Air tightness detection device for gear chamber products

Abstract

An airtightness detection device for a gear chamber product, comprising a bottom plate, a sealing mechanism arranged on the upper part of the bottom plate for pressing the product to be tested, and an air charging pipeline arranged on the bottom plate. The sealing mechanism includes a bottom sealing gasket arranged between the bottom plate and the product to be tested for sealing the edge of the lower end face of the product to be tested, a pressure rod for pressing the product to be tested onto the bottom plate, a pressure rod driving device for driving the pressure rod to lift and lower, a top sealing plate for sealing the hollow part of the upper end face of the product to be tested, a top sealing gasket arranged between the top sealing plate and the upper end face of the product to be tested, a plurality of floating clamping components arranged on the top sealing plate for sealing the through holes at the suspended bosses, a top plate assembly for pressing the top sealing plate onto the upper end face of the product to be tested, and a top plate driving device for driving the top plate assembly to move up and down. By setting the floating clamping components in the present invention, during airtightness detection, the deformation of the sealing surface of the suspended boss is smaller while the sealing is completed, effectively ensuring the flatness of the sealing surface and guaranteeing the product quality.

Description

Technical Field

[0001] The present invention relates to an airtightness detection device for a gear chamber product. Background Art

[0002] Existing gear chamber products have structural characteristics such as a relatively low overall thickness, a large area of upper and lower sealing end faces, and a relatively large number of intermediate suspension bosses. Due to the large sealing end faces, a relatively large force is required to seal the sealing surface during the airtightness detection of gear chamber products. There are many through holes with relatively thin bosses (hereinafter referred to as suspended bosses) on the product sealing surface. Since there is a height difference between the lower end face of the suspended boss and the large bottom sealing surface, as Figure 4 shown, the existing airtightness detection devices generally use pressing rods and sealing gaskets to press at the through holes of the suspended bosses. Applying such a large force easily causes local deformation of such surfaces, resulting in problems with the flatness or parallelism of the sealing surface and causing product quality problems. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiency that the sealing structure of a conventional airtightness detection device easily causes deformation of the sealing surface near the suspended boss during use, and to provide an airtightness detection device for a gear chamber product that can effectively ensure product quality without causing deformation of the sealing surface near the suspended boss.

[0004] The technical solution of the present invention is as follows: An airtightness detection device for a gear chamber product includes a bottom plate, a sealing mechanism arranged on the upper part of the bottom plate for pressing the product to be detected, an air charging pipeline arranged on the bottom plate for charging air into the inner cavity of the product to be detected, and an air charging device connected to the air charging pipeline.

[0005] The sealing mechanism includes a bottom sealing gasket arranged between the bottom plate and the product to be detected for sealing the edge of the lower end face of the product to be detected, a pressing rod for pressing the product to be detected onto the bottom plate, a pressing rod driving device for driving the pressing rod to lift and lower, a top sealing plate for sealing the hollow part of the upper end face of the product to be detected, a top sealing gasket arranged between the top sealing plate and the upper end face of the product to be detected, a plurality of floating clamping components arranged on the top sealing plate for sealing the through holes at the suspended bosses, a top plate assembly for pressing the top sealing plate onto the upper end face of the product to be detected, and a top plate driving device for driving the top plate assembly to move up and down; an assembly hole corresponding to the through hole at the suspended boss on the product to be detected is arranged on the top sealing plate.

[0006] The floating clamping assembly includes a floating slider disposed on the bottom plate corresponding to the through hole at the suspended boss of the product to be measured, and a locking pull stud that cooperates with the floating slider to seal the through hole at the suspended boss; a stepped hole is provided in the middle of the floating slider; an internal thread that cooperates with the threaded section of the locking pull stud is provided in the large-stage of the stepped hole; a sealing ring for sealing the through hole to be sealed is sleeved on the locking pull stud; the lower end of the locking pull stud passes through the assembly hole on the top sealing plate and the through hole at the suspended boss and is screwed into the large-stage of the floating slider to press the sealing ring against the top sealing plate.

[0007] The floating slider is movably connected to the bottom plate through a slide bar; a large head portion that cooperates with the stepped portion of the floating slider to limit and prevent the floating slider from disengaging from the slide bar is provided at the upper end of the slide bar.

[0008] It further includes more than one circular sealing plate for sealing through holes that are not in the same plane as the upper end surface of the product to be measured; a circular sealing ring is provided between the circular sealing plate and the product to be measured; the circular sealing plate is connected to a sealing plate driving device for driving the circular sealing plate to move up and down through a connecting rod.

[0009] The top plate assembly includes a top plate and a top rod for connecting the top plate and the top plate driving device; a plurality of top plate reinforcing ribs are provided between the top plate and the top rod; the top plate driving device is a cylinder or an oil cylinder.

[0010] The pressure rod driving device and the sealing plate driving device are cylinders or oil cylinders.

[0011] The support plate for fixing the pressure rod driving device, the top plate driving device, and the sealing plate driving device is connected to the bottom plate through a column.

[0012] A spring is sleeved on the slide bar between the floating slider and the bottom plate; the lower end of the spring abuts against the bottom plate, and the upper end abuts against the lower end of the floating slider.

[0013] A positioning hole is provided on the floating slider; a rotation prevention pin that cooperates with the positioning hole is correspondingly provided on the bottom plate to prevent the floating slider from rotating so as to facilitate the locking pull stud to be screwed into the floating slider.

[0014] The rotation prevention pin and the positioning hole are in clearance fit.

[0015] The outer diameter of the rotation prevention pin is equal to the inner diameter of the positioning hole.

[0016] The slide bar is a screw.

[0017] Compared with the prior art, the advantages of the present invention are as follows: By providing a floating slider and a locking rivet, the present invention changes the pressure that commonly presses a suspended boss towards a blank area in the prior art into a clamping force of the suspended boss towards a tooling attached to the boss surface. In this way, while the suspended boss is sealed, the deformation of the sealing surface is smaller, effectively ensuring less plastic deformation (irreversible deformation) of the flatness / parallelism of the sealing surface and guaranteeing the product quality. Since the suspended boss of the product to be measured has been sealed and locked by the floating slider and the locking rivet, the entire pressure rod driving device and the sealing plate driving device can be arranged more reasonably, making the pressure exerted on the sealing material on the sealing surface more uniform, so that the pressure can be converted into sealing performance more efficiently. And this change also enables the required pressure to be further reduced when obtaining the same sealing performance, so that the actual pressure is closer to the calculation result in the design stage, and the calculation result is more instructive, facilitating the diagnosis and improvement of situations such as deformation of the product to be measured caused by unreasonable pressure setting. And this arrangement change of the pressure rod driving device and the sealing plate driving device also makes it easier to arrange the detection device, reducing the design and manufacturing difficulty of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 is a schematic structural diagram of the present invention.

[0020] Figure 2 is the second schematic structural diagram of the present invention.

[0021] Figure 3 is Figure 2 the A-A cross-sectional view of

[0022] Figure 4 is a schematic diagram of the prior art.

[0023] Figure 5 is the schematic structural diagram of the floating clamping assembly (unclamped state).

[0024] Figure 6 is the schematic structural diagram of the floating clamping assembly (clamped state).

[0025] In the figure, 0 is the product to be tested, 1 is the bottom plate, 2 is the floating slider, 201 is the stepped hole, 202 is the positioning hole, 3 is the slide bar, 4 is the spring, 5 is the anti-rotation pin, 6 is the locking rivet, 7 is the sealing ring, 8 is the gas charging pipeline, 9 is the bottom gasket, 10 is the top sealing plate, 11 is the top plate driving device, 12 is the top plate, 13 is the ejector rod, 14 is the top plate reinforcing rib, 15 is the pressure rod, 16 is the pressure rod driving device, 17 is the support plate, 18 is the column, 19 is the circular sealing plate, 20 is the connecting rod, 21 is the sealing plate driving device, and 22 is the top gasket. Detailed implementation manner

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] For technologies, methods, and devices known to those of ordinary skill in the relevant field, they may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification.

[0028] Figure 1 , Figure 2 , Figure 3 In [relevant content], the airtightness detection device for the gear chamber product provided by the present invention includes a bottom plate 1, a sealing mechanism disposed on the upper part of the bottom plate 1 for pressing the product to be tested, and a gas charging pipeline 8 disposed on the bottom plate 1 for inflating the inner cavity of the product to be tested.

[0029] The sealing mechanism includes a bottom sealing gasket 9 disposed between the bottom plate 1 and the product under test for sealing the edge of the lower end face of the product under test, a pressure rod 15 for pressing the product under test against the bottom plate 1, a top sealing plate 10 for sealing the hollowed-out portion of the upper end face of the product under test, a top sealing gasket 22 disposed between the top sealing plate 10 and the upper end face of the product under test, five floating clamping assemblies disposed on the top sealing plate 10 for sealing the through holes at the suspended bosses, a top plate assembly for pressing the top sealing plate 10 against the upper end face of the product under test, and a top plate driving device 11 for driving the top plate assembly to move up and down; the top plate assembly includes a top plate 12 and a top rod 13 for connecting the top plate and the top plate driving device 11; four top plate reinforcing ribs 14 are provided between the top plate 12 and the top rod 13. It also includes two circular sealing plates 19 for sealing the through holes not in the same plane as the upper end face of the product under test; a circular sealing ring adapted to the orifice of the through hole to be sealed is provided between the circular sealing plate and the product under test; the circular sealing plate 19 is connected to a sealing plate driving device 21 for driving the circular sealing plate to move up and down through a connecting rod 20. The top sealing plate 10 is provided with assembly holes corresponding to the through holes at the suspended bosses of the product under test.

[0030] The support plate 17 is connected to the bottom plate 1 through a column 18. A pressure rod driving device 16 for driving the pressure rod 15 to move up and down, a top plate driving device 11 for driving the top plate assembly to move up and down, and a sealing plate driving device 21 for driving the circular sealing plate to move up and down are fixed to the support plate 17. The top plate driving device 11, the pressure rod driving device 16, and the sealing plate driving device 21 are all cylinders.

[0031] Figure 5 , Figure 6 In, the floating clamping assembly in the present invention is used for sealing the through holes at the suspended bosses during the airtightness detection of gear chamber products. A floating slider 2 is provided at the position corresponding to the inner cavity of the product under test on the bottom plate 1, and the floating slider 2 is correspondingly arranged with the through holes at the suspended bosses of the product under test. A locking pull stud 6 for cooperating with the floating slider 2 to seal the through holes at the suspended bosses. A stepped hole 201 is provided in the middle of the floating slider 2, and an internal thread for cooperating with the threaded section of the locking pull stud 6 is provided at the large platform stage of the stepped hole 201. A sealing ring 7 for sealing the through holes at the suspended bosses is sleeved on the locking pull stud 6. The lower end of the locking pull stud 6 passes through the assembly hole on the top sealing plate 10 and the through hole at the suspended boss and is screwed into the large platform stage of the floating slider 2 to press the sealing ring 7 against the through hole of the suspended boss to achieve sealing.

[0032] A slide bar 3 is provided on a bottom plate 1 and is matched with a floating slider 2. The floating slider 2 is movably connected to the slide bar 3 and can move up and down along the slide bar 3. A large head portion is provided at the upper end of the slide bar 3 and is matched with a step portion of the floating slider 2 for limiting to prevent the floating slider 2 from disengaging from the slide bar 3. A spring 4 is sleeved on the slide bar 3 between the floating slider 2 and the bottom plate 1. The lower end of the spring 4 abuts against the bottom plate 1, and the upper end abuts against the lower end of the floating slider 2. The spring 4 pushes the floating slider 2 upward to a through hole of a suspended boss so as to facilitate screwing a locking rivet 6 into the floating slider. A positioning hole 202 is provided on the floating slider 2, and an anti-rotation pin 5 is correspondingly provided on the bottom plate 1 and is matched with the positioning hole to prevent the floating slider 2 from rotating so as to facilitate screwing the locking rivet 6 into the floating slider 2. The anti-rotation pin 5 and the positioning hole 202 are in clearance fit. The slide bar 3 can be an internal hexagonal screw, and the outer diameter of the head of the internal hexagonal screw is smaller than the inner diameter of the large stage of the stepped hole of the floating slider 2 and larger than the inner diameter of the small stage of the stepped hole of the floating slider 2. The floating slider 2 and the spring 4 are sleeved outside the slide bar 3. After aligning the positioning hole on the floating slider 2 with the anti-rotation pin 5 on the bottom plate 1, the lower end of the slide bar 3 is screwed into a threaded hole on the bottom plate 1 to be connected and fixed to the bottom plate 1.

[0033] When the present invention is used for airtightness detection, first place a product 0 to be tested on the bottom plate 1. The floating slider 2 is located inside the cavity of the product 0 to be tested, and the floating slider 2 abuts against the lower end face of the suspended boss under the action of the spring 4. Place a top sealing gasket and a top sealing plate on the upper end face of the product to be tested (as Figure 1 shown), and then pass the lower end of the locking rivet 6 through an assembly hole on the top sealing plate 10 and a through hole at the suspended boss and screw it into the floating slider 2 until it is tightened. The large head portion of the locking screw 6 presses the sealing ring 7 against the upper end face of the through hole of the suspended boss, thereby realizing the sealing at the through hole of the suspended boss. Then, a pressing rod driving device 16 drives a pressing rod 15 to press the product to be tested, a top plate driving device 11 drives a top plate 12 to press the top sealing plate 10, and a sealing plate driving device 21 drives a circular sealing plate 19 to move downward to press and seal a through hole that is not in the same plane as the upper end face of the product to be tested (as Figure 2 shown). Then, connect an air charging pipeline 8 to an air charging device to start the detection.

[0034] The above are only exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An airtightness detection device for a gear chamber product, comprising a bottom plate (1), a sealing mechanism arranged on the upper part of the bottom plate (1) for pressing the product to be tested, an air charging pipeline (8) arranged on the bottom plate (1) for charging air into the inner cavity of the product to be tested, and an air charging device connected to the air charging pipeline (8); characterized in that: The sealing mechanism includes a bottom sealing gasket (9) arranged between the bottom plate (1) and the product to be tested for sealing the edge of the lower end face of the product to be tested, a pressure rod (15) for pressing the product to be tested onto the bottom plate, a pressure rod driving device (16) for driving the pressure rod (15) to lift and lower, a top sealing plate (10) for sealing the hollow part of the upper end face of the product to be tested, a top sealing gasket (22) arranged between the top sealing plate (10) and the upper end face of the product to be tested, a plurality of floating clamping components arranged on the top sealing plate (10) for sealing the through holes at the suspended bosses, a top plate assembly for pressing the top sealing plate (10) onto the upper end face of the product to be tested, and a top plate driving device (11) for driving the top plate assembly to move up and down; an assembly hole corresponding to the through hole at the suspended boss of the product to be tested is provided on the top sealing plate (10); The floating clamping component includes a floating slider (2) arranged on the bottom plate (1) corresponding to the through hole at the suspended boss of the product to be tested, and a locking pull stud (6) cooperating with the floating slider (2) to seal the through hole at the suspended boss; a stepped hole (201) is provided in the middle of the floating slider (2); an internal thread for cooperating with the threaded section of the locking pull stud (6) is provided at the large step stage of the stepped hole (201); a sealing ring (7) for sealing the through hole at the suspended boss is sleeved on the locking pull stud (6); the lower end of the locking pull stud (6) passes through the assembly hole on the top sealing plate (10) and the through hole at the suspended boss and is screwed into the large step stage of the floating slider (2) to press the sealing ring (7) onto the top sealing plate (10); The floating slider (2) is movably connected to the bottom plate (1) through a slide bar (3); a large head for cooperating with the step part of the floating slider (2) for limiting to prevent the floating slider (2) from disengaging from the slide bar (3) is provided at the upper end of the slide bar (3).

2. The airtightness detection device for gear chamber products according to claim 1, wherein: It further includes one or more circular sealing plates (19) for sealing through holes not in the same plane as the upper end face of the product to be tested; a circular sealing ring is provided between the circular sealing plate and the product to be tested; the circular sealing plate (19) is connected to a sealing plate driving device (21) for driving the circular sealing plate to move up and down through a connecting rod (20).

3. The airtightness detection device for the gear chamber product according to claim 1, characterized in that: The top plate assembly includes a top plate (12) and a top rod (13) for connecting the top plate and the top plate driving device (11); a plurality of top plate reinforcing ribs (14) are provided between the top plate (12) and the top rod (13); the top plate driving device (11) is a cylinder or an oil cylinder.

4. The airtightness detection device for gear chamber products according to claim 2, characterized in that: The pressure rod driving device (16) and the sealing plate driving device (21) are cylinders or oil cylinders.

5. The airtightness detection device for gear chamber products according to claim 4, characterized in that: A support plate (17) for fixing the pressure rod driving device (16), the top plate driving device (11), and the sealing plate driving device (21) is connected to the bottom plate (1) through a column (18).

6. The airtightness detection device for gear chamber products according to claim 1, characterized in that: A spring (4) is sleeved on a slide bar (3) between the floating slider (2) and the bottom plate (1); the lower end of the spring (4) abuts against the bottom plate (1), and the upper end abuts against the lower end of the floating slider (2).

7. The airtightness detection device for gear chamber products according to claim 1, characterized in that: A positioning hole (202) is provided on the floating slider (2); a rotation prevention pin (5) which is provided correspondingly on the bottom plate (1) and cooperates with the positioning hole to prevent the floating slider (2) from rotating so as to facilitate the locking rivet (6) to be screwed into the floating slider (2) is provided on the bottom plate (1).

8. The airtightness detection device for gear chamber products according to claim 7, characterized in that: The rotation prevention pin (5) and the positioning hole (202) are in clearance fit.

9. The airtightness detection device for gear chamber products according to claim 8, characterized in that: The outer diameter of the rotation prevention pin (5) is equal to the inner diameter of the positioning hole (202).

10. The airtightness detection device for gear chamber products according to claim 1, wherein: The slide bar (3) is a screw.

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