Free fall test bench
By designing a free-fall test bench including a guide part, a placement part, a barrier part and a replacement part, the problem of subjective human factors affecting the test results in the prior art is solved, and more accurate and reliable test data are achieved, and students' understanding effect is enhanced.
Patent Information
- Application Number
- CN202421304542.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-08
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-08
AI Technical Summary
The existing free fall test methods are susceptible to subjective factors in the human body, resulting in deviations in the test results, and inaccurate operation may lead to students' misunderstanding of free fall movement.
A free-fall test bench is designed, including a guide part, a placement part, a barrier part and a replacement part. Through the mutual cooperation of these components, the impact of human factors on the test results is reduced and more accurate and reliable test data is achieved.
It effectively reduces the impact of subjective factors on the test results, improves the accuracy and reliability of the test, and enhances students' understanding of the principles and laws of free fall motion.
Smart Images
Figure CN222749091U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of physical test equipment, in particular to a free fall test bench. Background Art
[0002] In physics experiment teaching, experimental teaching aids can assist teachers in conducting experimental demonstrations, provide intuitive visual effects, and help students better understand complex physical phenomena and principles. With the assistance of teaching aids, teachers can demonstrate the experimental process more vividly and accurately, avoiding abstract and difficult-to-understand problems that may arise from relying solely on theoretical explanations. At the same time, students can also deepen their understanding of physical concepts and cultivate basic scientific experimental skills by personally operating experimental teaching aids.
[0003] Although there are many physics teaching aids on the market, teaching aids specifically used to demonstrate free fall are relatively scarce. Free fall is a basic concept in physics, and its experiment is usually used to prove that objects of different masses will fall with the same acceleration when only subject to gravity. However, most schools' free fall experiments are still conducted by teachers or students holding two spheres of different weights. This method is not only easily affected by human subjective factors, resulting in deviations in test results, but also may cause students to misunderstand free fall due to inaccurate operations.
[0004] Therefore, there is an urgent need for a free fall test bench that can reduce the impact of human factors on the test sphere. Utility Model Content
[0005] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of the utility model is to provide a free fall test bench.
[0006] In order to solve the above technical problems, the utility model provides a free fall test bench, including: a guiding part; a placing part, which is installed on the guiding part, a guiding through hole is opened at one end of the placing part, a blocking groove is opened at the other end of the placing part, and a first through hole group is opened on the placing part, and a first replacement groove is opened in the first through hole group; a blocking part, which is at least partially inserted into the blocking groove, the blocking part is opened with a second through hole group, and a second replacement groove is opened in the second through hole group; a replacement part, which is respectively installed in the first replacement groove and the second replacement groove, and is opened with a test through hole.
[0007] As a preferred embodiment of the present application, the guide portion includes: at least one guide member; at least one scale member, wherein the scale member is installed on one side of the guide member and the scale member is provided with scale markings.
[0008] As a preferred embodiment of the present application, the guide member is provided with a first fastening hole, and a plurality of first fastening holes are arranged in an array along the height direction of the guide member; the placement portion is provided with a second fastening hole, and the placement portion is fixed to a preset height of the guide member by a fastener passing through the second fastening hole and the first fastening hole.
[0009] As a preferred embodiment of the present application, the placing portion is installed on the guide member through a guiding through hole, and the placing portion moves along the guiding direction of the guide member.
[0010] As a preferred embodiment of the present application, the first through hole group includes: a first mounting hole; a second mounting hole; wherein a first replacement groove is provided in the first mounting hole and the second mounting hole.
[0011] As a preferred embodiment of the present application, the second through hole group includes: a third mounting hole; a fourth mounting hole; wherein a second replacement groove is provided in the third mounting hole and the fourth mounting hole.
[0012] As a preferred embodiment of the present application, the replacement part includes: a first replacement part, which is respectively installed in the first mounting hole and the third mounting hole, and the first replacement part is provided with a first test through hole; a second replacement part, which is respectively installed in the second mounting hole and the fourth mounting hole, and the second replacement part is provided with a second test through hole; wherein the aperture size of the first test through hole is the same as or different from that of the second test through hole.
[0013] As a preferred embodiment of the present application, when the aperture sizes of the first test through hole and the second test through hole are different, the spatial size of the first test through hole is larger than that of the second test through hole, or the spatial size of the first test through hole is smaller than that of the second test through hole.
[0014] As a preferred embodiment of the present application, it further includes: at least one limiting member installed at one end of the placing portion where the blocking groove is provided, for providing movement limiting for the blocking portion.
[0015] As a preferred embodiment of the present application, it also includes: a base, which is provided with a drop groove; wherein the guide part is installed on the base, and the guiding direction of the guide part is perpendicular to the plane where the base is located; the plane where the base is located is parallel to the plane where the placement part is located.
[0016] The above technical solution of the utility model has the following advantages compared with the prior art:
[0017] 1. It can reduce the influence of human subjective factors on the test results during the test. Traditional free fall tests are often performed by teachers holding balls of different weights. Due to the subjectivity of hand control, deviations in the test results are likely to occur. This application reduces the influence of human factors on the test results through the mutual cooperation of multiple components.
[0018] 2. The replacement part of the utility model is flexibly designed and can be adjusted and replaced according to different test requirements, so that the test device has high adaptability and versatility; during the test, the object can be subjected to a free fall test in a controllable manner through the coordinated action of the guiding part, the placing part and the blocking part, thereby obtaining more accurate and reliable test data.
[0019] 3. Through intuitive experimental demonstrations, students can better understand the principles and laws of free fall motion, enhance learning effects and interest in scientific exploration. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0021] Figure 1 It is a first stereoscopic schematic diagram of the free fall test bench provided in an embodiment of the utility model.
[0022] Figure 2 It is a top view schematic diagram of the free fall test bench provided in the embodiment of the utility model.
[0023] Figure 3 It is a second stereoscopic schematic diagram of the free fall test bench provided in the embodiment of the utility model.
[0024] Figure 4 It is a front view schematic diagram of the free fall test bench provided in the embodiment of the utility model.
[0025] Figure 5 It is a third stereoscopic schematic diagram of the free fall test bench provided in the embodiment of the utility model.
[0026] Figure 6 It is a first top view schematic diagram of the placement portion and the blocking portion provided in an embodiment of the utility model.
[0027] Figure 7 It is an exploded schematic diagram of the placement portion and the blocking portion provided in an embodiment of the utility model.
[0028] Figure 8It is a three-dimensional schematic diagram of the placement portion and the blocking portion provided in an embodiment of the utility model.
[0029] Fig. 9 It is a first moving schematic diagram of the placing portion and the blocking portion provided in an embodiment of the utility model.
[0030] Fig.10 It is a second movement schematic diagram of the placement portion and the blocking portion provided in the embodiment of the utility model.
[0031] Fig.11 It is a fourth stereoscopic schematic diagram of the free fall test bench provided in an embodiment of the utility model.
[0032] Fig.12 It is an enlarged schematic diagram of the A area provided in the embodiment of the utility model.
[0033] Fig.13 This is a third movement schematic diagram of the placement portion and the blocking portion provided in the embodiment of the utility model.
[0034] Fig.14 This is a fourth movement schematic diagram of the placement portion and the blocking portion provided in the embodiment of the utility model.
[0035] Fig.15 It is a second top view schematic diagram of the placement portion and the blocking portion provided in the embodiment of the utility model. DETAILED DESCRIPTION
[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0037] refer to Figure 1 As shown, in some embodiments, the free fall test platform 1 is at least composed of a base 10 , a guide portion 11 , a placement portion 12 , a blocking portion 13 and a replacement portion 14 .
[0038] <Base 10>
[0039] refer to Figure 2 As shown, a drop groove 100 is provided on the base 10, and the drop groove 100 is used to accommodate the free-fall test object; the base 10 is provided with an anti-skid pad, and the anti-skid pad is arranged on the side of each supporting foot of the base 10 that contacts the ground, and the anti-skid pad is used to increase friction; wherein, the specific design style and size of the base 10 are selected by the installer according to actual needs.
[0040] In some embodiments, reference Figure 3As shown, the base 10 is also provided with moving rollers 101, which are arranged on the side of each supporting foot of the base 10 that contacts the ground. Several moving rollers 101 drive the base 10 to move, and then drive the free fall test platform 1 to move through the base 10, thereby increasing the transportation efficiency of the free fall test platform 1.
[0041] <Guide 11>
[0042] refer to Figure 4 As shown, the guide portion 11 is installed on the base 10, and the guiding direction of the guide portion 11 is perpendicular to the plane where the base 10 is located; wherein, the specific length, width or diameter and height of the guide portion 11 are selected by the installer according to actual needs.
[0043] In some embodiments, reference Figure 5 As shown, the guide portion 11 includes a guide member 110 and a scale member 112, which are respectively installed on the base 10, and the height direction of the guide member 110 is perpendicular to the plane where the base 10 is located, and the height direction of the scale member 112 is perpendicular to the plane where the base 10 is located.
[0044] Specifically, the guide member 110 is provided with at least one end, one end of which is at least partially inserted into the base 10, and the guide member 110 is fixedly connected to the base 10; the guide member 110 is also provided with a first fastening hole 111, and a plurality of first fastening holes 111 are arranged in an array along the height direction of the guide member 110 at equal intervals or at intervals set by the installer; for example, the guide member 110 of the present application can refer to Figure 4 As shown, a first round rod 110-1 and a second round rod 110-2 are used, and a plurality of first fastening holes 111 are opened on the first round rod 110-1 and the second round rod 110-2. Figure 4 The illustration is only for illustration, and during actual installation, the installer may select other quantities and styles of guide members 110 according to actual needs.
[0045] Specifically, at least one scale member 112 is provided, one end of which is at least partially inserted into the base 10, and the scale member 112 is fixedly connected to the base 10; the scale member 112 is provided with a scale mark 113 to display the height dimension for easy viewing by the test personnel; for example, the scale member 112 of the present application can refer to Figure 5 As shown, it is installed in the middle position of the first round rod 110-1 and the second round rod 110-2 mentioned in the present application. Figure 5 The illustration is only for illustration, and during actual installation, the installer may select other quantities and styles of scale pieces 112 according to actual needs.
[0046] <Placing section 12>
[0047] refer to Figure 5 , Figure 6 As shown, a guide through hole 120 is provided at one end of the placing portion 12, and the placing portion 12 is installed on the guiding portion 11 through the guide through hole 120, and then the placing portion 12 moves along the guiding direction of the guiding portion 11 through the guide through hole 120. After the placing portion 12 is installed on the guiding portion 11, the plane where the placing portion 12 is located is parallel to the plane where the base 10 is located; a blocking groove 121 is provided at the other end of the placing portion 12, wherein the placing portion 12 is also provided with a first through hole group, and a first replacement groove 123 is provided in the first through hole group.
[0048] Specifically, refer to Figure 5 , Figure 6 As shown, a guide hole 120 is provided at one end of the placing portion 12. When the placing portion 12 is installed, the guide member 110 is passed through the guide hole 120 of the placing portion 12, so that the placing portion 12 moves along the height direction of the guide member 110, so as to adjust the height of the free fall test; and, a second fastening hole 124 is also provided at one end of the placing portion 12 where the guide hole 120 is provided. After the height of the placing portion 12 is adjusted, an appropriate fastener 20 (such as a stud or bolt) is selected and passed through the second fastening hole 124 of the placing portion 12 and the first fastening hole 111 of the guide member 110 in sequence, so as to fix the placing portion 12.
[0049] Specifically, refer to Figure 7 As shown, a blocking groove 121 is formed at the other end of the placement portion 12 , and the blocking groove 121 penetrates the first through hole group. The blocking groove 121 is used to accommodate the blocking portion 13 .
[0050] Specifically, refer to Figure 7 As shown, the first through hole group of the placement part 12 includes a first mounting hole 122-1 and a second mounting hole 122-2. The first mounting hole 122-1 and the second mounting hole 122-2 both penetrate the placement part 12, and the first mounting hole 122-1 and the second mounting hole 122-2 are each provided with a first replacement groove 123 for installing the replacement part 14.
[0051] <Blocking section 13>
[0052] refer to Figure 7 As shown, one end of the blocking portion 13 is at least partially inserted into the blocking groove 121, and a handle 132 is installed at the other end of the blocking portion 13, and the handle 132 is used to provide a tester with a way to move the blocking portion 13; and the blocking portion 13 is provided with a second through hole group, and a second replacement groove 131 is provided in the second through hole group.
[0053] Specifically, refer to Figure 7As shown, the second through hole group of the blocking portion 13 includes a third mounting hole 130-1 and a fourth mounting hole 130-2, the third mounting hole 130-1 and the fourth mounting hole 130-2 both penetrate the blocking portion 13, and the third mounting hole 130-1 and the fourth mounting hole 130-2 are each provided with a second replacement groove 131, and the second replacement groove 131 is used to install the replacement portion 14; Fig. 9 As shown, after the blocking portion 13 is inserted into the blocking groove 121, the third mounting hole 130-1 of the blocking portion 13 is not centered with the first mounting hole 122-1 of the placement portion 12, and the fourth mounting hole 130-2 of the blocking portion 13 is not centered with the second mounting hole 122-2 of the placement portion 12; Fig.10 As shown, after the blocking part 13 moves in the opposite direction of the guide member 110 by the distance set by the installer, the third mounting hole 130-1 of the blocking part 13 is coaxial with the first mounting hole 122-1 of the placing part 12, and the fourth mounting hole 130-2 of the blocking part 13 is coaxial with the second mounting hole 122-2 of the placing part 12.
[0054] <Replacement section 14>
[0055] refer to Figure 7 As shown, the replacement part 14 is placed in the first replacement groove 123 and the second replacement groove 131 respectively, and a test through hole is opened.
[0056] Specifically, refer to Figure 7 As shown, the replacement part 14 includes a first replacement part 140 and a second replacement part 142. The first replacement part 140 is respectively installed in the first mounting hole 122-1 and the third mounting hole 130-1. The first replacement part 140 is provided with a first test through hole 141, and the aperture sizes of the first test through hole 141 of the first replacement part 140 in the first mounting hole 122-1 and the third mounting hole 130-1 are the same; the second replacement part 142 is respectively installed in the second mounting hole 122-2 and the third mounting hole 130-1. The second replacement part 142 is provided with a second test through hole 143, and the aperture sizes of the test through holes of the second replacement part 142 in the second mounting hole 122-2 and the third mounting hole 130-1 are the same.
[0057] Furthermore, the aperture sizes of the first test through hole 141 and the second test through hole 143 may be the same or different, and the specific aperture size is selected by the test personnel according to actual test requirements.
[0058] Specifically, when the aperture sizes of the first test through hole 141 and the second test through hole 143 are different, the spatial size of the first test through hole 141 is larger than that of the second test through hole 143, or the spatial size of the first test through hole 141 is smaller than that of the second test through hole 143; and the aperture size of the first test through hole 141 is larger than the diameter size of the first free fall test object, and the aperture size of the second test through hole 143 is larger than the diameter size of the second free fall test object.
[0059] In some embodiments, the aperture size of the first test through hole 141 of the first replacement part 140 of the present application is equal to the aperture size of the second test through hole 143 of the second replacement part 142. Figure 6 As shown, the aperture sizes of the first test through hole a141 - 1 , the first test through hole b141 - 2 , the second test through hole a143 - 1 and the second test through hole b143 - 2 are all the same.
[0060] The diameters of the first free fall test object 21 and the second free fall test object 22 may be the same or different, and the diameters of the first free fall test object 21 and the second free fall test object 22 are smaller than the aperture size of the first test through hole a141 - 1 .
[0061] In some embodiments, the aperture size of the first test through hole 141 of the first replacement part 140 of the present application is larger than the aperture size of the second test through hole 143 of the second replacement part 142, so that Figure 7 As shown, the aperture size of the first test through hole a141-1 is the same as that of the first test through hole b141-2, the aperture size of the first test through hole a141-1 is larger than the aperture sizes of the second test through hole a143-1 and the second test through hole b143-2, and the aperture size of the second test through hole a143-1 is the same as that of the second test through hole b143-2.
[0062] The aperture size of the first test through hole a141 - 1 is larger than the diameter size of the first free fall test object 21 , and the aperture size of the second test through hole a143 - 1 is larger than the diameter size of the second free fall test object 22 .
[0063] In some embodiments, the aperture size of the first test through hole 141 of the first replacement part 140 of the present application is smaller than the aperture size of the second test through hole 143 of the second replacement part 142, so that Figure 8 As shown, the aperture size of the first test through hole a141-1 is the same as that of the first test through hole b141-2, the aperture size of the first test through hole a141-1 is smaller than that of the second test through hole a143-1 and the second test through hole b143-2, and the aperture size of the second test through hole a143-1 is the same as that of the second test through hole b143-2; wherein:
[0064] The aperture size of the first test through hole a141 - 1 is larger than the diameter size of the first free-fall test object 21 , and the aperture size of the second test through hole a143 - 1 is larger than the diameter size of the second free-fall test object 22 .
[0065] Therefore, the test process of the free fall test bench 1 of the present application is:
[0066] Move the free fall test bench 1 to the test area, and then adjust the height of the placing part 12 along the guide 110. After adjusting to the set height, use bolts to pass through the second mounting hole 122-2 of the placing part 12 and the first mounting hole 122-1 of the guide 110 to fix the placing part 12 at the height.
[0067] Select appropriate first replacement part 140 and second replacement part 142, and then install the first replacement part 140 in the first mounting hole 122-1 of the placing part 12 and the third mounting hole 130-1 of the blocking part 13 respectively, and install the second replacement part 142 in the second mounting hole 122-2 of the placing part 12 and the fourth mounting hole 130-2 of the blocking part 13 respectively.
[0068] Then, the barrier portion 13 is at least partially inserted into the barrier groove 121 of the placement portion 12. Fig. 9 As shown, the first mounting hole 122-1 and the third mounting hole 130-1 are not coaxial, and the second mounting hole 122-2 and the fourth mounting hole 130-2 are not coaxial; then the first free fall test object is placed on the first test through hole 141 of the first replacement part 140 of the placing part 12, and the second free fall test object is placed on the second test through hole 143 of the second replacement part 142 of the placing part 12.
[0069] After the free fall test object is placed, move the barrier 13, refer to Fig.10 As shown, until the first mounting hole 122-1 is coaxial with the third mounting hole 130-1, and the second mounting hole 122-2 is coaxial with the fourth mounting hole 130-2, at this time, the first free fall test object and the second free fall test object fall from the placement portion 12 at the same time, thereby completing the free fall test.
[0070] In some embodiments, reference Fig.11 As shown, the free fall test bench 1 provided in the present application further includes a limiting member 15 , which is installed on the placing portion 12 and is used to provide movement limiting for the blocking portion 13 .
[0071] Specifically, refer to Fig.11 , Fig.14 As shown, at least one limiting member 15 is installed at one end of the placing portion 12 where the blocking groove 121 is opened, and the movement of the blocking portion 13 is limited by the limiting member 15; that is, referring to Fig.13 As shown, after the blocking portion 13 is inserted into the blocking groove 121, the third mounting hole 130-1 of the blocking portion 13 is not centered with the first mounting hole 122-1 of the placement portion 12, and the fourth mounting hole 130-2 of the blocking portion 13 is not centered with the second mounting hole 122-2 of the placement portion 12; Fig.14 As shown, after the blocking part 13 moves in the opposite direction of the guide member 110 and contacts the limiting member 15, the third mounting hole 130-1 of the blocking part 13 is coaxial with the first mounting hole 122-1 of the placing part 12, and the fourth mounting hole 130-2 of the blocking part 13 is coaxial with the second mounting hole 122-2 of the placing part 12.
[0072] Therefore, the test process of the free fall test bench 1 of the present application is:
[0073] Move the free fall test bench 1 to the test area, and then adjust the height of the placing part 12 along the guide 110. After adjusting to the set height, use bolts to pass through the second mounting hole 122-2 of the placing part 12 and the first mounting hole 122-1 of the guide 110 to fix the placing part 12 at the height.
[0074] Select the appropriate first replacement part 140 and second replacement part 142, and then install the first replacement part 140 in the first mounting hole 122-1 of the placement part 12 and the third mounting hole 130-1 of the blocking part 13, and install the second replacement part 142 in the second mounting hole 122-2 of the placement part 12 and the fourth mounting hole 130-2 of the blocking part 13; then at least partially insert the blocking part 13 into the blocking groove 121 of the placement part 12. When the blocking part 13 is inserted, refer to Fig.13 As shown, the first mounting hole 122-1 and the third mounting hole 130-1 are not coaxial, and the second mounting hole 122-2 and the fourth mounting hole 130-2 are not coaxial; after the blocking part 13 is inserted, the limiting member 15 is installed or adjusted to the position as shown in FIG. Fig.13 Then place the first free fall test object on the first test through hole 141 of the first replacement member 140 of the placement portion 12, and place the second free fall test object on the second test through hole 143 of the second replacement member 142 of the placement portion 12. After the free fall test object is placed, move the barrier portion 13 to contact the stopper 15. Fig.14 and Fig.15 As shown, the first mounting hole 122-1 is coaxial with the third mounting hole 130-1, and the second mounting hole 122-2 is coaxial with the fourth mounting hole 130-2. At the same time, the first free fall test object and the second free fall test object fall from the placement portion 12 at the same time, thereby completing the free fall test.
[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0076] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
[0077] Description of reference numerals:
[0078] 1. Free fall test bench
[0079] 10. Base
[0080] 11. Guidance Department
[0081] 12. Placement Department
[0082] 13. Barrier
[0083] 14. Replacement Department
[0084] 15. Limiting parts
[0085] 20. Fasteners
[0086] 21. The first free fall test object
[0087] 22. The second free fall test object
[0088] 100. Drop Slot
[0089] 101. Mobile roller
[0090] 110. Guide
[0091] 111. First fastening hole
[0092] 112. Ruler parts
[0093] 113. Scale marking
[0094] 120. Guide vias
[0095] 121. Barrier groove
[0096] 123. First replacement slot
[0097] 124. Second fastening hole
[0098] 131. Second replacement slot
[0099] 132. Handle
[0100] 140. First replacement part
[0101] 141. First test through hole
[0102] 142. Second replacement part
[0103] 143. Second test through hole
[0104] 110-1, the first round bar
[0105] 110-2, Second round bar
[0106] 122-1, first mounting hole
[0107] 122-2, Second mounting hole
[0108] 130-1, the third mounting hole
[0109] 130-2, Fourth mounting hole
[0110] 141-1, first test through hole a
[0111] 141-2, first test through hole b
[0112] 143-1, Second test through hole a
[0113] 143-2. Second test through hole b.
Claims
1. A free fall test bench (1), characterized in that: include: A guide portion (11); A placement portion (12) is mounted on the guide portion (11), one end of the placement portion (12) is provided with a guide through hole (120), the other end of the placement portion (12) is provided with a blocking groove (121), and the placement portion (12) is provided with a first through hole group, and a first replacement groove (123) is provided in the first through hole group; A blocking portion (13), at least part of which is inserted into the blocking groove (121), the blocking portion (13) being provided with a second through hole group, and a second replacement groove (131) being provided in the second through hole group; The replacement part (14) is respectively installed in the first replacement groove (123) and the second replacement groove (131), and is provided with a test through hole.
2. A free fall test bench (1) according to claim 1, characterized in that: The guide portion (11) comprises: at least one guide member (110); At least one scale member (112), the scale member (112) is installed on one side of the guide member (110), and the scale member (112) is provided with a scale mark (113).
3. A free fall test bench (1) according to claim 2, characterized in that: The guide member (110) is provided with a first fastening hole (111), and a plurality of the first fastening holes (111) are arranged in an array along the height direction of the guide member (110); the placement portion (12) is provided with a second fastening hole (124), and the placement portion (12) is fixed to a preset height of the guide member (110) by a fastener passing through the second fastening hole (124) and the first fastening hole (111).
4. A free fall test bench (1) according to claim 2, characterized in that: The placement portion (12) is mounted on the guide member (110) through a guide through hole (120), and the placement portion (12) moves along a guide direction of the guide member (110).
5. A free fall test bench (1) according to claim 1, characterized in that: The first through hole group comprises: A first mounting hole (122-1); A second mounting hole (122-2); Wherein, a first replacement groove (123) is provided in the first mounting hole (122-1) and the second mounting hole (122-2).
6. A free fall test bench (1) according to claim 5, characterized in that: The second through hole group comprises: A third mounting hole (130-1); Fourth mounting hole (130-2); Wherein, a second replacement groove (131) is provided in the third mounting hole (130-1) and the fourth mounting hole (130-2).
7. A free fall test bench (1) according to claim 6, characterized in that: The replacement unit (14) comprises: A first replacement part (140) is installed in the first installation hole (122-1) and the third installation hole (130-1) respectively, and the first replacement part (140) is provided with a first test through hole (141); A second replacement part (142), which is installed in the second installation hole (122-2) and the fourth installation hole (130-2) respectively, and the second replacement part (142) is provided with a second test through hole (143); The aperture sizes of the first test through hole (141) and the second test through hole (143) are the same or different.
8. A free fall test bench (1) according to claim 7, characterized in that: When the aperture sizes of the first test through hole (141) and the second test through hole (143) are different, the spatial size of the first test through hole (141) is larger than that of the second test through hole (143), or the spatial size of the first test through hole (141) is smaller than that of the second test through hole (143).
9. A free fall test bench (1) according to claim 1, characterized in that: Also includes: At least one limiting member (15) is mounted on one end of the placement portion (12) where the blocking groove (121) is provided, and is used to provide movement limiting for the blocking portion (13).
10. A free fall test bench (1) according to claim 1, characterized in that: Also includes: A base (10) having a drop groove (100); The guide portion (11) is mounted on the base (10), and the guiding direction of the guide portion (11) is perpendicular to the plane where the base (10) is located; the plane where the base (10) is located is parallel to the plane where the placement portion (12) is located.