CN210664938U - Aluminum film easily-torn cover leak detection machine - Google Patents
Aluminum film easily-torn cover leak detection machine Download PDFInfo
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- CN210664938U CN210664938U CN201922036842.3U CN201922036842U CN210664938U CN 210664938 U CN210664938 U CN 210664938U CN 201922036842 U CN201922036842 U CN 201922036842U CN 210664938 U CN210664938 U CN 210664938U
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Abstract
The utility model provides an aluminium membrane easily tears lid leak hunting machine, includes that rotating turret and at least one install the detection device on the rotating turret, and detection device includes liftable detecting element and support element, and same detection device's liftable detecting element and support element set up its characterized in that perpendicularly relatively: the lifting detection unit comprises an air cylinder, an elastic positioning seat and a rubber disc seat, the elastic positioning seat is installed on a piston shaft of the air cylinder, the rubber disc seat is installed at the bottom end of the elastic positioning seat, a first air channel is formed in the rubber disc seat, the elastic positioning seat is provided with a second air channel, and the first air channel is connected with an air source through the second air channel; the elastic positioning seat comprises an upper spring seat, a lower spring seat, a spring sleeve and a large spring. Compared with the prior art, the utility model, owing to improved detection device's structure, consequently effectively improved the detection precision, can avoid detection device easily to tear the lid to the aluminium membrane effectively and cause the injury.
Description
Technical Field
The utility model relates to an aluminium membrane easily tears lid leak hunting equipment, more specifically says and relates to a detection precision height, can avoid easily tearing the aluminium membrane to cover the aluminium membrane and cause the aluminium membrane of injury to easily tear lid leak hunting machine effectively.
Background
With the increasing living standard of the public, in order to cater for the constant change of the public in diet and the continuous development of the food industry and the like, breakthrough is sought, and various leisure foods and novel food packaging forms appear in the sight of the public. Tamper-evident films are one of the packaging articles that have become popular in recent years.
In the flexible package industry, the aluminum foil material is widely applied, but the aluminum foil material is not exceptional on the easy-to-tear sealing film, and the aluminum foil easy-to-tear cover is a good easy-to-tear sealing film packaging product of products applied in the market. The aluminum foil easy-to-tear cover completely meets the strict requirements of food packaging, is convenient to use, has very obvious advantages on food packaging, and is a sealing packaging material which is commonly used for packaging various containers.
The application that the aluminium foil easily torn the lid makes food commodity have certain theftproof performance, and the aluminium foil easily tears the humidity resistance and the sealing performance of lid simultaneously is good, and is easy and simple to handle during the packing, consequently all can use the aluminium foil easily to tear the lid on product packages such as beverage bottle, glass bottle, sour teatcup.
Generally, the use advantages of the aluminum foil easy-to-tear cover are mainly reflected in the following aspects:
firstly, the aluminum foil easy-to-tear cover has the characteristics of a common aluminum foil packaging material, is exquisite in appearance and good in printability, and can play a role in publicizing products and improving brand value;
secondly, the aluminum foil easy-to-tear cover generally has high barrier property and good sealing property, protects packaged food in place, can perfectly protect food, and is prevented from being influenced by various adverse factors such as external extrusion, collision and the like;
thirdly, the aluminum foil easy-to-tear cover is tasteless and nontoxic in material, green, environment-friendly, clean and sanitary, and can ensure that the aluminum foil easy-to-tear cover does not pollute packaged food;
fourthly, the production raw material source that the aluminium foil easily torn the lid is wide, compares traditional packing, and manufacturing cost is cheaper.
The aluminium membrane easily tears the lid before using, need detect it, see whether it has the quality problem, and the device that leaks is picked up that adopts at present adopts the cylinder to drive to detect the cover and descends and press and easily tear the lid at the aluminium membrane that waits to detect, then aerify and detect, but detect the cover when pushing down the aluminium membrane and easily tear the lid, in order to possess good leakproofness, pressure is great usually, consequently not only injures the aluminium membrane easily and tears the lid easily, detects the precision of cover and is difficult to improve moreover. That is to say, current leak hunting device exists the structure unreasonable, detects the precision lower, easily tears the lid to the aluminium membrane and causes the injury scheduling problem.
Disclosure of Invention
The utility model aims at providing an aluminium membrane easily tears lid leak hunting machine, this kind of aluminium membrane easily tears lid leak hunting machine and detects the precision height, can avoid easily tearing the lid to the aluminium membrane effectively and cause the injury. The technical scheme is as follows:
the utility model provides an aluminium membrane easily tears lid leak hunting machine, includes that rotating turret and at least one install the detection device on the rotating turret, and detection device includes liftable detecting element and support element, and same detection device's liftable detecting element and support element set up its characterized in that perpendicularly relatively: the lifting detection unit comprises an air cylinder, an elastic positioning seat and a rubber disc seat, the elastic positioning seat is installed on a piston shaft of the air cylinder, the rubber disc seat is installed at the bottom end of the elastic positioning seat, a first air channel is formed in the rubber disc seat, the elastic positioning seat is provided with a second air channel, and the first air channel is connected with an air source through the second air channel; the elastic positioning seat comprises an upper spring seat, a lower spring seat, a spring sleeve and a large spring, a positioning step is arranged on the outer side wall of the top of the upper spring seat, the upper spring seat is provided with a positioning connecting column, the top of the positioning connecting column is connected with a piston shaft of a cylinder, the bottom of the positioning connecting column extends downwards, the spring sleeve is sleeved on the outer side of the upper spring seat, the top of the spring sleeve is suspended on the positioning step of the upper spring seat, the lower spring seat is installed at the bottom of the spring sleeve, the large spring sleeve is arranged on the positioning connecting column in a gap between the positioning connecting column and the spring sleeve, the bottom surface of the positioning. The effect of elastic positioning seat is, avoids the rubber plate seat to descend, compresses tightly the aluminium membrane and easily tears the in-process of lid, easily tears the lid to the aluminium membrane and applys too big power, causes the aluminium membrane and easily tears the lid damage, lets the rubber plate seat easily tear the lid to the aluminium membrane and keeps suitable power to guarantee sealed effect.
According to a better scheme, the rotating frame is provided with the guide post, the elastic positioning seat further comprises a guide seat and a rolling shaft sleeve, the guide seat is arranged at the top of the spring sleeve, the rolling shaft sleeve is arranged on the guide seat, and the rolling shaft sleeve can be sleeved on the guide post along the guide post in a sliding mode. Therefore, the rubber plate base can rise and fall more stably and accurately.
In a preferred scheme, the top surface of the positioning step of the upper spring seat is also provided with a cushion pad. The cushion can reduce the impact force when the spring sleeve contacts with the positioning step of the upper spring seat, and the damage of the spring sleeve and the positioning step due to collision is avoided.
In a more preferable scheme, an annular sealing rubber ring is arranged on the bottom surface of the rubber disc seat. The annular sealing rubber ring compresses the upper surface of the easily-torn cover of the aluminum film to be tested and seals the easily-torn cover.
According to a more preferable scheme, the bottom surface of the rubber disc base is provided with a limiting sleeve, and the limiting sleeve is positioned on the outer side of the annular sealing rubber ring. The stop collar cooperates with the support element who is located the rubber plate seat below, and through its accurate thickness, the annular seal rubber ring of control compresses tightly the aluminium membrane that waits to detect and easily tears the decrement when covering, ensures that can not easily tear the lid to the aluminium membrane and cause the damage among the testing process.
The better scheme, the supporting unit is including setting up constant head tank, protection boss, many little springs on the rotating turret, and protection boss liftable place in the constant head tank, and protection boss bottom surface, constant head tank bottom surface are connected respectively to the both ends of each little spring.
In a more preferable scheme, the top surface of the protection boss is an upward protruding arc surface. The protection boss forms a liftable protection plane which is arched upwards below the aluminum film easy-to-tear cover to be detected, the small spring enables the protection plane to move downwards under the action of force, and the aluminum film easy-to-tear cover to be detected is ensured not to deform under the condition of high-precision detection precision.
More preferably, the supporting unit further comprises a stainless steel top plate, and the stainless steel top plate is mounted on the rotating frame outside the positioning groove.
Preferably, the supporting unit further comprises a positioning magnet, the positioning magnet is mounted on the rotating frame, and the positioning magnet is located between the positioning groove and the stainless steel top plate. The purpose that sets up location magnet is easily torn the lid and is carried to the cylinder below playing accurate positioning action when waiting to detect the aluminium membrane, and annular seal rubber ring is accurate with the position that compresses tightly that waits to detect and easily tear the lid when guaranteeing that the cylinder pushes down.
The better scheme, the rotating turret includes carousel, lower carousel, axis of rotation, actuating mechanism, goes up the carousel, installs respectively in the axis of rotation under the carousel, and actuating mechanism connects the axis of rotation and drives the axis of rotation and rotate, and liftable detecting element installs on last carousel, and the support element is installed under on the carousel. The driving mechanism is a belt driving mechanism consisting of a motor and a synchronous belt.
The better scheme, aluminium membrane easily tears lid leak hunting machine still includes first air supply, first solenoid valve, branch gas seat, pressure sensor, second air supply, second solenoid valve, PLC controller, and second gas channel, branch gas seat, first solenoid valve, first air supply loop through the trachea intercommunication, and second air supply, second solenoid valve, cylinder loop through the trachea intercommunication, and pressure sensor installs on dividing the gas seat, and pressure sensor, first solenoid valve, second solenoid valve are connected with the PLC controller electricity respectively. The pressure sensor detects the gas pressure of the gas distributing seat and outputs a pressure signal, and the PLC receives the pressure signal and respectively outputs a control signal to the first electromagnetic valve and the second electromagnetic valve.
More preferred scheme, detection device is equipped with the sensor that can detect the aluminium membrane and easily tear the lid, and the sensor is connected with the PLC controller electricity.
Compared with the prior art, the utility model, owing to improved detection device's structure, consequently effectively improved the detection precision, can avoid detection device easily to tear the lid to the aluminium membrane effectively and cause the injury.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic view of a partial cross-sectional structure of the detecting unit of embodiment 1 shown in FIG. 1;
FIG. 3 is a schematic view of the use state of the detecting device of embodiment 1 shown in FIG. 1.
Detailed Description
Example 1
As shown in fig. 1-3, the aluminum film easy-to-tear cover leak detector in this embodiment includes a rotating frame 1 and 1 detecting device 2 installed on the rotating frame 1, where the detecting device 2 includes a liftable detecting unit 21 and a supporting unit 22, and the liftable detecting unit 21 and the supporting unit 22 of the same detecting device 2 are vertically arranged relatively.
The rotating frame 1 comprises an upper rotating disc 101, a lower rotating disc 102, a rotating shaft 103 and a driving mechanism 104, wherein the upper rotating disc 101 and the lower rotating disc 102 are respectively installed on the rotating shaft 103, the driving mechanism 104 is connected with the rotating shaft 103 and drives the rotating shaft 103 to rotate, a liftable detection unit 21 is installed on the upper rotating disc 101, and a supporting unit 22 is installed on the lower rotating disc 102. The driving mechanism 104 is a belt driving mechanism composed of a motor and a synchronous belt.
The liftable detection unit 21 is mounted on the upper turntable 101, and the support unit 22 is mounted on the lower turntable 102.
The liftable detection unit 21 comprises an air cylinder 211, an elastic positioning seat 212 and a rubber disc seat 213, wherein the elastic positioning seat 212 is installed on a piston shaft of the air cylinder 211, the rubber disc seat 213 is installed at the bottom end of the elastic positioning seat 212, the rubber disc seat 213 is provided with a first air channel 2131, the elastic positioning seat 212 is provided with a second air channel 2121, and the first air channel 2131 is connected with an air source through the second air channel 2121.
The elastic positioning seat 212 includes an upper spring seat 2128, a lower spring seat 2122, a spring sleeve 2123, and a large spring 2124, a positioning step 21281 is disposed on an outer side wall of a top of the upper spring seat 2128, the upper spring seat 2128 has a positioning connection post 21282, a top of the positioning connection post 21282 is connected to a piston shaft of the cylinder 211 (the two are connected by a screw thread), a bottom of the positioning connection post 21282 extends downward, the spring sleeve 2123 is sleeved on an outer side of the upper spring seat 2128, a top end of the spring sleeve 2123 is suspended on the positioning step 21281 of the upper spring seat 2128, the lower spring seat 2122 is mounted at a bottom of the spring sleeve 2123 (the two are connected by a screw thread), the large spring 2124 is sleeved on the positioning connection post 21282, the large spring 2124 is located in a gap between the positioning connection post 21282 and the. The effect of elastic positioning seat 212 is, avoids the in-process that rubber disc seat 213 descends, compresses tightly the aluminium membrane and easily tears the lid, easily tears the lid to the aluminium membrane and applys too big power, causes the aluminium membrane to easily tear the lid damage, lets rubber disc seat 213 easily tear the lid to the aluminium membrane and keeps suitable power to guarantee sealed effect.
A cushion 2125 is further provided on the top surface of the positioning step 21281 of the upper spring seat 2128. The cushion 2125 can reduce the impact force when the spring sleeve 2123 contacts the positioning step 21281 of the upper spring seat 2128, and prevent the spring sleeve 2123 and the upper spring seat 2128 from being damaged by collision.
The rotating frame 1 is provided with a guide post 105, the elastic positioning seat 212 further comprises a guide seat 2126 and a rolling shaft sleeve 2127, the guide seat 2126 is installed at the top of the spring sleeve 2123, the rolling shaft sleeve 2127 is installed on the guide seat 2126, and the rolling shaft sleeve 2127 can be slidably sleeved on the guide post 105 along the guide post 105. Therefore, the rubber disc seat 213 can be lifted more stably and accurately.
An annular sealing rubber ring 2133 is arranged on the bottom surface of the rubber disc seat 213. The annular sealing rubber ring 2133 compresses the upper surface of the easily torn cover of the aluminum film to be tested and seals the easily torn cover.
The bottom surface of the rubber disc seat 213 is provided with a limiting sleeve 2132, and the limiting sleeve 2132 is positioned outside the annular sealing rubber ring 2133. The stop collar 2132 cooperates with the support unit 22 that is located the rubber disc seat 213 below, and through its accurate thickness, the annular seal rubber ring 2133 is controlled and is compressed tightly the aluminium membrane that waits to detect and the amount of compression when easily tearing the lid, ensures that can not easily tear the lid to the aluminium membrane and cause the damage in the testing process.
The supporting unit 22 includes a positioning groove 221, a protection boss 222, and a plurality of small springs 223 disposed on the top surface of the lower turntable 102 of the rotating turret 1, the protection boss 222 is disposed in the positioning groove 221 in a liftable manner, and two ends of each small spring 223 are respectively connected to the bottom surface of the protection boss 222 and the bottom surface of the positioning groove 221.
The top surface of the protection boss 222 is an arc surface protruding upwards. The protection boss 222 forms a lifting protection plane which is arched upwards below the to-be-detected aluminum film easy-to-tear cover, the small spring 223 enables the protection plane to move downwards under the action of force, and the aluminum film easy-to-tear cover to be detected is guaranteed not to deform under the condition of high-precision detection precision.
The supporting unit 22 further includes a stainless steel top plate 224, and the stainless steel top plate 224 is mounted on the rotating frame 1 outside the positioning groove 221.
The support unit 22 further includes a positioning magnet 225 (the positioning magnet 225 is in a ring shape and is disposed around the outer edge of the positioning groove 221), the positioning magnet 225 is mounted on the rotating frame 1 and the positioning magnet 225 is located between the positioning groove 221 and the stainless steel top plate 224. The purpose of setting up positioning magnet 225 is to play accurate positioning action when waiting that the aluminium membrane that detects easily tears the lid and carry to cylinder 211 below, and annular sealing rubber ring 2133 is accurate with the position that compresses tightly that waits to detect easily to tear the lid when guaranteeing that cylinder 211 pushes down.
The aluminum film easy-to-tear cover leak detector further comprises a first air source 3, a first electromagnetic valve 4, a gas distribution seat 5, a pressure sensor 6, a second air source 7, a second electromagnetic valve 8 and a PLC (programmable logic controller) 9, a second gas channel 2121, the gas distribution seat 5, the first electromagnetic valve 4 and the first air source 3 are communicated through a gas pipe in sequence, the second air source 7, the second electromagnetic valve 8 and the cylinder 211 are communicated through the gas pipe in sequence, the pressure sensor 6 is installed on the gas distribution seat 5, and the pressure sensor 6, the first electromagnetic valve 4 and the second electromagnetic valve 8 are respectively electrically connected with the PLC 9. The pressure sensor 6 detects the gas pressure of the gas distributing base 5 and outputs a pressure signal, and the PLC 9 receives the pressure signal and respectively outputs a control signal to the first electromagnetic valve 4 and the second electromagnetic valve 8. Therefore, in this example, the first gas passage 2131 is connected to the gas source through the second gas passage 2121, which means that the first gas passage 2131, the second gas passage 2121, the gas distributor 5, the first solenoid valve 4 and the first gas source 3 are sequentially communicated.
The detection device 2 is provided with a sensor (not shown in figures 1-3) which can detect the easily torn cover of the aluminum film, and the sensor is electrically connected with the PLC 9.
The following operation is described with reference to fig. 1-3:
the driving mechanism 104 drives the rotating shaft 103 to rotate, and the upper turntable 101 and the lower turntable 102 rotate along with the rotating shaft 103.
The detection processes of the detection device 2 are all synchronously performed in the rotation process of the rotating frame 1:
the aluminum film easy-to-tear cover 10 to be detected is conveyed to the lower turntable 102 through the front end conveying assembly, when the sensor detects that the aluminum film easy-to-tear cover 10 to be detected is about to enter the position below the air cylinder 211, the PLC 9 sends a signal to the second electromagnetic valve 8, a valve core of the second electromagnetic valve 8 is controlled to change the position after a set time, and the air cylinder 211 is controlled to move downwards to press the aluminum film easy-to-tear cover 10 to be detected right below; after the pressing, the PLC 9 sends another signal to the first electromagnetic valve 4, the first electromagnetic valve 4 is opened, and the gas in the first gas source 3 is filled into a sealing cavity formed by the annular sealing rubber ring 2133 and the aluminum film easy-to-tear cover 10; after the filling is finished, the first electromagnetic valve 4 is closed, the passage between the first air source 3 and the sealed cavity is cut off, at the moment, the pressure sensor 6 records the air pressure in the sealed cavity for the first time, and the PLC 9 stores the pressure value; when the aluminum film easy-to-tear cover 10 rotates to be close to an outlet, the pressure sensor 6 records the gas pressure in the sealed cavity for the second time, the PCL controller stores the value at the moment and compares the value with the value recorded for the first time, if the difference value of the two values is larger than a preset judgment value, the PCL controller judges the aluminum film easy-to-tear cover 10 as unqualified, and rejects the aluminum film easy-to-tear cover after being sent out; if the difference value of the two values is smaller than a preset judgment value, the PCL controller judges the aluminum film easy-to-tear cover 10 to be qualified and enters the next process. Through the experiment, the detection precision of this equipment can reach 0.03mm (namely when the aluminium membrane easily tears lid 10 that awaits measuring to have the diameter to be more than or equal to 0.03 mm's hole, equipment can all detect it).
Example 2
The aluminum film easy-to-tear cover leak detector in the embodiment is different from the aluminum film easy-to-tear cover leak detector in the embodiment 1 in that:
the number of detection devices 2 is 8.
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and all the equivalent or simple changes made according to the structure, the features and the principle of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides an aluminium membrane easily tears lid leak hunting machine, includes that rotating turret and at least one install the detection device on the rotating turret, and detection device includes liftable detecting element and support element, and same detection device's liftable detecting element and support element set up its characterized in that perpendicularly relatively: the lifting detection unit comprises an air cylinder, an elastic positioning seat and a rubber disc seat, the elastic positioning seat is installed on a piston shaft of the air cylinder, the rubber disc seat is installed at the bottom end of the elastic positioning seat, a first air channel is formed in the rubber disc seat, the elastic positioning seat is provided with a second air channel, and the first air channel is connected with an air source through the second air channel; the elastic positioning seat comprises an upper spring seat, a lower spring seat, a spring sleeve and a large spring, a positioning step is arranged on the outer side wall of the top of the upper spring seat, the upper spring seat is provided with a positioning connecting column, the top of the positioning connecting column is connected with a piston shaft of a cylinder, the bottom of the positioning connecting column extends downwards, the spring sleeve is sleeved on the outer side of the upper spring seat, the top of the spring sleeve is suspended on the positioning step of the upper spring seat, the lower spring seat is installed at the bottom of the spring sleeve, the large spring sleeve is arranged on the positioning connecting column in a gap between the positioning connecting column and the spring sleeve, the bottom surface of the positioning.
2. The aluminum film easy-to-tear cover leak detector as defined in claim 1, wherein: the rotating frame is provided with a guide post, the elastic positioning seat further comprises a guide seat and a rolling shaft sleeve, the guide seat is arranged at the top of the spring sleeve, the rolling shaft sleeve is arranged on the guide seat, and the rolling shaft sleeve can be sleeved on the guide post along the guide post in a sliding manner.
3. The aluminum film easy-to-tear cover leak detector as defined in claim 1, wherein: and a cushion pad is also arranged on the top surface of the positioning step of the upper spring seat.
4. The aluminum film easy-to-tear cover leak detector as defined in claim 1, wherein: and an annular sealing rubber ring is arranged on the bottom surface of the rubber disc seat.
5. The aluminum film easy-to-tear cover leak detector as defined in claim 4, wherein: and the bottom surface of the rubber disc seat is provided with a limiting sleeve, and the limiting sleeve is positioned on the outer side of the annular sealing rubber ring.
6. The aluminum film easy-to-tear cover leak detector as claimed in any one of claims 1 to 5, wherein: the supporting unit comprises a positioning groove, a protection boss and a plurality of small springs, the positioning groove, the protection boss and the plurality of small springs are arranged on the rotating frame, the protection boss is arranged in the positioning groove in a lifting mode, and the bottom surface of the protection boss and the bottom surface of the positioning groove are connected to the two ends of each small spring respectively.
7. The aluminum film easy-to-tear cover leak detector as defined in claim 6, wherein: the top surface of the protection boss is an upward protruding arc surface.
8. The aluminum film easy-to-tear cover leak detector as defined in claim 6, wherein: the supporting unit further comprises a stainless steel top plate, and the stainless steel top plate is installed on the rotating frame outside the positioning groove.
9. The aluminum film easy-to-tear cover leak detector as defined in claim 1, wherein: the rotating frame comprises an upper rotating disc, a lower rotating disc, a rotating shaft and a driving mechanism, the upper rotating disc and the lower rotating disc are respectively installed on the rotating shaft, the driving mechanism is connected with the rotating shaft and drives the rotating shaft to rotate, the lifting detection unit is installed on the upper rotating disc, and the supporting unit is installed on the lower rotating disc.
10. The aluminum film easy-to-tear cover leak detector as defined in claim 1, wherein: the aluminum film easy-to-tear cover leak detector further comprises a first gas source, a first electromagnetic valve, a gas distribution seat, a pressure sensor, a second gas source, a second electromagnetic valve and a PLC (programmable logic controller), wherein a second gas channel, the gas distribution seat, the first electromagnetic valve and the first gas source are communicated sequentially through a gas pipe, the second gas source, the second electromagnetic valve and a cylinder are communicated sequentially through the gas pipe, the pressure sensor is installed on the gas distribution seat, and the pressure sensor, the first electromagnetic valve and the second electromagnetic valve are electrically connected with the PLC respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922036842.3U CN210664938U (en) | 2019-11-22 | 2019-11-22 | Aluminum film easily-torn cover leak detection machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922036842.3U CN210664938U (en) | 2019-11-22 | 2019-11-22 | Aluminum film easily-torn cover leak detection machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210664938U true CN210664938U (en) | 2020-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922036842.3U Active CN210664938U (en) | 2019-11-22 | 2019-11-22 | Aluminum film easily-torn cover leak detection machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210664938U (en) |
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2019
- 2019-11-22 CN CN201922036842.3U patent/CN210664938U/en active Active
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