Contact Ring for Dual-Path Coaxial Rotary Joint, Its Machining Fixture and Machining Method

Abstract

The present invention discloses a contact ring for a two-way coaxial rotary joint, its processing fixture and processing method. The metal contact ring includes: a circular ring, the inner cavity of which is for the rotor of the two-way coaxial rotary joint to extend upward from the bottom; its upper wall surface contacts the end face of the stator of the two-way coaxial rotary joint; two connecting rods, the upper ends of which are integrally connected to the lower wall surface of the circular ring; an arc-shaped bent plate, arranged coaxially with the circular ring, and the two ends of which are respectively integrally connected to the lower ends of the two connecting rods; a fixing platform is integrally connected to the periphery of the arc-shaped bent plate; a positioning column, arranged vertically, located below the arc-shaped bent plate, and the upper end of which is integrally connected to the fixing platform; the lower end of the positioning column is for extending into the positioning hole of the rotor of the two-way coaxial rotary joint. The metal contact ring of the present invention is an integral contact ring, with simple structure, good rigidity, few processes and no need for heat treatment. The processing method of the present invention reduces the number of clamping and alignment times, thus solving the problems of difficult clamping, easy deformation and unstable quality of the metal contact ring.

Description

Technical Field

[0001] The present invention belongs to the field of microwave components and their processing, and particularly relates to a contact ring for a two-way coaxial rotary joint, its processing fixture and processing method. Background Art

[0002] In a two-way coaxial rotary joint, the metal contact ring is an important part of the two-way coaxial rotary joint. The conductivity and wear resistance of the metal contact ring affect the electrical index performance of the two-way coaxial rotary joint. The accuracy that the metal contact ring can achieve directly affects the index level and product life of the entire system.

[0003] The metal contact ring of the prior art is a split-type circumferential contact type, with a frequency of 0 - 3 GHz, a voltage standing wave ratio ≤ 1.2; and an insertion loss ≤ 0.3 dB.

[0004] Due to the complex structure of the metal contact ring, it is usually of a special shape and a thin-walled part. Therefore, the processing accuracy requirements of the metal contact ring are high, which leads to difficult processing. During the numerical control processing, due to the small size, complex shape and easy deformation of the metal contact ring, the cutting parameters cannot be too large, the processing efficiency is low, and the defective rate of the parts is high.

[0005] The processing method of the metal contact ring of the prior art is as follows: after processing the inner hole with an aluminum bronze rod, it is cut into 6 - 8 split arcs on the circumference by wire cutting, then subjected to a flaring treatment, and then heat-treated to make it elastic. During the use of the two-way coaxial rotary joint, the circumference at the flaring part is in contact with the inner hole of the stator to ensure the transmission of electrical signals. Therefore, the processing method of the metal contact ring of the prior art has complex processes. During the production process, when flaring, due to the poor rigidity after the contact ring is split, it is easy to break, and during the use process, problems such as poor contact are likely to occur. Summary of the Invention

[0006] The purpose of the present invention is to provide a contact ring for a two-way coaxial rotary joint, its processing fixture and processing method, so as to solve the problems that the contact area between the existing metal contact ring and the stator is small, and due to the small size and complex shape of the metal contact ring, it is easy to deform and difficult to clamp during numerical control processing.

[0007] The present invention adopts the following technical solutions: A metal contact ring applicable to a two-way coaxial rotary joint, comprising:

[0008] A circular ring, horizontally arranged, the inner cavity of which is for the rotor of the two-way coaxial rotary joint to extend upward from the bottom; the upper wall surface of which is in contact with the end surface of the stator of the two-way coaxial rotary joint;

[0009] Two connecting rods, vertically arranged, the upper ends of which are integrally connected to the lower wall surface of the circular ring;

[0010] The arc-shaped bent plate is horizontally arranged and coaxially arranged with the ring. Its two ends are integrally connected to the lower ends of two connecting rods respectively. A fixing platform is integrally connected to the periphery of the arc-shaped bent plate.

[0011] The positioning column is vertically arranged and located below the arc-shaped bent plate. Its upper end is integrally connected to the fixing platform. The lower end of the positioning column is used to extend into the positioning hole of the rotor of the double-way coaxial rotary joint.

[0012] Among them, the metal contact ring is used to rotate driven by the rotor of the double-way coaxial rotary joint and maintain the transmission of electrical signals.

[0013] Furthermore, the distances between the fixing platform and the two ends of the arc-shaped bent plate are equal.

[0014] A processing fixture for a metal contact ring applicable to a double-way coaxial rotary joint. The processing fixture includes:

[0015] The cutting positioning platform is horizontally fixed on the milling machine. A flipping groove is opened on its upper wall surface from top to bottom.

[0016] The contact ring fixing flat plate is located above the cutting positioning platform and is horizontally arranged. A bearing groove is horizontally opened on one side wall surface of it from the side wall surface along the upper wall surface of the contact ring fixing flat plate.

[0017] The contact ring positioning flat plate is located above the cutting positioning platform and is horizontally arranged. A receiving groove is horizontally opened on one side wall of it from the side wall surface along the lower wall surface of the contact ring positioning flat plate. The receiving groove and the bearing groove are arranged corresponding to each other and form a receiving cavity. The receiving cavity is used to accommodate and clamp the strip-shaped metal blank, and make the end of the metal blank exposed outside the receiving cavity, so as to facilitate cutting the metal blank to obtain the metal contact ring.

[0018] Among them, the flipping groove is used for: when the exposed part of the metal blank clamped by the contact ring positioning flat plate and the contact ring fixing flat plate arranged from top to bottom in sequence is processed to obtain the lower half section of the metal contact ring, flipping the contact ring positioning flat plate, the contact ring fixing flat plate and the clamped metal contact ring as a whole by 180 degrees, so that the contact ring fixing flat plate is on the top and the contact ring positioning flat plate is on the bottom, which is convenient for reprocessing the exposed part of the metal blank flipped by 180 degrees to obtain the metal contact ring.

[0019] Furthermore, a plurality of first fixing holes for fixing it on the contact ring fixing flat plate are opened on the contact ring positioning flat plate.

[0020] Furthermore, a plurality of second fixing holes for fixing it on the cutting positioning platform are opened on the contact ring fixing flat plate.

[0021] Furthermore, a plurality of third fixing holes for fixing the metal blank in the receiving cavity are opened on the contact ring positioning flat plate.

[0022] A processing method for a metal contact ring applicable to a dual-channel coaxial rotary joint, the processing method comprising:

[0023] Fix the contact ring positioning flat plate and the contact ring fixing flat plate on the cutting positioning platform, and keep the contact ring positioning flat plate on top and the contact ring fixing flat plate below;

[0024] Place the strip-shaped metal blank in the accommodation cavity formed by the bearing groove of the contact ring fixing flat plate and the accommodation groove of the contact ring positioning flat plate, and make the end of the metal blank exposed outside the accommodation cavity;

[0025] Process the upper half of the exposed metal blank to obtain the lower half section of the metal contact ring;

[0026] Flip the contact ring positioning flat plate, the contact ring fixing flat plate, and the processed lower half section of the metal contact ring by 180 degrees, so that the contact ring positioning flat plate is buckled downward into the flipping groove of the cutting positioning platform, and keep the contact ring positioning flat plate below and the contact ring fixing flat plate above. At this time, the upper half section of the processed lower half section of the metal contact ring faces upward;

[0027] After fixing the contact ring positioning flat plate and the contact ring fixing flat plate, process the upper half section of the metal contact ring to obtain the processed metal contact ring.

[0028] The beneficial effects of the present invention are:

[0029] The metal contact ring of the present invention is an integral contact ring. The metal contact ring has a simple structure, good rigidity, few processes, and does not require heat treatment. The upper wall surface of the ring of the metal contact ring contacts the stator end surface of the dual-channel coaxial rotary joint, and the contact area is large, so that the rotor rotates smoothly and has good contact during the rotation process;

[0030] The processing fixture of the present invention can clamp the metal blank stably and ensure that the end of the metal blank is exposed for easy processing; after the lower half section of the metal contact ring is processed, rotate the metal blank by 180 degrees and then process the upper half section of the metal blank. During the whole processing process, the metal blank does not separate from the processing fixture, ensuring the accuracy of the metal contact ring and high processing efficiency;

[0031] The processing method of the present invention can clamp multiple metal blanks at the same time during the processing. After all the lower half sections of the metal contact rings are processed, flip the metal contact rings and then process the upper half sections of the metal contact rings, reducing the number of clamping and alignment times, thus solving the problems of difficult clamping, easy deformation, and unstable quality of the metal contact rings. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of the processing fixture of the present invention clamping the metal blank and processing the lower half section of the metal contact ring;

[0033] Figure 2Schematic diagram of the processing fixture of the present invention clamping a metal blank and processing the upper half of a metal contact ring;

[0034] Figure 3 Schematic diagram of the metal contact ring of the present invention;

[0035] Figure 4 Schematic diagram of the contact ring fixing plate of the present invention;

[0036] Figure 5 Schematic diagram of the contact ring positioning plate of the present invention.

[0037] Wherein: 10, cutting positioning platform; 11, contact ring fixing plate; 12, contact ring positioning plate; 13, flipping groove; 14, metal blank; 20, circular ring; 21, connecting rod; 22, arc-shaped bent plate; 23, fixing table; 24, positioning post; 25, bearing groove; 26, accommodating groove. Detailed implementation manners

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. The "orientation" in the present invention is described based on the orientation of the present invention when it is in the Figure 1 specified state.

[0040] The present invention discloses a metal contact ring applicable to a two-way coaxial rotary joint, as Figure 3 shown, including: a circular ring 20, two connecting rods 21, an arc-shaped bent plate 22, and a positioning post 24.

[0041] The circular ring 20 is horizontally arranged, and the inner cavity of the circular ring 20 is for the rotor of the two-way coaxial rotary joint to extend upward from the bottom; the upper wall surface of the circular ring 20 contacts the end face of the stator of the two-way coaxial rotary joint; the lower wall surface of the circular ring 20 contacts the support ring of the rotor of the two-way coaxial rotary joint; the inner cavity of the circular ring 20 is for the rotor of the two-way coaxial rotary joint to extend upward from the bottom.

[0042] Two connecting rods 21 are arranged vertically, and the upper ends of the two connecting rods 21 are integrally connected to the lower wall surface of the ring 20.

[0043] The arc-shaped bent plate 22 is arranged horizontally, coaxially with the ring 20. The two ends of the arc-shaped bent plate 22 are respectively integrally connected to the lower ends of the two connecting rods 21; a fixing platform 23 is integrally connected to the periphery of the arc-shaped bent plate 22.

[0044] The positioning post 24 is arranged vertically, located below the arc-shaped bent plate 22. The upper end of the positioning post 24 is integrally connected to the fixing platform 23; the lower end of the positioning post 24 is used to extend into the positioning hole of the rotor of the double-way coaxial rotary joint; wherein, the metal contact ring is used to rotate driven by the rotor of the double-way coaxial rotary joint and maintain the transmission of electrical signals.

[0045] The distances between the fixing platform 23 and the two ends of the arc-shaped bent plate 22 are equal.

[0046] The metal contact ring of the prior art is a circumferential contact split-type contact ring. The processability of this kind of metal contact ring is poor, and the minimum size can only be made to Ф15 mm. Therefore, the inner diameter of the stator cavity of the double-way coaxial rotary joint applicable to this kind of metal contact ring can only be Ф15 mm; while due to the good structural rigidity and better processability of the metal contact ring of the present invention, the maximum contour envelope size formed by the ring 20 and the fixing platform 23 can be made to Ф5.9 mm, greatly reducing the inner diameter of the stator cavity of the double-way coaxial rotary joint, so that the frequency of the double-way coaxial rotary joint can be widened, that is, a frequency of 0 - 5 GHZ can be achieved, a voltage standing wave ratio of ≤1.2; an insertion loss of ≤0.2 dB.

[0047] The present invention also discloses a processing fixture for a metal contact ring applicable to a double-way coaxial rotary joint. The processing fixture includes: a cutting positioning platform 10, a contact ring fixing flat plate 11, and a contact ring positioning flat plate 12.

[0048] The cutting positioning platform 10 is horizontally fixed on a milling machine; a flipping groove 13 is opened on the upper wall surface of the cutting positioning platform 10 from top to bottom.

[0049] The contact ring fixing flat plate 11 is located above the cutting positioning platform 10 and is arranged horizontally. As Figure 4 shown, a bearing groove 25 is horizontally opened on one side wall surface of the contact ring fixing flat plate 11 along the upper wall surface of the contact ring fixing flat plate 11.

[0050] The contact ring positioning flat plate 12 is located above the contact ring fixing flat plate 11 and is arranged horizontally. As Figure 5As shown, on one side wall of the contact ring positioning flat plate 12, a receiving groove 26 is horizontally opened from the side wall surface along the lower wall surface of the contact ring positioning flat plate 12; the receiving groove 26 and the bearing groove 25 are arranged corresponding to each other to form a receiving cavity; the receiving cavity is used to receive and clamp the strip-shaped metal blank 14, and the end of the metal blank 14 is exposed outside the receiving cavity, so as to facilitate machining the metal blank 14 to obtain a metal contact ring.

[0051] The flipping groove 13 is used for: when the exposed part of the metal blank 14 clamped by the contact ring positioning flat plate 12 and the contact ring fixing flat plate 11 arranged in sequence from top to bottom is machined to obtain the lower half section of the metal contact ring, flipping the contact ring positioning flat plate 12, the contact ring fixing flat plate 11 and the clamped metal contact ring as a whole by 180 degrees, so that the contact ring fixing flat plate 11 is on the top and the contact ring positioning flat plate 12 is on the bottom, which is convenient for machining the exposed part of the metal blank 14 flipped by 180 degrees again to obtain the metal contact ring.

[0052] A plurality of first fixing holes for fixing the contact ring positioning flat plate 12 to the contact ring fixing flat plate 11 are formed on the contact ring positioning flat plate 12.

[0053] A plurality of second fixing holes for fixing the contact ring fixing flat plate 11 to the cutting positioning platform 10 are formed on the contact ring fixing flat plate 11.

[0054] A plurality of third fixing holes for fixing the metal blank 14 to the receiving cavity are formed on the contact ring positioning flat plate 12.

[0055] The present invention also discloses a processing method for a metal contact ring applicable to a two-way coaxial rotary joint, and the processing method includes:

[0056] As Figure 1 shown, fixing the contact ring positioning flat plate 12 and the contact ring fixing flat plate 11 on the cutting positioning platform 10, and keeping the contact ring positioning flat plate 12 on the top and the contact ring fixing flat plate 11 on the bottom;

[0057] Placing the strip-shaped metal blank 14 into the receiving cavity formed by the bearing groove 25 of the contact ring fixing flat plate 11 and the receiving groove 26 of the contact ring positioning flat plate 12, and making the end of the metal blank 14 exposed outside the receiving cavity;

[0058] Machining the exposed upper half part of the metal blank 14 to obtain the lower half section of the metal contact ring;

[0059] As Figure 2 shown, flipping the contact ring positioning flat plate 12, the contact ring fixing flat plate 11 and the metal contact ring with the lower half section machined by 180 degrees, so that the contact ring positioning flat plate 12 is buckled downward into the flipping groove 13 of the cutting positioning platform 10, and keeping the contact ring positioning flat plate 12 on the bottom and the contact ring fixing flat plate 11 on the top. At this time, the upper half section of the metal contact ring with the lower half section machined faces upward;

[0060] After fixing the contact ring positioning flat plate 12 and the contact ring fixing flat plate 11, the upper half of the metal contact ring is processed to obtain a processed metal contact ring.

[0061] Example 1: Select an aluminum bronze rod with a diameter of 8 mm and a length of 32 mm. After fixing the aluminum bronze rod, mill it into a metal blank 14 with a roughness of 1.6 μm and dimensions of 5 mm × 5.5 mm × 26 mm. Use the contact ring fixing flat plate 11 and the contact ring positioning flat plate 12 to fix the metal blank 14, and then fix the contact ring fixing flat plate 11 and the contact ring positioning flat plate 12 on the cutting positioning platform 10. First, process the lower half of the metal blank 14, then flip the contact ring fixing flat plate 11, the contact ring positioning flat plate 12, and the clamped metal blank 14 by 180 degrees, and extend them into the flipping groove 13 of the cutting positioning platform 10 for fixing. After fixing, process the upper half of the metal blank 14, and then take out the metal contact ring after processing.

[0062] After measurement, the outer diameter of the ring 20 of the processed metal contact ring is 4.3 mm, the inner diameter of the ring 20 is 3.7 mm, the diameter of the connecting rod 21 is 0.5 mm, the height of the connecting rod 21 is 2.7 mm, the distance between the lower wall surface of the arc-shaped bent plate 22 and the lower wall surface of the ring 20 is 2.3 mm; the thickness of the arc-shaped bent plate 22 is 0.3 mm; the inner arc length of the arc-shaped bent plate 22 is 6.11 mm, the outer arc length of the arc-shaped bent plate 22 is 7.05 mm; the inner chord length of the arc-shaped bent plate 22 is 3.69 mm, the outer chord length of the arc-shaped bent plate 22 is 4.29 mm, and the maximum contour envelope size formed by the ring 20 and the fixed platform 23 is Ф5.9 mm; the diameter of the positioning post 24 is 0.5 mm, and the height of the positioning post 24 is 2.7 mm.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A metal contact ring applicable to a dual-channel coaxial rotary joint, characterized in that, Comprising: A circular ring (20), horizontally arranged, the inner cavity of which is for the rotor of the dual-channel coaxial rotary joint to extend upward from the bottom; the upper wall surface thereof contacts the end surface of the stator of the dual-channel coaxial rotary joint; Two connecting rods (21), vertically arranged, the upper ends of which are integrally connected to the lower wall surface of the circular ring (20); An arc-shaped bent plate (22), horizontally arranged, coaxially arranged with the circular ring (20), and the two ends thereof are respectively integrally connected to the lower ends of the two connecting rods (21); a fixing platform (23) is integrally connected to the periphery of the arc-shaped bent plate (22); A positioning column (24), vertically arranged, located below the arc-shaped bent plate (22), the upper end of which is integrally connected to the fixing platform (23); the lower end of the positioning column (24) is for extending into the positioning hole of the rotor of the dual-channel coaxial rotary joint; Wherein, the metal contact ring is used to rotate driven by the rotor of the dual-channel coaxial rotary joint and maintain the transmission of electrical signals; The material of the metal contact ring is aluminum bronze and it is an integral contact ring; The maximum contour envelope size of the metal contact ring is Ф5.9 mm, the frequency band width is 0 - 5GHZ, and the voltage standing wave ratio ≤ 1.2; the insertion loss ≤ 0.2dB.

2. The metal contact ring applicable to a dual-channel coaxial rotary joint according to claim 1, characterized in that, The distances between the fixing platform (23) and the two ends of the arc-shaped bent plate (22) are equal.

3. A processing fixture for a metal contact ring applicable to a dual-channel coaxial rotary joint, characterized in that, The processing fixture is used for clamping the metal contact ring as described in claim 1 or 2, and the processing fixture includes: A cutting positioning platform (10), horizontally fixed on a milling machine; a flipping groove (13) is opened on its upper wall surface from top to bottom; A contact ring fixing flat plate (11), located above the cutting positioning platform (10) and horizontally arranged, and a bearing groove (25) is horizontally opened on one side wall surface thereof from this side wall surface along the upper wall surface of the contact ring fixing flat plate (11); A contact ring positioning flat plate (12), located above the cutting positioning platform (10) and horizontally arranged, and a receiving groove (26) is horizontally opened on one side wall thereof from this side wall surface along the lower wall surface of the contact ring positioning flat plate (12); the receiving groove (26) and the bearing groove (25) are arranged corresponding to each other to form a receiving cavity; the receiving cavity is used for receiving and clamping a strip-shaped metal blank (14) and making the end of the metal blank (14) exposed outside the receiving cavity, so as to facilitate cutting the metal blank (14) to obtain a metal contact ring; Wherein, the flipping groove (13) is used for: when the exposed part of the metal blank (14) clamped by the contact ring positioning flat plate (12) and the contact ring fixing flat plate (11) arranged successively from top to bottom is processed to obtain the lower half section of the metal contact ring, flipping the contact ring positioning flat plate (12), the contact ring fixing flat plate (11) and the clamped metal contact ring as a whole by 180 degrees, so that the contact ring fixing flat plate (11) is on the top and the contact ring positioning flat plate (12) is on the bottom, which is convenient for processing the exposed part of the metal blank (14) flipped by 180 degrees again to obtain a metal contact ring.

4. The processing fixture for a metal contact ring applicable to a dual-channel coaxial rotary joint according to claim 3, characterized in that A plurality of first fixing holes for fixing it to the contact ring fixing flat plate (11) are opened on the contact ring positioning flat plate (12).

5. The processing fixture for a metal contact ring applicable to a dual-channel coaxial rotary joint according to claim 3, characterized in that, A plurality of second fixing holes for fixing it to the cutting positioning platform (10) are opened on the contact ring fixing flat plate (11).

6. The processing fixture for a metal contact ring applicable to a dual-channel coaxial rotary joint according to claim 3, characterized in that, A plurality of third fixing holes for fixing the metal blank (14) in the accommodation cavity are formed in the contact ring positioning flat plate (12).

7. A processing method for a metal contact ring applicable to a dual-channel coaxial rotary joint, characterized in that, The processing method is based on the processing fixture according to any one of claims 3-6, and the processing method includes: Fix the contact ring positioning flat plate (12) and the contact ring fixing flat plate (11) on the cutting positioning platform (10), and keep the contact ring positioning flat plate (12) on the top and the contact ring fixing flat plate (11) on the bottom; Place the strip-shaped metal blank (14) in the accommodation cavity formed by the bearing groove (25) of the contact ring fixing flat plate (11) and the accommodation groove (26) of the contact ring positioning flat plate (12), and make the end of the metal blank (14) exposed outside the accommodation cavity; Machine the upper half of the exposed metal blank (14) to obtain the lower half section of the metal contact ring; Flip the contact ring positioning flat plate (12), the contact ring fixing flat plate (11) and the metal contact ring with the lower half section machined by 180 degrees, so that the contact ring positioning flat plate (12) is buckled downward into the flipping groove (13) of the cutting positioning platform (10), and keep the contact ring positioning flat plate (12) on the bottom and the contact ring fixing flat plate (11) on the top. At this time, the upper half section of the metal contact ring with the lower half section machined faces upward; After fixing the contact ring positioning flat plate (12) and the contact ring fixing flat plate (11), machine the upper half section of the metal contact ring to obtain the machined metal contact ring.

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