Positioning tool for piston machining

Abstract

The utility model belongs to the technical field of positioning tools, and particularly relates to a positioning tool for piston machining, which comprises a clamping seat and fixing plates, the fixing plates are symmetrically welded on the surfaces of two sides of the clamping seat, a positioning groove is arranged on the surface of the clamping seat, a piston ring is movably inserted into an inner cavity of the positioning groove, a connecting rod is rotatably connected onto the piston ring, and the connecting rod is connected with the clamping seat. A bearing bush is connected to the top of the connecting rod, arc-shaped limiting hoops are symmetrically arranged in an inner cavity of the positioning groove, the inner walls of the arc-shaped limiting hoops abut against the surface of the piston ring, and a bottom supporting plate is movably arranged at the bottom of the inner cavity of the positioning groove and abuts against the lower surface of the piston ring. The two sides of a piston ring can be clamped through the arc-shaped limiting hoop, meanwhile, the upper pressing plate abuts against the upper surface of the piston ring and is magnetically attracted and fixed through the attraction magnetic block, the end of the connecting rod locking lead screw abuts against the surfaces of the two sides of the connecting rod through the limiting top base, rapid clamping of the piston can be achieved, and clamping of the piston is more stable; the machining precision of the piston is improved.

Description

A positioning fixture for piston machining Technical Field

[0001] This utility model relates to the field of positioning tooling technology, specifically a positioning tooling for piston processing. Background Technology

[0002] A piston engine, also called a reciprocating engine, is an engine that uses one or more pistons to convert pressure into rotational kinetic energy. The most common reciprocating engines use gasoline or diesel fuel to generate pressure. There is usually more than one piston; each piston is inside a cylinder where a fuel-air mixture is injected and ignited. The hot gases expand, pushing the piston backward. This linear motion of the piston is converted into circular motion by connecting rods and a crankshaft. This type of engine is often commonly referred to as an internal combustion engine, although an internal combustion engine does not necessarily include pistons.

[0003] Currently, patent application CN105604726B discloses a piston for an internal combustion engine comprising a piston body forming a crown portion and a skirt portion. The skirt portion includes an orifice for receiving a pin for connecting the piston to a connecting rod, and the crown portion forms a bowl surrounded by a flat crown surface having an annular shape and arranged along a plane. The bowl and flat crown portions meet along a circular edge surrounding the edge of the bowl. The piston also includes an annular protrusion disposed within the bowl adjacent to the edge. The annular protrusion has a generally convex shape in a cross-section formed by an upper inwardly extending surface and a lower inwardly extending surface meeting along the apex of the protrusion. The piston also includes a wing surface formed within the flat crown surface. The wing surface has a convex shape and extends annularly around the edge of the bowl.

[0004] After the engine has been running for a long time, the bearing shell of the engine piston will wear, which requires machining or replacement of the worn parts. The piston ring and connecting rod are movably connected. Existing positioning fixtures are inconvenient to clamp the piston ring and connecting rod during use, and the swing of the connecting rod will affect the machining accuracy of the piston. In order to solve the above problems, this application proposes a positioning fixture for piston machining. Summary of the Invention

[0005] (a) Purpose of the utility model

[0006] To address the technical problems existing in the background art, this utility model proposes a positioning fixture for piston processing. An arc-shaped limiting clamp can hold both sides of the piston ring, while an upper pressure plate abuts against the upper surface of the piston ring and is magnetically fixed by an adsorption magnet. The end of the connecting rod locking screw abuts against both sides of the connecting rod surface through a limiting top seat. This allows for rapid and stable clamping of the piston, improving the processing accuracy and solving the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To solve the above technical problems, this utility model provides a positioning fixture for piston processing, including a clamping seat and a fixing plate. The fixing plate is symmetrically welded to both sides of the clamping seat. A positioning groove is opened on the surface of the clamping seat. A piston ring is movably inserted into the inner cavity of the positioning groove. A connecting rod is rotatably connected to the piston ring. A bearing is connected to the top of the connecting rod.

[0009] The positioning groove is symmetrically provided with arc-shaped limiting rings, the inner wall of the arc-shaped limiting rings abuts against the surface of the piston ring, and a bottom support plate is movably provided at the bottom of the positioning groove, the bottom support plate abuts against the lower surface of the piston ring;

[0010] The clamping seat surface is rotatably connected to an upper pressure plate. When the upper pressure plate is closed, it abuts against the upper surface of the piston ring. The upper pressure plate surface is provided with a clearance groove, and the connecting rod is inserted into the clearance groove.

[0011] The surface of the clamping seat is embedded with an adsorption magnetic block, which is magnetically attracted to the upper pressure plate.

[0012] Preferably, a transverse adjusting screw is threaded through the two sides of the clamping seat at the position corresponding to the arc-shaped limiting hoop, and the transverse adjusting screw is rotatably connected to the arc-shaped limiting hoop.

[0013] Preferably, the bottom of the clamping seat is threadedly connected to a lifting adjustment screw, and the top of the lifting adjustment screw is rotatably connected to the bottom support plate.

[0014] Preferably, the bottom support plate has an integrally formed limiting protrusion on its surface, and the bottom surface of the piston ring has a limiting groove, with the limiting protrusion and the limiting groove being inserted into each other.

[0015] Preferably, the upper pressure plate has an integrally formed opening handle, and the opening handle is threadedly connected to a connecting rod locking screw.

[0016] Preferably, the end of the connecting rod locking screw is rotatably connected to a limiting top seat, and the limiting top seat abuts against the surface of the connecting rod.

[0017] Preferably, the lifting adjustment screw is threaded with a locking nut, which abuts against the lower surface of the clamping seat.

[0018] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0019] 1. This utility model uses an arc-shaped limiting clamp to clamp both sides of the piston ring. At the same time, the upper pressure plate abuts against the upper surface of the piston ring and is magnetically fixed by an adsorption magnetic block. The end of the connecting rod locking screw abuts against both sides of the connecting rod through a limiting top seat. This enables rapid clamping of the piston and makes the piston clamping more stable, thereby improving the processing accuracy of the piston.

[0020] 2. In this utility model, the arc-shaped limiting clamp can clamp piston rings of different diameters. At the same time, the rotating lifting adjustment screw pushes the bottom support plate to rise and fall under the action of the surface thread. It can meet the positioning of piston rings of different heights and can clamp and position pistons of different models. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the overall structure of a positioning fixture for piston processing according to this utility model;

[0022] Figure 2 is a schematic diagram of the piston fixing structure of a positioning fixture for piston processing according to this utility model;

[0023] Figure 3 is a schematic diagram of the piston structure of a positioning fixture for piston processing according to this utility model;

[0024] Figure 4 is a cross-sectional schematic diagram of a positioning fixture for piston processing according to this utility model.

[0025] Figure label:

[0026] 1. Clamping seat; 2. Fixing plate; 3. Piston ring; 4. Connecting rod; 5. Bearing bush; 6. Arc-shaped limiting clamp; 7. Lateral adjusting screw; 8. Bottom support plate; 9. Lifting adjusting screw; 10. Limiting protrusion; 11. Limiting groove; 12. Upper pressure plate; 13. Opening handle; 14. Connecting rod locking screw; 15. Limiting top seat; 16. Locking nut; 17. Adsorption magnetic block. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0028] As shown in Figures 1-4, the present invention proposes a positioning fixture for piston processing, including a clamping seat 1 and a fixing plate 2. The fixing plate 2 is symmetrically welded to both sides of the clamping seat 1. A positioning groove is provided on the surface of the clamping seat 1. A piston ring 3 is movably inserted into the inner cavity of the positioning groove. A connecting rod 4 is rotatably connected to the piston ring 3. A bearing 5 is connected to the top of the connecting rod 4.

[0029] The positioning groove is symmetrically provided with arc-shaped limiting clamps 6, the inner wall of the arc-shaped limiting clamps 6 abuts against the surface of the piston ring 3, and the bottom of the positioning groove is movably provided with a bottom support plate 8, which abuts against the lower surface of the piston ring 3.

[0030] The upper pressure plate 12 is rotatably connected to the surface of the clamping seat 1. When the upper pressure plate 12 is closed, it abuts against the upper surface of the piston ring 3. A clearance groove is provided on the surface of the upper pressure plate 12, and the connecting rod 4 is inserted into the clearance groove.

[0031] The surface of the clamping seat 1 is embedded with an adsorption magnetic block 17, which is magnetically attracted to the upper pressure plate 12.

[0032] It should be noted that the piston ring 3 is inserted into the positioning groove on the clamping seat 1, and the bottom of the piston ring 3 is inserted into the limiting protrusion 10 through the limiting groove 11, which can limit the piston ring 3. Rotating the lateral adjustment screw 7, the lateral adjustment screw 7 pushes the arc-shaped limiting clamp 6 against the surface of the piston ring 3 under the action of the surface thread. At the same time, the upper pressure plate 12 is opened and closed by the opening handle 13. After closing, the upper pressure plate 12 abuts against the upper surface of the piston ring 3. The magnetic block 17 is magnetically attracted and fixed to the upper pressure plate 12. Rotating the connecting rod locking screw 14, the end of the connecting rod locking screw 14 abuts against the two sides of the connecting rod 4 through the limiting top seat 15, which can realize the rapid clamping of the piston and make the piston clamping more stable, thereby improving the processing accuracy of the piston.

[0033] In this embodiment, as shown in Figure 1, a transverse adjusting screw 7 is threaded through the two sides of the clamping seat 1 at the position corresponding to the arc-shaped limiting hoop 6. The transverse adjusting screw 7 is rotatably connected to the arc-shaped limiting hoop 6.

[0034] It should be noted that the lateral adjusting screw 7, under the action of the surface thread, pushes the arc-shaped limiting clamp 6 to abut against the surface of the piston ring 3, thereby clamping the piston ring 3.

[0035] In this embodiment, as shown in FIG4, the bottom of the clamping seat 1 is threadedly connected to a lifting adjustment screw 9, and the top of the lifting adjustment screw 9 is rotatably connected to the bottom support plate 8.

[0036] It should be noted that the lifting adjustment screw 9 can push the bottom support plate 8 to move up and down.

[0037] In this embodiment, as shown in FIG4, the bottom support plate 8 has an integrally formed limiting protrusion 10, and the bottom surface of the piston ring 3 is provided with a limiting groove 11, and the limiting protrusion 10 is inserted into the limiting groove 11.

[0038] It should be noted that the insertion of the limiting protrusion 10 into the limiting groove 11 can position the piston ring 3.

[0039] In this embodiment, as shown in FIG1, the upper pressure plate 12 has an integrally formed opening handle 13, and the opening handle 13 is threadedly connected to a connecting rod locking screw 14. The end of the connecting rod locking screw 14 is rotatably connected to a limiting top seat 15, and the limiting top seat 15 abuts against the surface of the connecting rod 4.

[0040] It should be noted that the opening handle 13 can easily open or close the upper pressure plate 12. After rotating the connecting rod locking screw 14, its end abuts against the two sides of the connecting rod 4 through the limiting top seat 15, which can realize the clamping and positioning of the connecting rod 4.

[0041] In this embodiment, as shown in FIG4, the lifting adjustment screw 9 is threadedly connected to a locking nut 16, which abuts against the lower surface of the clamping seat 1.

[0042] It should be noted that the locking nut 16 abuts against the lower surface of the clamping seat 1 to lock the lifting adjustment screw 9.

[0043] The working principle and usage process of this utility model are as follows: The piston ring 3 is inserted into the positioning groove on the clamping seat 1. The bottom of the piston ring 3 is inserted into the limiting protrusion 10 through the limiting groove 11, which can limit the piston ring 3. Rotating the lateral adjusting screw 7, the lateral adjusting screw 7 pushes the arc-shaped limiting clamp 6 against the surface of the piston ring 3 under the action of the surface thread. At the same time, the upper pressure plate 12 is opened and closed by the opening handle 13. After closing, the upper pressure plate 12 abuts against the upper surface of the piston ring 3, and the magnetic block 17 is magnetically attracted to the upper pressure plate 12 for fixation. The connecting rod locking screw 14 is rotated, and the end of the connecting rod locking screw 14 abuts against the two sides of the connecting rod 4 through the limiting top seat 15, which can realize the quick clamping of the piston and the more stable clamping of the piston, thereby improving the machining accuracy of the piston. The arc-shaped limiting clamp 6 can clamp piston rings 3 of different diameters. At the same time, the lifting adjustment screw 9 is rotated, and the lifting adjustment screw 9 pushes the bottom support plate 8 to rise and fall under the action of the surface thread, which can meet the positioning of piston rings 3 of different heights during use, and can meet the clamping and positioning of pistons of different models.

[0044] It should be understood that the above-described specific embodiments of this utility model are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims or their equivalents.

Claims

1. A positioning fixture for piston machining, comprising a clamping seat (1) and a fixing plate (2), wherein the fixing plate (2) is symmetrically welded to both sides of the clamping seat (1), characterized in that, The clamping seat (1) has a positioning groove on its surface. A piston ring (3) is movably inserted into the cavity of the positioning groove. A connecting rod (4) is rotatably connected to the piston ring (3). A bearing (5) is connected to the top of the connecting rod (4). A curved limiting hoop (6) is symmetrically provided in the cavity of the positioning groove. The inner wall of the curved limiting hoop (6) abuts against the surface of the piston ring (3). A bottom support plate (8) is movably provided at the bottom of the cavity of the positioning groove. The bottom support plate (8) abuts against the lower surface of the piston ring (3). An upper pressure plate (12) is rotatably connected to the surface of the clamping seat (1). After the upper pressure plate (12) is closed, it abuts against the upper surface of the piston ring (3). A clearance groove is provided on the surface of the upper pressure plate (12). The connecting rod (4) is inserted into the clearance groove. An adsorption magnetic block (17) is embedded in the surface of the clamping seat (1). The adsorption magnetic block (17) is magnetically attracted to the upper pressure plate (12).

2. The positioning fixture for piston machining according to claim 1, characterized in that, The clamping seat (1) has a transverse adjusting screw (7) threaded through the corresponding positions of the arc-shaped limiting hoop (6) on both sides of the surface. The transverse adjusting screw (7) is rotatably connected to the arc-shaped limiting hoop (6).

3. The positioning fixture for piston machining according to claim 2, characterized in that, The bottom of the clamping seat (1) is threadedly connected to a lifting adjustment screw (9), and the top of the lifting adjustment screw (9) is rotatably connected to the bottom support plate (8).

4. A positioning fixture for piston machining according to claim 3, characterized in that, The bottom support plate (8) has an integrally formed limiting protrusion (10) on its surface, and the piston ring (3) has a limiting groove (11) on its bottom surface. The limiting protrusion (10) is inserted into the limiting groove (11).

5. A positioning fixture for piston machining according to claim 4, characterized in that, The upper pressure plate (12) has an integrally formed opening handle (13) on its surface, and the opening handle (13) is threadedly connected to a connecting rod locking screw (14).

6. A positioning fixture for piston machining according to claim 5, characterized in that, The end of the connecting rod locking screw (14) is rotatably connected to a limiting top seat (15), which abuts against the surface of the connecting rod (4).

7. A positioning fixture for piston machining according to claim 6, characterized in that, The lifting adjustment screw (9) is threaded with a locking nut (16), which abuts against the lower surface of the clamping seat (1).

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