Positioning clamp for piston pin hole machining

Abstract

The utility model provides a positioning fixture for processing a piston pin hole, and relates to the field of piston fixtures, the positioning fixture for processing the piston pin hole comprises an operation table and two groups of fixture fixing devices, through the cooperative work of a downward pressing component, a side pressing component and a tightening component, a workpiece can be stably clamped from multiple directions, and the clamping efficiency is improved. The downward pressing component can precisely control the downward pressing force and position through a driving rod, an adjusting assembly and other fine structures, it is ensured that a workpiece is fixed in the vertical direction, a driven rack of the side pressing component is meshed with an adjusting piece, the side face pressure can be flexibly adjusted according to the size of the workpiece, precise side face positioning is achieved, and the stability of the workpiece during piston pin hole machining is greatly improved; according to the positioning clamp, the machining error is effectively reduced, the machining precision is guaranteed, then the machining efficiency and the product quality are improved, the positioning clamp can adapt to piston workpieces of different sizes, the cost and time consumption for frequently replacing the clamp due to different sizes are reduced, and the universality of equipment and the production flexibility are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of piston clamp, especially a positioning fixture for piston pin hole machining. BACKGROUND

[0002] In the piston pin hole machining process, the positioning fixture can ensure the accurate fixing of the position of the piston in the machining equipment (such as a drilling machine, a boring machine, etc.), and the position precision of the pin hole of the piston is very high because it is directly related to the matching precision of the piston and the piston pin. For example, for an engine piston, the parallelism error between the center of the pin hole and the center line of the piston usually needs to be controlled within a very small range (generally within a few tens of microns). The positioning fixture accurately positions the piston at the required position for machining by closely cooperating with the reference surfaces such as the outer cylindrical surface and the end surface of the piston, ensuring that the position of the pin hole machined each time is consistent with the position of other parts of the piston, thereby ensuring the correct installation and movement of the piston in the engine.

[0003] In the prior art, the fixing method for the workpiece is often single, and lacks a multi-directional cooperative fixing mechanism. Most of them only rely on simple clamping devices, which are difficult to accurately and stably position the workpiece in the vertical and horizontal directions at the same time. This leads to displacement or shaking of the workpiece during machining due to external forces such as cutting force, which greatly increases the machining error. Taking the machining of the piston pin hole of an automobile engine as an example, if the machining error exceeds the allowable range, the matching precision between the piston and the pin hole will be affected, which may cause serious problems such as power reduction, increased oil consumption, and even abnormal wear of the engine.

[0004] The existing positioning fixture has serious defects in adapting to different sizes of piston workpieces. Its structure is usually fixed and difficult to flexibly adjust the distance between the two sets of fixed clamping devices, which means that enterprises have to frequently replace the clamps when machining pistons of different sizes. Each time the clamp is replaced, a lot of time is spent on disassembly, installation and debugging, which seriously affects production efficiency. At the same time, frequent purchase of clamps of different specifications greatly increases the production cost of enterprises and reduces the versatility of equipment and the flexibility of production.

[0005] Therefore, it is necessary to provide a new positioning fixture for piston pin hole machining to solve the above technical problems. SUMMARY

[0006] To solve the above technical problems, the utility model provides a positioning fixture for piston pin hole machining.

[0007] The utility model provides a kind of locating fixture for piston pin hole processing, it includes: operating platform and two groups of fixed clamp device, two groups The fixed clamp device is mutually opposite and is set, the operating platform inside is equipped with rotating rod, rotating rod two ends are respectively penetrated The surface of both sides of the operating platform and extend to the outside of the operating platform, the operating platform top surface is equipped with The sliding slot that two groups of the fixed clamp device move, two groups The fixed clamp device bottom is respectively sleeved on the surface of rotating rod And slidingly located in the sliding slot inside;

[0008] The fixed clamp device includes a carrier, a lower pressing member, a tightening member, and two side pressing members. The carrier bottom end is sleeved on the surface of the rotating rod. The lower pressing member top end is fixedly connected with the lower pressing member bottom end. The carrier inside is penetrated to be equipped with the adjusting slot for the movement of two side pressing members. Two side pressing members are mutually symmetrical and opposite and set, and the end of two side pressing members mutually adjacent is slidingly located in the adjusting slot inside. Two side pressing members are rotated and followed by sliding through the adjustment piece. The tightening member bottom end is fixedly connected with the operating platform top end. The top end of the lower pressing member is connected with the inside surface of the tightening member through the pull rope.

[0009] Preferably, the lower pressing member includes a driving rod, a rotating piece, an adjustment assembly, and two lower pressing pieces. The driving rod bottom end is rotationally connected with the inside of the rotating piece. The adjustment assembly is sleeved on the outside surface of the driving rod. Two lower pressing pieces are respectively rotationally installed on both sides of the adjustment assembly. The driving rod bottom end inside is detachably provided with a limiting piece. The limiting piece two ends are respectively penetrated in the inside of two lower pressing pieces. The middle surface of the driving rod is provided with a rotating thread. The middle surface of the driving rod mutually opposite is provided with a displacement slot for the sliding of the adjustment assembly.

[0010] Preferably, the adjustment assembly includes an adjusting piece and a driven piece. The adjusting piece is threadedly sleeved on the outside surface of the driving rod. The driven piece inside is provided with a rotating groove. The adjusting piece one end is rotationally located in the rotating groove inside. Two mutually opposite sliding blocks are fixedly arranged in the inside of the driven piece. Two sliding blocks are respectively located in two displacement slots. Two lower pressing pieces are respectively installed on both sides of the outside of the driven piece.

[0011] Preferably, the side pressing member includes a limiting plate and a driven rack. The limiting plate one side is fixedly connected with the driven rack one end. The driven rack is slidingly located in the adjusting slot inside. The end of the driven rack adjacent to the adjustment piece is engaged with the outside surface of the adjustment piece.

[0012] Preferably, the tightening member comprises a limiting part, an anti-off part and a tightening part, the bottom end of the limiting part is fixedly connected with the top end of the operation table, the two ends of the tightening part are respectively penetrated through the two ends of the limiting part and are rotationally connected, one end of the tightening part is fixedly provided with a crank handle, the other end of the tightening part is fixedly provided with a limiting ratchet, the limiting ratchet and the anti-off part are located on the same side of the limiting part, and the outer surface of the anti-off part is engaged with the outer side of the limiting ratchet.

[0013] Preferably, one end of the adjusting part is penetrated through the back surface of the bearing body and extends into the adjusting groove, and the end of the adjusting part extending into the adjusting groove is a rotating gear and is engaged with the driven rack, the top end of the driving rod is fixedly provided with a connecting ring, and the connecting ring is in detachable connection with the drawstring.

[0014] Compared with the related art, the positioning clamp for piston pin hole machining has the following beneficial effects:

[0015] When the positioning clamp is used for machining and fixing, the workpiece can be stably clamped from multiple directions through the cooperative work of the downward pressing member, the side pressing member and the tightening member, the downward pressing force and position can be accurately controlled through the fine structure such as the driving rod and the adjusting assembly, so that the workpiece is fixed in the vertical direction; the driven rack of the side pressing member is engaged with the adjusting part, the side pressing force can be flexibly adjusted according to the size of the workpiece, accurate side positioning is realized, the stability of the workpiece during piston pin hole machining is greatly improved, machining errors are effectively reduced, machining precision is ensured, machining efficiency and product quality are improved, the positioning clamp can adapt to piston workpieces of different sizes, the application range of the clamp is greatly expanded, the cost and time consumption of enterprises for frequently replacing clamps due to machining of workpieces of different sizes are reduced, and the universality of the equipment and the flexibility of production are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an overall structural schematic view of the positioning clamp for piston pin hole machining provided by the utility model;

[0017] Figure 2 It is an overall structural schematic view of the positioning clamp for piston pin hole machining provided by the utility model;

[0018] Figure 3 It is a local split structural schematic view of the positioning clamp for piston pin hole machining provided by the utility model;

[0019] Figure 4 It is a local split structural schematic view of the positioning clamp for piston pin hole machining provided by the utility model;

[0020] Figure 5 It is an overall structural schematic view of the positioning clamp for piston pin hole machining provided by the utility model;

[0021] Figure 6 The overall structure schematic diagram of the bearing body provided by the utility model is shown in the figure;

[0022] Figure 7 The split structure schematic diagram of the lateral pressure component provided by the utility model is shown in the figure;

[0023] Figure 8 The split structure schematic diagram of the tightening component provided by the utility model is shown in the figure.

[0024] Reference signs in the figure: 1, operation table; 2, rotating rod; 3, sliding groove; 4, bearing body; 5, adjusting groove; 6, adjusting piece; 7, drawstring; 8, driving rod; 9, rotating piece; 10, pressing piece; 11, displacement groove; 12, adjusting piece; 13, driven piece; 14, rotating groove; 15, sliding block; 16, limiting plate; 17, driven rack; 18, limiting component; 19, anti-dropping piece; 20, tightening piece; 21, crank; 22, limiting ratchet; 23, rotating gear; 24, connecting ring; 25, limiting piece. DETAILED DESCRIPTION

[0025] The utility model will be further described below in combination with the drawings and embodiments.

[0026] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , among which, Figure 1 The overall structure schematic diagram of the positioning clamp for piston pin hole machining provided by the utility model is shown in the figure; Figure 2 The overall structure schematic diagram of the fixed clamp device provided by the utility model is shown in the figure; Figure 3 The partial split structure schematic diagram of the fixed clamp device provided by the utility model is shown in the figure; Figure 4 The partial split structure schematic diagram of the fixed clamp device provided by the utility model is shown in the figure; Figure 5 The overall structure schematic diagram of the bearing body and the lateral pressure component provided by the utility model is shown in the figure; Figure 6 The overall structure schematic diagram of the bearing body provided by the utility model is shown in the figure; Figure 7 The split structure schematic diagram of the lateral pressure component provided by the utility model is shown in the figure; Figure 8 The split structure schematic diagram of the tightening component provided by the utility model is shown in the figure.

[0027] In the specific implementation process, such as Figures 1-8As shown, the utility model provides a kind of positioning fixture for piston pin hole processing, including operation platform 1 and two groups of fixed clamp device, two groups of fixed clamp device are mutually opposite setting, rotating rod 2 is equipped in operation platform 1 inside, rotating rod 2 two ends are respectively through operation platform 1 two side surfaces and extend to operation platform 1 outside, the top surface of operation platform 1 is provided with a sliding groove 3 for the activity of two groups of fixed clamp device, and the bottom of two groups of fixed clamp device is respectively sleeved on the surface of rotating rod 2 and is slid in the inside of sliding groove 3;

[0028] Fixed clamp device includes carrier 4, lower pressure component, tightening component and two side pressure components, carrier 4 bottom end is sleeved on the surface of rotating rod 2, lower pressure component top end is fixedly connected with lower pressure component bottom end, adjusting groove 5 for the activity of two side pressure components is passed in the inside of carrier 4, two side pressure components are mutually symmetrical and opposite setting, and the end of two side pressure components mutually adjacent is slid in the inside of adjusting groove 5, and two side pressure components are slid by adjusting piece 6 rotation, and tightening component bottom end is fixedly connected with the top end of operation platform 1, and the top end of lower pressure component is connected with the inside surface of tightening component by pulling knot rope 7;

[0029] In one specific embodiment, the top end of driving rod 8 is fixedly provided with connecting ring 24, and the connecting ring 24 is detachably connected with the pulling knot rope 7.

[0030] In one specific embodiment, the one end of adjusting piece 12 is passed through the back surface of carrier 4 and extends to the inside of adjusting groove 5, and the one end of adjusting piece 12 extending to the inside of adjusting groove 5 is a rotating gear 23, and is engaged with driven rack 17.

[0031] Lower pressure component includes driving rod 8, rotating part 9, adjusting assembly and two lower pressure pieces 10, driving rod 8 bottom end is rotationally connected with the inside of rotating part 9, adjusting assembly is sleeved on the outside surface of driving rod 8, two lower pressure pieces 10 are rotationally installed on the two sides of adjusting assembly, limit piece 25 is detachably arranged in the inside of driving rod 8 bottom end, limit piece 25 two ends are respectively passed through the inside of two lower pressure pieces 10, rotating screw is arranged on the middle surface of driving rod 8, and displacement slot 11 for the sliding of adjusting assembly is formed on the mutually opposite middle surface of driving rod 8.

[0032] Adjusting assembly includes adjusting piece 12 and driven part 13, adjusting piece 12 is threadedly sleeved on the outside surface of driving rod 8, rotating groove 14 is formed in the inside of driven part 13, one end of adjusting piece 12 is rotationally located in the inside of rotating groove 14, and two mutually opposite sliding blocks 15 are fixedly arranged in the inside of driven part 13, two sliding blocks 15 are respectively located in two displacement slots 11, and two lower pressure pieces 10 are respectively installed on the two sides of the outside of driven part 13.

[0033] The side pressing member comprises a limiting plate 16 and a driven rack 17, one side of the limiting plate 16 is fixedly connected with one end of the driven rack 17, the driven rack 17 is slidably arranged in the adjusting groove 5, and one end of the driven rack 17 is engaged with the outer surface of the adjusting member 6.

[0034] The tightening member comprises a limiting part 18, an anti-off part 19 and a tightening part 20, the bottom end of the limiting plate 16 is fixedly connected with the top end of the operation table 1, the two ends of the tightening part 20 are respectively penetrated through the two ends of the limiting part 18 and are rotationally connected, one end of the tightening part 20 is fixedly provided with a crank 21, the other end of the tightening part 20 is fixedly provided with a limiting ratchet 22, the limiting ratchet 22 and the anti-off part 19 are located on the same side of the limiting part 18, and the outer surface of the anti-off part 19 is engaged with the outer side of the limiting ratchet 22.

[0035] The working principle of the utility model is as follows:

[0036] When the positioning clamp is used for machining and fixing, the distance between the two sets of fixed clamp devices is adjusted through the rotating rod 2, the workpiece is placed on the carrier 4, the driving rod 8 is rotated, the lower pressing member is pressed down, at the same time, the adjusting member 12 is rotated to drive the side pressing member to clamp the workpiece from the side, then the crank 21 of the tightening member is rotated, the pressing degree of the lower pressing member is further adjusted through the connecting rope 7, the workpiece is firmly and accurately positioned, and the piston pin hole machining is realized.

[0037] The above is only an embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation according to the content of the utility model specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the utility model.

Claims

1. A positioning fixture for machining piston pin holes, characterized in that, Include: The operating platform (1) and two groups of fixed clamp device, two groups of the fixed clamp device is opposite, the operating platform (1) inside is equipped with rotating rod (2), the rotating rod (2) both ends respectively through the operating platform (1) both sides surface and extends to the operating platform (1) outside, the operating platform (1) top surface is provided with a group of the fixed clamp device activity sliding slot (3), two groups of the fixed clamp device bottom respectively set in the rotating rod (2) surface and slide in the sliding slot (3) inside; The fixed clamp device includes carrier (4), lower pressure component, tightening component and two side pressure components, the carrier (4) bottom end set in the rotating rod (2) surface, the lower pressure component top end and the lower pressure component bottom end are fixedly connected, the carrier (4) inside is provided with two adjusting grooves (5) for two side pressure components, two side pressure components are symmetrical and opposite, and two side pressure components are adjacent to each other one end are located in the adjusting groove (5) inside, and two side pressure components are connected through adjustment piece (6) rotation and follow sliding, the tightening component bottom end and the operating platform (1) top end are fixedly connected, the top end of the lower pressure component is connected with the inside surface of the tightening component through the pull rope (7).

2. The positioning jig for machining a piston pin hole according to claim 1, characterized by The lower pressure component includes drive rod (8), rotating piece (9), adjustment assembly and two lower pressure components (10), the drive rod (8) bottom end is rotatably connected with the inside of the rotating piece (9), the adjustment assembly is set on the outside surface of the drive rod (8), two lower pressure components (10) are rotatably installed on both sides of the adjustment assembly, the inside of the drive rod (8) bottom end is detachably provided with a limiting piece (25), the limiting piece (25) both ends are respectively located in the inside of two lower pressure components (10), the middle surface of the drive rod (8) is provided with a rotating thread, and the middle surface of the drive rod (8) is opposite and provided with a displacement groove (11) for the sliding of the adjustment assembly.

3. The positioning jig for machining a piston pin hole according to claim 2, characterized by The adjustment assembly includes adjustment piece (12) and driven piece (13), the adjustment piece (12) is threadedly set on the outside surface of the drive rod (8), the inside of the driven piece (13) is provided with a rotating groove (14), one end of the adjustment piece (12) is rotatably located in the rotating groove (14), and the inside of the driven piece (13) is fixedly provided with two opposite sliding blocks (15), two sliding blocks (15) are respectively located in two displacement grooves (11), and two lower pressure components (10) are respectively installed on the outside of the driven piece (13).

4. The positioning jig for machining a piston pin hole according to claim 3, characterized by The side pressure component includes limiting plate (16) and driven rack (17), one side of the limiting plate (16) is fixedly connected with one end of the driven rack (17), the driven rack (17) is slidably located in the adjusting groove (5), and one end of the driven rack (17) adjacent to the adjustment piece (6) is engaged with the outside surface of the adjustment piece (6).

5. The positioning jig for machining a piston pin hole according to claim 4, characterized by The tightening member comprises a limiting part (18), an anti-off part (19) and a tightening part (20), the bottom end of the limiting plate (16) is fixedly connected with the top end of the operating table (1), the two ends of the tightening part (20) are respectively penetrated through the two ends of the limiting part (18) and are rotationally connected, one end of the tightening part (20) is fixedly provided with a crank (21), the other end of the tightening part (20) is fixedly provided with a limiting ratchet (22), the limiting ratchet (22) and the anti-off part (19) are located on the same side of the limiting part (18), and the outer surface of the anti-off part (19) is engaged with the outer side of the limiting ratchet (22).

6. The positioning jig for machining a piston pin hole according to claim 5, characterized by One end of the adjusting part (12) penetrates through the back surface of the bearing body (4) and extends into the adjusting groove (5), one end of the adjusting part (12) extending into the adjusting groove (5) is a rotating gear (23) and is engaged with the driven rack (17), the top end of the driving rod (8) is fixedly provided with a connecting ring (24), and the connecting ring (24) is detachably connected with the drawstring (7).

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