Exhaust pipe diameter shaping device

Abstract

The utility model relates to the technical field of exhaust pipe diameter reshaping, in particular to an exhaust pipe diameter reshaping device which comprises a shell, a feeding end, a discharging end and a diameter reshaping device. The diameter-shaping and pipe-expanding mechanism main body is located on the upper portion of the interior of the shell, the upper end face of the diameter-shaping and pipe-expanding mechanism main body is fixedly connected with the output end of a first electric push rod, and the diameter-shaping and pipe-expanding mechanism main body is used for shaping the diameter of the exhaust pipe; and the alignment feeding device is arranged on the side, close to the feeding end, of the interior of the shell and used for feeding the exhaust pipe. The exhaust pipes are placed on the placing plate, the placing plate can be used for aligning the exhaust pipes in advance, then the aligning and feeding device is used for pushing the placing plate to move horizontally, and therefore the exhaust pipes are pushed to the position under the diameter-shaping and pipe-expanding mechanism body, rapid alignment and feeding of the exhaust pipes are achieved, time is saved, and the production efficiency is improved. And the diameter shaping efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust pipe diametric adjustment, in particular to an exhaust pipe diametric adjustment device. Background Art

[0002] The exhaust pipe is a part of the engine exhaust system. The exhaust system mainly includes exhaust manifold, exhaust pipe and muffler, which are used to discharge the exhaust gas. In the process of exhaust pipe production, in order to facilitate the installation of the exhaust pipe, both ends of the exhaust pipe need to be sized so that both ends of the exhaust pipe meet the installation conditions. In the sizing process, an exhaust pipe sizing device is needed.

[0003] However, when the existing exhaust pipe sizing device is in use, in order to improve the efficiency of sizing, multiple exhaust pipes need to be sizing at the same time each time. The sizing mechanism is pushed downward to be inserted into one end of the exhaust pipe, and the end is stretched to a specified inner diameter and then stopped, thereby achieving sizing of the exhaust pipe. However, since most of the multiple sizing mechanisms are arranged on the same driving member, the multiple sizing mechanisms can move synchronously, which results in the upper end faces of the fixed exhaust pipes being on the same horizontal line. When loading, the user needs to do it manually, and the exhaust pipes need to be aligned, which takes a long time to load, and the exhaust pipes cannot be quickly aligned and loaded, resulting in low sizing efficiency. Utility Model Content

[0004] The utility model aims to solve the problem of low sizing efficiency caused by the inability of the existing exhaust pipe sizing device to quickly align and load the exhaust pipe.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An exhaust pipe calibrating device, comprising:

[0007] A shell, wherein one end of the shell surface with a notch is a feeding end;

[0008] A main body of the pipe-adjusting and expanding mechanism, wherein the main body of the pipe-adjusting and expanding mechanism is located above the interior of the shell, and the upper end surface of the main body of the pipe-adjusting and expanding mechanism is fixedly connected to the output end of the first electric push rod, and is used for adjusting the diameter of the exhaust pipe;

[0009] The alignment loading device is arranged at one side of the shell body near the loading end and is used to load the exhaust pipe; the alignment loading device comprises: a placement plate, which is arranged at the loading end and is used to place the exhaust pipe.

[0010] Preferably, the alignment and feeding device further comprises:

[0011] A second electric push rod, wherein an output end of the second electric push rod is fixedly connected to the bottom end of the placement plate;

[0012] A moving rod is arranged below the second electric push rod and is fixedly connected to the bottom end of the second electric push rod; a first cylindrical pin is arranged on the surface of the moving rod;

[0013] A limiting rod passes through a corresponding position of the moving rod and is slidably connected to the moving rod; one end of the limiting rod is fixedly connected to the housing;

[0014] A rotating rod, wherein a first sliding groove and a second sliding groove are provided on the surface of the rotating rod, and the rotating rod is slidably connected to the first cylindrical pin through the first sliding groove; and the bottom end of the rotating rod is rotatably connected to the housing;

[0015] The moving part is composed of a cross bar, a second cylindrical pin, a vertical bar and a third cylindrical pin, one end of the cross bar is fixedly connected to the bottom end of the vertical bar; the surface of the cross bar is fixedly connected to the third cylindrical pin, the second cylindrical pin is arranged in the second slide groove, and is slidably connected to the rotating rod through the second slide groove; the surface of the vertical bar is fixedly connected to the third cylindrical pin;

[0016] A slider is fixedly connected to the other end of the cross bar, and the bottom end of the slider is slidably connected to the housing;

[0017] An eccentric wheel, wherein a ring groove is formed on the surface of the eccentric wheel, and the eccentric wheel is slidably connected with the third cylindrical pin through the ring groove;

[0018] A first motor, wherein an output end of the first motor is fixedly connected to the axis of the eccentric wheel, and is used for driving the eccentric wheel to rotate.

[0019] Preferably, the upper end surface of the placement plate is provided with a plurality of grooves, the inner diameter of the grooves being slightly larger than the outer diameter of the exhaust pipe, for aligning and fixing the exhaust pipe.

[0020] Preferably, it further comprises: a fixing device; the fixing device is arranged directly below the main body of the full-diameter pipe expansion mechanism and is used to fix the exhaust pipe.

[0021] Preferably, the fixing device comprises:

[0022] Fixed box;

[0023] A double-ended threaded rod, both ends of which pass through corresponding positions of the fixed box and are rotatably connected to the fixed box;

[0024] A second motor, an output end of which is fixedly connected to one end of the double-threaded rod, and is used to drive the double-threaded rod to rotate;

[0025] Two sets of connection blocks are arranged at both ends of the surface of the double-threaded rod and are threadedly connected to the double-threaded rod;

[0026] Two groups of fixing members, each group of fixing members is fixedly connected to the connecting block.

[0027] Preferably, the threads on both side surfaces of the double-start threaded rod are arranged in opposite directions.

[0028] Preferably, a limiting groove is provided on the surface of the fixing member to improve the fixing ability of the exhaust pipe.

[0029] Preferably, it further comprises: a buffer block; the buffer block is arranged directly below the main body of the full-diameter pipe expansion mechanism and is used to buffer the fallen exhaust pipe.

[0030] Preferably, it further comprises: a flipping device; the flipping device is arranged at the lower part of the shell and located at a side away from the feeding end, and is used to flip the exhaust pipe.

[0031] Preferably, the turning device comprises:

[0032] A bevel gear set, consisting of a first bevel gear and a second bevel gear, wherein the axis of the first bevel gear is fixedly connected to the fixed box, and the edge of the first bevel gear is meshedly connected to the edge of the second bevel gear;

[0033] A rotating disk, coaxially arranged with the second bevel gear;

[0034] A plurality of groups of protrusions are evenly distributed on the lower edge of the turntable;

[0035] A sheave, wherein a slideway is provided on the surface of the sheave and the sheave is slidably connected with a group of the protrusions through the slideway;

[0036] A third motor, wherein an output end of the third motor is fixedly connected to the axis of the groove wheel, and is used for driving the groove wheel to rotate.

[0037] The beneficial effect proposed by the utility model is that by placing the exhaust pipe on the placement plate, the exhaust pipe can be aligned in advance using the placement plate, and then the placement plate is pushed to move horizontally using the alignment and loading device, so that the exhaust pipe is pushed to the bottom of the main body of the straightening tube expansion mechanism, so as to achieve rapid alignment of the exhaust pipe and loading, save time and improve the efficiency of straightening. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of the utility model;

[0039] Figure 2 for Figure 1 Schematic diagram of the cross-section plane at the BB line;

[0040] Figure 3 for Figure 2 A schematic diagram of the top view of the middle part connection structure;

[0041] Figure 4 for Figure 2 Schematic diagram of the connection structure at A in the middle;

[0042] Figure 5 for Figure 2 A three-dimensional enlarged schematic diagram of the middle part connection structure.

[0043] In the figure: 1, shell, 2, diameter expansion mechanism body, 3, first electric push rod, 4, buffer block, 5, placement plate, 6, exhaust pipe, 7, second electric push rod, 8, moving rod, 9, rotating rod, 10, moving part, 11, slider, 12, eccentric wheel, 13, first motor, 14, limit rod, 15, fixed box, 16, double-headed threaded rod, 17, second motor, 18, connecting block, 19, fixing part, 20, bevel gear set, 21, turntable, 22, bump, 23, groove wheel, 24, third motor. DETAILED DESCRIPTION

[0044] The utility model is further described below in conjunction with the accompanying drawings: Example

[0045] See also Figure 1-5 In this embodiment: an exhaust pipe sizing device includes: a shell 1, a sizing and expanding mechanism body 2 and an alignment and feeding device.

[0046] In this embodiment, the end of the shell 1 with a notch is the feeding end, and the exhaust pipe 6 enters the shell 1 through the feeding end; the main body 2 of the diameter-adjusting and expanding mechanism is located above the interior of the shell 1, and the upper end surface of the main body 2 of the diameter-adjusting and expanding mechanism is fixedly connected to the output end of the first electric push rod 3, which is used to adjust the diameter of the exhaust pipe 6.

[0047] In this embodiment, the model of the first electric push rod 3 is selected according to actual needs and meets the working conditions; the main body 2 of the diameter adjustment and expansion mechanism includes a plurality of expansion gun heads for diameter adjustment; the first electric push rod 3 can be adjusted so that the output end of the first electric push rod 3 extends, thereby pushing the main body 2 of the diameter adjustment and expansion mechanism to move downward, so that the plurality of expansion gun heads move at the same time and are inserted into the exhaust pipe 6 to expand the pipe, thereby achieving diameter adjustment of the exhaust pipe 6.

[0048] The alignment loading device is arranged at one side of the shell 1 near the loading end, and is used to load the exhaust pipe 6; the alignment loading device includes: a placement plate 5, which is arranged at the loading end and is used to place the exhaust pipe 6.

[0049] In this embodiment, the alignment and loading device pushes the placement plate 5 to push the exhaust pipe 6 located above the placement plate 5 to the bottom of the diameter adjustment and expansion mechanism body 2 to adjust the diameter.

[0050] like Figure 2 and Figure 4 As shown, the alignment and feeding device also includes: a second electric push rod 7, a moving rod 8, a limiting rod 14, a rotating rod 9, a moving member 10, a sliding block 11, an eccentric wheel 12 and a first motor 13.

[0051] Among them, the output end of the second electric push rod 7 is fixedly connected to the bottom end of the placement plate 5. The model of the second electric push rod 7 is selected according to actual needs and meets the working conditions. The placement plate 5 is pushed to move vertically by the extension and retraction of the output end of the second electric push rod 7; the moving rod 8 is arranged below the second electric push rod 7 and is fixedly connected to the bottom end of the second electric push rod 7.

[0052] In this embodiment, the moving rod 8 can drive the second electric push rod 7 to move horizontally.

[0053] A first cylindrical pin is disposed on the surface of the moving rod 8 ; the limiting rod 14 passes through the corresponding position of the moving rod 8 and is slidably connected to the moving rod 8 ; one end of the limiting rod 14 is fixedly connected to the housing 1 .

[0054] In this embodiment, the limiting rod 14 can limit the moving rod 8 to move only horizontally.

[0055] A first sliding groove and a second sliding groove are provided on the surface of the rotating rod 9, and the rotating rod 9 is slidably connected to the first cylindrical pin through the first sliding groove.

[0056] In this embodiment, when the rotating rod 9 rotates, the moving rod 8 moves horizontally through the sliding between the first sliding groove and the first cylindrical pin.

[0057] The bottom end of the rotating rod 9 is rotatably connected to the shell 1; the moving part 10 is composed of a cross bar, a second cylindrical pin, a vertical rod and a third cylindrical pin, one end of the cross bar is fixedly connected to the bottom end of the vertical rod; the surface of the cross bar is fixedly connected to the third cylindrical pin, the second cylindrical pin is arranged in the second slide groove, and is slidably connected to the rotating rod 9 through the second slide groove.

[0058] In this embodiment, when the moving member 10 moves horizontally, the sliding between the second cylindrical pin and the second sliding groove causes the rotating rod 9 to swing along the connection with the housing 1 .

[0059] The surface of the vertical rod is fixedly connected to the third cylindrical pin; the slider 11 is fixedly connected to the other end of the cross rod, and the bottom end of the slider 11 is slidably connected to the housing 1.

[0060] In this embodiment, the slider 11 can limit the moving member 10 to move only horizontally.

[0061] An annular groove is formed on the surface of the eccentric wheel 12, and is slidably connected to the third cylindrical pin through the annular groove; the output end of the first motor 13 is fixedly connected to the axis of the eccentric wheel 12, so as to drive the eccentric wheel 12 to rotate.

[0062] In this embodiment, the model of the first motor 13 is selected according to actual needs and meets the working conditions; when the eccentric wheel 12 rotates, the movable member 10 can move horizontally through the sliding between the annular groove and the third cylindrical pin.

[0063] The upper end surface of the placement plate 5 is provided with multiple groups of grooves, the inner diameter of the grooves is slightly larger than the outer diameter of the exhaust pipe 6, and is used to align and fix the exhaust pipe 6. By inserting the exhaust pipe 6 into the grooves, the position of the exhaust pipe 6 can be restricted so that the exhaust pipe 6 is aligned.

[0064] When loading, the user inserts the exhaust pipe 6 vertically into the corresponding groove; the placement plate 5 can align the exhaust pipe 6 using the groove; then start the first motor 13, and the output end of the first motor 13 drives the eccentric wheel 12 to rotate; the eccentric wheel 12 will slide between the annular groove and the third cylindrical pin, so that the moving part 10 moves horizontally; the moving part 10 slides between the second cylindrical pin and the second slide groove, so that the rotating rod 9 swings along the connection with the shell 1; the rotating rod 9 slides between the first slide groove and the first cylindrical pin, so that the moving rod 8 moves horizontally; since the first slide groove is far away from the rotation axis, the moving rod 8 moves farther horizontally; the moving rod 8 moves under the restriction of the limit rod 14, and drives the placement plate 5 to move through the second electric push rod 7; the placement plate 5 will push the exhaust pipe 6 to the bottom of the main body 2 of the diameter expansion mechanism for diameter adjustment; it can quickly align the exhaust pipe 6 and load the material, saving time and improving the efficiency of diameter adjustment.

[0065] The exhaust pipe sizing device further comprises: a fixing device; the fixing device is arranged directly below the main body 2 of the sizing and expanding mechanism, and is used to fix the exhaust pipe 6.

[0066] In this embodiment, Figure 2 and Figure 3 As shown, the fixing device includes: a fixing box 15 , a double-headed threaded rod 16 , a second motor 17 , two groups of connecting blocks 18 and two groups of fixing members 19 .

[0067] Specifically, both ends of the double-headed threaded rod 16 pass through the corresponding positions of the fixed box 15 and are rotatably connected to the fixed box 15. The fixed box 15 can support the rotation of the double-headed threaded rod 16; the output end of the second motor 17 is fixedly connected to one end of the double-headed threaded rod 16, and is used to drive the double-headed threaded rod 16 to rotate.

[0068] In this embodiment, the model of the second motor 17 is selected according to actual needs as long as it meets the working conditions.

[0069] Two groups of connection blocks 18 are disposed at two ends of the surface of the double-threaded rod 16 and are threadedly connected to the double-threaded rod 16 ; each group of fixing members 19 is fixedly connected to the connection blocks 18 .

[0070] The threads on both sides of the double-threaded rod 16 are arranged in opposite directions, so that the two groups of connecting blocks 18 move in opposite directions.

[0071] A limiting groove is provided on the surface of the fixing member 19 , and the limiting groove may be a “V”-shaped groove, so as to improve the fixing ability of the exhaust pipe 6 .

[0072] When the exhaust pipe 6 needs to be fixed, the second motor 17 is started, and the output end of the second motor 17 drives the double-headed threaded rod 16 to rotate; the double-headed threaded rod 16 uses the opposite thread directions on both sides to make the two groups of connecting blocks 18 move toward the middle at the same time; the connecting block 18 drives the fixing piece 19 to move, and the two groups of fixing pieces 19 cooperate to clamp the exhaust pipe 6 in the "V"-shaped groove to fix the exhaust pipe 6.

[0073] The exhaust pipe sizing device also includes: a buffer block 4; the buffer block 4 is arranged directly below the main body 2 of the sizing and expanding mechanism, and is used to buffer the fallen exhaust pipe 6. At the same time, the buffer block 4 can also control the moving direction of the exhaust pipe 6 and send the exhaust pipe 6 out of the shell 1.

[0074] When sizing, both ends of the exhaust pipe 6 need to be sizing, and after sizing one end, the exhaust pipe 6 needs to be disassembled and re-fixed before the other end can be sizing, which is quite time-consuming.

[0075] To solve the above problem, this embodiment proposes an implementation method, the exhaust pipe sizing device also includes: a flipping device; the flipping device is arranged at the lower part of the shell 1 and is located on the side away from the feeding end, and is used to flip the exhaust pipe 6.

[0076] In this embodiment, Figure 2 and Figure 5 As shown, the turning device includes: a bevel gear set 20 , a rotating disk 21 , multiple groups of protrusions 22 , a groove wheel 23 and a third motor 24 .

[0077] The bevel gear set 20 is composed of a first bevel gear and a second bevel gear. The axis of the first bevel gear is fixedly connected to the fixing box 15, and the edge of the first bevel gear is meshedly connected to the edge of the second bevel gear.

[0078] In this embodiment, the first bevel gear and the second bevel gear have the same size, and the first bevel gear can drive the fixing box 15 to rotate, thereby driving the exhaust pipe 6 to flip.

[0079] The turntable 21 is coaxially arranged with the second bevel gear; a plurality of groups of protrusions 22 are evenly distributed on the lower edge of the turntable 21; a slideway is provided on the surface of the groove wheel 23, and is slidably connected with a group of protrusions 22 through the slideway, and the slideway is spirally wound on the surface of the groove wheel 23.

[0080] In this embodiment, when the groove wheel 23 rotates, the spiral slideway is used to make the protrusion 22 move in a circle, thereby driving the rotating disk 21 to rotate.

[0081] The output end of the third motor 24 is fixedly connected to the axis of the groove wheel 23 to drive the groove wheel 23 to rotate. The model of the third motor 24 is selected according to actual needs and meets the working conditions.

[0082] When the exhaust pipe 6 needs to be flipped, the third motor 24 is started, and the output end of the third motor 24 drives the groove wheel 23 to rotate; the groove wheel 23 uses the spiral slide to move the protrusion 22 in a circle, thereby driving the turntable 21 to rotate; each time the groove wheel 23 rotates one circle, the turntable 21 intermittently rotates one eighth of a circle; at this time, the turntable 21 drives the bevel gear set 20 to rotate; the bevel gear set 20 drives the exhaust pipe 6 to rotate through the entire fixing device, thereby realizing the flipping of the exhaust pipe 6; it is no longer necessary to re-fix the exhaust pipe 6 in order to adjust the diameter of the other end of the exhaust pipe 6, which saves time.

[0083] Working principle:

[0084] When the exhaust pipe sizing device is in use, the user inserts the exhaust pipe 6 vertically into the corresponding groove; the placement plate 5 can align the exhaust pipe 6 using the groove; then the first motor 13 is started, and the output end of the first motor 13 drives the eccentric wheel 12 to rotate; the eccentric wheel 12 will slide between the annular groove and the third cylindrical pin, so that the moving member 10 moves horizontally; the moving member 10 slides between the second cylindrical pin and the second slide groove, so that the rotating rod 9 swings along the connection with the shell 1; the rotating rod 9 slides between the first slide groove and the first cylindrical pin, so that the moving rod 8 moves horizontally; since the first slide groove is far away from the rotation axis, the moving rod 8 moves farther horizontally; the moving rod 8 moves under the restriction of the limit rod 14, and drives the placement plate 5 to move through the second electric push rod 7; the placement plate 5 will push the exhaust pipe 6 to the bottom of the main body 2 of the sizing and expanding mechanism for sizing; it can quickly align the exhaust pipe 6 and load the material, saving time and improving the efficiency of sizing.

[0085] At this time, the second motor 17 is started, and the output end of the second motor 17 drives the double-headed threaded rod 16 to rotate; the double-headed threaded rod 16 uses the opposite thread directions on both sides to make the two groups of connecting blocks 18 move toward the middle at the same time; the connecting block 18 drives the fixing piece 19 to move, and the two groups of fixing pieces 19 cooperate together to clamp the exhaust pipe 6 in the "V"-shaped groove to fix the exhaust pipe 6.

[0086] Subsequently, the first electric push rod 3 is adjusted so that the output end of the first electric push rod 3 is extended, thereby pushing the diameter adjustment and expansion mechanism body 2 to move downward; and multiple expansion gun heads are inserted into the top ends of the corresponding exhaust pipes 6 to achieve diameter adjustment of the exhaust pipes 6.

[0087] When the exhaust pipe 6 needs to be flipped, the third motor 24 is started, and the output end of the third motor 24 drives the groove wheel 23 to rotate; the groove wheel 23 uses the spiral slide to move the protrusion 22 in a circle, thereby driving the turntable 21 to rotate; each time the groove wheel 23 rotates one circle, the turntable 21 intermittently rotates one eighth of a circle; at this time, the turntable 21 drives the bevel gear set 20 to rotate; the bevel gear set 20 drives the exhaust pipe 6 to rotate through the entire fixing device, thereby realizing the flipping of the exhaust pipe 6; it is no longer necessary to re-fix the exhaust pipe 6 in order to adjust the diameter of the other end of the exhaust pipe 6, which saves time and completes the use of this device.

[0088] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. An exhaust pipe sizing device, characterized in that: include: A shell (1), wherein one end of the shell (1) having a notch formed on its surface is a feeding end; A main body (2) of the pipe-scaling and expanding mechanism, the main body (2) of the pipe-scaling and expanding mechanism being located above the interior of the housing (1), and the upper end surface of the main body (2) of the pipe-scaling and expanding mechanism being fixedly connected to the output end of the first electric push rod (3), and being used for scal-ing the exhaust pipe (6); An alignment loading device is arranged inside the housing (1) on one side close to the loading end and is used to load the exhaust pipe (6); The alignment and loading device comprises: a placement plate (5), the placement plate (5) being arranged at the loading end and being used for placing the exhaust pipe (6).

2. The exhaust pipe calibrating device according to claim 1, characterized in that: The alignment and feeding device also includes: A second electric push rod (7), the output end of the second electric push rod (7) being fixedly connected to the bottom end of the placement plate (5); A moving rod (8) is arranged below the second electric push rod (7) and is fixedly connected to the bottom end of the second electric push rod (7); a first cylindrical pin is arranged on the surface of the moving rod (8); A limit rod (14) passes through a corresponding position of the moving rod (8) and is slidably connected to the moving rod (8); one end of the limit rod (14) is fixedly connected to the housing (1); A rotating rod (9), wherein a first sliding groove and a second sliding groove are formed on the surface of the rotating rod (9), and the rotating rod (9) is slidably connected to the first cylindrical pin via the first sliding groove; and the bottom end of the rotating rod (9) is rotatably connected to the housing (1); The moving member (10) is composed of a cross bar, a second cylindrical pin, a vertical bar and a third cylindrical pin, one end of the cross bar is fixedly connected to the bottom end of the vertical bar; the surface of the cross bar is fixedly connected to the third cylindrical pin, the second cylindrical pin is arranged in the second slide groove and is slidably connected to the rotating rod (9) through the second slide groove; the surface of the vertical bar is fixedly connected to the third cylindrical pin; A slider (11) is fixedly connected to the other end of the crossbar, and a bottom end of the slider (11) is slidably connected to the housing (1); An eccentric wheel (12), wherein a ring groove is formed on the surface of the eccentric wheel (12), and the eccentric wheel (12) is slidably connected to the third cylindrical pin via the ring groove; A first motor (13), wherein an output end of the first motor (13) is fixedly connected to the axis of the eccentric wheel (12) and is used to drive the eccentric wheel (12) to rotate.

3. The exhaust pipe calibrating device according to claim 1, characterized in that: The upper end surface of the placement plate (5) is provided with a plurality of groups of grooves, the inner diameter of the grooves being slightly larger than the outer diameter of the exhaust pipe (6), and being used for aligning and fixing the exhaust pipe (6).

4. The exhaust pipe calibrating device according to claim 1, characterized in that: Also includes: A fixing device; the fixing device is arranged directly below the main body (2) of the full-diameter pipe expansion mechanism and is used to fix the exhaust pipe (6).

5. The exhaust pipe calibrating device according to claim 4, characterized in that: The fixing device comprises: Fixed box (15); a double-ended threaded rod (16), wherein both ends of the double-ended threaded rod (16) pass through corresponding positions of the fixed box (15) and are rotatably connected to the fixed box (15); a second motor (17), wherein an output end of the second motor (17) is fixedly connected to one end of the double-ended threaded rod (16) and is used to drive the double-ended threaded rod (16) to rotate; Two groups of connection blocks (18) are arranged at two ends of the surface of the double-ended threaded rod (16) and are threadedly connected to the double-ended threaded rod (16); Two groups of fixing members (19), each group of fixing members (19) is fixedly connected to the connecting block (18).

6. The exhaust pipe calibrating device according to claim 5, characterized in that: The threads on the two side surfaces of the double-ended threaded rod (16) are arranged in opposite directions.

7. The exhaust pipe calibrating device according to claim 5, characterized in that: A limiting groove is provided on the surface of the fixing member (19) to improve the fixing capability of the exhaust pipe (6).

8. The exhaust pipe calibrating device according to claim 1, characterized in that: Also includes: A buffer block (4); the buffer block (4) is arranged directly below the main body (2) of the full-diameter pipe expansion mechanism and is used to buffer a fallen exhaust pipe (6).

9. The exhaust pipe calibrating device according to claim 5, characterized in that: Also includes: A turning device; the turning device is arranged at the lower part of the shell (1) and is located on a side away from the feeding end, and is used to turn the exhaust pipe (6).

10. The exhaust pipe calibrating device according to claim 9, characterized in that: The turning device comprises: A bevel gear set (20) consisting of a first bevel gear and a second bevel gear, wherein the axis of the first bevel gear is fixedly connected to the fixed box (15), and the edge of the first bevel gear is meshingly connected to the edge of the second bevel gear; A rotating disk (21) is coaxially arranged with the second bevel gear; A plurality of groups of protrusions (22) are evenly distributed on the lower edge of the rotating disk (21); A groove wheel (23), wherein a slideway is provided on the surface of the groove wheel (23), and the groove wheel (23) is slidably connected to a group of the protrusions (22) via the slideway; A third motor (24), wherein an output end of the third motor (24) is fixedly connected to the axis of the groove wheel (23) and is used to drive the groove wheel (23) to rotate.

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