A biaxial stretching device for material tensile experiment

Abstract

The application provides a biaxial stretching device for material stretching experiment, and relates to the field of load test benches, which comprises a base, a solid propellant arranged on the base and used for bearing the solid propellant, a plurality of sliding rails fixed on the base and arranged radially around the solid propellant, a plurality of sliding blocks respectively slidably connected to the sliding rails, a plurality of push rods, the top end of each push rod is movably connected to a bearing table, the bearing table is used for bearing downward pressure load, the other end of each push rod is respectively pivotally connected to each sliding block, and each stretching assembly has a chuck, each chuck is used for clamping the solid propellant from different directions. Through the limiting effect of the first speed limiting device and the second speed limiting device, the moving speed of the first chuck and the second chuck is different from the moving speed of the third chuck and the fourth chuck, that is, four different stretching loads can be applied to the solid propellant from four directions, so that the demand of stretching test can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of load test bench, in particular to a biaxial stretching device for material tensile experiment. BACKGROUND

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

[0003] Solid propellant tensile specimen is a specimen form for testing the mechanical properties of solid propellant material. By testing and analyzing the tensile force and deformation of the tensile specimen, the strength, ductility, fracture performance and other key indicators of the solid propellant material can be evaluated.

[0004] The current solid propellant tensile test bench generally uses uniform stretching to test the solid propellant, which is difficult to fully and comprehensively detect the mechanical properties of the solid propellant. A test bench that can apply non-uniform tensile load to the solid propellant is urgently needed to solve the current problem. SUMMARY

[0005] The purpose of the present application is to provide a biaxial stretching device for material tensile experiment, which can apply expected tensile load to solid propellant from different directions.

[0006] In a first aspect, the embodiments of the present application provide a biaxial stretching device for material tensile experiment, comprising:

[0007] a base;

[0008] a solid propellant disposed on the base, the base for carrying the solid propellant;

[0009] a slide rail set including a first slide rail, a second slide rail, a third slide rail and a fourth slide rail, the slide rail set being fixed to the base, the first slide rail, the second slide rail, the third slide rail and the fourth slide rail being respectively arranged at 90° equiangular distribution with the center of the base as the rotation axis;

[0010] a slide block set including a first slide block, a second slide block, a third slide block and a fourth slide block, the first slide block, the second slide block, the third slide block and the fourth slide block being respectively slidably connected to the first slide rail, the second slide rail, the third slide rail and the fourth slide rail;

[0011] The push rod group comprises 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 table, the bearing table is used for bearing a downward load, and the other end of each push rod is respectively pivotally connected to each sliding block;

[0012] The chuck group comprises a first chuck, a second chuck, a third chuck and a fourth chuck; 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;

[0013] The second chuck is indirectly connected to the second push rod through a second speed limiting device, and the second push rod transmits the tensile load of the second push rod to the second chuck through the second speed limiting device;

[0014] The third chuck is connected to the third sliding block and moves synchronously with the third sliding block;

[0015] The fourth chuck is connected to the fourth sliding block and moves synchronously with the fourth sliding block;

[0016] The tensile loads applied by the first chuck, the second chuck, the third chuck and the fourth chuck to the solid propellant are different.

[0017] Optionally, the first speed limiting device comprises:

[0018] A first sliding table slidably mounted on the first sliding rail; the first chuck is connected to the first sliding table;

[0019] A first support rod fixed to the first sliding table, the first support rod has a first clamping groove in the vertical direction thereof; the first push rod is provided with a first sliding groove in the extending direction thereof;

[0020] A first pin shaft sequentially arranged in the first clamping groove and the first sliding groove, so that the first push rod applies the tensile load to the first support rod through the first pin shaft to drive the first support rod to move the first sliding table and promote the first chuck to move.

[0021] Optionally, the second speed limiting device comprises: a second sliding table slidably mounted on the second sliding rail; the second chuck is connected to the second sliding table;

[0022] A second support rod fixed to the second sliding table, the second support rod has a second clamping groove in the vertical direction thereof; the second push rod is provided with a second sliding groove in the extending direction thereof;

[0023] A second pin shaft is sequentially arranged in 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, to drive the second support rod to move the second sliding table and move the second chuck.

[0024] Optionally, the first sliding rail is perpendicular to the third sliding rail, the second sliding rail is perpendicular to the fourth sliding rail, and the first sliding rail is collinear with the second sliding rail.

[0025] Optionally, the first chuck and the second chuck have the same moving speed, and the third chuck and the fourth chuck have the same moving speed.

[0026] Optionally, the third chuck and the third sliding block are connected through a first connecting rod, and the length of the first connecting rod is adjustable.

[0027] Optionally, the fourth chuck and the fourth sliding block are connected through a second connecting rod, and the length of the second connecting rod is adjustable.

[0028] In the biaxial stretching device for material tensile experiment provided by the embodiment of the present application, the moving speed of the first chuck and the second chuck is limited by the first speed limiting device and the second speed limiting device respectively, so that the moving speed of the first chuck and the second chuck is different from the moving speed of the third chuck and the fourth chuck, that is, four different tensile loads can be applied to the solid propellant from four directions, thereby meeting the requirements of tensile test. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 The structural schematic diagram of the biaxial stretching device for material tensile experiment provided by an embodiment of the present application.

[0031] Figure 2 The detailed structural schematic diagram of the first push rod, the first support rod and the first pin shaft provided by an embodiment of the present application.

[0032] Icon: 1-base; 2-solid propellant; 31-first slide rail; 32-second slide rail; 33-third slide rail; 34-fourth slide rail; 41-first sliding block; 42-second sliding block; 43-third sliding block; 44-fourth sliding block; 51-first push rod; 511-first sliding groove; 5111-first stop notch; 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 sliding table; 72-first supporting rod; 721-first clamping groove; 73-first pin shaft; 731-first rotating handle; 732-first clamping table; 8-second speed limiting device; 81-second sliding table; 82-second supporting rod; 83-second pin shaft; 91-first connecting rod; 92-second connecting rod; 10-bearing table. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work fall within the scope of protection of the present application.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0037] Furthermore, the terms "horizontal", "vertical", and the like, are used as terms of convenience and are not intended to be limiting, such that a component can be slightly tilted. For example, "horizontal" merely means more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but can be slightly tilted.

[0038] In the description of the present application, it also needs to be explained that, unless specifically defined and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] As Figure 1 and Figure 2 The embodiment provides a biaxial stretching device for material tensile experiment, which comprises a base 1, a solid propellant 2, a slide rail set, a slide block set, a push rod set, a chuck set, a first speed limiting device 7 and a second speed limiting device 8.

[0040] In the embodiment, the base 1 is in a rectangular plate structure, so as to provide a supporting effect.

[0041] The solid propellant 2 is arranged on the base 1, and the base 1 is used for bearing the solid propellant 2.

[0042] In the embodiment, the solid propellant 2 has plastic deformation capacity. The biaxial stretching device for material tensile experiment is used for applying tensile load to the solid propellant 2 from different directions.

[0043] The slide rail set comprises a first slide rail 31, a second slide rail 32, a third slide rail 33 and a fourth slide rail 34, and the slide rail set 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 arranged at an equal angle of 90° around the center of the base 1 as a rotating shaft, and the solid propellant 2 is located at the central position of the slide rail set.

[0044] The slide block set comprises a first slide block 41, a second slide block 42, a third slide block 43 and a fourth slide block 44, and the first slide block 41, the second slide block 42, the third slide block 43 and the fourth slide block 44 are respectively connected to the first slide rail 31, the second slide rail 32, the third slide rail 33 and the fourth slide rail 34 in a sliding mode.

[0045] The above slide rails are designed to pass through the slide blocks, so that the slide blocks can be effectively prevented from being separated from the slide rails when moving on the slide rails.

[0046] The push rod set 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 table 10, which is used to bear the downward load, and the other end of each push rod is pivotally connected to each sliding block.

[0047] The bearing table 10 is in a cross-shaped structure, and the top end of the push rod set is specifically hinged together. When the bearing table 10 bears the downward load, the downward load can be transmitted to the push rod set connected thereto.

[0048] The chuck set 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.

[0049] The second chuck 62 is indirectly connected to the second push rod 52 through the second speed limiting device 8, and the second push rod 52 transmits the tensile load of the second push rod 52 to the second chuck 62 through the second speed limiting device 8.

[0050] The third chuck 63 is connected to the third sliding block 43 and moves synchronously with the third sliding block 43.

[0051] Specifically, in this embodiment, the third chuck 63 and the third sliding block 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 chuck 63 and the third sliding block 43 is defined by adjusting the length of the first connecting rod 91.

[0052] The fourth chuck 64 is connected to the fourth sliding block 44 and moves synchronously with the fourth sliding block 44.

[0053] Specifically, in this embodiment, the fourth chuck 64 and the fourth sliding block 44 are connected together through the second connecting rod 92. The length of the second connecting rod 92 is adjustable, and the distance between the fourth chuck 64 and the fourth sliding block 44 is defined by adjusting the length of the second connecting rod 92.

[0054] The tensile loads applied by the first chuck 61, the second chuck 62, the third chuck 63, and the fourth chuck 64 to the solid propellant 2 are not completely the same.

[0055] Specifically, in this embodiment, the first speed limiting device 7 includes:

[0056] The first sliding table 71 is slidably mounted on the first sliding rail 31. The first chuck 61 is connected to the first sliding table 71.

[0057] The first support rod 72 is fixed to the first sliding table 71, and has a first clamping slot 721 along its vertical direction. The first push rod 51 is provided with a first sliding slot 511 along its extending direction.

[0058] The first pin shaft 73 is sequentially arranged in the first clamping slot 721 and the first sliding slot 511, so that the first push rod 51 applies a tensile load to the first support rod 72 through the first pin shaft 73, to drive the first support rod 72 to move the first sliding table 71 and promote the movement of the first chuck 61.

[0059] Specifically, in the present embodiment, the second speed limiting device 8 comprises:

[0060] The second sliding table 81 is slidingly installed on the second sliding rail 32. The second chuck 62 is connected to the second sliding table 81.

[0061] The second support rod 82 is fixed to the second sliding table 81, and has a second clamping slot along its vertical direction. The second push rod 52 is provided with a second sliding slot along its extending direction.

[0062] The second pin shaft 83 is sequentially arranged in the second clamping slot and the second sliding slot, so that the second push rod 52 applies a tensile load to the second support rod 82 through the second pin shaft 83, to drive the second support rod 82 to move the second sliding table 81 and promote the movement of the second chuck 62.

[0063] As described above, in the present embodiment, the movement speed of the first chuck 61 and the second chuck 62 is limited by the first speed limiting device 7 and the second speed limiting device 8 respectively, so that the movement speed of the first chuck 61 and the second chuck 62 is different from the movement speed of the third chuck 63 and the fourth chuck 64, that is, four different tensile loads can be applied to the solid propellant 2 from four directions to meet the requirements of tensile test.

[0064] Further, as Figure 2 In order to realize the different speed limiting effects of the first speed limiting device 7, in the present embodiment, the first sliding slot 511 of the first push rod 51 has a plurality of first stop notches 5111 along the extending direction of the first sliding slot 511.

[0065] One end of the first pin shaft 73 has a first rotating handle 731, and a first clamping table 732 is formed on the body of the first pin shaft 73. When the first pin shaft 73 is sequentially arranged in the first clamping groove 721 and the first sliding groove 511, the first clamping table 732 is clamped into the first stop 5111 at different positions by selection, thereby realizing the rotating connection of the first push rod 51 and the first support rod 72 at different positions. The first pin shaft 73 substantially plays a role of "hinge" for the rotating connection of the first push rod 51 and the first support rod 72. By selecting the first clamping table 732 to be clamped into the first stop 5111 at different positions, the distance between the first support rod 72 and the first sliding block 41 can be adjusted. When the first push rod 51 is pressed again to move the first sliding block 41, the moving speed of the first support rod 72 can be changed, and the moving speed of the first chuck 61 can be changed, so that the first chuck 61 can apply different tensile loads to the solid propellant 2. In other words, by selecting the first clamping table 732 to be clamped into the first stop 5111 at different positions, the "gear shifting" effect of the moving speed of the first chuck 61 is realized.

[0066] Similarly, the second support rod 82, the first support rod 72, the second pin shaft 83 and the first pin shaft 73, the second push rod 52 and the first push rod 51 adopt the same structure configuration and have the same operating principle, and belong to a symmetrical structure. Therefore, the "gear shifting" effect of the moving speed of the second chuck 62 can be realized. In this way, the second chuck 62 can also apply different tensile loads to the solid propellant 2.

[0067] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A biaxial tensile apparatus for material tensile testing, characterized in that, include: Base; A solid propellant is disposed on the base, the base being used to support the solid propellant; The slide rail assembly includes a first slide rail, a second slide rail, a third slide rail, and a fourth slide rail. The slide rail assembly is fixed on the base. The first slide rail, the second slide rail, the third slide rail, and the fourth slide rail are respectively distributed at 90° angles around the center of the base as the axis of rotation. A slider assembly includes 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; The push rod assembly includes 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 support platform, which is used to bear the downward pressure load, and the other end of each push rod is pivotally connected to each of the sliders; The chuck assembly includes 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 its tensile load 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 its tensile load 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; Among them, the first chuck, the second chuck, the third chuck, and the fourth chuck apply different tensile loads to the solid propellant; The first speed limiting device includes: A first slide table is 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 table has a first slot along its vertical direction; the first push rod has a first groove along its extending direction. The first pin passes through the first slot and the first slide groove in sequence, so that the first push rod applies tensile load to the first support rod through the first pin, thereby driving the first support rod to move the first slide table and causing the first chuck to move.

2. The biaxial tensile apparatus for material tensile testing according to claim 1, characterized in that, The second speed limiting device includes: A second slide table is slidably mounted on the second slide rail; the second clamp is connected to the second slide table; A second support rod is fixed to the second slide table, and the second support rod has a second slot along its vertical direction; the second push rod has a second slide groove along its extending direction. The second pin passes through the second slot and the second slide groove in sequence, so that the second push rod applies tensile load to the second support rod through the second pin, thereby driving the second support rod to move the second slide table and causing the second chuck to move.

3. The biaxial tensile apparatus for material tensile testing 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.

4. The biaxial tensile apparatus for material tensile testing according to claim 1, characterized in that, The first chuck and the second chuck move at the same speed; the third chuck and the fourth chuck move at the same speed.

5. The biaxial tensile apparatus for material tensile testing according to claim 1, characterized in that, The third clamp and the third slider are connected by a first connecting rod, the length of which is adjustable.

6. The biaxial tensile apparatus for material tensile testing according to claim 1, characterized in that, The fourth clamp and the fourth slider are connected together by a second connecting rod, the length of which is adjustable.

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