Elastic element detection device

Abstract

The utility model relates to a detection device, in particular to a detection device for an elastic element, which comprises a base with an open bottom and a detection assembly matched with the base to detect a disc spring. The detection assembly comprises a positioning shaft, a pressing plate and a pressure sensor. One end of the positioning shaft penetrates through the base and can move in the axial direction. The end, penetrating through the base, of the positioning shaft is provided with a limiting piece capable of adjusting the locking position and limiting the positioning shaft to move in the direction away from the base. A displacement sensor capable of detecting the distance between the pressing plate and the base is arranged on the base or the pressing plate; by adopting the technical scheme, the positioning shaft can axially move on the base along the positioning shaft, so that the pressing plate can be repeatedly driven by the press machine to repeatedly compress the elastic element for fatigue test, and the positioning shaft penetrating through the base can be locked by the limiting piece to keep the elastic element in a compressed state for load detection.

Description

Technical Field

[0001] The utility model relates to a detection device, in particular to a detection device for an elastic element. Background Art

[0002] Elastic elements such as springs, rubber springs or disc springs need to be tested for performance during production. For example, the test of the load, relaxation, creep and other properties of the disc spring requires that the disc spring be compressed and kept for a long time to observe the load change, as well as the free height and creep amount after release, or that the disc spring be repeatedly compressed to detect its fatigue performance. Existing testing devices such as a disc spring performance testing device disclosed in the Chinese utility model patent with publication number CN219777056U, in which the screw rod cooperates with the base thread, the cover plate is driven to compress the disc spring by screwing the screw rod, a pressure sensor is set on the base to detect the load of the disc spring, and a scale is set on the guide rod to observe the compression amount of the disc spring. The device is convenient for detecting load changes, creep and other properties, and can maintain the compression amount for a long time by locking the screw rod. However, it is difficult for fatigue testing that requires repeated compression and deformation, and the screw rod needs to be repeatedly tightened to make the disc spring deform repeatedly, and it is also extremely inconvenient to observe the compression amount. Moreover, the device can only detect disc springs with a small elastic coefficient, and disc springs with a large elastic coefficient cannot be compressed by manually screwing the bolt. Therefore, there are also devices in the prior art that use hydraulic equipment to detect disc springs, such as the disc spring detection device disclosed in Chinese utility model patent publication number CN207215334U, which can repeatedly pressurize the disc spring through a pressing mechanism to perform fatigue testing. However, when the load test needs to keep the disc spring compressed for a long time, the pressing mechanism needs to always maintain a pressurized state, which is costly, time-consuming and energy-consuming. Utility Model Content

[0003] In order to solve the problem that the detection device in the prior art is too single in detecting the disc spring parameters and the detection data is inaccurate, the technical solution adopted by the utility model is:

[0004] An elastic element detection device comprises a base with an open bottom and a detection component that cooperates with the base to detect a disc spring;

[0005] The detection assembly includes a positioning shaft, a pressure plate, and a pressure sensor;

[0006] One end of the positioning shaft passes through the base and can move in the axial direction. A limiting member capable of adjusting the locking position and limiting the movement of the positioning shaft in a direction away from the base is provided at the end of the positioning shaft passing through the base.

[0007] The pressing plate and the pressure sensor are sleeved on the end of the positioning shaft away from the base, and a blocking member is provided at the end of the positioning shaft away from the base to limit the pressure sensor and the pressing plate from being separated from the end away from the base;

[0008] A displacement sensor capable of detecting the distance between the pressing plate and the base is arranged on the base or the pressing plate.

[0009] Furthermore, the positioning shaft has a step at one end away from the base, and the pressure plate and the pressure sensor are restricted on the positioning shaft by the blocking member and the step at the end of the positioning shaft away from the base.

[0010] Furthermore, one end of the positioning shaft passing through the base is provided with a step, and a step hole matching the step is provided on the base.

[0011] Furthermore, a detachable lifting ring is provided at one end of the positioning shaft away from the base.

[0012] Furthermore, the limiting member and the blocking member are both nuts.

[0013] Furthermore, a support plate is provided between the pressure plate and the pressure sensor, and an annular boss is provided on the side of the support plate in contact with the pressure plate.

[0014] By adopting the above technical scheme, since the positioning shaft can move axially along the positioning shaft on the base, the press can be used to repeatedly drive the pressure plate to repeatedly compress the elastic element for fatigue testing, and the positioning shaft passing through the base can be locked by the limiter to keep the elastic element in a compressed state for load testing. Moreover, while maintaining the compressed state, the displacement sensor and the pressure sensor can be used to detect data changes in real time, and the data collection of the compression amount is more accurate, which facilitates the control and acquisition of detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A half-section stereoscopic diagram of an elastic element detection device;

[0016] Figure 2 It is an exploded view of the elastic element detection device;

[0017] Figure 3 This is a cross-sectional view of the elastic element detection device with the disc spring installed. DETAILED DESCRIPTION

[0018] like Figure 1 and Figure 2 The disc spring detection device shown in the figure comprises a base 1, the upper surface of which is used to carry the elastic element to be detected (such as Figure 3 The disc spring in the disc spring), the bottom of the base 1 is open (details will be further explained later), and a detection component 2 is also provided on the base 1 to cooperate with the base 1 to compress the disc spring and detect the load change of the disc spring.

[0019] like Figures 1 to 3The detection component 2 shown includes a positioning shaft 2-1, a pressure plate 2-2 and a pressure sensor 2-3. The pressure sensor 2-3 and the pressure plate 2-2 are both annularly sleeved on the positioning shaft 2-1. A nut is provided on the top of the positioning shaft 2-1 as a blocking member 2-5 to prevent the pressure sensor 2-3 and the pressure plate 2-2 from detaching from the end where the blocking member 2-5 is installed. A through hole is provided on the base 1 for the positioning shaft 2-1 to pass through. The lower end of the positioning shaft 2-1 passes through the through hole. When the disc spring is detected, the disc spring is sleeved on the positioning shaft 2-1 and placed between the base 1 and the pressure plate 2-2. The positioning shaft 2-1 is driven by a press to move axially, so that the pressure plate 2-2 compresses the disc spring. After the disc spring is compressed, its elastic force acts on the pressure plate 2-2, so that the pressure plate 2-2 presses the pressure sensor 2-3, and cooperates with the blocking member 2-5 to squeeze the pressure sensor 2-3, so that the load size of the disc spring can be detected.

[0020] When testing disc springs, in addition to obtaining the load size after the disc spring is compressed, it is also necessary to obtain the compression amount of the disc spring. Figure 1 As shown, a displacement sensor 3 is arranged on the base 1. In this embodiment, the displacement sensor 3 can detect the displacement change of the pressure plate 2-2 when compressing the disc spring, so as to quickly and accurately obtain the compression amount of the disc spring. This displacement change is relative, so the displacement sensor 3 can also be arranged on the pressure plate 2-2, and the compression amount can be obtained by detecting the displacement change between the displacement sensor 3 and the base 1.

[0021] Generally, when testing the creep, load and relaxation of disc springs, it is necessary to keep the disc springs in a compressed state for a long time. In order to keep the disc springs in a compressed state for a long time without the help of a press, Figure 1 In the embodiment shown, a limit member 2-4 consisting of a nut is screwed on one end of the positioning shaft 2-1 passing through the base. When the press drives the detection component 2 to compress the disc spring to a certain compression amount, the nut at the bottom of the base 1 is screwed so that the nut is pressed against the bottom of the base 1. After the press is released, the positioning shaft 2-1 is limited to rebound under the elastic force of the disc spring by the limit member 2-4, so that the disc spring can maintain a compressed state for a long time under a specific compression amount. Therefore, in order to be able to limit and lock the end of the positioning shaft 2-1 passing through the base by the nut, as mentioned above, the bottom of the base 1 needs to be open for the installation and locking operation of the limit member 2-4. Since the pressure sensor 2-3 is arranged on the positioning shaft 2-1, the load change can still be detected in real time after the device is removed from the press. When the time reaches the detection standard, the bolt is loosened, and the change in free height and creep amount can be detected by the displacement sensor 3, and the detection data is more accurate.

[0022] The detection device can be further optimized based on the above structure. For example, when it is necessary to detect disc springs of larger specifications, since conventional nuts cannot adapt to the thicker positioning shaft 2-1, a stepped shaft is formed at one end of the positioning shaft 2-1 that passes through the base 1, so that the thinner part is screwed with the nut serving as the limiter 2-4. In order to adapt to the step passing through one side of the positioning shaft 2-1, a stepped hole is also provided on the base 1. It should be noted that there is a slight distance between the end face of the positioning shaft 2-1 at the step in the uncompressed state after assembly and the inner end face of the stepped hole on the base 1, and the distance should be greater than the compression amount that the disc spring needs to be compressed. Similarly, when the blocking member 2-5 also uses a nut and the positioning shaft 2-1 is thicker, one end of the positioning shaft 2-1 on which the pressure plate 2-2 and the pressure sensor 2-3 are set also forms a stepped shaft, and the nut serving as the blocking member 2-5 is screwed into the thinner part. Under this structure, the pressure plate 2-2 and the pressure sensor 2-3 can be restricted to the end away from the base 1 by the nut and the step on the positioning shaft 2-1. When assembling before testing, since the pressure plate 2-2 and the pressure sensor 2-3 are blocked by the step, there is no need to worry about the pressure plate 2-2 and the pressure sensor 2-3 falling off from one end of the rotating shaft.

[0023] In addition to the structure given in this embodiment, the positioning shaft 2-1 of the device can be in the form of a cylinder without steps, and the limit member 2-4 and the blocking member 2-5 can be screwed together with customized nuts, or the flange formed when processing the positioning shaft 2-1 can be used as the blocking member 2-5.

[0024] For the test of large disc springs, the size and mass of the detection component 2 are also large, and the detection component needs to be assembled with the base through lifting equipment. Therefore, a lifting ring 4 can be set at the end of the positioning shaft 2-1 to cooperate with the lifting. The lifting ring 4 can be removed to facilitate the subsequent disc spring compression by the press.

[0025] When testing large disc springs, since the elastic force of the disc springs is relatively large, in order to avoid deformation of the pressure plate 2-2, which may lead to inaccurate compression detection data, a support plate 2-6 is further arranged between the pressure plate 2-2 and the pressure sensor 2-3. An annular boss 2-61 is arranged on the side of the support plate 2-6 in contact with the pressure plate 2-2. The specifications of the annular boss 2-61 match the specifications of the contact part between the disc spring and the pressure plate 2-2, thereby offsetting the deformation of the pressure plate 2-2.

Claims

1. An elastic element detection device, characterized in that: It comprises a base (1) with an open bottom and a detection component (2) that cooperates with the base (1) to detect the disc spring; The detection component (2) comprises a positioning shaft (2-1), a pressure plate (2-2), and a pressure sensor (2-3); One end of the positioning shaft (2-1) passes through the base (1) and is movable in the axial direction, and a limiting member (2-4) capable of adjusting a locking position and limiting the positioning shaft (2-1) from moving in a direction away from the base (1) is provided at the end of the positioning shaft (2-1) passing through the base (1); The pressing plate (2-2) and the pressure sensor (2-3) are sleeved on the end of the positioning shaft (2-1) away from the base (1), and a blocking member (2-5) is provided at the end of the positioning shaft (2-1) away from the base (1) to limit the pressure sensor (2-3) and the pressing plate (2-2) from being separated from the end away from the base (1); A displacement sensor (3) capable of detecting the distance between the pressing plate (2-2) and the base (1) is arranged on the base (1) or the pressing plate (2-2).

2. The elastic element detection device according to claim 1, characterized in that: The positioning shaft (2-1) has a step at one end away from the base (1), and the pressure plate (2-2) and the pressure sensor (2-3) are restricted on the positioning shaft (2-1) by the blocking member (2-5) and the step at one end of the positioning shaft (2-1) away from the base (1).

3. An elastic element detection device according to claim 1 or 2, characterized in that: One end of the positioning shaft (2-1) passing through the base (1) is provided with a step, and a step hole matching the step is provided on the base (1).

4. The elastic element detection device according to claim 1, characterized in that: A detachable hanging ring (4) is provided at one end of the positioning shaft (2-1) away from the base (1).

5. The elastic element detection device according to claim 1, characterized in that: The limiting member (2-4) and the blocking member (2-5) are both nuts.

6. The elastic element detection device according to claim 1, characterized in that: A support plate (2-6) is arranged between the pressure plate (2-2) and the pressure sensor (2-3), and an annular boss (2-61) is arranged on the side of the support plate (2-6) in contact with the pressure plate (2-2).

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