A spring durability testing device

Abstract

This utility model relates to a spring testing device, and more particularly to a spring durability testing device. A spring durability testing device includes a base fixedly installed on a test bench. A cylinder for driving the reciprocating motion of a lifting plate is installed on top of the base. The bottom of the lifting plate has multiple protrusions for positioning the upper end of the spring. The bottom of the base has a limiting block with the same number of protrusions. The limiting block has a concave limiting groove in its center, used to limit the lower end of the spring. The base of this spring durability testing device includes an upper plate and a lower plate, and the lifting plate is guided by a guide rod and guide sleeve. Limiting posts and buffer pads at their top ends are provided at both ends of the device. A top rod and a lower buffer gas spring are arranged between the limiting posts to form a graded buffer system. An upper buffer gas spring is also installed on the upper plate. The limiting blocks are threadedly connected to the lower plate and can be fitted with a guide cylinder. A lifting rod and a limiting ring are provided inside the guide cylinder, with a groove at its top engaging with a protrusion. A spring is arranged between the limiting ring and the bottom of the guide cylinder.

Description

Technical Field

[0001] This utility model relates to a spring testing device, and more particularly to a spring durability testing device. Background Technology

[0002] Current spring durability testing devices generally employ mechanical reciprocating loading, primarily using hydraulic cylinders or motors to drive pressure plates to apply loads to the springs. Traditional devices have the following limitations: Insufficient positioning accuracy: Most testing machines use a flat pressure plate to directly compress the spring with the base, which lacks a precise positioning structure for the spring end. This can easily cause the spring to deflect during the test, affecting the accuracy of the test.

[0003] The buffering mechanism is too simple: relying solely on passive shock-absorbing components such as rubber pads makes it difficult to effectively absorb high-frequency impact energy, and long-term testing can easily cause the equipment structure to loosen.

[0004] Poor adjustment flexibility: The limit structure is mostly fixed, which cannot adapt to the testing requirements of springs of different specifications. The equipment needs to be repeatedly adjusted when replacing springs.

[0005] In view of the above-mentioned shortcomings, the designer has actively researched and innovated in order to create a spring durability testing device that has greater industrial application value. Utility Model Content

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a spring durability testing device.

[0007] This utility model discloses a spring durability testing device, which includes a base fixedly installed with a test bench. A cylinder for driving the reciprocating motion of a lifting plate is installed on the top of the base. The bottom of the lifting plate has multiple protrusions for positioning the upper end of the spring. The bottom of the base has a limiting block with the same number of protrusions. The limiting block has a concave limiting groove in the middle, which is used to limit the lower end of the spring.

[0008] The spring durability testing device mainly consists of a base, a lifting plate, a cylinder, a protrusion, a limiting block, and a limiting groove. The base includes an upper plate and a lower plate, and the lifting plate is guided by a guide rod and a guide sleeve. The device has limiting posts at both ends and buffer pads at their top. A top rod is arranged between the limiting posts to form a graded buffer system with the lower buffer gas spring. The upper plate is also equipped with an upper buffer gas spring. The limiting block is connected to the lower plate by a thread and can be used to install a guide cylinder. The guide cylinder has a lifting rod and a limiting ring inside, and its top groove cooperates with the protrusion. A spring is set between the limiting ring and the bottom of the guide cylinder.

[0009] Furthermore, the base includes an upper plate and a lower plate, with guide rods installed at the four corners of the upper and lower plates, and guide sleeves fitted onto the guide rods at the four corners of the lifting plate.

[0010] The base consists of an upper plate and a lower plate, with guide rods installed at the four corners of both. The four corners of the lifting plate are equipped with guide sleeves fitted onto the guide rods, enabling the lifting plate to move smoothly back and forth along the guide rods.

[0011] Furthermore, there are limit posts at both ends of the lower plate, and the upper end of the limit post can contact the lower edge of the lifting plate.

[0012] Limiting posts are provided at both ends of the lower plate, and the upper end of the limiting post can contact the lower edge of the lifting plate to form a mechanical limiting structure.

[0013] Furthermore, there are two limit posts on each side, and each limit post is equipped with a soft cushioning pad at its top.

[0014] A soft buffer pad is installed at the top of the limiting post to reduce the impact force and noise when the lifting plate comes into contact with the limiting post.

[0015] Furthermore, there is a top rod between the two limiting posts, and buffer gas springs are located at both ends of the lifting plate above the top rod. The telescopic rod of the lower buffer gas spring can contact the top rod. When the lifting plate moves down, the telescopic rod of the lower buffer gas spring contacts the top rod first, and then the lower edge of the lifting plate contacts the buffer pad.

[0016] A top rod is installed between the two limiting posts. Buffer gas springs are installed at both ends of the lifting plate above the top rod. The telescopic rod of the lower buffer gas spring can contact the top rod. When the lifting plate moves down, the telescopic rod of the lower buffer gas spring first contacts the top rod, and then the lower edge of the lifting plate contacts the buffer pad, forming a two-stage buffer protection mechanism.

[0017] Furthermore, an upper buffer gas spring is installed on the upper plate, and the telescopic rod of the upper buffer gas spring can contact the upper edge of the lifting plate.

[0018] The upper plate is equipped with an upper buffer gas spring. The extension rod of the upper buffer gas spring can contact the upper edge of the lifting plate. When the lifting plate rises, the extension rod of the upper buffer gas spring contacts the lifting plate first, forming a buffer protection. Together with the lower buffer gas spring, it forms a complete two-way buffer system.

[0019] Furthermore, the outer ring of the limit block has threads, and the lower plate has threaded holes for installing the limit block.

[0020] The limit block is installed and fixed on the lower plate by a threaded connection. The corresponding limit block can be quickly replaced as needed, and the spring to be tested can be installed on the lower plate.

[0021] Furthermore, a guide cylinder is fixed to the limiting block by bolts, and a top cover is fixed to the top of the guide cylinder by bolts. A lifting rod is installed inside the guide cylinder, and the bottom of the lifting rod is a limiting ring that protrudes outward. A return spring is placed between the limiting ring and the bottom of the guide cylinder. The top cover has a through hole for the lifting rod to pass through, and the top of the lifting rod has a groove that matches the protrusion.

[0022] The limit block is fixed to the guide cylinder by bolts. The top of the guide cylinder is bolted to the cover. The lifting rod is installed inside the cylinder and has a limit ring at its bottom. A reset spring is installed between the limit ring and the bottom of the guide cylinder. The cover has a through hole for the lifting rod to pass through. The top of the lifting rod is machined with a groove that matches the protrusion, forming a precision guide mechanism with automatic reset function. During spring testing, it provides guidance for the extension and contraction of the spring and avoids the spring from deflecting.

[0023] By employing the above-described scheme, the present invention has at least the following advantages: the spring end is precisely positioned by the precise nesting of the protrusion and the limiting groove on the limiting block, effectively preventing test skew; the guide rod and guide sleeve ensure the vertical movement of the lifting plate; the combination of a two-way graded buffering mechanism (the upper buffer gas spring pre-buffers the upward impact, and the lower buffer gas spring and buffer pad form a two-stage downward buffer) significantly reduces impact damage; the threaded limiting block facilitates quick replacement to adapt to different springs; the integrated guide cylinder and lifting rod with a return spring have a top groove that dynamically engages with the protrusion, providing anti-eccentric load guidance for the spring; the whole system achieves high-precision positioning, flexible impact resistance, flexible adjustment, and long-term stable operation, greatly improving testing efficiency and reliability.

[0024] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a utility model Figure 1 Another perspective illustration; Figure 3 This is a cross-sectional view of the guide cylinder installed on the limiting block of this utility model and the internal structure of the guide cylinder; In the diagram: 1. Base; 2. Lifting plate; 3. Cylinder; 4. Protrusion; 5. Limiting block; 6. Limiting groove; 7. Upper plate; 8. Lower plate; 9. Guide rod; 10. Guide sleeve; 11. Limiting post; 12. Buffer pad; 13. Top rod; 14. Lower buffer gas spring; 15. Upper buffer gas spring; 16. Guide cylinder; 17. Upper cover; 18. Lifting rod; 19. Limiting ring; 20. Return spring. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0028] See Figure 1 and Figure 2 The spring durability testing device is fixed to the test bench via a base 1. A cylinder 3 drives a lifting plate 2 to achieve precise reciprocating motion. The protrusion 4 at the bottom of the lifting plate 2 and the limiting groove 6 of the limiting block 5 form a double-end positioning structure to ensure that the spring remains vertically aligned during testing. The device uses a guide rod 9 and a guide sleeve 10 to ensure the stability of the lifting plate 2's movement trajectory. The limiting post 11 and its buffer pad 12 constitute the end mechanical limit, which, together with the top rod 13 and the lower buffer gas spring 14, forms a two-stage buffer protection. The upper buffer gas spring 15 achieves upward buffering. The threaded limiting block 5 facilitates quick replacement to adapt to different springs. The integrated guide cylinder 16 and the lifting rod 18 with a return spring 20 provide dynamic anti-eccentric load function. The overall design achieves three core advantages: high-precision positioning, flexible buffering, and multi-specification adaptation. It effectively solves the problems of skewness, impact damage, and inconvenient adjustment in traditional testing devices, significantly improving testing efficiency and data reliability.

[0029] The base 1 adopts a stable frame structure of upper plate 7 and lower plate 8. The guide rods 9 set at the four corners and the guide sleeves 10 at the four corners of the lifting plate 2 form a precision guiding system to ensure that the lifting plate 2 has no deviation when it achieves vertical reciprocating motion under the drive of the cylinder. The cooperative design of the guide rods 9 and guide sleeves 10 makes the motion trajectory of the lifting plate 2 highly consistent, eliminating the motion deviation problem common in traditional testing devices, so that the spring is always in an ideal stress state during the test, significantly improving the accuracy and repeatability of the test data. At the same time, the guide rod and guide sleeve structure has wear-resistant properties, which can ensure the motion accuracy under long-term use.

[0030] Limiting posts 11 are provided at both ends of the lower plate 8. A reliable mechanical limiting structure is formed by the contact between the upper end of the limiting post 11 and the lower edge of the lifting plate 2. The advantage of this design is that when the cylinder 3 drives the lifting plate 2 to reciprocate, the limiting post 11 can accurately control the downward limit position of the lifting plate 2, preventing overshoot from causing equipment damage or test data distortion. At the same time, the rigid contact characteristics of the limiting post 11 ensure the accuracy and repeatability of positioning, providing stable boundary conditions for spring testing.

[0031] Two limiting posts 11 are set on one side, and each limiting post 11 is equipped with a soft buffer pad 12 at its top. This symmetrical arrangement of the two posts, combined with the buffer structure, ensures that when the lifting plate 2 descends to its limit position, the two limiting posts 11 contact the lifting plate 2 simultaneously through the buffer pad 12, thus ensuring both force balance and flexible buffering. The buffer pad 12 effectively absorbs impact energy, significantly reduces equipment operating noise, and extends the service life of key components such as the cylinder 3. Compared with the single-post design, the double limiting post 11 structure has a higher resistance to eccentric loads. Even if the lifting plate 2 is slightly tilted, it can ensure the reliability of the buffer contact. This design is particularly suitable for high-frequency, long-term spring durability testing conditions, which greatly improves the overall durability of the equipment while ensuring testing accuracy.

[0032] A top rod 13 is installed between the two limiting posts 11. Lower buffer gas springs 14 are installed at both ends of the lifting plate 2 above the top rod 13, forming a two-stage buffer system. When the lifting plate 2 moves down, the telescopic rod of the lower buffer gas spring 14 first contacts the top rod 13 to form the first stage of buffering, absorbing most of the impact energy through the damping characteristics of the gas spring. Then, the lower edge of the lifting plate 2 contacts the buffer pad 12 on the limiting post 11 to complete the second stage of flexible limiting. This staged buffering mechanism ensures the stability of the equipment operation and greatly reduces the instantaneous impact load. The top rod 13, as an intermediate force transmission component, evenly transmits the buffering effect of the lower buffer gas spring 14 to the entire lifting plate 2, forming a three-dimensional buffer network with the original double limiting post 11 structure, so that the equipment can maintain positioning accuracy and effectively protect the mechanical structure during long-term high-frequency testing.

[0033] When the lifting plate 2 rises to its limit position, the telescopic rod of the upper buffer gas spring 15 contacts the upper edge of the lifting plate 2 to form an upward buffer, which, together with the original lower buffer gas spring 14, constitutes a complete two-way buffer protection. The upper buffer gas spring 15 effectively absorbs the kinetic energy impact at the end of the upward movement of the lifting plate 2 through progressive damping, which not only avoids equipment damage caused by rigid collisions, but also ensures the accuracy of the positioning of the lifting plate 2 during the test. This symmetrical buffer layout ensures that the equipment maintains stable operation during high-speed reciprocating motion.

[0034] The threaded connection method ensures the firmness of the limit block 5 installation and facilitates disassembly, maintenance, or replacement of limit blocks 5 of different specifications. The limit block 5 can be quickly installed on the lower plate 8, and different limit blocks 5 can be selected according to the spring to be tested.

[0035] See Figure 3The limiting block 5 is fixed to the guide cylinder 16 by bolts to form a rigid support structure. The top of the guide cylinder 16 is connected to the top cover 17 by bolts to form a closed guide cavity. Inside, the limiting ring 19 at the bottom of the lifting rod 18 and the bottom of the guide cylinder 16 are set with a return spring 20 to form an automatic return mechanism. The design advantages of this modular guide system are: when the groove at the top of the lifting rod 18 cooperates with the protrusion 4 of the lifting plate 2, the guide cylinder 16 ensures that the lifting rod 18 maintains a vertical movement trajectory; the return spring 20 continuously provides a stable rebound force during the test, so that the lifting rod 18 always maintains reliable contact with the protrusion 4; the through hole of the top cover 17 not only restricts the movement range of the lifting rod 18, but also prevents foreign objects from entering the guide cylinder 16; the cooperation between the limiting ring 19 and the bottom of the guide cylinder 16 forms a mechanical hard limit, which, together with the elastic buffer of the return spring 20, constitutes a double protection mechanism, so that the guide system can ensure motion accuracy and effectively reduce wear in long-term high-frequency testing, and is particularly suitable for heavy-duty spring testing environments that require precise guidance.

[0036] The working principle of this utility model is as follows: When using this spring durability testing device, the first step is to remove the limiting block 5 from the lower plate 8 by rotating it. The spring to be tested is then placed on the outside of the guide cylinder 16, with the lower end of the spring in contact with the limiting block 5. The limiting block 5 is then screwed into the screw hole of the lower plate 8, and the groove at the top of the lifting rod 19 mates with the protrusion 4 below the upper plate 7. At this point, the installation of the spring to be tested is complete. The lifting rod 19 can move up and down within the guide cylinder 16, and the return spring 20 provides the upward reset force. During testing, the cylinder 3 reciprocates to drive the lifting plate 2 up and down, repeatedly pressing the spring to be tested. The guide cylinder 16 provides lateral guidance for the spring to be tested, preventing uneven force on the spring during testing, which could cause the spring to pop out of the test position.

[0037] When the lifting rod 18 is lowered to its lowest position, the height of its upper end should be lower than the upper edge of the buffer pad 12, providing sufficient room for movement of the spring extension and contraction to be tested.

[0038] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A spring durability testing device, comprising a base (1) fixedly mounted to a test bench, characterized in that: A cylinder (3) for driving the lifting plate (2) to reciprocate is installed on the base (1). The bottom of the lifting plate (2) has multiple protrusions (4) for positioning the upper end of the spring. The bottom of the base (1) has a limiting block (5) with the same number of protrusions (4). The middle of the limiting block (5) has a recessed limiting groove (6). The limiting groove (6) is used to limit the lower end of the spring. The base (1) includes an upper plate (7) and a lower plate (8). Guide rods (9) are installed at the four corners of the upper plate (7) and the lower plate (8). Guide sleeves (10) are fitted on the guide rods (9) at the four corners of the lifting plate (2). There are limit posts (11) at both ends of the lower plate (8), and the upper end of the limit post (11) can contact the lower edge of the lifting plate (2); There are two limit posts (11) on one side, and a soft buffer pad (12) is installed at the top of each limit post (11). There is a top rod (13) between the two limiting posts (11). The two ends of the lifting plate (2) are above the top rod (13) and there are buffer air springs (14). The telescopic rod of the lower buffer air spring (14) can contact the top rod (13). When the lifting plate (2) moves down, the telescopic rod of the lower buffer air spring (14) first contacts the top rod (13), and then the lower edge of the lifting plate (2) contacts the buffer pad (12). An upper buffer gas spring (15) is installed on the upper plate (7), and the telescopic rod of the upper buffer gas spring (15) can contact the upper edge of the lifting plate (2).

2. The spring durability testing device according to claim 1, characterized in that: The outer ring of the limiting block (5) has threads, and the lower plate (8) has threaded holes for installing the limiting block (5).

3. The spring durability testing device according to claim 2, characterized in that: A guide cylinder (16) is fixed to the limiting block (5) by bolts. A top cover (17) is fixed to the top of the guide cylinder (16) by bolts. A lifting rod (18) is installed inside the guide cylinder (16). The bottom of the lifting rod (18) is a limiting ring (19) that protrudes outward. A return spring (20) is placed between the limiting ring (19) and the bottom of the guide cylinder (16). The top cover (17) has a through hole for the lifting rod (18) to pass through. The top of the lifting rod (18) has a groove that matches the protrusion (4).

Images