An engine cylinder head airtightness detection device and its usage method

Abstract

An airtightness detection device and usage method for an engine cylinder head, belonging to the field of engine assembly. It includes a flapping mechanism, a detection mechanism, and a lifting and positioning mechanism arranged on a frame body; the lifting and positioning mechanism is used to drive a lifting bracket to move the engine cylinder head through a lifting motor; the flapping mechanism is used to drive a flapping rod to reciprocate through a rotating camshaft to flap the valve; the detection mechanism is used to block the flapped engine cylinder head by moving a plurality of blocking plates and inflate the engine cylinder head for detection. The lifting and positioning device of the present invention first lifts the engine cylinder head and uses the flapping device to flap the valve, and then performs airtightness detection through the detection device, which can effectively improve the airtightness of the engine cylinder head.

Description

Technical Field

[0001] The present invention relates to the field of engine assembly, and particularly to an airtightness detection device for an engine cylinder head and a usage method thereof. Background Art

[0002] Currently, during the engine assembly process, the airtightness detection of the engine cylinder head is a very important step. The airtightness of the engine cylinder head directly affects the combustion performance of the engine, the efficiency of gasoline, etc. And the fitting degree between the valve stem and the valve seat will directly affect the airtightness of the engine cylinder head. Currently, there is no integrated device that can improve the airtightness of the engine cylinder head by improving the fitting degree between the valve stem and the valve seat. Summary of the Invention

[0003] To solve the problem that there is no integrated device to improve the airtightness of the engine cylinder head by improving the fitting degree between the valve stem and the valve seat, the present invention provides an airtightness detection device for an engine cylinder head and a usage method thereof.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A leak detection device for an engine cylinder head, comprising a flapping mechanism, a detection mechanism, and a lifting and positioning mechanism disposed on a frame; the lifting and positioning mechanism is used to drive a lifting bracket to move the engine cylinder head through a lifting motor; the flapping mechanism is used to drive a flapping rod to reciprocate to flap the valve by rotating a camshaft; the detection mechanism is used to block the flapped engine cylinder head by moving a plurality of blocking plates and inflate the engine cylinder head for detection.

[0005] Further, the lifting motor drives a rotating shaft B connected to a slider to rotate around the axis of the lifting motor through a connecting member, so that the slider moves in the chute of the lifting bracket, driving the lifting bracket to perform a lifting motion.

[0006] Further, the camshaft is disposed on a support block, and the support block is provided with a flapping assembly. A flapping motor drives the camshaft to rotate, so that the camshaft drives the flapping rod to perform a reciprocating motion in the flapping assembly.

[0007] Further, the outer sleeve of the flapping assembly is fixedly connected to the support block. A pair of copper inner sleeves are fixed inside the outer sleeve. The flapping rod performs a reciprocating motion inside the inner sleeve. A spring is sleeved on the flapping rod. The spring is located between the boss of the flapping rod and the flapping assembly, and a pair of flapping rods in one flapping assembly are rotatably connected to one cam on the camshaft.

[0008] Further, the flapping mechanism includes a pressing assembly for clamping the engine cylinder head in cooperation with the supporting force of the lifting and positioning mechanism.

[0009] Further, the pressing assembly includes a pressing plate elastically connected to the support block, and a buffer plate is provided on the surface of the pressing plate that comes into contact with the engine cylinder head.

[0010] Further, the plurality of blocking plates are respectively arranged on both sides of the detection position of the engine cylinder head, and the blocking plates are all elastically connected to the corresponding transition plates. When blocking, one of the blocking plates is pushed by a blocking cylinder, and the other blocking plate is driven by the contraction of another blocking cylinder.

[0011] Further, the transition plate on one side of the detection position is connected to the corresponding blocking cylinder through a floating joint, and a guide rod is connected to the transition plate.

[0012] Further, the transition plate on the other side of the detection position is fixed at one end of a connecting frame, the other end of the connecting frame is connected to the corresponding blocking cylinder through a floating joint, and the connecting frame is slidably connected to a flapping mechanism.

[0013] Further, the blocking plate is provided with an inflation hole corresponding to the air port of the engine cylinder head, and the leak detector inflates the engine cylinder head through the inflation hole for detection.

[0014] A method for using an airtightness detection device for an engine cylinder head includes the following steps:

[0015] S1: The lifting and positioning device lifts the engine cylinder head to the flapping position;

[0016] S2: The flapping device flaps the valves of the engine cylinder head;

[0017] S3: The lifting and positioning device lowers the engine cylinder head to the detection position;

[0018] S4: The detection device detects the engine cylinder head;

[0019] S5: The lifting and positioning device lowers the engine cylinder head to the original position.

[0020] The beneficial effects of the present invention are as follows: The lifting and positioning device first lifts the engine cylinder head and uses the flapping device to flap the valves, and then performs airtightness detection through the detection device, which can effectively improve the airtightness of the engine cylinder head. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the present invention;

[0022] Figure 2 is a front view of the present invention;

[0023] Figure 3 is a side view of the present invention;

[0024] Figure 4 is a side view of the working state of the present invention;

[0025] Figure 5 is a schematic structural diagram of the frame body of the present invention;

[0026] Figure 6 This is a schematic structural view of the lifting and positioning device of the present invention;

[0027] Figure 7 This is a schematic structural view of the lifting and positioning device of the present invention;

[0028] Figure 8 This is a top view of the lifting and positioning device of the present invention;

[0029] Figure 9 This is a side view of the lifting and positioning device of the present invention;

[0030] Figure 10 This is a schematic structural view of the flapping device of the present invention;

[0031] Figure 11 This is a schematic structural view of the flapping device of the present invention;

[0032] Figure 12 This is a partial schematic structural view of the flapping device of the present invention;

[0033] Figure 13 This is a front view of the flapping device of the present invention;

[0034] Figure 14 This is a partial sectional view of the pressing component of the present invention;

[0035] Figure 15 This is a side view of the flapping device of the present invention;

[0036] Figure 16 This is a side sectional view of the flapping device of the present invention;

[0037] Figure 17 This is a schematic structural view of the flapping component of the present invention;

[0038] Figure 18 This is a top view of the detection device of the present invention;

[0039] Figure 19 This is a side view of the detection device of the present invention;

[0040] Figure 20 This is a schematic view of the inflation holes on the air intake blocking plate of the present invention.

[0041] In the figure: 1. Frame body, 101. Base, 102. Anchor feet, 103. Column, 2. Lifting and positioning device, 201. Positioning rod, 202. Lifting bracket, 203. Part A, 204. Bearing seat, 205. Transmission shaft A, 206. Guide rail A, 207. Transmission sleeve, 208. Motor bracket, 209. Lifting motor, 210. Connecting piece, 211. Rotating shaft B, 212. Diamond pin, 213. Round pin, 214. Positioning block, 215. Part B, 3. Beating device, 301. Mounting plate, 302. Mounting frame, 303. Adjusting block, 304. Protective plate, 305. Protective pad, 306. Beating frame body, 307. Mounting block, 308. Limiting sleeve, 309. Positioning head, 310. Buffer plate, 311. Pressing plate, 312. Guide sleeve, 313. Pulley B, 314. Pulley A, 315. Beating motor, 316. Tensioning pulley, 317. Support block, 318. Positioning pin, 319. Bearing, 320. Outer sleeve, 321. Inner sleeve, 322. Lower end cover, 323. Beating rod, 324. Camshaft, 4. Detection device, 401. Guide rod, 402. Exhaust transition plate, 403. Exhaust plugging plate, 404. Bump block, 405. Connecting rod, 406. Stopper, 407. Intake plugging plate, 408. Cylinder bracket, 409. Linear bearing, 410. Exhaust plugging cylinder, 411. Intake plugging cylinder, 412. Guide rail B, 413. Intake transition plate, 414. Connecting frame, 415. Connecting plate, 416. Floating block, 417. Floating head, 418. Intake head, 5. Conveyor line, 6. Engine cylinder head. Detailed implementation mode

[0042] The leak detection device for the engine cylinder head in this embodiment includes a lifting and positioning device 2, a detection device 4, and a beating device 3 that are sequentially arranged on the frame body 1 from bottom to top;

[0043] The frame body 1 includes a column 103 vertically arranged on the base 101, and the base 101 is provided with a plurality of anchor feet 102 for adjusting the height and levelness of the equipment;

[0044] One end of the top of the lifting bracket 202 of the lifting and positioning device 2 is provided with a platform, and a plurality of positioning rods 201 are arranged on the platform. A positioning block 214 is arranged on the top of the positioning rod 201, and a round pin 213 or a diamond pin 212 may also be arranged on the top of the positioning block 214 for positioning the engine cylinder head 6. The vertical plate at the other end of the lifting bracket 202 is slidably connected to the column 103 through the guide rail A206. A chute is arranged in the middle of the vertical plate, and the slider moves horizontally in the chute. The slider is divided into a part A203 and a part B215. Both the part A203 and the part B215 are T-shaped block structures (the part A203 and the part B215 may also adopt one as a T-shaped block structure and the other as a flat plate structure), as Figure 7As shown, the A part 203 and the B part 215 are connected by bolts in the slide groove from opposite sides of the vertical plate to form a slider, so that the slider is stuck in the slide groove and can move horizontally in the slide groove; the lifting motor 209 of the lifting and positioning device 2 is fixed on the motor bracket 208 set on the base 101, and the rotating shaft of the lifting motor 209 is connected to the transmission shaft A205 through the transmission sleeve 207. The rotating shaft and the transmission shaft A205 are connected to the transmission sleeve 207 through a key, and the transmission shaft A205 is installed on the motor bracket 208 through the bearing seat 204. Figure 7 The transmission shaft A205 is fixedly connected to one end of the connecting member 210, and the other end of the connecting member 210 is rotatably connected to the rotating shaft B211. The rotating shaft B211 is fixedly connected to the slider. The connecting member 210 is located between the slider and the lifting motor 209, so that when the transmission shaft A205 rotates, the rotating shaft B211 rotates around the axis of the transmission shaft A205, thereby driving the lifting bracket 202 to perform lifting and lowering movements along the guide rail A206; the lifting positioning device 2 of this embodiment is driven by a motor, which can stop the lifting bracket 202 at multiple positions and maintain a reliable supporting force when stopping. Since the device is provided with a flapping device 3, a downward force will be generated on the engine cylinder head 6 when flapping, so it is particularly important to maintain a reliable supporting force, and there is no need to add other locking mechanisms;

[0045] The flapping frame 306 of the flapping device 3 is a double-layer structure and is fixedly connected to the column 103. The flapping motor 315 is fixed on the top layer through the mounting plate 301. The rotating shaft of the flapping motor 315 is provided with a pulley A314. The bottom plate of the bottom layer is fixed with a support block 317 for mounting a cam shaft 324, and the cam shaft 324 is located in the bottom layer; Figure 12 As shown, camshafts 324 are provided on both sides of the top of the support block 317. The camshafts 324 are installed on the support block 317 through multiple mounting blocks 307. The mounting blocks 307 are provided with limit sleeves 308 for limiting the axial movement of the camshafts 324. Pulleys B313 are provided on the same side of the two camshafts 324. The two pulleys B313 and the pulley A314 form a triangular belt transmission mechanism, as shown in FIG. Figure 10 As shown, the top layer is also provided with a mounting frame 302 for mounting a tensioning wheel 316 and an adjusting block 303 for adjusting the position of the tensioning wheel 316. The adjusting block 303 is provided with a threaded rod for driving the mounting frame 302 to move. The position of the tensioning wheel 316 is adjusted by adjusting the position of the mounting frame 302, thereby adjusting the tension of the belt transmission mechanism. Figure 12 , Figure 16 and Figure 17As shown in the figure, there are multiple passages for installing the flapping components on both sides of the support block 317. The flapping components are provided with a pair of telescopically movable flapping rods 323. The flapping components are used to define the movement direction of the flapping rods 323. The cams on the camshaft 324 are located between the two flapping rods 323 of the corresponding flapping components. Bearings 319 for passing through the positioning pins 318 are provided at the tops of the flapping rods 323. The positioning pins 318 pass through the bearings 319 and the cams to rotatably connect the cams and the flapping rods 323. The top of the outer sleeve 320 of the flapping component extends into the support block 317 from the bottom of the passage and is fixedly connected to the support block 317. The outer sleeve 320 is provided with two through holes, and two inner sleeves 321 are provided in the through holes. Upper end caps connected to the outer sleeve 320 are provided at the tops of the inner sleeves 321. Lower end caps 322 connected to the outer sleeve 320 are provided at the bottoms of the inner sleeves 321. The flapping rods 323 pass through the upper end caps, the inner sleeves 321 and the lower end caps 322 and can reciprocate. The flapping rods 323 are provided with bosses, and springs are provided between the bosses and the upper end caps; the upper end caps and the lower end caps 322 play a role in preventing the inner sleeves 321 from slipping out. At the same time, the upper end caps also play a role in preventing the springs from being damaged by friction with the inner sleeves 321. The inner sleeves 321 are made of copper, which can effectively reduce the friction when the flapping rods 323 reciprocate; a row of flapping components and flapping rods 323 connected to one camshaft 324 and a row of flapping components and flapping rods 323 connected to another camshaft 324 are arranged in a V shape. A pressing component is provided between the two rows of flapping components, and the pressing component is installed at the bottom of the support block 317. The guide sleeve 312 of the pressing component is connected to the support block 317 by bolts. A radial boss is provided at the bottom of the guide sleeve 312. A space for the radial boss to reciprocate in the vertical direction is provided in the pressing plate 311. The aperture at the top of the space contracts to prevent the radial boss from slipping out. A spring is provided outside the guide sleeve 312, and the spring is located between the pressing plate 311 and the support block 317. A buffer plate 310 made of an elastic material is provided at the bottom of the pressing plate 311. The buffer plate 310 plays a role in protecting the engine cylinder head 6, and at the same time can prevent the radial boss from slipping out from the bottom of the space. A positioning head 309 passing through the buffer plate 310 is also installed at the bottom of the pressing plate 311. The positioning head 309 is used to position the engine cylinder head 6; an observation window is opened on the side wall of the bottom layer. A protective pad 305 is provided at the edge of the observation window. A transparent protective plate 304 is pressed on the protective pad 305 and covers the observation window for installing and observing the operation conditions inside the bottom layer. The camshaft 324 is preferably the camshaft of the engine applied to the engine cylinder head 6 to be tested, which can effectively improve the flapping effect;

[0046] The detection device 4 includes an intake air blocking mechanism and an exhaust air blocking mechanism; the connecting frame 414 of the intake air blocking mechanism is slidably connected to the bottom of the flapping body 306 through the guide rail B412, and the middle of the connecting frame 414 is hollowed out for passing through the flapping assembly and the pressing assembly. One end of the connecting frame 414 is connected to the shaft of the intake air blocking cylinder 411 through a floating joint. Specifically, the floating block 416 of the floating joint is fixed to one end of the connecting frame 414 through the connecting plate 415, and the floating head 417 of the floating joint is installed at the end of the shaft of the intake air blocking cylinder 411. The gap between the floating head 417 and the floating block 416 is used to eliminate errors. The other end of the connecting frame 414 is bent downward, and an intake air transition plate 413 is provided on the side of the bent end facing the engine cylinder head 6. The intake air transition plate 413 installs the intake air blocking plate 407 through the connecting rod 405. A spring is provided outside the connecting rod 405, and one end of the connecting rod 405 located in the intake air blocking plate 407 can perform telescopic movement within the intake air blocking plate 407. The intake air transition plate 413 is provided with a striker 404, and the intake air blocking plate 407 is provided with a stopper 406. When the striker 404 contacts the stopper 406, the shaft of the intake air blocking cylinder 411 installed on the cylinder bracket 408 stops contracting; the exhaust air blocking cylinder 410 of the exhaust air blocking mechanism is installed on the cylinder bracket 408, and the cylinder bracket 408 is fixedly connected to the column 103. The shaft of the exhaust air blocking cylinder 410 is connected to the exhaust air transition plate 402 through a floating joint. The cylinder bracket 408 is also provided with a linear bearing 409, and the guide rod 401 passes through the linear bearing 409 and is connected to the exhaust air transition plate 402. The exhaust air transition plate 402 installs the exhaust air blocking plate 403 through the connecting rod 405, and the exhaust air transition plate 402 is provided with a striker 404, and the exhaust air blocking plate 403 is provided with a stopper 406; the exhaust air blocking plate 403 is provided with an inflation hole corresponding to the exhaust port on the exhaust surface of the engine cylinder head 6, and this inflation hole communicates with the intake head 718 connected to the exhaust air blocking plate 403, and is used to inflate the engine cylinder head 6 through the exhaust port. The intake air blocking plate 407 is provided with an inflation hole corresponding to the intake port on the intake surface of the engine cylinder head 6, and this inflation hole communicates with the intake head 718 connected to the intake air blocking plate 407, and is used to inflate the engine cylinder head 6 through the intake port. The other end of the gas passage where the inflation hole is located is connected to the intake head 718, and the leak detector is connected to the intake head 718 for inflation and leak detection;

[0047] This embodiment is a part of the production line of the engine cylinder head 6 and is used for detection after the assembly of the engine cylinder head 6 is completed. For example, Figure 4As shown in the figure, the tray on which the engine cylinder head 6 is placed is conveyed by the conveying line 5. When it is conveyed to this equipment, the lifting and positioning device 2 lifts the engine cylinder head 6 to the slapping position, and the slapping device 3 slaps the valves of the engine cylinder head 6 for a certain period of time. Then, the lifting and positioning device 2 lowers the engine cylinder head 6 to the detection position, and the detection device 4 detects the airtightness of the assembled engine cylinder head 6. On the one hand, the slapping device 3 can improve the tightness between the valve stem and the seat ring. On the other hand, it can detect whether the lock piece used to lock the valve stem on the valve is firm. The detection device 4 is used to detect the airtightness of the engine cylinder head 6 itself, the valve stem and the oil seal installation. At the same time, if the lock piece is not installed firmly, the airtightness will be abnormal after slapping, so as to judge whether it is installed stably.

[0048] The specific usage method of this embodiment is as follows: The lifting motor 209 runs to drive the transmission shaft A205 to rotate, so that the rotating shaft B211 rotates around the axis of the transmission shaft A205. Thus, the lifting bracket 202 is driven by the slider to rise along the guide rail A206, so that the engine cylinder head 6 rises and reaches the highest position, that is, the slapping position. The lifting motor 209 stops running. At this time, the top of the engine cylinder head 6 contacts the buffer plate 310 and the spring of the pressing component is in a compressed state. The position of the engine cylinder head 6 is limited by the elastic force of the pressing component and the supporting force of the lifting and positioning device 2, so that it remains stable during the subsequent slapping process. The slapping motor 315 starts to run and drives the camshaft 324 to rotate, so that the slapping rod 323 makes a reciprocating motion in the slapping component to slap the valve. After running for a certain time, the slapping motor 315 stops running, and the lifting motor 209 continues to run to lower the engine cylinder head 6 to the detection position. At this time, the shaft of the intake air blocking cylinder 411 shrinks, and drives the intake air blocking plate 407 to move towards the intake air surface side of the engine cylinder head 6 through the connecting frame 414. When the striker 404 and the stopper 406 of the intake air blocking mechanism contact, the intake air blocking cylinder 411 stops moving. At this time, the intake air blocking plate 407 is in close contact with the intake air surface of the engine cylinder head 6. While the intake air blocking cylinder 411 is moving, the shaft of the exhaust air blocking cylinder 410 extends, driving the exhaust air blocking plate 403 to move towards the exhaust air surface side of the engine cylinder head 6. When the striker 404 and the stopper 406 of the exhaust air blocking mechanism contact, the exhaust air blocking cylinder 410 stops moving. At this time, the exhaust air blocking plate 403 is in close contact with the exhaust air surface of the engine cylinder head 6. The leak detector starts to run for airtightness detection. After the detection is completed, the intake air blocking cylinder 411 and the exhaust air blocking cylinder 410 return to their original positions. Then, the lifting motor 209 continues to run to lower the engine cylinder head 6 to its original position.

[0049] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered within the protection scope of the present invention.

Claims

1. An engine cylinder head leak detection device, characterized in that, It includes a flapping device (3), a detection device (4) and a lifting and positioning device (2) provided on a frame body (1); the lifting and positioning device (2) is used to drive a lifting bracket (202) to move an engine cylinder head (6) through a lifting motor (209); the flapping device (3) is used to drive a flapping rod (323) to reciprocate through a rotating camshaft (324) to flap a valve; the detection device (4) is used to block the flapped engine cylinder head (6) by moving a plurality of blocking plates and inflate and detect the inside of the engine cylinder head (6); The lifting motor (209) drives a rotating shaft B (211) connected to a slider to rotate around the axis of the lifting motor (209) through a connecting member (210), so that the slider moves in a chute of the lifting bracket (202), driving the lifting bracket (202) to perform a lifting motion; The camshaft (324) is arranged on a support block (317), the support block (317) is provided with a flapping assembly, and a flapping motor (315) drives the camshaft (324) to rotate, so that the camshaft (324) drives the flapping rod (323) to reciprocate in the flapping assembly; The outer sleeve (320) of the flapping assembly is fixedly connected to the support block (317), a pair of copper inner sleeves (321) are fixed inside the outer sleeve (320), the flapping rod (323) reciprocates inside the inner sleeve (321), a spring is sleeved on the flapping rod (323), the spring is located between the boss of the flapping rod (323) and the flapping assembly, and a pair of flapping rods (323) in one flapping assembly are rotatably connected to a cam on the camshaft (324); The flapping device (3) includes a pressing assembly for clamping the engine cylinder head (6) in cooperation with the supporting force of the lifting and positioning device (2); The pressing assembly includes a pressing plate (311) elastically connected to the support block (317), and a buffer plate is provided on the surface of the pressing plate (311) in contact with the engine cylinder head (6); the plurality of blocking plates are respectively arranged on both sides of the detection position of the engine cylinder head (6), and the blocking plates are all elastically connected to corresponding transition plates. During blocking, the blocking plate on one side is pushed by a blocking cylinder, and the blocking plate on the other side is driven by the contraction of another blocking cylinder.

2. The leak detection device for the engine cylinder head according to claim 1, characterized in that The transition plate on one side of the detection position is connected to the corresponding blocking cylinder through a floating joint, and a guide rod (401) is connected to the transition plate; the transition plate on the other side of the detection position is fixed at one end of a connecting frame (414), the other end of the connecting frame (414) is connected to the corresponding blocking cylinder through a floating joint, and the connecting frame (414) is slidably connected to the flapping device (3).

3. The engine cylinder head leak detection device according to any one of claims 1-2, characterized in that, The blocking plate is provided with an inflation hole corresponding to the air port of the engine cylinder head (6), and a leak detector inflates and detects the inside of the engine cylinder head (6) through the inflation hole.

4. A method for using a leak detection device for an engine cylinder head as described in claim 1, characterized in that, It includes the following steps: S1: The lifting and positioning device (2) lifts the engine cylinder head (6) to the flapping position; S2: The flapping device (3) flaps the valve of the engine cylinder head (6); S3: The lifting and positioning device (2) lowers the engine cylinder head (6) to the detection position; S4: The detection device (4) detects the engine cylinder head (6); S5: The lifting and positioning device (2) lowers the engine cylinder head (6) to its original position.

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