CN107621336A - Test device for air tightness - Google Patents
Test device for air tightness Download PDFInfo
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- CN107621336A CN107621336A CN201711002732.4A CN201711002732A CN107621336A CN 107621336 A CN107621336 A CN 107621336A CN 201711002732 A CN201711002732 A CN 201711002732A CN 107621336 A CN107621336 A CN 107621336A
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- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 230000007246 mechanism Effects 0.000 claims abstract description 61
- 230000008676 import Effects 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 230000000903 blocking effect Effects 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000009781 safety test method Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 description 58
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004886 head movement Effects 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Examining Or Testing Airtightness (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of test device for air tightness, the air-tightness of the cooling loop for detecting product, test device for air tightness includes frame, and the mounting table for placing product to be measured is provided with frame；Clamp moving mechanism, outlet press seal mechanism and import plugging mechanism are connected with frame.Wherein, clamp moving mechanism is arranged at the top of mounting table, and for clamping mobile product to be measured to mounting table and clamping the product removed on mounting table；Export the outlet that press seal mechanism is used for press seal product；Import plugging mechanism includes block head and the first drive mechanism, and block head is used for the import for blocking product, and offers the instrument connection for connecting import；First drive mechanism is used to drive block head to block or open import.The test device for air tightness, which can be realized, quickly to be tested the air-tightness of the cooling loop of product, and testing efficiency is high.
Description
Technical field
The present invention relates to air tightness test technical field, more particularly to a kind of it is used to test the airtight of inverter cooling loop
System safety testing device.
Background technology
In the structure of inverter, it is typically provided with for the water cooling to be radiated to its internal part or the cooling of air cooling
Loop, to ensure the durability of inverter.Before product export, it is necessary to air tightness test is carried out to the cooling loop of inverter, with
Judge whether product meets requirement.
In the prior art, the air tightness test typically making to inverter has a test platform, and test platform is equipped with frock,
Frock is turned on air-tightness tester by tracheae.After inverter to be measured is bolted and is sealed in frock, frock it is close
Envelope chamber starts air inlet, reaches setting pressure, and after keeping setting time, read pressure drop-out value whether permission scope it
It is interior to judge whether the air-tightness of product is qualified.
But fixed due to the sealing of test product and frock and use manually installed fixing bolt, and with tested production
Product are become large-sized, it is necessary to which the bolt used in frock then increases therewith, and dismounting is inconvenient, and testing efficiency is than relatively low, no
Adapt to the air tightness test demand of enterprise's high-volume inverter.
The content of the invention
It is an object of the invention to propose a kind of test device for air tightness, can realize to the airtight of the cooling loop of product
Property quickly tested, testing efficiency is high.
To use following technical scheme up to this purpose, the present invention：
A kind of test device for air tightness, the air-tightness of the cooling loop for detecting product, the test device for air tightness
Including：
Frame, the mounting table for placing product to be measured is provided with the frame；
Clamp moving mechanism, the top of the mounting table is arranged at, it is described for being moved to product to be measured in test
On mounting table, and the product on the mounting table is removed after terminating to test；
Press seal mechanism is exported, is arranged on side corresponding with the outlet of the product on the mounting table, and being capable of press seal
The outlet；
Import plugging mechanism, is arranged on side corresponding with the import of the product on the mounting table, and including：
Block head, for blocking the import, and offer the instrument connection for connecting the import；
First drive mechanism, it is connected with the block head, and can be used in driving described in the block head closure or opening
Import.
Further, first drive mechanism includes：
For fixing the fixed plate of the block head；
One end passes through the connecting rod of first driving plate and the T-shaped being connected with the fixed plate；
The first spring being set in the connecting rod between first driving plate and the fixed plate；
First cylinder, its movable end are connected with the first driving plate, and its fixing end is connected with the frame.
Further, the test device for air tightness also includes being used to drive the block head and first driving machine
The X-axis driving device that structure moves along X-direction jointly；The X-axis driving device is Pneumatic slid platform cylinder, the Pneumatic slid platform gas
The slide unit of cylinder is connected with first cylinder, and the fixing end of the Pneumatic slid platform cylinder is connected with the frame.
Further, the outlet press seal mechanism includes：
Press seal head for the outlet of press seal product；
Second driving plate, connected between second driving plate and the press seal head by second spring；
Second cylinder, the movable end of second cylinder are connected with second driving plate, its fixing end and the frame
Connection.
Further, the clamp moving mechanism includes：
A pair of clamping jaws for product clamping；
Clamping jaw cylinder, the clamping jaw cylinder are connected with a pair of clamping jaws, and can drive a pair of clamping jaw foldings；
Z axis drive device, the Z axis drive device are connected with the clamping jaw cylinder, and can drive the clamping jaw cylinder
And a pair of clamping jaws move along Z-direction jointly；
Y-axis drive mechanism, the Y-axis drive mechanism are connected with the Z axis drive device, and the Z axis can be driven to drive
Dynamic device, the clamping jaw cylinder and a pair of clamping jaws move along Y direction jointly.
Further, the Z axis drive device is the Z axis cylinder that movable end is connected with the clamping jaw cylinder.
Further, the Y-axis drive mechanism includes：
The Y-axis driving plate being connected with the Z axis cylinder, the Y-axis driving plate are connected with the housing slide；
The Y-axis driving device being connected in the frame, the Y-axis driving device is connected with the Y-axis driving plate, and energy
The Y-axis driving plate is enough driven to be moved along Y direction.
Further, Y direction is provided with two slide rails, the bottom surface connection of the Y-axis driving plate in the frame
Have respectively that two sliding blocks corresponding with two slide rails, the sliding block are slidably connected with the corresponding slide rail.
Further, the test device for air tightness also includes：
It is arranged at the side of the mounting table and is used for the conveying device of conveying products, use is connected with the conveying device
In the carrier of carrying product, the top surface of the carrier is provided with the blocked block for clamping product；
Lifting body, the lifting body are arranged at the lower section of the conveying device, and for will be moved to the placement
The product on the carrier at platform jacks up upwards, to depart from the clamping of the blocked block.
Further, the lifting body includes：
Bearing；
Raising plate, the raising plate is arranged at the top of the bearing, and top surface is provided with multiple jacking blocks and is used for
Guide multiple first guide pillars that each jacking block jacks up the product on the carrier；
For the jacking cylinder for driving the raising plate to move up and down, the movable end of the jacking cylinder and the raising plate
Connection, the fixing end of the jacking cylinder are connected with the bearing；
Two the second guide pillars, two second guide pillars are connected with the bearing, moved up and down with guiding the raising plate.
Beneficial effects of the present invention are：The automatic loading/unloading of product to be measured is realized using clamp moving mechanism, using outlet
Press seal mechanism realizes the press seal or opening of the import to product, and real by the way of the driving block head movement of the first drive mechanism
The now closure of the outlet to product or opening, substantially reduce test period, improve the testing efficiency of product.
Brief description of the drawings
Fig. 1 is the structural representation of test device for air tightness provided by the invention；
Fig. 2 is the structural representation of the import plugging mechanism in Fig. 1；
Fig. 3 is the enlarged diagram at I in Fig. 1；
Fig. 4 is the structural representation of the clamp moving mechanism in Fig. 1；
Fig. 5 is the structural representation of the lifting body in Fig. 1.
In figure：10- products；11- imports；12- is exported；20- frames；21- mounting tables；22- slide rails；23- supports；41- is pressed from both sides
Pawl；42- clamping jaw cylinders；43-Z axial brake devices；44-Y axle drive mechanisms；441-Y axle driving plates；442-Y axial brake devices；
50- import plugging mechanisms；51- block heads；511- instrument connections；The drive mechanisms of 52- first；521- fixed plates；522- first drives
Plate；523- connecting rods；The springs of 524- first；The cylinders of 525- first；53-X axial brake devices；60- lifting bodies；61- bearings；
62- raising plates；621- jacking blocks；The guide pillars of 622- first；63- jacking cylinders；The guide pillars of 64- second；70- outlets press seal mechanism；71- is pressed
End socket；The driving plates of 72- second；73- second springs；The cylinders of 74- second；80- conveying devices.
Embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by embodiment.
As shown in figure 1, a kind of test device for air tightness, the air-tightness of the cooling loop for detecting product 10, air-tightness
Test device includes frame 20, and the mounting table 21 for placing product 10 to be measured is provided with frame 20；It is connected with frame 20
Clamp moving mechanism, outlet press seal mechanism 70 and import plugging mechanism 50.Wherein, clamp moving mechanism is arranged at mounting table 21
Top, and for clamping mobile product 10 to be measured to mounting table 21 and clamping the product 10 removed on mounting table 21.Import is sealed
The import 11 that stifled mechanism 50 corresponds to the product 10 being placed on mounting table 21 is set, and can block or open import 11；Outlet
The outlet 12 that press seal mechanism 70 corresponds to the product 10 being placed on mounting table 21 is set, being capable of press seal or opening outlet 12.
As shown in Fig. 2 the block head 51 and first that import plugging mechanism 50 includes being used to block the import 11 of product 10 drives
Motivation structure 52, wherein, the concentrically axis setting, and offer survey of import 11 of block head 51 and the product 10 on mounting table 21
Prospect hole 511, one end of the instrument connection 511 are connected with import 11, and the other end is turned on by conduit with air-tightness tester.
Further, the first drive mechanism 52 includes fixed plate 521, the first driving plate 522, the connecting rod of T-shaped 523, the
One spring 524 and the first cylinder 525, wherein, fixed plate 521 is used to fix block head 51；First driving plate 522 and fixed plate
521 is parallel；One end of connecting rod 523 is fixedly connected through the first driving plate 522 and with fixed plate 521；First spring 524 is arranged
In the connecting rod 523 between the first driving plate 522 and fixed plate 521；The movable end of first cylinder 525 and the first driving
Plate 522 is connected, and the fixing end of the first cylinder 525 is connected with frame 20.When blocking import 11, the first cylinder 525 driving first
Driving plate 522 moves towards import 11, drives block head 51 to move to block import 11, and utilize the bullet of the first spring 524
Property effect, import 11 is remained the state blocked by block head 51 in whole test process, with ensure block head 51 with
The sealed connection of import 11, avoid influenceing test result because of block head 51 and the connectivity problem of import 11.
As shown in figure 3, outlet press seal mechanism 70 includes being used for first 71, second driving plate 72 of press seal of press seal outlet 12, used
The cylinder 74 of second spring 73 and second between connection press seal first 71 and the second driving plate 72, wherein, press seal first 71 and outlet
12 concentrically axis settings, and the external diameter of press seal first 71 is more than the external diameter of outlet 12；The movable end and second of second cylinder 74
Driving plate 72 is connected, and the fixing end of the second cylinder 74 is connected with frame 20.At closure outlet 12, the second cylinder 74 driving second
Driving plate 72 lives first 71 press seal of press seal and exports 12, and using the elastic reaction of second spring 73, make towards the movement of outlet 12
Outlet 12 is in by the state of first 71 press seal of press seal all the time in whole test process, with ensure press seal first 71 with export 12 it is close
Envelope connection, avoid because press seal first 71 influences test result with the connectivity problem of outlet 12.
To adapt to the test to different products 10, the X-axis for adjusting block head 51 along X-direction can be set up and drive dress
Put 53.As a preferred embodiment of the present invention, X-axis driving device 53 is Pneumatic slid platform cylinder, wherein, Pneumatic slid platform cylinder
Slide unit be connected with the first cylinder 525, the fixing end of Pneumatic slid platform cylinder is connected by support 23 with frame 20.In this way, can be real
The now closure of the import 11 to different product 10.Similarly, can set up for adjusting the second pneumatic of press seal first 71 along X-direction
Slider cylinder, the slide unit of the second Pneumatic slid platform cylinder are connected with the second cylinder 74, and fixing end is fixed on support 23, with realization pair
The press seal of the outlet 12 of different product 10.
As shown in figure 4, clamp moving mechanism includes driving for a pair of the clamping jaws 41, clamping jaw cylinder 42, Z axis of product clamping 10
Dynamic device 43 and Y-axis drive mechanism 44.Wherein, clamping jaw cylinder 42 is connected with a pair of clamping jaws 41, and for driving a pair of clamping jaws 41
Folding；Z axis drive device 43 is connected with clamping jaw cylinder 42, and for driving clamping jaw cylinder 42 and a pair of clamping jaws 41 jointly along Z axis
Move in direction；Y-axis drive mechanism 44 is connected with Z axis drive device 43, and for driving Z axis drive device 43, clamping jaw cylinder 42
And a pair of clamping jaws 41 move along Y direction jointly.Pass through Z axis drive device 43, Y-axis drive mechanism 44, clamping jaw cylinder 42 and one
To that under the common cooperation of clamping jaw 41, can realize the automatic loading/unloading of product 10, operating efficiency is high, and position is accurate.
As a preferred embodiment of the present invention, Z axis drive device 43 is the Z axis that movable end is connected with clamping jaw cylinder 42
Cylinder.Y-axis drive mechanism 44 includes：The Y-axis driving plate 441 being connected with Z axis cylinder and the Y-axis driving being connected in frame 20
Device 442, Y-axis driving plate 441 are slidably connected with frame 20；Y-axis driving device 442 is connected with Y-axis driving plate 441, and is used for
Driving Y-axis driving plate 441 moves along Y direction.Wherein, Y-axis driving device 442 can be that movable end connects with Y-axis driving plate 441
The Y-axis cylinder or the screw mechanism of routine connect, need to only realize and promote Y-axis driving plate 441 and be connected to Y-axis driving plate
Z axis cylinder on 441 etc. moves along Y direction jointly.
Further, the bottom surface of Y-axis driving plate 441 is connected with two sliding blocks, and Y direction is provided with difference in frame 20
Two slide rails 22 connect with two sliding block phase rails, to realize the steady movement of Y-axis driving plate 441.
Further to adapt to the demand of the production automation, the test device for air tightness can be also had additional for conveying products 10
Conveying device 80 and lifting body 60.
Wherein, conveying device 80 can use common sprocket-type conveyer or belt type conveyer, and it is arranged at mounting table
21 side, and the carrier for carrying product 10 is connected with, the top surface of carrier is provided with the clamping for clamping product 10
Block, to prevent that product 10 is moved during transport, and then influence clamp moving mechanism gripping product 10.
Lifting body 60 is arranged at the lower section of conveying device 80, and the production for will be moved on the carrier at mounting table 21
Product 10 jack up upwards, to depart from the clamping of blocked block.Specifically, as shown in figure 5, lifting body 60 includes bearing 61, raising plate
62nd, for driving jacking cylinder 63 that raising plate 62 moves up and down and being connected and with bearing 60 for guiding raising plate about 62
Two mobile the second guide pillars 64.Wherein, bearing 61 plays support raising plate 62, jacking cylinder 63 and two the second guide pillars 64
Effect, is attached in frame 20, also can independently place.The movable end of jacking cylinder 63 is connected with raising plate 62, jacking cylinder
63 fixing end is connected with bearing 61.And raising plate 62 is arranged at the top of bearing 61, and top surface is provided with multiple jacking blocks 621
And multiple first guide pillars 622, product 10 can be jacked up to the clamping for departing from blocked block by multiple jacking blocks 621, jacking up product 10
During, guided using the first guide pillar 622, to ensure smoothly to eject the product 10 on carrier, and then be easy to clamp
Travel mechanism grips mobile product 10 to mounting table 21.
The test device for air tightness is real by the cooperation between conveying device 80, lifting body 60 and clamp moving mechanism
The automatic loading/unloading of product 10 to be measured is showed, and product 10 is blocked by import plugging mechanism 50 and outlet press seal mechanism 70 respectively
Import 11 and outlet 12, the quick connection of air-tightness tester and product 10 to be measured is realized, so as to substantially reduce product
10 test period, improve the testing efficiency of product 10.Its course of work approximately as：
S1：Product 10 to station to be detected, jacking cylinder 63 in the transport carriage of conveying device 80 jacks up raising plate 62, band
Move each jacking block 621 to jack up the product 10 on carrier, to depart from the fast clamping of clamping.
S2：The product 10 that clamp moving mechanism gripping lifting body 60 jacks up, and be moved on mounting table 21.By product 10
After being moved to mounting table 21, the state for keeping a pair of clamping jaws 41 to be in product clamping 10 can be continued, to avoid product 10 from testing
During be moved.
S3：First drive mechanism 52 driving block head 51 blocks import 11；Second cylinder 74 driving first 71 press seal of press seal goes out
Mouth 12；Air-tightness tester is started working.
After test completion, clamp moving mechanism grips the product 10 on mounting table 21 and is moved on carrier, by defeated
Device 80 is sent to be delivered to next station.
The technical principle of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's
Principle, and limiting the scope of the invention can not be construed in any way.Based on explanation herein, the technology of this area
Personnel would not require any inventive effort the other embodiments that can associate the present invention, and these modes are fallen within
Within protection scope of the present invention.
Claims (10)
1. a kind of test device for air tightness, the air-tightness of the cooling loop for detecting product (10), it is characterised in that the gas
Close system safety testing device includes：
Frame (20), the mounting table (21) for placing product to be measured (10) is provided with the frame (20)；
Clamp moving mechanism, the top of the mounting table (21) is arranged at, for product to be measured (10) being moved in test
On the mounting table (21), and the product (10) on the mounting table (21) is removed after terminating to test；
Press seal mechanism (70) is exported, is arranged on side corresponding with the outlet (11) of the product (10) on the mounting table (21),
And (12) can be exported described in press seal；
Import plugging mechanism (50), side corresponding with the import (11) of the product (10) on the mounting table (21) is arranged on,
And including：
Block head (51), for blocking the import (11), and offer the instrument connection for connecting the import (11)
(511)；
First drive mechanism (52), it is connected with the block head (51), and the block head (51) can be driven to block or open
The import (11).
2. test device for air tightness according to claim 1, it is characterised in that first drive mechanism (52) includes：
For fixing the fixed plate (521) of the block head (51)；
First driving plate (522) parallel with the fixed plate (521)；
One end passes through the connecting rod (523) of first driving plate (522) and the T-shaped being connected with the fixed plate (521)；
Be set in the connecting rod (523) between first driving plate (522) and the fixed plate (521)
One spring (524)；
First cylinder (525), its movable end are connected with the first driving plate (522), and its fixing end connects with the frame (20)
Connect.
3. test device for air tightness according to claim 2, it is characterised in that the test device for air tightness also includes using
In the X-axis driving device (53) that the driving block head (51) and first drive mechanism (52) are moved along X-direction jointly；
The X-axis driving device (53) is Pneumatic slid platform cylinder, and the slide unit of the Pneumatic slid platform cylinder connects with first cylinder (525)
Connect, the fixing end of the Pneumatic slid platform cylinder is connected with the frame (20).
4. test device for air tightness according to claim 1, it is characterised in that the outlet press seal mechanism (70) includes：
Press seal head (71) for the outlet of press seal product (10)；
Second driving plate (72), between second driving plate (72) and the press seal head (71) by second spring (73) even
Connect；
Second cylinder (74), the movable end of second cylinder (74) are connected with second driving plate (72), its fixing end with
Frame (20) connection.
5. test device for air tightness according to claim 1, it is characterised in that the clamp moving mechanism includes：
A pair of clamping jaws (41) for product clamping (10)；
Clamping jaw cylinder (42), the clamping jaw cylinder (42) is connected with a pair of clamping jaws (41), and can drive a pair of folders
Pawl (41) folding；
Z axis drive device (43), the Z axis drive device (43) are connected with the clamping jaw cylinder (42), and can drive described
Clamping jaw cylinder (42) and a pair of clamping jaws (41) are moved along Z-direction jointly；
Y-axis drive mechanism (44), the Y-axis drive mechanism (44) is connected with the Z axis drive device (43), and can drive institute
Z axis drive device (43), the clamping jaw cylinder (42) and a pair of clamping jaws (41) are stated to move along Y direction jointly.
6. test device for air tightness according to claim 5, it is characterised in that the Z axis drive device (43) is activity
Hold the Z axis cylinder being connected with the clamping jaw cylinder (42).
7. test device for air tightness according to claim 6, it is characterised in that the Y-axis drive mechanism (44) includes：
The Y-axis driving plate (441) being connected with the Z axis cylinder, the Y-axis driving plate (441) is slided with the frame (20) to be connected
Connect；
The Y-axis driving device (442) being connected in the frame (20), the Y-axis driving device (442) drive with the Y-axis
Plate (441) is connected, and the Y-axis driving plate (441) can be driven to be moved along Y direction.
8. test device for air tightness according to claim 7, it is characterised in that set on the frame (20) along Y direction
Be equipped with two slide rails (22), the bottom surface of the Y-axis driving plate (441) be connected with respectively with two slide rails (22) corresponding two
Individual sliding block, the sliding block are slidably connected with the corresponding slide rail (22).
9. test device for air tightness according to claim 1, it is characterised in that the test device for air tightness also includes：
It is arranged at the side of the mounting table (21) and for the conveying device (80) of conveying products (10), the conveying device
(80) carrier for carrying product (10) is connected with, the top surface of the carrier is provided with the clamping for clamping product (10)
Block；
Lifting body (60), the lifting body (60) are arranged at the lower section of the conveying device (80), and for will be moved to
Product (10) on the carrier at mounting table (21) place jacks up upwards, to depart from the clamping of the blocked block.
10. test device for air tightness according to claim 9, it is characterised in that the lifting body (60) includes：
Bearing (61)；
Raising plate (62), the raising plate (62) is arranged at the top of the bearing (61), and top surface is provided with multiple jacking blocks
(621) multiple first guide pillars (622) of the product (10) on the carrier and for guiding each jacking block (621) are jacked up；
For the jacking cylinder (63) for driving the raising plate (62) to move up and down, the movable end of the jacking cylinder (63) and institute
Raising plate (62) connection is stated, the fixing end of the jacking cylinder (63) is connected with the bearing (60)；
Two the second guide pillars (64), two second guide pillars (64) are connected with the bearing (60), to guide the raising plate
(62) move up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711002732.4A CN107621336B (en) | 2017-10-24 | 2017-10-24 | Air tightness testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711002732.4A CN107621336B (en) | 2017-10-24 | 2017-10-24 | Air tightness testing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107621336A true CN107621336A (en) | 2018-01-23 |
| CN107621336B CN107621336B (en) | 2024-05-31 |
Family
ID=61092665
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711002732.4A Active CN107621336B (en) | 2017-10-24 | 2017-10-24 | Air tightness testing device |
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| Country | Link |
|---|---|
| CN (1) | CN107621336B (en) |
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| CN108581452A (en) * | 2018-06-09 | 2018-09-28 | 苏州科技大学 | A kind of turbocharger the turn of the screw and sealing test equipment |
| CN113958794A (en) * | 2020-10-30 | 2022-01-21 | 昕迪精密机械（东莞）有限公司 | Pipe gas blockage removes subassembly |
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| CN108581452A (en) * | 2018-06-09 | 2018-09-28 | 苏州科技大学 | A kind of turbocharger the turn of the screw and sealing test equipment |
| CN108581452B (en) * | 2018-06-09 | 2023-12-01 | 苏州科技大学 | Screw and seal test equipment are twisted to turbo charger |
| CN113958794A (en) * | 2020-10-30 | 2022-01-21 | 昕迪精密机械（东莞）有限公司 | Pipe gas blockage removes subassembly |
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| CN107621336B (en) | 2024-05-31 |
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