Harmonic reducer air tightness detection device

Abstract

The application provides a harmonic reducer air tightness detection device, which comprises a workbench and a pressing plate assembly arranged on the workbench; the pressing plate assembly comprises a first pressing plate and a second pressing plate, the first pressing plate and / or the second pressing plate is provided with a placing groove capable of accommodating a reducer to be detected, the first pressing plate is provided with a first air passage for communicating with an external air pressure adjusting device, and the first pressing plate or the second pressing plate is provided with a second air passage for communicating with the external air pressure adjusting device; the first pressing plate and the second pressing plate can be sealedly buckled along a first direction, the first pressing plate can be in sealed contact with a flexspline end surface of the reducer to be detected, and the second pressing plate can be in sealed contact with a rigid wheel end surface of the reducer to be detected, so that an internal cavity sealed by an oil seal of the reducer to be detected is isolated from a space in the placing groove, and the internal cavity sealed by the oil seal of the reducer to be detected is only communicated with the first air passage, and the space in the placing groove is only communicated with the second air passage. The air tightness of the harmonic reducer before installation and use is detected.

Description

Technical Field

[0001] This application relates to the field of sealing test technology, specifically to a device for testing the air tightness of a harmonic reducer. Background Technology

[0002] Harmonic reducers mainly consist of a rigid wheel, a flexible wheel, and a wave generator. They are gear transmission structures that transmit motion and power by having the flexible wheel undergo controllable elastic deformation through the wave generator, which then meshes with the rigid wheel. Typically, the core components of a harmonic reducer rely heavily on an important intermediate connecting component: the crossed roller bearing. The rigid wheel is securely fastened to the inner ring of the crossed roller bearing, and the flexible wheel is securely fastened to the outer ring of the crossed roller bearing, thus enabling the crossed roller bearing to provide support and positioning.

[0003] Meanwhile, crossed roller bearings also play an important sealing role, with an oil seal located on the outer periphery of the top of the bearing. If the sealing performance of the crossed roller bearing is insufficient, oil leakage will occur when it is installed in the harmonic reducer, preventing proper lubrication of the crossed roller bearing and the inside of the harmonic reducer, accelerating structural wear, and significantly shortening the lifespan of the harmonic reducer.

[0004] Therefore, it is necessary to test the airtightness of the harmonic reducer before it is put into use. Utility Model Content

[0005] In view of this, this application provides a harmonic reducer air tightness testing device to solve the problem of how to perform air tightness testing on harmonic reducers before installation and use in the prior art.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A harmonic reducer air tightness testing device includes a worktable and a pressure plate assembly disposed on the worktable;

[0008] The pressure plate assembly includes a first pressure plate and a second pressure plate. The first pressure plate and / or the second pressure plate are provided with a placement groove that can accommodate the reducer to be tested. The first pressure plate has a first air passage for communicating with an external air pressure regulating device. The first pressure plate or the second pressure plate has a second air passage for communicating with an external air pressure regulating device.

[0009] The first pressure plate and the second pressure plate can be sealed and fastened together in a first direction, and the first pressure plate can be sealed and contacted with the flexible wheel end face of the reducer under test, and the second pressure plate can be sealed and contacted with the rigid wheel end face of the reducer under test, so that the internal cavity sealed by the oil seal of the reducer under test is isolated from the space in the placement groove, and the internal cavity sealed by the oil seal of the reducer under test is only connected to the first vent, and the space in the placement groove is only connected to the second vent.

[0010] Optionally, the placement groove provided on the first pressure plate is a first placement groove, and a first sealing gasket is provided in the first placement groove. The first sealing gasket can at least seal the inner side of the screw hole on the end face of the flex wheel of the reducer under test.

[0011] The placement groove provided on the second pressure plate is a second placement groove, and a second sealing gasket is provided in the second placement groove. The second sealing gasket can at least seal the screw hole on the end face of the gear wheel of the reducer under test.

[0012] Optionally, the first pressure plate has a first mounting blind hole, which is opposite to the first sealing gasket along the first direction, and the first mounting blind hole is used for bolts passing through the first sealing gasket to be fastened.

[0013] The second pressure plate has a second mounting blind hole, which is opposite to the second sealing gasket along the first direction, and is used for bolts passing through the second sealing gasket to be fastened.

[0014] Optionally, the second vent is disposed on the first pressure plate, located radially outside the first sealing gasket;

[0015] The first vent is located radially inside the first sealing gasket.

[0016] Optionally, the placement groove provided on the first pressure plate is a first placement groove, and the placement groove provided on the second pressure plate is a second placement groove;

[0017] The second ventilation duct is disposed on the first pressure plate. The second ventilation duct includes a main duct section and a secondary duct section. On a projection plane perpendicular to the first direction, the orthographic projection of the main duct section is located within the orthographic projection of the first placement slot, and the orthographic projection of the secondary duct section is located outside the orthographic projection of the first placement slot.

[0018] When the first pressure plate and the second pressure plate are sealed and fastened, the auxiliary channel is connected to the second placement groove along the first direction.

[0019] Optionally, the opening of the second placement groove is chamfered, and the chamfer covers the secondary channel in the radial direction of the second placement groove.

[0020] Optionally, a sealing ring groove is provided on the surface of the first pressure plate facing the second pressure plate. The sealing ring groove is located in the circumference of the placement groove, and a third sealing gasket protruding from the surface of the first pressure plate is provided in the sealing ring groove.

[0021] Optionally, a pipe fitting is inserted into the end of the first ventilation duct and / or the end of the second ventilation duct.

[0022] Optionally, a power mechanism may also be included;

[0023] The workbench includes a base and a top seat. The power mechanism is mounted on the top seat, and the first pressure plate is mounted on the base. The power mechanism can drive the second pressure plate to reciprocate along the first direction and can apply pressure to the second pressure plate.

[0024] Optionally, the first pressure plate is detachably connected to the base, and the first pressure plate has several different sizes.

[0025] The second pressure plate is detachably connected to the power mechanism, and the second pressure plate has several different sizes.

[0026] The harmonic reducer air tightness testing device provided in this application includes a workbench and a pressure plate assembly disposed on the workbench; the pressure plate assembly includes a first pressure plate and a second pressure plate, the first pressure plate and / or the second pressure plate are provided with a placement groove for accommodating the reducer under test, the first pressure plate has a first vent for communicating with an external air pressure regulating device, and the first pressure plate or the second pressure plate has a second vent for communicating with an external air pressure regulating device; the first pressure plate and the second pressure plate can be sealed and fastened together in a first direction, and the first pressure plate can be sealed and contacted with the flexible wheel end face of the reducer under test, and the second pressure plate can be sealed and contacted with the rigid wheel end face of the reducer under test, so that the internal cavity sealed by the oil seal of the reducer under test is isolated from the space in the placement groove, and the internal cavity sealed by the oil seal of the reducer under test is only connected to the first vent, and the space in the placement groove is only connected to the second vent. This setup ensures the reducer under test is completely sealed, thus identifying the oil seal as the only leak point. Since the oil seal's sealing function prevents oil from leaking from the internal cavity to the outside, creating a closed space within the oil seal-sealed cavity of the reducer under test, filling this space with gas and monitoring the pressure, provides feedback on the reducer's sealing performance. After placing the reducer under test in the placement slot and engaging the pressure plate assembly, the inner side of the oil seal (the sealed internal cavity) connects to the first vent, and the outer side connects to the second vent. The pressure regulating device can either pressurize or depressurize the first vent, or pressurize or depressurize the second vent. The system employs a two-stage venting method. For example, a rated amount of gas is introduced into the first vent, passing through the gaps between the rigid and flexible gears to create a pressurized environment inside the oil seal. Simultaneously, a set amount of gas is extracted and discharged through the second vent, or only the rated amount of gas is extracted through the second vent. This creates a pressure difference between the inside and outside of the oil seal. By measuring the air pressure using these two methods and comparing it with the air pressure of the standard components of the reducer, the pressure difference is considered acceptable if it is within the allowable range. An excessively large pressure difference indicates serious gas leakage and substandard sealing performance. This method solves the problem of how to perform airtightness testing on harmonic reducers before installation and use in existing technologies. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the reducer under test provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the reducer under test in the pressure plate assembly provided in an embodiment of this application;

[0030] Figure 3 A cross-sectional schematic diagram of the pressure plate assembly provided in the embodiments of this application;

[0031] Figure 4 A schematic diagram of the first pressure plate provided in an embodiment of this application;

[0032] Figure 5 This is an overall schematic diagram of the harmonic reducer air tightness testing device provided in the embodiments of this application.

[0033] exist Figures 1-5 middle:

[0034] 100. Reducer under test; 110. Flexible wheel; 120. Rigid wheel; 130. Crossed roller bearing; 1301. Oil seal;

[0035] 1. First pressure plate; 2. Second pressure plate; 3. First sealing gasket; 4. Second sealing gasket; 5. Sealing ring; 6. Pipe fitting; 7. Power mechanism; 8. Base; 9. Top seat;

[0036] 11. First airway; 12. Second airway;

[0037] 1201. Main Road Division; 1202. Secondary Road Division;

[0038] 101. First placement slot; 102. First mounting blind hole;

[0039] 201. Second placement slot; 202. Second mounting blind hole. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] We know that after the harmonic reducer is assembled, one side of the whole machine is the flange end face of the flexible wheel 110, and the other side is the end face of the rigid wheel 120. The position of the crossed roller bearing 130 is as follows: Figure 1 As shown, the position of oil seal 1301 is as follows Figure 1 As shown in the image.

[0042] like Figures 2-5 As shown in the figure, this application provides a harmonic reducer air tightness testing device, including a workbench and a pressure plate assembly disposed on the workbench; the pressure plate assembly includes a first pressure plate 1 and a second pressure plate 2, the first pressure plate 1 and / or the second pressure plate 2 are provided with a placement groove for accommodating the reducer 100 to be tested, the first pressure plate 1 has a first vent 11 for communicating with an external air pressure regulating device, and the first pressure plate 1 or the second pressure plate 2 has a second vent 12 for communicating with an external air pressure regulating device; the first pressure plate 1 and the second pressure plate 2... Plate 2 can be sealed and engaged along the first direction, and can also be separated along the first direction. The first pressure plate 1 can make sealed contact with the end face of the flexible wheel 110 of the reducer under test 100, and the second pressure plate 2 can make sealed contact with the end face of the rigid wheel 120 of the reducer under test 100. This isolates the internal cavity sealed by the oil seal 1301 of the reducer under test 100 from the space in the placement groove. Furthermore, the internal cavity sealed by the oil seal 1301 of the reducer under test 100 is only connected to the first vent 11, and the space in the placement groove is only connected to the second vent 12. The air pressure regulating device can perform positive pressure regulation and negative pressure regulation.

[0043] This setup ensures that the reducer 100 under test is completely sealed, thus identifying the only leakage point as oil seal 1301. Since the oil seal 1301's sealing function prevents oil from leaking from the internal cavity to the outside, creating a closed space by filling this space with gas and monitoring the pressure provides feedback on the reducer's sealing performance. After placing the reducer 100 in the placement slot and engaging the pressure plate assembly, the inner side of oil seal 1301, which seals the internal cavity, connects to the first vent 11, while the outer side connects to the second vent 12. Since the pressure regulating device can either fill or depress the first vent 11 or the second vent 12, this... For example, at least two detection methods can be obtained. One method is to introduce a rated amount of gas into the first vent 11, and through the tooth gap of the rigid wheel 120 and the flexible wheel 110, to create a pressurized environment inside the oil seal 1301. At the same time, the second vent 12 evacuates and discharges a set amount of gas. The other method is to only evacuate a rated amount of gas through the second vent 12, without performing any inflation or deflation operation on the first vent 11. Both methods achieve a certain pressure difference between the inside and outside of the oil seal 1301. The air pressure is measured and compared with the air pressure of the standard parts of the reducer. If the pressure difference is within the allowable range, it is considered qualified. If the pressure difference is too large, it indicates serious gas leakage and substandard sealing performance. This solves the problem of how to perform airtightness testing on harmonic reducers before installation and use in the prior art.

[0044] It should be noted that in this application, pressure detection is performed by a sensor. Since the sensor requires an electrical control connection, the pressure detection point is set in the external pipeline connected to the ventilation duct so that the sensor can communicate with the electrical control box.

[0045] In some specific embodiments, the first pressure plate 1 is provided with a first placement groove 101, in which a first sealing gasket 3 is provided. The first sealing gasket 3 is in contact with the end face of the flexible wheel 110 of the reducer 100 under test. The first sealing gasket 3 can at least seal the inner side of the screw hole on the end face of the flexible wheel 110 of the reducer 100 under test. Here, the inner side refers to the radial inner side. The second pressure plate 2 is provided with a second placement groove 201, in which a second sealing gasket 4 is provided. The second sealing gasket 4 is in contact with the end face of the rigid wheel 120 of the reducer 100 under test. The second sealing gasket 4 can at least seal the screw hole on the end face of the rigid wheel 120 of the reducer 100 under test.

[0046] With this configuration, the elastic deformation capability of the sealing ring is utilized, and the opposing compression of the test reducer 100 by the first pressure plate 1 and the second pressure plate 2 causes the first sealing gasket 3 and the second sealing gasket 4 to be in an interference fit state, thereby forming a precisely positioned circumferential seal at the corresponding position.

[0047] Furthermore, in some preferred embodiments, the first pressure plate 1 has a first mounting blind hole 102, which is opposite to the first sealing gasket 3 along a first direction, and is used for bolts passing through the first sealing gasket 3 to be fastened; the second pressure plate 2 has a second mounting blind hole 202, which is opposite to the second sealing gasket 4 along a first direction, and is used for bolts passing through the second sealing gasket 4 to be fastened.

[0048] With this setup, since the first sealing gasket 3 and the second sealing gasket 4 need to have a certain width in the radial direction, in order to ensure the reliability of the seal, the first sealing gasket 3 needs to be reliably fixed on the first pressure plate 1, and the second sealing gasket 4 needs to be reliably fixed on the second pressure plate 2. The reliability of the sealing ring can be ensured by the assembly method of screwing bolts into the blind hole.

[0049] In some optional embodiments, the second vent 12 is disposed on the first pressure plate 1, located radially outside the first sealing gasket 3; the first vent 11 is located radially inside the first sealing gasket 3. With this arrangement, when the position of the first pressure plate 1 is fixed, the vents are concentrated on the first pressure plate 1, which facilitates the flexible movement of the second pressure plate 2, while avoiding repeated bending of the connected pipelines and affecting their service life.

[0050] In some optional embodiments, the first pressure plate 1 is provided with a first placement groove 101, and the second pressure plate 2 is provided with a second placement groove 201; the second vent 12 is disposed on the first pressure plate 1, and the second vent 12 includes a main vent 1201 and a secondary vent 1202. On a projection plane perpendicular to the first direction, the orthographic projection of the main vent 1201 is located within the orthographic projection of the first placement groove 101, and the orthographic projection of the secondary vent 1202 is located outside the orthographic projection of the first placement groove 101; when the first pressure plate 1 and the second pressure plate 2 are sealed and fastened, the secondary vent 1202 and the second placement groove 201 are connected along the first direction.

[0051] In order to avoid the second air passage 12 having poor connectivity with the space in the second placement slot 201 due to only passing through the assembly gap of the harmonic reducer, the position of the second air passage 12 is moved radially outward. At a local position in the circumference of the first placement slot 101, the first pressure plate 1 has a partial subtractive structure, namely the auxiliary passage 1202, so as to realize a smoother air passage in the circumference of the reducer 100 under test, so as to connect to the space in the second placement slot 201, which is conducive to smooth air extraction and ensures test accuracy.

[0052] Furthermore, in some specific embodiments, the opening of the second placement slot 201 is chamfered, and the chamfer covers the secondary channel 1202 in the radial direction of the second placement slot 201, so that the secondary channel 1202 and the second placement slot 201 are connected in the first direction. With this configuration, the radial coverage area of ​​the second placement slot 201 is increased by providing a chamfer at the opening of the second placement slot 201, without increasing the radial dimension of the main body of the second placement slot 201, thus achieving better communication between the second placement slot 201 and the second ventilation channel 12.

[0053] In some other specific embodiments, a sealing ring groove is formed on the surface of the first pressure plate 1 facing the second pressure plate 2. The sealing ring groove is located circumferentially in the placement groove, and a sealing ring 5 protruding from the surface of the first pressure plate 1 is provided in the sealing ring groove. With this arrangement, the opposing surfaces of the first pressure plate 1 and the second pressure plate 2 are flat, which can achieve a sealed engagement of the placement groove, making the sealing solution simple and easy to implement.

[0054] Of course, in addition to the above methods, it is also feasible to have a snap-fit ​​connection between the first pressure plate 1 and the second pressure plate 2 with matching concave and convex structures.

[0055] In some other preferred embodiments, a pipe connector 6 is inserted at the end of the first vent 11.

[0056] In some other preferred embodiments, a pipe fitting 6 is inserted at the end of the second vent 12. Figure 2 and Figure 3 The example shows a second ventilation duct 12 with a tube connector 6 inserted at the end.

[0057] Regarding how the first pressure plate 1 and the second pressure plate 2 form a sealed clamping connection, in some preferred embodiments, the harmonic reducer airtightness testing device further includes a power mechanism 7; the worktable includes a base 8 and a top seat 9, with the top seat 9 located above the base 8, the power mechanism 7 mounted on the top seat 9, and the first pressure plate 1 mounted on the base 8. The power mechanism 7 can drive the second pressure plate 2 to reciprocate along a first direction and can apply pressure to the second pressure plate 2, so that the second pressure plate 2 presses the reducer 100 under test into the placement groove. The first direction is the axial direction of the reducer 100 under test, which can be a vertical direction.

[0058] With this configuration, the power mechanism 7 can not only adjust the position of the second pressure plate 2, but also apply pressure after the second pressure plate 2 contacts the reducer 100 under test and the first pressure plate 1 to squeeze the first sealing gasket 3, the second sealing gasket 4, and the sealing ring 5 to achieve sealing.

[0059] Of course, in addition to the above-mentioned method of controlling the position of the second pressure plate 2 by using an electric mechanism, it is also feasible to replace the power mechanism 7 with other structures that can achieve linear displacement, such as a screw and nut, and to manually rotate the screw to displace it in order to pressurize the second pressure plate 2 and achieve a seal.

[0060] The power mechanism 7 can be a cylinder. Of course, in addition to cylinders, electric cylinders and hydraulic cylinders are also feasible.

[0061] In some other preferred embodiments, the first pressure plate 1 is detachably connected to the base 8, and the first pressure plate 1 has several different sizes; the second pressure plate 2 is detachably connected to the power mechanism 7, and the second pressure plate 2 has several different sizes. Specifically, the first pressure plate 1 and the second pressure plate 2 can be prefabricated as multiple independent pressure plates with different sizes, forming multiple pressure plates of different specifications, which can be directly replaced as needed.

[0062] This setup allows for quick disassembly and replacement with tooling of other sizes, facilitating model changeover. It also makes it easy to replace different types of the first pressure plate 1 and the second pressure plate 2 to adapt to the testing of harmonic reducers of different sizes and models. This enhances the versatility and applicability of the harmonic reducer airtightness testing device for testing various types of harmonic reducers, and saves costs.

[0063] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0064] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0065] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0066] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0067] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0068] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A device for testing the airtightness of a harmonic reducer, characterized in that, Includes a worktable and a pressure plate assembly disposed on the worktable; The pressure plate assembly includes a first pressure plate (1) and a second pressure plate (2). The first pressure plate (1) and / or the second pressure plate (2) are provided with a placement slot that can accommodate the reducer (100) to be tested. The first pressure plate (1) is provided with a first air passage (11) for communicating with an external air pressure regulating device. The first pressure plate (1) or the second pressure plate (2) is provided with a second air passage (12) for communicating with an external air pressure regulating device. The first pressure plate (1) and the second pressure plate (2) can be sealed and fastened together in the first direction, and the first pressure plate (1) can be sealed and contacted with the end face of the flexible wheel (110) of the reducer under test (100), and the second pressure plate (2) can be sealed and contacted with the end face of the rigid wheel (120) of the reducer under test (100), so that the internal cavity sealed by the oil seal (1301) of the reducer under test (100) is isolated from the space in the placement groove, and the internal cavity sealed by the oil seal (1301) of the reducer under test (100) is only connected to the first vent (11), and the space in the placement groove is only connected to the second vent (12).

2. The harmonic reducer airtightness testing device according to claim 1, characterized in that, The first pressure plate (1) is provided with a placement groove, which is a first placement groove (101). A first sealing gasket (3) is provided in the first placement groove (101). The first sealing gasket (3) can seal the inner side of the screw hole on the end face of the flexible wheel (110) of the reducer (100) under test. The second pressure plate (2) is provided with a placement groove, which is a second placement groove (201). The second placement groove (201) is provided with a second sealing gasket (4). The second sealing gasket (4) can at least seal the screw hole on the end face of the wheel (120) of the reducer (100) under test.

3. The harmonic reducer airtightness testing device according to claim 2, characterized in that, The first pressure plate (1) has a first mounting blind hole (102), which is opposite to the first sealing gasket (3) along the first direction, and the first mounting blind hole (102) is used for bolts passing through the first sealing gasket (3) to be fastened; The second pressure plate (2) has a second mounting blind hole (202), which is opposite to the second sealing gasket (4) along the first direction, and the second mounting blind hole (202) is used for bolts passing through the second sealing gasket (4) to be fastened.

4. The harmonic reducer airtightness testing device according to claim 2, characterized in that, The second vent (12) is disposed on the first pressure plate (1) and located radially outside the first sealing gasket (3); The first vent (11) is located radially inside the first sealing gasket (3).

5. The harmonic reducer airtightness testing device according to claim 1, characterized in that, The placement groove provided on the first pressure plate (1) is a first placement groove (101), and the placement groove provided on the second pressure plate (2) is a second placement groove (201); The second ventilation duct (12) is disposed on the first pressure plate (1). The second ventilation duct (12) includes a main duct (1201) and a secondary duct (1202). On a projection plane perpendicular to the first direction, the orthographic projection of the main duct (1201) is located within the orthographic projection of the first placement slot (101), and the orthographic projection of the secondary duct (1202) is located outside the orthographic projection of the first placement slot (101). When the first pressure plate (1) and the second pressure plate (2) are sealed and fastened, the auxiliary channel (1202) and the second placement groove (201) are connected along the first direction.

6. The harmonic reducer airtightness testing device according to claim 5, characterized in that, The opening of the second placement groove (201) is chamfered, and the chamfer covers the secondary channel (1202) in the radial direction of the second placement groove (201).

7. The harmonic reducer airtightness testing device according to claim 1, characterized in that, A sealing ring groove is provided on the surface of the first pressure plate (1) facing the second pressure plate (2). The sealing ring groove is located in the circumference of the placement groove, and a sealing ring (5) protruding from the surface of the first pressure plate (1) is provided in the sealing ring groove.

8. The harmonic reducer airtightness testing device according to claim 1, characterized in that, A pipe fitting (6) is inserted into the end of the first ventilation channel (11) and / or the end of the second ventilation channel (12).

9. The harmonic reducer airtightness testing device according to claim 1, characterized in that, It also includes the power mechanism (7); The workbench includes a base (8) and a top seat (9). The power mechanism (7) is mounted on the top seat (9). The first pressure plate (1) is mounted on the base (8). The power mechanism (7) can drive the second pressure plate (2) to reciprocate along the first direction and can apply pressure to the second pressure plate (2).

10. The harmonic reducer airtightness testing device according to claim 9, characterized in that, The first pressure plate (1) is detachably connected to the base (8), and the first pressure plate (1) has several different sizes; the second pressure plate (2) is detachably connected to the power mechanism (7), and the second pressure plate (2) has several different sizes.

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