Special detection tool for engine exhaust manifold

Abstract

The utility model relates to a special detection tool for an engine exhaust manifold, and belongs to the technical field of engine exhaust manifold processing and detection. The tool mainly comprises a horizontal base plate, a middle support plate, a detection support, a detection rod, a vertical plate, an A-surface positioning detection pin, a B-surface positioning detection pin and a C-surface positioning detection pin. According to the utility model, the installation state of the engine exhaust manifold can be rapidly simulated, the installation planes and the installation holes of the engine exhaust manifold are utilized to simulate assembly, the positioning detection pins are utilized to rapidly position and detect whether the sizes and positions of the installation planes and the installation holes of the engine exhaust manifold are qualified, and the detection rod slides up and down to detect the installation state of the engine exhaust manifold. Whether the size, the depth and the position relation of the sampling detection hole of the engine exhaust manifold are qualified or not can be rapidly judged, online detection and finished product detection of the engine exhaust manifold in the production field machining process are achieved, and the product quality and the production efficiency are improved.

Description

Technical Field

[0001] The utility model relates to a special detection tool for an engine exhaust manifold, belonging to the technical field of engine exhaust manifold processing and detection. Background Art

[0002] The exhaust manifold is a branched pipe that is connected to the engine cylinder block and collects the exhaust from each cylinder into the exhaust manifold. Its typical structure is as follows Figure 1 and Figure 2 As shown, the exhaust hole mounting surfaces of each cylinder are all on a mounting plane (the bottom horizontal mounting surface 8A shown in the figure), and the mounting surface of the manifold air collecting hole (the rear connecting end surface 8C shown in the figure) is at a 75° angle relative to the above-mentioned bottom horizontal mounting surface 8A, and the center line of the bolt through hole on the rear connecting end surface 8C is perpendicular to the rear connecting end surface 8C, and the sampling detection hole is located on the top mounting surface 8D, which is perpendicular to the rear connecting end surface 8C. Since the exhaust manifold is hard-connected to the engine housing, the processing dimensions and position of each mounting surface and mounting hole are very strict, and the process detection is very critical, otherwise it is easy to cause misalignment and seal leakage during the engine assembly process, which will increase the exhaust resistance and thus reduce the output power of the engine. In order to ensure the interchangeability and sealing performance of the final assembly process, the key dimensions and position of the engine exhaust manifold need to be fully inspected. Currently, the equipment that can accurately and quickly detect the dimensions and position of special-shaped parts is the three-coordinate measuring machine. However, the three-coordinate measuring machine is a precision testing equipment with very high requirements on ambient temperature and cleanliness. It is only suitable for working in a dedicated testing space and is not suitable for testing on production lines with relatively poor environments. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a special detection tool for an engine exhaust manifold, which can realize online rapid detection of the engine exhaust manifold at a production site.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a special detection tool for the engine exhaust manifold, comprising a horizontal bottom plate, an intermediate support plate, a detection bracket, a detection rod, a vertical plate, an A-side positioning detection pin, a B-side positioning detection pin and a C-side positioning detection pin, the upper end surface of the horizontal bottom plate is provided with a first detection installation positioning hole corresponding to the bolt through hole on the bottom horizontal mounting surface of the exhaust manifold workpiece, the center line of the first detection installation positioning hole is perpendicular to the upper end surface of the bottom plate, and the A-side positioning detection pin is correspondingly installed in the first detection installation positioning hole; the vertical plate is vertically fixedly arranged in the right area of ​​the upper end surface of the bottom plate, the left vertical surface of the vertical plate is used to fit with the right connecting end surface of the exhaust manifold workpiece, the vertical plate is provided with a second detection installation positioning hole corresponding to the bolt through hole on the right connecting end surface of the exhaust manifold workpiece, the center line of the second detection installation positioning hole is perpendicular to the left vertical surface of the vertical plate, and the B-side positioning detection pin is correspondingly installed in the second detection installation positioning hole; the intermediate support The plate is composed of a transition connecting plate located at its lower end and an upper positioning plate located at its upper end. The intermediate supporting plate is fixedly arranged in the left area of ​​the upper end surface of the bottom plate. The front side surface of the upper positioning plate is used to fit with the rear connecting end surface of the exhaust manifold workpiece. The upper positioning plate is provided with a third detection installation positioning hole corresponding to the bolt through hole on the rear connecting end surface of the exhaust manifold workpiece. The center line of the third detection installation positioning hole is perpendicular to the front side surface of the upper positioning plate, and the C-face positioning detection pin is correspondingly installed in the third detection installation positioning hole; the lower end of the detection bracket is fixedly connected to the intermediate supporting plate or the bottom plate, and the upper end of the detection bracket is provided with a detection rod positioning connecting plate, and the detection rod positioning connecting plate is provided with a fourth detection installation positioning hole. The detection rod is correspondingly installed in the fourth detection installation positioning hole, and the detection rod can slide along the axial direction of the fourth detection installation positioning hole. The lower end of the detection rod is provided with a measuring head, which is used to detect the sampling detection hole on the top mounting surface of the exhaust manifold workpiece.

[0005] It is further preferred that the transition connecting plate at the lower end of the middle supporting plate is perpendicular to the upper end surface of the bottom plate.

[0006] It is further preferred that the lower end of the detection bracket is a bracket connecting plate, the bracket connecting plate and the detection rod positioning connecting plate form an L-shaped structure, and the bracket connecting plate is fixedly connected to the upper positioning plate on the upper end of the middle support plate.

[0007] It is further preferred that a rectangular sink groove is opened in the upper area of ​​the rear side surface of the upper positioning plate, one end of the rectangular sink groove intersects with the upper end surface of the upper positioning plate, the lower end of the bracket connecting plate is positioned and clamped in the rectangular sink groove, and the bracket connecting plate and the upper positioning plate are connected and fixed together by connecting bolts.

[0008] It is further preferred that: the upper portion of the detection rod is a guide rod matched with the fourth detection installation positioning hole, and the guide rod is coaxial with the measuring head.

[0009] It is further preferred that the detection head is a cylindrical step structure, the cylindrical section with a small diameter on the detection head is the detection section, the cylindrical section with a large diameter is the connecting section, and a guide angle is provided at the front end of the detection section.

[0010] It is further preferred that: the lower end of the guide rod is connected and fixed to the connecting section of the measuring head by a threaded connection structure; the middle part of the guide rod has an annular positioning boss, and the side of the annular positioning boss facing the detection head is set to a limiting step surface that fits with the upper surface of the detection rod positioning connecting plate.

[0011] During the specific implementation, first place the horizontal mounting surface of the bottom end of the exhaust manifold workpiece on the horizontal bottom plate of the present invention, and insert the A-side positioning detection pins into the bolt through holes on the corresponding connecting surfaces of the exhaust manifold workpiece outlet respectively. After the A-side positioning detection pin passes the detection, the exhaust manifold workpiece is initially locked and positioned on the horizontal bottom plate with the A-side positioning detection pin. At the same time, observe whether the right connecting end face of the exhaust manifold workpiece is flush with the left side face of the vertical plate. If flush, use the B-side positioning detection pin to detect whether the size and position of the bolt through holes corresponding to the right connecting end face of the exhaust manifold workpiece are qualified. If qualified, use the B-side positioning detection pin to lock and position. Then further check whether the rear connecting end face of the exhaust manifold workpiece is aligned with the front side face of the upper positioning plate of the middle support plate. If aligned, use the C-face positioning detection pin to check whether the size and position of the bolt through holes thereon are qualified, and use the C-face positioning detection pin to connect and position; if the above steps are all qualified, after each face is positioned with the corresponding positioning detection pin, slide the guide rod of the detection rod up and down to observe whether its measuring head can smoothly enter the sampling detection hole of the exhaust manifold workpiece. If the measuring head can smoothly move in the small gap of the sampling detection hole, and the longitudinal movement distance just coincides with the adjustment mark on the measuring head, it proves that the spatial position, depth and size of the sampling detection hole are qualified. After the above detection and positioning process, it can be comprehensively determined that the size and spatial position of each connecting and mounting surface, bolt through hole and sampling detection hole of the exhaust manifold workpiece meet the design and installation interchangeability requirements, and the product processing is qualified.

[0012] The beneficial effects of the utility model are as follows: by utilizing the combined special detection tool, the installation state of the engine exhaust manifold can be quickly simulated, by utilizing the simulated assembly of the installation planes and installation holes of the engine exhaust manifold, by utilizing the various positioning detection pins, the size and position of the installation planes and installation holes of the engine exhaust manifold can be quickly located and detected to see whether they are qualified, by utilizing the up and down sliding of the detection rod, the size, depth and position relationship of the sampling detection holes of the engine exhaust manifold can be quickly determined to see whether they are qualified, thereby realizing the online detection of the engine exhaust manifold during the processing process at the production site and the finished product detection, thereby improving the product quality and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic diagram of the three-dimensional structure of an exhaust manifold workpiece.

[0014] Figure 2 It is a schematic structural diagram of the exhaust manifold workpiece involved in the utility model at another viewing angle.

[0015] Figure 3 It is a front view of the utility model when it is applied and implemented.

[0016] Figure 4 yes Figure 3 ZZ section view.

[0017] Figure 5 It is a top view of the utility model.

[0018] Figure 6 yes Figure 5 Front view shown.

[0019] Figure 7 It is a three-dimensional structural schematic diagram of the middle support plate involved in the utility model.

[0020] Figure 8 It is a three-dimensional structural schematic diagram of the detection bracket involved in the utility model.

[0021] Fig. 9 It is a cross-sectional view of the detection rod involved in the utility model.

[0022] The parts in the figure are marked as: horizontal bottom plate 1, middle support plate 2, detection bracket 3, detection rod 4, vertical plate 5, B surface positioning detection pin 6, A surface positioning detection pin 7, exhaust manifold workpiece 8, C surface positioning detection pin 9, connecting bolt 10;

[0023] Transition connecting plate 21, upper positioning plate 22, rectangular sinking groove 23, third detection installation positioning hole 24, bracket connection threaded hole 25, rectangular sinking groove bottom wall 26, detection rod positioning connecting plate 31, fourth detection installation positioning hole 32, bracket connecting plate 33, bracket connection screw through hole 34, measuring head 41, guide rod 42, detection section 411, connecting section 412, measuring head threaded hole 413, guide angle 414, annular positioning boss 421, limiting step surface 422, threaded column 423;

[0024] Bottom horizontal mounting surface 8A, right side connecting end surface 8B, rear side connecting end surface 8C, top mounting surface 8D;

[0025] Cylinder body connection base surface one 8A1, cylinder body connection base surface two 8A2, cylinder body connection base surface three 8A3, cylinder body connection base surface four 8A4;

[0026] Channel opening 81, air outlet one 82, air outlet two 83, air outlet three 84, air outlet four 85, air outlet five 86;

[0027] Bolt through hole five 801, bolt through hole one 802, bolt through hole two 803, bolt through hole three 804, bolt through hole four 805, bolt through hole six 806, sampling and detection hole 807. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figure 1 and Figure 2 As shown, the exhaust manifold workpiece 8 involved in the utility model has a cylinder body connection base surface 1 8A1, a cylinder body connection base surface 2 8A2, a cylinder body connection base surface 3 8A3 and a cylinder body connection base surface 4 8A4 distributed on the bottom horizontal mounting surface 8A in sequence, and the above four cylinder body connection base surfaces are correspondingly provided with an outlet port 1 82, an outlet port 2 83, an outlet port 3 84 and an outlet port 4 85 in sequence; the above four cylinder body connection base surfaces are correspondingly provided with a bolt through hole 1 802, a bolt through hole 2 803, a bolt through hole 3 804 and a bolt through hole 4 805 in sequence; the exhaust manifold workpiece 8 is provided with a right side connection end surface 8B on the right side, and a channel is provided on the right side connection end surface 8B Port 81 and bolt through hole five 801; a rear connecting end face 8C is provided on the left rear side of the exhaust manifold workpiece 8, and the rear connecting end face 8C forms an angle of 75° with respect to the bottom horizontal mounting face 8A in front thereof (the angle is marked as a in the figure), and an air outlet five 86 and a bolt through hole six 806 are provided on the rear connecting end face 8C; the exhaust manifold workpiece 8 is provided with a top mounting face 8D perpendicular to the rear connecting end face 8C at the top end of the rear connecting end face 8C, and a sampling detection hole 807 is provided on the top mounting face 8D, the center line of the sampling detection hole 807 is perpendicular to the top mounting face 8D, and the lower end of the sampling detection hole 807 is connected to the air outlet five 86.

[0030] In order to realize the online detection of the geometric positions of the mounting holes and mounting surfaces during the production process of the exhaust manifold workpiece 8, as shown in FIG. Figures 3 to 9 As shown, the special detection tool for the engine exhaust manifold described in the utility model includes a horizontal bottom plate 1, an intermediate support plate 2, a detection bracket 3, a detection rod 4, a vertical plate 5, an A-side positioning detection pin 7, a B-side positioning detection pin 6 and a C-side positioning detection pin 9.

[0031] The horizontal bottom plate 1 is a flat plate structure and is arranged horizontally. There is no specific requirement for the shape of the horizontal bottom plate 1, and it can be usually designed as a rectangular plate.

[0032] The upper end surface of the horizontal bottom plate 1 is provided with a first detection installation positioning hole corresponding to the bolt through hole on the bottom horizontal mounting surface 8A of the exhaust manifold workpiece 8. The center line of the first detection installation positioning hole is perpendicular to the upper end surface of the bottom plate 1, and the A-surface positioning detection pin 7 is correspondingly installed in the first detection installation positioning hole. The A-surface positioning detection pin 7 and the first detection installation positioning hole correspond to the bolt through hole on the bottom horizontal mounting surface 8A. The A-surface positioning detection pin 7 is used to detect the bolt through holes (i.e., bolt through hole 1 802, bolt through hole 2 803, bolt through hole 3 804, and bolt through hole 4 805 shown in the figure) on the bottom horizontal mounting surface 8A of the exhaust manifold workpiece 8, and the quantity and size specifications match them.

[0033] The vertical plate 5 is fixedly arranged vertically on the right area of ​​the upper end face of the bottom plate 1. The left vertical surface of the vertical plate 5 is used to fit with the right connecting end face 8B of the exhaust manifold workpiece 8. The vertical plate 5 is provided with a second detection installation positioning hole corresponding to the bolt through hole on the right connecting end face 8B of the exhaust manifold workpiece 8. The center line of the second detection installation positioning hole is perpendicular to the left vertical surface of the vertical plate 5. The B-side positioning detection pin 6 is correspondingly installed in the second detection installation positioning hole. There are no special technical requirements for the vertical plate 5, as long as it ensures that the left vertical surface can fit with the right connecting end face 8B of the exhaust manifold workpiece 8. The vertical plate 5 can usually adopt a rectangular plate structure, and the B-side positioning detection pin 6 and the second detection installation positioning hole correspond to the bolt through hole on the right connecting end face 8B of the exhaust manifold workpiece 8. The B-side positioning detection pin 6 is used to detect the bolt through hole (i.e., the bolt through hole 5 801 shown in the figure) on the right connecting end face 8B of the exhaust manifold workpiece 8, and the quantity and size specifications match it.

[0034] The intermediate support plate 2 is composed of a transition connecting plate 21 located at its lower end and an upper positioning plate 22 located at its upper end. The intermediate support plate 2 is fixedly arranged in the left area of ​​the upper end surface of the bottom plate 1. The front side surface of the upper positioning plate 22 is used to fit with the rear connecting end surface 8C of the exhaust manifold workpiece 8. The upper positioning plate 22 is provided with a third detection installation positioning hole 24 corresponding to the bolt through hole on the rear connecting end surface 8C of the exhaust manifold workpiece 8. The center line of the third detection installation positioning hole 24 is perpendicular to the front side surface of the upper positioning plate 22. The C-surface positioning detection pin 9 is installed correspondingly. Installed in the third detection installation positioning hole 24; the lower end of the detection bracket 3 is fixedly connected to the middle support plate 2 or the bottom plate 1, the upper end of the detection bracket 3 has a detection rod positioning connecting plate 31, and the detection rod positioning connecting plate 31 is provided with a fourth detection installation positioning hole 32, the detection rod 4 is correspondingly installed in the fourth detection installation positioning hole 32, the detection rod 4 can slide along the axial direction of the fourth detection installation positioning hole 32, and the lower end of the detection rod 4 has a measuring head 41, which is used to detect the sampling detection hole 807 on the top mounting surface 8D of the exhaust manifold workpiece 8. Among them, the middle support plate 2 only needs to ensure that the front side surface of the upper positioning plate 22 can fit with the rear connecting end surface 8C of the exhaust manifold workpiece 8. In the preferred solution, the transition connecting plate 21 at the lower end of the middle support plate 2 is perpendicular to the upper end surface of the bottom plate 1; the upper positioning plate 22 is arranged at an angle relative to the horizontal bottom plate 1, and the inclination angle is adapted to the angle a between the rear connecting end surface 8C of the exhaust manifold workpiece 8 and the bottom horizontal mounting surface 8A as mentioned above, which is 75° in this embodiment. The C-surface positioning detection pin 9 and the third detection installation positioning hole 24 correspond to the bolt through hole on the rear connecting end surface 8C of the exhaust manifold workpiece 8. The C-surface positioning detection pin 9 is used to detect the bolt through hole (i.e., the bolt through hole 6 806 shown in the figure) on the rear connecting end surface 8C of the exhaust manifold workpiece 8, and the quantity and size specifications match it.

[0035] The detection bracket 3 is used to position and support the detection rod 4. The installation position and installation angle of the detection rod positioning connecting plate 31 are adapted to the top mounting surface 8D of the exhaust manifold workpiece 8 where the top surface of the sampling detection hole 807 is located. Usually, the top mounting surface 8D is perpendicular to the rear connecting end surface 8C of the exhaust manifold workpiece 8. In order to facilitate processing and assembly, the utility model preferably designs the detection bracket 3 into an L-shaped structure. Specifically, the lower end of the detection bracket 3 is a bracket connecting plate 33. The bracket connecting plate 33 and the detection rod positioning connecting plate 31 form an L-shaped structure. The bracket connecting plate 33 is fixedly connected to the upper positioning plate 22 at the upper end of the intermediate support plate 2. The preferred fixed connection method is as follows: a rectangular sinking groove 23 is provided in the upper area of ​​the rear side surface of the upper positioning plate 22, one end of the rectangular sinking groove 23 intersects with the upper end surface of the upper positioning plate 22, the lower end of the bracket connecting plate 33 is positioned and clamped in the rectangular sinking groove 23, and the bracket connecting plate 33 and the upper positioning plate 22 are connected and fixed together by the connecting bolt 10. More specifically, during the fixed assembly, the bottom wall of the rectangular sinking groove 23 (i.e., the bottom wall 26 of the rectangular sinking groove shown in the figure) is used as the positioning and installation reference plane of the bracket connecting plate 33, and the two sides of the bracket connecting plate 33 simultaneously form a tight fit with the two side walls of the rectangular sinking groove 23, and finally the bracket connecting plate 33 and the upper positioning plate 22 are connected and fixed together by the connecting bolt 10. Correspondingly, a bracket connecting threaded hole 25 compatible with the connecting bolt 10 is provided on the bottom wall 26 of the rectangular sinking groove, and a bracket connecting screw through hole 34 compatible with the connecting bolt 10 is provided on the bracket connecting plate 33.

[0036] In order to facilitate the connection and positioning of the detection rod 4, the preferred embodiment of the detection rod 4 is as follows: the upper part of the detection rod 4 is a guide rod 42 adapted to the fourth detection installation positioning hole 32, and the guide rod 42 is coaxial with the measuring head 41. The detection head 41 is a cylindrical step structure, the cylindrical section with a small diameter on the detection head 41 is the detection section 411, and the cylindrical section with a large diameter is the connecting section 412, and the front end of the detection section 411 is provided with a guide angle 414. The lower end of the guide rod 42 is connected and fixed to the connecting section 412 of the measuring head 41 through a threaded connection structure. The embodiment shown in the figure is that a measuring head threaded hole 413 is provided on the end face of the connecting section 412, and a threaded column 423 is provided at the lower end of the guide rod 42; the middle part of the guide rod 42 is provided with an annular positioning boss 421, and the side of the annular positioning boss 421 facing the detection head 41 is provided with a limiting step surface 422 that fits the upper surface of the detection rod positioning connecting plate 31. During implementation, the guide rod 42 is inserted into the fourth detection installation positioning hole 32 from the upper end surface of the detection rod positioning connecting plate 31, and the limiting step surface 422 of the guide rod 42 contacts the upper end surface of the detection rod positioning connecting plate 31. The measuring head 41 is rotated using the threaded connection structure to adjust the upper and lower distances of the measuring head 41 to match the depth dimension of the sampling detection hole 807 on the top mounting surface 8D of the exhaust manifold workpiece 8.

[0037] When the detection is specifically implemented in this embodiment, the following steps can be followed: first, the bottom horizontal mounting surface 8A of the exhaust manifold workpiece 8 is placed on the horizontal bottom plate 1 of the present invention, and the A-side positioning detection pins 7 are respectively inserted into the bolt through holes on the corresponding connecting surfaces of the exhaust manifold workpiece 8 at the air outlet (i.e., bolt through hole 1 802, bolt through hole 2 803, bolt through hole 3 804 and bolt through hole 4 805 shown in the figure). After the A-side positioning detection pins 7 have passed the detection, the exhaust manifold workpiece 8 is initially locked and positioned on the horizontal bottom plate 1 with the A-side positioning detection pins 7, and at the same time, it is observed whether the right connecting end surface 8B of the exhaust manifold workpiece 8 is flush with the left side surface of the vertical plate 5. If they are flush, the B-side positioning detection pins 6 are used to detect whether the size and position of the bolt through holes (i.e., bolt through hole 5 801 shown in the figure) corresponding to the right connecting end surface 8B of the exhaust manifold workpiece 8 are qualified. If qualified, the B-side positioning detection pins 6 are used to lock and position them. Then further detect whether the rear connecting end face 8C of the exhaust manifold workpiece 8 is aligned with the front side face of the upper positioning plate 22 of the middle support plate 2. If aligned, use the C-face positioning detection pin 9 to detect whether the size and position of the bolt through hole (i.e., the bolt through hole 6 806 shown in the figure) thereon are qualified, and use the C-face positioning detection pin 9 to connect and position; if the above steps are all qualified, after each surface is positioned with the corresponding positioning detection pin, slide the guide rod 42 of the detection rod 4 up and down to observe whether its measuring head 41 can smoothly enter the sampling detection hole 807 of the exhaust manifold workpiece 8. If the measuring head 41 can smoothly move in the small gap in the sampling detection hole 807, and the longitudinal movement distance just coincides with the adjustment mark on the measuring head 41, it proves that the spatial position, depth and size of the sampling detection hole 807 are qualified. After the above detection and positioning process, it can be comprehensively determined that the size and spatial position of each connecting and mounting surface, bolt through hole and sampling detection hole of the exhaust manifold workpiece 8 meet the design and installation interchangeability requirements, and the product processing is qualified.

Claims

1. Special inspection tool for engine exhaust manifold, characterized by: It comprises a horizontal bottom plate (1), an intermediate support plate (2), a detection bracket (3), a detection rod (4), a vertical plate (5), an A-surface positioning detection pin (7), a B-surface positioning detection pin (6) and a C-surface positioning detection pin (9), The upper end surface of the horizontal bottom plate (1) is provided with a first detection installation positioning hole corresponding to the bolt through hole on the bottom horizontal installation surface (8A) of the exhaust manifold workpiece (8), the center line of the first detection installation positioning hole is perpendicular to the upper end surface of the bottom plate (1), and the A surface positioning detection pin (7) is correspondingly installed in the first detection installation positioning hole; The vertical plate (5) is vertically fixedly arranged in the right area of ​​the upper end surface of the bottom plate (1); the left vertical surface of the vertical plate (5) is used to fit with the right connecting end surface (8B) of the exhaust manifold workpiece (8); a second detection installation positioning hole corresponding to the bolt through hole on the right connecting end surface (8B) of the exhaust manifold workpiece (8) is arranged on the vertical plate (5); the center line of the second detection installation positioning hole is perpendicular to the left vertical surface of the vertical plate (5); and the B surface positioning detection pin (6) is correspondingly installed in the second detection installation positioning hole; The intermediate support plate (2) is composed of a transition connecting plate (21) located at its lower end and an upper positioning plate (22) located at its upper end. The intermediate support plate (2) is fixedly arranged in the left area of ​​the upper end surface of the bottom plate (1). The front side surface of the upper positioning plate (22) is used to fit with the rear connecting end surface (8C) of the exhaust manifold workpiece (8). The upper positioning plate (22) is provided with a third detection installation positioning hole (24) corresponding to the bolt through hole on the rear connecting end surface (8C) of the exhaust manifold workpiece (8). The center line of the third detection installation positioning hole (24) is perpendicular to the front side surface of the upper positioning plate (22). The C-surface positioning detection pin (9) is correspondingly installed in the third detection installation positioning hole (24). The lower end of the detection bracket (3) is fixedly connected to the middle support plate (2) or the bottom plate (1), the upper end of the detection bracket (3) is provided with a detection rod positioning connecting plate (31), a fourth detection installation positioning hole (32) is provided on the detection rod positioning connecting plate (31), the detection rod (4) is correspondingly installed in the fourth detection installation positioning hole (32), the detection rod (4) can slide along the axial direction of the fourth detection installation positioning hole (32), and the lower end of the detection rod (4) is provided with a measuring head (41), which is used to detect the sampling detection hole (807) on the top mounting surface (8D) of the exhaust manifold workpiece (8).

2. The special inspection tool for the engine exhaust manifold as claimed in claim 1, characterized in that: The transition connecting plate (21) at the lower end of the middle supporting plate (2) is perpendicular to the upper end surface of the bottom plate (1).

3. The special inspection tool for the engine exhaust manifold as claimed in claim 1, characterized in that: The lower end of the detection bracket (3) is a bracket connecting plate (33), the bracket connecting plate (33) and the detection rod positioning connecting plate (31) form an L-shaped structure, and the bracket connecting plate (33) is fixedly connected to the upper positioning plate (22) at the upper end of the middle support plate (2).

4. The special inspection tool for the engine exhaust manifold as claimed in claim 3, characterized in that: A rectangular sinking groove (23) is provided in the upper area of ​​the rear side surface of the upper positioning plate (22), one end of the rectangular sinking groove (23) intersects with the upper end surface of the upper positioning plate (22), the lower end of the bracket connecting plate (33) is positioned and clamped in the rectangular sinking groove (23), and the bracket connecting plate (33) and the upper positioning plate (22) are connected and fixed together by connecting bolts (10).

5. The special inspection tool for engine exhaust manifold according to any one of claims 1 to 4, characterized in that: The upper part of the detection rod (4) is a guide rod (42) adapted to the fourth detection installation positioning hole (32), and the guide rod (42) is coaxial with the measuring head (41).

6. The special inspection tool for the engine exhaust manifold as claimed in claim 5, characterized in that: The measuring head (41) is a cylindrical step structure, a cylindrical section with a small diameter on the measuring head (41) is a detection section (411), a cylindrical section with a large diameter is a connecting section (412), and a guide angle (414) is provided at the front end of the detection section (411).

7. The special inspection tool for the engine exhaust manifold as claimed in claim 6, characterized in that: The lower end of the guide rod (42) is fixedly connected to the connecting section (412) of the measuring head (41) via a threaded connection structure; the middle portion of the guide rod (42) is provided with an annular positioning boss (421), and the side of the annular positioning boss (421) facing the measuring head (41) is provided with a limiting step surface (422) that fits with the upper surface of the detection rod positioning connecting plate (31).

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