CN116067655A - Part testing device, part testing equipment and part testing method - Google Patents

Abstract

The invention provides a part testing device, a part testing device and a part testing method, which relate to the technical field of part testing and solve the problem that the applied static load affects the dynamic load, and then affects the test result when the dynamic load is applied to the bearing. The component testing device includes: a base, a connecting shaft, a sleeve, a fixing piece and a test fastening assembly. Both the connecting shaft and the sleeve are arranged on the base, and the connecting shaft is arranged through the sleeve. The connecting shaft is spaced apart from the inner wall of the sleeve to form an accommodating space, and the accommodating space is used for accommodating parts. The fixing part is located in the sleeve, the fixing part is connected with the sleeve, and abuts against the part, and the part is located between the base and the fixing part. The two ends of the test fastening assembly are respectively connected with the sleeve and the connecting shaft, and the test fastening assembly is used to adjust the distance between the sleeve and the connecting shaft to compress or release the parts. The present invention also provides a component testing device, comprising the component testing device described in the above claims.

Description

Parts testing device, parts testing equipment and parts testing method

Technical Field

The present invention relates to the technical field of parts testing, and in particular to a parts testing device, a parts testing equipment and a parts testing method.

Background Art

Bearings are one of the key components of rocket engine ground test equipment. They must have good working performance to ensure the periodic high-speed rotation of the shaft system, and have good environmental adaptability to withstand the harsh load environment caused by combustion oscillation, mechanical vibration and shaft system load. Therefore, a series of tests must be carried out to verify the reliability of the bearings.

In the prior art, in order to simultaneously simulate the effects of static and dynamic loads caused by combustion oscillation, mechanical vibration and shaft load on the environmental adaptability of bearings, it is necessary to carry out a combined static and dynamic load test of bearings. Currently, this is generally done by building a bearing test bench to simulate its radial static loading and axial dynamic loading.

However, using the above-mentioned bearing test bench, the applied static load affects the dynamic load, thereby affecting the test results when the dynamic load is applied to the bearing.

Summary of the invention

The object of the present invention is to provide a part testing device, a part testing equipment and a part testing method, which are used to avoid the influence of static load on dynamic load during bearing testing, so as to improve the test accuracy when applying dynamic load to the bearing.

In order to achieve the above object, the present invention provides the following technical solutions:

In a first aspect, the present invention provides a part testing device for testing parts. The part testing device includes: a base, a connecting shaft, a sleeve, a fixing member and a test fastening assembly. The connecting shaft and the sleeve are both arranged on the base, and the connecting shaft is arranged through the sleeve. The connecting shaft and the inner wall of the sleeve are spaced apart to form a receiving space, and the receiving space is used to receive the part. The fixing member is located in the sleeve, the fixing member is connected to the sleeve, and abuts against the part, and the part is located between the base and the fixing member. The two ends of the test fastening assembly are respectively connected to the sleeve and the connecting shaft, and the test fastening assembly is used to adjust the distance between the sleeve and the connecting shaft to compress or release the part.

Compared with the prior art, in the part testing device provided by the present invention, the distance between the sleeve and the connecting shaft can be reduced by using the test fastening assembly to squeeze the part located in the accommodation space, thereby applying a static load to the part. Based on this, in conjunction with other data display systems, the test of loading a static load on the part can be realized. Further, since the fixing member is connected to the sleeve and abuts against the part, the part is located between the base and the fixing member. At this time, with the cooperation of the fixing member and the base, it is possible to avoid the part from being separated from the accommodation space when a dynamic load is applied to the part. Based on this, in conjunction with other data display systems, the test of loading a dynamic load on the part can be realized. Further, the static load is converted into an extrusion force on the part by using the above-mentioned part testing device. In other words, the static load is converted into the clamping internal force of the sleeve and the connecting shaft. At this time, the stability of the part can be ensured and the part can be prevented from affecting the outside world. Based on this, the static load applied in the process of testing the part can be avoided from affecting the dynamic load, so as to reduce the test error and improve the test accuracy when applying a dynamic load to the part.

In a second aspect, the present invention further provides a part testing device. The part testing device comprises: a vibration table, a static load detection system and the part testing device according to the above claims. The base of the part testing device is arranged on the vibration table, and the static load detection system is electrically connected to the test fastening assembly of the part testing device to monitor the strain value of the test fastening assembly.

Compared with the prior art, the beneficial effects of the parts testing equipment provided by the present invention are the same as the beneficial effects of the parts testing device described in the above technical solution, which will not be elaborated here.

In a third aspect, the present invention further provides a parts testing method, which is applied to the parts testing device described in the above claims. The parts testing method comprises:

Using the test fastener assembly, adjust the distance between the sleeve and the connecting shaft to compress the parts;

Obtain strain values for test fastener assemblies when compressing parts;

When it is determined that the strain value satisfies the static load application condition, the part test device with the fixed part is placed on the vibration table;

Use a vibration table to apply dynamic loads to the parts and obtain the power spectral density.

Compared with the prior art, the beneficial effects of the part testing method provided by the present invention are the same as the beneficial effects of the part testing device and the part testing equipment described in the above technical solution, which will not be described in detail here. Furthermore, the above-mentioned vibration table can be used to apply dynamic loads of any frequency to the parts. At this time, compared with the prior art that can only test the performance of parts at low frequencies, the part testing method and part testing equipment provided by the present invention can cover low frequencies and high frequencies, expanding the testing environment of the parts. Furthermore, combined with the test of the parts when static loads are applied to them, the present invention can achieve accurate testing of parts in complex environments, thereby verifying the reliability of the parts.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

FIG1 is a schematic structural diagram of a parts testing device according to an embodiment of the present invention;

FIG2 is a partial structural schematic diagram of a test fastening assembly according to an embodiment of the present invention;

FIG3 is a schematic structural diagram of a parts testing device according to an embodiment of the present invention;

FIG4 is a curve diagram showing the strain value variation of the connecting rod during the parts testing process in an embodiment of the present invention;

FIG. 5 is a diagram showing the relationship between frequency and power spectrum density under dynamic load in an embodiment of the present invention.

Reference numerals:

1-parts, 2-base, 3-connecting shaft, 4-sleeve,

40-first inner wall, 41-second inner wall, 42-third inner wall, 5-fixing member,

6-Test fastening assembly, 60-Connecting rod, 61-Fastener, 62-Strain gauge,

63-Blocking member, 7-Cover, 8-Static load detection system, 9-Vibration table.

Implementation

In order to clearly describe the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish between identical or similar items with substantially identical functions and effects. For example, the first threshold and the second threshold are only used to distinguish between different thresholds, and do not limit their order. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

It should be noted that, in the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

In the present invention, "at least one" means one or more, and "plurality" means two or more. "And/or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.

Combined with the description in the background technology section, existing bearing tests mainly include life tests to obtain the working life of the bearing, performance tests to obtain certain parameters (such as friction coefficient), and environmental simulation tests to verify environmental adaptability. The current ground test equipment for environmental simulation tests on bearings cannot cover the actual use environment, and only its high-speed rotation characteristics can be verified through performance tests before leaving the factory. Based on this, in order to simultaneously simulate the effects of static and dynamic loads caused by combustion oscillations, mechanical vibrations and shaft system loads on the environmental adaptability of bearings, it is necessary to carry out a composite test of static and dynamic loads on bearings. At present, it is generally done by establishing a bearing test bench to simulate its radial static loading and axial dynamic loading states. However, there is a problem of mutual influence and coupling between static loads and dynamic loads when using the above-mentioned bearing test bench.

In order to solve the above technical problems, in the first aspect, an embodiment of the present invention provides a part testing device for testing a part. The above part can be a bearing or other device to be tested. The following description takes a bearing as an example. It should be understood that the following description is only for understanding and is not for specific limitation.

Referring to Figures 1 and 2, the part testing device may include: a base 2, a connecting shaft 3, a sleeve 4, a fixing member 5 and a test fastening assembly 6. The connecting shaft 3 and the sleeve 4 are both arranged on the base 2, and the connecting shaft 3 is arranged through the sleeve 4. The connecting shaft 3 and the inner wall of the sleeve 4 are spaced apart to form a receiving space, and the receiving space is used to receive the part 1. The fixing member 5 is located in the sleeve 4, the fixing member 5 is connected to the sleeve 4, and abuts against the part 1, and the part 1 is located between the base 2 and the fixing member 5. The two ends of the test fastening assembly 6 are respectively connected to the sleeve 4 and the connecting shaft 3, and the test fastening assembly 6 is used to adjust the distance between the sleeve 4 and the connecting shaft 3 to compress or release the part 1.

Referring to FIGS. 1 to 3 , the base 2 and the connecting shaft 3 have a portion of hollow area inside, which can reduce the manufacturing cost of the base 2 and the connecting shaft 3, and can also reduce the weight of the base 2 and the connecting shaft 3, which is beneficial to reduce the energy consumption when the vibration table 9 is used to provide dynamic loads in the later stage. In the embodiment of the present invention, the connecting shaft 3 is located in the central area of the base 2, and the base 2 and the connecting shaft 3 are integrally formed.

Furthermore, the shape of the accommodation space matches the shape of the bearing. In actual use, the connecting shaft 3 passes through the inner ring of the bearing, the inner wall of the bearing fits with the connecting shaft 3, and the outer wall of the bearing fits with the inner wall of the sleeve 4. At this time, the stability of the bearing can be further ensured, and it is also convenient for testing the bearing.

Referring to FIGS. 1 to 3 , in the part testing device provided by the embodiment of the present invention, the distance between the sleeve 4 and the connecting shaft 3 can be reduced by using the test fastening assembly 6 to squeeze the part 1 located in the accommodation space, thereby applying a static load to the part 1. Based on this, in conjunction with other data display systems, a test can be implemented when the part is loaded with a static load. Further, since the fixing member 5 is connected to the sleeve 4 and abuts against the part 1, the part 1 is located between the bearing surface and the fixing member 5. At this time, with the cooperation of the fixing member 5 and the base 2, it is possible to avoid the part 1 from being separated from the accommodation space when a dynamic load is applied to the part 1. Based on this, in conjunction with other data display systems, a test can be implemented when the part 1 is loaded with a dynamic load. Further, the static load is converted into an extrusion force on the part 1 by using the above-mentioned part testing device. In other words, the static load is converted into the clamping internal force of the sleeve 4 and the connecting shaft 3. At this time, the stability of the part 1 can be ensured, and the part 1 can be prevented from affecting the outside world. Based on this, the static load applied during the test of the part 1 can be prevented from affecting the dynamic load, so as to reduce the test error and improve the test accuracy when the dynamic load is applied to the part 1.

As a possible implementation, referring to Figures 1 to 3, the test fastening assembly 6 may include: a connecting rod 60, a fastener 61, and a strain gauge 62. The first end of the connecting rod 60 is connected to the connecting shaft 3, the fastener 61 is disposed on the sleeve 4, and the fastener 61 is connected to the second end of the connecting rod 60. The strain gauge 62 is disposed on the side wall of the connecting rod 60 and is located between the first end and the second end.

By adopting the above technical solution, the connecting rod 60 can be strained by adjusting the tightening torque of the fastener 61, and the strain of the connecting rod 60 acts on the inner ring and outer ring of the bearing through the sleeve 4 and the connecting shaft 3. For example, the sleeve 4 can be squeezed by tightening the fastener 61, and the sleeve 4 will squeeze the bearing inward. Based on this, it is possible to apply a static load to the bearing.

Exemplarily, the material of the connecting rod 60 can be metal, and the type of metal can be selected according to actual conditions, as long as it can meet actual needs. The first end and the second end of the connecting rod 60 are both provided with external threads, and the connecting shaft 3 and the fastener 61 both have internal threads matching the external threads. For example, the fastener 61 can be a hollow bolt. In an embodiment of the present invention, the first end of the connecting rod 60 is threadedly connected to the connecting shaft 3, and the fastener 61 is also threadedly connected to the second end of the connecting rod 60. Furthermore, the number and setting position of the strain gauge 62 can be set according to actual conditions. In an embodiment of the present invention, 3 to 4 strain gauges 62 are provided on the side wall of the connecting rod 60, and the length direction of the strain gauge 62 is parallel to the axial direction of the connecting rod 60.

In one example, referring to FIGS. 1 to 3 , the test fastening assembly 6 may further include: a blocking member 63, which is disposed on a side wall of the connecting rod 60 and is circumferentially fixed relative to the connecting rod 60. The blocking member 63 is located between the first end and the strain gauge 62, and is used to limit the distance between the second end and the connecting shaft 3.

The blocking member 63 can be used to limit the depth of the connecting rod 60 into the connecting shaft 3, so as to prevent the connecting rod 60 from penetrating too far into the connecting shaft 3, so as to prevent the connecting rod 60 from being too far away from the fastener 61, resulting in the connecting rod 60 being unable to be firmly connected to the fastener 61, thereby ensuring the stable application of the static load. Furthermore, in the process of assembling the connecting rod 60 and the connecting shaft 3, with the cooperation of the blocking member 63, it is convenient for tightening tools such as a wrench to apply force, thereby facilitating the connection of the connecting rod 60 and the connecting shaft 3. Exemplarily, the blocking member 63 can be a nut.

In one example, referring to Fig. 1 to Fig. 3, the above-mentioned part testing device may further include: a cover body 7. The cover body 7 is opposite to the base 2 and is arranged at a distance, the sleeve 4 and the connecting shaft 3 are both located between the cover body 7 and the base 2, and the cover body 7 is fastened to the sleeve 4 and the connecting shaft 3 respectively.

In the embodiment of the present invention, since the base 2 and the connecting shaft 3 are integrally formed, when the cover 7 is tightly connected to the connecting shaft 3, the distance between the cover 7 and the base 2 is fixed. Since the sleeve 4 is located between the cover 7 and the base 2, at this time, the sleeve 4 is confined between the base 2 and the cover 7. Therefore, it can be further ensured that the sleeve 4 is tightly connected to the base 2. Based on this, it can not only further prevent the part from escaping from the accommodation space when a dynamic load is applied to the part. At the same time, it can also further ensure the stability of the sleeve 4, thereby ensuring the stability and firmness of the part testing device.

In one example, when the part testing device includes a cover, the sleeve may be merely placed on the base but not welded, bonded, bolted, etc. to the base.

In another example, when the part testing device includes a cover, the sleeve can be welded, bonded, or bolted to the base.

As a possible implementation, referring to FIG. 1 to FIG. 3 , the inner wall of the sleeve 4 is a stepped inner wall. Along the direction away from the base 2, the stepped inner wall includes a first inner wall 40, a second inner wall 41 and a third inner wall 42, the thickness of which gradually decreases. Specifically, the thickness of the first inner wall 40 is less than the thickness of the second inner wall 41, and the thickness of the second inner wall 41 is less than the thickness of the third inner wall 42. The part 1 is located between the second inner wall 41 and the connecting shaft 3, and the height H1 of the part 1 is equal to the height H2 of the second inner wall 41. The fixing member 5 is located between the third inner wall 42 and the connecting shaft 3, and the fixing member 5 is tightly connected to the second inner wall 41.

Since the height H1 of the part is equal to the height H2 of the second inner wall 41, and the fixing member 5 is tightly connected to the second inner wall 41, the bearing is confined between the junction of the second inner wall 41 and the first inner wall 40 (i.e., the step area) and the fixing member 5. Based on this, when a dynamic load is applied to the bearing, the bearing is fixed between the step area and the fixing member 5 to prevent the bearing from moving up and down, thereby preventing the part testing device from applying an additional dynamic load to the bearing, thereby reducing the impact on the dynamic test of the bearing.

In one example, when the above-mentioned part testing device includes two test fastening assemblies 6, the first test fastening assembly 6 passes through the third inner wall 42 and is connected to the connecting shaft 3, and the first test fastening assembly 6 is spaced apart from the fixing member 5. The second test fastening assembly 6 is located between the first test fastening assembly 6 and the base 2, and the part is located between the two test fastening assemblies 6.

Since the two test fastening assemblies 6 are located at both ends of the bearing, the actual static load on the bearing can be more accurately calculated by using the static load detection system 8 electrically connected to the test fastening assembly 6. Based on this, the tightening torque applied to the fastener 61 can be adjusted in real time according to the value calculated by the static load detection system 8, so that the difference between the actual static load and the preset static load is within a controllable range to ensure the accuracy of the test.

As a possible implementation, the part testing device may include two parallel test fastening assemblies 6, the connecting shaft 3 is disposed through the part 1, and each test fastening assembly 6 is parallel to the radial direction of the part 1. In this case, it can be ensured that the two test fastening assemblies 6 apply radial static loads to the bearing. Furthermore, the two test fastening assemblies 6 are located on the same side of the bearing. In this case, it is convenient for the staff to operate.

In a second aspect, an embodiment of the present invention further provides a part testing device. Referring to FIGS. 1 to 3 , the part testing device may include: a vibration table 9, a static load detection system 8, and the part testing device described in the above claims. The base 2 of the part testing device is disposed on the vibration table 9, and the static load detection system 8 is electrically connected to the test fastening assembly 6 of the part testing device to monitor the strain value of the test fastening assembly 6.

The beneficial effects of the parts testing equipment provided by the embodiment of the present invention are the same as the beneficial effects of the parts testing device described in the above technical solution, and will not be described in detail here.

Exemplarily, the static load detection system 8 is a mature static strain test system in the prior art. Its specific structure is not described in detail here, and reference may be made to the prior art. For example, the static load detection system 8 may be electrically connected to the strain gauge 62 or the connecting rod 60 in the test fastening assembly 6 through a wire.

Furthermore, the vibration table 9 can provide a dynamic load of any frequency for the parts, for example, the dynamic loading frequency can be from low frequency to high frequency. At this time, the performance of the bearing under a complex environment of static load and high-frequency dynamic load can be tested by using the parts testing equipment. As for the specific structure of the vibration table 9, no specific limitation is made here, as long as it can meet the actual needs.

In a third aspect, an embodiment of the present invention further provides a part testing method, which is applied to the part testing device described in the above claims. Referring to Figures 1 to 3, the part testing method includes:

Step 101 : threading a first end of a first connecting rod 60 into a blind hole in a connecting shaft 3 close to a base 2 .

Step 102 : Sleeve the sleeve 4 on the outer side of the connecting shaft 3 along the axial direction of the connecting shaft 3 , and then place the bearing in the accommodating space along the axial direction of the connecting shaft 3 .

Step 103: Place the fixing member 5 inside the sleeve 4, use bolts to fasten the fixing member 5 to the end of the sleeve 4 away from the base 2, and make the fixing member 5 abut against the end surface of the bearing, so that the fixing member 5 fixes the bearing.

Step 104 : threading the first end of the second connecting rod 60 to the blind hole in the connecting shaft 3 away from the base 2 .

Step 105 : Make the two fasteners 61 pass through the through holes provided on the wall of the sleeve 4 , respectively, so that the two fasteners 61 are threadedly connected to the second end of the first connecting rod 60 and the second end of the second connecting rod 60 , respectively.

Step 106: Use the test fastening assembly 6 to adjust the distance between the sleeve 4 and the connecting shaft 3 to compress the parts.

Exemplarily, by tightening the fastener 61 , the distance between the sleeve 4 and the connecting shaft 3 is reduced to compress the bearing located in the accommodating space.

Step 107: Obtain the strain value of the test fastening assembly 6 when the part is compressed;

Exemplarily, a static load detection system 8 electrically connected to the test fastening assembly 6 is used to obtain the strain value of the test fastening assembly 6 when the part is compressed. In the embodiment of the present invention, the strain value of the test fastening assembly 6 when the part is compressed is obtained multiple times to calculate the average strain value. That is, the above strain value is the average strain value, which can reduce the error.

Step 108: When it is determined that the strain value satisfies the static load application condition, the part testing device with the fixed part is placed on the vibration table 9;

The above-mentioned test fastening assembly 6 can be used to adjust the static load applied to the bearing at one time, and no further adjustment is required during the subsequent test process, thereby avoiding the coupling problem of static load and dynamic load.

Step 109: Before placing the part testing device with the parts fixed thereon on the vibration table 9, the cover body 7 is fastened to the connecting shaft 3 and the sleeve 4 respectively by bolts.

Exemplarily, the cover body 7 is installed when the fastener 61 and the sleeve 4 are adjusted in place. At this time, the accuracy of the static load can be ensured, which is conducive to the compression of the sleeve 4.

Step 1010: Apply a dynamic load to the part using the vibration table 9 and obtain the power spectrum density.

Exemplarily, the frequency provided by the vibration table 9 can be set according to actual needs and is not specifically limited here.

The beneficial effects of the part testing method provided by the embodiment of the present invention are the same as the beneficial effects of the part testing device and the part testing equipment described in the above technical solution, and will not be elaborated here. Furthermore, the above-mentioned vibration table 9 can be used to apply dynamic loads of any frequency to the parts. At this time, compared with the situation in the prior art that can only test the performance of parts at low frequencies, the part testing method and part testing equipment provided by the embodiment of the present invention can cover low frequencies and high frequencies, expanding the testing environment of the parts. Furthermore, combined with the test when the parts are loaded with static loads, the embodiment of the present invention can realize accurate testing of parts in complex environments, thereby verifying the reliability of the parts.

In a possible implementation, when testing a fastening assembly including a connecting rod, a fastener and a strain gauge, the static load application condition is:

；

;

表示连接杆的应变值，n表示连接杆的编号，

表示连接杆的预设应变值。in,

represents the strain value of the connecting rod, n represents the number of the connecting rod,

Indicates the preset strain value of the connecting rod.

In one example, the strain value of the connecting rod satisfies:

；

;

表示连接杆上应变片的测量值，n表示连接杆的编号，i表示连接杆上应变片的编号，N表示应变片的数量。in,

represents the measured value of the strain gauge on the connecting rod, n represents the number of the connecting rod, i represents the number of the strain gauge on the connecting rod, and N represents the number of strain gauges.

The preset strain value of the connecting rod satisfies:

；

;

Where F is the static load, E is the elastic modulus of the connecting rod material, and d is the nominal diameter of the connecting rod.

，将第二个测试紧固组件中的连接杆的应变值定义为

。In the embodiment of the present invention, since the part testing device includes two test fastening assemblies, the strain values of the two connecting rods need to satisfy the above-mentioned static load application conditions. In order to facilitate the distinction, the strain value of the connecting rod in the first test fastening assembly is defined as

, the strain value of the connecting rod in the second test fastener assembly is defined as

.

和

。当

，且

时，停止向紧固件施加力矩。During the actual test, torque is applied to the two fasteners in turn, and the strain values of the two connecting rods are monitored in real time using a static load detection system.

and

.when

,and

Stop applying torque to the fastener when

Referring to Figures 4 and 5, there are shown changes in the strain value of one of the connecting rods monitored by the static load detection system when the bearing is subjected to static load and dynamic load tests using the part testing equipment provided by an embodiment of the present invention, as well as the reliability range of the test of the part testing device provided by an embodiment of the present invention under the application of dynamic load.

Specifically, referring to FIG4, the torque applied to the fastener is continuously adjusted within the range of 0~300s so that the strain value detected by the static load detection system meets the actual needs (that is, the detected strain value meets the static load application condition). Within the range of 300~680s, it means that the static load applied to the bearing is certain to test the performance of the bearing under this degree of static load. Within the range of 680~2000s, it means that a dynamic load is applied to the bearing on the basis of the static load so that the bearing is tested for performance under a composite environment of static and dynamic loads. According to FIG4, the difference between the strain value detected by the static load detection system within the range of 680~2000s and the strain value detected by the static load detection system within the range of 300~680s is small, and the difference is within the error range and can be ignored. Based on this, it can be seen that when testing parts using the part testing equipment provided by the embodiment of the present invention, the influence of dynamic load on static load can be ignored. Combined with the foregoing description, it can be seen that the use of the part testing equipment provided by the embodiment of the present invention can reduce or avoid the mutual influence and coupling of static loads and dynamic loads, so as to improve the test accuracy of parts. Figure 5 shows that the part testing equipment provided by the embodiment of the present invention can apply a dynamic load with a frequency range of 10Hz~2000Hz to the part. That is, the part testing equipment provided by the embodiment of the present invention can cover low frequencies and high frequencies to expand the test environment of the part. Among them, the root mean square acceleration is 34.46g.

In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A part testing apparatus for testing a part, the part testing apparatus comprising:

a base;

the connecting shaft is arranged on the base;

the sleeve is arranged on the base, and the connecting shaft is arranged in the sleeve in a penetrating way; the connecting shaft is arranged at intervals with the inner wall of the sleeve so as to form an accommodating space; the accommodating space is used for accommodating the part;

the fixing piece is positioned in the sleeve; the fixing piece is connected with the sleeve and is abutted with the part; the part is positioned between the base and the fixing piece;

and the two ends of the test fastening assembly are respectively connected with the sleeve and the connecting shaft, and the test fastening assembly is used for adjusting the distance between the sleeve and the connecting shaft so as to compress or release the part.

2. The part testing apparatus of claim 1, wherein the test fastening assembly comprises:

the first end of the connecting rod is connected with the connecting shaft;

the fastener is arranged on the sleeve and is connected with the second end of the connecting rod;

the strain gauge is arranged on the side wall of the connecting rod and is positioned between the first end and the second end.

3. The part testing apparatus of claim 2, wherein the test fastening assembly further comprises: the blocking piece is arranged on the side wall of the connecting rod and is circumferentially fixed relative to the connecting rod; the blocking piece is positioned between the first end and the strain gauge and used for limiting the distance between the second end and the connecting shaft; and/or the number of the groups of groups,

the part test apparatus further includes: the cover body is opposite to the base and is arranged at intervals; the sleeve and the connecting shaft are both positioned between the cover body and the base, and the cover body is respectively and tightly connected with the sleeve and the connecting shaft.

4. The part testing apparatus of claim 1, wherein the inner wall of the sleeve is a stepped inner wall;

the stepped inner wall sequentially comprises a first inner wall, a second inner wall and a third inner wall with gradually reduced thickness along the direction away from the base; the part is positioned between the second inner wall and the connecting shaft, and the height of the part is equal to the height of the second inner wall; the fixing piece is located between the third inner wall and the connecting shaft, and the fixing piece is fixedly connected with the second inner wall.

5. The part testing apparatus of claim 4, wherein when the part testing apparatus comprises two of the test fastener assemblies;

the first test fastening assembly penetrates through the third inner wall to be connected with the connecting shaft, and the first test fastening assembly is arranged at intervals with the fixing piece;

a second of the test fastener assemblies is positioned between the first of the test fastener assemblies and the base, and the part is positioned between the two test fastener assemblies.

6. The part testing apparatus of claim 1 or 5, wherein the part testing apparatus comprises two of the test fastening assemblies parallel to each other; the connecting shaft is arranged in the part in a penetrating way; each of the test fastening assemblies is parallel to a radial direction of the part.

7. A part testing apparatus, comprising:

the part testing apparatus of any one of claims 1-6;

the base of the part testing device is arranged on the vibration table;

and the static load detection system is electrically connected with the test fastening assembly of the part test device and is used for monitoring the strain value of the test fastening assembly.

8. A part testing method, characterized by being applied to the part testing apparatus of claim 7; the part testing method comprises the following steps:

adjusting a distance between the sleeve and the connecting shaft with the test fastening assembly to compress the part;

obtaining a strain value of the test fastener assembly while compressing the part;

when the strain value meets the static load applying condition, placing the part testing device fixed with the part on a vibrating table;

dynamic loading is applied to the part by the vibrating table, and power spectral density is obtained.

9. The part testing method of claim 8, wherein when the test fastening assembly comprises a connecting rod, a fastener, and a strain gauge, the static load application condition is:

；

wherein ,

representing the strain value of the connecting rod,na number representing said connecting rod,/->

Representing a preset strain value of the connecting rod.

10. The part testing method of claim 9, wherein the connecting rod has a strain value that satisfies:

；

wherein ,

representing the measured value of said strain gauge on the connecting rod,nrepresenting the connecting rodIs provided with the number of (a),ithe number of the strain gage on the connecting rod is indicated,Nrepresenting the number of the strain gage;

the preset strain value of the connecting rod meets the following conditions:

；

wherein ,Frepresenting the static load of the vehicle and,Erepresenting the modulus of elasticity of the connecting rod material,drepresenting the nominal diameter of the connecting rod.

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