Automobile exhaust manifold pressure maintaining detection device

Abstract

The utility model discloses an automobile exhaust manifold pressure maintaining detection device which comprises a rack (1), a workbench (2) is arranged on the top of the rack (1), and the automobile exhaust manifold pressure maintaining detection device is characterized in that a first guide rail (3) and a second guide rail (4) which are parallel to each other are arranged on the two sides of the workbench (2), and an air cylinder sliding seat (5) is connected to the first guide rail (3) in a sliding mode; a cylinder (7) is supported at the top of the cylinder sliding seat (5) through a cylinder supporting frame (6), a pressing block (8) is hinged to the working end of the cylinder (7), the bottom end face of the pressing block (8) is matched with an air inlet flange face of a tested workpiece (9), meanwhile, a pressurizing air channel (10) is further formed in the pressing block (8), a pipe joint (11) is arranged at an inlet of the pressurizing air channel (10), and an outlet of the pressurizing air channel (10) is located in the bottom end face of the pressing block (8).

Description

Technical Field

[0001] The utility model relates to post-processing detection of automobile parts, in particular to a pressure-maintaining detection device for automobile exhaust manifolds. Background Art

[0002] In the manufacturing process of two-stage automobile exhaust manifolds, laser welding technology is required to weld the bellows between the front and rear manifolds, and then the welded assembly needs to be tested for air tightness. The air tightness test here is carried out in the form of inflation and pressure maintenance, that is, the compressed air of the specified pressure is filled into the sealed test cavity of each port, and then the inflation valve is closed. After the specified time is maintained, check whether the pressure drop meets the maximum limit of the technical requirements.

[0003] Therefore, the blocking effect of each port of the detection cavity will directly affect the effectiveness of the detection results. In actual implementation, the flange feature of each port is often used to sandwich a rubber sheet between the port flange and the blocking plate, and then tighten the connecting bolts one by one to compress the rubber sheet to achieve the sealing of each port. Obviously, this method is time-consuming and labor-intensive, and due to the uneven tightening force of each bolt, it is easy to cause the port to be poorly sealed, affecting the effective implementation of the detection work.

[0004] At the same time, a traditional measuring fixture is only for one specification of automobile exhaust manifold assembly. If it is necessary to perform pressure holding tests on automobile exhaust manifold assemblies of multiple specifications, multiple fixtures need to be set up, which will greatly increase the testing cost.

[0005] Therefore, a method or device capable of solving the above problems is now needed. Summary of the invention

[0006] The utility model aims to solve the above-mentioned deficiencies in the prior art and proposes an automobile exhaust manifold pressure maintaining detection device which has a simple structure, ingenious design, reasonable layout, can quickly and conveniently realize exhaust manifold pressure maintaining detection and has strong applicability.

[0007] The technical solution of the utility model is: a vehicle exhaust manifold pressure-maintaining detection device, a frame 1, a workbench 2 is fixedly arranged on the top of the frame 1, characterized in that: a first rubber plate 27 is pasted on the top surface of the workbench 2, a first guide rail 3 and a second guide rail 4 fixed on the frame 1 and parallel to each other are arranged on both sides of the workbench 2, a cylinder slide 5 is slidably connected to the first guide rail 3, a cylinder 7 is supported on the top of the cylinder slide 5 through a cylinder support frame 6, a pressure block 8 is hingedly connected to the working end of the cylinder 7 through a cylinder hinge 29, a second rubber plate 28 is pasted on the bottom end surface of the pressure block 8, and the bottom end surface of the pressure block 8 is matched and sealed with the intake flange surface of the workpiece 9 to be measured by compacting the second rubber plate 28, and a pressurized air path 10 is also opened in the pressure block 8, a pipe joint 11 is arranged at the inlet of the pressurized air path 10, and the outlet is located on the bottom end surface of the pressure block 8 and passes through the second rubber plate 28,

[0008] A plurality of back-rest slide seats 12 are slidably connected to the second guide rail 4, a back-rest cushion bracket 13 is disposed on the back-rest cushion bracket 13, and a back-rest cushion 14 is disposed on the back-rest cushion bracket 13.

[0009] Workpiece clamps are also provided on both sides of the workbench 2. The workpiece clamps are located in the area between the first guide rail 3 and the second guide rail 4. The workpiece clamps include a clamp support frame 15 fixedly connected to the frame 1 through a fixed connecting piece 30. A sliding sleeve 16 is provided on the clamp support frame 15. A driving rod 17 is movably connected in the sliding sleeve 16. The bottom end of the driving rod 17 is rotatably connected to the top end of a connecting rod 18. The bottom end of the connecting rod 18 is hinged to a rocker rod 19, and the top end of the rocker rod 19 is rotatably connected to the bottom end of the clamp support frame 15 through a rotating shaft. The horizontal height of the hinge point between the rocker rod 19 and the clamp support frame 15 is higher than the horizontal height of the hinge point between the connecting rod 18 and the rocker rod 19. The clamp support frame 15 is located below the workbench 2.

[0010] The top end of the driving rod 17 is connected to the center of the fixture plate 20 through a bolt 31 and a nut 32. The fixture plate 20 is located below the workbench 2. The relative distance between the fixture plate 20 and the workbench 2 can be adjusted by rotating the bolt 31, and the adjusted relative distance between the fixture plate 20 and the workbench 2 can be locked by further tightening the nut 33 so that its bottom surface abuts against the top end surface of the driving rod 17. Both ends of the fixture plate 20 are rotatably connected with a positioning ring 21, and a swing pressure positioning pin 22 is provided on the top of the positioning ring 21. The swing pressure positioning pin 22 matches the bolt countersunk hole on the workpiece 9 to be measured.

[0011] On both sides of the fixture plate 20, there are also limit frames 23 fixedly connected to the frame 1.

[0012] The frame 1 is also provided with an instrument support 24 , and an air pressure detection device 25 is provided on the instrument support 24 . The air pressure detection device 25 is connected to the inner cavity of the workpiece 9 to be measured through a pipeline.

[0013] There are 2n workpiece fixtures, where n is a natural number. Two adjacent workpiece fixtures form a group, and the bottom ends of the two rocker arms 19 in a group of workpiece fixtures are connected to each other through a linkage rod 26 .

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The automobile exhaust manifold pressure-maintaining detection device of this structural form has a simple structure, ingenious design and reasonable layout. It is designed to solve various problems existing in the process of air tightness detection of traditional automobile exhaust manifolds, and a special structure is designed. It can quickly and conveniently seal the exhaust manifold assembly and input gas with a certain pressure to perform pressure-maintaining detection operations. At the same time, it can also adjust the specific positions of the pressure block and the anti-cushion according to actual conditions, so as to adapt to the detection of exhaust manifold assemblies of different specifications, truly realizing "one machine for multiple uses", and can effectively reduce the cost pressure of the enterprise. In addition, the manufacturing process of the device is simple and the manufacturing cost is low. Therefore, it can be said that it has multiple advantages and is particularly suitable for promotion and application in this field. Its market prospect is very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model.

[0017] Figure 2 It is a side view of an embodiment of the utility model.

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the workpiece clamp part in the embodiment of the utility model.

[0019] Figure 4 It is a structural schematic diagram of the workpiece clamp part in the embodiment of the utility model.

[0020] Figure 5 It is a structural schematic diagram of the positioning ring part in the embodiment of the utility model. DETAILED DESCRIPTION

[0021] The specific implementation of the present utility model will be described below in conjunction with the accompanying drawings. Figures 1 to 5As shown: a vehicle exhaust manifold pressure-maintaining detection device, a frame 1, a workbench 2 is fixedly arranged on the top of the frame 1, characterized in that: a first rubber plate 27 is pasted on the top surface of the workbench 2, a first guide rail 3 and a second guide rail 4 fixed on the frame 1 and parallel to each other are arranged on both sides of the workbench 2, a cylinder slide 5 is slidably connected to the first guide rail 3, a cylinder 7 is supported on the top of the cylinder slide 5 through a cylinder support frame 6, a pressure block 8 is hingedly connected to the working end of the cylinder 7 through a cylinder hinge joint 29, a second rubber plate 28 is pasted on the bottom end surface of the pressure block 8, and the bottom end surface of the pressure block 8 is matched and sealed with the intake flange surface of the workpiece 9 to be measured by compacting the second rubber plate 28, and a pressurized air circuit 10 is also opened in the pressure block 8, a pipe joint 11 is arranged at the inlet of the pressurized air circuit 10, and the outlet is located on the bottom end surface of the pressure block 8 and passes through the second rubber plate 28,

[0022] A plurality of back-rest slide seats 12 are slidably connected to the second guide rail 4, a back-rest cushion bracket 13 is disposed on the back-rest cushion bracket 13, and a back-rest cushion 14 is disposed on the back-rest cushion bracket 13.

[0023] Workpiece clamps are also provided on both sides of the workbench 2. The workpiece clamps are located in the area between the first guide rail 3 and the second guide rail 4. The workpiece clamps include a clamp support frame 15 fixedly connected to the frame 1 through a fixed connecting piece 30. A sliding sleeve 16 is provided on the clamp support frame 15. A driving rod 17 is movably connected in the sliding sleeve 16. The bottom end of the driving rod 17 is rotatably connected to the top end of a connecting rod 18. The bottom end of the connecting rod 18 is hinged to a rocker rod 19, and the top end of the rocker rod 19 is rotatably connected to the bottom end of the clamp support frame 15 through a rotating shaft. The horizontal height of the hinge point between the rocker rod 19 and the clamp support frame 15 is higher than the horizontal height of the hinge point between the connecting rod 18 and the rocker rod 19. The clamp support frame 15 is located below the workbench 2.

[0024] The top end of the driving rod 17 is connected to the center of the fixture plate 20 through a bolt 31 and a nut 32. The fixture plate 20 is located below the workbench 2. The relative distance between the fixture plate 20 and the workbench 2 can be adjusted by rotating the bolt 31, and the adjusted relative distance between the fixture plate 20 and the workbench 2 can be locked by further tightening the nut 33 so that its bottom surface abuts against the top end surface of the driving rod 17. Both ends of the fixture plate 20 are rotatably connected with a positioning ring 21, and a swing pressure positioning pin 22 is provided on the top of the positioning ring 21. The swing pressure positioning pin 22 matches the bolt countersunk hole on the workpiece 9 to be measured.

[0025] On both sides of the fixture plate 20, there are also limit frames 23 fixedly connected to the frame 1.

[0026] The frame 1 is also provided with an instrument support 24 , and an air pressure detection device 25 is provided on the instrument support 24 . The air pressure detection device 25 is connected to the inner cavity of the workpiece 9 to be measured through a pipeline.

[0027] There are 2n workpiece fixtures, where n is a natural number. Two adjacent workpiece fixtures form a group, and the bottom ends of the two rocker arms 19 in a group of workpiece fixtures are connected to each other through a linkage rod 26 .

[0028] The working process of the automobile exhaust manifold pressure-maintaining detection device of the utility model embodiment is as follows: when it is necessary to perform an airtightness test on the automobile exhaust manifold, place the welded assembly (i.e., the workpiece 9 to be tested) on the workbench 2, adjust the relative positions of the multiple counter-rest slides 12 on the second guide rail 4, and let the counter-rest pads 14 thereon contact with the corresponding positions on the workpiece 9 to be tested, where the counter-rest pads 14 are pre-made, and their shapes match the shapes of the counter-rest points on the workpiece 9 to be tested; then operate all the workpiece fixtures to position and clamp the workpiece 9 to be tested on the workbench 2, so that the bottom surfaces of the flanges of the manifold holes of the workpiece 9 to be tested are tightly attached to the first rubber plate 27 to form a seal, and then adjust the relative position of the cylinder slide 5 on the first guide rail 3, so that the pressure block 8 moves to a position matching the air intake pipe on the workpiece 9 to be tested, start the cylinder 7, and the cylinder 7 drives the pressure The block 8 is pressed and adhered to the second rubber plate 28 on its bottom surface, so that it is closely fitted with the air inlet flange surface of the workpiece 9 to be tested to form a seal. At this time, the inner cavity of the workpiece 9 to be tested is in a closed state (except for the pressurized air circuit 10, all other air inlets and outlets are blocked). The air outlet pipeline of the air pump is connected to the pipe joint 11, and air is injected into the inner cavity of the workpiece 9 to be tested by the air pump, and the reading of the air pressure detection device 25 is observed. After the air pressure reaches a predetermined value, the air pump is stopped, and the inflation pipe connected to the pipe joint 11 and the air pressure detection device 25 is blocked away from the intersection with the air valve switch. At this time, the inner cavity of the workpiece 9 to be tested and the air pressure detection device 25 are in the same cavity and are in a pressure-maintaining state. After maintaining the pressure for a certain period of time, the reading of the air pressure detection device 25 is observed. If the reading decay exceeds the standard value, it means that the air tightness of the workpiece 9 to be tested does not meet the requirements, otherwise it meets the requirements;

[0029] Since the cylinder slide 5 and the plurality of back slides 12 in the device can be adjusted within a certain range, the device can be applied to the air tightness detection of automobile exhaust manifold assemblies of different specifications, has strong versatility, and can effectively reduce costs;

[0030] The working process of the workpiece clamp is as follows: in the initial state, the workpiece clamp is in a non-clamping state, at this time, the two positioning rings 21 in one workpiece clamp are in an open state, at this time, the positioning ring 21 and the clamp plate 20 are distributed at an obtuse angle, and the outer side of the positioning ring 21 is placed on the limit frame 23;

[0031] When the workpiece clamp is needed to clamp and position the workpiece 9 to be measured, first pull the two positioning rings 21 to swing them to a state perpendicular to the clamp plate 20. At this time, the swing pressure positioning pins 22 on the top of the two positioning rings 21 are located directly above the bolt holes opened on the workpiece 9 to be measured. Then the two workpiece clamps are driven to move through the linkage rod 26, and the swing rod 19 in the workpiece clamp swings, pulling the connecting rod 18 hinged thereto to move downward. The connecting rod 18 and the driving rod 17 drive the clamp plate 20 downward, driving the two positioning rings 21 downward together, and the swing pressure positioning pins 22 located at the top of the positioning ring 21 are inserted into the corresponding bolt countersunk holes below them. At this time, the connecting rod 18 and the driving rod 17 are in line, and the two positioning rings 21 are tightened, thereby realizing the clamping operation of the workpiece 9 to be measured.

[0032] The clamping force on the workpiece 9 can be adjusted in advance by rotating and tightening the bolts 31, nuts 32 and nuts 33 to adjust the relative distance between the fixture plate 20 and the worktable plate 2, thereby changing the pull-down stroke.

[0033] When it is necessary to release the clamping of the workpiece 9 to be measured, the linkage rod 26 is driven to move, so that it drives the two rocker arms 19 to swing in the opposite direction. The above-mentioned action is performed in reverse, the fixture plate 20 moves upward, and the swing pressure positioning pin 22 is pulled out from the bolt countersunk hole. The workpiece fixture is out of contact with the workpiece 9 to be measured, and then the two positioning rings 21 are pulled to make them contact with the limit frames 23 on both sides of the workpiece 9 to be measured again. There is no obstruction directly above the workpiece 9 to be measured, and it can be removed from the workbench 2.

Claims

1. An automobile exhaust manifold pressure-maintaining detection device, comprising a frame (1), a workbench (2) being fixedly arranged on the top of the frame (1), characterized in that: A first rubber sheet (27) is adhered to the top surface of the workbench (2); a first guide rail (3) and a second guide rail (4) are provided on both sides of the workbench (2) and are fixed to the frame (1) and are parallel to each other; a cylinder slide seat (5) is slidably connected to the first guide rail (3); a cylinder (7) is supported on the top of the cylinder slide seat (5) via a cylinder support frame (6); a pressure block (8) is hingedly connected to the working end of the cylinder (7) via a cylinder hinge joint (29); a second rubber sheet (28) is adhered to the bottom end surface of the pressure block (8); the bottom end surface of the pressure block (8) is matched and sealed with the air inlet flange surface of the workpiece (9) to be measured by compacting the second rubber sheet (28); a pressurized air path (10) is also provided in the pressure block (8); a pipe joint (11) is provided at the inlet of the pressurized air path (10); and an outlet is located on the bottom end surface of the pressure block (8) and passes through the second rubber sheet (28). A plurality of back-rest slide seats (12) are slidably connected to the second guide rail (4), a back-rest cushion bracket (13) is provided on the back-rest cushion bracket (13), and a back-rest cushion (14) is provided on the back-rest cushion bracket (13). Workpiece clamps are also provided on both sides of the workbench (2). The workpiece clamps are located in the area between the first guide rail (3) and the second guide rail (4). The workpiece clamps include a clamp support frame (15) fixedly connected to the frame (1) via a fixed connecting piece (30). A sliding sleeve (16) is provided on the clamp support frame (15). A driving rod (17) is movably connected in the sliding sleeve (16). The bottom end of the driving rod (17) is rotatably connected to the top end of the connecting rod (18). The bottom end of the connecting rod (18) is hinged to the swing rod (19), and the top end of the swing rod (19) is rotatably connected to the bottom end of the clamp support frame (15) via a rotating shaft. The horizontal height of the hinge point between the swing rod (19) and the clamp support frame (15) is higher than the horizontal height of the hinge point between the connecting rod (18) and the swing rod (19). The clamp support frame (15) is located below the workbench (2). The top end of the driving rod (17) is connected to the center of the fixture plate (20) through a bolt (31) and a nut (32). The fixture plate (20) is located below the workbench (2). The relative distance between the fixture plate (20) and the workbench (2) can be adjusted by rotating the bolt (31). The adjusted relative distance between the fixture plate (20) and the workbench (2) can be locked by further tightening the nut (33) so that its bottom surface abuts against the top end surface of the driving rod (17). Both ends of the fixture plate (20) are rotatably connected to a positioning ring (21). A swing pressure positioning pin (22) is provided on the top of the positioning ring (21). The swing pressure positioning pin (22) matches the bolt countersunk hole on the workpiece (9) to be measured. Limiting frames (23) fixedly connected to the frame (1) are also provided on both sides of the fixture plate (20). The frame (1) is also provided with an instrument bracket (24), and an air pressure detection device (25) is provided on the instrument bracket (24). The air pressure detection device (25) is connected to the inner cavity of the workpiece (9) to be measured through a pipeline.

2. The automobile exhaust manifold pressure-maintaining detection device according to claim 1, characterized in that: There are 2n workpiece fixtures, where n is a natural number, and two adjacent workpiece fixtures form a group. The bottom ends of two swing rods (19) in a group of workpiece fixtures are connected to each other via a linkage rod (26).

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