Air tightness testing device

Abstract

The present disclosure provides a kind of air tightness detection device.The air tightness detection device includes: first pressing plate and second pressing plate, first pressing plate and second pressing plate are oppositely arranged along the first direction and can be relatively moved along the first direction, first pressing plate and second pressing plate are suitable for clamping reducer along the reducer axial direction, to block the opening at the both ends of reducer axial direction, second pressing plate has first gas passage and second gas passage, first gas passage and second gas passage are communicated with installation cavity by opening;Sealing cover, sealing cover is connected with one of first pressing plate or second pressing plate, is suitable for sealingly fitted with bearing outer ring and bearing inner ring, sealing cover is suitable for being located at the side of groove along the reducer axial direction, and is enclosed with bearing outer ring, bearing inner ring and first oil seal to form detection cavity, sealing cover is equipped with air pressure sensor.According to the air tightness detection device of the present disclosure, on the one hand, the detection result is more accurate and reliable.On the other hand, the process of detection is simplified, and the working hours of detection is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of airtightness testing technology, specifically to an airtightness testing device. Background Technology

[0002] In the existing technology, the air tightness test results of the oil seal of the reducer are inaccurate, and different air tightness testers are required for different test modes, which leads to problems such as complicated procedures and long working time when switching test modes. Utility Model Content

[0003] In view of this, the present disclosure provides an airtightness testing device, which on the one hand makes the test results more accurate and reliable, and on the other hand simplifies the testing process and reduces the testing time.

[0004] An airtightness testing device according to an embodiment of this disclosure is used to test the airtightness of a speed reducer. The speed reducer includes: an inner bearing ring, an outer bearing ring, and a first oil seal. The outer bearing ring is located circumferentially outside the inner bearing ring and is spaced apart from the inner bearing ring to form a groove. The first oil seal is located in the groove. The speed reducer has a mounting cavity that communicates with the groove. The device includes: a first pressure plate and a second pressure plate. The first pressure plate and the second pressure plate are arranged opposite to each other along a first direction and are movable relative to each other along the first direction. The first pressure plate and the second pressure plate are adapted to clamp the speed reducer along its axial direction to seal the openings at both ends of the speed reducer. The second pressure plate has a first gas channel and a second gas channel. The first gas channel... Both the first gas channel and the second gas channel are connected to the mounting cavity through the opening; an inflation sealing tester and / or an extraction sealing tester, wherein the inflation sealing tester is used to inflate the mounting cavity through the first gas channel and test the airtightness of the mounting cavity, and the extraction sealing tester is used to extract air from the mounting cavity through the second gas channel and test the airtightness of the mounting cavity; a sealing cover, wherein the sealing cover is connected to one of the first pressure plate or the second pressure plate, and is adapted to seal against the outer ring and the inner ring of the bearing, wherein the sealing cover is adapted to be located on one side of the groove along the axial direction of the reducer, and together with the outer ring, the inner ring and the first oil seal, forms a test cavity, and the sealing cover is provided with a pressure sensor.

[0005] According to the air tightness testing device of this disclosure, an inflation air tightness tester is used to inflate the mounting cavity through a first gas channel and test the air tightness of the mounting cavity, and an extraction air tightness tester is used to extract air from the mounting cavity through a second gas channel and test the air tightness of the mounting cavity. Since two air tightness testers can be connected simultaneously, there is no need to change the air tightness tester when changing the test mode, which simplifies the test process and reduces the test time. The sealing cover is suitable for sealing and fitting with the outer ring and inner ring of the bearing. The sealing cover is suitable for being located on one side of the groove along the axial direction of the reducer, and together with the outer ring, inner ring and first oil seal, it forms a test cavity. The sealing cover is equipped with a pressure sensor. In the extraction test mode and the inflation test mode, the air tightness of the reducer can be obtained based on the pressure change in the test cavity. On the one hand, because the test cavity is small in volume, it is sensitive to pressure changes and the measurement is more accurate. On the other hand, the test cavity can directly detect the leakage from the first oil seal, which can avoid the test results being affected by leakage from other parts, making the test results more accurate and reliable. On the other hand, since the air pressure change in the detection chamber is directly detected, there is no need to replace the airtightness tester when changing the detection mode, which simplifies the detection process and reduces the detection time.

[0006] In some embodiments of this disclosure, the groove has a slot facing the first pressure plate, the sealing cover is detachably connected to the first pressure plate, and the airtightness detection device further includes a driving member connected to the first pressure plate to drive the first pressure plate to move.

[0007] In some embodiments of this disclosure, the end of the sealing cover facing the first oil seal is recessed with a detection groove, the detection cavity includes the detection groove, and the air pressure sensor is disposed in the detection groove.

[0008] In some embodiments of this disclosure, the vertical projection of the groove lies within the vertical projection of the detection groove in a plane perpendicular to the first direction.

[0009] In some embodiments of this disclosure, a first sealing groove is provided on one end face of the first pressure plate facing the second pressure plate, the first sealing groove being adapted to be located on the outer periphery of the opening; a second sealing groove is provided on one end face of the second pressure plate facing the first pressure plate, the second sealing groove being adapted to be located on the outer periphery of the opening; the airtightness detection device further includes: a first sealing ring disposed in the first sealing groove; and a second sealing ring disposed in the second sealing groove.

[0010] In some embodiments of this disclosure, the bearing inner ring has a fastening hole that extends through the bearing inner ring along the bearing axial direction for installing a fastener. The head of the fastener is located on the side of the fastening hole facing the second pressure plate, and the projection of the end of the fastening hole facing the first pressure plate onto the first sealing ring falls entirely on the first sealing ring.

[0011] In some embodiments of this disclosure, the second pressure plate has a limiting protrusion on the side facing the first pressure plate, the limiting protrusion having a communicating channel, and the first gas channel communicating with the communicating channel.

[0012] In some embodiments of this disclosure, the end face of the second pressure plate facing the first pressure plate has a limiting groove, and the limiting protrusion is provided on the bottom wall of the limiting groove.

[0013] In some embodiments of this disclosure, the end face of the first pressure plate facing the second pressure plate is a plane, and the end face of the second pressure plate facing the first pressure plate is a plane.

[0014] In some embodiments of this disclosure, the inflation sealing tester includes: an inflation module and a pressure gauge, wherein the outlet of the inflation module is connected to the first gas channel, and the pressure gauge is used to detect the air pressure value of the mounting cavity; and / or, the vacuum sealing tester includes: a vacuum module and a vacuum gauge, wherein the suction port of the vacuum module is connected to the second gas channel, and the pressure gauge is used to detect the air pressure value of the mounting cavity. Attached Figure Description

[0015] Figure 1 This is a perspective view of the sealing cover of the airtightness testing device according to an embodiment of the present disclosure.

[0016] Figure 2 This is a front view of the airtightness testing device according to Embodiment 1 of this disclosure.

[0017] Figure 3 yes Figure 2 Sectional view at point AA.

[0018] Figure 4 This is a front view of the airtightness testing device according to Embodiment 2 of this disclosure.

[0019] Figure 5 yes Figure 4 Sectional view at point BB.

[0020] Figure 6 This is a front view of the airtightness testing device according to Embodiment 3 of this disclosure.

[0021] Figure 7 yes Figure 6Sectional view at point CC.

[0022] Figure label: 10. Air tightness testing device; 1. First pressure plate; 11. First sealing groove; 2. Second pressure plate; 21. First gas passage; 22. Second sealing groove; 23. Annular groove; 24. Limiting protrusion; 25. Limiting groove; 26. Second gas passage; 31. Sealing cover; 32. Sleeve; 33. Connecting rod; 331. Positioning hole; 34. Fixing structure; 35. Detection groove; 36. Detection cavity; 4. Drive components; 5. Test bench; 6. First sealing ring; 7. Second sealing ring; 20. Reducer; 201. Inner ring of bearing; 202. Outer ring of bearing; 203. First oil seal; 204. Second oil seal; 205. Rigid wheel; 206. Flexible wheel; 207. Front cover; 208. Rear cover; 209. Cam; 210. Mounting channel; 211. Mounting cavity; 213. Groove; 214. Fastening hole; 215. Fastener. Detailed Implementation

[0023] In this disclosure, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this disclosure should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0024] In the embodiments of this disclosure, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0025] In the description of embodiments of this disclosure, the term "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0026] In the description of the embodiments of the present disclosure, the term "and / or" refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and / or" is an association relationship describing associated objects, which means that there can be three relationships. For example, A and / or B can mean: A alone exists, both A and B exist, and B alone exists. In addition, in the present disclosure, the character " / " generally indicates that the associated objects before and after it are in an "or" relationship.

[0027] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and defined, the terms "mount", "connect" and "connection" shall be understood in a broad sense. For example, "connection" may be a detachable connection or a non-detachable connection; it may be a direct connection, or an indirect connection through an intermediate medium.

[0028] As used herein, "perpendicular", "equal" include the stated case and cases similar to the stated case, and the range of the similar cases is within an acceptable deviation range, where the acceptable deviation range is determined, for example, by a person of ordinary skill in the art in consideration of the measurement in discussion and the errors associated with the measurement of a specific quantity (that is, the limitations of the measurement system). For example, "perpendicular" includes absolute perpendicular and approximately perpendicular, where the acceptable deviation range of approximately perpendicular may be, for example, a deviation within 10°. "Equal" includes absolute equal and approximately equal, where the difference between the two approximately equal parts within the acceptable deviation range may be, for example, less than or equal to 10% of either of them.

[0029] In related art, a speed reducer, such as a harmonic speed reducer, comprises: a bearing inner ring, a bearing outer ring and an oil seal. The bearing outer ring is arranged on the circumferential outer side of the bearing inner ring and spaced apart from the bearing inner ring to form a groove, the oil seal is arranged in the groove, and the arrangement of the oil seal can play a role in preventing oil leakage. Therefore, it is very important to detect the sealing performance of the oil seal.

[0030] In the prior art, a sealing tool is generally used to fully seal the entire speed reducer, so as to ensure that no air leaks from other positions except the oil seal position, and then inflation and extraction are performed through an inflation and / or extraction member - an air cylinder. For example, when the air cylinder extends out, an air extraction test working condition is realized by using the bottom tool as an air outlet; for example, when the air cylinder is pushed in, an inflation test working condition is realized by using the bottom tool as an air inlet. A气密性检测仪 is used to detect the sealing performance of the oil seal, the same test is performed with a standard bearing part, if the pressure difference is within the allowable range, the product is qualified, and an excessively large pressure difference represents serious gas leakage. On one hand, the internal space of the speed reducer is large, so the air pressure change is not easy to detect; and if air leaks from other parts of the speed reducer, it will also affect the sealing performance detection of the oil seal, leading to an increase in measurement error.

[0031] On the other hand, the air tightness testers used for evacuation and inflation are different. For example, a vacuum gauge is needed when evacuating, while a pressure gauge is needed when inflation. Therefore, the air tightness tester needs to be changed in the two test conditions, which makes the process complicated and increases the working time.

[0032] According to the air tightness testing device of this disclosure, an inflation air tightness tester is used to inflate the mounting cavity through a first gas channel and test the air tightness of the mounting cavity, and an extraction air tightness tester is used to extract air from the mounting cavity through a second gas channel and test the air tightness of the mounting cavity. Since two air tightness testers can be connected simultaneously, there is no need to change the air tightness tester when changing the testing mode, which simplifies the testing process and reduces the testing time. The sealing cover is suitable for sealing and fitting with the outer ring and inner ring of the bearing. The sealing cover is suitable for being located on one side of the groove along the axial direction of the reducer, and together with the outer ring, inner ring and first oil seal, it forms a testing cavity. The sealing cover is equipped with a pressure sensor. In the extraction test mode and the inflation test mode, the air tightness of the reducer can be obtained based on the pressure change in the testing cavity. On the one hand, because the volume of the testing cavity is small, the pressure change is sensitive and the measurement is more accurate. On the other hand, the testing cavity can directly detect the leakage from the first oil seal, which can avoid the test results being affected by leakage from other parts, making the test results more accurate and reliable. On the other hand, since the air pressure change in the detection chamber is directly detected, there is no need to replace the airtightness tester when changing the detection mode, which simplifies the detection process and reduces the detection time.

[0033] An airtightness detection device according to an embodiment of the present disclosure is described below with reference to the accompanying drawings.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the air tightness testing device 10 according to an embodiment of the present disclosure includes: a first pressure plate 1, a second pressure plate 2, an inflation air tightness tester, an air extraction air tightness tester, and a sealing cover 31.

[0035] Specifically, refer to Figure 2 and Figure 3 As shown, the air tightness testing device 10 is used to test the air tightness of the reducer 20. The reducer 20 includes: an inner bearing ring 201, an outer bearing ring 202, and a first oil seal 203. The outer bearing ring 202 is located circumferentially outside the inner bearing ring 201 and is spaced apart from the inner bearing ring 201 to form a groove 213. The first oil seal 203 is located in the groove 213. The reducer 20 has a mounting cavity 211, which is connected to the groove 213.

[0036] It should be noted that the reducer 20 also includes a rigid wheel 205, which is located on one side of the bearing inner ring 201 along the axis of the reducer 20 and is connected to the bearing inner ring 201. The bearing inner ring 201, the bearing outer ring 202 and the rigid wheel 205 define an installation cavity 211.

[0037] Additionally, please see Figure 4 and Figure 5 As shown, the reducer 20 may also include a front cover 207 and a rear cover 208. The front cover 207 covers one end of the bearing inner ring 201 and the bearing outer ring 202 along the axis of the reducer 20, and the rear cover 208 covers the other end of the bearing inner ring 201 and the bearing outer ring 202 along the axis of the reducer 20. The bearing inner ring 201, the bearing outer ring 202, the front cover 207 and the rear cover 208 define a mounting cavity 211.

[0038] For further information, please refer back to [link / reference]. Figure 2 and Figure 3 As shown, the first pressure plate 1 and the second pressure plate 2 are along the first direction (e.g., Figure 3 The first pressure plate 1 and the second pressure plate 2 are arranged relative to each other in the first direction and can move relative to each other in the first direction. The first pressure plate 1 and the second pressure plate 2 are adapted to clamp the reducer 20 along the axial direction of the reducer 20 to block the openings at both ends of the reducer 20 in the axial direction. This achieves the sealing of the mounting cavity 211 and ensures that the leakage point is located at the first oil seal 203, thereby improving the accuracy and reliability of the detection.

[0039] The first pressure plate 1 and the second pressure plate 2 are arranged opposite to each other along the first direction and can move relative to each other along the first direction. This can be that the first pressure plate 1 is fixed and the second pressure plate 2 can move along the first direction, or the second pressure plate 2 is fixed and the first pressure plate 1 can move along the first direction, or both the first pressure plate 1 and the second pressure plate 2 can move along the first direction.

[0040] For further information, please refer to [link / reference]. Figure 2 and Figure 3 As shown, the second pressure plate 2 has a first gas channel 21 and a second gas channel 26, both of which are connected to the mounting cavity 211 through openings; the inflation sealing tester is used to inflate the mounting cavity 211 through the first gas channel 21 and test the airtightness of the mounting cavity 211, and the degassing sealing tester is used to degas the mounting cavity 211 through the second gas channel 26 and test the airtightness of the mounting cavity 211.

[0041] Therefore, by connecting an inflation-sealing tester to the connecting pipe that connects to the first gas channel 21, an inflation-sealing test mode can be realized. By connecting an air extraction-sealing tester to the connecting pipe that connects to the second gas channel 26, an air extraction-sealing test mode can be realized. Since two air extraction testers can be connected simultaneously, there is no need to change the air extraction tester when changing the test mode, which simplifies the test procedure and reduces the test time.

[0042] For further information, please refer back to [link / reference]. Figure 1 and combined Figure 2 and Figure 3 As shown, the sealing cover 31 is connected to one of the first pressure plate 1 or the second pressure plate 2, and is adapted to be sealed and fitted with the outer ring 202 and the inner ring 201 of the bearing. The sealing cover 31 is adapted to be located on one side of the groove 213 along the axial direction of the reducer 20, and together with the outer ring 202, the inner ring 201 and the first oil seal 203, it forms a detection cavity 36. A pressure sensor is provided on the sealing cover 31.

[0043] Understandably, in the inflation test mode, the inflation sealing tester inflates the mounting cavity 211 through the first gas channel 21. After the air pressure in the testing cavity 36 stabilizes, the air pressure in the testing cavity 36 is obtained through the air pressure sensor. If the air pressure increases, it indicates gas leakage. If the air pressure increases to a certain value, it indicates that the air tightness is not up to standard. If the air pressure does not change, it indicates that the sealing is good.

[0044] Similarly, in the air extraction test mode, the air extraction sealing tester extracts air from the installation cavity 211 through the second gas channel 26. After the air pressure in the detection cavity 36 stabilizes, the air pressure in the detection cavity 36 is obtained through the air pressure sensor. If the air pressure decreases, it indicates gas leakage. If the air pressure decreases to a certain value, it indicates that the air tightness is not up to standard. If the air pressure does not change, it indicates that the air tightness is good.

[0045] Meanwhile, on the one hand, because the detection chamber 36, enclosed by the sealing cover 31, the outer ring 202 of the bearing, the inner ring 201 of the bearing, and the first oil seal 203, has a small volume, it is sensitive to changes in air pressure, making the measurement more accurate. Furthermore, since the detection chamber 36 can directly detect the leakage from the first oil seal 203, it avoids the influence of leaks from other parts on the test results, thus making the test results more accurate and reliable. On the other hand, because the air pressure change in the detection chamber 36 is directly detected, there is no need to change the airtightness tester when changing the test mode, simplifying the testing process and reducing testing time. Simultaneously, the test results from both the inflation-sealing tester and the vacuum-sealing tester are used for mutual verification, further improving the accuracy of the test.

[0046] For further information, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3As shown, the airtightness testing device 10 further includes: a connecting rod 33, a sleeve 32, and a fixing structure 34. The sleeve 32 is connected to the first pressure plate 1, and has a movable space extending in a first direction, which passes through the end of the sleeve 32 opposite to the first pressure plate 1; one end of the connecting rod 33 is connected to the sealing cover 31, and the other end is movably disposed in the movable space in the first direction; the fixing structure 34 is disposed on the sleeve 32 and is used to lock the sleeve 32 and the connecting rod 33.

[0047] Through the above settings, the sealing cover 31 can be extended and retracted along the first direction, i.e., its length is adjustable, so as to adapt to the reducer 20 with different installation positions of the first oil seal 203 along the first direction, so as to achieve better sealing and fit between the sealing cover 31 and the outer ring 202 and the inner ring 201 of the bearing, thereby further improving the sealing performance of the detection cavity 36, and further improving the reliability and accuracy of the detection.

[0048] For further information, please refer to [link / reference]. Figure 1 As shown, the connecting rod 33 has multiple positioning holes 331 spaced apart along the first direction, and the fixing structure 34 is adapted to mate with one of the positioning holes 331. This achieves telescoping (length adjustment) along the first direction, adapting to different installation positions of the first oil seal 203 along the first direction of the reducer 20. This ensures a better sealing fit between the sealing cover 31 and the outer ring 202 and inner ring 201 of the bearing, further improving the sealing performance of the detection chamber 36, and thus further improving the reliability and accuracy of the detection. The fixing structure 34 can be a threaded fastener 215 or a pin, etc.

[0049] For further information, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 As shown, the airtightness testing device 10 also includes a test bench 5, on which the first pressure plate 1 and the second pressure plate 2 are disposed, thereby realizing the stable testing of the reducer 20. It should be noted that the first direction can be the up and down direction. For example, in this disclosure, the second pressure plate 2 is located below the first pressure plate 1, but this disclosure is not limited to this. The first direction can also be the left and right direction, etc.

[0050] According to the airtightness testing device 10 of this disclosure, an inflation airtightness tester is used to inflate the mounting cavity 211 through the first gas channel 21 and test the airtightness of the mounting cavity 211, and an extraction airtightness tester is used to extract air from the mounting cavity 211 through the second gas channel 26 and test the airtightness of the mounting cavity 211. Since two airtightness testers can be connected simultaneously, there is no need to change the airtightness tester when changing the testing mode, which simplifies the testing process and reduces the testing time; while the sealing cover 31 is adapted to seal and fit with the bearing outer ring 202 and the bearing inner ring 201, and the sealing cover 31 is adapted to be located at The groove 213, along one side of the reducer 20's axial direction, together with the bearing outer ring 202, bearing inner ring 201, and first oil seal 203, forms a detection chamber 36. A pressure sensor is installed on the sealing cover 31. In both the vacuum test mode and the inflation test mode, the airtightness of the reducer 20 can be obtained based on the pressure changes in the detection chamber 36. Firstly, because the detection chamber 36 is small and sensitive to pressure changes, the measurement is more accurate. Secondly, the detection chamber 36 can directly detect the leakage from the first oil seal 203, avoiding the influence of leaks from other parts on the test results, making the test results more accurate and reliable. Furthermore, since the pressure change in the detection chamber 36 is directly detected, there is no need to change the airtightness tester when changing the test mode, simplifying the testing process and reducing testing time.

[0051] Please refer to some embodiments of this disclosure. Figure 1 , Figure 2 and Figure 3 As shown, the groove 213 has a slot facing the first pressure plate 1, the sealing cover 31 is detachably connected to the first pressure plate 1, and the airtightness testing device 10 further includes a driving member 4, which is connected to the first pressure plate 1 to drive the first pressure plate 1 to move.

[0052] It is understood that the first pressure plate 1 is moved by the driving component 4, wherein the first pressure plate 1 moves toward or away from the second pressure plate 2. For example, in this disclosure, the driving component 4 drives the first pressure plate 1 to move toward the second pressure plate 2, so that the first pressure plate 1 and the second pressure plate 2 can work together to press the two ends of the reducer 20 axially, thereby sealing the openings at both ends of the reducer 20 axially, further ensuring that the air leakage is only at the first oil seal 203, and improving the reliability of the test.

[0053] In addition, the sealing cover 31 is detachably connected to the first pressure plate 1. As the driving component 4 drives the first pressure plate 1 to move toward the second pressure plate 2 to press the two ends of the reducer 20 in the axial direction, the sealing cover 31 can also press the outer ring 202 and the inner ring 201 of the bearing under the action of the driving component 4. This prevents gas from leaking from the gap between the outer ring 202 and the sealing cover 31 and the gap between the inner ring 201 and the sealing cover 31, further improving the sealing performance of the detection chamber 36, thereby further improving the accuracy and reliability of the detection.

[0054] Meanwhile, the driving component 4 can be connected to the first pressure plate 1, or there may be no connection between them. For example, in this disclosure, when the first direction is up and down and the driving component 4 is above the first pressure plate 1, the driving component 4 does not need to be connected to the first pressure plate 1 to ensure that the first pressure plate 1 is stably placed on the test table 5. However, when the first direction is left and right or front and back, the driving component 4 needs to be connected to the first pressure plate 1 in order to ensure that the first pressure plate 1 does not fall off the test table 5 under the action of gravity.

[0055] For further information, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 As shown, the airtightness testing device 10 also includes a pressure equalizing plate. The output shaft of the drive unit 4 is connected to the pressure equalizing plate. The test bench 5 has a guide rail extending along the first direction (the guide rail can be in the form of a guide rod or a guide groove). The pressure equalizing plate is movably disposed on the guide rail along the first direction. The arrangement of the pressure equalizing plate allows the pressure to be distributed more evenly on the first pressure plate 1, thereby further improving the sealing effect on the two ends of the reducer 20 in the axial direction.

[0056] It should be noted that the driving component 4 can be a cylinder, but this disclosure is not limited to this. The driving component 4 can also be other structures, such as a motor, a hydraulic cylinder, etc.

[0057] Please refer to some embodiments of this disclosure. Figure 1 , Figure 2 and Figure 3 As shown, the end of the sealing cover 31 facing the first oil seal 203 has a recessed detection groove 35. The detection cavity 36 includes the detection groove 35, and the pressure sensor is disposed within the detection groove 35. It can be understood that the formation of the detection groove 35 increases the volume of the detection cavity 36, thereby accommodating a certain amount of gas and preventing the pressure sensor from malfunctioning and the sealing cover 31 from failing due to excessive pressure. Furthermore, in a plane perpendicular to the first direction, the outer contour of the vertical projection of the detection groove 35 is also annular.

[0058] Please refer to some embodiments of this disclosure. Figure 1 , Figure 2 and Figure 3 As shown, in a plane perpendicular to the first direction, the vertical projection of the groove 213 lies within the vertical projection of the detection groove 35. This allows gas leaking from the first oil seal 203 to completely enter the detection groove 35, and ensures that gas drawn from the first oil seal 203 into the mounting cavity 211 originates solely from the detection cavity 36, further improving the sealing performance of the detection cavity 36 and enhancing the reliability and accuracy of the detection.

[0059] Please refer to some embodiments of this disclosure. Figure 1 , Figure 2 and Figure 3 As shown, a first sealing groove 11 is provided on the end face of the first pressure plate 1 facing the second pressure plate 2. The first sealing groove 11 is adapted to be located on the outer periphery of the opening. A second sealing groove 22 is provided on the end face of the second pressure plate 2 facing the first pressure plate 1. The second sealing groove 22 is adapted to be located on the outer periphery of the opening. The airtightness detection device 10 also includes: a first sealing ring 6 and a second sealing ring 7. The first sealing ring 6 is disposed in the first sealing groove 11; the second sealing ring 7 is disposed in the second sealing groove 22.

[0060] It is understandable that by setting the first sealing groove 11 and the second sealing groove 22, and respectively setting the first sealing ring 6 and the second sealing ring 7 therein, the sealing performance of the first pressure plate 1 and the second pressure plate 2 when pressing the reducer 20 can be effectively enhanced. This can better prevent gas from leaking from the contact surface of the first pressure plate 1 and the second pressure plate 2, thereby further ensuring the reliability and accuracy of the test results. The first sealing ring 6 and the second sealing ring 7 can be selected from different materials and specifications according to actual use requirements to meet the sealing requirements under different working conditions.

[0061] Please refer to some embodiments of this disclosure. Figure 2 and Figure 3 As shown, the bearing inner ring 201 has a fastening hole 214 that passes through the bearing inner ring 201 along the bearing axial direction for installing a fastener 215. The head of the fastener 215 is located on the side of the fastening hole 214 facing the second pressure plate 2, and the projection of the end of the fastening hole 214 facing the first pressure plate 1 onto the first sealing ring 6 falls completely on the first sealing ring 6.

[0062] It is understood that the reducer 20 also includes a flexible wheel 206, which is located in the mounting cavity 211 and on one side of the bearing inner ring 201 in the axial direction. The flexible wheel 206 is connected to the bearing inner ring 201 by fasteners 215. The projection of the end of the fastening hole 214 facing the first pressure plate 1 onto the first sealing ring 6 falls completely on the first sealing ring 6, thereby achieving the sealing of the fastening hole 214 by the first sealing ring 6, thus preventing gas leakage from the fastening hole 214, thereby further improving the sealing performance of the first pressure plate 1 and the second pressure plate 2 when pressing the reducer 20.

[0063] Please refer to some embodiments of this disclosure. Figure 2 and Figure 3 As shown, the second pressure plate 2 has a first gas channel 21 and a second gas channel 26. The side of the second pressure plate 2 facing the first pressure plate 1 has a limiting protrusion 24, and the limiting protrusion 24 has a connecting channel. The first gas channel 21 and the connecting channel are connected.

[0064] It is understandable that at least a portion of the limiting protrusion 24 extends into the mounting cavity 211, and the rigid wheel 205 is arranged around the limiting protrusion 24. Thus, the setting of the limiting protrusion 24 serves two purposes: firstly, it positions and limits the reducer 20, thereby ensuring that the reducer 20 is installed accurately and reliably on the second pressure plate 2; secondly, it allows gas to better enter the mounting cavity 211, preventing gas from being discharged to the outside.

[0065] Please continue reading Figure 4 and Figure 5 As shown, when the reducer 20 includes a cam 209, the cam 209 extends through both ends of the reducer 20 along its axial direction. At least a portion of the cam 209 is located in the mounting cavity 211. The cam 209 has a mounting channel 210 extending through it along its axial direction. A limiting protrusion 24 is located in the mounting channel 210 and engages with the inner wall of the mounting channel 210 to achieve limiting installation of the reducer 20. Simultaneously, the end of the cam 209 facing the first pressure plate 1 is not completely sealed to the first pressure plate 1, and the end of the cam 209 facing the second pressure plate 2 is not completely sealed to the second pressure plate 2, thereby achieving communication between the mounting channel 210 and the mounting cavity 211.

[0066] Please refer to some embodiments of this disclosure. Figure 4 and Figure 5 As shown, the end of the second pressure plate 2 facing the first pressure plate 1 has a limiting groove 25, and a limiting protrusion 24 is provided on the bottom wall of the limiting groove 25. It can be understood that the end of the cam 209 facing the second pressure plate 2 is located in the limiting groove 25. Thus, through the interaction between the limiting protrusion 24 and the limiting groove 25, the installation stability of the reducer 20 on the second pressure plate 2 is further improved.

[0067] Please refer to some embodiments of this disclosure. Figure 6 and Figure 7 As shown, the end face of the first pressure plate 1 facing the second pressure plate 2 is a plane, and the end face of the second pressure plate 2 facing the first pressure plate 1 is a plane.

[0068] It is understood that the reducer 20 also includes: a second oil seal 204, with a second oil seal 204 circumferentially arranged in the openings at both ends of the reducer 20 in the axial direction, the second oil seal 204 facing the first pressure plate 1 in the axial direction of the reducer 20 being sealed and fitted with the first pressure plate 1, and the second oil seal 204 facing the second pressure plate 2 in the axial direction of the reducer 20 being sealed and fitted with the second pressure plate 2.

[0069] At this time, since the end face of the first pressure plate 1 facing the second pressure plate 2 is a plane, and the end face of the second pressure plate 2 facing the first pressure plate 1 is a plane, the reducer 20 and the first pressure plate 1 are sealed only by the second oil seal 204, and the reducer 20 and the second pressure plate 2 are sealed only by the second oil seal 204, so the sealing performance of the second oil seal 204 can be measured.

[0070] The specific operation is as follows: First, confirm that the sealing performance of the first oil seal 203 is good. Then, use an inflation sealing tester to inflate the mounting cavity 211 through the first gas channel 21 to test the air tightness during inflation. Alternatively, use an extraction sealing tester to extract air into the mounting cavity 211 through the second gas channel 26 to test the air tightness during extraction. Then, compare the results with the bearing standard parts. If the difference is within a reasonable range, the test is considered qualified. If the difference exceeds a certain value, the test is considered unqualified.

[0071] In some embodiments of this disclosure, the inflation and sealing tester includes an inflation module and a pressure gauge. The outlet of the inflation module is connected to the first gas channel 21, and the pressure gauge is used to detect the air pressure value of the mounting cavity 211. Thus, inflation and testing are integrated, simplifying the testing process and eliminating the need to change instruments between inflation and testing.

[0072] In some embodiments of this disclosure, the air-sealing tester includes an air-vacuum module and a vacuum gauge. The air intake of the air-vacuum module is connected to the second gas channel 26, and the pressure gauge is used to detect the air pressure value of the mounting cavity 211. This integrates air-vacuuming and testing, simplifying the testing process and eliminating the need to change instruments between air-vacuuming and testing.

[0073] In the description of this specification, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples without contradicting each other.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. An airtightness testing device for testing the airtightness of a speed reducer (20), the speed reducer (20) comprising: The bearing comprises an inner ring (201), an outer ring (202), and a first oil seal (203). The outer ring (202) is located circumferentially outside the inner ring (201) and spaced apart from the inner ring (201) to form a groove (213). The first oil seal (203) is located within the groove (213). The reducer (20) has a mounting cavity (211) communicating with the groove (213). The reducer is characterized by comprising: A first pressure plate (1) and a second pressure plate (2) are arranged opposite to each other along a first direction and can move relative to each other along the first direction. The first pressure plate (1) and the second pressure plate (2) are adapted to clamp the reducer (20) along the axial direction of the reducer (20) to block the openings at both ends of the reducer (20) along the axial direction. The second pressure plate (2) has a first gas channel (21) and a second gas channel (26). The first gas channel (21) and the second gas channel (26) are both connected to the mounting cavity (211) through the opening. An inflation-sealing tester and / or an air-evacuation-sealing tester, wherein the inflation-sealing tester is used to inflate the mounting cavity (211) through the first gas channel (21) and test the air tightness of the mounting cavity (211), and the air-evacuation-sealing tester is used to evacuate air from the mounting cavity (211) through the second gas channel (26) and test the air tightness of the mounting cavity (211); A sealing cover (31) is connected to one of the first pressure plate (1) or the second pressure plate (2) and is adapted to be sealed and fitted to the outer ring (202) and the inner ring (201) of the bearing. The sealing cover (31) is adapted to be located on one side of the groove (213) along the axial direction of the reducer (20) and together with the outer ring (202), the inner ring (201) of the bearing and the first oil seal (203) to form a detection cavity (36). A pressure sensor is provided on the sealing cover (31).

2. The airtightness testing device according to claim 1, characterized in that, The groove (213) has an opening facing the first pressure plate (1), the sealing cover (31) is detachably connected to the first pressure plate (1), and the airtightness testing device further includes: A driving component (4) is connected to the first pressure plate (1) to drive the first pressure plate (1) to move.

3. The airtightness testing device according to claim 1, characterized in that, The sealing cover (31) has a detection groove (35) recessed at one end facing the first oil seal (203), the detection cavity (36) includes the detection groove (35), and the air pressure sensor is disposed in the detection groove (35).

4. The airtightness testing device according to claim 3, characterized in that, In a plane perpendicular to the first direction, the vertical projection of the groove (213) lies within the vertical projection of the detection groove (35).

5. The airtightness testing device according to claim 1, characterized in that, The first pressure plate (1) has a first sealing groove (11) on one end face facing the second pressure plate (2), the first sealing groove (11) being adapted to be located on the outer periphery of the opening; the second pressure plate (2) has a second sealing groove (22) on one end face facing the first pressure plate (1), the second sealing groove (22) being adapted to be located on the outer periphery of the opening; the airtightness detection device further includes: The first sealing ring (6) is disposed in the first sealing groove (11); The second sealing ring (7) is disposed in the second sealing groove (22).

6. The airtightness testing device according to claim 5, characterized in that, The bearing inner ring (201) has a fastening hole (214) that passes through the bearing inner ring (201) along the bearing axial direction for installing a fastener (215). The head of the fastener (215) is located on the side of the fastening hole (214) facing the second pressure plate (2). The projection of the end of the fastening hole (214) facing the first pressure plate (1) onto the first sealing ring (6) falls completely on the first sealing ring (6).

7. The airtightness testing device according to claim 1, characterized in that, The second pressure plate (2) has a limiting protrusion (24) on the side facing the first pressure plate (1), and the limiting protrusion (24) has a connecting channel, and the first gas channel (21) is connected to the connecting channel.

8. The airtightness testing device according to claim 7, characterized in that, The end face of the second pressure plate (2) facing the first pressure plate (1) has a limiting groove (25), and the limiting protrusion (24) is provided on the bottom wall of the limiting groove (25).

9. The airtightness testing device according to claim 1, characterized in that, The end face of the first pressure plate (1) facing the second pressure plate (2) is a plane, and the end face of the second pressure plate (2) facing the first pressure plate (1) is a plane.

10. The airtightness testing device according to claim 1, characterized in that, The inflation sealing tester includes an inflation module and a pressure gauge. The air outlet of the inflation module is connected to the first gas channel (21), and the pressure gauge is used to detect the air pressure value of the mounting cavity (211). And / or, the air extraction sealing tester includes: an air extraction module and a vacuum gauge, wherein the air intake of the air extraction module is connected to the second gas channel (26), and the pressure gauge is used to detect the air pressure value of the mounting cavity (211).

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