A quick-clamping and positioning fixture for attenuator performance testing

Abstract

This application relates to the field of radio frequency device testing technology, and in particular to a quick-clamping and positioning fixture for attenuator performance testing, comprising: a base plate with pads and ribs fixed at both ends of the top of the base plate; a testing structure including a movable placement block and a fixed placement block; an elbow clamping mechanism mounted on the pads; a test wire clamping mechanism for clamping test wire adapters; an attenuator testing cavity, formed by cutting the attenuator shell along its middle section to form cavity one and cavity two, cavity one and cavity two being mounted on the fixed placement block and movable placement block respectively via adapters; a centering structure mounted on the attenuator testing cavity; and a feeding mechanism mounted on the fixed placement block and movable placement block. This application achieves quick clamping of the attenuator by driving the movable placement block with the elbow clamping mechanism, replacing the traditional rotary tightening method with a single lever operation, significantly shortening the testing cycle of a single attenuator and significantly improving the production efficiency of batch testing.

Description

Technical Field

[0001] This application relates to the field of radio frequency device testing technology, and in particular to a quick clamping and positioning fixture for attenuator performance testing. Background Technology

[0002] Attenuators are passive devices widely used in microwave and radio frequency systems. Their key performance parameters, such as insertion loss and return loss, need to be accurately tested using a network analyzer. In existing technology, the conventional method for attenuator performance testing is as follows: the attenuator housing assembly 1 and assemblies 2 are respectively fixedly connected to the test ports of the network analyzer; the attenuator under test is placed into the cavity of the housing assembly 1; and then the housing assembly 1 and assemblies 2 are manually rotated and tightened, clamping the attenuator between the two cavities to complete the test.

[0003] The aforementioned prior art has the following drawbacks: First, the testing efficiency is low. Each attenuation filter test requires a complete cycle of loosening, removing, replacing, and tightening. In mass production testing scenarios, this frequent rotation is extremely time-consuming and cannot meet the efficiency requirements of mass production line testing. Second, the test reliability is poor. The amount of thread tightening depends on the operator's judgment by feel, and it is difficult to keep the tightening torque consistent. If the tightening is insufficient, there will be a gap between the two cavity end faces, which will lead to RF signal leakage and increase the deviation of the test results. If the tightening is excessive, it may damage the end face of the attenuator. Third, in the traditional threaded tightening method, the central axes of the two cavities are prone to relative misalignment during rotation, resulting in a large error in the coaxiality of the connection. This causes uneven lateral force on the attenuator within the cavity, affecting the accuracy of the test.

[0004] Based on this, those skilled in the art have proposed a quick clamping and positioning fixture for attenuator performance testing, providing a new solution to the aforementioned technical problems. Summary of the Invention

[0005] To address the problems mentioned in the background art, this application provides a quick clamping and positioning fixture for attenuator performance testing.

[0006] The quick-clamping and positioning fixture for attenuator performance testing provided in this application adopts the following technical solution: A quick-clamping and positioning fixture for attenuator performance testing includes: The base plate has pads and ribs fixed at its top two ends respectively; The test structure includes a movable placement block and a fixed placement block. A first XY axis fine-tuning platform is fixedly installed on the rib plate. The fixed placement block is fixedly installed on the first XY axis fine-tuning platform. A slider is slidably installed on the top of the base plate. A second XY axis fine-tuning platform is fixedly installed on the top of the slider. The movable placement block is fixedly installed on the second XY axis fine-tuning platform. An elbow clamp mechanism, mounted on the pad, is used to drive the movable placement block to perform displacement movement; A test lead clamping mechanism is used to clamp the test lead adapter. The movable placement block and the fixed placement block have mounting cavities on their inner sides, and the test lead clamping mechanism is installed inside the mounting cavity. The attenuator test chamber is formed by cutting the attenuator shell along the middle section to form chamber one and chamber two. Chamber one and chamber two are respectively installed on the fixed placement block and the movable placement block through adapters. The centering structure is installed in the attenuator test cavity and is used to center and align the cavity one and the cavity two during testing; A feeding mechanism is installed on the fixed placement block and the movable placement block, and is used to feed the tested attenuation sheet when the fixed placement block and the movable placement block are separated.

[0007] Optionally, the elbow clamp mechanism includes an elbow clamp wall rotatably mounted on one end of the top of the pad, a connecting plate rotatably connected to the middle of the elbow clamp wall, a push rod rotatably connected to the end of the connecting plate away from the elbow clamp wall, the push rod being slidably mounted on the inner side of the pad, and the end of the push rod being fixedly connected to the movable placement block.

[0008] Optionally, the centering structure includes a fixed centering ring and a floating centering ring. The fixed centering ring and the floating centering ring are respectively threaded to the outside of cavity one and cavity two. The fixed centering ring has a fixed conical surface on its inner side near the end of the floating centering ring. The floating centering ring has a floating conical surface on its outer side near the end of the fixed centering ring that matches the fixed conical surface. The floating centering ring has an avoidance groove on its inner side near the end of the fixed centering ring to avoid cavity one during testing.

[0009] Optionally, the test line clamping mechanism includes a clamping block one fixedly installed inside the mounting cavity and a clamping block two slidably installed inside the mounting cavity. A push screw is rotatably connected to the clamping block two, and the push screw is threadedly connected to the inside of the mounting cavity.

[0010] Optionally, the feeding mechanism includes slide rails fixed to the top and bottom of the fixed placement block, a sliding angle plate slidably mounted on the slide rails, a first guide rod mounting seat fixedly mounted on the fixed placement block at the end of the slide rail away from the movable placement block, first guide rods fixed on both sides of the first guide rod mounting seat, the sliding angle plate slidably connected to the outside of the first guide rods, a second spring sleeved on the outside of the first guide rods, the two ends of the second springs respectively connected to the first guide rod mounting seat and the sliding angle plate; support blocks fixed on the fixed placement block at both sides of the slide rails, a second guide rod fixed on the end of the support block near the movable placement block, guide plates slidably mounted on the outside of the two second guide rods at the same horizontal position, a third spring sleeved on the outside of the second guide rods, the two sides of the third springs respectively connected to the support block and the guide plate.

[0011] Optionally, the guide plate has a vertically formed movable groove on its inner side, and a slide rod is vertically inserted through the guide plate at the movable groove. The slide rod is slidably connected to the guide plate. The end of the slide rod near the attenuator test cavity extends out of the guide plate and is fixed with an arc-shaped clamping plate. The inner wall of the arc-shaped clamping plate is set as an arc surface adapted to the outer wall of the attenuator. A drive rod is horizontally arranged on the inner side of the guide plate. The drive rod is fixed to the corresponding sliding corner plate and passes through the inner side of the slide rod and is slidably connected to it.

[0012] Optionally, the drive rod includes an inclined drive section and a straight section. The inclined drive section is fixedly connected to the corresponding sliding angle plate. The straight section is located at one end near the movable placement block. The inclined drive section is inclinedly inserted through the slide rod and slidably connected to it. The inclined drive section is slidably installed inside the movable groove.

[0013] Optionally, a drive mounting plate is fixedly installed at the top and bottom of the movable placement block opposite to one end of the straight section. The drive mounting plate has a connecting groove adapted to the straight section on its inner side. A snap-fit ​​rod is slidably installed on the top inner side of the drive mounting plate. A fourth spring is sleeved on the outer side of the snap-fit ​​rod. The two ends of the fourth spring are respectively connected to the snap-fit ​​rod and the drive mounting plate. The bottom of the snap-fit ​​rod extends into the connecting groove. A snap-fit ​​groove matching the snap-fit ​​rod is opened on the straight section. In the natural state, under the action of the second spring, the drive rod drives the two slide rods away from the arc-shaped clamping plate. Under the action of the second spring and the third spring, the guide plate abuts against the slide rail. At this time, the two arc-shaped clamping plates are exactly above and below the attenuation plate to be tested.

[0014] Optionally, the slots on the two straight sections are laterally staggered, so that when the movable placement block moves away from the fixed placement block, the locking rod and the slot cooperate to drive the two guide plates to move at different distances, so that the attenuation plate held by the two arc-shaped clamps tilts and falls.

[0015] Optionally, a spring base is fixed to the top of the base plate, and a first spring is provided between the spring base and the slider. The two ends of the first spring are respectively connected to the spring base and the slider. Chamfers are provided on the inner sides of the cavity one and the cavity two that are close to each other.

[0016] In summary, this application includes at least one of the following beneficial technical effects: This invention enables rapid clamping of attenuator plates by driving a movable placement block through an elbow clamping mechanism, replacing the traditional rotary tightening method with a single lever operation, which significantly shortens the testing cycle of a single attenuator plate and significantly improves the production efficiency of batch testing. This invention ensures high coaxial accuracy when cavity one and cavity two are docked by the guide cooperation of the fixed conical surface and the floating conical surface of the centering structure, eliminating the axial offset problem caused by the traditional manual tightening method and improving the accuracy and consistency of test results. The feeding mechanism of the present invention realizes a complete automatic feeding process by automatically clamping the attenuator after the cavity is separated, automatically pulling the attenuator out of the cavity, and automatically releasing it after the elastic force is accumulated through the timing coordination of the clamping rod and the clamping slot. It eliminates the need for manual removal of the attenuator, reduces the labor intensity of the operator, and effectively avoids secondary damage to the attenuator during manual removal. The present invention can precisely fine-tune the horizontal position of the fixed placement block and the movable placement block respectively through the first XY axis fine-tuning platform and the second XY axis fine-tuning platform, so as to ensure that the overall coaxial accuracy of the device meets the requirements of high-precision radio frequency testing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the main structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0020] Figure 4 This is a schematic diagram of the structure of the attenuation plate test chamber of the present invention.

[0021] Figure 5 This is a schematic diagram of the central structure of the present invention.

[0022] Figure 6 This is a cross-sectional schematic diagram of the central structure of the present invention.

[0023] Figure 7 This is a schematic diagram of the fixed centering ring and the floating centering ring of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the feeding mechanism of the present invention. Figure 1 .

[0025] Figure 9 This is a side view of the feeding mechanism of the present invention.

[0026] Figure 10 This is a front view structural schematic diagram of the feeding mechanism of the present invention.

[0027] Figure 11 This is a three-dimensional structural diagram of the feeding mechanism of the present invention. Figure 2 .

[0028] Figure 12 This is a schematic diagram of the structure of the snap-fit ​​rod and the connecting groove of the present invention. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figure 1-12 The present invention will now be described in further detail.

[0030] Reference Figures 1 to 3 This application provides a quick-clamping and positioning fixture for attenuator performance testing, using a base plate 1 as the overall mounting base. A pad 2 is fixed to one end of the top of the base plate 1 along the axial direction, and a rib 3 is fixed to the other end. A guide rail extending axially is provided on the top of the base plate 1, and a slider 14 is slidably mounted on the guide rail. A second XY-axis fine-tuning platform 15 is fixedly mounted on the top of the slider 14, and a movable placement block 8 is fixedly mounted on the second XY-axis fine-tuning platform 15, allowing it to slide along the axial direction of the base plate 1. A first XY-axis fine-tuning platform 4 is fixedly mounted on the rib 3, and a fixed placement block 9 is fixedly mounted on the first XY-axis fine-tuning platform 4, remaining stationary relative to the base plate 1. By adjusting the first XY-axis fine-tuning platform 4 and the second XY-axis fine-tuning platform 15 respectively, the horizontal positions of the fixed placement block 9 and the movable placement block 8 can be precisely fine-tuned, ensuring that the axial height of the attenuator test chamber 18 mounted on both is accurately aligned. A spring base 16 is fixed on the top of the base plate 1. A first spring 17 is provided between the spring base 16 and the slider 14. The two ends of the first spring 17 are respectively connected to the spring base 16 and the slider 14, providing a reset force for the movable placement block 8 in the direction away from the fixed placement block 9, so that after the elbow clamp mechanism is released, the movable placement block 8 can automatically return to the initial position to be loaded.

[0031] Reference Figures 1 to 2An elbow clamping mechanism is installed on the pad 2 to drive the movable placement block 8 to move towards the fixed placement block 9, achieving rapid clamping of the two cavities. The elbow clamping mechanism includes an elbow clamping wall 5 rotatably mounted on one end of the top of the pad 2, a connecting plate 6 rotatably connected to the middle of the elbow clamping wall 5, and a push rod 7 rotatably connected to the end of the connecting plate 6 away from the elbow clamping wall 5. The push rod 7 is slidably mounted on the inner side of the pad 2, and its end is fixedly connected to the movable placement block 8. When the operator presses down on the elbow clamping wall 5, the rotation of the elbow clamping wall 5 is converted into axial linear displacement of the push rod 7 through the hinge transmission of the connecting plate 6, pushing the movable placement block 8 towards the fixed placement block 9. When the elbow clamping wall 5 passes the dead point, it enters a self-locking state, ensuring that the movable placement block 8 will not retract due to external interference during the test, and the clamping state is stable and reliable.

[0032] Reference Figure 4 The attenuator test chamber 18 is formed by cutting the attenuator shell along its middle section, creating two semi-cavities: cavity one 1801 and cavity two 1802. Cavities one 1801 and cavity two 1802 are respectively mounted on the fixed placement block 9 and the movable placement block 8 via adapters. Their end faces are joined together to form a complete test chamber, where the attenuator is clamped for performance testing. Both cavities one 1801 and cavity two 1802 have chamfered edges 181 on their inner sides at their closest points to eliminate sharp edges and protect the attenuator from scratches during installation and removal. Both the movable placement block 8 and the fixed placement block 9 have mounting cavities 10 on their inner sides. Test lead clamping mechanisms are installed in the mounting cavities 10 to hold the test lead adapter. The test lead clamping mechanism includes a first clamping block 11 fixedly installed inside the mounting cavity 10 and a second clamping block 12 slidably installed inside the mounting cavity 10. A push screw 13 is rotatably connected to the second clamping block 12, and the push screw 13 is threaded into the inside of the mounting cavity 10. Rotating the push screw 13 drives the second clamping block 12 to slide towards the first clamping block 11, clamping and fixing the test lead adapter between the two clamping blocks. The clamping force is stable and can be repeatedly adjusted.

[0033] Reference Figures 4 to 7The centering structure 20 is installed on the outside of the attenuator test chamber 18, and includes a fixed centering ring 201 and a floating centering ring 202. The fixed centering ring 201 is threaded to the outside of the first chamber 1801, and the floating centering ring 202 is threaded to the outside of the second chamber 1802. The fixed centering ring 201 has a fixed conical surface 2011 on its inner side near the floating centering ring 202, and the floating centering ring 202 has a floating conical surface 2021 on its outer side near the fixed centering ring 201, which is adapted to the shape of the fixed conical surface 2011. When the movable placement block 8 moves closer to the fixed placement block 9, the floating conical surface 2021 enters the fixed conical surface 2011 and automatically centers under the guidance of the conical surface, so that the central axis of the first chamber 1801 and the second chamber 1802 are highly precisely coincident. The floating centering ring 202 has an inner clearance groove 2022 on the inner side of the end near the fixed centering ring 201, which provides axial clearance space for the end of the cavity 1801 and prevents the end face of the cavity from being damaged by excessive axial pressure.

[0034] Reference Figures 8 to 12 The feeding mechanism 19 is installed on the fixed placement block 9 and the movable placement block 8, and is used to automatically pick up and send out the tested attenuation plate after the cavity 1801 and the cavity 21802 are separated.

[0035] The slide rail 1901 of the feeding mechanism 19 is fixed to the top and bottom of the fixed placement block 9 and extends axially. A sliding angle plate 1902 is slidably mounted on the slide rail 1901. A first guide rod mounting seat 1923 is fixedly mounted on the fixed placement block 9 at the end of the slide rail 1901 away from the movable placement block 8. First guide rods 1903 are fixed on both sides of the first guide rod mounting seat 1923. The sliding angle plate 1902 is slidably sleeved on the outside of the first guide rods 1903. A second spring 1904 is sleeved on the outside of the first guide rods 1903. The two ends of the second spring 1904 are respectively connected to the first guide rod mounting seat 1923 and the sliding angle plate 1902. Support blocks 1905 are fixed on both sides of the slide rail 1901 on the fixed placement block 9. A second guide rod 1906 is fixed on one end of the support block 1905 near the movable placement block 8. Guide plates 1908 are slidably installed on the outer side of the two second guide rods 1906 at the same horizontal position. A third spring 1907 is sleeved on the outer side of the second guide rod 1906. The two sides of the third spring 1907 are respectively connected to the support block 1905 and the guide plate 1908.

[0036] A movable groove 1921 is vertically formed on the inner side of the guide plate 1908. A slide rod 1909 is vertically inserted through the movable groove 1921 and is slidably connected to the guide plate 1908. The end of the slide rod 1909 near the attenuator test chamber 18 extends out of the guide plate 1908 and is fixed with an arc-shaped clamping plate 1920. The inner wall of the arc-shaped clamping plate 1920 is set as an arc surface adapted to the outer wall of the attenuator. A drive rod 1922 is horizontally arranged on the inner side of the guide plate 1908 and is fixedly connected to the corresponding sliding angle plate 1902. The drive rod 1922 is horizontally inserted through the inner side of the slide rod 1909 and is slidably connected to it. The drive rod 1922 includes an inclined drive section 19221 and a straight section 19222. The inclined drive section 19221 is fixedly connected to the corresponding sliding angle plate 1902, and the straight section 19222 is located at one end near the movable placement block 8. The tilting drive section 19221 is tilted through the inner side of the slide rod 1909 and slidably connected to it, while also slidably installed inside the movable groove 1921.

[0037] A drive mounting plate 1924 is fixedly installed at the top and bottom of the movable placement block 8, opposite to one end of the straight section 19222. The inner side of the drive mounting plate 1924 has a connecting groove 1927 that matches the outer diameter of the straight section 19222. A snap-fit ​​rod 1925 is slidably installed on the inner side of the top of the drive mounting plate 1924. A fourth spring 1926 is sleeved on the outer side of the snap-fit ​​rod 1925. The two ends of the fourth spring 1926 are respectively connected to the snap-fit ​​rod 1925 and the drive mounting plate 1924. The bottom of the snap-fit ​​rod 1925 extends into the connecting groove 1927 under the elastic force of the fourth spring 1926. A slot 19223 that matches the cross-sectional shape of the snap-fit ​​rod 1925 is opened on the straight section 19222.

[0038] In another optional embodiment, the slots 19223 on the two straight sections 19222 are laterally staggered, so that when the movable placement block 8 moves away from the fixed placement block 9, the locking rod 1925 cooperates with the slots 19223 to drive the two guide plates 1908 to move at different distances, so that the attenuator clamped by the two arc-shaped clamps 1920 tilts and falls. Since the slots 19223 on the two straight sections 19222 are laterally staggered, during the retraction of the movable placement block 8, the axial positions of the locking rods 1925 on the upper and lower sides and their respective slots 19223 are different, resulting in a difference in the displacement of the upper and lower guide plates 1908 during the lateral plate pulling process. The two arc-shaped clamps 1920 generate a height difference, and the clamped attenuator tilts and falls to the lower side under the action of gravity, realizing controlled directional feeding and effectively avoiding damage caused by collision when the attenuator falls vertically.

[0039] The working principle of this invention is as follows: In its natural state, the second spring 1904 and the third spring 1907 are in a naturally extended state. The tilting drive section 19221, through its tilting cooperation with the slide rod 1909, converts the elastic force of the second spring 1904 into a vertical component force that drives the two slide rods 1909 and the arc-shaped clamping plate 1920 away from each other. At the same time, the guide plate 1908 abuts against the slide rail 1901 under the elastic force of the third spring 1907. At this time, the two arc-shaped clamping plates 1920 are located exactly above and below the installation position of the attenuator to be tested, which does not prevent the operator from installing the attenuator into the cavity 1801.

[0040] During clamping, the operator places the attenuator to be tested into cavity 1801, then presses down the elbow clamp wall 5. The connecting plate 6 drives the push rod 7 to push the movable placement block 8 and the slider 14 against the spring force of the first spring 17 towards the fixed placement block 9. During this approach, the straight section 19222 inserts into the connecting groove 1927 of the drive mounting plate 1924. At this time, the top of the locking rod 1925 is temporarily retracted into the drive mounting plate 1924 due to the pressure from the outer wall of the straight section 19222, and is in a compressed waiting state. As the movable placement block 8 continues to approach, the floating cone surface 2021 on the floating centering ring 202 enters the fixed cone surface 2011 of the fixed centering ring 201. Under the guidance of the cone surface, automatic centering is achieved, enabling cavity 1801 and cavity 2802 to achieve high-precision coaxial docking. The attenuator is clamped by the two cavities, completing the testing state. At this time, the elbow clamp wall 5 crosses the dead point and enters a self-locking state, maintaining stable clamping.

[0041] After the test is completed, the operator lifts the elbow clamp 5, the push rod 7 releases the thrust, and the movable placement block 8 begins to retract away from the fixed placement block 9 under the return force of the first spring 17. In the initial stage of retraction, cavity two 1802 separates from cavity one 1801 along with the movable placement block 8, the test cavity opens, and the attenuator remains in cavity one 1801; at the same time, the straight section 19222 gradually exits from the connecting groove 1927 as the movable placement block 8 retracts. When the straight section 19222 retracts to the slot 19223 and aligns with the locking rod 1925, the locking rod 1925 quickly pops out under the force of the fourth spring 1926 and inserts into the slot 19223, locking the drive rod 1922 and the movable placement block 8 together.

[0042] After the locking rod 1925 engages with the slot 19223, the movable placement block 8 continues to retract, pulling the drive rod 1922 horizontally via the locking rod 1925. During this process, the tilting drive section 19221 moves axially with the sliding angle plate 1902, converting the axial motion into a vertical force, causing the two sliding rods 1909 to move closer together. The two arc-shaped clamping plates 1920 gradually close from the top and bottom sides of the attenuator until they completely clamp the tested attenuator.

[0043] Once the two arc-shaped clamping plates 1920 have fully clamped the attenuator, they can no longer move closer together, and the vertical driving force of the tilting drive section 19221 on the slide rod 1909 disappears. Afterward, the movable placement block 8 continues to retract, pulling the drive rod 1922 along with the guide plate 1908 laterally along the second guide rod 1906 towards the movable placement block 8 via the locking rod 1925. This laterally pulls the attenuator clamped by the arc-shaped clamping plates 1920 out of the cavity 1801, and the attenuator falls naturally after being released from the cavity, completing the unloading process. During the overall displacement, the second spring 1904 and the third spring 1907 gradually increase their elasticity due to continuous stretching.

[0044] When the elastic force of the second spring 1904 and the third spring 1907 accumulates to be sufficient to overcome the retaining force of the locking rod 1925 on the slot 19223, the locking rod 1925 is pushed out of the slot 19223 by the elastic force, and the linkage between the drive rod 1922 and the movable placement block 8 is released. The elastic force of the second spring 1904 and the third spring 1907 drives the guide plate 1908 and the drive rod 1922 to return to their initial positions. At the same time, the tilting drive section 19221 drives the two arc-shaped clamping plates 1920 to move away from each other and return to the standby positions on the upper and lower sides of the attenuator to be tested, preparing for the clamping and unloading of the next attenuator.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A quick-clamping and positioning fixture for attenuator performance testing, characterized in that, include: The bottom plate (1) has pads (2) and ribs (3) fixed at both ends of its top. The test structure includes a movable placement block (8) and a fixed placement block (9). A first XY axis fine-tuning platform (4) is fixedly installed on the rib (3). The fixed placement block (9) is fixedly installed on the first XY axis fine-tuning platform (4). A slider (14) is slidably installed on the top of the base plate (1). A second XY axis fine-tuning platform (15) is fixedly installed on the top of the slider (14). The movable placement block (8) is fixedly installed on the second XY axis fine-tuning platform (15). An elbow clamp mechanism is installed on the pad (2) and is used to drive the movable placement block (8) to perform displacement movement; A test lead clamping mechanism is used to clamp the test lead adapter. The movable placement block (8) and the fixed placement block (9) have an installation cavity (10) on their inner sides. The test lead clamping mechanism is installed inside the installation cavity (10). The attenuator test chamber (18) is formed by cutting the attenuator shell along the middle section to form chamber one (1801) and chamber two (1802). Chamber one (1801) and chamber two (1802) are respectively installed on the fixed placement block (9) and the movable placement block (8) through adapters. The centering structure (20) is installed in the attenuator test cavity (18) and is used to center and connect the cavity one (1801) and the cavity two (1802) during testing; The feeding mechanism (19) is installed on the fixed placement block (9) and the movable placement block (8) and is used to feed the attenuation plate after the test is completed when the fixed placement block (9) and the movable placement block (8) are separated.

2. The quick-clamping and positioning fixture for attenuator performance testing according to claim 1, characterized in that: The elbow clamp mechanism includes an elbow clamp wall (5) rotatably mounted on one end of the top of the pad (2), a connecting plate (6) rotatably connected to the middle of the elbow clamp wall (5), a push rod (7) rotatably connected to the end of the connecting plate (6) away from the elbow clamp wall (5), the push rod (7) slidably mounted on the inner side of the pad (2), and the end of the push rod (7) is fixedly connected to the movable placement block (8).

3. The quick-clamping and positioning fixture for attenuator performance testing according to claim 1, characterized in that: The centering structure (20) includes a fixed centering ring (201) and a floating centering ring (202). The fixed centering ring (201) and the floating centering ring (202) are respectively threaded to the outside of the first cavity (1801) and the second cavity (1802). The fixed centering ring (201) has a fixed conical surface (2011) on the inner side of one end near the floating centering ring (202). The floating centering ring (202) has a floating conical surface (2021) on the outer side of one end near the fixed centering ring (201) that is adapted to the fixed conical surface (2011). The floating centering ring (202) has an avoidance groove (2022) on the inner side of one end near the fixed centering ring (201) for avoiding the first cavity (1801) during testing.

4. The quick-clamping and positioning fixture for attenuator performance testing according to claim 1, characterized in that: The test line clamping mechanism includes a clamping block one (11) fixedly installed inside the mounting cavity (10) and a clamping block two (12) slidably installed inside the mounting cavity (10). A push screw (13) is rotatably connected to the clamping block two (12), and the push screw (13) is threadedly connected to the inside of the mounting cavity (10).

5. The quick-clamping and positioning fixture for attenuator performance testing according to claim 1, characterized in that: The feeding mechanism (19) includes a slide rail (1901) fixed to the top and bottom of the fixed placement block (9). A sliding angle plate (1902) is slidably mounted on the slide rail (1901). A first guide rod mounting seat (1923) is fixedly mounted on the fixed placement block (9) at the end of the slide rail (1901) away from the movable placement block (8). First guide rods (1903) are fixed on both sides of the first guide rod mounting seat (1923). The sliding angle plate (1902) is slidably connected to the outside of the first guide rods (1903). A second spring (1904) is sleeved on the outside of the first guide rods (1903). The two ends are respectively connected to the first guide rod mounting base (1923) and the sliding angle plate (1902); a support block (1905) is fixed on the fixed placement block (9) and located on both sides of the slide rail (1901). A second guide rod (1906) is fixed on one end of the support block (1905) near the movable placement block (8). A guide plate (1908) is slidably installed on the outside of the two second guide rods (1906) at the same horizontal position. A third spring (1907) is sleeved on the outside of the second guide rod (1906). The two sides of the third spring (1907) are respectively connected to the support block (1905) and the guide plate (1908).

6. A quick-clamping and positioning fixture for attenuator performance testing according to claim 5, characterized in that: The guide plate (1908) has a vertically opening movable groove (1921) on its inner side. A slide rod (1909) is vertically inserted through the guide plate (1908) and located at the movable groove (1921). The slide rod (1909) is slidably connected to the guide plate (1908). The end of the slide rod (1909) near the attenuator test cavity (18) extends out of the guide plate (1908) and is fixed with an arc-shaped clamping plate (1920). The inner wall of the arc-shaped clamping plate (1920) is set as an arc surface that matches the outer wall of the attenuator. A drive rod (1922) is horizontally arranged on the inner side of the guide plate (1908). The drive rod (1922) is fixed on the corresponding sliding corner plate (1902). The drive rod (1922) passes through the inner side of the slide rod (1909) and is slidably connected to it.

7. A quick-clamping and positioning fixture for attenuator performance testing according to claim 6, characterized in that: The drive rod (1922) includes an inclined drive section (19221) and a straight section (19222). The inclined drive section (19221) is fixedly connected to the corresponding sliding angle plate (1902). The straight section (19222) is located at one end close to the movable placement block (8). The inclined drive section (19221) is inclinedly inserted through the slide rod (1909) and slidably connected to it. The inclined drive section (19221) is slidably installed inside the movable groove (1921).

8. A quick-clamping and positioning fixture for attenuator performance testing according to claim 7, characterized in that: A drive mounting plate (1924) is fixedly installed on the top and bottom of the movable placement block (8) at positions opposite to one end of the straight section (19222). A connecting groove (1927) adapted to the straight section (19222) is provided on the inner side of the drive mounting plate (1924). A snap-fit ​​rod (1925) is slidably installed on the inner top of the drive mounting plate (1924). A fourth spring (1926) is sleeved on the outer side of the snap-fit ​​rod (1925). The two ends of the fourth spring (1926) are respectively connected to the snap-fit ​​rod (1925) and the drive mounting plate (1924). The bottom of the snap-fit ​​rod (1925)... The part extends into the connecting groove (1927), and the straight section (19222) is provided with a slot (19223) that matches the snap-fit ​​rod (1925); in the natural state, under the elastic force of the second spring (1904), the drive rod (1922) drives the two slide rods (1909) and the arc-shaped clamp (1920) to move away from each other, and under the action of the second spring (1904) and the third spring (1907), the guide plate (1908) abuts against the slide rail (1901), at which time the two arc-shaped clamps (1920) are exactly located above and below the attenuation plate to be tested.

9. A quick-clamping and positioning fixture for attenuator performance testing according to claim 8, characterized in that: The slots (19223) on the two straight sections (19222) are laterally staggered, so that when the movable placement block (8) moves away from the fixed placement block (9), the locking rod (1925) cooperates with the slots (19223) to drive the two guide plates (1908) to move at different distances, so that the attenuator clamped by the two arc-shaped clamps (1920) tilts and falls.

10. A quick-clamping and positioning fixture for attenuator performance testing according to claim 1, characterized in that: A spring base (16) is fixed on the top of the base plate (1). A first spring (17) is provided between the spring base (16) and the slider (14). The two ends of the first spring (17) are respectively connected to the spring base (16) and the slider (14). Chamfers (181) are provided on the inner side of the cavity one (1801) and the cavity two (1802) that are close to each other at one end.

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