Biaxial stretching device for material stretching experiment

Abstract

The invention provides a biaxial stretching device for a material stretching experiment, and relates to the field of load test stands. The solid propellant is arranged on the base and used for bearing the solid propellant; the plurality of sliding rails are fixed on the base and are radially arranged around the solid propellant; the sliding blocks are connected to the sliding rails in a sliding mode; the top end of each push rod is movably connected to the bearing table, the bearing table is used for bearing the pressing load, and the other end of each push rod is pivoted to the corresponding sliding block; each stretching assembly is provided with a chuck, and the chucks are used for clamping the solid propellants in different directions; through the limiting effect of the first speed limiting device and the second speed limiting device, the moving speed of the first clamping head and the moving speed of the second clamping head are different from the moving speed of the third clamping head and the moving speed of the fourth clamping head, that is, four different tensile loads can be applied to the solid propellant from four directions, and therefore the requirement for tensile testing is met.

Description

Technical Field

[0001] The invention relates to the field of load test benches, in particular to a biaxial stretching device used for material stretching experiments. Background Art

[0002] Solid propellant is a solid fuel compound used in rockets, missiles and other aerospace vehicles. It is generally composed of several substances such as fuel, oxidizer and plasticizer. The main advantages of solid propellant are small size, light weight, simple structure, reliable use, etc. It can generate huge thrust in a very short time, so it is often used in situations that require rapid takeoff or acceleration.

[0003] Solid propellant tensile specimens are used to test the mechanical properties of solid propellant materials. By testing and analyzing the tensile force and deformation of the tensile specimens, key indicators such as strength, ductility, and fracture performance of solid propellant materials can be evaluated.

[0004] The current solid propellant tensile test bench generally uses a uniform tensile method to perform tensile tests on solid propellants, which makes it difficult to fully and comprehensively detect the mechanical properties of solid propellants. It is urgent to develop a test bench that can apply non-uniform tensile loads to solid propellants to solve the current problem. Summary of the invention

[0005] The object of the present invention is to provide a biaxial stretching device for material stretching experiments, which can realize applying expected tensile loads to solid propellants from different directions.

[0006] In a first aspect, an embodiment of the present invention provides a biaxial stretching device for a material stretching experiment, comprising: Base; A solid propellant is disposed on the base, and the base is used to carry the solid propellant; A slide rail group, comprising a first slide rail, a second slide rail, a third slide rail and a fourth slide rail, wherein the slide rail group is fixed on a base, and the first slide rail, the second slide rail, the third slide rail and the fourth slide rail are respectively distributed at 90° equal angles with the center of the base as a rotation axis; A slider group, comprising a first slider, a second slider, a third slider and a fourth slider, wherein the first slider, the second slider, the third slider and the fourth slider are slidably connected to the first slide rail, the second slide rail, the third slide rail and the fourth slide rail respectively; A push rod group, comprising a first push rod, a second push rod, a third push rod and a fourth push rod; the top end of each push rod is movably connected to a bearing platform, the bearing platform is used to bear a downward pressure load, and the other end of each push rod is respectively pivotally connected to each slider; A chuck group, comprising a first chuck, a second chuck, a third chuck and a fourth chuck; wherein the first chuck is indirectly connected to the first push rod through a first speed limiting device, and the first push rod transmits the tensile load of the first push rod to the first chuck through the first speed limiting device; The second chuck is indirectly connected to the second push rod through the second speed limiting device; the second push rod transmits the tensile load of the second push rod to the second chuck through the second speed limiting device; The third clamp is connected to the third slider and moves synchronously with the third slider; The fourth clamp is connected to the fourth slider and moves synchronously with the fourth slider; The tensile loads applied to the solid propellant by the first clamp, the second clamp, the third clamp and the fourth clamp are different.

[0007] Optionally, the first speed limiting device includes: A first slide table slidably mounted on the first slide rail; the first clamp is connected to the first slide table; A first support rod fixed to the first slide platform, the first support rod having a first slot along its vertical direction; the first push rod having a first slot along its extending direction; The first pin is sequentially inserted into the first slot and the first slide slot, so that the first push rod applies a tensile load to the first support rod through the first pin, so as to drive the first support rod to move the first slide table and the first chuck to move.

[0008] Optionally, the second speed limiting device comprises: a second slide table slidably mounted on the second slide rail; the second clamp is connected to the second slide table; A second support rod fixed to the second slide platform, the second support rod having a second slot along its vertical direction; the second push rod having a second slot along its extension direction; The second pin shaft is sequentially inserted into the second clamping groove and the second sliding groove, so that the second push rod applies a tensile load to the second support rod through the second pin shaft, so as to drive the second support rod to move the second slide table and promote the movement of the second chuck.

[0009] Optionally, the first slide rail is perpendicular to the third slide rail, the second slide rail is perpendicular to the fourth slide rail, and the first slide rail and the second slide rail are collinear.

[0010] Optionally, the moving speeds of the first chuck and the second chuck are the same; the moving speeds of the third chuck and the fourth chuck are the same.

[0011] Optionally, the third clamp and the third slider are connected via a first connecting rod, and the length of the first connecting rod is adjustable.

[0012] Optionally, the fourth clamp and the fourth slider are connected together via a second connecting rod, and the length of the second connecting rod is adjustable.

[0013] In the biaxial stretching device for material tensile testing provided in an embodiment of the present invention, the moving speeds of the first chuck and the second chuck are limited respectively by the first speed limiting device and the second speed limiting device, so that the moving speeds of the first chuck and the second chuck are different from the moving speeds of the third chuck and the fourth chuck, that is, 4 different tensile loads can be applied to the solid propellant from 4 directions, thereby meeting the requirements of the tensile test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A schematic structural diagram of a biaxial stretching device for material stretching experiments provided in one embodiment of the present invention.

[0016] Figure 2 A schematic diagram of the detailed structure of a first push rod, a first support rod and a first pin provided in one embodiment of the present invention.

[0017] Icons: 1-base; 2-solid propellant; 31-first slide rail; 32-second slide rail; 33-third slide rail; 34-fourth slide rail; 41-first slider; 42-second slider; 43-third slider; 44-fourth slider; 51-first push rod; 511-first slide groove; 5111-first stop; 52-second push rod; 53-third push rod; 54-fourth push rod; 61-first chuck; 62-second chuck; 63-third chuck; 64-fourth chuck; 7-first speed limiting device; 71-first slide; 72-first support rod; 721-first slot; 73-first pin; 731-first rotating handle; 732-first slide; 8-second speed limiting device; 81-second slide; 82-second support rod; 83-second pin; 91-first connecting rod; 92-second connecting rod; 10-carrying platform. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1 and Figure 2This embodiment provides a biaxial stretching device for material stretching experiments, including: a base 1, a solid propellant 2, a slide rail group, a slider group, a push rod group, a chuck group, a first speed limiting device 7 and a second speed limiting device 8.

[0025] In this embodiment, the base 1 is substantially in the form of a rectangular plate structure to provide support.

[0026] The solid propellant 2 is disposed on the base 1 , and the base 1 is used to carry the solid propellant 2 .

[0027] In this embodiment, the solid propellant 2 has plastic deformation capability. The biaxial stretching device for material tensile testing provided in this embodiment is used to apply tensile loads to the solid propellant 2 from different directions.

[0028] The slide rail group includes a first slide rail 31, a second slide rail 32, a third slide rail 33 and a fourth slide rail 34. The slide rail group is fixed on the base 1. The first slide rail 31, the second slide rail 32, the third slide rail 33 and the fourth slide rail 34 are respectively distributed at 90° with the center of the base 1 as the rotation axis. The solid propellant 2 is located at the center of the slide rail group.

[0029] The slider group includes a first slider 41, a second slider 42, a third slider 43 and a fourth slider 44. The first slider 41, the second slider 42, the third slider 43 and the fourth slider 44 are slidably connected to the first slide rail 31, the second slide rail 32, the third slide rail 33 and the fourth slide rail 34 respectively.

[0030] The above-mentioned slide rails are passed through the slider, and such a design can effectively prevent the slider from being separated from the slide rail when moving from the slide rail.

[0031] The push rod group includes a first push rod 51, a second push rod 52, a third push rod 53 and a fourth push rod 54. The top end of each push rod is movably connected to the bearing platform 10, and the bearing platform 10 is used to bear the downward pressure load. The other end of each push rod is pivotally connected to each slider.

[0032] The bearing platform 10 is in a cross-shaped structure, and the bearing platform 10 and the top of the push rod group are specifically hinged together. When the bearing platform 10 bears a downward pressure load, the downward pressure load can be transmitted to the push rod group connected thereto.

[0033] The chuck group includes a first chuck 61, a second chuck 62, a third chuck 63 and a fourth chuck 64. The first chuck 61 is indirectly connected to the first push rod 51 through the first speed limiting device 7, and the first push rod 51 transmits the tensile load of the first push rod 51 to the first chuck 61 through the first speed limiting device 7.

[0034] The second clamp 62 is indirectly connected to the second push rod 52 through the second speed limiting device 8. The second push rod 52 transmits the tensile load of the second push rod 52 to the second clamp 62 through the second speed limiting device 8.

[0035] The third clamping head 63 is connected to the third sliding block 43 and moves synchronously with the third sliding block 43 .

[0036] Specifically, in this embodiment, the third clamp 63 and the third slider 43 are connected together through the first connecting rod 91. The length of the first connecting rod 91 is adjustable, and the distance between the third clamp 63 and the third slider 43 is limited by adjusting the length of the first connecting rod 91.

[0037] The fourth clamp 64 is connected to the fourth slider 44 and moves synchronously with the fourth slider 44 .

[0038] Specifically, in this embodiment, the fourth clamp 64 and the fourth slider 44 are connected together by a second connecting rod 92. The length of the second connecting rod 92 is adjustable, and the distance between the fourth clamp 64 and the fourth slider 44 is limited by adjusting the length of the second connecting rod 92.

[0039] The tensile loads applied to the solid propellant 2 by the first clamp 61 , the second clamp 62 , the third clamp 63 and the fourth clamp 64 are not completely the same.

[0040] Specifically, in this embodiment, the first speed limiting device 7 includes: A first slide table 71 is slidably mounted on the first slide rail 31 . The first clamp 61 is connected to the first slide table 71 .

[0041] The first support rod 72 is fixed to the first slide platform 71, and the first support rod 72 has a first slot 721 along its vertical direction. The first push rod 51 has a first slot 511 along its extending direction.

[0042] The first pin 73 is sequentially inserted into the first slot 721 and the first slide slot 511 , so that the first push rod 51 applies a tensile load to the first support rod 72 through the first pin 73 , so as to drive the first support rod 72 to move the first slide 71 and the first clamp 61 .

[0043] Specifically, in this embodiment, the second speed limiting device 8 includes: The second slide table 81 is slidably mounted on the second slide rail 32. The second clamping head 62 is connected to the second slide table 81.

[0044] The second support rod 82 is fixed to the second slide platform 81, and the second support rod 82 has a second slot along its vertical direction. The second push rod 52 is provided with a second slot along its extending direction.

[0045] The second pin 83 is sequentially inserted into the second slot and the second slide slot, so that the second push rod 52 applies a tensile load to the second support rod 82 through the second pin 83, so as to drive the second support rod 82 to move the second slide 81 and the second clamp 62.

[0046] As described above, in this embodiment, the moving speeds of the first chuck 61 and the second chuck 62 are limited respectively by the first speed limiting device 7 and the second speed limiting device 8, so that the moving speeds of the first chuck 61 and the second chuck 62 are different from the moving speeds of the third chuck 63 and the fourth chuck 64, that is, 4 different tensile loads can be applied to the solid propellant 2 from 4 directions, thereby meeting the requirements of the tensile test.

[0047] Furthermore, if Figure 2 In order to achieve different speed limiting effects of the first speed limiting device 7 , in this embodiment, the first slide groove 511 of the first push rod 51 has a plurality of first stops 5111 along the extending direction of the first slide groove 511 .

[0048] One end of the first pin shaft 73 has a first rotating handle 731, and a first clamping platform 732 is formed on the body of the first pin shaft 73. When the first pin shaft 73 is successively inserted into the first clamping groove 721 and the first slide groove 511, the first clamping platform 732 is selected to be clamped into the first stop 5111 at different positions, so as to realize the first push rod 51 and the first support rod 72 to be rotatably connected at different positions. The first pin shaft 73 substantially acts as a "hinge" for the rotatable connection between the first push rod 51 and the first support rod 72. By selecting the first card platform 732 to be inserted into the first stop 5111 at different positions, the distance between the first support rod 72 and the first slider 41 can be adjusted. In this way, when the first push rod 51 is pressed down again to push the first slider 41 to move, the moving speed of the first support rod 72 can be changed, thereby changing the moving speed of the first clamp 61. In this way, the first clamp 61 can exert different tensile loads on the solid propellant 2. In other words, by selecting the first card platform 732 to be inserted into the first stop 5111 at different positions, it is equivalent to achieving a "gear shifting" effect on the moving speed of the first clamp 61.

[0049] Similarly, the second support rod 82 and the first support rod 72, the second pin 83 and the first pin 73, the second push rod 52 and the first push rod 51 all adopt the same structural configuration, the same operating principle, and belong to a symmetrical structure, so that the "shifting" effect of the moving speed of the second clamp 62 can also be achieved. In this way, the second clamp 62 can also apply different tensile loads to the solid propellant 2.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A biaxial stretching device for material stretching experiments, characterized in that: include: Base; A solid propellant is disposed on the base, and the base is used to carry the solid propellant; A slide rail group, comprising a first slide rail, a second slide rail, a third slide rail and a fourth slide rail, wherein the slide rail group is fixed on a base, and the first slide rail, the second slide rail, the third slide rail and the fourth slide rail are respectively distributed at 90° equal angles with the center of the base as a rotation axis; A slider group, comprising a first slider, a second slider, a third slider and a fourth slider, wherein the first slider, the second slider, the third slider and the fourth slider are slidably connected to the first slide rail, the second slide rail, the third slide rail and the fourth slide rail respectively; A push rod group, including a first push rod, a second push rod, a third push rod and a fourth push rod; the top end of each push rod is movably connected to a bearing platform, the bearing platform is used to bear a downward pressure load, and the other end of each push rod is respectively pivotally connected to each of the sliders; A chuck group, comprising a first chuck, a second chuck, a third chuck and a fourth chuck; wherein the first chuck is indirectly connected to the first push rod through a first speed limiting device, and the first push rod transmits the tensile load of the first push rod to the first chuck through the first speed limiting device; The second chuck is indirectly connected to the second push rod through the second speed limiting device; the second push rod transmits the tensile load of the second push rod to the second chuck through the second speed limiting device; The third clamp is connected to the third slider and moves synchronously with the third slider; The fourth clamp is connected to the fourth slider and moves synchronously with the fourth slider; The tensile loads applied to the solid propellant by the first clamp, the second clamp, the third clamp and the fourth clamp are different.

2. The biaxial stretching device for material stretching test according to claim 1, characterized in that: The first speed limiting device comprises: A first slide table slidably mounted on the first slide rail; the first clamp is connected to the first slide table; A first support rod fixed to the first slide platform, the first support rod having a first slot along its vertical direction; the first push rod having a first slot along its extending direction; The first pin is sequentially inserted into the first slot and the first slide slot, so that the first push rod applies a tensile load to the first support rod through the first pin, so as to drive the first support rod to move the first slide table and the first chuck to move.

3. The biaxial stretching device for material stretching test according to claim 1, characterized in that: The second speed limiting device comprises: A second slide table slidably mounted on the second slide rail; the second chuck is connected to the second slide table; A second support rod fixed to the second slide platform, the second support rod having a second slot along its vertical direction; the second push rod having a second slot along its extension direction; The second pin shaft is sequentially inserted into the second clamping groove and the second sliding groove, so that the second push rod applies a tensile load to the second support rod through the second pin shaft, so as to drive the second support rod to move the second slide table and promote the movement of the second chuck.

4. The biaxial stretching device for material stretching test according to claim 1, characterized in that: The first slide rail is perpendicular to the third slide rail, the second slide rail is perpendicular to the fourth slide rail, and the first slide rail and the second slide rail are collinear.

5. The biaxial stretching device for material stretching test according to claim 1, characterized in that: The moving speeds of the first chuck and the second chuck are the same; the moving speeds of the third chuck and the fourth chuck are the same.

6. The biaxial stretching device for material stretching test according to claim 1, characterized in that: The third clamp and the third slider are connected via a first connecting rod, and the length of the first connecting rod is adjustable.

7. The biaxial stretching device for material stretching test according to claim 1, characterized in that: The fourth clamp and the fourth slider are connected together via a second connecting rod, and the length of the second connecting rod is adjustable.

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