Milling clamp for boss of connecting rod cap of engine

Abstract

The invention discloses a milling clamp for a boss of an engine connecting rod cover. The milling clamp comprises a bottom plate, a vertical plate, an oil cylinder assembly used for clamping a workpiece front and back, an upper jacking assembly used for jacking the top of the workpiece, a side jacking assembly used for jacking one side of the workpiece, a side oil cylinder jacking assembly used for jacking the other side of the workpiece and a lower oil cylinder jacking assembly used for jacking the bottom of the workpiece. The upper end of the bottom plate is fixedly connected with an oil passing rib plate and an oil path block; the oil path block, the bottom plate, the oil passing rib plate and the vertical plate are each provided with an oil path. An external oil pipe is connected with the oil path block and then sequentially communicated with the bottom plate and the oil passing rib plate to be communicated with the oil path of the vertical plate, and the oil path on the vertical plate is communicated with the oil path of the lower oil cylinder jacking assembly and the oil path of the side oil cylinder jacking assembly. The multi-station milling machine has the advantages that a plurality of milling stations are arranged, the machining efficiency is high, a built-in integrated oil way is arranged, and many adverse effects of complex external oil pipes on station cleaning, disassembly and maintenance, cutting tool movement and the like are completely eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of fixtures for machining engine connecting rods, and in particular to a fixture for milling a boss of an engine connecting rod cover. Background Art

[0002] The engine connecting rod is a key mechanical component in the internal combustion engine. The main function of the connecting rod is to connect the piston and the crankshaft, converting the linear reciprocating motion of the piston into the rotational motion of the crankshaft. The machining accuracy of the connecting rod directly affects the performance, durability, vibration and noise level of the engine, as well as the frequency of repair and maintenance. Therefore, ensuring the high-precision machining of the connecting rod is an important part of ensuring reliable operation and high efficiency of the engine.

[0003] The engine connecting rod includes a rod body and a connecting rod cover. The milling accuracy of the connecting rod cover boss directly affects the fit between the connecting rod cover, the connecting rod and the crankshaft. Poor fit will lead to power loss, increased vibration and increased wear. Due to the complex shape of the connecting rod cover, in order to ensure milling accuracy, a special fixture is required to fix the workpiece to prevent the workpiece from moving or deforming during processing. In order to improve processing efficiency, multi-station fixtures are often used, and due to the complex shape of the connecting rod cover, even a single station needs to be clamped in three directions: up, down, front, back, left and right. Therefore, a multi-station fixture requires a large number of clamping components. Most of the current clamping components use hydraulic cylinders, and each standard hydraulic cylinder is connected to two external oil pipes, resulting in a large number of external oil pipes that need to be connected to the multi-station fixture. This results in complex oil pipe wiring for the fixture, which is inconvenient for cleaning, disassembly and maintenance of the station, and the complex oil pipes will interfere with the movement of the cutting tool, affecting processing. Summary of the invention

[0004] The technical problem to be solved by the invention is to provide a milling fixture for the boss of an engine connecting rod cover.

[0005] In order to solve the above technical problems, the technical solution of the invention is a milling fixture for the boss of an engine connecting rod cover, comprising a base plate and a vertical plate installed on the base plate; the vertical plate is provided with a plurality of cylinder assemblies for clamping the workpiece front and rear, an upper tightening assembly for supporting the top of the workpiece, a side tightening assembly for tightening one side of the workpiece, a side cylinder tightening assembly for tightening the other side of the workpiece, and a lower cylinder tightening assembly for tightening the bottom of the workpiece; an oil-passing rib plate and an oil circuit block are fixedly connected to the upper end of the base plate; oil circuits are provided on the oil circuit block, the base plate, the oil-passing rib plate and the vertical plate; an external oil pipe is connected to the oil circuit block, and then connected to the base plate, the oil-passing rib plate and the oil circuit of the vertical plate in sequence, and the oil circuits on the vertical plate are respectively connected to the oil circuits of the lower cylinder tightening assembly and the side cylinder tightening assembly.

[0006] Furthermore, the lower oil cylinder tightening assembly includes a cylinder body, a lower oil cylinder piston movably installed in the inner cavity of the cylinder body and a lower oil cylinder push rod; the lower oil cylinder piston and the lower oil cylinder push rod are vertically arranged; the inner cavity of the cylinder body is provided with an annular groove for installing a second spring gasket, and the upper part of the second spring gasket is fixedly connected to a second spring pad; the two ends of the second spring are respectively connected to the second spring pad and the bottom of the lower oil cylinder push rod; the bottom of the lower oil cylinder piston is provided with a groove, and the center of the groove bottom is provided with a blind hole; the lower oil cylinder piston is integrally connected with a piston part that is slidably connected to the inner wall of the cylinder body; the top of the lower oil cylinder piston is provided with an inclined protrusion; one side of the lower oil cylinder push rod is provided with a sliding groove that is slidably connected to the protrusion; the protruding part of the lower oil cylinder push rod extending out of the cylinder body passes through the lower oil cylinder top plate and is locked by a locking nut; screws are installed on both sides of the lower oil cylinder top plate.

[0007] Furthermore, a limit hole is provided on the outer wall of the cylinder body; a waist-shaped hole is provided at a corresponding position of the lower oil cylinder top rod; and a limit screw for limiting the movement of the lower oil cylinder top rod is installed on the limit hole.

[0008] Furthermore, the side oil cylinder tightening assembly comprises a side oil cylinder bottom plate mounted on the bottom plate, and a side oil cylinder body mounted on the side oil cylinder bottom plate; a side oil cylinder piston and a side oil cylinder top rod are movably mounted in the inner cavity of the side oil cylinder body; the side oil cylinder piston and the side oil cylinder top rod are vertically arranged; a piston portion which is slidably connected to the inner wall of the side oil cylinder is integrally connected to the side oil cylinder piston; an inclined convex block is arranged on the top of the side oil cylinder piston, and a sliding groove which is slidably connected to the convex block is arranged on the side wall of the side oil cylinder top rod; a side oil cylinder rear cover is fixedly mounted on the inner cavity of the side oil cylinder body at the bottom of the side oil cylinder piston; The inner cavity of the cylinder body is provided with an annular groove for installing the first spring gasket, and the first spring gasket is fixedly connected to the inside of the first spring gasket; the two ends of the first spring are respectively connected to the first spring gasket and the bottom of the side cylinder top rod; a limit ring for limiting the movement of the side cylinder top rod is fixedly installed at one end of the side cylinder body; a side top screw is installed at one end of the side cylinder top rod; a side top nut is installed on the side top screw; an oil inlet hole is provided on the side wall of the chamber of the side cylinder body; a connecting oil path connecting the vertical plate and the oil inlet hole is provided on the side cylinder bottom plate; a blind hole is provided at the bottom of the side cylinder piston.

[0009] Furthermore, a third spring is installed between the piston portion of the lower oil cylinder piston and the side wall of the internal chamber of the cylinder body; a fourth spring is installed between the piston portion of the side oil cylinder piston and the side wall of the internal chamber of the side oil cylinder body.

[0010] Furthermore, the upper tightening assembly includes a top plate mounting plate fixedly mounted on the vertical plate, and a top plate is fixed on the top of the top plate mounting plate.

[0011] Furthermore, a backing plate is installed on the surface of the top plate mounting plate; the first rib plate and the second rib plate are fixedly connected to the upper end of the bottom plate; and the vertical plate is fixedly connected to one side of the first rib plate, the second rib plate and the oil-passing rib plate.

[0012] Furthermore, the side tightening assembly includes a side positioning seat fixedly mounted on the vertical plate; a screw rod is mounted on the side positioning seat; and a nut is mounted on the screw rod.

[0013] Furthermore, the oil cylinder assembly includes a plurality of oil cylinders; a pressure plate is fixedly mounted on one end of the piston rod of the oil cylinder; a pressure head is mounted on one side of the pressure plates located on both sides; and a pressure head is mounted on one side of the remaining pressure plates.

[0014] Furthermore, a pad rod is fixedly connected to the side of the pressure plate located on both sides where the pressure head is not installed; the pad rod includes a screw rod fixedly connected to the pressure head and a hexagonal rod installed on the screw rod; the hole for installing the pressure head opened on the pressure plate is a strip hole, and a bolt is inserted into the strip hole and locked with the pressure head.

[0015] Furthermore, the tops of the first ribs and the oil-passing ribs on both sides are installed with lifting rings.

[0016] Beneficial effects of the invention:

[0017] (1) The present application is provided with multiple milling stations, which can effectively improve the processing efficiency compared with a single station; each station is provided with a cylinder assembly for clamping the workpiece front and back, an upper clamping assembly for supporting the top of the workpiece, a side clamping assembly for supporting one side of the workpiece, a side cylinder clamping assembly for supporting the other side of the workpiece, and a lower cylinder clamping assembly for supporting the bottom of the workpiece. The clamping effect is good, which can effectively prevent the workpiece from moving, and the clamping force on the workpiece is uniform, which will not cause deformation of the parts;

[0018] (2) The upper end of the base plate of the present application is fixedly connected with an oil-passing rib plate and an oil circuit block; the oil circuit block, base plate, oil-passing rib plate and vertical plate are all provided with oil circuits; the external oil pipe is connected to the oil circuit block, and then sequentially connects the base plate, the oil-passing rib plate to the oil circuit of the vertical plate, and the oil circuit on the vertical plate is respectively connected to the oil circuits of the lower oil cylinder tightening assembly and the side oil cylinder tightening assembly. The present invention is aimed at the complex multi-station connecting rod cover boss milling fixture, and sets a built-in integrated oil circuit, which completely eliminates the many adverse effects of the complex external oil pipe on station cleaning, disassembly and maintenance, and cutting tool movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0020] Figure 2 for Figure 1 Right view of;

[0021] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the middle and lower oil cylinder tightening assembly;

[0022] Figure 4 This is a schematic diagram of the internal structure when the lower oil cylinder tightening assembly is installed on the vertical plate;

[0023] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure of the piston of the middle and lower oil cylinder;

[0024] Figure 6 for Figure 4 A cross-sectional view of the piston of the middle and lower cylinders;

[0025] Figure 7 for Figure 4 The front view of the middle and lower cylinder push rod;

[0026] Figure 8 for Figure 7 Rear view of the middle and lower cylinder push rod;

[0027] Fig. 9 for Figure 7 A cross-sectional view of the middle and lower cylinder top rod;

[0028] Fig.10 for Figure 1 A three-dimensional structural diagram of the side oil cylinder tightening assembly;

[0029] Fig.11 for Fig.10 A cross-sectional view of the middle side oil cylinder tightening assembly in one direction;

[0030] Fig.12 for Fig.10 A cross-sectional view of the middle side oil cylinder tightening assembly from another direction;

[0031] Fig.13 for Fig.10 Top view of the middle side cylinder bottom plate;

[0032] Fig.14 for Fig.13 A cross-sectional view of

[0033] Fig.15 for Figure 1 Side view of the oil rib plate;

[0034] Fig.16 for Figure 1 The front view of the oil rib plate;

[0035] Fig.17 A schematic diagram of the connection of one of the oil passages between the bottom plate, the oil-passing rib plate and the vertical plate in the embodiment;

[0036] Fig.18Schematic diagram of the connection of another oil path between the bottom plate, the oil-passing rib plate and the vertical plate in the embodiment;

[0037] Fig.19 A perspective view of the oil path arrangement of the vertical plate in the embodiment;

[0038] Fig. 20 is a bottom view of the vertical plate;

[0039] Fig.21 It is the left view of the vertical plate;

[0040] Fig. 22 It is a schematic diagram of the oil circuit between the vertical plate and the side oil cylinder tightening assembly of the embodiment;

[0041] Fig.23 It is a schematic diagram of the oil circuit between the vertical plate and the lower oil cylinder tightening assembly of the embodiment;

[0042] Fig.24 Schematic diagram of the oil circuit layout between the cylinder and the vertical plate.

[0043] Fig.25 The three views of the oil circuit block;

[0044] Fig.26 It is a schematic diagram of the oil circuit between the oil circuit block and the base plate;

[0045] Fig. 27 This is a schematic diagram of the layout of one of the oil circuits in the base plate;

[0046] Fig.28 This is a schematic diagram of the layout of another oil circuit in the base plate;

[0047] Fig.29 It is a top view of the side tightening assembly;

[0048] Fig.30 It is a three-dimensional structural schematic diagram of the oil cylinder assembly;

[0049] Fig.31 This is a schematic diagram of the installation of the pressure head;

[0050] Fig.32 Schematic diagram of the installation of the hexagonal rod.

[0051] In the figure, 1-bottom plate, 101-bottom plate first oil circuit, 102-bottom plate second oil circuit, 2-vertical plate, 201-upper oil circuit, 202-lower oil circuit, 203-lower oil cylinder oil inlet circuit, 204-side oil cylinder oil inlet circuit, 205-cylinder first oil inlet circuit, 206-cylinder second oil inlet circuit, 3-oil cylinder, 301-cylinder first oil circuit, 302-cylinder second oil circuit, 4-first pressure plate, 5-top plate mounting plate, 6-top plate, 7- -Side oil cylinder tightening assembly, 701-side oil cylinder body, 702-side oil cylinder bottom plate, 7021-connecting oil circuit, 703-side oil cylinder piston, 704-side oil cylinder top rod, 705-side oil cylinder rear cover, 706-limiting ring, 707-side top screw, 708-side top nut, 709-first spring, 710-first spring pad, 711-oil inlet hole, 712-first spring gasket, 713-fourth spring 713, 8-side positioning seat, 9-lower cylinder tightening assembly, 901-lower cylinder body, 902-lower cylinder piston, 9021-bump, 9022-blind hole, 9023-piston part, 9024-groove, 903-lower cylinder push rod, 9031-slide, 9032-waist hole, 9033-extending part, 904-third spring, 905-second spring, 906-second spring pad, 907-second spring washer , 908-lower cylinder top plate, 909-locking nut, 910-limiting hole, 10-hexagonal rod, 11-first rib, 12-oil rib, 1201-first oil circuit, 1202-second oil circuit, 13-lifting ring, 14-support plate, 15-second pressure plate, 16-second rib, 17-screw, 18-nut, 19-pressure head, 20-oil circuit block, 2001-first oil inlet circuit, 2002-second oil inlet circuit. DETAILED DESCRIPTION

[0052] The specific implementation methods of the invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the invention, but does not constitute a limitation of the invention. In addition, the technical features involved in each implementation method of the invention described below can be combined with each other as long as they do not conflict with each other.

[0053] An engine connecting rod cover boss milling fixture, such as Figure 1-32As shown, it includes a base plate 1 and a vertical plate 2 installed on the base plate 1; a plurality of cylinder assemblies for clamping the workpiece front and back, an upper tightening assembly for supporting the top of the workpiece, a side tightening assembly for tightening one side of the workpiece, a side cylinder tightening assembly 7 for tightening the other side of the workpiece, and a lower cylinder tightening assembly 9 for tightening the bottom of the workpiece are installed on the vertical plate 2; an oil-passing rib plate 12 and an oil circuit block 20 are fixedly connected to the upper end of the base plate 1; oil circuits are provided on the oil circuit block 20, the base plate 1, the oil-passing rib plate 12 and the vertical plate 2; an external oil pipe is connected to the oil circuit block 20, and then connected to the base plate 1, the oil-passing rib plate 12 and the oil circuit of the vertical plate 2 in sequence, and the oil circuit on the vertical plate 2 is respectively connected to the oil circuits of the lower cylinder tightening assembly 9 and the side cylinder tightening assembly 7.

[0054] The above-mentioned engine connecting rod cover boss milling fixture is provided with multiple milling stations, which can effectively improve the processing efficiency compared with a single station; each station is provided with a cylinder assembly for clamping the workpiece front and rear, an upper clamping assembly for supporting the top of the workpiece, a side clamping assembly for clamping one side of the workpiece, a side cylinder clamping assembly 7 for clamping the other side of the workpiece, and a lower cylinder clamping assembly 9 for clamping the bottom of the workpiece. The clamping effect is good, which can effectively prevent the workpiece from moving, and the clamping force on the workpiece is uniform, and no deformation of the parts will be caused; for the complex multi-station connecting rod cover boss milling fixture, a built-in integrated oil circuit is set, which completely eliminates the many adverse effects of complex external oil pipes on station cleaning, disassembly and maintenance, and cutting tool movement.

[0055] Specifically, the lower oil cylinder tightening assembly 9 includes a cylinder body 901, a lower oil cylinder piston 902 and a lower oil cylinder top rod 903 movably installed in the inner cavity of the cylinder body 901; the lower oil cylinder piston 902 and the lower oil cylinder top rod 903 are arranged vertically; the inner cavity of the cylinder body 901 is provided with an annular groove for installing a second spring gasket 907, and the upper part of the second spring gasket 907 is fixedly connected with a second spring pad 906; the two ends of the second spring 905 are respectively connected to the second spring pad 906 and the bottom of the lower oil cylinder top rod 903; the bottom of the lower oil cylinder piston 902 is provided with a groove 90 24. A blind hole 9022 is provided at the center of the bottom of the groove 9024; the lower cylinder piston 902 is integrally connected with a piston portion 9023 slidably connected to the inner wall of the cylinder body 901; an inclined protrusion 9021 is provided on the top of the lower cylinder piston 902; a sliding groove 9031 slidably connected to the protrusion 9021 is provided on one side of the lower cylinder top rod 903; an extension portion 9033 of the lower cylinder top rod 903 extending out of the cylinder body 901 passes through the lower cylinder top plate 908 and is locked by a locking nut 909; screws 17 are installed on both sides of the lower cylinder top plate 908.

[0056] After the hydraulic oil enters the groove 9024 and the blind hole 9022, the lower cylinder piston 902 moves forward under the action of the oil pressure, thereby pushing the lower cylinder top rod 903 to move upward and tighten the bottom of the workpiece. At this time, the second spring 905 is stretched. In this embodiment, the second spring 905 is a tension spring. After the processing is completed, the oil pressure drops, and the lower cylinder top rod 903 drops rapidly under its own gravity and the pulling force of the second spring 905, pushing the lower cylinder piston 902 to move backward and complete the reset. Compared with the standard oil cylinder, the present application adopts a unique lower cylinder tightening assembly 9. On the one hand, the oil circuit layout is simpler and can be integrated with the oil circuits of other clamping assemblies to avoid the adverse effects of external oil pipes. On the other hand, the second spring 905 can increase the reset speed, effectively improving the response speed of the lower cylinder, thereby improving work efficiency.

[0057] Specifically, a limiting hole 910 is provided on the outer wall of the cylinder body 901 ; a waist-shaped hole 9032 is provided at a corresponding position of the lower cylinder top rod 903 ; and a limiting screw for limiting the movement of the lower cylinder top rod 903 is installed on the limiting hole 910 .

[0058] Specifically, the side oil cylinder tightening assembly 7 comprises a side oil cylinder bottom plate 702 mounted on the bottom plate 1, and a side oil cylinder body 701 mounted on the side oil cylinder bottom plate 702; a side oil cylinder piston 703 and a side oil cylinder top rod 704 are movably mounted in the inner cavity of the side oil cylinder body 701; the side oil cylinder piston 703 and the side oil cylinder top rod 704 are vertically arranged; a piston portion which is slidably connected to the inner wall of the side oil cylinder body 701 is integrally connected to the side oil cylinder piston 703; an inclined protrusion is arranged on the top of the side oil cylinder piston 703, and a sliding groove which is slidably connected to the protrusion is opened on the side wall of the side oil cylinder top rod 704; a side oil cylinder rear cover 705 is fixedly mounted on the inner cavity of the side oil cylinder body 701 at the bottom of the side oil cylinder piston 703; the inner cavity of the side oil cylinder body 701 The cavity is provided with an annular groove for installing the first spring gasket 712, and the first spring gasket 712 is fixedly connected to the inside of the first spring gasket 712; the two ends of the first spring 709 are respectively connected to the first spring gasket 710 and the bottom of the side cylinder top rod 704; one end of the side cylinder body 701 is fixedly installed with a limit ring 706 for limiting the movement of the side cylinder top rod 704; one end of the side cylinder top rod 704 is installed with a side top screw 707; the side top screw 707 is installed with a side top nut 708; the side wall of the chamber of the side cylinder body 701 is provided with an oil inlet hole 711; the side cylinder bottom plate 702 is provided with an oil path 7021 connecting the vertical plate 2 and the oil inlet hole 711; the bottom of the side cylinder piston 703 is provided with a blind hole.

[0059] The hydraulic oil enters the inner cavity of the side cylinder body 701 from the oil inlet hole 711, and finally enters the blind hole at the bottom of the side cylinder piston 703, pushing the side cylinder piston 703 to move upward, thereby pushing the side cylinder push rod 704 to move outward to press the side of the workpiece. At this time, the first spring 709 is stretched. In this embodiment, the first spring 709 adopts a tension spring. When the processing is completed, the oil pressure drops, and the side cylinder push rod 704 quickly retreats under the pulling force of the first spring 709, pushing the side cylinder piston 703 to move downward to complete the reset.

[0060] Specifically, in order to further speed up the response speed, a third spring 904 is installed between the piston portion 9023 of the lower oil cylinder piston 902 and the side wall of the inner chamber of the cylinder body 901; a fourth spring 713 is installed between the piston portion of the side oil cylinder piston 703 and the side wall of the inner chamber of the side oil cylinder body 701. In this embodiment, the third spring 904 and the fourth spring 713 are compression springs. In the working state, both are in a compressed state. After the processing is completed, the oil pressure drops, and the two push the lower oil cylinder piston 902 and the side oil cylinder piston 703 to reset respectively.

[0061] Specifically, the upper tightening assembly includes a top plate mounting plate 5 fixedly mounted on the vertical plate 2, and a top plate 6 is fixed on the top of the top plate mounting plate 5. The top plate 6 of the corresponding size can be disassembled and matched according to the size of different connecting rods.

[0062] Specifically, a support plate 14 is installed on the surface of the top plate mounting plate 5; the first rib plate 11 and the second rib plate 16 are fixedly connected to the upper end of the bottom plate 1; the vertical plate 2 is fixedly connected to one side of the first rib plate 11, the second rib plate 16 and the oil-passing rib plate 12. The support plate 14 of the corresponding thickness can be disassembled according to the size of different connecting rods. The first rib plate 11, the second rib plate 16 and the oil-passing rib plate 12 can play the role of installing and fixing the vertical plate 2, and can ensure the installation stability of the vertical plate 2. In addition, the oil-passing rib plate 12 also plays the role of connecting the built-in oil circuit, and is an indispensable component of the built-in oil circuit layout in the entire device.

[0063] Specifically, the side tightening assembly includes a side positioning seat 8 fixedly mounted on the vertical plate 2; a screw 17 is mounted on the side positioning seat 8; and a nut 18 is mounted on the screw 17. The screwing length of the screw 17 relative to the side positioning seat 8 can be adjusted according to the size of different connecting rods.

[0064] Specifically, the oil cylinder assembly includes a plurality of oil cylinders 3; a pressure plate is fixedly installed at one end of the piston rod of the oil cylinder 3; a pressure head is installed on one side of the pressure plates located on both sides; and a pressure head 19 is installed on one side of the remaining pressure plates. In the two groups of clamps in this embodiment, each group of pressure plates located on both sides is called the first pressure plate 4, and the three pressure plates located in the middle are called the second pressure plate 15. A strip hole is opened on one side of the first pressure plate 4, and a bolt is inserted into the strip hole and locked with a pressure head 19; a screw is fixed on the other side of the first pressure plate 4, and a hexagonal rod 10 is installed on the screw. Pressure heads 19 are installed on both sides of the second pressure plate 15. The screw and the hexagonal rod 10 can be used as a pad rod in combination, and their function is to prevent the first pressure plate 4 from rotating due to the eccentric load when clamping the workpiece, resulting in clamping failure. And the length of the screw screwed into the hexagonal rod 10 can be adjusted for connecting rods of different sizes, thereby adjusting the effective length of the pad rod.

[0065] Specifically, for the convenience of installation, the tops of the first ribs 11 and the oil-passing ribs 12 located on both sides are provided with hanging rings 13 .

[0066] The layout of the oil circuit in this embodiment is as follows:

[0067] A first oil inlet 2001 and a second oil inlet 2002 are arranged inside the oil circuit block 20; a first oil circuit 101 and a second oil circuit 102 are respectively opened inside one end of the bottom plate 1; a first oil circuit 1201 and a second oil circuit 1202 are respectively opened inside the oil rib plate 12; an upper oil circuit 201 and a lower oil circuit 202 are opened on the vertical plate 2; the upper oil circuit 201 is respectively connected to the lower cylinder oil inlet 203, the side cylinder oil inlet 204 and the first cylinder oil inlet 205; the lower oil circuit 202 is connected to the second cylinder oil inlet 206.

[0068] The first oil inlet 2001 is connected to the first oil circuit 101 of the bottom plate, the first oil circuit 101 of the bottom plate is connected to the first oil circuit 1201, and the first oil circuit 1201 is connected to the upper oil circuit 201; the upper oil circuit 201 is connected to the cavity formed between the lower cylinder body 901 and the vertical plate 2 through the lower cylinder oil inlet 203. The hydraulic oil enters the cavity of the lower cylinder body 901 through the first oil inlet 2001, the first oil circuit 101, the first oil circuit 1201, the upper oil circuit 201, and the lower cylinder oil inlet 203, and finally enters the blind hole 9022. The lower cylinder piston 902 moves forward under the action of the oil pressure, thereby pushing the lower cylinder push rod 903 to move upward and tighten the bottom of the workpiece. At this time, the third spring 904 is compressed and the second spring 905 is stretched. In this embodiment, the second spring 905 is a tension spring and the third spring 904 is a compression spring. When the processing is completed, the oil pressure drops, and the lower cylinder push rod 903 drops rapidly under the action of its own gravity and the pulling force of the second spring 905, pushing the lower cylinder piston 902 to move backward to complete the reset.

[0069] The upper oil circuit 201 is also connected to the connecting oil circuit 7021 of the side cylinder bottom plate 702 through the side cylinder oil inlet circuit 204. The hydraulic oil enters the chamber of the side cylinder body 701 through the first oil inlet circuit 2001, the first oil circuit 101, the first oil circuit 1201, the upper oil circuit 201, the side cylinder oil inlet circuit 204, the connecting oil circuit 7021, and the oil inlet hole 711, and finally enters the blind hole of the side cylinder piston 703. The side cylinder piston 703 moves upward under the action of the oil pressure, thereby pushing the side cylinder push rod 704 to move outward and tighten the side of the workpiece. At this time, the fourth spring 713 is compressed and the first spring 709 is stretched. In this embodiment, the first spring 709 is a tension spring and the fourth spring 713 is a compression spring. When the processing is completed, the oil pressure drops, and the side cylinder push rod 704 quickly retreats under the pulling force of the first spring 709, pushing the side cylinder piston 703 to move downward to complete the reset.

[0070] The upper oil circuit 201 is also connected to the first oil circuit 301 of the oil cylinder 3 through the first oil inlet circuit 205 of the oil cylinder. The second oil inlet circuit 2002 is connected to the second oil circuit 102 of the bottom plate, and the second oil circuit 102 of the bottom plate is connected to the second oil circuit 1202; the second oil circuit 1202 is connected to the lower oil circuit 202, and the lower oil circuit 202 is connected to the second oil inlet circuit 206 of the oil cylinder, and the second oil inlet circuit 206 of the oil cylinder is connected to the second oil circuit 302 of the oil cylinder. The hydraulic oil enters the inner cavity head of the oil cylinder 3 through the first oil circuit 302 of the oil cylinder, pushes the piston rod of the oil cylinder 3 back, and presses the workpiece. When the hydraulic oil enters the inner cavity tail of the oil cylinder 3 through the first oil circuit 301 of the oil cylinder, it pushes the piston rod of the oil cylinder 3 to extend, loosens the workpiece, and completes the reset. Except for the oil circuit setting, the rest of the structure of the oil cylinder 3 is consistent with the standard oil cylinder structure. Fig.24 It is only a schematic diagram of the oil circuit layout between the oil cylinder 3 and the vertical plate 2, and the internal structure of the oil cylinder 3 is not drawn in detail.

[0071] A groove for installing a sealing ring is provided in the middle of the piston part of the side cylinder piston 703 and the lower cylinder piston 902.

[0072] Each oil passage opened inside the bottom plate 1 and the vertical plate 2 extends to the side walls of the bottom plate 1 and the vertical plate 2, and is equipped with an oil plug for blocking the oil passage.

[0073] Working principle of the invention:

[0074] When in use, the workpiece is placed on the two screw rods 17 installed on the lower oil cylinder top plate 908, and one side of the workpiece is close to the screw rod 17 installed on the side positioning seat 8. The oil pressure system is controlled to work, and the oil pressure entering the upper oil circuit 201 increases, and the hydraulic oil pushes the lower oil cylinder piston 902 to move forward, thereby pushing the lower oil cylinder top rod 903 to move upward, driving the lower oil cylinder top plate 908 and the two screw rods 17 to move upward, and clamping the workpiece between the screw rod 17 and the top plate 6. At this time, the third spring 904 is compressed and the second spring 905 is stretched. At the same time, the hydraulic oil also pushes the side oil cylinder piston 703 to move upward, thereby pushing the side oil cylinder top rod 704 to move outward, pushing the side top screw rod 707 to move outward, and clamping the workpiece between the side top screw rod 707 and the screw rod 17 of the side top tightening assembly. At this time, the fourth spring 713 is compressed and the first spring 709 is stretched. At the same time, the hydraulic oil pushes the piston rod of the oil cylinder 3 back, driving the pressure plate and the pressure head 19 to move backward, clamping the workpiece between the pressure head 19 and the support plate 14. The workpiece is clamped in three directions: up and down, front and back, left and right. The clamping effect is good, which can effectively prevent the workpiece from moving, and the clamping force on the workpiece is uniform, which will not cause deformation of the parts.

[0075] After the milling is completed, the oil pressure entering the upper oil circuit 201 decreases, and the oil pressure entering the lower oil circuit 202 increases. The lower cylinder top rod 903 falls back under the action of its own weight and the pulling force of the second spring 905, and the lower cylinder piston 902 moves backward under the thrust of the lower cylinder top rod 903 and the third spring 904. At the same time, the side cylinder top rod 704 retreats into the side cylinder body 701 under the pulling force of the first spring 709, and the side cylinder piston 703 descends under the thrust of the side cylinder top rod 704, the fourth spring 713 and its own weight. At the same time, the hydraulic oil enters the tail of the inner cavity of the cylinder 3, pushing the piston rod of the cylinder 3 to extend and loosen the workpiece. At this point, the resetting of all clamping components is completed and the lock on the workpiece is released. The operator removes the processed workpiece and the milling is completed.

[0076] The embodiments of the invention are described in detail above with reference to the accompanying drawings, but the invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the invention, and still fall within the scope of protection of the invention.

Claims

1. A milling fixture for engine connecting rod cover boss, characterized in that: The invention comprises a bottom plate (1) and a vertical plate (2) mounted on the bottom plate (1); the vertical plate (2) is mounted with a plurality of oil cylinder assemblies for clamping a workpiece front and rear, an upper tightening assembly for supporting the top of the workpiece, a side tightening assembly for tightening one side of the workpiece, a side oil cylinder tightening assembly (7) for tightening the other side of the workpiece, and a lower oil cylinder tightening assembly (9) for tightening the bottom of the workpiece; an oil passage rib plate (12) and an oil passage block (20) are fixedly connected to the upper end of the bottom plate (1); oil passages are provided on the oil passage block (20), the bottom plate (1), the oil passage rib plate (12) and the vertical plate (2); an external oil pipe is connected to the oil passage block (20), and then sequentially connects the bottom plate (1), the oil passage rib plate (12) and the oil passage of the vertical plate (2); the oil passage on the vertical plate (2) is connected to the oil passages of the lower oil cylinder tightening assembly (9), the side oil cylinder tightening assembly (7) and the oil passages of the oil cylinder assembly.

2. The engine connecting rod cover boss milling fixture according to claim 1, characterized in that: The lower oil cylinder tightening assembly (9) comprises a cylinder body (901), a lower oil cylinder piston (902) movably mounted in the inner cavity of the cylinder body (901), and a lower oil cylinder push rod (903); the lower oil cylinder piston (902) and the lower oil cylinder push rod (903) are arranged vertically; the inner cavity of the cylinder body (901) is provided with an annular groove for mounting a second spring gasket (907), and the upper part of the second spring gasket (907) is fixedly connected with a second spring pad (906); the two ends of the second spring (905) are respectively connected to the second spring pad (906) and the bottom of the lower oil cylinder push rod (903); the bottom of the lower oil cylinder piston (902) is provided with a groove (9024), and the groove A blind hole (9022) is provided at the center of the bottom of the groove (9024); the lower cylinder piston (902) is integrally connected with a piston portion (9023) slidably connected to the inner wall of the cylinder body (901); an inclined protrusion (9021) is provided on the top of the lower cylinder piston (902); a sliding groove (9031) slidably connected to the protrusion (9021) is provided on one side of the lower cylinder top rod (903); the protruding portion (9033) of the lower cylinder top rod (903) protruding from the cylinder body (901) passes through the lower cylinder top plate (908) and is locked by a locking nut (909); screws (17) are installed on both sides of the lower cylinder top plate (908).

3. The engine connecting rod cover boss milling fixture according to claim 2, characterized in that: A limiting hole (910) is provided on the outer wall of the cylinder body (901); a waist-shaped hole (9032) is provided at a corresponding position of the lower oil cylinder top rod (903); and a limiting screw for limiting the movement of the lower oil cylinder top rod (903) is installed on the limiting hole (910).

4. The engine connecting rod cover boss milling fixture according to claim 2, characterized in that: The side oil cylinder tightening assembly (7) comprises a side oil cylinder bottom plate (702) mounted on the bottom plate (1) and a side oil cylinder body (701) mounted on the side oil cylinder bottom plate (702); a side oil cylinder piston (703) and a side oil cylinder top rod (704) are movably mounted in the inner cavity of the side oil cylinder body (701); the side oil cylinder piston (703) and the side oil cylinder top rod (704) are vertically arranged; a piston portion slidably connected to the inner wall of the side oil cylinder body (701) is integrally connected to the side oil cylinder piston (703); an inclined protrusion is arranged on the top of the side oil cylinder piston (703), and a sliding groove slidably connected to the protrusion is opened on the side wall of the side oil cylinder top rod (704); a side oil cylinder rear cover (705) is fixedly mounted in the inner cavity of the side oil cylinder body (701) at the bottom of the side oil cylinder piston (703); The inner cavity of the body (701) is provided with an annular groove for installing a first spring washer (712), and the first spring washer (712) is fixedly connected to the inside of the first spring washer (710); the two ends of the first spring (709) are respectively connected to the first spring washer (710) and the bottom of the side cylinder top rod (704); a limit ring (706) for limiting the movement of the side cylinder top rod (704) is fixedly installed at one end of the side cylinder body (701); a side top screw (707) is installed at one end of the side cylinder top rod (704); an oil inlet hole (711) is provided on the side wall of the chamber of the side cylinder body (701); a connecting oil path (7021) connecting the vertical plate (2) and the oil inlet hole (711) is provided on the side cylinder bottom plate (702); and a blind hole is provided at the bottom of the side cylinder piston (703).

5. The engine connecting rod cover boss milling fixture according to claim 4, characterized in that: A third spring (904) is installed between the piston portion (9023) of the lower cylinder piston (902) and the side wall of the internal chamber of the cylinder body (901); a fourth spring (713) is installed between the piston portion of the side cylinder piston (703) and the side wall of the internal chamber of the side cylinder body (701).

6. The engine connecting rod cover boss milling fixture according to claim 1, characterized in that: The upper tightening assembly comprises a top plate mounting plate (5) fixedly mounted on the vertical plate (2), and a top plate (6) is fixed on the top of the top plate mounting plate (5).

7. The engine connecting rod cover boss milling fixture according to claim 6, characterized in that: A backing plate (14) is installed on the surface of the top plate mounting plate (5); a first rib plate (11) and a second rib plate (16) are fixedly connected to the upper end of the bottom plate (1); and the vertical plate (2) is fixedly connected to one side of the first rib plate (11), the second rib plate (16) and the oil-passing rib plate (12).

8. The engine connecting rod cover boss milling fixture according to claim 1, characterized in that: The side tightening assembly comprises a side positioning seat (8) fixedly mounted on the vertical plate (2); a screw rod (17) is mounted on the side positioning seat (8).

9. The engine connecting rod cover boss milling fixture according to claim 1, characterized in that: The oil cylinder assembly comprises a plurality of oil cylinders (3); a pressure plate is fixedly mounted on one end of the piston rod of the oil cylinder (3); a pressure head is mounted on one side of the pressure plates located on both sides; and a pressure head (19) is mounted on one side of the remaining pressure plates.

10. The engine connecting rod cover boss milling fixture according to claim 9, characterized in that: A pad rod is fixedly connected to the side of the pressing plate located on both sides where the pressing head (19) is not installed; the pad rod includes a screw rod fixedly connected to the pressing head and a hexagonal rod (10) installed on the screw rod; the hole opened on the pressing plate for installing the pressing head (19) is a strip hole, a bolt is inserted into the strip hole, and is locked with the pressing head (19).

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