A spring compression testing device

Abstract

This invention provides a spring compression testing device, belonging to the technical field of spring testing equipment. The device includes a compression fixture body, a guide and limiting assembly, and at least one radial limiting member. The compression fixture body is mounted on the lower clamp of the testing equipment and has an axial compression space inside. The top of the compression space has a limiting structure for compressing the spring. One end of the limiting assembly is fixedly connected to the upper clamp of the testing equipment, and the other end extends through the limiting structure into the compression space to limit the deformation of the spring under test radially. The radial limiting member is detachably mounted on the compression fixture body and extends into or through the compression space. The portion extending into the compression space is arranged on one side of the guide and limiting assembly to limit the swaying of the spring under test placed on the guide and limiting assembly radially. This invention primarily addresses the technical problems in the prior art where clamping is difficult, stability is poor, and spring bending is easily caused during compression testing of small-diameter, long springs.

Description

Technical Field

[0001] This invention belongs to the technical field of spring testing equipment, and specifically relates to a spring compression testing device. Background Technology

[0002] As an important elastic element, springs play an indispensable role in many fields due to their unique elastic deformation capabilities. The mechanical properties of springs, especially the relationship between compressive force and compression, directly determine the working accuracy, reliability, and service life of the products in which they are used. Therefore, accurate testing of spring compression performance is crucial in the production, selection, and application of springs.

[0003] Currently, the industry primarily relies on two methods to measure the compression force and amount of spring compression. The first is manual inspection, which typically involves operators using simple tools such as rulers and calipers to measure the length of the spring before and after compression. Force is then applied manually or using a simple lever device, and the force value is read based on personal experience or a simple force gauge. This traditional method requires no complex equipment and is relatively inexpensive, still finding some application in small workshops or scenarios where high testing accuracy is not required. However, manual inspection has several insurmountable drawbacks: firstly, the application of force during the pressing process is entirely manual, leading to uneven force, potential deviations in the direction of force, and reliance on subjective judgment when reading the force, resulting in significant measurement errors and failing to objectively and accurately reflect the true mechanical properties of the spring; secondly, manual inspection is inefficient, making it difficult to meet the testing needs of mass production scenarios, and prolonged repetitive operations can easily lead to operator fatigue, further exacerbating measurement errors.

[0004] Another method is to use a professional compression testing machine (i.e., testing equipment) for direct compression measurement. This type of equipment, through its precise mechanical structure, sensors, and control system, can achieve accurate control and data acquisition of force and displacement. The testing accuracy and efficiency are significantly improved compared to manual inspection, making it the mainstream choice for medium and large enterprises and high-precision spring testing. However, existing compression testing machines still have significant limitations in practical applications, especially for special-specification springs with small diameters and long dimensions. Because the clamping design of conventional compression testing machines is mainly adapted to springs with larger diameters and shorter lengths, it is difficult to reliably fix springs with small diameters (usually less than 5mm) and long lengths (length to diameter ratio greater than 10). On the one hand, the spring diameter is too small, and current clamps mainly clamp from the outside of the spring. However, the clamping surface of existing clamps is difficult to form effective contact with the spring, resulting in insecure clamping and easy slippage, displacement, and radial deformation during compression. On the other hand, the spring length is long and its rigidity is weak, making it prone to bending and tipping during compression. This not only prevents normal testing but may also damage the spring or cause equipment jamming. In addition, some customized testing equipment for special springs has a complex structure, large size, high manufacturing and maintenance costs, poor versatility, and is difficult to promote and apply widely in the industry.

[0005] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0006] The purpose of this invention is to provide a spring compression testing device to solve the technical problems existing in the prior art, such as difficulty in clamping, poor stability, and easy bending or tipping of springs when performing compression tests on small-diameter, long-length springs.

[0007] To achieve the above objectives, the spring compression testing device of the present invention provides the following technical solution: A spring compression testing device, comprising: A compression fixture body is used to be mounted on the lower clamp of the testing equipment. It has an axial compression space inside and a limiting structure for compressing the spring at the top of the compression space. A guide limiting component, one end of which is fixedly connected to the upper clamp of the testing equipment, and the other end extends through the limiting structure into the compression space to limit the deformation of the spring under test in the radial direction; At least one radial limiting member is detachably mounted on the compression fixture body and extends into or through the compression space, with the portion extending into the compression space arranged on one side of the guide limiting assembly to limit the swaying of the spring to be tested placed on the guide limiting assembly in the radial direction. During the compression spring test, the spring is sleeved on one end of the guide limiting assembly that extends into the compression space. The guide limiting assembly is pulled outward relative to the compression space, and the guide limiting assembly drives one end of the spring to press against the limiting structure to perform axial compression deformation.

[0008] As a further optimized technical solution, the guide limiting assembly includes a guide rod and a positioning component. One end of the guide rod is fixedly connected to the upper clamp of the testing equipment, and the other end extends into the compression space. The positioning component is coaxially fixedly installed at the end of the guide rod that extends into the compression space, and its diameter is larger than that of the guide rod, for axially supporting one end of the test spring.

[0009] As a further optimized technical solution, the positioning member has at least two stepped surfaces with different diameters, the diameter of which gradually increases from the side facing the spring to the side away from the spring.

[0010] As a further optimized technical solution, the radial limiting member is a limiting pin, and the side wall of the compression fixture body is provided with an installation hole communicating with the compression space. The limiting pin can be inserted into the installation hole to penetrate deep into the compression space.

[0011] As a further optimized technical solution, the limiting pin is arranged in a direction perpendicular to the guide rod.

[0012] As a further optimized technical solution, the main body of the compression tooling is a frame structure, and the internal space of the frame structure constitutes the compression space.

[0013] As a further optimized technical solution, the frame structure is provided with fixing parts on two opposite side walls for matching with the lower clamp of the testing equipment.

[0014] As a further optimized technical solution, the fixing part is a groove or flange structure.

[0015] As a further optimized technical solution, one end of the guide rod fixing positioning member extends out of the positioning member by a set distance to form a positioning section, and the bottom of the compression space has a positioning structure for accommodating the positioning section.

[0016] As a further optimized technical solution, the positioning structure is a positioning groove whose width is adapted to the diameter of the positioning section.

[0017] Beneficial Effects: The spring compression testing device provided by this invention achieves reliable limiting and stable testing of small-diameter, long-length springs through the cooperation of the compression fixture body, guide limiting component, and radial limiting component. The guide limiting component provides radial support from inside the spring, preventing radial deformation and bending during spring compression. The radial limiting component further restricts the radial wobble of the spring, improving the stability of the testing process. The compression fixture body is compatible with the upper and lower clamps of existing testing equipment, eliminating the need for customized testing equipment and reducing operating costs. The entire device does not rely on complex electromechanical systems and is mainly composed of mechanical structural parts, making it simple to manufacture and cost-effective. It can be used with general-purpose tensile testing machines (universal testing machines) as testing equipment without requiring modifications to expensive main equipment, greatly reducing the testing threshold and costs for users and facilitating widespread application in the industry.

[0018] Furthermore, by designing positioning components with multi-level stepped surfaces, various slender springs of different specifications can be adapted, improving the utilization rate and economy of the equipment, while ensuring the stability of the spring under test. The fit between the positioning groove and the positioning section further ensures the positioning accuracy during initial installation and improves the repeatability of the test. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of the overall assembly of one embodiment of the spring compression testing device of the present invention; Figure 2 This is a schematic diagram of the compression fixture body of one embodiment of the spring compression testing device of the present invention; Figure 3 This is a schematic diagram of the positioning component structure of one embodiment of the spring compression testing device of the present invention; Figure 4 This is a schematic diagram of the installation of the limit pin in one embodiment of the spring compression testing device of the present invention; Figure 5 This is a schematic diagram of the working state of an embodiment of the spring compression testing device of the present invention.

[0020] In the diagram: 100, main body of the compression fixture; 110, compression space; 120, limiting structure; 130, mounting hole; 140, fixing part; 150, positioning groove; 200, lower clamp of the testing equipment; 300, spring; 400, guide rod; 410, positioning section; 500, positioning component; 600, upper clamp of the testing equipment; 700, limiting pin. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0022] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, the term "proximal end" uniformly refers to the end closer to the operator, while "distal end" refers to the end farther from the operator.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0024] The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions of the product; they are only intended to illustrate the content of the invention.

[0025] To address the technical problems in existing technologies regarding the difficulty of clamping, poor stability, and easy bending or tipping of springs during compression testing of small-diameter, long-length springs, this invention provides a spring compression testing device. The device includes a compression fixture body 100, a guide and limiting assembly, and at least one radial limiting member. The compression fixture body 100 is disposed on the lower clamp 200 of the testing equipment, has an internal axial compression space 100, and a limiting structure 120 at one end. One end of the guide and limiting assembly is connected to the upper clamp 600 of the testing equipment, and the other end extends into the compression space 110 to radially limit the spring 300. The radial limiting member is detachably installed on the compression fixture body 100 and extends into or through the compression space 110 to restrict the radial sway of the spring 300. During testing, the spring 300 is fitted onto the guide and limiting assembly, and the upper clamp 600 of the testing equipment pulls the guide and limiting assembly, driving the spring 300 to press against the limiting structure 120 to complete axial compression. This invention has a simple structure, low cost, and convenient operation. It can effectively ensure the stability of slender springs during the testing process and significantly improve the reliability and accuracy of test data.

[0026] Example 1 like Figure 1As shown, the spring compression testing device includes a compression fixture body 100, a guide and limiting assembly, and at least one radial limiting component.

[0027] The compression fixture body 100 is mounted on the lower clamp 200 of a testing device (such as a common professional compression testing machine). It has an axial compression space 110 inside, and a limiting structure 120 at the top of the compression space 110 for compressing the spring 300. In this embodiment, the compression fixture body 100 is a quadrilateral frame structure. The interior of the frame structure forms a vertical compression space 110 with a rectangular cross-sectional area, and the top wall of the frame structure forms the aforementioned limiting structure 120. Fixing portions 140 are provided on the opposite sidewalls of the left and right sides of the frame structure. The fixing portions 140 are grooves or flanges that can be adapted to the lower clamp 200 of the testing device to achieve stable fixation of the compression fixture body 100 and prevent displacement during testing.

[0028] like Figure 2 , Figure 3 As shown, the upper end of the guide limiting assembly is fixedly connected to the upper clamp 600 of the testing equipment, and the lower end extends through the limiting structure 120 into the compression space 110 to limit the deformation of the spring 300 under test in the radial direction. In this embodiment, the guide limiting assembly includes a guide rod 400 and a positioning member 500. One end of the guide rod 400 is fixedly connected to the upper clamp 600 of the testing equipment, and the other end extends into the compression space 110 through a groove in the limiting structure 120. The positioning member 500 is coaxially fixedly mounted on the guide rod 400. One end of the positioning member 500 extends into the compression space 110 and has a diameter larger than that of the guide rod 400, serving to axially support one end of the test spring 300. The positioning member 500 has at least two stepped surfaces with different diameters, the diameter of which gradually increases from the side facing the spring 300 to the side away from the spring 300, accommodating springs 300 with different inner diameters to improve the versatility of the device. In addition, the bottom end of the spring 300 is fitted onto a step with a similar inner diameter, which can further fix the spring 300 from the bottom and reduce the radial wobble of the spring 300. One end of the guide rod 400 that fixes the positioning member 500 extends out of the positioning member 500 by a set distance to form a positioning section 410. The bottom of the compression space 110 is provided with a positioning groove 150, the width of which is adapted to the diameter of the positioning section 410. During the test assembly process, the positioning section 410 can be embedded in the positioning groove 150 to further improve the stability of the guide limiting component and prevent guide deviation. It should be noted here that the guide rod 400 can be a rigid rod-like structure that does not have bending characteristics in the axial direction, or it can be a structure that can be flexibly bent (in which case it can also be a rope-like structure or a filament-like structure). Its main function is to cooperate with the limiting structure 120 to compress the spring 300 when the test equipment is stretched. Therefore, the axial hardness characteristics of the guide rod 400 are not specifically limited.

[0029] Furthermore, the positioning groove 150 and the groove on the limiting structure 120 are aligned vertically and the groove openings face the same side, which facilitates the placement of the guide limiting assembly on which the spring 300 is installed.

[0030] like Figure 1 , Figure 4 As shown, in this embodiment, the radial limiting component is a limiting pin 700. Mounting holes 130 communicating with the compression space 110 are respectively provided on the two side walls of the compression fixture body 100. The limiting pin 700 can be inserted into the mounting hole 130, penetrating the compression space 110. The limiting pin 700 is arranged in a direction perpendicular to the guide rod 400, with the portion extending into the compression space 110 located on one side of the guide limiting assembly. This is used to radially limit the swaying of the test spring 300 placed on the guide limiting assembly, preventing radial displacement and swaying of the spring 300 during compression. In other embodiments, multiple limiting pins 700 can be provided, and each limiting pin 700 can also partially extend into the compression space 110.

[0031] The working process of this invention is as follows: Before testing, assembly is performed. The spring 300 to be tested is inserted from above the guide rod 400 and allowed to slide down until its lower end is securely seated on the step surface of the positioning component 500 that best matches its inner diameter. Then, this spring-installed guide and limiting assembly is vertically placed into the compression space 110 of the compression fixture body 100, ensuring that the positioning section 410 at the lower end of the guide rod 400 falls into the positioning groove 150 at the bottom. This step ensures the initial alignment of the entire assembly within the compression space. Finally, two limiting pins 700 are inserted into the mounting holes 130 from both sides. The portion of the limiting pin 700 extending into the compression space 110 should be close to but not tightly pressing against the outer ring of the spring 300. Its main function is to provide mechanical resistance when the spring may swing laterally at a large amplitude, preventing it from touching the inner wall of the compression space 110 or becoming unstable.

[0032] Next, the compression fixture body 100 is securely mounted onto the lower clamp 200 of the testing equipment via its fixing part 140 (groove) and locked. Then, the upper clamp 600 of the testing equipment is operated to clamp the upper end of the guide rod 400. At this point, the device installation is complete.

[0033] Finally, the testing machine is started, and the upper clamp 600 of the testing equipment is controlled to move upward at a constant speed. Since the lower end of the spring 300 is "pulled" by the positioning element 500 and the guide rod 400, while the upper end is "supported" by the limiting structure 120 of the compression fixture body 100, the spring 300 is actually stretched axially from both ends within a confined space, thus achieving stable axial compression deformation (e.g., ...). Figure 5(As shown). Throughout the process, the guide rod 400 ensures the spring moves in a straight line, the limit pin 700 suppresses its radial wobble, and the compression space 110 prevents it from tipping over. The testing machine system records the tension (i.e., spring compression force) and displacement (i.e., spring compression amount) applied by the upper clamp 600 of the testing equipment in real time with high precision, and finally generates an accurate spring compression mechanical property curve.

[0034] In summary, the spring compression testing device provided by this invention effectively solves the problems of easy deformation and shaking when testing small-diameter, long-sized springs through the dual cooperation of internal guide limit and external radial limit. At the same time, it is compatible with existing testing equipment, has strong versatility, simple structure, and convenient operation, and can significantly improve the accuracy and efficiency of spring compression testing and reduce testing costs.

[0035] It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are within the protection scope of the present invention.

Claims

1. A spring compression testing device, characterized in that, include: Compression fixture body (100), the compression fixture body (100) is used to be set on the lower clamp (200) of the test equipment, and has an axial compression space (110) inside, and a limiting structure (120) for clamping spring (300) at the top of the compression space (110). A guide limiting component, one end of which is fixedly connected to the upper clamp (600) of the test equipment, and the other end extends through the limiting structure (120) into the compression space (110) to limit the deformation of the spring (300) to be tested in the radial direction; At least one radial limiting member is detachably mounted on the compression fixture body (100) and extends into or through the compression space (110), with the portion extending into the compression space (110) arranged on one side of the guide limiting assembly for radially limiting the sway of the spring (300) to be tested placed on the guide limiting assembly. During the compression spring (300) test, the spring (300) is sleeved on one end of the guide limiting assembly that extends into the compression space (110). The guide limiting assembly is pulled outward relative to the compression space (110), and the guide limiting assembly drives one end of the spring (300) to press against the limiting structure (120) for axial compression deformation.

2. The spring compression testing device according to claim 1, characterized in that, The guide limiting assembly includes a guide rod (400) and a positioning element (500). One end of the guide rod (400) is fixedly connected to the upper clamp (600) of the testing equipment, and the other end extends into the compression space (110). The positioning element (500) is coaxially fixedly disposed at the end of the guide rod (400) that extends into the compression space (110), and its diameter is larger than that of the guide rod (400), and is used to axially support one end of the receiving spring (300).

3. The spring compression testing device according to claim 2, characterized in that, The positioning element (500) has at least two stepped surfaces of different diameters, with the diameter of the stepped surfaces gradually increasing from the side facing the spring (300) to the side away from the spring (300).

4. The spring compression testing device according to claim 1, characterized in that, The radial limiting component is a limiting pin (700). The side wall of the compression fixture body (100) is provided with an installation hole (130) that communicates with the compression space (110). The limiting pin (700) can be inserted into the installation hole (130) to penetrate the compression space (110).

5. The spring compression testing device according to claim 4, characterized in that, The limiting pin (700) is arranged in a direction perpendicular to the guide rod (400).

6. The spring compression testing device according to claim 1, characterized in that, The main body (100) of the compression tooling is a frame structure, and the internal space of the frame structure constitutes the compression space (110).

7. The spring compression testing device according to claim 6, characterized in that, The frame structure has fixing parts (140) on its two opposite side walls for matching the lower clamp (200) of the test equipment.

8. The spring compression testing device according to claim 7, characterized in that, The fixing part (140) is a groove or flange structure.

9. The spring compression testing device according to claim 2, characterized in that, The guide rod (400) extends one end of the fixed positioning member (500) by a set distance to form a positioning section (410), and the bottom of the compression space (110) has a positioning structure for accommodating the positioning section (410).

10. The spring compression testing device according to claim 9, characterized in that, The positioning structure is a positioning groove (150) whose width is adapted to the diameter of the positioning section (410).

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