Miniature pneumatic clamp for realizing stable clamping of aviation fastener in compact environment

Abstract

The invention provides a miniature pneumatic clamp for stably clamping an aviation fastener in a compact environment, which comprises an air cylinder positioning sleeve, a locking nut, an air cylinder sleeve, a clamp body, a wedge block, a mandrel, a clamping jaw sleeve, an air cylinder, a throttle valve and an air pressure sensor, the two clamp bodies are fixed through the mandrel to form a clamping jaw, and the wedge block is in sliding connection with the clamp body; an air cylinder piston rod of the air cylinder is in threaded connection with a fixing wedge block, matched with thread glue for locking and fixed through a locking nut, the upper portion of the air cylinder is fixed through an air cylinder sleeve, the lower portion of the air cylinder is fixed through an air cylinder positioning sleeve, and the air cylinder positioning sleeve is in threaded connection with the air cylinder sleeve. The cylinder is connected with the throttle valve and the air pressure sensor. The invention discloses a miniature pneumatic clamp for realizing stable clamping of aviation fasteners in a compact environment.

Description

Technical Field

[0001] The present invention belongs to the field of process automation integration of aerospace fasteners, and in particular relates to a micro pneumatic clamp for achieving stable clamping of aerospace fasteners in a compact environment. Background Art

[0002] Compared with traditional workpieces, aerospace fasteners have higher assembly accuracy requirements, so in a compact working space, there are also high requirements for the clamping accuracy of aerospace fasteners. However, due to the limited working environment, small space and insufficient light, operators often need to use micro-clamps or robot-assisted tools to perform precise clamping and installation operations.

[0003] At present, traditional pneumatic clamps are large in size and difficult to fit into compact working environments, which limits their installation and operation. Commonly used standard clamps have low adaptability to special-shaped or miniature fasteners and can easily cause workpiece slippage or damage due to insufficient contact area or stress concentration. In addition, most clamps rely on mechanical structure adjustments and lack rapid response capabilities, making them unable to adapt to the frequent switching needs of workpieces of multiple specifications. Summary of the invention

[0004] In view of this, the present invention aims to propose a miniature pneumatic clamp that can achieve stable clamping of aviation fasteners in a compact environment, so as to solve the problem that traditional pneumatic clamps are large in size and difficult to embed into a compact working environment, resulting in limited installation and operation; the commonly used standard clamps have low adaptability to special-shaped or miniature fasteners, and are prone to workpiece slippage or damage due to insufficient contact area or stress concentration; and most clamps rely on mechanical structure adjustment, lack rapid response capabilities, and cannot adapt to the frequent switching needs of workpieces of multiple specifications.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows: The present invention provides a miniature pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment, comprising a cylinder positioning sleeve, a locking nut, a cylinder sleeve, a pliers body, a wedge block, a core shaft, a clamping claw sleeve, a cylinder, a throttle valve, and an air pressure sensor. The two-flange pliers body is fixed to each other by a core shaft to form a clamping claw. The wedge block is slidably connected to the pliers body. The wedge block is threadedly connected to the cylinder piston rod of the cylinder and is used with thread glue to prevent loosening, and is fixed by a locking nut. The upper part of the cylinder is fixed by the cylinder sleeve and the lower part is fixed by the cylinder positioning sleeve. The cylinder positioning sleeve is threadedly connected to the cylinder sleeve, the clamping claw sleeve is threadedly connected to the cylinder sleeve, the cylinder is connected to the throttle valve and the air pressure sensor, and a spring is arranged in the cylinder.

[0006] Furthermore, the pliers body includes a fixed section, a connecting section and a wedge sliding groove section, the fixed section is connected to the wedge sliding groove section through the connecting section, and a V-shaped double-bevel structure is formed as a whole, the fixed section is a fixed groove with a depth of 2 mm, the inner wall of the fixed groove has a surface roughness of Ra0.2μm after polishing, the fixed groove is adapted to the clamping part of the aviation fastener, a semicircular connecting protrusion is provided at the connecting section, the core shaft passes through the semicircular connecting protrusion to fix the two pliers bodies to form a clamp, and the wedge and the wedge sliding groove section are slidably matched.

[0007] Furthermore, the opening angle of the clamp body is .

[0008] Furthermore, the surface of the wedge block and the wedge block sliding groove section in sliding connection is an involute curved surface, the surface of the wedge block is hard chrome plated, the coating thickness is 10 μm, and the surface hardness of the wedge block is HV900.

[0009] Furthermore, the front half of the jaw sleeve is the fixed section of the jaw sleeve, and the rear half is the internal thread section of the jaw sleeve. A positioning pin hole is set on the fixed section of the jaw sleeve. The fixed section of the jaw sleeve and the V-shaped double-bevel structure of the single caliper body are matched with an arc groove. The fixed section of the jaw sleeve is perpendicular to the V-shaped double-bevel structure of the single caliper body and adopts a horizontal groove. The internal thread section of the jaw sleeve is connected to the cylinder sleeve thread.

[0010] Furthermore, the maximum outer diameter of the clamping sleeve of the clamping sleeve is 10 mm.

[0011] Furthermore, the core shaft and the clamping jaw sleeve adopt a transition fit of H7 / g6, and the gap between the core shaft and the inner hole of the clamping jaw sleeve is less than 5 μm.

[0012] Furthermore, the cylinder sleeve comprises an internal thread section of the cylinder sleeve and an external thread section of the cylinder sleeve, the internal thread section of the clamp sleeve is meshed with the external thread section of the cylinder sleeve, and the internal thread section of the cylinder sleeve is fixed to the internal thread end at the top of the cylinder positioning sleeve.

[0013] Compared with the prior art, the micro pneumatic clamp for stably clamping aviation fasteners in a compact environment according to the present invention has the following advantages: The fastener clamping and fixing section of the present invention adopts a modular design, and the fixing groove is adapted to the clamping part of the aviation fastener. During the actual clamping process, fasteners with different head shapes can be quickly replaced, and the clamping contact area of ​​the clamp is increased by more than 40%. The integrated throttle valve and air pressure sensor control the clamping force in real time by adjusting the input air pressure to avoid overload damage to the workpiece.

[0014] The contact surface between the wedge block and the clamping jaws in the present invention is designed as an involute curved surface to reduce sliding friction. The wedge block and the cylinder piston rod are connected by M3 fine thread, and the thread glue is used to prevent loosening. The spring preload in the cylinder can be set through the cylinder positioning sleeve at the end of the cylinder to ensure that the clamping jaws remain closed in the airless state to prevent the workpiece from accidentally falling off. The maximum outer diameter of the clamping sleeve in the present invention is miniaturized and can achieve high-precision clamping in a small space, which is suitable for scenarios such as engine blade tightening and in-machine inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] In the attached picture: Figure 1 It is an isometric schematic diagram of a micro pneumatic clamp for stably clamping aviation fasteners in a compact environment according to an embodiment of the present invention; Figure 2 A schematic front view of a micro pneumatic clamp for stably clamping aviation fasteners in a compact environment according to an embodiment of the present invention; Figure 3 It is a cross-sectional schematic diagram at AA in the front view of the micro pneumatic clamp for stably clamping aviation fasteners in a compact environment according to an embodiment of the present invention; Figure 4 It is a schematic isometric view of a clamp body in a micro pneumatic clamp for stably clamping aviation fasteners in a compact environment according to an embodiment of the present invention; Figure 5 It is an isometric schematic diagram of a wedge block in a micro pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment according to an embodiment of the present invention; Figure 6 A schematic front view of a cylinder sleeve in a micro pneumatic clamp for stably clamping aviation fasteners in a compact environment according to an embodiment of the present invention; Figure 7 This is a schematic isometric view of a clamping jaw sleeve in a micro pneumatic clamp for stably clamping aviation fasteners in a compact environment according to an embodiment of the present invention.

[0017] Description of reference numerals: Cylinder piston rod; 2. Cylinder positioning sleeve; 3. Locking nut; 4. Cylinder sleeve; 5. Clamp body; 6. Wedge; 7. Mandrel; 8. Clamp sleeve; 9. Cylinder; 10. Internal thread section of clamp sleeve; 11. Fixed section; 12. Connecting section; 13. Wedge sliding groove section; 14. Internal thread section of cylinder sleeve; 15. External thread section of cylinder sleeve; 16. Fixed section of clamp sleeve; B. Maximum outer diameter of clamp sleeve. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0022] See also Figure 1-Figure 7 As shown, this embodiment provides a miniature pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment, including a cylinder positioning sleeve 2, a locking nut 3, a cylinder sleeve 4, a pliers body 5, a wedge 6, a core shaft 7, a clamp sleeve 8, a cylinder 9, a throttle valve, and an air pressure sensor. The two-flange pliers body 5 is fixed to each other by the core shaft 7 to form a clamp, the wedge 6 is slidably connected to the pliers body 5, the cylinder piston rod 1 of the cylinder 9 is threadedly connected to fix the wedge 6 and cooperated with thread glue to prevent loosening, and is fixed by the locking nut 3, the upper part of the cylinder 9 is fixed by the cylinder sleeve 4 and the lower part is fixed by the cylinder positioning sleeve 2, the cylinder positioning sleeve 2 is threadedly connected to the cylinder sleeve 4, the clamp sleeve 8 is threadedly connected to the cylinder sleeve, the cylinder 9 is connected to the throttle valve and the air pressure sensor, and a spring is arranged in the cylinder 9.

[0023] The fastener clamping and fixing section adopts a modular design, and the fixing groove is adapted to the clamping part of the aviation fastener. During the actual clamping process, fasteners with different head shapes (such as hexagonal, plum blossom or special-shaped heads) can be quickly replaced. The clamping contact area of ​​the fixture is increased by more than 40%. The integrated throttle valve and air pressure sensor control the clamping force in real time by adjusting the input air pressure to avoid overload damage to the workpiece. The input air pressure range in actual use is 0.2~0.6MPa.

[0024] Specifically, in this embodiment, the pliers body 5 includes a fastener clamping fixed section 11, a connecting section 12 and a wedge sliding groove section 13. The fastener clamping fixed section 11 is connected to the wedge sliding groove section 13 through the connecting section 12, forming a V-shaped double-bevel structure as a whole. The fastener clamping fixed section 11 is a fixed groove with a depth of 2 mm. The surface roughness of the inner wall of the fixed groove after polishing is Ra0.2μm. The fixed groove is adapted to the clamping part of the aviation fastener. A semicircular connecting protrusion is provided at the connecting section 12. The mandrel 7 passes through the semicircular connecting protrusion to fix the two pliers bodies 5 to form a clamping claw. The wedge 6 is slidably matched with the wedge sliding groove section 13. The pliers body is formed by precision wire cutting and a five-axis machining center, and has both lightweight and anti-fatigue characteristics. The fixed groove is adapted to the clamping part of the aviation fastener to ensure surface contact with the workpiece head instead of point contact. By replacing the pliers body, the clamp as a whole can be adapted to multiple types and specifications of aviation fasteners.

[0025] Specifically, in this embodiment, the opening angle of the clamp body 5 is .

[0026] Specifically, in this embodiment, the surface of the wedge block 6 slidingly connected to the wedge block sliding groove section 13 is an involute curved surface, the surface of the wedge block 6 is hard chrome plated, the coating thickness is 10 μm, and the surface hardness of the wedge block 6 is HV900.

[0027] The surface of the wedge block is hard chrome plated with a thickness of 10μm and a hardness of HV900. The contact surface with the clamping jaws is designed as an involute curved surface to reduce sliding friction. The wedge block and the cylinder piston rod are connected with M3 fine thread, and the thread glue (LOCTITE 243) is used to prevent loosening. The stroke adjustment accuracy is ±0.05mm. The manufacturer of the cylinder is SMC, and the model is CJ1B4-5U4 standard cylinder (round). The cylinder positioning sleeve at the tail of the cylinder can be used to set the spring preload in the cylinder to ensure that the clamping jaws remain closed in the airless state to prevent the workpiece from accidentally falling off.

[0028] Specifically, in this embodiment, the front half of the jaw sleeve 8 is the jaw sleeve fixed section 16, and the rear half is the jaw sleeve internal thread section 10. A positioning pin hole is set on the jaw sleeve fixed section 16. The jaw sleeve fixed section 16 and the V-shaped double-bevel structure of the single caliper body 5 are matched with an arc groove. The jaw sleeve fixed section 16 is perpendicular to the V-shaped double-bevel structure of the single caliper body 5 and a horizontal groove is used. The jaw sleeve internal thread section 10 is threadedly connected to the cylinder sleeve 4.

[0029] Specifically, in this embodiment, the maximum outer diameter B of the clamping sleeve of the clamping sleeve 8 is 10 mm. The maximum outer diameter of the clamping sleeve can be miniaturized to achieve high-precision clamping in a small space, which is suitable for engine blade fastening, in-machine inspection and other scenarios.

[0030] Specifically, in this embodiment, the core shaft 7 and the clamping jaw sleeve 8 adopt a transition fit of H7 / g6, and the gap between the core shaft 7 and the inner hole of the clamping jaw sleeve 8 is less than 5 μm.

[0031] Specifically, in this embodiment, the cylinder sleeve 4 includes a cylinder sleeve internal thread section 14 and a cylinder sleeve external thread section 15. The clamp sleeve internal thread section 10 is meshed with the cylinder sleeve external thread section 15. The cylinder sleeve internal thread section 14 is fixed to the internal thread end at the top of the cylinder positioning sleeve 2.

[0032] The micro pneumatic clamp positions the two-piece clamp body by holding the clamp sleeve and the mandrel, and the single-acting cylinder pushes the wedge to move the clamp to complete the clamping. When the micro pneumatic clamp needs to be released, the single pair of cylinders releases the pressure, and the clamp is opened by the spring to complete the release of the workpiece.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment, characterized in that: The invention comprises a cylinder positioning sleeve (2), a locking nut (3), a cylinder sleeve (4), a caliper body (5), a wedge block (6), a core shaft (7), a clamping jaw sleeve (8), a cylinder (9), a throttle valve, and an air pressure sensor. The two halves of the caliper body (5) are fixed to each other through the core shaft (7) to form a clamping jaw. The wedge block (6) is slidably connected to the caliper body (5). The cylinder piston rod (1) of the cylinder (9) is threadedly connected to fix the wedge block (6) and cooperates with thread glue to prevent loosening, and is fixed through the locking nut (3). The upper part of the cylinder (9) is fixed by the cylinder sleeve (4) and the lower part is fixed by the cylinder positioning sleeve (2). The cylinder positioning sleeve (2) is threadedly connected to the cylinder sleeve (4). The clamping jaw sleeve (8) is threadedly connected to the cylinder sleeve (4). The cylinder (9) is connected to the throttle valve and the air pressure sensor. A spring is arranged inside the cylinder (9).

2. The micro pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment according to claim 1, characterized in that: The pliers body (5) comprises a fastener clamping and fixing section (11), a connecting section (12) and a wedge sliding groove section (13); the fastener clamping and fixing section (11) is connected to the wedge sliding groove section (13) via the connecting section (12), forming a V-shaped double-bevel structure as a whole; the fastener clamping and fixing section (11) is a fixing groove with a depth of 2 mm; the inner wall of the fixing groove has a surface roughness of Ra0.2 μm after polishing; the fixing groove is adapted to the clamping position of the aviation fastener; a semicircular connecting protrusion is provided at the connecting section (12); the mandrel (7) passes through the semicircular connecting protrusion to fix the two pliers bodies (5) to form a clamping jaw; the wedge (6) is slidably matched with the wedge sliding groove section (13).

3. According to the miniature pneumatic clamp for stably clamping aviation fasteners in a compact environment as described in claim 2, the opening angle of the clamp body (5) is .

4. The micro pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment according to claim 1, characterized in that: The surface of the wedge block (6) and the wedge block sliding groove section (13) in sliding connection is an involute curved surface. The surface of the wedge block (6) is hard chrome plated with a coating thickness of 10 μm. The surface hardness of the wedge block (6) is HV900.

5. The micro pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment according to claim 1, characterized in that: The front half of the clamping sleeve (8) is a clamping sleeve fixed section (16), and the rear half is a clamping sleeve internal thread section (10). A positioning pin hole is set on the clamping sleeve fixed section (16). The clamping sleeve fixed section (16) and the V-shaped double-bevel structure of the single clamp body (5) are matched with an arc groove. The clamping sleeve fixed section (16) is perpendicular to the V-shaped double-bevel structure of the single clamp body (5) and is matched with a horizontal groove. The clamping sleeve internal thread section (10) is threadedly connected to the cylinder sleeve (4).

6. The micro pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment according to claim 4, characterized in that: The maximum outer diameter (B) of the clamping jaw sleeve (8) is 10 mm.

7. The micro pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment according to claim 1, characterized in that: The core shaft (7) and the clamping jaw sleeve (8) adopt a transition fit of H7 / g6, and the gap between the core shaft (7) and the inner hole of the clamping jaw sleeve (8) is less than 5 μm.

8. The micro pneumatic clamp for achieving stable clamping of aviation fasteners in a compact environment according to claim 1, characterized in that: The cylinder sleeve (4) comprises a cylinder sleeve internal thread section (14) and a cylinder sleeve external thread section (15). The clamp sleeve internal thread section (10) and the cylinder sleeve external thread section (15) are meshed, and the cylinder sleeve internal thread section (14) is fixed to the internal thread end at the top of the cylinder positioning sleeve (2).

Images