Concentric positioning fixture for assembling a circulator

Abstract

The application relates to a concentric positioning clamp for assembling a ring shaper, which comprises a base, a cavity positioning groove in the middle of the base and a plurality of sliding block grooves radiating outwardly from the base, a movable positioning sliding block assembly arranged in each sliding block groove, a protruding driving pin on the top surface of the positioning sliding block assembly and a working end extending to the center of the base, a plurality of driving grooves in the bottom of an upper cover, the grooves being evenly arranged around the center of the upper cover, and the driving grooves being variable-distance waist-shaped grooves. When the clamp works, the upper cover is connected with the base through a stud but is not fixed, the upper cover is turned to the top, a semi-finished ring shaper is put into the cavity positioning groove, the upper cover is turned again, the driving grooves of the upper cover drive the driving pins and then drive the positioning sliding block assemblies to move to the center of the base synchronously, and the working ends of the positioning sliding block assemblies simultaneously push the center conductor and the ferrite substrate from multiple directions, so that the center conductor and the ferrite substrate are in a concentric position. The clamp has the advantages of high concentric positioning precision, good assembly consistency, simple structure, simple operation and wide application.

Description

Technical Field

[0001] This invention relates to the field of circulator technology, and more particularly to a concentric positioning fixture for assembling circulators. Background Technology

[0002] A circulator is an important microwave ferrite device that is widely used in wireless transceiver systems.

[0003] Circulators typically consist of multiple layers of materials (substrates) stacked inside a cavity, with a final (topmost) cover plate connecting to the cavity to enclose all the materials. These stacked materials include a central conductor, ferrite substrates located above and below the central conductor, and other layered components. There are assembly gaps between the central conductor, ferrite substrates, and other materials and the inner wall of the cavity. Without effective alignment during assembly, misalignment and other issues can easily occur. To ensure better circulator performance, the ferrite substrates and the central conductor must have a good match, requiring a high degree of concentricity during assembly.

[0004] Existing technologies also include some fixtures to ensure the concentricity of circulator assembly. For example, Chinese Patent CN 213304319U discloses an assembly device for a circulator, which includes at least three centering mechanisms arranged around the circulator to be assembled. Taking three centering mechanisms as an example, the three centering mechanisms are arranged at a 90° angle, and the pushing mechanism of each centering mechanism pushes a push rod to contact the middle circulator, thus playing a positioning role. In this scheme, the push rods of the centering mechanisms are controlled by three pushing mechanisms, and synchronization cannot be guaranteed; moreover, the operation is complicated, and the push rods are arranged at a 90° angle, not directly facing the center of the circulator, resulting in low concentricity accuracy of the circulator assembly.

[0005] There are also positioning mechanisms installed in automatic assembly machines. For example, CN 210232813 U discloses a centering fixture for an automatic assembly machine of isolators. The isolator cavity is placed in the center of the fixture body. The cavity has three holes, and the relative positions of the holes are set by three horizontal push rods. When placing the ferrite substrate, the cylinder pushes three synchronous connecting rings, which drive three vertical push rods to rise. The vertical push rods and the horizontal push rods are obliquely connected, and the three vertical push rods push the horizontal push rods outward. Afterward, the vertical push rods descend, the horizontal push rods return to their original position, and the heads of the horizontal push rods press against the ferrite substrate, adjusting it to a concentric position with the cavity. In the above patent, the three synchronous connecting rings drive the three horizontal push rods, which is still separately controlled. The synchronization of the actions cannot be guaranteed, and the circulator cannot achieve high centering accuracy. Moreover, the mechanism is also very complex. It also requires three more holes to be set on the circulator wall, increasing the process steps.

[0006] Based on the two examples above and other circulator assembly fixture solutions, the disadvantages of existing assembly fixtures are as follows: First, the centering push rods (devices) for positioning the circulator's central conductor or substrate are controlled separately by their respective power mechanisms, resulting in poor synchronicity. These push rods generally have return springs and are elastic; poor synchronicity leads to misalignment of the circulator's central conductor or ferrite substrate relative to the cavity, resulting in poor concentricity. This leads to low assembly accuracy and poor product consistency, severely affecting the circulator's electrical performance. The primary purpose of assembly fixtures is to improve the concentricity accuracy of circulator assembly, and clearly, some existing fixtures cannot meet the high-precision requirements. Second, many circulator assembly fixtures have very complex structures, are complex to operate, and are costly. Summary of the Invention

[0007] In view of the shortcomings or deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a concentric positioning fixture for assembling circulators, which enables the circulator assembly to achieve high concentricity accuracy, good product performance consistency, and has a simple structure, low cost, and is suitable for manual operation or application in automated machinery.

[0008] To solve the above-mentioned technical problems, the present invention has the following structure: A concentric positioning fixture for assembling a circulator includes a base, multiple movable positioning slider assemblies disposed on the base, and a top cover connected to the base via multiple threaded cylindrical pins and nuts. The base is a disc-shaped part with its bottom surface placed on a platform. A cavity positioning groove is opened at the center of the top surface to accommodate and position the cavity of the circulator. At least three long grooves radiate outward from the cavity positioning groove as slider grooves, and the multiple slider grooves equally divide the circumference. The slider grooves communicate with the cavity positioning grooves, and movable positioning slider assemblies are disposed within the slider grooves. The positioning slider assembly includes a slider, a positioning claw, and a ball screw. The slider has a cuboid structure, and its bottom surface contacts the bottom surface of the slider groove. The top surface has a raised drive pin and a positioning claw groove opening downwards from the top surface. A threaded through hole is opened on the section of the slider away from the center of the base, and a ball screw is installed in the threaded through hole. The positioning part of the positioning claw is embedded in the positioning claw groove of the slider for positioning. A working end extends from the positioning part towards the center of the base. A slender groove is opened from the end of the working end towards the positioning part as a pin groove to accommodate the central conductor pin of the circulator. The end face of the working end is a mating arc surface that matches the outer edge surface of the ferrite substrate of the circulator. The head of the ball screw rests on the back of the positioning claw and is screwed in place. Adjust the position of the positioning claw within the slider by tightening the adjusting ball screw, so that the working end of each positioning slider assembly is equidistant from the center of the base; multiple oblong through holes through which threaded cylindrical pins pass are provided on the top cover; at least three drive slots of the same size are opened from the bottom of the top cover, the slots are evenly arranged around the center of the top cover, and the corresponding position of each drive slot is equidistant from the center of the top cover. The drive slots are oblong slots with variable distances, and the distance from each point on a single drive slot to the center of the top cover changes continuously from far to near; an operating hole is opened at the center of the top cover, and the diameter of the operating hole is larger than the outer diameter of the center conductor of the circulator; When assembling the fixture, place the positioning slider assemblies one by one into the slider slots of the base, fit the waist-shaped through hole of the top cover into the threaded cylindrical pin installed on the base, and simultaneously embed the drive pins of each positioning slider assembly into the drive slots of the top cover. Then screw on the nut on the top cover. At this time, it is not necessary to tighten it completely so that the top cover can rotate freely. When the fixture is in operation, rotate the top cover to the top and place the circulator semi-finished product into the cavity positioning groove of the base through the operation hole of the top cover. The pins of the center conductor are respectively embedded in the pin grooves of the positioning claw. Then rotate the top cover, and the drive pin of the drive groove drives the slider, thereby driving at least three positioning slider assemblies to move synchronously towards the center of the base. The working end of the positioning claw pushes the center conductor and the ferrite substrate from multiple directions at the same time, so that the center conductor and the ferrite substrate are in a concentric position. Then tighten the nut to fix the top cover, and continue to load the remaining materials of the circulator to complete the circulator assembly.

[0009] The centerline of the variable-distance waist-shaped groove of the preferred drive groove is an arc or a polyline.

[0010] Preferably, when viewed from the top of the cover, the distance from each point in the drive groove to the center of the cover increases from farthest to closest in a clockwise direction, and the center line of the drive groove is an arc.

[0011] Preferably, the number of positioning slider assemblies is equal to the number of slider slots in the base and the number of drive slots in the top cover, and their positions correspond. Preferably, there are three of them, and they are evenly arranged at equal intervals around the center of the positioning fixture.

[0012] Preferably, a T-shaped positioning claw groove is opened on the top surface of the slider. The horizontal groove of the T-shaped groove is perpendicular to the vertical groove. The horizontal groove of the T-shape is parallel to the cross-section of the slider near the center of the base. The horizontal groove is open on both sides and the vertical groove is open at one end. The T-shaped positioning part of the positioning claw is embedded in the positioning claw groove.

[0013] Preferably, the threaded holes of the multiple mounting threaded cylindrical pins on the base are evenly distributed on a circumference with the center of the base as the center. Correspondingly, the oblong through holes of the top cover are also evenly distributed on a circumference with the center of the top cover as the center. The diameters of the two circumferences are equal to ensure that the centers of the connected base and top cover coincide.

[0014] Preferably, the upper edges of the cavity positioning groove of the base and the operating hole of the top cover are provided with a large chamfer to facilitate the smooth insertion of the various parts of the circulator.

[0015] Preferably, the nut for tightening the top cover is a cap-type nut.

[0016] Furthermore, multiple handles are evenly fixed on the outer circumference of the top cover, making it convenient to manually rotate the top cover.

[0017] Compared with the prior art, the advantages of the present invention are as follows: The movement of at least three positioning slider assemblies in this invention is uniformly driven by the top cover, ensuring synchronous movement of the positioning slider assemblies. Combined with the fine-tuning function of the ball screws, this ensures that the working end of each positioning slider assembly is equidistant from the center of the base, resulting in higher positioning accuracy for the circulator. Furthermore, the positioning claw simultaneously has a pin slot (for mating with the center conductor) and a mating arc surface (for mating with the ferrite substrate), further improving the concentricity of the center conductor and the ferrite substrate. Therefore, the concentricity of the center conductor and the ferrite substrate of the circulator manufactured using the concentric positioning fixture of this invention can reach ≤0.05mm, resulting in better assembly consistency for the circulator product.

[0018] This invention has fewer parts and a simpler structure in its overall design; moreover, the use of ball screws for fine-tuning the positioning claw is very simple and feasible. In terms of operation, the centering action can be completed by simply rotating the top cover slightly in both directions and fixing it with a cap-shaped nut. The operation is very simple and suitable for use in automated equipment.

[0019] Therefore, the concentric positioning fixture for assembling the circulator of the present invention has the advantages of high concentric positioning accuracy, good assembly consistency of the circulator, simple structure, simple operation, and wide application. Attached Figure Description

[0020] Figure 1 : Exploded view of the concentric positioning fixture for assembling the circulator of the present invention; Figure 2 : A top view of the concentric positioning fixture for assembling the circulator of the present invention; Figure 3 Exploded view of the circulator to be assembled; Figure 4 Assembly diagram of the positioning slider assembly of the present invention; Figure 5 : A bottom perspective view of the top cover of the present invention. Detailed Implementation

[0021] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention.

[0022] An exploded view of the concentric positioning fixture for assembling the circulator of this invention is shown below. Figure 1 The top view after assembly is shown below. Figure 2 .

[0023] Figure 1 As shown, the concentric positioning fixture for assembling the circulator includes a base 1, on which multiple sets of movable positioning slider assemblies 2 are mounted. The upper cover 4 is connected to the base 1 via multiple threaded cylindrical pins 3 and nuts 6. After the entire fixture is assembled, the circulator semi-finished product 8 is placed in the cavity positioning groove 11 in the middle of the base 1. The upper cover 4 is rotated, and at least three positioning slider assemblies 2 simultaneously perform concentric positioning of the circulator ferrite substrate 82 and the central conductor 83 from their respective directions. The position of the upper cover 4 is then locked, and other parts of the circulator are then installed and subsequent assembly is performed.

[0024] Circulator semi-finished product 8 Figure 3 The ring chamber 81, ferrite substrate 82, and center conductor 83 shown are initially assembled in sequence.

[0025] by Figure 1 and Figure 3 To further illustrate, the base 1 of this invention is a disc-shaped part. The bottom surface of the base 1 is placed on a platform, and a cavity positioning groove 11 is opened at the center of the top surface to accommodate the circulator semi-finished product 8. The shape of the cavity positioning groove 11 is determined according to the shape of the circulator cavity 81, so that the circulator cavity 81 cannot move after being placed in. For example... Figure 1 The cavity positioning groove 11 is suitable for Figure 3The cavity 81. Three long grooves radiate outward from the cavity positioning groove 11 on the base 1 as slider grooves 12. The three slider grooves 12 equally divide the circumference, that is, the included angle between adjacent grooves is 120°. The slider grooves 12 are connected to the cavity positioning groove 11.

[0026] Figure 1 In the middle, the upper edge of the cavity positioning groove 11 is provided with a large chamfer to facilitate the smooth placement of each part of the circulator.

[0027] The base 1 is provided with multiple threaded holes for fixing threaded cylindrical pins 3, preferably the multiple threaded holes are evenly distributed on the same circumference with the center of the base 1 as the center. Figure 1 The embodiment includes three threaded cylindrical pins 3 and three threaded holes.

[0028] A positioning slider assembly 2 is installed in each of the three slider slots 12 of the base 1.

[0029] like Figure 4 As shown, the positioning slider assembly 2 includes a slider 21, a positioning claw 22, and a ball screw 23.

[0030] Combination Figure 1 and Figure 4 As can be seen, the slider 21 has a cuboid structure, with its bottom surface contacting the bottom of the slider groove 12. A raised cylindrical drive pin 211 is located on the top surface of the cuboid. The slider 21 also has a T-shaped deep groove opening downwards from the top surface, serving as a positioning claw groove 212. The horizontal groove of the T-groove is perpendicular to the vertical groove, and the horizontal groove is parallel to the cross-section of the slider 21 near the center of the base 1. The vertical groove is open on both sides, with the vertical groove opening towards the center of the base 1. A threaded through hole is drilled on the cross-section of the slider 21 away from the center of the base 1, and a ball screw 23 is installed in the through hole.

[0031] The structure of positioning claw 22 is still referenced. Figure 1 and Figure 4 The T-shaped positioning part of the positioning claw 22 is embedded in the positioning claw groove 212 of the slider 21 to limit the position of the positioning claw 22. The working end extends from the positioning part to the center of the base 1 and is long and narrow. A long and narrow groove is opened from the end of the working end toward the positioning part as a pin groove 221 to accommodate the pin of the circulator center conductor 83. The end face of the working end is a mating arc surface 222, which matches the outer edge surface of the ferrite substrate 82 of the circulator.

[0032] The T-shaped positioning claw groove 212 on the slider 21 and the T-shaped positioning part of the positioning claw 22 can also be changed to other shapes, any shape that aims to position the positioning claw 22.

[0033] The shape of the pin slot 221 and mating arc surface 222 of the positioning claw 22 matches the center conductor 83 and ferrite substrate 82 of the circulator. If the structural dimensions of the circulator product to be assembled change, the matching positioning claw 22 can be replaced.

[0034] Figure 1 and Figure 4 As can be seen, in the assembly of the positioning slider assembly 2, the ball head of the ball screw 23 rests against the back of the positioning claw 22 (not shown). By adjusting the displacement of the ball screw 23 as it is screwed into its mounting hole, the position of the positioning claw 22 within the slider 21 can be finely adjusted. This ensures that after the positioning fixture of the present invention is assembled, the working ends of the three positioning claws 22 are equidistant from the center of the base 1. The consistency of this distance determines the accuracy of the positioning fixture of the present invention, thereby determining the concentricity of the central conductor 83 of the circulator and the ferrite substrate 82. The positioning slider assembly 2 uses the ball screw 23 as a fine-tuning structure, which simply and accurately achieves the purpose of fine-tuning the position of the working ends of the positioning claws 22.

[0035] The top cover 4 is mounted above the base 1. Three identical drive slots 42 are formed on the side of the top cover 4 facing the base 1 (bottom). These slots are evenly distributed around the center of the top cover 4, and the corresponding positions of each drive slot 42 are equidistant from the center of the top cover 4. Each drive slot 42 has a certain depth, is not a through hole, and is a variable-distance waist-shaped slot. The distance from each point on a single drive slot 42 to the center of the top cover 4 continuously changes from far to near. The centerline of the drive slot 42 is an arc or a polyline.

[0036] Figure 1 , Figure 2 , Figure 5 As can be seen from the top of the top cover 4 in this embodiment, when viewed through the top of the top cover 4, the distances from each point in the top cover 4 to the center of the top cover 4 increase in a clockwise direction. The upper cover 4 is provided with multiple waist-shaped through holes 41 through which threaded cylindrical pins 3 pass. Preferably, the multiple waist-shaped through holes 41 are evenly distributed on the same circumference with the center of the upper cover 4 as the center. Figure 1 The embodiment is provided with three waist-shaped through holes 41.

[0037] The circumference of the center of the waist-shaped through hole 41 of the upper cover 4 is equal to the circumference of the threaded hole of the threaded cylindrical pin 3 on the base 1. Each waist-shaped through hole 41 corresponds to the position of each threaded hole to ensure the concentricity of the upper cover 4 and the base 1.

[0038] An operating hole 43 is opened at the center of the upper cover 4 to accommodate the circulator semi-finished product 8. The diameter of the operating hole 43 must be larger than the outer diameter of the pin of the center conductor 83. The upper edge of the operating hole 43 of the upper cover 4 is provided with a large chamfer to facilitate the smooth insertion of the various parts of the circulator.

[0039] When assembling the concentric positioning fixture of the circulator of the present invention, first assemble the positioning slider assembly 2, place the positioning claw 22 into the slider 21, screw the ball screw 23 into the threaded hole, adjust the screwing position of the ball screw 23 of each concentric positioning fixture so that the distance from the end of each positioning claw 22 to the drive pin 211 of the slider 21 is equal; after assembling the positioning slider assembly 2, place it one by one into each slider groove 12 of the base 1; screw one end of each threaded cylindrical pin 3 into the threaded hole of the base 1, and let the waist-shaped through hole 41 of the upper cover 4 pass through the other end of the threaded cylindrical pin 3, so that the drive pin 211 of each positioning slider assembly 2 is embedded in each drive groove 42 of the upper cover 4, and then tighten the nut 6 on the upper cover 4, but at this time the nut 6 cannot be completely tightened, leaving 2 to 3 threads so that the upper cover 4 can rotate freely.

[0040] After the positioning fixture is assembled, rotate the top cover 4 counterclockwise to the top, and place the circulator semi-finished product 8 into the cavity positioning groove 11 of the base 1 through the operation hole 43 of the top cover 4. The pins of the center conductor 83 are respectively located in the pin groove 221 of the positioning claw 22. Then, rotate the top cover 4 clockwise. The drive groove 42 in the form of a variable distance waist-shaped groove of the top cover 4 pushes each slider 21 to move synchronously towards the center of the base 1, thereby driving the three positioning slider assemblies 2 to move synchronously towards the center of the base 1. The working end of the positioning claw 22 pushes the center conductor 83 and the ferrite substrate 82 from three directions at the same time, so that the center conductor 83 and the ferrite substrate 82 are in a concentric position. Tighten any one of the nuts 6 on the top cover 4 to fix the top cover 4 and fix the center conductor 83 and the ferrite substrate 82 in a concentric position. Continue to load the remaining materials from the top to complete the circulator assembly.

[0041] From the assembly and working process of the positioning fixture above, the position of the drive groove 42 of the upper cover 4 (distance from the center of the upper cover 4) and the length of the slider groove 12 of the base 1 must match each other to ensure that the drive pin 211 of the positioning slider assembly 2 in the slider groove 12 can be embedded in the drive groove 42 of the upper cover 4, and the positioning slider assembly 2 can move a certain distance.

[0042] The relationship between the rotation direction of the upper cover 4 and the movement direction of the positioning slider assembly 2 depends on the shape and orientation of the variable distance drive groove 42. If the shape of the drive groove 42 is reversed compared to the above embodiment, it is also feasible. That is, when viewed from the top of the upper cover 4, the drive groove 42 moves from far to near the center of the upper cover 4 in a counterclockwise direction. In this way, when operating the clamp, the upper cover 4 is first placed on top, then the upper cover 4 is rotated counterclockwise to center the ring, and then the cap nut is tightened to fix the upper cover 4.

[0043] If the positioning clamp of the present invention is used manually, multiple handles can be evenly arranged and fixed on the outer circumferential surface of the upper cover 4. Figure 1 or Figure 2 (As shown), it is convenient to rotate the top cover 4 repeatedly.

[0044] Nut 6 is preferably a cap-type nut.

[0045] The positioning fixture of the present invention can also be used in an automatic assembly machine, in which case a mechanism for automatically rotating the top cover 4 is set according to the actual situation of the automatic assembly machine.

[0046] The above embodiment is illustrated using three sets of positioning slider assemblies 2 as an example. It is easy to see from the above description that the number of positioning slider assemblies 2 is equal to the number of slider grooves 12 in the base 1 and the number of drive grooves 42 in the upper cover 4, their positions are corresponding, and they are evenly arranged at equal intervals around the center of the positioning fixture, with a minimum number of three. Because three sets of positioning slider assemblies 2 achieve the centering effect and have the lowest cost, three sets are the preferred solution.

[0047] In summary, the movement of at least three positioning slider assemblies in this invention is uniformly driven by the top cover, rather than driven separately, thus ensuring synchronous movement of the positioning slider assemblies. Furthermore, the fine-tuning function of the ball screws ensures that the working ends of each positioning slider assembly are equidistant from the center of the base, resulting in higher positioning accuracy for the circulator. Moreover, the positioning claw of this invention simultaneously has a pin slot (for mating with the center conductor) and a mating arc surface (for mating with the ferrite substrate), further improving the concentricity of the center conductor and the ferrite substrate. Therefore, the concentricity of the center conductor and the ferrite substrate of the circulator manufactured using the concentric positioning fixture of this invention can reach ≤0.05mm, resulting in better assembly consistency for the circulator product.

[0048] This invention has fewer parts and a simpler structure in its overall design; moreover, the use of ball screws for fine-tuning the positioning claw is very simple and feasible. In terms of operation, the centering action can be completed by simply rotating the top cover slightly in both directions and fixing it with a cap-shaped nut. The operation is very simple and suitable for use in automated equipment.

[0049] Therefore, the concentric positioning fixture for assembling the circulator of the present invention has the advantages of high concentric positioning accuracy, good assembly consistency of the circulator, simple structure, simple operation, and wide application.

[0050] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A concentric positioning fixture for assembling a ring assembly, characterized in that, Includes a base (1), multiple movable positioning slider assemblies (2) disposed on the base (1), and a top cover (4) connected to the base (1) by multiple threaded cylindrical pins (3) and nuts (6); The base (1) is a disc-shaped part with its bottom surface placed on a platform. A cavity positioning groove (11) is opened at the center of the top surface to accommodate and position the cavity (81) of the circulator. At least three long grooves are radiating outward from the cavity positioning groove (11) as slider grooves (12). The multiple slider grooves (12) equally divide the circumference. The slider grooves (12) are connected to the cavity positioning groove (11). The movable positioning slider assembly (2) is provided in the slider groove (12). The positioning slider assembly (2) includes a slider (21), a positioning claw (22) and a ball screw (23). The slider (21) has a cuboid structure and its bottom surface is in contact with the bottom surface of the slider groove (12). The top surface has a raised drive pin (211) and a positioning claw groove (212) opening downward from the top surface. The slider (21) has a threaded through hole on the cross section away from the center of the base (1), and the ball screw (23) is installed in the threaded through hole. The positioning part of the positioning claw (22) is embedded in the positioning claw groove (212) of the slider (21) for positioning. The working end extends from the positioning part to the center of the base (1). A long and thin groove is opened from the end of the working end to the positioning part as a pin groove (221) to accommodate the pin of the circulator center conductor (83). The end face of the working end is a mating arc surface (222) that matches the outer edge surface of the ferrite substrate (82) of the circulator. The head of the ball screw (23) is against the back of the positioning claw (22). By turning and adjusting the ball screw (23), the position of the positioning claw (22) in the slider (21) is finely adjusted, so that the working end of each positioning slider assembly (2) is equal to the center of the base (1). The upper cover (4) is provided with a plurality of waist-shaped through holes (41) through which the threaded cylindrical pins (3) pass; at least three drive grooves (42) of the same size are opened from the bottom of the upper cover (4), the grooves are evenly arranged around the center of the upper cover (4), the corresponding position of each drive groove (42) is equidistant from the center of the upper cover (4), the drive groove (42) is a variable distance waist-shaped groove, and the distance from each point on a single drive groove (42) to the center of the upper cover (4) changes continuously from far to near; an operation hole (43) is opened at the center of the upper cover (4), the diameter of the operation hole (43) is larger than the outer diameter of the central conductor (83) of the circulator; When assembling the fixture, the positioning slider assembly (2) is placed one by one into each of the slider slots (12) of the base (1), and the waist-shaped through hole (41) of the upper cover (4) is fitted into the threaded cylindrical pin (3) installed on the base (1). The driving pin (211) of each positioning slider assembly (2) is simultaneously embedded into the driving slot (42) of the upper cover (4). Then, the nut (6) above the upper cover (4) is screwed on. At this time, it is not necessary to tighten it completely so that the upper cover (4) can rotate freely. When the fixture is working, the top cover (4) is rotated to the top, and the circulator semi-finished product (8) is placed in the cavity positioning groove (11) of the base (1) from the operation hole (43) of the top cover (4). The pins of the center conductor (83) are respectively embedded in the pin groove (221) of the positioning claw (22). Then the top cover (4) is rotated, and the driving groove (42) drives the driving pin (211) of the slider (21) to drive at least three positioning slider assemblies (2) to move synchronously towards the center of the base (1). The working end of the positioning claw (22) pushes the center conductor (83) and the ferrite substrate (82) from multiple directions at the same time, so that the center conductor (83) and the ferrite substrate (82) are in a concentric position. Then the nut (6) is tightened to fix the top cover (4), and the remaining materials of the circulator are loaded to complete the circulator assembly.

2. The concentric positioning fixture for assembling the circulator according to claim 1, characterized in that, The centerline of the variable-distance waist-shaped groove of the drive groove (42) is an arc or a polyline.

3. The concentric positioning fixture for assembling the circulator according to claim 1, characterized in that, Looking at the drive groove (42) from the top of the cover (4), along the clockwise direction, the distance from each point in the drive groove (42) to the center of the cover (4) increases from far to near, and the center line of the drive groove (42) is an arc.

4. The concentric positioning fixture for assembling the circulator according to claim 1, characterized in that, The number of the positioning slider assembly (2) is three, the number of the slider groove (12) of the base (1) is three, and the number of the drive groove (42) of the upper cover (4) is three. They are positioned correspondingly and are evenly arranged at equal intervals around the center of the positioning fixture.

5. The concentric positioning fixture for assembling the circulator according to claim 1, characterized in that, The top surface of the slider (21) has a T-shaped positioning claw groove (212). The horizontal groove of the T-shaped groove is perpendicular to the vertical groove. The horizontal groove of the T-shaped groove is parallel to the cross section of the slider (21) near the center of the base (1). The horizontal groove is open on both sides and the vertical groove is open at one end. The T-shaped positioning part of the positioning claw (22) is embedded in the positioning claw groove (212).

6. The concentric positioning fixture for assembling the circulator according to claim 1, characterized in that, The multiple threaded holes on the base (1) for installing the threaded cylindrical pins (3) are evenly distributed on a circumference with the center of the base (1) as the center. Correspondingly, each of the waist-shaped through holes (41) on the upper cover (4) is also evenly distributed on a circumference with the center of the upper cover (4) as the center. The diameters of the two circumferences are equal to ensure that the centers of the connected base (1) and the upper cover (4) coincide.

7. The concentric positioning fixture for assembling the circulator according to claim 1, characterized in that, The upper edges of the cavity positioning groove (11) of the base (1) and the operation hole (43) of the upper cover (4) are chamfered to facilitate the smooth placement of each part of the circulator.

8. The concentric positioning fixture for assembling the circulator according to claim 1, characterized in that, The nut (6) that tightens the upper cover (4) is a cap-type nut.

9. The concentric positioning fixture for assembling an annulus according to claim 1, characterized in that, Multiple handles are evenly fixed on the outer circumference of the upper cover (4) to facilitate manual rotation of the upper cover (4).

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