Blocking device for air tightness detection of thin-wall inner unthreaded hole

Abstract

The utility model relates to a thin-wall inner unthreaded hole air tightness detection blocking device which comprises a plug, a pneumatic telescopic rod, a first annular air bag and a second annular air bag, the plug is cylindrical, the outer diameter of the plug is 0.5-1 mm smaller than the inner diameter of a thin-wall inner unthreaded hole to be sealed, the front end of the plug extends to the inner side of the thin-wall inner unthreaded hole to be sealed, two annular grooves are formed in the outer side of the front end of the plug, and the first annular air bag and the second annular air bag are arranged in the annular grooves. The diameter of each annular groove is parallel to the axis of the plug, a first annular air bag and a second annular air bag are arranged on the inner sides of the two annular grooves respectively and are both annular, an air cavity is formed in the plug, and an air channel used for communicating the first annular air bag, the second annular air bag and the air cavity is formed in the plug. According to the air tightness detection device, the first annular air bag and the second annular air bag are arranged, so that the air tightness detection device can be tightly attached to the inner wall of an unthreaded hole, air leakage is effectively prevented, and the accuracy of air tightness detection is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to a thin-wall inner light hole air tightness detection and blocking device. Background Art

[0002] In the batch production process or production line, the air tightness of the workpiece needs to be measured to ensure the quality of the workpiece. The air tightness test is mainly to check whether there is leakage in the inner hole of the workpiece. For workpieces that do not allow trace leakage, an air tightness test must be carried out. When conducting an air tightness test, the inner hole needs to be sealed first, and then the change in the air pressure in the hole needs to be tested.

[0003] There are many thin-walled parts on die-castings, and some of these thin-walled parts are also provided with light holes (called thin-wall internal light holes). Usually, end face sealing is used to seal such thin-wall internal light holes to avoid deformation of the thin wall and affect the accuracy of the product. End face sealing will make it difficult to detect surface abnormalities inside the light hole, which will cause the finished product to be scrapped after assembly, resulting in a high scrap rate. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a device for detecting air tightness and blocking of light holes in thin walls in view of the above shortcomings.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A device for detecting and blocking airtightness of thin-walled inner light hole, comprising a plug, a pneumatic telescopic rod, a first annular airbag and a second annular airbag, wherein the plug is cylindrical and has an outer diameter 0.5-1 mm smaller than the inner diameter of the thin-walled inner light hole to be sealed, the front end of the plug extends to the inner side of the thin-walled inner light hole to be sealed, two annular grooves are arranged on the outer side of the front end of the plug, the diameter of the annular grooves is parallel to the axis of the plug, the first annular airbag and the second annular airbag are respectively arranged on the inner sides of the two annular grooves, the first annular airbag and the second annular airbag are both annular, and the plug is provided inside There is an air cavity, and an air passage for connecting the first annular airbag, the second annular airbag and the air cavity is opened inside the plug. A piston is arranged in the air cavity, and a pneumatic telescopic rod is arranged at the rear end of the plug. The telescopic end of the pneumatic telescopic rod is fixedly connected to the rear side of the piston. The pneumatic telescopic rod is used to push the piston to move horizontally in the air cavity. When the piston moves toward the air passage, the air inside the air cavity is pushed through the air passage into the first annular airbag and the second annular airbag. The first annular airbag and the second annular airbag are inflated to seal the gap between the plug and the light hole in the thin wall to be sealed.

[0007] Furthermore, the cross section of the first annular airbag is circular, the cross section of the second annular airbag is elliptical, and the volume of the first annular airbag is smaller than the volume of the second annular airbag.

[0008] Furthermore, the length of the air passage connecting the first annular airbag and the air chamber is shorter than that of the air passage connecting the second annular airbag and the air chamber.

[0009] After the present utility model adopts the above technical solutions, compared with the prior art, it has the following advantages:

[0010] By designing the combined structure of the plug, pneumatic telescopic rod, first annular airbag and second annular airbag, the present utility model realizes high-precision sealing of the internal smooth hole of the thin wall. The first annular airbag and the second annular airbag can closely fit the inner wall of the light hole, effectively preventing gas leakage and improving the accuracy of airtightness detection; by pushing the piston through the pneumatic telescopic rod, the inflation and contraction of the airbag are controlled, realizing automatic operation, simplifying the detection process and improving the detection efficiency; the plugging method of airbag inflation is adopted to avoid the pressure deformation of the thin wall that may be caused by traditional end face plugging, protecting the integrity of the workpiece and also helping to improve the reliability of the detection result; the volume of the first annular airbag is smaller than that of the second annular airbag, and the air passage is first connected to the first annular airbag. The first annular airbag can quickly collide and closely fit the inner wall of the internal smooth hole of the thin wall, and then the second annular airbag closely fits the inner wall of the internal smooth hole of the thin wall. The elliptical wall of the second annular airbag can fit the inner wall of the light hole in a large area. Quick sealing is achieved through the first annular airbag, and stable sealing is achieved in cooperation with the second annular airbag.

[0011] The present utility model will be described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0012] Figure 1 It is a cross-sectional view of the internal structure of the present utility model.

[0013] In the drawings, the list of components represented by each reference numeral is as follows:

[0014] 1. Plug; 2. Pneumatic telescopic rod; 3. First annular airbag; 4. Second annular airbag; 5. Air chamber; 6. Air passage; 7. Piston; 8. Ring groove. Specific Embodiments

[0015] The principles and features of the present utility model will be described below with reference to the drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0016] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0017] As Figure 1 shown, a leak tightness detection plugging device for a thin-walled inner light hole includes a plug 1, a pneumatic telescopic rod 2, a first annular airbag 3, and a second annular airbag 4. The plug 1 is cylindrical and its outer diameter is 0.5 - 1 mm smaller than the inner diameter of the thin-walled inner light hole to be sealed. The front end of the plug 1 extends to the inside of the thin-walled inner light hole to be sealed. Two annular grooves 8 are provided on the outer side of the front end of the plug 1. The diameter of the annular grooves 8 is parallel to the axis of the plug 1. The first annular airbag 3 and the second annular airbag 4 are respectively arranged inside the two annular grooves 8. Both the first annular airbag 3 and the second annular airbag 4 are annular. An air cavity 5 is provided inside the plug 1. An air passage 6 for communicating the first annular airbag 3, the second annular airbag 4, and the air cavity 5 is provided inside the plug 1. A piston 7 is arranged inside the air cavity 5. A pneumatic telescopic rod 2 is arranged at the rear end of the plug 1. The telescopic end of the pneumatic telescopic rod 2 is fixedly connected to the rear side of the piston 7. The pneumatic telescopic rod 2 is used to push the piston 7 to move horizontally inside the air cavity 5. When the piston 7 moves towards the air passage 6, it pushes the air inside the air cavity 5 to enter the first annular airbag 3 and the second annular airbag 4 through the air passage 6. The first annular airbag 3 and the second annular airbag 4 are inflated to seal the gap between the plug 1 and the thin-walled inner light hole to be sealed.

[0018] As an implementation manner, the cross-section of the first annular airbag 3 is circular, the cross-section of the second annular airbag 4 is elliptical, and the volume of the first annular airbag 3 is smaller than the volume of the second annular airbag 4.

[0019] As an implementation manner, the length of the air passage 6 connecting the first annular airbag 3 and the air cavity 5 is shorter than the length of the air passage 6 connecting the second annular airbag 4 and the air cavity 5.

[0020] In the present utility model, the pneumatic telescopic rod 2 is installed on an external detection device, and the overall forward and backward movement of the present utility model is controlled by the external detection device;

[0021] The diameter of the plug is slightly smaller than the diameter of the thin-walled inner light hole to be plugged.

[0022] The working process of the present utility model: Start the pneumatic telescopic rod 2, and its telescopic end pushes the piston 7 to move in the air chamber 5. The movement of the piston 7 presses the air in the air chamber 5 into the first annular airbag 3 and the second annular airbag 4 through the air passage 6. As the air in the airbag increases, the first annular airbag 3 and the second annular airbag 4 gradually expand, and at the same time, they are squeezed by the inner wall of the annular groove 8. First, the first annular airbag 3 quickly fits the inner wall of the light hole, and then the second annular airbag 4 tightly fits the inner wall of the light hole. The elliptical wall of the second annular airbag 4 can fit the inner wall of the light hole over a large area to form an effective seal.

[0023] The above is an example of the best implementation mode of the present utility model, and the parts not described in detail are the common general knowledge of those skilled in the art. The protection scope of the present utility model shall be subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present utility model is also within the protection scope of the present utility model.

Claims

1. A device for detecting the air tightness of a thin-walled inner light hole, characterized in that: The invention comprises a plug (1), a pneumatic telescopic rod (2), a first annular airbag (3) and a second annular airbag (4); the plug (1) is cylindrical and has an outer diameter 0.5-1 mm smaller than the inner diameter of the thin-walled inner light hole to be sealed; the front end of the plug (1) extends to the inner side of the thin-walled inner light hole to be sealed; two annular grooves (8) are arranged on the outer side of the front end of the plug (1); the diameter of the annular grooves (8) is parallel to the axis of the plug (1); the first annular airbag (3) and the second annular airbag (4) are respectively arranged on the inner sides of the two annular grooves (8); the first annular airbag (3) and the second annular airbag (4) are both annular; an air cavity (5) is arranged inside the plug (1); and a gas chamber (6) is arranged inside the plug (1) for An air passage (6) is connected between the first annular airbag (3), the second annular airbag (4) and the air cavity (5); a piston (7) is arranged in the air cavity (5); a pneumatic telescopic rod (2) is arranged at the rear end of the plug (1); the telescopic end of the pneumatic telescopic rod (2) is fixedly connected to the rear side of the piston (7); the pneumatic telescopic rod (2) is used to push the piston (7) to move horizontally in the air cavity (5); when the piston (7) moves toward the air passage (6), the air inside the air cavity (5) is pushed through the air passage (6) to enter the first annular airbag (3) and the second annular airbag (4); the first annular airbag (3) and the second annular airbag (4) are inflated to seal the gap between the plug (1) and the light hole in the thin wall to be sealed.

2. A thin-walled inner light hole air tightness detection and blockage device according to claim 1, characterized in that: The cross section of the first annular airbag (3) is circular, the cross section of the second annular airbag (4) is elliptical, and the volume of the first annular airbag (3) is smaller than the volume of the second annular airbag (4).

3. A thin-walled inner light hole air tightness detection and blockage device according to claim 1, characterized in that: The length of the airway (6) connecting the first annular airbag (3) and the air cavity (5) is shorter than the length of the airway (6) connecting the second annular airbag (4) and the air cavity (5).

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