A new type of casing dynamic strength clamp

Abstract

The utility model provides a novel casing dynamic strength clamp, including clamp fixed plate, clamp initiative end, sliding component, clamp body, force assembly and positioner, clamp fixed plate horizontal fixed in test platform, and the upper surface of clamp fixed plate is installed with sliding component and clamp body, clamp initiative end passes through sliding component and is connected with clamp fixed plate sliding, and one end of clamp initiative end is connected with MTS output end, the clamp body is two, and is fixed on the upper surface of clamp fixed plate symmetrically, is used for fixed casing of waiting for detecting, force assembly is installed in the inside of clamp initiative end symmetrically, is used for transmission load to casing, positioner is assembled in the inside of clamp initiative end, is used for adjusting the position of force assembly to eliminate the clearance with casing. This clamp effectively solved the problem that the test error is big, the loading direction is unstable and other problems caused by the assembly clearance of traditional clamp, significantly improved the accuracy and reliability of casing dynamic strength test, has good adaptability simultaneously, can through positioner adaptation different specification casing's test demand, reduced the equipment cost and improved the operation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts testing technology, and more specifically, to a novel housing dynamic strength clamp. Background Technology

[0002] As the automotive industry places increasing demands on development cycles and product reliability, bench testing has become a core method for identifying strength risks in components in advance. In dynamic strength testing of shell-type components, the fixture must fulfill the core functions of "fixing the shell - transferring load - simulating working conditions," and its performance directly determines the validity of the test results.

[0003] The existing dynamic strength fixture for housings uses a "lateral contour block" design: a rigid contour block adapted to the housing cavity is inserted from the side and then connected to the MTS loading device. This solution has certain drawbacks: lateral assembly inevitably introduces a 0.1-0.5mm gap, causing relative impact between the fixture and the housing during dynamic loading. This leads to unstable load transfer, resulting in test errors exceeding 5%, making bench tests unable to accurately reflect the actual stress on the housing, potentially overlooking potential strength risks, and increasing rework costs and safety hazards during vehicle road testing. Therefore, there is an urgent need to design a new fixture that can eliminate gaps, simulate real-world conditions, and ensure loading accuracy to solve these problems. Utility Model Content

[0004] The present invention aims to solve the problem of errors in testing caused by assembly gaps in existing fixtures.

[0005] To address the aforementioned problems, this utility model provides a novel dynamic strength fixture for housings, comprising a fixture fixing plate, a fixture active end, a sliding assembly, a fixture body, a force-applying assembly, and an adjustment assembly. The fixture fixing plate is horizontally fixed to the test platform, and the sliding assembly and the fixture body are mounted on the upper surface of the fixture fixing plate. The fixture active end is slidably connected to the fixture fixing plate via the sliding assembly, and one end of the fixture active end is connected to the MTS output terminal. There are two fixture bodies, symmetrically fixed to the upper surface of the fixture fixing plate, used to fix the housing to be tested. The force-applying assembly is symmetrically installed inside the fixture active end, used to transfer the load to the housing. The adjustment assembly is assembled inside the fixture active end, used to adjust the position of the force-applying assembly to eliminate the gap with the housing.

[0006] The present invention provides a novel dynamic strength clamp for housings, which, compared with the prior art, has the following beneficial effects, but is not limited to: To address the issue of assembly gaps in existing fixtures leading to testing errors, this housing dynamic strength fixture is horizontally fixed to the test platform via a fixture fixing plate. A sliding assembly mounted on its upper surface enables a sliding connection between the active end of the fixture and the fixing plate, allowing the active end to stably transmit the load from the MTS output end. Two symmetrically distributed fixture bodies are used to precisely fix the housing under test. Force-applying components symmetrically installed inside the active end of the fixture are responsible for transmitting the load to the housing. An adjustment component mounted inside the active end can flexibly adjust the position of the force-applying component to eliminate gaps with the housing. Through the synergistic effect of its components, the overall structure effectively solves the problems of large testing errors and unstable loading direction caused by assembly gaps in traditional fixtures, significantly improving the accuracy and reliability of housing dynamic strength testing. It also possesses good adaptability, as the adjustment component can accommodate testing requirements for housings of different specifications, reducing equipment costs and improving operational efficiency.

[0007] Furthermore, the sliding assembly includes a guide rail and a slider; the guide rail is fixed to the upper surface of the fixture fixing plate by bolts; the slider is fixedly connected to the lower surface of the active end of the fixture, and the slider slides in cooperation with the guide rail.

[0008] Furthermore, the guide rail is a linear guide rail, and a dust cover is provided on the outside of the guide rail.

[0009] Furthermore, the force-applying component includes a base, a locking block, and a striking block; the base is fixedly installed on the inner wall of the active end of the clamp, and a sliding groove is provided on the side of the base facing the housing; the locking block has a trapezoidal structure and is movably embedded in the sliding groove of the base; the striking block is fixed on the side of the locking block facing the housing, and the surface of the striking block is adapted to the inner wall of the housing.

[0010] Furthermore, the impact block is made of nylon and is detachably connected to the locking block by bolts, making it easy to replace impact blocks of different sizes.

[0011] Furthermore, the clearance between the sliding groove for installing the locking block and the base is ≤0.05mm, and the surface roughness Ra of the inclined surface of the locking block is ≤1.6μm, ensuring that the locking block slides smoothly along the sliding groove.

[0012] Furthermore, the positioning component includes a bidirectional threaded shaft and a trapezoidal block; the bidirectional threaded shaft horizontally penetrates the side wall of the active end of the fixture, and the surface of the bidirectional threaded shaft is machined with a left-hand thread and a right-hand thread, and the pitch of the left-hand thread and the right-hand thread are the same; there are two trapezoidal blocks, which respectively engage with the left-hand thread and the right-hand thread of the bidirectional threaded shaft, and the side of the trapezoidal block is in contact with the inclined surface of the locking block of the force application component.

[0013] Furthermore, the positioning assembly also includes nuts; there are two nuts, which are threaded onto both ends of the bidirectional threaded shaft to lock the position of the bidirectional threaded shaft.

[0014] Furthermore, the inclined angle of the trapezoidal block is consistent with the inclined angle of the locking block, and the surface roughness Ra of the inclined surface of the trapezoidal block is ≤1.6μm. The length of the trapezoidal block is adapted to the inner width of the active end of the clamp to avoid the trapezoidal block from shifting during movement.

[0015] Furthermore, the top of the fixture body is provided with a positioning pin and bolt holes; the positioning pin is a cylindrical pin, used for quick centering of the housing; the distribution of the bolt holes is adapted to the mounting holes of the housing to be tested, ensuring that the housing is firmly fixed. Attached Figure Description

[0016] Figure 1 This is a first-view structural schematic diagram of the novel shell dynamic strength clamp according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the housing assembly state of the novel housing dynamic strength fixture according to an embodiment of the present utility model; Figure 3 This is a second-view structural schematic diagram of the novel shell dynamic strength clamp according to an embodiment of the present utility model; Figure 4 This is an exploded structural diagram of the novel shell dynamic strength clamp according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Fixture fixing plate; 2. Fixture driving end; 3. Sliding assembly; 31. Guide rail; 32. Slider; 4. Fixture body; 5. Force application assembly; 51. Base; 52. Locking block; 53. Impact block; 6. Positioning assembly; 61. Bidirectional threaded shaft; 62. Trapezoidal block; 63. Nut. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, in the attached diagram, the X-axis represents the vertical direction, that is, the front-to-back position, and the positive direction of the X-axis (that is, the direction the arrow points to) represents the front, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the back; in the attached diagram, the Y-axis represents the horizontal direction, that is, the left-to-right position, and the positive direction of the Y-axis (that is, the direction the arrow points to) represents the left, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the right; in the attached diagram, the Z-axis represents the vertical direction, that is, the up-to-down position, and the positive direction of the Z-axis (that is, the direction the arrow points to) represents the up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the down.

[0022] It should also be noted that the aforementioned X-axis, Y-axis and Z-axis are only for the purpose of facilitating the description of this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0025] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] See Figures 1-4 This utility model discloses a novel dynamic strength fixture for a housing, comprising a fixture fixing plate 1, a fixture active end 2, a sliding assembly 3, a fixture body 4, a force application assembly 5, and an adjustment assembly 6. The fixture fixing plate 1 is horizontally fixed to a test platform, and the sliding assembly 3 and the fixture body 4 are mounted on the upper surface of the fixture fixing plate 1. The fixture active end 2 is slidably connected to the fixture fixing plate 1 through the sliding assembly 3, and one end of the fixture active end 2 is connected to the output end of an MTS (electrodynamic fatigue testing machine). There are two fixture bodies 4, which are symmetrically fixed to the upper surface of the fixture fixing plate 1 for fixing the housing to be tested. The force application assembly 5 is symmetrically installed inside the fixture active end 2 for transmitting load to the housing. The adjustment assembly 6 is assembled inside the fixture active end 2 for adjusting the position of the force application assembly 5 to eliminate the gap with the housing.

[0027] In this embodiment, to address the problem of assembly gaps in existing fixtures leading to test errors, the dynamic strength fixture for the housing is horizontally fixed to the test platform via a fixture fixing plate 1. A sliding component 3 mounted on its upper surface enables a sliding connection between the active end 2 of the fixture and the fixing plate, allowing the active end to stably transmit the load from the output end of the MTS (Electrodynamic Fatigue Testing Machine). Two symmetrically distributed fixture bodies 4 are used to precisely fix the housing to be tested. Force-applying components 5, symmetrically installed inside the active end 2 of the fixture, are responsible for transmitting the load to the housing. An adjustment component 6, assembled within the active end, can flexibly adjust the position of the force-applying component 5 to eliminate gaps with the housing. Through the synergistic effect of each component, the overall structure effectively solves the problems of large test errors and unstable loading direction caused by assembly gaps in traditional fixtures, significantly improving the accuracy and reliability of the housing dynamic strength test. It also has good adaptability, allowing the adjustment component 6 to adapt to the testing needs of housings of different specifications, reducing equipment costs and improving operational efficiency.

[0028] Optional, please refer to Figure 1 and Figure 4 The sliding assembly 3 includes a guide rail 31 and a slider 32; the guide rail 31 is fixed to the upper surface of the clamp fixing plate 1 by bolts; the slider 32 is fixedly connected to the lower surface of the clamp active end 2, and the slider 32 and the guide rail 31 are in sliding cooperation.

[0029] In this embodiment, the sliding cooperation between the guide rail 31 and the slider 32 enables the precise movement of the active end 2 of the fixture along a fixed trajectory, thus solving the problem of disordered force transmission caused by the lack of guidance in traditional fixtures.

[0030] The guide rail 31 is fixed to the mounting groove on the surface of the fixture fixing plate 1 by countersunk bolts; the slider 32 is rigidly connected to the lower surface of the active end 2 of the fixture by bolts, and wear-resistant balls are embedded in the inner side of the slider 32 to ensure that there is no jamming during dynamic loading.

[0031] Optionally, the guide rail 31 is a linear guide rail 31, and a dust cover is provided on the outside of the guide rail 31.

[0032] In this embodiment, the high-precision guidance of the linear guide rail 31 further improves the stability of the loading direction, and the dust cover can isolate metal debris in the test environment and extend the service life of the sliding component 3.

[0033] Optional, please refer to Figure 3 and Figure 4 The force-applying component 5 includes a base 51, a locking block 52, and a striking block 53. The base 51 is fixedly installed on the inner side wall of the active end 2 of the clamp, and a sliding groove is provided on the side of the base 51 facing the housing. The locking block 52 has a trapezoidal structure and is movably embedded in the sliding groove of the base 51. The striking block 53 is fixed on the side of the locking block 52 facing the housing, and the surface of the striking block 53 is adapted to the inner wall of the housing.

[0034] In this embodiment, the trapezoidal locking block 52 cooperates with the sliding groove of the base 51 to realize the vertical transmission of load, and the fitting design of the impact block 53 with the inner wall of the shell ensures that the load is evenly distributed and avoids local stress concentration.

[0035] Optionally, the impact block 53 is made of nylon, and the impact block 53 is detachably connected to the locking block 52 by bolts, making it easy to replace impact blocks 53 of different sizes.

[0036] In this embodiment, the elastic properties of nylon material (elastic modulus 1.5 GPa) simulate the force feedback of the rubber limit block of the whole vehicle, reducing the risk of impact damage to the housing; the detachable structure makes the clamp adaptable to a variety of housings, improving versatility by 60%.

[0037] Optionally, the clearance between the sliding groove for mounting the locking block 52 and the base 51 is ≤0.05mm, and the surface roughness Ra of the inclined surface of the locking block 52 is ≤1.6μm, to ensure that the locking block 52 slides smoothly along the sliding groove.

[0038] In this embodiment, the fitting clearance of ≤0.05mm and the surface roughness of Ra≤1.6μm ensure that the locking block 52 slides smoothly (friction coefficient ≤0.15) without jamming or abnormal noise, making the locking block 52 slide better in the groove.

[0039] Optional, please refer to Figure 3 and Figure 4 The adjusting component 6 includes a bidirectional threaded shaft 61 and a trapezoidal block 62. The bidirectional threaded shaft 61 horizontally penetrates the side wall of the active end 2 of the clamp. The surface of the bidirectional threaded shaft 61 is machined with a left-hand thread and a right-hand thread, and the pitch of the left-hand thread and the right-hand thread are the same. There are two trapezoidal blocks 62, which respectively mate with the left-hand thread and the right-hand thread of the bidirectional threaded shaft 61. The side of the trapezoidal block 62 is in contact with the inclined surface of the locking block 52 of the force application component 5.

[0040] In this embodiment, the left-hand and right-hand thread design enables the trapezoidal block 62 to move synchronously in opposite directions. The locking block 52 is precisely pushed through the inclined plane transmission, and the gap between the impact block 53 and the housing is controlled to ≤0.05mm, eliminating the impact error of traditional clamps.

[0041] Optional, please refer to Figure 3 The adjusting component 6 also includes two nuts 63, which are threaded onto both ends of the bidirectional threaded shaft 61 to lock the position of the bidirectional threaded shaft 61.

[0042] In this embodiment, the double nuts 63, together with the spring washer, achieve rigid locking of the bidirectional threaded shaft 61, ensuring no loosening under vibration and maintaining gap stability during the test.

[0043] Optionally, the inclined surface angle of the trapezoidal block 62 is consistent with the inclined surface angle of the locking block 52, and the surface roughness Ra of the inclined surface of the trapezoidal block 62 is ≤1.6μm. The length of the trapezoidal block 62 is adapted to the inner width of the active end 2 of the clamp to avoid the trapezoidal block 62 from shifting during movement.

[0044] In this embodiment, the consistent bevel angle and high-precision surface roughness (Ra≤1.6μm) ensure a tight fit between the two, and the matching of the length of the trapezoidal block 62 with the inner width of the active end 2 of the fixture avoids movement deviation and improves the stability of gap adjustment.

[0045] Optionally, the top of the fixture body 4 is provided with a positioning pin and bolt holes; the positioning pin is a cylindrical pin, used for quick centering of the housing; the distribution of the bolt holes is adapted to the mounting holes of the housing to be tested, ensuring that the housing is firmly fixed.

[0046] In this embodiment, the cylindrical locating pin enables rapid centering of the housing, and the appropriate bolt hole distribution ensures that the housing is firmly fixed, improving clamping efficiency by 50%. The locating pin has a diameter of 8mm (tolerance 0-0.019mm) and is surface-carburized (hardness HRC58-62); the bolt holes are M10 threads (accuracy 6H), and the positional error between the bolt holes and the housing mounting holes is ≤0.1mm. Grade 8.8 bolts are used for fixing.

[0047] Although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A novel shell dynamic strength clamp, characterized in that, The device includes a fixture fixing plate (1), a fixture active end (2), a sliding assembly (3), a fixture body (4), a force application assembly (5), and an adjustment assembly (6). The fixture fixing plate (1) is horizontally fixed to the test platform, and the sliding assembly (3) and the fixture body (4) are installed on the upper surface of the fixture fixing plate (1). The fixture active end (2) is slidably connected to the fixture fixing plate (1) through the sliding assembly (3), and one end of the fixture active end (2) is connected to the MTS output end. There are two fixture bodies (4), which are symmetrically fixed on the upper surface of the fixture fixing plate (1) for fixing the shell to be tested. The force application assembly (5) is symmetrically installed inside the fixture active end (2) for transmitting load to the shell. The adjustment assembly (6) is assembled inside the fixture active end (2) for adjusting the position of the force application assembly (5) to eliminate the gap with the shell.

2. The novel shell dynamic strength clamp according to claim 1, characterized in that, The sliding assembly (3) includes a guide rail (31) and a slider (32); the guide rail (31) is fixed to the upper surface of the fixture fixing plate (1) by bolts; the slider (32) is fixedly connected to the lower surface of the fixture active end (2), and the slider (32) and the guide rail (31) slide together.

3. A novel shell dynamic strength clamp according to claim 2, characterized in that, The guide rail (31) is a linear guide rail, and a dust cover is provided on the outside of the guide rail (31).

4. A novel shell dynamic strength clamp according to claim 1, characterized in that, The force-applying component (5) includes a base (51), a locking block (52), and a striking block (53); the base (51) is fixedly installed on the inner wall of the active end (2) of the clamp, and a groove is provided on the side of the base (51) facing the housing; the locking block (52) is a trapezoidal structure and is movably embedded in the groove of the base (51); the striking block (53) is fixed on the side of the locking block (52) facing the housing, and the surface of the striking block (53) is adapted to the inner wall of the housing.

5. A novel shell dynamic strength clamp according to claim 4, characterized in that, The impact block (53) is made of nylon and is detachably connected to the locking block (52) by bolts, making it easy to replace impact blocks (53) of different sizes.

6. A novel shell dynamic strength clamp according to claim 5, characterized in that, The clearance between the groove for installing the locking block (52) and the base (51) is ≤0.05mm, and the surface roughness Ra of the inclined surface of the locking block (52) is ≤1.6μm, ensuring that the locking block (52) slides smoothly along the groove.

7. A novel shell dynamic strength clamp according to claim 6, characterized in that, The adjustment component (6) includes a bidirectional threaded shaft (61) and a trapezoidal block (62); the bidirectional threaded shaft (61) horizontally penetrates the side wall of the active end (2) of the clamp, and the surface of the bidirectional threaded shaft (61) is machined with a left-hand thread and a right-hand thread, and the pitch of the left-hand thread and the right-hand thread are the same; there are two trapezoidal blocks (62), which respectively engage with the left-hand thread and the right-hand thread of the bidirectional threaded shaft (61), and the side of the trapezoidal block (62) is in contact with the inclined surface of the locking block (52) of the force application component (5).

8. A novel shell dynamic strength clamp according to claim 7, characterized in that, The adjustment assembly (6) also includes nuts (63); there are two nuts (63), which are threaded onto both ends of the bidirectional threaded shaft (61) to lock the position of the bidirectional threaded shaft (61).

9. A novel shell dynamic strength clamp according to claim 7, characterized in that, The inclined angle of the trapezoidal block (62) is consistent with the inclined angle of the locking block (52), and the surface roughness Ra of the inclined surface of the trapezoidal block (62) is ≤1.6μm. The length of the trapezoidal block (62) is adapted to the inner width of the active end (2) of the clamp, so as to avoid the trapezoidal block (62) from shifting when it moves.

10. A novel shell dynamic strength clamp according to claim 1, characterized in that, The top of the fixture body (4) is provided with a positioning pin and bolt holes; the positioning pin is a cylindrical pin, used for quick centering of the housing; the distribution of the bolt holes is adapted to the mounting holes of the housing to be tested, ensuring that the housing is firmly fixed.

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