A multifunctional tooling and assembly method for spacecraft electric valve products

Abstract

The present invention discloses a multifunctional tooling for a spacecraft electric valve product. A cavity for accommodating the valve product is provided inside the housing. When the compression nut moves up and down, it presses down or relaxes the spring pressure plate. The lower pressure plate contacts the lower end cover of the valve product, and the upper pressure plate contacts the upper end cover of the valve product. The downward movement of the spring pressure plate is converted by the spring into a pre-tightening force applied by the upper pressure plate to the upper end cover of the valve product. The housing is provided with an electrical interface for electrical performance testing. The upper pressure plate is provided with a welding hole for the upper end cover, and the lower pressure plate is provided with a welding hole for the lower end cover. The present invention also discloses a method for assembling a spacecraft electric valve product, which utilizes the multifunctional tooling to complete the pre-tightening force loading, valve core stroke measurement, electrical performance testing, running-in, and welding processes. The present invention can simplify the operations at each workstation during the product assembly process and is a necessary condition for automating the assembly process.

Description

Technical Field

[0001] The invention relates to a multifunctional tool and an assembly method for installation, measurement, testing and welding in the assembly process of a spacecraft electric valve product, belonging to the technical field of electric valves. Background Art

[0002] Most of the electric valve products used in the attitude control propulsion system of my country's spacecraft are solenoid axial flow structures, which are different from similar products in general industrial fields. For example, in order to meet the requirements of miniaturization and lightweight and the control of redundant materials in the assembly process, the threaded structure of the product shell connection is generally no longer designed. The assembly process needs to rely on tools, fixtures and other measures for fixation. Precise indicators and quality requirements also mean that the product needs to be assembled, debugged and tested before the final shell welding connection can be carried out. This makes the whole machine assembly process of the product more complicated and cumbersome than that of electric valve products in general industrial fields. The typical structure of spacecraft electric valve products is as follows: Figure 1 shown.

[0003] The assembly process for spacecraft electric valves requires installation, pressure adjustment and tightening, valve core measurement, testing, and welding. In addition to assembling product parts, the installation process also requires fixtures. Because the product has a threadless connection structure, the housing and end caps must be fixed throughout the entire process. The pressure adjustment and tightening process primarily targets elastic parts in the valve core, requiring a certain amount of fixture force. Valve core measurement primarily involves accurately measuring the valve core's stroke. After electrical performance testing, the housing is secured by electron beam welding. Each product must be secured with fixtures. Because the fixtures obstruct the welding process, spot welding is performed around the perimeter before the fixtures are removed for full circumferential welding. These processes require fixtures to be fixed between various workstations and equipment, and multiple interfaces must be connected. This creates a high workload and low efficiency. Furthermore, each product relies on fixtures throughout the entire process, and the welding process requires secondary welding due to the fixtures. The large tooling investment, maintenance, and doubling of the welding workload increase both the economic and schedule costs of the product. Therefore, there is an urgent need to develop a multifunctional tool that can complete the work of multiple stations with high efficiency and low manpower input. The development of a multifunctional tool is also a must in the automatic assembly system. Summary of the Invention

[0004] The present invention aims to overcome these shortcomings by providing a multifunctional tooling system for spacecraft electric valves. This solves the technical issues of existing spacecraft electric valves, which include complex assembly processes, high tooling investment, maintenance, and welding workload. Compared to traditional methods, this multifunctional tooling system simplifies operations at each workstation and is essential for automating the assembly process.

[0005] Another object of the present invention is to provide an assembly method for a spacecraft electric valve product, which solves the technical problem of low automation level in the existing assembly of spacecraft electric valve products based on the above-mentioned multifunctional tooling.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A multifunctional tooling for a spacecraft electric valve product, comprising a housing, a lower pressure plate, an upper pressure plate, a spring, a spring pressure plate and a compression nut;

[0008] The housing is provided with a cavity for accommodating the valve product; the lower pressure plate is connected to the lower end of the housing, and the upper surface of the lower pressure plate is provided with a first boss that contacts the lower end cover of the valve product; the upper pressure plate is installed inside the housing and located above the lower pressure plate, and the lower surface of the upper pressure plate is provided with a second boss that contacts the upper end cover of the valve product;

[0009] The lower end of the spring contacts the upper surface of the upper pressure plate, and the upper end of the spring contacts the lower surface of the spring pressure plate. The downward movement of the spring pressure plate is converted into a pre-tightening force applied by the upper pressure plate to the upper end cover of the valve product through the spring;

[0010] The compression nut is located above the spring pressure plate and is threadedly connected to the upper end of the housing. The compression nut is used to lock the position of the spring pressure plate;

[0011] The housing is provided with a power-on interface for electrical performance testing and running-in;

[0012] The upper pressing plate, the lower pressing plate or the shell is provided with welding holes for welding the valve products.

[0013] Furthermore, the housing includes a cylindrical structure and a shoulder provided at the lower end of the cylindrical structure, wherein the diameter of the shoulder is larger than the diameter of the cylindrical structure; the power interface is provided on the shoulder, and the shoulder is further provided with a first positioning device, a positioning pin hole and a clamping device;

[0014] Each workstation in the valve product assembly process is provided with a positioning pin, and the positioning pin hole cooperates with the positioning pin to realize the positioning of the valve product multifunctional tooling at the workstation;

[0015] The first positioning device is a magnet. During the assembly process of the valve product, each station is equipped with a second positioning device and a magnetic sensor that attracts the first positioning device. The magnetic sensor detects whether the first positioning device and the second positioning device are aligned and fits the positioning pin hole to provide feedback on whether the positioning pin is properly fitted.

[0016] The welding station during the assembly process of the valve product is equipped with a locking assembly, which locks the multifunctional tooling of the valve product at the welding station when it is turned over through a locking and clamping device.

[0017] Furthermore, the clamping device is a cylindrical structure, which is fixed to the shaft shoulder by screws. The clamping device is symmetrically arranged on the circumference of the shaft shoulder. The clamping device of the welding station fixes the tooling during the 180° flipping process during the welding process by clamping the clamping mechanism.

[0018] The power-on interface includes a power-on male connector and a wiring terminal. A power-on male connector matching hole is left on the shaft shoulder end face of the shell. The power-on male connector and the wiring terminal are fixed to the shaft shoulder end face with screws. The power-on male connector pin extends from the lower end of the shaft shoulder end face. The valve lead is connected to the wiring terminal. When the tooling is installed to the valve core measurement, electrical performance test, and running-in station, it is connected to the power-on female connector on the station during the mechanical positioning process, thereby realizing automatic power-on connection at the station.

[0019] Furthermore, the axis of the valve product coincides with the axis of the housing, and the centers of the lower pressing plate and the upper pressing plate are respectively provided with a first through hole and a second through hole;

[0020] The lower end cover and the upper end cover of the valve product are respectively provided with a lower end cover joint and an upper end cover joint. The first boss of the lower pressure plate is used to contact the end surface of the lower end cover of the valve product. The lower end cover joint of the valve product extends out of the lower pressure plate through the first through hole. The second boss of the upper pressure plate is used to contact the end surface of the upper end cover of the valve product. The upper end cover joint of the valve product extends out of the upper pressure plate through the second through hole.

[0021] A third through hole is provided in the center of the spring pressure plate for the upper end cover joint of the valve product to pass through.

[0022] Furthermore, the first boss of the lower pressure plate and the second boss of the upper pressure plate are both annular bosses, and the outer diameter of the annular bosses is less than or equal to the diameter of the lower end cover and the upper end cover of the valve product.

[0023] Furthermore, a first groove and a second groove are respectively provided on the upper surface of the upper pressure plate and the lower surface of the spring pressure plate, and the lower end and the upper end of the spring are limited by the first groove and the second groove respectively.

[0024] Furthermore, the shell is provided with guide grooves in the up-down direction, the number of the guide grooves is ≥3, and the guide grooves are evenly distributed along the circumference of the shell;

[0025] The spring pressure plate includes a pressure plate body and a pressure claw connected to the edge of the pressure plate body. The pressure plate body is located inside the shell, and the pressure claw extends out of the shell from the guide groove. When the clamping nut moves up and down, it presses down or relaxes the pressure claw of the spring pressure plate, causing the pressure claw to move downward or upward along the guide groove.

[0026] Furthermore, the spring is a multi-layer wave spring;

[0027] An external thread for threaded connection with a compression nut is provided on the outer surface of the shell, and the length of the external thread is greater than or equal to the length of the spring compression.

[0028] Furthermore, a clamping mechanism is provided on the outer surface of the shell;

[0029] The clamping mechanism includes a trapezoidal table and a cylindrical rod. The cylindrical rod is provided with an external thread. The end of the cylindrical rod provided with the external thread is recorded as the threaded end, and the end of the cylindrical rod not provided with the external thread is recorded as the cylindrical end. The threaded end passes through the trapezoidal table to fix the trapezoidal table on the shell. The cylindrical end is exposed on the outside of the trapezoidal table and is clamped with the robotic arm claw. The large end face of the trapezoidal table cooperates with the outer surface of the shell, and the small end face of the trapezoidal table is away from the outer surface of the shell. The trapezoidal table is used to limit the rotation of the robotic arm claw.

[0030] Furthermore, the welding holes include an upper end cover welding hole provided on the upper pressure plate for welding the upper end cover of the valve product and the outer shell, a lower end cover welding hole provided on the lower pressure plate for welding the lower end cover of the valve product and the outer shell, and a circumferential welding hole provided on the shell;

[0031] The welding holes of the upper end cover are three waist-shaped holes evenly distributed around the circumference. The positions of the waist-shaped holes correspond to the fitting seams between the upper end cover and the outer shell of the valve product.

[0032] The welding holes of the lower end cover are three waist-shaped holes evenly distributed around the circumference. The positions of the waist-shaped holes correspond to the fitting seam between the lower end cover and the outer shell of the valve product.

[0033] The position of the circumferential welding holes corresponds to the fitting seam on the valve product housing.

[0034] A method for assembling a spacecraft electric valve product, comprising:

[0035] The valve product is installed in the multifunctional tooling of the above-mentioned spacecraft electric valve product. The robotic arm drives the multifunctional tooling of the valve product to move to the first station (preload force loading station) through the clamping mechanism, and is positioned through the pin hole. The positioning device completes the installation and positioning of the tooling at the station through the feedback of the position signal from the sensor;

[0036] The external preload loading device presses down the spring pressure plate, which moves downward and applies preload force to the valve core of the valve product through the spring, upper pressure plate and upper end cover of the valve product in sequence. After the preload force is applied in place, the compression nut is tightened to lock the position of the spring pressure plate;

[0037] The robotic arm drives the multifunctional tooling of the valve product to the second station. The positioning method is the same as that of the first station. During the positioning process, the power-on interface is connected to the power-on interface of the station to achieve conduction. After positioning, the power-on interface is used to measure the valve core stroke, test the electrical performance, and run-in the valve product.

[0038] The robotic arm drives the multifunctional tooling of the valve product to move to the third station (welding station) through the clamping mechanism. The positioning method is the same as that of the first station. After positioning, the clamping device is fixed by the locking assembly of the station, and the valve product is welded using the welding hole. During the welding process, the multifunctional tooling of the valve product is turned over to align the welding hole with the welding device.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) The present invention creatively proposes a multifunctional tooling for spacecraft electric valve products, which achieves stable and convenient application of preload force to the valve products, providing a basis for subsequent assembly and testing processes;

[0041] (2) The multifunctional tooling of the present invention can solve the problems of installation, positioning and rapid connection of interfaces at each workstation during the assembly process of the product. Compared with the traditional operation mode, it simplifies the operation at each workstation, which is a necessary condition for realizing the automation of the assembly process;

[0042] (3) The present invention can reduce the number of operating steps, reduce errors caused by human factors in manual operation and measurement processes, and improve the consistency of product assembly quality;

[0043] (4) The present invention can effectively promote the integration of production stations and equipment, facilitate production management, and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the valve product structure;

[0045] Figure 2 This is a cross-sectional view of the multifunctional tooling structure of the spacecraft electric valve product of the present invention;

[0046] Figure 3 This is a structural diagram of the multifunctional tooling structure interface of a spacecraft electric valve product, where (a) is a stereoscopic diagram from one perspective, (b) is a top view, and (c) is a stereoscopic diagram from another perspective;

[0047] In the figure: 1-valve product, 2-housing, 3-lower pressure plate, 4-upper pressure plate, 5-spring, 6-spring pressure plate, 7-tensioning nut, 8-guide groove, 9-external thread, 10-pressure claw, 11-tightening groove, 12-first positioning device, 13-positioning pin hole, 14-pressing mechanism, 15-power interface, 16-clamping mechanism, 17-upper end cover welding hole, 18-lower end cover welding hole, 19-circumferential welding hole. DETAILED DESCRIPTION

[0048] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0049] The word "exemplary" is used exclusively herein to mean "serving as an example, example, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0050] During the assembly process of spacecraft electric valve products, installation, measurement, testing, welding and other links are required, and fixation and connection of multiple interfaces are required between different workstations and equipment. The present invention designs a multifunctional tooling structure, which can realize the installation, positioning and rapid connection of interfaces of various processes such as preload, valve core stroke measurement, electrical performance testing, running-in, welding, etc. during the product assembly process. It can simplify the operation of each workstation during the product assembly process and is a necessary condition for realizing the automation of the assembly process.

[0051] Specifically, the present invention provides a multifunctional tooling structure for spacecraft electric valves, designed to facilitate installation, positioning, and rapid interface connection during various process steps. This technical solution addresses automated assembly, which requires additional fixing and transport structures or interfaces compared to manual assembly.

[0052] The multifunctional tooling structure of the above-mentioned spacecraft electric valve product is applied to the automatic assembly process of the valve product as follows:

[0053] Preload → Valve core stroke measurement → Electrical performance test → Running-in → Welding

[0054] The multifunctional tooling structure of the above-mentioned spacecraft electric valve product includes: a shell, a lower pressure plate, an upper pressure plate spring, a spring pressure plate, and a clamping nut. The lower pressure plate and the upper pressure plate are provided with upper end cover welding holes and lower end cover welding holes, and the shell is provided with circumferential welding holes. Optionally, a tightening groove is provided on the clamping nut, a clamping mechanism is provided on the outer surface of the shell, and a clamping mechanism, a first positioning device, a positioning pin hole, and an electrical interface are provided on the shaft shoulder of the shell.

[0055] The above-mentioned multifunctional tooling structure of the spacecraft electric valve product and the valve product installation and fixing function solution: Since the assembled valve product has a non-threaded structure, the product parts cannot be fixed. The shell, upper pressure plate and lower pressure plate provide product fixation throughout the assembly process, and the upper and lower pressure plates press the product parts tightly inside the cylindrical cavity of the shell.

[0056] The multifunctional tooling structure of the above-mentioned spacecraft electric valve product has a preload solution: the clamping force for fixing the product parts is provided by the spring, spring pressure plate and tightening nut. The required preload force is achieved by tightening the spring pressure plate, and the tightening nut provides fixation after the preload force is in place.

[0057] The above-mentioned multifunctional tooling structure of the spacecraft electric valve product has an interface function scheme: the pin hole on the shell serves as the positioning interface of each workstation; the positioning device installed on the shell serves as the interface of the in-place detection sensor; the tightening groove on the tightening nut serves as the interface for tightening after the preload force loading process is loaded into place; the upper end of the shell is provided with a shell installation electrical interface, which serves as the electrical interface for electrical performance testing and running-in processes; the locking interface on the shell serves as a fixed interface during the rotation and flipping process of the welding process; the clamping mechanism on the shell serves as the clamping and transfer interface between the workstations; the upper pressure plate opening is the upper end cover welding hole, the lower pressure plate opening is the lower end cover welding hole, and the shell circumferential opening is the circumferential welding hole, providing windows for the upper and lower end covers and circumferential welds of the product during the spot welding process.

[0058] The above-mentioned spacecraft electric valve product has a multifunctional tooling structure and a product installation method: first, the lower pressure plate is fixedly connected to the shell, and after the valve product parts are assembled, they are placed in the cylindrical cavity inside the shell. The upper pressure plate, spring, spring pressure plate are placed on the upper part of the product in sequence, and the tightening nut is screwed on.

[0059] The above-mentioned multifunctional tooling structure of the spacecraft electric valve product and the automatic process flow implementation plan are as follows: the preload force loading process uses the clamping mechanism as the transfer interface to align and fix the tooling pin hole with the pin on the workstation. The workstation receives the signal of the positioning device to determine that the product is at the workstation. The downward pressure device on the workstation applies pressure to the spring pressure plate. After the pressure is in place, the nut is tightened by tightening the tightening groove on the tightening nut; the valve core stroke measurement, electrical performance test, and running-in process are carried out at the same workstation. The tooling positioning and feedback are the same as the previous link. At the same time as positioning, the power-on interface and the electrical interface on the workstation are also connected. The non-contact measuring device of the workstation measures the running stroke of the valve core through the product connector exposed on the spring pressure plate. The electrical performance of the product can be tested in parallel during the movement. After completion, the product switch is run-in; the tooling positioning and feedback of the welding process are the same as the previous link, and the tooling and the workstation are pressed together by the clamping mechanism to fix the product's flipping function at the workstation. The upper and lower end covers and circumferential welds of the product are spot welded through the upper end cover welding holes, lower end cover welding holes, and circumferential welding holes to fix the product shell.

[0060] As attached Figure 2 、 Figure 3As shown, in a preferred embodiment, a multifunctional tooling for a spacecraft electric valve product includes a shell 2, a lower pressure plate 3, an upper pressure plate 4, a spring 5, a spring pressure plate 6 and a clamping nut 7. The lower pressure plate 3 is fixed to the shell 2 with 6 countersunk screws passing through the screw holes. After the lower pressure plate 3 is installed, the plane must be lower than the bottom surface of the shell to ensure that the bottom surface of the shell serves as the installation reference surface of the process. The shell 2 and the lower pressure plate 3 form a cylindrical cavity for accommodating the valve product 1; the upper pressure plate 4 presses the upper end surface of the valve product, and the spring 5 is pressed on the upper pressure plate 4 through the spring pressure plate 6 as a pressure transmission structure; after the lower pressure plate 3 is connected to the shell 2, the bottom surface must be lower than the bottom surface of the shell 2 shoulder; the lower pressure plate 3 is a central through-hole structure, and the lower end cover joint of the valve product 1 passes through the through-hole. A boss is left at the pressing part of the lower pressure plate 3 and the valve product 1, and the boss only contacts the lower end cover surface of the valve product 1; after the valve product 1 is placed in the cavity of the shell 2, the valve product 1 An upper pressure plate 4 is placed on it. The upper pressure plate 4 is a central through-hole structure. The upper end cover joint of the valve product 1 passes through the through-hole. A boss is left at the pressing position of the upper pressure plate 4 and the valve product 1, and the boss only contacts the upper end cover surface of the valve product 1; a spring 5 and a spring pressure plate 6 are arranged on the upper pressure plate 4. The spring pressure plate 6 is a central through-hole structure. The upper end cover joint of the valve product 1 passes through the through-hole. The end faces of the upper pressure plate 4 and the spring pressure plate 6 in contact with the spring 5 are provided with a concave step to position the spring; an external thread 9 is provided on the upper end of the shell 2, and a tightening nut 7 is connected to the external thread 9. The tightening nut 7 is tightened through the external thread 9 on the upper part of the shell 2 to tighten the spring pressure plate 6. The external thread on the upper part of the shell 2 is sufficient to meet the length of the spring pressure plate 6 to compress the spring 5.

[0061] Three guide grooves 8 are evenly distributed on the circumference of the external thread on the upper part of the housing 2, and three evenly distributed pressure claws 10 are provided on the circumference of the spring pressure plate 6. The three pressure claws 10 extend from the three guide grooves 8 of the housing 2. After the clamping nut 7 is connected to the external thread 9, it is pressed on the three pressure claws 10. The clamping nut 7 transmits the clamping force from the pressure claws 10 extending from the housing 2 through the spring pressure plate 6.

[0062] As attached Figure 1 、 Figure 2 As shown, as a preload function part, the upper pressure plate 4 is provided with an annular boss, the outer diameter of the boss is not larger than the diameter of the upper end cover of the valve product, to ensure that the lower bottom surface of the upper pressure plate 4 is pressed on the valve end cover, and the elastic parts of the valve core are loaded with force through the valve end cover; the spring 5 uses a multi-layer wave spring to meet the characteristics of small installation space and stable structure. In order to facilitate the tightening control of the clamping nut 7, the spring stiffness is selected so that the spring compression amount in the loaded state is about half of the compression stroke; the upper end face of the upper pressure plate 4 and the lower end face of the spring pressure plate 6 are provided with a 0.5mm deep step (first groove and second groove) near the outer circular end. The step plays a positioning role for the spring to prevent the spring from rubbing against the inner wall of the outer shell 2.

[0063] As attached Figure 2As shown, the tooling structure that provides the interface function of the entire process includes two tightening grooves 11 evenly distributed along the circumference of the clamping nut 7. The grooves are 6mm wide and 8mm deep and symmetrical at both ends. The grooves match the tightening device of the preload force loading station; two magnets with a diameter of 6mm are evenly distributed along the circumference of the shaft shoulder of the shell 2. The magnets serve as the first positioning device 12 and cooperate with the magnetic sensors of each station to provide an in-position detection signal. The magnets are fixed to the through holes of the shaft shoulder of the shell 2, and the bottom surface of the magnets is kept flush with the bottom surface of the shaft shoulder of the shell 2; along the circumference of the shaft shoulder of the shell 2 Two positioning pin holes 13 and two clamping mechanisms 14 are evenly distributed. The pin holes and the fixed pins on the workstation are matched with sliding clearances to achieve mechanical positioning of the tooling installed on the workstation; the clamping mechanism 14 is a screw that fixes the cylindrical ring to the shaft shoulder of the shell 2 and is symmetrically arranged on the circumference of the shaft shoulder. When in the welding station, the electric or pneumatic locking assembly of the welding station clamps the clamping device 14 to achieve 180° flipping process during welding to fix the tooling; the power-on interface 15 is composed of a power-on male head and a terminal block. The shaft of the shell 2 A matching hole for the power-on male connector is left on the shoulder end face, and the power-on male connector and the terminal block are fixed to the shoulder end face with screws. The power-on male connector pin extends from the lower end of the shoulder end face. When the tooling is installed to the valve core stroke measurement, electrical performance test, and running-in station, it is connected to the power-on female connector on the station during the mechanical positioning process, thereby realizing automatic power connection at the station; two clamping mechanisms 16 are evenly distributed around the circumference of the housing 2, and the clamping mechanism 16 consists of a trapezoidal table and a threaded cylindrical rod. The threaded cylindrical rod fixes the trapezoidal table through the through hole in the center of the trapezoidal table. On the circumference of the shell 2, two clamping mechanisms 16 are symmetrically arranged on the circumference of the shell 2. When the robot arm grabs the tooling for transfer, the trapezoidal platform of the clamping mechanism 16 is tightly fitted with the robot arm claws to prevent the tooling from shaking during the transfer process. The threaded cylindrical rod acts as a pin to cooperate with the robot arm claws to prevent slipping and fix the tooling during the transfer process; the pressure plate 4 is evenly distributed along the circumference with three upper end cover welding holes 17; the lower pressure plate 3 is evenly distributed along the circumference with three lower end cover welding holes 18; the shell 2 is evenly distributed along the circumference with three circumferential welding holes 19. The upper end cover welding holes 17 are three waist-shaped holes evenly distributed on the circumference of the upper pressure plate. The position of the waist-shaped holes on the circumferential diameter is such that the fitting seam between the valve product shell and the upper end cover can be exposed. During the welding process, the laser beam passes through the upper end cover welding holes 17 to weld the valve product shell and the upper end cover at positions evenly distributed along the circumference, thereby fixing the upper cover and the shell, and making the subsequent processes of the valve product independent of tooling; the lower end cover welding holes 18 are three waist-shaped holes evenly distributed on the circumference of the lower pressure plate, which have the same function as the upper end cover welding holes and are welding windows for the lower end cover and the shell of the valve; the circumferential welding holes 19 are welding windows provided for valve products whose shells need to be connected circumferentially in the valve structure design. The circumferential welding holes 19 are set when the valve product shell is welded by two or more parts, and the fitting seam between the two adjacent parts of the shell corresponds to the circumferential welding holes 19.

[0064] The multifunctional tooling structure of spacecraft electric valve products is used in the product assembly process: first, the tooling is used to fix the product, the lower pressure plate 3 is fixed to the shell 2 with screws, the valve product is placed in the cylindrical cavity formed by the shell 2 and the lower pressure plate 3, and the upper pressure plate 4 is placed to press the upper end face of the valve product, and then the spring 5 is placed in turn, the pressure claw 10 of the spring pressure plate 6 is placed in the guide groove 8, the tightening nut 7 is installed to the external thread 9, and the pressure claw 10 of the spring pressure plate 6 is pressed to complete the fixation of the product; the valve product process flow includes preload force loading, valve core stroke measurement, electrical performance testing, running-in, and welding. In the preload process, the robot arm transports the tooling to the workstation through the clamping mechanism 16, and positions it through the pin hole 13. The first positioning device 12 completes the installation and positioning of the tooling on the workstation through the sensor feedback signal. The preload loading device (force measuring device) applies pressure by pressing the spring pressure plate 6. After it is in place, it is locked by tightening the tightening nut 7 through the tightening groove 11 to complete the preload loading process; the valve core stroke measurement, electrical performance test, and running-in process have the same requirements for the workstation, and the transfer positioning process is the same as above. The power interface 15 is also connected during the positioning process. After the positioning is completed, the valve core stroke measurement, electrical performance test and running-in are performed on the product; the positioning of the welding process is the same as the preload loading process. After it is in place, the upper end cover and the outer shell of the valve are welded through the upper end cover welding hole 17, the clamping mechanism 14 is fixed, the tooling is flipped 180°, the lower end cover and the outer shell of the valve are welded through the lower end cover welding hole 18, and the shell 2 weld is welded through the circumferential welding hole 19.

[0065] 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 appreciate that various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present invention without departing from the spirit and scope of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

[0066] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A multifunctional tooling for spacecraft electric valve products, characterized in that: It comprises a housing (2), a lower pressing plate (3), an upper pressing plate (4), a spring (5), a spring pressing plate (6) and a pressing nut (7); A cavity for accommodating the valve product (1) is provided inside the housing (2); a lower pressure plate (3) is connected to the lower end of the housing (2), and a first boss is provided on the upper surface of the lower pressure plate (3) for contacting the lower end cover of the valve product (1); an upper pressure plate (4) is installed inside the housing (2) and is located above the lower pressure plate (3), and a second boss is provided on the lower surface of the upper pressure plate (4) for contacting the upper end cover of the valve product (1); The lower end of the spring (5) contacts the upper surface of the upper pressure plate (4), and the upper end of the spring (5) contacts the lower surface of the spring pressure plate (6). The downward movement of the spring pressure plate (6) is converted into a pre-tightening force applied by the upper pressure plate (4) to the upper end cover of the valve product (1) through the spring (5); The clamping nut (7) is located above the spring pressure plate (6) and is threadedly connected to the upper end of the housing (2). The clamping nut (7) is used to lock the position of the spring pressure plate (6); The housing (2) is provided with a power-on interface (15) for electrical performance testing and running-in; The upper pressing plate (4) or the lower pressing plate (3) or the housing (2) is provided with welding holes for welding the valve product (1); The housing (2) is provided with guide grooves (8) in the up-down direction, the number of the guide grooves (8) is ≥3, and the guide grooves (8) are evenly distributed along the circumference of the housing (2); The spring pressure plate (6) includes a pressure plate body and a pressure claw (10) connected to the edge of the pressure plate body. The pressure plate body is located inside the housing (2). The pressure claw (10) extends out of the housing (2) from the guide groove (8). When the clamping nut (7) moves up and down, it presses down or releases the pressure claw (10) of the spring pressure plate (6), so that the pressure claw (10) moves downward or upward along the guide groove (8). A clamping mechanism (16) is provided on the outer surface of the housing (2); The clamping mechanism (16) includes a trapezoidal platform and a cylindrical rod, the cylindrical rod is provided with an external thread, the end of the cylindrical rod provided with the external thread is recorded as the threaded end, and the end of the cylindrical rod not provided with the external thread is recorded as the cylindrical end, the threaded end passes through the trapezoidal platform to fix the trapezoidal platform on the shell (2), the cylindrical end is exposed outside the trapezoidal platform and is clamped with the mechanical arm claw, the large end face of the trapezoidal platform is matched with the outer surface of the shell (2), and the small end face of the trapezoidal platform is away from the outer surface of the shell (2), and the trapezoidal platform is used to limit the rotation of the mechanical arm claw; The welding holes include an upper end cover welding hole (17) provided on the upper pressing plate (4) for welding the upper end cover of the valve product (1) and the outer shell, a lower end cover welding hole (18) provided on the lower pressing plate (3) for welding the lower end cover of the valve product (1) and the outer shell, and a circumferential welding hole (19) provided on the shell (2); The upper end cover welding holes (17) are three waist-shaped holes evenly distributed around the circumference, and the positions of the waist-shaped holes correspond to the matching seams between the upper end cover and the outer shell of the valve product (1); The lower end cover welding holes (18) are three waist-shaped holes evenly distributed around the circumference, and the positions of the waist-shaped holes correspond to the matching seams between the lower end cover and the outer shell of the valve product (1); The position of the circumferential welding hole (19) corresponds to the fitting seam on the outer shell of the valve product (1).

2. The multifunctional tooling for a spacecraft electric valve product according to claim 1, characterized in that: The housing (2) includes a cylindrical structure and a shaft shoulder provided at the lower end of the cylindrical structure, wherein the diameter of the shaft shoulder is larger than the diameter of the cylindrical structure; the power supply interface (15) is provided on the shaft shoulder, and the shaft shoulder is also provided with a first positioning device (12) and a positioning pin hole (13); Each workstation during the assembly process of the valve product (1) is provided with a positioning pin, and the positioning pin hole (13) cooperates with the positioning pin to realize the positioning of the multifunctional tooling of the valve product at the workstation; The first positioning device (12) is a magnet. Each workstation in the assembly process of the valve product (1) is provided with a second positioning device and a magnetic sensor that attract the first positioning device (12). The magnetic sensor detects whether the first positioning device (12) and the second positioning device are aligned and fit together, and then feedback whether the positioning pin hole (13) and the positioning pin are in place.

3. A multifunctional tooling for a spacecraft electric valve product according to claim 1 or 2, characterized in that: The axis of the valve product (1) coincides with the axis of the housing (2), and the centers of the lower pressing plate (3) and the upper pressing plate (4) are respectively provided with a first through hole and a second through hole; The lower end cover and the upper end cover of the valve product (1) are respectively provided with a lower end cover joint and an upper end cover joint, the first boss of the lower pressure plate (3) is used to contact the end face of the lower end cover of the valve product (1), the lower end cover joint of the valve product (1) extends out of the lower pressure plate (3) through the first through hole, the second boss of the upper pressure plate (4) is used to contact the end face of the upper end cover of the valve product (1), and the upper end cover joint of the valve product (1) extends out of the upper pressure plate (4) through the second through hole; A third through hole is provided at the center of the spring pressure plate (6) for the upper end cover joint of the valve product (1) to pass through.

4. The multifunctional tooling for a spacecraft electric valve product according to claim 3, characterized in that: The first boss of the lower pressing plate (3) and the second boss of the upper pressing plate (4) are both annular bosses, and the outer diameter of the annular bosses is less than or equal to the diameter of the lower end cover of the valve product (1) and the upper end cover of the valve product (1).

5. A multifunctional tooling for a spacecraft electric valve product according to claim 1 or 2, characterized in that: The upper surface of the upper pressure plate (4) and the lower surface of the spring pressure plate (6) are respectively provided with a first groove and a second groove, and the lower end and the upper end of the spring (5) are respectively limited by the first groove and the second groove.

6. A multifunctional tooling for a spacecraft electric valve product according to claim 1 or 2, characterized in that: The spring (5) is a multi-layer wave spring; The outer surface of the housing (2) is provided with an external thread for threaded connection with the compression nut (7), and the length of the external thread is greater than or equal to the compressed length of the spring (5).

7. A method for assembling a spacecraft electric valve product, characterized in that: include: The valve product (1) is installed in the multifunctional tooling for a spacecraft electric valve product according to any one of claims 1 to 6, and the robotic arm drives the multifunctional tooling for the valve product to move to the first station; The external preload loading device presses the spring pressure plate (6) downward, and the spring pressure plate (6) moves downward to apply preload force to the valve core of the valve product (1) through the spring (5), the upper pressure plate (4) and the upper end cover of the valve product (1). After the preload force is applied in place, the clamping nut (7) is tightened to lock the position of the spring pressure plate (6); The robotic arm drives the multifunctional tooling of the valve product to move to the second workstation, and uses the power-on interface (15) to measure the valve core stroke, perform electrical performance testing, and run-in on the valve product (1); The robotic arm drives the multifunctional tooling for valve products to move to the third station, and the valve product (1) is welded using the welding hole. During the welding process, the multifunctional tooling for valve products is turned over so that the welding hole is aligned with the welding device.

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