A dust cover testing device for automobiles

Abstract

This utility model relates to a testing device for automotive dust covers, including a test frame, a lifting platform, an upper clamp, and a lower clamp. The lower clamp includes a chassis, a mandrel, an outer limiting clamp, and a threaded collar. The chassis is detachably mounted in the middle of the lifting platform. The mandrel is vertically fixed at the center of the chassis. The outer limiting clamp is a semi-circular clamp adapted to the size of the dust cover. The bottom of the outer limiting clamp slides left and right on the chassis, and two sets of outer limiting clamps are symmetrically arranged on the left and right. The outer surface of the outer limiting clamp has a tapered shape that gradually expands from top to bottom and is provided with external threads. The threaded collar is threadedly connected to the outer surfaces of the two outer limiting clamps, tightening the two outer limiting clamps and clamping and limiting the lower end of the dust cover between the outer limiting clamp and the mandrel. When the dust cover is clamped, the mandrel provides internal support and positioning, and the outer limiting clamp is evenly tightened inward by the tightening action of the threaded collar.

Description

Technical Field

[0001] This utility model relates to the field of automotive dust cover technology, and specifically to an automotive dust cover testing device. Background Technology

[0002] Automotive dust covers are flexible protective covers used to protect critical moving parts of a vehicle from contaminants such as dust, mud, and moisture. They are mainly used in suspension systems, steering systems, and transmission systems. Their core functions are to extend the life of components, maintain lubrication performance, and prevent abnormal noises or jamming.

[0003] When conducting tensile tests on dust covers, existing technologies generally use two clamping devices to hold the upper and lower ends of the dust cover and stretch it to a specified length to simulate its deformation during actual installation or movement. By visual inspection and other methods, it is determined whether problems such as whitening, cracking, expansion, twisting, or warping occur, in order to evaluate its axial elongation performance.

[0004] Common dust covers are typically hollow, flexible structures with openings at the top and bottom. They are mainly made of flexible materials such as rubber and thermoplastic elastomers (TPE, TPV) through extrusion blow molding. Their appearance is often pleated and corrugated, so that they can expand and contract during component movement without affecting sealing performance.

[0005] Because the dust cover is formed by extrusion, there is often a material head left at the top during the testing stage. The material head has a large wall thickness and good rigidity and compressive strength, and can be directly fixed by conventional clamping structures such as wedge chucks. However, the bottom of the dust cover is usually a flexible and hollow pleated section. This part has a thin wall thickness, is easy to deform, and has wrinkles on the outer surface. Conventional clamps such as three-jaw chucks are difficult to use for stable clamping and can easily cause additional damage to the dust cover, affecting the test structure.

[0006] Therefore, it is necessary to research a dust cover detection device for automobiles. Utility Model Content

[0007] Therefore, the purpose of this utility model is to provide a dust cover testing device for automobiles, which can effectively solve the problem that the existing tensile test fixtures are difficult to effectively clamp the lower end of the dust cover.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An automotive dust cover testing device includes a test frame, a lifting platform, an upper clamp, and a lower clamp; The test frame is equipped with a lifting platform that moves vertically via a lifting mechanism. The upper clamp is fixedly installed on the top of the test frame to clamp and fix the upper end of the dust cover; The lower clamp is fixedly mounted on the lifting platform to clamp and fix the bottom of the dust cover. The lower clamp includes a base, a mandrel, an outer limiting clamp, and a threaded collar; The chassis is detachably mounted in the middle of the lifting platform; The spindle is vertically fixed at the center of the chassis; The outer limiting clamp is a semi-circular clamp that is adapted to the size of the dust cover. The bottom of the outer limiting clamp is slidably mounted on the chassis, and two sets of outer limiting clamps are symmetrically arranged on the left and right. The outer surface of the outer limiting clamp has a tapered shape that gradually expands from top to bottom, and is provided with external threads; The threaded collar is threadedly connected to the outer surface of the two outer limiting clamps, and tightens the two outer limiting clamps and clamps and limits the lower end of the dust cover between the outer limiting clamps and the mandrel.

[0009] Furthermore, a slider is fixedly connected to the outer wall of the outer limiting clamp, and a groove adapted to the slider is provided on the chassis.

[0010] Furthermore, it also includes guide seats and guide rods. The guide seat is fixed on the chassis and located on the left and right sides of the outer limiting clamp. A through sliding hole is horizontally opened on the guide seat. One end of the guide rod is slidably disposed in the sliding hole, and the other end of the guide rod is fixedly connected to the slider.

[0011] Furthermore, a return spring is sleeved on the guide rod, and the return spring is located between the guide seat and the slider, so that the slider is subjected to a spring force toward the spindle.

[0012] Furthermore, a flexible inner liner is fixed to the inner surface of the outer limiting clamp, and a flexible outer sleeve is fixed to the outer surface of the mandrel.

[0013] Furthermore, the inner wall of the flexible liner is adapted to the outer contour shape of the dust cover, and the outer wall of the flexible outer jacket is adapted to the inner contour shape of the dust cover.

[0014] The beneficial effects of the above technical solution are: This utility model's lower clamp includes a vertical mandrel and an outer limiting clamp adapted to the shape of the dust cover. During clamping, the mandrel provides internal support and positioning for the dust cover, solving the problem of the lower end of the dust cover being difficult to clamp directly due to its soft material. The outer limiting clamp adopts a symmetrical semi-circular clamping body that can slide and close on the base. Through the tightening action of the threaded collar, the outer limiting clamp is evenly tightened inward, thereby forming a circumferentially distributed clamping force on the lower end of the dust cover, achieving stable clamping of the dust cover. Because the outer surface of the outer limiting clamp is designed with a gradually expanding taper from top to bottom, a self-guiding wedge-tightening effect is generated during the downward rotation of the threaded collar, making the clamping effect more reliable. This ensures the uniformity of force and positioning stability of the dust cover during the tensile process, thereby improving the accuracy and repeatability of the test data. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of the present utility model; Figure 2 This is a three-dimensional schematic diagram of the lower fixture; Figure 3 for Figure 2 Top view; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 This is a schematic diagram of the slider assembly.

[0016] Reference numerals: 1. Test frame; 2. Lifting platform; 3. Upper clamp; 4. Lower clamp; 5. Base; 6. Mandrel; 7. External limit clamp; 8. Threaded collar; 9. Slider; 10. Guide seat; 11. Guide rod; 12. Return spring; 13. Flexible inner liner; 14. Flexible outer jacket; 15. Dust cover; 501. Slide groove. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: This embodiment aims to provide a testing device for automotive dust covers, which is mainly used for tensile testing of dust covers, addressing the problem that existing tensile testing fixtures are unable to effectively clamp the lower end of the dust cover.

[0018] A dust cover detection device for automobiles, such as Figure 1The test setup includes a test frame 1, a lifting platform 2, an upper clamp 3, and a lower clamp 4. The lifting platform 2 is vertically mounted on the test frame 1 via a lifting mechanism. Specifically, it consists of two support frames on either side and a mounting frame at the top. The mounting frame is fixedly connected between the tops of the two support frames, and the support frames have vertically extending connecting grooves inside. The lifting platform 2 is positioned between the two support frames, and the support frames are equipped with a drive mechanism for moving the lifting platform 2 vertically. The drive mechanism is a lead screw mechanism, mainly consisting of a drive screw and a motor. The drive screw extends vertically and is rotatably connected to the connecting groove of the right support frame. The motor is fixedly mounted on the upper surface of the mounting frame, and the motor's output end is fixedly connected to the upper end of the drive screw. A guide screw is installed in the connecting groove of the left support frame.

[0019] The upper clamp 3 is fixedly mounted on the top of the test frame 1 to clamp and fix the upper end of the dust cover 15. Because it is formed by extrusion molding, a material head often remains at the upper end of the dust cover 15 during the testing stage. This material head has a large wall thickness, good rigidity and compressive strength, and needs to be removed later. Therefore, the upper clamp 3 can use existing clamps for direct clamping and fixing. Figure 1 Only one existing fixture is shown here, which is commonly used for tensile testing. Its specific structure and working principle will not be described in detail here.

[0020] The lower clamp 4 is fixedly mounted on the lifting platform 2 to clamp and fix the bottom of the dust cover 15. The innovation of this embodiment lies in the structural design of the lower clamp 4, which replaces the three-jaw chuck to stably clamp and fix the lower end of the dust cover 15.

[0021] like Figure 2 The lower clamp 4 includes a base plate 5, a spindle 6, an outer limiting clamp 7, and a threaded collar 8. The base plate 5 is detachably mounted in the middle of the lifting platform 2, and the spindle 6 is vertically fixed in the center of the base plate 5. When in use, the lower end of the dust cover 15 is fitted onto the spindle 6, and the spindle 6 provides internal support and limiting for the dust cover 15.

[0022] like Figure 2-5 The outer limiting clamp 7 is a semi-circular clamp that is adapted to the size of the dust cover 15. Two sets of outer limiting clamps 7 are symmetrically arranged on the left and right. The bottom of the outer limiting clamp 7 is slidably mounted on the chassis 5. Specifically, the outer wall of the outer limiting clamp 7 is fixedly connected to the slider 9. The chassis 5 is provided with a sliding groove 501 adapted to the slider 9, so that the two sets of outer limiting clamps 7 can move left and right to clamp the dust cover 15 sleeved on the spindle 6, or move away from each other to facilitate the loading of the dust cover 15.

[0023] Furthermore, it also includes a guide seat 10 and a guide rod 11. The guide seat 10 is fixed on the chassis 5 and located on the left and right sides of the outer limiting clamp 7. A through sliding hole is horizontally opened on the guide seat 10. One end of the guide rod 11 is slidably disposed in the sliding hole, and the other end of the guide rod 11 is fixedly connected to the slider 9. This allows the guide rod 11 to move left and right with the slider 9 and the outer limiting clamp 7, and to be guided by the guide seat 10.

[0024] A return spring 12 is sleeved on the guide rod 11. The return spring 12 is located between the guide seat 10 and the slider 9, so that the slider 9 is subjected to a spring force toward the spindle 6. In the initial state, under the action of the return spring 12, the two limit clamps move closer to each other and form a preliminary clamp and pre-position on the dust cover 15.

[0025] The outer surface of the outer limiting clamp 7 has a tapered shape that gradually expands from top to bottom and is provided with external threads. The threaded collar 8 is threadedly connected to the outer surfaces of the two outer limiting clamps 7. During the downward rotation of the threaded collar 8, a self-guiding wedging effect is generated, tightening the two outer limiting clamps 7 and clamping and limiting the lower end of the dust cover 15 between the outer limiting clamps 7 and the spindle 6. When loading the dust cover 15, the threaded collar 8 should be put on the dust cover and placed on the outer limiting clamps 7 in advance.

[0026] Furthermore, such as Figure 4 The inner surface of the outer limiting clamp 7 is fixed with a flexible inner liner 13, and the outer surface of the mandrel 6 is fixed with a flexible outer sleeve 14. The inner wall of the flexible inner liner 13 is adapted to the outer contour shape of the dust cover 15, and the outer wall of the flexible outer sleeve 14 is adapted to the inner contour shape of the dust cover 15. When the clamping is completed, the lower end of the dust cover 15 is limited between the flexible outer sleeve 14 and the flexible inner liner 13 to reduce damage to the pleated structure of the dust cover 15.

Claims

1. A testing device for automotive dust covers, comprising a test frame (1), a lifting platform (2), an upper clamp (3), and a lower clamp (4); The test frame (1) is equipped with a lifting platform (2) that moves vertically via a lifting mechanism; The upper clamp (3) is fixedly installed on the top of the test frame (1) to clamp and fix the upper end of the dust cover (15); The lower clamp (4) is fixedly mounted on the lifting platform (2) to clamp and fix the bottom of the dust cover (15); characterized in that: The lower clamp (4) includes a base (5), a spindle (6), an outer limiting clamp (7), and a threaded collar (8); The chassis (5) is detachably mounted in the middle of the lifting platform (2); The spindle (6) is vertically fixed at the center of the chassis (5); The outer limiting clamp (7) is a semi-circular clamp that is adapted to the size of the dust cover (15). The bottom of the outer limiting clamp (7) is slidably mounted on the chassis (5). Two sets of outer limiting clamps (7) are symmetrically arranged on the left and right. The outer surface of the outer limiting clamp (7) has a tapered shape that gradually expands from top to bottom, and is provided with external threads; The threaded collar (8) is threadedly connected to the outer surface of the two outer limit clamps (7), and tightens the two outer limit clamps (7) and clamps and limits the lower end of the dust cover (15) between the outer limit clamps (7) and the spindle (6).

2. The vehicle dust cover testing device according to claim 1, characterized in that: The outer wall of the outer limiting clamp (7) is fixedly connected to a slider (9), and the chassis (5) is provided with a groove (501) that is adapted to the slider (9).

3. The vehicle dust cover testing device according to claim 2, characterized in that: It also includes a guide seat (10) and a guide rod (11), The guide seat (10) is fixed on the chassis (5) and located on the left and right sides of the outer limiting clamp (7). A through sliding hole is horizontally opened on the guide seat (10). One end of the guide rod (11) is slidably disposed in the sliding hole, and the other end of the guide rod (11) is fixedly connected to the slider (9).

4. The vehicle dust cover testing device according to claim 3, characterized in that: A return spring (12) is sleeved on the guide rod (11). The return spring (12) is located between the guide seat (10) and the slider (9), so that the slider (9) is subjected to a spring force toward the spindle (6).

5. A dust cover testing device for automobiles according to any one of claims 1-4, characterized in that: The inner surface of the outer limiting clamp (7) is fixed with a flexible inner liner (13), and the outer surface of the mandrel (6) is fixed with a flexible outer sleeve (14).

6. The vehicle dust cover testing device according to claim 5, characterized in that: The inner wall of the flexible inner liner (13) is adapted to the outer contour shape of the dust cover (15), and the outer wall of the flexible outer jacket (14) is adapted to the inner contour shape of the dust cover (15).

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