A rapid positioning fixture for airtightness testing

Abstract

This utility model relates to the field of testing technology for gasoline engines in micro-tillers, specifically to a quick-positioning fixture for airtightness testing. It includes a mounting plate with a guide groove on one outer wall. Two circular support frames are symmetrically slidably mounted within the guide groove. Two extension blocks are integrally formed on the side of each circular support frame near the mounting plate, slidably mounted inside the guide groove. Two clamping plates are symmetrically arranged within each circular support frame, and a drive mechanism is mounted on the outer side of each circular support frame. This utility model, through the mounting plate, guide groove, circular support frames, and clamping plates with lead screws and guide rods, combined with a drive mechanism including an adjustment knob, achieves bidirectional clamping and positioning of the test piece, and assists in alignment, increasing convenience during use. The sliding engagement between the guide groove and the circular support frames allows the airtightness testing end to be tightened and stabilized after connection to the gasoline engine, and it can accommodate airtightness testing ends of different sizes and gasoline engines.

Description

Technical Field

[0001] This utility model relates to the field of testing technology for gasoline engines in micro-tillers, specifically a quick positioning fixture for airtightness testing. Background Technology

[0002] As a commonly used small piece of machinery in agricultural production, the performance of the core power component of a mini tiller—the gasoline engine—directly affects its working efficiency and service life. During the gasoline engine manufacturing process, airtightness testing is a crucial step. Only by ensuring that all components of the gasoline engine are well-sealed can problems such as air and oil leaks be avoided, guaranteeing its stable operation.

[0003] In traditional micro-tiller gasoline engine air tightness testing, manual positioning and fixing are typically used to connect the test head to the part of the gasoline engine to be tested. This method has several drawbacks. On the one hand, due to the instability of manual operation, it is difficult to ensure precise alignment between the test head and the gasoline engine, which can easily lead to a loose connection and affect the accuracy of the air tightness test results. On the other hand, existing positioning fixtures are often structurally simple and difficult to adapt to different models and sizes of micro-tiller gasoline engines and air tightness test heads, resulting in poor versatility.

[0004] In view of this, we propose a rapid positioning fixture for airtightness testing. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a rapid positioning fixture for airtightness testing.

[0006] The technical solution of this utility model is: A quick positioning fixture for airtightness testing includes a mounting plate. A guide groove is formed on one outer wall of the mounting plate. Two circular support frames are symmetrically slidably mounted within the guide groove. Two extension blocks are integrally formed on the side of the circular support frame closest to the mounting plate. The extension blocks are slidably mounted inside the guide groove. Two clamping plates are symmetrically arranged within the circular support frames. A lead screw is installed at the center of the outer wall of each clamping plate on the side furthest from each other. Two guide rods are symmetrically fixed at both ends of the outer wall of the furthest side of the clamping plates. The outer ends of the lead screws and guide rods slide through the circular support frames and extend to the outside. A driving mechanism is mounted on the outside of the circular support frames. The driving mechanism includes a driving frame, within which two adjusting knobs are rotatably mounted and threaded to the outer walls of the two lead screws.

[0007] In use, the mounting plate, guide groove, circular support frame, and clamping plate with lead screw and guide rod, along with a drive mechanism containing an adjustment knob, enable bidirectional clamping and positioning of the test piece, and assist in alignment, increasing ease of use. The sliding fit between the guide groove and the circular support frame allows the airtightness test tip to be tightened after connection to the gasoline engine to ensure a stable connection, and it can accommodate airtightness test tips and gasoline engines of different sizes.

[0008] As a preferred technical solution, the outer wall of the extension block is tightly slidably fitted with the inner wall of the guide groove, which enhances the stability of the circular support frame when sliding in the guide groove, avoids shaking or displacement during the sliding process, and ensures clamping and positioning accuracy.

[0009] As a preferred technical solution, a tightening screw is rotatably installed within the guide groove. The tightening screw is divided into two sections with opposite thread lines in the middle, and the extension block is threadedly connected to the two sections with opposite thread lines of the tightening screw. Rotating the tightening screw drives the two circular support frames to move synchronously in opposite directions along the guide groove, tightening the airtightness test end and the gasoline engine cylinder respectively connected in the two circular support frames to stabilize the connection between them.

[0010] As a preferred technical solution, one end of the tightening screw extends rotatably to the outside of the mounting plate and is coaxially and integrally formed with a screw head, which is screw-shaped. The screw head at one end of the tightening screw makes it easier for operators to turn the tightening screw using tools such as wrenches, which is more labor-saving compared to a design without a screw head.

[0011] As a preferred technical solution, an anti-slip pad is fixedly installed on the outer wall of each of the two clamping plates that are close to each other. The anti-slip pad has anti-slip patterns perpendicular to its length direction. The anti-slip pad and anti-slip patterns on the clamping plates increase the friction between the clamping plates and the test piece, which can effectively prevent the test piece from sliding or rotating during the clamping process and ensure the stability of the test piece during the airtightness test.

[0012] As a preferred technical solution, the drive frame is U-shaped, and a transverse transmission rod is rotatably mounted at both the top and bottom inside it. The end of the transverse transmission rod near the adjustment knob is connected to the adjustment knob via a bevel gear set. Through the transmission between the bevel gear set and the adjustment knob, the rotational motion of the adjustment knob is converted into the rotation of the transverse transmission rod, thereby transmitting the driving force to subsequent components.

[0013] As a preferred technical solution, two vertical transmission rods are symmetrically and rotatably mounted inside the vertical part of the drive frame. The ends of the two vertical transmission rods that are far apart from each other are respectively connected to the ends of the two horizontal transmission rods that are far away from the corresponding adjustment knobs through a bevel gear set. The vertical transmission rods and the horizontal transmission rods are driven by the bevel gear set, realizing the conversion of power in the horizontal and vertical directions.

[0014] As a preferred technical solution, a drive block is rotatably mounted on the outer wall of the drive frame, located between the two vertical transmission rods. The drive block is connected to the two vertical transmission rods via a bevel gear set. By rotating the drive block, the two vertical transmission rods can be driven to move synchronously simultaneously, thereby achieving synchronous adjustment of the two clamping plates. This ensures the consistency of the movement of the two clamping plates, resulting in uniform force on both sides of the test piece and preventing test piece offset caused by unilateral adjustment.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This invention achieves bidirectional clamping and positioning of the test piece by setting up an mounting plate, guide groove, circular support frame, and clamping plate with lead screw and guide rod, and cooperating with a drive mechanism containing an adjustment knob. It also assists in alignment, increasing convenience during use. The sliding fit between the guide groove and the circular support frame can tighten the airtightness test tip after connection to the gasoline engine to ensure a stable connection, and it can adapt to the use of airtightness test tips and gasoline engines of different sizes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the circular support frame and drive mechanism of this utility model; Figure 3 This is a schematic diagram of the drive mechanism in this utility model; Figure 4 In this utility model Figure 3 Enlarged view of point A in the image; The meanings of the labels in the diagram are as follows: 1. Mounting plate; 10. Guide groove; 2. Circular support frame; 20. Extension block; 21. Clamping plate; 22. Guide rod; 23. Lead screw; 24. Anti-slip pad; 3. Drive mechanism; 30. Drive frame; 31. Vertical transmission rod; 32. Horizontal transmission rod; 33. Adjustment knob; 34. Bevel gear set; 35. Drive block; 4. Tightening screw; 40. Tightening head. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-4This utility model provides a technical solution: A quick positioning fixture for airtightness testing includes a mounting plate 1. A guide groove 10 is provided on one outer wall of the mounting plate 1. Two circular support frames 2 are symmetrically slidably installed in the guide groove 10. Two extension blocks 20 are integrally formed on the side of the circular support frame 2 closest to the mounting plate 1. The extension blocks 20 are slidably installed inside the guide groove 10. Two clamping plates 21 are symmetrically arranged inside the circular support frame 2. A lead screw 23 is installed at the center of the outer wall of the side of the two clamping plates 21 that is far apart from each other. Two guide rods 22 are symmetrically fixed at both ends of the outer wall of the side of the two clamping plates 21 that is far apart from each other. The outer ends of the lead screw 23 and the guide rods 22 extend outward through the circular support frame 2. A drive mechanism 3 is installed on the outside of the circular support frame 2. The drive mechanism 3 includes a drive frame 30. The top and bottom of the outer side of the circular support frame 2 are respectively fixedly connected to the top wall and bottom wall of the inner side of the drive frame 30. Two adjusting knobs 33 are rotatably installed inside the drive frame 30 and are respectively threaded to the outer wall of the two lead screws 23.

[0019] In use, by setting up the mounting plate 1, guide groove 10, circular support frame 2, and clamping plate 21 with lead screw 23 and guide rod 22, and cooperating with the drive mechanism 3 containing adjustment knob 33, bidirectional clamping and positioning of the test piece is achieved, and alignment can be assisted, increasing the convenience of use. The sliding engagement between guide groove 10 and circular support frame 2 can tighten the airtightness test end after it is connected to the gasoline engine to stabilize the connection, and can adapt to the use of airtightness test ends and gasoline engines of different sizes.

[0020] As a preferred embodiment, the outer wall of the extension block 20 is tightly slidably fitted with the inner wall of the guide groove 10, which enhances the stability of the circular support frame 2 when sliding in the guide groove 10, avoids shaking or displacement during the sliding process, and ensures clamping and positioning accuracy.

[0021] In a preferred embodiment, a tightening screw 4 is rotatably installed within the guide groove 10. The tightening screw 4 is divided into two sections with opposite thread lines in the middle, and the extension block 20 is threadedly connected to the two sections with opposite thread lines of the tightening screw 4. Rotating the tightening screw 4 drives the two circular support frames 2 to move synchronously in opposite directions along the guide groove 10, tightening the airtightness test end and the gasoline engine cylinder respectively connected in the two circular support frames 2 to stabilize the connection between them.

[0022] In a preferred embodiment, one end of the tightening screw 4 extends rotatably to the outside of the mounting plate 1 and is coaxially fixed in one piece with a screw head 40. The screw head 40 is screw-shaped. The screw head 40 at one end of the tightening screw 4 makes it easier for operators to turn the tightening screw 4 with tools such as wrenches, which is more labor-saving compared to a design without a screw head 40.

[0023] In a preferred embodiment, each of the two clamping plates 21 has an anti-slip pad 24 fixedly installed on its outer wall, which is close to each other. The anti-slip pad 24 has anti-slip patterns perpendicular to its length direction. The anti-slip pad 24 and anti-slip patterns on the clamping plates 21 increase the friction between the clamping plates 21 and the test piece, which can effectively prevent the test piece from sliding or rotating during the clamping process and ensure the stability of the test piece during the airtightness test.

[0024] In a preferred embodiment, the drive frame 30 is U-shaped, and a transverse transmission rod 32 is rotatably mounted on both its top and bottom. The end of the transverse transmission rod 32 near the adjustment knob 33 is connected to the adjustment knob 33 via a bevel gear set 34. The end of the transverse transmission rod 32 is connected to the adjustment knob 33 via the bevel gear set 34, so that the rotational movement of the adjustment knob 33 can be converted into the rotation of the transverse transmission rod 32, thereby transmitting the driving force to subsequent components.

[0025] In a preferred embodiment, two vertical transmission rods 31 are symmetrically and rotatably mounted inside the vertical section of the drive frame 30. The ends of the two vertical transmission rods 31 that are far apart from each other are respectively connected to the ends of the two horizontal transmission rods 32 that are far away from the corresponding adjustment knobs 33 via a bevel gear set 34. The vertical transmission rods 31 and the horizontal transmission rods 32 are driven by the bevel gear set 34, realizing the conversion of power in the horizontal and vertical directions.

[0026] In a preferred embodiment, a drive block 35 is rotatably mounted on the outer wall of the drive frame 30, located between the two vertical transmission rods 31. The drive block 35 is connected to the two vertical transmission rods 31 via a bevel gear set 34. Rotating the drive block 35 simultaneously drives the two vertical transmission rods 31 to move synchronously, thereby achieving synchronous adjustment of the two clamping plates 21. This ensures the consistency of movement of the two clamping plates 21, resulting in uniform force on both sides of the test piece and preventing test piece offset due to unilateral adjustment.

[0027] In use, the quick positioning fixture for air tightness testing of this utility model first places the cylinder of the mini-tiller's gasoline engine and the air tightness testing end into two circular support frames 2 respectively. By rotating the drive block 35, it drives two vertical transmission rods 31 to move synchronously through the bevel gear set 34. The vertical transmission rods 31 then drive the horizontal transmission rod 32 to rotate through the bevel gear set 34. The horizontal transmission rod 32 transmits power to the adjustment knob 33 through the bevel gear set 34, causing the adjustment knob 33 to rotate. Since the adjustment knob 33 is threadedly connected to the lead screw 23, the lead screw 23 drives the clamping plate 21 to move stably along the guide rod 22. The two clamping plates 21 move closer synchronously, and the anti-slip pads 24 on the inner sides clamp and fix the cylinder and the testing end respectively, ensuring that the two are stably positioned within the circular support frame 2 and preventing slippage or rotation.

[0028] Afterwards, the operator rotates the screw head 40 of the tightening screw 4, causing the tightening screw 4 to rotate. Because the tightening screw 4 is divided into two sections with opposite thread lines in the middle, and each section is threadedly connected to the extension blocks 20 of the two circular support frames 2, the two circular support frames 2 move synchronously in opposite directions along the guide groove 10, approaching each other, thereby tightening and tightly engaging the cylinder and the test end, achieving a stable connection between the two, providing a reliable clamping and sealing foundation for airtightness testing, and the overall structure can be adjusted to accommodate cylinders and test ends of different sizes.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rapid positioning fixture for airtightness testing, characterized in that: The system includes a mounting plate (1), on one side of which an outer wall has a guide groove (10). Two circular support frames (2) are symmetrically slidably installed in the guide groove (10). Two extension blocks (20) are integrally formed on the side of the circular support frame (2) near the mounting plate (1). The extension blocks (20) are slidably installed inside the guide groove (10). Two clamping plates (21) are symmetrically arranged inside the circular support frame (2). A lead screw (23) is installed at the center of the outer wall of the two clamping plates (21) on the side away from each other. Two guide rods (22) are symmetrically fixed at both ends of the outer wall of the two clamping plates (21) on the side away from each other. The outer ends of the lead screw (23) and the guide rods (22) slide through the circular support frame (2) and extend to the outside. A drive mechanism (3) is installed on the outside of the circular support frame (2). The drive mechanism (3) includes a drive frame (30). Two adjusting knobs (33) are rotatably installed in the drive frame (30) and are threaded to the outer walls of the two lead screws (23).

2. The rapid positioning fixture for airtightness testing as described in claim 1, characterized in that: The outer wall of the extension block (20) is in close sliding contact with the inner wall of the guide groove (10).

3. The rapid positioning fixture for airtightness testing as described in claim 2, characterized in that: A tightening screw (4) is rotatably installed in the guide groove (10). The tightening screw (4) is divided into two sections with opposite thread lines in the middle. The two extension blocks (20) are respectively threaded to the two sections with opposite thread lines of the tightening screw (4).

4. The rapid positioning fixture for airtightness testing as described in claim 3, characterized in that: One end of the tightening screw (4) extends to the outside of the mounting plate (1) and is coaxially fixed in one piece with a screw head (40), which is screw head shaped.

5. The rapid positioning fixture for airtightness testing as described in claim 4, characterized in that: An anti-slip pad (24) is fixedly installed on the outer wall of each of the two clamps (21) that are close to each other. The anti-slip pad (24) has anti-slip patterns perpendicular to its length direction.

6. The rapid positioning fixture for airtightness testing as described in claim 5, characterized in that: The drive frame (30) is U-shaped, and a transverse transmission rod (32) is rotatably mounted on both the top and bottom inside it. The end of the transverse transmission rod (32) near the adjustment knob (33) is connected to the adjustment knob (33) via a bevel gear set (34).

7. The rapid positioning fixture for airtightness testing as described in claim 6, characterized in that: The drive frame (30) has two vertical transmission rods (31) symmetrically rotated inside its vertical part. The ends of the two vertical transmission rods (31) that are far apart from each other are respectively connected to the ends of the two horizontal transmission rods (32) that are far away from the corresponding adjustment knobs (33) through a bevel gear set (34).

8. The rapid positioning fixture for airtightness testing as described in claim 7, characterized in that: A drive block (35) is rotatably mounted on the outer wall of the drive frame (30) and located between two vertical transmission rods (31). The drive block (35) is connected to the two vertical transmission rods (31) via a bevel gear set (34).

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