Device and method for efficiently and precisely welding end cover on aero-engine mass flow meter

Abstract

The invention discloses a device and a method for efficiently and precisely welding end covers on a mass flow meter of an aero-engine, and relates to the technical field of welding one end cover on a liquid outlet pipe and a liquid inlet pipe of the mass flow meter respectively. The workbench is further provided with a loading mechanism which is located on the left side of the turnover mechanism and used for automatically and continuously loading the end covers to the mass flow meters, and the loading mechanism is provided with a welding mechanism. Horizontal oil cylinders are fixedly arranged on the left end face and the right end face of the supporting seat, dowel bars are fixedly arranged on the inner end faces of the two connecting plates, pressing plates which are inclined outwards are rotationally installed on the left end face and the right end face of the supporting seat through pin shafts, and the outer end faces of the pressing plates abut against the dowel bars under the elastic action of springs. The welding device has the beneficial effects that the welding efficiency of the mass flow meter and the two end covers is greatly improved, and the welding quality of the mass flow meter and the two end covers is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding an end cover respectively on a liquid outlet pipe and a liquid inlet pipe of a mass flow meter, in particular to a device and method for efficiently and accurately welding an end cover on an aircraft engine mass flow meter. Background Art

[0002] A mass flow meter is also called a Coriolis mass flow meter. Its working principle is: when a fluid flows through, the mass flow meter will force the fluid flowing through it to vibrate together, and in order to resist this forced vibration, the fluid will exert a reaction force on the mass flow meter in its flow direction. This force is called the Coriolis force. Under the action of the Coriolis force, the vibration of the flow meter body of the mass flow meter is out of sync, and a difference occurs. The size of the difference can be detected by the circuit, and this difference is proportional to the mass flow rate of the fluid, thereby measuring the mass flow rate of the fluid.

[0003] The structure of a mass flow meter is as follows: Figure 1~Figure 2 As shown, the mass flow meter includes a flow meter body 1, the left and right ends of the flow meter body 1 are connected to a liquid outlet pipe 2 and a liquid inlet pipe 3, respectively, and shoulders 4 are provided on the cylindrical surfaces of the liquid outlet pipe 2 and the liquid inlet pipe 3. The process requires welding a Figure 3~Figure 4 The end cap 6 with the central hole 5 is shown, thereby obtaining a desired product, and the product is connected to the pipeline through the end cap 6 thereon.

[0004] The method for welding an end cover 6 on the liquid outlet pipe 2 and the liquid inlet pipe 3 of the mass flow meter in the workshop is: S1. A worker takes out a mass flow meter and fixes the flow meter body 1 of the mass flow meter with a fixture; S2. The worker puts an end cover 6 on the liquid outlet pipe 2 and the liquid inlet pipe 3 of the mass flow meter, and the worker presses the end cover 6 against the shoulder 4 by hand. Figure 5 As shown, at this time, an annular gap is formed between the inner wall of the left end cover 6 and the outer wall of the liquid outlet pipe 2, and an annular gap is formed between the inner wall of the right end cover 6 and the outer wall of the liquid inlet pipe 3; S3, welding the annular gap by the laser head of the laser welding machine to form an annular weld scar between the left end cover 6 and the liquid outlet pipe 2 and between the right end cover 6 and the liquid inlet pipe 3, thereby achieving welding of one end cover 6 on each mass flow meter, thereby producing the desired product; S4. The worker repeats the operations of steps S1 to S3 for multiple times, and can continuously weld two end covers 6 on multiple mass flow meters, thereby producing multiple required products.

[0005] However, although the method in the workshop can weld an end cover 6 on both the liquid outlet pipe 2 and the liquid inlet pipe 3 of the mass flow meter, the following technical defects still exist in actual operation: I. In step S2, workers need to manually put the two end covers 6 on the liquid outlet pipe 2 and the liquid inlet pipe 3 of the mass flow meter, and also manually put the end covers 6 against the shoulder 4 before proceeding with the subsequent welding process. The entire installation of the end covers 6 is done manually, which not only increases the work intensity of the workers, but also increases the installation time of the end covers 6, thereby reducing the welding efficiency of the mass flow meter and the two end covers 6.

[0006] II. In step S3, when the laser head of the laser welding machine is welding the annular gap, a gap appears between the end cover 6 and the shoulder 4 under the welding force, and the process requires that the end cover 6 and the shoulder 4 are tightly fitted after welding, thereby reducing the welding quality between the mass flow meter and the two end covers 6.

[0007] Therefore, there is an urgent need for a welding device and method that can greatly improve the welding efficiency and quality of the mass flow meter and the two end covers. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a device and method for efficiently and accurately welding end covers on an aircraft engine mass flow meter, which greatly improves the welding efficiency and quality of the mass flow meter and the two end covers.

[0009] The object of the present invention is achieved by the following technical solutions: A device for efficiently and accurately welding end covers on a mass flow meter of an aircraft engine, comprising a workbench, a turnover mechanism for tooling and conveying the mass flow meter is provided on the workbench, an upper installation mechanism located on the left side of the turnover mechanism and used for automatically and continuously loading the end cover on the mass flow meter is also provided on the workbench, and a welding mechanism is provided on the upper installation mechanism; The turnover mechanism includes a stepper motor fixedly mounted on the bottom surface of the workbench, a main shaft fixedly connected to the output shaft of the stepper motor, the main shaft passes through the workbench upwards and a turntable is installed on the extended end, lifting cylinders are fixedly mounted on the bottom surfaces of the left and right ends of the turntable, the piston rod of the lifting cylinder on the left side passes through the turntable upwards, and a frame is fixedly mounted on the extended end, a servo motor is fixedly mounted in the frame, the output shaft of the servo motor passes through the top wall of the frame upwards, and a support seat is fixedly mounted on the extended end, a positioning groove is opened on the top surface of the support seat, and the positioning groove matches the outer contour of the flowmeter body of the mass flowmeter; Horizontal oil cylinders are fixedly arranged on the left and right end surfaces of the support seat, connecting plates are fixedly arranged on the active ends of the piston rods of the two horizontal oil cylinders, force transmission rods are fixedly arranged on the inner end surfaces of the two connecting plates, and pressure plates inclined outward are rotatably installed on the left and right end surfaces of the support seat via the pins, a spring is fixedly arranged between the pressure plate and the support seat, and under the elastic force of the spring, the outer end surface of the pressure plate rests on the force transmission rod.

[0010] The upper mounting mechanism includes a vertical plate fixedly mounted on the workbench surface, a bracket fixedly mounted on the right end surface of the vertical plate, and a stepped shaft fixedly mounted on the outer end surface of the bracket. An upper mounting cylinder is fixedly mounted on the left end surface of the bracket and directly above the stepped shaft. The piston rod of the upper mounting cylinder penetrates the bracket to the right, and a lifting cylinder is fixedly mounted on the extending end. A clamping cylinder is fixedly mounted on the active end of the piston rod of the lifting cylinder, and the chuck on the clamping cylinder is located directly above the small shaft of the stepped shaft.

[0011] The diameter of the small shaft of the stepped shaft is equal to the diameter of the central hole of the end cover.

[0012] The welding mechanism includes a horizontal plate fixedly arranged at the top end of the vertical plate, the horizontal plate extends to the right just above the turnover mechanism, and a driving motor is fixedly arranged on the bottom surface of the extended end, a rotating plate is connected to the output shaft of the driving motor, a laser welding head is fixedly arranged at the top end of the rotating plate, and the laser welding head is connected to the laser welding machine.

[0013] The two lifting cylinders of the turnover mechanism are arranged symmetrically about the main axis.

[0014] A plurality of supporting legs supported on the ground are fixedly arranged on the bottom surface of the workbench.

[0015] The device also includes a controller, which is electrically connected to the stepping motor, the servo motor, the driving motor, the upper loading cylinder, the lifting cylinder, the jacking cylinder and the clamping cylinder via a signal line.

[0016] A method for efficiently and accurately welding an end cover on an aircraft engine mass flow meter comprises the following steps: S1. The worker takes out a plurality of end caps and sequentially sets them on the small shaft of the stepped shaft of the upper mounting mechanism from left to right, and ensures that the leftmost end cap abuts against the step surface of the stepped shaft. At this time, the rightmost end cap on the stepped shaft is just below the chuck of the upper mounting mechanism; S2. The worker takes out a mass flow meter and inserts the flow meter body of the mass flow meter into the positioning groove of the support seat on the left side of the turnover mechanism from top to bottom. Since the positioning groove matches the outer contour of the flow meter body of the mass flow meter, the mass flow meter is positioned. At this time, the liquid outlet pipe of the mass flow meter is just opposite to the small axis of the stepped shaft of the upper mounting mechanism. S3. Install the rightmost end cover on the stepped shaft onto the liquid outlet pipe of the mass flow meter. The specific steps are as follows: S31, the piston rod of the lifting cylinder of the upper loading mechanism is extended downward, the piston rod drives the clamping cylinder and the chuck to move downward, and the chuck moves toward the rightmost end cover on the stepped shaft. When the piston rod of the lifting cylinder is fully extended, the chuck just fits on the outside of the rightmost end cover on the stepped shaft; S32, control the clamping oil cylinder to start, the clamping oil cylinder drives the clamping head to close, and the clamping head clamps and fixes the rightmost end cover on the stepped shaft; S33, control the piston rod of the upper loading cylinder of the upper loading mechanism to extend to the right, the piston rod drives the lifting cylinder, the clamping cylinder and the end cover clamped in the chuck to move to the right, the end cover is separated from the stepped shaft and moves toward the liquid outlet pipe of the mass flow meter; when the piston rod of the upper loading cylinder is fully extended, the end cover is just sleeved on the liquid outlet pipe of the mass flow meter and rests on the shoulder of the liquid outlet pipe; S34, control the clamping oil cylinder to close, and separate the chuck from the end cover; then control the piston rods of the lifting oil cylinder and the upper oil cylinder to retract, so that the chuck of the clamping oil cylinder moves to the second end cover on the stepped shaft, thereby finally achieving the installation of the rightmost end cover on the stepped shaft onto the liquid outlet pipe of the mass flow meter; S4, control the servo motor on the left side of the turnover mechanism to start, the servo motor drives the support seat to rotate around its own axis, and the support seat drives the mass flow meter to rotate synchronously. When the mass flow meter rotates 180°, the liquid inlet pipe of the mass flow meter faces the upper installation station of the upper installation mechanism; the worker repeats the operation of step S3 to realize the installation of the end cover on the stepped shaft onto the liquid inlet pipe of the mass flow meter; S5. Fixing of the two end covers on the mass flow meter: The piston rods of the two horizontal oil cylinders of the control turnover mechanism are retracted, and the piston rods drive the connecting plate to move toward the support seat, and the connecting plate drives the force transmission rod to move toward the support seat. At the same time, the force transmission rod pushes the pressure plate to rotate around the axis of the pin toward the support seat. When the piston rod of the horizontal oil cylinder is fully retracted, the pressure plate on the left side compresses the spring and presses and fixes the end cover on the liquid inlet pipe on the shoulder of the liquid inlet pipe. At the same time, the pressure plate on the right side compresses the spring and presses and fixes the end cover on the liquid outlet pipe on the shoulder of the liquid outlet pipe, thereby finally realizing the fixing of the two end covers on the mass flow meter; S6, the stepper motor controlling the turnover mechanism is started, the stepper motor drives the main shaft to rotate, the main shaft drives the turntable to rotate, the turntable drives the lifting cylinder, the support seat and the mass flow meter to rotate synchronously, when the mass flow meter rotates 180°, the controller controls the stepper motor to turn off, and the mass flow meter moves to the bottom of the welding mechanism; S7. The specific steps for welding the liquid inlet pipe of the mass flow meter to its upper end cover are as follows: S71. The piston rod of the lifting cylinder of the control turnover mechanism extends upward, and the piston rod drives the frame, the servo motor, the support seat and the mass flow meter to move upward synchronously. When the piston rod of the lifting cylinder is fully extended, the annular gap formed between the liquid inlet pipe and the end cover of the mass flow meter is just facing the laser welding head of the welding mechanism; S72, turning on the laser welding machine, emitting a laser beam from the laser welding head, and irradiating the annular gap between the liquid inlet pipe and the end cover, so that the liquid inlet pipe and the end cover begin to be welded together; S73, control the driving motor of the welding mechanism to start, the driving motor drives the rotating plate to rotate, and the rotating plate drives the laser welding head to rotate. When the laser welding head rotates 180°, the liquid inlet pipe and the end cover of the mass flow meter can be welded together; S8. The specific steps for welding the liquid outlet pipe of the mass flow meter to its upper end cover are as follows: S81, control the piston rod of the lifting cylinder to retract downward to separate the mass flow meter from the laser welding head; then control the servo motor to start, the servo motor support seat rotates, and the support seat drives the mass flow meter to rotate synchronously. When the servo motor rotates 180°, the controller controls the servo motor to turn off; S82, the piston rod of the lifting cylinder of the control turnover mechanism extends upward, and the piston rod drives the frame, the servo motor, the support seat and the mass flow meter to move upward synchronously. When the piston rod of the lifting cylinder is fully extended, the annular gap formed between the liquid outlet pipe of the mass flow meter and the end cover is just facing the laser welding head of the welding mechanism; S83, repeating the operations of S72 to S73, the liquid outlet pipe of the mass flow meter and the end cover can be welded together, thereby finally achieving the welding of two end covers on the mass flow meter, and then producing the required product; S9. Removal of products: Control the piston rod of the lifting cylinder to retract downward, and then control the piston rods of the two horizontal cylinders on the support seat to extend outward. The piston rod drives the connecting plate to move outward, and the connecting plate drives the force transmission rod to move outward. Under the restoring force of the spring, the pressing plate rotates outward, and the pressing plate is separated from the end cover of the product; after separation, the worker takes the product out of the support seat; S10. The worker repeats the operations of steps S2 to S9 for multiple times, and can continuously weld two end covers on multiple mass flow meters, thereby producing multiple required products.

[0017] The present invention has the following advantages: greatly improving the welding efficiency between the mass flow meter and the two end covers, and greatly improving the welding quality between the mass flow meter and the two end covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a mass flow meter; Figure 2 for Figure 1 Left view of Figure 3 is a schematic diagram of the structure of the end cover; Figure 4 for Figure 3 Left view of Figure 5 It is a schematic diagram of putting an end cover on both the liquid outlet pipe and the liquid inlet pipe of the mass flow meter; Figure 6 It is a structural schematic diagram of the present invention; Figure 7 for Figure 6 The main cross-sectional diagram of Figure 8 This is the axonometric drawing of the epicyclic mechanism; Fig. 9 for Figure 8 Axonometric drawing of the middle support seat; Fig.10 It is a schematic diagram of the connection between the upper mounting mechanism and the welding mechanism; Fig.11 for Fig.10 AA cross-sectional diagram of ; Fig.12 It is a structural schematic diagram of the welding mechanism; Fig.13 It is a schematic diagram of putting a plurality of end covers on the small shaft of the stepped shaft of the upper mounting mechanism in sequence from left to right; Fig.14 for Fig.13 A partial enlarged view of part B; Fig.15 for Fig.14 Schematic diagram of CC cross section; Fig.16 A schematic diagram for realizing the positioning of the mass flow meter; Fig.17 A schematic diagram of a chuck for clamping the oil cylinder being sleeved on the outside of the rightmost end cover on the stepped shaft; Fig.18 for Fig.17 DD cross-sectional diagram; Fig.19 A schematic diagram showing a clamping head for clamping the oil cylinder to clamp and fix the rightmost end cover on the stepped shaft; Fig. 20 It is a schematic diagram of an end cover being mounted on a liquid outlet pipe of a mass flow meter; Fig.21 for Fig. 20 A partial enlarged view of part E; Fig. 22 A schematic diagram of installing the rightmost end cover on the stepped shaft onto the liquid outlet pipe of the mass flow meter; Fig.23It is a schematic diagram of the liquid inlet pipe of the mass flow meter facing the upper loading station of the upper loading mechanism; Fig.24 A schematic diagram of installing the end cover on the stepped shaft onto the liquid inlet pipe of the mass flow meter; Fig.25 A schematic diagram for fixing two end covers on a mass flow meter; Fig.26 for Fig.25 A partial enlarged view of the F part; Fig. 27 It is a schematic diagram of the mass flow meter moving under the welding mechanism; Fig.28 A schematic diagram of the annular gap formed between the liquid inlet pipe and the end cover of the mass flow meter facing the laser welding head; Fig.29 for Fig.28 A partial enlarged view of the M part; In the figure: 1-flow meter body, 2-liquid outlet pipe, 3-liquid inlet pipe, 4-shoulder, 5-center hole, 6-end cover; 7-working table, 8-turnaround mechanism, 9-loading mechanism, 10-welding mechanism, 11-stepping motor, 12-spindle, 13-turntable, 14-lifting cylinder, 15-frame, 16-servo motor, 17-support seat, 18-positioning groove, 19-horizontal cylinder, 20-connecting plate, 21-force transmission rod, 22-pin shaft, 23-pressing plate, 24-spring; 25-vertical plate, 26-bracket, 27-step shaft, 28-upper loading cylinder, 29-lifting cylinder, 30-clamping cylinder, 31-chuck, 32-cross plate, 33-drive motor, 34-rotating plate, 35-laser welding head. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings, and the protection scope of the present invention is not limited to the following: like Figure 6~Figure 12 As shown, a device for efficiently and accurately welding end covers on aircraft engine mass flow meters comprises a workbench 7, on which is disposed a turnover mechanism 8 for tooling and conveying the mass flow meter, and on which is disposed an upper installation mechanism 9 located on the left side of the turnover mechanism 8 and used for automatically and continuously installing end covers 6 on the mass flow meter, and on which is disposed a welding mechanism 10; a plurality of supporting legs supported on the ground are fixedly disposed on the bottom surface of the workbench 7.

[0020] The upper mounting mechanism 9 includes a vertical plate 25 fixedly mounted on the workbench 7, a bracket 26 fixedly mounted on the right end surface of the vertical plate 25, and a stepped shaft 27 fixedly mounted on the outer end surface of the bracket 26. A mounting oil cylinder 28 is fixedly mounted on the left end surface of the bracket 26 and directly above the stepped shaft 27. The piston rod of the mounting oil cylinder 28 penetrates the bracket 26 to the right, and a lifting oil cylinder 29 is fixedly mounted on the extended end. A clamping oil cylinder 30 is fixedly mounted on the active end of the piston rod of the lifting oil cylinder 29. The chuck 31 on the clamping oil cylinder 30 is located directly above the small shaft of the stepped shaft 27. The diameter of the small shaft of the stepped shaft 27 is equal to the diameter of the center hole 5 of the end cover 6.

[0021] The rotating mechanism 8 includes a stepper motor 11 fixedly mounted on the bottom surface of the workbench 7, and a main shaft 12 fixedly connected to the output shaft of the stepper motor 11. The main shaft 12 passes through the workbench 7 upward and a turntable 13 is installed on the extended end. Lifting cylinders 14 are fixedly mounted on the bottom surfaces of the left and right ends of the turntable 13. The piston rod of the lifting cylinder 14 on the left side passes through the turntable 13 upward, and a frame 15 is fixedly mounted on the extended end. A servo motor 16 is fixedly mounted in the frame 15. The output shaft of the servo motor 16 passes through the top wall of the frame 15 upward, and a support seat 17 is fixedly mounted on the extended end. A positioning groove 18 is opened on the top surface of the support seat 17, and the positioning groove 18 matches the outer contour of the flowmeter body 1 of the mass flowmeter; the two lifting cylinders 14 of the rotating mechanism 8 are symmetrically arranged about the main shaft 12.

[0022] Horizontal cylinders 19 are fixedly provided on the left and right end surfaces of the support seat 17, connecting plates 20 are fixedly provided on the active ends of the piston rods of the two horizontal cylinders 19, force transmission rods 21 are fixedly provided on the inner end surfaces of the two connecting plates 20, and pressure plates 23 inclined outwardly are rotatably installed on the left and right end surfaces of the support seat 17 via pins 22, and a spring 24 is fixedly provided between the pressure plate 23 and the support seat 17. Under the elastic force of the spring 24, the outer end surface of the pressure plate 23 abuts against the force transmission rod 21.

[0023] The welding mechanism 10 includes a horizontal plate 32 fixedly mounted on the top end of the vertical plate 25. The horizontal plate 32 extends to the right just above the revolving mechanism 8, and a driving motor 33 is fixedly mounted on the bottom surface of the extended end. A rotating plate 34 is connected to the output shaft of the driving motor 33. A laser welding head 35 is fixedly mounted on the top end of the rotating plate 34, and the laser welding head 35 is connected to a laser welding machine.

[0024] The device also includes a controller, which is electrically connected to the stepper motor 11, the servo motor 16, the drive motor 33, the upper loading cylinder 28, the lifting cylinder 29, the jacking cylinder 14 and the clamping cylinder 30 via a signal line. Workers can control the start or stop of the stepper motor 11, the servo motor 16 and the drive motor 33 through the controller, and can also control the extension or retraction of the piston rods of the upper loading cylinder 28, the lifting cylinder 29 and the jacking cylinder 14, thereby facilitating the workers' operation and having the characteristics of a high degree of automation.

[0025] A method for efficiently and accurately welding an end cover on an aircraft engine mass flow meter comprises the following steps: S1, workers take out multiple Figure 3~Figure 4 The end caps 6 shown in the figure are sequentially mounted on the small shaft of the stepped shaft 27 of the upper mounting mechanism 9 from left to right, as shown in FIG. Figure 13~Figure 15 As shown, and ensure that the leftmost end cover 6 abuts against the step surface of the stepped shaft 27, at this time, the rightmost end cover 6 on the stepped shaft 27 is just below the clamping head 31 of the upper mounting mechanism 9; S2, the worker takes out a Figure 1~Figure 2 The mass flow meter shown in the figure has the flow meter body 1 of the mass flow meter embedded from top to bottom into the positioning groove 18 of the support seat 17 on the left side of the turnover mechanism 8. Since the positioning groove 18 matches the outer contour of the flow meter body 1 of the mass flow meter, the mass flow meter is positioned. Fig.16 As shown, at this time, the liquid outlet pipe 2 of the mass flow meter is just opposite to the small axis of the stepped shaft 27 of the upper mounting mechanism 9; S3, install the rightmost end cover 6 on the stepped shaft 27 onto the liquid outlet pipe 2 of the mass flow meter, and the specific operation steps are as follows: S31, control the piston rod of the lifting cylinder 29 of the upper mounting mechanism 9 to extend downward, the piston rod drives the clamping cylinder 30 and the chuck 31 to move downward, and the chuck 31 moves toward the rightmost end cover 6 on the stepped shaft 27. When the piston rod of the lifting cylinder 29 is fully extended, the chuck 31 is just sleeved on the outside of the rightmost end cover 6 on the stepped shaft 27, as shown in FIG. Figure 17-18 As shown; S32, control the clamping oil cylinder 30 to start, the clamping oil cylinder 30 drives the clamping head 31 to close, and the clamping head 31 clamps and fixes the rightmost end cover 6 on the stepped shaft 27, such as Fig.19 As shown; S33, control the piston rod of the upper loading cylinder 28 of the upper loading mechanism 9 to extend to the right, and the piston rod drives the lifting cylinder 29, the clamping cylinder 30 and the end cover 6 clamped in the clamp 31 to move to the right, and the end cover 6 is separated from the stepped shaft 27 and moves toward the liquid outlet pipe 2 of the mass flow meter; when the piston rod of the upper loading cylinder 28 is fully extended, the end cover 6 is just sleeved on the liquid outlet pipe 2 of the mass flow meter, as shown in FIG. Figure 20~Figure 21As shown, and rests on the shoulder 4 of the liquid outlet pipe 2; S34, control the clamping cylinder 30 to close, and the chuck 31 is separated from the end cover 6; then control the piston rods of the lifting cylinder 29 and the upper cylinder 28 to retract, so that the chuck 31 of the clamping cylinder 30 moves to the second end cover 6 on the stepped shaft 27, thereby finally realizing the installation of the rightmost end cover 6 on the stepped shaft 27 onto the liquid outlet pipe 2 of the mass flow meter, as shown in FIG. Fig. 22 As shown; S4, control the servo motor 16 on the left side of the turnover mechanism 8 to start, the servo motor 16 drives the support seat 17 to rotate around its own axis, and the support seat 17 drives the mass flow meter to rotate synchronously. When the mass flow meter rotates 180°, the liquid inlet pipe 3 of the mass flow meter faces the upper loading station of the upper loading mechanism 9, such as Fig.23 Workers repeat the operation of step S3, you can achieve the end cover 6 on the stepped shaft 27 mounted on the mass flowmeter inlet pipe 3, such as Fig.24 As shown; Among them, it can be known from steps S2 to S4 that the device first positions the mass flowmeter in the positioning groove 18 of the support seat 17, and then through the linkage cooperation of the loading cylinder 28, the lifting cylinder 29 and the clamping cylinder 30 of the loading mechanism 9, an end cover 6 can be automatically installed on the inlet pipe 3 and the outlet pipe 2 of the mass flowmeter, and the end cover 6 is automatically placed against the shoulder 4. It can be seen that compared with the welding method in the workshop, the device does not require workers to manually put the two end covers 6 on the outlet pipe 2 and the inlet pipe 3 of the mass flowmeter, nor does it require workers to manually place the end cover 6 against the shoulder 4, but realizes automatic loading of the end cover, which not only greatly reduces the work intensity of the workers, but also shortens the loading time of the end cover 6, thereby greatly improving the welding efficiency of the mass flowmeter and the two end covers 6.

[0026] S5. Fixing of the two end covers 6 on the mass flow meter: The piston rods of the two horizontal cylinders 19 of the control turnover mechanism 8 are retracted, and the piston rods drive the connecting plate 20 to move toward the support seat 17, and the connecting plate 20 drives the force transmission rod 21 to move toward the support seat 17. At the same time, the force transmission rod 21 pushes the pressure plate 23 to rotate around the axis of the pin shaft 22 toward the support seat 17. When the piston rod of the horizontal cylinder 19 is fully retracted, the pressure plate 23 on the left side compresses the spring 24 and presses and fixes the end cover 6 on the liquid inlet pipe 3 to the shoulder 4 of the liquid inlet pipe 3. At the same time, the pressure plate 23 on the right side compresses the spring 24 and presses and fixes the end cover 6 on the liquid outlet pipe 2 to the shoulder 4 of the liquid outlet pipe 2, thereby finally realizing the fixing of the two end covers 6 on the mass flow meter, as shown in FIG. Figure 25-26 As shown; S6, the stepper motor 11 of the control turnover mechanism 8 is started, the stepper motor 11 drives the main shaft 12 to rotate, the main shaft 12 drives the turntable 13 to rotate, the turntable 13 drives the lifting cylinder 14, the support seat 17 and the mass flow meter to rotate synchronously, when the mass flow meter rotates 180°, the controller controls the stepper motor 11 to turn off, and the mass flow meter moves to the bottom of the welding mechanism 10, as shown in FIG. Fig. 27 As shown; S7, welding of the liquid inlet pipe 3 of the mass flow meter and its upper end cover 6, the specific operation steps are as follows: S71, the piston rod of the lifting cylinder 14 of the control turnover mechanism 8 extends upward, and the piston rod drives the frame 15, the servo motor 16, the support seat 17 and the mass flow meter to move upward synchronously. When the piston rod of the lifting cylinder 14 is fully extended, the annular gap formed between the liquid inlet pipe 3 of the mass flow meter and the end cover 6 is just facing the laser welding head 35 of the welding mechanism 10, as shown in FIG. Figure 28-29 As shown; S72, turning on the laser welding machine, the laser welding head 35 emits a laser beam, the emitted laser beam is irradiated to the annular gap between the liquid inlet pipe 3 and the end cover 6, and the liquid inlet pipe 3 and the end cover 6 begin to be welded together; S73, control the driving motor 33 of the welding mechanism 10 to start, the driving motor 33 drives the rotating plate 34 to rotate, the rotating plate 34 drives the laser welding head 35 to rotate, and the rotation direction of the laser welding head 35 is as follows: Fig.29 As shown by the middle arrow, when the laser welding head 35 rotates 180°, the liquid inlet pipe 3 and the end cover 6 of the mass flow meter can be welded together; S8, welding of the liquid outlet pipe 2 of the mass flow meter and its upper end cover 6, the specific operation steps are as follows: S81, control the piston rod of the lifting cylinder 14 to retract downward to separate the mass flow meter from the laser welding head 35; then control the servo motor 16 to start, the servo motor 16 support seat 17 to rotate, and the support seat 17 drives the mass flow meter to rotate synchronously. When the servo motor 16 rotates 180°, the controller controls the servo motor 16 to turn off; S82, the piston rod of the lifting cylinder 14 of the control turnover mechanism 8 extends upward, and the piston rod drives the frame 15, the servo motor 16, the support seat 17 and the mass flow meter to move upward synchronously. When the piston rod of the lifting cylinder 14 is fully extended, the annular gap formed between the liquid outlet pipe 2 of the mass flow meter and the end cover 6 is just facing the laser welding head 35 of the welding mechanism 10; S83, repeating the operations of S72 to S73, the liquid outlet pipe 2 of the mass flow meter and the end cover 6 can be welded together, thereby finally achieving the welding of two end covers 6 on the mass flow meter, and then producing the desired product; S9, taking away the product: the piston rod of the lifting cylinder 14 is controlled to retract downward, and then the piston rods of the two horizontal cylinders 19 on the support seat 17 are controlled to extend outward, the piston rod drives the connecting plate 20 to move outward, and the connecting plate 20 drives the force transmission rod 21 to move outward. Under the restoring force of the spring 24, the pressing plate 23 rotates outward, and the pressing plate 23 is separated from the end cover 6 of the product; after separation, the worker takes the product out of the support seat 17; S10. The worker repeats the operations of steps S2 to S9 for multiple times, and can continuously weld two end covers 6 on multiple mass flow meters, thereby producing multiple required products.

[0027] Among them, in step S5, firstly, by controlling the piston rods of the two horizontal oil cylinders 19 of the turnover mechanism 8 to retract, the pressure plate 23 can be pressed on the outer end surface of the end cover 6, so that the end cover 6 on the outlet pipe 2 is pressed and fixed on the shoulder 4 of the outlet pipe 2, and the end cover 6 on the inlet pipe 3 is pressed and fixed on the shoulder 4 of the inlet pipe 3; then in steps S7-S8, through the two actions of the welding mechanism 10, the welding of the inlet pipe 3 of the mass flowmeter and its upper end cover 6 can be realized, and the welding of the outlet pipe 2 of the mass flowmeter and its upper end cover 6 can be realized, so as to obtain the desired product. It can be seen that during the welding process, the end cover 6 is always welded against the shoulder 4 by the pressure plate 23, thereby effectively avoiding the gap between the end cover 6 and the shoulder 4 under the welding force, ensuring that the end cover 6 is welded in a state of close fit with the shoulder 4, thereby greatly improving the welding quality of the mass flowmeter and the two end covers 6.

Claims

1. A device for high-efficiency and high-precision welding of end covers on aircraft engine mass flow meters, characterized in that: It comprises a workbench (7), on which a turnover mechanism (8) for assembling and conveying the mass flow meter is arranged, and on which a mounting mechanism (9) located on the left side of the turnover mechanism (8) and for automatically and continuously mounting an end cover (6) on the mass flow meter is arranged, and a welding mechanism (10) is arranged on the mounting mechanism (9); The revolving mechanism (8) comprises a stepper motor (11) fixedly mounted on the bottom surface of a workbench (7), and a main shaft (12) fixedly connected to the output shaft of the stepper motor (11); the main shaft (12) passes through the workbench (7) upwards and a turntable (13) is mounted on the extended end; lifting cylinders (14) are fixedly mounted on the bottom surfaces of the left and right ends of the turntable (13); the piston rod of the lifting cylinder (14) on the left side passes through the turntable (13) upwards and a frame (15) is fixedly mounted on the extended end; a servo motor (16) is fixedly mounted in the frame (15); the output shaft of the servo motor (16) passes through the top wall of the frame (15) upwards and a support seat (17) is fixedly mounted on the extended end; a positioning groove (18) is formed on the top surface of the support seat (17); the positioning groove (18) matches the outer contour of a flowmeter body (1) of the mass flowmeter; Horizontal oil cylinders (19) are fixedly provided on the left and right end surfaces of the support seat (17), connecting plates (20) are fixedly provided on the action ends of the piston rods of the two horizontal oil cylinders (19), and force transmission rods (21) are fixedly provided on the inner end surfaces of the two connecting plates (20). Pressure plates (23) inclined outwardly are rotatably mounted on the left and right end surfaces of the support seat (17) via distribution shafts (22), and a spring (24) is fixedly provided between the pressure plate (23) and the support seat (17). Under the elastic force of the spring (24), the outer end surface of the pressure plate (23) abuts against the force transmission rod (21).

2. The device for high-efficiency and high-precision welding of end covers on aircraft engine mass flow meters according to claim 1 is characterized in that: The upper mounting mechanism (9) comprises a vertical plate (25) fixedly mounted on the workbench (7) surface, a bracket (26) fixedly mounted on the right end surface of the vertical plate (25), and a stepped shaft (27) fixedly mounted on the outer end surface of the bracket (26); an upper mounting cylinder (28) is fixedly mounted on the left end surface of the bracket (26) and directly above the stepped shaft (27); a piston rod of the upper mounting cylinder (28) penetrates the bracket (26) to the right, and a lifting cylinder (29) is fixedly mounted on the extended end; a clamping cylinder (30) is fixedly mounted on the active end of the piston rod of the lifting cylinder (29); and a clamping head (31) on the clamping cylinder (30) is located directly above the small shaft of the stepped shaft (27).

3. The device for high-efficiency and high-precision welding of end covers on aircraft engine mass flow meters according to claim 2, characterized in that: The diameter of the small shaft of the stepped shaft (27) is equal to the diameter of the central hole (5) of the end cover (6).

4. The device for high-efficiency and high-precision welding of end covers on aircraft engine mass flow meters according to claim 3 is characterized in that: The welding mechanism (10) comprises a horizontal plate (32) fixedly arranged at the top end of the vertical plate (25), the horizontal plate (32) extending rightward to the top of the rotating mechanism (8), and a driving motor (33) fixedly arranged on the bottom surface of the extending end, a rotating plate (34) connected to the output shaft of the driving motor (33), a laser welding head (35) fixedly arranged at the top end of the rotating plate (34), and the laser welding head (35) connected to a laser welding machine.

5. The device for high-efficiency and high-precision welding of end covers on aircraft engine mass flow meters according to claim 4, characterized in that: The two lifting cylinders (14) of the turnover mechanism (8) are arranged symmetrically with respect to the main shaft (12).

6. The device for high-efficiency and high-precision welding of end covers on aircraft engine mass flow meters according to claim 5, characterized in that: A plurality of support legs supported on the ground are fixedly arranged on the bottom surface of the workbench (7).

7. The device for high-efficiency and high-precision welding of end covers on aircraft engine mass flow meters according to claim 6, characterized in that: The device further comprises a controller, which is electrically connected to the stepping motor (11), the servo motor (16), the drive motor (33), the upper loading cylinder (28), the lifting cylinder (29), the jacking cylinder (14) and the clamping cylinder (30) via a signal line.

8. A method for efficiently and accurately welding an end cover on an aircraft engine mass flow meter, using the device for efficiently and accurately welding an end cover on an aircraft engine mass flow meter according to claim 7, characterized in that: It includes the following steps: S1. A worker takes out a plurality of end caps (6), and sequentially mounts the plurality of end caps (6) on the small shaft of the stepped shaft (27) of the upper mounting mechanism (9) from left to right, and ensures that the leftmost end cap (6) abuts against the stepped surface of the stepped shaft (27). At this time, the rightmost end cap (6) on the stepped shaft (27) is just below the clamping head (31) of the upper mounting mechanism (9); S2. The worker takes out a mass flow meter and inserts the flow meter body (1) of the mass flow meter from top to bottom into the positioning groove (18) of the support seat (17) on the left side of the turnover mechanism (8). Since the positioning groove (18) matches the outer contour of the flow meter body (1) of the mass flow meter, the mass flow meter is positioned. At this time, the liquid outlet pipe (2) of the mass flow meter is just opposite to the small axis of the stepped shaft (27) of the upper mounting mechanism (9) on the left and right. S3. Install the rightmost end cover (6) on the stepped shaft (27) onto the liquid outlet pipe (2) of the mass flow meter. The specific operation steps are as follows: S31, the piston rod of the lifting cylinder (29) of the control upper mounting mechanism (9) is extended downward, the piston rod drives the clamping cylinder (30) and the chuck (31) to move downward, and the chuck (31) moves toward the rightmost end cover (6) on the stepped shaft (27). When the piston rod of the lifting cylinder (29) is fully extended, the chuck (31) is just sleeved on the outside of the rightmost end cover (6) on the stepped shaft (27); S32, controlling the clamping oil cylinder (30) to start, the clamping oil cylinder (30) drives the clamping head (31) to close, and the clamping head (31) clamps and fixes the rightmost end cover (6) on the stepped shaft (27); S33, controlling the piston rod of the upper loading cylinder (28) of the upper loading mechanism (9) to extend to the right, the piston rod drives the lifting cylinder (29), the clamping cylinder (30) and the end cover (6) clamped in the clamp (31) to move to the right, the end cover (6) is separated from the stepped shaft (27) and moves toward the liquid outlet pipe (2) of the mass flow meter; when the piston rod of the upper loading cylinder (28) is fully extended, the end cover (6) is just sleeved on the liquid outlet pipe (2) of the mass flow meter and abuts against the shoulder (4) of the liquid outlet pipe (2); S34, controlling the clamping cylinder (30) to close, so that the clamping head (31) is separated from the end cover (6); then controlling the piston rods of the lifting cylinder (29) and the upper installation cylinder (28) to retract, so that the clamping head (31) of the clamping cylinder (30) moves to the second end cover (6) on the stepped shaft (27), thereby finally achieving the installation of the rightmost end cover (6) on the stepped shaft (27) onto the liquid outlet pipe (2) of the mass flow meter; S4, the servo motor (16) on the left side of the control turnover mechanism (8) is started, the servo motor (16) drives the support seat (17) to rotate around its own axis, and the support seat (17) drives the mass flow meter to rotate synchronously. When the mass flow meter rotates 180 degrees, the liquid inlet pipe (3) of the mass flow meter faces the upper installation station of the upper installation mechanism (9); the worker repeats the operation of step S3 to realize the upper installation of the end cover (6) on the stepped shaft (27) onto the liquid inlet pipe (3) of the mass flow meter; S5. Fixing the two end covers (6) on the mass flow meter: The piston rods of the two horizontal oil cylinders (19) of the control turnover mechanism (8) are retracted, and the piston rods drive the connecting plate (20) to move toward the support seat (17). The connecting plate (20) drives the force transmission rod (21) to move toward the support seat (17). At the same time, the force transmission rod (21) pushes the pressure plate (23) to rotate around the axis of the pin (22) toward the support seat (17). When the horizontal oil cylinders (19) of the control turnover mechanism (8) are retracted, the piston rods drive the connecting plate (20) to move toward the support seat (17). After the piston rod of the cylinder (19) is fully retracted, the pressure plate (23) located on the left side compresses the spring (24) and presses and fixes the end cover (6) on the liquid inlet pipe (3) onto the shoulder (4) of the liquid inlet pipe (3). At the same time, the pressure plate (23) located on the right side compresses the spring (24) and presses and fixes the end cover (6) on the liquid outlet pipe (2) onto the shoulder (4) of the liquid outlet pipe (2), thereby finally realizing the tooling fixation of the two end covers (6) on the mass flow meter; S6, the stepper motor (11) of the control turnover mechanism (8) is started, the stepper motor (11) drives the main shaft (12) to rotate, the main shaft (12) drives the turntable (13) to rotate, the turntable (13) drives the lifting cylinder (14), the support seat (17) and the mass flow meter to rotate synchronously, and when the mass flow meter rotates 180 degrees, the controller controls the stepper motor (11) to turn off, and the mass flow meter moves to the bottom of the welding mechanism (10); S7. Welding the liquid inlet pipe (3) of the mass flow meter to its upper end cover (6). The specific operation steps are as follows: S71, the piston rod of the lifting cylinder (14) of the control turnover mechanism (8) extends upward, and the piston rod drives the frame (15), the servo motor (16), the support seat (17) and the mass flow meter to move upward synchronously. When the piston rod of the lifting cylinder (14) is fully extended, the annular gap formed between the liquid inlet pipe (3) and the end cover (6) of the mass flow meter is just facing the laser welding head (35) of the welding mechanism (10); S72, turning on the laser welding machine, emitting a laser beam from the laser welding head (35), and irradiating the annular gap between the liquid inlet pipe (3) and the end cover (6), so that the liquid inlet pipe (3) and the end cover (6) begin to be welded together; S73, controlling the driving motor (33) of the welding mechanism (10) to start, the driving motor (33) drives the rotating plate (34) to rotate, the rotating plate (34) drives the laser welding head (35) to rotate, and when the laser welding head (35) rotates 180°, the liquid inlet pipe (3) and the end cover (6) of the mass flow meter can be welded together; S8. Welding the liquid outlet pipe (2) of the mass flow meter to its upper end cover (6). The specific operation steps are as follows: S81, controlling the piston rod of the lifting cylinder (14) to retract downward, so that the mass flow meter is separated from the laser welding head (35); then controlling the servo motor (16) to start, the servo motor (16) support base (17) to rotate, and the support base (17) drives the mass flow meter to rotate synchronously, and when the servo motor (16) rotates 180°, the controller controls the servo motor (16) to turn off; S82, the piston rod of the lifting cylinder (14) of the control turnover mechanism (8) extends upward, and the piston rod drives the frame (15), the servo motor (16), the support seat (17) and the mass flow meter to move upward synchronously. When the piston rod of the lifting cylinder (14) is fully extended, the annular gap formed between the liquid outlet pipe (2) of the mass flow meter and the end cover (6) is just facing the laser welding head (35) of the welding mechanism (10); S83, repeating the operations of S72 to S73, the liquid outlet pipe (2) of the mass flow meter and the end cover (6) can be welded together, thereby finally achieving the welding of two end covers (6) on the mass flow meter, and then producing the desired product; S9, product removal: the piston rod of the lifting cylinder (14) is controlled to retract downward, and then the piston rods of the two horizontal cylinders (19) on the support seat (17) are controlled to extend outward, the piston rod drives the connecting plate (20) to move outward, the connecting plate (20) drives the force transmission rod (21) to move outward, and under the restoring force of the spring (24), the pressing plate (23) rotates outward, and the pressing plate (23) is separated from the end cover (6) of the product; after separation, the worker removes the product from the support seat (17); S10. The worker repeats the operations of steps S2 to S9 for multiple times, and can continuously weld two end covers (6) on multiple mass flow meters, thereby producing multiple required products.

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