Freedom-degree-adjustable pressing device for 3D printing antenna substrate structure

Abstract

The utility model provides a degree-of-freedom-adjustable pressing device for a 3D printing antenna substrate structure. The degree-of-freedom-adjustable pressing device comprises a pressing bush, a separating spring, a pressing end cover, an adjusting block, a pressing rod and a fastening nut. The beneficial effects of the utility model are that the 3D printing base plate is fixedly installed through the threaded interface reserved in the 3D printing base plate, thereby facilitating the later interface change or the replacement of the compression bushing; the pressing end cover is matched with the cambered surface in the adjusting block, so that the pressing rod has the swing freedom degree of + / -1.5 degrees, the requirement for the matching coaxiality of the pressing bushings on the two folded plates can be lowered, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the field of antenna substrate structure compression, in particular to a compression device with adjustable degree of freedom for 3D printing antenna substrate structure. Background Art

[0002] Solar array substrates or phased array antenna substrates on spacecraft usually use aluminum skin honeycomb panels or carbon fiber skin honeycomb panel structures. The overall rigidity of large-sized honeycomb panels is improved by embedding reinforcement beams inside the panels, and the interfaces for installing equipment are provided by embedding parts inside the panels during the production process. All interface embedded parts need to be implemented during the production process of the honeycomb panels, and the foamed rubber filled around the embedded parts is reinforced. In order to ensure the flatness and position requirements of the hinge installation points and the clamping points, post-processing process measures are taken, and the processing allowance is reserved for each interface design in the part state. After the honeycomb panels are formed, the installation points and clamping points are machined.

[0003] Solar panels or phased array antennas usually have multiple folded plates. When they are folded on the same side of the spacecraft, a compression release mechanism is required. Currently, the compression release mechanism adopts a point-through-plate compression structure. Compression bushings are buried between each layer of honeycomb substrate. The compression rods pass through the compression bushings in sequence to compress and fix the multiple folded plates on the spacecraft. Since the compression bushings are pre-buried and glued inside the honeycomb panels, it is difficult to change the interface or replace the compression bushings later.

[0004] At present, the preliminary application of metal 3D printing technology has been realized in the field of aerospace, but it is difficult to realize the embedded operation of honeycomb panels in metal 3D printing. The clamping bushing installed on the 3D printed substrate can only be fixed and installed through the reserved threaded interface, which is convenient for the later interface change or replacement of the clamping bushing. At present, the traditional clamping device used for 3D printed antenna substrate structure cannot adjust the swing freedom of the clamping rod when clamping the two substrates, and there is a high requirement for the coaxiality of the clamping bushing on the two folded plates, which is not conducive to the subsequent release process. Utility Model Content

[0005] In view of this, the utility model aims to propose a clamping device with adjustable degrees of freedom for 3D printed antenna substrate structure, so as to solve the problem in the above-mentioned prior art that the degrees of freedom cannot be adjusted, resulting in high coaxiality requirements for the clamping bushings on the two folded plates.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A clamping device with adjustable degrees of freedom for a 3D printed antenna substrate structure, comprising a clamping bushing, a separation spring, a clamping end cap, an adjustment block, a clamping rod and a fixing nut. One side of the clamping bushing is connected to the 3D printed antenna substrate, a clamping rod is installed inside the clamping bushing, a separation spring is sleeved on the top of the clamping rod, and the separation spring is also located inside the clamping bushing. After the top of the clamping rod passes through the separation spring, a clamping end cap, an adjustment block and a fixing nut are installed in sequence.

[0008] Furthermore, the clamping bushing includes two substrate bushings arranged one above the other, and the two substrate bushings are respectively used to install a 3D printed antenna substrate.

[0009] Furthermore, a first evacuation groove is provided at the top of the base plate bushing on the upper part of the clamping bushing, and the first evacuation groove is used in conjunction with the clamping end cover.

[0010] Furthermore, a first clearance hole is opened in the middle of the clamping end cover, the first clearance hole is used to install the clamping rod, a second clearance groove is opened on the top of the clamping end cover, the second clearance groove is used to install the adjustment block, and a first boss is installed at the bottom of the clamping end cover.

[0011] Furthermore, a second clearance hole is opened in the middle of the adjustment block, and the second clearance hole is used to install the clamping rod. The bottom of the adjustment block is an arc-shaped structure.

[0012] Furthermore, the clamping rod includes a first threaded segment, a second threaded segment, a guide cone structure, a square boss and a rod body. The rod body is a rod-shaped structure, and the two ends of the rod body are respectively a guide cone structure and a second threaded segment. The first threaded segment is installed at the end of the guide cone structure away from the rod body. The first threaded segment is screwed to the slotted bolt of the memory alloy expander, and the second threaded segment is screwed to the locking nut; a square boss is also installed at the end of the second threaded segment.

[0013] Compared with the prior art, the freedom-adjustable clamping device for 3D printing antenna substrate structure described in the utility model has the following advantages:

[0014] The adjustable degree of freedom clamping device for 3D printing antenna substrate structure described in the utility model is fixedly installed through the threaded interface reserved for the 3D printing substrate, which is convenient for later interface changes or replacement of the clamping bushing; the clamping end cover cooperates with the arc surface in the adjustment block so that the clamping rod has a swing freedom of ±1.5°, which can reduce the coaxiality requirements of the clamping bushings on the two folding plates and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of the embodiment of the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of the overall structure according to an embodiment of the utility model installed on two 3D printed antenna substrates;

[0018] Figure 3 This is a schematic diagram of the memory alloy expansion breaker according to an embodiment of the utility model;

[0019] Figure 4 It is a partial cross-sectional schematic diagram of the overall structure of the embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the connection between the separation spring, the adjustment block, the clamping rod and the fixing nut according to an embodiment of the utility model;

[0021] Figure 6 This is a schematic diagram of the clamping rod described in an embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1. Compression bushing; 11. First clearance groove; 2. Separation spring; 3. Compression end cover; 31. First clearance hole; 32. Second clearance groove; 33. First boss; 4. Adjustment block; 41. Second clearance hole; 5. Compression rod; 51. First threaded section; 52. Guide cone structure; 53. Second threaded section; 54. Square boss; 55. Rod body; 6. Set nut; 7. Memory alloy expander; 71. Slotted bolt; 72. Memory alloy metal tube body. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] In the description of the present utility model, 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 utility model 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 a limitation on the present utility model. In addition, the terms "first", "second", etc. 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. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection 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.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0028] like Figure 1-2 As shown, the degree of freedom adjustable clamping device for 3D printed antenna substrate structure includes a clamping bushing 1, a separation spring 2, a clamping end cap 3, an adjustment block 4, a clamping rod 5 and a fixing nut 6. The clamping bushing 1 is connected to the 3D printed antenna substrate. Specifically, the clamping bushing 1 passes through the through holes on the two 3D printed antenna substrates and is fixed to the 3D printed antenna substrates by screws; the clamping rod 5 is located in the clamping bushing 1, and the fixing nut 6 is installed on the upper end of the clamping rod 5. The fixing nut 6 is pressed onto the adjustment block 4, and the positive pressure applied to the support between each plate is generated by the pre-tightening force of the clamping rod 5 to clamp the two 3D printed antenna substrates. The separation spring 2 is located inside the clamping bushing 1, and the top of the separation spring 2 contacts the clamping end cap 3. When the memory alloy expander 7 at the bottom of the clamping bushing 1 is unlocked, the clamping rod 5 pops up with the clamping end cap 3 and the adjustment block 4 under the action of the separation spring 2. The memory alloy expander 7 is a mature shelf product with many successful cases of space application.

[0029] like Figure 3As shown, the memory alloy expansion breaker 7 is a mature shelf product with many successful cases of space application. It is composed of a memory alloy metal tube body 72 and a slotted bolt 71. The slotted bolt 71 is screwed to the clamping rod 5 and applies a certain pre-tightening torque to connect the entire structure together. This is the clamping state; when it needs to be released, the memory alloy metal tube body 72, the memory alloy tube inside it is heated and stretched, and the slotted bolt is pressed until the slotted bolt breaks from its weak point (notch), thereby realizing the separation of the structure.

[0030] Figure 4-5 As shown, it is a schematic diagram of the details of the cooperation between the adjustment block 4 and the clamping end cover 3. After the clamping device is unlocked, each substrate will be released and rotated and unfolded along the unfolding hinge at the root of the substrate. During the assembly and debugging process, the coaxiality of the unfolding hinge must be ensured first to make the substrate unfolding process smooth enough. The accumulated errors during the production and assembly of each substrate will make it difficult to ensure the coaxiality of the two substrate bushings of the clamping bushing 1 (composed of two upper and lower substrate bushings, and the two substrate bushings are used for clamping two substrates respectively), so it is necessary to relax the coaxiality requirements of the clamping device. A first clearance groove 11 is provided on the top of the substrate bushing on the upper part of the clamping bushing 1. The first clearance groove 11 is used in conjunction with the clamping end cover 3 so that the outer part of the clamping end cover 3 can fit tightly with the first clearance groove 11. A first clearance hole 31 is provided in the middle of the clamping end cover 3, and the first clearance hole 31 is used to install the clamping rod 5. A second clearance groove 32 is provided on the top of the clamping end cover 3, and the second clearance groove 32 is used to install the adjustment block 4. A first boss 33 is installed at the bottom of the clamping end cover 3, and the first boss 33 is used to cooperate with the separation spring 2 and can resist the separation spring 2. A second clearance hole 41 is provided in the middle of the adjustment block 4, and the second clearance hole 41 is used to install the clamping rod 5. The bottom of the adjustment block 4 is an arc structure, and the arc structure is used to fit in contact with the second clearance groove 32. The load in the normal direction of the mounting surface of the clamping device is mainly borne by the clamping rod 5. The lower end of the clamping rod 5 needs to be screwed to the memory alloy expander 7, so the coaxiality of the clamping rod 5 and the through hole in the clamping end cover 3 is difficult to ensure. The arc surface matching in the clamping device enables the clamping rod 5 to have a swing freedom of ±1.5°, which can reduce the requirements for the coaxiality of the clamping bushings on the two folding plates.

[0031] Figure 6The clamping rod 5 is a titanium alloy rod-shaped structure, including a first threaded section 51, a second threaded section 53, a guide cone structure 52, a square boss 54 and a rod body 55, with the first threaded section 51 and the second threaded section 53 at both ends. The first threaded section 51 is screwed with the slotted bolt 71 of the memory alloy expander 7, and the second threaded section 53 is screwed with the set nut 6; a square boss 54 is left at the end for easy tool operation; a guide cone structure 52 is left near the first threaded section 51, and the guide cone structure 52 prevents the clamping rod 5 from rebounding. During the process of the clamping rod 5 being ejected, the guide cone structure 52 will pass through the tapered guide hole at the lower end of the upper plate bushing 25, and when the clamping rod 5 rebounds in place, because there is no guiding effect, it is difficult for the guide cone structure 52 to reversely pass through the tapered guide hole at the lower end of the upper plate bushing 25.

[0032] This clamping device can be fixedly installed through the threaded interface reserved in the 3D printing substrate, which is convenient for later interface changes or replacement of the clamping bushing; the arc surface in the clamping device enables the clamping rod to have a swing freedom of ±1.5°, which can reduce the coaxiality requirements of the clamping bushings on the two folding plates; the memory alloy expansion device unlocking solution is adopted. Compared with the traditional pyrotechnic clamping device, this product has the advantages of small unlocking impact, no potential pollution source, no safety risk, can be quickly reset and reused, and has testability.

[0033] Working principle of the free-motion adjustable clamping device for 3D printed antenna substrate structures:

[0034] When the clamping device clamps the two substrates: the first step is to install the memory alloy expander 7 on the satellite platform; the second step is to install the lower substrate bushing of the clamping bushing 1 on the lower substrate, and the upper substrate bushing of the clamping bushing 1 on the upper substrate; the third step is to manually close and clamp the lower substrate and the upper substrate, visually fine-tune the coaxiality of the two substrate bushings of the clamping bushing 1 and the fit of each fitting surface, and after the adjustment is completed, apply full preload to each mounting screw, and observe the smoothness of the unfolding of the lower substrate and the upper substrate during manual release and closing and clamping; the fourth step is to install the separation spring 2, the clamping end cover 3, and the adjustment block 4 in sequence, and the clamping rod 5 passes through the adjustment block 4 and is screwed to the memory alloy expander 7 and uses a tool to operate the square boss 54 on the clamping rod 5 to apply full preload, and then install the fixing nut 6 on the upper end of the clamping rod 5 and apply full preload. At this point, the clamping operation of the clamping device on the lower substrate and the upper substrate is completed, and the release operation of the two substrates can be performed later.

[0035] 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 principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamping device with adjustable degrees of freedom for 3D printing antenna substrate structure, characterized in that: The invention comprises a clamping bushing (1), a separation spring (2), a clamping end cover (3), an adjustment block (4), a clamping rod (5) and a fixing nut (6); one side of the clamping bushing (1) is connected to a 3D printed antenna substrate; a clamping rod (5) is installed inside the clamping bushing (1); the top of the clamping rod (5) is sleeved with the separation spring (2); the separation spring (2) is also located inside the clamping bushing (1); the top of the clamping rod (5) passes through the separation spring (2), and then the clamping end cover (3), the adjustment block (4) and the fixing nut (6) are installed in sequence.

2. The freedom-adjustable clamping device for 3D printing antenna substrate structure according to claim 1, characterized in that: The clamping bushing (1) comprises two substrate bushings arranged one above the other, and the two substrate bushings are respectively used to install a 3D printed antenna substrate.

3. The freedom-adjustable clamping device for 3D printing antenna substrate structure according to claim 1, characterized in that: A first clearance groove (11) is provided at the top of the base plate bushing on the upper part of the clamping bushing (1), and the first clearance groove (11) is used in conjunction with the clamping end cover (3).

4. The freedom-adjustable clamping device for 3D printing antenna substrate structure according to claim 1, characterized in that: A first clearance hole (31) is provided in the middle of the clamping end cover (3), and the first clearance hole (31) is used to install the clamping rod (5). A second clearance groove (32) is provided on the top of the clamping end cover (3), and the second clearance groove (32) is used to install the adjustment block (4). A first boss (33) is installed at the bottom of the clamping end cover (3).

5. The freedom-adjustable clamping device for 3D printing antenna substrate structure according to claim 1, characterized in that: A second clearance hole (41) is provided in the middle of the adjustment block (4), and the second clearance hole (41) is used for installing the pressing rod (5). The bottom of the adjustment block (4) is an arc-shaped structure.

6. The freedom-adjustable clamping device for 3D printing antenna substrate structure according to claim 1, characterized in that: The clamping rod (5) comprises a first threaded section (51), a second threaded section (53), a guide cone structure (52), a square boss (54) and a rod body (55); the rod body (55) is a rod-shaped structure; the two ends of the rod body (55) are the guide cone structure (52) and the second threaded section (53) respectively; the first threaded section (51) is installed at one end of the guide cone structure (52) away from the rod body (55); the first threaded section (51) is screwed to the slotted bolt (71) of the memory alloy expander (7); the second threaded section (53) is screwed to the fixing nut (6); and the end of the second threaded section (53) is also installed with a square boss (54).

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