CN214277741U

CN214277741U - Heat preservation device for low temperature tensile test

Info

Publication number: CN214277741U
Application number: CN202023350421.7U
Authority: CN
Inventors: 林天委; 任永沟; 骆旭梁; 陈影; 陈亚琴
Original assignee: Ningbo Yongan Testing Technology Co ltd
Current assignee: Ningbo Yongan Testing Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-09-24
Anticipated expiration: 2030-12-31

Abstract

The application relates to a heat preservation device for a low-temperature tensile test, which relates to the technical field of heat preservation and comprises a buckle seat and a lock seat, wherein the buckle seat and the lock seat are arranged on one side of a box body, which is far away from a pin joint; the box body is provided with a first handle, and the first handle is provided with a first lifting assembly used for lifting the breaking-off block to separate the lock strip from the buckle seat; the box body is further provided with a second handle, and a second lifting assembly used for lifting the lock bar to be separated from the buckle seat is arranged on the second handle. This application has the injury that reduces the hand, improves the effect of the security of using.

Description

Heat preservation device for low temperature tensile test

Technical Field

The application relates to the field of heat preservation, in particular to a heat preservation device for a low-temperature tensile test.

Background

The tensile testing machine is also called a material tensile testing machine and a universal tensile strength testing machine, and is a new generation of mechanical detection equipment integrating computer control, automatic measurement, data acquisition, screen display and test result processing.

When a test needs to be carried out in a low-temperature environment, a heat preservation device which lasts at a low temperature needs to be provided, so that the environment during detection is a low-temperature environment.

In the related art, as disclosed in chinese patent No. CN203396654U, a low-temperature tensile test system for twisted steel comprises a box device for placing a sample, a liquid nitrogen device system for cooling, a temperature control system for controlling the test temperature, and a tensile test device, wherein the box device comprises an inner layer, an intermediate insulating layer, an outer layer, a base, and a box cover; the liquid nitrogen device system consists of a liquid nitrogen tank, a guide pipe connector, an internal liquid nitrogen pipe, a gasification net and a liquid discharge valve; the temperature control system consists of a temperature sensor and a temperature control and regulation system. The tensile test device comprises a tensile test machine and a connecting rod connected with the tensile test machine.

In view of the above-mentioned related art, the inventor believes that when the pipeline to be tested needs to be taken out of the heat preservation device, the lock catch needs to be opened, and at this time, the temperature outside the heat preservation device is affected by the temperature in the heat preservation device, so that the safety hazard is generated by manual operation, and the improvement space is provided.

SUMMERY OF THE UTILITY MODEL

In order to reduce the injury to the hand, improve the security of using, this application provides a heat preservation device for low temperature tensile test.

The application provides a heat preservation device for low temperature tensile test adopts following technical scheme:

a heat preservation device for a low-temperature tensile test comprises a pivoted box body, wherein a buckling seat and a lock seat are arranged on one side, far away from the pivoting, of the box body, a breaking block is hinged to the lock seat, a connecting piece is hinged to one side, far away from the lock seat, of the breaking block, and a locking strip which is connected with the buckling seat and buckled with the buckling seat is arranged on one side, far away from the lock seat, of the connecting piece;

a first handle is arranged on the box body, and a first lifting assembly used for lifting the breaking-off block to separate the lock bar from the buckle seat is arranged on the first handle;

the box body is further provided with a second handle, and the second handle is provided with a second lifting assembly used for lifting the locking bar to be separated from the buckle seat.

Through adopting above-mentioned technical scheme, through the setting of hasp and lock seat to lock between two boxes, and the locking is fixed through breaking off with the fingers and thumb piece, connection piece and locking strip, and the first lifting subassembly in the first in command cooperates the second lifting subassembly on the second in command, thereby detains the seat and breaks away from with the locking strip with the control, and the practicality is strong.

Optionally, the first lifting assembly comprises:

the first cover plate is connected to one side, close to the box body, of the first handle in a sliding mode;

the first mounting block is connected to the first cover plate in a sliding manner;

the first limiting plate is arranged on one side, close to the first handle, of the first mounting block and is mutually limited with the first cover plate;

the first transmission rod is arranged on one side, away from the first mounting block, of the first limiting plate and moves synchronously with the first limiting plate;

the first pressure spring is arranged on the first handle, the other end of the first pressure spring is abutted against the first limiting plate and/or the first transmission rod to be compressed, and the first pressure spring is used for driving the first limiting plate and the first transmission rod to be far away from one side far away from the first handle;

the first connecting seat is arranged on one side of the breaking-off block, which is far away from the box body;

the first connecting rod is used for hinging the first connecting seat and the first transmission rod;

the first tension spring is arranged between the first connecting rod and the first handle and is used for driving the first connecting rod to approach towards the direction of the first handle;

the first handle is provided with a first sliding groove for a first cover plate to be slidably mounted, the first cover plate is provided with a first movable groove for a first connecting rod to move, and the first cover plate is provided with a first moving groove for a first mounting block to slide and a first limiting plate to limit mutually;

the first pressure spring pushes the first mounting block out to one side far away from the first handle for resetting, the first limiting plate and the first cover plate are limited mutually, and the first transmission rod is connected with the first handle through the first tension spring.

By adopting the technical scheme, the first mounting block is matched with the first limiting plate, so that the first mounting block is pressed on the first cover plate and then reset by combining the first pressure spring; and first transfer lever carries out synchronous motion with first limiting plate, and first extension spring is injectd the head rod to the auxiliary motion, the setting of first connecting seat will be convenient for open the piece through the first connecting rod with breaking off with the fingers and thumb.

Optionally, the second lift assembly comprises:

the second cover plate is connected to one side, close to the box body, of the second handle in a sliding mode;

the second mounting block is connected to the second handle in a sliding manner;

the second limiting plate is arranged on one side, close to the second cover plate, of the second mounting block and is mutually limited with the second handle;

the second connecting seat is arranged on the second handle;

the second transmission rod is hinged to the second connecting seat, and one end of the second transmission rod is controlled by the second limiting plate;

the second movable wheel is rotatably connected to one side, close to the second limiting plate, of the second transmission rod and is in abutting connection with the second limiting plate;

the second connecting rope is used for connecting one side of the second transmission rod, which is far away from the second limiting plate, with the locking bar;

the second pressure spring is arranged on the second cover plate, the other end of the second pressure spring is abutted against the second limiting plate and is pressed tightly, and the second pressure spring is used for driving the second limiting plate to move away from one side far away from the second handle;

the second handle is provided with a second sliding groove for sliding installation of the second cover plate, the second cover plate is provided with a second movable groove for movement of the second connecting rope, and the second handle is provided with a second movable groove for sliding of the second installation block and mutual limiting with the second limiting plate.

Through adopting above-mentioned technical scheme, the setting of second installation piece cooperation second limiting plate to make the second installation piece press on the second apron, and second connecting seat and the pin joint of second transfer line, thereby the setting of cooperation second loose wheel, thereby make the second transfer line carry out the atress under the drive of second limiting plate, the second pressure spring is used for resumeing the second installation piece, and the second transfer line will drive the second and connect the rope, thereby drive the locking strip and lift up.

Optionally, the connecting piece comprises a rotating plate pivoted with the breaking-off block, a locking plate for fixing the locking bar and a locking tension spring;

the locking tension spring drives the rotating plate and the locking plate to approach each other, the locking tension spring is sleeved on the rotating plate and the locking plate, one end of the locking tension spring is fixed with the rotating plate, and the other end of the locking tension spring is fixed with the locking plate;

the locking plate is provided with a locking plate, the locking plate is provided with a sliding groove for the sliding of the sliding block along the length direction of the locking plate, the sliding block is provided with a cover block for fixing the rotating plate to the locking plate, and the cover block is connected with the locking plate in a sliding mode.

By adopting the technical scheme, the rotating plate and the locking plate mutually slide and are connected through the locking tension spring, so that transmission is completed; the sliding block is mutually matched with the sliding groove in a sliding mode and is fixed through the cover block.

Optionally, the first handle and the second handle are both provided with handle seats, and the box body is provided with handle grooves for mounting the handle seats.

Through adopting above-mentioned technical scheme, through the setting of handle seat, the use in cooperation handle groove to stability between handle seat and the box will have been improved, reduce rocking of handle seat, improve holistic stability.

Optionally, a clamping hook is arranged on one side, close to the box body, of the handle seat, an embedding groove for inserting the clamping hook is formed in the box body, and a clamping groove for fixing the clamping hook in a sliding manner and communicating with the embedding groove is formed in the box body.

Through adopting above-mentioned technical scheme, through the setting of pothook, make the pothook slide along the direction of draw-in groove again after passing through the caulking groove to realize fixing between pothook and the handle seat, and more stable, the practicality is strong.

Optionally, the hook is further provided with a rotating column, the handle seat is provided with a rotating groove for the rotating column to penetrate through for rotation, a rotating disc is coaxially arranged on one side of the rotating column away from the box body, and the rotating disc is limited on one side of the handle seat away from the box body;

the box body is provided with a rotating groove for the rotary clamping of the clamping hook.

Through adopting above-mentioned technical scheme, through the setting of rotating the post, the use in cooperation rotary trough to rotate the pothook, and the setting of carousel, further improvement maneuverability, and the setting in rotary trough supplies the pothook to rotate, thereby has improved holistic stability.

Optionally, a plurality of rotating columns are arranged on the rotating disc, and rotating holes for inserting the rotating columns are formed in the rotating columns.

Through adopting above-mentioned technical scheme, through the setting of rotating the post, the use in cooperation rotation hole to can stabilize between carousel and the rotation post, improve stability between the two, reduce and skid, the practicality is strong.

Optionally, a holding block for holding by a hand to operate the rotary table is further disposed on a side of the rotary table away from the handle seat.

Through adopting above-mentioned technical scheme, through the setting of gripping the piece, conveniently supply the hand to grip, improved people to carousel pivoted efficiency, conveniently operate, the practicality is strong.

Optionally, the turntable is further provided with an indication block for indicating the rotation locking direction of the hook.

Through adopting above-mentioned technical scheme, the setting of instruction piece makes people can see the direction when rotating through the carousel to reduce and change wrong direction, in order to reduce the damage to the pothook, improve life.

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

1. the damage to hands is reduced, and the use safety is improved;

2. the handle is convenient to install and does not need tools.

Drawings

FIG. 1 is a schematic view of the structure of a heat retaining device for low-temperature tensile test.

FIG. 2 is a first schematic view of the first handle, the second handle and the box.

FIG. 3 is a second schematic view of the installation of the first handle, the second handle and the box.

Fig. 4 is an enlarged schematic view of the hook of part a in fig. 2.

Fig. 5 is an enlarged schematic view of the hook of the part B in fig. 3.

Figure 6 is an exploded view of the first handle.

Figure 7 is an exploded view of the second handle.

Fig. 8 is an exploded view of the first handle.

Fig. 9 is an exploded view of the second handle.

Description of reference numerals: 203. a box body; 60. a buckle seat; 61. a lock seat; 62. breaking off the blocks; 63. connecting sheets; 64. a locking bar; 65. a first handle; 66. a first lift assembly; 660. a first cover plate; 661. a first mounting block; 662. a first limit plate; 663. a first drive lever; 664. a first pressure spring; 665. a first connecting seat; 666. a first connecting rod; 667. a first tension spring; 668. a first sliding groove; 669. a first movable slot; 670. a first moving slot; 67. a second handle; 68. a second lift assembly; 680. a second cover plate; 681. a second mounting block; 682. a second limiting plate; 683. a second connecting seat; 684. a second transmission rod; 685. a second movable wheel; 686. a second connecting rope; 687. a second pressure spring; 688. a second sliding groove; 689. a second movable slot; 690. a second moving slot; 800. a rotating plate; 801. a locking plate; 802. locking the tension spring; 803. a slider; 804. a chute; 805. a cover block; 806. a handle base; 807. a handle slot; 808. a hook; 809. caulking grooves; 810. a card slot; 811. rotating the column; 812. rotating the groove; 813. a turntable; 814. a rotating groove; 815. turning the column; 816. rotating the hole; 817. a holding block; 818. the block is indicated.

Detailed Description

The present application is described in further detail below with reference to figures 1-9.

The embodiment of the application discloses heat preservation device for low temperature tensile test reduces the injury to the hand, improves the security of using.

Referring to fig. 1, the heat preservation device for the low temperature tensile test comprises symmetrically pivoted box bodies 203, a first handle 65 and a second handle 67 are arranged on one side, far away from the pivoted side, of each box body 203, the box body 203 on one side is operated through the first handle 65, and the box body 203 on the other side is operated through the second handle 67.

Referring to fig. 2 and 3, a buckle base 60 and a lock base 61 are fixed on one side of the box 203 far from the pivot joint through bolts, and the buckle base 60 and the lock base 61 are located on different boxes 203. One side of the lock seat 61 close to the buckle seat 60 is hinged with a breaking block 62, one side of the breaking block 62 far away from the lock seat 61 is hinged with a connecting sheet 63, and one side of the connecting sheet 63 far away from the lock seat 61 is fixed with a lock bar 64 connected and buckled with the buckle seat 60.

Referring to fig. 2 and 3, the coupling piece 63 includes a rotating plate 800, a locking plate 801, and a locking tension spring 802. The rotating plate 800 is symmetrically arranged and pivotally connected with the snapping block 62, the locking plate 801 is connected with the rotating plate 800 in a sliding manner and used for fixing the locking bar 64, and the locking compression spring is sleeved on the locking plate 801 and the rotating plate 800.

A sliding block 803 is integrally arranged on one side of the rotating plate 800 close to the locking plate 801, a sliding groove 804 for allowing the sliding block 803 to slide along the length direction of the locking plate 801 is formed in the locking plate 801, a cover block 805 for fixing the rotating plate 800 to the locking plate 801 is fixed on the sliding block 803 through bolts, and the cover block and the locking plate 801 are abutted and slid.

The locking tension spring 802 drives the rotating plate 800 and the locking plate 801 to close each other, and one end of the locking tension spring 802 is fixedly inserted into the rotating plate 800, and the other end of the locking tension spring 802 is fixedly inserted into the locking plate 801, and can be reinforced by epoxy resin glue when necessary.

Referring to fig. 3 and 4, the first handle 65 and the second handle 67 are uniformly and integrally provided with handle seats 806, and the box 203 is provided with handle grooves 807 for mounting the handle seats 806. The handle seat 806 is provided with a hook 808 on one side close to the box body 203, the box body 203 is provided with an embedding groove 809 for inserting the hook 808, the box body 203 is provided with a clamping groove 810 for sliding the hook 808 downwards and fixing, and the clamping groove 810 is communicated with the embedding groove 809.

Referring to fig. 3 and 4, a rotation post 811 is integrally disposed on one side of the hook 808 close to the handle seat 806, and a rotation slot 812 for the rotation post 811 to rotate is disposed on the handle seat 806.

Rotate post 811 and keep away from the one end of pothook 808 and install carousel 813, carousel 813 and the coaxial setting of rotation post 811, carousel 813 is spacing in one side that box 203 was kept away from to handle seat 806, set up the rotation groove 814 that supplies the rotatory joint of pothook 808 on the box 203, pothook 808 is when the installation, preferably down so that slide downwards in step with handle seat 806, handle groove 807 also supplies handle seat 806 to slide this moment, thereby make pothook 808 insert in the rotating groove 812, the rethread is rotatory, thereby get into and rotate and lock in the groove 814.

Referring to fig. 4 and 5, a plurality of rotation posts 815 are integrally formed on the rotation plate 813, rotation holes 816 into which the rotation posts 811 are inserted are formed in the rotation posts 811, and the rotation posts 815 are coated with epoxy glue if necessary, thereby reinforcing the rotation plate 813 and the rotation posts 811.

A holding block 817 is integrally arranged on the side of the rotary plate 813 away from the handle seat 806, and the holding block 817 is held by a hand to operate the rotary plate 813. In order to improve the indicating capability, an indicating block 818 for indicating the rotation locking direction of the hook 808 is integrally provided on the dial 813.

Referring to FIG. 3, a first lift assembly 66 is also mounted to the first handle 65. The first lifting assembly 66 is used for lifting the breaking block 62 to separate the locking bar 64 from the buckle base 60.

Referring to fig. 6 and 7, the first lifting assembly 66 includes a first cover plate 660, a first mounting block 661, a first limiting plate 662, a first transmission rod 663, a first compression spring 664, a first connection seat 665, a first connection rod 666 and a first tension spring 667.

The first cover plate 660 slides on the first handle 65, a first sliding groove 668 for the sliding installation of the first cover plate 660 is arranged on the first handle 65, and the first cover plate 660 is fixed with the first handle 65 through bolts after the sliding fit.

The first limit plate 662 is integrally arranged with the first mounting block 661, the first cover plate 660 is provided with a first moving groove 670 for the first mounting block 661 to slide, the first moving groove 670 also provides the first limit plate 662 to limit each other, and the first transmission rods 663 are symmetrically arranged at two sides of the first limit plate 662; under the movement of the first mounting block 661, the first driving rod 663 moves synchronously with the first stopper plate 662.

The first pressure spring 664 is bonded to the first handle 65 through epoxy glue, and the other end of the first pressure spring 664 is bonded and fixed to the first limit plate 662, so that the first pressure spring 664 is located between the first handle 65 and the first limit plate 662, and the first pressure spring 664 can also be located between the first handle 65 and the first transmission rod 663.

The first pressure spring 664 is used for driving the first limiting plate 662 and the first transmission rod 663 to be away from one side away from the first handle 65, namely the first pressure spring 664 pushes the first mounting block 661 to be reset towards the side away from the first handle 65, the first limiting plate 662 and the first cover plate 660 are limited mutually, and a worker adjusts the number and the position of the first pressure spring 664 according to actual conditions.

A first tension spring 667 is installed between the first connecting rod 666 and the first handle 65, one end of the first tension spring 667 is provided for penetrating through the first connecting rod 666, and is reinforced through epoxy resin glue; the first handle 65 is connected to the other end of the first handle 65 and is reinforced by epoxy glue. The first tension spring 667 is used for driving the first link rod 666 to move toward the first handle 65, and the tension of the first tension spring 667 is smaller than the pressure of the first compression spring 664.

One end of the first connecting rod 666 is hinged to one side of the first transmission rod 663 far away from the first limiting plate 662, the first connecting seat 665 is integrally arranged at one side of the breaking-off block 62 close to the first handle 65, and the other end of the first connecting rod 666 is hinged to the first connecting seat 665, and the first cover plate 660 is provided with a first movable groove 669 for the first connecting rod 666 to move, so that the first connecting seat 665 and the breaking-off block 62 are lifted together through the first connecting rod 666.

Referring to FIG. 2, a second lift assembly 68 is also mounted on the second handle 67. The second lifting assembly 68 is used to lift the locking bar 64 out of the socket 60.

Referring to fig. 8 and 9, the second lifting assembly 68 includes a second cover plate 680, a second mounting block 681, a second limit plate 682, a second coupling seat 683, a second transmission rod 684, a second movable sheave 685, a second connection cord 686, and a second compression spring 687.

The second cover plate 680 is slidably connected to one side of the second handle 67 close to the box 203, a second sliding groove 688 for slidably mounting the second cover plate 680 is formed in the second handle 67, and the second cover plate 680 is fixedly connected to the second handle 67 through bolts.

Second installation piece 681 is an organic whole setting with second limiting plate 682, and be provided with on the second handle 67 and supply second installation piece 681 to wear to establish the second shifting chute 690 that slides, and second shifting chute 690 is spacing mutually with second limiting plate 682, second pressure spring 687 bonds on second apron 680 through epoxy glue, and the other end of second pressure spring 687 contradicts with second limiting plate 682 and compresses tightly, second pressure spring 687 is used for ordering about second limiting plate 682 and keeps away from to the one side of keeping away from second handle 67, in order to realize reseing.

The second connecting seat 683 is integrally arranged on the second handle 67, and the second connecting seat 683 is hinged to the second transmission rod 684, and the second transmission rod 684 is controlled by one side of the second limiting plate 682 to be rotatably connected with the second movable wheel 685, so that the second movable wheel 685 is abutted against the second limiting plate 682, and the other end of the second transmission rod 684 is conveniently lifted to realize the lever effect.

The second connecting rope 686 is used for connecting the second driving rod 684 with the locking bar 64, and a second movable groove 689 for the second connecting rope 686 to move is formed in the second cover plate 680. Once the second actuator rod 684 is raised, the second linking cord 686 is carried along, thereby raising the locking bar 64 out of the engaged position.

The working principle is as follows:

the first mounting block 661 on the first handle 65 is pressed down to drive the first limiting plate 662 and the first driving rod 663, and the first driving rod 663 drives the first connecting seat 665 on the breaking-off block 62 to lift the breaking-off block 62; the second mounting block 681 of the second handle 67 is pushed down to drive the second stopper plate 682, and one end of the second transmission rod 684 is pushed down to pull up the second connection cord 686 to drive the locking bar 64 to be lifted up to be separated from the buckle holder 60, at which time the boxes 203 can be separated from each other and opened.

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

Claims

1. The utility model provides a heat preservation device for low temperature tensile test, includes box (203) of pin joint, its characterized in that: a buckling seat (60) and a locking seat (61) are arranged on one side, far away from the pivoting, of the box body (203), a breaking block (62) is hinged to the locking seat (61), a connecting sheet (63) is hinged to one side, far away from the locking seat (61), of the breaking block (62), and a locking strip (64) which is connected and buckled with the buckling seat (60) is arranged on one side, far away from the locking seat (61), of the connecting sheet (63);

a first handle (65) is arranged on the box body (203), and a first lifting assembly (66) used for lifting the breaking-off block (62) to separate the lock strip (64) from the buckle seat (60) is arranged on the first handle (65);

the box body (203) is further provided with a second handle (67), and a second lifting assembly (68) used for lifting the locking strip (64) to be separated from the buckle seat (60) is arranged on the second handle (67).

2. The heat-insulating device for the low-temperature tensile test according to claim 1, characterized in that: the first lift assembly (66) includes:

the first cover plate (660) is connected to one side, close to the box body (203), of the first handle (65) in a sliding mode;

the first mounting block (661) is connected to the first cover plate (660) in a sliding manner;

the first limiting plate (662) is arranged on one side, close to the first handle (65), of the first mounting block (661), and is limited with the first cover plate (660);

the first transmission rod (663) is arranged on one side, away from the first mounting block (661), of the first limiting plate (662) and moves synchronously with the first limiting plate (662);

the first pressure spring (664) is arranged on the first handle (65), the other end of the first pressure spring is pressed against the first limit plate (662) and/or the first transmission rod (663), and the first pressure spring is used for driving the first limit plate (662) and the first transmission rod (663) to be far away from one side far away from the first handle (65);

the first connecting seat (665) is arranged on one side of the breaking-off block (62) far away from the box body (203);

the first connecting rod (666) is used for hinging the first connecting seat (665) and the first transmission rod (663);

the first tension spring (667) is arranged between the first connecting rod (666) and the first handle (65) and is used for driving the first connecting rod (666) to approach towards the direction of the first handle (65);

a first sliding groove (668) for a first cover plate (660) to be installed in a sliding mode is formed in the first handle (65), a first movable groove (669) for a first connecting rod (666) to move is formed in the first cover plate (660), and a first moving groove (670) for a first installing block (661) to slide and for a first limiting plate (662) to limit mutually is formed in the first cover plate (660);

the first pressure spring (664) pushes the first mounting block (661) to one side away from the first handle (65) for resetting, the first limiting plate (662) and the first cover plate (660) are limited mutually, and the first transmission rod (663) is connected with the first handle (65) through the first tension spring (667).

3. The heat-insulating device for the low-temperature tensile test according to claim 1, characterized in that: the second lift assembly (68) comprising:

the second cover plate (680) is connected to one side, close to the box body (203), of the second handle (67) in a sliding mode;

a second mounting block (681) slidably coupled to the second handle (67);

the second limiting plate (682) is arranged on one side, close to the second cover plate (680), of the second mounting block (681) and is mutually limited with the second handle (67);

a second connecting seat (683) arranged on the second handle (67);

the second transmission rod (684) is hinged to the second connecting seat (683), and one end of the second transmission rod is controlled by a second limiting plate (682);

the second movable wheel (685) is rotatably connected to one side, close to the second limiting plate (682), of the second transmission rod (684) and is in interference connection with the second limiting plate (682);

the second connecting rope (686) is used for connecting one side, far away from the second limit plate (682), of the second transmission rod (684) and the lock bar (64);

the second pressure spring (687) is arranged on the second cover plate (680), the other end of the second pressure spring is abutted against the second limiting plate (682) to be pressed, and the second pressure spring is used for driving the second limiting plate (682) to be far away from one side far away from the second handle (67);

be provided with on second handle (67) and supply second apron (680) the second groove (688) that slides of installation, be provided with on second apron (680) and supply the second to connect second activity groove (689) of rope (686) activity, be provided with on second handle (67) and supply second installation piece (681) to slide and with second limiting plate (682) spacing second shifting groove (690) each other.

4. The heat-insulating device for the low-temperature tensile test according to claim 1, characterized in that: the connecting piece (63) comprises a rotating plate (800) pivoted with the breaking-off block (62), a locking plate (801) used for fixing the locking bar (64) and a locking tension spring (802);

the locking tension spring (802) drives the rotating plate (800) and the locking plate (801) to be close to each other, the locking tension spring (802) is sleeved on the rotating plate (800) and the locking plate (801), one end of the locking tension spring (802) is fixed with the rotating plate (800), and the other end of the locking tension spring (802) is fixed with the locking plate (801);

the rotary plate (800) is provided with a sliding block (803), the locking plate (801) is provided with a sliding groove (804) for the sliding block (803) to slide along the length direction of the locking plate (801), the sliding block (803) is provided with a cover block (805) for fixing the rotary plate (800) to the locking plate (801), and the cover block (805) is connected with the locking plate (801) in a sliding manner.

5. The heat-insulating device for the low-temperature tensile test according to claim 1, characterized in that: the first handle (65) and the second handle (67) are both provided with handle seats (806), and the box body (203) is provided with handle grooves (807) for mounting the handle seats (806).

6. The heat-insulating device for the low-temperature tensile test according to claim 5, characterized in that: a clamping hook (808) is arranged on one side, close to the box body (203), of the handle seat (806), an embedding groove (809) for the clamping hook (808) to be inserted is arranged on the box body (203), and a clamping groove (810) for the clamping hook (808) to slide and fix and communicated with the embedding groove (809) is arranged on the box body (203).

7. The heat-insulating device for the low-temperature tensile test according to claim 6, characterized in that: the grab (808) is also provided with a rotating column (811), the handle seat (806) is provided with a rotating groove (812) for the rotating column (811) to penetrate through for rotation, a rotating disc (813) is coaxially arranged on one side of the rotating column (811) far away from the box body (203), and the rotating disc (813) is limited on one side of the handle seat (806) far away from the box body (203);

the box body (203) is provided with a rotating groove (814) for the hook (808) to rotate and clamp.

8. The heat-insulating device for the low-temperature tensile test according to claim 7, characterized in that: the rotary table (813) is provided with a plurality of rotary columns (815), and the rotary columns (811) are provided with rotary holes (816) for inserting the rotary columns (811).

9. The heat-insulating device for the low-temperature tensile test according to claim 7, characterized in that: the side of the rotating disc (813) far away from the handle seat (806) is also provided with a holding block (817) for holding by hands to operate the rotating disc (813).

10. The heat-insulating device for the low-temperature tensile test according to claim 7, characterized in that: the rotating disc (813) is also provided with an indicating block (818) for indicating the rotating and locking direction of the hook (808).