A fixture for machining an automotive exhaust manifold

Abstract

The present invention discloses a fixture for machining an automotive exhaust manifold, which relates to the technical field of automotive parts machining. The present invention includes a fixture mechanism and a manifold body. The manifold body includes an exhaust main pipe. One end of the exhaust main pipe is fixedly installed with a plurality of exhaust branch pipes. The other end of the exhaust main pipe is fixedly installed with a main pipe assembly disc. The other ends of the exhaust branch pipes are all fixedly installed with branch pipe assembly discs. A plurality of assembly holes are formed in the side walls of the main pipe assembly disc and the branch pipe assembly discs. By setting the fixture mechanism in the present invention, the manifold body is first placed on the top of the fixture mechanism, and the exhaust branch pipes are downwardly sleeved on a plurality of three-finger fixtures. The three-finger fixtures drive the pneumatic jaws to move away from each other and clamp it from the inside, so that the manifold body is fixedly clamped on the fixture table. The whole manifold body is fixed by respectively fixedly clamping the exhaust branch pipes. The operation is simple, the clamping is stable, and it is convenient to machine the exhaust main pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts processing, and particularly relates to a fixture for processing an automotive exhaust manifold. Background Technique

[0002] The exhaust manifold is a component closely connected to the engine cylinder block. Its core function is to collect the exhaust gases from each cylinder and direct them to the exhaust main pipe. The exhaust manifold usually has branched pipes to ensure the smooth discharge of exhaust gases. The exhaust manifold includes an exhaust main pipe and a plurality of exhaust branch pipes connected to the exhaust main pipe. The end faces of the plurality of exhaust branch pipes are connected together to form the large surface of the exhaust manifold. When designing the exhaust manifold, the key is to reduce the exhaust resistance and prevent mutual interference between cylinders.

[0003] When processing the exhaust manifold, it is necessary to mill and polish the inner and outer circles of the exhaust main pipe. During the processing, a fixture is required to stably clamp the exhaust manifold. Currently, when using the fixture for processing the exhaust main pipe, in order to match the complex shape of the exhaust manifold, the fixture needs to perform multi-point clamping, which is not only troublesome to operate, but also has low clamping stability, and it is easy to cause the exhaust manifold to shake and shift during processing. For this reason, a fixture for processing an automotive exhaust manifold is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that when using the current fixture for processing the exhaust main pipe, in order to match the complex shape of the exhaust manifold, the fixture needs to perform multi-point clamping, which is not only troublesome to operate, but also has low clamping stability, and it is easy to cause the exhaust manifold to shake and shift during processing. The present invention provides a fixture for processing an automotive exhaust manifold.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0006] A fixture for processing an automotive exhaust manifold, including a fixture mechanism and a manifold body. The manifold body includes an exhaust main pipe. One end of the exhaust main pipe is fixedly installed with a plurality of exhaust branch pipes. The other end of the exhaust main pipe is fixedly installed with a main pipe assembly disc. The other ends of the exhaust branch pipes are all fixedly installed with branch pipe assembly discs. A plurality of assembly holes are provided on the side walls of the main pipe assembly disc and the branch pipe assembly discs.

[0007] The fixture mechanism includes a fixture table. A main slide rail is fixedly installed on the top of the fixture table. A plurality of main slide blocks are slidably installed on the top of the main slide rail. Fixture main brackets are fixedly installed on the tops of the main slide blocks. Assembly round tables are fixedly installed at the tops of the fixture main brackets. Three-finger fixtures are fixedly installed on the tops of the assembly round tables. Three pneumatic jaws are evenly distributed and drivenly installed on the tops of the three-finger fixtures. A distance adjustment component is provided between any two of the fixture main brackets.

[0008] The distance adjustment component is used to adjust the overall position of the three-finger fixture. The distance adjustment component includes two adjustment screw cylinders respectively and fixedly installed on the adjacent sides of any two adjacent fixture main brackets close to each other. The same double-headed screw is screwed inside the two adjustment screw cylinders. An adjustment ring is fixedly sleeved on the double-headed screw. A linear guide rail parallel to the two main slide rails is fixedly installed on the top of the fixture table. Electric sliders are drivingly installed on the top of the linear guide rail. Positioning rods are fixedly installed on the top of the electric sliders. Multiple fixture main brackets are all located between the two positioning rods.

[0009] Furthermore, assembly rings are fixedly sleeved on the assembly turntables. Lower positioning discs are fixedly installed on the tops of the assembly rings. Multiple positioning insertion rods adapted to the assembly holes are fixedly installed on the tops of the lower positioning discs.

[0010] Furthermore, multiple uniformly distributed hydraulic lifting rods are fixedly installed on the top of the fixture table. The hydraulic lifting rods are all vertically arranged. The telescopic ends of the hydraulic lifting rods all face upward and are fixedly installed with the same auxiliary slide rail. Multiple uniformly distributed auxiliary slide tables are slidably installed on the top of the auxiliary slide rail. Fixture auxiliary brackets are fixedly installed on the tops of the auxiliary slide tables. Upper positioning discs are fixedly installed on the tops of the fixture auxiliary brackets. Positioning caps adapted to the positioning insertion rods are fixedly installed on the bottoms of the upper positioning discs. Linkage frames are fixedly installed on one side of each auxiliary slide table. The bottoms of multiple linkage frames are respectively slidably installed on multiple fixture main brackets.

[0011] Furthermore, lower screw holes are formed in the side walls of the assembly rings. Lower fastening bolt groups are inserted through the lower screw holes. The assembly rings are fixedly connected to the assembly turntables through the lower fastening bolt groups. Upper screw holes are formed in the upper positioning discs. The upper positioning discs are fixedly connected to the fixture auxiliary brackets through upper fastening bolt groups.

[0012] Furthermore, a distance measuring baffle is fixedly installed on one side of one of the fixture auxiliary brackets. Laser distance meters are fixedly installed on one side of the other fixture auxiliary brackets. The positions of multiple laser distance meters correspond to the position of the distance measuring baffle.

[0013] Furthermore, protective sleeves are fixedly installed on both sides of the adjustment ring. The two protective sleeves are respectively movably sleeved on the two adjustment screw cylinders. Lubrication holes are formed in the side walls of the protective sleeves. Sealing plug caps are inserted into the lubrication holes.

[0014] Furthermore, assembly screws are fixedly installed at the mutually remote ends of the three pneumatic jaws. Assembly top blocks are screwed on the assembly screws.

[0015] Furthermore, rubber caps are sleeved on the assembly top blocks.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. By setting the fixture mechanism in the present invention, the manifold body is first placed on the top of the fixture mechanism, and the exhaust branch pipes are downwardly sleeved on multiple three-finger fixtures. The three-finger fixtures drive the pneumatic jaws to move away from each other and clamp it from the inside, so that the manifold body is fixedly clamped on the fixture table. By fixing and clamping the exhaust branch pipes respectively, the whole manifold body is fixed, with simple operation and stable clamping, which is convenient for processing the exhaust main pipe;

[0018] 2. By setting the distance adjustment component in the present invention, when it is necessary to clamp manifold bodies of different models, each adjusting ring can be rotated to make the positions of multiple three-finger fixtures correspond to the positions of the new exhaust branch pipes respectively. Finally, two electric sliders are controlled to drive the positioning rod to clamp on one side of the two outermost fixture main brackets, fixing the overall position of the three-finger fixtures, realizing the position adjustment of the fixture mechanism, and making the fixture for processing the automotive exhaust manifold have a certain versatility;

[0019] 3. By setting the positioning insertion rods in the present invention, when the manifold body is placed on the fixture mechanism, one ends of multiple exhaust branch pipes will be located on the tops of multiple lower positioning disks. At the same time, multiple positioning insertion rods on the lower positioning disks will be automatically inserted into the respective assembly holes respectively as the exhaust branch pipes are docked with the three-finger fixtures, thus playing a role in preliminary positioning of the manifold body and making the manifold body stand on each lower positioning disk, which is convenient for the three-finger fixtures to drive the pneumatic jaws to clamp the exhaust branch pipes internally;

[0020] 4. By setting the upper positioning disk in the present invention, after the three-finger fixtures drive the pneumatic jaws to clamp each exhaust branch pipe internally, multiple hydraulic lifting rods will simultaneously drive the lower positioning disk and the upper positioning disk to clamp the respective branch pipe assembly disks up and down, realizing the external clamping of the manifold body, making the clamping of the manifold body more stable, and enabling the processing equipment to apply a large load to the exhaust main pipe without affecting the clamping state of the fixture mechanism on the manifold body;

[0021] 5. By setting the lower fastening bolt group and the upper fastening bolt group in the present invention, the assembly ring and the upper positioning disk are respectively fixedly connected to the assembly round table and the laser rangefinder through the lower fastening bolt group and the upper fastening bolt group, which is convenient for the disassembly and reassembly of the assembly ring and the upper positioning disk, and enables the assembly ring, the lower positioning disk, the positioning insertion rods, as well as the upper positioning disk and the positioning cap to be quickly replaced according to the specifications and shapes of the manifold body, further improving the applicable range of the fixture for processing the automotive exhaust manifold;

[0022] 6. By providing a laser rangefinder in the present invention, when adjusting the spacing and position of each three-finger fixture through the distance adjustment assembly, multiple fixture sub-brackets on one side will always move synchronously with the fixture main bracket through the linkage frame at the bottom, that is, the spacing of the fixture sub-brackets is consistent with the spacing of the fixture main bracket. The laser rangefinder will emit laser light towards the laser rangefinder or the ranging baffle on one side and accurately display the spacing between the two fixture sub-brackets, thus facilitating the precise control of the spacing of the three-finger fixture.

[0023] 7. By providing a protective sleeve in the present invention, the protective sleeve can cover the double-headed screw, playing a role in dust prevention and moisture protection, preventing the meshing transmission of the adjusting screw barrel and the double-headed screw from becoming sluggish due to problems such as rust and dust. At the same time, the sealing plug cap can be opened regularly, and lubricating oil can be dripped into the interior of the protective sleeve through the lubricating hole to lubricate and maintain the double-headed screw and the adjusting screw barrel, extending their service lives.

[0024] 8. By providing an assembly top block in the present invention, different assembly top blocks can be installed on the assembly screw, expanding the clamping range of the three-finger fixture, enabling the fixture for machining the automotive exhaust manifold to stably clamp exhaust branch pipes with different inner diameters. Rubber caps are sleeved on the assembly top blocks, which can prevent the rigid contact between the assembly top blocks and the exhaust branch pipes, preventing dents and hidden damages from appearing on the inner wall of the exhaust branch pipes due to excessive clamping force. At the same time, the elastic deformation of the rubber caps increases the friction force between the rubber caps and the inner wall of the exhaust branch pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic three-dimensional structure diagram of the fixture mechanism of the present invention cooperating with the manifold body;

[0026] Figure 2 is a schematic three-dimensional structure diagram of the manifold body of the present invention;

[0027] Figure 3 is a schematic three-dimensional structure diagram of the fixture mechanism of the present invention;

[0028] Figure 4 is of the present invention Figure 3 structural schematic diagram at A in;

[0029] Figure 5 is a schematic three-dimensional structure diagram of the fixture main bracket cooperating with the assembly round table of the present invention;

[0030] Figure 6 is a schematic three-dimensional structure diagram of the assembly round table cooperating with the assembly ring of the present invention;

[0031] Figure 7 is of the present invention Figure 6 structural schematic diagram at B in;

[0032] Figure 8It is a schematic diagram of the three-dimensional structure inside the protective sleeve of the present invention;

[0033] Figure 9 It is a schematic diagram of the three-dimensional structure of the cooperation between the secondary slide rail and the upper positioning plate of the present invention;

[0034] Figure 10 It is a schematic diagram of the three-dimensional structure of the cooperation between the secondary fixture bracket and the upper positioning plate of the present invention;

[0035] Reference numerals: 1, manifold body; 101, exhaust main pipe; 102, exhaust branch pipe; 103, main pipe assembly plate; 104, branch pipe assembly plate; 105, assembly hole; 2, fixture table; 3, main slide rail; 4, main slide table; 5, main fixture bracket; 6, assembly round table; 7, three-finger fixture; 8, pneumatic gripper; 9, adjusting screw barrel; 10, double-headed screw; 11, adjusting ring; 12, linear guide rail; 13, electric slider; 14, positioning rod; 15, assembly ring; 16, lower positioning plate; 17, positioning plug; 18, hydraulic lifting rod; 19, secondary slide rail; 20, secondary slide table; 21, secondary fixture bracket; 22, upper positioning plate; 23, positioning cap; 24, linkage frame; 25, lower fastening bolt group; 26, upper fastening bolt group; 27, laser rangefinder; 28, ranging baffle; 29, protective sleeve; 30, sealing plug cap; 31, assembly screw; 32, assembly top block; 33, rubber cap. Detailed implementation manners

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inside", "outside", "upper", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] As Figures 1 to 10 shown, a fixture for machining an automotive exhaust manifold includes a fixture mechanism and a manifold body 1. As Figure 2 shown, the manifold body 1 includes an exhaust main pipe 101. One end of the exhaust main pipe 101 is fixedly installed with a plurality of exhaust branch pipes 102. The other end of the exhaust main pipe 101 is fixedly installed with a main pipe assembly disc 103. The other ends of the exhaust branch pipes 102 are all fixedly installed with branch pipe assembly discs 104. A plurality of assembly holes 105 are formed on the side walls of the main pipe assembly disc 103 and the branch pipe assembly discs 104.

[0041] As Figure 3 shown, the fixture mechanism includes a fixture table 2. A main slide rail 3 is fixedly installed on the top of the fixture table 2. As Figure 4 shown, a plurality of main slide blocks 4 are slidably installed on the top of the main slide rail 3. Fixture main brackets 5 are fixedly installed on the tops of the main slide blocks 4. As Figure 5 shown, assembly round platforms 6 are fixedly installed at the tops of the fixture main brackets 5. Three-finger fixtures 7 are fixedly installed on the tops of the assembly round platforms 6. As Figure 6 shown, three pneumatic jaws 8 evenly distributed are driven and installed on the tops of the three-finger fixtures 7. A distance adjustment component is arranged between any two fixture main brackets 5. Specifically, when the fixture for machining the automotive exhaust manifold is in use, by setting the fixture mechanism, the manifold body 1 to be machined is first taken to the top of the fixture mechanism, the exhaust branch pipes 102 on the manifold body 1 are downward and aligned with the positions where the plurality of three-finger fixtures 7 are located, and the plurality of exhaust branch pipes 102 are respectively sleeved on the plurality of three-finger fixtures 7. At this time, control each three-finger fixture 7 to drive the three pneumatic jaws 8 to move away from each other, and clamp the exhaust branch pipes 102 from the inside, so that the manifold body 1 is fixedly clamped on the fixture table 2. The whole manifold body 1 is fixed by respectively fixedly clamping the exhaust branch pipes 102. The operation is simple, the clamping is stable, and it is convenient to machine the exhaust main pipe 101.

[0042] The distance adjustment component is used to adjust the overall position of the three-finger fixture 7. As Figure 5 shown, the distance adjustment component includes two adjustment screw cylinders 9 respectively fixedly installed on the closer sides of any two adjacent fixture main brackets 5. As Figure 8As shown, a same double-headed screw rod 10 is screwed inside two adjusting screw barrels 9, and an adjusting rotating ring 11 is fixedly sleeved on the double-headed screw rod 10. As Figure 3 shown, a linear guide rail 12 parallel to the two main slide rails 3 is fixedly installed on the top of the fixture table 2. As Figure 4 shown, electric sliders 13 are drivingly installed on the tops of the linear guide rails 12, positioning rods 14 are fixedly installed on the tops of the electric sliders 13, and a plurality of fixture main brackets 5 are all located between the two positioning rods 14. In this embodiment, a mechanical locking mechanism or an electromagnetic locking device can be arranged on the linear guide rail 12 to limit the electric slider 13, so as to lock the fixture main bracket 5. Specifically, by arranging a distance adjusting assembly, when it is necessary to clamp manifolds 1 of different models, first rotate each adjusting rotating ring 11 according to the positions of the ports of each exhaust branch pipe 102 on the manifold 1, so as to drive the two ends of the double-headed screw rod 10 to perform spiral movement inside the two adjusting screw barrels 9 respectively, and then adjust the distances between the fixture main brackets 5, so that the positions of the plurality of three-finger fixtures 7 respectively correspond to the positions of the new exhaust branch pipes 102. Finally, control the two electric sliders 13 to slide on the linear guide rail 12 towards the positions of the fixture main brackets 5 respectively, drive the two positioning rods 14 to clamp on one side of the two outermost fixture main brackets 5, and use the locking device to lock the electric slider 13 to fix the overall position of the three-finger fixture 7, realizing the position adjustment of the fixture mechanism, so that the fixture for processing the automobile exhaust manifold has a certain versatility.

[0043] As Figure 6 shown, assembly rings 15 are fixedly sleeved on the assembly round tables 6, lower positioning discs 16 are fixedly installed on the tops of the assembly rings 15, and a plurality of positioning insertion rods 17 adapted to the assembly holes 105 are fixedly installed on the tops of the lower positioning discs 16. In this embodiment, the number and positions of the plurality of positioning insertion rods 17 correspond to the positions of the assembly holes 105, and the outer diameter dimension of the positioning insertion rod 17 is adapted to the inner diameter dimension of the assembly hole 105. Specifically, by arranging the positioning insertion rods 17, when the manifold 1 is placed on the fixture mechanism, one ends of the plurality of exhaust branch pipes 102 will be located on the tops of the plurality of lower positioning discs 16, and at the same time, the plurality of positioning insertion rods 17 on the lower positioning discs 16 will be automatically inserted into the respective assembly holes 105 respectively as the exhaust branch pipes 102 are docked with the three-finger fixtures 7, so as to play a role in primary positioning of the manifold 1, making the manifold 1 stand on the respective lower positioning discs 16, and facilitating the three-finger fixture 7 to drive the pneumatic clamping jaws 8 to perform internal clamping on the exhaust branch pipes 102.

[0044] As Figure 3 shown, a plurality of uniformly distributed hydraulic lifting rods 18 are fixedly installed on the top of the fixture table 2. The hydraulic lifting rods 18 are all vertically arranged, and the telescopic ends of the hydraulic lifting rods 18 all face upwards and are fixedly installed with a same secondary slide rail 19. As Figure 9As shown, a plurality of evenly distributed auxiliary sliding platforms 20 are slidably mounted on the top of the auxiliary sliding rail 19. Clamping auxiliary brackets 21 are fixedly mounted on the tops of the auxiliary sliding platforms 20. Upper positioning discs 22 are fixedly mounted on the tops of the clamping auxiliary brackets 21. As Figure 10 shown, positioning caps 23 adapted to the positioning insertion rods 17 are fixedly mounted on the bottoms of the upper positioning discs 22. Linkage frames 24 are fixedly mounted on one sides of the auxiliary sliding platforms 20. The bottoms of the plurality of linkage frames 24 are respectively slidably mounted on a plurality of clamping main brackets 5. Specifically, by providing the upper positioning discs 22, after the three-finger clamp 7 drives the pneumatic gripper 8 to perform internal clamping on each exhaust branch pipe 102, the manifold body 1 is in a state of precise positioning at this time. A plurality of clamping auxiliary brackets 21 on one side will be in the same position as a plurality of three-finger clamps 7 respectively under the linkage action of the linkage frames 24. Then, a plurality of hydraulic lifting rods 18 will simultaneously drive the auxiliary sliding rail 19 to descend, so as to drive the upper positioning discs 22 to descend to one side of the exhaust branch pipe 102 through the respective clamping auxiliary brackets 21, and make the positioning caps 23 at each place respectively dock with one of the positioning insertion rods 17, so that the lower positioning disc 16 and the upper positioning disc 22 perform upper and lower clamping on each branch pipe assembly disc 104, realizing external clamping of the manifold body 1, making the clamping of the manifold body 1 more stable, and enabling the processing equipment to apply a large load to the exhaust main pipe 101 without affecting the clamping state of the manifold body 1 by the clamping mechanism.

[0045] As Figure 6 shown, lower screw holes are formed in the side wall of the assembly ring 15. Lower fastening bolt groups 25 are passed through the interiors of the lower screw holes. The assembly ring 15 is fixedly connected to the assembly round platform 6 through the lower fastening bolt groups 25. As Figure 10 shown, upper screw holes are formed in the upper positioning discs 22. The upper positioning discs 22 are fixedly connected to the clamping auxiliary brackets 21 through upper fastening bolt groups 26. Specifically, by providing the lower fastening bolt groups 25 and the upper fastening bolt groups 26, the assembly ring 15 and the upper positioning discs 22 are respectively fixedly connected to the assembly round platform 6 and the laser rangefinder 27 through the lower fastening bolt groups 25 and the upper fastening bolt groups 26, facilitating the disassembly and reassembly of the assembly ring 15 and the upper positioning discs 22, and enabling the assembly ring 15, the lower positioning disc 16, the positioning insertion rods 17, and the upper positioning discs 22 and the positioning caps 23 to be quickly replaced according to the specifications and shapes of the manifold body 1, further improving the applicable range of the fixture for machining the automotive exhaust manifold.

[0046] As Figure 9As shown in the figure, a ranging baffle 28 is fixedly installed on one side of one of the fixture sub-brackets 21, and laser rangefinders 27 are fixedly installed on one side of the other fixture sub-brackets 21. The positions of the multiple laser rangefinders 27 correspond to the position of the ranging baffle 28. Specifically, by setting the laser rangefinders 27, when adjusting the spacing and position of each three-finger fixture 7 through the distance adjustment component, the multiple fixture sub-brackets 21 on one side will always move synchronously with the fixture main bracket 5 through the linkage frame 24 at the bottom, that is, the spacing of the fixture sub-brackets 21 is consistent with the spacing of the fixture main bracket 5. The laser rangefinders 27 will emit laser light to the laser rangefinders 27 or the ranging baffle 28 on one side and accurately display the spacing between the two fixture sub-brackets 21, so as to facilitate the accurate control of the spacing of the three-finger fixture 7.

[0047] As Figure 8 shown, protective sleeves 29 are fixedly installed on both sides of the adjusting ring 11. The two protective sleeves 29 are respectively movably sleeved on the two adjusting screw cylinders 9. Lubricating holes are provided on the side walls of the protective sleeves 29, and sealing plug caps 30 are inserted on the lubricating holes. Specifically, by setting the protective sleeves 29, the protective sleeves 29 can cover the double-headed screw 10, playing a role in dust prevention and moisture protection, preventing the meshing transmission of the adjusting screw cylinder 9 and the double-headed screw 10 from being stuck due to problems such as rust and dust. At the same time, the sealing plug caps 30 can be opened regularly, and lubricating oil can be dripped into the interior of the protective sleeves 29 through the lubricating holes to lubricate and maintain the double-headed screw 10 and the adjusting screw cylinder 9, extending the service life of the two.

[0048] As Figure 7 shown, assembly screws 31 are fixedly installed at the mutually remote ends of the three pneumatic jaws 8, and assembly top blocks 32 are screwed on the assembly screws 31. Specifically, by setting the assembly top blocks 32, according to the inner diameter size of the exhaust branch pipe 102, different assembly top blocks 32 are installed on the assembly screws 31 to expand the clamping range of the three-finger fixture 7, so that the fixture for machining the automotive exhaust manifold can stably clamp the exhaust branch pipes 102 with different inner diameter sizes. [[ID=,11]]

[0049] As Figure 7 shown, rubber caps 33 are sleeved on the assembly top blocks 32. Specifically, by setting the rubber caps 33, rubber caps 33 are sleeved on the assembly top blocks 32. The rubber caps 33 can prevent the assembly top blocks 32 from making rigid contact with the exhaust branch pipe 102, preventing dents and hidden damages from appearing on the inner wall of the exhaust branch pipe 102 due to excessive clamping force. At the same time, by means of the elastic deformation of the rubber caps 33, the friction force between the rubber caps 33 and the inner wall of the exhaust branch pipe 102 is increased.

[0050] In summary: When the fixture for machining the automotive exhaust manifold is in use, by setting up the fixture mechanism, the manifold body 1 to be machined is first placed on the top of the fixture mechanism, with the exhaust branch pipes 102 on the manifold body 1 facing downwards and aligned with the positions where multiple three-finger fixtures 7 are located. The multiple exhaust branch pipes 102 are respectively sleeved on the multiple three-finger fixtures 7. At this time, control each three-finger fixture 7 to drive the three pneumatic jaws 8 to move away from each other, and clamp the exhaust branch pipes 102 from the inside, so that the manifold body 1 is fixedly clamped on the fixture table 2. By fixedly clamping the exhaust branch pipes 102 respectively, the whole manifold body 1 is fixed. The operation is simple and the clamping is stable, which is convenient for machining the exhaust main pipe 101. By setting up the distance adjustment component, when it is necessary to clamp different models of manifold bodies 1, first rotate each adjusting ring 11 according to the positions of the ports of the exhaust branch pipes 102 on the manifold body 1, so as to drive the two ends of the double-headed screw rod 10 to perform spiral movement inside the two adjusting screw barrels 9 respectively, and then adjust the distances between the fixture main brackets 5, so that the positions of the multiple three-finger fixtures 7 respectively correspond to the positions of the new exhaust branch pipes 102. Finally, control the two electric sliders 13 to slide towards the positions of the fixture main brackets 5 on the linear guide rails 12 respectively, drive the two positioning rods 14 to clamp on one side of the two outermost fixture main brackets 5, and use the locking device to lock the electric sliders 13 to fix the overall position of the three-finger fixtures 7, realizing the position adjustment of the fixture mechanism, making the fixture for machining the automotive exhaust manifold have a certain versatility. By setting up the positioning insertion rods 17, when the manifold body 1 is placed on the fixture mechanism, one end of the multiple exhaust branch pipes 102 will be located on the tops of the multiple lower positioning discs 16. At the same time, the multiple positioning insertion rods 17 on the lower positioning discs 16 will be automatically inserted into the respective assembly holes 105 respectively as the exhaust branch pipes 102 are docked with the three-finger fixtures 7, thus playing a role in the preliminary positioning of the manifold body 1, making the manifold body 1 stand on the respective lower positioning discs 16, which is convenient for the three-finger fixture 7 to drive the pneumatic jaw 8 to perform internal clamping on the exhaust branch pipe 102. By setting up the upper positioning disc 22, after the three-finger fixture 7 drives the pneumatic jaw 8 to perform internal clamping on each exhaust branch pipe 102, the manifold body 1 is in a state of precise positioning at this time. The multiple fixture sub-brackets 21 on one side will be in the same position as the multiple three-finger fixtures 7 respectively under the linkage action of the linkage frame 24. Then the multiple hydraulic lifting rods 18 will drive the sub-slide rails 19 to descend simultaneously, so as to drive the upper positioning disc 22 to descend to one side of the exhaust branch pipe 102 through the respective fixture sub-brackets 21, and make the positioning caps 23 at each place respectively dock with one of the positioning insertion rods 17, so that the lower positioning disc 16 and the upper positioning disc 22 perform upper and lower clamping on each branch pipe assembly disc 104, realizing the external clamping of the manifold body 1, making the clamping of the manifold body 1 more stable, so that the processing equipment can apply a large load to the exhaust main pipe 101 without affecting the clamping state of the fixture mechanism on the manifold body 1. By setting up the lower fastening bolt group 25 and the upper fastening bolt group 26,The assembly ring 15 and the upper positioning disc 22 are respectively fixedly connected to the assembly frustum 6 and the laser rangefinder 27 through the lower fastening bolt group 25 and the upper fastening bolt group 26, which facilitates the disassembly and reassembly of the assembly ring 15 and the upper positioning disc 22, enabling the assembly ring 15, the lower positioning disc 16, the positioning plug rod 17, the upper positioning disc 22, and the positioning cap 23 to be quickly replaced according to the specifications and shapes of the manifold body 1, further improving the applicable range of the fixture for machining the automotive exhaust manifold. By providing the laser rangefinder 27, when adjusting the spacing and position of each three-finger fixture 7 through the distance adjusting component, multiple fixture sub-brackets 21 on one side will always maintain synchronous movement with the fixture main bracket 5 through the linkage frame 24 at the bottom, that is, the spacing of the fixture sub-brackets 21 is consistent with the spacing of the fixture main bracket 5. The laser rangefinder 27 will emit laser light to the laser rangefinder 27 or the ranging baffle 28 on one side and accurately display the spacing between the two fixture sub-brackets 21, thus facilitating the accurate control of the spacing of the three-finger fixture 7. By providing the protective sleeve 29, the protective sleeve 29 can cover the double-headed screw rod 10, playing a role in dust prevention and moisture protection, preventing the meshing transmission of the adjusting screw cylinder 9 and the double-headed screw rod 10 from becoming sluggish due to problems such as rust and dust. At the same time, the sealing plug cap 30 can be opened regularly, and lubricating oil can be dripped into the interior of the protective sleeve 29 through the lubrication hole to lubricate and maintain the double-headed screw rod 10 and the adjusting screw cylinder 9, extending their service lives. By providing the assembly top block 32, different assembly top blocks 32 can be installed on the assembly screw rod 31 according to the inner diameter size of the exhaust branch pipe 102, expanding the clamping range of the three-finger fixture 7, enabling the fixture for machining the automotive exhaust manifold to stably clamp the exhaust branch pipes 102 with different inner diameter sizes. By providing the rubber cap 33, rubber caps 33 are sleeved on the assembly top blocks 32. The rubber caps 33 can prevent the rigid contact between the assembly top blocks 32 and the exhaust branch pipe 102, preventing indentations and hidden damages on the inner wall of the exhaust branch pipe 102 due to excessive clamping force. At the same time, the elastic deformation of the rubber caps 33 is used to increase the friction force between the rubber caps 33 and the inner wall of the exhaust branch pipe 102.,

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixture for machining an automotive exhaust manifold, characterized in that, It includes a fixture mechanism. The fixture mechanism includes a fixture table (2). A main slide rail (3) is fixedly installed at the top of the fixture table (2). A plurality of main slide blocks (4) are slidably installed at the top of the main slide rail (3). Fixture main brackets (5) are fixedly installed at the top of each main slide block (4). Assembly turntables (6) are fixedly installed at the tops of the fixture main brackets (5). Three-finger fixtures (7) are fixedly installed at the tops of the assembly turntables (6). Three pneumatic jaws (8) evenly distributed are drivingly installed at the tops of the three-finger fixtures (7). A distance adjustment component is provided between any two of the fixture main brackets (5). Assembly rings (15) are fixedly sleeved on the assembly turntables (6). Lower positioning discs (16) are fixedly installed at the tops of the assembly rings (15). A plurality of positioning insertion rods (17) are fixedly installed at the tops of the lower positioning discs (16). A plurality of evenly distributed hydraulic lifting rods (18) are fixedly installed at the top of the fixture table (2). The hydraulic lifting rods (18) are all vertically arranged. The telescopic ends of the hydraulic lifting rods (18) all face upward and are fixedly installed with the same auxiliary slide rail (19). A plurality of evenly distributed auxiliary slide blocks (20) are slidably installed at the top of the auxiliary slide rail (19). Fixture auxiliary brackets (21) are fixedly installed at the tops of the auxiliary slide blocks (20). Upper positioning discs (22) are fixedly installed at the tops of the fixture auxiliary brackets (21). Positioning caps (23) adapted to the positioning insertion rods (17) are fixedly installed at the bottoms of the upper positioning discs (22). Linkage frames (24) are fixedly installed on one side of each auxiliary slide block (20). The bottoms of the plurality of linkage frames (24) are respectively slidably installed on the plurality of fixture main brackets (5). A manifold body (1) is arranged above the fixture table (2).

2. The fixture for machining an automotive exhaust manifold according to claim 1, characterized in that, The distance adjustment component is used to adjust the overall position of the three-finger fixture (7). The distance adjustment component includes two adjustment screw cylinders (9) respectively fixedly installed on the mutually approaching sides of any two adjacent fixture main brackets (5). The same double-headed screw rod (10) is screwed inside the two adjustment screw cylinders (9). An adjustment rotating ring (11) is fixedly sleeved on the double-headed screw rod (10). A linear guide rail (12) parallel to the two main slide rails (3) is fixedly installed at the top of the fixture table (2). Electric sliders (13) are drivingly installed at the top of the linear guide rail (12). Positioning rods (14) are fixedly installed at the tops of the electric sliders (13). The plurality of fixture main brackets (5) are all located between the two positioning rods (14). The manifold body (1) includes an exhaust main pipe (101) disposed above the fixture table (2). One end of the exhaust main pipe (101) is fixedly installed with a plurality of exhaust branch pipes (102). The other end of the exhaust main pipe (101) is fixedly installed with a main pipe assembly disc (103). The other ends of the exhaust branch pipes (102) are all fixedly installed with branch pipe assembly discs (104). A plurality of assembly holes (105) are formed in the side walls of the main pipe assembly disc (103) and the branch pipe assembly discs (104).

3. The fixture for machining an automotive exhaust manifold according to claim 2, wherein, Both sides of the adjusting ring (11) are fixedly installed with protective sleeves (29). The two protective sleeves (29) are respectively movably sleeved on the two adjusting screw cylinders (9). Lubricating holes are formed in the side walls of the protective sleeves (29), and sealing plug caps (30) are inserted into the lubricating holes.

4. A fixture for machining an automotive exhaust manifold according to claim 1, wherein, Lower screw holes are formed in the side wall of the assembly ring (15). Lower fastening bolt groups (25) are inserted into the lower screw holes. The assembly ring (15) is fixedly connected to the assembly frustum (6) through the lower fastening bolt groups (25). Upper screw holes are formed in the upper positioning disc (22). Upper fastening bolt groups (26) are inserted into the upper screw holes. The upper positioning disc (22) is fixedly connected to the fixture sub-bracket (21) through the upper fastening bolt groups (26).

5. The fixture for machining an automotive exhaust manifold according to claim 1, wherein A ranging baffle (28) is fixedly installed on one side of one of the fixture sub-brackets (21). Laser rangefinders (27) are fixedly installed on one side of the other fixture sub-brackets (21). The positions of the plurality of laser rangefinders (27) correspond to the position of the ranging baffle (28).

6. The fixture for machining an automotive exhaust manifold according to claim 1, wherein, Assembly screws (31) are fixedly installed at the mutually remote ends of the three pneumatic grippers (8). Assembly top blocks (32) are screwed onto the assembly screws (31).

7. A fixture for machining an automotive exhaust manifold according to claim 6, characterized in that, Rubber caps (33) are sleeved on the assembly top blocks (32).

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