A thrust device air tightness automatic detection equipment

Abstract

The application provides a kind of thrust device air-tightness automatic detection equipment, including at least a set of air-tightness tool assembly and helium mass spectrometer;Air-tightness tool assembly is used to position, throat plugging, electromagnetic valve energization after plugging completion, thrust device inflation, pressure maintaining, and the gas around thrust device is extracted and supplied to helium mass spectrometer;Helium mass spectrometer is arranged in air-tightness platform assembly, and according to the gas supplied by air-tightness tool assembly, the helium leakage amount in thrust device air-tightness detection is accurately measured.The automatic detection equipment of the application can automatically and accurately detect the air-tightness sealing condition of the electromagnetic valve and the thrust chamber assembly joint surface in the thrust device, and the detection result is accurate and reliable.

Description

Technical Field

[0001] This invention belongs to the field of product sealing test technology, and specifically relates to an automatic testing device for the airtightness of a thrust device. Background Technology

[0002] As a crucial component of attitude and orbit control engines, the thrust unit is primarily used for velocity correction, orbital correction, and attitude control in various spacecraft, making it an indispensable power source for spacecraft. Therefore, the reliability of the thrust unit is critical to the success or failure of a spacecraft mission, and the assembly sealing of the thrust unit is a significant factor affecting its assembly reliability.

[0003] Currently, the sealing performance of thrust units is mainly checked using the positive pressure "soap bubble method." This involves installing a sealing fixture at the nozzle throat, then injecting a pressurized gas medium into the thrust chamber throat, applying soap bubbles between the thrust chamber and the solenoid valve mounting surface, maintaining pressure for a period of time, and manually recording the number of soap bubbles to determine if the thrust unit's sealing performance is up to standard. This testing method is highly susceptible to the skill level of the operators and the uniformity of soap bubble application, making it difficult to quantify precisely, resulting in poor accuracy and low efficiency, and failing to meet high quality requirements. Therefore, improving the quality, efficiency, and reliability of thrust unit sealing performance testing is an urgent problem to be solved. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the inventors have conducted intensive research and provided an automatic thrust device airtightness detection device, which realizes the clamping, throat sealing, and gas filling of the thrust device, as well as the helium mass spectrometry leak detection. After the detection is completed, the device automatically releases gas. The entire detection process is highly automated and the detection results are accurate.

[0005] The technical solution provided by this invention is as follows:

[0006] An automatic thrust device airtightness testing device includes: at least one set of airtight tooling components and a helium mass spectrometer;

[0007] The airtight tooling assembly is used to position the thrust device, seal the throat, energize the solenoid valve after sealing, inflate and maintain the pressure of the thrust device, and draw in the gas around the thrust device to supply the helium mass spectrometer.

[0008] The helium mass spectrometer, installed inside the gas-tight stage assembly, accurately measures the amount of helium leaking during the gas tightness test of the thrust device, based on the gas supplied by the gas-tight tooling assembly.

[0009] Furthermore, the automatic testing equipment also includes an airtight stage assembly, which supports the airtight tooling assembly and the helium mass spectrometer, controls the airtight tooling assembly to operate in sequence, and starts and stops the automatic airtightness testing.

[0010] The automatic thrust device airtightness detection device provided by the present invention has the following beneficial effects:

[0011] (1) The present invention provides an automatic thrust device airtightness detection device. The airtightness tooling assembly includes a thrust device positioning tool, an inflation tool, a throat sealing tool, a solenoid valve energizing mechanism, a helium mass spectrometer detection motion mechanism, and a mounting base. It can complete the positioning of the thrust device, throat sealing, and after sealing, the solenoid valve is energized, the thrust device is inflated and pressure is maintained. After pressure is maintained, the helium mass spectrometer detection motion mechanism drives the suction gun to detect helium leakage at the sealing part of the thrust device.

[0012] (2) The present invention provides an automatic detection device for the air tightness of a thrust device, wherein a floating mechanism is provided in the throat sealing fixture so that the sealing head can adapt to the problem of poor consistency of throat position in different batches of products.

[0013] (3) The automatic testing equipment for the air tightness of the thrust device provided by the present invention has a hollow structure in the throat sealing tool and uses a pipe joint to connect to the air circuit system. The exhaust is controlled by a solenoid valve to minimize the residual helium in the chamber after the test.

[0014] (4) The present invention provides an automatic detection device for the air tightness of a thrust device. In the solenoid valve energizing fixture, four sets of spring contact pins are connected to the solenoid valve pins, and a switch probe is set to detect whether the spring contact pins have moved into place.

[0015] (5) The present invention provides an automatic testing device for the air tightness of a thrust device. The air tightness test bench is equipped with an armored chamber with automatic exhaust function. After a set of thrust device air tightness tests is completed, the exhaust fan works to discharge the residual helium in the chamber, so as to avoid affecting the test results of the next set of products.

[0016] (6) The present invention provides an automatic testing device for the airtightness of a thrust device, which is equipped with multiple sets of airtight tooling components, enabling parallel operation and improving testing efficiency;

[0017] (7) The present invention provides an automatic thrust device air tightness detection device, which uses a helium mass spectrometer and a helium mass spectrometer detection motion mechanism to detect the air tightness of the thrust device, and controls the start and stop of the helium leakage detection of the thrust device by setting a pneumatic valve on the hose connecting the suction gun to the helium mass spectrometer. Attached Figure Description

[0018] Figure 1 This is a perspective view of the automatic airtightness detection device for the thrust device of the present invention;

[0019] Figure 2 This is a front view of the automatic airtightness detection device for the thrust device of the present invention;

[0020] Figure 3 This is a schematic diagram of the components of the airtightness test bench;

[0021] Figure 4 This is a schematic diagram of an airtight tooling component;

[0022] Figure 5 Structural diagram of the positioning fixture for the thrust device;

[0023] Figure 6 Structural diagram of the positioning fixture for the thrust device;

[0024] Figure 7 This is a structural diagram of an inflatable tooling.

[0025] Figure 8 This is a structural diagram of the solenoid valve's energizing mechanism;

[0026] Figure 9 This is a structural diagram of the motion mechanism for helium mass spectrometry detection. Detailed Implementation

[0027] The features and advantages of the present invention will become clearer and more apparent from the following detailed description.

[0028] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0029] This invention provides an automatic testing device for the airtightness of a thrust device, including an airtight stage assembly 1, at least one or two sets of airtight tooling assemblies 2, and a helium mass spectrometer 3;

[0030] The airtight stage assembly 1 is used to support the airtight tooling assembly 2 and the helium mass spectrometer 3, and to control the airtight tooling assembly 2 to operate in sequence and start and stop the automatic airtightness detection.

[0031] The airtight tooling assembly 2 is used to position the thrust device, seal the throat, energize the solenoid valve after sealing, inflate and maintain the pressure of the thrust device, and draw in the gas around the thrust device to supply the helium mass spectrometer 3.

[0032] The helium mass spectrometer 3 is installed inside the airtight stage assembly 1 and accurately measures the amount of helium leaking during the airtightness detection of the thrust device 4 based on the gas supplied by the airtight tooling assembly 2.

[0033] like Figures 1-3As shown, the airtight test bench assembly 1 includes an airtight test bench 11, at least one set of armored chambers 12 (such as two sets), an exhaust fan 13, two sets of movable observation windows 14, and two sets of rodless cylinders 15, all mounted on the airtight test bench 11. The airtight test bench 11 includes a test bench cabinet, an airtight piping system, and a control system. The test bench cabinet is used to house other components of the device. The airtight piping system provides a gas source and gas supply pipeline for the inflation and pressure holding processes of the thrust device for airtightness testing, and provides an exhaust pipeline for the exhaust of the thrust device after the test. The control system is used to control the throat sealing, inflation, pressure holding, and helium mass spectrometry sampling of the thrust device, such as controlling parameters like inflation gas pressure, rate, and nitrogen-helium mixing ratio, and the two inflation paths can be controlled independently.

[0034] The armored chamber 12 is made of steel structure or welded steel plate and can withstand an impact force of not less than 5 MPa to avoid injury to personnel caused by high pressure gas impact during operation. Operating ports are machined on its front and rear sides respectively.

[0035] The exhaust fan 13 is installed on the top plate of the armored chamber 12 to exhaust the residual helium gas after product testing outside the armored chamber 12, so as to avoid affecting subsequent measurements.

[0036] The movable observation window 14 is located on the front and rear sides of the armored chamber 12. Its outer perimeter is made of sheet metal frame structure and the middle is equipped with explosion-proof glass, so that personnel can observe the activities inside the armored chamber 12 through the movable observation window 14.

[0037] The rodless cylinder 15 is installed on the upper and lower sides of the front and rear operating ports of the armored chamber 12, and is connected to the front and rear sets of movable observation windows 14 through the adapter block, respectively. It is used to drive the two sets of movable observation windows 14 to block or move away from the operating ports of the armored chamber 12, or to drive the front and rear sets of movable observation windows 14 to switch between the armored chambers 12 when there are multiple armored chambers 12. The rodless cylinder 15 is equipped with a control button and can be automatically or manually controlled by the control system.

[0038] like Figures 1-2 and Figures 4-5 As shown, the airtight tooling assembly 2 is installed inside the armored chamber 12. Multiple sets of airtight tooling assemblies 2 can be adapted to multiple sets of thrust devices. Multiple sets of airtight tooling assemblies 2 work alternately, shortening product installation time and improving testing efficiency.

[0039] The airtight tooling assembly 2 includes a thrust device positioning tooling 21, an inflation tooling 22, a throat sealing tooling 23, a solenoid valve energizing mechanism 24, a helium mass spectrometer detection motion mechanism 25, and a mounting base 26.

[0040] The positioning fixture 21 is used to accurately position the thrust device;

[0041] Inflatable fixture 22 is used for inflating and docking the thrust device;

[0042] Throat sealing fixture 23 is used to seal the throat of the thrust device nozzle;

[0043] The solenoid valve energizing mechanism 24 is used to energize the solenoid valve of the thrust device.

[0044] The helium mass spectrometry detection motion mechanism 25 is used to carry the suction gun to sample the gas around the thrust device and assist in helium mass spectrometry detection.

[0045] Mounting base 26 is used to support the fixed positioning fixture 21, the inflation fixture 22, the throat sealing fixture 23, the solenoid valve energizing mechanism 24, and the helium mass spectrometry detection motion mechanism 25, and is fixed in the armored chamber 12 as an adapter.

[0046] like Figures 4-5 As shown, the thrust device positioning fixture 21 is set at the center of the mounting base 26, and the other fixtures are arranged on the circumference of the mounting base 26 according to their positional relationship. Each fixture is precisely positioned and fixed on the mounting base 26 by positioning pins to ensure the positional relationship between each fixture and the thrust device 4.

[0047] The thrust device positioning fixture 21 includes a positioning fixture mounting base 211, multiple sets (e.g., three sets) of positioning support columns 212, and a throat auxiliary support 213. The positioning fixture mounting base 211 is fixed at the center of the mounting base 26. The multiple sets of positioning support columns 212 and the throat auxiliary support 213 are fixed on the positioning fixture mounting base 211. The multiple sets of positioning support columns 212 are connected to the flange on the shell of the thrust device 4 to support and fix the thrust device. The throat auxiliary support 213 supports the throat of the thrust device 4 and is used to provide auxiliary support for the thrust device 4 to prevent excessive horizontal force from damaging the mounting plate of the thrust chamber 42 during the throat sealing process.

[0048] Preferably, the upper end of the multiple sets of positioning support columns 212 is processed into a tapered structure, and a transition straight section is processed between the tapered structure and the diameter of the support column body. The diameter of the tapered structure and the transition straight section is smaller than the diameter of the positioning support column body. A support platform is formed at the connection between the transition straight section and the positioning support column body. After the tapered structure guides the threaded hole on the flange, the flange rests on the support platform.

[0049] The product targeted by this invention is a thrust device 4, which includes a solenoid valve 41 and a thrust chamber 42. Based on different assembly angles (0°, +120°, -120°) between the cable connector on the solenoid valve 41 and the thrust chamber 42, three postures of the thrust device 4 are formed. To achieve compatibility with the three postures of the thrust device 4, three sets of evenly distributed throat auxiliary supports 213 are preferably provided. Their installation positions correspond to the thrust chamber nozzle orientation of the three postures of the thrust device 4. After being positioned by the thrust device positioning fixture 21, the solenoid valve 41 of the thrust device 4 can always face the same direction (its cable connector always faces the solenoid valve energizing mechanism 24), facilitating the subsequent positioning, docking, and energizing of the solenoid valve energizing mechanism 24.

[0050] like Figure 4 and Figure 6 As shown, the inflation fixture 22 includes an inflation fixture base 221, a rotary clamping cylinder 222, a balancing cylinder 223, a pressure arm 224, a fixture inflation nozzle 225, an inflation sealing ring 226, a pipe connector 227, and a buffer pad 228. The bottom of the inflation fixture base 221 is fixed on the mounting base 26, and the rotary clamping cylinder 222 and the balancing cylinder 223 are arranged side by side on its upper end. The rotary clamping cylinder 222 has a rotary pressing function, which can drive the pressure arm 224 to swing 90° and press down to connect with the inflation nozzle of the solenoid valve 41. At the same time, it allows the inflation fixture 22 to be moved out of the upper space of the thrust device 4 when not in operation, which is convenient for manual or automated feeding. The pressure arm 224 is set as a T-shaped structure, with a balancing buffer pin fixed at one end and a fixture inflation nozzle 225 set at the other end. The end of the fixture inflation nozzle 225 is set as a cone, and its taper is the same as the taper of the inflation nozzle of the solenoid valve 41. Furthermore, an inflation sealing ring 226 is provided at the end of the inflation nozzle 225 of the tooling, which seals the inflation nozzle during inflation; the upper end of the inflation nozzle 225 is connected to a pipe joint 227, which is connected to the airtight pipeline system of the airtight test bench 11 through a high-pressure hose to facilitate the rotation and clamping of the inflation tooling; a buffer pad 228 is provided on the balance cylinder 223 to buffer the balance buffer pin and provide a reaction balance force to the pressure arm 224, so as to prevent the rotary clamping cylinder 222 from bearing excessive bending moment during operation, and so that the resultant force on the rotary clamping cylinder 222 acts in the direction of its piston rod axis.

[0051] like Figure 4 and Figure 7 As shown, the throat sealing fixture 23 is used to seal the throat of the thrust chamber 42, forming a sealed space between the solenoid valve 41 and the thrust chamber 42, so as to maintain pressure on the thrust device 4 and prevent gas leakage from the throat. According to the three postures of the thrust device 4, three sets of corresponding throat sealing fixtures 23 are evenly distributed on the mounting base 26, with the installation positions corresponding to the orientation of the thrust chamber nozzle of the thrust device 4 in the three postures.

[0052] The throat plugging fixture 23 includes a plugging fixture base 231, a plugging cylinder 232, a floating groove seat 233, a floating plugging rod 234, an elastic plunger 235, a vent pipe connector 236, a hollow plug 237, and a plugging sealing ring 238. The bottom of the plugging fixture base 231 is fixed to the mounting base 26, and the upper end face of the base is provided with the plugging cylinder 232. The plugging cylinder 232 is a double cylinder. The floating groove seat 233 is disposed on the piston seat of the plugging cylinder 232. One end of the floating groove seat 233 has a circular floating groove, and four sets of elastic plungers 235 are evenly distributed around its perimeter. The floating plugging rod 234... The end is set in the floating groove 233 and contacts the elastic head of the elastic plunger 235. Under the action of external force, the floating sealing rod 234 can float in the floating groove 233 with a floating amount ≤ ±2mm. The hollow plug 237 is fixed to the other end of the floating sealing rod 234 by a threaded connection, and a sealing ring 238 is provided between the two. The end of the floating sealing rod 234 near the workpiece is a hollow structure and is connected to the exhaust pipe of the airtightness test bench 11 through the vent pipe joint 236. The exhaust pipe is equipped with a solenoid valve, which is disconnected during the inflation and pressure holding process and opened during the exhaust process.

[0053] When selecting the sealing cylinder 232, the sealing force is made slightly greater than the reaction force of the inner cavity of the thrust device 4 on the floating sealing rod 234 when it is pressurized. During operation, the floating sealing rod 234 can adaptively float according to the change in the position of the throat of the thrust chamber 42, so that the sealing ring 238 is in close contact with the inner wall of the throat of the thrust chamber, thereby achieving effective sealing of the throat of the thrust device 4. The plug 237 is made of non-metallic material such as nylon to avoid scratching the inner wall of the throat of the thrust chamber 42. After the airtight pressure holding and testing are completed, the airtightness test bench 11 fills the thrust device 4 with nitrogen, and the residual nitrogen and helium mixture in the pipeline and the inner cavity of the thrust device 4 is discharged to the outside through the hollow structure of the floating sealing rod 234 and the exhaust pipe connected to the vent pipe joint 236.

[0054] like Figure 4 and Figure 8 As shown, the solenoid valve energizing mechanism 24 is used to connect with the cable connector of the solenoid valve 41 and apply DC voltage to the solenoid valve to control the solenoid valve 41 to open, so that the inflation fixture 22 can fill the inner cavity of the thrust device with gas through the solenoid valve for pressure maintenance.

[0055] The solenoid valve energizing mechanism 24 includes a support base 241, a double cylinder 242, a pin holder 243, four sets of spring pins 244, and a switch probe 245. The support base 241 is mounted on a mounting base 26 across a throat sealing fixture 23, and the double cylinder 242 is mounted on its upper surface. The pin holder 243 is mounted on the piston seat of the double cylinder 242. The four sets of spring pins 244 are fixed to the pin holder 243 in a sequence corresponding to the pins of the solenoid valve 41. Preferably, the ends of the spring pins 244 are... The part is conical in shape. After contacting the pin of the solenoid valve 41, it can be tightly connected with the pin of the solenoid valve 41 under the action of spring force to avoid loose connection. A switch probe 245 is provided below the spring contact pin 244. When working, the double cylinder 242 extends, so that after the spring contact pin 244 is connected with the pin of the solenoid valve 41, the end of the switch probe 245 presses against the solenoid valve 41 and is compressed, triggering a contact signal and feeding it back to the control system. After the double cylinder 242 receives the stop signal, it stops driving the forward spring contact pin 244 forward.

[0056] like Figure 4 and Figure 9 As shown, the helium mass spectrometry detection motion mechanism 25 includes a motion mechanism base 251, a Z-axis moving cylinder 252, a first electric displacement platform 253, a first adapter plate 254, a servo motor 255, a balance block 256, an adapter block 257, a second electric displacement platform 258, a second adapter plate 259, a suction gun 2510, a suction gun adjustment seat 2511, and a wing nut 2512; wherein,

[0057] The motion mechanism base 251 is mounted on the mounting base 26. A Z-axis moving cylinder 252 is mounted on its upper surface. A first electric displacement platform 253 is fixedly mounted on the Z-axis moving cylinder 252. A first adapter plate 254 is fixedly mounted on the first electric displacement platform 253 to drive the first adapter plate 254 and its structure to move back and forth. A balance block 256 and a servo motor 255 are fixed to both ends of the first adapter plate 254, respectively. The balance block 256 provides balance for the servo motor 255. The output shaft of the servo motor 255 is connected to the transmission shaft of the adapter block 257 via a synchronous belt. The adapter block 257 is fixed to the first adapter plate 254 via bearings fitted onto the transmission shaft. Driven by the servo motor 255, it drives other mechanisms on the adapter block 257 to rotate. A second electric displacement platform is fixed on the adapter block 257. A second electric displacement platform 258 is used to fix a second adapter plate 259. The lower end of the second adapter plate 259 is fixed with a suction gun 2510 via a suction gun adjustment seat 2511. The second electric displacement platform 258 is used to drive the suction gun 2510 to move up and down, and cooperates with the Z-axis moving cylinder 252 for coarse adjustment to achieve longitudinal fine adjustment. The suction gun adjustment seat 2511 is connected to the second adapter plate 259 by bolts or screws and a wing nut 2512. The tilt angle of the suction gun 2510 is adjusted by rotating the angle of the suction gun adjustment seat 2511. The gun head of the suction gun 2510 is close to the thrust device, and the gun tail is connected to the helium mass spectrometer 3 through a hose for helium mass spectrometry detection. Preferably, a pneumatic valve is set between the suction gun 2510 and the helium mass spectrometer 3 to control the working state of the suction gun 2510.

[0058] The working process of the automatic thrust device airtightness detection equipment in this invention is as follows:

[0059] The thrust device 4 is placed on the thrust device positioning fixture 21 using an automatic or manual method. Then, the inflation fixture 22, the throat sealing fixture 23, the solenoid valve energizing mechanism 24, and the helium mass spectrometry detection motion mechanism 25 operate in the set sequence to complete the throat sealing, inflation, pressure holding, and helium mass spectrometry detection sampling of the thrust device.

[0060] After the helium mass spectrometer 3 completes the detection, nitrogen gas is purged into the thrust device to purge the residual helium gas in the pipeline and thrust device chamber, so as to avoid affecting subsequent measurements.

[0061] After nitrogen purging, the various fixtures in the airtight fixture assembly 2 operate in reverse order to complete the measurement of the airtightness of the thrust device.

[0062] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0063] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. An automatic testing device for the airtightness of a thrust device, characterized in that, It includes at least one set of airtight tooling components (2) and a helium mass spectrometer (3); The airtight tooling assembly (2) is used to position the thrust device, seal the throat, energize the solenoid valve after sealing, inflate the thrust device, maintain pressure, and draw in the gas around the thrust device to supply the helium mass spectrometer (3). The helium mass spectrometer (3) is installed inside the airtight stage assembly (1) and accurately measures the amount of helium leaked during the airtightness test of the thrust device (4) based on the gas supplied by the airtight tooling assembly (2). The airtight tooling assembly (2) includes a thrust device positioning tooling (21), an inflation tooling (22), a throat sealing tooling (23), a solenoid valve energizing mechanism (24), a helium mass spectrometer detection motion mechanism (25), and a mounting base (26). Positioning fixture (21) is used for precise positioning of the thrust device; Inflatable fixture (22) is used to inflate and connect the thrust device; Throat sealing fixture (23) is used to seal the throat of the thrust device nozzle; The solenoid valve energizing mechanism (24) is used to energize the solenoid valve of the thrust device; The helium mass spectrometry detection motion mechanism (25) is used to carry the suction gun to sample the gas around the thrust device and assist in helium mass spectrometry detection. Mounting base (26) is used to support the fixed positioning fixture (21), the inflation fixture (22), the throat sealing fixture (23), the solenoid valve energizing mechanism (24), and the helium mass spectrometer detection motion mechanism (25). The inflation fixture (22) includes an inflation fixture base (221), a rotary clamping cylinder (222), a pressure arm (224), a fixture inflation nozzle (225), an inflation sealing ring (226), and a pipe connector (227). The bottom of the inflation fixture base (221) is fixed on the mounting base (26), and the rotary clamping cylinder (222) is provided on its upper end face. The rotary clamping cylinder (222) has a rotary pressing function, which can drive the pressure arm (224) to swing 90° and press down to connect with the inflation nozzle of the solenoid valve (41). The pressure arm (224) is provided with a tooling inflation nozzle (225). The end of the tooling inflation nozzle (225) is tapered, and its taper is consistent with that of the inflation nozzle of the solenoid valve (41). The end of the tooling inflation nozzle (225) is provided with an inflation sealing ring (226), which seals the inflation nozzle when it is inflated. The upper end of the tooling inflation nozzle (225) is connected to a pipe joint (227), and the pipe joint (227) is connected to the airtight pipeline system of the airtight test bench (11) through a high-pressure hose. The pressure arm (224) is configured as a T-shaped structure, with the tooling inflation nozzle (225) located at one end of the pressure arm (224) and the other end fixed with a balance buffer pin; the upper surface of the inflation tooling base (221) is provided with a rotary pressing cylinder (222) and a balance cylinder (223) arranged side by side, and a buffer pad (228) is provided on the balance cylinder (223) to buffer the balance buffer pin and provide a reaction balance force to the pressure arm (224), so that the resultant force on the rotary pressing cylinder (222) acts in the direction of its piston rod axis.

2. The automatic thrust device airtightness detection equipment according to claim 1, characterized in that, The automatic testing equipment also includes an airtight stage assembly (1), which supports the airtight tooling assembly (2) and the helium mass spectrometer (3), controls the airtight tooling assembly (2) to operate in sequence, and starts and stops the automatic airtightness testing.

3. The automatic thrust device airtightness detection equipment according to claim 2, characterized in that, The airtight test bench assembly (1) includes an airtight test bench (11), which includes a test bench cabinet, an airtight piping system, and a control system. The test bench cabinet is used to house the airtight tooling assembly (2) and the helium mass spectrometer (3). The airtight piping system provides a gas source and gas supply pipeline for the inflation and pressure holding process of the thrust device for airtightness testing, and provides an exhaust pipeline for the exhaust of the thrust device after the test is completed. The control system is used to control the throat sealing, inflation, pressure holding, and helium mass spectrometer sampling of the thrust device.

4. The automatic thrust device airtightness detection equipment according to claim 2, characterized in that, The airtight platform assembly (1) also includes at least one armored chamber (12), an exhaust fan (13), two sets of movable observation windows (14), and two sets of rodless cylinders (15); the armored chamber (12) is made of steel structure or welded steel plate, and operating ports are machined on its front and rear sides respectively; the exhaust fan (13) is set on the top plate of the armored chamber (12) to discharge the residual helium gas after product testing outside the armored chamber (12); the two sets of movable observation windows (14) are set on the front and rear sides of the armored chamber (12), and their periphery is made of steel plate. The structure uses a sheet metal frame with explosion-proof glass in the middle, allowing personnel to observe the activities inside the armored chamber (12) through the movable observation window (14). The rodless cylinder (15) is installed on the upper and lower sides of the front and rear operating ports of the armored chamber (12), and is connected to the front and rear movable observation windows (14) respectively through the adapter block. It is used to drive the two sets of movable observation windows (14) to block or move away from the operating ports of the armored chamber (12), or to drive the front and rear movable observation windows (14) to switch between the armored chambers (12) when there are multiple armored chambers (12).

5. The automatic thrust device airtightness detection equipment according to claim 1, characterized in that, The thrust device positioning fixture (21) includes a positioning fixture mounting base (211), multiple sets of positioning support columns (212), and a throat auxiliary support (213). The positioning fixture mounting base (211) is fixed at the center of the mounting base (26), and the multiple sets of positioning support columns (212) and the throat auxiliary support (213) are fixed on the positioning fixture mounting base (211). The multiple sets of positioning support columns (212) are connected to the flange on the thrust device housing to support and fix the thrust device. The throat auxiliary support (213) supports the throat of the thrust device and is used to provide auxiliary support for the thrust device.

6. The automatic thrust device airtightness detection equipment according to claim 5, characterized in that, The throat auxiliary support (213) consists of multiple sets, which are evenly distributed on the positioning tool mounting base (211). After selecting one of the throat auxiliary supports (213) to support the throat of the thrust device, the cable connector of the solenoid valve (41) on the thrust device (4) is always facing the solenoid valve energizing mechanism (24).

7. The automatic thrust device airtightness detection equipment according to claim 1, characterized in that, The throat plugging fixture (23) includes a plugging fixture base (231), a plugging cylinder (232), a floating groove seat (233), a floating plugging rod (234), an elastic plunger (235), a vent pipe connector (236), a hollow plug (237), and a plugging sealing ring (238). The bottom of the plugging fixture base (231) is fixed on the mounting base (26), and the upper end face of the base is provided with a plugging cylinder (232). The plugging cylinder (232) is a double cylinder. The floating groove seat (233) is set on the piston seat of the plugging cylinder (232). One end of the floating groove seat (233) is provided with a circular floating groove, and multiple sets of elastic plungers (234) are evenly distributed around it. 5); One end of the floating sealing rod (234) is set in the floating groove (233) and contacts the elastic head of the elastic plunger (235). Under the action of external force, the floating sealing rod (234) can float in the floating groove (233); The hollow plug (237) is fixed to the other end of the floating sealing rod (234) by a threaded connection, and a sealing ring (238) is provided between the two; The end of the floating sealing rod (234) near the workpiece is a hollow structure, which is connected to the external exhaust pipe through the vent pipe joint (236). The exhaust pipe is equipped with a solenoid valve. The solenoid valve is disconnected during the inflation and pressure holding process and opened during the exhaust process.

8. The automatic thrust device airtightness detection equipment according to claim 7, characterized in that, The throat blocking fixture (23) is evenly distributed in multiple groups on the mounting base (26) according to the attitude of the thrust device. After the thrust device is positioned by the thrust device positioning fixture (21), the installation position of one of its throat blocking fixtures (23) corresponds to the orientation of the thrust chamber nozzle of each attitude thrust device.

9. The automatic thrust device airtightness detection equipment according to claim 1, characterized in that, The solenoid valve energizing mechanism (24) includes a support base (241), a double cylinder (242), a pin holder (243), four sets of spring pins (244), and a switch probe (245). The support base (241) is mounted on the mounting base (26) across a set of throat sealing fixtures (23), and the double cylinder (242) is set on its upper end face. The pin holder (243) is set on the piston seat of the double cylinder (242). The four sets of spring pins (244) correspond to the pins of the solenoid valve (41) in sequence. Fixed on the contact pin holder (243); the end of the spring contact pin (244) is conical, and after contacting the pin of the solenoid valve (41), it can be tightly connected with the pin of the solenoid valve (41) under the action of spring force; a switch probe (245) is provided below the spring contact pin (244). When the end of the switch probe (245) presses against the solenoid valve (41), it is compressed, triggering a contact signal and feeding it back to the control system. After the double cylinder (242) receives the stop signal, it stops driving the forward spring contact pin (244) forward.

10. The automatic thrust device airtightness detection equipment according to claim 1, characterized in that, The helium mass spectrometry detection motion mechanism (25) includes a motion mechanism base (251), a Z-axis moving cylinder (252), a first electric displacement platform (253), a first adapter plate (254), a servo motor (255), a balance block (256), an adapter block (257), a second electric displacement platform (258), a second adapter plate (259), a suction gun (2510), a suction gun adjustment seat (2511), and a wing nut (2512); the motion mechanism base (251) is mounted on the mounting base (26), and its upper end A Z-axis moving cylinder (252) is provided on the surface. A first electric displacement platform (253) is fixedly installed on the Z-axis moving cylinder (252). A first adapter plate (254) is fixedly installed on the first electric displacement platform (253) for driving the first adapter plate (254) and its structure to move back and forth. A balance block (256) and a servo motor (255) are fixed at both ends of the first adapter plate (254). The balance block (256) provides balance for the servo motor (255). The output shaft of the servo motor (255) is connected to the rotating shaft via a synchronous belt. The drive shaft of the connecting block (257) is connected, and the connecting block (257) is fixed on the first adapter plate (254) by the bearing sleeved on the drive shaft. Under the drive of the servo motor (255), the other mechanisms on the connecting block (257) are rotated; the second electric displacement platform (258) is on the connecting block (257), and the second electric displacement platform (258) is fixed with the second adapter plate (259). The lower end of the second adapter plate (259) is fixed with the suction gun (2510) through the suction gun adjustment seat (2511). The second electric displacement platform (254) is fixed with the first adapter plate (254) by the bearing sleeve on the drive shaft. 58) Used to drive the suction gun (2510) to move up and down, and cooperate with the Z-axis moving cylinder (252) for coarse adjustment to achieve longitudinal fine adjustment; the suction gun adjusting seat (2511) is connected to the second adapter plate (259) by bolts or screws through the suction gun adjusting seat (2511) and the wing nut (2512), and the angle of the suction gun (2510) is adjusted by rotating the angle of the suction gun adjusting seat (2511); the gun head of the suction gun (2510) is close to the thrust device, and the gun tail is connected to the helium mass spectrometer (3) through a hose to perform helium mass spectrometry detection.

Images