A welding device for a model rocket engine outer frame

Abstract

The application discloses a kind of welding devices of model rocket engine outer frame, belong to welding equipment technical field, including frame assembly and positioning module, positioning module is by gripper assembly and traction component, gripper assembly is equipped with two groups of gripper axle disc, is placed in the both ends of axle cylinder frame and can be axially movable, multiple radial telescopic bending moment arms are rotationally installed in the outer diameter end of gripper axle disc along the circumference array, the present application is by symmetrically setting gripper assembly in the both ends of axle cylinder frame, utilize multiple bending moment arms synchronous radial telescoping, realize the automatic centering of annular frame and coaxial, effectively avoid eccentric displacement, bending moment arm is vertically contracted after centering, incremental pressure is applied to make frame tightly press in vertical support, ensure that there is no gap between welding surface, reduce the risk of false welding, positioning module can also extend into frame interior operation, avoid interference between structural member.

Description

Technical Field

[0001] This invention belongs to the field of welding equipment technology, specifically relating to a welding device for the external frame of a model rocket engine. Background Technology

[0002] In the engine structure of a model rocket, the ring frame and the vertical support are usually connected by welding to form an integral support skeleton. The ring frame is responsible for providing radial constraints and positioning support, while the vertical support undertakes the function of axial load transfer, together forming a lightweight and highly rigid load-bearing structure.

[0003] Because the annular frame and the vertical support are arranged very closely in space, the space available for the positioning device to operate inside the structure is very limited, making it difficult to achieve flexible attitude adjustment. During the welding process, since the model rocket engine is usually slender and multiple annular frames are arranged at intervals along the axis, it is difficult to maintain the coaxiality between two or more sets of annular frames without the addition of special fixtures or rigid positioning tools. Welding thermal stress and assembly stress can easily cause the annular frames to tilt or shift relative to each other, thereby destroying the overall axial straightness.

[0004] Furthermore, it is difficult to guarantee the fit between the ring frame and the vertical support before welding. Due to the machining errors of the components and the existence of assembly gaps, local contact may be loose at the welding position, resulting in insufficient penetration, filler gaps with solder or forming a false weld, which further deteriorates the welding quality. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a welding device for the external frame of a model rocket engine, so as to solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A welding device for the external frame of a model rocket engine includes a frame assembly and a positioning module. The frame assembly includes a shaft cylinder frame, and the positioning module includes a clamp assembly and a traction assembly. The clamp assembly includes a clamp shaft disc and bending moment arms. The two sets of clamp shaft discs are respectively disposed at both ends of the shaft cylinder frame, and the clamp shaft discs are movably assembled along the axial direction of the shaft cylinder frame. Several bending moment arms are rotatably installed on the outer diameter end of the clamp shaft disc. The bending moment arms are arranged in an array along the circumferential direction, and several bending moment arms have radial extension and retraction functions. The traction assembly includes a ring frame and a cross shaft disc. The ring frame is fixedly assembled to one end of the clamp shaft disc, one end of the cross shaft disc is fixedly connected to the ring frame, and the other end of the cross shaft disc is movably connected to the shaft cylinder frame.

[0007] As a further embodiment of the present invention, the frame assembly further includes a connector, a beam frame, a bidirectional motor, and a transmission screw. One end of the connector is fixedly fitted with the beam frame, and the beam frame and the shaft cylinder frame are fixedly connected. The bidirectional motor is arranged inside the shaft cylinder frame, and both ends of the bidirectional motor are fitted with transmission screws.

[0008] As a further embodiment of the present invention, the clamp assembly further includes a limiting cover, a limiting groove, a side bracket, a gear shaft, and a [missing information]. The limiting cover is disposed on the top side of the clamp shaft disc, the limiting groove is disposed on the bottom side of the clamp shaft disc, and several of the side brackets are fixedly assembled to the outer diameter end of the clamp shaft disc. A gear shaft and [missing information] are rotatably mounted on the side brackets. The gear shaft and the bending moment arm are coaxially and fixedly connected, and [missing information] meshes with the gear shaft. The clamp assembly further includes a positioning wheel, which is fixedly assembled to the end of the bending moment arm. A positioning groove is provided in the middle of the bending moment arm, and the spacing width of the positioning groove is greater than the thickness of the annular frame.

[0009] As a further embodiment of the present invention, the traction assembly further includes a positioning rod, a positioning hole, a traction shaft disc, and a positioning sleeve. The positioning rod is fixedly mounted on the shaft sleeve frame. The positioning hole is provided on the cross shaft disc and slidably sleeved on the positioning rod. The traction shaft disc is engaged with the transmission screw. A plurality of positioning sleeves are also provided on the traction shaft disc, and the positioning sleeves are slidably sleeved on the positioning rod.

[0010] As a further embodiment of the present invention, the traction assembly further includes a locking axle disc, a linkage rod, an external elastic element, and a built-in elastic element. A plurality of linkage rods are fixedly mounted on one end of the locking axle disc. The linkage rods pass through the cross axle disc, and the ends of the linkage rods are fixedly mounted on the traction axle disc. An external elastic element and a built-in elastic element are also sleeved on the linkage rods. The external elastic element is disposed between the cross axle disc and the locking axle disc, and the built-in elastic element is disposed between the cross axle disc and the traction axle disc.

[0011] As a further embodiment of the present invention, the welding device for the external frame of the model rocket engine further includes a transmission assembly. The transmission assembly includes a transmission shaft ring, a side push plate, connecting sections, and a driven ring. The transmission shaft ring is rotatably mounted on the clamping shaft disk. A side push plate is fixedly provided at one end of the transmission shaft ring. Several connecting sections are fixedly provided at the bottom of the transmission shaft ring. The several connecting sections pass through the limiting groove. The driven ring is arranged on the bottom side of the clamping shaft disk and is fixedly connected to the several connecting sections.

[0012] As a further embodiment of the present invention, the transmission assembly further includes a shaft hole, an external bushing, an internal shaft rod, a shaft assembly, an adjusting cylinder, and a tailstock. The shaft hole is located on one side of the driven ring, and the internal shaft rod is slidably fitted at both ends of the external bushing. The end of the internal shaft rod is rotatably fitted into the shaft hole. The shaft assembly is rotatably sleeved in the middle of the external shaft sleeve. The cylinder shaft at one end of the adjusting cylinder is fixedly connected to the shaft assembly, and a tailstock is fixedly installed at the other end of the adjusting cylinder. The tailstock is rotatably installed on the beam frame.

[0013] As a further embodiment of the present invention, the transmission assembly further includes a driven shaft ring, a transverse groove, a transmission gear disc, a ring guide rod, and a preload elastic element. The driven shaft ring is rotatably sleeved on the clamping shaft disc and arranged on the outside of the transmission shaft ring. The driven shaft ring is provided with a transverse groove. The lateral push plate is limited and assembled in the transverse groove. Several transmission gear discs are also assembled on the outer diameter end of the driven shaft ring. The transmission gear discs are meshed with the driven shaft ring. Several ring guide rods are also arranged on the outer wall side of the driven shaft ring. The preload elastic element is sleeved on the ring guide rod. One end of the lateral push plate is slidably assembled on the ring guide rod, and the other end of the lateral push plate elastically abuts against the preload elastic element.

[0014] In summary, the embodiments of the present invention have the following beneficial effects compared with the prior art: This invention symmetrically sets clamp assemblies at both ends of the shaft cylinder frame, and uses multiple moment arms to synchronously extend and retract radially to uniformly abut against the annular frame from the inner wall, driving the frame to automatically adjust to be concentric with the clamp shaft disk, ensuring that the annular frames at both ends reach a highly consistent coaxial state before welding, effectively avoiding eccentric displacement and ensuring welding quality; Furthermore, after centering, the bending moment arm contracts vertically, the traction ring frame clamps the vertical support, and the elastic element in the traction assembly is gradually compressed under the action of resistance, applying increasing pressure to the cross shaft disc, so that the frame is pressed tightly against the mating surface with gradually increasing force, ensuring that the welding surface fits without gaps, and reducing the risk of false welding or desoldering. Furthermore, the positioning module can freely extend and retract along the axial direction to adapt to ring frames of different diameters. When retracted, it can extend into the frame from the gap of the vertical support to unfold and position, allowing operation in narrow work positions. After welding is completed, it can be retracted and removed to avoid interference with the surrounding structure. It can complete continuous circumferential welding and greatly improve the degree of automation. Attached Figure Description

[0015] Figure 1 This is an installation diagram of one embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the retracted state of the moment arm in one embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the extended state of the moment arm in one embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the clamp assembly in one embodiment of the present invention.

[0019] Figure 5 for Figure 4 Enlarged schematic diagram of reference numeral A in the attached figure.

[0020] Figure 6 This is a partial structural diagram of the transmission component in one embodiment of the present invention.

[0021] Figure 7 for Figure 6 Enlarged schematic diagram of reference numeral B in the attached figure.

[0022] Figure 8 This is a schematic diagram illustrating the assembly principle of the positioning wheel and the ring frame in one embodiment of the present invention.

[0023] Figure label: Frame assembly, 101-connector, 102-beam frame, 103-shaft cylinder frame, 104-bidirectional motor, 105-drive lead screw; Clamp assembly, 201-clamp shaft disc, 202-limiting cover, 203-limiting groove, 204-side bracket, 205-gear shaft, 206-bending moment arm, 207-positioning wheel, 208-positioning groove; Traction assembly, 301-ring frame, 302-cross shaft disc, 303-positioning rod, 304-positioning hole, 305-traction shaft disc, 306-positioning sleeve, 307-locking shaft disc, 308-linkage rod, 309-external elastic element, 310-internal elastic element; Transmission assembly, 401-Transmission shaft collar, 402-Side push plate, 403-Connecting section, 404-Driven ring, 405-Shaft hole, 406-External bushing, 407-Internal shaft rod, 408-Shaft assembly, 409-Adjusting cylinder, 410-Tailstock, 411-Driven shaft collar, 412-Horizontal groove, 413-Transmission gear plate, 414-Ring guide rod, 415-Preload elastic element. Detailed Implementation

[0024] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Please see Figures 1-8A welding device for the external frame of a model rocket engine in one embodiment of the present invention includes a frame assembly 1 and a positioning module. The frame assembly 1 includes a shaft frame 103, and the positioning module includes a clamp assembly 2 and a traction assembly 3. The clamp assembly 2 includes a clamp shaft disc 201 and a moment arm 206. Two sets of clamp shaft discs 201 are respectively disposed at both ends of the shaft frame 103, and the clamp shaft discs 201 are movably assembled along the axial direction of the shaft frame 103. A plurality of moment arms 206 are rotatably installed on the outer diameter end of the clamp shaft disc 201. The moment arms 206 are arranged in an array along the circumferential direction, and the plurality of moment arms 206 have a radial extension and retraction function. The traction assembly 3 includes a ring frame 301 and a cross shaft disc 302. The ring frame 301 is fixedly assembled to one end of the clamp shaft disc 201, one end of the cross shaft disc 302 is fixedly connected to the ring frame 301, and the other end of the cross shaft disc 302 is movably connected to the shaft frame 103.

[0026] In practical application, the external frame of the model rocket engine in this embodiment mainly consists of a ring frame and a vertical support. The main structure of the welding device is composed of a frame assembly 1 and a positioning module. One end of the frame assembly 1 can be fixedly mounted on the welding robotic arm. Two sets of positioning modules are respectively arranged at both ends of the shaft tube frame 103 for clamping and positioning the ring frame. The two sets of positioning modules can freely extend and retract along the axial direction of the shaft tube frame 103, thereby adaptively adjusting the distance between the two sets of ring frames to be welded according to different vertical support lengths. The positioning module is equipped with a movable moment arm. 206, the moment arm 206 is arranged on the clamp shaft disk 201 in a rotationally symmetrical manner along the circumference, and several moment arms 206 rotate synchronously in the circumference, so that when the moment arm 206 performs synchronous radial extension and retraction, it can abut against the inner wall side of the ring frame, and in the process of continuously applying radial force, it drives the ring frame to move further until it is coaxial with the clamp shaft disk 201, thereby ensuring that both sets of ring frames are coaxial with the shaft cylinder frame 103 equipment, thus ensuring coaxial accuracy before the welding operation is performed, and effectively preventing eccentric displacement or structural shaking during the welding process; The bending moment arm 206 also has the function of synchronous extension and retraction in the vertical direction. After completing the centering and alignment operation of the two sets of annular frames, the bending moment arm 206 can perform synchronous retraction in the vertical direction to pull the two sets of annular frames closer to each other, and further clamp the annular frames to the vertical support arranged between them, thereby promoting a tight fit between the contact surfaces to be welded, preventing process defects such as incomplete welding or detachment during the welding process. In addition, since the positioning module has a movable extension and retraction mechanism, it has a relative extended state and a retracted state. When it is in the retracted state, the positioning module can extend into the frame that has been partially welded along the gap between the vertical supports to perform the unfolding operation, thereby enabling the positioning welding function in a narrow work position. After the welding is completed, it can also be retracted and taken out from the inside of the structure, with more flexible freedom, further avoiding interference between the welding device and the surrounding structure.

[0027] Furthermore, the frame assembly 1 also includes a connector 101, a beam frame 102, a bidirectional motor 104, and a transmission screw 105. One end of the connector 101 is fixedly mounted with the beam frame 102, and the beam frame 102 and the shaft cylinder frame 103 are fixedly connected. The bidirectional motor 104 is located inside the shaft cylinder frame 103, and both ends of the bidirectional motor 104 are equipped with transmission screws 105. One end of the connector 101 is fixedly connected to the end effector interface of the welding robotic arm, and its spatial posture and working direction can be freely adjusted within a Cartesian coordinate system. (The last sentence appears to be incomplete and possibly refers to a different topic.) The structure of the robotic arm is specifically defined. The beam frame 102 on one side of the connector 101 is rigidly fixed to the shaft frame 103. An annular guide groove structure is provided at the outer diameter end face of the shaft frame 103. A slide module with circumferential rotation capability and a welding gun assembly that works in coordination with it can be pre-assembled in the annular guide groove, thereby realizing continuous welding operation in the circumferential direction of the workpiece. The motor shafts at both ends of the bidirectional motor 104 are coaxially driven and connected to the transmission screw 105, and the helical tooth patterns of the two sets of transmission screws 105 are symmetrically arranged to realize bidirectional synchronous feed motion.

[0028] Please see Figure 4 and Figure 5 In a preferred embodiment of the present invention, the clamp assembly 2 further includes a limiting cover 202, a limiting groove 203, a side bracket 204, and gear shafts 205 and 209. The limiting cover 202 is disposed on the top side of the clamp shaft disk 201, the limiting groove 203 is disposed on the bottom side of the clamp shaft disk 201, and several of the side brackets 204 are fixedly assembled on the outer diameter end of the clamp shaft disk 201. Gear shafts 205 and 209 are rotatably mounted on the side brackets 204. The gear shaft 205 is coaxially fixedly connected to the moment arm 206, and the 209 is meshed with the gear shaft 205.

[0029] In practical application, the limiting cover 202 is located on the top of the clamp shaft disk 201 and is used to limit the assembly of the lateral push plate 402. The limiting groove 203 is located on the bottom of the clamp shaft disk 201 and is used to limit the assembly of the connecting section 403. Several side supports 204 are also provided on the outer diameter end of the clamp shaft disk 201. A gear shaft 205 and another gear shaft 209 are rotatably mounted on the side supports 204. The bending moment arm 206 is coaxially fixedly assembled with the gear shaft 205. They form a rigid connection. One end of the gear shaft 209 meshes with the gear shaft 205, and the other end of the gear shaft 209 meshes with the transmission gear disk 413. Thus, when the transmission gear disk 413 rotates along its circumference, the gear shaft 209 rotates synchronously under the meshing transmission action, and further drives the meshing gear shaft 205 to rotate. In turn, the gear shaft 205 drives the fixedly connected moment arm 206 to achieve radial extension and retraction displacement.

[0030] Furthermore, the clamp assembly 2 also includes a positioning wheel 207, which is fixedly mounted on the end of the moment arm 206. The moment arm 206 has a positioning groove 208 in the middle. The spacing width of the positioning groove 208 is greater than the thickness of the annular frame. When the moment arm 206 rotates and unfolds outward, the positioning wheel 207 located at the end of the moment arm forms an abutment with the inner diameter surface of the annular frame, thereby confining the annular frame within the groove structure of the positioning groove 208. When multiple moment arms 206 continuously perform radial extension movements outward, the component force generated along the circumferential direction will drive the annular frame to move along the radial plane to the axial position concentric with the clamp shaft disk 201, so as to achieve mutual cancellation of the component forces in each direction, thereby driving the annular frame and the positioning module to gradually approach a concentric state. Since the two sets of positioning modules are arranged coaxially, they can guide the two sets of annular frames to move synchronously to the concentric axial position.

[0031] Please see Figure 7 In a preferred embodiment of the present invention, the traction assembly 3 further includes a positioning rod 303, a positioning hole 304, a traction shaft disc 305, and a positioning sleeve 306. The positioning rod 303 is fixedly mounted on the shaft sleeve frame 103. The positioning hole 304 is disposed on the cross shaft disc 302 and slidably sleeved on the positioning rod 303. The traction shaft disc 305 is engaged with the transmission screw 105. A plurality of positioning sleeves 306 are also arranged on the traction shaft disc 305, and the positioning sleeves 306 are slidably sleeved on the positioning rod 303.

[0032] In practical application, the positioning rod 303 is fixedly mounted on the shaft sleeve 103. The positioning sleeve 306 on one side of the traction shaft disc 305 is slidably sleeved on the outer wall of the positioning rod 303. The traction shaft disc 305 and the transmission screw 105 are connected by a threaded pair, so that when the transmission screw 105 is driven to rotate, it can drive the traction shaft disc 305 to move linearly in the vertical direction through the threaded transmission action, and simultaneously drive the cross shaft disc 302 connected to one side of the traction shaft disc 305 to move. Due to the ring frame 301 and The cross shaft discs 302 are fixedly assembled, and the bottom of the cross shaft discs 302 is fixedly assembled to the lower end face of the clamping shaft discs 201. Therefore, when the transmission screw 105 rotates, it can synchronously drive the two sets of clamping shaft discs 201 to extend and retract synchronously in the vertical direction. The linear movement directions of the two sets of clamping shaft discs 201 are opposite. When the two sets of clamping shaft discs 201 approach each other, the two sets of annular frames installed on them can clamp towards the middle in the horizontal direction at the same time, so that the two mating surfaces to be welded are kept in a tight fit to form a stable welding contact condition.

[0033] Please see Figure 7 In a preferred embodiment of this invention, the traction assembly 3 further includes a locking axle disc 307, a linkage rod 308, an external elastic element 309, and an internal elastic element 310. A plurality of linkage rods 308 are fixedly mounted on one end of the locking axle disc 307. The linkage rods 308 pass through the cross axle disc 302, and their ends are fixedly mounted on the traction axle disc 305. An external elastic element 309 and an internal elastic element 310 are also sleeved on the linkage rods 308. The external elastic element 309 is disposed between the cross axle disc 302 and the locking axle disc 307, and the internal elastic element 310 is disposed between the cross axle disc 302 and the traction axle disc 305.

[0034] In practical application, since the bottom of the locking shaft disc 307 is fixedly equipped with several linkage rods 308, and the ends of the linkage rods 308 are fixedly equipped on the traction shaft disc 305, when the traction shaft disc 305 performs telescopic movement in the vertical direction, the linkage rods 308 move synchronously with the traction shaft disc 305, thereby realizing the rigid transmission of the movement trajectory. Since the linkage rods 308 are also fitted with external elastic elements 309 and internal elastic elements 310, and both the external elastic elements 309 and the internal elastic elements 310 are in movable contact with the cross shaft disc 302, when the ten... When the cross shaft disk 302 is not subjected to external mechanical force, both the external elastic element 309 and the internal elastic element 310 are in a non-compression state, that is, no elastic compression or tensile deformation occurs, and their free length remains at the initial set value. At this time, the external elastic element 309 and the internal elastic element 310 do not generate any elastic restoring force on the cross shaft disk 302. Since the positioning wheel 207 at the end of the moment arm 206 is engaged with the inner wall of the annular frame, forming a rolling or sliding limiting fit, when the annular frame abuts against the vertical support under external force, the moment arm 209... 6. The clamping shaft disk 201, which is fixedly connected to it, is subject to a resistance and limiting constraint in the opposite direction of movement. This resistance and limiting constraint work together to restrict the further displacement of the clamping shaft disk 201 and the moment arm 206. At this time, as the linkage rod 308 continues to move vertically along with the traction shaft disk 305, the cross shaft disk 302 is subjected to the reverse limiting action from the moment arm 206 and the clamping shaft disk 201, causing the contact pressure between the external elastic element 309 and the cross shaft disk 302 to gradually increase. The axial compressive load borne by the external elastic element 309 increases. The load increases continuously with the displacement of the traction shaft disk 305, causing the external elastic element 309 to undergo elastic compression deformation. This, in turn, applies a monotonically increasing pressure to the cross shaft disk 302 through the contact surface. This pressure is transmitted to the annular frame through the cross shaft disk 302, causing the annular frame to be tightly pressed against the outer surface or mating surface of the vertical support with a gradually increasing clamping force. This ensures the fit between the annular frame and the vertical support under both dynamic and static conditions, preventing gaps caused by vibration or relative sliding, and ensuring the connection rigidity and positioning accuracy of the overall structure.

[0035] Please see Figure 5 and Figure 6In a preferred embodiment of the present invention, the welding device for the outer frame of the model rocket engine further includes a transmission assembly 4. The transmission assembly 4 includes a transmission shaft ring 401, a lateral push plate 402, a connecting section 403, and a driven ring 404. The transmission shaft ring 401 is rotatably mounted on the clamping shaft disk 201. A lateral push plate 402 is fixedly provided at one end of the transmission shaft ring 401. A plurality of connecting sections 403 are fixedly provided at the bottom of the transmission shaft ring 401. The plurality of connecting sections 403 pass through the limiting groove 203. The driven ring 404 is arranged on the bottom side of the clamping shaft disk 201 and is fixedly connected to the plurality of connecting sections 403.

[0036] In practical application, the transmission shaft ring 401 is rotatably sleeved on the clamp shaft disc 201 and axially limited to the bottom of the limiting cover 202. Simultaneously, its radial direction is constrained by the inner wall of the limiting cover 202, forming a fixed-axis rotating pair around the central axis of the clamp shaft disc 201. The connecting section 403 at the bottom of the lateral push plate 402 passes through the limiting groove 203. The limiting groove 203 is arc-shaped along the circumference of the clamp shaft disc 201 and has a preset angle range, thereby limiting the transmission... The rotation center line of the collar 401 relative to the clamp shaft disk 201 and the rotation angle around the center line are defined. The driven ring 404 is arranged at one end of the clamp shaft disk 201 and is fixedly connected to the connecting section 403. When the driven ring 404 generates angular displacement in the circumferential direction under external driving action, the torque can be transmitted simultaneously to several connecting sections 403 and the transmission collar 401 through the connecting section 403, thereby driving the transmission collar 401 and the driven ring 404 to achieve synchronous fixed-axis rotation.

[0037] Please see Figure 6 In a preferred embodiment of the present invention, the transmission assembly 4 further includes a shaft hole 405, an external bushing 406, an internal shaft rod 407, a shaft assembly 408, an adjusting cylinder 409, and a tailstock 410. The shaft hole 405 is located on one side of the driven ring 404. The internal shaft rod 407 is slidably mounted on both ends of the external bushing 406. The end of the internal shaft rod 407 is rotatably mounted in the shaft hole 405. The shaft assembly 408 is rotatably sleeved on the middle of the external bushing 406. The cylinder shaft at one end of the adjusting cylinder 409 is fixedly connected to the shaft assembly 408. The tailstock 410 is fixedly mounted on the other end of the adjusting cylinder 409. The tailstock 410 is rotatably mounted on the beam frame 102.

[0038] In practical application, the shaft hole 405 is located on one side of the driven ring 404. An internal shaft rod 407 is slidably inserted into the outer bushing 406, and the end of the internal shaft rod 407 is rotatably installed in the shaft hole 405. This allows the outer bushing 406 to synchronously drive the two sets of driven rings 404 to generate corresponding angular displacements when it moves along a circumferential path, thereby achieving coordinated adjustment of the rotation angles of the two sets of transmission shaft rings 401. Since the internal shaft rod 407 is slidably inserted inside the outer bushing 406, when the two sets of clamping shaft discs 201 perform synchronous telescopic movements in the vertical direction, the internal shaft rod 407 can perform corresponding telescopic compensation along the axial direction of the outer bushing 406, ensuring that the outer bushing 406 always maintains contact with the driven ring 404. In the linkage state, the outer diameter end of the external bushing 406 is also rotatably fitted with a shaft assembly 408. The shaft assembly 408 is fixedly connected to the cylinder shaft of the adjusting cylinder 409. The end of the adjusting cylinder 409 is provided with a tail seat 410. The tail seat 410 is mounted on the beam frame 102 in the form of a rotating pair. When the adjusting cylinder 409 is in the ventilated working state, its cylinder shaft extends outward, driving the body of the adjusting cylinder 409 and its tail seat 410 to deflect around the rotation center, thereby pushing the external bushing 406 to rotate away from the beam frame 102. Through this rotational displacement, the external bushing 406 drives the internal shaft 407 to move accordingly. The internal shaft 407 then transmits this motion to the driven ring 404, thereby driving the driven ring 404 to produce a corresponding rotational action.

[0039] Please see Figure 5 In a preferred embodiment of the present invention, the transmission assembly 4 further includes a driven shaft ring 411, a transverse groove 412, a transmission gear disc 413, a ring guide rod 414, and a preload elastic element 415. The driven shaft ring 411 is rotatably sleeved on the clamp shaft disc 201 and arranged outside the transmission shaft ring 401. The driven shaft ring 411 is provided with a transverse groove 412. The lateral push plate 402 is limited and assembled in the transverse groove 412. A plurality of transmission gear discs 413 are also assembled on the outer diameter end of the driven shaft ring 411. The transmission gear discs 413 and 209 mesh with each other. A plurality of ring guide rods 414 are also arranged on the outer wall side of the driven shaft ring 411. The preload elastic element 415 is sleeved on the ring guide rod 414. One end of the lateral push plate 402 is slidably assembled on the ring guide rod 414, and the other end of the lateral push plate 402 elastically abuts against the preload elastic element 415.

[0040] In practical application, the driven shaft ring 411 is rotatably sleeved on the outside of the transmission shaft ring 401, and the transverse groove 412 opened on the wall of the driven shaft ring 411 is sleeved on the lateral push plate 402, so that the lateral push plate 402 can be slidably assembled on the transverse groove 412 and the ring guide rod 414, thereby forming a sliding assembly relationship. When the driven ring 404 drives the transmission shaft ring 401 to perform rotational movement, the lateral push plate 402 fixed on one side of the transmission shaft ring 401 moves along the ring guide rod 414. The axial guide track rotates, and simultaneously, the lateral push plate 402 moves and abuts against the pre-compression elastic element 415 during rotation. This applies a periodic compression action to the pre-compression elastic element 415 through the lateral push plate 402, causing the pre-compression elastic element 415 to accumulate elastic potential energy and push the driven shaft ring 411 in the opposite direction, resulting in a relative rotational displacement. Since a transmission gear disc 413 is provided on one side of the driven shaft ring 411, and this transmission gear disc 413 is in a meshing engagement state with the adjacently arranged gear 209, therefore… The rotational motion of the driven shaft ring 411 can synchronously drive the bending moment arm 206 to rotate through the meshing transmission relationship between the transmission gear disc 413 and the gear 209. This causes the positioning wheel 207 at the end of the bending moment arm 206 to move radially and lock onto the inner wall end face of the annular frame, achieving initial positioning contact. As the transmission shaft ring 401 continues to rotate, the preload force transmitted from the preload elastic element 415 on the positioning wheel 207 gradually increases. Under the action of this increasing preload force, the two sets of annular frames gradually enter the centering clamping working state, that is, the central axes of the two sets of annular frames tend to coincide and remain relatively stable. Furthermore, when the traction disc 305 applies axial traction, the two sets of annular frames move towards each other under the traction drive of the traction disc 305. This further clamps the joint between the annular frame and the vertical support on the basis of centering clamping, thereby completing the precise positioning and clamping fixation process required for the workpiece to be welded before the welding operation.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for the external frame of a model rocket engine, characterized in that, include: A frame assembly and a positioning module, the frame assembly including a shaft sleeve frame, the positioning module including a clamp assembly and a traction assembly; The clamp assembly includes a clamp shaft disc and bending moment arms. The two sets of clamp shaft discs are respectively disposed at both ends of the shaft cylinder frame, and the clamp shaft discs are movably assembled along the axial direction of the shaft cylinder frame. Several bending moment arms are rotatably installed on the outer diameter end of the clamp shaft disc. The bending moment arms are arranged in an array along the circumferential direction, and several bending moment arms have radial extension and retraction functions. The traction assembly includes a ring frame and a cross shaft disc. The ring frame is fixedly assembled to one end of the clamp shaft disc, one end of the cross shaft disc is fixedly connected to the ring frame, and the other end of the cross shaft disc is movably connected to the shaft cylinder frame.

2. The welding device for the external frame of a model rocket engine according to claim 1, characterized in that, The frame assembly also includes a connector, a beam frame, a bidirectional motor, and a transmission screw. One end of the connector is fixedly fitted with the beam frame, and the beam frame and the shaft cylinder frame are fixedly connected. The bidirectional motor is located inside the shaft cylinder frame, and both ends of the bidirectional motor are fitted with transmission screws.

3. The welding device for the external frame of a model rocket engine according to claim 1, characterized in that, The clamp assembly also includes a limiting cover, a limiting groove, a side bracket, a gear shaft, and a limit cover. The limiting cover is located on the top side of the clamp shaft disc, the limiting groove is located on the bottom side of the clamp shaft disc, and several side brackets are fixedly assembled to the outer diameter end of the clamp shaft disc. A gear shaft and a limit arm are rotatably mounted on the side brackets. The gear shaft and the bending moment arm are coaxially fixedly connected, and the limit arm meshes with the gear shaft. The clamp assembly also includes a positioning wheel, which is fixedly mounted to the end of the moment arm, and a positioning groove is provided in the middle of the moment arm, the spacing of which is greater than the thickness of the annular frame.

4. The welding device for the external frame of a model rocket engine according to claim 1, characterized in that, The traction assembly also includes a positioning rod, a positioning hole, a traction shaft disc, and a positioning sleeve. The positioning rod is fixedly mounted on the shaft sleeve frame. The positioning hole is located on the cross shaft disc and slidably mounted on the positioning rod. The traction shaft disc is meshed with the transmission screw. Several positioning sleeves are also arranged on the traction shaft disc, and the positioning sleeves are slidably mounted on the positioning rod.

5. The welding device for the external frame of a model rocket engine according to claim 4, characterized in that, The traction assembly further includes a locking axle disc, a linkage rod, an external elastic element, and a built-in elastic element. A plurality of linkage rods are fixedly mounted on one end of the locking axle disc. The linkage rods pass through the cross axle disc and are fixedly mounted on the traction axle disc. An external elastic element and a built-in elastic element are also sleeved on the linkage rods. The external elastic element is disposed between the cross axle disc and the locking axle disc, and the built-in elastic element is disposed between the cross axle disc and the traction axle disc.

6. The welding device for the external frame of a model rocket engine according to claim 1, characterized in that, The welding device for the external frame of the model rocket engine also includes a transmission assembly, which includes a transmission shaft ring, a side push plate, connecting sections, and a driven ring. The transmission shaft ring is rotatably mounted on the clamping shaft disk. A side push plate is fixedly provided at one end of the transmission shaft ring. Several connecting sections are fixedly provided at the bottom of the transmission shaft ring. Several connecting sections pass through the limiting groove. The driven ring is arranged on the bottom side of the clamping shaft disk and is fixedly connected to several connecting sections.

7. The welding device for the external frame of a model rocket engine according to claim 1, characterized in that, The transmission assembly also includes a shaft hole, an external bushing, an internal shaft, a shaft assembly, an adjusting cylinder, and a tailstock. The shaft hole is located on one side of the driven ring. The internal shaft is slidably fitted at both ends of the external bushing, and the end of the internal shaft is rotatably fitted into the shaft hole. The shaft assembly is rotatably sleeved in the middle of the external shaft sleeve. The cylinder shaft at one end of the adjusting cylinder is fixedly connected to the shaft assembly, and a tailstock is fixedly installed at the other end of the adjusting cylinder. The tailstock is rotatably installed on the beam frame.

8. The welding device for the external frame of a model rocket engine according to claim 7, characterized in that, The transmission assembly further includes a driven shaft ring, a transverse groove, a transmission gear disc, a ring guide rod, and a preload elastic element. The driven shaft ring is rotatably sleeved on the clamping shaft disc and arranged on the outside of the transmission shaft ring. The driven shaft ring is provided with a transverse groove. The lateral push plate is limited and assembled in the transverse groove. Several transmission gear discs are also assembled on the outer diameter end of the driven shaft ring. The transmission gear discs are meshed with the driven shaft ring. Several ring guide rods are also arranged on the outer wall side of the driven shaft ring. The preload elastic element is sleeved on the ring guide rod. One end of the lateral push plate is slidably assembled on the ring guide rod, and the other end of the lateral push plate elastically abuts against the preload elastic element.

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