Stretching device for automobile silencer shell

Abstract

The invention discloses a stretching device for an automobile silencer shell, and relates to the technical field of automobile manufacturing, the stretching device comprises a bottom box and a shell stretching mechanism, the shell stretching mechanism comprises a placing table and a stretching cylinder, and the placing table is fixedly installed in the middle of the bottom box through bolts; the two stretching cylinders are movably installed at the top end of the containing table in a sliding mode, the embracing mechanism comprises embracing molds, and the two embracing molds are movably arranged on the left sides and the right sides of the two stretching cylinders correspondingly. Through heating of the heating pipe and movement of the stretching cylinder, the round aluminum alloy cylinder body used for manufacturing the automobile silencer shell is stretched and deformed from inside to outside, and the two embracing molds are driven to embrace at the same time, so that the inner wall of the round aluminum alloy cylinder body forms an oval mold; the cylindrical aluminum alloy cylinder body is stretched by the stretching cylinder and extruded by the embracing die to form an oval shape, at the moment, stretching of the cylinder body is completed, and the machining efficiency of the automobile silencer shell is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, in particular to a stretching device for an automobile muffler shell. Background Art

[0002] The automobile muffler is an important part of the automobile emission system. Its main function is to reduce the noise generated when the motor vehicle engine is working. The shell of the automobile muffler is mostly composed of a hollow elliptical shell body and two flat shells. Its structural design and manufacturing quality directly affect the comfort and environmental protection performance of the car. The Chinese patent application with application number 202220744630.X discloses "an automobile muffler shell stretching device, an automobile muffler shell stretching device, comprising a base, a support column is arranged on the top of the base, an elliptical mounting plate is arranged on the top of the support column, a support rod is arranged on the top of the mounting plate, two electric push rods are symmetrically fixed on the top of the support rod, and the telescopic ends of the two electric push rods are fixedly connected with a stretching rod, and a rod support is arranged at the bottom end of the stretching rod: the utility model is provided with a shaping process after the stretching rod is stretched, and the gear meshing drives the turning handle and the winding rod to make an elliptical detour, and the slider on the winding rod slides in the upper end slide groove of the mounting plate, thereby realizing the rotation of the winding rod around the mounting plate with an elliptical structure". This technical solution only solves the problem that the existing automobile muffler shell stretching device does not have a shaping process after the stretching is completed and cannot ensure the accuracy of the workpiece shape after processing. In the existing automobile muffler shell stretching device, when stretching the aluminum alloy cylinder body, the forming speed is often slow, and after the cylinder body is stretched from a circle to an ellipse, it is necessary to take out the cylinder body and then flange its two ends. This step not only requires the staff to take out the cylinder body from the stretching device, but also requires an additional flanging device, resulting in high labor intensity for the staff and low production efficiency. Summary of the invention

[0003] The object of the present invention is to provide a stretching device for an automobile muffler shell to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a stretching device for an automobile muffler housing, comprising a bottom box, two shells are respectively fixedly installed on the top left and right sides of the bottom box by bolts, and also comprises a housing stretching mechanism, an embracing mechanism and an edge stretching mechanism: The shell stretching mechanism includes a placing table and a stretching cylinder. The placing table is fixedly installed in the middle of the bottom box by bolts. There are two stretching cylinders, both of which are installed on the top of the placing table by sliding movement. The embracing mechanism comprises an embracing mold, and there are two embracing molds, which are movably arranged on the left and right sides of the two stretching cylinders respectively; The edge stretching mechanism includes a lifting plate and an edge extrusion ring. There are four lifting plates and they are movably arranged at the top and bottom ends of the two embracing molds. There are four edge extrusion rings and they are fixed on the inner sides of the four lifting plates by bolts.

[0005] Preferably, the shell stretching mechanism includes a first threaded rod, a dual-axis motor, a support rod and a top plate, the bottom end of the first threaded rod is movably mounted in the middle of the top of the placing table through a bearing, the dual-axis motor is fixedly mounted in the middle of the inner top of the placing table through bolts, an output shaft at the top of the dual-axis motor is fixedly connected to the bottom end of the first threaded rod through bolts, there are two support rods, both of which are fixedly mounted on the top of the placing table through bolts, and are respectively located at the front and rear ends of the first threaded rod, the top plate is fixedly mounted on the top of the two support rods through bolts, the top end of the first threaded rod is movably mounted in the middle of the bottom end of the top plate through a bearing, and two ends of the first threaded rod are engraved with two sections of threads in opposite directions.

[0006] Preferably, the shell stretching mechanism includes a first partition, a second partition, a first sliding sleeve and a push rod. The first partition is fixedly sleeved in the middle of the two support rods by bolts, and the first partition is movably sleeved in the middle of the first threaded rod. There are two second partitions, which are fixedly sleeved on the two support rods by bolts, and are respectively located in the middle of the placement table and the first partition, and in the middle of the first partition and the top plate, and are respectively movably sleeved between two sections of threads at both ends of the first threaded rod. There are two groups of first sliding sleeves, which are movably sleeved on both ends of the first threaded rod by threads, and are respectively located on two sections of threads in opposite directions. There are two groups of push rods on each first sliding sleeve, and the end close to the first threaded rod is movably installed in the middle of the front and rear sides of the first sliding sleeve through a rotating shaft, and the end away from the first threaded rod is movably installed on the side of the two stretching cylinders close to the first threaded rod through a rotating shaft.

[0007] Preferably, the shell stretching mechanism includes a heating tube, a translation groove and a movable groove. There are two heating tubes and they are fixed inside the two stretching tubes by bolts respectively. There are two movable grooves and they are respectively opened in the middle of the left and right sides of the top of the placing table. There are two groups of translation grooves and they are respectively opened on the left and right sides of the top of the placing table, and they are respectively located at the front and rear sides of the two movable grooves. The bottom ends of the two stretching tubes are respectively installed in the two groups of translation grooves by insertion and movement, and the bottom ends of the heating tubes are respectively installed in the two movable grooves by insertion and movement.

[0008] Preferably, the embracing mechanism includes a support plate, a second threaded rod, a limit rod and a second sliding sleeve. There are two groups of support plates and they are fixedly installed inside the two shells by bolts respectively. There are two second threaded rods and they are movably installed in the middle of the two groups of support plates by bearings respectively. The two ends of the second threaded rod are movably installed at the top and bottom ends inside the two shells respectively by bearings. There are two groups of limit rods and two rods in each group, and they are fixedly installed inside the two shells by bolts respectively, and they are fixedly installed in the two support plates by insertion, and they are respectively located at the front and rear ends of the two second threaded rods. There are two groups of second sliding sleeves and they are movably sleeved on the two ends of the two second threaded rods by threads respectively.

[0009] Preferably, the embracing mechanism includes a connecting seat, a push plate, a connecting frame and a first synchronous belt. The connecting seat is fixedly installed in the middle of one side close to the stretching cylinder by bolts. There are two push plates on each connecting seat and they are movably installed on the front and rear sides of the connecting seat through a rotating shaft. There are two connecting frames and they are movably installed on one end of the left and right groups of push plates close to the stretching cylinder through a rotating shaft. The two embracing molds are fixedly installed on one end of the two connecting frames close to the stretching cylinder by bolts. There are two first synchronous belts and one end close to the first threaded rod is movably sleeved on the output shaft at the bottom end of the dual-axis motor. The two ends of the first synchronous belts away from the first threaded rod are movably sleeved on one end of the two second threaded rods located in the bottom box.

[0010] Preferably, the edge stretching mechanism includes a telescopic box, a telescopic gear, a gear shaft, a telescopic rod and a telescopic rack. There are four telescopic boxes in total and they are fixedly mounted on the front and rear sides of the two connecting frames by bolts respectively. The telescopic gear is movably mounted in the middle of the telescopic box through a bearing. The gear shaft is movably mounted in the middle of the telescopic box and the connecting frame by insertion. The telescopic gear is fixedly sleeved on the gear shaft by bolts. The end of the telescopic rod close to the lifting plate is fixedly connected to the lifting plate by bolts, and the end of the telescopic rod away from the lifting plate is movably mounted in the telescopic box by insertion. There are two telescopic racks in each telescopic box, which are respectively located on both sides of the telescopic gear and are movably connected to the telescopic gear by meshing. The end of the telescopic rack located outside the telescopic box is fixedly connected to the adjacent lifting plate by bolts.

[0011] Preferably, the edge stretching mechanism includes a worm wheel, a worm, a protrusion, a driving motor and a rotating sleeve, there are two worm wheels and they are respectively fixedly sleeved on one end of the two gear shafts located on the front side and located outside the telescopic box by bolts, there are two worm screws and one end close to the worm wheel is movably mounted on the side of the two telescopic boxes located on the front side and away from the connecting frame through a bearing, the worm screw and the worm wheel are movably connected through meshing, the protrusion is fixedly mounted on the worm screw through integral molding, the driving motor is fixedly mounted on the inner left side wall of a shell located on the left side by bolts, there are two rotating sleeves, and one rotating sleeve located at the left end is fixedly mounted on the output shaft of the driving motor at one end away from the stretching cylinder by bolts, and one rotating sleeve located at the right end is movably mounted on the inner right side wall of a shell located at the right end at one end away from the stretching cylinder through a bearing, and the two worm screws are respectively movably mounted in the two rotating sleeves by insertion.

[0012] Preferably, the edge stretching mechanism includes a slot, a transmission rod, a synchronization rod and a second synchronization belt, the slot is opened inside the rotating sleeve, the protrusion is movably installed in the slot by insertion, there are two transmission rods and they are movably installed in the middle of two connecting frames through bearings, the two ends of the two transmission rods are respectively fixedly connected to the ends of the four gear shafts close to the connecting frames by bolts, the two ends of the synchronization rod are respectively movably installed in the middle of the inner rear side walls of the two shells through bearings, there are two second synchronization belts and they are respectively movably sleeved on the ends of the two rotating sleeves away from the stretching cylinder and the synchronization rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention drives the first threaded rod to rotate, drives the upper and lower first sliding sleeves to move simultaneously, and drives the two stretching cylinders to move in a direction away from the first threaded rod through the push rod. The circular aluminum alloy cylinder body used to make the automobile muffler shell is stretched and deformed from the inside to the outside through the heating of the heating tube and the movement of the stretching cylinder, and at the same time drives the two embracing dies to embrace, so that the inner wall thereof forms an elliptical mold. The cylindrical aluminum alloy cylinder body is stretched by the stretching cylinder and extruded by the embracing die to form an elliptical shape. At this time, the cylinder body stretching is completed, thereby improving the processing efficiency of the automobile muffler shell; 2. The present invention drives the lifting plate to move, thereby driving the edge extrusion ring to be inserted into the two ends of the elliptical aluminum alloy cylinder body. While the edge extrusion ring is inserted, the cylinder body is limited by the embracing mold to avoid deformation, and the two ends are exaggerated outward, so that the two ends of the elliptical cylinder body are stretched into a horizontal state. At this time, the stretching and flanging of the two ends of the elliptical cylinder body of the automobile muffler are completed, so that the end of the automobile muffler shell can be quickly flanging after stretching and forming, which reduces the labor intensity of the staff and improves the production efficiency of the automobile muffler shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1Provides an overall structural diagram for an embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a housing provided by an embodiment of the present invention; Figure 3 A schematic diagram of the connection between the shell stretching mechanism and the embracing mechanism provided in an embodiment of the present invention; Figure 4 A schematic diagram of a shell stretching mechanism provided in an embodiment of the present invention; Figure 5 A schematic diagram of an embracing mechanism and an edge stretching mechanism provided in an embodiment of the present invention; Figure 6 A schematic diagram of the connection between the push plate and the connecting frame provided in an embodiment of the present invention; Figure 7 A schematic diagram of an edge stretching mechanism provided by an embodiment of the present invention; Figure 8 A schematic diagram of the structure of a protrusion and a slot provided in an embodiment of the present invention.

[0015] In the figure: 1, bottom box; 2, shell; 3, shell stretching mechanism; 301, placement table; 302, first threaded rod; 303, double-axis motor; 304, support rod; 305, top plate; 306, first partition; 307, second partition; 308, first sliding sleeve; 309, push rod; 310, stretching cylinder; 311, heating tube; 312, translation slot; 313, movable slot; 4, embracing mechanism; 401, support plate; 402, second threaded rod; 403, limit rod; 404, second sliding sleeve; 405, connection Seat; 406, push plate; 407, connecting frame; 408, embracing mold; 409, first synchronous belt; 5, edge stretching mechanism; 501, telescopic box; 502, telescopic gear; 503, gear shaft; 504, telescopic rod; 505, telescopic rack; 506, lifting plate; 507, edge extrusion ring; 508, worm wheel; 509, worm; 510, bump; 511, driving motor; 512, rotating sleeve; 513, slot; 514, transmission rod; 515, synchronous rod; 516, second synchronous belt. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figures 1 to 8The present invention provides a technical solution: a stretching device for a car muffler shell, comprising a bottom box 1, two shells 2 are respectively fixedly installed on the top left and right sides of the bottom box 1 by bolts, and also comprises a shell stretching mechanism 3, an embracing mechanism 4 and an edge stretching mechanism 5: The shell stretching mechanism 3 includes a placing table 301 and a stretching cylinder 310. The placing table 301 is fixedly installed in the middle of the bottom box 1 by bolts. There are two stretching cylinders 310, both of which are installed on the top of the placing table 301 by sliding movement. The embracing mechanism 4 includes an embracing mold 408. There are two embracing molds 408, which are movably arranged on the left and right sides of the two stretching cylinders 310 respectively; The edge stretching mechanism 5 includes a lifting plate 506 and an edge extrusion ring 507. There are four lifting plates 506 and they are movably arranged at the top and bottom ends of the two embracing molds 408. There are four edge extrusion rings 507 and they are fixed on the inner sides of the four lifting plates 506 by bolts.

[0018] The shell stretching mechanism 3 includes a first threaded rod 302, a dual-axis motor 303, a support rod 304 and a top plate 305. The bottom end of the first threaded rod 302 is movably mounted in the middle of the top of the placement table 301 through a bearing. The dual-axis motor 303 is fixedly mounted in the middle of the inner top of the placement table 301 through bolts. An output shaft at the top of the dual-axis motor 303 is fixedly connected to the bottom end of the first threaded rod 302 through bolts. There are two support rods 304, both of which are fixedly mounted on the top of the placement table 301 through bolts, and are respectively located at the front and rear ends of the first threaded rod 302. The top plate 305 is fixedly mounted on the tops of the two support rods 304 through bolts. The top of the first threaded rod 302 is movably mounted in the middle of the bottom of the top plate 305 through a bearing. Two sections of threads in opposite directions are engraved on both ends of the first threaded rod 302. The aluminum alloy cylinder to be stretched is placed on the placement table 301, and the first threaded rod 302 is driven to rotate by the dual-axis motor 303. The shell stretching mechanism 3 includes a first baffle 306, a second baffle 307, a first sleeve 308 and a push rod 309. The first baffle 306 is fixedly sleeved in the middle of the two support rods 304 by bolts. The first baffle 306 is movably sleeved in the middle of the first threaded rod 302. There are two second baffles 307, which are respectively fixedly sleeved on the two support rods 304 by bolts, and are respectively located in the middle of the placement table 301 and the first baffle 306, and in the middle of the first baffle 306 and the top plate 305, and are respectively movably sleeved between the two sections of threads at both ends of the first threaded rod 302. There are two sets of first sleeves 308, which are respectively movably sleeved in the first threaded rod 302 by threads. The two ends of a threaded rod 302 are respectively located on two sections of threads in opposite directions. There are two groups of push rods 309 on each first sliding sleeve 308, and the end close to the first threaded rod 302 is movably installed in the middle of the front and rear sides of the first sliding sleeve 308 through a rotating shaft, and the end away from the first threaded rod 302 is movably installed on the side of the two stretching cylinders 310 close to the first threaded rod 302 through a rotating shaft; the first threaded rod 302 is driven to rotate by a double-axis motor 303. When the first threaded rod 302 rotates, the upper and lower groups of first sliding sleeves 308 are driven to move simultaneously, and each group of first sliding sleeves 308 moves toward the second partition plate 307 between them; The shell stretching mechanism 3 includes a heating tube 311, a translation groove 312 and a movable groove 313. There are two heating tubes 311 and they are fixedly installed in the inside of the two stretching tubes 310 by bolts. There are two movable grooves 313 and they are respectively opened in the middle of the left and right sides of the top of the placing platform 301. There are two groups of translation grooves 312 and they are respectively opened on the left and right sides of the top of the placing platform 301, and they are respectively located in the front and rear sides of the two movable grooves 313. The bottom ends of the two stretching tubes 310 are respectively installed in the two groups of translation grooves 312 by insertion and movement, and the bottom ends of the heating tubes 311 are respectively installed in the two movable grooves 313 by insertion and movement; the two stretching tubes 310 are driven to move in the direction away from the first threaded rod 302 by the push rod 309, and the heating tube 311 is started. The cylindrical aluminum alloy body is stretched and deformed by the heating of the heating tube 311 and the movement of the stretching tube 310; The embracing mechanism 4 includes a support plate 401, a second threaded rod 402, a limit rod 403 and a second sliding sleeve 404. There are two groups of support plates 401 and they are fixedly installed inside the two shells 2 by bolts. There are two second threaded rods 402 and they are movably installed in the middle of the two groups of support plates 401 by bearings. The two ends of the second threaded rod 402 are movably installed at the top and bottom ends of the two shells 2 by bearings. There are two groups of limit rods 403 and two limit rods in each group, which are fixedly installed inside the two shells 2 by bolts and fixedly installed in the two support plates 401 by insertion, and are respectively located at the front and rear ends of the two second threaded rods 402. There are two groups of second sliding sleeves 404 and they are movably sleeved on the two ends of the two second threaded rods 402 by threads. The second threaded rod 402 supports and fixes the second threaded rod 402 and the limit rod 403, and the second threaded rod 402 drives the second sliding sleeve 404 to move. The embracing mechanism 4 includes a connecting seat 405, a push plate 406, a connecting frame 407 and a first synchronous belt 409. The connecting seat 405 is fixedly installed in the middle of one side close to the stretching cylinder 310 by bolts. There are two push plates 406 on each connecting seat 405 and they are movably installed on the front and rear sides of the connecting seat 405 through a rotating shaft. There are two connecting frames 407 and they are movably installed on one end of the left and right groups of push plates 406 close to the stretching cylinder 310 through a rotating shaft. Two embracing molds 408 are fixedly installed on one end of the two connecting frames 407 close to the stretching cylinder 310 by bolts. There are two first synchronous belts 409 and one end close to the first threaded rod 302 is movably sleeved on the output shaft at the bottom end of the dual-axis motor 303. One end of each first synchronous belt 409 away from the first threaded rod 302 is movably sleeved on one end of the two second threaded rods 402 located in the bottom box 1; the connecting frame 407 is pushed by the push plate 406 to move in the direction close to the stretching cylinder 310, and the embracing mold 408 is driven to move at the same time by the connecting frame 407. When the second sliding sleeve 404 moves to the support plate 401, the two embracing molds 408 are embraced, so that the inner walls thereof form an elliptical mold, and while the embracing mold 408 is moving, the stretching cylinder 310 stretches the aluminum alloy cylinder body outwards. When the embracing molds 408 are fully embraced, the cylindrical aluminum alloy cylinder body is stretched by the stretching cylinder 310 and extruded by the embracing mold 408 to form an elliptical shape, and at this time, the cylinder body stretching is completed; The edge stretching mechanism 5 includes a telescopic box 501, a telescopic gear 502, a gear shaft 503, a telescopic rod 504 and a telescopic rack 505. There are four telescopic boxes 501, which are fixedly installed on the front and rear sides of the two connecting frames 407 by bolts, respectively. The telescopic gear 502 is movably installed in the middle of the telescopic box 501 through a bearing, and the gear shaft 503 is movably installed in the middle of the telescopic box 501 and the connecting frame 407 by insertion. The telescopic gear 502 is fixedly sleeved on the gear shaft 503 by bolts, and the end of the telescopic rod 504 close to the lifting plate 506 is fixedly connected to the lifting plate 506 by bolts, and the end of the telescopic rod 504 away from the lifting plate 506 is movably installed in the telescopic box 501 by insertion. There are a total of telescopic racks 505 in each telescopic box 501. Two, and are respectively located on both sides of the telescopic gear 502, and are connected to the telescopic gear 502 through meshing activities. The end of the telescopic rack 505 located outside the telescopic box 501 is fixedly connected to the adjacent lifting plate 506 through bolts; the gear shaft 503 located at the rear end is driven to rotate simultaneously through the telescopic rod 504. When the gear shaft 503 rotates, the telescopic gear 502 in the telescopic box 501 is driven to rotate, and the two telescopic racks 505 in the telescopic box 501 are driven to move in the direction of the telescopic gear 502 at the same time through the telescopic gear 502, and the lifting plate 506 is driven to move in the direction of the embracing mold 408 through the telescopic rack 505, and simultaneously move to the edge extrusion ring 507 through the lifting plate 506, and are inserted into the two ends of the elliptical aluminum alloy cylinder through the edge extrusion ring 507; The edge stretching mechanism 5 includes a worm wheel 508, a worm 509, a protrusion 510, a driving motor 511 and a rotating sleeve 512. There are two worm wheels 508, which are respectively fixedly sleeved on the ends of the two gear shafts 503 located on the front side and located outside the telescopic box 501 by bolts. There are two worm wheels 509, and one end close to the worm wheel 508 is movably installed on the side of the two telescopic boxes 501 located on the front side away from the connecting frame 407 through a bearing. The worm 509 is movably connected with the worm wheel 508 by meshing. The protrusion 510 is fixedly installed on the worm wheel 509 by integral molding. The driving motor 511 is fixedly installed on the inner left wall of a housing 2 located on the left side by bolts. The rotating sleeve 512 has two Two, and one end of a rotating sleeve 512 located at the left end away from the stretching cylinder 310 is fixedly installed on the output shaft of the driving motor 511 by bolts, and one end of a rotating sleeve 512 located at the right end away from the stretching cylinder 310 is movably installed on the inner right side wall of a housing 2 at the right end through a bearing, and two worms 509 are movably installed in the two rotating sleeves 512 by insertion respectively; through the engagement of the protrusion 510 and the slot 513, when the rotating sleeve 512 rotates, even if the worm 509 extends out of the rotating sleeve 512, it can also drive the worm 509 to rotate, and the rotating worm 509 drives the worm wheel 508 to rotate, and when the worm wheel 508 rotates, it drives the gear shaft 503 to rotate; The edge stretching mechanism 5 includes a slot 513, a transmission rod 514, a synchronization rod 515 and a second synchronization belt 516. The slot 513 is opened inside the rotating sleeve 512. The protrusion 510 is installed in the slot 513 by insertion. There are two transmission rods 514 and they are installed in the middle of the two connecting frames 407 through bearings. The two ends of the two transmission rods 514 are respectively fixedly connected to one end of the four gear shafts 503 close to the connecting frame 407 by bolts. The two ends of the synchronization rod 515 are respectively installed in the middle of the inner rear side walls of the two housings 2 through bearings. There are two synchronous belts 516, which are movably connected to the ends of the two rotating sleeves 512 away from the stretching cylinder 310 and the synchronous rod 515 respectively; the rotating sleeve 512 is driven to rotate by the driving motor 511, and the synchronous rod 515 is driven to rotate by a second synchronous belt 516 close to the driving motor 511, and then a rotating sleeve 512 away from the driving motor 511 is driven to rotate by a second synchronous belt 516 away from the driving motor 511, and the worm 509 inserted in the rotating sleeve 512 moves simultaneously with the connecting frame 407 through the telescopic box 501.

[0019] Working principle: When the present invention is used, the aluminum alloy cylinder body used for making automobile mufflers is sleeved outside the two stretching cylinders 310, so that the bottom end of the cylinder body is placed on the placement table 301, and then the double-axis motor 303 is started, and the first threaded rod 302 is driven to rotate by the double-axis motor 303. When the first threaded rod 302 rotates, the upper and lower groups of first sliding sleeves 308 are driven to move simultaneously, and each group of first sliding sleeves 308 moves toward the second partition 307 between them. When the first sliding sleeve 308 moves, the two stretching cylinders 310 are driven to move away from the first threaded rod 302 through the push rod 309, and the heating tube 311 is started. Through the heating of the heating tube 311 and the movement of the stretching tube 310, the cylindrical aluminum alloy cylinder body is stretched and deformed; When the dual-axis motor 303 is started, the second threaded rod 402 is driven to rotate through the first synchronous belt 409. When the second threaded rod 402 rotates, the second sleeves 404 at both ends are driven to move toward the support plate 401. When the second sleeve 404 moves, the connecting frame 407 is pushed to move toward the direction close to the stretching cylinder 310 through the push plate 406, and the embracing mold 408 is driven to move at the same time through the connecting frame 407. When the second sleeve 404 moves to the support plate 401, the two embracing molds 408 are embraced, so that the inner wall thereof forms an elliptical mold, and while the embracing mold 408 is moving, the stretching cylinder 310 stretches the aluminum alloy cylinder body outward, and when the embracing mold 408 is fully embraced, the cylindrical aluminum alloy cylinder body is stretched by the stretching cylinder 310 and extruded by the embracing mold 408 to form an elliptical shape, and at this time, the cylinder body stretching is completed; When the automobile muffler barrel is stretched, the drive motor 511 is started, and the rotating sleeve 512 is driven to rotate by the drive motor 511, and the synchronous rod 515 is driven to rotate by a second synchronous belt 516 close to the drive motor 511, and then a rotating sleeve 512 away from the drive motor 511 is driven to rotate by a second synchronous belt 516 away from the drive motor 511, and the worm 509 inserted into the rotating sleeve 512 moves simultaneously with the connecting frame 407 through the telescopic box 501, and the worm 509 extends out from the rotating sleeve 512 at this time, and when the rotating sleeve 512 rotates, the engagement of the protrusion 510 and the card slot 513 makes it possible for the rotating sleeve 512 to rotate even if the worm 509 extends out of the rotating sleeve 512, and the rotating worm 509 drives the worm wheel 508 to rotate, and when the worm wheel 508 rotates, the belt The movable gear shaft 503 rotates, and the gear shaft 503 at the rear end is driven to rotate simultaneously through the telescopic rod 504. When the gear shaft 503 rotates, the telescopic gear 502 in the telescopic box 501 is driven to rotate, and the two telescopic racks 505 in the telescopic box 501 are driven to move in the direction of the telescopic gear 502 through the telescopic gear 502. The lifting plate 506 is driven to move in the direction of the embracing mold 408 through the telescopic rack 505, and the lifting plate 506 is moved simultaneously to the edge extrusion ring 507 through the lifting plate 506. The edge extrusion ring 507 is inserted into the two ends of the elliptical aluminum alloy cylinder body. When the edge extrusion ring 507 is inserted, the cylinder body is limited by the embracing mold 408, and no stretching deformation occurs, but the two ends are exaggerated outwards until the plane end of the edge extrusion ring 507 stretches one end of the expanded cylinder body into a horizontal state. At this time, the stretching and flanging of the two ends of the elliptical cylinder body of the automobile muffler are completed; After the stretching is completed, the driving motor 511 is first controlled to reverse to reset the lifting plate 506, and then the dual-axis motor 303 is controlled to reverse to reset the embracing mold 408 and the stretching cylinder 310. At this time, the stretched automobile muffler shell can be easily taken out.

[0020] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stretching device for an automobile muffler housing, comprising a bottom box (1), wherein two housings (2) are fixedly mounted on the top left and right sides of the bottom box (1), respectively, and characterized in that: It also includes a shell stretching mechanism (3), an embracing mechanism (4) and an edge stretching mechanism (5): An outer shell stretching mechanism (3), the outer shell stretching mechanism (3) comprising a placement table (301) and a stretching cylinder (310), the placement table (301) being fixedly mounted in the middle of the bottom box (1), and the stretching cylinders (310) having two movably mounted on the top of the placement table (301); An embracing mechanism (4), the embracing mechanism (4) comprising an embracing mold (408), wherein there are two embracing molds (408) in total and the embracing molds (408) are movably arranged on the left and right sides of the two stretching cylinders (310); An edge stretching mechanism (5), the edge stretching mechanism (5) comprising a lifting plate (506) and an edge extrusion ring (507), the lifting plates (506) being four in total and being movably arranged at the top and bottom ends of two embracing dies (408), and the edge extrusion ring (507) being four in total and being fixedly mounted on the inner sides of the four lifting plates (506).

2. A stretching device for a car muffler housing according to claim 1, characterized in that: The shell stretching mechanism (3) comprises a first threaded rod (302), a double-axis motor (303), a support rod (304) and a top plate (305); the bottom end of the first threaded rod (302) is movably mounted on the middle of the top end of the placement platform (301) via a bearing; the double-axis motor (303) is fixedly mounted on the middle of the inner top end of the placement platform (301) via bolts; an output shaft at the top end of the double-axis motor (303) is fixedly connected to the bottom end of the first threaded rod (302) via bolts; there are two support rods (304) both of which are fixedly mounted on the top end of the placement platform (301) via bolts and are respectively located at the front and rear ends of the first threaded rod (302); the top plate (305) is fixedly mounted on the top ends of the two support rods (304) via bolts; the top end of the first threaded rod (302) is movably mounted on the middle of the bottom end of the top plate (305) via a bearing; and two ends of the first threaded rod (302) are engraved with two sections of threads in opposite directions.

3. A stretching device for a car muffler housing according to claim 2, characterized in that: The shell stretching mechanism (3) comprises a first baffle (306), a second baffle (307), a first sliding sleeve (308) and a push rod (309); the first baffle (306) is fixedly sleeved in the middle of the two support rods (304) by means of bolts; the first baffle (306) is movably sleeved in the middle of the first threaded rod (302); there are two second baffles (307) which are respectively fixedly sleeved on the two support rods (304) by means of bolts, and are respectively located in the middle of the placement platform (301) and the first baffle (306), and in the middle of the first baffle (306) and the top plate (305), and are respectively The push rod (309) is movably sleeved between two sections of threads at both ends of the first threaded rod (302). There are two sets of the first sleeves (308) and they are movably sleeved on the two ends of the first threaded rod (302) through threads and are respectively located on two sections of threads in opposite directions. There are two sets of the push rod (309) on each first sleeve (308), and one end close to the first threaded rod (302) is movably installed in the middle of the front and rear sides of the first sleeve (308) through a rotating shaft, and one end away from the first threaded rod (302) is movably installed on one side of the two stretching cylinders (310) close to the first threaded rod (302) through a rotating shaft.

4. A stretching device for a car muffler housing according to claim 3, characterized in that: The shell stretching mechanism (3) comprises a heating tube (311), a translation groove (312) and a movable groove (313); there are two heating tubes (311) and they are respectively fixedly installed inside two stretching tubes (310) by bolts; there are two movable grooves (313) and they are respectively opened in the middle of the left and right sides of the top of the placement platform (301); there are two groups of translation grooves (312) and they are respectively opened in the left and right sides of the top of the placement platform (301) and are respectively located in the front and rear sides of the two movable grooves (313); the bottom ends of the two stretching tubes (310) are respectively installed in the two groups of translation grooves (312) by insertion and movement; the bottom ends of the heating tubes (311) are respectively installed in the two movable grooves (313) by insertion and movement.

5. A stretching device for automobile muffler housing according to claim 4, characterized in that: The embracing mechanism (4) comprises a support plate (401), a second threaded rod (402), a limiting rod (403) and a second sliding sleeve (404); the support plates (401) are in total two groups and are respectively fixedly mounted inside the two housings (2) by means of bolts; the second threaded rods (402) are in total two and are respectively movably mounted in the middle of the two groups of support plates (401) by means of bearings; the two ends of the second threaded rod (402) are respectively movably mounted at the top and bottom ends inside the two housings (2) by means of bearings; the limiting rods (403) are in total two groups and two in each group and are respectively fixedly mounted inside the two housings (2) by means of bolts and are fixedly mounted in the two support plates (401) by means of insertion and are respectively located at the front and rear ends of the two second threaded rods (402); the second sliding sleeves (404) are in total two groups and are respectively movably sleeved on the two ends of the two second threaded rods (402) by means of threads.

6. A stretching device for automobile muffler housing according to claim 5, characterized in that: The embracing mechanism (4) comprises a connecting seat (405), a push plate (406), a connecting frame (407) and a first synchronous belt (409); the connecting seat (405) is fixedly mounted in the middle of a side close to the stretching cylinder (310) by means of bolts; there are two push plates (406) on each connecting seat (405) and they are respectively mounted on the front and rear sides of the connecting seat (405) by means of rotating shafts; there are two connecting frames (407) and they are respectively mounted on the left and right groups of push plates (406) by means of rotating shafts. At one end of the stretching cylinder (310), the two embracing molds (408) are fixedly mounted on one end of the two connecting frames (407) close to the stretching cylinder (310) by bolts, there are two first synchronous belts (409) and one end close to the first threaded rod (302) is movably sleeved on the output shaft at the bottom end of the dual-axis motor (303), and the ends of the two first synchronous belts (409) away from the first threaded rod (302) are movably sleeved on one end of the two second threaded rods (402) located in the bottom box (1).

7. A stretching device for automobile muffler housing according to claim 6, characterized in that: The edge stretching mechanism (5) comprises a telescopic box (501), a telescopic gear (502), a gear shaft (503), a telescopic rod (504) and a telescopic rack (505). The telescopic boxes (501) are four in total and are respectively fixedly mounted on the front and rear sides of two connecting frames (407) by bolts. The telescopic gear (502) is movably mounted in the middle of the telescopic box (501) by bearings. The gear shaft (503) is movably mounted in the middle of the telescopic box (501) and the connecting frame (407) by insertion. The telescopic gear (502) is fixedly sleeved on the gear shaft (504) by bolts. 503), one end of the telescopic rod (504) close to the lifting plate (506) is fixedly connected to the lifting plate (506) by bolts, and one end of the telescopic rod (504) away from the lifting plate (506) is installed in the telescopic box (501) by insertion, and there are two telescopic racks (505) in each telescopic box (501), which are respectively located on both sides of the telescopic gear (502) and are connected to the telescopic gear (502) by meshing, and one end of the telescopic rack (505) located outside the telescopic box (501) is fixedly connected to the adjacent lifting plate (506) by bolts.

8. A stretching device for a car muffler housing according to claim 7, characterized in that: The edge stretching mechanism (5) comprises a worm wheel (508), a worm (509), a bump (510), a driving motor (511) and a rotating sleeve (512); the worm wheels (508) are two in total and are respectively fixedly sleeved on one end of the two gear shafts (503) located at the front side and located outside the telescopic box (501) by means of bolts; the worm wheels (509) are two in total and one end close to the worm wheel (508) is movably mounted on a side of the two telescopic boxes (501) located at the front side and away from the connecting frame (407) by means of a bearing; the worm wheel (509) is movably connected to the worm wheel (508) by means of meshing; the bump (510) is connected to the worm wheel (508) by means of a screw thread; The body is formed and fixedly mounted on the worm (509); the driving motor (511) is fixedly mounted on the inner left side wall of a housing (2) located on the left side by bolts; there are two rotating sleeves (512); one end of the rotating sleeve (512) located on the left end away from the stretching cylinder (310) is fixedly mounted on the output shaft of the driving motor (511) by bolts; and one end of the rotating sleeve (512) located on the right end away from the stretching cylinder (310) is movably mounted on the inner right side wall of a housing (2) at the right end by a bearing; and the two worms (509) are respectively movably mounted in the two rotating sleeves (512) by insertion.

9. A stretching device for an automobile muffler housing according to claim 8, characterized in that: The edge stretching mechanism (5) comprises a slot (513), a transmission rod (514), a synchronization rod (515) and a second synchronization belt (516). The slot (513) is formed inside the rotating sleeve (512). The protrusion (510) is movably installed in the slot (513) by insertion. There are two transmission rods (514) and they are movably installed in the middle of two connecting frames (407) through bearings. The two ends of the two transmission rods (514) are respectively fixedly connected to one end of the four gear shafts (503) close to the connecting frames (407) through bolts. The two ends of the synchronization rod (515) are respectively movably installed in the middle of the inner rear side walls of the two housings (2) through bearings. There are two second synchronization belts (516) and they are movably sleeved on one end of the two rotating sleeves (512) away from the stretching cylinder (310) and the synchronization rod (515).

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