CN120308440A - Hot melt sealing clamping structure, sealing device and method based on shape memory effect - Google Patents
Hot melt sealing clamping structure, sealing device and method based on shape memory effectInfo
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- CN120308440A CN120308440A CN202510761702.XA CN202510761702A CN120308440A CN 120308440 A CN120308440 A CN 120308440A CN 202510761702 A CN202510761702 A CN 202510761702A CN 120308440 A CN120308440 A CN 120308440A
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Abstract
The invention provides a hot-melt sealing clamping structure, a sealing device and a method based on a shape memory effect, and relates to the technical field of sealing, wherein the hot-melt sealing clamping structure comprises sealing strips, wherein the sealing strips are used for clamping and heating a bag opening sealing area of a bag so as to realize hot-melt sealing of the bag; the sealing strip is made of a shape memory material and is further used for deforming based on a shape memory effect, so that the clamping surface of the sealing area of the bag opening moves and changes along the clamping direction. When in use, the sealing strip is moved to preliminarily clamp the sealing area of the bag mouth, and then the sealing strip is driven to deform based on the shape memory effect, so that the sealing area of the bag mouth is further pressed and clamped, thus forming two-stage stepped clamping.
Description
Technical Field
The invention relates to the technical field of sealing, in particular to a hot-melt sealing clamping structure, a sealing device based on a shape memory effect and a method.
Background
With the vigorous development of aerospace industry, deep space exploration has become a hot spot for the competition of aerospace institutions in various countries, the application of plastic bags for packaging samples has also been remarkably progressed in the task of carrying samples back to the earth from space, and the plastic bags for packaging samples are required to be subjected to reliable sealing in addition to proper plastic bag materials and specifications so as to ensure that the samples can maintain tightness and integrity when going to and from space and the earth.
In the prior art, some devices for sealing plastic bags in space adopt a pin puller made of shape memory materials, the pin puller is unlocked by triggering the deformation of the shape memory materials, then a spring is reset to drive a sealing strip to clamp the bag mouth of the plastic bag, and then the sealing strip is heated to realize hot-melt sealing. In such sealing devices, the sealing strip is pushed to move to clamp the bag mouth by external force (such as spring restoring force), so that the clamping action is completed once, however, the sample packaging plastic bags used in space are required to have higher tearing resistance, puncture resistance and ageing resistance to bear the extreme environment of space, so that the thickness of the plastic bags is generally thicker than that of the common plastic bags, the strength and toughness are also larger, and in order to hold space samples in the plastic bags, the bag mouth is generally opened in the maximum state, so that the bag mouth is stressed by one-time clamping, and the sealing quality is influenced.
Disclosure of Invention
The invention solves the problem of how to avoid the generation of stress when clamping the bag mouth of the plastic bag and improve the quality of the hot-melt seal of the plastic bag in space.
In order to solve the above problems, the present invention provides a heat-sealing clamping structure, and a sealing device and a method based on shape memory effect.
In a first aspect, the invention provides a hot-melt sealing clamping structure, which comprises sealing strips, wherein the sealing strips are used for clamping and heating a bag opening sealing area of a bag to realize hot-melt sealing of the bag, the sealing strips are made of shape memory materials and are also used for deforming based on the shape memory effect, so that a clamping surface of the bag opening sealing area is moved and changed along a clamping direction.
Optionally, the sealing strip deforms based on a shape memory effect when the preset deformation temperature is higher than or equal to a preset deformation temperature, so that the clamping surface of the bag opening sealing area moves and changes along the clamping direction, and the preset deformation temperature is lower than the hot melting temperature of the bag.
Optionally, the hot-melt sealing clamping structure further comprises a clamping strip body, wherein the clamping strip body is used for supporting and arranging the sealing strip.
Optionally, a groove is provided on the clamping strip body, a groove cavity of the groove is used for providing the sealing strip, and a notch of the groove is configured to face a bag opening sealing area of the bag.
The invention provides a sealing device based on a shape memory effect, which comprises two hot-melt sealing clamping structures, a driving mechanism and a heating structure, wherein the driving mechanism is used for moving sealing strips to enable the two sealing strips to clamp a bag opening sealing area, and the heating structure is used for heating the sealing strips.
Optionally, the driving mechanism comprises an elastic reset mechanism, the elastic reset mechanism is provided with the hot-melt sealing clamping structure and a pin puller, and the pin puller is used for triggering the elastic reset mechanism to reset, so as to further move the sealing strips, and the two sealing strips clamp the sealing region of the bag opening.
The elastic reset mechanism comprises a mounting plate and elastic reset components symmetrically arranged on the mounting plate, the elastic reset components comprise a sliding shaft rod, a sliding block, a first elastic element and connecting rods, the sliding shaft rod is arranged on the mounting plate, the sliding block is arranged on the sliding shaft rod in a sliding mode, a main body of the sliding block extends to one side of the mounting plate, two connecting rods are arranged at the extending end of the main body of the sliding block, each connecting rod is used for being connected with one hot-melting sealing clamping structure, and the first elastic element is used for applying elastic force to the sliding block to prevent the sliding block from sliding on the sliding shaft rod.
Optionally, the sealing device based on the shape memory effect further comprises a bag basket for placing the bag, wherein basket openings of the bag basket are arranged opposite to the mounting plate at intervals and are connected through a plurality of supporting rods.
Optionally, the pin puller drives the insertion and extraction of the pin head through a shape memory effect.
In a third aspect, the present invention provides a sealing method based on shape memory effect, using the above-mentioned heat-seal clamping structure, comprising the steps of:
Moving the sealing strip to clamp the bag opening sealing area of the bag;
And heating the sealing strip to enable the sealing area of the bag opening to be molten, and before the sealing area of the bag opening is molten, the sealing strip is deformed due to temperature rise and shape memory effect, so that the clamping force applied to the sealing area of the bag opening is increased.
The hot-melt sealing clamping structure has the beneficial effects that when the hot-melt sealing clamping structure is used, the sealing strip is moved to preliminarily clamp the sealing area of the bag opening, and then the sealing strip is driven to deform based on the shape memory effect, so that the sealing area of the bag opening is further pressed and clamped, and further two-stage stepped clamping is formed. When the sealing strip is deformed and clamped again, the clamping force applied to the sealing area of the bag opening reaches a preset value, the sealing pressure is ensured, and finally, the stress is less when the sealing area of the bag opening is subjected to the clamping force, so that the sealing quality is improved.
Drawings
FIG. 1 is a schematic view of a heat seal nip structure of the present invention.
Fig. 2 is a schematic diagram of an initial state of the sealing device based on the shape memory effect.
FIG. 3 is a schematic view showing a state of clamping a bag by the shape memory effect-based sealing device of the present invention.
Fig. 4 is a schematic diagram showing an initial state of a pin puller of the sealing device based on the shape memory effect.
Fig. 5 is a schematic diagram showing a state of a pin puller of the sealing device based on the shape memory effect after operation.
Fig. 6 is a schematic diagram showing the detachment of a pin puller of the sealing device based on the shape memory effect.
FIG. 7 is a schematic view of the use process of the heat seal clip structure of the present invention.
Reference numerals illustrate:
1. Sealing strip, 11, heating film, 2, bag, 3, clamping strip body, 31, groove, 411, mounting plate, 4111, through hole, 4112, check spring, 412, sliding shaft rod, 413, sliding block, 414, first elastic element, 415, connecting rod, 42, pin puller, 421, pin head, 422, first seat board, 423, second seat board, 424, connecting plate, 425, second elastic element, 426, guide shaft, 427, guide sleeve, 6, bag basket, 61 and support bar.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. While the invention is susceptible of embodiment in the drawings, it is to be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided to provide a more thorough and complete understanding of the invention. It should be understood that the drawings and embodiments of the invention are for illustration purposes only and are not intended to limit the scope of the present invention.
The term "comprising" and variations thereof as used herein is meant to be open-ended, i.e., "including but not limited to," based at least in part on, "one embodiment" means "at least one embodiment," another embodiment "means" at least one additional embodiment, "some embodiments" means "at least some embodiments," and "optional" means "optional embodiment. Related definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish between different devices, modules or units, and are not intended to limit the order or interdependence of functions performed by these devices, modules or units.
It should be noted that references to "a" and "an" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.
Before the embodiment of the invention is described, two technical knowledge of the shape memory effect and the hot-melt sealing are described.
Shape memory effect-a phenomenon in which a solid material having a certain shape is heated to a temperature above a certain critical temperature inherent to the material after plastic deformation in a certain low temperature state, and then the material returns to its original shape, is called shape memory effect. Materials with shape memory effects are referred to as shape memory materials.
The hot melt sealing technique utilizes thermal energy to melt and bond two or more plastic films. In the sealing process, the plastic films are heated by the heating element to be in a molten state, and then are rapidly cooled and solidified under pressure, so that firm combination between the films is realized. The sealing mode can ensure the tightness and the integrity of the package and effectively prevent the product from being polluted by the outside.
As shown in FIG. 1, the hot-melt sealing clamping structure provided by the embodiment of the invention comprises a sealing strip 1, wherein the sealing strip 1 is used for clamping and heating a bag opening sealing area of a bag 2 to realize hot-melt sealing of the bag 2, the sealing strip 1 is made of a shape memory material, and the sealing strip 1 is also used for deforming based on the shape memory effect, so that a clamping surface of the bag opening sealing area moves and changes along a clamping direction.
The two strips 1 are spaced and opposite, and the relative positions of the strips 1 and the sealing area of the bag mouth are initially shown as (A) in figure 7. When the clamping device is used, the sealing strip 1 is moved to preliminarily clamp the sealing area of the bag opening, and then the sealing strip 1 is driven to deform based on the shape memory effect, so that the clamping surface of the sealing strip 1 to the sealing area of the bag opening moves and changes along the clamping direction, namely the sealing area of the bag opening is further pressed and clamped, and two-stage stepped clamping is formed. When in preliminary clamping, as shown in (B) in fig. 7, the clamping force applied to the sealing area of the bag opening is small, the small clamping force can be designed specifically according to the actual situation, the sealing area of the bag opening can be attached but attached untight, and thus after the preliminary clamping, the bag 2 can move in a mutually staggered manner due to the strength and toughness of the bag opening, so that the stress generated by the passive mutual attachment of the bag opening is released. And then driving the sealing strip 1 to deform based on the shape memory effect, and further clamping the sealing area of the bag opening on the basis of preliminary clamping, namely, clamping again, wherein the clamping force applied to the sealing area of the bag opening reaches a preset value as shown in (C) in fig. 7, the dimension of the sealing strip 1 after the shape memory deformation can be controlled, and finally, the two-stage stepped clamping ensures that the sealing pressure is ensured and the sealing quality is improved by reducing the stress when the sealing area of the bag opening is subjected to the clamping force.
The clamping direction refers to the direction of pressure applied by the sealing strip 1 to the bag mouth sealing area when the bag is sealed by hot melting, and the clamping surface refers to the surface which is directly contacted with the bag mouth sealing area of the bag 2 when the bag is sealed by hot melting. Usually, two sealing strips 1 are arranged opposite to each other, and the two sealing strips 1 move opposite to each other to clamp the sealing area of the bag mouth, and at this time, the moving direction of the sealing strips 1 can be considered as the clamping direction of the sealing strips 1.
Optionally, the sealing strip 1 is deformed based on shape memory effect when higher than or equal to a preset deformation temperature, so that the clamping surface of the sealing area of the bag mouth is moved and changed along the clamping direction, and the preset deformation temperature is lower than the hot melting temperature of the bag 2. Namely, the temperature of triggering the shape memory effect by the heat sealing strip 1 is lower than the hot melting temperature of the bag 2, so that when the heat sealing strip 1 clamps and heats the bag mouth sealing area, the heat sealing strip 1 is deformed firstly due to the temperature rise and the shape memory effect, then the heat sealing strip 1 continuously rises, the bag mouth sealing area is melted, namely, the heat sealing strip 1 completes the deformation based on the shape memory effect before the bag mouth sealing area is hot melted, the clamping force is increased before the hot melting occurs, the clamping is completed again, the sealing pressure is effectively ensured, in addition, the same heat source is utilized to drive the shape memory effect of the heat sealing strip 1, and the heat sealing area is melted, so that the heat sealing strip has ingenious design and simple structure.
Optionally, the hot melt sealing clip structure further comprises a clip strip body 3, wherein the clip strip body 3 is used for supporting and arranging the sealing strip 1. The clamping strip body 3 is used for supporting and arranging, so that the installation and arrangement of the clamping strip are convenient in the whole sealing equipment.
In addition, since the sealing strip 1 needs to be able to withstand and conduct heat, it is preferably made of a shape memory alloy. The invention selects one-way shape memory alloy, the austenite transformation temperature is selected to be 100-120 ℃, and the martensite transformation temperature is selected to be-200-180 ℃. Correspondingly, the bag 2 is a thermoplastic polymer, and the hot melting temperature ranges from 250 ℃ to 300 ℃.
The shape memory alloy is a metal alloy with special phase transformation behavior, can recover to a preset shape under specific thermal excitation or external conditions, and the principle behind the shape memory alloy relates to the transformation of a crystal structure of a material at different temperatures, in particular to the transformation process from a low-temperature martensite phase to a high-temperature austenite phase. The shape memory effect of the shape memory alloy is derived from the phase transformation characteristic, and the lattice structure of the shape memory alloy is a low-symmetry martensitic structure at a lower temperature, so that the shape memory alloy has a larger deformation capacity, and can be deformed by external force or temperature change. The reversibility of the process is an important physical property of shape memory alloys, so that they can be recovered for a plurality of times under repeated temperature changes, and are widely used in the aerospace field. Different types of shape memory alloys are selected according to different requirements of use environments, and comprise nickel-titanium alloys, copper-based alloys and iron-based alloys.
Optionally, the strip body 3 is provided with a groove 31, the cavity of the groove 31 is used for arranging the sealing strip 1, and the notch of the groove 31 is configured towards the bag mouth sealing area of the bag 2. The sealing strip 1 is embedded through the groove 31 structure, the structure is simple, and the positioning is reliable. It should be noted that, at the position where the sealing strip 1 faces the notch of the groove 31, the notch of the groove 31 is protruded or is flush with the notch of the groove 31, the surface forms a clamping surface for directly contacting with the bag 2, and after the sealing strip 1 is deformed based on the shape memory effect, the clamping surface moves in the clamping direction, i.e. in the direction extending out of the notch, so as to clamp the bag mouth sealing area of the bag 2.
As shown in fig. 1, one possible structure of the strip body 3 and the strip 1 is illustrated. Specifically, the clamping strip body 3 and the sealing strip 1 are both in a cuboid block shape, a rectangular groove which is a groove 31 with two ends penetrating is formed on one side surface of the clamping strip body 3, the sealing strip 1 is adaptively embedded in the rectangular groove 31, and the side surface exposed from the notch is the clamping surface. In addition, the sealing strip 1 can be fixed with the clamping strip body 3 through bonding, welding, bolting and other modes, and according to actual design, attention is paid to reduce the influence on the deformation of the sealing strip 1 as much as possible.
As shown in fig. 2-6, the sealing device based on the shape memory effect provided by the embodiment of the invention comprises two hot-melt sealing clamping structures, a driving mechanism and a heating structure, wherein the driving mechanism is used for moving the sealing strips 1 to enable the two sealing strips 1 to clamp a bag mouth sealing area, and the heating structure is used for heating the sealing strips 1.
This closing device based on shape memory effect utilizes actuating mechanism to remove sealing strip 1 and realizes preliminarily pressing from both sides tight sack sealing zone, and rethread heating structure drive sealing strip 1 takes place to take place the deformation based on shape memory effect for sealing strip 1 is to the clamp face of sack sealing zone along pressing from both sides tight direction removal change, realizes pressing from both sides again promptly, further presss from both sides tight sack sealing zone, thereby forms the clamp of two-stage ladder formula, makes sack sealing zone because the stress that presss from both sides tightly to produce is few, also can effectively guarantee sealing pressure, improves sealing quality.
Optionally, the driving mechanism comprises an elastic reset mechanism, a hot-melt sealing clamping structure and a pin puller 42 are arranged on the elastic reset mechanism, and the pin puller 42 is used for triggering the elastic reset mechanism to reset, so that the sealing strips 1 are moved to enable the two sealing strips 1 to clamp the sealing area of the bag opening.
The elastic reset mechanism is of a common structure and is generally composed of an elastic element, a supporting piece, a reset piece and the like, when external force is applied, the elastic element deforms and stores energy, and when the external force disappears, the spring releases the stored energy to push the reset piece to return to an original position, so that a reset function is realized. The elastic resetting mechanism is used for moving the sealing strip 1 to clamp the sealing area of the bag opening, namely the sealing strip 1 is a resetting piece, and external force is applied by the pin puller 42 and is realized by plugging the pin head 421.
Optionally, the elastic reset mechanism comprises a mounting plate 411 and an elastic reset assembly symmetrically arranged on the mounting plate 411, the elastic reset assembly comprises a sliding shaft rod 412, a sliding block 413, a first elastic element 414 and a connecting rod 415, the sliding shaft rod 412 is arranged on the mounting plate 411, the sliding block 413 is arranged on the sliding shaft rod 412 in a sliding mode, the main body of the sliding block 413 extends to one side of the mounting plate 411, two connecting rods 415 are arranged at the extending end of the main body of the sliding block 413 and are used for being connected with a hot-melt sealing clamping structure, and the first elastic element 414 is used for applying elastic force to the sliding block 413 to prevent the sliding block 413 from sliding on the sliding shaft rod 412.
The elastic resetting mechanism is specifically shown in fig. 2 and3, the two sealing strips 1 are designed to be arranged in parallel and opposite, the mounting plate 411 is arranged at the top of the two heat-seal clamping structures, and the plate surface is perpendicular to the symmetrical surfaces of the two sealing strips 1. The sliding shaft 412 is provided on the mounting plate 411 with its axis on the symmetry plane of the two sealing strips 1 and parallel to the plate surface of the mounting plate 411. The first elastic element 414 is sleeved on the sliding shaft 412 by a spring, one end of the first elastic element contacts and abuts against the sliding block 413, and the other end of the first elastic element contacts and abuts against the end limiting structure of the sliding shaft 412. The sliding block 413 can slide on the sliding shaft 412, and the other end of the sliding shaft 412 is also provided with a limiting structure to prevent the sliding block 413 from sliding off the sliding shaft 412, and the sliding block 413 always compresses the first elastic element 414 at any position on the sliding shaft 412, so that the first elastic element 414 always applies a pushing force to the sliding block 413.
In order to enable the slider 413 to drive the sealing strips 1 to move, the main body of the slider 413 extends to one side of the mounting plate 411, specifically extends to the side provided with the sealing strips 1, two connecting rods 415 are arranged at the extending ends, one end of each connecting rod 415 is rotationally connected with the end part of one sealing strip 1 through a rotating shaft, the other end of each connecting rod 415 is rotationally connected with the slider 413 through a rotating shaft, the rotating shafts at the two ends of the connecting rods 415 are perpendicular to the plate surface of the mounting plate 411, and finally the two sealing strips 1 or the two hot-melt sealing clamping structures are pulled by the two sliders 413 through four connecting rods 415 and can reciprocally move in opposite directions to clamp or release the bag opening sealing area of the bag 2.
Optionally, the slider 413 is T-shaped, and the vertical structure end of the T-shaped structure is slidably disposed on the sliding shaft 412, and two ends of the horizontal structure are respectively provided with a connecting rod 415.
Optionally, the sealing device based on shape memory effect further comprises a bag basket 6 for placing the bag 2, wherein the basket opening of the bag basket 6 is arranged opposite to the mounting plate 411 at intervals and is connected through a plurality of support rods 61. The mounting plate 411 and the hot-melt sealing clamping structure are integrated on the bag basket 6, so that the whole sealing process is simple and quick to operate, sealing can be completed quickly after articles are put into the bag 2, and the sealing device is suitable for sealing samples in space.
Specifically, the basket body of the bag basket 6 is cylindrical, is matched with the body of the bag 2, and provides support and protection for the bag 2, the basket opening extends outwards to form a plane plate, the plane plate and the mounting plate 411 are arranged in parallel and opposite to each other, and the two plate bodies are in support connection through four support rods 61. The heat seal nip structure is disposed between the basket mouth and the mounting plate 411, the main body of the bag 2 is placed in the bag basket 6, and the bag mouth extends from the basket mouth and extends up to the two heat seal nip structures, so that the bag mouth seal area is located between the two seal strips 1. The mounting plate 411 is provided with a through hole 4111, the through hole 4111 is used for providing a passage for placing samples, in order to prevent the samples placed in the bag 2 from falling out in space, the through hole 4111 is provided with a non-return elastic piece 4112, the non-return elastic piece 4112 has elasticity, the main body extends from the inner wall of the through hole 4111 to the center of the through hole 4111 in an inclined manner, and four non-return elastic pieces are uniformly arranged at intervals along the circumference of the through hole 4111. In addition, two slide shafts 412 are provided on both sides of the through hole 4111.
In addition, the bag basket 6 can be made of composite materials, the matrix phase can be made of polymers such as epoxy, cyanate esters and the like, the reinforcing phase can be made of continuous fibers, chopped fibers or particles, and the commonly used continuous fibers with good mechanical properties such as carbon fibers, glass fibers, aramid fibers, polyethylene fibers and the like are selected.
Alternatively, the pin puller 42 drives the insertion and extraction of the pin head 421 by a shape memory effect. Because the space environment is complex and changeable, the equipment is required to have high reliability, the shape memory material driven pin puller 42 has excellent mechanical property and stability, and the weight is lighter, so that the requirements of space tasks on the reliability of the equipment can be met.
Optionally, pin heads 421 are inserted over the heat seal nip structure. As shown in fig. 2 and 3, there are two pin extractors 42, and each pin extractor 42 acts on one of the strip bodies 3, and a pin hole adapted to the pin head 421 can be formed in the strip body 3.
Alternatively, as shown in fig. 4-6, the pin puller 42 includes a first seat board 422, a second seat board 423 and a connecting board 424, where the boards of the first seat board 422 and the second seat board 423 are parallel and opposite, the first seat board 422 and the second seat board 423 are connected by the connecting board 424, the first seat board 422 is fixed on the mounting board 411, the board of the second seat board 423 far away from the first seat board 422 is provided with a pin 421, the connecting board 424 is made of a shape memory material, and based on shape memory deformation, the board body can be bent, and the second seat board 423 and the first seat board 422 are made to approach each other, so as to realize the pin 421 pulling. The pin puller 42 is in an initial state as shown in fig. 4, and the pin puller 42 is in a post-actuation state as shown in fig. 5, the web 424 is deformed based on the shape memory effect to bend the plate.
Optionally, a second elastic element 425 is further disposed between the first seat plate 422 and the second seat plate 423, and the second elastic element 425 applies elastic tension to the first seat plate 422 and the second seat plate 423, so that the first seat plate 422 and the second seat plate 423 have a tendency to approach each other.
Optionally, a guide shaft 426 is disposed on a plate surface of the first seat plate 422 opposite to the second seat plate 423, and the second elastic element 425 is sleeved on the guide shaft 426 by a spring, and one end of the second elastic element is fixed on the first seat plate 422, and the other end of the second elastic element is fixed on the second seat plate 423. In addition, a guide sleeve 427 matched with the guide shaft 426 is arranged on the second seat plate 423, the guide sleeve 427 is sleeved at the end part of the guide shaft 426, and the guide sleeve 427 and the guide shaft 426 can move relatively along the axial direction after being mutually nested. The pin puller 42 has accurate moving path and small offset when pulling pins, namely, when the second seat plate 423 moves towards the first seat plate 422.
Alternatively, the connection plate 424 may be made of a shape memory polymer composite material, which is an intelligent material capable of returning from a temporary state to an original state under the action of external stimulus such as light, heat, electricity, magnetism, etc., and has the advantages of large stiffness/weight ratio, light weight, large expansion/storage ratio, etc., and the shape memory pin puller 42 to which the present invention is applied may be released by electric heating drive.
In addition, the shape memory polymer composite material comprises a matrix phase and a reinforcing phase, wherein the matrix phase refers to a polymer material, different resins are selected according to different requirements of use environments, and epoxy or cyanate type shape memory polymers are generally selected. The glass transition temperature of the epoxy shape memory polymer is selected to be 80-180 ℃, and the glass transition temperature of the cyanate shape memory polymer is selected to be 180-200 ℃. The reinforcing phase can be continuous fibers, chopped fibers or particles, and is selected from commonly used continuous fibers with good mechanical properties, such as carbon fibers, glass fibers, aramid fibers, polyethylene fibers and the like, so that the shape memory pin puller 42 has good locking force and stability and good aerospace application value.
Optionally, the heating structure comprises a heating film 11 provided on the sealing strip 1 for heating. As shown in fig. 1, the heating film 11 may be attached to both upper and lower surfaces of the sealing strip 1, and the heating film 11 also has flexibility to move, with less influence from deformation of the sealing strip 1.
In use, as shown in FIG. 2, the sealing device is in an initial state in which the two sealing strips 1 or the two hot-melt sealing and clamping structures are spaced apart from each other and wait for clamping the sealing area of the bag opening. In the initial state, the bag 2 is placed in the bag basket 6, the bag opening is opened, the pin heads 421 of the pin puller 42 are inserted into the pin holes of the clamping strip body 3, the connecting rod 415 and the sliding block 413 are in transmission connection, the first elastic element 414 is sleeved on the sliding shaft rod 412 by adopting a spring, and the compression state of the first elastic element 414 is maintained by the pin puller 42, so that the two sealing strips 1 are kept open. When the sampler enters the bag 2 and is detected in place, the sampler is restrained from falling out of the main body of the bag 2 through the non-return elastic sheet 4112, an instruction is given to the sealing device, the driving connection plate 424 deforms based on a shape memory effect, the pin head 421 is pulled out of the pin hole of the clamping strip body 3, the compressed first elastic element 414 releases elastic potential energy to push the sliding block 413, the sliding block 413 moves until the end part of the sliding shaft rod 412 is limited and kept, the connecting rod 415 drives the hot-melting sealing clamping structure, the initial clamping of the bag mouth sealing area of the bag 2 is achieved, as shown in fig. 3, then the sealing strip 1 is heated, the sealing strip 1 deforms due to the shape memory effect in the temperature rising process of the sealing strip 1, the sealing strip 1 is further extruded to clamp the bag mouth sealing area due to the deformation, the clamping force born by the bag mouth sealing area is increased, the requirement of the hot-melting pressure is met, the temperature of the sealing strip 1 is further increased, the bag mouth sealing area is melted, and then the bag mouth sealing area is cooled, and complete sealing is achieved.
As shown in FIG. 7, the sealing method based on the shape memory effect provided by the embodiment of the invention comprises the following steps S10-S30.
Step S10, driving the sealing strip 1 to clamp the bag opening sealing area of the bag 2.
And step S20, heating the sealing strip 1 to melt the sealing area of the bag mouth, and before the sealing area of the bag mouth is melted, deforming the sealing strip 1 due to temperature rise and shape memory effect to increase the clamping force applied to the sealing area of the bag mouth.
In the process of raising the temperature of the sealing strip 1, the sealing strip 1 deforms due to the shape memory effect, the sealing strip 1 is further extruded to clamp the sealing area of the bag mouth due to the deformation, the clamping force applied to the sealing area of the bag mouth is increased, and then the temperature of the sealing strip 1 is continuously raised, so that the sealing area of the bag mouth is melted.
Optionally, the sealing method based on the shape memory effect further comprises the step S30 of stopping heating the sealing strip 1 to cool and solidify the sealing area of the bag opening so as to finish sealing.
Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510761702.XA CN120308440A (en) | 2025-06-09 | 2025-06-09 | Hot melt sealing clamping structure, sealing device and method based on shape memory effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510761702.XA CN120308440A (en) | 2025-06-09 | 2025-06-09 | Hot melt sealing clamping structure, sealing device and method based on shape memory effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN120308440A true CN120308440A (en) | 2025-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510761702.XA Pending CN120308440A (en) | 2025-06-09 | 2025-06-09 | Hot melt sealing clamping structure, sealing device and method based on shape memory effect |
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| Country | Link |
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| CN (1) | CN120308440A (en) |
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2025
- 2025-06-09 CN CN202510761702.XA patent/CN120308440A/en active Pending
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