CN108303224B - Food cans air tightness detection equipment - Google Patents
Food cans air tightness detection equipment Download PDFInfo
- Publication number
- CN108303224B CN108303224B CN201810210487.4A CN201810210487A CN108303224B CN 108303224 B CN108303224 B CN 108303224B CN 201810210487 A CN201810210487 A CN 201810210487A CN 108303224 B CN108303224 B CN 108303224B
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- venthole
- food cans
- pressure inlet
- vertical
- floating
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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
- G01M3/32—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 for containers, e.g. radiators
- G01M3/3209—Details, e.g. container closure devices
-
- 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
- G01M3/32—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 for containers, e.g. radiators
- G01M3/3236—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 for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—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 for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a kind of food cans air tightness detection equipments, it is desirable to provide one kind can quickly detect the food cans air tightness detection equipment of the air-tightness of the food cans of canned food.It includes rack；The food cans positioning seat being arranged on the rack；And air tightness detection mechanism, air tightness detection mechanism includes booster pump, horizontal pressure foot above food cans positioning seat, it is arranged on the rack and is located at the vertical guide sleeve above horizontal pressure foot, vertical guide rod on horizontal pressure foot and with the cooperation of vertical guide sleeve is set, along the floating support plate of vertical guide rod lifting, it is arranged on the rack the lifting cylinder for going up and down floating support plate, end face seal gasket on horizontal pressure foot lower surface is set, sealing cylinder on the lower surface of end face seal gasket is set, the connecting tube of the vertical pressure inlet of upper end opening on horizontal pressure foot and the upper end opening of connection booster pump and vertical pressure inlet is set.
Description
Technical field
The present invention relates to a kind of air tightness detection equipments, and in particular to a kind of food cans air tightness detection equipment.
Background technique
Food canning i.e. by seal food in a reservoir, by process for sterilizing process by most microorganism killings,
Closed and vacuum condition is maintained, the method for preserving of long-term stable food at room temperature is able to.The air-tightness of canned food determines
The quality and qualification rate of canned food, thus before canning, need the gas of the food cans to canned foods such as dry plate tanks
Close property is detected, to avoid causing food microbial contamination in tank because of the gas leakage of food cans, go bad, leads to product
Qualification rate reduces.
Summary of the invention
The purpose of the invention is to provide a kind of air-tightness of food cans that can quickly detect canned food, avoid because
The gas leakage of food cans and the food cans air tightness detection equipment for causing food microbial contamination in tank, rotten problem.
The technical scheme is that
A kind of food cans air tightness detection equipment, comprising: rack；The food cans positioning seat being arranged on the rack, food cans
The upper surface of positioning seat is equipped with the food cans locating slot for positioning food cans；And air tightness detection mechanism, air-leakage test
Mechanism includes booster pump, the horizontal pressure foot above food cans positioning seat, is arranged on the rack and is located above horizontal pressure foot
Vertical guide sleeve, be arranged on horizontal pressure foot and with the vertical guide rod of vertical guide sleeve cooperation, from bottom to top be successively set on it is vertical
The first limited block, the second limited block on guide rod lateral surface and third limited block, along the lifting of vertical guide rod floating support plate, set
Set on the rack for go up and down the lifting cylinder of floating support plate, the end face seal gasket being arranged on horizontal pressure foot lower surface,
Having the closed sealing cylinder for inflating inner cavity, being arranged under sealing cylinder on the lower surface of end face seal gasket is set
The vertical pressure inlet of air pressure detection sensor, the upper end opening being arranged on horizontal pressure foot on end face connects booster pump and erects
The connecting tube of the upper end opening of straight pressure inlet, the floating sliding sleeve being slidably located on vertical pressure inlet and floating sliding sleeve is set
The lower end of lower seal and upper seal on medial surface, the vertical guide rod is connected with horizontal pressure foot, the third limit
Block is located at the lower section of vertical guide sleeve, and the floating support plate is between the first limited block and the second limited block, floating support plate
It is connected with floating sliding sleeve, the upper end of the vertical pressure inlet is located at the top of horizontal pressure foot, and the lower end of vertical pressure inlet is from upper
Horizontal pressure foot, end face seal gasket and sealing cylinder and the lower section for being located at sealing cylinder are sequentially passed through under and, vertical pressure inlet
Lateral surface is equipped with the first venthole, the second venthole and the third venthole that are connected with the inner cavity of vertical pressure inlet, and first
Venthole is located at the top of horizontal pressure foot, and the second venthole is positioned at inflation inner cavity, and the connection of the second venthole is inflated inner cavity and erected
The inner cavity of straight pressure inlet, third venthole is located at the lower section of sealing cylinder, when floating support plate is against on the second limited block: the
One venthole is located at the lower section of floating sliding sleeve；When floating support plate is against on the first limited block: the first venthole, which is located at, to float
Between lower seal and upper seal in sliding sleeve.
The food cans air tightness detection equipment of this programme can quickly detect the air-tightness of the food cans of canned food, avoid
Food microbial contamination in tank, rotten problem are caused because of the gas leakage of food cans.
Preferably, the lower end closed of vertical pressure inlet, the lower end of vertical pressure inlet is equipped with end face through-hole, vertical pressure inlet
Medial surface be equipped with annular upper limit position block and annular lower position block, in vertical pressure inlet and be located at annular upper limit position block and annular
Floating piston is equipped between lower position block, vertical pressure inlet is interior and is located at the lower section of floating piston equipped with piston reset spring, institute
Annular upper limit position block is stated between the first venthole and the second venthole, the second venthole and third venthole are located in annular
Between limited block and annular lower position block, when floating piston is against on annular upper limit position block, the second venthole and third are ventilated
Hole is located at the lower section of floating piston；When floating piston is against on annular lower position block, the second venthole and third ventilation hole location
In the top of floating piston.
Preferably, sealing cylinder is cylindrical body, the axis vertical setting of cylinder is sealed.
Preferably, if the lateral surface of sealing cylinder is equipped with the ring packing protrusion that arterial highway is sequentially distributed from bottom to top.
Preferably, being additionally provided with switch valve between connecting tube and the upper end opening of vertical pressure inlet.
Preferably, end face seal gasket is rubber sheet gasketing.
Preferably, sealing cylinder is rubber seal cylinder.
The beneficial effects of the present invention are: the air-tightness of the food cans of canned food can be detected quickly, avoid because of food cans
Gas leakage and cause food microbial contamination in tank, rotten problem.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of food cans air tightness detection equipment of the invention.
Fig. 2 is a kind of partial enlarged view in Fig. 1 at A.
Fig. 3 is a kind of structural schematic diagram of food cans air tightness detection equipment of the invention in actual application.
In figure:
Rack 1；
Food cans positioning seat 2, food cans locating slot 2.1；
Air tightness detection mechanism 3, horizontal pressure foot 3.1, end face seal gasket 3.2 inflate inner cavity 3.3, seal cylinder 3.4,
Air pressure detection sensor 3.5, vertical guide sleeve 3.6, vertical guide rod 3.7, lifting cylinder 3.8, floating support plate 3.9, the first limit
Block 3.10, the second limited block 3.11 and third limited block 3.12, vertical pressure inlet 3.13, floating sliding sleeve 3.14, switch valve 3.15,
Upper seal 3.16, lower seal 3.17, the first venthole 3.18, annular upper limit position block 3.19, floating piston 3.20, second is logical
Stomata 3.21, third venthole 3.22, annular lower position block 3.23, piston reset spring 3.24, end face through-hole 3.25；
Food cans 4.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing:
As shown in Figure 1, a kind of food cans air tightness detection equipment, positions including rack 1, the food cans being arranged on the rack
Seat 2 and air tightness detection mechanism 3.
The upper surface of food cans positioning seat is equipped with the food cans locating slot 2.1 for positioning food cans, food cans locating slot
Bottom surface be horizontal plane.Food cans locating slot is circular groove in the present embodiment.
As shown in Figure 1 and Figure 2, air tightness detection mechanism includes booster pump, the horizontal pressure foot above food cans positioning seat
3.1, be arranged on the rack and be located at horizontal pressure foot above vertical guide sleeve 3.6, be arranged on horizontal pressure foot and with vertical guide sleeve
The vertical guide rod 3.7 of cooperation, the first limited block 3.10, second being successively set on vertical guide rod lateral surface from bottom to top limit
Block 3.11 and third limited block 3.12, along the lifting of vertical guide rod floating support plate 3.9, be arranged on the rack and float for going up and down
The lifting cylinder 3.8 of support plate, is arranged in end face seal pad the end face seal gasket 3.2 being arranged on horizontal pressure foot lower surface
The sealing cylinder 3.4 with closed inflation inner cavity 3.3, the gas being arranged on the lower end surface of sealing cylinder on the lower surface of piece
Press detection sensor 3.5, the vertical pressure inlet 3.13 for the upper end opening being arranged on horizontal pressure foot, connection booster pump and vertical increasing
The connecting tube of the upper end opening of pressure pipe, the floating sliding sleeve 3.14 being slidably located on vertical pressure inlet and floating sliding sleeve is set
Upper seal 3.16 and lower seal 3.17 on medial surface.The gravity of horizontal pressure foot be greater than floating sliding sleeve and vertical pressure inlet it
Between frictional force.
End face seal gasket is rubber sheet gasketing.In the present embodiment, the thickness of end face seal gasket is greater than 5 millimeters.
Sealing cylinder is rubber seal cylinder.Sealing cylinder is cylindrical body, seals the axis vertical setting of cylinder.Sealing column
Body is located at the top of food cans locating slot.Seal the axis of cylinder and the axis coaxle of food cans locating slot.
If the lateral surface of sealing cylinder is equipped with the ring packing protrusion that arterial highway is sequentially distributed from bottom to top.
Switch valve 3.15 is additionally provided between connecting tube and the upper end opening of vertical pressure inlet.In the present embodiment, connecting tube is
Connect hose.
The lower end of vertical guide rod is connected with horizontal pressure foot.
Third limited block is located at the lower section of vertical guide sleeve.Floating support plate is led vertically equipped with what is matched with vertical guide rod
To through-hole, vertical guide rod passes through corresponding vertical guide through hole.Floating support plate be located at the first limited block and the second limited block it
Between.Floating support plate is connected with floating sliding sleeve.
The upper end of vertical pressure inlet is located at the top of horizontal pressure foot.The lower end of vertical pressure inlet sequentially passes through water from top to bottom
Flat clamp, end face seal gasket and sealing cylinder and the lower section for being located at sealing cylinder.The lateral surface of vertical pressure inlet be equipped with
The first venthole 3.18, the second venthole 3.21 and the third venthole 3.22 that the inner cavity of vertical pressure inlet is connected.First is logical
Stomata is located at the top of horizontal pressure foot.Second venthole is located at inflation inner cavity, and the second venthole connection inflation inner cavity and vertical
The inner cavity of pressure inlet.Third venthole is located at the lower section of sealing cylinder.The lower end closed of vertical pressure inlet, under vertical pressure inlet
End is equipped with end face through-hole 3.25.
The medial surface of vertical pressure inlet is equipped with annular upper limit position block 3.19 and annular lower position block 3.23.Vertical pressure inlet
It is interior and be located between annular upper limit position block and annular lower position block and be equipped with floating piston 3.20.In vertical pressure inlet and it is located at floating
The lower section of piston is equipped with piston reset spring 3.24.Annular upper limit position block is between the first venthole and the second venthole, and
Two ventholes and third venthole are located between annular upper limit position block and annular lower position block.
As shown in Fig. 2, the second venthole and third venthole are positioned at floating when floating piston is against on annular upper limit position block
The lower section of piston.
When floating piston is against on annular lower position block, the second venthole is located at the upper of floating piston with third venthole
Side.
As shown in Figure 1, when floating support plate is against on the second limited block: the first venthole is located under floating sliding sleeve
Side.
When floating support plate is against on the first limited block: the first venthole be located at lower seal in floating sliding sleeve with it is upper
Between sealing ring.
The specific works of the food cans air tightness detection equipment of the present embodiment are as follows:
The original state of food cans air tightness detection equipment, as shown in Figure 1, at this point, third limited block is against vertical guide sleeve
Lower end surface on, floating piston is against on annular upper limit position block, and floating support plate is against on the second limited block.
First, food cans 4 are placed in food cans locating slot, the upper port of food cans upward, is positioned by food cans
Slot positions food cans, as shown in Figure 3.
Second, lifting cylinder drives floating support plate to move down, in this process:
Horizontal pressure foot, vertical guide rod, end face seal gasket, sealing cylinder will be erected with vertical pressure inlet in Gravitative Loads lower edge
Straight guide sleeve moves down, and when end face seal gasket is against on the upper surface of food cans, horizontal pressure foot, vertical guide rod, end face are close
Gasket, sealing cylinder and the stopping of vertical pressure inlet move down, at this point, sealing cylinder and air pressure detection sensor are located at food cans
In upper port (outer diameter of sealing cylinder is less than the internal diameter of food cans)；
Then, lifting cylinder drives floating support plate to continue to move down, and in this process: floating sliding sleeve is along vertical pressure inlet
It moving down, after floating support plate is against on the first limited block, lifting cylinder drives floating support plate to continue to move down 1 millimeter,
Then lifting cylinder stops working, at this time: the first venthole is located between the lower seal and upper seal in floating sliding sleeve, the
One venthole is not in communication with the outside, and end face seal gasket is pressed on the upper surface of food cans, end face seal gasket and food
First of sealing (end face seal) is formed between the upper surface of product tank.
Third opens switch valve, is pressurized pump work, is inflated in vertical pressure inlet by booster pump and connecting tube, at this
During a:
Floating piston in vertical pressure inlet moves down first, when floating sliding sleeve be located at the second venthole and third venthole it
Between when, inflation inner cavity will be entered by the second venthole by being pressurized the gas that is pumped into vertical pressure inlet, make to seal cylinder expansion
And be against on the medial surface of food cans, thus in the medial surface (medial surface close to food cans upper end) of sealing cylinder and food cans
Between formed second sealing (medial surface sealing)；
Then, floating piston continues to move down, until floating piston is against on annular lower position block, at this point, booster pump
The gas being pressed into vertical pressure inlet will be entered in food cans by third venthole；When baroceptor detects in food cans
Air pressure when reaching setting value P1, switch valve is closed, and booster pump stops working, and after food cans pressure maintaining 6 seconds, then passes through air pressure
Sensor detects the air pressure P2 in food cans；
Followed by calculating two draught head △ P, △ P=P1- P2；
If △ P is less than setting value, illustrate that canned food air-tightness meets the requirements；
If △ P is greater than the set value, illustrate that canned food air-tightness is undesirable.
In addition, in this process, due to forming first of sealing between end face seal gasket and the upper surface of food cans,
It seals and forms second sealing between cylinder and the medial surface of food cans, can guarantee in food cans pressure maintaining period in this way, eat
Gas in product tank will not be bad because of the sealing effect between end face seal gasket and food cans, generates gas leakage, and causes △ P big
In setting value, the problem of erroneous judgement by accident, the detection accuracy of the air-tightness of food cans is effectively improved.
4th, lifting cylinder drives floating support plate to move up, in this process:
Floating support plate and floating sliding sleeve will first move up (horizontal pressure foot, vertical guide rod, end face seal gasket, sealing cylinder
It is kept essentially stationary with vertical pressure inlet), when the first venthole is located at the lower section of floating sliding sleeve, the first venthole and the external world are even
It is logical, to make gas intracavitary in inflation by the second venthole, vertical pressure inlet and the discharge of the first venthole, to make to seal
Cylinder shrinks and separates with food cans；After floating support plate is against on the second limited block, floating support strip move horizontal pressure foot,
Vertical guide rod, end face seal gasket, sealing cylinder up move in place together with vertical pressure inlet；Meanwhile floating piston is in work
It up moves, reset under the action of plug reset spring；
Since sealing cylinder is shunk and is separated with food cans, in this way after floating support plate is against on the second limited block, float
Dynamic support plate drives horizontal pressure foot, vertical guide rod, end face seal gasket, sealing cylinder up to move together with vertical pressure inlet
In the process, food cans not will drive and move up (sealing cylinder contraction is separated with food cans) together, cylinder is sealed and food cans are smooth
Separation guarantees that the food cans for completing air-leakage test can smoothly be taken out.
5th, take out the food cans for completing air-leakage test.
Claims (6)
1. a kind of food cans air tightness detection equipment, characterized in that include:
Rack；
The food cans positioning seat being arranged on the rack, the upper surface of food cans positioning seat are equipped with the food cans for positioning food cans
Locating slot；And
Air tightness detection mechanism, air tightness detection mechanism include booster pump, the horizontal pressure foot above food cans positioning seat, set
The vertical guide sleeve on the rack and being located above horizontal pressure foot is set, is arranged on horizontal pressure foot and is with the cooperation of vertical guide sleeve vertical
Guide rod, the first limited block being successively set on vertical guide rod lateral surface from bottom to top, the second limited block and third limited block, edge
The floating support plate of vertical guide rod lifting is arranged on the rack lifting cylinder for going up and down floating support plate, is arranged in level
End face seal gasket on pressing plate lower surface, be arranged on the lower surface of end face seal gasket with closed inflation inner cavity
Sealing cylinder, the air pressure detection sensor being arranged on the lower end surface of sealing cylinder, the upper end opening being arranged on horizontal pressure foot
Vertical pressure inlet, connection booster pump and vertical pressure inlet upper end opening connecting tube, be slidably located on vertical pressure inlet
Floating sliding sleeve and the lower seal and upper seal that are arranged on the medial surface of floating sliding sleeve,
The lower end of the vertical guide rod is connected with horizontal pressure foot, and the third limited block is located at the lower section of vertical guide sleeve, described
Between the first limited block and the second limited block, floating support plate is connected floating support plate with floating sliding sleeve,
The upper end of the vertical pressure inlet is located at the top of horizontal pressure foot, and the lower end of vertical pressure inlet sequentially passes through water from top to bottom
Flat clamp, end face seal gasket and sealing cylinder are simultaneously located at the lower section of sealing cylinder, the lateral surface of vertical pressure inlet be equipped with
The first venthole, the second venthole and the third venthole that the inner cavity of vertical pressure inlet is connected, the first venthole are located at level
The top of pressing plate, the second venthole are located at inflation inner cavity, and the inner cavity of the connection inflation of the second venthole inner cavity and vertical pressure inlet,
Third venthole is located at the lower section of sealing cylinder,
When floating support plate is against on the second limited block: the first venthole is located at the lower section of floating sliding sleeve；
When floating support plate is against on the first limited block: the first venthole is located at lower seal and upper sealing in floating sliding sleeve
Between circle；
The end face seal gasket is rubber sheet gasketing.
2. a kind of food cans air tightness detection equipment according to claim 1, characterized in that under the vertical pressure inlet
End seal is closed, and the lower end of vertical pressure inlet is equipped with end face through-hole, and the medial surface of vertical pressure inlet is equipped with annular upper limit position block and ring
Shape lower position block, vertical pressure inlet is interior and is located between annular upper limit position block and annular lower position block equipped with floating piston, vertically
In pressure inlet and be located at the lower section of floating piston and be equipped with piston reset spring, the annular upper limit position block be located at the first venthole and
Between second venthole, the second venthole and third venthole are located between annular upper limit position block and annular lower position block,
When floating piston is against on annular upper limit position block, the second venthole is located at the lower section of floating piston with third venthole；
When floating piston is against on annular lower position block, the second venthole is located at the top of floating piston with third venthole.
3. a kind of food cans air tightness detection equipment according to claim 1, characterized in that the sealing cylinder is cylinder
Body seals the axis vertical setting of cylinder.
4. a kind of food cans air tightness detection equipment according to claim 1 or 2 or 3, characterized in that the sealing cylinder
If lateral surface be equipped with arterial highway be sequentially distributed from bottom to top ring packing protrusion.
5. a kind of food cans air tightness detection equipment according to claim 1 or 2 or 3, characterized in that the connecting tube with
Switch valve is additionally provided between the upper end opening of vertical pressure inlet.
6. a kind of food cans air tightness detection equipment according to claim 1 or 2 or 3, characterized in that the sealing cylinder
For rubber seal cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810210487.4A CN108303224B (en) | 2018-03-14 | 2018-03-14 | Food cans air tightness detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810210487.4A CN108303224B (en) | 2018-03-14 | 2018-03-14 | Food cans air tightness detection equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108303224A CN108303224A (en) | 2018-07-20 |
| CN108303224B true CN108303224B (en) | 2019-08-20 |
Family
ID=62850068
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810210487.4A Active CN108303224B (en) | 2018-03-14 | 2018-03-14 | Food cans air tightness detection equipment |
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| CN (1) | CN108303224B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019205025A1 (en) | 2019-04-08 | 2020-10-08 | Vetter Pharma-Fertigung GmbH & Co. KG | Adapter part for connecting a medical hollow body to a tension / pressure measuring device, test arrangement, method for testing the tightness of a medical hollow body, and use of a tension / pressure measuring device |
| CN110926729B (en) * | 2019-11-29 | 2021-11-19 | 重庆安都陶瓷有限公司 | Tank detection device |
| CN113310644B (en) * | 2021-07-29 | 2021-09-28 | 江苏腾通包装科技有限公司 | Canned food gas tightness detection device |
| CN115183960A (en) * | 2022-09-14 | 2022-10-14 | 泉州海关综合技术服务中心 | Food can gas tightness check out test set |
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| EP0577454A3 (en) * | 1992-06-30 | 1994-06-15 | Remy Equipement | Device for controlling the tightness of vessels closed by an inner capsule |
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| CN206281616U (en) * | 2016-11-16 | 2017-06-27 | 福建明良集团有限公司 | Bamboo shoots tank body air-leakage test head |
| CN207923393U (en) * | 2018-03-14 | 2018-09-28 | 浙江金正检测有限公司 | A kind of air-tightness detection device of food cans |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0577454A3 (en) * | 1992-06-30 | 1994-06-15 | Remy Equipement | Device for controlling the tightness of vessels closed by an inner capsule |
| CN101865765A (en) * | 2010-06-09 | 2010-10-20 | 长春工业大学 | Automatic detection line of liquefied petroleum gas cylinder valve |
| CN205580684U (en) * | 2016-03-22 | 2016-09-14 | 明良有限公司 | Food can gas tightness short -term test equipment |
| CN105606321A (en) * | 2016-03-30 | 2016-05-25 | 王国良 | Automatic leakage detecting device for PE tee joint |
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| CN108303224A (en) | 2018-07-20 |
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