A stable self-clamping module for automatic feeding and drilling holes on the edge of structural parts

Abstract

The present invention belongs to the field of processing equipment, and discloses a stable self-clamping module for realizing automatic feed drilling of holes on the edge of a structural part, comprising a main body and a transmission clamping mechanism. The main body comprises a C-shaped clamp guide cylinder and a clamp body, the C-shaped clamp guide cylinder is used to connect the automatic feed drill, and the clamp body is used to connect the C-shaped clamp guide cylinder and the transmission clamping mechanism; the transmission clamping mechanism is driven by a cylinder, and the end of its connecting rod mechanism is connected to a hollow screw, which works together with the C-shaped clamp guide cylinder to achieve clamping of the workpiece. The present invention is integrated with the automatic feed drill, and realizes the rapid and stable clamping of the automatic feed drill on the edge of the structural part by self-clamping. While improving the flexibility and clamping efficiency of the automatic feed drill, it effectively solves the problems of poor processing quality stability caused by the difficulty of general clamps in holding and effectively supporting, the high cost of special clamps, and insufficient rigidity of the edge position of the structural part.

Description

Technical Field

[0001] The invention belongs to the field of processing equipment and relates to a stable self-clamping module for realizing automatic feeding and drilling of holes on the edge of a structural part. Background Art

[0002] During the connection process of structural components in aviation equipment, a large number of connection holes need to be machined at the edges. Using an automatic feed drill to drill holes in such areas is currently the mainstream method for high-quality and efficient production internationally. However, some of these areas have complex structures, making it difficult for general-purpose fixtures to effectively support them, requiring the manufacture of specialized fixtures, which is costly. Some areas also have weak rigidity, making them prone to deformation and vibration during processing, which can easily lead to quality problems such as out-of-tolerance hole diameters. Therefore, it is necessary to develop a stable self-clamping module that can realize automatic feed drilling of holes at the edges of structural components, so that hole processing can be performed independently of external fixtures and unaffected by the overall weak rigidity.

[0003] Research on self-clamping modules for automated feed drilling of structural component edges began early abroad, and several companies now offer similar products on the market. For example, the C-shaped edge clamping module from the French company Desoutter uses a pneumatically driven rocker arm to rotate and open. The end of the rocker arm clamps the workpiece against a tool guide, simplifying clamping operations and improving efficiency. However, most domestic research on fixtures for drilling holes in structural component edges has not been geared toward adapting them to automated feed drilling. Huang Qiang and others from Xi'an Xihang Group Wright Aerospace Manufacturing Technology Co., Ltd. invented "An Auxiliary Support for Machining Thin-Walled Part Edges and Holes," patented with patent number 201820625644.3. By incorporating a support half-ring at the part edge, the device effectively improves the rigidity of thin-walled parts, controls the clearance between the part and the auxiliary support, resolves the problem of uneven force distribution between the auxiliary support and the part, and controls deformation of the part edge and hole after machining. However, the device is only suitable for drilling holes on the edges of large circular workpieces, lacking versatility and making it difficult to effectively clamp complex or diverse workpieces. Chen Guoxing and others from the Liuzhou No. 2 Machine Tool Factory in Guangxi invented "a method for effectively processing multi-end arcs of unequal length on the edges of thin-walled parts." The patent number is 201810449145.8. The method uses a nut to lock the clamping plate to prevent deformation of the workpiece edge. It can achieve stable clamping and hole-making processing for thin-walled workpieces, but its clamping and releasing operations are cumbersome and complicated, requiring a lot of manual operation, and are inefficient.

[0004] In summary, in order to meet the needs of high-quality and efficient automatic feed drilling for the edge position of structural parts, it is necessary to develop a stable self-clamping module that can realize automatic feed drilling of structural parts edges with compact structure, stable clamping, simple operation and guaranteed processing efficiency and processing quality. Summary of the Invention

[0005] Based on the demand for high-quality and efficient processing of the edge position of structural parts by automatic feed drills, the present invention has developed a stable self-clamping module for realizing automatic feed drilling of holes on the edge of structural parts. The device comprises a guide cylinder, a transmission clamping mechanism and a fixture body. The device is connected to the automatic feed drill through a guide sleeve, and the transmission clamping mechanism transmits the cylinder force to the screw through a connecting rod mechanism, providing clamping force to the edge of the structural part, wherein the rocker arm is always located near the dead point when rotating, so that the rocker arm can only be driven in one direction, ensuring that it will not fall off after clamping due to excessive axial force for hole making; a parallelogram structure is formed between the rocker arm and the screw, which ensures that the screw axis is always parallel to the C-shaped fixture guide cylinder, so that the clamping force is always parallel to the axial force for hole making, reducing the bending moment load caused by eccentricity and further ensuring the stability of the clamping.

[0006] The technical solution of the present invention:

[0007] A stable self-clamping module for realizing automatic feeding and drilling of holes on the edge of a structural part, comprising a main body and a transmission clamping mechanism;

[0008] The main body includes a C-shaped clamp guide cylinder, a bolt, and a clamp body. A guide hole and a threaded hole are provided on the upper portion of the clamp body. The C-shaped clamp guide cylinder passes through the guide hole on the clamp body and is connected to the clamp body via a bolt. A mounting hole is pre-set at the bottom of the clamp body for connecting to the cylinder.

[0009] The transmission clamping mechanism includes hinge pin 1, hinge pin 4, rocker arm protective cover, rocker arm connection fixed support, cylinder connector, bolt 2, bolt 3, hinge pin 2, force transmission connector, thrust needle roller bearing 1, base connector, rocker arm connector, hinge pin 5, hinge pin 3, rocker arm mirror protective cover, bolt 4, rocker arm, thrust needle roller bearing 2, serrated screw, hinge pin 6, hinge pin 7, screw connector, oil-free bushing 1, bolt 5, parallelogram connecting rod, screw front The upper part of the end of the fixture body is provided with a positioning structure, the cross section of the rocker arm connection fixed support is an L-shaped structure, and a positioning circular hole is provided on its horizontal surface. The rocker arm connection fixed support is connected to the fixture body through the positioning circular hole and the bolt 2; the vertical surface of the rocker arm connection fixed support is provided with a splint structure, the splint structure is provided with a hole, the base connector is provided with a right hole and a left hole, and the hinge pin 8 is realized through the hole on the splint structure and the left hole. The base connecting piece is connected to the splint structure and is fixed by a retaining spring to achieve hinged connection; a reinforcing rib is provided on the vertical surface of the rocker arm connecting and fixing support, and a circular hole two is provided on the reinforcing rib, and the rocker arm includes an upper double ear piece structure and a lower double ear piece structure, and the upper double ear piece structure has two corresponding sets of upper holes one and upper holes two, and the lower double ear piece structure has a set of lower holes, and the oil-free bushing two is installed on the upper hole one, and a thrust needle roller bearing two is installed between the rocker arm and the rocker arm connecting and fixing support, and the hinge pin four and the bolt six are hinged through the upper hole one and the circular hole two to achieve hinged connection; another circular hole one is provided on the reinforcing rib of the rocker arm connecting and fixing support, and a through hole for the parallelogram connecting rod to pass through is provided above the reinforcing rib, and a hole corresponding to the circular hole one is opened on the parallelogram connecting rod, and the hinge pin one is connected to the parallelogram connecting rod and the rocker arm connecting and fixing support through the circular hole one and the hole on the parallelogram connecting rod, and is fixed by a retaining spring to achieve hinged connection; threaded holes are provided around the rocker arm connecting and fixing support;

[0010] The force transmission connector is provided with hole two, hole three of the rocker arm connector and the right hole on the base connector correspond to the hole two, two thrust needle roller bearings are installed between the rocker arm connector and the force transmission connector, and a thrust needle roller bearing one and a gasket are installed between the two base connectors and the force transmission connector respectively, and the above-mentioned connections are connected to bolt three through hinge pin five to form a composite hinge structure; the cylinder connector is a double-ear structure, with a mounting hole provided at its bottom, which is connected to the cylinder through mounting bolts adapted to the cylinder; hole one on the force transmission connector corresponds to the hole on the double-ear structure of the cylinder connector, and the two are connected through hinge pin two to form a hinge, and are fixed by a retaining spring;

[0011] A pin hole is provided on the lead screw connecting piece, and the lower hole of the rocker arm corresponds to it. An oil-free bushing is installed inside the pin hole of the lead screw connecting piece. The lower hole of the rocker arm and the pin hole of the lead screw connecting piece are hingedly installed on the lower hole and the pin hole through bolt five to form a hinge; the lead screw connecting piece is provided with a hole five, and the other side hole of the parallelogram connecting rod corresponds to it. Hinge pin seven is hinged with the hole five of the lead screw connecting piece and the hole of the parallelogram connecting rod and is fixed by a retaining spring; a serrated threaded hole is provided inside the lead screw connecting piece, and the serrated lead screw external thread corresponds to it, and the two form a threaded fit; a serrated threaded hole is provided at the front end of the lead screw, and the serrated lead screw external thread corresponds to it, and the two form a threaded fit; three threaded holes are provided on the side of the front end of the lead screw, and the rubber gasket is a circular ring structure with a flange, and three countersunk holes are provided on its side, corresponding to the threaded holes at the front end of the lead screw, and the two are connected by bolts;

[0012] There are threaded holes around the rocker arm connection and fixed support, and holes are provided on the rocker arm protection cover and the rocker arm mirror protection cover. The rocker arm protection cover and the rocker arm mirror protection cover are installed on both sides of the rocker arm connection and fixed support, and the holes on them correspond to the threaded holes. The rocker arm protection cover and the rocker arm mirror protection cover are respectively connected to the rocker arm connection and fixed support by bolt four.

[0013] The beneficial effects of the present invention are as follows: the present invention provides a stable self-clamping module for realizing automatic feed drilling of holes on the edge of a structural part. The cylinder force is transmitted to the screw through a four-bar linkage and a parallelogram linkage, providing a large clamping force on the edge of the structural part, and realizing stable self-clamping of the edge of the structural part by the automatic feed drill. The parallelogram linkage and the rocker arm are connected to the rocker arm through a pin shaft and a fixed support, and form a parallelogram linkage with the screw connector, ensuring that the axis of the serrated screw is always parallel to the axis of the C-shaped clamp guide cylinder 1. In the clamping state, the four-bar linkage composed of the force transmission connector, the base connector, the rocker arm connector, and the rocker arm is close to the dead point position, making the clamping more reliable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 An exploded schematic diagram of a stable self-clamping module for automatically feeding and drilling holes in the edge of a structural part according to the present invention;

[0015] Figure 2 A cross-sectional view of a stable self-clamping module for automatically feeding and drilling holes on the edge of a structural member according to the present invention;

[0016] Figure 3 Detailed structural diagram of some parts of the stable self-clamping module for realizing automatic feeding and drilling of holes on the edge of a structural part according to the present invention;

[0017] Figure 4 A schematic diagram of the processing of a stable self-clamping module for automatically feeding and drilling holes in the edge of a structural part according to the present invention;

[0018] Figure 5 This is a schematic diagram of the structure of the rocker arm connecting and fixing support parts of the present invention;

[0019] Figure 6 This is a schematic diagram of the structure of the cylinder connection parts of the present invention;

[0020] Figure 7 This is a schematic diagram of the base connection parts structure of the present invention;

[0021] Figure 8 This is a schematic diagram of the rocker arm connecting parts structure of the present invention;

[0022] Figure 9 This is a schematic diagram of the structure of the rocker arm parts of the present invention;

[0023] Figure 10 This is a schematic diagram of the structure of the screw connector parts of the present invention.

[0024] In the figure: 1-C-shaped clamp guide cylinder, 2-bolt 1, 3-clamp body, 4-hinge pin 1, 5-hinge pin 4, 6-rocker arm protection cover, 7-rocker arm connection fixed support, 8-cylinder connector, 9-bolt 2, 10-bolt 3, 11-hinge pin 2, 12-force transmission connector, 13-thrust needle roller bearing 1, 14-base connector, 15-rocker arm connector, 16-hinge pin 5, 17-hinge pin 3, 18-rocker arm mirror protection cover, 19-bolt 4, 20-rocker arm, 21-thrust needle roller bearing 2, 22-serrated screw, 23-hinge pin 6, 24-hinge pin 7, 25-screw Connecting parts, 26-oil-free bushing one, 27-bolt five, 28-parallelogram connecting rod, 29-front end of the screw, 30-rubber gasket, 31-oil-free bushing two, 32-hinge pin eight, 33-bolt six, 34-automatic feed drill, 35-workpiece to be processed, 7a-threaded hole, 7b-plywood structure, 7c-circular hole one, 7d-circular hole two, 7e-positioning circular hole, 12a-hole one, 12b-hole two, 14a-right hole, 14b-left hole, 15a-hole three, 15b-hole four, 20a-upper hole one, 20b-upper hole two, 20c-lower hole, 25a-pin hole, 25b-hole five. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0026] refer to Figures 1 to 10 , a stable self-clamping module for automatically feeding and drilling holes on the edge of a structural part, comprising:

[0027] like Figure 1The present invention provides a stable self-clamping module for realizing automatic feeding and drilling of holes on the edge of a structural part, and the device includes a C-shaped clamp guide cylinder 1, a bolt 2, a clamp body 3, a hinge pin 1 4, a hinge pin 4 5, a rocker arm protective cover 6, a rocker arm connecting fixed support 7, a cylinder connecting part 8, a bolt 2 9, a bolt 3 10, a hinge pin 2 11, a force transmission connecting part 12, a thrust needle roller bearing 1 13, a base connecting part 14, a rocker arm connecting part 15, a hinge pin 5 16, a hinge pin 3 17, a rocker arm mirror protective cover 18, a bolt 4 19, a rocker arm 20, a thrust needle roller bearing 2 21, a serrated screw 22, a hinge pin 6 23, a hinge pin 7 24, a screw connecting part 25, an oil-free bushing 1 26, a bolt 5 27, a parallelogram connecting rod 28, a screw front end 29, a rubber gasket 30, an oil-free bushing 2 31, a hinge pin 8 32 and a bolt 6 33.

[0028] In this embodiment, bolt 12 passes through the internal threaded hole of the clamp body 3 and is connected to the C-shaped clamp guide cylinder 1; the rocker arm connection fixed support 7 is connected to the clamp body 3 by bolt 29; the base connector 14 is hinged to the rocker arm connection fixed support 7 through hinge pin 8 32 and fixed by a retaining spring; the parallelogram connecting rod 28 is hinged to the rocker arm connection fixed support 7 through hinge pin 14 and fixed by a retaining spring; the rocker arm 20 is connected to the rocker arm connection fixed support 7 through oil-free bushing 2 31, Hinge pin four 5, bolt six 33 form a hinge, fixed by bolt five 27; rocker arm connector 15 and rocker arm 20 are hinged by hinge pin three 17 and thrust needle roller bearing two 21, fixed by a retaining spring; a gasket and a thrust needle roller bearing one 13 are installed between the base connector 14 and the force transmission connector 12, and two thrust needle roller bearings are installed between the force transmission connector 12 and the rocker arm connector 15. The force transmission connector 12, gasket, thrust needle roller bearing one 13, and rocker arm connector 15 are connected. The hinge pin 5 16 forms a composite hinge structure and is connected by a bolt 3 10; the cylinder connector 8 is pre-connected to the cylinder by bolts, and is hinged to the force transmission connector 12 by a hinge pin 11; the screw connector 25 is hinged to the rocker arm 20 by a hinge pin 6 23, an oil-free bushing 1 26, and a thrust needle roller bearing 21, and is fixed by a bolt 5 27; the parallelogram connecting rod 28 is connected to the screw connector 25 by a hinge pin 7 24 and a retaining spring. The lines connecting the two hinge holes of the serrated connecting rod 28 and the two hinged upper holes 20a and lower holes 20c of the rocker arm 20 form a parallelogram, which ensures that the axis of the screw connector 25 is always horizontal during the clamping movement; the serrated screw 22 is screwed into the screw connector 25 and the front end 29 of the screw in turn; the rubber gasket and the front end of the screw are bolted together through the side threaded holes; the rocker arm protection cover 6 and the rocker arm mirror protection cover 18 are connected to the rocker arm connection fixed support 7 through bolt 4 19.

[0029] During operation, the cylinder provides power, driving the cylinder connector 8 upward. This telescopic motion of the cylinder is converted into circular motion of the rocker arm 20 around the fixed pin A5 through a linkage mechanism comprised of the force-transmitting connector 12, the base connector 14, the rocker arm connector 15, and the rocker arm 20, thereby generating circular motion of the rocker arm 20. When the rocker arm 20 rotates at a 0° angle (i.e., when the line connecting the upper hole 20a and the lower hole 20c in the rocker arm 20 is perpendicular to the axis of the fixture guide cylinder 1), the four-bar linkage is at its dead center. The rocker arm 20 remains near this dead center during rotation, thus achieving a labor-saving effect. The parallelogram structure formed by the parallelogram connecting rod 28, the rocker arm 20, the screw connector 25, and the rocker arm connection and fixed support 7 ensures that the screw axis remains parallel to the C-shaped fixture guide cylinder, thereby ensuring a close fit with the clamping surface.

[0030] In this embodiment, the screw connector 25 is internally threaded, and the serrated screw 22 reciprocates along its axis. The screw engagement distance can be adjusted depending on the material being processed, and the screw is secured with a jackscrew. A hollow fluororubber gasket is mounted at the front end of the screw, increasing friction with the workpiece surface and ensuring more stable clamping.

Claims

1. A stable self-clamping module for automatically feeding and drilling holes on the edge of a structural part, characterized in that: The stable self-clamping module for automatically feeding and drilling holes on the edge of a structural part comprises a main body and a transmission clamping mechanism; the main body comprises a C-shaped clamp guide cylinder and a clamp body; a guide hole is provided on the upper portion of the clamp body, and the C-shaped clamp guide cylinder passes through the guide hole on the clamp body and is connected to the clamp body; the clamp body is connected to a cylinder; A positioning structure is provided at the upper end of the fixture body. The cross-section of the rocker arm connection fixed support is an L-shaped structure, and its horizontal surface is connected to the fixture body. A splint structure is provided on the vertical surface of the rocker arm connection fixed support. The splint structure is connected to the base connector and fixed by a retaining spring to achieve hinged connection. A reinforcing rib is provided on the vertical surface of the rocker arm connection fixed support. The rocker arm includes an upper double ear piece and a lower double ear piece. Two thrust needle roller bearings are installed between the upper double ear piece of the rocker arm and the rocker arm connection fixed support. The reinforcing rib of the rocker arm connection fixed support is connected to the parallelogram connecting rod to achieve hinged connection. The rocker arm connector and the rocker arm are hinged via hinge pin 3 and thrust needle roller bearing 2, and fixed via a retaining spring; two thrust needle roller bearings are installed between the rocker arm connector and the force transmission connector, and a thrust needle roller bearing 1 and a gasket are installed between the two base connectors and the force transmission connector respectively, forming a composite hinge structure; the cylinder connector is a double-ear structure, the bottom of which is connected to the cylinder; the double-ear structure of the cylinder connector is connected to the force transmission connector to form a hinge; The screw connector is provided with a pin hole for installing an oil-free bushing. The lower double ear piece of the rocker arm is connected to the screw connector to form a hinge. The screw connector and the parallelogram connecting rod are hinged by a hinge pin. The screw connector has a serrated threaded hole inside, and the serrated screw external thread corresponds to it, and the two form a threaded fit. The front end of the screw is provided with a serrated threaded hole, which corresponds to the serrated screw external thread, forming a threaded fit. The rubber gasket is a circular ring structure with a flange, which is connected to the front end of the screw. The rocker arm protection cover and the rocker arm mirror protection cover are installed on both sides of the rocker arm connection fixing support, and the rocker arm protection cover and the rocker arm mirror protection cover are respectively connected to the rocker arm connection fixing support.

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