Mainframe head for repair welding of temperature control plug of carrier rocket storage tank

Abstract

The invention discloses a carrier rocket storage tank temperature control plug repair welding main machine head, and relates to the technical field of carrier rocket storage tank plug repair welding. The carrier rocket storage tank temperature control plug repair welding main machine head comprises a main machine shell and a control system box, the rear end face of the main machine shell is fixedly connected with a middle shell, the rear end of the middle shell is fixedly connected with a tension and compression shell, the outer surface of the main machine shell is provided with a water cooling device, and the water cooling device comprises two connectors. The two connectors are fixedly connected to the outer surface of the main machine shell, the outer surfaces of the two connectors are fixedly connected with water pipes, through automatic control over the temperature, the pressure, the rotating speed and the like of a welding part, the problem that the quality of a welding seam is poor after high-revolution braking is solved, the welding heat affected area is reduced, the residual stress of the welding seam is reduced, and welding deformation is reduced. The mechanical property and fatigue strength of a welding seam are improved, and the comprehensive performance of a welding connector is improved; the stability of friction welding heat input quantity is guaranteed, the process control difficulty in the welding process is reduced, and accurate control over the welding process is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of repair welding of launch vehicle tank plugs, in particular to a repair welding main head of a launch vehicle tank temperature control plug. Background Art

[0002] The current aerospace field is gradually starting up and forming a certain scale. The current mainstream launch vehicle tank is an aluminum alloy tank. The welding of aluminum alloy rocket tanks has gradually adopted stir friction welding technology to replace the traditional fusion welding technology. When welding the weld of the aluminum alloy rocket tank, due to the structural characteristics of stir friction welding, the stirring needle in the stirring head is withdrawn when the weld is completed, which will cause a hole defect, namely the stirring key hole; at the same time, the aluminum alloy rocket tank itself has smaller defects or smaller defects generated during stir friction welding. At this stage, fusion welding is used to fill the holes or smaller defects, but it brings about poor weld appearance, reduced welding strength, large residual welding stress and other problems, which affects the quality of the aluminum alloy rocket tank weld. The use of plug welding technology can effectively solve the many problems caused by fusion welding to fill holes or smaller defects.

[0003] Plug welding belongs to friction welding technology, which adopts solid phase welding process without stirring needle. There is no melting of base metal. Compared with fusion welding process: small welding heat affected area, low weld residual stress, small welding deformation, and can also improve the mechanical properties and fatigue strength of welds, and the comprehensive performance of welded joints is high; at the same time, the heat input of friction welding is stable, and precise control of welding parameters can be achieved. There are two solutions now, but these two solutions have certain defects, as follows:

[0004] The hydraulic solution uses a hydraulic motor to rotate the plugging rod and reverse the hydraulic motor to achieve braking. The main disadvantages of this solution are:

[0005] 1. Plug welding requires high speed to ensure welding friction temperature, which results in large volume of equipment related to the hydraulic system, large overall volume, heavy weight and high equipment cost;

[0006] 2. The hydraulic system makes the design of the pull-out structure extremely difficult;

[0007] 3. Due to any nonlinearity or hysteresis of the hydraulic motor, the speed control accuracy and brake control accuracy are poor;

[0008] 4. The reverse filling and braking time of the hydraulic motor is long, resulting in poor quality of the plug welding seam. Therefore, the hydraulic solution does not have the engineering capability of the plug welding equipment.

[0009] The electric solution uses a motor to rotate and brake the plugging rod. The main disadvantages of this solution are: plugging welding requires a high speed, and due to the space limitation of the pull-out structure, braking can only be achieved by reversing the motor. The high speed leads to a long braking time, resulting in poor quality of the plugging weld.

[0010] Therefore, a launch vehicle aluminum alloy tank stir friction annular seam plug welding equipment with high speed and high precision control, extremely short braking time, guaranteed plugging weld quality, a pulling mechanism, small size and light weight is needed to solve this problem. Summary of the invention

[0011] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a main head for temperature control plug repair welding of a launch vehicle tank, which can solve the problem of poor quality of the plug repair welding of the stir friction ring seam plug repair welding equipment of the launch vehicle aluminum alloy tank.

[0012] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a main engine head for repairing the temperature control plug of a launch vehicle tank, comprising a main engine shell and a control system box, the rear end surface of the main engine shell is fixedly connected with an intermediate shell, the rear end of the intermediate shell is fixedly connected with a tension and compression shell, the outer surface of the main engine shell is provided with a water cooling device, the water cooling device comprises two connectors, the two connectors are fixedly connected to the outer surface of the main engine shell, the outer surfaces of the two connectors are fixedly connected with water pipes, the ends of the two water pipes away from the connectors are fixedly connected with a water cooler, the water cooler performs circulating water flow, one of the two connectors is a water inlet, and the other is a water outlet;

[0013] Wherein, the outer surface of the tension and compression shell is provided with the same water cooling device;

[0014] Among them, a rotating motor is fixedly connected to the inside of the main engine housing, and a certain gap is provided near the connecting head of the rotating motor to form a cooling water channel, which facilitates the water of the water cooler to enter the cooling water channel between the main engine housing and the rotating motor for water circulation. The front end of the main engine housing is fixedly connected to the front side housing, and a connecting shaft front bearing is arranged inside the main engine housing. The outer ring of the connecting shaft front bearing is fixedly connected to the main engine housing, the stator of the rotating motor is fixedly connected to the main engine housing, the rotor of the rotating motor is fixedly connected to the connecting shaft, the inner ring of the connecting shaft front bearing is fixedly connected to the connecting shaft, and the front side housing is used to tighten the connecting shaft front bearing to prevent the connecting shaft front bearing from shifting after rotation.

[0015] Preferably, the control system box is a control box, and the electrical components inside are of existing structure, which can control the temperature of the water cooler;

[0016] Among them, the interior of the intermediate shell is fixedly connected to the rear bearing of the connecting shaft, the inner ring of the rear bearing of the connecting shaft is fixedly connected to the center shaft, the front end outer surface of the center shaft is provided with an external spline structure, the interior of the connecting shaft is hollow, and the interior of the connecting shaft is provided with an internal spline structure. The center shaft and the connecting shaft are connected through the spline structure, and the cooperation of the spline structure transmits the rotational torque. A rotational speed sensor is provided on the rear end outer surface of the connecting shaft, and the control system box can read the data of the rotational speed sensor to control the speed.

[0017] Preferably, the interior of the tension-compression shell is fixedly connected to a tension-compression motor, the stator of the tension-compression motor is fixedly connected to the tension-compression shell, the interior of the tension-compression shell is fixedly connected to a first nut bearing, the inner ring of the first nut bearing is fixedly connected to the first nut, the first nut bearing is located at the front and rear ends of the first nut, the outer middle part of the first nut is fixedly connected to the rotor of the tension-compression motor, the inner cavity of the first nut is threadedly connected to a tension-compression shaft, the inner cavity of the first nut and the tension-compression shaft adopt trapezoidal thread transmission to realize the tension-compression bidirectional movement of the tension-compression shaft in the inner cavity of the first nut.

[0018] Preferably, the rear end of the first nut is fixedly connected to a tension-compression anti-rotation seat, the rear end of the tension-compression anti-rotation seat is fixedly connected to a mainframe rear cover, a sliding key is provided inside the mainframe rear cover, the tension-compression anti-rotation seat cooperates with the shaft hole of the mainframe rear cover, and together with the sliding key, the first nut, the tension-compression shaft and the tension-compression anti-rotation seat are prevented from rotating.

[0019] Preferably, a distance measuring sensor is fixedly installed inside the rear cover of the main engine, and the control system box can read and control the rotation speed through the distance measuring sensor, and can accurately measure the tension and compression movement position control, and a tension and compression rotation speed sensor is fixedly installed on the outer side of the rear end of the first nut;

[0020] A central shaft rear bearing seat is arranged inside the tension and compression shaft, a central shaft rear bearing is fixedly connected inside the central shaft rear bearing seat, an inner ring of the central shaft rear bearing is fixedly connected to the central shaft, and a force sensor is fixedly connected to the rear end of the central shaft rear bearing seat.

[0021] Preferably, the rear side of the force sensor is installed on the inner cavity end face of the tension and compression anti-rotation seat. The force sensor can measure the tension and pressure of the central axis. The related structure of the tension and compression bearing seat and the force sensor can slide on the tension and compression shaft and the tension and compression anti-rotation seat to ensure the force measurement accuracy.

[0022] Preferably, the central shaft is a hollow structure, and the outer shaft hole at the front end of the central shaft cooperates with the rear bearing of the central shaft to realize the center positioning of the central shaft;

[0023] The front end of the inner cavity of the center shaft is a standard tapered hole. The front end of the center shaft is threadedly connected with a tool handle key, which can be replaced. The internal thread of the center shaft is connected with a second nut, which is fixedly connected to the pull rod shaft. The pull rod shaft is installed in the inner cavity of the center shaft for bidirectional movement of the center shaft in tension and compression.

[0024] Preferably, a tool handle is fixedly installed on the front end of the inner cavity of the central shaft through a tool handle key, the tool handle is installed using a tool handle key, a plugging rod is provided inside the tool handle, an elastic collet is installed inside the tool handle, a tank workpiece is provided on the front outer end face of the workpiece connecting seat, the front outer end face of the workpiece connecting seat supports the tank workpiece, and an annular heat insulation block and a heating plate are fixedly installed in sequence on the front inner end face of the workpiece connecting seat, the heating plate realizes preheating of the welding part of the tank workpiece, and a temperature sensor is fixedly installed at the welding part of the tank workpiece.

[0025] Preferably, the tool handle fixes and clamps a plugging rod made of the same material as the tank workpiece through an internal elastic collet, the elastic collet is used for high-precision positioning and installation of the plugging rod, the rear cylindrical section of the plugging rod is installed on the elastic collet inside the tool handle, the front side of the plugging rod is a conical surface, and the taper of the plugging rod is the same as the taper of the prefabricated plugging hole of the tank workpiece.

[0026] Preferably, a spring is installed between the main body housing and the workpiece connecting seat installed at its front end, and the elastic collet inside the tool handle at the front end of the central shaft inner cavity can be provided with a rod milling cutter, which includes an initial hole rod milling cutter and a cone angle rod milling cutter.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The temperature control plug for the main head of the launch vehicle tank automatically controls the temperature, pressure and rotation speed of the welding part, solves the problem of poor weld quality after high-speed braking, reduces the heat-affected area of ​​the welding, reduces the residual stress of the weld, reduces the welding deformation, improves the mechanical properties and fatigue strength of the weld, and improves the comprehensive performance of the welded joint; ensures the stability of the friction welding heat input, reduces the difficulty of process control during the welding process, and realizes precise control of the welding process. In this way, the metal crystals in the weld area of ​​the aluminum alloy rocket tank repair welding are uniform, the weld appearance is exquisite, the welding strength is high, the residual welding stress is small, and the welding deformation is small, which ensures the extremely high quality of the stir friction welding weld and improves the technical indicators such as the rocket carrying capacity and the reliability of the rocket system.

[0029] (2) The temperature control plug of the launch vehicle tank is welded to the main head. According to the specific aluminum alloy material of the tank workpiece, the maximum preheating temperature is about ℃. A temperature sensor is fixedly installed at the welding position of the tank workpiece. Through the temperature feedback of the temperature sensor, the preheating, insulation and cooling of the heating plate can be automatically controlled in the control system box.

[0030] (3) The temperature of the launch vehicle tank is controlled by the plug welding main head. The rotating motor controls the position of the central axis (i.e., under the tension state) so that the tension reaches the preset control value and stops. The rotating motor is controlled to achieve the friction between the plugging rod and the prefabricated plugging hole of the tank workpiece. By controlling the plugging rod to rotate and start, maintain at high speed, reduce braking, etc., and through feedback control of temperature and tension, the welding process is fully automated.

[0031] (4) The temperature control plug welding main head of the launch vehicle tank ensures that the welding parts are fully tightened and uniform before and during welding, and ensures the precise control of the friction distance between the initial hole of the tank workpiece and the plugging rod, thereby achieving precise control of parameters related to the plugging rod rotation speed, welding temperature, etc.

[0032] (5) The temperature control plug of the launch vehicle tank is used to repair the main head. Before and during welding, the control system box automatically controls the temperature of the welding part by preheating and keeping the heating plate warm, thereby reducing the welding heat affected area, reducing the residual stress of the weld, reducing the welding deformation, improving the mechanical properties and fatigue strength of the weld, and improving the comprehensive performance of the welded joint; at the same time, it ensures the stability of the heat input of friction welding, reduces the difficulty of process control during the welding process, and is conducive to the precise control of welding parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0034] Figure 1 This is a schematic diagram of a main engine head of a carrier rocket tank temperature control plug repair welding according to the present invention;

[0035] Figure 2 It is a schematic diagram of a water pipe of the present invention;

[0036] Figure 3 This is a schematic diagram of the tension and compression housing of the present invention;

[0037] Figure 4 It is a schematic diagram of the intermediate shell of the present invention;

[0038] Figure 5 It is a schematic diagram of the rotating electrical machine of the present invention;

[0039] Figure 6 This is a schematic diagram of the front bearing of the connecting shaft of the present invention;

[0040] Figure 7 It is a schematic diagram of the initial hole rod milling cutter of the present invention;

[0041] Figure 8 It is a schematic diagram of the cone angle rod milling cutter of the present invention.

[0042] Figure numerals: 1, mainframe housing; 2, connecting shaft; 3, front bearing of connecting shaft; 4, rear bearing of connecting shaft; 5, central shaft; 6, rear bearing of central shaft; 7, tension and compression bearing seat; 8, tension and compression shaft; 9, rotating motor; 10, rotation speed sensor; 11, tension and compression housing; 12, tension and compression speed sensor; 13, tension and compression motor; 14, first nut; 15, first nut bearing; 16, force sensor; 17, tension and compression anti-rotation seat; 18, mainframe rear cover; 19, sliding key; 20, Tool handle; 21. Elastic collet; 22. Plug rod; 23. Workpiece connecting seat; 24. Heating plate; 25. Insulation block; 26. Temperature sensor; 27. Rear bearing seat of center shaft; 28. Storage tank workpiece; 29. ​​Distance sensor; 30. Connector; 31. Water pipe; 32. Front shell; 33. Intermediate shell; 34. Tie rod shaft; 35. Second nut; 36. Tool handle key; 37. Control system box; 38. Water cooler; 39. Initial hole rod milling cutter; 40. Cone angle rod milling cutter. DETAILED DESCRIPTION

[0043] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0044] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are 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, and do not indicate or imply 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 a limitation on the present invention.

[0045] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] See also Figure 1-8The present invention provides a technical solution: a main engine head of a carrier rocket tank temperature control plug repair welding, comprising a main engine shell 1 and a control system box 37, the rear end surface of the main engine shell 1 is fixedly connected with an intermediate shell 33, the rear end of the intermediate shell 33 is fixedly connected with a tension and compression shell 11, the outer surface of the main engine shell 1 is provided with a water cooling device, the water cooling device comprises two connectors 30, the two connectors 30 are fixedly connected to the outer surface of the main engine shell 1, the outer surfaces of the two connectors 30 are fixedly connected with water pipes 31, the ends of the two water pipes 31 away from the connectors 30 are fixedly connected with a water cooler 38, the water cooler 38 performs circulating water flow, one of the two connectors 30 is a water inlet, and the other is a water outlet;

[0048] Among them, the outer surface of the tension and compression housing 11 is provided with the same water cooling device;

[0049] Among them, the inside of the main engine housing 1 is fixedly connected with a rotating motor 9, and a certain gap is formed near the position of the rotating motor 9 near the connector 30 to form a cooling water channel, which is convenient for water from the water cooler 38 to enter the cooling water channel between the main engine housing 1 and the rotating motor 9 for water circulation. The front end of the main engine housing 1 is fixedly connected with a front side housing 32, and a connecting shaft front bearing 3 is arranged inside the main engine housing 1. The outer ring of the connecting shaft front bearing 3 is fixedly connected to the main engine housing 1, the stator of the rotating motor 9 is fixedly connected to the main engine housing 1, and the rotor of the rotating motor 9 is fixedly connected with the connecting shaft 2. The inner ring of the connecting shaft front bearing 3 is fixedly connected to the connecting shaft 2, and the front side housing 32 is used to tighten the connecting shaft front bearing 3 to prevent the connecting shaft front bearing 3 from shifting after rotation;

[0050] The control system box 37 is a control box, and the electrical components inside are of existing structure, which can control the temperature of the water cooler 38;

[0051] Among them, the interior of the intermediate shell 33 is fixedly connected to the connecting shaft rear bearing 4, the inner ring of the connecting shaft rear bearing 4 is fixedly connected to the center shaft 5, the front end outer surface of the center shaft 5 is provided with an external spline structure, the interior of the connecting shaft 2 is hollow, and the interior of the connecting shaft 2 is provided with an internal spline structure. The center shaft 5 and the connecting shaft 2 are connected through the spline structure, and the spline structure transmits the rotational torque. The rear end outer surface of the connecting shaft 2 is provided with a rotation speed sensor 10, and the control system box 37 can read the data of the rotation speed sensor 10 to control the speed.

[0052] Furthermore, a tension-compression motor 13 is fixedly connected to the interior of the tension-compression housing 11, and the stator of the tension-compression motor 13 is fixedly connected to the tension-compression housing 11. A first nut bearing 15 is fixedly connected to the interior of the tension-compression housing 11, and the inner ring of the first nut bearing 15 is fixedly connected to the first nut 14. The first nut bearing 15 is located at the front and rear ends of the first nut 14, and the middle part of the outer side of the first nut 14 is fixedly connected to the rotor of the tension-compression motor 13. The inner cavity of the first nut 14 is threadedly connected to the tension-compression shaft 8. The inner cavity of the first nut 14 and the tension-compression shaft 8 adopt trapezoidal thread transmission to realize the tension-compression bidirectional movement of the tension-compression shaft 8 in the inner cavity of the first nut 14.

[0053] The rear end of the first nut 14 is fixedly connected to a tension-compression anti-rotation seat 17, and the rear end of the tension-compression anti-rotation seat 17 is fixedly connected to a main engine rear cover 18. A sliding key 19 is provided inside the main engine rear cover 18. The tension-compression anti-rotation seat 17 cooperates with the axial hole of the main engine rear cover 18, and together with the sliding key 19, the first nut 14, the tension-compression shaft 8 and the tension-compression anti-rotation seat 17 are prevented from rotating.

[0054] A distance measuring sensor 29 is fixedly installed inside the rear cover 18 of the main machine. The control system box 37 can read and control the rotation speed through the distance measuring sensor 29, and can accurately measure the tension and compression movement position control. A tension and compression rotation speed sensor 12 is fixedly installed on the outer side of the rear end of the first nut 14. The control system box 37 can read the tension and compression values ​​according to the tension and compression rotation speed sensor 12, and realize accurate compensation control of the tension and compression movement position, thereby achieving high precision and high consistency of the welding process.

[0055] A center shaft rear bearing seat 27 is arranged inside the tension and compression shaft 8, and a center shaft rear bearing 6 is fixedly connected inside the center shaft rear bearing seat 27. The inner ring of the center shaft rear bearing 6 is fixedly connected to the center shaft 5. A force sensor 16 is fixedly connected to the rear end of the center shaft rear bearing seat 27. The rear side of the force sensor 16 is installed on the inner cavity end face of the tension and compression anti-rotation seat 17. The force sensor 16 can measure the tension and pressure of the center shaft 5. The related structure of the tension and compression bearing seat 7 and the force sensor 16 can slide on the tension and compression shaft 8 and the tension and compression anti-rotation seat 17 to ensure the force measurement accuracy.

[0056] Furthermore, the center shaft 5 is a hollow structure, and the outer shaft hole at the front end of the center shaft 5 cooperates with the rear bearing 6 of the center shaft to realize the center positioning of the center shaft 5; the front end of the inner cavity of the center shaft 5 is a standard tapered hole, and the front end position of the center shaft 5 is threadedly connected with a tool handle key 36, and the tool handle key 36 can be replaced. The internal thread of the center shaft 5 is connected with a second nut 35, and the second nut 35 is fixedly connected to the pull rod shaft 34. The pull rod shaft 34 is installed in the inner cavity of the center shaft 5 for pulling and pressing bidirectional movement of the center shaft 5.

[0057] Furthermore, a tool handle 20 is fixedly installed at the front end of the inner cavity of the central axis 5 through a tool handle key 36, and the tool handle 20 is installed by using two tool handle keys 36. A plugging rod 22 is arranged inside the tool handle 20, and an elastic collet 21 is installed inside the tool handle 20. A tank workpiece 28 is arranged on the front outer end face of the workpiece connecting seat 23, and the front outer end face of the workpiece connecting seat 23 supports the tank workpiece 28. An annular heat insulation block 25 and a heating plate 24 are fixedly installed on the front inner end face of the workpiece connecting seat 23 in sequence. The heating plate 24 realizes preheating of the welding part of the tank workpiece 28. According to the specific aluminum alloy material of the tank workpiece 28, the maximum preheating temperature is about 580°C. A temperature sensor 26 is fixedly installed at the welding part of the tank workpiece 28. Through the temperature measurement feedback of the temperature sensor 26, the preheating, insulation and cooling of the heating plate 24 can be automatically controlled in the control system box 37.

[0058] Furthermore, the tool handle 20 holds a plugging rod 22 made of the same material as the tank workpiece 28 through an internal elastic collet 21. The elastic collet 21 is used for high-precision positioning and installation of the plugging rod 22. The rear cylindrical section of the plugging rod 22 is installed on the elastic collet 21 inside the tool handle 20. The front side of the plugging rod 22 is a conical surface. The taper of the plugging rod 22 is the same as the taper of the prefabricated plugging hole of the tank workpiece 28.

[0059] The rotating motor 9 controls the position of the central axis 5 (i.e., under the tension state) so that the tension reaches a preset control value and then stops. The rotating motor 9 is controlled to realize the friction between the plugging rod 22 and the prefabricated plugging hole of the tank workpiece 28. By controlling the plugging rod 22 to rotate and start, maintain at high speed, reduce braking, and other processes, and through feedback control of temperature and tension, the welding process is fully automated.

[0060] Furthermore, a spring is installed between the main body housing 1 and the workpiece connecting seat 23 at its front end to ensure that the welding part is fully tightened and tightened uniformly before and during welding, to ensure accurate control of the friction distance between the initial hole of the tank workpiece 28 and the plugging rod 22, and to achieve accurate control of parameters related to the plugging rod 22 rotation speed, welding temperature and so on.

[0061] Furthermore, the elastic collet 21 inside the tool handle 20 at the front end of the inner cavity of the central axis 5 can be provided with a rod milling cutter (the rod milling cutter includes an initial hole rod milling cutter 39 and a tapered angle rod milling cutter 40), and the control system box 37 controls the pressure (i.e., the pressure state) through the force sensor 16 feedback, which is used for high-precision milling control of the initial hole of the tank workpiece 28 to ensure high-precision matching between the plugging rod 22 and the conical surface of the initial hole of the tank workpiece 28.

[0062] Furthermore, when the device is used, before and during welding, the control system box 37 automatically controls the temperature of the welding part by preheating and keeping the heating plate 24 warm, thereby reducing the welding heat affected area, reducing the residual stress of the weld, reducing the welding deformation, improving the mechanical properties and fatigue strength of the weld, and improving the comprehensive performance of the welded joint; at the same time, the stability of the friction welding heat input is ensured, the difficulty of the welding process control is reduced, and it is conducive to the precise control of the welding parameters;

[0063] Before and during welding, the control system box 37 controls the friction distance between the initial hole of the tank workpiece 28 and the plugging rod 22 through feedback from the force sensor 16, thereby achieving precise control of parameters related to the plugging rod 22 rotation speed, welding temperature, etc.

[0064] Furthermore, the present invention solves the problem of poor weld quality after high-speed braking by automatically controlling the temperature, pressure and rotation speed of the welding part, reduces the welding heat affected area, reduces the residual stress of the weld, reduces welding deformation, improves the mechanical properties and fatigue strength of the weld, and improves the comprehensive performance of the welded joint; ensures the stability of the heat input of friction welding, reduces the difficulty of process control during the welding process, and realizes precise control of the welding process, thereby ensuring that the metal crystals in the weld area of ​​the aluminum alloy rocket tank repair welding are uniform, the weld has a beautiful appearance, the welding strength is high, the residual welding stress is small, and the welding deformation is small, thereby ensuring the extremely high quality of the stir friction welding weld and improving technical indicators such as the rocket carrying capacity and the reliability of the rocket system.

[0065] Embodiment 1:

[0066] In this embodiment, the tool handle 20 fixes and clamps the initial hole rod milling cutter 39 through the internal elastic collet 21.

[0067] The control system box 37 controls the pull-press motor 13 to move in the reverse direction (pull), and the control system box 37 accurately controls the center shaft 5 to move to the zero position through the distance sensor 29. The tool handle 20 (including the elastic collet 21 installed inside) at the front end of the inner cavity of the center shaft 5 is installed with the initial hole rod milling cutter 39, and the control system box 37 controls the pull-press motor 13 to move in the forward direction (press), and controls the rotary motor 9 to realize the rotation of the initial hole rod milling cutter 39, so as to complete the initial hole making by plug welding; Figure 7 shown.

[0068] Embodiment 2:

[0069] In this embodiment, the tool handle 20 is fixedly clamped by the elastic collet 21 inside the tool handle 20 to clamp the cone angle rod milling cutter 40, and the control system box 37 controls the tension and pressure motor 13 to move forward (press) to the maximum position and then brake to stop, and the tool handle 20 (including the elastic collet 21 installed inside) at the front end of the inner cavity of the central shaft 5 is installed with the cone angle rod milling cutter 40, and the control system box 37 controls the tension and pressure motor 13 to move in the reverse (pull) direction and controls the rotary motor 9 to realize the rotation of the initial hole rod milling cutter 39, so as to complete the taper processing of the initial hole of the plug repair welding, and the taper of the front side conical surface of the plug repair rod 22 is the same as the taper of the prefabricated plug repair hole; Figure 8 shown.

[0070] Embodiment three:

[0071] In this embodiment, the control system box 37 controls the tension and compression motor 13 to move forward (compressively) to the maximum position and then brake to stop. The tool handle 20 (including the elastic collet 21 installed inside) at the front end of the inner cavity of the central shaft 5 is installed with a plugging rod 22; the front end of the front shell 32 is installed with a workpiece connecting seat 23, the front outer end surface of the workpiece connecting seat 23 supports the storage tank workpiece 28, and the front inner end surface is installed with an annular heat insulation block 25, a heating plate 24, and a temperature sensor 26; the control system box 37 controls the heating plate 24 to complete the preheating of the welding part of the storage tank workpiece 28, according to the storage tank. The specific aluminum alloy material of the tank workpiece 28 is different, and the maximum preheating temperature is about 580°C; the control system box 37 automatically controls the preheating, heat preservation, and cooling of the heating plate 24 through the temperature measurement feedback of the temperature sensor 26; the control system box 37 controls the reverse (pulling) movement of the tension and pressure motor 13 and controls the rotation motor 9 to realize the rotation of the plugging rod 22. The control system box 37 automatically controls the temperature, displacement, tension and pressure of the welding part, the speed and braking of the plugging rod to complete the plugging welding of the tank workpiece 28 and the plugging rod 22; Figure 6 shown.

[0072] In summary, the present invention provides a main head of a carrier rocket tank temperature control plug for welding. The present invention solves the problem of poor weld quality after high-speed braking by automatically controlling the temperature, pressure and rotation speed of the welding part, reduces the welding heat-affected area, reduces the residual stress of the weld, reduces the welding deformation, improves the mechanical properties and fatigue strength of the weld, and improves the comprehensive performance of the welded joint; ensures the stability of the friction welding heat input, reduces the difficulty of process control during the welding process, and realizes precise control of the welding process, thereby ensuring that the metal crystals in the weld area of ​​the aluminum alloy rocket tank repair welding are uniform, the weld has a beautiful appearance, high welding strength, small residual welding stress, and small welding deformation, ensuring the extremely high quality of the stir friction welding weld, and improving the technical indicators such as the rocket carrying capacity and the reliability of the rocket system. Therefore, the present invention has a wide range of application prospects.

[0073] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A main head of a launch vehicle tank temperature control plug repair welding, characterized in that: It comprises a mainframe housing (1) and a control system box (37), the rear end surface of the mainframe housing (1) is fixedly connected to an intermediate housing (33), the rear end of the intermediate housing (33) is fixedly connected to a tension and compression housing (11), the outer surface of the mainframe housing (1) is provided with a water cooling device, the water cooling device comprises two connectors (30), the two connectors (30) are fixedly connected to the outer surface of the mainframe housing (1), the outer surfaces of the two connectors (30) are both fixedly connected to water pipes (31), the ends of the two water pipes (31) away from the connectors (30) are fixedly connected to a water cooler (38), the water cooler (38) performs a circulating water flow, one of the two connectors (30) is a water inlet, and the other is a water outlet; Wherein, the outer surface of the tension and compression housing (11) is provided with a similar water cooling device; The main engine housing (1) is fixedly connected to a rotating motor (9) inside. A certain gap is formed near the connecting head (30) of the rotating motor (9) to form a cooling water channel, so that water from a water cooler (38) can enter the cooling water channel between the main engine housing (1) and the rotating motor (9) for water circulation. The front end of the main engine housing (1) is fixedly connected to a front shell (32). A connecting shaft front bearing (3) is arranged inside the main engine housing (1). The outer ring of the connecting shaft front bearing (3) is fixedly connected to the main engine housing (1). The stator of the rotating motor (9) is fixedly connected to the main engine housing (1). The rotor of the rotating motor (9) is fixedly connected to a connecting shaft (2). The inner ring of the connecting shaft front bearing (3) is fixedly connected to the connecting shaft (2). The front shell (32) is used to tighten the connecting shaft front bearing (3) to prevent the connecting shaft front bearing (3) from shifting after rotation.

2. A carrier rocket tank temperature control plug repair welding main head according to claim 1, characterized in that: The control system box (37) is a control box, and the electrical components inside are of existing structure, which can control the temperature of the water cooler (38); The interior of the intermediate housing (33) is fixedly connected to a connecting shaft rear bearing (4), the inner ring of the connecting shaft rear bearing (4) is fixedly connected to a center shaft (5), the front end outer surface of the center shaft (5) is provided with an external spline structure, the interior of the connecting shaft (2) is hollow, the interior of the connecting shaft (2) is provided with an internal spline structure, the center shaft (5) and the connecting shaft (2) are connected via a spline structure, the spline structure cooperates to transmit the rotational torque, the rear end outer surface of the connecting shaft (2) is provided with a rotation speed sensor (10), and the control system box (37) can read the data of the rotation speed sensor (10) to control the rotation speed.

3. A carrier rocket tank temperature control plug repair welding main head according to claim 2, characterized in that: The interior of the tension-compression housing (11) is fixedly connected to a tension-compression motor (13), the stator of the tension-compression motor (13) is fixedly connected to the tension-compression housing (11), the interior of the tension-compression housing (11) is fixedly connected to a first nut bearing (15), the inner ring of the first nut bearing (15) is fixedly connected to a first nut (14), the first nut bearing (15) is located at the front and rear ends of the first nut (14), the outer middle part of the first nut (14) is fixedly connected to the rotor of the tension-compression motor (13), the inner cavity of the first nut (14) is threadedly connected to a tension-compression shaft (8), the inner cavity of the first nut (14) and the tension-compression shaft (8) adopt trapezoidal thread transmission to realize the tension-compression shaft (8) in the inner cavity of the first nut (14) The bidirectional movement of tension and compression.

4. A carrier rocket tank temperature control plug repair welding main head according to claim 3, characterized in that: The rear end of the first nut (14) is fixedly connected to a tension and compression anti-rotation seat (17), and the rear end of the tension and compression anti-rotation seat (17) is fixedly connected to a mainframe rear cover (18). A sliding key (19) is arranged inside the mainframe rear cover (18). The tension and compression anti-rotation seat (17) cooperates with the shaft hole of the mainframe rear cover (18) and cooperates with the sliding key (19) to realize anti-rotation of the first nut (14), the tension and compression shaft (8) and the tension and compression anti-rotation seat (17).

5. A carrier rocket tank temperature control plug repair welding main head according to claim 4, characterized in that: A distance sensor (29) is fixedly installed inside the main engine rear cover (18), and the control system box (37) can read and control the rotation speed through the distance sensor (29), and can accurately measure the tension and compression movement position control. A tension and compression rotation speed sensor (12) is fixedly installed on the outer side of the rear end of the first nut (14); A central shaft rear bearing seat (27) is arranged inside the tension and compression shaft (8), a central shaft rear bearing (6) is fixedly connected inside the central shaft rear bearing seat (27), an inner ring of the central shaft rear bearing (6) is fixedly connected to the central shaft (5), and a force sensor (16) is fixedly connected to the rear end of the central shaft rear bearing seat (27).

6. A carrier rocket tank temperature control plug repair welding main head according to claim 5, characterized in that: The rear side of the force sensor (16) is installed on the inner cavity end surface of the tension and compression anti-rotation seat (17). The force sensor (16) can measure the tension and pressure of the central shaft (5). The related structure of the tension and compression bearing seat (7) and the force sensor (16) can slide on the tension and compression shaft (8) and the tension and compression anti-rotation seat (17) to ensure the force measurement accuracy.

7. A carrier rocket tank temperature control plug repair welding main head according to claim 6, characterized in that: The central shaft (5) is a hollow structure, and the outer shaft hole at the front end of the central shaft (5) cooperates with the rear bearing (6) of the central shaft to realize the center positioning of the central shaft (5); The front end of the inner cavity of the center shaft (5) is a standard tapered hole, and the front end of the center shaft (5) is threadedly connected with a handle key (36), which can be replaced. The inner thread of the center shaft (5) is connected with a second nut (35), and the second nut (35) is fixedly connected to the pull rod shaft (34). The pull rod shaft (34) is installed in the inner cavity of the center shaft (5) for the center shaft (5) to move in both directions of tension and compression.

8. A carrier rocket tank temperature control plug repair welding main head according to claim 7, characterized in that: A tool handle (20) is fixedly mounted on the front end of the inner cavity of the central shaft (5) via a tool handle key (36). The tool handle (20) is mounted using (2) tool handle keys (36). A plugging rod (22) is arranged inside the tool handle (20). An elastic collet (21) is installed inside the tool handle (20). A storage tank workpiece (28) is arranged on the front outer end surface of the workpiece connecting seat (23). The front outer end surface of the workpiece connecting seat (23) supports the storage tank workpiece (28). An annular heat insulation block (25) and a heating plate (24) are fixedly mounted on the front inner end surface of the workpiece connecting seat (23) in sequence. The heating plate (24) realizes preheating of the welding portion of the storage tank workpiece (28). A temperature sensor (26) is fixedly mounted at the welding portion of the storage tank workpiece (28).

9. A carrier rocket tank temperature control plug repair welding main head according to claim 8, characterized in that: The tool handle (20) is fixedly clamped by an elastic collet (21) inside to hold a plugging rod (22) made of the same material as the tank workpiece (28). The elastic collet (21) is used for high-precision positioning and installation of the plugging rod (22). The rear cylindrical section of the plugging rod (22) is installed on the elastic collet (21) inside the tool handle (20). The front side of the plugging rod (22) is a conical surface. The taper of the plugging rod (22) is the same as the taper of the prefabricated plugging hole of the tank workpiece (28).

10. A carrier rocket tank temperature control plug repair welding main head according to claim 9, characterized in that: A spring is installed between the main body housing (1) and a workpiece connecting seat (23) installed at its front end, and a rod milling cutter can be provided in the elastic collet (21) inside the tool handle (20) at the front end of the inner cavity of the central shaft (5). The rod milling cutter includes an initial hole rod milling cutter (39) and a cone angle rod milling cutter (40).

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