An automatic detection device for exhaust pipe size

Abstract

The present invention relates to the field of exhaust pipe detection technology, specifically to an automated detection device for exhaust pipe size, which solves the problem that the existing detection of automobile exhaust pipes mainly relies on manual detection, and manually operates tools such as pins and go / no-go gauges to determine whether the position and flatness of the workpiece are qualified. The detection is time-consuming and labor-intensive, and the detection data cannot be digitized. It also requires frequent replacement of fixtures and training of personnel. The device comprises an installation support box, a main body positioning mechanism is installed in the middle of the upper end surface of the installation support box, a left oxygen sensor detection station is installed on the left side of the main body positioning mechanism, a bellows flange position detection mechanism is installed on the left side of the left oxygen sensor detection station, and a bellows flange positioning frame is installed behind the left oxygen sensor detection station. The present invention effectively improves detection efficiency and detection accuracy by automatically positioning the exhaust pipe and performing multiple simultaneous detections, and facilitates the acquisition and storage of exhaust pipe detection data.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust pipe detection, and in particular to an automatic detection device for exhaust pipe dimensions. Background Art

[0002] The exhaust pipe is part of the engine's exhaust system, which primarily includes the exhaust manifold, exhaust pipe, and muffler. A three-way catalytic converter (CATG) is also typically installed to control engine emissions. The exhaust pipe typically utilizes a double-layer bellows structure, wrapped in a steel mesh sleeve. Straight-edge sections and retaining rings are installed at each end for secure support. The bellows may be equipped with expansion joints or mesh sleeves to enhance system flexibility and efficiency. Various exhaust pipe parameters require testing during the automotive production and assembly process.

[0003] The existing inspection of automobile exhaust pipes mainly relies on manual inspection. The position and flatness of the workpiece are judged by manually operating tools such as pins and go / no-go gauges. The inspection is time-consuming and labor-intensive, the inspection data cannot be digitized, and frequent fixture replacement and personnel training are required. Therefore, this does not meet the existing needs. In response to this, we proposed an automated inspection equipment for exhaust pipe dimensions. Summary of the Invention

[0004] The purpose of the present invention is to provide an automated detection equipment for exhaust pipe size to solve the problems raised in the above background technology that the existing inspection of automobile exhaust pipes mainly relies on manual inspection, and manually operates tools such as pins and go / no-go gauges to judge whether the position and flatness of the workpiece are qualified. The inspection is time-consuming and labor-intensive, the inspection data cannot be digitized, and frequent replacement of fixtures and training of personnel are required.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an automated detection device for exhaust pipe size, comprising an installation support box, a main body positioning mechanism installed in the middle of the upper end surface of the installation support box, a left oxygen sensor detection station installed on the left side of the main body positioning mechanism, a bellows flange position detection mechanism installed on the left side of the left oxygen sensor detection station, a bellows flange positioning frame installed behind the left oxygen sensor detection station, a bellows flatness detection mechanism installed on the left side of the bellows flange position detection mechanism, a right oxygen sensor detection station installed on the right side of the main body positioning mechanism, an auxiliary support mechanism installed at the rear end of the main body positioning mechanism, a rear assembly surface detection mechanism installed behind the auxiliary support mechanism, and a welding flange detection mechanism installed on the outside of the rear assembly surface detection mechanism.

[0006] Preferably, an exhaust pipe is provided at the upper end of the main body positioning mechanism, and the main body positioning mechanism includes a support frame, a calibration block is fixedly installed in the middle of the upper end surface of the support frame, the upper end of the support frame is rotatably connected to a pressure claw, the bottom end of the exhaust pipe is fixedly connected to the support frame through a plurality of pressure claws, the upper end surface of the support frame is provided with a plurality of positioning pins, two main flange mounting block position detection mechanisms are installed on the inner side of the support frame, a flange flatness detection station is installed between the two main flange mounting block position detection mechanisms, and the main flange mounting block position detection mechanism includes a cylinder mounting frame, the support frame is fixedly connected to the two cylinder mounting frames, a first cylinder is fixedly installed at the bottom end of the cylinder mounting frame, a first detection pin is fixedly installed at the output end of the first cylinder, the upper end of the first detection pin passes through the cylinder mounting frame and the support frame and is in contact with the bottom end of the exhaust pipe.

[0007] Preferably, the left oxygen sensor detection station and the right oxygen sensor detection station both include a first mounting seat, a first displacement sensor is fixedly mounted on the upper end of the first mounting seat, a detection shaft is slidably connected to one side of the first displacement sensor, the detection shaft is slidably connected to the first mounting seat, a second cylinder is fixedly mounted on one end of the detection shaft, the second cylinder is fixedly connected to the first mounting seat, a zeroing pin is installed between the detection shaft and the output end of the second cylinder, a contour detection block is slidably mounted on the other end of the detection shaft, and a spring is provided between the contour detection block and the detection shaft.

[0008] Preferably, the bellows flange position detection mechanism includes a second mounting seat, a fourth cylinder is fixedly mounted on the upper end of the second mounting seat, a linear guide is fixedly mounted on the output end of the fourth cylinder, the linear guide is slidingly connected to the upper end of the second mounting seat, two third cylinders are fixedly mounted on one end of the linear guide, a transmission frame is fixedly mounted on the output ends of the two third cylinders, a second detection pin is slidingly connected to the inner side of the upper end of the transmission frame, and the second detection pin is connected to the transmission frame through a spring.

[0009] Preferably, the rear assembly surface detection mechanism includes a third mounting seat, a fifth cylinder is fixedly mounted on the upper end of the third mounting seat, a linear pneumatic guide rail is fixedly mounted on the output end of the fifth cylinder, a second displacement sensor is fixedly mounted on the rear end of the linear pneumatic guide rail, a first connecting seat is fixedly mounted on the upper end surface of the linear pneumatic guide rail, the second displacement sensor is slidably connected to the first connecting seat, an assembly contour detection plate is fixedly mounted on the upper end surface of the first connecting seat, a third detection pin is slidably connected to the inner side of the assembly contour detection plate, and the rear end of the third detection pin passes through the assembly contour detection plate and is connected to the first connecting seat through a spring.

[0010] Preferably, the welding flange detection mechanism includes a fourth mounting seat, a sixth cylinder is fixedly mounted on the upper end of the fourth mounting seat, a seventh cylinder is fixedly mounted on the output end of the sixth cylinder, a second connecting seat is fixedly mounted on the output end of the seventh cylinder, a third displacement sensor is fixedly mounted on the upper end surface of the second connecting seat, a mounting hole detection rod is mounted in front of the third displacement sensor, two welding flange contour detection rods are mounted on one side of the mounting hole detection rod, the welding flange contour detection rod is slidably connected to the second connecting seat by a spring, and the mounting hole detection rod is fixedly connected to the second connecting seat.

[0011] Preferably, the flange flatness detection station and the bellows flatness detection mechanism both include an X-direction linear module, a Y-direction linear module is installed on the upper end of the X-direction module, a Z-direction cylinder is fixedly installed on the upper end of the Y-direction linear module, and a flatness detection head is fixedly installed on the output end of the Z-direction cylinder.

[0012] Preferably, the support frame, the first mounting seat, the second mounting seat, the third mounting seat, the fourth mounting seat and the bellows flange positioning frame are all fixedly connected to the upper end of the mounting support box, a bellows flange is provided on the left side of the exhaust pipe, and the upper end of the bellows flange positioning frame is inserted into the inner side of the bellows flange.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention manually places the exhaust pipe on the upper end surface of the support frame and positions and calibrates it using a calibration block. The bellows flange positioning frame facilitates positioning of the bellows flange of the exhaust pipe. The auxiliary support mechanism facilitates auxiliary support of the rear end of the exhaust pipe. The first detection pin penetrates the support frame and contacts the bottom end of the exhaust pipe to detect the position of the main flange mounting block of the exhaust pipe. The flange flatness detection station and the flatness detection head in the bellows flatness detection mechanism synchronously detect the flatness of the exhaust pipe flange and the flatness of the bellows. The detection shaft elastically supports the contour detection block via a spring, facilitating the two contour detection blocks to detect the positions of the left and right oxygen sensors of the exhaust pipe.

[0015] 2. The present invention uses two second detection pins to detect the position of the bellows flange under the elastic support of the spring through the transmission frame, and the two third detection pins contact the rear assembly surface of the exhaust pipe, and then monitor the displacement of the third detection pin through the second displacement sensor to realize the detection of the position of the rear assembly surface of the exhaust pipe by the third detection pin. At the same time, the surface assembly contour of the exhaust pipe can be detected by the assembly contour detection plate, and the second connecting seat drives the mounting hole detection rod and the welding flange contour detection rod to respectively detect the contours of the mounting hole and the welding flange of the exhaust pipe. Through the flange flatness detection station, the left oxygen sensor detection station, the bellows flatness detection mechanism, the bellows flange position detection mechanism, the rear assembly surface detection mechanism, the welding flange detection mechanism and the right oxygen sensor detection station, the various parameters of the exhaust pipe can be detected synchronously, with high detection efficiency and accuracy, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0017] Figure 2 This is a schematic diagram of the installation structure of the main body positioning mechanism of the present invention;

[0018] Figure 3 Schematic diagram of the detection of the exhaust pipe of the present invention;

[0019] Figure 4 This is a schematic diagram of the positioning support of the exhaust pipe of the present invention;

[0020] Figure 5 It is a structural diagram of the main body positioning mechanism of the present invention;

[0021] Figure 6 This is a structural diagram of the main flange mounting block position detection mechanism of the present invention;

[0022] Figure 7 This is a structural diagram of the left oxygen sensor detection station of the present invention;

[0023] Figure 8 This is a schematic structural diagram of a bellows flange position detection mechanism according to the present invention;

[0024] Figure 9 It is a structural schematic diagram of the rear assembly surface detection mechanism of the present invention;

[0025] Figure 10 It is a structural schematic diagram of the welding flange detection mechanism of the present invention.

[0026] In the figure: 1. Main body positioning mechanism; 101. Support frame; 102. Positioning pin; 103. Pressure claw; 104. Main flange mounting block position detection mechanism; 105. Calibration block; 106. First detection pin; 107. First cylinder; 108. Cylinder mounting frame; 2. Flange flatness detection station; 3. Left oxygen sensor detection station; 301. First mounting seat; 302. Second cylinder; 303. Contour detection block; 304. Detection shaft; 305. First displacement sensor; 306. Zeroing pin; 4. Bellows flange positioning frame; 5. Bellows flatness detection mechanism; 6. Bellows flange position detection mechanism; 601. Second mounting seat; 602. Third cylinder; 603. Second detection pin; 604. Linear guide rail; 605. Fourth cylinder; 7. Auxiliary support mechanism; 8. Rear assembly surface detection mechanism; 801. Third mounting seat; 802. Third detection pin; 803. Assembly contour detection plate; 804. First connecting seat; 805. Linear pneumatic guide rail; 806. Fifth cylinder; 807. Second displacement sensor; 9. Welding flange detection mechanism; 901. Fourth mounting seat; 902. Mounting hole detection rod; 903. Welding flange contour detection rod; 904. Sixth cylinder; 905. Seventh cylinder; 906. Second connecting seat; 907. Third displacement sensor; 10. Right oxygen sensor detection station; 11. Installation support box. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] See also Figures 1 to 6, an embodiment of the present invention provides: an automated detection device for exhaust pipe size, comprising an installation support box 11, a main body positioning mechanism 1 is installed in the middle of the upper end surface of the installation support box 11, an exhaust pipe is provided on the upper end of the main body positioning mechanism 1, the main body positioning mechanism 1 comprises a support frame 101, a calibration block 105 is fixedly installed in the middle of the upper end surface of the support frame 101, a pressure claw 103 is rotatably connected to the upper end of the support frame 101, the bottom end of the exhaust pipe is fixedly connected to the support frame 101 by a plurality of pressure claws 103, a plurality of positioning pins 102 are provided on the upper end surface of the support frame 101, and two main flange mounting holes are installed on the inner side of the support frame 101. The mounting block position detection mechanism 104, the main flange mounting block position detection mechanism 104 includes a cylinder mounting frame 108, a support frame 101 is fixedly connected to the two cylinder mounting frames 108, a first cylinder 107 is fixedly installed on the bottom end of the cylinder mounting frame 108, and a first detection pin 106 is fixedly installed on the output end of the first cylinder 107, the upper end of the first detection pin 106 passes through the cylinder mounting frame 108 and the support frame 101 and is in contact with the bottom end of the exhaust pipe, the first cylinder 107 drives the first detection pin 106 to pass through the support frame 101 and contact with the bottom end of the exhaust pipe and detects the position of the main flange mounting block of the exhaust pipe.

[0029] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 7 The left side of the main body positioning mechanism 1 is equipped with a left oxygen sensor detection station 3, and the right side of the main body positioning mechanism 1 is equipped with a right oxygen sensor detection station 10. The left oxygen sensor detection station 3 and the right oxygen sensor detection station 10 both include a first mounting seat 301. A first displacement sensor 305 is fixedly installed on the upper end of the first mounting seat 301. A detection shaft 304 is slidably connected to one side of the first displacement sensor 305. The detection shaft 304 is slidably connected to the first mounting seat 301. A second cylinder 302 is fixedly installed on one end of the detection shaft 304. The second cylinder 302 is fixedly connected to the first mounting seat 301. A zero pin 306 is installed between the detection shaft 304 and the output end of the second cylinder 302. A contour detection block 303 is slidably installed on the other end of the detection shaft 304. A spring is provided between the contour detection block 303 and the detection shaft 304. The detection shaft 304 elastically supports the contour detection block 303 through the spring, so that the two contour detection blocks 303 can detect the positions of the left and right oxygen sensors of the exhaust pipe.

[0030] See also Figures 1 to 5A flange flatness detection station 2 is installed between the two main flange mounting block position detection mechanisms 104, a bellows flange positioning frame 4 is installed behind the left oxygen sensor detection station 3, and a bellows flatness detection mechanism 5 is installed on the left side of the bellows flange position detection mechanism 6. The flange flatness detection station 2 and the bellows flatness detection mechanism 5 both include an X-direction linear module, a Y-direction linear module is installed on the upper end of the X-direction pointing module, a Z-direction cylinder is fixedly installed on the upper end of the Y-direction linear module, and a flatness detection head is fixedly installed on the output end of the Z-direction cylinder. The flatness detection head is used to synchronously detect the flange flatness and the bellows flatness of the exhaust pipe.

[0031] See also Figure 3 、 Figure 7 and Figure 8 A bellows flange position detection mechanism 6 is installed on the left side of the left oxygen sensor detection station 3. The bellows flange position detection mechanism 6 includes a second mounting seat 601. A fourth cylinder 605 is fixedly installed on the upper end of the second mounting seat 601. A linear guide 604 is fixedly installed on the output end of the fourth cylinder 605. The linear guide 604 is slidably connected to the upper end of the second mounting seat 601. Two third cylinders 602 are fixedly installed on one end of the linear guide 604. A transmission frame is fixedly installed on the output end of the two third cylinders 602. A second detection pin 603 is slidably connected to the inner side of the upper end of the transmission frame. The second detection pin 603 is connected to the transmission frame through a spring. The two second detection pins 603 detect the position of the bellows flange through the transmission frame under the elastic support of the spring.

[0032] See also Figure 2 、 Figure 3 、 Figure 4 and Figure 9 The rear end of the main body positioning mechanism 1 is equipped with an auxiliary support mechanism 7, and the rear assembly surface detection mechanism 8 is installed behind the auxiliary support mechanism 7. The rear assembly surface detection mechanism 8 includes a third mounting seat 801, and the upper end of the third mounting seat 801 is fixedly equipped with a fifth cylinder 806. The output end of the fifth cylinder 806 is fixedly equipped with a linear pneumatic guide rail 805, and the rear end of the linear pneumatic guide rail 805 is fixedly equipped with a second displacement sensor 807. The upper end surface of the linear pneumatic guide rail 805 is fixedly equipped with a first connecting seat 804, and the second displacement sensor The device 807 is slidably connected to the first connecting seat 804, and the upper end surface of the first connecting seat 804 is fixedly installed with an assembly contour detection plate 803, and the inner side of the assembly contour detection plate 803 is slidably connected with a third detection pin 802. The rear end of the third detection pin 802 passes through the assembly contour detection plate 803 and is connected to the first connecting seat 804 through a spring, so that the third detection pin 802 can detect the position of the rear assembly surface of the exhaust pipe, and at the same time, the surface assembly contour of the exhaust pipe can be detected through the assembly contour detection plate 803.

[0033] See also Figure 1 、 Figure 3 and Figure 10 , a welding flange detection mechanism 9 is installed on the outer side of the rear assembly surface detection mechanism 8, and the welding flange detection mechanism 9 includes a fourth mounting seat 901, and a sixth cylinder 904 is fixedly installed on the upper end of the fourth mounting seat 901, and a seventh cylinder 905 is fixedly installed on the output end of the sixth cylinder 904, and a second connecting seat 906 is fixedly installed on the output end of the seventh cylinder 905. A third displacement sensor 907 is fixedly installed on the upper end surface of the second connecting seat 906, and a mounting hole detection rod 902 is installed in front of the third displacement sensor 907. Two welding flange contour detection rods 903 are installed on one side of the mounting hole detection rod 902, and the welding flange contour detection rod 903 is connected to the second connecting seat 906 through a spring sliding connection, and the mounting hole detection rod 902 is fixedly connected to the second connecting seat 906. The second connecting seat 906 drives the mounting hole detection rod 902 and the welding flange contour detection rod 903 to respectively detect the contours of the mounting hole and the welding flange of the exhaust pipe.

[0034] See also Figures 1 to 10 The support frame 101, the first mounting seat 301, the second mounting seat 601, the third mounting seat 801, the fourth mounting seat 901 and the bellows flange positioning frame 4 are all fixedly connected to the upper end of the mounting support box 11. A bellows flange is provided on the left side of the exhaust pipe. The upper end of the bellows flange positioning frame 4 is inserted into the inner side of the bellows flange. The bellows flange positioning frame 4 facilitates the positioning of the bellows flange of the exhaust pipe.

[0035] To sum up, when inspecting the exhaust pipe of an automobile, the exhaust pipe is manually placed on the upper end surface of the support frame 101 and positioned and calibrated through the calibration block 105. The cylinder provided at the bottom end of the positioning pin 102 drives the pressure claw 103 under the support of the support frame 101, and then the multiple pressure claws 103 fix the exhaust pipe and the support frame 101. At the same time, the bellows flange positioning frame 4 is used to facilitate positioning of the bellows flange of the exhaust pipe, and the auxiliary support mechanism 7 is used to facilitate auxiliary support of the rear end of the exhaust pipe. The first cylinder 107 drives the first detection pin 106 to penetrate the support frame 101 and contact with the bottom end of the exhaust pipe under the support of the cylinder mounting frame 108 to detect the position of the main flange mounting block of the exhaust pipe.

[0036] The X-axis linear module, Y-axis linear module and Z-axis cylinder in the flange flatness detection station 2 and the bellows flatness detection mechanism 5 drive the flatness detection head to a position, and then the flange flatness detection station 2 and the bellows flatness detection mechanism 5 are used to synchronously detect the flatness of the exhaust pipe flange and the bellows;

[0037] A left oxygen sensor detection station 3 and a right oxygen sensor detection station 10 are respectively installed on both sides of the exhaust pipe, so that the second cylinder 302, supported by the first mounting seat 301, drives the detection shaft 304 and the contour detection block 303 to slide linearly relative to the first displacement sensor 305. The first displacement sensor 305 can then monitor the displacement of the detection shaft 304. At the same time, the detection shaft 304 elastically supports the contour detection block 303 via a spring, facilitating the two contour detection blocks 303 to detect the positions of the left and right oxygen sensors in the exhaust pipe.

[0038] Start the fourth cylinder 605, so that the fourth cylinder 605 drives the two third cylinders 602 to move horizontally under the support of the second mounting seat 601, and the two third cylinders 602 synchronously drive the two second detection pins 603 to adjust vertically through the transmission frame, and then the two second detection pins 603 detect the position of the bellows flange through the transmission frame under the elastic support of the spring, and the fifth cylinder 806 drives the first connecting seat 804 to slide horizontally under the support of the third mounting seat 801, and then the first connecting seat 804 slides relative to the third mounting seat 801 through the linear pneumatic guide 805 and synchronously drives the two third detection pins 802 to contact the rear assembly surface of the exhaust pipe, and then the displacement of the third detection pin 802 is monitored by the second displacement sensor 807 to enable the third detection pin 802 to detect the position of the rear assembly surface of the exhaust pipe, and at the same time, the surface assembly contour of the exhaust pipe can be detected by the assembly contour detection plate 803;

[0039] The position of the second connecting seat 906 can be adjusted in two directions through the sixth cylinder 904 and the seventh cylinder 905, and then the second connecting seat 906 drives the mounting hole detection rod 902 and the welding flange contour detection rod 903 to respectively detect the mounting hole and the welding flange contour of the exhaust pipe. After the exhaust pipe is positioned, fixed and supported by the main body positioning mechanism 1, the bellows flange positioning frame 4 and the auxiliary support mechanism 7, the flange flatness detection station 2, the left oxygen sensor detection station 3, the bellows flatness detection mechanism 5, the bellows flange position detection mechanism 6, the rear assembly surface detection mechanism 8, the welding flange detection mechanism 9 and the right oxygen sensor detection station 10 are started synchronously to detect various parameters of the exhaust pipe, thereby realizing automatic and all-round detection operation of the exhaust pipe, with high detection efficiency and accuracy, saving time and effort.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An automated exhaust pipe size detection device, comprising a mounting support box (11), characterized in that: A main body positioning mechanism (1) is installed in the middle of the upper end surface of the mounting support box (11), a left oxygen sensor detection station (3) is installed on the left side of the main body positioning mechanism (1), a bellows flange position detection mechanism (6) is installed on the left side of the left oxygen sensor detection station (3), a bellows flange positioning frame (4) is installed behind the left oxygen sensor detection station (3), a bellows flatness detection mechanism (5) is installed on the left side of the bellows flange position detection mechanism (6), a right oxygen sensor detection station (10) is installed on the right side of the main body positioning mechanism (1), an auxiliary support mechanism (7) is installed at the rear end of the main body positioning mechanism (1), a rear assembly surface detection mechanism (8) is installed behind the auxiliary support mechanism (7), and a welding flange detection mechanism (9) is installed on the outside of the rear assembly surface detection mechanism (8); The upper end of the main body positioning mechanism (1) is provided with an exhaust pipe, and the main body positioning mechanism (1) includes a support frame (101), a calibration block (105) is fixedly installed in the middle of the upper end surface of the support frame (101), the upper end of the support frame (101) is rotatably connected to a pressure claw (103), the bottom end of the exhaust pipe is fixedly connected to the support frame (101) through a plurality of pressure claws (103), the upper end surface of the support frame (101) is provided with a plurality of positioning pins (102), and two main flange mounting block position detection mechanisms (104) are installed on the inner side of the support frame (101), and the two main flange mounting blocks are provided with a position detection mechanism (104). A flange flatness detection station (2) is installed between the mounting block position detection mechanism (104), the main flange mounting block position detection mechanism (104) includes a cylinder mounting frame (108), the support frame (101) is fixedly connected to the two cylinder mounting frames (108), a first cylinder (107) is fixedly installed at the bottom end of the cylinder mounting frame (108), a first detection pin (106) is fixedly installed at the output end of the first cylinder (107), and the upper end of the first detection pin (106) passes through the cylinder mounting frame (108) and the support frame (101) and is in contact with the bottom end of the exhaust pipe; The left oxygen sensor detection station (3) and the right oxygen sensor detection station (10) both include a first mounting seat (301), a first displacement sensor (305) fixedly mounted on the upper end of the first mounting seat (301), a detection shaft (304) slidably connected to one side of the first displacement sensor (305), the detection shaft (304) being slidably connected to the first mounting seat (301), a second cylinder (302) fixedly mounted on one end of the detection shaft (304), the second cylinder (302) being fixedly connected to the first mounting seat (301), a zeroing pin (306) being mounted between the detection shaft (304) and the output end of the second cylinder (302), a profile detection block (303) being slidably mounted on the other end of the detection shaft (304), and a spring being provided between the profile detection block (303) and the detection shaft (304); The bellows flange position detection mechanism (6) includes a second mounting seat (601), a fourth cylinder (605) is fixedly mounted on the upper end of the second mounting seat (601), a linear guide rail (604) is fixedly mounted on the output end of the fourth cylinder (605), the linear guide rail (604) is slidably connected to the upper end of the second mounting seat (601), two third cylinders (602) are fixedly mounted on one end of the linear guide rail (604), a transmission frame is fixedly mounted on the output ends of the two third cylinders (602), a second detection pin (603) is slidably connected to the inner side of the upper end of the transmission frame, and the second detection pin (603) is connected to the transmission frame via a spring; The rear assembly surface detection mechanism (8) comprises a third mounting seat (801), a fifth cylinder (806) is fixedly mounted on the upper end of the third mounting seat (801), a linear pneumatic guide rail (805) is fixedly mounted on the output end of the fifth cylinder (806), a second displacement sensor (807) is fixedly mounted on the rear end of the linear pneumatic guide rail (805), a first connecting seat (804) is fixedly mounted on the upper end surface of the linear pneumatic guide rail (805), the second displacement sensor (807) is slidably connected to the first connecting seat (804), an assembly contour detection plate (803) is fixedly mounted on the upper end surface of the first connecting seat (804), a third detection pin (802) is slidably connected to the inner side of the assembly contour detection plate (803), and the rear end of the third detection pin (802) passes through the assembly contour detection plate (803) and is connected to the first connecting seat (804) via a spring.

2. The automatic exhaust pipe size detection device according to claim 1, characterized in that: The welding flange detection mechanism (9) comprises a fourth mounting seat (901), a sixth cylinder (904) is fixedly mounted on the upper end of the fourth mounting seat (901), a seventh cylinder (905) is fixedly mounted on the output end of the sixth cylinder (904), a second connecting seat (906) is fixedly mounted on the output end of the seventh cylinder (905), a third displacement sensor (907) is fixedly mounted on the upper end surface of the second connecting seat (906), a mounting hole detection rod (902) is mounted in front of the third displacement sensor (907), two welding flange contour detection rods (903) are mounted on one side of the mounting hole detection rod (902), the welding flange contour detection rod (903) is slidably connected to the second connecting seat (906) via a spring, and the mounting hole detection rod (902) is fixedly connected to the second connecting seat (906).

3. The automatic exhaust pipe size detection device according to claim 2, characterized in that: The flange flatness detection station (2) and the bellows flatness detection mechanism (5) both include an X-direction linear module, a Y-direction linear module is mounted on the upper end of the X-direction linear module, a Z-direction cylinder is fixedly mounted on the upper end of the Y-direction linear module, and a flatness detection head is fixedly mounted on the output end of the Z-direction cylinder.

4. The automatic exhaust pipe size detection device according to claim 3, characterized in that: The support frame (101), the first mounting seat (301), the second mounting seat (601), the third mounting seat (801), the fourth mounting seat (901) and the bellows flange positioning frame (4) are all fixedly connected to the upper end of the mounting support box (11); a bellows flange is provided on the left side of the exhaust pipe, and the upper end of the bellows flange positioning frame (4) is plugged into the inner side of the bellows flange.

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