Engine connecting rod cap boss milling fixture

Abstract

The application discloses an engine connecting rod cover boss milling clamp, which comprises a bottom plate, a vertical plate, an oil cylinder assembly for clamping a workpiece from front to back, an upper pressing assembly for pressing the top of the workpiece, a side pressing assembly for pressing one side of the workpiece, a side oil cylinder pressing assembly for pressing the other side of the workpiece, a lower oil cylinder pressing assembly for pressing the bottom of the workpiece, an oil passing rib plate and an oil path block are fixed to the upper end of the bottom plate, oil paths are formed in the oil path block, the bottom plate, the oil passing rib plate and the vertical plate, an external oil pipe is connected with the oil path block, then sequentially communicates with the oil path of the bottom plate, the oil path of the oil passing rib plate and the oil path of the vertical plate, and the oil paths on the vertical plate are respectively communicated with the oil paths of the lower oil cylinder pressing assembly and the side oil cylinder pressing assembly. The engine connecting rod cover boss milling clamp has the advantages that multiple milling stations are arranged, the machining efficiency is high, an integrated oil path is arranged in the engine connecting rod cover boss milling clamp, and the complex external oil pipe is completely cancelled, so that the adverse effects of the external oil pipe on work station cleaning, dismounting and maintenance, cutting tool movement and the like are eliminated.

Description

Technical Field

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

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

[0003] Engine connecting rods consist of the rod body and the connecting rod cap. The milling accuracy of the connecting rod cap boss directly affects the fit between the connecting rod cap, connecting rod, and crankshaft. Poor fit leads to power loss, increased vibration, and accelerated wear. Due to the complex shape of the connecting rod cap, a dedicated fixture is needed to fix the workpiece in place to ensure milling accuracy and prevent movement or deformation during machining. To improve machining efficiency, multi-station fixtures are often used. Because of the complex shape of the connecting rod cap, even a single-station fixture requires clamping in three directions: up, down, forward, backward, and left. Therefore, multi-station fixtures require a large number of clamping components. Most current clamping components use hydraulic cylinders, each standard hydraulic cylinder connected to two external oil pipes, resulting in a large number of external oil pipes required for multi-station fixtures. This leads to complex oil pipe wiring, causing inconvenience for cleaning, disassembly, and maintenance at the workstations. Furthermore, the complex oil pipes can interfere with the movement of the cutting tool, affecting machining. Summary of the Invention

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

[0005] To solve the above-mentioned technical problems, the invention provides a milling fixture for an engine connecting rod cover boss, comprising a base plate and a vertical plate mounted on the base plate; the vertical plate is equipped with a plurality of hydraulic cylinder assemblies for clamping workpieces front and rear, an upper clamping assembly for pressing the top of the workpiece, a side clamping assembly for pressing one side of the workpiece, a side hydraulic cylinder clamping assembly for pressing the other side of the workpiece, and a lower hydraulic cylinder clamping assembly for pressing the bottom of the workpiece; an oil passage rib and an oil passage block are fixedly connected to the upper end of the base plate; oil passages are provided on the oil passage block, the base plate, the oil passage rib, and the vertical plate; an external oil pipe is connected to the oil passage block, and then sequentially connects to the oil passages of the base plate, the oil passage rib, and the vertical plate, and the oil passages on the vertical plate are respectively connected to the oil passages of the lower hydraulic cylinder clamping assembly and the side hydraulic cylinder clamping assembly.

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

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

[0008] Furthermore, the side cylinder clamping assembly includes a side cylinder base plate mounted on the base plate and a side cylinder body mounted on the side cylinder base plate; a side cylinder piston and a side cylinder push rod are movably mounted in the inner cavity of the side cylinder body; the side cylinder piston and the side cylinder push rod are vertically arranged; a piston part is integrally connected to the side cylinder piston and slidably connected to the inner wall of the side cylinder body; an inclined protrusion is provided on the top of the side cylinder piston, and a sliding groove is provided on the side wall of the side cylinder push rod to slidably connect with the protrusion; a side cylinder rear cover is fixedly installed in the inner cavity of the side cylinder body at the bottom of the side cylinder piston; The inner cavity of the cylinder body has an annular groove for installing a first spring washer, and a first spring pad is fixedly connected inside the first spring washer; both ends of the first spring are connected to the first spring pad and the bottom of the side cylinder push rod, respectively; a limiting ring for restricting the movement of the side cylinder push rod is fixedly installed at one end of the side cylinder body; a side push screw is installed at one end of the side cylinder push rod; a side push nut is installed on the side push screw; an oil inlet hole is opened in the side wall of the side cylinder body; a connecting oil passage is opened on the bottom plate of the side cylinder to connect the vertical plate and the oil inlet hole; a blind hole is opened at the bottom of the side cylinder piston.

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

[0010] Furthermore, the upper clamping assembly includes a top plate mounting plate fixedly installed on the upright plate, and a top plate is fixed to the top of the top plate mounting plate.

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

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

[0013] Furthermore, the hydraulic cylinder assembly includes several hydraulic cylinders; a pressure plate is fixedly installed at one end of the piston rod of each hydraulic cylinder; a pressure head is installed on one side of the pressure plates located on both sides; and a pressure head is installed on one side of the remaining pressure plates.

[0014] Furthermore, a pad rod is fixed to the side of the pressure plate on both sides where the pressure head is not installed; the pad rod includes a screw fixed to the pressure head and a hexagonal bar installed on the screw; the hole for installing the pressure head 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, lifting rings are installed on the top of the first rib and the oil-through rib located on both sides.

[0016] Beneficial effects of the invention:

[0017] (1) This application has multiple milling stations, which can effectively improve processing efficiency compared to a single station; each station is equipped with a hydraulic cylinder assembly for clamping the workpiece from the front and rear, an upper clamping assembly for pressing the top of the workpiece, a side clamping assembly for pressing one side of the workpiece, a side hydraulic cylinder clamping assembly for pressing the other side of the workpiece, and a lower hydraulic cylinder clamping assembly for pressing 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 the parts to deform.

[0018] (2) The upper end of the base plate of this application is fixedly connected to an oil passage rib and an oil passage block; oil passages are provided on the oil passage block, the base plate, the oil passage rib, and the vertical plate; an external oil pipe is connected to the oil passage block, and then sequentially connects to the oil passages of the base plate, the oil passage rib, and the vertical plate. The oil passages on the vertical plate are respectively connected to the oil passages of the lower oil cylinder clamping assembly and the side oil cylinder clamping assembly. This invention provides a built-in integrated oil passage for a complex multi-station connecting rod cap boss milling fixture, completely eliminating the many adverse effects of complex external oil pipes on station cleaning, disassembly and maintenance, and cutting tool movement. Attached Figure Description

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

[0020] Figure 2 for Figure 1 The right view;

[0021] Figure 3 for Figure 1 A three-dimensional structural diagram of the lower hydraulic cylinder clamping assembly;

[0022] Figure 4 This is a schematic diagram of the internal structure of the lower hydraulic cylinder clamping assembly when it is installed on the vertical plate.

[0023] Figure 5 for Figure 4 A three-dimensional structural diagram of the piston in the lower hydraulic cylinder;

[0024] Figure 6 for Figure 4 Cross-sectional view of the piston in the lower hydraulic cylinder;

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

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

[0027] Figure 9 for Figure 7 A sectional view of the push rod of the lower hydraulic cylinder;

[0028] Figure 10 for Figure 1 A three-dimensional structural diagram of the side hydraulic cylinder clamping assembly;

[0029] Figure 11 for Figure 10 A cross-sectional view of the middle-side hydraulic cylinder clamping assembly in one direction;

[0030] Figure 12 for Figure 10 A cross-sectional view of the middle-side hydraulic cylinder clamping assembly from another direction;

[0031] Figure 13 for Figure 10 Top view of the bottom plate of the middle hydraulic cylinder;

[0032] Figure 14 for Figure 13 A sectional view;

[0033] Figure 15 for Figure 1 Side view of the central oil rib;

[0034] Figure 16 for Figure 1 Front view of the central oil rib plate;

[0035] Figure 17 This is a schematic diagram showing the connection of one of the oil passages between the base plate, the oil-through rib plate, and the vertical plate in an embodiment.

[0036] Figure 18This is a schematic diagram showing the connection of another oil passage between the base plate, the oil-through rib plate, and the vertical plate in an embodiment.

[0037] Figure 19 This is a perspective view of the oil passage arrangement of the vertical plate in the embodiment;

[0038] Figure 20 This is a bottom view of the upright panel;

[0039] Figure 21 This is the left view of the upright panel;

[0040] Figure 22 This is a schematic diagram of the oil circuit between the upright plate and the side cylinder clamping assembly in an embodiment;

[0041] Figure 23 This is a schematic diagram of the oil circuit between the upright plate and the lower hydraulic cylinder clamping assembly in an embodiment;

[0042] Figure 24 This is a schematic diagram of the oil circuit layout between the oil cylinder and the vertical plate.

[0043] Figure 25 Here are the three views of the oil passage block;

[0044] Figure 26 This is a schematic diagram of the oil passage between the oil passage block and the base plate;

[0045] Figure 27 This is a schematic diagram showing the layout of one of the oil passages within the base plate;

[0046] Figure 28 This is a schematic diagram showing the layout of another oil passage within the base plate;

[0047] Figure 29 Top view of the side clamping assembly;

[0048] Figure 30 This is a three-dimensional structural diagram of the hydraulic cylinder assembly;

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

[0050] Figure 32 This is a schematic diagram of the installation of a hexagonal bar.

[0051] In the diagram, 1-base plate, 101-base plate first oil passage, 102-base plate second oil passage, 2-vertical plate, 201-upper oil passage, 202-lower oil passage, 203-lower oil cylinder inlet passage, 204-side oil cylinder inlet passage, 205-oil cylinder first inlet passage, 206-oil cylinder second inlet passage, 3-oil cylinder, 301-oil cylinder first oil passage, 302-oil cylinder second oil passage, 4-first pressure plate, 5-top plate mounting plate, 6-top plate, 7-... - Side cylinder clamping assembly, 701- Side cylinder body, 702- Side cylinder base plate, 7021- Connecting oil passage, 703- Side cylinder piston, 704- Side cylinder push rod, 705- Side cylinder rear cover, 706- Limiting ring, 707- Side push screw, 708- Side push nut, 709- First spring, 710- First spring washer, 711- Oil inlet, 712- First spring washer, 713- Fourth spring. 8-Side positioning seat, 9-Lower cylinder clamping assembly, 901-Lower cylinder body, 902-Lower cylinder piston, 9021-Protrusion, 9022-Blind hole, 9023-Piston part, 9024-Groove, 903-Lower cylinder push rod, 9031-Slide groove, 9032-Oval hole, 9033-Extension, 904-Third spring, 905-Second spring, 906-Second spring washer, 907-Second spring gasket 908-Lower cylinder top plate, 909-Locking nut, 910-Limiting hole, 10-Hexagonal bar, 11-First rib, 12-Oil passage rib, 1201-First oil passage, 1202-Second oil passage, 13-Lifting ring, 14-Backing plate, 15-Second pressure plate, 16-Second rib, 17-Screw, 18-Nut, 19-Pressure head, 20-Oil passage block, 2001-First oil inlet passage, 2002-Second oil inlet passage. Detailed Implementation

[0052] The specific embodiments of the invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the invention and do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

[0053] A milling fixture for engine connecting rod cover bosses, such as Figure 1-32As shown, the system includes a base plate 1 and a vertical plate 2 mounted on the base plate 1. The vertical plate 2 is equipped with several hydraulic cylinder assemblies for clamping workpieces from the front and rear, an upper clamping assembly for pressing the top of the workpiece, a side clamping assembly for pressing one side of the workpiece, a side hydraulic cylinder clamping assembly 7 for pressing the other side of the workpiece, and a lower hydraulic cylinder clamping assembly 9 for pressing the bottom of the workpiece. An oil passage rib 12 and an oil passage block 20 are fixedly connected to the upper end of the base plate 1. Oil passages are provided on the oil passage block 20, the base plate 1, the oil passage rib 12, and the vertical plate 2. An external oil pipe is connected to the oil passage block 20, and then sequentially connects to the oil passages of the base plate 1, the oil passage rib 12, and the vertical plate 2. The oil passages on the vertical plate 2 are respectively connected to the oil passages of the lower hydraulic cylinder clamping assembly 9 and the side hydraulic cylinder clamping assembly 7.

[0054] The aforementioned milling fixture for connecting rod cap bosses features multiple milling stations, significantly improving machining efficiency compared to a single-station fixture. Each station is equipped with a hydraulic cylinder assembly for clamping the workpiece from the front and rear, an upper clamping assembly for supporting the top of the workpiece, a side clamping assembly for supporting one side of the workpiece, a side hydraulic cylinder clamping assembly 7 for supporting the other side of the workpiece, and a lower hydraulic cylinder clamping assembly 9 for supporting the bottom of the workpiece. This provides excellent clamping performance, effectively preventing workpiece movement and ensuring uniform clamping force without causing deformation. Furthermore, the fixture incorporates a built-in integrated hydraulic circuit, completely eliminating the negative impacts of complex external hydraulic pipes on station cleaning, disassembly and maintenance, and cutting tool movement.

[0055] Specifically, the lower cylinder clamping assembly 9 includes a cylinder body 901, a lower cylinder piston 902 and a lower cylinder push rod 903 movably installed in the inner cavity of the cylinder body 901; the lower cylinder piston 902 and the lower cylinder push rod 903 are vertically arranged; the inner cavity of the cylinder body 901 has an annular groove for installing a second spring washer 907, and a second spring pad 906 is fixedly connected to the upper part of the second spring washer 907; the two ends of the second spring 905 are respectively connected to the bottom of the second spring pad 906 and the bottom of the lower cylinder push rod 903; the bottom of the lower cylinder piston 902 has a groove 90. 24. A blind hole 9022 is provided at the center of the bottom of the groove 9024; the piston part 9023 of the lower cylinder piston 902 is integrally 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 is provided on one side of the lower cylinder push rod 903, which is slidably connected to the protrusion 9021; the protrusion part 9033 of the lower cylinder push rod 903 extends out of the cylinder body 901 and 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 hydraulic oil enters the groove 9024 and blind hole 9022, the lower cylinder piston 902 moves forward under the action of oil pressure, thereby pushing the lower cylinder push rod 903 upward to press against 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 processing is completed, the oil pressure drops, and the lower cylinder push rod 903 descends rapidly under its own weight and the tension of the second spring 905, pushing the lower cylinder piston 902 backward to complete the reset. Compared with the standard cylinder, this application uses a unique lower cylinder pressing component 9. On the one hand, the oil circuit layout is simpler and can be integrated with the oil circuit of other clamping components, avoiding the adverse effects of external oil pipes. On the other hand, the reset speed can be improved by the second spring 905, effectively increasing 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 the corresponding position of the lower cylinder push rod 903; a limiting screw for limiting the movement of the lower cylinder push rod 903 is installed on the limiting hole 910.

[0058] Specifically, the side cylinder clamping assembly 7 includes a side cylinder base plate 702 mounted on the base plate 1 and a side cylinder body 701 mounted on the side cylinder base plate 702; a side cylinder piston 703 and a side cylinder push rod 704 are movably installed in the inner cavity of the side cylinder body 701; the side cylinder piston 703 and the side cylinder push rod 704 are vertically arranged; a piston part integrally connected to the side cylinder piston 703 and slidably connected to the inner wall of the side cylinder body 701; an inclined protrusion is provided on the top of the side cylinder piston 703, and a sliding groove is provided on the side wall of the side cylinder push rod 704 and slidably connected to the protrusion; a side cylinder rear cover 705 is fixedly installed in the inner cavity of the side cylinder body 701 at the bottom of the side cylinder piston 703; the inner cavity of the side cylinder body 701... The cavity has an annular groove for installing the 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 push rod 704; a limiting ring 706 for restricting the movement of the side cylinder push rod 704 is fixedly installed at one end of the side cylinder body 701; a side push screw 707 is installed at one end of the side cylinder push rod 704; a side push nut 708 is installed on the side push screw 707; an oil inlet hole 711 is opened on the side wall of the cavity of the side cylinder body 701; a connecting oil passage 7021 connecting the vertical plate 2 and the oil inlet hole 711 is opened on the side cylinder bottom plate 702; a blind hole is opened at the bottom of the side cylinder piston 703.

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

[0060] Specifically, to further accelerate the response speed, 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. In this embodiment, the third spring 904 and the fourth spring 713 are compression springs. During operation, both are in a compressed state. After processing, the oil pressure drops, and both springs push the lower cylinder piston 902 and the side cylinder piston 703 to reset, respectively.

[0061] Specifically, the upper clamping assembly includes a top plate mounting plate 5 fixedly installed on the vertical plate 2, and a top plate 6 fixed to the top of the top plate mounting plate 5. The top plate 6 of the corresponding size can be removed and replaced according to the size of different connecting rods.

[0062] Specifically, a backing plate 14 is mounted on the surface of the top mounting plate 5; a first rib 11 and a second rib 16 are fixedly connected to the upper end of the bottom plate 1; and the upright plate 2 is fixedly connected to one side of the first rib 11, the second rib 16, and the oil-connecting rib 12. Backing plates 14 of appropriate thickness can be disassembled and matched to accommodate different connecting rod sizes. The first rib 11, the second rib 16, and the oil-connecting rib 12 serve to install and fix the upright plate 2, ensuring its installation stability. Furthermore, the oil-connecting rib 12 also connects to the internal oil passages, making it an indispensable component in the overall internal oil passage layout of the device.

[0063] Specifically, the side clamping assembly includes a side positioning seat 8 fixedly mounted on the upright plate 2; a screw 17 is mounted on the side positioning seat 8; and a nut 18 is mounted on the screw 17. The screw 17 can be adjusted in screw length relative to the side positioning seat 8 for different connecting rod sizes.

[0064] Specifically, the hydraulic cylinder assembly includes several hydraulic cylinders 3; a pressure plate is fixedly installed at one end of the piston rod of each hydraulic 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 this embodiment, in the two sets of clamps, the pressure plates located on both sides of each set are called the first pressure plates 4, and the three pressure plates located in the middle are called the second pressure plates 15. A strip-shaped hole is opened on one side of the first pressure plate 4, and a bolt is inserted into the strip-shaped hole and locked with the pressure head 19; a screw is fixed to the other side of the first pressure plate 4, and a hexagonal bar 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 bar 10 work together to be used as a pad, which prevents the first pressure plate 4 from rotating due to the eccentric load when clamping the workpiece, thus preventing clamping failure. Furthermore, the effective length of the pad can be adjusted by adjusting the length of the screw screw into the hexagonal bar 10 for connecting rods of different sizes.

[0065] Specifically, for ease of installation, lifting rings 13 are installed on the top of the first rib plate 11 and the oil-through rib plate 12 located on both sides.

[0066] The oil circuit is arranged as follows in this embodiment:

[0067] The oil passage block 20 is provided with a first oil inlet 2001 and a second oil inlet 2002; the bottom plate 1 is provided with a first oil passage 101 and a second oil passage 102 at one end; the oil passage rib 12 is provided with a first oil passage 1201 and a second oil passage 1202; the vertical plate 2 is provided with an upper oil passage 201 and a lower oil passage 202; the upper oil passage 201 is connected to the lower oil cylinder inlet 203, the side oil cylinder inlet 204 and the first oil cylinder inlet 205; the lower oil passage 202 is connected to the second oil cylinder inlet 206.

[0068] The first oil inlet passage 2001 is connected to the first oil inlet passage 101 of the base plate, the first oil inlet passage 101 of the base plate is connected to the first oil inlet passage 1201, and the first oil inlet passage 1201 is connected to the upper oil inlet passage 201. The upper oil inlet passage 201 is connected to the cavity formed between the lower cylinder body 901 and the vertical plate 2 through the lower cylinder inlet passage 203. Hydraulic oil enters the cavity of the lower cylinder body 901 through the first oil inlet passage 2001, the first oil inlet passage 101, the first oil inlet passage 1201, the upper oil inlet passage 201, and the lower cylinder inlet passage 203, and finally enters the blind hole 9022. The lower cylinder piston 902 moves forward under the action of oil pressure, thereby pushing the lower cylinder push rod 903 to move upward and press against 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. After processing is completed, the oil pressure drops, and the lower cylinder push rod 903 descends rapidly under its own weight and the pulling force of the second spring 905, pushing the lower cylinder piston 902 to move backward and complete the reset.

[0069] The upper oil passage 201 is also connected to the connecting oil passage 7021 of the side cylinder base plate 702 via the side cylinder inlet oil passage 204. Hydraulic oil enters the cavity of the side cylinder body 701 through the first oil inlet oil passage 2001, the first oil passage 101, the first oil passage 1201, the upper oil passage 201, the side cylinder inlet oil passage 204, the connecting oil passage 7021, and the oil inlet hole 711, and finally enters the blind hole of the side cylinder piston 703. Under the action of oil pressure, the side cylinder piston 703 moves upward, thereby pushing the side cylinder push rod 704 to move outward and press against 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. After processing is completed, the oil pressure drops, and the side cylinder push rod 704 quickly retracts under the tension of the first spring 709, pushing the side cylinder piston 703 downward to complete the reset.

[0070] The upper oil passage 201 is also connected to the first oil passage 301 of the cylinder 3 via the first oil inlet passage 205. The second oil inlet passage 2002 is connected to the second oil passage 102 of the base plate, which in turn is connected to the second oil passage 1202; the second oil passage 1202 is connected to the lower oil passage 202, which is connected to the second oil inlet passage 206 of the cylinder, which is connected to the second oil passage 302 of the cylinder. Hydraulic oil enters the head cavity of the cylinder 3 through the first oil passage 302, pushing the piston rod of the cylinder 3 to retract and press the workpiece. When hydraulic oil enters the tail cavity of the cylinder 3 through the first oil passage 301, it pushes the piston rod of the cylinder 3 to extend, releasing the workpiece and completing the reset. Except for the oil passage configuration, the structure of the cylinder 3 is the same as that of a standard cylinder. Figure 24 The diagram only shows the oil circuit arrangement between the hydraulic cylinder 3 and the vertical plate 2, without detailing the internal structure of the hydraulic cylinder 3.

[0071] The piston portions of both the side cylinder piston 703 and the lower cylinder piston 902 have grooves for installing sealing rings.

[0072] Each oil passage inside the base plate 1 and the vertical plate 2 extends to the side wall of the base plate 1 and the vertical plate 2, and each is equipped with an oil plug to seal the oil passage.

[0073] The working principle of the invention:

[0074] In use, the workpiece is placed on the two screws 17 mounted on the lower cylinder top plate 908, with one side of the workpiece close to the screw 17 mounted on the side positioning seat 8. The hydraulic system is activated, increasing the oil pressure in the upper oil passage 201. This hydraulic oil pushes the lower cylinder piston 902 forward, thereby pushing the lower cylinder push rod 903 upward, causing the lower cylinder top plate 908 and the two screws 17 to move upward, clamping the workpiece between the screws 17 and the top plate 6. At this time, the third spring 904 is compressed, and the second spring 905 is stretched. Simultaneously, the hydraulic oil also pushes the side cylinder piston 703 upward, thereby pushing the side cylinder push rod 704 outward, pushing the side push screw 707 outward, clamping the workpiece between the side push screw 707 and the screw 17 of the side clamping assembly. At this time, the fourth spring 713 is compressed, and the first spring 709 is stretched. Simultaneously, the hydraulic oil pushes the piston rod of the cylinder 3 back, causing the pressure plate and pressure head 19 to move backward, clamping the workpiece between the pressure head 19 and the backing plate 14. This clamps the workpiece in three directions: up, down, front, back, left, and right, providing a good clamping effect and effectively preventing workpiece movement. Furthermore, the clamping force on the workpiece is uniform, preventing deformation of the parts.

[0075] After milling is completed, the oil pressure in the upper oil passage 201 decreases, while the oil pressure in the lower oil passage 202 increases. The lower cylinder push rod 903 falls downwards under its own weight and the tension of the second spring 905, while the lower cylinder piston 902 moves backwards under the thrust of the lower cylinder push rod 903 and the third spring 904. Simultaneously, the side cylinder push rod 704 retracts into the side cylinder body 701 under the tension of the first spring 709, and the side cylinder piston 703 descends under the thrust of the side cylinder push rod 704, the fourth spring 713, and its own weight. At the same time, hydraulic oil enters the rear of the inner cavity of the cylinder 3, pushing the piston rod of the cylinder 3 to extend and release the workpiece. This completes the reset of all clamping components and releases the workpiece from its lock. The operator can then remove the machined workpiece, completing the milling process.

[0076] The embodiments of the invention have been 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 can be made to these embodiments without departing from the principles and spirit of the invention, and these variations still fall within the protection scope of the invention.

Claims

1. A milling fixture for engine connecting rod cover bosses, characterized in that: Includes a base plate (1) and a vertical plate (2) mounted on the base plate (1); the vertical plate (2) is equipped with several hydraulic cylinder assemblies for clamping workpieces from the front and back, an upper clamping assembly for pressing the top of the workpiece, a side clamping assembly for pressing one side of the workpiece, a side hydraulic cylinder clamping assembly (7) for pressing the other side of the workpiece, and a lower hydraulic cylinder clamping assembly (9) for pressing the bottom of the workpiece; the upper end of the base plate (1) is fixedly connected to an oil passage rib (12) and an oil passage block (20); oil passages are provided on the oil passage block (20), the base plate (1), the oil passage rib (12), and the vertical plate (2); an external oil pipe is connected to the oil passage block (20), and then sequentially connects the oil passages of the base plate (1), the oil passage rib (12), and the vertical plate (2), the vertical plate (2) 2) The upper oil passages are respectively connected to the lower oil cylinder clamping assembly (9), the side oil cylinder clamping assembly (7) and the oil cylinder assembly; the upper clamping assembly includes a top plate mounting plate (5) fixedly installed on the vertical plate (2), and a top plate (6) is fixedly installed on the top of the top plate mounting plate (5); a backing plate (14) is installed on the surface of the top plate mounting plate (5); a first rib (11) and a second rib (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 (11), the second rib (16) and the oil passage rib (12); the side clamping assembly includes a side positioning seat (8) fixedly installed on the vertical plate (2); a screw (17) is installed on the side positioning seat (8); The lower cylinder clamping assembly (9) includes a cylinder body (901), a lower cylinder piston (902) movably installed in the inner cavity of the cylinder body (901), and a lower cylinder push rod (903); the side cylinder clamping assembly (7) includes a side cylinder base plate (702) installed on the base plate (1) and a side cylinder body (701) installed on the side cylinder base plate (702); the cylinder assembly includes a plurality of cylinders (3); a pressure plate is fixedly installed at one end of the piston rod of the cylinder (3); a pressure head is installed on one side of the pressure plates located on both sides; a pressure head (19) is installed on one side of the remaining pressure plates.

2. The milling fixture for the engine connecting rod cover boss according to claim 1, characterized in that: The lower cylinder piston (902) and lower cylinder push rod (903) are vertically arranged; the inner cavity of the cylinder body (901) is provided with an annular groove for installing the second spring washer (907), and the upper part of the second spring washer (907) is fixedly connected to the second spring pad (906); the two ends of the second spring (905) are respectively connected to the bottom of the second spring pad (906) and the lower cylinder push rod (903); the bottom of the lower cylinder piston (902) is provided with a groove (9024), and a blind hole (9022) is provided at the center of the bottom of the groove (9024); the lower cylinder piston ( 902) A piston part (9023) is integrally 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) is provided on one side of the lower cylinder push rod (903) and is slidably connected to the protrusion (9021); the lower cylinder push rod (903) extends out of the cylinder body (901) 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 milling fixture for the engine connecting rod cover boss 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 the corresponding position of the lower cylinder push rod (903); a limiting screw for limiting the movement of the lower cylinder push rod (903) is installed on the limiting hole (910).

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

5. The milling fixture for the engine connecting rod cover boss according to claim 4, characterized in that: A third spring (904) is installed between the piston part (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 part of the side cylinder piston (703) and the side wall of the internal chamber of the side cylinder body (701).

6. The milling fixture for the engine connecting rod cover boss according to claim 1, characterized in that: A pad rod is fixed to the side of the pressure plate on both sides where the pressure head (19) is not installed; the pad rod includes a screw rod fixed to the pressure head and a hexagonal bar (10) installed on the screw rod; the hole for installing the pressure head (19) on the pressure plate is a strip hole, and a bolt is inserted into the strip hole and locked with the pressure head (19).

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