Support and spray pipe cold swing test device

Abstract

The invention relates to the technical field of spray pipe cold swing tests, in particular to a support and a spray pipe cold swing test device.The support comprises a supporting assembly and a connecting assembly. The supporting assembly is vertically arranged, and the height of the top face is adjustable. One end of the connecting assembly is connected with the top surface of the supporting assembly, and the other end is suitable for being connected with an airtight tool in a spray pipe cold swing test. The body length of the connecting assembly can be adjusted. The height of the top face of the supporting assembly and the height of the connecting assembly are adjusted according to the height of the top face of the airtight tool, and then the position of the displacement sensor in the vertical direction is adjusted. The inclination angle of the displacement sensor is adjusted by adjusting the body length of the connecting assembly. The support is suitable for cold swing tests of spray pipes of various models, the universality of the support is improved, material waste is reduced, and the research and development cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of nozzle cold swing test technology, and in particular to a support and nozzle cold swing test device. Background Technology

[0002] The nozzle is a crucial component of a launch vehicle's propulsion system. Cold-swing tests of the nozzle are essential tests during the propulsion system's development. These tests effectively verify the coordination and adaptability of the nozzle and actuator under cold ground conditions, and also effectively verify the dynamic characteristics of the actuator under pressurized load conditions with the nozzle under cold ground conditions.

[0003] Since nozzles and airtight fixtures often come in various models, and traditional brackets are only suitable for cold swing tests on a specific model of nozzle, traditional brackets have poor versatility. Summary of the Invention

[0004] This invention provides a cold swing test device for a support and nozzle, which solves the problem of poor versatility of traditional supports.

[0005] On one hand, the present invention provides a bracket for use in nozzle cold swing tests, comprising:

[0006] The support components are vertically installed, and the top height is adjustable.

[0007] The connecting component has one end connected to the top surface of the support component, and the other end is suitable for connecting to the airtight fixture in the nozzle cold swing test; the length of the connecting component is adjustable.

[0008] In some embodiments, the support components include:

[0009] Base;

[0010] The lifting rod is mounted on the base and can be moved up and down. Its top is connected to one end of the connecting component.

[0011] In some embodiments, the lifting rod is a threaded rod;

[0012] Supporting components also include:

[0013] An adjusting nut is fixedly installed on the base, forming a threaded hole that matches the threaded rod;

[0014] The lock nut is screwed onto the threaded rod and can abut against the adjusting nut to restrict the rotation of the threaded rod.

[0015] In some embodiments, the base includes:

[0016] Base plate;

[0017] Side plates are mounted on the base plate; adjusting nuts are installed on the side plates.

[0018] In some embodiments, the connection component includes:

[0019] A fixing plate, one end of which is installed on the top surface of the support assembly;

[0020] The movable plate can be slidably installed on the fixed plate along the length of the fixed plate, and the end away from the fixed plate is connected to the airtight tooling.

[0021] In some embodiments, guide holes are provided on the movable plate;

[0022] The connection components also include:

[0023] The locking pin connects the fixed plate and the movable plate through the guide hole and is used to restrict the sliding of the movable plate.

[0024] In some embodiments, the connection component further includes:

[0025] The adapter plate connects to the movable plate and the airtight tooling, respectively.

[0026] In some embodiments, it also includes:

[0027] The displacement sensor has its two ends connected to the top surface of the support assembly and the side wall of the nozzle, respectively, and is used to determine the swing angle of the nozzle based on the displacement detection results.

[0028] On the other hand, the present invention also provides a nozzle cold swing test device, including an airtight tooling, a nozzle and a support provided in any of the above embodiments;

[0029] The nozzle is positioned above the airtight fixture, with its bottom hinged to the interior of the airtight fixture;

[0030] The airtight tooling has a support on at least one side, and one end of the connecting component to the support is connected.

[0031] In some embodiments, it also includes:

[0032] drive;

[0033] The airtight fixture is provided with a driver on at least one side; the driver is hinged to the airtight fixture and the nozzle respectively, and is used to drive the nozzle to swing during the nozzle cold swing test.

[0034] The beneficial effects of this invention are as follows: The bracket of this invention, by setting up a support component and a connecting component, adjusts the height of the top surface of the support component and the height of the connecting component according to the height of the top surface of the airtight fixture, thereby adjusting the position of the displacement sensor in the vertical direction. The tilt angle of the displacement sensor is adjusted by adjusting the length of the connecting component. Therefore, the bracket structure for nozzle cold swing testing of this invention is suitable for cold swing testing of various nozzle models, can adapt to different diameters and heights of engine nozzles and airtight fixtures, improves the versatility of the bracket, reduces material waste, and helps reduce research and development costs. Attached Figure Description

[0035] Figure 1 This is a structural schematic diagram of some specific embodiments of a bracket according to the present invention;

[0036] Figure 2 yes Figure 1 The exploded view of the support shown;

[0037] Figure 3 This is a schematic diagram of the structure of some specific embodiments of the nozzle cold swing test device of the present invention.

[0038] In the attached diagram, 110 is the support assembly; 111 is the base; 1111 is the bottom plate; 1112 is the side plate; 11121 is the reinforcing rib; 1113 is the connecting plate; 112 is the lifting rod; 1121 is the connecting plate; 113 is the adjusting nut; 114 is the locking nut; 120 is the connecting assembly; 121 is the fixing plate; 122 is the movable plate; 1221 is the guide hole; 123 is the locking pin; 124 is the adapter plate; 130 is the displacement sensor; 200 is the airtight fixture; 210 is the flange; 300 is the nozzle; 410 is the first hinge seat; and 420 is the second hinge seat. Detailed Implementation

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that the nozzle is a crucial component of the launch vehicle's propulsion system. The direction of the propellant combustion gases is altered by oscillating the nozzle. The cold oscillation test of the nozzle is a necessary test for propulsion systems with nozzle oscillation capabilities, designed to assess the accuracy of the nozzle's oscillation angle and its operational reliability. The airtight fixture is a cold-pressurization device. A displacement sensor converts linear mechanical displacement signals into electrical signals to measure displacement.

[0041] As described in the background section, conducting nozzle cold swing tests can effectively verify the coordination and adaptability of the nozzle and actuator under cold ground conditions, and effectively verify the dynamic characteristics of the actuator under cold ground pressurization load conditions. Since nozzles and airtight fixtures often come in various models, and traditional supports are only suitable for cold swing tests on a specific nozzle model, traditional supports have poor versatility, easily leading to waste and high R&D costs. Furthermore, they result in lengthy preparation time for nozzle cold swing tests, severely impacting the development schedule.

[0042] To solve the above problems, refer to Figure 1 , Figure 2 and Figure 3 On one hand, the present invention provides a bracket for use in nozzle cold swing tests, including a support assembly 110 and a connecting assembly 120. The support assembly 110 is vertically arranged, and its top surface height is adjustable. One end of the connecting assembly 120 is connected to the top surface of the support assembly 110, and the other end is suitable for connection to an airtight fixture 200. The length of the connecting assembly 120 is adjustable.

[0043] In this embodiment, the support assembly 110 supports the connecting assembly 120 and the displacement sensor 130. The height of the top surface of the support assembly 110 and the height of the connecting assembly 120 are adjusted according to the height of the top surface of the airtight fixture 200, thereby adjusting the vertical position of the displacement sensor 130. The tilt angle of the displacement sensor 130 is adjusted by adjusting the length of the connecting assembly 120. Therefore, the bracket for nozzle cold swing testing in this invention is suitable for cold swing testing of various types of nozzles 300, adapting to different diameters and heights of nozzles 300 and airtight fixtures 200, improving the bracket's versatility, reducing material waste, and helping to lower R&D costs. Simultaneously, it reduces the preparation time for cold swing testing and accelerates the development process.

[0044] Specifically, in the exemplary embodiment, the support assembly 110 includes a base 111 and a lifting rod 112. The lifting rod 112 is movably mounted on the base 111, and its top is connected to one end of the connecting assembly 120. The vertically moving lifting rod 112 can drive the connecting assembly 120 to move vertically, thereby adjusting the height of the connecting assembly 120.

[0045] Preferably, a connecting plate 1121 is provided at the top end of the lifting rod 112, and the connecting plate 1121 is connected to one end of the connecting assembly 120. The connecting plate 1121 increases the contact area when the lifting rod 112 is connected to the connecting assembly 120, thereby improving the stability of the connection.

[0046] Preferably, the connecting plate 1121 is detachably connected to one end of the connecting assembly 120 to facilitate the assembly and disassembly of the lifting rod 112 and the connecting assembly 120. Specifically, the detachable connection can be achieved by means of screws or snap-fits.

[0047] In some specific embodiments, the lifting rod 112 is a threaded rod. The support assembly 110 includes a base 111, a lifting rod 112, an adjusting nut 113, and a locking nut 114. The adjusting nut 113 is fixedly installed on the top of the base 111. A threaded hole adapted to the threaded rod is formed in the middle of the adjusting nut 113. When the threaded rod rotates, it can move up and down with higher accuracy. The locking nut 114 is screwed onto the threaded rod and can abut against the adjusting nut 113 to restrict the rotation of the threaded rod.

[0048] Preferably, there can be one locking nut 114, resulting in lower manufacturing costs. Alternatively, there can be two locking nuts 114, one located above the adjusting nut 113 and abutting against its top surface, and the other located below it and abutting against its bottom surface. The two locking nuts 114 working together significantly improve the stability of the lifting rod 112.

[0049] Specifically, in the example, such as Figure 1 and Figure 2 As shown, the base 111 includes a base plate 1111 and a side plate 1112. The bottom end of the side plate 1112 is mounted on the top surface of the base plate 1111. An adjusting nut 113 is mounted on the top of the side plate 1112.

[0050] Preferably, the base 111 further includes a connecting plate 1113. The bottom end of the side plate 1112 abuts against the top surface of the base 111. The connecting plate 1113 is connected to the base plate 1111 and the side plate 1112 respectively, which greatly improves the rigidity and strength of the connection.

[0051] Preferably, the connecting plate 1113 is detachably connected to the base plate 1111 and the side plate 1112 respectively, so as to facilitate the assembly, use and disassembly maintenance of the base 111. Specifically, it can be connected by screws or snap-fit.

[0052] Preferably, the base plate 1111 has mounting holes, through which bolts or pins can be used to detachably mount the base plate 1111 to the ground or the base 111.

[0053] Preferably, there is one base plate 1111. The side plate 1112 and connecting plate 1113 can be a single unit, resulting in lower manufacturing costs. Alternatively, there can be two side plates 1112 and connecting plate 1113, with one side of each side plate 1112 facing each other. The tops of the two side plates 1112 are detachably connected to opposite sides of the adjusting nut 113. The lifting rod 112 is installed between the two side plates 1112 via the adjusting nut 113. One connecting plate 1113 is detachably connected to the bottom of the base plate 1111 and one of the side plates 1112. The other connecting plate 1113 is detachably connected to the bottom of the base plate 1111 and the bottom of the other side plate 1112. The overall structure exhibits strong stability.

[0054] Preferably, at least one side surface of each side plate 1112 is provided with a reinforcing rib 11121 to improve the rigidity and strength of the side plate 1112.

[0055] Specifically, in the example, such as Figure 1 and Figure 2 As shown, the connecting assembly 120 includes a fixed plate 121, a movable plate 122, and an adapter plate 124. One end of the fixed plate 121 is detachably mounted on the top surface of the connecting plate 1121 of the lifting rod 112. The movable plate 122 is slidably mounted on the fixed plate 121 along its length, and its end away from the fixed plate 121 is connected to the airtight fixture 200 via the adapter plate 124. The adapter plate 124 adopts a modular design, and different adapter plates 124 can be replaced according to different models of nozzles 300 and airtight fixtures 200. Adjusting the distance between the bottom end of the lifting rod 112 and the base plate 1111 allows for the adaptation to airtight fixtures 200 of different heights. By using minimal parts replacement, it can be adapted to different models of nozzles 300 and airtight fixtures 200, effectively improving the efficiency of nozzle cold swing tests and reducing R&D costs.

[0056] Preferably, the adapter plate 124 is detachably connected to the movable plate 122 and the airtight tooling 200. This facilitates assembly, use, disassembly, and maintenance.

[0057] In some embodiments, guide holes 1221 are provided on one side, the middle, or opposite sides of the movable plate 122. The extending direction of the guide holes 1221 is consistent with the length direction of the movable plate 122. The connecting assembly 120 also includes a locking pin 123. The locking pin 123 connects the fixed plate 121 and the movable plate 122 through the guide holes 1221, and is used to restrict the sliding of the movable plate 122. When the locking pin 123 loosens, the movable plate 122 can move relative to the fixed plate 121, so that the length of the connecting assembly 120 can be adjusted.

[0058] In other embodiments, guide holes 1221 are provided on one side, in the middle, or on opposite sides of the movable plate 122. The extending direction of the guide holes 1221 is consistent with the length direction of the movable plate 122. The connecting assembly 120 also includes a locking pin 123, a lead screw, and a nut. The locking pin 123 connects the fixed plate 121 and the movable plate 122 through the guide holes 1221, and is used to limit the sliding of the movable plate 122. The lead screw is rotatably mounted on the bottom surface of the movable plate 122, and its axis is in the same direction as the length of the movable plate 122. The nut is screwed to the end of the lead screw away from the movable plate 122. An adapter plate 124 is fixed on the nut. When the locking pin 123 loosens, the movable plate 122 can move relative to the fixed plate 121 to initially and roughly adjust the length of the connecting assembly 120. When the lead screw rotates, the adapter plate 124 can move relative to the movable plate 122 to further fine-tune the length of the connecting assembly 120.

[0059] In some embodiments, the movable plate 122 and the fixed plate 121 are slidably connected by a combination of slide rails and slide grooves. Of course, other sliding connection methods can also be used.

[0060] Specifically, in the example, the support also includes a displacement sensor 130. The two ends of the displacement sensor 130 are respectively connected to the top surface of the connecting plate 1121 of the lifting rod 112 of the support assembly 110 and the side wall of the nozzle 300, and are used to detect the swing angle of the nozzle 300.

[0061] Preferably, the displacement sensor 130 can be a contact displacement sensor; however, a non-contact displacement sensor can also be used. If a non-contact displacement sensor is used, there are no connection points, avoiding the resistance that connection points may cause to the oscillation of the nozzle 300, thus making the test results more accurate.

[0062] Preferably, one end of the displacement sensor 130 is connected to the top surface of the connecting plate 1121 of the lifting rod 112 of the support assembly 110 via a first hinge seat 410, and the other end is connected to the side wall of the nozzle 300 via a second hinge seat 420. Before conducting the nozzle cold swing test, the vertical position and tilt angle of the displacement sensor 130 are adjusted so that the axis of the displacement sensor 130 is perpendicular to the generatrix of the frustum-shaped nozzle 300, thereby ensuring the optimal linear relationship between the swing angle of the nozzle 300 and the displacement sensor 130.

[0063] Preferably, the top surface of the connecting plate 1121 of the first hinge seat 410 and the lifting rod 112 is connected by a detachable method such as screwing or snap-fitting. The second hinge seat 420 is connected to the side wall of the nozzle 300 by a detachable method such as screwing or snap-fitting. This facilitates assembly and disassembly.

[0064] Preferably, one end of the displacement sensor 130 can be rotatably connected to the first hinge seat 410 via a rotating shaft and a bushing. Of course, one end of the displacement sensor 130 can also be rotatably connected to the first hinge seat 410 via a universal joint, further reducing the resistance encountered when rotating at the connection point, reducing the interference of the resistance at the connection point on the oscillation of the nozzle 300, and further improving the accuracy of the test.

[0065] On the other hand, such as Figure 3 As shown, the present invention also provides a nozzle cold swing test device, including an airtight fixture 200, a nozzle 300, a support, and a driver. The nozzle 300 is disposed above the airtight fixture 200, and its bottom is hinged to the interior of the airtight fixture 200 via a universal structure. A support is provided on at least one side of the airtight fixture 200. One end of the connecting assembly 120 between the airtight fixture 200 and the support is connected. A driver is provided on at least one side of the airtight fixture 200. Both ends of the driver are respectively hinged to the top of the airtight fixture 200 and the side wall of the nozzle 300, for driving the nozzle 300 to swing during the nozzle cold swing test.

[0066] The working process and principle of the nozzle cold swing test device are as follows:

[0067] First, adjust the height of the top surface of the support assembly 110, the height of the connecting assembly 120, and the vertical position of the displacement sensor 130 according to the height of the top surface of the airtight fixture 200. Then, connect the end of the connecting assembly 120 away from the support assembly 110 to the airtight fixture 200. Next, mount one end of the displacement sensor 130 to the top surface of the support assembly 110 via the first hinge seat 410, and mount the other end of the displacement sensor 130 to the side wall of the nozzle 300 via the second hinge seat 420. Afterward, adjust the length of the connecting assembly 120 to adjust the tilt angle of the displacement sensor 130. Before conducting the nozzle cold swing test, ensure that the axis of the displacement sensor 130 is perpendicular to the generatrix of the frustum-shaped nozzle 300 to ensure optimal linearity between the swing angle of the nozzle 300 and the displacement sensor 130. Then, the actuator drives the nozzle 300 to swing, and the displacement sensor 130 collects the swing angle of the nozzle 300. It should be noted that a regulated DC power supply is used to power the displacement sensor 130. The displacement sensor 130 converts the collected voltage data into displacement data through an AD acquisition card, and obtains the swing angle value of the nozzle 300 based on the linear fitting relationship between the swing angle of the nozzle 300 and the displacement of the displacement sensor 130. Overall, it is applicable to cold swing tests of various nozzle 300 models, improving the versatility of the support, reducing material waste, and helping to reduce R&D costs. At the same time, it shortens the preparation time for the cold swing test, which helps to improve the development schedule. Moreover, because the support component 110 is located far from the airtight fixture 200, it can provide greater rigidity support, effectively suppressing the vertical movement of the connecting component 120 during the cold swing test, ensuring the accuracy of the data collected by the displacement sensor 130, and improving the test precision.

[0068] In some embodiments, the bracket and the actuator are a single unit, with the displacement sensor 130 of the bracket and the actuator located on opposite sides of the nozzle 300. This allows for the testing of the sway angle values ​​in both forward / backward and left / right directions.

[0069] In some other embodiments, there are two supports and two actuators. The displacement sensors 130 of the two supports are located on adjacent sides of the nozzle 300. The two actuators are located on other adjacent sides of the nozzle 300. For example, one actuator is located on the left side of the nozzle 300, and one displacement sensor 130 is located on the right side of the nozzle 300. Another actuator is located on the rear side of the nozzle 300, and another actuator is located on the front side of the nozzle 300. In this way, the sway angle values ​​in four directions (front, back, left, and right) can be measured.

[0070] Preferably, the top of the airtight tooling 200 is provided with a flange 210, which is detachably connected to the adapter plate 124 of the connecting assembly 120.

[0071] Preferably, the actuator is a linear actuator such as an electric cylinder, pneumatic cylinder, or hydraulic cylinder. Compared to using a pneumatic or hydraulic cylinder, an electric cylinder does not require hydraulic oil or gas as a medium, its performance is less affected by the external environment, and it does not require complex pumps and valves like a hydraulic system, offering advantages such as simple structure, high precision, fast response, and high stability. Of course, the actuator can also be a rotary actuator such as a servo motor or stepper motor. If a rotary actuator is used, the fixed end of the rotary actuator is mounted on the airtight fixture 200, and the movable end is connected to the side wall of the nozzle 300 via a rotary linear mechanism.

[0072] Specifically, in the exemplary example, the nozzle cold swing test apparatus also includes a slide rail. The slide rail is annular and is arranged along the outer periphery of the airtight fixture 200. The base plate 1111 of the support assembly 110 is slidably mounted on the slide rail. In this way, the two support assemblies 110 can be arranged at an angle of 0°-180°, thereby allowing the two connecting assemblies 120 and the two displacement sensors 130 to be arranged at an angle of 0°-180° to meet different cold swing test requirements.

[0073] In some possible embodiments, the engine nozzle cold sway test can be carried out using the nozzle cold sway test device described in this application as follows:

[0074] Fix the airtight fixture 200 on the ground, fix the engine nozzle 300 on the airtight fixture 200, and connect the driver to the engine nozzle 400 and the airtight fixture 500 respectively, with the two drivers arranged at 90°.

[0075] The height of the support of the cold swing test fixture is adjusted according to the height of the airtight fixture 200, and connected to the airtight fixture 200 through the airtight fixture adapter plate 124. There are two sets of supports for the cold swing test fixture, which are arranged at 90° around the engine nozzle.

[0076] Adjust the length of the connecting assembly 120 and connect the linear displacement sensor 130 to the first hinge seat 410 of the sensor and the lug on the engine nozzle 300 respectively, so that the line connecting the linear displacement sensor 130 and the pivot of the engine nozzle is perpendicular to the line connecting the lug on the engine nozzle 300, ensuring the linearity of the measurement by the linear displacement sensor 130.

[0077] The servo mechanism drives the engine nozzle 300 to swing in two directions according to the control signal. Two linear displacement sensors 130 sense and collect the displacement changes. The controller obtains the displacement and calculates the actual swing angle of the engine nozzle, and adjusts the control signal of the servo mechanism to form a closed loop.

[0078] Finally, the oscillation performance of the engine nozzle was analyzed based on the data from the test process.

[0079] The nozzle cold swing test bracket in this application, through its horizontal and height adjustable structural design, can adapt to different engine nozzles and airtight fixtures with different diameters and heights, achieving minimal structural modifications, thereby adapting to different engine nozzles and airtight fixtures, and can also adapt to different mounting interfaces of measuring swing angle sensors.

[0080] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0082] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0083] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A support for use in nozzle cold swing tests, characterized in that, include: The support components are vertically installed, and the top height is adjustable. The connecting component has one end connected to the top surface of the support component and the other end adapted to connect to the airtight fixture in the nozzle cold swing test; the length of the connecting component is adjustable.

2. The bracket according to claim 1, characterized in that, The support components include: base; The lifting rod is mounted on the base and can be moved up and down, with its top connected to one end of the connecting assembly.

3. The bracket according to claim 2, characterized in that, The lifting rod is a threaded rod; The support components also include: An adjusting nut is fixedly installed on the base and has a threaded hole that matches the threaded rod; A lock nut, screwed onto the threaded rod, can abut against the adjusting nut to restrict the rotation of the threaded rod.

4. The stent according to claim 3, characterized in that, The base includes: Base plate; A side plate is mounted on the base plate; the adjusting nut is mounted on the side plate.

5. The stent according to any one of claims 1 to 4, characterized in that, The connection component includes: A fixing plate, one end of which is installed on the top surface of the support assembly; The movable plate is slidably mounted on the fixed plate along the length of the fixed plate, and the end away from the fixed plate is connected to the airtight tooling.

6. The bracket according to claim 5, characterized in that, The movable plate is provided with guide holes; The connection component also includes: A locking pin connects the fixed plate and the movable plate through the guide hole, and is used to restrict the sliding of the movable plate.

7. The bracket according to claim 5, characterized in that, The connection component also includes: The adapter plate is connected to the movable plate and the airtight tooling, respectively.

8. The stent according to any one of claims 1 to 4, characterized in that, Also includes: A displacement sensor, with its two ends connected to the top surface of the support assembly and the side wall of the nozzle respectively, is used to determine the swing angle of the nozzle based on the displacement detection results.

9. A nozzle cold swing test device, characterized in that, Includes airtight tooling, nozzle, and the bracket as described in any one of claims 1 to 8; The nozzle is positioned above the airtight fixture, and its bottom is hinged to the interior of the airtight fixture. The airtight fixture has a support on at least one side, which is connected to one end of the connecting component of the support.

10. The nozzle cold swing test device according to claim 9, characterized in that, Also includes: drive; The actuator is provided on at least one side of the airtight fixture; the actuator is hinged to the airtight fixture and the nozzle respectively, and is used to drive the nozzle to swing during the nozzle cold swing test.

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