A test fixture for high power cavity filters

Abstract

The utility model relates to a kind of test fixture of high-power cavity filter, including support base, support frame capable of being constructed multiple mutually different surfaces installation plate surface is provided on the support base, and double-row conveyor belt capable of driving the directional translation of filter to be measured is passed in the transverse passage defined in the support frame, wherein, composite limiting and clamping component capable of spacing arrangement is provided on the double-row conveyor belt and can be limited to filter to be measured, elastic pressing component capable of being positioned by the way of auxiliary definition test station of filter to be measured is provided on the suspended installation top plate of the support frame, and adjustable test mechanism is provided on the alignment installation side plate of the support frame and is divided at the two sides of the double-row conveyor belt. The utility model can ensure the stability of filter test station by the way of adaptability central clamping and multidirectional limiting, to ensure docking accuracy and improve test precision.

Description

Technical Field

[0001] This utility model relates to the field of filter test fixture technology, and in particular to a test fixture for a high-power cavity filter. Background Technology

[0002] A filter is a frequency selective device that allows signal components in a specified frequency band to transmit while significantly suppressing energy in other frequency bands. Based on this selective signal transmission mechanism, filters can be used to eliminate background interference or achieve frequency domain resolution. Cavity filters are formed using a monolithic metal cutting process, possessing an integral rigid structure. Their filtering performance is significantly constrained by key indicators such as the cavity quality factor (Q value) and coupling parameters. High-power cavity filters can effectively filter out specific frequencies or frequencies outside of those frequencies in a communication system, obtaining a signal of that specific frequency, or eliminating a signal of a specific frequency. They have advantages such as good out-of-band suppression, low insertion loss, and compact structure, effectively meeting the requirements of 5G communication systems for high bandwidth, low latency, and high data transmission rates. Currently, during filter production, filters are typically tested before leaving the factory to ensure product quality. During cavity filter testing, to ensure the effectiveness of the connection and the stability of the test, corresponding tooling fixtures are required. These fixtures prevent the cavity filter from shifting, enabling the cavity filter to complete the connection and testing work quickly and accurately.

[0003] For example, existing patent documents with application numbers CN202323498369.3 and CN201921926989.3 both involve a filter testing device. Both devices use a single-set alignment clamping structure to limit the filter's position, and then use a single test head with an adjustable workstation suspended above the alignment clamping structure to perform filter testing. However, in actual production, high-power cavity filters typically require multiple tests, including single-port and double-port docking tests. Furthermore, the test interfaces are usually located on the sides of the filter rather than its top surface. Therefore, the existing test head layout of filter testing devices is not suitable for testing high-power cavity filters. Furthermore, when clamping and positioning filters, the aforementioned filter testing equipment, in order to avoid the drawbacks of traditional cavity filter fixtures that easily damage the surface of the cavity filter due to excessive clamping force when using clamping plates, employs an alignment arrangement and equivalent elastic clamping fixation method to limit the placement position of the filter. However, this method can only clamp and fix both sides of the cavity filter simultaneously, and clamping from both sides can easily cause the cavity filter to wobble and become unstable during testing. Especially when using elastically buffered clamping on both sides to connect the test connector and the filter interface, although the elastic buffer structure avoids the impact damage caused by rigid clamping to some extent, when performing single-sided or two-sided connection with different forces, the insertion operation can cause the elastically limited filter to shift to a certain extent under the push, which cannot guarantee the effectiveness of the insertion connection. It is very easy for the filter to slip, leading to problems such as incomplete insertion and loose connection, introducing contact resistance and signal reflection, affecting test accuracy, especially at high power, and easily causing intermodulation distortion. Utility Model Content

[0004] The purpose of this invention is to provide a test fixture for high-power cavity filters that can ensure the stability of the filter test station through adaptive centering clamping and multi-directional limiting, thereby ensuring docking accuracy and improving test precision. Furthermore, it can achieve efficient continuous testing by separating the disassembly and assembly station from the test station, thus improving test efficiency. This invention addresses the problems of existing test equipment's elastic alignment clamping structure, which, although it can protect the filter, lacks sufficient clamping stability and cannot guarantee the effectiveness of docking, leading to easily distorted test results and affecting test accuracy. It also addresses the issues of existing test operations and disassembly / clamping being performed in the same station, resulting in long total time consumption and low overall test efficiency for batch testing.

[0005] The technical solution adopted by this utility model is as follows: a test fixture for a high-power cavity filter, including a support base, a support frame that can construct multiple mutually non-uniform mounting plates on the support base, and a double-row conveyor belt that can drive the filter under test to perform directional translation in the transverse channel defined by the support frame. The double-row conveyor belt is provided with a composite limiting clamping component that can limit the position of the filter under test and is arranged at intervals. The suspended mounting top plate of the support frame is provided with an elastic pressure component that can assist in limiting the test position of the filter under test by pressing down and positioning. The alignment mounting side plates of the support frame on both sides of the double-row conveyor belt are provided with an adjustable position test mechanism.

[0006] According to a preferred embodiment, the composite limiting clamping assembly includes a mounting platform, a centering elastic limiting mechanism, and a bottom adsorption limiting mechanism, wherein a plurality of the mounting platforms are arranged at intervals on the double-row conveyor belt; a plurality of the centering elastic limiting mechanisms are arranged at intervals in a circumferential manner on the mounting platforms, and the bottom adsorption limiting mechanism is inserted centrally on the mounting platform.

[0007] According to a preferred embodiment, a central connecting strip plate that connects to the double-row conveyor belt and parallel support strip plates arranged on both sides of the central connecting strip plate are provided on the bottom surface of the mounting platform; a rectangular guide slot is provided on the side of the mounting platform, and a through connecting slot communicating with the slot cavity and penetrating the top surface of the mounting platform is provided above the rectangular guide slot; a sealing and limiting plate is also embedded on the side of the mounting platform.

[0008] According to a preferred embodiment, the centering elastic limiting mechanism includes a guide slider slidably inserted into the rectangular guide slot, a beveled clamping plate inserted into the through connecting slot from the top of the mounting base and fixedly connected to the guide slider, and a limiting spring inserted into the rectangular guide slot to define the initial position of the guide slider.

[0009] According to a preferred embodiment, the suction cup of the bottom adsorption limiting mechanism is embedded in the center of the top surface of the mounting base, and the lower axial end of the suction cup is connected to a vacuum sleeve; a piston capable of dividing its cavity is provided inside the vacuum sleeve, and the piston is connected to a magnetic suction plate located below the vacuum sleeve via a lifting connecting rod, wherein the lower opening of the vacuum sleeve is also fitted with a sealing anti-detachment cover; a return spring is also fitted on the rod body of the lifting connecting rod located in the vacuum sleeve.

[0010] According to a preferred embodiment, a magnetic adjustment component and a stabilizing support plate are further provided between the two alignment mounting side plates and located below the double-row conveyor belt.

[0011] According to a preferred embodiment, the hydraulic lifting column of the elastic pressure-resistant component is installed on the bottom surface of the suspended mounting top plate, and a lower opening groove is connected to the lower axial end of the hydraulic lifting column. A pressure-resistant airbag that can partially extend outward from its lower opening is provided in the lower opening groove.

[0012] According to a preferred embodiment, the support plate of the adjustable testing mechanism is connected to the plate surface of the alignment mounting side plate facing the double-row conveyor belt by welding or flange connection, and a horizontal push telescopic rod is provided on the support plate. The end of the horizontal push telescopic rod is connected to a lifting adjustment component, and the movable end of the lifting adjustment component away from the horizontal push telescopic rod is connected to the test joint through a connecting plate.

[0013] The beneficial effects of this utility model are:

[0014] The composite limiting clamping assembly and elastic pressing assembly of this application cooperate to achieve six-way limiting of the filter in the test position, ensuring the accuracy and stability of the placement. This avoids insufficient displacement of the elastically limited filter caused by differences in the force parameters applied during single-sided or double-sided docking, ensuring the effectiveness and tightness of the docking connection, preventing the introduction of contact resistance and signal reflection, improving test accuracy, and avoiding intermodulation distortion under high power. Furthermore, the highly stable placement position avoids the problem of increasing the docking driving force to ensure the docking effect, preventing excessive docking and compression between the test connector and the filter interface, thus ensuring test accuracy and filter integrity. Both the composite limiting clamping assembly and the elastic pressing assembly of this application use non-rigid clamping methods to ensure the stability of the clamping and positioning, effectively avoiding the impact between the cavity filter surface and the clamping components caused by rigid clamping and rigid abutment, which leads to severe wear and undesirable deformation of the cavity filter surface, improving the stability of the clamping and limiting and the integrity of the cavity filter when it is limited. Finally, in order to ensure shipping efficiency and due to the limitations of human testing speed, the existing testing process usually adopts a sampling inspection method, which has certain inaccuracies. This application separates the loading and unloading and testing stations by setting multiple composite limit clamping components, so that loading and unloading and testing operations can be carried out simultaneously at different stations. This eliminates the exclusivity between existing processes, reduces the total time consumption during batch processing, and improves the efficiency of batch processing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a preferred test fixture for a high-power cavity filter proposed in this utility model;

[0016] Figure 2 This is a lateral planar schematic diagram of a preferred test fixture for a high-power cavity filter proposed in this utility model when the filter is subjected to multi-directional limiting clamping.

[0017] Figure 3 This is a schematic diagram of the composite limiting clamping assembly of a preferred test fixture for a high-power cavity filter proposed in this utility model.

[0018] Figure 4 This is an enlarged structural schematic diagram of the adjustable testing mechanism of a preferred high-power cavity filter test fixture proposed in this utility model. Detailed Implementation

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] The technical solutions provided by this utility model will be described in detail below with reference to the accompanying drawings and through embodiments. It should be noted that the descriptions of these embodiments are for the purpose of helping to understand this utility model, but do not constitute a limitation thereof. In some examples, because some implementation methods belong to existing or conventional technology, they are not described or are not described in detail. The serial numbers assigned to components in this document, such as "first," "second," etc., are only used to distinguish the described objects and do not have any sequential or technical meaning.

[0021] The following is a detailed explanation with reference to the accompanying drawings.

[0022] Example 1

[0023] This application provides a test fixture for a high-power cavity filter, which includes a support base 1, a support frame 2, a double-row conveyor belt 3, a composite limiting clamping assembly 4, an elastic pressing assembly 5, an adjustable testing mechanism 6, a magnetic adjustment component 7, and a stabilizing support plate 8.

[0024] according to Figure 1-4In one specific embodiment, the support base 1 provides an elevated mounting surface to raise the working height of the functional module. A support frame 2, capable of constructing multiple mutually symmetrical mounting plates, is mounted on the support base 1. A double-row conveyor belt 3, capable of directional translation of the filter under test (DUT), passes through a transverse channel defined by the multiple mounting plates constructed by the support frame 2. A composite limiting clamping assembly 4, spaced apart, is provided on the double-row conveyor belt 3 to limit the DUT, allowing it to intermittently translate with the double-row conveyor belt 3 without relative motion. An elastic pressure assembly 5, capable of assisting in defining the test position of the DUT by pressing down, is provided on the suspended mounting top plate 22 of the support frame 2. An adjustable positioning test mechanism 6, adjustable to mate with the DUT conveyed by the double-row conveyor belt 3, is provided on the parallel and aligned mounting side plates 23 on both sides of the support frame 2. Between the two aligned mounting side plates 23, a magnetic adjustment component 7 is provided below the double-row conveyor belt 3, capable of changing the working posture of the bottom adsorption limiting mechanism 43, and a stabilizing support plate 8 provides auxiliary support. The magnetic adjustment component 7 can cooperate with the bottom adsorption limiting mechanism 43 to adsorb and limit the filter under test onto the mounting platform 41 under negative pressure. The stabilizing support plate 8 assists in limiting the height of the transmission plane constructed by the double-row conveyor belt 3 in a way that provides a stable support plane, so as to prevent the double-row conveyor belt 3 from shifting or deforming.

[0025] The composite limiting clamping component 4 and the elastic pressing component 5 configured in this application cooperate to achieve six-way limiting of the filter in the test position, ensuring the accuracy and stability of the placement. This avoids insufficient displacement of the elastically limited filter caused by differences in the force parameters applied on one or both sides during insertion, ensuring the effectiveness and tightness of the insertion connection, preventing the introduction of contact resistance and signal reflection, improving test accuracy, and avoiding intermodulation distortion under high power. Furthermore, the highly stable placement position avoids the problem of increasing the insertion driving force to ensure the insertion effect, preventing excessive mating and compression between the test connector and the filter interface, thus ensuring the accuracy of the test and the integrity of the filter. The composite limiting clamping component 4 and the elastic pressing component 5 in this application both adopt a non-rigid clamping method to ensure the stability of the clamping and positioning. This effectively avoids the impact between the cavity filter surface and the clamping component caused by rigid clamping and rigid contact, which would lead to severe wear and abnormal deformation of the cavity filter surface. This improves the stability of the clamping and limiting and the integrity of the cavity filter when it is limited. Finally, to address the shortcomings of existing inspection processes, which often use sampling inspection to ensure shipping efficiency and are limited by the speed of manual testing, resulting in certain inaccuracies, this application separates the loading / unloading and testing stations by setting multiple composite limiting clamping components 4. This allows loading / unloading and testing operations to be performed simultaneously at different stations, eliminating the exclusivity between existing processes, reducing the total time consumption during batch processing, and improving the efficiency of batch processing. The adjustable testing mechanism 6 in this application can adjust its position according to actual needs to adapt to the insertion and docking of filter interfaces at different points, thereby improving the applicability of its testing docking.

[0026] Preferably, the four corners of the suspended mounting plate 22 are connected to the support base 1 through support columns 21 with bolt flanges at both ends, thereby constructing a suspended mounting plane.

[0027] Preferably, the double-row conveyor belt 3 is a conveying structure with two parallel and synchronously conveying belts, and is also equipped with double transmission wheels that match the two belts. This allows for a central gap between the transmission wheels, facilitating the effective and conflict-free translation of the composite limiting clamping assembly 4 extending below the belt. Preferably, the double-row conveyor belt 3 can be a PYD900 type double-row synchronous belt conveyor line that supports formula-driven size modification, embedded installation, photoelectric positioning accuracy of ±0.5mm, modular workstations, and adjustable initial workstation, intermittent cycle, and step distance.

[0028] Preferably, this application is mainly used to test the LUY series high-power cavity filters produced independently. Interfaces are provided on both sides of the filter, and the height and specific position of the interface vary slightly depending on the actual model. Therefore, before testing different models of products, the operator needs to manually adjust the initial position, intermittent cycle and single step distance of the double conveyor belt 3 according to the actual situation, and also needs to adjust the height of the adjustable testing mechanism 6 simultaneously.

[0029] Preferably, the composite limiting clamping assembly 4 includes a mounting base 41, a centering elastic limiting mechanism 42, and a bottom adsorption limiting mechanism 43. Preferably, a plurality of mounting bases 41 are arranged at intervals on the double-row conveyor belt 3 in a manner that allows the testing station, clamping station, and disassembly station to be separated from each other and the above operations to be performed at different positions, so as to follow the double-row conveyor belt 3 in a step-by-step translation, thereby orderly allowing the batch-processed filters under test to pass through the testing station in sequence. Preferably, multiple centering elastic limiting mechanisms 42 are arranged in a circumferential interval on the mounting base 41, which can cooperate with each other to elastically center and limit the filter under test on its top surface. Preferably, a bottom adsorption limiting mechanism 43 is inserted centrally on the central axis of the mounting base 41, penetrating its body and adjustablely adsorbing the filter under test with negative pressure.

[0030] Preferably, a central connecting strip 411 fixedly connected to the double-row conveyor belt 3 and parallel support strips 412 aligned on both sides of the central connecting strip 411 and movably abutting against the double-row conveyor belt 3 are provided on the bottom surface of the mounting platform 41. Preferably, a rectangular guide slot 413 is provided on the side of the mounting platform 41. More preferably, a through connecting groove 414 communicating with the cavity of the rectangular guide slot 413 and penetrating the top surface of the mounting platform 41 is provided above the rectangular guide slot 413. More preferably, a blocking limiting plate 415 is also installed on the side of the mounting platform 41 by countersunk screws, which can block the end openings of the rectangular guide slot 413 and the through connecting groove 414 and limit the movement range of the centering elastic limiting mechanism 42.

[0031] Preferably, the centering elastic limiting mechanism 42 includes a guide slider 421 slidably inserted into a rectangular guide slot 413, a beveled clamping plate 422 inserted from the top of the mounting base 41 through a through-connecting slot 414 and fixedly connected to the guide slider 421, and a limiting spring 423 inserted into the rectangular guide slot 413 to define the initial position of the guide slider 421. Preferably, the two sets of limiting springs 423 arranged in alignment and parallel to each other have equal structural strength and elastic potential energy, thereby achieving the centering clamping of the filter under test by alignment and clamping. That is, the four sets of centering elastic limiting mechanisms 42 effectively limit the filter under test to the center of the top surface of the mounting base 41 by centering elastic clamping.

[0032] Preferably, the bottom adsorption limiting mechanism 43 includes a suction cup 431, a vacuum sleeve 432, a sealing anti-detachment cover 433, a piston 434, a lifting connecting rod 435, a magnetic suction plate 436, and a return spring 437. Preferably, the suction cup 431 of the bottom adsorption limiting mechanism 43 is embedded in the center of the top surface of the mounting base 41 in a manner parallel to the top surface of the mounting base 41. Preferably, the lower axial end of the suction cup 431 is connected to a vacuum sleeve 432 that penetrates the bottom surface of the mounting base 41. Preferably, a piston 434 is provided inside the vacuum sleeve 432 to divide its cavity. Preferably, the piston 434 is connected to the magnetic suction plate 436 located below the vacuum sleeve 432 via the lifting connecting rod 435. More preferably, the lower opening of the vacuum sleeve 432 is also threadedly fitted with a sealing anti-detachment cover 433 to prevent the piston 434 from slipping out. Preferably, a return spring 437, capable of driving the lifting linkage 435 to undergo a return upward movement, is also fitted onto the rod body within the vacuum sleeve 432. Preferably, the magnetic attraction force provided by the magnetic adjustment component 7 is at least twice the return elastic force generated by the return spring 437 when compressed, to ensure the strength and effectiveness of the downward traction of the magnetic plate 436 by the magnetic adjustment component 7. Specifically, as the magnetic plate 436 continues to descend under magnetic traction, the distance between the magnetic plate 436 and the magnetic adjustment component 7 gradually decreases as the return spring 437 gradually compresses and the return elastic force gradually increases, thereby gradually increasing the magnetic attraction strength. This ensures that, under energized conditions, the magnetic attraction pulling force of the magnetic adjustment component 7 is always greater than the return elastic force of the return spring 437, achieving sufficient downward pull. Specifically, the maximum downward pull distance is the point where the return elastic force of the return spring 437 exceeds the threshold point of the magnetic attraction pulling force of the magnetic adjustment component 7 or the point corresponding to the maximum compression of the return spring 437.

[0033] Preferably, the elastic pressure-resistant assembly 5 includes a hydraulic lifting column 51, a lower opening groove 52, and a pressure-resistant airbag 53. Preferably, the hydraulic lifting column 51 of the elastic pressure-resistant assembly 5 is mounted on the bottom surface of the suspended mounting plate 22 via welding or a flange with connecting bolts and fixedly connected to its column body. Preferably, the hydraulic lifting column 51 can be a PER-300 type high-precision electric-driven hydraulic lift. Preferably, the lower opening groove 52 is connected to the lower axial end of the hydraulic lifting column 51 by welding or other means. Preferably, a pressure-resistant airbag 53, capable of partially extending outward from its lower opening, is provided in the lower opening groove 52 by a limiting adhesive mounting method. Preferably, a pressure sensor is disposed at the center of the bottom surface of the pressure-relief airbag 53, and the pressure sensor is connected to a controller that controls the movement of the hydraulic lifting column 51. When the pressure detected by the pressure sensor reaches a preset threshold, such as 20N, the controller issues a control command based on the data feedback to stop the hydraulic lifting column 51 from further downward movement. This achieves appropriate downward pressure on the filter under test, avoiding rigid pressure that could damage the filter or cause undesirable deformation. Specifically, the above control logic and the threshold value are manually set by the operator on the operating device with the built-in controller. This achieves stable downward pressure limit for filters under test with different intensities while reducing the risk of damage from the downward pressure limit. That is, in the above control logic, the underlying process is pre-programmed by relevant technical personnel, and the operator only needs to change the parameter calibration values ​​in the program according to actual needs.

[0034] Preferably, the adjustable testing mechanism 6 includes a support plate 61, a horizontal push telescopic rod 62, a lifting adjustment component 63, a connecting plate 64, and a test connector 65. Preferably, the support plate 61 of the adjustable testing mechanism 6 is connected to the surface of the mounting side plate 23 facing the double-row conveyor belt 3 by welding or flange connection. More preferably, a horizontally positioned horizontal push telescopic rod 62 is provided on the support plate 61 by welding or bolt connection. Preferably, the horizontal push telescopic rod 62 can be a straight telescopic rod, which is effectively suitable for linear push-pull scenarios and precisely controls the plug insertion depth, for example, the electro-hydraulic actuator of the KFT series. Preferably, the end of the horizontal push telescopic rod 62 is connected to a lifting adjustment component 63 that can adjust the actual working height of the test connector 65 and can slide in contact with the support plate 61. More preferably, the movable end of the lifting adjustment component 63 away from the horizontal push telescopic rod 62 is connected to the test connector 65 through the connecting plate 64. Preferably, the test connector 65 is connected to the test equipment via an external lead wire, thereby enabling the test equipment to communicate with the filter signal. This allows the test equipment, with its pre-set test mechanisms and procedures, to periodically and automatically start and stop to complete the filter test. Preferably, the test connector 65 can be an FP3c type quick-connect connector with low insertion loss ≤0.1dB, which can be connected to existing test equipment such as signal generation and amplification equipment, power monitoring and analysis equipment, etc., via lead wires as needed.

[0035] Preferably, the lifting adjustment component 63 includes a guide vertical groove 631, an adjusting screw 632, a T-shaped lifting block 633, and a rotary adjusting disc 634. Preferably, the guide vertical groove 631 of the lifting adjustment component 63 is connected to the telescopic end of the horizontal push telescopic rod 62. More preferably, a rotatable adjusting screw 632 is vertically inserted into the guide vertical groove 631. Preferably, a T-shaped lifting block 633, whose direction of movement is defined by the guide vertical groove 631 and extends outside the guide vertical groove 631, is threaded onto the adjusting screw 632. More preferably, a connecting disc 64 is mounted on the end face of the T-shaped lifting block 633 on the outer side of the guide vertical groove 631 by welding or bolting. Preferably, a rotary adjusting disc 634 is provided at the axial upper end of the adjusting screw 632 passing through the guide vertical groove 631, which is convenient for the operator to manually drive its rotation. Specifically, when docking different chamber filters, the operator first rotates the adjusting screw 632 by turning the rotating adjusting plate 634, thereby changing the actual working height of the T-shaped lifting block 633 to adjust the height of the test connector 65.

[0036] Preferably, the magnetic adjustment component 7 has alignment connecting rods 71 ​​on both sides to define its suspended working position. Specifically, the magnetic adjustment component 7 is an NF series electromagnetic force plate that can periodically provide intermittent electromagnetic attraction by periodically switching the circuit on and off. Preferably, the magnetic adjustment component 7 is connected to an external controller and power supply through wires attached to the alignment connecting rods 71, and periodically generates electromagnetic traction force by opening and closing the electrical circuit according to the operator's needs. Preferably, the two L-shaped plates of the two symmetrically arranged stabilizing support plates 8 are connected to the alignment mounting side plate 23 through connecting crossbars 81. Preferably, the L-shaped plates of the stabilizing support plates 8 have downward curved plates at their ends in the length direction to reduce the risk of scratch damage between the double-row conveyor belt 3 and the plate ends, and to improve the smoothness of the translation of the double-row conveyor belt 3 on the L-shaped plates.

[0037] During use, the operator manually adjusts the centering elastic limiting mechanism 42 at the clamping station to place the filter on the mounting platform 41. The eight centering elastic limiting mechanisms 42 work together to clamp the filter in a coordinated manner, thus achieving centered placement. As the mounting platform 41 moves in a step-by-step directional translation with the double-row conveyor belt 3, it moves onto the stabilizing support plate 8 to ensure the high stability of the constructed translational plane. Once in the set test position, firstly, the hydraulic lifting column 51 drives the lower opening slot 52 and the pressure airbag 53 to move down and press down to limit the position of the filter on the mounting platform 41. Then, the circuit connected to the magnetic adjustment component 7 is connected to generate a magnetic attraction force, which changes the working state of the bottom adsorption limiting mechanism 43. This allows the bottom adsorption limiting mechanism 43 to adsorb and position the filter on the mounting platform 41 by generating a closed cavity negative pressure. Then, the horizontal extension and retraction of the horizontal push telescopic rod 62 is used to connect the single-sided or double-sided test connector 65 to the filter as needed. Six-directional positioning can effectively improve the stability of the filter being clamped, preventing it from shifting when subjected to unbalanced external forces during insertion, thus ensuring the accuracy of insertion.

[0038] Preferably, the electrical components involved in this application, such as the double-row conveyor belt 3, hydraulic lifting column 51, horizontal push telescopic rod 62, and magnetic adjustment component 7, are all electrically connected to the controller and power supply. The control method of this application is controlled by the controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, this utility model is only used to protect the mechanical device and its mechanical structural features. Therefore, this utility model will not explain the control method and circuit connection in detail.

[0039] For surface connections between components not explicitly specified in this application, conventional bolt connections, snap-fit ​​connections, or fixed connections such as welding can be used. As these are conventional connection methods, this application will not elaborate further on this part. Specifically, the connecting ends of the assembled components all form flange structures, and the two flange structures are connected by bolts, gaskets, or other structures.

[0040] This utility model is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this utility model. However, regardless of any changes in shape or structure, any technical solution falling within the scope of the claims of this utility model is within the protection scope of this utility model. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A test fixture for a high-power cavity filter, comprising a support base (1), characterized in that, A support frame (2) capable of constructing multiple mutually non-uniform mounting plates is provided on the support base (1), and a double-row conveyor belt (3) capable of driving the filter under test to perform directional translation is passed through the transverse channel defined by the support frame (2). A composite limiting clamping assembly (4) capable of limiting the filter under test and arranged at intervals is provided on the double-row conveyor belt (3). An elastic pressure component (5) is provided on the suspended mounting top plate (22) of the support frame (2) to assist in defining the test position of the filter under test by pressing down and positioning. An adjustable position test mechanism (6) is provided on the alignment mounting side plates (23) of the support frame (2) located on both sides of the double-row conveyor belt (3).

2. The test fixture for the high-power cavity filter as described in claim 1, characterized in that, The composite limiting clamping assembly (4) includes a mounting base (41), a centering elastic limiting mechanism (42), and a bottom adsorption limiting mechanism (43), wherein, Several of the aforementioned mounting platforms (41) are spaced apart on the double-row conveyor belt (3); Multiple centering elastic limiting mechanisms (42) are arranged in a circumferentially spaced manner on the mounting base (41), and the bottom adsorption limiting mechanism (43) is inserted in the center of the mounting base (41).

3. The test fixture for the high-power cavity filter as described in claim 2, characterized in that, On the bottom surface of the mounting platform (41), there is a central connecting strip (411) that connects to the double-row conveyor belt (3) and parallel support strips (412) arranged on both sides of the central connecting strip (411). A rectangular guide slot (413) is provided on the side of the mounting base (41), and a through connecting slot (414) is provided above the rectangular guide slot (413) to communicate with its cavity and penetrate through the top surface of the mounting base (41). A sealing and limiting plate (415) is also embedded on the side of the mounting base (41).

4. The test fixture for the high-power cavity filter as described in claim 3, characterized in that, The centering elastic limiting mechanism (42) includes a guide slider (421) slidably inserted into the rectangular guide slot (413), an inclined clamp (422) inserted into the through connecting slot (414) from the top of the mounting base (41) and fixedly connected to the guide slider (421), and a limiting spring (423) inserted into the rectangular guide slot (413) to limit the initial position of the guide slider (421).

5. The test fixture for the high-power cavity filter as described in claim 4, characterized in that, The suction cup (431) of the bottom adsorption limiting mechanism (43) is embedded in the center of the top surface of the mounting base (41), and the lower axial end of the suction cup (431) is connected to the air extraction sleeve (432). A piston (434) capable of dividing the cavity is provided inside the suction sleeve (432), and the piston (434) is connected to a magnetic suction plate (436) located below the suction sleeve (432) via a lifting connecting rod (435). The lower opening of the suction sleeve (432) is also fitted with a sealing anti-detachment cover (433); a return spring (437) is also fitted on the rod of the lifting connecting rod (435) located in the suction sleeve (432).

6. The test fixture for the high-power cavity filter as described in claim 5, characterized in that, A magnetic adjustment component (7) and a stabilizing support plate (8) are also provided between the two alignment mounting side plates (23) and located below the double-row conveyor belt (3).

7. The test fixture for the high-power cavity filter as described in claim 6, characterized in that, The hydraulic lifting column (51) of the elastic pressure-resistant component (5) is installed on the bottom surface of the suspended mounting plate (22), and a lower opening groove (52) is connected to the lower axial end of the hydraulic lifting column (51). A pressure-resistant airbag (53) that can partially extend outward from its lower opening is provided in the lower opening groove (52).

8. The test fixture for the high-power cavity filter as described in claim 7, characterized in that, The support plate (61) of the adjustable position testing mechanism (6) is connected to the plate surface of the alignment mounting side plate (23) facing the double-row conveyor belt (3) by welding or flange connection, and a horizontal push telescopic rod (62) is provided on the support plate (61). The end of the horizontal push telescopic rod (62) is connected to a lifting adjustment component (63), and the movable end of the lifting adjustment component (63) away from the horizontal push telescopic rod (62) is connected to the test connector (65) through a connecting plate (64).

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