Tool device for detecting air tightness of casting

Abstract

The utility model relates to a tool device for detecting the air tightness of a casting, which is characterized in that a casting positioning plate is provided with a sealing ring matched with a port at the lower side of the casting and is provided with a detection air inlet channel with an outlet positioned at the inner side of the sealing ring, and a casting pressing mechanism is arranged at the front side of the casting positioning plate; sealing mechanisms used for blocking the remaining end openings of the casting are arranged on the two sides and the rear side of the casting positioning plate, and a hydraulic station provides power sources for the casting pressing mechanism and the sealing mechanisms. According to the device, clamping and sealing of the casting are realized through hydraulic pressure, and the sealing performance can be ensured during air tightness detection.

Description

Technical Field

[0001] This utility model relates to a tooling device for testing the airtightness of castings. Background Technology

[0002] Castings are metal parts manufactured using casting processes and are widely used in the automotive, aerospace, and piping systems industries. Defects such as porosity, shrinkage cavities, cracks, or cold shuts within castings can lead to gas or liquid leaks. For example, leaks in automotive engine blocks, hydraulic valve bodies, or pipe joints can directly affect equipment operating efficiency and even cause malfunctions. Therefore, airtightness testing of castings is an indispensable and critical step in the casting process.

[0003] Existing fixtures for testing the airtightness of castings typically use an air source to drive a cylinder to seal the casting ports. However, because airtightness testing requires specific leakage pressure, fixtures using air pressure to control the sealing of casting ports often fail to provide sufficient clamping force. Therefore, a new fixture device for testing the airtightness of castings is needed. Utility Model Content

[0004] The purpose of this invention is to provide a tooling device for testing the air tightness of castings. This device uses hydraulic pressure to clamp and seal the castings, which helps with subsequent air tightness testing.

[0005] The technical solution of this utility model is as follows: a tooling device for testing the air tightness of castings, including a casting positioning plate, a sealing ring that matches the lower port of the casting and a detection air inlet channel with the outlet located inside the sealing ring, a casting clamping mechanism located on the front side of the casting positioning plate, and sealing mechanisms for sealing the remaining ports of the casting located on both sides and the rear side of the casting positioning plate, wherein the casting clamping mechanism and the sealing mechanism are both powered by a hydraulic station.

[0006] Furthermore, both sides of the upper surface of the casting positioning plate are provided with sealing grooves, and sealing rings are provided in each sealing groove.

[0007] Furthermore, a first positioning pin is provided on the front side of one of the sealing rings on the casting positioning plate, and a second positioning pin is provided on the rear side of the other sealing ring.

[0008] Furthermore, the detection air intake channel includes an air intake channel that passes through the side of the casting positioning plate and has its outlet located inside the sealing ring. The air intake end of the air intake channel is connected to the air supply equipment via a pipe.

[0009] Furthermore, the casting clamping mechanism includes a pair of corner cylinders vertically installed on the front side of the casting positioning plate. A cantilever pressure rod is fixed on the telescopic rod of the corner cylinder, and a clamping block is provided on the lower side of the cantilever end of the cantilever pressure rod.

[0010] Furthermore, the cantilever end of the cantilever pressure rod is provided with a screw rod from bottom to top and locked and fixed by a nut, and the lower end of the screw rod forms a clamping block.

[0011] Furthermore, the sealing mechanism includes fixed plates disposed on both sides of the casting positioning plate, and transverse hydraulic cylinders with telescopic rods facing the casting positioning plate are respectively installed on the fixed plates. A sealing block is installed on the telescopic rod of the transverse hydraulic cylinder, and a sealing gasket is provided on the inner end face of the sealing block.

[0012] Furthermore, the end of the telescopic rod of the transverse cylinder is provided with a ball head structure that is movably connected to the sealing block, and a limiting step surface is provided on the telescopic rod of the transverse cylinder and on the outside of the ball head structure.

[0013] Furthermore, an installation plate is obliquely arranged on the rear side of the casting positioning plate, and an oblique hydraulic cylinder that extends obliquely forward and downward is fixed on the installation plate. An oblique pressure block is installed on the extension rod of the oblique hydraulic cylinder, and a rear sealing ring for cooperating with the oblique port on the rear side of the casting is installed on the front inclined surface of the oblique pressure block.

[0014] Furthermore, the telescopic rod of the inclined cylinder is movably connected to the inclined pressure block via a ball joint structure, and a pair of inclined guide rods that abut against the lower side of the inclined pressure block are provided on the mounting plate below the inclined pressure block.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] This device clamps the casting using a corner cylinder and seals the casting port using a lateral cylinder in conjunction with a sealing block, ensuring sufficient clamping force for a seal that facilitates subsequent airtightness testing. Furthermore, the sealing block and the corner cylinder, as well as the angled block and the angled cylinder, are all connected movably and equipped with corresponding limiting structures, allowing for better engagement with the casting port and improving sealing performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram (top view) of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the air intake channel detection structure on the casting positioning plate of this utility model;

[0019] Figure 3 This is a schematic diagram of the cantilever compression bar of this utility model;

[0020] Figure 4 This is a cross-sectional view of the sealing block and the telescopic rod of the transverse hydraulic cylinder of this utility model.

[0021] Figure 5This is a side view of the side pressure mechanism of this utility model;

[0022] Figure 6 This is a cross-sectional view of the inclined pressure block and the telescopic rod of the inclined oil cylinder of this utility model.

[0023] In the diagram: 1-Baseboard 2-Casting positioning plate 201-Sealing ring 202-Sealing groove 203-First positioning pin 204-Second positioning pin 210-Inlet channel 211-Outlet 212-Pipe 3-Casting clamping mechanism 301-Corner cylinder 302-Cantilever pressure bar 303-Clamping block 304-Screw 410-Fixing plate 411-Horizontal cylinder 412-Sealing pressure block 413-Sealing gasket 414-Ball head structure 415-Limiting step 420-Mounting plate 421-Angled cylinder 422-Angled pressure block 423-Sealing ring 424-Ball head structure 425-Angled guide rod 51-Distribution block 511-First end 512-Second end 513-First oil outlet pipe 514-Second oil outlet pipe 515-First return oil pipe 516-Second return oil pipe 52-Sequence valve 521-Oil outlet pipe. Detailed Implementation

[0024] To make the above-mentioned features and advantages of this utility model more easily understood, specific embodiments are described below in conjunction with the accompanying drawings, but this utility model is not limited thereto.

[0025] refer to Figures 1 to 6

[0026] A tooling device for testing the air tightness of castings includes a casting positioning plate 2. The casting positioning plate is provided with a sealing ring 201 that mates with the lower port of the casting and has an outlet 211 located inside the sealing ring for testing air inlet. A casting clamping mechanism 3 is provided on the front side of the casting positioning plate, and sealing mechanisms for sealing the remaining ports of the casting are provided on both sides and the rear side of the casting positioning plate. The casting clamping mechanism and the sealing mechanism are both powered by a hydraulic station to ensure the clamping force of the sealing mechanism and the casting clamping mechanism, thereby ensuring the airtightness.

[0027] In this embodiment, the casting positioning plate, the casting clamping mechanism, and the sealing mechanism are all mounted on the base plate 1.

[0028] In this embodiment, sealing grooves 202 are provided on both sides of the upper surface of the casting positioning plate, and sealing rings 201 are provided in the sealing grooves, so that the two sealing rings cooperate with the two ports on the bottom surface of the casting to complete the sealing.

[0029] In this embodiment, in order to better position the casting, a first positioning pin 203 is provided on the front side of one of the sealing rings on the casting positioning plate, and a second positioning pin 204 is provided on the rear side of the other sealing ring, so that the positioning of the casting is completed by the first positioning pin and the second positioning pin.

[0030] In this embodiment, in order to better introduce gas into the cavity of the casting, the detection air inlet channel includes an air inlet channel 210 that enters from the side of the casting positioning plate and has its outlet located inside the sealing ring. The air inlet end of the air inlet channel is connected to the air supply equipment via a pipe 212. Both air inlets avoid the corresponding positioning pins. At the same time, the pipes connecting the two air inlets are connected to the air supply equipment via a main pipe. The air supply equipment is equipped with a pressure leak detector to detect whether the air pressure input to the casting is leaking.

[0031] In this embodiment, in order to press the casting onto the casting positioning table after the casting is positioned, and to press the lower end of the casting into the sealing ring, the casting pressing mechanism includes a pair of corner cylinders 301 vertically installed on the front side of the casting positioning plate. A cantilever pressure rod 302 is fixed on the telescopic rod of the corner cylinder, and a pressing block 303 is provided on the lower side of the cantilever end of the cantilever pressure rod.

[0032] In this embodiment, the cantilever end of the cantilever pressure rod is fitted with a screw 304 from bottom to top and locked in place by a nut. The lower end of the screw forms a clamping block. A brass block can be provided on the surface of the lower end of the screw to help avoid damaging the surface of the casting.

[0033] In this embodiment, to seal the side and rear ports of the casting, the sealing mechanism includes fixed plates 410 disposed on both sides of the casting positioning plate. A transverse hydraulic cylinder 411 with a telescopic rod facing the casting positioning plate is mounted on each fixed plate. A sealing block 412 is mounted on the telescopic rod of the transverse hydraulic cylinder, and a sealing gasket 413 is provided on the inner end face of the sealing block. Thus, the opposing movement of the transverse hydraulic cylinders on both sides drives the sealing blocks to move in opposite directions, thereby sealing the side ports of the casting.

[0034] In this embodiment, in order to allow the sealing gasket to better fit with the side port of the casting, the end of the telescopic rod of the transverse cylinder is provided with a ball head structure 414 that is movably connected to the sealing block. A limiting step surface 415 is provided on the telescopic rod of the transverse cylinder and located outside the ball head structure, thereby avoiding the sealing block from having an excessively large movement angle that would affect its fit with the side port of the casting.

[0035] In this embodiment, in order to seal the rear port of the casting, an installation plate 420 is also obliquely arranged on the rear side of the casting positioning plate. An oblique hydraulic cylinder 421 that extends obliquely forward and downward is fixed on the installation plate. An oblique pressure block 422 is installed on the extension rod of the oblique hydraulic cylinder. A rear sealing ring 423 for cooperating with the oblique port on the rear side of the casting is installed on the front inclined surface of the oblique pressure block.

[0036] In this embodiment, to ensure a tighter fit between the rear sealing ring on the inclined pressure block and the rear port of the casting, the telescopic rod of the inclined cylinder is movably connected to the inclined pressure block via a ball joint structure 424. A pair of inclined guide rods 425 with their front ends angled downwards are provided on the mounting plate below the inclined pressure block, and these guide rods abut against the lower surface of the inclined pressure block. The inclined guide rods guide the movement of the inclined pressure block and prevent it from swinging downwards excessively.

[0037] In this embodiment, in order to press the casting tightly before performing the subsequent port sealing action, a distribution block 51 is installed on the base plate. The distribution block is provided with two first ends 511 and second ends 512 for connecting to the corresponding oil outlet and return port of the hydraulic station. The first outlet on the distribution block is connected to the oil inlet of the corner cylinder via the first oil outlet pipe 513. The second outlet on the distribution block is connected to the sequence valve 52 via the second oil outlet pipe 514. The outlet of the sequence valve is connected to the oil inlet of the horizontal cylinder and the oblique cylinder via the oil outlet pipe 521. The return port of the corner cylinder is connected to the first return port of the distribution block via the first return pipe 515. The horizontal cylinder and the oblique cylinder are connected to the second return port of the distribution block via the second return pipe 516.

[0038] In use, the casting is placed on the casting positioning table. The casting is first pressed by the corner cylinder, and then the side and rear ports of the casting are sealed by the sealing blocks and the inclined blocks. Finally, gas is introduced into the cavity of the casting through the pipeline and pressure is maintained. Leakage is detected by the air pressure leak detector.

[0039] If the terms "first" and "second" are used in the above description to define the components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of distinguishing the components in the description. Unless otherwise stated, the above terms have no special meaning.

[0040] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting or welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0041] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0042] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0043] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A tooling device for testing the airtightness of castings, comprising a casting positioning plate, characterized in that, The casting positioning plate is provided with a sealing ring that matches the port on the lower side of the casting and a detection air inlet channel with the outlet located inside the sealing ring. A casting clamping mechanism is provided on the front side of the casting positioning plate, and sealing mechanisms for sealing the remaining ports of the casting are provided on both sides and the rear side of the casting positioning plate. The casting clamping mechanism and the sealing mechanism are both powered by a hydraulic station.

2. The tooling device for testing the airtightness of castings according to claim 1, characterized in that, Both sides of the upper surface of the casting positioning plate are provided with sealing grooves, and sealing rings are provided in each sealing groove.

3. The tooling device for testing the airtightness of castings according to claim 2, characterized in that, The casting positioning plate has a first positioning pin on the front side of one of the sealing rings and a second positioning pin on the rear side of the other sealing ring.

4. The tooling device for testing the airtightness of castings according to claim 1, characterized in that, The detection air intake channel includes an air intake channel that enters through the side of the casting positioning plate and has its outlet located inside the sealing ring. The air intake end of the air intake channel is connected to the air supply equipment via a pipe.

5. The tooling device for testing the airtightness of castings according to claim 1, 2, 3 or 4, characterized in that, The casting clamping mechanism includes a pair of corner cylinders vertically installed on the front side of the casting positioning plate. A cantilever pressure rod is fixed on the telescopic rod of the corner cylinder, and a clamping block is provided on the lower side of the cantilever end of the cantilever pressure rod.

6. The tooling device for testing the airtightness of castings according to claim 5, characterized in that, The cantilever end of the cantilever pressure rod is provided with a screw rod from bottom to top and is locked and fixed by a nut, and the lower end of the screw rod forms a clamping block.

7. The tooling device for testing the airtightness of castings according to claim 1, 2, 3, 4 or 6, characterized in that, The sealing mechanism includes fixed plates disposed on both sides of the casting positioning plate. A transverse hydraulic cylinder with a telescopic rod facing the casting positioning plate is respectively installed on the fixed plate. A sealing block is installed on the telescopic rod of the transverse hydraulic cylinder, and a sealing gasket is provided on the inner end face of the sealing block.

8. The tooling device for testing the airtightness of castings according to claim 7, characterized in that, The telescopic rod end of the transverse cylinder is provided with a ball head structure that is movably connected to the sealing block, and a limit step surface is provided on the telescopic rod of the transverse cylinder and on the outside of the ball head structure.

9. The tooling device for testing the airtightness of castings according to claim 7, characterized in that, An installation plate is obliquely arranged on the rear side of the casting positioning plate. An oblique hydraulic cylinder that extends obliquely forward and downward is fixed on the installation plate. An oblique pressure block is installed on the extension rod of the oblique hydraulic cylinder. A rear sealing ring for cooperating with the oblique port on the rear side of the casting is installed on the front oblique surface of the oblique pressure block.

10. The tooling device for testing the airtightness of castings according to claim 9, characterized in that, The telescopic rod of the inclined cylinder is movably connected to the inclined pressure block via a ball joint structure. A pair of inclined guide rods that abut against the lower side of the inclined pressure block are provided on the mounting plate below the inclined pressure block.

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