FRP tube sleeve heat shrink film device and processing method

Abstract

This application provides a fiberglass tube sleeve heat shrink film device and processing method. The fiberglass tube sleeve heat shrink film device includes: a first support; a feeding device; a first processing device, including a first mounting seat and a second mounting seat that slide relative to each other along a first direction, the first mounting seat being provided with a cutter and the second mounting seat being provided with a cutter holder; the first mounting seat being provided with a first adsorption device for adsorbing one side surface of the hollow heat shrink film, and the second mounting seat being provided with a second adsorption device for adsorbing the other side surface of the hollow heat shrink film; a support device; a transfer device; a stretching device that slides between a first position and a second position along the feeding direction of the hollow heat shrink film, including a clamping component, wherein when the stretching device is in the first position, the clamping component clamps the unfolded hollow heat shrink film, and when the stretching device is in the second position, the hollow heat shrink film is sleeved onto the fiberglass tube sleeve; and a heat shrinking device. The fiberglass tube sleeve heat shrink film device itself helps to reduce the complexity of the equipment.

Description

Technical Field

[0001] This application relates to the field of composite material processing equipment and automated packaging manufacturing, and in particular to a fiberglass tube sleeve heat shrink film device and processing method. Background Technology

[0002] Surface protection of glass sleeves (FRP pipes) usually adopts heat shrink film sleeve process, which combines heating shrink, cutting and wrapping and conveying positioning to complete continuous processing.

[0003] In related technologies, heat shrink film is thin and has strong electrostatic adsorption properties. After cutting, it is very easy to curl, stick or sag, making it difficult to keep flat. It needs to be unfolded by additional mechanical grippers, airflow or conveyor belt, which not only increases the complexity of the equipment, but also easily affects the film covering accuracy. Summary of the Invention

[0004] This application provides a heat shrink film device and processing method for fiberglass tube sleeves. By integrating the cutting function and the adsorption and unfolding function into the first processing device, the integration of the equipment is improved. The first processing device adsorbs and unfolds the hollow heat shrink film while completing the cutting, which helps to reduce the impact on the sleeve accuracy.

[0005] In a first aspect, embodiments of this application provide a heat-shrinkable film device for fiberglass tube sleeves, comprising: a first support; a feeding device disposed on the first support for conveying hollow heat-shrinkable film; and a first processing device disposed on the first support, the first processing device including a first mounting base and a second mounting base, the first mounting base and the second mounting base sliding relative to each other along a first direction, the first direction being perpendicular to the feeding direction of the hollow heat-shrinkable film, the first mounting base being provided with a cutting element, and the second mounting base being provided with a blade holder corresponding to the cutting element; wherein, the first mounting base is provided with a first adsorption device for adsorbing one side surface of the hollow heat-shrinkable film along the first direction, and the second mounting base is provided with a device for adsorbing the hollow heat-shrinkable film along the first direction. A second adsorption device on the other side surface of the direction; a support device, disposed on the first support, for supporting the fiberglass tube sleeve; a transfer device for transferring the fiberglass tube sleeve to the support device; a stretching device adapted to slide between a first position and a second position along the feeding direction of the hollow heat-shrinkable film, the stretching device including a clamping assembly, wherein when the stretching device is in the first position, the clamping assembly clamps the hollow heat-shrinkable film unfolded on the first processing device, and when the stretching device is in the second position, the unfolded hollow heat-shrinkable film is sleeved on the fiberglass tube sleeve; a heat-shrinking device, wherein the transfer device is further used to transfer the fiberglass tube sleeve sleeved with the hollow heat-shrinkable film to the heat-shrinking device, the heat-shrinking device being used to heat the hollow heat-shrinkable film.

[0006] In some embodiments, a second bracket is provided on the first bracket, the first processing device is provided on the second bracket, the second bracket is provided with a first cylinder and a second cylinder, and the extension and retraction ends of the first cylinder and the second cylinder move relative to each other along the first direction; the first mounting seat is fixedly provided on the extension and retraction end of the first cylinder, and the second mounting seat is fixedly provided on the extension and retraction end of the second cylinder.

[0007] In some embodiments, both the first adsorption device and the second adsorption device are vacuum adsorption plates; or, the first adsorption device includes a plurality of suction cups arranged along a second direction, and the second adsorption device includes a plurality of suction cups arranged along a second direction.

[0008] In some embodiments, along the feeding direction of the hollow heat-shrinkable film, the first adsorption device is located on the side of the cutter facing the feeding device.

[0009] In some embodiments, the first support is provided with a synchronous belt device extending along the feeding direction of the hollow heat-shrinkable film; the stretching device includes a third support, which is drively connected to the synchronous belt device; the clamping assembly includes a first clamping member and a second clamping member, which are arranged opposite to each other along the first direction; the first clamping member is used to clamp the hollow heat-shrinkable film adsorbed by the first adsorption device; the second clamping member is used to clamp the hollow heat-shrinkable film adsorbed by the second adsorption device; and / or, the first clamping member includes at least two jaws arranged along the second direction; the second clamping member includes at least two jaws arranged along the second direction.

[0010] According to some embodiments of the present invention, the third bracket is provided with two third mounting seats opposite each other along the second direction, and each of the two third mounting seats is provided with a support member that slides relative to each other along the second direction; and / or, the support member includes at least two support rods arranged at intervals along the first direction.

[0011] In some embodiments, the fiberglass tube heat shrink film device further includes a film pressing device, which is located between the feeding device and the first processing device. The film pressing device includes a fourth support, a pressure plate, and a conveying roller. The fourth support is fixedly installed on the first support, the conveying roller is fixedly installed on the fourth support, and the pressure plate is movably installed on the fourth support along the first direction.

[0012] In some embodiments, the transfer device includes a robotic arm.

[0013] In some embodiments, the heat shrinking device includes an infrared heating device disposed on a fifth bracket, and a transmission device is disposed on the fifth bracket, with the infrared heating device facing the transmission device.

[0014] Secondly, this application also provides a method for processing heat-shrink film on fiberglass tube sleeves, applied to the aforementioned heat-shrink film device for fiberglass tube sleeves, the method comprising the following steps:

[0015] The transfer device transfers the fiberglass pipe sleeve to the support device for support and fixation;

[0016] The first processing device cuts hollow heat-shrink film;

[0017] The first and second adsorption devices adsorb and unfold the hollow heat-shrinkable film;

[0018] The stretching device moves to the first position, and the clamping component clamps the unfolded hollow heat shrink film.

[0019] The first and second adsorption devices release hollow heat-shrinkable film.

[0020] The stretching device moves to the second position and places the unfolded hollow heat shrink film onto the fiberglass tube sleeve.

[0021] The transfer device transfers the fiberglass tube sleeve fitted with hollow heat-shrink film to the heat-shrink device for heating.

[0022] The fiberglass tube heat shrink film device and processing method provided in this application integrate the cutting and adsorption unfolding functions into the first processing device. On the one hand, this eliminates the need for separate clamping equipment, airflow guidance, or conveying unfolding mechanisms in traditional processes, reducing transmission components and control units, and thus lowering the overall complexity and manufacturing cost. On the other hand, by applying negative pressure adsorption to both edges of the heat shrink film immediately after the cutting action, the first processing device can overcome the curling, adhesion, or sagging phenomena caused by static electricity, self-weight, or elastic retraction of the hollow heat shrink film, keeping it in a flat and open state. This provides a good premise for subsequent accurate covering, avoids positional deviation or posture disorder during intermediate transfer, and ensures that the unfolding center of the heat shrink film is aligned with the axis of the FRP tube, thereby improving the concentricity and wrapping consistency of the film and reducing the scrap rate of the product. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] Figure 1 This is a schematic diagram of the structure of the fiberglass tube sleeve heat shrink film device according to an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the structure on the first support in an embodiment of this application;

[0026] Figure 3This is a schematic diagram of the structure of the first processing apparatus according to an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the tensioning device according to an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the film pressing device according to an embodiment of this application;

[0029] Figure 6 This is a step diagram of the fiberglass tube sleeve heat shrink film processing method according to an embodiment of this application.

[0030] Figure label:

[0031] 110 - First support; 111 - Synchronous belt device;

[0032] 120 - Feeding device;

[0033] 130 - First processing device; 131 - First mounting base; 1311 - First adsorption device; 132 - Second mounting base; 1321 - Second adsorption device; 133 - Cutting tool; 134 - Tool holder; 135 - Second bracket; 136 - First cylinder; 137 - Second cylinder;

[0034] 140 - Support device;

[0035] 150 - Transfer device;

[0036] 160 - Tensioning device; 161 - Clamping assembly; 1611 - First clamping member; 1612 - Second clamping member; 1613 - Gripper; 162 - Third bracket; 1621 - Third mounting base; 1622 - Support member; 1622a - Support rod;

[0037] 170 - Heat shrink device; 171 - Infrared heating device; 172 - Fifth support; 173 - Transmission device;

[0038] 180-Film pressing device; 181-Fourth support; 182-Pressing plate; 183-Conveyor roller.

[0039] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0040] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0041] The heat-shrink film processing technology for FRP (fiberglass reinforced plastic) pipe sleeves is mainly used in industrial scenarios such as electronics manufacturing, composite material product processing, and pretreatment of roll-mounted substrates. It is particularly suitable for continuous production lines with high requirements for the integrity, roundness, and uniformity of the FRP pipe's outer surface. In these applications, the FRP pipe sleeve typically serves as the base carrier for subsequent winding, protection, assembly, or surface treatment. The heat-shrink film needs to be applied and shrunk before entering the next process to form a stable, flat, and accurately positioned outer coating.

[0042] Current heat-shrink film processes for fiberglass tube sleeves typically employ continuous film feeding combined with localized cutting and heat shrinking to form the outer film layer. The basic idea is to install a feeding mechanism on the equipment frame to transport the hollow heat-shrink film to a predetermined station. Then, independent cutting, spreading, and loading mechanisms work together to cut, open, and fit the film. Afterward, steam or hot air heating is used to ensure the heat-shrink film adheres tightly to the outer surface of the fiberglass tube sleeve. From a working principle perspective, the film needs to maintain stable axial flow during transport, and the cut must be neat. Before fitting, the originally flattened or insufficiently spread hollow heat-shrink film needs to be laterally separated and appropriately unfolded so that the fiberglass tube sleeve can smoothly enter the film cavity. In traditional solutions, this unfolding process often relies on multiple moving components, such as push plates, grippers, suction nozzles, guides, or spreading components, to gradually open the film opening, followed by the conveying mechanism or manual assistance to feed the fiberglass tube sleeve in. After heat shrinking, the wrapped tube needs to be sent to the next station. While these solutions can meet basic production needs, their limitations become increasingly apparent as requirements for cycle time, precision, and surface quality increase. First, steam or hot air heating is a relatively indirect heat transfer method with a limited thermal response speed. The film typically takes a long time to shrink from the initial heating stage, which is unfavorable for high-cycle continuous production. Furthermore, the temperature distribution is easily affected by the environment, air ducts, and workpiece posture, leading to insufficient shrinkage or overheating in certain areas. Second, traditional film coating processes involve numerous dispersed cutting, unfolding, and conveying components, requiring complex timing coordination between mechanisms. Accumulated errors or linkage lags can easily cause deviations in film cutting, unfolding posture, or coating position, thus affecting coating consistency.

[0043] To address the aforementioned technical issues, a heat-shrink film device for fiberglass tube sleeves is provided. By integrating the cutting and adsorption unfolding functions into the first processing device, the integration level of the equipment is improved. The first processing device adsorbs and unfolds the hollow heat-shrink film while completing the cutting, which helps to reduce the impact on the sleeve accuracy.

[0044] For ease of description and understanding, in this application, the feeding direction of the hollow heat-shrinkable film can be the length direction of the first support (e.g., Figure 1 The X direction shown), the first direction can be the height direction of the first bracket (e.g., Figure 1 The Z direction shown), the second direction can be the width direction of the first bracket (e.g., the Z direction). Figure 1 Y direction shown).

[0045] refer to Figures 1 to 5 In a first aspect, embodiments of this application provide a heat shrink film device for fiberglass pipe sleeves, including a first support 110, a feeding device 120, a first processing device 130, a supporting device 140, a transfer device 150, a stretching device 160, and a heat shrink device 170.

[0046] The first bracket 110 is used as the load-bearing frame of the whole machine to fix each functional module. The first bracket 110 is usually located at the bottom or circumferential periphery of the whole machine in physical position, and forms an overall frame by welding, bolting or profile assembly. Each functional module is installed on the first bracket 110.

[0047] Specifically, the dimensions of the first support 110 are usually designed based on the length of the fiberglass tube sleeve, the width of the heat shrink film, and the arrangement of the workstations. The overall length can correspond to the layout requirements of the conveying and heat shrinking paths, the width can meet the installation spacing of the left and right side mechanisms, and the height needs to leave enough space for the movement of the film material, the tube sleeve transfer and the heating cavity.

[0048] The feeding device 120 is a film material conveying mechanism installed on the first support 110. It is used to stably convey hollow heat shrink film in a flattened, rolled or folded state to the feeding side of the first processing device 130, so that the subsequent cutting and unfolding operations have consistent material feeding conditions.

[0049] Understandably, the feeding device 120 is usually located at the receiving end of the fiberglass tube heat shrink film device and is arranged in the same direction as the feeding direction of the first processing device 130. The two can be connected by a guide roller, a limiting roller or a tensioning mechanism (such as the pressing mechanism described later) to form a film path connection.

[0050] The first processing device 130 is a film material cutting and unfolding mechanism installed on the first support 110. It is used to complete the fixed-length cutting after the hollow heat shrink film reaches the predetermined station, and after cutting, to hold and unfold the hollow heat shrink film on both sides along the first direction to form an opening state (e.g., a rectangular opening) that is easy to fit into the fiberglass tube sleeve.

[0051] In the feeding direction (X direction) of the hollow heat shrink film, the first processing device 130 is located downstream of the feeding device 120 and upstream of the stretching device 160.

[0052] The first processing device 130 includes a first mounting base 131 and a second mounting base 132. The first mounting base 131 and the second mounting base 132 slide relative to each other along a first direction (Z direction), which is perpendicular to the feeding direction of the hollow heat shrink film. Specifically, the first mounting base 131 and the second mounting base 132 can be a linear slider type mounting base, a guide rail slide table type mounting base, or a cylinder push-pull type mounting base.

[0053] The first mounting base 131 is provided with a cutting blade 133, and the second mounting base 132 is provided with a blade holder 134 corresponding to the cutting blade 133. Thus, during the relative sliding process of the first mounting base 131 and the second mounting base 132, the cutting blade 133 and the blade holder 134 are engaged and closed (cutting the hollow heat-shrink film) and then separated and opened. The cutting blade 133 can be a straight blade, an arc blade, or a beveled blade, and the blade holder 134 can be a metal blade groove, a wear-resistant liner, or a replaceable blade pad. The preferred materials are tool steel, stainless steel, or carbide inserts to ensure the wear resistance of the cutting edge and the neatness of the cut.

[0054] A first adsorption device 1311 is provided on the first mounting base 131 for adsorbing one side surface of the hollow heat shrink film along the first direction, so as to position and support one side (upper side) edge of the hollow heat shrink film material after cutting. The first adsorption device 1311 and the cutter 133 form a cooperative relationship in the feeding direction to prevent the film material from affecting the subsequent film covering posture due to springback, wrinkles or local warping after cutting. The first adsorption device 1311 may include one of a vacuum adsorption plate, an array suction cup plate or a porous adsorption plate, and the adsorption medium can be held through a vacuum channel, a negative pressure cavity or partitioned adsorption holes. The size of the first adsorption device 1311 usually covers one side of the hollow heat shrink film to be unfolded area, and the spacing of the adsorption hole array can be set according to the flexibility of the film material, the pore size and the vacuum degree requirements to ensure stable adsorption without damaging the film surface.

[0055] A second adsorption device 1321 is provided on the second mounting base 132. This device is used to adsorb the other side (lower side) of the hollow heat-shrinkable film along the first direction, and together with the first adsorption device 1311, forms a double-sided constraint and synchronous unfolding of the cut hollow heat-shrinkable film. The second adsorption device 1321 is arranged opposite to the first adsorption device 1311. Their coordinated action ensures that the hollow heat-shrinkable film maintains a stable unfolded state in both the axial and lateral directions after cutting, providing a unified reference for subsequent clamping and stretching. The specific structure of the second adsorption device 1321 can be the same as that of the first adsorption device 1311, and will not be described in detail here.

[0056] The stretching device 160 is a film-fitting actuator that slides between a first position and a second position along the feeding direction of the hollow heat-shrinkable film. It is used to clamp the unfolded hollow heat-shrinkable film on the first processing device 130 and stretch it to the outside of the fiberglass tube sleeve during the sliding process to complete the fitting. The stretching device 160 includes a clamping assembly 161. In the first position, the clamping assembly 161 clamps and positions the unfolded film material. In the second position, the clamping assembly 161 drives the film material to move along the feeding direction to the outer periphery of the fiberglass tube sleeve, so that the unfolded heat-shrinkable film gradually covers the surface of the tube sleeve. The driving device for moving the stretching device 160 along the feeding direction of the hollow heat-shrinkable film can include one of a moving frame with a slide table, a synchronous belt-driven slide, or a screw-guide rail moving mechanism.

[0057] The clamping assembly 161 is a clamping component disposed on the stretching device 160, used to clamp the hollow heat-shrinkable film unfolded on the first processing device 130 when the stretching device 160 is in the first position, and to maintain stable transmission of the film end during the stretching process. The clamping assembly 161 is fixedly connected to the moving frame or slide of the stretching device 160 and moves synchronously with the stretching device 160, thereby feeding the hollow heat-shrinkable film into the outer periphery of the fiberglass tube sleeve in a controlled manner.

[0058] Specifically, the clamping assembly 161 may include at least one of a pneumatic gripper, a clamp, a clamping plate, or a flexible clamping end; the clamping assembly 161 may be a metal clamping body, a rubber-coated clamping jaw, or a wear-resistant plastic clamping block, in order to improve clamping stability and reduce damage to the film surface.

[0059] It should be noted that the specific clamping area of ​​the clamping component 161 may exceed the coverage area of ​​the first adsorption device 1311 and the second adsorption device 1321, so as to avoid interference between the clamping component 161 and the first adsorption device 1311 and the second adsorption device 1321.

[0060] The support device 140 is a supporting mechanism mounted on the first bracket 110. It supports and positions the fiberglass tube sleeve before the film is fitted, ensuring the fiberglass tube sleeve maintains a stable posture and aligned axis when the stretching device 160 fits the hollow heat-shrink film. The support device 140 is located in the corresponding area of ​​the stretching device 160 in its second position and corresponds to the terminal unloading position of the transfer device 150, thus forming a reference station for film fitting and heat shrinking. The support device 140 may include an air-expansion shaft support structure that is adapted to the inner diameter of the fiberglass tube sleeve.

[0061] The transfer device 150 is a transfer mechanism used to move fiberglass tube sleeves between various workstations. Its function is to transfer the fiberglass tube sleeves to the support device 140, and after applying the hollow heat-shrink film, further send them to the heat-shrink device 170 for heat treatment. The transfer device 150 can perform linear transfer, horizontal transfer, lifting transfer, or flipping transfer according to a preset path to adapt to the production line layout and workpiece posture requirements. Specifically, the transfer device 150 may include a robotic arm, a robot gripper 1613, a sliding table transfer mechanism, or a chain conveyor transfer mechanism.

[0062] The heat shrinking device 170 is a station device used to heat a fiberglass tube sleeve that has been fitted with hollow heat shrink film. Upon heating, the heat shrink film shrinks uniformly along its outer circumference and tightly adheres to the surface of the fiberglass tube sleeve, thus forming a stable coating layer. The heat shrinking device 170 is positioned at a heat shrinking station accessible to the transfer device 150, which transfers the workpiece to this station for heating after completing the film fitting. Specifically, the heat shrinking device 170 may include at least one of an infrared heating box, a hot air heating chamber, or a radiant heating channel.

[0063] In the embodiment of this application, the fiberglass tube sleeve heat shrink film device is provided. During operation, the transfer device 150 delivers the fiberglass tube sleeve to the support device 140, where it is supported and positioned to keep the tube sleeve axis and position stable. The feeding device 120 conveys the hollow heat shrink film to the first processing device 130. The first mounting base 131 and the second mounting base 132 slide closer to each other. The cutting blade 133 and the blade holder 134 cooperate to complete the cutting. Then, the first adsorption device 1311 and the second adsorption device 1321 adsorb the two sides of the hollow heat shrink film respectively. The first mounting base 131 and the second mounting base 132 slide further apart, causing the hollow heat shrink film to open to form an approximately rectangular opening. The stretching device 160 moves to the first position. The two clamping components 161 clamp the portion of the hollow heat shrink film adsorbed by the first adsorption device 1311 and the second adsorption device 1321 respectively. The first adsorption device 1311 and the second adsorption device 1321 release the hollow heat shrink film. The stretching components slide along the feeding direction to the second position, gradually stretching the unfolded hollow heat shrink film and covering it on the outer surface of the fiberglass tube.

[0064] As the stretching assembly slides to the second position, the first processing device 130 is restarted. The first mounting base 131 and the second mounting base 132 slide closer to each other. The cutting blade 133 and the blade holder 134 cooperate to cut the hollow heat shrink film, completing the cutting of the previous product, and at the same time preparing for the unfolding of the next section of hollow heat shrink film.

[0065] The transfer device 150 delivers the film-coated fiberglass tube sleeve to the heat shrinking device 170 for heating, so that the heat shrink film shrinks evenly and adheres tightly to the outer circumference of the tube sleeve under heat.

[0066] Thus, by integrating the cutting and adsorption unfolding functions into the first processing device 130, on the one hand, the separate clamping equipment, airflow guide, or conveying unfolding mechanism in traditional processes are eliminated, reducing transmission components and control units, which helps to reduce the overall complexity and manufacturing cost. On the other hand, by applying negative pressure adsorption to both sides of the heat shrink film immediately after the cutting action is completed, the first processing device 130 can overcome the curling, adhesion, or sagging of the hollow heat shrink film caused by static electricity, its own weight, or elastic retraction, keeping it in a flat and open state. This provides a good premise for subsequent accurate covering, avoids positional deviation or posture disorder during intermediate transfer, and ensures that the unfolding center of the heat shrink film is aligned with the axis of the FRP tube, thereby improving the concentricity of the covering and the consistency of the wrapping, and reducing the scrap rate of the product.

[0067] refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, a second support 135 is provided on the first support 110, and the first processing device 130 is disposed on the second support 135. The second support 135 is a partial load-bearing frame disposed on the first support 110, used to provide an installation reference and motion support for the first processing device 130. Specifically, the second support 135 may be disposed between the feeding device 120 and the stretching device 160, and welded, screwed, or snapped to the first support 110 to form a more stable local working position.

[0068] The second bracket 135 is equipped with a first cylinder 136 and a second cylinder 137. The telescopic ends of the first cylinder 136 and the second cylinder 137 move relative to each other along a first direction. The first cylinder 136 and the second cylinder 137 are actuators that drive the first mounting base 131 and the second mounting base 132 to perform linear reciprocating motion, so that the first mounting base 131 and the second mounting base 132 move closer to each other along the first direction to complete the cutting action, and then reset and open after completion so that the hollow heat shrink film can continue to be transported and unfolded.

[0069] The first mounting base 131 is fixedly mounted on the telescopic end of the first cylinder 136, and the second mounting base 132 is fixedly mounted on the telescopic end of the second cylinder 137. That is, the first mounting base 131 and the second mounting base 132 move synchronously with the piston rod of their respective cylinders, thereby directly transmitting the linear driving force to the corresponding mounting base, ensuring that the cutting blade 133 and the blade holder 134 have sufficient force and repeatability when closed.

[0070] In this embodiment, the feeding device 120 conveys the hollow heat-shrink film to the first processing device 130. The first cylinder 136 and the second cylinder 137 operate synchronously, driving the first mounting base 131 and the second mounting base 132 to move closer to each other along a first direction. This causes the cutting blade 133 on the first mounting base 131 and the blade holder 134 on the second mounting base 132 to gradually close and cut the hollow heat-shrink film. This ensures a stable meshing process between the cutting blade 133 and the blade holder 134, preventing the cut edge from deviating, fraying, or tearing.

[0071] In some embodiments, both the first adsorption device 1311 and the second adsorption device 1321 are vacuum adsorption plates. A vacuum adsorption plate can be understood as a flat adsorption component with adsorption channels or vacuum through-holes, which stably adsorbs the hollow heat-shrink film on both sides after cutting, thereby suppressing rebound, displacement, or localized warping of the film material during separation and unfolding, and providing a uniform force base for subsequent stretching and sleeve application. The vacuum adsorption plate is typically installed on the opposing working surfaces of the first mounting base 131 and the second mounting base 132, and is located in the adjacent area of ​​the cutter 133 and the cutter holder 134, so that the film material can be immediately adsorbed and kept in an unfolded state after being cut.

[0072] Specifically, the vacuum adsorption plate can be fixedly connected to the mounting base by screws, positioning pins or sliding pressure plate 182, with the adsorption surface facing the hollow heat shrink film and the back side connected to the vacuum pipeline. The vacuum pipeline can be further connected to the negative pressure source, vacuum valve group and electromagnetic control element to realize the switching between adsorption and release.

[0073] Furthermore, since the vacuum adsorption plates on both sides are symmetrically arranged in the first direction and form an effective adsorption area in the second direction perpendicular to the feeding direction, the film material can be subjected to balanced force on both sides during cutting and unfolding, reducing the phenomenon of bulging in the middle or curling at the edges.

[0074] Alternatively, in some other embodiments of this application, the first adsorption device 1311 includes a plurality of suction cups arranged along the second direction, and the second adsorption device 1321 includes a plurality of suction cups arranged along the second direction. The plurality of suction cups are used for dot-matrix adsorption and fixation of the corresponding surface of the hollow heat-shrinkable film. The evenly distributed arrangement of the plurality of suction cups along the second direction can form multiple adsorption points in the width direction of the film material, thereby improving the adaptability to film materials of different widths without significantly increasing the structural thickness.

[0075] Specifically, multiple suction cups can be installed on the adsorption mounting strips or adsorption brackets of the first mounting base 131 and the second mounting base 132, and are connected to the negative pressure source through their respective vacuum branches, with the open end of the suction cup facing the heat shrink film surface.

[0076] In this embodiment, since multiple suction cups are distributed along the second direction, they can form discrete but continuous adsorption constraints on the surface of the membrane material. Therefore, the flatness of the membrane material can be maintained when it is unfolded, and it is easy to detach quickly during subsequent release, reducing the secondary deformation caused by residual stress in the membrane layer.

[0077] In some embodiments, along the feeding direction of the hollow heat-shrinkable film, the first adsorption device 1311 is located on the side of the cutter 133 facing the feeding device 120.

[0078] In this application, the first adsorption device 1311 is a component used to form negative pressure adsorption or mechanical pressing on one side surface of the hollow heat shrink film along the first direction. Its function is to stably clamp the end of the film material in time after the cutter 133 completes the cutting action, so as to facilitate subsequent unfolding, pulling and sleeve operation. Since the first adsorption device 1311 is arranged on the side of the cutter 133 facing the feeding device 120, that is, it is located upstream of the cutter 133 along the film feeding direction, after the hollow heat shrink film is transported to the cutting station and the cutting is completed, the first adsorption device 1311 directly corresponds to the end of the film material without the need for an additional intermediate transfer mechanism, which helps to reduce the probability of the heat shrink film rebounding, shifting or collapsing after cutting.

[0079] In one possible embodiment, the first adsorption device 1311 can be mounted on the first mounting base 131 and maintain a coaxial or nearly coaxial cooperation with the cutter 133, with its adsorption surface facing the corresponding sidewall of the hollow heat shrink film; in other exemplary embodiments, the first adsorption device 1311 can also be fixed to the downstream side of the first processing device 130 by a support plate, mounting block or guide frame, and together with the second adsorption device 1321, form symmetrical adsorption on both sides of the film material to improve the flatness and positioning accuracy after cutting.

[0080] refer to Figure 2 and Figure 4In some embodiments, the first support 110 is provided with a synchronous belt device 111 extending along the feeding direction of the hollow heat-shrinkable film, and the stretching device 160 includes a third support 162, which is drively connected to the synchronous belt device 111. The synchronous belt device 111 is a transmission mechanism used to convert the rotational motion of the drive device into linear reciprocating motion of the third support 162 along the feeding direction, providing a stable, continuous, and controllable moving foundation for the stretching device 160. This allows the stretching device 160 to smoothly move to a second position along the feeding direction of the hollow heat-shrinkable film after clamping the unfolded hollow heat-shrinkable film at the first position, thereby achieving the stretching and application of the film material. The synchronous belt device 111 may include a synchronous belt, a driving pulley, a driven pulley, a tensioning pulley, and a drive motor. The third support 162 is connected to the synchronous belt. The third support 162 can adopt a gantry frame, a plate slide, or a box-shaped skeleton structure, and its connection position with the synchronous belt device 111 corresponds to the force-bearing section of the synchronous belt to ensure symmetrical force distribution during movement.

[0081] The clamping assembly 161 includes a first clamping member 1611 and a second clamping member 1612. The first clamping member 1611 and the second clamping member 1612 are respectively located on both sides of the third support 162. The first clamping member 1611 and the second clamping member 1612 are arranged opposite to each other along a first direction. The first clamping member 1611 is used to clamp the hollow heat-shrinkable film adsorbed by the first adsorption device 1311, and the second clamping member 1612 is used to clamp the hollow heat-shrinkable film adsorbed by the second adsorption device 1321. That is, the first clamping member 1611 and the second clamping member 1612 are respectively used to clamp the upper and lower sides of the hollow heat-shrinkable film after it has been adsorbed and unfolded by the first adsorption device 1311 and the second adsorption device 1321, so that when the third support 162 moves, it synchronously drives the film material to be conveyed forward as a whole and completes the sleeve action.

[0082] The first clamping member 1611 and the second clamping member 1612 can be opened and closed by a cylinder drive, a spring reset or an electric actuator.

[0083] Furthermore, the first clamping member 1611 includes at least two grippers 1613 arranged along the second direction, and the second clamping member 1612 includes at least two grippers 1613 arranged along the second direction. By using multiple grippers 1613 arranged along the second direction to clamp the upper and lower sides of the hollow heat-shrink film, a segmented, multi-point clamping structure is formed. This structure is used to accommodate hollow heat-shrink films of different widths and to distribute clamping stress, avoiding localized indentations, film edge curling, or uneven stress.

[0084] Specifically, since both the first clamping member 1611 and the second clamping member 1612 include at least two jaws 1613, the heat-shrinkable film clamped between the two jaws 1613 forms a straight structure, and the opening area formed after unfolding is large, so as to match the outer diameter of the glass sleeve.

[0085] In some embodiments, the third bracket 162 is provided with two third mounting seats 1621 that are opposite each other in the second direction, and each of the two third mounting seats 1621 is provided with a support member 1622 that slides relative to each other in the second direction.

[0086] In this embodiment, the third bracket 162 is a support frame that carries and installs the stretching structure, and it is used to provide a stable installation reference and force support on the movement path of the stretching device 160. Two third mounting seats are respectively disposed on opposite sides of the third bracket 162 along the second direction, and the two third mounting seats, the first clamping member 1611 and the second clamping member 1612 together define the working space for the heat shrink film to be inserted and unfolded.

[0087] The third mounting base 1621 is used to mount and guide the support member 1622, allowing the support member 1622 to slide towards or away from each other along the second direction, thereby laterally expanding the hollow heat-shrink film in a clamped or initially unfolded state. Specifically, the third mounting base 1621 and the support member 1622 can be installed and fitted together via guide rails, slides, linear bearings, or adjustable connecting plates, and their relative movement can be driven by cylinders, lead screws, push-pull mechanisms, or electric slides.

[0088] In this embodiment, after the first processing device 130 cuts the hollow heat shrink film, the first adsorption device 1311 and the second adsorption device 1321 adsorb the heat shrink film and initially unfold it. The stretching device 160 moves to the first position. At this time, the gripper 1613 of the clamping component 161 and the support member are inserted into the unfolding opening of the heat shrink film. The two support members move away from each other and stretch the hollow heat shrink film.

[0089] refer to Figure 4 Furthermore, the support member 1622 includes at least two support rods 1622a spaced apart along the first direction, extending along the feeding direction of the hollow heat-shrinkable film. Multiple support rods provide circumferential segmented support to the heat-shrinkable film, gradually establishing a stable opening channel in the longitudinal direction of the film cavity. This facilitates the smooth entry of the fiberglass tube sleeve into the film cavity and completion of the sleeve installation during subsequent transport. Since the relative sliding direction of the support member 1622 matches the opening direction of the film opening, the multiple support rods can apply a relatively uniform supporting force to the film material. Therefore, during the installation process, the probability of film edge folding, local compression, and eccentric insertion can be effectively reduced, thereby lowering the risk of wrinkles, uneven wrapping, or localized suspension after heat shrinking.

[0090] In one specific embodiment, the first clamping member 1611 may include two grippers 1613 arranged along a second direction, the second clamping member 1612 may include two grippers 1613 arranged along a second direction, and both extending members may include two extending rods arranged at intervals along a first direction. When the stretching device 160 clamps the hollow heat-shrinkable film at the first position, the hollow heat-shrinkable film is stretched into an octagon.

[0091] refer to Figure 5 In some embodiments, the fiberglass tube heat shrink film device further includes a film pressing device 180, which is located between the feeding device 120 and the first processing device 130. The film pressing device 180 is a pre-shaping mechanism set on the film feeding path, used to guide, flatten and partially pre-press the film surface before the hollow heat shrink film enters the first processing device 130, so that the film material maintains a relatively stable flat state during the subsequent cutting and adsorption unfolding process.

[0092] The film pressing device 180 includes a fourth support 181, a pressure plate 182 and a conveying roller 183. The fourth support 181 is fixedly installed on the first support 110, the conveying roller 183 is fixedly installed on the fourth support 181, and the pressure plate 182 is movably installed on the fourth support 181 along a first direction.

[0093] The fourth support 181 serves as the supporting frame for the film pressing device 180, maintaining the conveyor roller 183 and the pressure plate 182 within the same working area and providing an installation reference. It can be fixedly connected to the first support 110 via bolts, welding, or locating pins to ensure the relative accuracy of the film pressing position with respect to the feeding device 120 and the first processing device 130. The conveyor roller 183 is a rotating guide that contacts the film material. After being installed on the fourth support 181, it typically maintains a fixed axis. After being output from the feeding device 120, the film material can first pass through the surface of the conveyor roller 183 to achieve low-friction steering or support, thereby reducing the risk of film material displacement and abrasion caused by tension fluctuations. The pressure plate 182 is a pressing component that can move along the first direction. It is installed on the fourth bracket 181 through a slider, guide groove, lead screw pair, cylinder push rod or similar linear drive mechanism so as to adjust the pressing position and pressing force according to different film thicknesses, different film widths and different production cycles, and apply controllable pressure to the film surface when the film material passes through, so that the curls, wrinkles and curled edges in the film layer are gradually flattened.

[0094] When the system starts, the hollow heat-shrinkable film is continuously fed out by the feeding device 120 and first passes through the station of the pressing device 180. The film material is supported and guided by the conveying roller 183 and moves forward stably. At the same time, the pressure plate 182 is adjusted to an appropriate position in the first direction and applies a uniform pressing force to the film surface, so that the film material completes preliminary leveling and posture correction before entering the first processing device 130. Since the pressure plate 182 and the conveying roller 183 together limit the passage space of the film material, the film material is less likely to have local warping, edge folding or conveying sway in this area. This allows the cutting blade 133 and the blade holder 134 in the subsequent first processing device 130 to complete the cutting in a relatively stable film surface state. The first adsorption device 1311 and the second adsorption device 1321 can also more easily form uniform adsorption on both sides of the film material. In this way, the film pressing device 180 can improve the stability of film material conveying and the flatness before unfolding without adding too many complex linkage mechanisms. This is conducive to improving cutting accuracy, adsorption reliability and the consistency of subsequent film covering and heat shrinking, making the whole machine more suitable for continuous, high-frequency fiberglass tube heat shrink film processing scenarios.

[0095] refer to Figure 1 In some embodiments, the transfer device 150 includes a robotic arm. The robotic arm is an actuator used to automatically grasp, transport, and place fiberglass tube sleeves between different workstations. It achieves the transfer of workpieces between workstations such as the support device 140 and the heat-shrink device 170 through multi-degree-of-freedom motion, thereby replacing manual handling. The function of the robotic arm is to stably grasp and precisely transfer the fiberglass tube sleeves, ensuring that their posture remains essentially constant during entry into the support workstation, completion of the sleeve application, and transfer to the heat-shrink workstation, avoiding eccentricity, collisions, and positional deviations caused by manual handling or simple pushing.

[0096] For example, the robot arm is installed on the side, front or above the first support 110 and fixed to the frame or independent support by base bolts. The working end of the robot arm is set to correspond to the gripping area of ​​the fiberglass tube sleeve, and the end effector forms an adaptive contact or adsorption fit with the outer peripheral surface or end of the workpiece so as to form a reliable constraint during gripping, lifting, translation and placement.

[0097] Specifically, robotic arms can include six-axis articulated robots, SCARA (Selective Compliance Assembly Robot Arm) robotic arms, Cartesian coordinate robotic arms, or swing-arm transfer robotic arms. Among them, six-axis articulated robots are suitable for complex spatial posture adjustments, SCARA robotic arms are suitable for rapid in-plane transport, Cartesian coordinate robotic arms are suitable for linear transport with high repeatability, and swing-arm transfer robotic arms are suitable for completing reciprocating transport within a short cycle time.

[0098] In one production process, the robotic arm moves to the predetermined gripping station based on the position signal from the control system. It then stably grips the fiberglass tube sleeve to be transferred from the loading station or intermediate buffer station, and transfers it to the support device 140 along a set trajectory for accurate placement. After the hollow heat-shrink film is cut, unfolded, and fitted onto the outside of the fiberglass tube sleeve by the stretching device 160, the robotic arm again assists in transferring the covered fiberglass tube sleeve to the heat-shrinking device 170 for heat shrinking. Because the robotic arm can repeatedly perform gripping, handling, and positioning actions along a predetermined path, it reduces errors caused by human intervention and minimizes the risk of workpiece skewing, collisions, and drops during transfer. This improves the consistency of the fiberglass tube sleeve in terms of film placement, entry into the heat-shrinking area, and final appearance after shrinkage.

[0099] refer to Figure 1 In some embodiments, the heat shrinking device 170 includes an infrared heating device 171, which is a heating component for outputting infrared energy to the heat shrink film passing through its radiation range. Its function is to rapidly heat up the hollow heat shrink film that has been fitted onto the outer periphery of the fiberglass tube without relying on a large-scale hot air circulation, so that the film material can shrink and adhere tightly to the surface of the tube within a predetermined time, thereby speeding up the production pace.

[0100] An infrared heating device 171 is mounted on a fifth support 172, and a transmission device 173 is mounted on the fifth support 172. The infrared heating device 171 faces the transmission device 173.

[0101] The conveying device 173 is used to transport the heat-shrinkable fiberglass tube sleeve into the infrared heating area and maintain the continuous movement or intermittent positioning of the workpiece during the heating process to ensure uniform heating of the heat-shrinkable film. The infrared heating device 171 is mounted on the fifth support 172 and faces the conveying device 173, so that its radiation direction directly covers the area through which the workpiece passes by the conveying device 173, forming a directional heating station and preventing heat from diffusing into unrelated areas and causing heat loss.

[0102] For example, the infrared heating device 171 can be any one or a combination of infrared lamp array, quartz infrared tube, and ceramic infrared heating plate. It can also be equipped with a metal reflector to improve the utilization rate of radiation energy, and work in conjunction with a high-temperature resistant insulating support, wires and temperature control elements to achieve stable operation.

[0103] refer to Figure 6 Secondly, embodiments of this application also provide a method for processing heat-shrink film on fiberglass pipe sleeves, applied to the aforementioned heat-shrink film device for fiberglass pipe sleeves, the method comprising the following steps:

[0104] The transfer device 150 transfers the fiberglass tube sleeve to the support device 140 for support and fixation;

[0105] The first processing device 130 cuts hollow heat shrink film;

[0106] The first adsorption device 1311 and the second adsorption device 1321 adsorb and unfold the hollow heat shrink film;

[0107] The stretching device 160 moves to the first position, and the clamping assembly 161 clamps the unfolded hollow heat shrink film.

[0108] The first adsorption device 1311 and the second adsorption device 1321 release the hollow heat shrink film;

[0109] The stretching device 160 moves to the second position, the first processing device 130 cuts the hollow heat shrink film, and the unfolded hollow heat shrink film is fitted onto the fiberglass tube sleeve.

[0110] The transfer device 150 transfers the fiberglass tube sleeve fitted with hollow heat-shrink film to the heat-shrink device 170 for heating.

[0111] The fiberglass tube sleeve heat shrink film processing method of this application first uses a transfer device 150 to transfer the fiberglass tube sleeve to a support device 140 for support and fixation, ensuring that the fiberglass tube sleeve to be covered is accurately and stably positioned at the film-covering station, providing a benchmark for the accurate subsequent heat shrink film application. A first processing device 130 cuts the hollow heat shrink film, and a first adsorption device 1311 and a second adsorption device 1321 adsorb and unfold the hollow heat shrink film. Immediately after cutting, negative pressure is applied to both sides of the heat shrink film along its width, forcibly flattening it from a naturally relaxed or curled state into an approximately cylindrical structure. This effectively overcomes the inherent defects of heat shrink film, such as its thinness, strong static electricity, and tendency to stick / sag, eliminating the need for an additional unfolding mechanism, simplifying the processing flow, and ensuring a flat film surface.

[0112] Then, the stretching device 160 moves to the first position, clamps the unfolded heat-shrink film, and moves to the second position to fit it onto the glass tube sleeve. During this process, the first processing device 130 restarts the cutting abrasive when the heat-shrink film is stretched to the predetermined length. This links the cutting action with the sleeve-fitting action, avoiding redundant operations and improving production cycle time.

[0113] Finally, the fitted pipe is placed in the heat-shrink station, where heating causes the heat-shrink film to shrink and adhere tightly to the pipe surface. This forms a complete, uniform, and robust protective layer, improving the FRP pipe's weather resistance, scratch resistance, and appearance quality.

[0114] In this way, from tube feeding, membrane cutting, adsorption and unfolding, stretching and shrinking to heat shrink molding, each step is completed by a dedicated mechanism without human intervention, which helps to improve production efficiency and consistency.

[0115] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A heat-shrink film device for fiberglass pipe sleeves, characterized in that, include: First support (110); Feeding device (120) is used to convey hollow heat shrink film; A first processing device (130) is disposed on the first support (110). The first processing device (130) includes a first mounting base (131) and a second mounting base (132). The first mounting base (131) and the second mounting base (132) slide relative to each other along a first direction. The first direction is perpendicular to the feeding direction of the hollow heat shrink film. The first mounting base (131) is provided with a cutting blade (133), and the second mounting base (132) is provided with a blade holder (134) corresponding to the cutting blade (133). The first mounting base (131) is provided with a first adsorption device (1311) for adsorbing one side surface of the hollow heat shrink film along the first direction, and the second mounting base (132) is provided with a second adsorption device (1321) for adsorbing the other side surface of the hollow heat shrink film along the first direction. Support device (140), provided on the first bracket (110), is used to support the fiberglass pipe sleeve; A transfer device (150) is used to transfer the fiberglass tube sleeve to the support device (140). A stretching device (160) is adapted to slide between a first position and a second position along the feeding direction of the hollow heat shrink film. The stretching device (160) includes a clamping assembly (161). When the stretching device (160) is in the first position, the clamping assembly (161) clamps the hollow heat shrink film unfolded on the first processing device (130). When the stretching device (160) is in the second position, the unfolded hollow heat shrink film is fitted onto the fiberglass tube sleeve. The heat shrinking device (170) and the transfer device (150) are also used to transfer the fiberglass tube sleeve covered with hollow heat shrink film to the heat shrinking device (170), and the heat shrinking device (170) is used to heat the hollow heat shrink film.

2. The fiberglass tube heat shrink film device according to claim 1, characterized in that, The first support (110) is provided with a second support (135), the first processing device (130) is provided on the second support (135), the second support (135) is provided with a first cylinder (136) and a second cylinder (137), and the extension and retraction ends of the first cylinder (136) and the second cylinder (137) move relative to each other along the first direction; The first mounting base (131) is fixedly disposed on the telescopic end of the first cylinder (136), and the second mounting base (132) is fixedly disposed on the telescopic end of the second cylinder (137).

3. The fiberglass tube sleeve heat shrink film device according to claim 1, characterized in that, Both the first adsorption device (1311) and the second adsorption device (1321) are vacuum adsorption plates; or, The first adsorption device (1311) includes a plurality of suction cups arranged along the second direction, and the second adsorption device (1321) includes a plurality of suction cups arranged along the second direction.

4. The fiberglass tube sleeve heat shrink film device according to claim 1, characterized in that, Along the feeding direction of the hollow heat shrink film, the first adsorption device (1311) is located on the side of the cutter (133) facing the feeding device (120).

5. The fiberglass tube heat shrink film device according to claim 1, characterized in that, The first support (110) is provided with a synchronous belt device (111) extending along the feeding direction of the hollow heat shrink film. The stretching device (160) includes a third support (162), which is connected to the synchronous belt device (111) in a transmission manner. The clamping assembly (161) includes a first clamping member (1611) and a second clamping member (1612). The first clamping member (1611) and the second clamping member (1612) are arranged opposite to each other along the first direction. The first clamping member (1611) is used to clamp the hollow heat shrink film adsorbed by the first adsorption device (1311), and the second clamping member (1612) is used to clamp the hollow heat shrink film adsorbed by the second adsorption device (1321). And / or, the first clamping member (1611) includes at least two jaws (1613) arranged in the second direction, and the second clamping member (1612) includes at least two jaws (1613) arranged in the second direction.

6. The fiberglass tube sleeve heat shrink film device according to claim 5, characterized in that, The third bracket (162) is provided with two third mounting seats that are opposite each other along the second direction, and each of the two third mounting seats is provided with a support member that slides relative to each other along the second direction; And / or, the support member includes at least two support rods spaced apart along the first direction.

7. The fiberglass tube sleeve heat shrink film device according to claim 1, characterized in that, Also includes: A film pressing device (180) is located between the feeding device (120) and the first processing device (130). The film pressing device (180) includes a fourth support (181), a pressure plate (182) and a conveying roller (183). The fourth support (181) is fixedly installed on the first support (110), the conveying roller (183) is fixedly installed on the fourth support (181), and the pressure plate (182) is movably installed on the fourth support (181) along the first direction.

8. The fiberglass tube sleeve heat shrink film device according to claim 1, characterized in that, The transfer device (150) includes a robotic arm.

9. The fiberglass tube sleeve heat shrink film device according to claim 1, characterized in that, The heat shrinking device (170) includes an infrared heating device (171), which is located on a fifth bracket (172). A transmission device (173) is provided on the fifth bracket (172), and the infrared heating device (171) faces the transmission device (173).

10. A method for processing heat-shrink film onto fiberglass pipe sleeves, characterized in that, The method, applied to the heat-shrink film apparatus for fiberglass tube sleeves as described in any one of claims 1-9, comprises the following steps: The transfer device (150) transfers the fiberglass pipe sleeve to the support device (140) for support and fixation; The first processing device (130) cuts hollow heat shrink film; The first adsorption device (1311) and the second adsorption device (1321) adsorb the hollow heat shrink film and unfold it; The stretching device (160) moves to the first position, and the clamping assembly (161) clamps the unfolded hollow heat shrink film; The first adsorption device (1311) and the second adsorption device (1321) release the hollow heat shrink film; The stretching device (160) moves to the second position and places the unfolded hollow heat shrink film onto the fiberglass tube sleeve; The transfer device (150) transfers the fiberglass tube sleeve fitted with hollow heat shrink film to the heat shrink device (170) for heating.

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