Exhaust valve test fixture

Abstract

The utility model provides a kind of exhaust valve test tool, including fixed base, installation platform and exhaust valve, opening is opened in installation platform, and elastic pressure module is equipped with in fixed base inside corresponding opening, and elastic pressure module includes fixed part, and fixed part lower end is equipped with pressure roller assembly, elastic support component in sequence, and elastic support component both sides are equipped with guide seat.The utility model has the beneficial effects: the stable transmission of pressure and the adaptation of vibration environment are realized by the optimized connecting structure, the test precision and product protection are improved by low friction component and guide structure;Force value adjustment is simple and high in accuracy, can avoid force value violent fluctuation, can simulate stable pressure environment.It can reduce local stress concentration, prevent shaft scratch or deformation, protect the integrity of test piece, and the structure is simple, suitable for a variety of vibration test scene.

Description

Technical Field

[0001] This utility model mainly relates to the field of vibration testing technology, specifically to a test fixture for an exhaust valve. Background Technology

[0002] When conducting vibration tests on cargo warehouse exhaust valves, it is necessary to simulate the pressure loads they experience during actual operation to verify the valve's stability and reliability under vibration conditions. In traditional testing, a method of directly loading heavy objects was used to apply a preset pressure to the valve's pivot: weights, metal blocks, or other heavy objects were suspended from the end of the pivot using ropes or rigid connecting rods, utilizing the weight of the objects to generate continuous pressure.

[0003] However, this method has significant drawbacks: First, force adjustment is cumbersome, requiring the increase or decrease of the number of weights to achieve pressure changes, which is time-consuming, has low accuracy, and large errors; second, it has poor dynamic adaptability, during vibration testing, the weights are prone to generate additional impact force due to inertia, resulting in violent fluctuations in the actual force applied to the shaft, with large instantaneous fluctuation amplitudes, making it impossible to simulate a stable pressure environment; third, the rigid connection between the weights and the shaft is prone to causing local stress concentration, which may lead to scratches or deformation on the shaft surface, affecting the integrity of the test piece.

[0004] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art. Utility Model Content

[0005] 1. The technical problem to be solved by the utility model: This utility model provides a test fixture for an exhaust valve to solve the technical problems existing in the background art.

[0006] 2. Technical Solution: To achieve the above objectives, the technical solution provided by this utility model is as follows: a test fixture for an exhaust valve, comprising a fixed base, an installation platform and an exhaust valve, wherein an opening is provided on the installation platform, and an elastic pressure module is provided in the fixed base corresponding to the opening, the elastic pressure module comprising a fixing member, and a pressure roller assembly and an elastic support assembly are sequentially provided at the lower end of the fixing member, and guide seats are provided on both sides of the elastic support assembly.

[0007] Furthermore, the mounting platform and the fixed base are fixedly connected by multiple positioning bolts, and the exhaust valve is installed on the upper end of the mounting platform.

[0008] Furthermore, the upper end of the fixing member is in contact with the rotating shaft of the exhaust valve, and its lower end is arc-shaped and in contact with the pressure roller assembly.

[0009] Furthermore, the pressure roller assembly includes a balance roller, which has multiple positioning grooves. Two pressure roller groups are fitted onto the balance roller, and each pressure roller group includes multiple ball bearings arranged in parallel.

[0010] Furthermore, the elastic support assembly includes a linkage seat, the lower end of which is embedded with multiple compression springs, and the upper end of which has multiple arc-shaped grooves and receiving slots. The balance roller and the pressure roller assembly are respectively embedded in the arc-shaped grooves and the receiving slots.

[0011] Furthermore, the linkage seat and the balance roller are fixed together by locking bolts.

[0012] Furthermore, the two guide seats are respectively disposed on both sides of the linkage seat, and the lower end of the guide seats is fixedly connected to the fixed seat.

[0013] 3. Beneficial effects: Compared with the prior art, the technical solution provided by this utility model has the following advantages: This utility model features a reasonable design. Through an optimized connection structure, it achieves stable pressure transmission and adaptability to vibration environments. Low-friction components and a guiding structure enhance testing accuracy and product protection. Force adjustment is simple and highly accurate, avoiding drastic force fluctuations and stably simulating pressure environments. Its design in conjunction with the exhaust valve's rotating shaft reduces localized stress concentration, prevents shaft scratches or deformation, protects the integrity of the test piece, and its simple structure makes it suitable for various vibration testing scenarios.

[0014] It should be noted that the structures not described in this utility model are the same as or can be implemented using existing technology, and will not be elaborated here, as they do not involve the design points and improvement directions of this utility model. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the elastic pressure application module structure of this utility model; Figure 4 This is an exploded view of the elastic pressure module structure of this utility model.

[0016] Figure label: 1. Fixed base; 2. Mounting platform; 3. Exhaust valve; 4. Elastic pressure module; 401. Fixing component; 402. Pressure roller assembly; 4021. Balance roller; 4022. Pressure roller group; 403. Elastic support assembly; 4031. Linkage seat; 4032. Compression spring component; 4033. Arc groove; 4034. Receiving groove; 404. Guide seat; 5. Positioning bolt. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] See attached document Figure 1-4An exhaust valve testing fixture includes a fixed base 1, an installation platform 2 and an exhaust valve 3. The installation platform 2 has an opening, and the fixed base 1 has an elastic pressure module 4 corresponding to the opening. The elastic pressure module 4 includes a fixing member 401. The lower end of the fixing member 401 is provided with a pressure roller assembly 402 and an elastic support assembly 403 in sequence. The elastic support assembly 403 has guide seats 404 on both sides.

[0022] The mounting platform 2 is horizontally fitted onto the upper surface of the fixed base 1. The two are rigidly fixed by positioning bolts 5 evenly distributed along the edge. The positioning bolts 5 pass through the bolt holes of the mounting platform 2 and the internal threaded holes of the fixed base 1. An elastic washer is installed between the bolt head and the mounting platform 2 to effectively eliminate bolt loosening caused by resonance during vibration testing, ensuring the relative positional accuracy of the mounting platform 2 and the fixed base 1, and providing a stable installation reference for the exhaust valve 3. The opening on the mounting platform 2 corresponds precisely to the position of the elastic pressure module 4 inside the fixed base 1. The opening size is slightly larger than the rotation trajectory of the exhaust valve 3, reserving space for the operation of the elastic pressure module 4 and the exhaust valve 3.

[0023] The upper end of the fixing part 401 is machined with an arc-shaped groove that is adapted to the rotating shaft of the exhaust valve 3. The radius of curvature is consistent with the outer circle of the rotating shaft. It achieves a fit with the rotating shaft through surface contact. The lower end is an arc-shaped convex surface that forms a line contact with the outer circumferential surface of the pressure roller group 22 in the pressure roller assembly 402. This arc-shaped fit design can adaptively adjust the contact angle as the exhaust valve 3 rotates, avoiding pressure fluctuations caused by the rotation of the rotating shaft.

[0024] The upper end face of the balance roller 4021 in the pressure roller assembly 402 has multiple positioning grooves, and two sets of pressure roller groups 4022 are fitted on it. The positioning grooves and pressure roller groups 4022 are arranged alternately. Each set of pressure roller groups 4022 contains 3 parallel ball bearings. The inner ring of the bearing is interference-fitted with the balance roller 4021, and the outer ring can rotate freely. The balance roller 4021 is embedded in the arc-shaped groove 4033 at the upper end of the linkage seat 4031. The curvature of the groove matches the outer circle of the balance roller. The pressure roller group 4022 is correspondingly embedded in the receiving groove 4034 of the linkage seat 4031. The groove depth is slightly greater than the bearing thickness. The linkage seat 4031 and the balance roller 4021 are fixed by locking bolts that pass through both to prevent relative sliding during vibration.

[0025] The lower end face of the linkage seat 4031 in the elastic support assembly 403 has multiple countersunk holes evenly distributed. Each countersunk hole is fitted with a compression spring 4032. The lower end of the compression spring 4032 abuts against the limiting boss inside the fixed seat 1 to form an elastic support structure.

[0026] Two guide seats 404 are symmetrically distributed on both sides of the linkage seat 4031. Their lower ends are rigidly connected to the fixed seat 1 by bolts. The guide seats 404 are U-shaped and arranged around the outside of the linkage seat 4031, which can restrict the linkage seat 4031 to move only in the vertical direction and avoid horizontal deviation.

[0027] The support frame of the exhaust valve 3 is connected to the threaded hole on the upper end face of the mounting platform 2 by bolts. Its rotation axis is exactly placed in the arc-shaped groove of the fixing part 401, and the valve body covers the opening of the mounting platform 2, ensuring that the force of the elastic pressure module 4 can be directly transmitted to the rotation axis through the fixing part 401.

[0028] The compression spring 4032 of the elastic support assembly 403 generates a stable elastic force through a preset compression amount. This elastic force is transmitted to the fixing member 401 through the linkage seat 4031 and the pressure roller assembly 402, and finally acts on the rotating shaft of the exhaust valve 3. The pressure can be precisely controlled by adjusting the compression amount of the compression spring 4032 to meet the diverse requirements of pressure parameters under different test conditions. Moreover, the elastic characteristics of the compression spring 4032 can simulate the dynamic change process of pressure and achieve precise pressure application. The ball bearing design in the pressure roller assembly 402 significantly reduces the frictional resistance during force transmission. When the rotating shaft of the exhaust valve 3 rotates due to the motor drive, the fixed part 401 swings slightly with the rotating shaft, and the line contact between its lower arc surface and the balance roller 4021 is converted into rolling friction. At the same time, the outer ring of the bearing of the pressure roller assembly 4022 rolls synchronously with the movement of the linkage seat 4031, which reduces the friction coefficient of the entire force transmission path, avoids pressure loss to the maximum extent, improves the accuracy of test data, and achieves low-friction force transmission. The multi-layered structural design of the fixture ensures stability during vibration testing. The guide seat 404 restricts the horizontal displacement of the linkage seat 4031, preventing the compression spring 4032 from tilting due to lateral force. The anti-loosening design of the locking bolts and positioning bolts prevents the connection from loosening due to vibration. The fitting of the fixing part 401 with the arc surface of the rotating shaft and the adaptation of the balance roller 4021 with the arc groove 4033 ensure that the pressure always acts perpendicularly on the axis of the rotating shaft during multi-directional vibration, adapting to complex vibration testing environments.

[0029] In summary, this exhaust valve testing fixture achieves stable pressure transmission and adaptability to vibration environments through an optimized connection structure. Its low-friction components and guiding structure enhance testing accuracy and product protection. The fixture transmits pressure through mechanical contact between the fixing component 401 and the rotating shaft, eliminating the need for any additional surface treatment of the exhaust valve 3. No residue remains after testing, making it suitable for testing high-precision products and avoiding damage caused by improper surface treatment. It can be widely applied to various testing scenarios for the vibration durability and pressure response characteristics of exhaust valves.

[0030] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A test fixture for an exhaust valve, characterized in that: It includes a fixed base (1), an installation platform (2) and an exhaust valve (3). The installation platform (2) has an opening. The fixed base (1) is provided with an elastic pressure module (4) corresponding to the opening. The elastic pressure module (4) includes a fixing member (401). The lower end of the fixing member (401) is provided with a pressure roller assembly (402) and an elastic support assembly (403). The elastic support assembly (403) is provided with guide seats (404) on both sides.

2. The exhaust valve testing fixture according to claim 1, characterized in that: The installation platform (2) and the fixed base (1) are fixedly connected by multiple positioning bolts (5), and the exhaust valve (3) is installed on the upper end of the installation platform (2).

3. The exhaust valve testing fixture according to claim 1, characterized in that: The upper end of the fixing member (401) is in contact with the rotating shaft of the exhaust valve (3), and its lower end is arc-shaped and in contact with the pressure roller assembly (402).

4. The exhaust valve testing fixture according to claim 1, characterized in that: The pressure roller assembly (402) includes a balance roller (4021), which has multiple positioning grooves. Two pressure roller groups (4022) are fitted on the balance roller (4021), and the pressure roller group (4022) includes multiple ball bearings arranged in parallel.

5. The exhaust valve testing fixture according to claim 4, characterized in that: The elastic support assembly (403) includes a linkage seat (4031), with a plurality of compression springs (4032) embedded at the lower end of the linkage seat (4031). The upper end of the linkage seat (4031) has a plurality of arc-shaped grooves (4033) and receiving grooves (4034). The balance roller (4021) and the pressure roller group (4022) are respectively embedded in the arc-shaped grooves (4033) and the receiving grooves (4034).

6. The exhaust valve testing fixture according to claim 5, characterized in that: The linkage seat (4031) and the balance roller (4021) are fixed together by locking bolts.

7. The exhaust valve testing fixture according to claim 6, characterized in that: The two guide seats (404) are respectively disposed on both sides of the linkage seat (4031), and the lower end of the guide seat (404) is fixedly connected to the fixed seat (1).

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