A precision helium testing device for liquid bearings

Abstract

This application provides a precision helium detection device for liquid bearings, relating to the field of liquid bearing airtightness testing technology. The device includes a mounting bracket with a sealing base plate, a sealing cap, a clamping mechanism, and a vacuum assembly. The sealing cap is located directly above the sealing base plate. The upper and lower ends of the liquid bearing are clamped and sealed by the sealing cap and the sealing base plate, respectively. The clamping mechanism is connected to the sealing cap. The vacuum assembly includes a vacuum connector connected to the sealing cap and communicating with the interior of the liquid bearing. The vacuum connector is connected to a vacuum pump via a pipe. Helium gas is introduced around the evacuated liquid bearing. A helium mass spectrometer leak detector is externally connected to the pipe to detect the presence of helium inside the pipe. This application offers advantages such as accurate positioning, improved reliability of seal detection, and increased detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of liquid bearing airtightness testing technology, and in particular to a precision helium testing device for liquid bearings. Background Technology

[0002] Liquid bearings are widely used in precision machinery, aerospace and other fields due to their advantages such as low friction and high stability. Their airtightness is a key indicator affecting their performance. If leakage occurs, it will lead to the loss of internal media or the intrusion of external impurities, which will seriously affect the operating accuracy and lifespan of the equipment.

[0003] Currently, the airtightness testing of liquid bearings mostly uses simple sealing devices, which have problems such as unreliable sealing, inaccurate positioning, and low testing efficiency, making it difficult to meet the high-precision testing requirements of mass production.

[0004] Therefore, a specialized testing fixture needs to be designed to enable rapid and accurate airtightness testing of liquid bearings. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a precision helium gas detection device for liquid bearings.

[0006] A precision helium detection device for liquid bearings includes a mounting bracket, on which a sealing base plate, a sealing cap, a clamping mechanism, and a vacuum assembly are mounted. The sealing cap is located directly above the mounting base plate. The upper and lower ends of the liquid bearing are clamped and sealed by the sealing cap and the sealing base plate, respectively. The clamping mechanism is connected to the sealing cap. The vacuum assembly includes a vacuum connector connected to the sealing cap and communicating with the interior of the liquid bearing. The vacuum connector is connected to a vacuum pump via a pipe. Helium gas is introduced around the evacuated liquid bearing. A helium mass spectrometer leak detector is connected externally to the pipe to detect the presence of helium gas inside the pipe.

[0007] Furthermore, a positioning groove is provided on the sealing base plate, and a sealing support ring is provided below the sealing cover. Both the positioning groove and the sealing support ring are provided with sealing rings that play a sealing role.

[0008] Furthermore, the clamping mechanism includes a horizontal plate fixed on the mounting bracket, and a first push-pull quick clamp is provided on the horizontal plate. The movable rod end of the first push-pull quick clamp is connected to the sealing cover. When the handle of the first push-pull quick clamp is rotated, the movable rod drives the sealing cover to slide and press against the end face of the liquid bearing.

[0009] Furthermore, the movable rod end of the first push-pull quick clamp is provided with a drive groove, and a drive screw is rotatably connected to the sealing cover. The drive screw passes through the drive groove and is threadedly connected to the drive groove. A drive nut is threadedly connected to the drive screw, which abuts against the sealing cover and the movable rod end of the first push-pull quick clamp respectively.

[0010] Furthermore, the mounting bracket is provided with a lateral positioning mechanism for laterally positioning the liquid bearing. The lateral positioning mechanism includes three sets, one of which is located on the central axis of the line connecting the other two sets of lateral positioning mechanisms, and the liquid bearing is located between the three sets of lateral positioning mechanisms.

[0011] Furthermore, the lateral positioning mechanism includes a positioning plate fixed on the mounting bracket and arranged vertically, a second push-pull quick clamp is mounted on the positioning plate, and the movable rod end of the second push-pull quick clamp is connected to an abutment plate that abuts against the side wall of the liquid bearing.

[0012] Furthermore, a sliding rod is slidably provided at the end of the movable rod of the second push-pull quick clamp, the abutment plate is fixed on the sliding rod, and a positioning spring is sleeved on the sliding rod. The two ends of the positioning spring are respectively fixed on the movable rod and the sliding rod of the second push-pull quick clamp and are in an extended state.

[0013] In summary, this application includes at least one of the following beneficial technical effects: the liquid bearing is installed on the sealing base plate, the liquid bearing is radially positioned by the lateral positioning mechanism, the sealing cover is used to seal the two ends of the liquid bearing by acting on the first push-pull quick clamp, the liquid bearing is vacuumed by the vacuum pump, helium is introduced around the liquid bearing, and the presence of helium in the pipeline is detected to determine whether the liquid bearing is leaking. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0015] Figure 2 This is a schematic diagram of the clamping mechanism in an embodiment of this application.

[0016] Figure 3 This is a schematic diagram of the lateral positioning mechanism according to an embodiment of this application.

[0017] Explanation of reference numerals in the attached drawings: 1. Mounting bracket; 2. Sealing base plate; 3. Sealing gland; 4. Air extraction connector; 5. Support ring; 6. Sealing ring; 7. Positioning groove; 8. Horizontal plate; 9. First push-pull quick clamp; 10. Drive screw; 11. Drive nut; 12. Positioning plate; 13. Second push-pull quick clamp; 14. Positioning spring; 15. Abutment plate. Detailed Implementation

[0018] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0019] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0020] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0021] A precision helium testing device for liquid bearings includes a mounting bracket 1, on which a sealing base plate 2, a sealing cap 3, a clamping mechanism, and a vacuum assembly are mounted. The sealing cap 3 is located directly above the mounting sealing base plate 2. The upper and lower ends of the liquid bearing are clamped and sealed by the sealing cap 3 and the sealing base plate 2, respectively. The clamping mechanism is connected to the sealing cap 3. By acting on the sealing cap 3 through the clamping mechanism, the sealing cap 3 squeezes the liquid bearing from top to bottom and cooperates with the sealing base plate 2 below to achieve the sealing and fixing of the hydraulic bearing.

[0022] Reference Figure 1 and Figure 2 The vacuum assembly includes a vacuum connector 4 connected to the sealing cover 3. The vacuum connector 4 is connected to the inside of the liquid bearing. The vacuum connector 4 is connected to a vacuum pump through a pipe. A helium mass spectrometer leak detector for detecting helium is connected to the pipe.

[0023] After the liquid bearing is evacuated, helium gas is introduced around it. A helium mass spectrometer leak detector is used to detect whether helium gas is present in the pipeline to determine whether the liquid bearing is leaking. If helium gas is present in the pipeline, it proves that the liquid bearing may be leaking.

[0024] Reference Figure 1 and Figure 2 The sealing base plate 2 has a positioning groove 7 that matches the bottom of the liquid bearing. A sealing support ring 5 is provided below the sealing cover 3. Both the positioning groove 7 and the sealing support ring 5 are provided with sealing rings 6 that play a sealing role. The sealing rings 6 and the sealing support ring 5 work together with the sealing cover 3 as auxiliary fixtures. On the one hand, they ensure that there is enough space at the position of the air extraction connector 4 so that the vacuum pump can evacuate the inside of the liquid bearing. On the other hand, they work with the sealing rings 6 to play a sealing connection role.

[0025] Reference Figure 1 and Figure 2 The clamping mechanism includes a horizontal plate 8 fixed on the mounting bracket 1. The horizontal plate 8 is horizontally arranged and a first push-pull quick clamp 9 is provided on the horizontal plate 8. The end of the movable rod of the first push-pull quick clamp 9 is coaxially provided with a drive groove. A drive screw 10 is rotatably connected to the sealing cover 3. The drive screw 10 passes through the drive groove and is threadedly connected to the drive groove. Two drive nuts 11 are threadedly connected to the drive screw 10. The two drive nuts 11 abut against the sealing cover 3 and the end of the movable rod of the first push-pull quick clamp 9, respectively. The two drive nuts 11 limit the distance between the sealing cover 3 and the movable rod of the first push-pull quick clamp 9, and also have a certain locking effect to prevent the two from moving closer together and affecting the seal. When the handle of the first push-pull quick clamp 9 is rotated, the movable rod drives the sealing cover 3 to slide and abut against the end face of the liquid bearing.

[0026] Reference Figure 2 and Figure 3 The mounting bracket 1 is equipped with a lateral positioning mechanism for laterally positioning the liquid bearing. The lateral positioning mechanism comprises three sets, one of which is located on the central axis of the line connecting the other two sets. The liquid bearing is positioned between the three sets of lateral positioning mechanisms. The lateral positioning mechanism includes a positioning plate 12 fixed to the mounting bracket 1. The positioning plate 12 is vertically arranged, and a second push-pull quick clamp 13 is mounted on the positioning plate 12. The movable rod end of the second push-pull quick clamp 13 is connected to an abutment plate 15 that abuts against the side wall of the liquid bearing.

[0027] The side of the liquid bearing is positioned by a lateral positioning mechanism to prevent the liquid bearing from moving radially and to ensure the accuracy of positioning.

[0028] Reference Figure 1 and Figure 3The second push-pull quick clamp 13 has a sliding rod at the end of its movable rod. The abutment plate 15 is fixed on the sliding rod. A positioning spring 14 is sleeved on the sliding rod. The two ends of the positioning spring 14 are fixed on the movable rod and the sliding rod of the second push-pull quick clamp 13, respectively. When the abutment plate 15 abuts against the side wall of the liquid bearing, the positioning spring 14 converts the rigid contact into an elastic contact, which plays a certain buffering role. A rubber ring that increases friction is fixed on the abutment plate 15.

[0029] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or variations made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A liquid bearing helium precision detection device, characterized in that: The system includes a mounting bracket (1), on which a sealing base plate (2), a sealing cap (3), a clamping mechanism, and a vacuum assembly are provided. The sealing cap (3) is located directly above the mounting sealing base plate (2). The upper and lower ends of the liquid bearing are clamped and sealed by the sealing cap (3) and the sealing base plate (2), respectively. The clamping mechanism is connected to the sealing cap (3). The vacuum assembly includes a vacuum connector (4) connected to the sealing cap (3) and communicating with the inside of the liquid bearing. The vacuum connector (4) is connected to a vacuum pump through a pipe. Helium gas is introduced around the liquid bearing after vacuuming. A helium mass spectrometer leak detector is connected to the pipe to detect whether there is helium gas inside the pipe.

2. The liquid bearing helium precision detection device according to claim 1, wherein, The sealing base plate (2) is provided with a positioning groove (7), and a sealing support ring (5) is provided below the sealing cover (3). Both the positioning groove (7) and the sealing support ring (5) are provided with sealing rings (6) that play a sealing role.

3. The liquid bearing helium precision detection device according to claim 2, wherein, The clamping mechanism includes a horizontal plate (8) fixed on the mounting bracket (1). A first push-pull quick clamp (9) is provided on the horizontal plate (8). The movable rod end of the first push-pull quick clamp (9) is connected to the sealing cover (3). When the handle of the first push-pull quick clamp (9) is rotated, the movable rod drives the sealing cover (3) to slide and press against the end face of the liquid bearing.

4. The liquid bearing helium precision detection device according to claim 3, characterized in that, The first push-pull quick clamp (9) has a drive groove at the end of the movable rod. The sealing cover (3) is rotatably connected to a drive screw (10). The drive screw (10) passes through the drive groove and is threadedly connected to the drive groove. The drive screw (10) is threadedly connected to a drive nut (11) that abuts against the end of the movable rod of the sealing cover (3) and the first push-pull quick clamp (9).

5. The liquid bearing helium precision detection device of claim 1, wherein, The mounting bracket (1) is provided with a lateral positioning mechanism for lateral positioning of the liquid bearing. The lateral positioning mechanism includes three sets, one of which is located on the central axis of the line connecting the other two sets of lateral positioning mechanisms, and the liquid bearing is located between the three sets of lateral positioning mechanisms.

6. The liquid bearing helium precision detection device according to claim 5, wherein, The lateral positioning mechanism includes a positioning plate (12) fixed on the mounting bracket (1) and arranged vertically. A second push-pull quick clamp (13) is installed on the positioning plate (12). The movable rod end of the second push-pull quick clamp (13) is connected to an abutment plate (15) that abuts against the side wall of the liquid bearing.

7. The liquid bearing helium precision detection device according to claim 6, characterized in that, The second push-pull quick clamp (13) has a sliding rod slidably provided at the end of the movable rod. The abutment plate (15) is fixed on the sliding rod. A positioning spring (14) is sleeved on the sliding rod. The two ends of the positioning spring (14) are respectively fixed on the movable rod and the sliding rod of the second push-pull quick clamp (13) and are in an extended state.

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