Air tightness detection device for intake manifold

Abstract

The utility model discloses an air tightness detection device for an intake manifold, which comprises a working table, a first plugging mechanism, a second plugging mechanism and a third plugging mechanism, the intake manifold is positioned on the top surface of the working table, the first plugging mechanism and the third plugging mechanism are both positioned above the working table, the first plugging mechanism comprises a plurality of plugging units arranged at intervals, and the second plugging mechanism comprises a plurality of plugging units arranged at intervals. Each plugging unit comprises a positioning column, a connecting plate, a plug and a sealing ring, a positioning hole penetrating through the thickness direction of the connecting plate and used for allowing the positioning column to penetrate through is formed in the connecting plate, and the diameter of the positioning hole is larger than the outer diameter of the positioning column; the plug is fixedly connected with one end of the positioning column, the periphery of the plug is sleeved with the sealing ring, and the plug and the sealing ring are jointly used for sealing the oil gas injection hole; and the third plugging mechanism is used for sealing a screw hole of the intake manifold. The air tightness detection device provided by the utility model can detect the air tightness of the intake manifold and detect the diameter and the location degree of the oil injection gas hole on the intake manifold at the same time, thereby effectively improving the working efficiency and the qualified rate of products.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of intake manifold, concretely relates to airtight detection device of intake manifold. BACKGROUND

[0002] Intake manifold is located between the throttle and the engine intake valve, is the key component in the engine intake system, and the oil injection gas hole on each branch pipe of the intake manifold has very important role. The oil injection nozzle on the automobile is installed together with the oil injection gas hole on each branch pipe of the intake manifold, and the automobile oil injection nozzle is actually a simple electromagnetic valve. When the electromagnetic coil is electrified, suction force is generated, the needle valve is sucked up, the injection hole is opened, fuel is injected at high speed through the annular gap between the shaft needle of the needle valve head and the injection hole, forms mist oil droplets and mixes with the gas flowing out of each branch pipe of the intake manifold, and is injected into each cylinder through the branch pipe intake port connected with the engine cylinder to better improve the combustion efficiency.

[0003] Therefore, the position degree of the oil injection gas hole on each branch pipe of the intake manifold and the size of the hole are the factors seriously affecting whether the engine is fully combusted. Therefore, in production, the airtightness of the intake manifold and the position degree and size of the oil injection gas hole on each branch pipe are all detected whether qualified, and in the prior art, these need to be detected separately, which is time-consuming, reduces work efficiency, and increases production cost. UTILITY MODEL CONTENTS

[0004] Therefore, in order to solve the problems in the prior art, the utility model provides an airtight detection device of an intake manifold with improved structure, which can detect whether the position degree and hole diameter of the oil injection gas hole on each branch pipe of the intake manifold are qualified while detecting the airtightness of the intake manifold.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An airtight detection device of an intake manifold, the intake manifold has a plurality of screw holes and oil injection gas holes, the airtight detection device comprises a workbench, a first plugging mechanism, a second plugging mechanism and a third plugging mechanism, the intake manifold is located on the top surface of the workbench, the first plugging mechanism and the third plugging mechanism are both located above the workbench, the first plugging mechanism comprises a plurality of plugging units arranged at intervals, each plugging unit comprises a positioning column, a connecting plate, a plug and a sealing ring, the connecting plate is provided with a positioning hole penetrating through the thickness direction thereof, the positioning hole is used for allowing the positioning column to pass through, and the diameter of the positioning hole is greater than the outer diameter of the positioning column; the plug is fixedly connected with one end of the positioning column, the sealing ring is sleeved on the outer periphery of the plug, and the plug and the sealing ring are used for sealing the oil injection gas hole together; the third plugging mechanism is used for sealing the screw hole of the intake manifold.

[0007] The plug sealing oil injection hole is designed by simulating the cooperation relationship between the actual oil injection nozzle and the oil injection hole, the first sealing mechanism, the second sealing mechanism and the third sealing mechanism are simultaneously arranged, and the positioning column and the positioning hole in the first sealing mechanism are in clearance fit, the size of the clearance between the two is related to the position degree of the oil injection hole, when the position degree of the oil injection hole is unqualified, the plug cannot be inserted into the oil injection hole; when the position of the oil injection hole has deviation, as long as the position degree is within the range, the plug can be inserted into the oil injection hole, and the sealing ring is used to seal the oil injection hole to complete the air tightness detection; if the diameter of the oil injection hole is unqualified, the sealing ring cannot seal the oil injection hole, and the air tightness detection cannot be carried out. Therefore, only when the diameter and the position degree of the oil injection hole are both qualified, the air tightness detection of the intake manifold will pass, which can not only complete the air tightness detection of the intake manifold, but also detect the diameter and the position degree of the oil injection hole, and simulate the state that the oil injection nozzle is installed on the intake manifold, so that the working efficiency and the qualified rate of products can be effectively improved.

[0008] According to some preferred embodiments of the utility model, the positioning column comprises a first part, a second part and a third part, two ends of the second part are fixedly connected with the first part and the third part respectively, and one end of the third part, away from the second part, is fixedly connected with one end of the plug.

[0009] According to some preferred embodiments of the utility model, the first part penetrates the positioning hole, the diameter of the positioning hole is greater than the outer diameter of the first part, the outer diameter of the second part is greater than the outer diameters of the first part and the third part, the outer diameter of the third part is greater than the outer diameter of the plug, one side of the sealing ring is in contact with one end of the third part, and the inner diameter of the sealing ring is smaller than the outer diameter of the third part.

[0010] In some embodiments of the utility model, the difference between the diameter of the positioning hole and the outer diameter of the first part is calculated by the position degree of the oil injection hole theory and combined with the Pythagorean theorem.

[0011] According to some preferred embodiments of the utility model, each sealing unit further comprises an elastic member, the elastic member is sleeved on the outer periphery of the first part, one end of the elastic member is in abutment with one end of the second part, the other end of the elastic member is in abutment with the side of the connecting plate close to the plug, the inner diameter of the elastic member is smaller than the outer diameter of the second part, and the outer diameter of the elastic member is greater than the diameter of the positioning hole. The setting of the elastic member can play a good buffering role to prevent the plug from bruising the product, and can also tighten the plug to avoid the shaking of the plug due to the clearance between the positioning column and the positioning hole.

[0012] According to some preferred embodiments of the utility model, the outer wall of the first part is provided with external threads, a gasket and a bolt are sleeved on one end of the first part away from the second part, the gasket is located between one side of the connecting plate and the bolt, the outer diameter of the gasket is greater than the diameter of the positioning hole, and the inner wall of the bolt is threadedly connected with the outer wall of the first part.

[0013] According to some preferred embodiments of the utility model, the number of the plugging units is equal to the number of the oil injection holes, the plugs are arranged in one-to-one correspondence with the oil injection holes, and the axial center lines of the plugs coincide with the axial center lines of the oil injection holes.

[0014] According to some preferred embodiments of the utility model, the first plugging mechanism further comprises a connecting block, a fixing block, a first driver and a first fixing seat, a plurality of the plugging units are arranged on the connecting block at intervals, and one side of the connecting plate in each of the plugging units is fixedly connected with one side of the connecting block; the connecting block is located below the fixing block, one or more connecting columns are arranged between the connecting block and the fixing block, the connecting columns are used for fixedly connecting the connecting block and the fixing block, one end of the telescopic shaft of the first driver is fixedly connected with one side of the fixing block, the shell of the first driver is fixedly connected with one side of the first fixing seat, and the first driver is used for driving the fixing block to move back and forth in the first direction.

[0015] According to some preferred embodiments of the utility model, the first fixing seat comprises a first plate body and a second plate body fixedly connected, the length direction of the first plate body is perpendicular to the length direction of the workbench, and the length direction of the workbench is a horizontal direction; the second plate body is arranged obliquely, the length direction of the second plate body is parallel to the first direction, and the plug of the plugging unit is arranged towards the oil injection hole.

[0016] According to some preferred embodiments of the utility model, the second plugging mechanism comprises a first plugging assembly, a second plugging assembly, a third plugging assembly, a fourth plugging assembly and a fifth plugging assembly, the first plugging assembly is used for sealing the throttle inlet of the intake manifold, the second plugging assembly is used for sealing the EGR (Exhaust Gas Recirculation) port of the intake manifold, the third plugging assembly is used for sealing the carbon canister pipe joint of the intake manifold, the fourth plugging assembly is used for sealing the manifold pipe joint of the intake manifold, and the fifth plugging assembly is used for sealing the pressure sensor mounting hole of the intake manifold.

[0017] According to some preferred embodiments of the utility model, still include fixed connection's first fixed plate and second fixed plate, second fixed plate parallel to first fixed plate and be located below first fixed plate, first fixed seat, fourth plugging assembly and fifth plugging assembly all with second fixed plate's bottom surface fixed connection, third plugging mechanism includes a plurality of pressure rod, one end of pressure rod also with second fixed plate's bottom surface fixed connection, pressure rod is perpendicular to second fixed plate.

[0018] Compared with the prior art, the utility model has the advantages that: the air tightness detection device of the intake manifold, by simultaneously setting first plugging mechanism, second plugging mechanism and third plugging mechanism, can detect the diameter and position degree of the oil injection air hole on the intake manifold while carrying out air tightness detection on the intake manifold, and simulate the state that the oil injection air nozzle is installed on the intake manifold, can effectively improve the work efficiency and the qualified rate of product, wherein, if the plug cannot be inserted into the oil injection air hole, it indicates that the position degree of the oil injection air hole is unqualified, if the plug can be inserted into the oil injection air hole but the oil injection air hole still cannot be sealed, it indicates that the diameter of the oil injection air hole is unqualified, these will cause the air tightness detection of the intake manifold to fail, when the intake manifold can successfully complete the air tightness detection, it indicates that the position degree and diameter of the oil injection air hole are both qualified. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0020] Fig. 1 It is the three-dimensional structure schematic diagram of the air tightness detection device that the intake manifold is installed on in the preferred embodiment of the utility model,

[0021] Fig. 2 It is the three-dimensional structure schematic diagram of the first perspective of the air tightness detection device in the preferred embodiment of the utility model,

[0022] Fig. 3 It is the three-dimensional structure schematic diagram of the second perspective of the air tightness detection device in the preferred embodiment of the utility model,

[0023] Fig. 4 It is the three-dimensional structure schematic diagram of the first plugging mechanism in the preferred embodiment of the utility model,

[0024] Wherein: intake manifold-1, curve pipe joint-11, workbench-2, top plate-21, bottom plate-22, second support rod-23, first positioning assembly-24, second positioning assembly-25, first plugging mechanism-3, first part-311, second part-312, third part-313, connecting plate-314, plug-315, sealing ring-316, elastic element-317, gasket-318, bolt-319, connecting block-32, fixed block-33, first driver-34, first plate body-351, second plate body-352, connecting column-36, second fixed seat-411, second driver-412, first pressing block-413, third fixed seat-421, third driver-422, second pressing block-423, fourth fixed seat-431, fourth driver-432, third pressing block-433, fifth fixed seat-441, fifth driver-442, fourth pressing block-443, sixth fixed seat-451, sixth driver-452, fifth pressing block-453, pressing rod-5, first fixed plate-61, second fixed plate-62, first support rod-63, seventh fixed seat-71, seventh driver-72, punch-73. DETAILED DESCRIPTION

[0025] In order to make the technical personnel in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] Reference Figs. 1 to 4 The air tightness detection device of the intake manifold 1 in the embodiment includes a workbench 2, a positioning mechanism, a first plugging mechanism 3, a second plugging mechanism, a third plugging mechanism and a dotting mechanism. The positioning mechanism is fixedly arranged on the workbench 2. The intake manifold 1 is located on the top surface of the workbench 2 and is ensured to be accurately positioned by the positioning mechanism. The first plugging mechanism 3 and the third plugging mechanism are both located above the workbench 2. The first plugging mechanism 3 is used to seal the oil injection holes on the intake manifold 1 and detect whether the diameters and positions of the oil injection holes are qualified. The second plugging mechanism is used to seal the throttle inlet, the EGR port, the carbon can pipe joint, the curve pipe joint 11 and the pressure sensor mounting hole of the intake manifold 1. The third plugging mechanism is used to seal the screw holes of the intake manifold 1.

[0027] The air tightness detection device further comprises a first fixing plate 61, a second fixing plate 62, and a plurality of first supporting rods 63 located between the first fixing plate 61 and the second fixing plate 62, the first supporting rods 63 being used for fixedly connecting the first fixing plate 61 and the second fixing plate 62, and the second fixing plate 62 being parallel to the first fixing plate 61 and located below the first fixing plate 61. In addition, the third sealing mechanism comprises a plurality of pressing rods 5, one end of each of the pressing rods 5 being fixedly connected to the bottom surface of the second fixing plate 62 and the pressing rods 5 being perpendicular to the second fixing plate 62; the top of the first fixing plate 61 is provided with an air cylinder (not shown), the air cylinder being used for driving the first fixing plate 61 to move up and down along the vertical direction, thereby driving the pressing rods 5 on the second fixing plate 62 to seal into the threaded holes on the intake manifold 1.

[0028] Further, the workbench 2 comprises a top plate 21, a bottom plate 22, and a plurality of second supporting rods 23 located between the top plate 21 and the bottom plate 22, the second supporting rods 23 being used for fixedly connecting the top plate 21 and the bottom plate 22, and the top plate 21 being parallel to the bottom plate 22 and the area of the bottom plate 22 being greater than that of the top plate 21. In addition, the positioning mechanism comprises a first positioning assembly 24 and a second positioning assembly 25 fixedly arranged on the top surface of the top plate 21, in the embodiment, the first positioning assembly 24 comprises three positioning blocks, and the second positioning assembly 25 comprises three positioning tables; the intake manifold 1 is placed on the workbench 2, the top of the intake manifold 1 is placed on the positioning tables, and the three positioning blocks are respectively located on the three side edges of the bottom of the intake manifold 1; the first positioning assembly 24 and the second positioning assembly 25 are used for jointly fixing the intake manifold 1 on the top plate 21 of the workbench 2 and ensuring accurate positioning of the intake manifold 1, so that the intake manifold 1 will not be displaced.

[0029] Further, the first sealing mechanism 3 comprises a plurality of sealing units arranged at intervals, a connecting block 32, a fixing block 33, a first driver 34, and a first fixing seat; the plurality of sealing units are arranged at intervals on the connecting block 32 and are fixedly connected with the connecting block 32; the connecting block 32 is located below the fixing block 33, and one or more connecting columns 36 are arranged between the connecting block 32 and the fixing block 33, the connecting columns 36 being used for fixedly connecting the connecting block 32 and the fixing block 33. The first fixing seat comprises a first plate body 351 and a second plate body 352 fixedly connected, one end of the first plate body 351 away from the second plate body 352 being fixedly connected with the second fixing plate 62, one end of the telescopic shaft of the first driver 34 being fixedly connected with one side of the fixing block 33, and the shell of the first driver 34 being fixedly connected with one side of the second plate body 352; the first driver 34 is used for driving the fixing block 33 to move back and forth along the first direction, thereby driving the plurality of sealing units to move back and forth along the first direction to approach and / or move away from the oil injection holes on the intake manifold 1. The length direction of the first plate body 351 is perpendicular to the length direction of the workbench 2, and the length direction of the workbench 2 is a horizontal direction; the second plate body 352 is arranged obliquely, and the length direction of the second plate body 352 is parallel to the first direction, so as to ensure that the length extension direction of the sealing units is parallel to the length direction of the oil injection holes.

[0030] Specifically, the number of plugging units is equal to the number of oil injection holes, each plugging unit includes a positioning column, a connecting plate 314, a plug 315, a sealing ring 316 and an elastic member 317, the plug 315 is inserted into the oil injection hole and cooperates with the sealing ring 316 to seal the oil injection hole. One side of the connecting plate 314 is fixedly connected with one side of the connecting block 32, and a positioning hole penetrating through the thickness direction of the connecting plate 314 is formed on the connecting plate 314. The positioning column includes a first part 311, a second part 312 and a third part 313, the two ends of the second part 312 are fixedly connected with the first part 311 and the third part 313 respectively, one end of the third part 313 away from the second part 312 is fixedly connected with one end of the plug 315, the first part 311 penetrates through the positioning hole and the diameter of the positioning hole is greater than the outer diameter of the first part 311, the outer diameter of the second part 312 is greater than the outer diameters of the first part 311 and the third part 313, the outer diameter of the third part 313 is greater than the outer diameter of the plug 315, the sealing ring 316 is sleeved on the outer periphery of the plug 315, one side of the sealing ring 316 is in contact with one end of the third part 313, and the inner diameter of the sealing ring 316 is smaller than the outer diameter of the third part 313. The plug 315 is arranged towards the oil injection hole, and the plug 315 is arranged in one-to-one correspondence with the oil injection hole, and the axis of the plug 315 coincides with the axis of the oil injection hole. In the embodiment, the first part 311 of the positioning column and the positioning hole are in clearance fit, and the size of the clearance between the two is related to the position degree of the oil injection hole. When the position degree of the oil injection hole is unqualified, the plug 315 cannot be inserted into the oil injection hole; when the position of the oil injection hole has a deviation, as long as it is within the position degree range, the plug 315 can be inserted into the oil injection hole and cooperate with the sealing ring 316 to plug the oil injection hole to complete the air tightness detection; if the diameter of the oil injection hole is unqualified, the sealing ring 316 cannot plug the air hole, so the air tightness detection cannot be performed. Therefore, only when the diameter and the position degree of the oil injection hole are both qualified, the air tightness detection of the intake manifold 1 will pass, which can not only complete the air tightness detection of the intake manifold 1, but also detect the diameter and the position degree of the oil injection hole.

[0031] In order to ensure that the positioning column can be fixed on the connecting plate 314 without falling off, an external thread is arranged on the outer wall of the first part 311, and a gasket 318 and a bolt 319 are sleeved on one end of the first part 311 away from the second part 312, the gasket 318 is located between one side of the connecting plate 314 and the bolt 319, and the outer diameter of the gasket 318 is greater than the diameter of the positioning hole, the inner wall of the bolt 319 is threadedly connected with the outer wall of the first part 311 to tighten the bolt 319 on the outer wall of the first part 311 of the positioning column, and at the same time the bolt 319 tightly abuts against the gasket 318 to fasten the positioning column on the connecting plate 314, avoiding that the connecting column 36 falls off due to the reaction force when the plug 315 is inserted into the oil injection hole.

[0032] The elastic member 317 is sleeved on the outer periphery of the first part 311, the inner diameter of the elastic member 317 is smaller than the outer diameter of the second part 312, the outer diameter of the elastic member 317 is greater than the diameter of the positioning hole, so that one end of the elastic member 317 abuts against one end of the second part 312, and the other end of the elastic member 317 abuts against the side of the connecting plate 314 close to the plug 315. The elastic member 317 in the embodiment is preferably a spring, when the plug 315 is inserted into the oil and gas injection hole under the driving action of the first driver 34, the elastic member 317 can play a good buffering role to prevent the plug 315 from bruising the product; at the same time, the elastic member 317 can also tighten the plug 315, avoiding the shaking of the plug 315 due to the gap between the positioning column and the positioning hole.

[0033] Further, the second blocking mechanism comprises a first blocking assembly, a second blocking assembly, a third blocking assembly, a fourth blocking assembly and a fifth blocking assembly. The first blocking assembly is used for sealing the throttle valve inlet of the intake manifold 1, and comprises a second fixed seat 411, a second driver 412 and a first pressing block 413. The bottom of the second fixed seat 411 is fixedly connected with the bottom plate 22 of the workbench 2, the shell of the second driver 412 is fixedly connected with the top of the second fixed seat 411, and the first pressing block 413 is fixedly connected with one end of the telescopic shaft of the second driver 412. The first pressing block 413 is driven by the second driver 412 to approach and / or move away from the throttle valve inlet. The second blocking assembly is used for sealing the EGR port of the intake manifold 1, and comprises a third fixed seat 421, a third driver 422 and a second pressing block 423. The bottom of the third fixed seat 421 is fixedly connected with the bottom plate 22 of the workbench 2, the shell of the third driver 422 is fixedly connected with the third fixed seat 421, and the second pressing block 423 is fixedly connected with one end of the telescopic shaft of the third driver 422. The shell and the telescopic shaft of the third driver 422 penetrate the thickness direction of the top plate 21 of the workbench 2, and the second pressing block 423 is driven by the third driver 422 to approach and / or move away from the EGR port. The third blocking assembly is used for sealing the carbon canister pipe joint of the intake manifold 1, and comprises a fourth fixed seat 431, a fourth driver 432 and a third pressing block 433. The bottom of the fourth fixed seat 431 is fixedly connected with the top plate 21 of the workbench 2, the shell of the fourth driver 432 is fixedly connected with the top of the fourth fixed seat 431, and the third pressing block 433 is fixedly connected with one end of the telescopic shaft of the fourth driver 432. The third pressing block 433 is driven by the fourth driver 432 to approach and / or move away from the carbon canister pipe joint. The fourth blocking assembly is used for sealing the curve-through pipe joint 11 of the intake manifold 1, and comprises a fifth fixed seat 441, a fifth driver 442 and a fourth pressing block 443. One side of the fifth fixed seat 441 is fixedly connected with the bottom surface of the second fixed plate 62, the shell of the fifth driver 442 is fixedly connected with the other side of the fifth fixed seat 441, and the fourth pressing block 443 is fixedly connected with one end of the telescopic shaft of the fifth driver 442. The fourth pressing block 443 is driven by the fifth driver 442 to approach and / or move away from the curve-through pipe joint 11. The fifth blocking assembly is close to the fourth blocking assembly, and is used for sealing the pressure sensor mounting hole of the intake manifold 1. The fifth blocking assembly comprises a sixth fixed seat 451, a sixth driver 452 and a fifth pressing block 453. One side of the sixth fixed seat 451 is fixedly connected with the bottom surface of the second fixed plate 62, the shell of the sixth driver 452 is fixedly connected with the sixth fixed seat 451, and the fifth pressing block 453 is fixedly connected with one end of the telescopic shaft of the sixth driver 452. The fifth pressing block 453 is driven by the sixth driver 452 to approach and / or move away from the pressure sensor mounting hole.

[0034] Further, the dotting mechanism is located on one side of the second blocking assembly, and the dotting mechanism comprises a seventh fixed seat 71, a seventh driver 72 and a punch 73, wherein the seventh fixed seat 71 is fixedly connected with the top plate 21 of the workbench 2, the shell of the seventh driver 72 is fixedly connected with one side of the seventh fixed seat 71, the telescopic shaft of the seventh driver 72 is fixedly connected with one end of the punch 73 after penetrating through the thickness direction of the seventh fixed seat 71, the seventh driver 72 is used for driving the punch 73 to approach and / or move away from the outer wall of the intake manifold 1, and the tip of the punch 73 is used for marking on the intake manifold 1.

[0035] The working principle of the air tightness detection device in the embodiment is briefly described as follows:

[0036] The second blocking mechanism is used for sealing the corresponding position on the intake manifold 1 under the action of the corresponding driver, the third blocking mechanism is used for sealing the screw hole of the intake manifold 1 under the action of the pressure rod 5 of the cylinder, then the first driver 34 drives the blocking unit to move downward, so that the plug 315 gradually approaches the oil injection hole on the intake manifold 1, when the position degree of the oil injection hole is unqualified, the plug 315 cannot enter the oil injection hole, and it can be directly judged that the position degree of the oil injection hole is unqualified; when the position degree of the oil injection hole is qualified, the plug 315 can be inserted into the oil injection hole, if the diameter of the oil injection hole is unqualified, the sealing ring 316 cannot block the oil injection hole, so that the air tightness detection cannot be performed, and it can be directly judged that the position degree of the oil injection hole is qualified but the diameter is unqualified; when the air tightness detection of the intake manifold 1 is passed, it indicates that the diameter and the position degree of the oil injection hole are both qualified.

[0037] The above embodiment is only for describing the technical concept and characteristics of the utility model, and the purpose is to enable persons skilled in the art to understand the content of the utility model and implement it, and it cannot limit the protection scope of the utility model, and equivalent changes or modifications according to the spirit and essence of the utility model should be covered in the protection scope of the utility model.

Claims

1. A gas leakage detection device for an intake manifold having a plurality of screw holes and fuel injection holes, characterized by, The air tightness detection device comprises a workbench, a first plugging mechanism, a second plugging mechanism and a third plugging mechanism, the intake manifold is located on the top surface of the workbench, the first plugging mechanism and the third plugging mechanism are both located above the workbench, the first plugging mechanism comprises a plurality of plugging units arranged at intervals, each plugging unit comprises a positioning column, a connecting plate, a plug and a sealing ring, the connecting plate is provided with a positioning hole penetrating through the thickness direction of the connecting plate, the positioning hole is used for allowing the positioning column to pass through, and the diameter of the positioning hole is greater than the outer diameter of the positioning column; the plug is fixedly connected with one end of the positioning column, the sealing ring is sleeved on the outer periphery of the plug, and the plug and the sealing ring are used for sealing the oil injection hole together; the third plugging mechanism is used for sealing the screw hole of the intake manifold.

2. The air tightness testing apparatus of claim 1, wherein, The positioning column comprises a first part, a second part and a third part, the two ends of the second part are fixedly connected with the first part and the third part respectively, and one end of the third part away from the second part is fixedly connected with one end of the plug.

3. The air tightness testing apparatus of claim 2, wherein, The first part penetrates through the positioning hole, the diameter of the positioning hole is greater than the outer diameter of the first part, the outer diameter of the second part is greater than the outer diameters of the first part and the third part, the outer diameter of the third part is greater than the outer diameter of the plug, one end of the third part is in contact with one end of the sealing ring, and the inner diameter of the sealing ring is smaller than the outer diameter of the third part.

4. The air tightness testing apparatus of claim 3, wherein, Each plugging unit further comprises an elastic member, the elastic member is sleeved on the outer periphery of the first part, one end of the elastic member is in abutment with one end of the second part, the other end of the elastic member is in abutment with the side of the connecting plate close to the plug, the inner diameter of the elastic member is smaller than the outer diameter of the second part, and the outer diameter of the elastic member is greater than the diameter of the positioning hole.

5. The air tightness testing apparatus of claim 3, wherein, The outer wall of the first part is provided with external threads, a gasket and a bolt are sleeved on one end of the first part away from the second part, the gasket is located between one side of the connecting plate and the bolt, the outer diameter of the gasket is greater than the diameter of the positioning hole, and the inner wall of the bolt is threadedly connected with the outer wall of the first part.

6. The air tightness testing apparatus of claim 1, wherein, The number of the plugging units is equal to the number of the oil injection holes, the plug is arranged in one-to-one correspondence with the oil injection hole, and the axis of the plug coincides with the axis of the oil injection hole.

7. The air tightness testing apparatus of claim 1, wherein, The first plugging mechanism further comprises a connecting block, a fixed block, a first driver and a first fixed seat, a plurality of plugging units are arranged at intervals on the connecting block, and one side of the connecting plate in each plugging unit is fixedly connected with one side of the connecting block; the connecting block is located below the fixed block, one or more connecting columns are arranged between the connecting block and the fixed block, the connecting columns are used for fixedly connecting the connecting block and the fixed block, one end of the telescopic shaft of the first driver is fixedly connected with one side of the fixed block, the shell of the first driver is fixedly connected with one side of the first fixed seat, and the first driver is used for driving the fixed block to move back and forth in the first direction.

8. The air tightness detection apparatus according to claim 7, characterized in that, The first fixed seat comprises a first plate body and a second plate body fixedly connected, the length direction of the first plate body is perpendicular to the length direction of the workbench, and the length direction of the workbench is a horizontal direction; the second plate body is arranged obliquely, the length direction of the second plate body is parallel to the first direction, and the plug of the plugging unit is arranged towards the oil and gas injection hole.

9. The air tightness testing apparatus of claim 7, wherein, The second plugging mechanism comprises a first plugging assembly, a second plugging assembly, a third plugging assembly, a fourth plugging assembly and a fifth plugging assembly, the first plugging assembly is used for sealing the throttle inlet of the intake manifold, the second plugging assembly is used for sealing the EGR port of the intake manifold, the third plugging assembly is used for sealing the carbon canister pipe joint of the intake manifold, the fourth plugging assembly is used for sealing the curve pipe joint of the intake manifold, and the fifth plugging assembly is used for sealing the pressure sensor mounting hole of the intake manifold.

10. The air tightness detection apparatus according to claim 9, wherein Further comprising a first fixed plate and a second fixed plate fixedly connected, the second fixed plate is parallel to the first fixed plate and located below the first fixed plate, the first fixed seat, the fourth plugging assembly and the fifth plugging assembly are all fixedly connected with the bottom surface of the second fixed plate; the third plugging mechanism comprises a plurality of pressing rods, one end of the pressing rod is also fixedly connected with the bottom surface of the second fixed plate, and the pressing rod is perpendicular to the second fixed plate.

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