CN112161056A - Multilayer binding container, preparation method thereof and leak point positioning and connectivity detection method - Google Patents
Multilayer binding container, preparation method thereof and leak point positioning and connectivity detection method Download PDFInfo
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- CN112161056A CN112161056A CN202011062501.4A CN202011062501A CN112161056A CN 112161056 A CN112161056 A CN 112161056A CN 202011062501 A CN202011062501 A CN 202011062501A CN 112161056 A CN112161056 A CN 112161056A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J12/00—Pressure vessels in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
- B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/0076—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised in that the layers are not bonded on the totality of their surfaces
- B32B37/0084—Point bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/08—Interconnection of layers by mechanical means
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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
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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
- G01M3/3236—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
Abstract
The invention discloses a multilayer binding container and a preparation method thereof, and a leak location and connectivity detection method, wherein the multilayer binding container comprises an inner cylinder, a plurality of layers of laminates, an upper end enclosure and a lower end enclosure, wherein each layer of laminate is sequentially stacked and bound on the outer wall of the inner cylinder after being bent, and a closed air gap cavity is formed between the first layer of laminate in the plurality of layers of laminates and the outer wall of the inner cylinder; the upper and lower end enclosures are respectively provided with an upper and a lower air passages communicated with the air gap cavity; one sealing connection in upper airway and the lower air flue has atmospheric pressure induction system, and another in upper airway and the lower air flue is then sealed through the sealing member, perhaps upper and lower air flue equal sealing connection has atmospheric pressure induction system to make atmospheric pressure induction system can respond to the atmospheric pressure change in the air gap chamber. The invention can quickly respond to the leakage of the inner cylinder through the change of air pressure; compressed air is introduced into the air gap cavity, and the leakage point of the inner cylinder can be located in an express way by combining the position where the air bubbles are generated. The preparation method is simple, convenient and ingenious, and the air gap cavity can be naturally formed by utilizing the characteristics of shape error and rough surface.
Description
Technical Field
The invention relates to the technical field of multilayer binding containers, in particular to a leak detection structure and method for a multilayer binding container.
Background
The multilayer wrapping type high-pressure container comprises an inner cylinder, and referring to fig. 1, a layer-by-layer wrapping layer plate 2a is arranged outside the inner cylinder 1 a. In the existing manufacturing process, each layer of laminate is provided with an exhaust hole 3a, the arrangement of the exhaust holes of the laminate 2a is irregular, and the exhaust function is mainly realized in the binding process to exhaust air between layers. Although the exhaust hole can also play the function of certain signal hole (accessible exhaust hole outwards transmits when inside inner tube has the leakage layer upon layer, and shows), because the path is long, internal resistance is big, when inside has the leakage, often will show in the outside very long time, does not play the timely protection to inside inner tube, especially in chemical industry medium, in the gap between the plywood was revealed to the medium, the danger of taking place the corruption is very big. And even if the leakage is found in the inner part, the leakage point in the inner part cannot be quickly checked.
Disclosure of Invention
Aiming at the defects of the technology, the invention provides a multilayer binding container which can quickly respond to the leakage of an inner cylinder and can quickly position the leakage point.
In order to solve the technical problem, the invention provides a technical scheme as follows: a multilayer binding container comprises an inner cylinder, a plurality of layers of laminates, an upper end enclosure and a lower end enclosure, wherein each layer of laminate is sequentially stacked and bound on the outer wall of the inner cylinder after being bent, and a closed air gap cavity is formed between the first layer of laminate in the plurality of layers of laminates and the outer wall of the inner cylinder; the upper end enclosure and the lower end enclosure are respectively provided with an upper air passage and a lower air passage which are communicated with the air gap cavity; one of the upper air passage and the lower air passage is hermetically connected with an air pressure sensing device, the other of the upper air passage and the lower air passage is sealed through a sealing piece, or the upper air passage and the lower air passage are both hermetically connected with the air pressure sensing device, so that the air pressure sensing device can sense the air pressure change in the air gap cavity.
Furthermore, the first layer of laminate is formed by welding a plurality of sub-laminates; in the vertical direction, adjacent sub-layer plates are connected through a circumferential weld; in the horizontal direction, two ends of a single sub-layer plate are connected through a longitudinal welding line; embedding a gas guide block at the joint of the longitudinal welding seam and the circumferential welding seam; and each sub-air gap cavity is formed between each sub-layer plate and the outer wall of the inner cylinder, and the adjacent upper and lower sub-air gap cavities are communicated through the air guide grooves on the air guide blocks on the corresponding circumferential weld joints, so that each sub-air gap cavity is communicated to form the air gap cavity.
Furthermore, the first layer of laminate is formed by welding a plurality of sub-laminates; in the vertical direction, adjacent sub-layer plates are connected through a circumferential weld; in the horizontal direction, adjacent sub-layer plates are connected through longitudinal welding seams; embedding a gas guide block at the joint of the longitudinal welding seam and the circumferential welding seam; and each sub-air gap cavity is formed between each sub-layer plate and the outer wall of the inner cylinder, the adjacent upper and lower sub-air gap cavities are communicated through the air guide grooves on the air guide blocks on the corresponding circumferential weld, and the adjacent left and right sub-air gap cavities are communicated through the air guide grooves on the air guide blocks, so that the sub-air gap cavities are communicated to form the air gap cavity.
Further, the air guide groove is an H-shaped groove arranged on the inner surface of the air guide block; the H-shaped groove comprises vertical grooves which are respectively positioned on two sides of the longitudinal welding line and penetrate through the air guide blocks, and the two vertical grooves are communicated through a transverse groove.
Furthermore, the longitudinal welding seams of the adjacent upper and lower sub-laminates are staggered.
The invention also provides a preparation method of the multilayer binding container, which comprises the following steps:
preprocessing a sub-layer plate: a transverse through groove is formed in the inner surface of the sub-layer plate close to the lower edge, and vertical grooves communicated with the transverse through groove and the lower edge of the sub-layer plate are respectively formed below two ends of the transverse through groove;
each sub-laminated board is wrapped on the outer wall of the inner cylinder after being bent, and each sub-air gap cavity can be naturally formed due to shape error and rough surface; in the horizontal direction, the adjacent left sub-laminates and the right sub-laminates are welded in a sealing way to form longitudinal welding seams; welding an air guide block at the lower end of the longitudinal welding line, and communicating an air guide groove on the air guide block with the vertical groove; after the sub-layer plate is bent, a pointed arch is formed near the longitudinal weld joint, and the pointed arch is naturally communicated with the transverse through groove, so that gas in the sub-air gap cavity can be collected to the pointed arch and then sequentially enters the gas guide groove on the gas guide block through the transverse through groove and the vertical groove;
in the vertical direction, the longitudinal welding seams of the adjacent upper sub-layer plate and the adjacent lower sub-layer plate are staggered with each other, and the staggered distance of the longitudinal welding seams of the adjacent upper sub-layer plate and the adjacent lower sub-layer plate is basically equal to the distance from the pointed arch to the longitudinal welding seam; the adjacent upper sub-layer plate and the lower sub-layer plate are hermetically welded to form a circumferential weld, and the end of the circumferential weld is welded on the air guide block; the sub air gap cavities can be communicated through the air guide block to form the air gap cavity;
the upper end and the lower end of the inner cylinder are respectively welded with an upper seal head and a lower seal head through seal head circumferential welds 5, and an upper air passage and a lower air passage are respectively arranged in the upper seal head and the lower seal head; the upper end enclosure and the lower end enclosure are respectively welded with the upper end and the lower end of the first layer laminate, and after the welding of the upper end enclosure and the lower end enclosure is finished, corresponding air pressure induction devices are installed to seal an air gap cavity between the first layer laminate and the outer wall of the inner cylinder; and the upper air passage and the lower air passage in the upper end socket and the lower end socket are respectively communicated with the air gap cavity through corresponding air guide blocks.
The invention also provides a method for quickly positioning the leakage point of the multilayer binding container, which is characterized by comprising the following steps of:
the air pressure change in the air gap cavity is reflected through an air pressure sensing device, and if the pressure increase exceeds a threshold value, the inner cylinder is indicated to be leaked;
when the inner barrel is detected to leak, emptying the contents in the inner barrel; then, keeping one of the upper air passage or the lower air passage sealed, and filling compressed air into the air gap cavity from the other air passage or the lower air passage;
and spraying liquid capable of forming bubbles after inflation, and observing the position where the bubbles are generated on the surface of the inner cylinder, wherein the position where the bubbles are generated is the position of a leakage point.
The invention also provides a connectivity detection method of the multilayer binding container, which is characterized by comprising the following steps: and simultaneously opening the upper airway and the lower airway, introducing gas from any one of the upper airway or the lower airway, and judging the connectivity of the air gap cavity by detecting whether the gas flows out from the other one.
Compared with the prior art, the invention has the advantages that:
1. the multilayer binding container disclosed by the invention utilizes the air pressure change in the air gap cavity between the first layer plate (without the vent hole) and the outer wall of the inner barrel to react leakage, when the inner barrel leaks, the leakage flows into the air gap cavity to cause the air in the air gap cavity to be compressed, so that the air pressure is increased, and the inner barrel leakage condition can be quickly reflected by monitoring the air pressure. However, in the prior art, the leakage object flows to the outside through the layer of exhaust holes to reflect the leakage condition of the inner cylinder, once the leakage object leaks from the inner cylinder, the leakage can be quickly responded at the first time, and the leakage object does not need to pass through the layer of exhaust holes, so that the response speed is greatly improved.
2. The first layer of laminate is formed by welding a plurality of sub-laminates, and can adapt to large and medium-sized multilayer binding containers. Meanwhile, the invention is correspondingly improved in structure, namely, the air guide block is added to ensure that all the sub-air gap cavities can be communicated to form the air gap cavity.
3. The gas guide block is arranged at the joint of the longitudinal welding line and the circumferential welding line, and the gap between the pointed arch and the outer wall of the inner barrel is larger because the pointed arch formed by bending the sub-layer plate is arranged near the longitudinal welding line, so that the gas can be collected, the gas can quickly reach the gas guide block, and the response speed is further improved.
4. The air guide groove is an H-shaped groove, so that adjacent sub air gap cavities in the horizontal direction and the vertical direction are communicated with each other. The longitudinal welding lines of the adjacent upper and lower sub-laminates are staggered, so that the wrapping strength can be increased.
5. The preparation method is simple, convenient and ingenious, the air gap cavity can be naturally formed by utilizing the characteristics of shape error and rough surface, and the vertical gas collecting channel can be formed by utilizing the naturally formed pointed arch after bending, so that the gas circulation is accelerated. And the transverse through grooves and the vertical grooves on the sub-layer plate further collect gas, so that the gas circulation is further improved, and the response speed is accelerated.
6. The invention can position the leakage point of the inner cylinder in an express way by introducing compressed air into the air gap cavity and combining the position of bubble generation, which is incomparable with the multilayer binding container in the prior art.
Drawings
Figure 1 is a schematic diagram of the construction of a prior art multi-layered packaging container;
figure 2 is a schematic diagram of the internal structure of a multi-layered packaging container in this embodiment;
FIG. 3 is a schematic diagram of the preparation of a multi-layered packaging container in accordance with this embodiment;
FIG. 4 is a schematic cross-sectional view of a sub-laminate in this embodiment;
figure 5 is a schematic diagram of the configuration of a multi-layered packaging container according to this embodiment;
FIG. 6 is a schematic structural view of an air guide block in the present embodiment;
FIG. 7 is an enlarged partial view of the intersection of the longitudinal and circumferential welds of this embodiment;
figure 8 is a gas flow scheme for a multi-layered packing container according to this embodiment.
Detailed Description
Referring to fig. 2 and 5, the multilayer binding container comprises an inner cylinder 1, a plurality of layers of laminates, an upper seal head 3 and a lower seal head 4, wherein the laminates are bent and then sequentially stacked and bound on the outer wall of the inner cylinder 1, and a closed air gap cavity 102 is formed between a first layer of laminate 2 in the plurality of layers of laminates and the outer wall of the inner cylinder 1; an upper air passage 301 and a lower air passage 401 which are communicated with the air gap cavity 102 are respectively arranged in the upper sealing head 3 and the lower sealing head 4; one of the upper air passage 301 and the lower air passage 401 is hermetically connected with an air pressure sensing device, and the other of the upper air passage 301 and the lower air passage 401 is sealed by a sealing member, or both the upper air passage 301 and the lower air passage 401 are hermetically connected with the air pressure sensing device, so that the air pressure sensing device can sense the air pressure change in the air gap cavity 102. The air pressure sensing device is a low pressure air meter or a pressure transmitter.
The multilayer wrapping container utilizes the air pressure change in the air gap cavity 102 between the first layer of laminate 2 (without vent holes) and the outer wall of the inner barrel to react leakage, when the inner barrel 1 leaks, the leaked material flows into the air gap cavity 102 to cause the air in the air gap cavity 102 to be compressed, so that the air pressure is increased, and the leakage condition of the inner barrel 1 can be quickly reflected by monitoring the air pressure. However, in the prior art, the leakage object can reflect the leakage condition of the inner cylinder 1 only by flowing to the outside through the layer-by-layer exhaust holes, once the leakage object leaks from the inner cylinder 1, the leakage can be quickly responded at the first time, and the leakage object does not need to pass through the layer-by-layer exhaust holes, so that the response speed is greatly improved.
When the container is comparatively thin and high, need splice in vertical direction: the first layer plate 2 is formed by welding a plurality of sub-layer plates; in the vertical direction, adjacent sub-layer plates are connected through a circumferential weld, and longitudinal welds of adjacent upper and lower sub-layer plates are staggered; in the horizontal direction, two ends of a single sub-layer plate are connected through a longitudinal welding line; embedding a gas guide block at the joint of the longitudinal welding seam and the circumferential welding seam; each sub-air gap cavity 102 is formed between each sub-layer plate and the outer wall of the inner cylinder, and the adjacent upper and lower sub-air gap cavities 102 are communicated through air guide grooves on air guide blocks on corresponding circumferential weld seams, so that each sub-air gap cavity 102 is communicated to form the air gap cavity 102; the air guide groove is a groove which is arranged on the inner surface of the air guide block and vertically penetrates through the air guide block, and the inner surface of the air guide block refers to one surface, opposite to the outer wall of the inner cylinder, of the air guide block.
Referring to fig. 3 and 6, when the container is thick and tall, splicing is required in both the vertical and horizontal directions: the first layer plate 2 is formed by welding a plurality of sub-layer plates 201; in the vertical direction, the adjacent sub-layer plates 201 are connected through a circumferential weld 6, and longitudinal welds 8 of the adjacent upper sub-layer plate 201 and the adjacent lower sub-layer plate 201 are staggered; in the horizontal direction, adjacent sub-layer plates 201 are connected by longitudinal welds 8; embedding a gas guide block 7 at the joint of the longitudinal welding seam 8 and the circumferential welding seam 6; each sub-layer plate 201 and the outer wall of the inner cylinder form each sub-air gap cavity 102, adjacent upper and lower sub-air gap cavities 102 are communicated through an air guide groove 701 on an air guide block 7 on a corresponding circumferential weld 6, and adjacent left and right sub-air gap cavities 102 are communicated together through the air guide groove on the air guide block 7, so that each sub-air gap cavity 102 is communicated to form the air gap cavity 102. Referring to fig. 7, the air guide groove 701 is an H-shaped groove provided on the inner surface of the air guide block 7; the H-shaped groove comprises vertical grooves which are respectively positioned on two sides of the longitudinal welding line 8 and penetrate through the air guide blocks 7, and the two vertical grooves are communicated through a transverse groove.
The method of making a multi-layered wrapping container in this embodiment comprises the steps of:
referring to fig. 3 and 4, the sub-ply pretreatment: a transverse through groove 2011 is formed in the inner surface of the sub-layer board 201 close to the lower edge, and vertical grooves 2012 for communicating the transverse through groove 2011 with the lower edge of the sub-layer board 201 are respectively formed below two ends of the transverse through groove 2011;
each sub-layer plate 201 is wrapped on the outer wall of the inner cylinder after being bent, and each sub-air gap cavity 102 can be naturally formed due to shape error and rough surface; in the horizontal direction, a longitudinal welding seam 8 is formed between the adjacent left sub-layer plate 201 and the adjacent right sub-layer plate 201 in a sealing welding mode; welding an air guide block 7 at the lower end of the longitudinal welding line 8, and communicating an air guide groove on the air guide block 7 with the vertical groove 2012; after being bent, the sub-layer plate 201 forms a pointed arch near the longitudinal weld 8, and the pointed arch is naturally communicated with the transverse through groove 2011, so that gas in the sub-air gap cavity 102 can be collected to the pointed arch and then enters the air guide groove on the air guide block 7 through the transverse through groove 2011 and the vertical groove 2012 in sequence;
in the vertical direction, the longitudinal welding seams 8 of the adjacent upper sub-layer plate 201 and the adjacent lower sub-layer plate 201 are staggered, and the staggered distance of the longitudinal welding seams 8 of the adjacent upper sub-layer plate 201 and the adjacent lower sub-layer plate 201 is basically equal to the distance from the pointed arch to the longitudinal welding seams 8; the adjacent upper sublayer plate 201 and the lower sublayer plate 201 are hermetically welded to form a circumferential weld 6, and the end of the circumferential weld 6 is welded on the air guide block 7; the sub-air gap cavities 102 can be communicated through the air guide block 7 to form the air gap cavity 102;
referring to fig. 2, an upper end enclosure 3 and a lower end enclosure 4 are welded at the upper end and the lower end of an inner cylinder 1 through an end enclosure circumferential weld 5, and an upper air passage 301 and a lower air passage 401 are arranged in the upper end enclosure 3 and the lower end enclosure 4 respectively; the upper end enclosure 3 and the lower end enclosure 4 are respectively welded with the upper end and the lower end of the first layer laminate, and after the welding of the upper end enclosure 3 and the lower end enclosure 4 is finished, corresponding air pressure induction devices are installed, so that an air gap cavity 102 between the first layer laminate 2 and the outer wall of the inner cylinder is sealed; the upper air passage 301 and the lower air passage 401 in the upper end socket 3 and the lower end socket 4 are respectively communicated with the air gap cavity 102 through corresponding air guide blocks 7.
Referring to fig. 8, after the multi-layered packaging container is prepared, connectivity check is performed as follows: and simultaneously opening the upper air passage 301 and the lower air passage 401, introducing gas from either the upper air passage 301 or the lower air passage 401, and judging the connectivity of the air gap cavity 102 by detecting whether the gas flows out from the other air passage.
During the use process of the multi-layer packing container, the air pressure change in the air gap cavity 102 is reflected through the air pressure sensing device, and if the pressure increase exceeds a threshold value, the leakage of the inner barrel 1 is indicated. When the inner barrel 1 is detected to leak, emptying the contents in the inner barrel 1; then, either one of the upper airway 301 or the lower airway 401 is kept sealed, and compressed air is filled into the air gap cavity 102 from the other; spraying liquid capable of forming bubbles after aeration, and observing the position of the bubbles generated on the surface of the inner barrel 1, wherein the position of the bubbles generated is the position of a leakage point.
Claims (10)
1. The utility model provides a container is wrapped to multilayer, includes inner tube, multilayer plywood and upper and lower head, stacks gradually after each layer plywood is crooked and wraps on the inner tube outer wall, its characterized in that: a closed air gap cavity is formed between the first layer laminate and the outer wall of the inner cylinder; the upper end enclosure and the lower end enclosure are respectively provided with an upper air passage and a lower air passage which are communicated with the air gap cavity; one of the upper air passage and the lower air passage is hermetically connected with an air pressure sensing device, the other of the upper air passage and the lower air passage is sealed through a sealing piece, or the upper air passage and the lower air passage are both hermetically connected with the air pressure sensing device, so that the air pressure sensing device can sense the air pressure change in the air gap cavity.
2. A multi-layered packing container according to claim 1 wherein: the first layer plate is formed by welding a plurality of sub-layer plates; in the vertical direction, adjacent sub-layer plates are connected through a circumferential weld; in the horizontal direction, two ends of a single sub-layer plate are connected through a longitudinal welding line; embedding a gas guide block at the joint of the longitudinal welding seam and the circumferential welding seam; and each sub-air gap cavity is formed between each sub-layer plate and the outer wall of the inner cylinder, and the adjacent upper and lower sub-air gap cavities are communicated through the air guide grooves on the air guide blocks on the corresponding circumferential weld joints, so that each sub-air gap cavity is communicated to form the air gap cavity.
3. A multi-layered packing container according to claim 2 wherein: the air guide groove is a groove which is arranged on the inner surface of the air guide block and vertically penetrates through the air guide block, and the inner surface of the air guide block refers to one surface, opposite to the outer wall of the inner cylinder, of the air guide block.
4. A multi-layered packing container according to claim 1 wherein: the first layer plate is formed by welding a plurality of sub-layer plates; in the vertical direction, adjacent sub-layer plates are connected through a circumferential weld; in the horizontal direction, adjacent sub-layer plates are connected through longitudinal welding seams; embedding a gas guide block at the joint of the longitudinal welding seam and the circumferential welding seam; and each sub-air gap cavity is formed between each sub-layer plate and the outer wall of the inner cylinder, the adjacent upper and lower sub-air gap cavities are communicated through the air guide grooves on the air guide blocks on the corresponding circumferential weld, and the adjacent left and right sub-air gap cavities are communicated through the air guide grooves on the air guide blocks, so that the sub-air gap cavities are communicated to form the air gap cavity.
5. A multi-layered packing container according to claim 4 wherein: the air guide groove is an H-shaped groove arranged on the inner surface of the air guide block; the H-shaped groove comprises vertical grooves which are respectively positioned on two sides of the longitudinal welding line and penetrate through the air guide blocks, and the two vertical grooves are communicated through a transverse groove.
6. A multi-layered packing container according to claim 2 or claim 4 wherein: the longitudinal welding seams of the adjacent upper sub-laminate and the lower sub-laminate are staggered.
7. A multi-layered packing container according to claim 1 wherein: the air pressure sensing device is a low pressure air meter or a pressure transmitter.
8. A method of preparing a multi-layered packing container as claimed in claim 2 or claim 4, comprising the steps of:
preprocessing a sub-layer plate: a transverse through groove is formed in the inner surface of the sub-layer plate close to the lower edge, and vertical grooves communicated with the transverse through groove and the lower edge of the sub-layer plate are respectively formed below two ends of the transverse through groove;
each sub-laminated board is wrapped on the outer wall of the inner cylinder after being bent, and each sub-air gap cavity can be naturally formed due to shape error and rough surface; in the horizontal direction, the adjacent left sub-laminates and the right sub-laminates are welded in a sealing way to form longitudinal welding seams; welding an air guide block at the lower end of the longitudinal welding line, and communicating an air guide groove on the air guide block with the vertical groove; after the sub-layer plate is bent, a pointed arch is formed near the longitudinal weld joint, and the pointed arch is naturally communicated with the transverse through groove, so that gas in the sub-air gap cavity can be collected to the pointed arch and then sequentially enters the gas guide groove on the gas guide block through the transverse through groove and the vertical groove;
in the vertical direction, the longitudinal welding seams of the adjacent upper sub-layer plate and the adjacent lower sub-layer plate are staggered with each other, and the staggered distance of the longitudinal welding seams of the adjacent upper sub-layer plate and the adjacent lower sub-layer plate is basically equal to the distance from the pointed arch to the longitudinal welding seam; the adjacent upper sub-layer plate and the lower sub-layer plate are hermetically welded to form a circumferential weld, and the end of the circumferential weld is welded on the air guide block; the sub air gap cavities can be communicated through the air guide block to form the air gap cavity;
the upper end and the lower end of the inner cylinder are respectively welded with an upper seal head and a lower seal head through seal head circumferential welds 5, and an upper air passage and a lower air passage are respectively arranged in the upper seal head and the lower seal head; the upper end enclosure and the lower end enclosure are respectively welded with the upper end and the lower end of the first layer laminate, and after the welding of the upper end enclosure and the lower end enclosure is finished, corresponding air pressure induction devices are installed to seal an air gap cavity between the first layer laminate and the outer wall of the inner cylinder; and the upper air passage and the lower air passage in the upper end socket and the lower end socket are respectively communicated with the air gap cavity through corresponding air guide blocks.
9. A method of rapidly locating a leak in a multi-layered packing container as claimed in claim 1, comprising the steps of:
the air pressure change in the air gap cavity is reflected through an air pressure sensing device, and if the pressure increase exceeds a threshold value, the inner cylinder is indicated to be leaked;
when the inner barrel is detected to leak, emptying the contents in the inner barrel; then, keeping one of the upper air passage or the lower air passage sealed, and filling compressed air into the air gap cavity from the other air passage or the lower air passage;
and spraying liquid capable of forming bubbles after inflation, and observing the position where the bubbles are generated on the surface of the inner cylinder, wherein the position where the bubbles are generated is the position of a leakage point.
10. A method of detecting connectivity of a multi-layered packaging container as claimed in claim 1, wherein: and simultaneously opening the upper airway and the lower airway, introducing gas from any one of the upper airway or the lower airway, and judging the connectivity of the air gap cavity by detecting whether the gas flows out from the other one.
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