process of putting the sample into the testing cavity of the testing box, the testing cavity only generates tiny gas convection with the preparation cavity through the sample inlet, but does not generate convection with the ambient gas around the device, the temperature fluctuation of the testing cavity is very small or only has tiny reduction, the testing temperature can be recovered to the testing temperature in a short time by the self temperature return and control capability of the testing box, the recovery time of the testing temperature in the testing cavity is greatly shortened, and the testing result can be more accurate, and the consistency of the test results is ensured, and meanwhile, the test time consumption can be reduced, the test period is shortened, and the working efficiency is improved.

Drawings

FIG. 1 is a perspective schematic view of a material thermal extension test apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic view of a material thermal extension testing apparatus according to an embodiment of the present invention with the door open.

Wherein the reference numerals are as follows:

1. test box 1a, test chamber 100 and test box door

101. Test observation window 102, control panel 2, preparation box

2a, preparation chamber 200, preparation chamber door 201, preparation observation window

3. Clamp 31, upper clamp 32 and lower clamp

4. Sample inlet 5, sample 6, load

7. Sealing door 8, pull rod 9 and test rod

10. Support rod 11, base frame 12 and suspension rod

13. Suspension wire 14, rocker 15, holder

16. Hanging nail 17, scale 18, scale support

19. Supporting block

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

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

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

One embodiment of the material thermal extension test apparatus of the present invention is shown in fig. 1 and 2.

Referring to fig. 1, the material thermal extension test apparatus of the present embodiment includes a test box 1, a preparation box 2, and a jig 3. The test box 1 is hollow inside to form a test cavity 1a, and the test cavity 1a is used for performing a test for testing the thermal extension performance of the material sample 5, namely the test box 1 is used as an oven for performing the test for testing the thermal extension performance of the sample 5. The preparation box 2 is hollow inside to form a preparation chamber 2a, the preparation box 2 is placed on the upper surface of the test box 1, and the preparation chamber 2a is communicated with the test chamber 1a through a sample inlet 4. The clamp 3 is used for clamping a sample 5 and suspending a load 6, the clamp 3 is arranged in the preparation cavity 2a in a lifting mode, the sample inlet 4 can be used for the clamp 3 to pass through, and the clamp 3 can drive the sample 5 and the load 6 to pass through the sample inlet 4 together when lifting, so that the position of the sample 5 between the preparation cavity 2a and the testing cavity 1a is changed. A sealing door 7 is arranged at the sample inlet 4, and the sealing door 7 opens or closes the sample inlet 4. When the sample inlet 4 is opened by the sealing door 7, the sample inlet 4 communicates the preparation cavity 2a with the test cavity 1a, and at the moment, the clamp in the preparation cavity 2a can descend together with the sample 5 and the load 6 through the sample inlet 4 and enter the test cavity 1a, so that the sample 5 is placed in the test cavity 1 a; after the lofting is finished, the sealing door 7 is used for closing the sample inlet 4, at the moment, the sealing door 7 separates the preparation cavity 2a from the test cavity 1a, so that the test cavity 1a is an independent closed cavity, and the test cavity 1a can be kept at the test temperature to perform a test for testing the thermal extension performance of the sample 5.

The material thermal extension testing device of the embodiment is characterized in that a preparation box 2 is arranged above a testing box 1, a clamp 3, a sample 5 clamped by the clamp and a suspended load 6 are preset in a preparation cavity 2a of the preparation box 2, a sealing door 7 is used for opening a sample inlet 4 during lofting, the clamp 3 is descended to enable the clamp and the sample 5 and the load 6 to enter a testing cavity 1a of the testing box 1 through the sample inlet 4 together, lofting is achieved, therefore, in the process of putting the sample 5 into the testing cavity 1a of the testing box 1, the testing cavity 1a only generates tiny gas convection with the preparation cavity 2a through the sample inlet 4 and does not generate convection with ambient gas around the device, temperature fluctuation of the testing cavity 1a in the lofting process is very small or only has tiny amplitude reduction, and the testing temperature can be recovered to the testing temperature in a short time by means of the temperature return and temperature control capability of the testing box 1, the recovery time of the test temperature in the test cavity 1a is greatly shortened, the test result is more accurate, the consistency of the test result is ensured, the test time consumption is reduced, the test period is shortened, and the working efficiency is improved.

In this embodiment, the test box 1 may be an oven satisfying different standards, such as a natural ventilation oven that is ventilated 8-20 times per hour and satisfies IEC standard and national standard, or a forced ventilation oven that is ventilated 100-200 times per hour and satisfies UL standard.

In this embodiment, preferably, the top wall of the testing chamber 1a of the testing box 1 is provided with a vertically through injection port 4, the lower end of the preparation chamber 2a of the preparation box 2 is open, the lower surface of the preparation chamber 2 is attached to the upper surface of the testing box 1, the preparation chamber 2a is located above the injection port 4, and the lower end of the preparation chamber 2a covers the injection port 4, so that the injection port 4 on the testing chamber 1a is only communicated with the preparation chamber 2a and is not communicated with the ambient space of the device.

Preferably, the material thermal extension testing device of the embodiment may further include a pull rod 8, where the pull rod 8 is used to drive the door 7 to move, so as to enable the door 7 to open or close the sample inlet 4. One end of the pull rod 8 is connected with the sealing door 7, and the other end of the pull rod 8 extends out of the preparation box 2 to be held by an operator for force application, so that the sealing door 7 is driven to move by pushing and pulling the pull rod 8. The way of moving the sealing door 7 to open or close the sample inlet 4 is not limited, and for example, the sealing door 7 can be moved horizontally or back and forth by pushing and pulling the pull rod 8 to move the sealing door 7 to the left or right, so as to open or close the sample inlet 4. Preferably, the pull rod 8 is made of a thin sheet, and the thin sheet pull rod 8 can be arranged to be close to the upper surface of the test box 1, thereby being beneficial to increase the sealing performance of the preparation chamber 2 a. Preferably, the sealing door 7 can be formed by two doors which are spliced with each other, each door is connected with one pull rod 8, the two doors are driven to simultaneously move in opposite directions by the simultaneous action of the two pull rods 8, and the time required by opening and closing the sample inlet 4 can be reduced.

Preferably, the material thermal extension testing device of the present embodiment may further include a testing rod 9, and the testing rod 9 is used for suspending one or more clamps 3 to support the clamps 3. The testing rod 9 is arranged in the preparation cavity 2a in a liftable mode, and the testing rod 9 can enter the testing cavity 1a through the sample inlet 4, so that the clamp 3 can be driven to ascend and descend along with the ascending and descending of the testing rod 9, and the position of the testing rod can be changed between the preparation cavity 2a and the testing cavity 1 a. Through the support of test bar 9, can realize setting up a plurality of anchor clamps 3 in preparing chamber 2a to drive a plurality of anchor clamps 3 synchronous lifting simultaneously, thereby realize once putting into a plurality of samples 5 in to test chamber 1 a. Preferably, one or more suspension pegs 16 may be provided on the test rod 9, each suspension peg 16 being operable to suspend one clamp 3.

In this embodiment, preferably, the testing rod 9 is horizontally disposed, two ends of the testing rod 9 are respectively supported on the supporting rod 10 in a vertically slidable manner, the supporting rod 10 is vertically disposed, an upper end of the supporting rod 10 is located in the preparation chamber 2a, and a lower end of the supporting rod 10 penetrates through the sample inlet 4 and extends into the testing chamber 1 a. The both ends of test bar 9 all slide from top to bottom along bracing piece 10 in the lift in-process, and bracing piece 10 plays the effect of supporting the bearing to test bar 9 and hang anchor clamps 3, sample 5 and load 6 on test bar 9, plays the guide effect to the lift of test bar 9 simultaneously, is favorable to the steady lift of test bar 9. Preferably, two bracing pieces 10 are respectively arranged at two opposite side surfaces of the sample inlet 4, and the diameter of the bracing piece 10 should be as small as possible on the premise of meeting the requirement of supporting strength, so that the bracing piece 10 does not influence the opening and closing of the sample inlet 4. Preferably, two opposite side surfaces of the two support rods 10 are respectively provided with a sliding groove, and two ends of the testing rod 9 are respectively inserted into the sliding grooves of the two support rods 10 and are in sliding fit with the sliding grooves.

In this embodiment, a base frame 11 is preferably disposed in the testing chamber 1a, and the lower ends of the two support rods 10 are mounted on the base frame 11. Base frame 11 can be fixed on the diapire of test chamber 1a, and the preferred fretwork frame that is preferred to base frame 11 can not influence the circulation of air in the test chamber 1a, and simultaneously, base frame 11 has certain weight, can provide stable support for bracing piece 10, also for locating the test bar 9 on the bracing piece 10 and hanging anchor clamps 3, sample 5 and the load 6 that hang on test bar 9 provide stable support.

Preferably, the material thermal extension testing device of the embodiment may further include a hanging rod 12, the hanging rod 12 is horizontally disposed, a hanging wire 13 is wound on the hanging rod 12, the testing rod 9 is hung on the hanging rod 12 through the hanging wire 13, that is, one end of the hanging wire 13 is fixed on the hanging rod 12, the other end of the hanging wire 13 is connected with the testing rod 9, and the hanging wire 13 is wound on the hanging rod 12. The hanging rod 12 is rotatably arranged in the preparation cavity 2a, and the hanging wire 13 wound on the hanging rod 12 can be wound and unwound through the rotation of the hanging rod 12, so that the testing rod 9 hung at the lower end of the hanging rod is driven to lift. Preferably, both ends of the hanging bar 12 may be rotatably supported at the upper ends of the two support bars 10, respectively, the two support bars 10 provide support for the hanging bar 12, and the hanging bar 12 and the hanging wire 13 provide support for the test bar 9 and the clamp 3, the sample 5 and the load 6 hung on the test bar 9. In order to increase the bearing capacity, preferably, the suspension wires 13 may be provided with a plurality of suspension wires 13, and the plurality of suspension wires 13 are uniformly distributed on the suspension rod 12 at intervals and are all vertically connected with the test rod 9. The suspension wire 13 can be made of high-temperature-resistant and high-strength materials, and meanwhile, on the premise of meeting the strength requirement, the diameter of the suspension wire 13 is required to be as small as possible, so that after the test rod 9, the clamp 3, the sample 5 and the load 6 enter the test cavity 1a, the closing of the sample inlet 4 cannot be influenced by the existence of the suspension wire 13.

Further, the material thermal extension testing device of the embodiment may further include a rocker 14, the rocker 14 is used for driving the suspension rod 12 to rotate, one end of the rocker 14 is connected with the suspension rod 12, and the other end of the rocker 14 extends out of the preparation box 2 for an operator to hold and apply force, and the rocker 14 is rotated to drive the suspension rod 12 to rotate therewith. The rotation of the rocker 14 can be effected either manually or by an electric drive.

In order to position the test rod 9 and the clamp 3, the sample 5 and the load 6 in the preparation chamber 2a or the test chamber 1a, the suspension rod 12 needs to be fixed after rotating for a certain angle, so that the test rod 9 stops lifting, therefore, in the present embodiment, preferably, a clamping piece 15 is arranged on the preparation box 2, and the clamping piece 15 is used for fixing the rocker 14. The clamping piece 15 can be detachably matched with the rocker 14 in a clamping mode, when the test rod 9 does not need to be lifted, the clamping piece 15 can be clamped with the rocker 14, the rocker 14 is fixed by the clamping piece 15, the suspension rod 12 is fixed, the suspension rod 12 cannot rotate at the moment, and the test rod 9 cannot be lifted; when the test rod 9 needs to be lifted, the clamping piece 15 can be separated from the rocker 14, so that the rocker 14 can rotate freely, the suspension rod 12 can be driven to rotate, and the lifting of the test rod 9 is realized.

In this embodiment, preferably, a ruler 17 is disposed in the testing chamber 1a, and the ruler 17 is vertically disposed. The scale 17 is used to measure the tensile length of the sample 5 in the hot-stretch property test. The scale 17 can be equipped with a plurality ofly, and the quantity of the hanging nail 16 that sets up on the quantity of scale 17 and the test bar 9 is the same, promptly with can carry out the experimental sample 5's of hot extension performance test quantity the same simultaneously, the setting position of scale 17 in test chamber 1a corresponds with the hanging nail 16 one-to-one on the test bar 9, corresponding scale 17 is located same vertical position with hanging nail 16 to make anchor clamps 3, sample 5 and the load 6 that hang on the hanging nail 16 descend to fall into test chamber 1a along with the test bar 9 and be located the place ahead of the scale 17 that corresponds with it after, so that observe the reading.

Further, can be equipped with scale support 18 in the test chamber 1a, scale support 18 is used for supporting scale 17, and the upper end of scale 17 can be connected with scale support 18, and scale 17 hangs perpendicularly on scale support 18. Preferably, the scale support 18 may be mounted on the base frame 11, and the two support rods 10 are arranged on the base frame 11 at positions in front of the scale support 18, so that the test rod 9 with the jigs 3, the sample 5 and the load 6 falls down the support rods 10 into the test chamber 1a and then in front of the scale 17, which facilitates the observation of the readings.

In this embodiment, it is preferable that a supporting block 19 is provided in the testing chamber 1a, the supporting block 19 is used for supporting the testing rod 9, the testing rod 9 is placed on the supporting block 19 after entering the testing chamber 1a, and the supporting block 19 is used for supporting and positioning the testing rod 9 in the testing chamber 1a, so as to support and position the clamp 3, the sample 5 and the load 6 hung on the testing rod 9 in the testing chamber 1 a. The length of the suspension wires 13 is sufficient to enable the test rod 9 to be lowered to the support block 19. When the test rod 9 is lowered to the support block 19, the sample 5 is positioned directly in front of the corresponding scale 17, which facilitates the observation of the reading. Preferably, the support block 19 may be provided on the scale support 18, and an upper surface of the support block 19 is located at the same level as a top surface of the scale 17. In order to increase the supporting strength, the supporting block 19 may be provided in plural, and the plural supporting blocks 19 are uniformly distributed at intervals on the scale support 18.

In this embodiment, the clamp 3 preferably includes an upper clamp 31 and a lower clamp 32, the upper clamp 31 can be freely removed from and installed on the hanging nail 16 on the test bar 9, the lower part of the lower clamp 32 can be used for hanging the load 6, and the load 6 can be a weight. The sample 5 is held between the upper and

lower clamps

31 and 32, and the upper and

lower clamps

31 and 32 provide a suitable holding force for the sample 5 without damaging the sample 5. The form of the clamp 3 is not limited, and for example, the clamp 3 may be a self-tightening spring clamp.

In the present embodiment, it is preferable that the area of the lower surface of the preparation tank 2 is not larger than the area of the upper surface of the test tank 1. In order to reduce the fluctuation of the temperature of the test chamber 1a during lofting as much as possible, the volume of the preparation chamber 2a of the preparation box 2 should be as small as possible to reduce the convection of gas between the test chamber 1a and the preparation chamber 2a as much as possible, while accommodating the two support rods 10, the suspension rod 12, the test rod 9, the jig 3, the sample 5, and the load 6. Preferably, the preparation box 2 may be made of a thermal insulation material, which is beneficial to maintain the temperature in the preparation chamber 2a, and further reduces the heat loss of the test chamber 1a due to the convection of the gas with the preparation chamber 2 a. Similarly, the size of the sample inlet 4 should be as small as possible to minimize the convection of gas between the test chamber 1a and the preparation chamber 2a, provided that the test rod 9, the clamp 3, and the sample 5 and load 6 can pass through. Preferably, the sealing door 7 at the injection port 4 can be made of a heat insulating material, for example, an asbestos plate, which has good heat insulating and preserving properties.

Referring to fig. 2, in the present embodiment, it is preferable that the front side of the test chamber 1 is provided with a test chamber door 100 for opening or closing the test chamber 1 a. In the test process, the test box door 100 is closed, and the test cavity 1a is closed; after the test is completed, the test chamber door 100 may be opened, so that the jig 3, and the sample 5 and the load 6 may be taken out of the test chamber 1 a. Preferably, the test box door 100 may be provided with a test observation window 101, and when the test box door 100 is closed, the test observation window 101 may be used to observe the internal condition of the test chamber 1a during the test.

Referring to fig. 2, in the present embodiment, it is preferable that the front side of the preparation box 2 is provided with a preparation box door 200 for opening or closing the preparation chamber 2 a. Before the test is started, the preparation chamber 2a may be closed by opening the preparation chamber door 200, hanging the jig 3 and the sample 5 and the load 6 on the hanging pins 16 of the test bar 9, and closing the preparation chamber door 200 after the placement is completed. Preferably, the preparation chamber door 200 may be provided with a preparation observation window 201, and when the preparation chamber door 200 is closed, the inner condition of the preparation chamber 2a may be observed through the preparation observation window 201.

In addition, referring to fig. 2, a control panel 102 may be further disposed on the testing box 1, and the control panel 102 is used for controlling and regulating the temperature in the testing chamber 1 a. The control panel 102 may be a control panel of an existing oven.

The operation steps of the material thermal extension testing device of the embodiment are as follows:

before the test, the suspension wire 13 is tightened, the testing rod 9 is positioned in the preparation cavity 2a, the rocker 14 is fixed by the clamping piece 15, the sample inlet 4 is closed by the sealing door 7, the testing box door 100 is closed, and the temperature of the testing cavity 1a is adjusted to the specified testing temperature through the control panel 102. The fixture 3, sample 5 and load 6 were assembled outside the apparatus: and clamping the sample 5 with the scale distance between an upper clamp 31 and a lower clamp 32, hanging a load 6 on the lower clamp 32, and enabling the sum of the mass of the lower clamp 32 and the mass of the load 6 to meet the standard requirement. After the temperature of the test chamber 1a is stabilized, the preparation chamber door 200 is opened, the assembled jig 3, sample 5 and load 6 are placed in the preparation chamber 2a, the upper jig 31 is hung on the hanging pins 16 on the test bar 9, and the preparation chamber door 200 is closed after the placement of the sample 5. Pulling the pull rod 8 to move the sealing door 7, enabling the sealing door 7 to open the sample inlet 4, separating the clamping piece 15 from the rocker 14, rotating the rocker 14, enabling the suspension rod 12 to rotate and loosening the suspension wire 13, lowering the test rod 9, enabling the test rod 9 to drive the clamp 3, the sample 5 and the load 6 to enter the test cavity 1a through the sample inlet 4, stopping rotating the rocker 14 and fixing the rocker 14 by using the clamping piece 15 when the test rod 9 descends to the supporting block 19, pushing the pull rod 8 to move the sealing door 7, and enabling the sealing door 7 to close the sample inlet 4. After the sample inlet 4 is closed, if the temperature of the test cavity 1a does not drop, timing can be started directly; if the temperature of the test chamber 1a is slightly decreased, the timer may be started after the temperature of the test chamber 1a is returned to the predetermined test temperature. After the test time is up, the tensile length under the load is rapidly read through the test observation window 101 and recorded, then the test box door 100 is opened, the lower clamp 32 and the load 6 are rapidly released (can be removed by scissors), then the test box door 100 is closed, in the process, the temperature of the test cavity 1a is reduced, after the temperature of the to-be-tested cavity 1a is recovered to the specified test temperature, the test box door 100 is opened, the sample 5 is taken out, and the permanent extension length after the load is released is read according to the specified method and recorded. After the sample 5 is taken out, the clamping piece 15 can be separated from the rocker 14, the rocker 14 is rotated reversely, the suspension rod 12 is rotated and the suspension wire 13 is tightened, the test rod 9 is lifted, the test rod 9 with the clamp 3, the sample 5 and the load 6 returns to the preparation cavity 2a through the sample inlet 4, the rocker 14 stops rotating after the test rod 9 is reset, and the rocker 14 is fixed by the clamping piece 15 for the next test.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a material hot extension testing arrangement, its characterized in that forms preparation case (2) of preparing chamber (2a) and be used for centre gripping sample (5) and anchor clamps (3) of hanging load (6) including test box (1), the inside cavity that inside cavity formed test chamber (1a), inside cavity, anchor clamps (3) are located with liftable prepare in chamber (2a), prepare case (2) and arrange in the upper surface of test box (1), just prepare chamber (2a) with through supplying between test chamber (1a) introduction port (4) that anchor clamps (3) pass through are linked together, introduction port (4) department is equipped with seal door (7) that introduction port (4) were opened or were closed.

2. The material thermal extension test device according to claim 1, further comprising a test rod (9) for suspending one or more of the clamps (3), wherein the test rod (9) is liftably provided in the preparation chamber (2a) and is accessible to the test chamber (1a) through the sample inlet (4).

3. The material thermal extension test device according to claim 2, characterized in that both ends of the test rod (9) are respectively supported on a support rod (10) in a vertically slidable manner, the upper end of the support rod (10) is located in the preparation chamber (2a), and the lower end thereof extends into the test chamber (1a) through the sample inlet (4).

4. The material thermal extension test device according to claim 3, characterized in that a base frame (11) is provided in the test chamber (1a), and the lower ends of the support rods (10) are mounted on the base frame (11).

5. The material thermal extension test device according to claim 2, further comprising a hanging bar (12), wherein the hanging bar (12) is rotatably provided in the preparation chamber (2a), and the test bar (9) is hung on the hanging bar (12) by a hanging wire (13) wound around the hanging bar (12).

6. The material thermal extension test device according to claim 5, characterized in that it further comprises a rocker (14) for driving the suspension rod (12) in rotation, said rocker (14) being connected at one end to the suspension rod (12) and at the other end protruding out of the preparation box (2).

7. The material thermal extension test device according to claim 6, characterized in that the preparation box (2) is provided with a clamp (15) for fixing the rocker (14).

8. The material thermal extension test device according to claim 2, characterized in that a support block (19) for supporting the test rod (9) is arranged in the test chamber (1a), and the test rod (9) is placed on the support block (19) after entering the test chamber (1 a).

9. The material thermal extension test device according to claim 1, further comprising a pull rod (8) for driving the closing door (7) to move, wherein one end of the pull rod (8) is connected with the closing door (7) and the other end extends out of the preparation box (2).

10. The material thermal extension test device according to claim 1, characterized in that a vertically placed scale (17) is provided inside the test chamber (1 a).