Clamp device for finish-milling valve pit of aluminum piston

Abstract

The invention belongs to the technical field of piston machining, and particularly relates to an aluminum piston finish-milling valve pit clamp device which comprises a middle shaft piece, the middle shaft piece is provided with a groove body and two first through holes distributed oppositely, and the first through holes communicate with the groove body and the outer portion of the middle shaft piece; the internal supporting piece is assembled in the groove body and comprises a long shaft moving in a reciprocating mode in the axial direction and side plates distributed on the two sides of the long shaft, the size of the long shaft is sequentially increased from the positioning end to the connecting end, springs are connected between the side plates and the side wall of the groove body, and pin shafts are connected to the side plates; the pin shaft penetrates through the first through hole and is in sliding fit with the first through hole in the radial direction. And an external clamping piece. According to the aluminum piston finish-milling valve pit clamp device in the technical scheme, the middle shaft piece is inserted into the notch of the piston to support the piston, the outer clamping piece clamps and fixes the piston, the pin shaft of the inner supporting piece is inserted into the pin hole to support and position the piston, and the clamp device is used for assisting in improving the rigidity of the piston; and the possibility of deformation of the piston in the machining process is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of piston processing, and in particular relates to a fixture device for precision milling valve pits of an aluminum piston. Background Art

[0002] The piston is an important mechanical component, widely used in internal combustion engines, compressors, hydraulic systems and other equipment. The piston is usually made of aluminum alloy or steel. The piston made of aluminum alloy is lightweight, has good thermal conductivity and cutting performance.

[0003] The piston valve pit is a concave structure on the top of the piston, usually located on both sides of the piston head. Its main function is to provide enough space for the movement of the valve to avoid collision between the valve and the piston at the top dead center. When processing the valve pit of the aluminum piston, since the piston is made of aluminum alloy, the rigidity is poor, and deformation is prone to occur during the processing. When processing the valve pit of the aluminum piston, the aluminum piston needs to be clamped. Therefore, in order to solve the problem of deformation of the valve pit of the aluminum piston, a fixture device for precision milling of the valve pit of the aluminum piston is designed. Summary of the invention

[0004] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0005] Aluminum piston precision milling valve pit fixture device, used in conjunction with a piston, the piston has a notch and two relatively distributed pin holes, the pin holes communicate with the notch and the outside of the piston, the fixture device includes

[0006] A central axis member, the central axis member having a groove body and two through holes one which are arranged opposite to each other, the through hole one communicating with the groove body and the outside of the central axis member;

[0007] An internal support member assembled inside the tank body, the internal support member comprising a long shaft reciprocating in the axial direction, and side plates distributed on both sides of the long shaft, the long shaft increasing in size from the positioning end to the connecting end, a spring connected between the side plate and the side wall of the tank body, a pin connected to the side plate, the pin passing through the through hole and slidingly cooperating with the through hole in the radial direction;

[0008] An external clamping member, the external clamping member comprises a plurality of side rods which are equidistantly distributed in an annular manner on the outside of the central shaft member, the upper ends of the side rods are connected with arc-shaped clamping plates, the plurality of arc-shaped clamping plates are in contact with each other to form a clamping cavity, and the plurality of arc-shaped clamping plates move away from or approach each other in a radial direction to drive the clamping cavity to open or close;

[0009] The piston is located inside the clamping cavity and sleeved on the positioning end of the central axis. The long axial positioning end moves the extrusion pin shaft to insert into the pin hole. The multiple arc-shaped clamping plates approach each other in the radial direction to drive the clamping cavity to close the clamping piston.

[0010] As a preference of the above technical solution, a side plate is radially outwardly extended from the fixed end of the central shaft member, the side rod is hinged to the side plate, and the side rod rotates around the hinge point to drive the arc-shaped clamping plates to move away from or close to each other in the radial direction to drive the clamping cavity to open or close.

[0011] As a preference of the above technical solution, a driving member is further included. The driving member includes an electric push rod assembled inside the groove body and axially distributed, and the output end of the electric push rod is connected to the long shaft through a first connecting rod.

[0012] As a preference of the above technical solution, a second through hole communicating the outside of the central shaft member with the groove body is provided on the central shaft member. The number of the second through holes is the same as that of the side rods, and the positions of the second through holes correspond to the side rods.

[0013] The driving member further includes a second connecting rod with the same number as the side rods. The second connecting rod passes through both ends of the second through hole and is respectively hinged and matched with the first connecting rod and the corresponding side rod.

[0014] As a preference of the above technical solution, the central shaft member further includes a bottom plate assembled with an external device. The bottom plate covers the opening of the groove body and is detachably connected to the side plate, and the electric push rod is assembled on the bottom plate.

[0015] As a preference of the above technical solution, a slider axially and slidably and sealingly cooperates with the groove body is further included. An air storage chamber is formed between the slider and the top wall of the groove body. An air bag is arranged on one side of the positioning end of the central shaft member. A third through hole communicating the air storage chamber with the air bag is provided on the central shaft member. Gases are filled in the air storage chamber and the air bag.

[0016] As a preference of the above technical solution, the driving member further includes a third connecting rod, and both ends of the third connecting rod are respectively connected to the long shaft and the slider.

[0017] As a preference of the above technical solution, a trapezoidal guiding section is provided on the pin shaft. The fixed end of the trapezoidal guiding section has the same size as the pin shaft, and the movable end size of the trapezoidal guiding section is smaller than the size of the pin shaft.

[0018] The beneficial effects of the present invention are as follows:

[0019] In the aluminum piston precision milling valve pit clamping device of the present technical solution, when the valve pit of the piston needs to be machined, the piston is placed inside the clamping cavity and sleeved on the positioning end of the central shaft member. The long shaft is controlled to move towards the positioning end to extrude the pin shaft into the pin hole, and multiple arc-shaped clamping plates move closer to each other in the radial direction to drive the clamping cavity to close to clamp the piston.

[0020] In the fixture device of this technical solution: 1. The central shaft part is inserted into the slot of the piston to support the piston, the external clamping part clamps and fixes the piston, and the pin shaft of the internal support part is inserted into the pin hole to support and position the piston, using the fixture device to assist in improving the rigidity of the piston and reducing the possibility of deformation of the piston during the processing;

[0021] 2. At the same time, when processing the piston, the impact force received by the piston is respectively transmitted to the central shaft part inside the piston, the internal support part inside the central shaft part, and the external clamping part outside the piston, and finally transmitted to the external equipment, ensuring uniform force on the piston and thus guaranteeing the processing effect of the piston;

[0022] 3. Combining the processing characteristics of the piston itself, the pin shaft is set to be inserted into the inside of the pin hole. While supporting the piston, it avoids the piston from moving in the circumferential direction and the up and down directions, avoiding misalignment and displacement during the processing, and ensuring the processing accuracy. Description of the Drawings

[0023] Figure 1 Fig. shows the structural schematic diagram of the fixture device for precision milling of valve pits of aluminum pistons in Embodiment 1;

[0024] Figure 2 Fig. shows the schematic diagram of the state of the fixture device for precision milling of valve pits of aluminum pistons in Embodiment 1 in cooperation with the piston;

[0025] Figure 3 Fig. shows the structural schematic diagram of the piston in Embodiment 1;

[0026] Figure 4 Fig. shows the structural schematic diagram of the central shaft part in Embodiment 1;

[0027] Figure 5 Fig. shows the top view schematic diagram of the state of the pin shaft in cooperation with the side plate in Embodiment 1.

[0028] Reference numerals: central shaft part 10; groove body 11; through hole one 12; through hole two 13; side plate 14; through hole three 15; bottom plate 16;

[0029] Internal support part 20; long shaft 21; pin shaft 22; trapezoidal guide section 221; side plate 23; spring 24;

[0030] External clamping part 30; side rod 31; arc-shaped clamping plate 32; clamping cavity 33;

[0031] Driving part 40; electric push rod 41; connecting rod one 42; connecting rod two 43; connecting rod three 44;

[0032] Slider 50; air storage chamber 60; airbag 70; piston 80; slot 81; pin hole 82. Detailed Embodiment

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0034] Embodiment 1

[0035] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 shown, an aluminum piston precision milling valve pit fixture device is used in cooperation with the piston 80. The piston 80 has a notch 81 and two relatively distributed pin holes 82. The pin holes 82 communicate the notch 81 with the outside of the piston 80. In this embodiment, the positioning end is the end for assembling the piston 80, and the connecting end is the end far from the piston 80.

[0036] The fixture device includes a central shaft member 10, which has a groove body 11 and two relatively distributed through holes one 12. The through holes one 12 communicate the groove body 11 with the outside of the central shaft member 10;

[0037] An internal support member 20 assembled inside the groove body 11. The internal support member 20 includes a long shaft 21 that reciprocates in the axial direction and side plates 23 distributed on both sides of the long shaft 21. The size of the long shaft 21 increases sequentially from the positioning end to the connecting end. A spring 24 is connected between the side plate 23 and the side wall of the groove body 11. A pin shaft 22 is connected to the side plate 23. The pin shaft 22 passes through the through hole one 12 and is in sliding fit with it in the radial direction; In the internal support member 20, when the long shaft 21 moves from the connecting end to the positioning end (from bottom to top), it touches the side plate 23 and drives the pin shaft 22 to move towards the outside of the central shaft member 10. At this time, the spring 24 is compressed. When the long shaft 21 moves from the positioning end to the connecting end (from top to bottom), under the action of the spring 24, the side plate 23 drives the pin shaft 22 to move towards the inside of the central shaft member 10;

[0038] An external clamping member 30. The external clamping member 30 includes a plurality of side rods 31 that are evenly distributed in an annular shape on the outside of the central shaft member 10. The upper end of the side rod 31 is connected with an arc-shaped clamping plate 32. A plurality of arc-shaped clamping plates 32 are in contact with each other and form a clamping cavity 33 therebetween. When the plurality of arc-shaped clamping plates 32 move away from each other in the radial direction, the clamping cavity 33 is opened. When the plurality of arc-shaped clamping plates 32 move closer to each other in the radial direction, the clamping cavity 33 is closed;

[0039] Among them, the piston 80 is located inside the clamping cavity 33 and sleeved on the positioning end of the central shaft member 10. When the long shaft 21 moves towards the positioning end, it squeezes the pin shaft 22 to insert into the pin hole 82, and the plurality of arc-shaped clamping plates 32 move closer to each other in the radial direction to drive the clamping cavity 33 to close and clamp the piston 80.

[0040] In the aluminum piston precision milling valve pit fixture device of this technical solution, when the valve pit of the piston 80 needs to be processed, the piston 80 is placed inside the clamping cavity 33 and sleeved on the positioning end of the central shaft member 10. The long shaft 21 is controlled to move towards the positioning end to squeeze the pin shaft 22 into the pin hole 82. A plurality of arc-shaped clamping plates 32 approach each other in the radial direction to drive the closing of the clamping cavity 33 to clamp the piston 80.

[0041] In the fixture device of this technical solution, 1. The central shaft member 10 is inserted into the notch 81 of the piston 80 to support the piston 80. The external clamping member 30 clamps and fixes the piston 80. The pin shaft 22 of the internal support member 20 is inserted into the pin hole 82 to support and position the piston 80. The fixture device is used to assist in improving the rigidity of the piston 80 and reducing the possibility of deformation of the piston 80 during the processing.

[0042] 2. At the same time, when the piston 80 is being processed, the impact force received by the piston 80 is respectively transmitted to the central shaft member 10 inside the piston 80, the internal support member 20 inside the central shaft member 10, and the external clamping member 30 outside the piston 80, and finally transmitted to the external device, ensuring uniform force on the piston 80 and thus guaranteeing the processing effect of the piston 80.

[0043] 3. Combining with the processing characteristics of the piston 80 itself, the pin shaft 22 is set to be inserted into the inside of the pin hole 82. While supporting the piston 80, it avoids the piston 80 from moving in the circumferential direction and the up and down directions, and avoids the occurrence of misalignment and displacement during the processing, ensuring the processing accuracy.

[0044] As Figure 1 、 Figure 2 shown, to solve the power problem of the entire device, the aluminum piston precision milling valve pit fixture device further includes a driving member 40. The driving member 40 includes an electric push rod 41 assembled inside the groove body 11 and axially distributed. The output end of the electric push rod 41 is connected to the long shaft 21 through a first connecting rod 42. As Figure 1 、 Figure 2 、 Figure 4 shown, the central shaft member 10 further includes a bottom plate 16 assembled with an external device. The bottom plate 16 covers the opening of the groove body 11 and is detachably connected to the side plate 14. The electric push rod 41 is assembled on the bottom plate 16. When the overall length of the electric push rod 41 increases, it drives the first connecting rod 42 and the long shaft 21 to move towards the positioning end (move upward). When the overall length of the electric push rod 41 shortens, it drives the first connecting rod 42 and the long shaft 21 to move towards the connecting end (move downward). The setting of the electric push rod 41 provides a power source for the reciprocating movement of the long shaft 21 in the axial direction.

[0045] To satisfy the movement paths of a plurality of arc-shaped clamping plates 32 moving away from or approaching each other in the radial direction, as Figure 1 、 Figure 2As shown, the fixed end of the central shaft member 10 extends radially outward to form a side plate 14. The side rod 31 is hinged to the side plate 14. The side rod 31 rotates around the hinge point, driving the arc-shaped clamping plates 32 to move away from each other in the radial direction, driving the clamping cavity 33 to open; the side rod 31 rotates around the hinge point, driving the arc-shaped clamping plates 32 to approach each other in the radial direction, driving the clamping cavity 33 to close.

[0046] As Figure 1 , Figure 2 , Figure 4 As shown, a second through hole 13 communicating the outside of the central shaft member 10 with the groove body 11 is provided on the central shaft member 10. The number of the second through holes 13 is the same as that of the side rods 31, and the positions of the second through holes 13 correspond to those of the side rods 31; the driving member 40 further includes a second connecting rod 43 with the same number as the side rods 31. The two ends of the second connecting rod 43 penetrate through the second through hole 13 and are respectively hinged and matched with the first connecting rod 42 and the corresponding side rod 31.

[0047] In the driving member 40 of this technical solution, when the electric push rod 41 drives the first connecting rod 42 to move towards the positioning end, one end of the second connecting rod 43 is driven to move upward. At this time, the linear distance between the side rod 31 and the first connecting rod 42 is shortened, and the side rod 31 rotates to drive the arc-shaped clamping plate 32 to move towards the central shaft member 10, and the clamping cavity 33 completes the closing action; the electric push rod 41 drives the first connecting rod 42 to move towards the connecting end. At this time, the linear distance between the side rod 31 and the first connecting rod 42 is increased, and the side rod 31 rotates to drive the arc-shaped clamping plate 32 to move away from the central shaft member 10, and the clamping cavity 33 completes the opening action. In the fixture device of this technical solution, the side rod 31 is hinged to the side plate 14, and the second connecting rod 43 is used to hinge and match the side rod 31 with the first connecting rod 42. When the long shaft 21 reciprocates in the axial direction, the clamping cavity 33 completes the opening or closing action, realizing mechanism linkage without separately adding a power source for it.

[0048] As Figure 1 , Figure 2 As shown, the aluminum piston precision milling valve pit fixture device further includes a slider 50 that is axially slidably and sealingly fitted with the groove body 11. A gas storage chamber 60 is formed between the slider 50 and the top wall of the groove body 11. An airbag 70 is provided on one side of the positioning end of the central shaft member 10. A third through hole 15 communicating the gas storage chamber 60 with the airbag 70 is provided on the central shaft member 10. The gas storage chamber 60 and the airbag 70 are filled with gas.

[0049] With the piston 80 positioned inside the clamping cavity 33 and sleeved on the positioning end of the central shaft member 10, as the long shaft 21 moves towards the positioning end to squeeze the pin shaft 22 into the pin hole 82, when the multiple arc-shaped clamping plates 32 approach each other in the radial direction to drive the closing of the clamping cavity 33 to clamp the piston 80, the slider 50 is controlled to move upward, squeezing the gas inside the air storage chamber 60 into the interior of the airbag 70. The airbag 70 expands to fill the gap between the central shaft member 10 and the notch 81, ensuring stable contact between the piston 80 and the central shaft member 10. When it is necessary to remove the piston 80 after completing the processing operation, the slider 50 is controlled to move downward, and the gas in the airbag 70 enters the interior of the air storage chamber 60.

[0050] As Figure 1 , Figure 2 shown, the driving member 40 further includes a third connecting rod 44. The two ends of the third connecting rod 44 are respectively connected to the long shaft 21 and the slider 50. When the electric push rod 41 drives the long shaft 21 to reciprocate in the axial direction, driving the side rod 31 to rotate to close or open the clamping cavity 33, the slider 50 is synchronously driven to reciprocate in the axial direction, realizing the need to squeeze the gas in the air storage chamber 60 into the interior of the airbag 70, or to let the gas in the airbag 70 enter the air storage chamber 60, providing a power source for the movement of the slider 50, realizing the linkage of the mechanism, and eliminating the need to separately add a power source.

[0051] As Figure 1 , Figure 2 , Figure 5 shown, a trapezoidal guiding section 221 is provided on the pin shaft 22. The fixed end of the trapezoidal guiding section 221 has the same size as the pin shaft 22, and the movable end of the trapezoidal guiding section 221 has a size smaller than that of the pin shaft 22; that is, with the movable end of the trapezoidal guiding section 221 being small and the fixed end being large, during the process of the trapezoidal guiding section 221 gradually inserting into the pin hole 82, the piston 80 is gradually driven to displace circumferentially, correcting the position of the piston 80 on the central shaft member 10, improving the position error between the pin shaft 22 and the pin hole 82, and reducing the precision requirements for sleeving the piston 80 on the central shaft member 10.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. Aluminum piston precision milling valve pit fixture device, used in cooperation with piston (80), the piston (80) has a notch (81) and two relatively distributed pin holes (82), the pin holes (82) communicate the notch (81) with the outside of the piston (80), and is characterized in that, The fixture device includes a central shaft member (10), the central shaft member (10) having a groove body (11) and two through holes one (12) distributed relatively, the through holes one (12) communicating the groove body (11) with the outside of the central shaft member (10); an internal support member (20) assembled inside the groove body (11), the internal support member (20) including a long shaft (21) reciprocatingly moving in the axial direction and side plates (23) distributed on both sides of the long shaft (21), the long shaft (21) increasing in size sequentially from the positioning end to the connection end, a spring (24) being connected between the side plates (23) and the side wall of the groove body (11), a pin shaft (22) being connected to the side plates (23), the pin shaft (22) passing through the through hole one (12) and being in sliding fit therewith in the radial direction; an external clamping member (30), the external clamping member (30) including side rods (31) that are multiple in number and annularly distributed equidistantly outside the central shaft member (10), an arc-shaped clamping plate (32) being connected to the upper end of the side rods (31), the multiple arc-shaped clamping plates (32) abutting against each other to form a clamping cavity (33), the multiple arc-shaped clamping plates (32) moving away from or approaching each other in the radial direction to drive the clamping cavity (33) to open or close; wherein, the piston (80) is located inside the clamping cavity (33) and sleeved on the positioning end of the central shaft member (10), the long shaft (21) moving towards the positioning end to squeeze the pin shaft (22) into the pin hole (82), the multiple arc-shaped clamping plates (32) moving closer to each other in the radial direction to drive the clamping cavity (33) to close and clamp the piston (80).

2. The aluminum piston precision milling valve pit fixture device according to claim 1, wherein A side plate (14) extends radially outwards from the fixed end of the central shaft member (10), the side rod (31) is hinged to the side plate (14), and the side rod (31) rotates around the hinge point to drive the arc-shaped clamping plate (32) to move away from or approach each other in the radial direction to drive the clamping cavity (33) to open or close.

3. The aluminum piston precision milling valve pit fixture device according to claim 2, characterized in that, It further includes a driving member (40), the driving member (40) including an electric push rod (41) assembled inside the groove body (11) and axially distributed, an output end of the electric push rod (41) being connected to the long shaft (21) through a connecting rod one (42).

4. The aluminum piston precision milling valve pit fixture device according to claim 3, characterized in that A through hole two (13) communicating the outside of the central shaft member (10) with the groove body (11) is formed on the central shaft member (10), the number of the through holes two (13) is the same as that of the side rods (31), and the positions of the through holes two (13) correspond to the side rods (31); The driving member (40) further includes connecting rods two (43) that are the same in number as the side rods (31), the connecting rods two (43) passing through the through hole two (13) and being respectively hingedly fitted with the connecting rod one (42) and the corresponding side rod (31) at both ends.

5. The aluminum piston fine milling valve pit fixture device according to claim 3, characterized in that, The central shaft member (10) further includes a bottom plate (16) assembled with an external device, the bottom plate (16) covering the opening of the groove body (11) and being detachably connected to the side plate (14), and the electric push rod (41) is assembled on the bottom plate (16).

6. The aluminum piston precision milling valve pit fixture device according to claim 3, characterized in that It further includes a slider (50) which is axially and slidably and sealingly engaged with the groove body (11). A gas storage chamber (60) is formed between the slider (50) and the top wall of the groove body (11). An airbag (70) is arranged on one side of the positioning end of the central shaft member (10). A third through hole (15) communicating the gas storage chamber (60) with the airbag (70) is arranged on the central shaft member (10). Gases are filled in the gas storage chamber (60) and the airbag (70).

7. The aluminum piston precision milling valve pit fixture device according to claim 6, characterized in that, The driving member (40) further includes a third connecting rod (44). Two ends of the third connecting rod (44) are respectively connected to the long shaft (21) and the slider (50).

8. The aluminum piston precision milling valve pit fixture device according to claim 1, characterized in that, A trapezoidal guiding section (221) is arranged on the pin shaft (22). The fixed end of the trapezoidal guiding section (221) has the same size as the pin shaft (22), and the movable end of the trapezoidal guiding section (221) has a size smaller than that of the pin shaft (22).

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