Sealing mechanism of helium leak hunting equipment for steering gear driving motor shell

Abstract

The invention discloses a sealing mechanism of helium leak hunting equipment for a steering gear driving motor shell, which comprises a machine table, a lower vacuum box plate, an upper vacuum box plate, a vacuum box body, a workpiece seat, a first plugging assembly, a second plugging assembly and a lifting assembly, and is characterized in that the lower vacuum box plate is arranged on the machine table, and the upper vacuum box plate is arranged on the lifting assembly; the vacuum box body is arranged on the upper vacuum box plate, the lifting assembly is used for controlling the upper vacuum box plate to move up and down, and the upper vacuum box plate, the lower vacuum box plate and the vacuum box body form a sealed cavity; the workpiece seat is arranged on the lower vacuum box plate, the first plugging assembly is arranged on the upper vacuum box plate, and the first plugging assembly and the workpiece seat are used for sealing a first plugging opening and a second plugging opening of a workpiece; and the second plugging assembly seals a third plugging opening of the workpiece. According to the structure of the workpiece, reliable sealing of the plugging opening of the workpiece is achieved.

Description

Technical Field

[0001] This invention relates to the field of testing equipment, and in particular to a sealing mechanism for a helium leak detection device for a drive motor housing. Background Technology

[0002] The steering drive motor housing is a crucial component of an automobile. The motor housing must meet an IP67 or higher protection rating to prevent moisture and dust intrusion that could lead to short circuits or corrosion. Therefore, before leaving the factory, it needs to undergo helium leak testing. Helium gas has a small molecular weight (4 g / mol) and high fluidity, allowing it to penetrate extremely fine gaps. Combined with the specific identification capabilities of a mass spectrometer, the detection accuracy reaches 10⁻¹³ Pa·m³ / s. Therefore, the workpiece must be sealed during connection.

[0003] like Figure 1 As shown, the steering gear drive motor housing has three sealing ports, located at both ends and the side of the steering gear motor housing. Therefore, a reliable sealing mechanism is required to connect the workpiece to the helium leak detection equipment. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the main objective of this invention is to overcome these deficiencies and disclose a sealing mechanism for a helium leak detection device for a steering gear drive motor housing. The mechanism includes a machine base, a lower vacuum chamber plate, an upper vacuum chamber plate, a vacuum chamber body, a workpiece seat, a first sealing assembly, a second sealing assembly, and a lifting assembly. The lower vacuum chamber plate is mounted on the machine base, the upper vacuum chamber plate is mounted on the lifting assembly, and the vacuum chamber body is mounted on the upper vacuum chamber plate. The lifting assembly controls the up-and-down movement of the upper vacuum chamber plate, and the upper vacuum chamber plate, lower vacuum chamber plate, and vacuum chamber body form a sealed cavity.

[0005] The workpiece seat is disposed on the lower vacuum chamber plate, and the first sealing assembly is disposed on the upper vacuum chamber plate. The first sealing assembly and the workpiece seat seal the first and second sealing ports of the workpiece; the second sealing assembly seals the third sealing port of the workpiece.

[0006] Furthermore, the lifting assembly includes an upper mounting plate, guide shafts, and a first cylinder. Four guide shafts are arranged in a square pattern on the machine base. The upper mounting plate is connected to the upper end of the guide shafts. The first cylinder is mounted on the upper mounting plate. The upper vacuum chamber plate is slidably connected to the guide shafts. The first cylinder is connected to the upper vacuum chamber plate, and the upper vacuum chamber plate is moved by the first cylinder.

[0007] Furthermore, the workpiece seat is provided with a positioning groove that mates with the workpiece, a first sealing groove is provided in the positioning groove, and a first sealing ring is provided in the first sealing groove, so as to seal the first sealing opening of the workpiece with the workpiece seat by means of the first sealing ring.

[0008] Furthermore, the first sealing assembly includes a first mounting base, a guide rod, a spring, and a pressure plate. The first mounting base is disposed on the upper vacuum chamber plate and has a guide hole. The guide rod is slidably disposed in the guide hole and has a limiting part at its upper end. The spring is disposed on the guide rod and the lower end of the guide rod is fixed to the pressure plate. The two ends of the spring act on the first mounting base and the pressure plate, and the pressure plate seals the second sealing port.

[0009] Furthermore, a second sealing groove is provided on the pressure plate, the second sealing groove is arranged around the second sealing opening of the workpiece, and a second sealing ring is provided in the second sealing groove.

[0010] Furthermore, four guide rods are provided and arranged in an array.

[0011] Furthermore, the second sealing assembly includes a second mounting base, a first connecting rod, a second cylinder, and a sealing assembly. The second mounting base is fixed to the lower vacuum chamber plate, and a first through hole is provided on the second mounting base. The first connecting rod slides and is sealed to the first through hole. The sealing assembly is disposed on the first connecting rod, and the second cylinder is connected to the first connecting rod. The sealing assembly is moved by the second cylinder, and the sealing assembly seals the third sealing port of the workpiece.

[0012] Furthermore, the sealing assembly includes a fixed seat, a floating seat, and a third sealing ring. The fixed seat is disposed on the first connecting rod and has an axially recessed guide groove. The floating seat is axially slidably connected to the guide groove. The floating seat is provided with a pressing part and a driving part. The third sealing ring is disposed on the floating seat and located between the pressing part and the fixed seat. The driving part controls the axial movement of the floating seat to compress and radially expand the third sealing ring, thereby sealing the third sealing port.

[0013] Furthermore, a positioning inner core protrudes from the workpiece seat, and during sealing, the driving part is supported on the positioning inner core.

[0014] Furthermore, it also includes a filler block, which is installed on the first sealing assembly. During sealing, the filler block is placed in the inner cavity of the workpiece to reduce the cavity voids.

[0015] The beneficial effects achieved by this invention are as follows:

[0016] This invention achieves reliable sealing of the workpiece's sealing opening based on the workpiece's structure. The first sealing assembly employs a floating connection using a pressure plate and a spring. The spring pressure achieves a seal with the workpiece while simultaneously ensuring a seal between the vacuum chamber and the lower vacuum chamber plate. The second sealing assembly, through the gap between the floating seat and the fixed seat, compresses the third sealing ring to achieve radial expansion, thus sealing the sealing opening. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the workpiece's structure;

[0018] Figure 2 This is a schematic diagram of the sealing mechanism of a helium leak detection device for a steering gear drive motor housing according to the present invention, installed on the device.

[0019] Figure 3 This is a three-dimensional structural schematic diagram of the sealing mechanism of a helium leak detection device for a steering gear drive motor housing according to the present invention.

[0020] Figure 4 This is a schematic diagram showing the fit between the workpiece holder, the lower vacuum chamber plate, and the third sealing assembly;

[0021] Figure 5 This is a schematic diagram showing the mating of the second sealing component and the positioning inner core;

[0022] Figure 6 , Figure 7 This is a three-dimensional structural diagram of the first sealing component;

[0023] Figure 8 This is a schematic diagram of the structure of the first sealing component;

[0024] Figure 9 This is a schematic diagram of the assembly of the sealing mechanism and the workpiece of a helium leak detection device for a steering gear drive motor housing according to the present invention.

[0025] The attached figures are labeled as follows:

[0026] 1. Machine base; 2. Lower vacuum chamber plate; 3. Upper vacuum chamber plate; 4. Vacuum chamber body; 5. Workpiece seat; 6. First sealing assembly; 7. Second sealing assembly; 8. Lifting assembly; 9. Filling block; 51. Positioning groove; 52. First sealing ring; 53. Positioning inner core; 61. First mounting seat; 62. Guide rod; 63. Spring; 64. Pressure plate; 65. Second sealing ring; 621. Limiting part; 71. Second mounting seat; 72. First connecting rod; 73. Sealing assembly; 711. Guide sleeve; 712. Fourth sealing ring; 731. Fixed seat; 732. Floating seat; 733. Third sealing ring; 734. Pressing part; 735. Drive part; 7311. Limiting groove; 7321. Limiting pin; 81. Upper mounting plate; 82. Guide shaft; 83. First cylinder. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] A sealing mechanism for a helium leak detection device for a steering gear drive motor housing, such as Figure 2-9 As shown, it includes a machine base 1, a lower vacuum chamber plate 2, an upper vacuum chamber plate 3, a vacuum chamber 4, a workpiece seat 5, a first sealing assembly 6, a second sealing assembly 7, and a lifting assembly 8. The lower vacuum chamber plate 2 is mounted on the machine base 1, the upper vacuum chamber plate 3 is mounted on the lifting assembly 8, and the vacuum chamber 4 is mounted on the upper vacuum chamber plate 3. The upper vacuum chamber plate 3 is moved up and down by the lifting assembly 8, and the upper vacuum chamber plate 3, the lower vacuum chamber plate 2, and the vacuum chamber 4 form a sealed cavity.

[0029] The workpiece seat 5 is mounted on the lower vacuum chamber plate 2, and the first sealing assembly 6 is mounted on the upper vacuum chamber plate 3. The first sealing assembly 6 and the workpiece seat 5 seal the first and second sealing ports of the workpiece; the second sealing assembly 7 seals the third sealing port of the workpiece.

[0030] In use, the workpiece seat 5 is equipped with positioning grooves that mate with the features of the workpiece to ensure the placement orientation of the workpiece and to ensure that the first sealing component 6 and the second sealing component 7 correspond to the second and third sealing ports of the workpiece. The workpiece is placed on the workpiece seat 5, the first sealing port seals with the workpiece seat 5, and the lifting component 8 controls the upper vacuum chamber plate 2 to move downwards, sealing the lower end face of the vacuum chamber 4 with the lower vacuum chamber plate 2, and using the first sealing component 6 to seal the second sealing port of the workpiece. The second sealing component 7 seals the third sealing port of the workpiece. This creates a sealed space between the upper vacuum chamber plate 3, the lower vacuum chamber plate 2, the vacuum chamber 4, and the workpiece; another sealed space is formed inside the workpiece. Specifically, the lower vacuum chamber plate 2 and the workpiece seat 5 are provided with connection holes for connecting to a helium leak detection device. The helium leak detection method is conventional and will not be elaborated upon here.

[0031] In one embodiment, such as Figure 2-9 As shown, the lifting assembly 8 includes an upper mounting plate 81, a guide shaft 82, and a first cylinder 83. Specifically, four guide shafts 82 are provided, and the four guide shafts 82 are distributed in a square and fixed on the machine base 1. The upper mounting plate 81 is fixed to the upper end of the guide shafts 82. The first cylinder 83 is provided on the upper mounting plate 81. The upper vacuum chamber plate 3 is slidably connected to the guide shafts 82. The first cylinder 83 is connected to the upper vacuum chamber plate 3, and the upper vacuum chamber plate 3 is moved by the first cylinder 83.

[0032] In one embodiment, such as Figure 2-9As shown, the workpiece seat 5 is provided with a positioning groove 51 that mates with the workpiece. A first sealing groove is provided in the positioning groove 51, and a first sealing ring 52 is provided in the first sealing groove. The first sealing ring 52 is used to seal the first sealing opening of the workpiece with the workpiece seat 5. The shape of the positioning groove 51 matches the shape of one end of the workpiece so that the workpiece is oriented.

[0033] In one embodiment, such as Figure 2-9 As shown, the first sealing assembly 6 includes a first mounting base 61, a guide rod 62, a spring 63, and a pressure plate 64. The first mounting base 61 is mounted on the upper vacuum chamber plate 3 and has a guide hole. The guide rod 62 is slidably mounted in the guide hole, and a limiting part 621 is provided at the upper end of the guide rod 62. The spring 63 is mounted on the guide rod 62, and the lower end of the guide rod 62 is fixed to the pressure plate 64. The two ends of the spring 63 act on the first mounting base 61 and the pressure plate 64, and the pressure plate 64 seals the second sealing port. Specifically, the upper vacuum chamber plate 3 moves downward so that the lower surface of the vacuum chamber 4 seals with the lower vacuum chamber plate 2, making the first sealing assembly 6 a floating structure to ensure self-adaptive sealing between the first sealing assembly 6 and the workpiece. When the pressure plate 64 contacts the second sealing port of the workpiece, the upper vacuum chamber plate 3 drives the first mounting base 61 to continue moving downwards. The spring 63 is compressed, and the limiting part 621 of the guide rod 62 separates from the first mounting base 61. The pressure of the spring 63 presses the pressure plate 64 tightly onto the workpiece, ensuring the seal of the second sealing port of the workpiece. After the test is completed, the first sealing assembly 6 resets. The process is as follows: the first mounting base 61 moves upwards, and due to the force of the spring 63, the pressure plate 64 remains pressed against the workpiece until the limiting part 621 contacts the first mounting base 61. Then, the pressure plate 64 moves upwards synchronously with the first mounting base 61, separating from the workpiece.

[0034] In the above embodiments, such as Figure 2-9 As shown, a second sealing groove is provided on the pressure plate 64, the second sealing groove is arranged around the second sealing opening of the workpiece, and a second sealing ring 65 is provided inside the second sealing groove.

[0035] In the above embodiments, such as Figure 2-9 As shown, four guide rods 62 are provided and arranged in an array. That is, the four guide rods 62 are arranged in a square to ensure that the pressure plate 64 is subjected to uniform force.

[0036] In one embodiment, such as Figure 2-9As shown, the second sealing assembly 7 includes a second mounting base 71, a first connecting rod 72, a second cylinder (not shown), and a sealing assembly 73. The second mounting base 71 is fixed on the lower vacuum chamber plate 2. A first through hole is provided on the second mounting base 71. The first connecting rod 72 slides and is sealed to the first through hole. The sealing assembly 73 is disposed on the first connecting rod 72. The second cylinder is fixedly mounted on the second mounting base 71 and connected to the first connecting rod 72. The first connecting rod 72 is controlled by the second cylinder to drive the sealing assembly 73 to reciprocate. The sealing assembly 73 seals the third sealing port of the workpiece.

[0037] The first through hole is provided with a guide sleeve 711 and a fourth sealing ring 712. The guide sleeve 711 is slidably connected to the first connecting rod 72, and the fourth sealing ring 712 seals the second mounting seat 71 with the first connecting rod 72.

[0038] In one embodiment, such as Figure 2-9 As shown, the sealing assembly 73 includes a fixed seat 731, a floating seat 732, and a third sealing ring 733. The fixed seat 731 is disposed on the first connecting rod 72 and has an axially recessed guide groove. The floating seat 732 is axially slidably connected to the guide groove. The floating seat 732 is provided with a pressing part 734 and a driving part 735. The third sealing ring 733 is disposed on the floating seat 732 and is located between the pressing part 734 and the fixed seat 731. The driving part 735 controls the axial movement of the floating seat 732 to compress and radially expand the third sealing ring 733, thereby sealing the third sealing port.

[0039] In the above embodiments, such as Figure 2-9 As shown, the workpiece seat 5 has a protruding positioning inner core 53. When sealing, the drive unit 735 is supported on the positioning inner core 53.

[0040] In one embodiment, a limiting groove 7311 is provided on the side wall of the fixed seat 731, and a limiting pin 7321 is provided on the floating seat 732. The limiting pin 7321 is placed in the limiting groove 7311, thereby limiting the range of axial movement between the floating seat 732 and the fixed seat 731.

[0041] In use, the second cylinder controls the first connecting rod 72 to push the sealing assembly 73 into the third sealing port. When the driving part 735 contacts the positioning inner core 53, the floating seat 732 stops moving, and the fixed seat 731 continues to move towards the floating seat 732. The distance between the pressing part 734 and the fixed seat 731 gradually decreases, and the third sealing ring 733 inside is axially compressed and expands radially to press against the inner wall of the third sealing port, thus sealing the third sealing port. When unsealing, the second cylinder drives the first connecting rod 72 in the opposite direction. Initially, the third sealing ring 733 is in a radially expanded state, and the friction between it and the third sealing port is large. The floating seat 732 remains stationary. During this process, the third sealing ring 733 gradually returns to its original position. When the limiting pin 7321 contacts one end of the limiting groove 7311, the fixed seat 731 drives the floating seat 732 away from the third sealing port.

[0042] In one embodiment, such as Figure 2-9 As shown, it also includes a filler block 9, which is installed on the first sealing assembly 6. During sealing, the filler block 9 is placed inside the workpiece cavity to reduce the cavity voids. When in use, this invention... Figure 1-9 As shown, the workpiece is placed on the workpiece seat 5, corresponding to the positioning groove 51, ensuring that the third sealing port corresponds to the second sealing component 7, the second sealing port corresponds to the first sealing component 6, and the first sealing port contacts the first sealing ring 52. The first cylinder 83 controls the upper vacuum chamber plate 3 to move downward, and the pressure plate 64 contacts the second sealing port of the workpiece. The pressure plate 64 and the second sealing port are sealed by the second sealing ring 65. The upper vacuum chamber plate 3 continues to move downward, and the spring 73 is compressed. The pressure of the spring 73 makes the pressure plate 64 stably press against the workpiece. The vacuum chamber 4 contacts the lower vacuum chamber plate 2 and completes the seal. A sealing ring is set between the vacuum chamber 4 and the lower vacuum chamber plate 3 to achieve a seal. The second cylinder drives the first connecting rod 72 to control the sealing component 73 to insert into the third sealing port. The third sealing port is sealed by the radial expansion of the third sealing ring 733. At this time, the workpiece is sealed and connected to the helium leak detection equipment. The workpiece is then tested by the helium leak detection equipment.

[0043] After the test is completed, the first cylinder 83 resets, causing the first sealing assembly 6 and the vacuum chamber 4 to move upwards, and the second sealing assembly 7 resets. At this point, the workpiece can be removed, and the next workpiece can be placed in for the next round of testing.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications or equivalent substitutions made to the present invention without departing from the spirit and scope thereof should be covered within the protection scope of the claims of the present invention.

Claims

1. A sealing mechanism for a helium leak detection device for a steering gear drive motor housing, characterized in that, The system includes a machine base, a lower vacuum chamber plate, an upper vacuum chamber plate, a vacuum chamber body, a workpiece seat, a first sealing assembly, a second sealing assembly, and a lifting assembly. The lower vacuum chamber plate is mounted on the machine base, the upper vacuum chamber plate is mounted on the lifting assembly, and the vacuum chamber body is mounted on the upper vacuum chamber plate. The lifting assembly controls the up and down movement of the upper vacuum chamber plate. The upper vacuum chamber plate, the lower vacuum chamber plate, and the vacuum chamber body form a sealed cavity. The workpiece seat is disposed on the lower vacuum chamber plate, and the first sealing assembly is disposed on the upper vacuum chamber plate. The first sealing assembly and the workpiece seat seal the first and second sealing ports of the workpiece; the second sealing assembly seals the third sealing port of the workpiece.

2. The sealing mechanism of the helium leak detection device for the steering gear drive motor housing according to claim 1, characterized in that, The lifting assembly includes an upper mounting plate, guide shafts, and a first cylinder. Four guide shafts are arranged in a square on the machine base. The upper mounting plate is connected to the upper end of the guide shafts. The first cylinder is mounted on the upper mounting plate. The upper vacuum chamber plate is slidably connected to the guide shafts. The first cylinder is connected to the upper vacuum chamber plate, and the upper vacuum chamber plate is moved by the first cylinder.

3. The sealing mechanism of the helium leak detection device for the steering gear drive motor housing according to claim 1, characterized in that, The workpiece seat is provided with a positioning groove that mates with the workpiece. A first sealing groove is provided in the positioning groove, and a first sealing ring is provided in the first sealing groove. The first sealing ring is used to seal the first sealing opening of the workpiece with the workpiece seat.

4. The sealing mechanism of the helium leak detection device for the steering gear drive motor housing according to claim 1, characterized in that, The first sealing assembly includes a first mounting base, a guide rod, a spring, and a pressure plate. The first mounting base is disposed on the upper vacuum chamber plate and has a guide hole. The guide rod is slidably disposed in the guide hole and has a limiting part at its upper end. The spring is disposed on the guide rod and the lower end of the guide rod is fixed to the pressure plate. The two ends of the spring act on the first mounting base and the pressure plate, and the pressure plate seals the second sealing port.

5. The sealing mechanism of the helium leak detection device for the steering gear drive motor housing according to claim 4, characterized in that, The pressure plate is provided with a second sealing groove, which surrounds the second sealing opening of the workpiece, and a second sealing ring is provided inside the second sealing groove.

6. The sealing mechanism of the helium leak detection device for the steering gear drive motor housing according to claim 4, characterized in that, The guide rods are arranged in four columns in an array.

7. The sealing mechanism of the helium leak detection device for the steering gear drive motor housing according to claim 1, characterized in that, The second sealing assembly includes a second mounting base, a first connecting rod, a second cylinder, and a sealing assembly. The second mounting base is fixed to the lower vacuum chamber plate and has a first through hole. The first connecting rod slides and is sealed to the first through hole. The sealing assembly is mounted on the first connecting rod. The second cylinder is connected to the first connecting rod. The second cylinder drives the sealing assembly to move, and the sealing assembly seals the third sealing port of the workpiece.

8. The sealing mechanism of the helium leak detection device for the steering gear drive motor housing according to claim 7, characterized in that, The sealing assembly includes a fixed seat, a floating seat, and a third sealing ring. The fixed seat is disposed on the first connecting rod and has an axially recessed guide groove. The floating seat is axially slidably connected to the guide groove. The floating seat is provided with a pressing part and a driving part. The third sealing ring is disposed on the floating seat and located between the pressing part and the fixed seat. The driving part controls the axial movement of the floating seat to compress and radially expand the third sealing ring, thereby sealing the third sealing port.

9. The sealing mechanism of a helium leak detection device for a steering gear drive motor housing according to claim 8, characterized in that, The workpiece seat has a protruding positioning inner core, and during sealing, the driving part is supported on the positioning inner core.

10. The sealing mechanism of a helium leak detection device for a steering gear drive motor housing according to claim 1, characterized in that, It also includes a filler block, which is installed on the first sealing assembly. When sealing, the filler block is placed in the inner cavity of the workpiece to reduce the inner cavity void.

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