Clamp assembly for leak detection of multi-cavity casting

Abstract

The utility model discloses a clamp assembly for leak detection of a multi-cavity casting, which relates to the technical field of casting detection and comprises a first sealing gasket and a second sealing gasket. The first connecting piece is arranged in the blow-by area of the multi-cavity casting in a penetrating mode, and the first connecting piece is used for driving the first sealing gasket and the second sealing gasket to be close to each other, so that the first sealing gasket seals the left end of the blow-by area of the multi-cavity casting, and the second sealing gasket seals the right end of the blow-by area of the multi-cavity casting; the air inlet sealing element is used for being connected with the hole wall of a through hole, communicated with the blow-by area, in the multi-cavity casting, the air inlet sealing element is provided with a vent hole, and the air inlet sealing element is used for being connected with the output end of a pressurizing device so that the output end of the pressurizing device can be communicated with the blow-by area of the multi-cavity casting through the vent hole. The clamp assembly can seal the blow-by area of the multi-cavity casting, so that detection personnel can accurately judge whether the blow-by area of the multi-cavity casting leaks or not.

Description

Technical Field

[0001] The utility model relates to the technical field of casting leak detection, in particular to a clamp assembly used for leak detection of multi-cavity castings. Background Art

[0002] Castings refer to metal parts or products manufactured through a casting process, and are usually used to manufacture automotive parts and mechanical equipment. Multi-cavity castings refer to castings with two or more cavities or chambers in the casting. The gas-passing area refers to the channel in the casting used to connect the two casting chambers. The gas-passing area is usually opened on the bottom wall of the two casting chambers so that the two casting chambers are connected through the gas-passing area. The gas-passing area is a very important design in multi-cavity castings. The gas-passing area allows the medium (such as liquid, gas or powder, etc.) between the two chambers to be transferred, which is very critical for some systems or equipment that require liquid or gas transmission, such as hydraulic systems, pneumatic systems, fluid pipelines, etc. Porosity and cracks are common defects in multi-cavity castings. These defects will cause the multi-cavity castings to leak during subsequent use. Therefore, it is very necessary to perform leak detection on the multi-cavity castings after the casting is completed.

[0003] In the prior art, inspectors use a fixture to seal the openings of the chambers and multiple through holes on a multi-cavity casting, and then immerse the multi-cavity casting and the fixture in water. A pressurizing device passes high-pressure gas into the multi-cavity casting, and inspectors observe whether bubbles appear in the water to determine whether the multi-cavity casting has a leakage defect. This detection method is a holistic test method, and inspectors can only determine whether the entire multi-cavity casting has a leak, but cannot accurately determine whether the gas-bearing area on the multi-cavity casting has a leak. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a fixture assembly for leak detection of multi-cavity castings, which can accurately determine whether there is a leak in the gas-conducting area on the multi-cavity castings.

[0005] The fixture assembly for leak detection of multi-cavity castings according to an embodiment of the utility model comprises:

[0006] a first sealing gasket, the first sealing gasket being used to press against the bottom wall of the left chamber of the multi-cavity casting;

[0007] a second sealing gasket, the second sealing gasket being used to press against the bottom wall of the right chamber of the multi-cavity casting;

[0008] a first connecting member, the first connecting member being inserted into the gas-flowing region of the multi-cavity casting, the first connecting member being used to drive the first sealing gasket and the second sealing gasket to approach each other, so that the first sealing gasket seals the left end of the gas-flowing region of the multi-cavity casting, and the second sealing gasket seals the right end of the gas-flowing region of the multi-cavity casting;

[0009] An air intake seal, the air intake seal is used to be connected to the hole wall of the through hole on the multi-cavity casting that is connected to the air flow area, and the air intake seal is provided with an air vent, and the air intake seal is used to be connected to the output end of the pressurizing device so that the output end of the pressurizing device is connected to the air flow area of ​​the multi-cavity casting through the air vent.

[0010] At least the following beneficial effects:

[0011] When the inspector needs to conduct precise leakage detection on the gas-separation area of ​​the multi-cavity casting, the inspector can place the first sealing gasket into the left chamber of the multi-cavity casting, and press the first sealing gasket against the bottom wall of the left chamber of the multi-cavity casting, and then place the second sealing gasket into the right chamber of the multi-cavity casting, and press the second sealing gasket against the bottom wall of the right chamber of the multi-cavity casting. Then the inspector can place the first connecting piece into the gas-separation area of ​​the multi-cavity casting, and driven by the first connecting piece, the first sealing gasket and the second sealing gasket are close to each other, so that the first sealing gasket seals the left end of the gas-separation area of ​​the multi-cavity casting, and the second sealing gasket seals the right end of the gas-separation area of ​​the multi-cavity casting. After the left and right ends of the gas-separation area are sealed, the inspector connects the air intake seal to the hole wall of the through hole on the multi-cavity casting that is connected to the gas-separation area, and then connects the output end of the pressurizing device to the air intake seal. Finally, the inspector immerses the entire multi-cavity casting in water and starts the pressurizing device, which can generate high-pressure gas and send the high-pressure gas into the gas-sucking area of ​​the multi-cavity casting through the vent hole of the air inlet seal. When the inspector observes bubbles coming out of the water, it means that there is a leak in the gas-sucking area of ​​the multi-cavity casting; when the inspector does not observe bubbles coming out of the water, it means that there is no leak in the gas-sucking area of ​​the multi-cavity casting. The fixture assembly can seal the gas-sucking area of ​​the multi-cavity casting, allowing the inspector to perform accurate leak detection on the gas-sucking area of ​​the multi-cavity casting, and then allowing the inspector to accurately determine whether there is a leak in the gas-sucking area on the multi-cavity casting.

[0012] According to the embodiment of the utility model, the fixture assembly for leak detection of multi-cavity castings also includes a first pressure block, a first threaded hole is formed on the first pressure block, a first avoidance hole is formed on the first sealing gasket, and a second avoidance hole is formed on the second sealing gasket. The first connecting member is a first bolt, and the first bolt is passed through the first avoidance hole and the second avoidance hole. The first bolt is threadedly connected to the inner wall of the first threaded hole so that the first pressure block is pressed against the bottom wall of the left chamber of the multi-cavity casting through the first sealing gasket, and the nut of the first bolt is pressed against the bottom wall of the right chamber of the multi-cavity casting through the second sealing gasket.

[0013] According to the embodiment of the utility model, the fixture assembly for leak detection of multi-cavity castings also includes a sleeve, which is sleeved on the first bolt and is used to abut against the nut of the first bolt so that the nut of the first bolt is pressed against the second sealing gasket through the sleeve.

[0014] According to the fixture assembly for leak detection of multi-cavity castings in the embodiment of the utility model, the air intake seal is a sealing screw, and the air intake seal is used for threaded connection with the hole wall of the through hole on the multi-cavity casting that is connected to the air string area.

[0015] According to the clamp assembly for leak detection of multi-cavity castings according to the embodiment of the utility model, it also includes a third sealing gasket, and the sealing screw is pressed against the multi-cavity casting through the third sealing gasket.

[0016] According to the embodiment of the utility model, the fixture assembly for leak detection of multi-cavity castings also includes a fourth sealing gasket, a fifth sealing gasket, a second connecting piece and a sealing block, the fourth sealing gasket is used to press against the left end of the multi-cavity casting, the fifth sealing gasket is used to press against the right end of the multi-cavity casting, the second connecting piece is penetrated into the left chamber, the air string area and the right chamber of the multi-cavity casting, the second connecting piece is used to drive the fourth sealing gasket and the fifth sealing gasket to approach each other, so that the fourth sealing gasket seals the opening of the left chamber of the multi-cavity casting, and the fifth sealing gasket seals the opening of the right chamber of the multi-cavity casting, and the sealing block is used to be connected to the multi-cavity casting so that the sealing block can seal the through hole on the multi-cavity casting that is connected to the right chamber.

[0017] According to the embodiment of the utility model, the fixture assembly for leak detection of multi-cavity castings also includes a second pressure block, a second threaded hole is formed on the second pressure block, a fourth avoidance hole is formed on the fourth sealing gasket, and a fifth avoidance hole is formed on the fifth sealing gasket. The second connecting member is a second bolt, and the second bolt is passed through the fourth avoidance hole and the fifth avoidance hole. The second bolt is threadedly connected to the inner wall of the second threaded hole so that the second pressure block is pressed against the left end of the multi-cavity casting through the fourth sealing gasket, and the nut of the second bolt is pressed against the right end of the multi-cavity casting through the fifth sealing gasket.

[0018] According to the embodiment of the utility model, the fixture assembly for leak detection of multi-cavity castings also includes a third pressure block, which is provided with a mounting hole for the second bolt to pass through, and the third pressure block is used to abut against the nut of the second bolt so that the nut of the second bolt is pressed against the fifth sealing gasket through the third pressure block.

[0019] According to the clamp assembly for leak detection of multi-cavity castings according to the embodiment of the utility model, it also includes a sixth sealing gasket, and the sealing block is pressed against the multi-cavity casting through the sixth sealing gasket.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of a multi-cavity casting according to an embodiment of the utility model;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of a multi-cavity casting according to an embodiment of the utility model;

[0024] Figure 3 It is a schematic cross-sectional structure diagram of the clamp assembly for leak detection of multi-cavity castings according to an embodiment of the utility model for sealing the gas leakage area of ​​the multi-cavity castings;

[0025] Figure 4 It is a schematic cross-sectional structure diagram of the clamp assembly for leak detection of a multi-cavity casting according to an embodiment of the utility model, which seals the left chamber and the right chamber of the multi-cavity casting;

[0026] Reference numerals:

[0027] First connecting member 100; first sealing gasket 110; second sealing gasket 120; first pressing block 130; sleeve 140; air inlet sealing member 150; vent hole 151; third sealing gasket 160;

[0028] The second connecting member 200 ; the fourth sealing gasket 210 ; the fifth sealing gasket 220 ; the sixth sealing gasket 230 ; the second pressing block 240 ; the third pressing block 250 ; and the sealing block 260 . DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] refer to Figures 1 to 3 According to an embodiment of the utility model, the fixture assembly for leak detection of multi-cavity castings includes:

[0034] A first sealing gasket 110, the first sealing gasket 110 is used to press against the bottom wall of the left chamber of the multi-cavity casting;

[0035] A second sealing gasket 120, the second sealing gasket 120 is used to press against the bottom wall of the right chamber of the multi-cavity casting;

[0036] A first connecting member 100, which is disposed in the gas-flowing region of the multi-cavity casting. The first connecting member 100 is used to drive the first sealing gasket 110 and the second sealing gasket 120 to approach each other, so that the first sealing gasket 110 seals the left end of the gas-flowing region of the multi-cavity casting, and the second sealing gasket 120 seals the right end of the gas-flowing region of the multi-cavity casting;

[0037] The air intake seal 150 is used to be connected to the hole wall of the through hole connected to the air flow area on the multi-cavity casting. The air intake seal 150 is provided with an air vent 151. The air intake seal 150 is used to be connected to the output end of the pressurizing device so that the output end of the pressurizing device is connected to the air flow area of ​​the multi-cavity casting through the air vent 151.

[0038] It is understandable that when the inspector needs to perform accurate leakage detection on the gas-flowing area of ​​the multi-cavity casting, the inspector can put the first sealing gasket 110 into the left chamber of the multi-cavity casting, and make the first sealing gasket 110 press against the bottom wall of the left chamber of the multi-cavity casting, and then put the second sealing gasket 120 into the right chamber of the multi-cavity casting, and make the second sealing gasket 120 press against the bottom wall of the right chamber of the multi-cavity casting. Then the inspector can put the first connecting member 100 into the gas-flowing area of ​​the multi-cavity casting, and driven by the first connecting member 100, the first sealing gasket 110 and the second sealing gasket 120 are close to each other, so that the first sealing gasket 110 seals the left end of the gas-flowing area of ​​the multi-cavity casting, and the second sealing gasket 120 seals the right end of the gas-flowing area of ​​the multi-cavity casting. After the left and right ends of the gas-flowing area are sealed, the inspector connects the air intake seal 150 to the hole wall of the through hole on the multi-cavity casting that is connected to the gas-flowing area, and then connects the output end of the pressurizing device to the air intake seal 150. Finally, the inspector immerses the entire multi-cavity casting in water and starts the pressurizing device, which can generate high-pressure gas and send the high-pressure gas into the gas-sucking area of ​​the multi-cavity casting through the vent 151 of the air inlet seal 150. When the inspector observes bubbles coming out of the water, it means that there is a leak in the gas-sucking area of ​​the multi-cavity casting; when the inspector does not observe bubbles coming out of the water, it means that there is no leak in the gas-sucking area of ​​the multi-cavity casting. The fixture assembly can seal the gas-sucking area of ​​the multi-cavity casting, allowing the inspector to perform accurate leak detection on the gas-sucking area of ​​the multi-cavity casting, and then allowing the inspector to accurately determine whether there is a leak in the gas-sucking area on the multi-cavity casting.

[0039] refer to Figure 2For the sake of convenience of understanding, a in the figure is the left chamber of the multi-cavity casting in the embodiment of the utility model, b in the figure is the right chamber of the multi-cavity casting in the embodiment of the utility model, c in the figure is the gas stringing area of ​​the multi-cavity casting in the embodiment of the utility model, d in the figure is the through hole on the multi-cavity casting in the embodiment of the utility model connected to the gas stringing area, and e in the figure is the through hole on the multi-cavity casting in the embodiment of the utility model connected to the left chamber.

[0040] It needs to be explained that, in the present invention, the pressurizing device can be an air pump, which can generate gas and send the gas into the gas-bundling area of ​​the multi-cavity casting through the air inlet seal 150, so that the air pressure in the gas-bundling area and the through holes connected to the gas-bundling area increases, thereby completing the leakage detection of the gas-bundling area of ​​the multi-cavity casting.

[0041] refer to Figure 3 The fixture assembly for leak detection of multi-cavity castings also includes a first pressing block 130, a first threaded hole is formed on the first pressing block 130, a first avoidance hole is formed on the first sealing gasket 110, and a second avoidance hole is formed on the second sealing gasket 120. The first connecting member 100 is a first bolt, which is inserted into the first avoidance hole and the second avoidance hole, and the first bolt is threadedly connected to the inner wall of the first threaded hole, so that the first pressing block 130 is pressed against the bottom wall of the left chamber of the multi-cavity casting through the first sealing gasket 110, and the nut of the first bolt is pressed against the bottom wall of the right chamber of the multi-cavity casting through the second sealing gasket 120. It can be understood that the first bolt is inserted into the gas-streaming area of ​​the multi-cavity casting, the first pressing block 130 is arranged in the left chamber of the multi-cavity casting, and the nut of the first bolt is arranged in the right chamber of the multi-cavity casting. The first bolt is threadedly connected to the inner wall of the first threaded hole, and by tightening the first bolt, the nut of the first bolt and the first pressure block 130 approach each other, and driven by the nut of the first bolt and the first pressure block 130, the first sealing gasket 110 and the second sealing gasket 120 approach each other, so that the first pressure block 130 is pressed against the bottom wall of the left chamber of the multi-cavity casting through the first sealing gasket 110, and the nut of the first bolt is pressed against the bottom wall of the right chamber of the multi-cavity casting through the second sealing gasket 120, so that the first sealing gasket 110 closes the left end of the gas string area of ​​the multi-cavity casting, and the second sealing gasket 120 closes the right end of the gas string area of ​​the multi-cavity casting.

[0042] refer to Figure 3The fixture assembly for leak detection of multi-cavity castings also includes a sleeve 140, which is sleeved on the first bolt and is used to abut against the nut of the first bolt, so that the nut of the first bolt can be pressed against the second gasket 120 through the sleeve 140. It can be understood that during the tightening of the first bolt, the nut of the first bolt can be pressed against the sleeve 140, and driven by the nut of the first bolt, the sleeve 140 is pressed against the second gasket 120, so that the second gasket 120 can seal the right end of the gas stringing area of ​​the multi-cavity casting. The nut of the first bolt is pressed against the second gasket 120 through the sleeve 140, so that the force on the second gasket 120 is more uniform.

[0043] refer to Figure 3 , the air intake seal 150 is a sealing screw, and the air intake seal 150 is used to be threadedly connected to the hole wall of the through hole on the multi-cavity casting that is connected to the gas string area. The fixture assembly for leak detection of the multi-cavity casting also includes a third sealing gasket 160, and the sealing screw is pressed against the multi-cavity casting through the third sealing gasket 160. It can be understood that the sealing screw is threadedly connected to the hole wall of the through hole on the multi-cavity casting that is connected to the gas string area, and the sealing screw is pressed against the multi-cavity casting through the third sealing gasket 160, so that the gap between the sealing screw and the hole wall of the through hole is sealed to prevent gas leakage from the sealing thread.

[0044] refer to Figure 4 The fixture assembly for leak detection of multi-cavity castings also includes a fourth sealing gasket 210, a fifth sealing gasket 220, a second connecting piece 200 and a sealing block 260. The fourth sealing gasket 210 is used to press against the left end of the multi-cavity casting, and the fifth sealing gasket 220 is used to press against the right end of the multi-cavity casting. The second connecting piece 200 is penetrated in the left chamber, the gas string area and the right chamber of the multi-cavity casting. The second connecting piece 200 is used to drive the fourth sealing gasket 210 and the fifth sealing gasket 220 to approach each other so that the fourth sealing gasket 210 seals the opening of the left chamber of the multi-cavity casting, and the fifth sealing gasket 220 seals the opening of the right chamber of the multi-cavity casting. The sealing block 260 is used to be connected to the multi-cavity casting so that the sealing block 260 can seal the through hole on the multi-cavity casting that is connected to the left chamber. As an embodiment of the present invention, the fixture assembly for leak detection of a multi-cavity casting further includes a sixth sealing gasket 230 , and the sealing block 260 is pressed against the multi-cavity casting through the sixth sealing gasket 230 .

[0045] It is understandable that after the inspection of the gas-flowing area of ​​the multi-cavity casting is completed, the inspector can remove the first gasket 110, the second gasket 120, the first pressure block 130, the sleeve 140 and the first connecting member 100 from the multi-cavity casting, and then abut the fourth gasket 210 on the left end of the multi-cavity casting, abut the fifth gasket 220 on the right end of the multi-cavity casting, and put the second connecting member 200 into the left chamber, the gas-flowing area and the right chamber of the multi-cavity casting. Driven by the second connecting member 200, the fourth gasket 210 and the fifth gasket 220 are close to each other, so that the fourth gasket 210 is pressed on the left end of the multi-cavity casting and closes the left chamber of the multi-cavity casting, and the fifth gasket 220 is pressed on the right end of the multi-cavity casting and closes the right chamber of the multi-cavity casting. Then, the sealing block 260 is connected to the through-hole area of ​​the multi-cavity casting corresponding to the through-hole area connected to the left chamber, so that the sealing block 260 seals the through-hole on the multi-cavity casting connected to the left chamber. Finally, the inspector immerses the entire multi-cavity casting in water and starts the pressurizing device, which can generate high-pressure gas and send the high-pressure gas into the multi-cavity casting through the vent 151 of the air inlet seal 150. When the inspector observes bubbles coming out of the water, it means that the multi-cavity casting has a leak; when the inspector does not observe bubbles coming out of the water, it means that the multi-cavity casting does not have a leak. The fixture assembly can also seal the left chamber, right chamber and through-hole of the multi-cavity casting, so that the inspector can perform leak detection on the multi-cavity casting as a whole.

[0046] refer to Figure 4The fixture assembly for leak detection of multi-cavity castings also includes a second pressure block 240, a second threaded hole is opened on the second pressure block 240, a fourth avoidance hole is opened on the fourth sealing gasket 210, and a fifth avoidance hole is opened on the fifth sealing gasket 220. The second connecting member 200 is a second bolt, and the second bolt is penetrated into the fourth avoidance hole and the fifth avoidance hole. The second bolt is threadedly connected to the inner wall of the second threaded hole, so that the second pressure block 240 is pressed against the left end of the multi-cavity casting through the fourth sealing gasket 210, and the nut of the second bolt is pressed against the right end of the multi-cavity casting through the fifth sealing gasket 220. It can be understood that the second bolt is inserted into the left chamber, the right chamber and the air-threading area of ​​the multi-cavity casting, the second bolt is inserted into the fourth avoidance hole and the fifth avoidance hole, the second pressure block 240 abuts against the left end of the multi-cavity casting, and the second bolt is threadedly connected to the inner wall of the second threaded hole on the second pressure block 240. By tightening the second bolt, the nut of the second bolt and the second pressure block 240 approach each other. Driven by the nut of the second bolt and the second pressure block 240, the fifth sealing gasket 220 and the fourth sealing gasket 210 approach each other, so that the second pressure block 240 is pressed against the left end of the multi-cavity casting through the fourth sealing gasket 210, and the nut of the second bolt is pressed against the right end of the multi-cavity casting through the fifth sealing gasket 220, so that the fourth sealing gasket 210 seals the opening of the left chamber of the multi-cavity casting, and the fifth sealing gasket 220 seals the opening of the right chamber of the multi-cavity casting.

[0047] refer to Figure 4 The fixture assembly for leak detection of multi-cavity castings also includes a third pressing block 250, which is provided with a mounting hole for the second bolt to pass through, and the third pressing block 250 is used to abut against the nut of the second bolt, so that the nut of the second bolt can be pressed against the fifth sealing gasket 220 through the third pressing block 250. It can be understood that during the tightening process of the second bolt, the nut of the second bolt can be pressed against the third pressing block 250, and driven by the nut of the second bolt, the third pressing block 250 is pressed against the fifth sealing gasket 220, so that the fifth sealing gasket 220 can seal the opening of the right chamber of the multi-cavity casting.

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A fixture assembly for leak detection of multi-cavity castings, characterized in that: include: a first sealing gasket, the first sealing gasket being used to press against the bottom wall of the left chamber of the multi-cavity casting; a second sealing gasket, the second sealing gasket being used to press against the bottom wall of the right chamber of the multi-cavity casting; a first connecting member, the first connecting member being inserted into the gas-flowing region of the multi-cavity casting, the first connecting member being used to drive the first sealing gasket and the second sealing gasket to approach each other, so that the first sealing gasket seals the left end of the gas-flowing region of the multi-cavity casting, and the second sealing gasket seals the right end of the gas-flowing region of the multi-cavity casting; An air intake seal, the air intake seal is used to be connected to the hole wall of the through hole on the multi-cavity casting that is connected to the air flow area, and the air intake seal is provided with an air vent, and the air intake seal is used to be connected to the output end of the pressurizing device so that the output end of the pressurizing device is connected to the air flow area of ​​the multi-cavity casting through the air vent.

2. The fixture assembly for leak detection of multi-cavity castings according to claim 1, characterized in that: It also includes a first pressing block, which is provided with a first threaded hole, the first sealing gasket is provided with a first avoidance hole, and the second sealing gasket is provided with a second avoidance hole. The first connecting member is a first bolt, which is passed through the first avoidance hole and the second avoidance hole, and the first bolt is threadedly connected to the inner wall of the first threaded hole, so that the first pressing block is pressed against the bottom wall of the left chamber of the multi-cavity casting through the first sealing gasket, and the nut of the first bolt is pressed against the bottom wall of the right chamber of the multi-cavity casting through the second sealing gasket.

3. The fixture assembly for leak detection of multi-cavity castings according to claim 2, characterized in that: It also includes a sleeve, which is sleeved on the first bolt and is used to abut against the nut of the first bolt so that the nut of the first bolt is pressed against the second sealing gasket through the sleeve.

4. The fixture assembly for leak detection of multi-cavity castings according to claim 1, characterized in that: The air intake seal is a sealing screw, and the air intake seal is used to be threadedly connected to the hole wall of the through hole on the multi-cavity casting that is connected to the air flow area.

5. The fixture assembly for leak detection of multi-cavity castings according to claim 4, characterized in that: It also includes a third sealing gasket, and the sealing screw is pressed against the multi-cavity casting through the third sealing gasket.

6. The fixture assembly for leak detection of multi-cavity castings according to claim 1, characterized in that: It also includes a fourth sealing gasket, a fifth sealing gasket, a second connecting piece and a sealing block, the fourth sealing gasket is used to press against the left end of the multi-cavity casting, the fifth sealing gasket is used to press against the right end of the multi-cavity casting, the second connecting piece is penetrated into the left chamber, the air string area and the right chamber of the multi-cavity casting, the second connecting piece is used to drive the fourth sealing gasket and the fifth sealing gasket to approach each other, so that the fourth sealing gasket seals the opening of the left chamber of the multi-cavity casting, and the fifth sealing gasket seals the opening of the right chamber of the multi-cavity casting, and the sealing block is used to be connected to the multi-cavity casting, so that the sealing block can seal the through hole on the multi-cavity casting that is connected to the left chamber.

7. The fixture assembly for leak detection of multi-cavity castings according to claim 6, characterized in that: The invention also includes a second pressing block, which is provided with a second threaded hole, the fourth sealing gasket is provided with a fourth avoidance hole, and the fifth sealing gasket is provided with a fifth avoidance hole. The second connecting member is a second bolt, which is passed through the fourth avoidance hole and the fifth avoidance hole. The second bolt is threadedly connected to the inner wall of the second threaded hole, so that the second pressing block is pressed against the left end of the multi-cavity casting through the fourth sealing gasket, and the nut of the second bolt is pressed against the right end of the multi-cavity casting through the fifth sealing gasket.

8. The fixture assembly for leak detection of multi-cavity castings according to claim 7, characterized in that: It also includes a third pressing block, which has a mounting hole for the second bolt to pass through, and the third pressing block is used to abut against the nut of the second bolt so that the nut of the second bolt is pressed against the fifth sealing gasket through the third pressing block.

9. The fixture assembly for leak detection of multi-cavity castings according to claim 6, characterized in that: It also includes a sixth sealing gasket, through which the sealing block is pressed against the multi-cavity casting.

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