Movable cylinder head air tightness test bench

Abstract

The utility model provides a movable cylinder cover air tightness test board relates to detection frock technical field, including base and stand, the leak detection beam board is installed in the stand and slides, first plugging device, second plugging device and exhaust plugging mechanism are installed on the leak detection beam board, exhaust plugging mechanism includes the plugging frame that sets up symmetrically, plugging shaft sleeve, plugging swing bar, plugging presser foot, mounting seat, plugging bracing piece and return spring, plugging shaft sleeve rotation is installed in the inside of plugging frame, the limit inclined groove is set up on plugging swing bar, and the plugging swing bar between both sides is connected with the support bow piece and slides, the both ends of support bow piece are provided with guide sliding block, and the plugging cylinder is connected between plugging frame and support bow piece, and the lower end of plugging swing bar slides and touches in plugging presser foot outside. The utility model can realize plugging presser foot to slide inwards and plugging seal on the exhaust hole of cylinder cover through plugging cylinder.

Description

Technical Field

[0001] This utility model relates to the field of testing tooling technology, specifically a movable cylinder head airtightness testing bench. Background Technology

[0002] Car engines are typically multi-cylinder engines. The cylinder head is mounted on top of the engine block, sealing the cylinders from above and forming a closed chamber, allowing the pistons to compress fuel and the mixture to generate power. To ensure the normal operation of the engine, the cylinder head needs to undergo an airtightness test before leaving the factory to ensure its sealing performance.

[0003] Before performing a leak test, the various air holes in the cylinder head usually need to be manually sealed using an internal expansion sealing device. However, the sealing efficiency is low. Furthermore, the exhaust holes on the cylinder head are usually non-circular irregular holes with an inclined orientation. The internal expansion sealing device cannot meet the sealing requirements of irregular holes, which will result in insufficient sealing of the through holes on the cylinder head and leakage at the sealing location. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a movable cylinder head airtightness testing bench, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A movable cylinder head airtightness testing platform includes a base and a top plate. Several columns are arranged between the base and the top plate. A leak detection beam plate is slidably installed on the columns. A first sealing device, a second sealing device, and an exhaust sealing mechanism are installed on the leak detection beam plate. The exhaust sealing mechanism includes a sealing frame, a sealing bushing, a sealing swing rod, a sealing pressure plate, and an abutment assembly arranged symmetrically. The sealing frame is vertically slidably installed on the left and right sides of the leak detection beam plate. The sealing bushing is rotatably installed inside the sealing frame. The top of the sealing swing rod is fixed to the outer wall of the sealing bushing. The sealing pressure plate is slidably installed at the lower end of the sealing frame. The lower end of the sealing swing rod slides and abuts against the outer side of the sealing pressure plate. The abutment assembly includes a mounting seat fixed on the sealing frame, a sealing support rod slidably passing through the mounting seat, and a return spring abutting between the rear ends of the mounting seat and the sealing support rod.

[0007] Preferably, the blocking swing rod has a limiting groove, and a supporting bow plate is slidably connected between the two sides of the blocking swing rod. The two ends of the supporting bow plate are provided with guide sliders, which slide through the limiting groove. A blocking cylinder is connected between the blocking frame and the supporting bow plate.

[0008] Preferably, the mounting base is provided with a rotating shaft and a sliding shaft on the side facing the sealing frame. The rotating shaft is rotatably connected to the lower end of the sealing frame. The sealing frame has a sliding arc hole concentric with the rotating shaft. The sliding shaft slides through the sliding arc hole. The end of the sliding shaft is threaded with an abutting nut, which abuts against the inner side of the sealing frame.

[0009] Preferably, the first sealing device includes an adjusting screw, an inner expansion cylinder, an inner expansion ring, a sealing ring 7, and a contraction ring. The adjusting screw is threadedly connected to the leak detection beam plate. The inner expansion cylinder is fixed to the lower end of the adjusting screw. The inner expansion ring is slidably sleeved on the upper part of the cylinder arm of the inner expansion cylinder. The contraction ring is fixed to the lower end of the cylinder arm of the inner expansion cylinder. The sealing ring 7 abuts against the inner expansion ring and the contraction ring. A lifting cylinder is connected between the sealing frame and the top plate. A supporting cylinder is connected between the sealing frame and the leak detection beam plate.

[0010] Preferably, the second sealing device includes a stretching hose connected to the leak detection beam plate and an internally expanding leak detection sealing plug fixed to the end of the stretching hose.

[0011] This invention provides a movable cylinder head airtightness testing bench. It has the following advantages:

[0012] In this invention, the first sealing device seals the air hole at the top of the cylinder head, and the second sealing device seals the air holes at both ends of the cylinder head. By setting a sealing cylinder, the sealing levers on both sides are pulled to swing inward and retract. The sealing pressure plate is slid inward by the contact sliding, thereby sealing the exhaust hole on the cylinder head, which is usually a non-circular irregular hole, to ensure the sealing of the exhaust hole during the leak detection process.

[0013] In this invention, the angle of the sealing strut can be adjusted by tightening and loosening the mounting seat through the contact nut, so that the sealing pressure plate can be kept in the same tilt angle as the exhaust hole on the side wall of the cylinder head, thereby achieving a better sealing effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a movable cylinder head airtightness testing platform according to the present invention.

[0015] Figure 2 This is a schematic diagram of the leak detection beam plate in this utility model;

[0016] Figure 3 This is a schematic diagram of the exhaust sealing mechanism in this utility model.

[0017] In the diagram: 1. Base; 2. Column; 3. Leak detection beam; 4. Adjusting screw; 5. Internal expansion cylinder; 6. Internal expansion ring; 7. Sealing ring; 8. Contraction ring; 9. Tension hose; 10. Internal expansion leak detection sealing plug; 11. Sealing frame; 12. Sealing bushing; 13. Sealing swing rod; 14. Sealing pressure plate; 15. Lifting cylinder; 16. Support cylinder; 17. Guide slide rail; 18. Limiting groove; 19. Support bow plate; 20. Sealing cylinder; 21. Mounting seat; 22. Sealing support rod; 23. Return spring; 24. Rotating shaft; 25. Sliding shaft; 26. Contact nut. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] This utility model provides a movable cylinder head airtightness testing platform, such as... Figure 1-3 As shown, it includes a base 1 and a top plate, with several columns 2 arranged between the base 1 and the top plate. A leak detection beam plate 3 is slidably installed on the columns 2. The leak detection beam plate 3 is equipped with a first sealing device for sealing the air holes on the top of the cylinder head, a second sealing device for sealing the air holes on the front and rear sides of the cylinder head, and an exhaust sealing mechanism for blocking the non-circular irregular holes on the left and right sides of the cylinder head.

[0020] like Figure 2 As shown, the first sealing device includes an adjusting screw 4, an inner expansion cylinder 5, an inner expansion ring 6, a sealing ring 7, and a contraction ring 8. The leak detection beam plate 3 has several mounting screw holes in its center. The adjusting screw 4 is threaded through these mounting screw holes. The inner expansion cylinder 5 is fixed to the lower end of the adjusting screw 4. The cylinder arm of the inner expansion cylinder 5 is positioned directly above the air hole on the upper side of the cylinder head. The leak detection beam plate 3 slides down on the column 2, passing through and sealing directly above the air hole on the upper side of the cylinder head, thus achieving sealing of the cylinder. To seal the vent on the upper side of the cylinder head, the inner expansion ring 6 is slidably sleeved on the upper part of the cylinder arm of the inner expansion cylinder 5. The inner expansion ring 6 is fixed to the cylinder wall of the inner expansion cylinder 5. The contraction ring 8 is fixed to the lower end of the cylinder arm of the inner expansion cylinder 5. The contraction of the cylinder arm of the inner expansion cylinder 5 can shorten the distance between the inner expansion ring 6 and the contraction ring 8. The sealing ring 7 abuts between the inner expansion ring 6 and the contraction ring 8. By squeezing the upper and lower ends of the sealing ring 7 through the inner expansion ring 6 and the contraction ring 8, the sealing ring expands outward, thereby sealing the vent on the upper side of the cylinder head.

[0021] like Figure 2As shown, the second sealing device includes a stretching hose 9 connected to the leak detection beam plate 3 and an internally expanding leak detection sealing plug 10 fixed to the end of the stretching hose 9. The internally expanding leak detection sealing plug 10 includes a sealing cylinder, a contact ring, a sealing ring, and an internal expansion ring. The sealing cylinder is connected to the stretching hose 9. The contact ring is fixed to the cylinder wall of the sealing cylinder, and the sealing ring is fixed to the lower end of the cylinder arm of the sealing cylinder. The contact ring and the sealing ring sandwich the internal expansion ring in the middle. Pulling the stretching hose can place the internally expanding leak detection sealing plug 10 in any position to facilitate blocking the air holes on both sides of the cylinder head.

[0022] like Figure 3As shown, the exhaust sealing mechanism includes a symmetrically arranged sealing frame 11, sealing bushing 12, sealing swing rod 13, sealing pressure plate 14, and abutment assembly. A lifting cylinder 15 connects the sealing frame 11 to the top plate, and a support cylinder 16 connects the sealing frame 11 to the leak detection beam plate 3. The extension and retraction of the lifting cylinder 15 can push the sealing frame 11 and the leak detection beam plate 3 as a whole to slide up and down on the column 2, thereby sliding the first sealing device down into the air hole at the top of the sealing cylinder head and completing the sealing. Guide grooves are provided on the front and rear sides of the leak detection beam plate 3, and guide rails 17 are vertically arranged on the left and right sides of the sealing frame 11. The sliding connection is in the guide groove, so that the exhaust sealing mechanism can slide up and down relative to the leak detection beam plate 3 by the extension and retraction of the support cylinder 16, so that the sealing pressure plate 14 can be directly aligned with the height of the exhaust holes on the left and right sides of the cylinder head. The sealing frame 11 is vertically slidably installed on the left and right sides of the leak detection beam plate 3. The sealing frame 11 includes a fixed connecting beam plate and sealing brackets on the left and right sides of the connecting beam plate. The sealing bracket includes two parallel vertical support plates. The guide rail 17 is set on the outside of the vertical support plates. The sealing bushing 12 is rotatably installed on the inside of the two vertical support plates. The top of the sealing swing rod 13 is fixed on the outer wall of the sealing bushing 12. The sealing pressure plate 14 The sealing frame 11 is slidably installed at its lower end. The lower end of the sealing swing rod 13 slides against the outside of the sealing pressure plate 14. A limiting groove 18 is provided on the sealing swing rod 13. The limiting groove 18 between the corresponding sealing swing rods 13 on the left and right sides is set in a symmetrical figure-eight shape. A support bow plate 19 is slidably connected between the sealing swing rods 13 on both sides. The two ends of the support bow plate 19 are provided with guide sliders. The guide sliders slide through the limiting grooves. A sealing cylinder 20 is connected between the sealing frame 11 and the support bow plate 19. The sealing cylinder 20 can pull the support bow plate 19 up and down by retracting. In this way, the guide slider slides in the limiting groove 18 to achieve left and right sides The blocking lever 13 is oscillating and clamped. The abutment assembly includes a mounting base 21 fixed on the blocking frame 11, a blocking support rod 22 slidably passing through the mounting base 21, and a return spring 23 abutting between the rear ends of the mounting base 21 and the blocking support rod 22. The mounting base 21 is provided with a rotating shaft 24 and a sliding shaft 25 on the side facing the blocking frame 11. The rotating shaft 24 is rotatably connected to the lower end of the blocking frame 11. The blocking frame 11 is provided with a sliding arc hole concentric with the rotating shaft 24. The sliding shaft 25 slides through the sliding arc hole. The end of the sliding shaft 25 is threaded with an abutment nut 26. The abutment nut 26 abuts against the inner side of the blocking frame 11.

[0023] Workflow:

[0024] In use, the cylinder head leak detection fixture described in this application allows for adjustment of the relative height between the first sealing device and the leak detection beam 3 by rotating the adjusting screw 4. This adjusts the sealing ring 7 to be at the optimal height relative to the air hole on the upper side of the cylinder head, facilitating the sealing of the air hole. During operation, the lifting cylinder 15 extends and retracts, causing the leak detection beam 3, the first sealing device, the second sealing device, and the exhaust sealing mechanism to slide up and down as a whole until the first sealing device penetrates into the air hole on the upper side of the cylinder head. Then, the internal expansion cylinder 5 retracts, completing the internal expansion sealing. Finally, the second sealing device is manually removed. The device seals the air holes on both sides of the cylinder head. Then, the height of the exhaust sealing mechanism is adjusted by extending and retracting the support cylinder 16 so that the height of the sealing pressure plate 14 is aligned with the height of the exhaust holes on the left and right sides of the cylinder head. Finally, the sealing cylinder 20 retracts, and the guide sliders on both sides of the support arch plate 19 slide in the limiting inclined groove 18 and limit the width on both sides. This causes the sealing swing rod 13 to swing inward, and the lower end of the sealing swing rod 13 slides inward. It then slides inward by pressing against the sealing pressure plate 14 and compressing the return spring 23, and then presses against the outside of the exhaust holes on the left and right sides of the cylinder head to achieve sealing.

[0025] In addition, the sliding shaft 25 and the sliding arc hole can be locked and loosened by turning the contact nut 26 to adjust the extension angle of the sealing support rod 22 on the mounting base 21. This allows the tilt angle of the sealing pressure plate 14 to be consistent with the tilt angle of the exhaust port on the left and right sides of the cylinder head, thereby improving the sealing effect of the sealing pressure plate 14 on the exhaust cylinder.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A movable cylinder head airtightness testing platform, comprising a base and a top plate, wherein a plurality of columns are disposed between the base and the top plate, characterized in that: A leak detection beam plate is slidably installed on the column. A first sealing device, a second sealing device, and an exhaust sealing mechanism are installed on the leak detection beam plate. The exhaust sealing mechanism includes a sealing frame, a sealing bushing, a sealing swing rod, a sealing pressure plate, and an abutment assembly arranged symmetrically. The sealing frame is vertically slidably installed on the left and right sides of the leak detection beam plate. The sealing bushing is rotatably installed on the inner side of the sealing frame. The top of the sealing swing rod is fixed to the outer wall of the sealing bushing. The sealing pressure plate is slidably installed at the lower end of the sealing frame. The lower end of the sealing swing rod slides and abuts against the outer side of the sealing pressure plate. The abutment assembly includes a mounting base fixed on the sealing frame, a sealing support rod slidably passing through the mounting base, and a return spring abutting between the rear ends of the mounting base and the sealing support rod.

2. The movable cylinder head airtightness testing bench according to claim 1, characterized in that: The blocking swing rod has a limiting groove, and a support bow is slidably connected between the two sides of the blocking swing rod. The two ends of the support bow are provided with guide sliders, which slide through the limiting groove. A blocking cylinder is connected between the blocking frame and the support bow.

3. The movable cylinder head airtightness testing bench according to claim 2, characterized in that: The mounting base is provided with a rotating shaft and a sliding shaft on the side facing the sealing frame. The rotating shaft is rotatably connected to the lower end of the sealing frame. The sealing frame has a sliding arc hole concentric with the rotating shaft. The sliding shaft slides through the sliding arc hole. The end of the sliding shaft is threaded with an abutting nut, which abuts against the inner side of the sealing frame.

4. The movable cylinder head airtightness testing bench according to claim 3, characterized in that: The first sealing device includes an adjusting screw, an inner expansion cylinder, an inner expansion ring, a sealing ring, and a contraction ring. The adjusting screw is threadedly connected to the leak detection beam plate. The inner expansion cylinder is fixed to the lower end of the adjusting screw. The inner expansion ring is slidably sleeved on the upper part of the cylinder arm of the inner expansion cylinder. The contraction ring is fixed to the lower end of the cylinder arm of the inner expansion cylinder. The sealing ring abuts against the inner expansion ring and the contraction ring. A lifting cylinder is connected between the sealing frame and the top plate. A supporting cylinder is connected between the sealing frame and the leak detection beam plate.

5. A movable cylinder head airtightness testing bench according to claim 4, characterized in that: The second sealing device includes a stretching hose connected to the leak detection beam plate and an internally expanding leak detection sealing plug fixed to the end of the stretching hose.

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