An experimental device for variable-ratio biaxial stretching of materials

Abstract

The present invention provides an experimental device for variable-proportion biaxial stretching of materials, which relates to the field of load test benches and includes: a base; for placing solid propellant; a plurality of slide rails fixed on the base and radially arranged around the solid propellant; a plurality of sliders, respectively slidably connected to the respective slide rails; a plurality of push rods, the top end of each push rod is movably connected to a bearing platform, the bearing platform is used to bear a downward load, and the other end of each push rod is pivotally connected to each slider; a plurality of stretching components, each stretching component has a chuck, and each chuck is used to clamp the solid propellant from different directions; at least one speed-changing gear set, the speed-changing gear set is arranged between the slider and the stretching component, and the speed-changing gear set is configured to change the moving speed of the slider on the slide rail, and then transmit the moving speed after the change to the chuck, so that the moving speed of the chuck is different from the moving speed of the slider.

Description

Technical Field

[0001] The invention relates to the field of load test benches, in particular to an experimental device for variable-proportion biaxial stretching of materials. Background Art

[0002] Solid propellant is a solid fuel compound used in aerospace vehicles such as rockets and missiles. It is generally composed of several substances, including fuel, oxidizer, and plasticizer. The main advantages of solid propellant are its small size, light weight, simple structure, and reliable operation. It can generate tremendous thrust in a very short time, and is therefore often used for rapid takeoff or acceleration during missions.

[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 tensile specimens, key indicators such as strength, ductility, and fracture properties of solid propellant materials can be evaluated.

[0004] Current solid propellant tensile test benches typically use a uniform tensile load method to perform tensile tests on solid propellants, making it difficult to fully and comprehensively test the mechanical properties of solid propellants. A test bench that can apply non-uniform tensile loads to solid propellants is urgently needed to address this issue. Summary of the Invention

[0005] The object of the present invention is to provide an experimental device for variable-ratio biaxial stretching of materials, which can realize applying expected tensile loads to a solid stretching agent from different directions.

[0006] The present invention provides an experimental device for variable-ratio biaxial stretching of materials, comprising:

[0007] a base for placing solid propellant;

[0008] a plurality of slide rails fixed on the base and arranged radially around the solid propellant;

[0009] A plurality of sliders, respectively slidably connected to the slide rails;

[0010] A plurality of push rods, 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 pivotally connected to each slider;

[0011] A plurality of stretching assemblies, each of the stretching assemblies having a clamp, each of the clamps being used to clamp the solid propellant from different directions;

[0012] At least one speed-changing gear set is provided between the slider and the stretching assembly, and the speed-changing gear set is configured to change the moving speed of the slider on the slide rail and then transmit the changed moving speed to the chuck, so that the moving speed of the chuck is different from the moving speed of the slider.

[0013] Optionally, the number of the slide rails is four, namely the first slide rail, the second slide rail, the third slide rail and the fourth slide rail; the number of the sliders is four, namely the first slider, the second slider, the third slider and the fourth slider.

[0014] Optionally, 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 in a one-to-one correspondence;

[0015] The stretching assembly includes a first stretching assembly, the first stretching assembly has a first clamp, the first stretching assembly includes a first sub-slide rail and a first sub-slider, the first sub-slide rail is fixed to the base, the first sub-slider is slidably mounted on the first sub-slide rail, and the first clamp of the first stretching assembly is fixedly connected to the first sub-slider; the first stretching assembly also includes a second rack and a third rack fixedly connected to the first sub-slider, and a first rack connected to the first slider;

[0016] The first speed-changing gear set is provided between the first sub-slider and the first slider, and is connected to the first sub-slider and the first slider respectively; the first speed-changing gear set includes:

[0017] The input shaft is fixedly connected to the first gear, the second gear and the third gear outside the input shaft from bottom to top;

[0018] A first output shaft, fixedly connected from bottom to top to a fourth gear outside the first output shaft, a fifth gear movably sleeved on the outside of the first output shaft, and a sixth gear movably sleeved on the outside of the first output shaft, wherein a seventh gear is provided between the fifth and sixth gears, the seventh gear being fixedly connected to the outside of the first output shaft, and a first shift engagement sleeve sleeved on the outside of the seventh gear, the first shift engagement sleeve being movable up and down to engage with the fifth gear or the sixth gear; and

[0019] The second output shaft is fixedly connected to the eighth gear outside the second output shaft from bottom to top, the ninth gear is movably sleeved on the outside of the second output shaft, and the tenth gear is movably sleeved on the outside of the second output shaft, wherein an eleventh gear is further disposed between the ninth gear and the tenth gear, the eleventh gear being fixedly connected to the outside of the second output shaft, and a second shift engagement sleeve is sleeved on the outside of the eleventh gear, the second shift engagement sleeve being movable up and down to engage with the ninth gear or the tenth gear;

[0020] The fifth gear, the sixth gear, the ninth gear and the tenth gear are all double gears for shifting;

[0021] The first speed change gear set may further include a power input gear, a first power output gear, and a second power output gear;

[0022] wherein the power input gear is meshed with the first rack and the first gear respectively;

[0023] The first power output gear is respectively engaged with the second rack and the fourth gear;

[0024] The second power output gear is respectively engaged with the third rack and the eighth gear;

[0025] Wherein, in the first speed change gear set, the second gear is meshed with the fifth gear and the ninth gear respectively;

[0026] The third gear is meshed with the sixth gear and the tenth gear, respectively.

[0027] Optionally, the first shift engagement sleeve is connected to a first shift lever.

[0028] Optionally, the second shift engagement sleeve is connected to a second shift lever.

[0029] Optionally, the number of the speed-changing gear sets matches the number of the stretching components.

[0030] Optionally, a first thrust ball bearing is provided between the fourth gear and the fifth gear; and a second thrust ball bearing is provided between the sixth gear and the seventh gear.

[0031] Optionally, a third thrust ball bearing is provided between the eighth gear and the ninth gear; and a fourth thrust ball bearing is provided between the tenth gear and the eleventh gear.

[0032] The present invention provides an experimental device for variable-ratio biaxial stretching of materials. After the speed of the first slider is changed by the first speed-changing gear set, the speed of the first sub-slider can be made different from the speed of the first slider. Since the first chuck of the first stretching assembly moves synchronously with the first sub-slider, the speed of the first chuck can also be different from the speed of the first slider. In this way, the tensile load applied to the solid propellant by the first chuck can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic structural diagram of an experimental device for variable-ratio biaxial stretching of materials provided in one embodiment of the present invention;

[0035] Figure 2 A schematic structural diagram of a speed change gear set at a first angle provided by an embodiment of the present invention;

[0036] Figure 3 This is a schematic structural diagram of a speed change gear set provided by an embodiment of the present invention with the shift sleeve removed;

[0037] Figure 4 A schematic structural diagram of a speed change gear set at a second angle provided by an embodiment of the present invention;

[0038] Figure 5 A cross-sectional view at a first angle of a speed change gear set provided by an embodiment of the present invention (wherein components such as the shift sleeve are removed, primarily to illustrate the coordination between the gears and between the gears and the rotating shaft);

[0039] Figure 6 A schematic structural diagram of an experimental device for variable-ratio biaxial stretching of materials provided in another embodiment of the present invention.

[0040] Icons: 1-power input gear; 101-first push rod; 102-second push rod; 103-third push rod; 104-fourth push rod; 21-first gear; 22-second gear; 23-third gear; 24-input shaft; 31-fourth gear; 32-fifth gear; 33-sixth gear; 34-first output shaft; 35-first shift engagement sleeve; 37-seventh gear; 38-first shift lever; 5-first power output gear; 6-second power output gear; 7-solid propellant; 81-first slide rail; 82-second slide rail; 83-third slide rail; 84-fourth slide rail; 91-first slider; 92-second slider; 93-third slider; 94-fourth slider; 100-first speed gear set; 200- Second speed gear set; 38-first shift lever; 330-supporting platform; 220-base; 820-first sub-slide rail; 100-first speed gear set; 51-first stretching assembly; 52-second stretching assembly; 53-third stretching assembly; 54-fourth stretching assembly; 810-first sub-slider; 811-second rack; 812-third rack; 501-first chuck; 41-eighth gear; 42-ninth gear; 43-tenth gear; 44-second output shaft; 45-second shift engagement sleeve; 47-eleventh gear; 48-second shift lever; 911-first rack; 391-first thrust ball bearing; 392-second thrust ball bearing; 491-third thrust ball bearing; 492-fourth thrust ball bearing. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only 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 herein can be arranged and designed in various different configurations.

[0042] 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 as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0043] 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, it does not need to be further defined or explained in subsequent drawings.

[0044] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0046] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] Please refer to Figures 1 to 4 This embodiment provides an experimental device for variable-proportion biaxial stretching of materials, which includes: a base 220, a solid propellant 7, four slide rails, four sliders, four push rods, a supporting platform 330, four stretching components and two speed-changing gear sets.

[0048] In this embodiment, the base 220 is substantially in the form of a rectangular plate structure to provide support. The base 7 is used to place the solid propellant 7 .

[0049] The solid propellant 7 is placed on the base 220. The solid propellant 7 has plastic deformation capability. The experimental device for material variable ratio biaxial stretching provided in this embodiment is used to apply tensile loads to the solid propellant 7 from different directions.

[0050] Four slide rails are fixed on the base 220. Specifically, the four slide rails are a first slide rail 81, a second slide rail 82, a third slide rail 83 and a fourth slide rail 84. The first slide rail 81, the second slide rail 82, the third slide rail 83 and the fourth slide rail 84 are respectively distributed at 90° equal angles with the center of the base 220 as the rotation axis, and the solid propellant 7 is located in the center of the four slide rails.

[0051] The four sliding blocks are slidably connected to the slide rails respectively.

[0052] Specifically, the four sliders are a first slider 91, a second slider 92, a third slider 93, and a fourth slider 94. The first slider 91, the second slider 92, the third slider 93, and the fourth slider 94 can be sequentially sleeved on the first slide rail 81, the second slide rail 82, the third slide rail 83, and the fourth slide rail 84. For example, each slide rail is passed through the slider. This design can effectively prevent the slider from detaching from the slide rail when moving from the slide rail.

[0053] The top ends of the four push rods are movably connected to the bearing platform 330, and the bearing platform 330 is used to bear the downward pressure load. The other ends of the four push rods are pivotally connected to the four sliders respectively.

[0054] Specifically, the four push rods are a first push rod 101, a second push rod 102, a third push rod 103, and a fourth push rod 104. The bottom end of each push rod is pivotally connected to the four sliders. For example, the four sliders are hingedly connected to the bottom ends of the four push rods. The top end of each push rod is movably connected to a support platform 330, which is used to withstand downward pressure. The support platform 330 has a cross-shaped structure and is hingedly connected to the top ends of the four push rods.

[0055] When the support platform 330 is subjected to a downward pressure load, the downward pressure load can be transferred to the four push rods connected thereto, and then transferred to the four sliders, thereby driving the four sliders to move along the four slide rails in a direction away from the solid propellant 7.

[0056] In this embodiment, the four stretching assemblies are a first stretching assembly 51 , a second stretching assembly 52 , a third stretching assembly 53 , and a fourth stretching assembly 54 .

[0057] The first stretching assembly 51 , the second stretching assembly 52 , the third stretching assembly 53 , and the fourth stretching assembly 54 all have clamps for clamping the solid propellant 7 . For example, the first stretching assembly 51 has a first clamp 501 , and the structures of the clamps may be the same.

[0058] The third stretching assembly 53 and the fourth stretching assembly 54 are directly connected to the third slider 93 and the fourth slider 94, respectively. In other words, the third stretching assembly 53 and the fourth stretching assembly 54 move synchronously with the movement of the third slider 93 and the fourth slider 94. Thus, the stretching force applied by the third stretching assembly 53 and the fourth stretching assembly 54 to the solid propellant 7 is determined by the movement speed of the third slider 93 and the fourth slider 94.

[0059] The first stretching assembly 51 and the second stretching assembly 52 are not directly connected to the first slider 91 and the second slider 92 , but are indirectly connected to the first slider 91 and the second slider 92 via the first speed gear set 100 and the second speed gear set 200 respectively.

[0060] In this embodiment, the first stretching assembly 51 and the second stretching assembly 52 have the same structure and configuration, and the first speed gear set 100 and the second speed gear set 200 have the same structure and configuration. Here, only the first stretching assembly 51 and the first speed gear set 100 are used as an example for description.

[0061] In this embodiment, the first stretching component 51 includes: a first sub-slide rail 820 and a first sub-slider 810, the first sub-slide rail 820 is fixed on the base 220, the first sub-slider 810 is slidably installed on the first sub-slide rail 820, and the first clamp 501 of the first stretching component 51 is fixedly connected to the first sub-slider 810, that is, the first clamp 501 can move synchronously with the first sub-slider 810.

[0062] The first stretching assembly 51 further includes a second rack 811 and a third rack 812 fixedly connected to the first sub-slider 810 .

[0063] The first stretching assembly 51 further includes a first rack 911 connected to the first sliding block 91 .

[0064] The first speed-changing gear set 100 is disposed between the first sub-slider 810 and the first slider 91 , and is connected to the first sub-slider 810 and the first slider 91 , respectively.

[0065] The first speed-changing gear set 100 is used to change the moving speed of the first slider 91 on the first slide rail 81 and then transfer it to the first sub-slider 810, and then transfer it to the first clamp 501 of the first stretching assembly 51, so that the moving speed of the first clamp 501 is different from the moving speed of the first slider 91, so that the first clamp 501 of the first stretching assembly 51 applies a tensile load to the solid propellant 7 after the speed is changed by the first speed-changing gear set 100.

[0066] Specifically, the first speed change gear set 100 includes:

[0067] The input shaft 24 is fixedly connected from bottom to top to the first gear 21, the second gear 22 and the third gear 23 outside the input shaft 24. The first gear 21, the second gear 22 and the third gear 23 can be fixedly connected to the input shaft 24 by a key and a keyway.

[0068] The first output shaft 34 is fixedly connected to the fourth gear 31 outside the first output shaft 34 from bottom to top, and is movably sleeved on the outside of the first output shaft 34 (the fifth gear 32 is a double gear for shifting, and figuratively speaking, the fifth gear 32 is "suspended" on the first output shaft 34). The sixth gear 33 is movably sleeved on the outside of the first output shaft 34 (the sixth gear 33 is a double gear for shifting, and figuratively speaking, the sixth gear 33 is "suspended" on the first output shaft 34). A seventh gear 37 is provided between the fifth gear 32 and the sixth gear 33. The seventh gear 37 is fixedly connected to the outside of the first output shaft 34, and a first shift engagement sleeve 35 is sleeved on the outside of the seventh gear 37. The first shift engagement sleeve 35 can move up and down to engage with the fifth gear 32 or the sixth gear 33, thereby realizing the shifting operation.

[0069] The second output shaft 44 is fixedly connected to the eighth gear 41 outside the second output shaft 44 from bottom to top, and is movably sleeved on the outside of the second output shaft 44 (the ninth gear 42 is a double gear for shifting. Figuratively speaking, the ninth gear 42 is "suspended" on the second output shaft 44). The tenth gear 43 is movably sleeved on the outside of the second output shaft 44 (the tenth gear 43 is a double gear for shifting. Figuratively speaking, the tenth gear 43 is "suspended" on the second output shaft 44). An eleventh gear 47 is provided between the ninth gear 42 and the tenth gear 43. The eleventh gear 47 is fixedly connected to the outside of the second output shaft 44, and a second shift engagement sleeve 45 is sleeved on the outside of the eleventh gear 47. The second shift engagement sleeve 45 can move up and down and engage with the ninth gear 42 or the tenth gear 43, thereby realizing the shifting operation.

[0070] The first speed-changing gear set 100 may further include a power input gear 1, a first power output gear 5, and a second power output gear 6. The power input gear 1 is meshed with the first rack 911 and the first gear 21, respectively; the first power output gear 5 is meshed with the second rack 811 and the fourth gear 31, respectively; and the second power output gear 6 is meshed with the third rack 812 and the eighth gear 41, respectively.

[0071] In the first speed change gear set 100 , the second gear 22 is meshed with the fifth gear 32 and the ninth gear 42 respectively; and the third gear 23 is meshed with the sixth gear 33 and the tenth gear 43 respectively.

[0072] As described above, since the fifth gear 32, the sixth gear 33, the ninth gear 42, and the tenth gear 43 are all double gears for shifting, the path of the gear transmission torque can be adjusted by adjusting the engagement of the first shift engagement sleeve 35 with the fifth gear 32 or the sixth gear 33, and adjusting the engagement of the second shift engagement sleeve 45 with the ninth gear 42 or the tenth gear 43. In this way, the speed of movement of the first slider 91 can be made different from the speed of movement of the first sub-slider 810 after the speed shifting action of the first speed gear set 100. Since the first clamp 501 of the first tensile assembly 51 moves synchronously with the first sub-slider 810, the moving speed of the first clamp 501 can also be different from the speed of movement of the first slider 91, so that the tensile load applied to the solid propellant 7 by the first clamp 501 can be adjusted.

[0073] In this embodiment, a first speed-changing gear set 100 is provided between the first slider 91 and the first stretching assembly 51, and the first speed-changing gear set 100 is used to change the moving speed of the first slider 91 on the first slide rail 81 and then transmit it to the first clamp 501 of the first stretching assembly 51. Therefore, the first clamp 501 can apply the expected first stretching load to the solid propellant 7.

[0074] It should be emphasized that, in this embodiment, since the first tensile assembly 51 and the second tensile assembly 52 are configured in the same manner, and the first speed gear set 100 and the second speed gear set 200 are configured in the same manner, the second tensile assembly 52 can apply a desired second tensile load to the solid propellant 7, and this second tensile load can be different from the first tensile load mentioned above. In other words, in this embodiment, the tensile load of the solid propellant 7 can be adjusted only in the direction toward the first tensile assembly 51 and the second tensile assembly 52. ​​However, it should be noted that, although Figure 1 The third and fourth stretching assemblies 53 and 54 are shown as directly stretching the solid propellant 7. However, it is understood that, depending on the requirements of the tensile test, speed-changing gear sets can also be added to the third and fourth stretching assemblies 53 and 54, respectively, so that the tensile loads applied to the solid propellant 7 in all four directions can be adjusted. In this way, customized configuration of the tensile loads applied to the solid propellant 7 in all four directions can be achieved. For example, four different tensile loads can be applied to the solid propellant in four directions to meet the requirements of the tensile test.

[0075] like Figure 5 , Figure 5 This is a cross-sectional view at a first angle of a speed change gear set provided by an embodiment of the present invention, wherein components such as a shift sleeve are removed, mainly to illustrate the matching relationship between the various gears and the matching relationship between the various gears and the rotating shaft.

[0076] The fourth gear 31 and the seventh gear 37 can be fixedly connected to the first output shaft 34 via keys, respectively. It should be understood that the seventh gear 37 can also be integrally formed with the first output shaft 34.

[0077] The first gear 21 , the second gear 22 , and the third gear 23 can be fixedly connected to the input shaft 24 via keys, respectively.

[0078] The eighth gear 41 and the eleventh gear 47 can be fixedly connected to the second output shaft 44 via keys, respectively. It should be understood that the eleventh gear 47 can also be integrally formed with the second output shaft 44.

[0079] In addition, in this embodiment, in order to facilitate the up and down movement of the first shift engagement sleeve 35 and the second shift engagement sleeve 45 to achieve the shifting operation, the first shift engagement sleeve 35 and the second shift engagement sleeve 45 are also connected to the first shift lever 38 and the second shift lever 48, respectively. The operator only needs to manually shift the first shift engagement sleeve 35 up and down, or manually shift the second shift engagement sleeve 45 up and down, thereby quickly and conveniently achieving the shifting operation.

[0080] What you need to know is that Figure 2 As shown, when the operator manually moves the first shift lever 38 to move the first shift engagement sleeve 35 up and down, and adjusts the first shift engagement sleeve 35 to engage with the fifth gear 32 or the sixth gear 33, it is necessary to

[0081] Adjusting the second shift sleeve 45 so that it is not meshed with either the ninth gear 42 or the tenth gear 43 is, figuratively speaking, controlling the second shift sleeve 45 to be in "neutral." Correspondingly, when the operator manually moves the second shift lever 48 up and down to adjust the second shift sleeve 45 to mesh with either the ninth gear 42 or the tenth gear 43, it is necessary to adjust the first shift sleeve 35 so that it is not meshed with either the fifth gear 32 or the sixth gear 33. Figuratively speaking, controlling the first shift sleeve 35 to be in "neutral" is, in this way, adjusting the path of torque transmission through the gears as needed.

[0082] Figure 6 This is a schematic diagram of the structure of an experimental device for variable ratio biaxial stretching of materials provided by another embodiment of the present invention. Figure 6 The experimental equipment for material variable ratio biaxial stretching provided in this embodiment is Figure 1 Most of the structures of the experimental equipment for variable ratio biaxial stretching of materials shown are the same, and the same reference numerals are used for the same parts, which will not be repeated here. The differences are as follows:

[0083] A first thrust ball bearing 391 is provided between the fourth gear 31 and the fifth gear 32. The first thrust ball bearing 391 is used to position the fifth gear 32 so that the fifth gear 32 always maintains a fixed distance relative to the fourth gear 31 in the vertical direction without affecting the rotation of the fifth gear 32.

[0084] A second thrust ball bearing 392 is provided between the sixth gear 33 and the seventh gear 37. The second thrust ball bearing 392 is used to position the sixth gear 33 so that the sixth gear 33 always maintains a fixed distance relative to the seventh gear 37 in the vertical direction without affecting the rotation of the sixth gear 33.

[0085] A third thrust ball bearing 491 is provided between the eighth gear 41 and the ninth gear 42. The third thrust ball bearing 491 is used to position the ninth gear 42 so that the ninth gear 42 always maintains a fixed distance relative to the eighth gear 41 in the vertical direction without affecting the rotation of the ninth gear 42.

[0086] A fourth thrust ball bearing 492 is provided between the tenth gear 43 and the eleventh gear 47. The fourth thrust ball bearing 492 is used to position the tenth gear 43 so that the tenth gear 43 always maintains a fixed distance relative to the eleventh gear 47 in the vertical direction without affecting the rotation of the tenth gear 43.

[0087] As described above, by adding the first thrust ball bearing 391, the second thrust ball bearing 392, the third thrust ball bearing 491, and the fourth thrust ball bearing 492, the first speed-changing gear set 100 can be made more structurally reliable and more stable in operation. It will be appreciated that in addition to thrust ball bearings, other thrust bearings, such as thrust cylindrical roller bearings, can also be used to achieve substantially the same effect.

[0088] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An experimental device for variable ratio biaxial stretching of materials, characterized in that: include: a base for placing solid propellant; a plurality of slide rails fixed on the base and arranged radially around the solid propellant; A plurality of sliders, respectively slidably connected to the slide rails; A plurality of push rods, 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 pivotally connected to each slider; A plurality of stretching assemblies, each of the stretching assemblies having a clamp, each of the clamps being used to clamp the solid propellant from different directions; at least one speed-changing gear set, the speed-changing gear set being disposed between the slider and the stretching assembly, the speed-changing gear set being configured to change the moving speed of the slider on the slide rail and then transmit the changed moving speed to the chuck, so that the moving speed of the chuck is different from the moving speed of the slider; The speed change gear set includes a first speed change gear set, which is arranged between the first sub-slider and the first slider, and respectively connects the first sub-slider and the first slider; the first speed change gear set includes: The input shaft is fixedly connected to the first gear, the second gear and the third gear outside the input shaft from bottom to top; A first output shaft, fixedly connected from bottom to top to a fourth gear outside the first output shaft, a fifth gear movably sleeved on the outside of the first output shaft, and a sixth gear movably sleeved on the outside of the first output shaft, wherein a seventh gear is provided between the fifth and sixth gears, the seventh gear being fixedly connected to the outside of the first output shaft, and a first shift engagement sleeve sleeved on the outside of the seventh gear, the first shift engagement sleeve being movable up and down to engage with the fifth gear or the sixth gear; and The second output shaft is fixedly connected to the eighth gear outside the second output shaft from bottom to top, the ninth gear is movably sleeved on the outside of the second output shaft, and the tenth gear is movably sleeved on the outside of the second output shaft, wherein an eleventh gear is further disposed between the ninth gear and the tenth gear, the eleventh gear being fixedly connected to the outside of the second output shaft, and a second shift engagement sleeve is sleeved on the outside of the eleventh gear, the second shift engagement sleeve being movable up and down to engage with the ninth gear or the tenth gear; The fifth gear, the sixth gear, the ninth gear and the tenth gear are all double gears for shifting.

2. The experimental equipment for variable ratio biaxial stretching of materials according to claim 1, characterized in that: There are four slide rails, namely a first slide rail, a second slide rail, a third slide rail and a fourth slide rail; there are four sliders, namely a first slider, a second slider, a third slider and a fourth slider.

3. The experimental equipment for variable ratio biaxial stretching of materials according to claim 2, characterized in that: 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 in a one-to-one correspondence; The stretching assembly includes a first stretching assembly, the first stretching assembly has a first clamp, the first stretching assembly includes a first sub-slide rail and a first sub-slider, the first sub-slide rail is fixed to the base, the first sub-slider is slidably mounted on the first sub-slide rail, and the first clamp of the first stretching assembly is fixedly connected to the first sub-slider; the first stretching assembly also includes a second rack and a third rack fixedly connected to the first sub-slider, and a first rack connected to the first slider; The first speed change gear set may further include a power input gear, a first power output gear, and a second power output gear; wherein the power input gear is meshed with the first rack and the first gear respectively; The first power output gear is respectively engaged with the second rack and the fourth gear; The second power output gear is respectively engaged with the third rack and the eighth gear; Wherein, in the first speed change gear set, the second gear is meshed with the fifth gear and the ninth gear respectively; The third gear is meshed with the sixth gear and the tenth gear, respectively.

4. The experimental equipment for variable ratio biaxial stretching of materials according to claim 3, characterized in that: The first shift engagement sleeve is connected to a first shift lever.

5. The experimental equipment for variable ratio biaxial stretching of materials according to claim 3, characterized in that: The second shift engagement sleeve is connected to a second shift lever.

6. The experimental equipment for variable ratio biaxial stretching of materials according to claim 3, characterized in that: The number of the speed change gear sets is adapted to the number of the stretching components.

7. The experimental equipment for variable ratio biaxial stretching of materials according to claim 3, characterized in that: A first thrust ball bearing is provided between the fourth gear and the fifth gear; and a second thrust ball bearing is provided between the sixth gear and the seventh gear.

8. The experimental equipment for variable ratio biaxial stretching of materials according to claim 3, characterized in that: A third thrust ball bearing is provided between the eighth gear and the ninth gear; and a fourth thrust ball bearing is provided between the tenth gear and the eleventh gear.

Images