An assembly method for a multi-channel waveguide rotary joint for multi-faceted mounting

Abstract

The present application relates to the field of microwave parts assembly, in particular to a kind of assembly method for multi-channel waveguide rotary joint of multi-surface installation. After the assembly of joint and mechanism or structure is completed using the method provided by the present application, the residual assembly stress is small, which is insufficient to affect the performance of the joint. At the same time, the method solves the problem of the influence of the assembly stress of the multi-channel waveguide rotary joint and other parts after assembly on the isolation degree between the multiple channels of the joint, and has the advantages of simplicity, efficiency, operability and strong reference value. It has high reference significance for the assembly of other high-precision parts.

Description

Technical Field

[0001] This invention relates to the field of microwave component assembly, and more specifically to an assembly method for a multi-channel waveguide rotary joint with multi-faceted mounting. Background Technology

[0002] Rotary joints are core components that ensure continuous motion in structures or mechanisms, such as the rotary joints in solar panel deployment mechanisms and satellite deployable antenna deployment mechanisms in the aerospace field. The performance of the rotary joints directly determines whether the entire structural system can function properly. Waveguide rotary joints, in addition to ensuring normal rotational movement of the structure or mechanism, must also guarantee reliable microwave signal transmission. To support the transmission of multiple microwave signals, multi-channel waveguide rotary joints are often required. Multi-channel rotary joints are formed by concentrically stacking or nesting multiple single-channel or multi-channel rotary joints. In recent years, with the continuous development of microwave communication technology and artificial intelligence technology, the application of waveguide rotary joints has become increasingly widespread.

[0003] Multi-channel rotary joints involve multiple mounting surfaces during interconnection with structures or mechanisms. Due to limitations in existing machining and assembly processes, the distance between the joint flange surface and the central axis varies, and it is difficult to ensure a clearance-free fit between the joint flange surface and the mounting surface of the structure or mechanism. Therefore, significant assembly stress exists during the assembly of the joint with the structure or mechanism. This assembly stress varies with the rotation angle during joint rotation, affecting the shape of the microwave signal transmission channel inside the joint and consequently the stability of the transmitted microwave signal, especially for millimeter-wave signals, which are more sensitive to changes in the transmission channel shape. Therefore, previous methods for assembling multi-channel rotary joints with structures or mechanisms often employed a "test, adjust, and tighten simultaneously" approach. This method requires multiple operators working simultaneously and necessitates various testing devices, resulting in high randomness, low efficiency, and an inability to guarantee the consistency of the joint's state on the structure or mechanism. Therefore, a stress-free assembly method for multi-channel waveguide rotary joints with structures or mechanisms is crucial for ensuring the stability of system signal transmission. Summary of the Invention

[0004] The purpose of this invention is to provide an assembly method for a multi-channel waveguide rotary joint with multiple surfaces, so as to solve the problem of the influence of assembly stress on the isolation between the multiple channels of the joint after the multi-channel waveguide rotary joint is assembled with other components. At the same time, it simplifies the use of instruments and equipment and operators during the assembly process and improves work efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution, comprising the following steps:

[0006] S1: Under the influence of gravity alone, the joint flange surface is fitted to the first bracket mounting surface, and a feeler gauge is used to confirm the gap between the joint flange surface and the first bracket mounting surface in this state.

[0007] S2: Based on the gap size confirmed in S1, place a compensation shim of the existing size between the corresponding joint flange surface and the first bracket mounting surface, and connect the joint flange surface and the first bracket mounting surface together with fasteners, leaving a gap of 1 to 2 mm between the two surfaces.

[0008] S3: Place the joint in an inverted position, so that it is subjected only to its own weight G and the tension F provided by the fastener in the vertical direction. Then, by repeatedly and evenly pre-tightening and tightening the fasteners connecting the joint and the first bracket, the installation of the flange surface of the joint and the first bracket is completed.

[0009] S4: Install the first bracket together with the joint at the corresponding working part of the mechanism or structure;

[0010] S5: Install the second bracket, which is interconnected with other flange surfaces of the joint, at the corresponding working part of the mechanism or structure. Do not lock all fasteners connecting the second bracket and the mechanism or structure to ensure that the second bracket has a certain amount of room to move in that position.

[0011] S6: Adjust the position of the second bracket, and at the same time use a feeler gauge to test so that the gap between the mounting surface of the second bracket and the corresponding joint flange surface is the same as the size of the existing compensation gasket, and tighten the fasteners connecting the second bracket to the mechanism or structure.

[0012] S7: Insert the existing size compensation shim between the joint flange face and the second bracket mounting face, and connect the two with fasteners;

[0013] S8: Repeat S5, S6 and S7 to install the other flange faces of the joint onto other brackets to be installed, completing the assembly of the multi-channel waveguide rotary joint with the mechanism or structure.

[0014] The beneficial effects of this invention are as follows: after assembling a joint with a mechanism or structure using the method provided by this invention, the residual assembly stress is minimal and insufficient to affect the joint performance. Simultaneously, this method solves the problem of the impact of assembly stress on the isolation between the multiple channels of a multi-channel waveguide rotary joint after assembly with other components. It also has advantages such as simplicity, efficiency, operability, and strong reference value, and has high reference value for the assembly of other high-precision components. Attached Figure Description

[0015] Figure 1 This is a flowchart of the method of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the four-channel waveguide rotary joint in Embodiments 1 and 2 of the present invention. Figure 1 ;

[0017] Figure 3 This is a schematic diagram of the structure of the four-channel waveguide rotary joint in Embodiments 1 and 2 of the present invention. Figure 2 ;

[0018] Figure 4 This is a schematic diagram of the structure after the four-channel waveguide rotary joint and the test fixture are mechanically interconnected in Embodiment 1 of the present invention;

[0019] Figure 5 This is a structural diagram corresponding to step S1 in Embodiment 1 of the present invention;

[0020] Figure 6 , Figure 7 This is a structural diagram corresponding to step S2 in Embodiment 1 of the present invention;

[0021] Figure 8 , Figure 9 , Figure 10 This is a structural diagram corresponding to step S3 in Embodiment 1 of the present invention;

[0022] Figure 11 , Figure 12 , Figure 13 This is a structural diagram corresponding to step S4 in Embodiment 1 of the present invention;

[0023] Figure 14 This is a structural diagram corresponding to step S5 in Embodiment 1 of the present invention;

[0024] Figure 15 This is a structural diagram corresponding to step S6 in Embodiment 1 of the present invention;

[0025] Figure 16 This is a structural diagram corresponding to step S7 in Embodiment 1 of the present invention;

[0026] Figure 17 These are schematic diagrams of the compensation pads in Embodiments 1 and 2 of the present invention;

[0027] Figure 18 , Figure 19 This is a schematic diagram showing the interconnection between the four-channel waveguide rotary joint and the mechanism in Embodiment 2 of the present invention.

[0028] Figure 20 This is a structural diagram corresponding to step S1 in Embodiment 2 of the present invention;

[0029] Figure 21 This is a structural diagram corresponding to step S2 in Embodiment 2 of the present invention;

[0030] Figure 22 This is a structural diagram corresponding to step S3 in embodiment two of the present invention;

[0031] Figure 23 This is a structural diagram corresponding to step S4 in Embodiment 2 of the present invention;

[0032] Figure 24 This is a structural diagram corresponding to steps S5 and S6 in Embodiment 2 of the present invention;

[0033] Figure 25 This is a structural diagram corresponding to step S7 in Embodiment 2 of the present invention;

[0034] Figure 26 This is a schematic diagram showing the channel numbers of the four-channel waveguide rotary joint in Embodiment 2 of the present invention;

[0035] Figure 27 This is a comparison table of the experimental states of each channel in the four-channel waveguide rotary joint of Embodiment 2 of the present invention. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings:

[0037] like Figure 1 The assembly method shown here for a multi-channel waveguide rotary joint with multi-faceted mounting includes the following steps:

[0038] S1: Under the influence of gravity alone, the joint flange surface is fitted to the first bracket mounting surface, and a feeler gauge is used to confirm the gap between the joint flange surface and the first bracket mounting surface in this state.

[0039] S2: Based on the gap size confirmed in S1, place a compensation shim of the existing size between the corresponding joint flange surface and the first bracket mounting surface, and connect the joint flange surface and the first bracket mounting surface together with fasteners, leaving a gap of 1 to 2 mm between the two surfaces.

[0040] S3: Place the joint in an inverted position, so that it is subjected only to its own weight G and the tension F provided by the fastener in the vertical direction. Then, by repeatedly and evenly pre-tightening and tightening the fasteners connecting the joint and the first bracket, the installation of the flange surface of the joint and the first bracket is completed.

[0041] S4: Install the first bracket together with the joint at the corresponding working part of the mechanism or structure;

[0042] S5: Install the second bracket, which is interconnected with other flange surfaces of the joint, at the corresponding working part of the mechanism or structure. Do not lock all fasteners connecting the second bracket and the mechanism or structure to ensure that the second bracket has a certain amount of room to move in that position.

[0043] S6: Adjust the position of the second bracket, and at the same time use a feeler gauge to test so that the gap between the mounting surface of the second bracket and the corresponding joint flange surface is the same as the size of the existing compensation gasket, and tighten the fasteners connecting the second bracket to the mechanism or structure.

[0044] S7: Insert the existing size compensation shim between the joint flange face and the second bracket mounting face, and connect the two with fasteners;

[0045] S8: Repeat S5, S6 and S7 to install the other flange faces of the joint onto other brackets to be installed, completing the assembly of the multi-channel waveguide rotary joint with the mechanism or structure.

[0046] To better understand this assembly method, specific embodiments are described below.

[0047] Example 1: A four-channel waveguide rotary joint is mechanically interconnected with a certain experimental tooling.

[0048] like Figure 2 , Figure 3 The four-channel waveguide rotary joint shown is composed of five concentrically nested joints stacked together. The four-channel waveguide rotary joint has a total of five joint flange surfaces, namely joint flange surface 1, joint flange surface 2, joint flange surface 3, joint flange surface 4, and joint flange surface 5.

[0049] The test fixture includes a first support 6, a second support 7, and a base 8.

[0050] Figure 4 This is a schematic diagram of the four-channel waveguide rotary joint and the test fixture after mechanical interconnection. The joint flange surface 1, joint flange surface 2, and joint flange surface 3 need to be interconnected with the mounting surface of the first bracket 6, and the joint flange surface 4 and joint flange surface 5 need to be interconnected with the mounting surface of the second bracket 7. The first bracket 6 and the second bracket 7 are respectively interconnected with the base 8 by screws.

[0051] The specific assembly method is as follows:

[0052] S1: As Figure 5 As shown, under the action of gravity alone, the joint flange surface 1, joint flange surface 2, and joint flange surface 3 are fitted to the mounting surface of the first bracket 6, and the gap between the joint flange surface 1, joint flange surface 2, joint flange surface 3 and the mounting surface of the first bracket 6 in this state is confirmed by feeler gauge.

[0053] S2: As Figure 6 , Figure 7 As shown, according to the gap size confirmed in S1, a compensation shim 9 of the existing size is placed between the corresponding joint flange surface and the mounting surface of the first bracket 6, and the joint flange surface 1, joint flange surface 2, joint flange surface 3 are connected to the mounting surface of the first bracket 6 by fasteners, with a gap of 1 to 2 mm reserved on both sides.

[0054] S3: As Figure 8 , Figure 9 , Figure 10As shown, the joint is placed upside down, and in the vertical direction it is only subjected to its own weight G and the tension F provided by the fastener. Then, by repeatedly and evenly pre-tightening and fastening the fasteners connecting the joint flange surface 1, joint flange surface 2, joint flange surface 3 and the mounting surface of the first bracket 6, the installation of the joint flange surface 1, joint flange surface 2, joint flange surface 3 and the first bracket 6 is completed.

[0055] S4: As Figure 11 , Figure 12 , Figure 13 As shown, the first bracket 6, together with the joint, is installed on the corresponding working part of the base 8;

[0056] S5: As Figure 14 As shown, the second bracket 7, which is interconnected with the joint flange surface 4 and the joint flange surface 5, is installed at the corresponding working part of the base 8. All fasteners connecting the second bracket 7 and the base 8 are not locked to ensure that the second bracket 7 has a certain amount of room to move at this position.

[0057] S6: As Figure 15 As shown, adjust the position of the second bracket 7, and at the same time use a feeler gauge to test so that the gap between the mounting surface of the second bracket 7 and the joint flange surface 4 and the joint flange surface 5 is the same as the size of the existing compensation shim, and tighten the fasteners connecting the second bracket 7 and the base 8.

[0058] S7: As Figure 16 As shown, a compensation shim 9 of the existing size is inserted into the gap between the joint flange surface 4, the joint flange surface 5 and the corresponding mounting surface of the second bracket 7, and the two are connected by fasteners.

[0059] In this embodiment, as Figure 17 As shown, the thicknesses of the compensation shims 9 are 0.01mm, 0.02mm, 0.05mm, and 0.08mm. Other gap dimensions can be compensated by combining these shim sizes. The fasteners between the joint flange faces 1, 2, and 3 and the mounting surface of the first bracket 6 in step S3 are... Figure 10 Fasteners within the dashed box.

[0060] Example 2: A four-channel waveguide rotary joint interconnected with a certain mechanism.

[0061] like Figure 2 , Figure 3 The four-channel waveguide rotary joint shown is composed of five concentrically nested joints stacked together. The four-channel waveguide rotary joint has a total of five joint flange surfaces, namely joint flange surface 1, joint flange surface 2, joint flange surface 3, joint flange surface 4, and joint flange surface 5.

[0062] The mechanism includes a third support 10, a rotating hinge 11, a fourth support 12, and a fixed hinge 13.

[0063] Figure 18 , Figure 19 This is a schematic diagram of the interconnection between the four-channel waveguide rotary joint and the mechanism. Joint flange surface 1, joint flange surface 2, and joint flange surface 3 are interconnected with the mounting surface of the third bracket 10. Joint flange surface 4 and joint flange surface 5 are interconnected with the mounting surface of the fourth bracket 12. The third bracket 10 is interconnected with the rotating hinge 11 by screws, and the fourth bracket 12 is interconnected with the fixed hinge 13 by screws.

[0064] The specific assembly method is as follows:

[0065] S1: As Figure 20 As shown, under the action of gravity alone, the joint flange surface 1, joint flange surface 2, joint flange surface 3 are fitted with the mounting surface of the third bracket 10, and the gap between the joint flange surface 1, joint flange surface 2, joint flange surface 3 and the mounting surface of the third bracket 10 in this state is confirmed by feeler gauge.

[0066] S2: As Figure 21 As shown, according to the gap size confirmed in S1, a compensation shim 9 of the existing size is placed between the corresponding joint flange surface and the mounting surface of the third bracket 10, and the joint flange surface 1, joint flange surface 2, joint flange surface 3 are connected to the mounting surface of the third bracket 10 by fasteners, with a gap of 1 to 2 mm reserved on both sides.

[0067] S3: As Figure 22 As shown, the joint is placed upside down, and in the vertical direction it is only subjected to its own weight G and the tension F provided by the fastener. Then, by repeatedly and evenly pre-tightening and fastening the fasteners connecting the joint flange surface 1, joint flange surface 2, joint flange surface 3 and the mounting surface of the third bracket 10, the installation of the joint flange surface 1, joint flange surface 2, joint flange surface 3 and the third bracket 10 is completed.

[0068] S4: As Figure 23 As shown, the third bracket 10, together with the joint, is installed on the corresponding working part of the rotating hinge 11;

[0069] S5: As Figure 24 As shown, the fourth bracket 12, which is interconnected with the joint flange surface 4 and the joint flange surface 5, is installed at the corresponding working part of the fixed hinge 13. All fasteners connecting the fourth bracket 12 and the fixed hinge 13 are not locked to ensure that the fourth bracket 12 has a certain amount of movement space at this position.

[0070] S6: As Figure 24 As shown, adjust the position of the fourth bracket 12, and at the same time use a feeler gauge to test so that the gap between the mounting surface of the fourth bracket 12 and the joint flange surface 4 and the joint flange surface 5 is the same as the size of the existing compensation shim 9, and tighten the fasteners connecting the fourth bracket 12 and the fixed hinge 13.

[0071] S7: As Figure 25 As shown, a compensation shim 9 of the existing size is inserted into the gap between the joint flange face 4, the joint flange face 5 and the corresponding mounting surface of the fourth bracket 12, and the two are connected by fasteners.

[0072] Furthermore, in order to verify the effectiveness of the method provided by the present invention, the degree of isolation between the channels of the rotary joint in three states were tested: a free state without interconnection with a certain mechanism (referred to as state 1), a state after assembly with a certain mechanism without mechanical and rotational tests (referred to as state 2), and a state after assembly with a certain mechanism and mechanical and rotational tests (referred to as state 3).

[0073] Figure 26 , Figure 27 This is a schematic diagram of the channel numbers of a four-channel waveguide rotary joint in Embodiment 2 of the present invention, along with the test results of the isolation between channels.

[0074] Observations revealed that the isolation test results between channels remained stable under several different conditions, demonstrating that the assembly method provided by this invention results in minimal residual assembly stress after assembling multi-mounting-surface, multi-channel waveguide rotary joints with structures or mechanisms, insufficient to affect joint performance. This method solves the problem of the impact of assembly stress on the isolation between multiple channels of a multi-channel waveguide rotary joint after assembly with other components, and also has advantages such as simplicity, efficiency, operability, and strong reference value.

[0075] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An assembly method for a multi-channel waveguide rotary joint with multi-faceted mounting, characterized in that: Includes the following steps, S1: Under the influence of gravity alone, the joint flange surface is fitted to the first bracket mounting surface, and a feeler gauge is used to confirm the gap between the joint flange surface and the first bracket mounting surface in this state. S2: Based on the gap size confirmed in S1, place a compensation shim of the existing size between the corresponding joint flange surface and the first bracket mounting surface, and connect the joint flange surface and the first bracket mounting surface together with fasteners, leaving a gap of 1 to 2 mm between the two surfaces. S3: Place the joint in an inverted position, so that it is subjected only to its own weight G and the tension F provided by the fastener in the vertical direction. Then, by repeatedly and evenly pre-tightening and tightening the fasteners connecting the joint and the first bracket, the installation of the flange surface of the joint and the first bracket is completed. S4: Install the first bracket together with the joint at the corresponding working part of the mechanism or structure; S5: Install the second bracket, which is interconnected with other flange surfaces of the joint, at the corresponding working part of the mechanism or structure. Do not lock all fasteners connecting the second bracket and the mechanism or structure to ensure that the second bracket has a certain amount of room to move in that position. S6: Adjust the position of the second bracket, and at the same time use a feeler gauge to test so that the gap between the mounting surface of the second bracket and the corresponding joint flange surface is the same as the size of the existing compensation gasket, and tighten the fasteners connecting the second bracket to the mechanism or structure. S7: Insert the existing size compensation shim between the joint flange face and the second bracket mounting face, and connect the two with fasteners; S8: Repeat S5, S6 and S7 to install the other flange faces of the joint onto other brackets to be installed, completing the assembly of the multi-channel waveguide rotary joint with the mechanism or structure.

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