Reciprocating driving mechanism and endurance test tool

Abstract

The utility model relates to the technical field of testing, and discloses a reciprocating driving mechanism and an endurance test tool, at least two of a linkage part, an adjusting part and a driving shaft are configured to be relatively fixed, or any two of the linkage part, the adjusting part and the driving shaft can move relatively. Before durability testing is carried out on the to-be-tested piece, any two of the linkage part, the adjusting part and the driving shaft can move relatively, the linkage part is adjusted to be close to or away from the driving shaft relative to the driving shaft in the radial direction of the driving shaft through the adjusting part, the stroke of the reciprocating moving piece is adjusted, the testing requirements of different to-be-tested pieces are met, and universality is improved. In the process of carrying out a durability test on the to-be-tested piece, at least two of the linkage part, the adjusting part and the driving shaft can be relatively fixed, so that the joint part cannot adjust the position of the linkage part, and the stroke of the reciprocating moving piece can be kept unchanged in the working process of the reciprocating driving mechanism; the influence of the stroke change of the reciprocating moving part on the test result is avoided, and the accuracy of the test result is improved.

Description

Technical Field

[0001] This utility model relates to the field of testing technology, and in particular to a reciprocating drive mechanism and a durability testing fixture. Background Technology

[0002] When conducting durability tests on some vehicle components such as seat belts and B-pillar handles, reciprocating drive mechanisms, such as crank-rocker-slider mechanisms, are usually required. Specifically, a motor drives the crank to rotate, which in turn drives the rocker to rotate, causing the slider to move back and forth.

[0003] Because there are various test components, such as seat belts and B-pillar handles of different lengths, existing technology proposes to install a nut-screw structure on the crank to improve versatility. The nut is threadedly connected to the screw, the screw is rotatably connected to the crank, and the nut is slidably connected to the crank along the axial direction of the screw. The nut and crank are rotatably connected. By rotating the screw, the position of the nut relative to the crank is adjusted to regulate the slider stroke.

[0004] However, in practical applications, it was found that during the operation of the reciprocating drive mechanism, the stroke of the slider reciprocating will change slightly, which will directly reduce the accuracy of the test results. Utility Model Content

[0005] The primary objective of this invention is to provide a reciprocating drive mechanism that enables adjustable stroke while ensuring that the stroke remains constant during operation.

[0006] The second objective of this invention is to provide a durability testing fixture that allows for adjustable stroke to meet the testing requirements of different products, while maintaining a constant stroke throughout any testing process, thereby improving the accuracy of test results.

[0007] To achieve this objective, firstly, the reciprocating drive mechanism provided by this utility model includes:

[0008] A drive shaft, which is capable of rotation;

[0009] An adjusting part and a linkage part are provided, wherein the linkage part is connected to the drive shaft via the adjusting part, and the adjusting part makes the radial position of the linkage part adjustable along the drive shaft; the linkage part, the adjusting part, and the drive shaft are configured such that at least two of them can be relatively fixed, or any two of them can be relatively movable.

[0010] A reciprocating moving component and a mounting bracket, wherein the reciprocating moving component is reciprocally connected to the mounting bracket along a first direction;

[0011] A linkage rod, one end of which is rotatably connected to the reciprocating moving part, and the other end of which is rotatably connected to the linkage part.

[0012] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the reciprocating drive mechanism further includes:

[0013] A first locking lever, one end of which is rotatably connected to the linkage part;

[0014] A second locking lever, one end of which is rotatably connected to the drive shaft, and the other end of which is rotatably connected to the other end of the first locking lever;

[0015] The first locking lever can be fixed relative to the linkage part, and / or the second locking lever can be fixed relative to the drive shaft, and / or the first locking lever can be fixed relative to the second locking lever.

[0016] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the first locking rod is interference-fitted to the linkage part, and / or the second locking rod is interference-fitted to the drive shaft, and / or the first locking rod is interference-fitted to the second locking rod.

[0017] As an implementable technical solution for the above-mentioned reciprocating drive mechanism, the linkage part has a first end and a second end that are arranged opposite to each other, the first end is connected to the first locking rod, and the second end is connected to the linkage link.

[0018] The linkage part is provided with a through hole through which the adjustment part passes, and the through hole is located between the first end and the second end.

[0019] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the projections of the first locking rod, the second locking rod, and the adjusting part in a plane perpendicular to the axial direction of the drive shaft form a triangle.

[0020] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the adjusting part extends radially along the drive shaft, one end of the adjusting part is rotatably connected to one of the linkage part and the drive shaft, and the other end is threadedly connected to the other of the linkage part and the drive shaft.

[0021] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the linkage is rotatably connected to the adjustment part and is restricted to move axially relative to the adjustment part, and the adjustment part is threadedly connected to the drive shaft; the adjustment part can be fixed relative to the drive shaft.

[0022] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the reciprocating drive mechanism further includes a first locking member, which is detachably disposed in the linkage part and the adjustment part along the radial direction of the adjustment part; or, the linkage part is interference-fitted onto the adjustment part.

[0023] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the linkage part is threadedly connected to the adjustment part, and the adjustment part is rotatably connected to the drive shaft; the adjustment part can be fixed relative to the drive shaft.

[0024] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the adjusting part is interference-fitted to the drive shaft; or, the reciprocating drive mechanism further includes a second locking member, which is detachably inserted through the adjusting part and the drive shaft along the radial direction of the adjusting part.

[0025] As an implementable technical solution for the above-mentioned reciprocating drive mechanism, the reciprocating drive mechanism further includes a mounting component, which is fixedly connected to the drive shaft, and the linkage part is threadedly connected to the adjustment part and movably connected to the mounting component along the axial direction of the adjustment part;

[0026] The adjusting part is rotatably connected to the mounting member, and the linkage part is interference-fitted to the mounting member; or, the adjusting part is rotatably connected to the mounting member, and the reciprocating drive mechanism further includes a third locking member, which is detachably disposed along the radial direction of the adjusting part through the adjusting part and the mounting member; or, the adjusting part is rotatably connected to the mounting member, and the adjusting part is interference-fitted to the mounting member.

[0027] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the interference fit between the two structural components installed with interference fit is ΔL, where 0mm < ΔL ≤ 0.2mm.

[0028] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the reciprocating drive mechanism further includes:

[0029] A rotary drive component, the output end of which is fixedly connected to the drive shaft.

[0030] As one feasible technical solution for the above-mentioned reciprocating drive mechanism, the reciprocating moving part is connected to a mounting part for connecting the test piece.

[0031] Secondly, the durability testing fixture provided by this utility model includes a reciprocating drive mechanism as described in any of the above-described embodiments.

[0032] This utility model has at least the following beneficial effects:

[0033] The reciprocating drive mechanism provided by this utility model includes a linkage part, an adjusting part, and a drive shaft, configured such that at least two of them can be relatively fixed, or any two of them can move relatively. Before durability testing of the test piece, any two of the linkage part, adjusting part, and drive shaft can move relatively. The adjusting part adjusts the linkage part to move closer to or further away from the drive shaft radially, thereby adjusting the stroke of the reciprocating moving part. During durability testing of the test piece, at least two of the linkage part, adjusting part, and drive shaft are relatively fixed, preventing the adjusting part from adjusting the position of the linkage part. This helps to ensure that the stroke of the reciprocating moving part remains constant during the operation of the reciprocating drive mechanism.

[0034] The durability testing fixture provided by this utility model includes the aforementioned reciprocating drive mechanism. It can not only meet the testing requirements of different test pieces by adjusting the stroke of the reciprocating moving parts and improve versatility, but also keep the stroke of the reciprocating moving parts constant during the operation of the reciprocating drive mechanism, avoiding the impact of stroke changes on the test results and improving the accuracy of the test results. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the reciprocating drive mechanism provided in an embodiment of this utility model;

[0037] Figure 2 These are two extreme position diagrams of the reciprocating moving component in the reciprocating drive mechanism provided in this embodiment of the utility model;

[0038] Figures 3 to 6 This is a state diagram of the reciprocating drive mechanism during rotation provided in this embodiment of the utility model (the rotation angle of the drive shaft differs by 90° between two adjacent states);

[0039] Figure 7 This is a partial structural schematic diagram of the reciprocating drive mechanism provided in an embodiment of the present utility model;

[0040] Figure 8 This is a side view of the reciprocating drive mechanism provided in an embodiment of this utility model.

[0041] In the picture:

[0042] 1. Drive shaft; 2. Adjustment part; 3. Linkage part; 4. Reciprocating moving part; 5. Mounting bracket; 51. Fixed base; 52. Guide rod; 6. Linkage rod; 7. First locking rod; 8. Second locking rod; 9. Fixing part. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0047] Example 1

[0048] The present invention provides a reciprocating drive mechanism and a durability test fixture including the reciprocating drive mechanism. The durability test fixture is mainly used to perform durability performance tests on the test piece, such as friction durability tests on the height adjustment slide of the B-pillar or C-pillar, and durability tests on the B-pillar handle. These durability tests are existing technologies in the vehicle field and will not be described in detail here.

[0049] like Figure 1 and Figure 2 As shown, the reciprocating drive mechanism includes a drive shaft 1, an adjustment part 2, a linkage part 3, a reciprocating moving part 4, a mounting bracket 5, and a linkage rod 6. The drive shaft 1 is rotatable; the adjustment part 2 makes the linkage part 3 adjustable in the radial direction; the reciprocating moving part 4 is reciprocally movably connected to the mounting bracket 5 in a first direction; one end of the linkage rod 6 is rotatably connected to the reciprocating moving part 4, and the other end is rotatably connected to the linkage part 3.

[0050] The drive shaft 1 drives the adjustment part 2 to rotate around the central axis of the drive shaft 1, and the linkage part 3 drives the linkage rod 6 to swing, so that the linkage rod 6 pulls the reciprocating moving part 4 to move back and forth in the first direction.

[0051] Specifically, such as Figures 3 to 6 As shown, the rotation radius of the linkage 3 is R, where R is the distance between the rotation axis of the linkage 3 and the linkage rod 6 and the central axis of the drive shaft 1. The reciprocating motion of the reciprocating member 4 is S. The linkage 3 rotates one revolution under the drive of the drive shaft 1, following the adjustment 2. The reciprocating motion of the reciprocating member 4 is one cycle. The size of R directly affects the size of S. Specifically, S = 2R.

[0052] For example, the adjusting part 2 extends radially along the drive shaft 1, one end of the adjusting part 2 is rotatably connected to one of the linkage part 3 and the drive shaft 1, and the other end is threadedly connected to the other of the linkage part 3 and the drive shaft 1. In other words, the adjusting part and the linkage part 3 are combined to form a nut screw structure.

[0053] When it is necessary to adjust the stroke of the reciprocating moving part 4, the linkage part 3 can be moved closer to or further away from the drive shaft 1 along the axis of the adjustment part 2 by rotating the adjustment part 2, thereby adjusting the R and realizing the adjustment of S, meeting the testing requirements of different test parts and improving versatility.

[0054] However, in practical applications, it was found that the reciprocating drive mechanism vibrates frequently during operation. This frequent vibration causes the adjustment part 2 to rotate relative to the linkage part 3 or drive shaft 1 that is threadedly connected to it, resulting in a slight change in the value of R, which in turn causes a change in S. This contradicts the original intention of keeping S constant during a test and directly reduces the accuracy of the test results.

[0055] Therefore, in the reciprocating drive mechanism provided in the embodiments of this utility model, the linkage 3, the adjustment 2, and the drive shaft 1 are configured such that at least two of them can be relatively fixed, or any two of them can be relatively movable. In other words, the linkage 3, the adjustment 2, and the drive shaft 1 can switch between two states: at least two of them are relatively fixed, and any two of them can be relatively movable.

[0056] Before performing durability testing on the test piece, any two of the linkage 3, adjustment 2, and drive shaft 1 are allowed to move relative to each other. Rotating the adjustment 2 causes the linkage 3 to move closer to or further away from the drive shaft 1 along the axial direction of the adjustment 2, thus adjusting the stroke of the reciprocating moving part 4. During the durability testing of the test piece, at least two of the linkage 3, adjustment 2, and drive shaft 1 are kept relatively fixed, preventing the adjustment 2 from rotating. This helps to keep the travel distance (S) constant during the durability test, avoiding changes in S that could affect the test results and improving the accuracy of the test results.

[0057] For example, the linkage 3 is rotatably connected to the adjustment 2 and is restricted from axial movement relative to the adjustment 2, which is threadedly connected to the drive shaft 1. When it is necessary to adjust S by adjusting the size of R, the adjustment 2 is rotated, and the adjustment 2 moves axially. The length of the end of the adjustment 2 away from the linkage 3 extending out of the drive shaft 1 increases or decreases, and the adjustment 2 drives the linkage 3 to move axially, thereby changing the size of R.

[0058] Specifically, the upper end of the adjusting part 2 is provided with a limiting surface and a limiting groove arranged at intervals along its own axis, the linkage part 3 is provided with a through hole, the adjusting part 2 is disposed through the linkage part 3, a retaining ring is installed on the adjusting part 2, the retaining ring is locked in the groove, and the linkage part 3 is clamped between the limiting surface and the retaining ring along the axis of the adjusting part 2 to restrict the movement of the linkage part 3 along the axis of the adjusting part 2.

[0059] Optionally, such as Figure 1 , Figure 7 and Figure 8 As shown, the reciprocating drive mechanism also includes a first locking rod 7 and a second locking rod 8. One end of the first locking rod 7 is rotatably connected to the linkage part 3; one end of the second locking rod 8 is rotatably connected to the drive shaft 1, and the other end is rotatably connected to the other end of the first locking rod 7. The first locking rod 7 can be fixed relative to the linkage part 3, the second locking rod 8 can be fixed relative to the drive shaft 1, and the first locking rod 7 can be fixed relative to the second locking rod 8.

[0060] For example, the first locking rod 7 is interference-fitted to the linkage part 3, and the second locking rod 8 is interference-fitted to the drive shaft 1. Alternatively, a first through hole can be provided in one of the first locking rod 7 and the linkage part 3, and a second through hole can be provided in the other. The second through hole is an arc-shaped hole extending circumferentially around the axis of relative rotation between the first locking rod 7 and the linkage part 3. A bolt is passed through the first through hole and the arc-shaped hole, and a lock nut is threadedly connected to fix the first locking rod 7 and the linkage part 3 relative to each other. When it is necessary to rotate the first locking rod 7 relative to the linkage part 3, the lock nut can be loosened. The second locking rod 8 and the drive shaft 1 can also adopt a similar structure to allow them to be selectively fixed or movable relative to each other. The first locking rod 7 and the second locking rod 8 can also adopt a similar structure to allow them to be selectively fixed or movable relative to each other.

[0061] When it is necessary to adjust S by adjusting the size of R, the adjusting part 2 is rotated. In order to move the adjusting part 2 axially, the first locking rod 7 and the second locking rod 8 need to rotate relative to each other, and the first locking rod 7 and the linkage part 3 need to rotate relative to each other, and the second locking rod 8 and the drive shaft 1 need to rotate relative to each other. This makes the force applied to the adjusting part 2 to make the adjusting part 2 rotate larger, so that the vibration during the operation of the reciprocating drive mechanism is less likely to cause the adjusting part 2 to rotate. This is beneficial to keep R unchanged during the operation of the reciprocating drive mechanism, so that the stroke of the reciprocating moving part 4 remains unchanged.

[0062] For example, the interference fit between the first locking rod 7 and the second locking rod 8, the interference fit between the first locking rod 7 and the linkage part 3, and the interference fit between the second locking rod 8 and the drive shaft 1 are all ΔL, where 0mm < ΔL ≤ 0.2mm. If ΔL is too small (e.g., ΔL = 0mm), it is not conducive to keeping R constant during the operation of the reciprocating drive mechanism; if ΔL is too large (e.g., ΔL > 0.2mm), adjusting S by adjusting R requires an excessive force to rotate the adjusting part 2, making rotation difficult and resulting in significant frictional loss between the two interference-fitted structural components. Therefore, limiting ΔL to greater than 0mm and less than or equal to 0.2mm not only helps keep R constant during the operation of the reciprocating drive mechanism but also extends the service life of the adjusting part 2.

[0063] It should be noted that the interference fit amounts between the three sets of interference fit structural components mentioned above can be the same, different, or the same.

[0064] For example, the first locking rod 7 and the second locking rod 8 are connected by a pin, the second locking rod 8 is sleeved outside the drive shaft 1, and the first locking rod 7 is sleeved outside the linkage part 3.

[0065] Optionally, the first locking lever 7, the second locking lever 8, and the adjusting part 2 are arranged in a triangle in a plane perpendicular to the axial direction of the drive shaft 1. This arrangement helps to improve the stability of the adjusting part 2 during the operation of the reciprocating drive mechanism and helps to keep R constant.

[0066] The axis of relative rotation between the first locking lever 7 and the second locking lever 8 is the first axis, and the distance between the first axis and the central axis of the drive shaft 1 is L1. The axis of relative rotation between the first locking lever 7 and the linkage part 3 is the second axis. Both the first and second axes are parallel to the central axis of the drive shaft 1, and the distance between the second axis and the first axis is L2. When R = L1 + L2, the first axis, the second axis, and the central axis of the drive shaft 1 are coplanar, making it impossible for the first locking lever 7, the second locking lever 8, and the adjusting part 2 to be arranged in a triangle in a plane perpendicular to the axial direction of the drive shaft 1. Therefore, in order to ensure that the first locking lever 7, the second locking lever 8, and the adjusting part 2 are arranged in a triangle in a plane perpendicular to the axial direction of the drive shaft 1 during the operation of the reciprocating drive mechanism, R < L1 + L2.

[0067] In addition, the appropriateness of R can be determined by measuring the angle between the first locking lever 7 and the second locking lever 8; the appropriateness of R can also be determined by directly measuring the distance between the central axis and the second axis of the drive shaft 1.

[0068] Optionally, such as Figure 1 As shown, the linkage 3 has a first end and a second end arranged opposite to each other. The first end is connected to the first locking rod 7, and the second end is connected to the linkage link 6. The linkage 3 is provided with a through hole for the adjustment part 2, which is located between the first end and the second end. During the operation of the reciprocating drive mechanism, the first locking rod 7 and the second locking rod 8 will generate centrifugal force. By placing the through hole between the first end and the second end, it is beneficial to reduce the torsional force borne by the linkage 3 during the operation of the reciprocating drive mechanism, thereby protecting the linkage 3 and extending its service life.

[0069] Optionally, one end of the adjusting part 2 is provided with a screw handle, which facilitates rotating the adjusting part 2 by turning the screw handle.

[0070] Optionally, the reciprocating drive mechanism further includes a rotary drive component, the output end of which is fixedly connected to the drive shaft 1. For example, the rotary drive component is a motor, which drives the adjusting part 2 to rotate via the drive shaft 1, and the linkage part 3 drives the linkage rod 6 to swing, causing the reciprocating moving part 4 to move back and forth. As an alternative, the drive shaft 1 can also be the output shaft of a motor.

[0071] Optionally, such as Figure 1As shown, a fixing member 9 is sleeved on the drive shaft 1, and the fixing member 9 is fixed. The drive shaft 1 and the fixing member 9 are rotatably connected by a bearing. The fixing member 9 improves the stability of the drive shaft 1 during rotation. Exemplarily, there are two fixing members 9, which are arranged at an axial distance along the drive shaft 1.

[0072] Optionally, the reciprocating moving part 4 is connected to a mounting part for connecting the test piece. It should be noted that the mounting part can be determined according to the type of the test piece. A general-purpose mounting part can be used, or the mounting part can be detachably installed on the reciprocating moving part 4, so as to facilitate the selection of the appropriate mounting part according to the type of the test piece and the installation of the selected mounting part on the reciprocating moving part 4.

[0073] Optionally, such as Figure 1 As shown, the mounting bracket 5 includes a fixed base 51 and two guide rods 52 mounted on the fixed base 51. A reciprocating moving member 4 passes through the two guide rods 52 and slides along the guide rods 52 in a first direction. The two guide rods 52 restrict the rotation of the reciprocating moving member 4 and guide its reciprocating movement, improving the stability of the reciprocating moving member 4 during its reciprocating movement. It should be noted that the mounting bracket 5 and the reciprocating moving member 4 can also adopt a slide rail and slider structure as used in the prior art, which will not be described in detail here.

[0074] Example 2

[0075] The difference between this embodiment and Embodiment 1 is that the reciprocating drive mechanism further includes a first locking member, replacing the structure formed by the first locking rod 7 and the second locking rod 8 in Embodiment 1. Specifically, the first locking member is detachably inserted into the linkage part 3 and the adjustment part 2 along the radial direction of the adjustment part 2. Before the reciprocating drive mechanism operates, the first locking member is detachably inserted into the linkage part 3 and the adjustment part 2 along the radial direction of the adjustment part 2, preventing the adjustment part 2 from rotating relative to the linkage part 3. The linkage part 3 is also restricted from rotating due to the action of the linkage rod 6, preventing the adjustment part 2 and the linkage part 3 from rotating together. This achieves the purpose of restricting the rotation of the adjustment part 2. By restricting the rotation of the adjustment part 2, R cannot be adjusted, thus ensuring that R remains constant during the operation of the reciprocating drive mechanism.

[0076] When it is necessary to adjust S by adjusting the size of R, the first locking member is removed, and the adjusting part 2 is rotated to move axially, so that the linkage part 3 moves axially with the adjusting part 2, thereby adjusting R and thus realizing the adjustment of S.

[0077] For example, the inner wall of the through hole is provided with a first light hole that extends radially along the adjustment part 2 to the outer wall of the adjustment part 2, and the linkage part 3 is provided with a first threaded hole. One end of the first locking member passes through the first light hole and is threadedly connected to the first threaded hole.

[0078] Example 3

[0079] The difference between this embodiment and Embodiment 1 is that the linkage part 3 is installed on the adjustment part 2 with an interference fit, so as to replace the structure composed of the first locking rod 7 and the second locking rod 8 in Embodiment 1.

[0080] The frictional resistance between the linkage 3 and the adjustment 2 restricts the rotation of the adjustment 2. When the circumferential force applied to the adjustment 2 is less than the frictional resistance between the linkage 3 and the adjustment 2, the adjustment 2 cannot rotate relative to the linkage 3, and R cannot be adjusted. When the circumferential force applied to the adjustment 2 is greater than the frictional resistance between the linkage 3 and the adjustment 2, the adjustment 2 rotates relative to the linkage 3, and R can be adjusted.

[0081] Optionally, the interference fit between the linkage 3 and the adjusting part 2 is ΔL, where 0mm < ΔL ≤ 2mm. If ΔL is too small (e.g., ΔL = 0mm), the friction between the linkage 3 and the adjusting part 2 is too small, which is not conducive to keeping the adjusting part 2 and the linkage 3 relatively fixed during the operation of the reciprocating drive mechanism. If ΔL is too large (e.g., ΔL > 0.2mm), the force required to rotate the adjusting part 2 when adjusting S by adjusting R is too large, making the rotation of the adjusting part 2 difficult and resulting in greater frictional wear between the adjusting part 2 and the linkage 3, which will shorten the service life of the adjusting part 2 and the linkage 3. Therefore, limiting ΔL to greater than 0mm and less than or equal to 0.2mm not only helps R remain constant during the operation of the reciprocating drive mechanism but also helps to extend the service life of the adjusting part 2.

[0082] Example 4

[0083] The difference between this embodiment and Embodiment 1 is that the linkage 3 is threadedly connected to the adjustment 2, and the adjustment 2 is rotatably connected to the drive shaft 1. Since the reciprocating moving part 4 is movably connected to the mounting bracket 5 along the first direction, one end of the linkage rod 6 is rotatably connected to the linkage 3, and the other end is rotatably connected to the reciprocating moving part 4, so that when the adjustment 2 rotates, the linkage 3 will not rotate with the adjustment 2, but will move along the axial direction of the adjustment 2, causing R to change, thereby adjusting S by adjusting the size of R.

[0084] Optionally, the adjusting part 2 can be fixed relative to the drive shaft 1. Exemplarily, the adjusting part 2 is interference-fitted to the drive shaft 1, replacing the structure formed by the first locking lever 7 and the second locking lever 8 in Embodiment 1. The frictional resistance between the adjusting part 2 and the drive shaft 1 restricts the rotation of the adjusting part 2. When the circumferential force applied to the adjusting part 2 is less than the frictional resistance between the adjusting part 2 and the drive shaft 1, the adjusting part 2 cannot rotate relative to the drive shaft 1, and R cannot be adjusted; when the circumferential force applied to the adjusting part 2 is greater than the frictional resistance between the adjusting part 2 and the drive shaft 1, the adjusting part 2 rotates relative to the drive shaft 1, and R can be adjusted.

[0085] Optionally, the interference fit between the adjusting part 2 and the drive shaft 1 is ΔL, where 0mm < ΔL ≤ 2mm. If ΔL is too small, such as ΔL = 0mm, the friction between the adjusting part 2 and the drive shaft 1 is too small, which is not conducive to keeping the adjusting part 2 and the drive shaft 1 relatively fixed during the operation of the reciprocating drive mechanism. If ΔL is too large, such as ΔL > 0.2mm, the force required to rotate the adjusting part 2 when adjusting S by adjusting R is too large, making the rotation of the adjusting part 2 difficult and the friction loss between the adjusting part 2 and the drive shaft 1 large, which will shorten the service life of the adjusting part 2 and the drive shaft 1. Therefore, limiting ΔL to greater than 0mm and less than or equal to 0.2mm not only helps R remain unchanged during the operation of the reciprocating drive mechanism, but also helps to extend the service life of the adjusting part 2.

[0086] Example 5

[0087] The difference between this embodiment and embodiment four is that the interference fit between the adjusting part 2 and the drive shaft 1 in embodiment four is removed, and a second locking member is added. The second locking member is detachably inserted into the adjusting part 2 and the drive shaft 1 along the radial direction of the adjusting part 2.

[0088] Before the reciprocating drive mechanism is in operation, the second locking member is detachably inserted into the adjustment part 2 and the drive shaft 1 along the radial direction of the adjustment part 2, so that the adjustment part 2 cannot rotate relative to the drive shaft 1, thereby limiting the rotation of the adjustment part 2. By limiting the rotation of the adjustment part 2, R cannot be adjusted, so that R remains unchanged during the operation of the reciprocating drive mechanism.

[0089] When it is necessary to adjust S by adjusting the size of R, the second locking member is removed, and the linkage part 3 is moved along the axis of the adjustment part 2 by rotating the adjustment part 2, which plays the role of adjusting R, thereby realizing the adjustment of S.

[0090] For example, the drive shaft 1 is provided with a rotating hole extending radially therein, and one end of the adjustment part 2 is inserted into the rotating hole; the inner wall of the rotating hole is provided with a second light hole, the adjustment part 2 is provided with a second threaded hole, and one end of the second locking member passes through the second light hole and is threadedly connected to the second threaded hole.

[0091] Example 6

[0092] The difference between this embodiment and Embodiment 1 is that the first locking lever 7 and the second locking lever 8 are removed, and the structure of the linkage 3 moving along the axial direction of the adjustment part 2 by rotating the adjustment part 2 is different.

[0093] Specifically, the reciprocating drive mechanism also includes a mounting component, which is fixedly connected to the drive shaft 1. The linkage part 3 is threadedly connected to the adjustment part 2 and is movably connected to the mounting component along the axial direction of the adjustment part 2. The adjustment part 2 is rotatably connected to the mounting component, and the linkage part 3 is interference-fitted to the mounting component.

[0094] When the value of R needs to be adjusted, the adjusting part 2 is rotated. The linkage part 3, movably mounted on the mounting part along the axial direction of the adjusting part 2, restricts the rotation of the linkage part 3 relative to the mounting part. Furthermore, the force of the circumferential rotation of the adjusting part 2 is converted into a force that causes the linkage part 3 to move axially along the adjusting part 2. When the force causing the linkage part 3 to move axially along the adjusting part 2 is greater than the frictional resistance of the interference fit between the linkage part 3 and the mounting part, the linkage part 3 will move axially along the adjusting part 2, thus adjusting the value of R. When the force causing the linkage part 3 to move axially along the adjusting part 2 is not greater than the frictional resistance of the interference fit between the linkage part 3 and the mounting part, rotating the adjusting part 2 will not cause the linkage part 3 to move axially, which is beneficial for keeping R constant during the operation of the reciprocating drive mechanism.

[0095] Optionally, the interference fit between the linkage 3 and the mounting part is ΔL, where 0mm < ΔL ≤ 0.2mm. If ΔL is too small, such as ΔL = 0mm, the friction between the linkage 3 and the mounting part is too small, which is not conducive to limiting the axial movement of the linkage 3 relative to the mounting part along the adjusting part 2 during the operation of the reciprocating drive mechanism. If ΔL is too large, such as ΔL > 0.2mm, the force required to rotate the adjusting part 2 when adjusting S by adjusting R is too large, making the rotation of the adjusting part 2 difficult, and the friction loss between the linkage 3 and the mounting part is large. Therefore, limiting ΔL to greater than 0mm and less than or equal to 0.2mm not only helps R remain unchanged during the operation of the reciprocating drive mechanism, but also helps to extend the service life of the adjusting part 2.

[0096] Example 7

[0097] The difference between this embodiment and embodiment six is ​​that the interference fit between the linkage part 3 and the mounting part is eliminated, the adjustment part 2 is rotatably connected to the mounting part, and a third locking part is added. The third locking part is detachably inserted into the adjustment part 2 and the mounting part along the radial direction of the adjustment part 2.

[0098] Before the reciprocating drive mechanism operates, the third locking member is detachably inserted into the adjustment part 2 and the mounting part along the radial direction of the adjustment part 2, so that the adjustment part 2 cannot rotate relative to the mounting part, thereby restricting the rotation of the adjustment part 2. By restricting the rotation of the adjustment part 2, R cannot be adjusted, so that R remains unchanged during the operation of the reciprocating drive mechanism.

[0099] When it is necessary to adjust S by adjusting the size of R, the third locking part is removed, and the linkage part 3 is moved axially relative to the mounting part by rotating the adjustment part 2, which plays the role of adjusting R, thereby realizing the adjustment of S.

[0100] For example, the mounting part is provided with a mounting hole extending axially along the adjustment part 2, and one end of the adjustment part 2 is rotatably inserted into the mounting hole about its own axis; the inner wall of the mounting hole is provided with a third light hole, the adjustment part 2 is provided with a third threaded hole, and one end of the third locking member passes through the third light hole and is threadedly connected to the third threaded hole.

[0101] For example, the linkage 3 is slidably connected to the mounting member along the axis of the adjustment part 2. The sliding fit between the linkage 3 and the mounting member restricts the rotation of the linkage 3 relative to the mounting member and guides the movement of the linkage 3 along the axis of the adjustment part 2.

[0102] Example 8

[0103] The difference between this embodiment and embodiment six is ​​that the interference fit between the linkage part 3 and the mounting part is eliminated, and the adjustment part 2 is rotatably connected to the mounting part and is installed on the mounting part with an interference fit.

[0104] When the value of R needs to be adjusted, a force is applied to the adjusting part 2. If the force applied to the adjusting part 2 causing it to rotate circumferentially is not greater than the frictional resistance between the adjusting part 2 and the mounting part, the adjusting part 2 cannot rotate, which helps to keep R constant during the operation of the reciprocating drive mechanism. If the force applied to the adjusting part 2 causing it to rotate circumferentially is greater than the frictional resistance between the adjusting part 2 and the mounting part, the adjusting part 2 rotates, and the linkage part 3 moves along the axial direction of the adjusting part 2, thus achieving the adjustment of the value of R.

[0105] Optionally, the interference fit between the adjusting part 2 and the mounting part is ΔL, where 0mm < ΔL ≤ 0.2mm. If ΔL is too small (e.g., ΔL = 0mm), the friction between the adjusting part 2 and the mounting part is too small, which is not conducive to limiting the adjusting part 2 relative to the mounting part during the operation of the reciprocating drive mechanism. If ΔL is too large (e.g., ΔL > 0.2mm), the force required to rotate the adjusting part 2 when adjusting S by adjusting R is too large, making the rotation of the adjusting part 2 difficult, and the friction loss between the adjusting part 2 and the mounting part is large. Therefore, limiting ΔL to greater than 0mm and less than or equal to 0.2mm not only helps R remain constant during the operation of the reciprocating drive mechanism, but also helps to extend the service life of the adjusting part 2.

[0106] Example 9

[0107] The difference between this embodiment and Embodiment 1 is that a gear and rack structure is used instead of a nut and lead screw structure. Specifically, a drive shaft 1 is fixedly connected to an assembly, which extends radially along the drive shaft 1. An assembly groove is formed on the assembly along its extension direction. The assembly groove is a U-shaped groove. A gear is fixedly installed on a rotating shaft. The two ends of the rotating shaft are rotatably connected to the opposite side walls of the assembly groove. The rack is slidably disposed in the assembly groove along the extension direction of the assembly. The rack is rotatably connected to the side of the linkage 6 away from the reciprocating moving part 4.

[0108] By rotating the rotating shaft, the gear drives the rack to move closer to or further away from the drive shaft 1 along the extension direction of the assembly, thereby adjusting the stroke of the reciprocating moving part 4.

[0109] A first through hole is provided on the rack, and a second through hole is provided on the assembly. The second through hole is an elongated hole extending along the extension direction of the assembly itself. A bolt passes through the first and second through holes and is threaded onto a lock nut to fix the rack and assembly relatively, preventing changes in their relative positions during the operation of the reciprocating drive mechanism from affecting the stroke of the reciprocating moving part 4. When it is necessary to adjust the stroke of the reciprocating moving part 4, the lock nut is loosened, and the rack is moved closer to or away from the drive shaft 1 by rotating the gear. After adjustment, the lock nut is tightened to lock the rack and assembly.

[0110] Furthermore, the linkage 6 is rotatably connected to the rack via a rotating shaft, with the end of the linkage 6 furthest from the reciprocating moving part 4 located on one side of the rack's thickness direction and on the side of the assembly. This avoids interference between the rack and the assembly on the rotation of the linkage 6.

[0111] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A reciprocating drive mechanism characterised in that, The reciprocating drive mechanism comprises: a driving shaft (1) capable of rotating; an adjusting part (2) and a linkage part (3) connected to the driving shaft (1) through the adjusting part (2), the adjusting part (2) being capable of adjusting the radial position of the linkage part (3) along the driving shaft (1); the linkage part (3), the adjusting part (2) and the driving shaft (1) being configured such that at least two of them are capable of relative fixation, or any two of them are capable of relative movement; a reciprocating moving part (4) and a mounting bracket (5), the reciprocating moving part (4) being reciprocally movably connected to the mounting bracket (5) in a first direction; a linkage connecting rod (6) having one end rotatably connected to the reciprocating moving part (4) and the other end rotatably connected to the linkage part (3).

2. The reciprocating drive mechanism of claim 1, wherein, The reciprocating drive mechanism further comprises: a first locking rod (7) having one end rotatably connected to the linkage part (3); a second locking rod (8) having one end rotatably connected to the driving shaft (1) and the other end rotatably connected to the other end of the first locking rod (7); the first locking rod (7) being capable of being fixed relative to the linkage part (3), and / or the second locking rod (8) being capable of being fixed relative to the driving shaft (1), and / or the first locking rod (7) being capable of being fixed relative to the second locking rod (8).

3. The reciprocating drive mechanism of claim 2, wherein, the first locking rod (7) being interference-fitted to the linkage part (3), and / or the second locking rod (8) being interference-fitted to the driving shaft (1), and / or the first locking rod (7) being interference-fitted to the second locking rod (8).

4. The reciprocating drive mechanism of claim 2, wherein, the linkage part (3) having oppositely arranged first and second ends, the first end being connected to the first locking rod (7) and the second end being connected to the linkage connecting rod (6); the linkage part (3) being provided with a through hole for the adjusting part (2), the through hole being located between the first and second ends.

5. The reciprocating drive mechanism of claim 2, wherein, the first locking rod (7), the second locking rod (8) and the adjusting part (2) being projected in a plane perpendicular to the axial direction of the driving shaft (1) to form a triangle.

6. The reciprocating drive mechanism of claim 1, wherein, the adjusting part (2) extending radially along the driving shaft (1), one end of the adjusting part (2) being rotatably connected to one of the linkage part (3) and the driving shaft (1), and the other end being threadedly connected to the other one of the linkage part (3) and the driving shaft (1).

7. A reciprocating drive mechanism according to claim 6, characterised in that the linkage part (3) being rotatably connected to the adjusting part (2) and being limited to axial movement relative to the adjusting part (2), the adjusting part (2) being threadedly connected to the driving shaft (1); the adjusting part (2) being capable of being fixed relative to the driving shaft (1).

8. The reciprocating drive mechanism of claim 7, wherein, the reciprocating drive mechanism further comprising a first locking member, the first locking member being detachably threaded in the radial direction of the adjusting part (2) through the linkage part (3) and the adjusting part (2); or, the linkage part (3) being interference-fitted to the adjusting part (2).

9. The reciprocating drive mechanism of claim 6, wherein, The linkage part (3) is threadedly connected to the adjusting part (2), and the adjusting part (2) is rotationally connected to the driving shaft (1); The adjusting part (2) is fixed relative to the driving shaft (1).

10. The reciprocating drive mechanism of claim 9, wherein, The adjusting part (2) is interference-fitted to the driving shaft (1); or the reciprocating driving mechanism further comprises a second locking member, which is detachably arranged along the radial direction of the adjusting part (2) and penetrates the adjusting part (2) and the driving shaft (1).

11. The reciprocating drive mechanism of claim 6, wherein, The reciprocating driving mechanism further comprises a mounting member, which is fixedly connected to the driving shaft (1), and the linkage part (3) is threadedly connected to the adjusting part (2) and movably connected to the mounting member along the axial direction of the adjusting part (2); The adjusting part (2) is rotationally connected to the mounting member, and the linkage part (3) is interference-fitted to the mounting member; or the adjusting part (2) is rotationally connected to the mounting member, and the reciprocating driving mechanism further comprises a third locking member, which is detachably arranged along the radial direction of the adjusting part (2) and penetrates the adjusting part (2) and the mounting member; or the adjusting part (2) is rotationally connected to the mounting member, and the adjusting part (2) is interference-fitted to the mounting member.

12. The reciprocating drive mechanism of claim 3, 8, 10, or 11, wherein, The interference fit amount between the two interference-fitted structural members is △L, and 0mm<△L≤0.2mm.

13. A reciprocating drive mechanism according to any one of claims 1 to 11, characterised in that, The reciprocating driving mechanism further comprises: A rotary driving member, and an output end of the rotary driving member is fixedly connected to the driving shaft (1).

14. A reciprocating drive mechanism according to any one of claims 1 to 11, characterised in that, The reciprocating moving part (4) is connected with a mounting part for connecting a to-be-tested member.

15. A durability test test fixture characterized by, The reciprocating driving mechanism comprises any one of claims 1 to 14. The reciprocating driving mechanism comprises any one of claims 1 to 14.

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