Experimental equipment for variable-proportion biaxial stretching of material

Abstract

The invention provides experimental equipment for variable-proportion biaxial stretching of a material, and relates to the field of load test stands. The box body is used for placing solid propellants; 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; and the speed change gear set is arranged between the sliding block and the stretching assembly, and the speed change gear set is configured to transmit the moving speed after speed change to the chuck after the moving speed of the sliding block on the sliding rail is subjected to speed change operation, so that the moving speed of the chuck is different from that of the sliding block.

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 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 for rapid takeoff or acceleration in 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 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 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: a base for placing solid propellants; A plurality of slide rails, fixed on the base and arranged radially around the solid propellant; A plurality of sliding blocks, respectively slidably connected to the respective slide rails; A plurality of push rods, each of which has a top end movably connected to a bearing platform, the bearing platform being used to bear a downward pressure load, and the other end of each of the push rods being pivotally connected to each of the sliders; A plurality of stretching components, each of which has a clamp, and each of the clamps is used to clamp the solid propellant from different directions; At least one speed change gear set is arranged between the slider and the stretching assembly, and the speed change 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.

[0007] Optionally, the number of the slide rails is four, namely, a first slide rail, a second slide rail, a third slide rail and a fourth slide rail; the number of the sliders is four, namely, a first slider, a second slider, a third slider and a fourth slider.

[0008] 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; 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 is disposed 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 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, a fourth gear fixedly connected to the outside of the first output shaft from bottom to top, a fifth gear movably sleeved on the outside of the first output shaft, a sixth gear movably sleeved on the outside of the first output shaft, wherein a seventh gear is further provided between the fifth gear and the sixth gear, 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 able to move up and down and meshing 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 also provided between the ninth gear and the tenth gear, the eleventh gear is 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, and the second shift engagement sleeve can move up and down and mesh 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; 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 meshed with the second rack and the fourth gear; The second power output gear is respectively meshed with the third rack and the eighth gear; Wherein, in the first speed 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.

[0009] Optionally, the first shift engagement sleeve is connected to a first shift lever.

[0010] Optionally, the second shift engagement sleeve is connected to a second shift lever.

[0011] Optionally, the number of the speed change gear sets matches the number of the stretching components.

[0012] 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.

[0013] 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.

[0014] The present invention provides an experimental device for variable-ratio biaxial stretching of materials. After the speed of the first slider moves through the speed-changing action of 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 component moves synchronously with the first sub-slider, the speed of the first chuck can also be different from the speed of the first slider, thereby achieving the adjustment of the tensile load applied to the solid propellant by the first chuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 A schematic diagram of the structure of an experimental device for variable ratio biaxial stretching of materials provided in one embodiment of the present invention; Figure 2 A schematic diagram of the structure of a speed change gear set at a first angle provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a speed change gear set provided by an embodiment of the present invention with the shift sleeve removed; Figure 4A schematic diagram of the structure of a speed change gear set at a second angle provided by an embodiment of the present invention; Figure 5 A cross-sectional view of a speed change gear set provided by an embodiment of the present invention at a first angle (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); Figure 6 A schematic diagram of the structure of an experimental device for variable-ratio biaxial stretching of materials provided in another embodiment of the present invention.

[0017] 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- The second speed gear set; 38-the first shift lever; 330-the support platform; 220-the base; 820-the first sub-slide rail; 100-the first speed gear set; 51-the first stretching assembly; 52-the second stretching assembly; 53-the third stretching assembly; 54-the fourth stretching assembly; 810-the first sub-slider; 811-the second rack; 812-the third rack; 501-the first chuck; 41-the eighth gear; 42-the ninth gear; 43-the tenth gear; 44-the second output shaft; 45-the second shift engagement sleeve; 47-the eleventh gear; 48-the second shift lever; 911-the first rack; 391-the first thrust ball bearing; 392-the second thrust ball bearing; 491-the third thrust ball bearing; 492-the fourth thrust ball bearing. 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] Please refer to Figures 1 to 4 The present embodiment provides an experimental device for variable ratio biaxial stretching of materials, which includes: a base 220, a solid propellant 7, four slide rails, four sliders, four push rods, a bearing platform 330, four stretching components and two speed change gear sets.

[0025] 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 .

[0026] The solid propellant 7 is placed on the base 220, and 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.

[0027] 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 at the center of the four slide rails.

[0028] The four sliding blocks are slidably connected to the sliding rails respectively.

[0029] Specifically, the four sliders are the first slider 91, the second slider 92, the third slider 93 and the fourth slider 94. The first slider 91, the second slider 92, the third slider 93 and the fourth slider 94 can be sleeved on the first slide rail 81, the second slide rail 82, the third slide rail 83 and the fourth slide rail 84 in sequence, for example, each slide rail is passed through by the slider, and such a design can effectively prevent the slider from being separated from the slide rail when moving from the slide rail.

[0030] 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 respectively pivotally connected to four sliding blocks.

[0031] Specifically, the four push rods are respectively 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 respectively pivoted to the four sliders. For example, the four sliders are specifically hinged to the bottom ends of the four push rods. The top end of each push rod is movably connected to the bearing platform 330, and the bearing platform 330 is used to bear the downward pressure load. The bearing platform 330 is a cross-shaped structure, and the bearing platform 330 is specifically hinged to the top ends of the four push rods.

[0032] When the support platform 330 is subjected to a downward pressure load, the downward pressure load can be transmitted to four push rods connected thereto, and then transmitted to four sliders, thereby driving the four sliders to move along four slide rails in a direction away from the solid propellant 7 .

[0033] In this embodiment, the four stretching components are a first stretching component 51 , a second stretching component 52 , a third stretching component 53 , and a fourth stretching component 54 .

[0034] The first stretching assembly 51 , the second stretching assembly 52 , the third stretching assembly 53 , and the fourth stretching assembly 54 all have a clamp for clamping the solid propellant 7 . For example, the first stretching assembly 51 has a first clamp 501 , and the structures of the various clamps may be the same.

[0035] 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. That is, 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, so that the stretching force applied to the solid propellant 7 by the third stretching assembly 53 and the fourth stretching assembly 54 is determined by the moving speed of the third slider 93 and the fourth slider 94.

[0036] 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 through the first speed gear set 100 and the second speed gear set 200 respectively.

[0037] 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.

[0038] 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.

[0039] The first stretching assembly 51 further includes a second rack 811 and a third rack 812 fixedly connected to the first sub-slider 810 .

[0040] The first stretching assembly 51 further includes a first rack 911 connected to the first sliding block 91 .

[0041] The first speed change 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.

[0042] The first speed change gear set 100 is used to transfer the moving speed of the first slider 91 on the first slide rail 81 to the first sub-slider 810 after changing the speed, 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 change gear set 100.

[0043] In detail, the first speed change gear set 100 specifically includes: 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 in the form of a key and a keyway.

[0044] The first output shaft 34 is fixedly connected to the fourth gear 31 outside the first output shaft 34 from bottom to top, the fifth gear 32 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), and 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), wherein 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 gear shift engagement sleeve 35 is sleeved on the outside of the seventh gear 37, and the first gear shift engagement sleeve 35 can move up and down to engage with the fifth gear 32 or the sixth gear 33, thereby realizing a gear shift operation.

[0045] 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 ninth gear 42 outside the second output shaft 44 (the ninth gear 42 is a double gear for shifting, and figuratively speaking, the ninth gear 42 is "suspended" on the second output shaft 44), and is movably sleeved on the tenth gear 43 outside the second output shaft 44 (the tenth gear 43 is a double gear for shifting, and 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 to engage with the ninth gear 42 or the tenth gear 43, thereby realizing the shifting operation.

[0046] The first speed change 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 respectively meshed with the first rack 911 and the first gear 21; the first power output gear 5 is respectively meshed with the second rack 811 and the fourth gear 31; the second power output gear 6 is respectively meshed with the third rack 812 and the eighth gear 41.

[0047] In the first speed gear set 100 , the second gear 22 is meshed with the fifth gear 32 and the ninth gear 42 respectively; the third gear 23 is meshed with the sixth gear 33 and the tenth gear 43 respectively.

[0048] 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 first shift engagement sleeve 35 to mesh with the fifth gear 32 or the sixth gear 33, and adjusting the second shift engagement sleeve 45 to mesh with the ninth gear 42 or the tenth gear 43. In this way, the moving speed of the first slider 91 can be different from the moving speed of the first sub-slider 810 after the speed change action of the first speed gear set 100. Since the first chuck 501 of the first tensile assembly 51 moves synchronously with the first sub-slider 810, the moving speed of the first chuck 501 can also be different from the moving speed of the first slider 91, so that the tensile load applied to the solid propellant 7 by the first chuck 501 can be adjusted.

[0049] In this embodiment, since the first speed change gear set 100 is provided between the first slider 91 and the first stretching assembly 51, and the first speed change 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, the first clamp 501 can apply the expected first stretching load to the solid propellant 7.

[0050] It should be emphasized that, in this embodiment, since the first stretching assembly 51 and the second stretching 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 stretching assembly 52 can apply the expected second stretching load to the solid propellant 7, and the second stretching load can be different from the above-mentioned first stretching load. That is to say, in this embodiment, the tensile load of the solid propellant 7 can be adjusted only in the direction toward the first stretching assembly 51 and the second stretching assembly 52. ​​However, it should be noted that although Figure 1 It is shown that the third stretching assembly 53 and the fourth stretching assembly 54 directly stretch the solid propellant 7, but it can be understood that according to the requirements of the stretching test, a speed change gear set can be added to the third stretching assembly 53 and the fourth stretching assembly 54 respectively, so that the tensile loads in the four directions of the solid propellant 7 can be adjusted. In this way, customized configuration of the tensile loads applied to the solid propellant 7 in the four directions can be achieved. For example, four different tensile loads can be applied to the solid propellant from four directions to meet the requirements of the tensile test.

[0051] 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.

[0052] The fourth gear 31 and the seventh gear 37 can be fixedly connected to the first output shaft 34 through keys, respectively. It should be understood that the seventh gear 37 can also be integrally formed with the first output shaft 34.

[0053] 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.

[0054] The eighth gear 41 and the eleventh gear 47 can be fixedly connected to the second output shaft 44 through keys, respectively. It should be understood that the eleventh gear 47 can also be integrally formed with the second output shaft 44.

[0055] In addition, in the present embodiment, in order to facilitate the up and down movement of the first gear shift engagement sleeve 35 and the second gear shift engagement sleeve 45 to realize the gear shifting operation, the first gear shift engagement sleeve 35 and the second gear shift engagement sleeve 45 are also respectively connected to the first gear shift lever 38 and the second gear shift lever 48. The operator only needs to manually shift the first gear shift lever 38 to move the first gear shift engagement sleeve 35 up and down, or manually shift the second gear shift lever 48 to move the second gear shift engagement sleeve 45 up and down, thereby realizing the gear shifting operation quickly and conveniently.

[0056] It is important to understand 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 to adjust the first shift engagement sleeve 35 to mesh with the fifth gear 32 or the sixth gear 33, it is necessary to The second gear shift engagement sleeve 45 is adjusted so that it does not mesh with the ninth gear 42 or the tenth gear 43. Figuratively speaking, the second gear shift engagement sleeve 45 is controlled to be in a "neutral state". Correspondingly, when the operator manually moves the second gear shift lever 48 to move the second gear shift engagement sleeve 45 up and down and adjusts the second gear shift engagement sleeve 45 to mesh with the ninth gear 42 or the tenth gear 43, the first gear shift engagement sleeve 35 needs to be adjusted so that it does not mesh with the fifth gear 32 or the sixth gear 33. Figuratively speaking, the first gear shift engagement sleeve 35 is controlled to be in a "neutral state". In this way, the path of the gear transmission torque can be adjusted as needed.

[0057] 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: 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.

[0058] 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.

[0059] 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.

[0060] A fourth thrust ball bearing 492 is disposed 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.

[0061] 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 structure of the first speed change gear set 100 can be made more reliable and the operation can be made more stable. It can be understood that in addition to the thrust ball bearing, thrust bearings such as thrust cylindrical roller bearings can also be used to achieve basically the same effect.

[0062] 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. An experimental device for variable ratio biaxial stretching of materials, characterized in that: include: a base for placing solid propellants; A plurality of slide rails, fixed on the base and arranged radially around the solid propellant; A plurality of sliding blocks, respectively slidably connected to the respective slide rails; A plurality of push rods, each of which has a top end movably connected to a bearing platform, the bearing platform being used to bear a downward pressure load, and the other end of each of the push rods being pivotally connected to each of the sliders; A plurality of stretching components, each of which has a clamp, and each of the clamps is used to clamp the solid propellant from different directions; At least one speed change gear set is arranged between the slider and the stretching assembly, and the speed change 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.

2. The experimental equipment for variable ratio biaxial stretching of materials according to claim 1, characterized in that: 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.

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 speed change gear set includes a first speed change gear set, which is disposed 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, a fourth gear fixedly connected to the outside of the first output shaft from bottom to top, a fifth gear movably sleeved on the outside of the first output shaft, a sixth gear movably sleeved on the outside of the first output shaft, wherein a seventh gear is further provided between the fifth gear and the sixth gear, 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 able to move up and down and meshing 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 also provided between the ninth gear and the tenth gear, the eleventh gear is 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, and the second shift engagement sleeve can move up and down and mesh 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; 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 meshed with the second rack and the fourth gear; The second power output gear is respectively meshed with the third rack and the eighth gear; Wherein, in the first speed 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 matches 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.

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