CN106706233B - Hole-by-hole air tightness inspection tool for multiple blind holes in part - Google Patents
Hole-by-hole air tightness inspection tool for multiple blind holes in part Download PDFInfo
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- CN106706233B CN106706233B CN201611211927.5A CN201611211927A CN106706233B CN 106706233 B CN106706233 B CN 106706233B CN 201611211927 A CN201611211927 A CN 201611211927A CN 106706233 B CN106706233 B CN 106706233B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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Abstract
The invention discloses a hole-by-hole air tightness inspection tool for a plurality of blind holes in a part, wherein a first sealing gasket is arranged at an inclined hole of the part, a rubber friction pad is arranged on the right side wall of the part, the first sealing gasket and the rubber friction pad are respectively clamped by a shaped first clamping plate and a shaped second clamping plate, and a hollow air inlet bolt joint is arranged on the first clamping plate; the ventilation bottom plate is provided with a stepped groove, the stepped groove is provided with a second sealing gasket, an air hole cover plate and a third sealing gasket from top to bottom, and air flow channels communicated with the blind holes are formed at the bottom of the air hole cover plate and the bottom of the stepped groove; a cut-off device is also arranged in the air flow channel; the adjusting bolt of the stopping device is positioned at the bottom of the ventilation bottom plate and abuts against the flashboard positioned in the ventilation bottom plate, the top end of the flashboard is sleeved with a sealing ring, a spring base is arranged above the sealing ring, and two ends of the spring are respectively fixed on the spring base and the flashboard. The tool can not only leak all the blind holes at one time, but also leak and detect the blind holes one by one, thereby being convenient for maintenance.
Description
Technical Field
The invention belongs to the technical field of part leakage inspection, and particularly relates to a blind hole leakage detection tool with a plurality of blind holes in an end face.
Background
In the production of products, some parts needing to contact or store holes or grooves for hydraulic oil, fuel and lubricating oil are generally subjected to sealing detection, and whether cracks or other damages exist in the blind hole or not is verified under certain pressure so as to avoid leakage in use. For example, a component shown in fig. 1 is a rectangular parallelepiped, one end face of which is provided with a first blind hole 101, a second blind hole 102, and a third blind hole 103, the first blind hole 101 is communicated with the outside through an inclined hole 104, and the component is further provided with a bolt hole 105 and a positioning pin hole 106 for mounting the component. At present, the leakage detection of the parts is generally that each hole is connected with a leakage detection system one by one, the leakage detection medium is an air source generally, although the leakage detection medium is very simple in principle and convenient to implement, each hole is directly connected with the air source, so that the pipeline of the whole system is staggered, valves and pressure gauges are numerous and difficult to maintain, and potential safety hazards are easy to occur.
Disclosure of Invention
The invention aims to solve the technical problems and provides a hole-by-hole air tightness inspection tool for a plurality of blind holes on a part, which not only can perform leak detection on all the blind holes at one time, but also can perform leak detection on the blind holes (grooves) one by one, and the whole leak detection system is simple and compact, convenient to maintain and high in working flexibility.
The technical scheme of the invention is as follows:
multiple blind on partThe hole is by hole gas tightness inspection frock, and inclined hole entrance on the part left side wall is equipped with first sealed pad, on the right side wall with first sealed pad just right position department is equipped with rubber friction pad mutually, first sealed pad and rubber friction pad are presented respectively
The inner surfaces of the middle arched parts of the first clamping plate and the second clamping plate are pressed, the two clamping plates are connected and tightened through connecting bolts arranged at the two ends of each clamping plate to hold the part tightly, a hollow air inlet bolt joint is arranged on the first clamping plate, pipe threads are arranged at the two ends of the air inlet bolt joint, and the pipe threads at one end of the air inlet bolt joint are connected with the first clamping plate and communicated with the inclined hole;
the upper surface of the ventilation bottom plate is provided with a stepped groove which is gradually reduced from top to bottom, the stepped groove is sequentially and tightly provided with a second sealing gasket, an air hole cover plate and a third sealing gasket from top to bottom, the air hole cover plate and the groove with the smallest bottom of the stepped groove form an air flow channel, and the air flow channel penetrates through the second sealing gasket and the air hole cover plate and then is respectively communicated with each blind hole on a part; the air flow channel is also provided with a first stopping device for simultaneously stopping the second blind hole and the third blind hole air transmission channel and a second stopping device for only stopping the third blind hole air transmission channel;
the first stopping device and the second stopping device respectively comprise an adjusting bolt with a sealing filler wound on the threaded surface, the adjusting bolt is positioned in a threaded counter bore at the bottom of the ventilating bottom plate and screwed into the ventilating bottom plate from bottom to top and abuts against the bottom end of a flashboard also positioned in the ventilating bottom plate, a flat gasket and a fourth sealing gasket are sequentially arranged between a nut of the adjusting bolt and a step of the threaded counter bore from bottom to top, a sealing ring is tightly sleeved at the top end of the flashboard, a spring base welded and fixed on the bottom surface of the air hole cover plate is arranged right above the sealing ring, two ends of the spring are respectively fixed at the bottom of a spring mounting groove of the spring base and the top end of the flashboard, when the adjusting bolt is screwed downwards, the spring props the flashboard open to separate the sealing ring from the lower end surface of the spring base, when the adjusting bolt is screwed, the adjusting bolt upwards props the sealing ring to a position where the end surface of the spring mounting groove of the spring base is tightly attached to the end surface of the flashboard, so as to stop the air flow passage, and when the adjusting bolt is fully screwed into the threaded counter bore, the flashboard incompletely slides out of the ventilating bottom plate;
all blind hole orifices on the part are arranged in a manner of clinging to the second sealing gasket, the edges of the blind hole orifices are completely sealed by the second sealing gasket, the part is connected with the ventilating bottom plate in a positioning manner through bolts and taper pins, wherein the bolts penetrate through threaded holes on the part and then are screwed into the ventilating bottom plate, and the taper pins penetrate through positioning pin holes on the part and then extend into the ventilating bottom plate.
Furthermore, a cuboid boss is arranged at the top end of the flashboard, rectangular sealing grooves are formed in steps around the boss, one half of the sealing ring is embedded into the sealing groove, and the other half of the sealing ring extends out of the sealing groove; when the flashboard is jacked upwards, the boss can extend into the spring mounting groove of the spring base and is in transition fit with the spring mounting groove.
Furthermore, the lower sides of the first clamping plate and the second clamping plate are connected with a supporting and positioning cylinder for supporting and positioning the first clamping plate and the second clamping plate, the bottom end of the supporting and positioning cylinder is integrally provided with a circular ring plate, the circular ring plate is connected with the ventilating bottom plate through a pin, and tolerance matching between the pin and a pin hole is realized through matching
Furthermore, grooves are symmetrically arranged on the left side wall and the right side wall of the part in a left-right mode, the bottom of the groove on the left side is located at the entrance of the inclined hole, and the first sealing gasket and the rubber friction gasket are located in the grooves on the left side and the right side respectively.
The invention has the beneficial effects that: the invention is connected with an external compressed air source through an air inlet bolt joint on the inclined hole, the compressed air source enters the first blind hole, passes through the second sealing gasket and the air hole cover plate and then enters an air flow channel formed by the air hole cover plate and the ventilation bottom plate, the air flow channel is respectively communicated with the second blind hole and the third blind hole in sequence, and compressed air is sent into the second blind hole and the third blind hole; when the first stopping device is closed, namely the sealing ring is tightly attached to the end face of the spring mounting notch of the spring base, only the first blind hole is tested for leak detection, and the change condition of the pressure gauge is observed; after the first blind hole is detected to be qualified, the first stopping device is opened and the second stopping device is continuously closed, at the moment, the first and second blind holes are simultaneously tested, and because the first blind hole is detected completely, the change of the pressure gauge represents the leak detection result of the second blind hole; in a similar way, the second blind hole is qualified in detection, the second stopping device is opened, at the moment, the compressed gas is led to the three blind holes, and the change result of the pressure gauge at the moment is the detection result of the third blind hole due to the fact that the first two blind holes are finished in detection. According to different detection requirements, the tool can flexibly select and detect some blind holes without full detection.
Drawings
Fig. 1 is a schematic structural view of a part.
FIG. 2 is a top view of the present invention.
Fig. 3 is a sectional view taken along line a-a in fig. 2.
Fig. 4 is an enlarged view at I in fig. 3.
Fig. 5 is a schematic view of the structure of fig. 3 when the cut-off device at I is opened.
Figure 6 is a top view of the vent panel at the step groove.
Fig. 7 is a top view of the vent cover plate.
Fig. 8 is a sectional view of a shutter and spring mount mounting structure provided with bosses, sealing grooves.
Fig. 9 is a plan view of the shutter provided with the boss and the seal groove.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in figures 2-7, the hole-by-hole air tightness inspection tool for a plurality of blind holes on a part is characterized in that a first sealing gasket 2 is arranged at the inlet of an inclined hole 104 on the left side wall of the part 1, a rubber friction pad 3 is arranged at the position, opposite to the first sealing gasket 2, on the right side wall of the part, and the first sealing gasket 2 and the rubber friction pad 3 are respectively shaped
The inner surfaces of the middle arched parts of the first clamping plate 4 and the second clamping plate 5 are pressed, the two clamping plates are connected and tightened through connecting bolts 6 arranged at the two ends of each clamping plate, the part 1 is held tightly, a hollow air inlet bolt joint 15 is arranged on the first clamping plate 4, pipe threads are arranged at the two ends of the air inlet bolt joint 15, and the pipe threads at one end of each air inlet bolt joint are connected with the first clamping plate 4 and communicated with the inclined hole 104. The rubber friction pad 3 is mainly used for increasing the friction force and improving the clamping force of the second clamping plate 5 to the part 1.
The invention also comprises a ventilation bottom plate 7, wherein the upper surface of the ventilation bottom plate 7 is provided with a step-shaped stepped groove which is sequentially reduced from top to bottom, the stepped groove is sequentially and tightly provided with a second sealing gasket 10, an air hole cover plate 11 and a third sealing gasket 12 from top to bottom, the air hole cover plate 11 and the groove with the smallest bottom of the stepped groove form an air flow channel a, and the air flow channel a is respectively communicated with each blind hole on the part 1 after penetrating through the second sealing gasket 10 and the air hole cover plate 11; the air flow channel a is also provided with a first stopping device 13 for simultaneously stopping the air transmission channels of the second blind hole 102 and the third blind hole 103 and a second stopping device 14 for only stopping the air transmission channel of the third blind hole 103, namely, the first stopping device 13 is arranged between the first vent hole b and the second vent hole c which are communicated with the air flow channel a through the first blind hole 101 and the second blind hole 102, and the second stopping device 14 is arranged between the second vent hole c and the third vent hole d.
The first stopping device 13 and the second stopping device 14 both include an adjusting bolt 1301 with a sealing filler wound on the thread surface, the sealing filler may be a common raw rubber tape, which is mainly convenient for maintaining the sealing performance between the thread couplings when the adjusting bolt 1301 is screwed, the adjusting bolt 1301 is located in a thread counter bore at the bottom of the vent base plate 7, in order to further ensure the sealing performance between the thread pairs, the adjusting bolt 1301 and the thread part of the thread counter bore may be designed into a sealing pipe thread with a self-sealing function, so that the sealing is maintained all the time during the screwing process. An adjusting bolt 1301 is screwed into the ventilating bottom plate 7 from bottom to top and abuts against the bottom end of a gate plate 1304 which is also positioned in the ventilating bottom plate 7, a flat gasket 1302 and a fourth sealing gasket 1303 are sequentially arranged between a nut of the adjusting bolt 1301 and a step of the threaded counter bore from bottom to top, the top end of the gate plate 1304 is tightly sleeved with a sealing ring 1305, a spring base 1307 which is welded and fixed on the bottom surface of the air vent cover plate 11 is arranged right above the sealing ring 1305, the spring base 1307 and the air vent cover plate 11 are formed by full welding, and a welding seam 1308 of the adjusting bolt is subjected to nondestructive testing and is seamless and non-leakage. Two ends of a spring 1306 are respectively fixed on the bottom of a spring mounting groove of a spring base 1307 and the top end of a shutter 1304, when the adjusting bolt 1301 is screwed downwards, as shown in fig. 5, the spring 1306 pushes the shutter 1304 open to separate a sealing ring 1305 from the lower end face of the spring base 1307, when the adjusting bolt 1301 is screwed in, the adjusting bolt 1301 pushes the shutter 1304 upwards to a position where the sealing ring 1305 is tightly attached to the end face of the spring mounting groove of the spring base 1307, so that the air flow passage a is cut off, and when the adjusting bolt 1301 is completely screwed in the threaded counter bore, the shutter 1304 does not completely slide out of the vent base plate 7.
All blind hole orifices on the part 1 are tightly attached to the second sealing gasket 10, the edges of the blind hole orifices are completely sealed by the second sealing gasket 10, the part 1 is connected with the ventilating bottom plate 7 in a positioning mode through bolts 8 and taper pins 9, wherein the bolts 8 penetrate through threaded holes 105 on the part 1 and then are screwed into the ventilating bottom plate 7, and the taper pins 9 penetrate through positioning pin holes 106 on the part 1 and then extend into the ventilating bottom plate 7.
Further, as shown in fig. 8 and 9, a rectangular boss 130401 is provided at the top end of the shutter 1304, a rectangular sealing groove 130403 is provided on a step 130402 around the boss 130401, one half of the sealing ring 1305 is embedded into the sealing groove 130403, and the other half of the sealing ring 1305 extends out of the sealing groove 130403; when the shutter 1304 is lifted upwards, the bosses 130401 can extend into the spring mounting grooves of the spring base 1307 and are in transition fit with the spring mounting grooves. The structural design is to facilitate the better closing of the stopping device, and the boss 130401 and the spring installation groove are in transition fit to play a certain guiding role, so that the sealing ring 1305 is better contacted and closed with the port of the spring base 1307. Half of the sealing ring 1305 is embedded in the sealing groove 130403, so that the sealing ring 1305 is more stably installed, and the closing of the stopping device is more reliable.
Further, as shown in fig. 2, a supporting and positioning cylinder 16 for supporting and positioning the first clamping plate 4 and the second clamping plate 5 is connected to the lower side of the first clamping plate 4 and the second clamping plate 5, a circular ring plate is integrally arranged at the bottom end of the supporting and positioning cylinder 16, the circular ring plate is connected with the ventilating bottom plate 7 by a pin 17, and the tolerance fit between the pin 17 and a pin hole is that the pin 17 is located
The supporting and positioning cylinder 16 is used for supporting when the first clamping plate 4 and the second clamping plate 5 are installed, and is convenient to install and fix each clamping plate, on the other hand, the pin 17 is additionally arranged for aligning the matching threaded hole of the air inlet bolt joint 15 on the arched part of the first clamping plate 4 with the inclined hole 104, and the tolerance between the pin 17 and the pin hole is matched and matched as ^ or ^ based on the tolerance between the pin 17 and the pin hole>
The clearance value reaches 0.31-0.63 mm, the matching threaded holes can be aligned with the inclined holes 104 as much as possible, and the connection tension of the connecting bolts 6 at the two ends of the first clamping plate 4 and the second clamping plate 5 cannot be influenced because the clearance is too small.
Further, be equipped with the recess in the left and right sides wall difference bilateral symmetry of part 1, left recess tank bottom is located inclined hole 104 entrance, first sealed 2 and the rubber friction pad 3 of filling up is located the left and right sides respectively in the recess to set up first sealed 2 and the rubber friction pad 3 of filling up in advance on part 1, install, press from both sides tightly more conveniently.
The invention is not limited to the test detection of the specific parts shown in fig. 1, and the tool can be used for testing through hole runners or other parts needing leakage detection, for example, for the inspection of through holes, the detection of whether the wall of the through hole has sand hole defects or not, and the like, one end of the through hole can be blocked, and the through hole can be converted into a similar model part shown in fig. 1 for detection.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (4)
1. The utility model provides a hole-by-hole gas tightness inspection frock of a plurality of blind holes on part which characterized in that: inclined hole (104) entrance on part (1) left side wall is equipped with first sealed pad (2), on the right side wall with first sealed pad (2) just right position department is equipped with rubber friction pad (3) mutually, first sealed pad (2) and rubber friction pad (3) are being respectively
The inner surfaces of the middle arched parts of the first clamping plate (4) and the second clamping plate (5) are pressed, the two clamping plates are connected and tightened through connecting bolts (6) arranged at the two ends of each clamping plate, the part (1) is held tightly, a hollow air inlet bolt joint (15) is arranged on the first clamping plate (4), pipe threads are arranged at the two ends of the air inlet bolt joint (15), and the pipe threads at one end of the air inlet bolt joint are connected with the first clamping plate (4) and communicated with the inclined hole (104);
the air vent structure is characterized by further comprising a vent bottom plate (7), wherein a stepped groove which is sequentially reduced from top to bottom is formed in the upper surface of the vent bottom plate (7), a second sealing gasket (10), an air hole cover plate (11) and a third sealing gasket (12) are sequentially and tightly arranged on the stepped groove from top to bottom, the air hole cover plate (11) and the groove with the smallest bottom of the stepped groove form an air flow channel (a), and the air flow channel (a) penetrates through the second sealing gasket (10) and the air hole cover plate (11) and then is respectively communicated with each blind hole in the part (1); the air flow channel (a) is also provided with a first stopping device (13) for simultaneously stopping the air transmission channel of the second blind hole (102) and the third blind hole (103) and a second stopping device (14) for only stopping the air transmission channel of the third blind hole (103);
the first stopping device (13) and the second stopping device (14) respectively comprise an adjusting bolt (1301) with a sealing packing wound on the threaded surface, the adjusting bolt (1301) is positioned in a threaded counter bore at the bottom of the ventilating base plate (7), the adjusting bolt (1301) is screwed into the ventilating base plate (7) from bottom to top and is abutted against the bottom end of the gate plate (1304) also positioned in the ventilating base plate (7), a flat gasket (1303) and a fourth gasket (1303) are sequentially arranged between a nut of the adjusting bolt (1301) and a step of the threaded counter bore from bottom to top, the top end of the gate plate (1304) is tightly sleeved with a sealing ring (1305), a spring base (1307) welded and fixed on the bottom surface of the air vent cover plate (11) is arranged right above the sealing ring (1305), two ends of a spring (1306) are respectively fixed on the bottom of a spring mounting groove of the spring base (1307) and the top end of the gate plate (1304), when the adjusting bolt (1301) is screwed downwards, the spring (1306) pushes the sealing ring (1304) open to enable the sealing ring (1304) to separate from the bottom surface of the spring mounting groove (1307), and the adjusting bolt (1304) is tightly attached to the top end surface of the adjusting bolt (1304), so that the spring (1304) when the adjusting bolt (1301 a) is separated from the air flow channel (1304), and the spring (1304) is tightly attached to the air flow channel (1304), and when the adjusting bolt (1301) is completely screwed into the threaded counter bore, the shutter (1304) does not completely slide out of the vent base plate (7);
all blind hole orifices on the part (1) are arranged in a manner of clinging to the second sealing gasket (10), the edges of the blind hole orifices are completely sealed by the second sealing gasket (10), the part (1) and the ventilation bottom plate (7) are connected in a positioning mode through bolts (8) and taper pins (9), wherein the bolts (8) penetrate through threaded holes 105 on the part (1) and then are screwed into the ventilation bottom plate (7), and the taper pins (9) penetrate through positioning pin holes (106) on the part (1) and then extend into the ventilation bottom plate (7).
2. The tool for checking the air tightness of the plurality of blind holes on the part according to claim 1, wherein: a cuboid-shaped boss (130401) is arranged at the top end of the flashboard (1304), a rectangular sealing groove (130403) is formed in a step (130402) on the periphery of the boss (130401), one half of the sealing ring (1305) is embedded into the sealing groove (130403), and the other half of the sealing ring extends out of the sealing groove (130403); when the gate plate (1304) is lifted upwards, the boss (130401) can extend into a spring mounting groove of the spring base (1307) and is in transition fit with the spring mounting groove.
3. The tool for checking the air tightness of the plurality of blind holes on the part according to claim 1, wherein: the lower sides of the first clamping plate (4) and the second clamping plate (5) are connected with a supporting and positioning cylinder (16) used for supporting and positioning the first clamping plate (4) and the second clamping plate (5), the bottom end of the supporting and positioning cylinder (16) is integrally provided with a circular ring plate, the circular ring plate is connected with the ventilating bottom plate (7) through a pin (17), and the pin (17) is matched with the tolerance between pin holes in the circular ring plate
4. The tool for checking the air tightness of the plurality of blind holes on the part according to claim 1, wherein: the left side wall and the right side wall of the part (1) are respectively provided with grooves in a bilateral symmetry mode, the bottoms of the grooves on the left side are located at the inlets of the inclined holes (104), and the first sealing gasket (2) and the rubber friction gasket (3) are respectively located on the left side and the right side in the grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611211927.5A CN106706233B (en) | 2016-12-25 | 2016-12-25 | Hole-by-hole air tightness inspection tool for multiple blind holes in part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611211927.5A CN106706233B (en) | 2016-12-25 | 2016-12-25 | Hole-by-hole air tightness inspection tool for multiple blind holes in part |
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| Publication Number | Publication Date |
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| CN106706233A CN106706233A (en) | 2017-05-24 |
| CN106706233B true CN106706233B (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611211927.5A Active CN106706233B (en) | 2016-12-25 | 2016-12-25 | Hole-by-hole air tightness inspection tool for multiple blind holes in part |
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| CN (1) | CN106706233B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112284638B (en) * | 2020-10-26 | 2023-01-06 | 北京卫星环境工程研究所 | Spacecraft flexible product leak detection test auxiliary device |
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| WO2011089707A1 (en) * | 2010-01-22 | 2011-07-28 | 日鍛バルブ株式会社 | Method of testing air-tightness of hermetically sealed lash adjuster |
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| CN105910769A (en) * | 2016-05-18 | 2016-08-31 | 宣月罗 | Automated leakage detection device |
| CN206292013U (en) * | 2016-12-25 | 2017-06-30 | 重庆德运模具制造有限公司 | The hole-specifically air tight test frock of multiple blind holes on a kind of part |
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- 2016-12-25 CN CN201611211927.5A patent/CN106706233B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101044384A (en) * | 2004-10-19 | 2007-09-26 | 苏德罗尼克股份公司 | Method and device for testing the impermealbility of tear-off lids |
| AU2007231923A1 (en) * | 2006-04-04 | 2007-10-11 | Structural Monitoring Systems Ltd | Method for detecting separation in a structure |
| WO2011089707A1 (en) * | 2010-01-22 | 2011-07-28 | 日鍛バルブ株式会社 | Method of testing air-tightness of hermetically sealed lash adjuster |
| CN203443746U (en) * | 2013-03-29 | 2014-02-19 | 重庆德运模具制造有限公司 | Leak detection machine for automobile engine |
| EP3021997A1 (en) * | 2014-09-19 | 2016-05-25 | Hartmut Flaig | Sealing surface correcting device for sealing screws, system, and method |
| CN105043673A (en) * | 2015-08-07 | 2015-11-11 | 广州飞机维修工程有限公司 | Airplane starter rotor sealing performance testing tool |
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Effective date of registration: 20200622 Address after: 402260 No.13 Xiangfu Avenue, Shuangfu street, Jiangjin District, Chongqing Applicant after: Chongqing wanmg Magnesium Products Co.,Ltd. Address before: 402260 Jiangjin District, Chongqing Fu Industrial Park, the relocation of the integrated building A District, building 2-2, No. 1 Applicant before: CHONGQING DEYUN MOULD MANUFACTURING Co.,Ltd. |
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