High efficiency heat shrink machine
By using a spring device and a fan blade switch control circuit in a high-efficiency heat shrink machine, on-demand heating is achieved, solving the problem of hot air blowing out of thin air, reducing energy consumption and improving thermal efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- RUIAN XINYUAN PACKAGING MACHINERY EQUIP
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-21
AI Technical Summary
Existing high-efficiency heat shrink machines suffer from hot air blowing during periods when items are not placed in or during transport intervals, resulting in high energy consumption and low thermal efficiency.
By employing a combination of multiple spring-loaded devices and fan blade switches and control circuits, the hot air blower is started and stopped by a trigger signal from an object, thus achieving on-demand heating.
It effectively avoids heat energy waste, reduces equipment energy consumption, and improves thermal efficiency and operating costs.
Smart Images
Figure CN224529200U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat shrink equipment technology, and in particular to a high-efficiency heat shrink machine. Background Technology
[0002] A heat shrink machine, also known as a heat shrink packaging machine, is an industrial device used for heat shrink packaging of items. It typically uses hot air to heat and shrink the heat shrink film covering the surface of the item, tightly wrapping it around the surface of the item to achieve the purposes of protection, aesthetics, moisture prevention, dust prevention, and prevention of spillage.
[0003] Existing high-efficiency heat shrink machines typically employ a fixed hot air output structure or a multi-segment constant heating method. When items are not being placed in the machine or during transport intervals, hot air may blow dry, making it impossible to dynamically adjust the hot air flow based on the position of the items being processed. This results in high energy consumption and low thermal efficiency. This non-on-demand heating method not only increases operating costs but may also shorten the lifespan of the hot air machine. Summary of the Invention
[0004] This utility model discloses a high-efficiency heat shrink machine, which aims to solve the problems of hot air blowing, high energy consumption and low thermal efficiency in existing high-efficiency heat shrink machines.
[0005] The technical solution of this utility model is as follows: A high-efficiency heat shrink machine includes: a conveyor belt for defining the conveying path of an item; a hot air blower; multiple spring clip devices arranged along the conveying path, each spring clip device generating a trigger signal when triggered by an item on the conveying path; multiple fan blade switches corresponding to the multiple spring clip devices; and a control circuit electrically connected to the multiple spring clip devices, the hot air blower, and the multiple fan blade switches; wherein, the control circuit is used to control the hot air blower to start when it receives the trigger signal sent by any of the spring clip devices, and to control the fan blade switch corresponding to the spring clip device that sent the trigger signal to open; the control circuit is also used to control the hot air blower to stop working when none of the spring clip devices are triggered.
[0006] Furthermore, according to the aforementioned high-efficiency heat shrink machine, each spring device includes a rotatable rotating shaft; it also includes a worm and a handle connected to the worm, and a worm wheel is fixedly connected to the rotating shaft, the worm wheel meshing with the worm.
[0007] Preferably, according to the aforementioned high-efficiency heat shrink machine, the plurality of spring devices are arranged in pairs along both sides of the article conveying path; each spring device includes a spring that is inclined toward the center line of the article conveying path.
[0008] More specifically, in some embodiments, according to the aforementioned high-efficiency heat shrink machine, the control circuit includes a relay; a plurality of the spring devices are connected in parallel to the control terminal of the relay, and the output terminal of the relay is electrically connected to the hot air blower.
[0009] Furthermore, according to the aforementioned high-efficiency heat shrink machine, each spring device includes a mounting base and a contact fixed on the mounting base; the spring device also includes a rotating shaft and a spring, the rotating shaft being rotatably mounted on the mounting base and the spring being fixed to the rotating shaft; the spring rotates and contacts the contact when triggered by the article to generate the trigger signal.
[0010] Preferably, according to the aforementioned high-efficiency heat shrink machine, each set of the spring device controls at least one fan blade switch.
[0011] Furthermore, according to the aforementioned high-efficiency heat shrink machine, it also includes multiple locking screws, with a corresponding locking screw on each rotating shaft for locking and braking the rotating shaft.
[0012] Preferably, the aforementioned high-efficiency heat shrink machine further includes a worm gear housing, wherein the worm gear and the worm are disposed within the worm gear housing.
[0013] This utility model also discloses a high-efficiency heat shrink machine, including a machine body shell, and the conveyor belt, the hot air blower, the multiple spring clip devices and the multiple fan blade switches are all disposed inside the machine body shell.
[0014] Furthermore, according to the aforementioned high-efficiency heat shrink machine, the outer casing of the machine body is provided with an air inlet and an air outlet.
[0015] This utility model provides a high-efficiency heat shrink machine. By incorporating multiple spring-loaded devices along the item conveying path, multiple fan blade switches, and a control circuit electrically connected to them and the hot air blower, the machine enables on-demand start and stop of the hot air blower and controls the opening and closing of the corresponding fan blade switches based on the item's position. Specifically, when an item enters the conveying path and triggers any spring-loaded device, the control circuit receives a trigger signal, immediately starts the hot air blower, and opens the fan blade switch corresponding to the triggered spring-loaded device, ensuring that hot air is only output when there is an item requiring processing. When all spring-loaded devices are not triggered, the control circuit controls the hot air blower to stop operating.
[0016] This invention effectively solves the problem of air blowing, avoiding the waste of heat energy during the period before items are placed or during item transfer intervals. It reduces equipment energy consumption, improves thermal efficiency, and thus lowers operating costs. Attached Figure Description
[0017] Figure 1This is a front view structural diagram of a high-efficiency heat shrink machine provided in an embodiment of this application;
[0018] Figure 2 This is a side view structural schematic diagram of a high-efficiency heat shrink machine provided in an embodiment of this application;
[0019] Figure 3 This is a schematic diagram of the internal structure of a high-efficiency heat shrink machine provided in an embodiment of this application;
[0020] Figure 4 This application provides a side view of the internal structure of a high-efficiency heat shrink machine according to an embodiment of the present application.
[0021] Figure 5 A front view of the internal structure of a high-efficiency heat shrink machine provided in this application embodiment;
[0022] Figure 6 This is a schematic diagram of the internal structure of a high-efficiency heat shrink machine from another direction, provided in an embodiment of this application.
[0023] Figure 7 for Figure 6 A schematic diagram of the A-zone structure of a high-efficiency heat shrink machine provided in this application embodiment;
[0024] Figure 8 for Figure 6 A schematic diagram of the B-zone structure of a high-efficiency heat shrink machine provided in this application embodiment;
[0025] Figure 9 for Figure 6 A schematic diagram of the C-section structure of a high-efficiency heat shrink machine provided in this application embodiment;
[0026] Figure 10 A simplified circuit diagram of a high-efficiency heat shrink machine provided in this application embodiment;
[0027] Attached icon numbers: 1. Conveyor belt; 2. Control switch; 21. Machine casing; 3. Air inlet; 4. Air outlet; 51. Spring; 52. Mounting base; 53. Contact; 54. Rotating shaft; 55. Locking screw; 61. Worm gear housing; 62. Throttle; 63. Worm gear; 64. Worm; 7. Relay; 8. Fan blade. Detailed Implementation
[0028] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application.
[0029] See Figure 1 Traditional high-efficiency heat shrink machines typically employ a fixed hot air output structure. When items are not placed in the machine or during transport intervals, hot air may blow out of the machine without being put in, making it impossible to dynamically adjust the hot air according to the position of the items to be processed. This results in high energy consumption and low thermal efficiency.
[0030] In response, this application proposes a high-efficiency heat shrink machine that aims to dynamically control the output of hot air.
[0031] This embodiment discloses a high-efficiency heat shrink machine, which is mainly used for heat shrink packaging of items. The high-efficiency heat shrink machine includes a conveyor belt 1, a hot air blower, multiple spring clip devices, multiple fan blade switches 8, and a control circuit.
[0032] Specifically, the conveyor belt 1 is used to define a conveying path for an item. The conveyor belt 1 can be any conveying mechanism capable of carrying and stably transporting items, such as a mesh belt, chain conveyor belt, or roller conveyor belt. Its main function is to ensure that the items can pass smoothly through the heating area of a high-efficiency heat shrink machine.
[0033] The hot air blower is used to generate and deliver hot air to heat and shrink a thin film on the surface of an article. The hot air blower may include a heating element and a fan; the heating element heats the air, and the fan blows the hot air toward the article.
[0034] The plurality of spring-loaded devices are arranged along the article conveying path. Each spring-loaded device is used to generate a trigger signal when triggered by an article on the article conveying path. These spring-loaded devices can be mechanical contact switches, photoelectric sensors, or proximity sensors, and their function is to accurately detect the position of the article on the conveying path.
[0035] The plurality of fan blade switches 8 are correspondingly configured with the plurality of spring contacts. Each fan blade switch 8 is typically located at the hot air outlet and is used to control the on / off state or flow rate of local hot air. This one-to-one correspondence ensures that when the spring contact device in a certain area is triggered, only the fan blade switch 8 in the corresponding area is opened, thereby achieving localized directional delivery of hot air. For example, the fan blade switch 8 can be a rotatable baffle, which opens or closes the hot air passage by rotation.
[0036] The control circuit is electrically connected to the plurality of spring clip devices, the hot air blower, and the plurality of fan blade switches 8. This control circuit is the core control unit of the entire high-efficiency heat shrink machine, responsible for receiving signals from the spring clip devices and controlling the hot air blower and fan blade switches 8 based on these signals. The control circuit can be composed of a microcontroller, a programmable logic controller (PLC), or an application-specific integrated circuit (ASIC), etc., and has preset control logic within it.
[0037] The control circuit, upon receiving a trigger signal from any of the spring-loaded devices, controls the hot air blower to start and opens the fan blade switch 8 corresponding to the spring-loaded device that sent the trigger signal. Thus, when an item enters the heat-shrink area and triggers a spring-loaded device, the hot air blower immediately starts, and only the fan blade switch 8 in the area where the item is located is opened, achieving precise hot air delivery. This contrasts sharply with the continuous blowing mode of traditional high-efficiency heat shrink machines, significantly reducing the phenomenon of hot air blowing without contact and improving energy efficiency.
[0038] Furthermore, the control circuit is also used to control the hot air blower to stop working when none of the spring devices are triggered.
[0039] See Figures 1 to 10 The working process of this high-efficiency heat shrink machine is as follows:
[0040] First, when a high-efficiency heat shrink machine is in standby mode, conveyor belt 1 may be running or stopped, but since no items have entered the heating area, all the spring devices are not triggered. At this time, the control circuit detects that none of the spring devices have sent a trigger signal, and therefore controls the hot air blower to remain stopped. This ensures that no hot air is generated or wasted when no items are passing through, thus achieving energy savings.
[0041] Next, when an item to be shrunk is placed on conveyor belt 1 and moves into the heat shrink area with the conveyor belt 1, the item will first contact and trigger the first spring device. Once the spring device is triggered, it will immediately send a trigger signal to the control circuit.
[0042] Upon receiving this trigger signal, the control circuit responds quickly. It immediately sends a start command to the hot air blower, causing it to begin operating and generating hot air. Simultaneously, the control circuit identifies the fan blade switch 8 corresponding to the triggered spring device and sends an open command to it. Thus, the hot air generated by the hot air blown by the hot air blown precisely towards the location of the object through the opened fan blade switch 8.
[0043] As the item continues to move forward on conveyor belt 1, it sequentially triggers subsequent spring devices. Each time an item triggers a new spring device, the control circuit repeats the above process: ensuring the hot air blower continues to run and activating the fan blade switch 8 corresponding to the currently triggered spring device. Simultaneously, when the item leaves the detection range of a spring device, that spring device returns to its untriggered state, and the control circuit can accordingly control its corresponding fan blade switch 8 to close, thus achieving "movement with the item" for the hot air. This ensures that the hot air is always concentrated at the item's current position, further optimizing the heating effect and energy utilization.
[0044] Finally, once the item has completely passed through the detection areas of all the spring devices and left the heat shrink area, all the spring devices will return to their untriggered state. The control circuit will detect that none of the spring devices have sent a trigger signal, at which point it will send a stop command to the hot air blower, causing the hot air blower to stop working.
[0045] In some embodiments described above in this application, the spring device is used to generate a trigger signal when triggered by an item. However, in practical applications, items of different sizes or shapes may require the spring device to have a certain degree of adjustability to ensure the accuracy and reliability of triggering and avoid false triggering or failure to trigger due to differences in item size. Therefore, this application further proposes to optimize the structure of the spring device to make it easily adjustable, thereby improving the adaptability of a high-efficiency heat shrink machine to different items.
[0046] Each of the aforementioned spring devices is designed to include a rotatable rotating shaft 54. The rotating shaft 54 is designed to provide a rotatable base for the spring device to facilitate adjustment of the trigger position or angle of the spring device. To achieve precise and stable adjustment of the rotating shaft 54, the spring device includes a rotatable rotating shaft 54; a worm gear 63 is fixedly connected to the rotating shaft 54, and the worm gears 63 on several rotating shafts (54) are axially engaged with a worm 64, the worm 64 being connected to a throttle handle 62.
[0047] This worm gear transmission mechanism configuration allows for uniform and precise adjustment of all rotating shafts 54 by rotating the throttle 62. Furthermore, due to the self-locking characteristic of the worm gear transmission, once the adjustment is in place, the position of the rotating shaft 54 can be stably maintained.
[0048] Through the above technical solution, the adjustability of the spring device is significantly improved. The introduction of the worm gear transmission mechanism allows for precise and stable position adjustment of all spring devices on one side with just a simple rotation of the shaft, thus enabling better adaptation to items of different sizes and shapes.
[0049] In some preferred embodiments, when a high-efficiency heat shrink machine needs to handle items of different widths, the operator can adjust the angle of the rotating shaft 54 in the spring device by turning the throttle 62. For example, for wider items, the spring device can be adjusted to be triggered earlier or later, or its tilt angle can be adjusted to ensure that the item can pass smoothly and accurately contact the spring.
[0050] In some embodiments described above in this application, the plurality of spring devices are arranged along the article conveying path. However, for articles of different widths or shapes, a single-sided spring device may not achieve stable and reliable triggering, or precise alignment may be required to ensure triggering, which may have limitations in practical applications. Therefore, this application further proposes an optimized arrangement of the spring devices to improve the reliability and adaptability of article triggering.
[0051] Specifically, the plurality of spring devices are configured to be arranged in pairs along both sides of the item conveying path. This means that in the lateral direction of the item conveying path, each pair of spring devices is located on both sides of the path, thereby enabling the simultaneous sensing of passing items from both sides.
[0052] As an item moves along the conveyor path on conveyor belt 1, regardless of its width, once it enters the sensing range of the spring device, its side will contact at least one, typically one or both, of the two springs 51 arranged in pairs. Because the springs 51 are inclined towards the centerline of the path, even if the item is relatively small, its edges can more easily contact the inclined springs 51, causing them to rotate and generate a trigger signal. This double-sided, inclined configuration significantly increases the effective contact area and contact probability between the item and the spring device, thereby ensuring reliable generation of the trigger signal and avoiding missed triggering due to item size or positional deviations.
[0053] In the above embodiments of this application, multiple spring contacts are directly connected to the control circuit. When the number of spring contacts is large, the load on the control circuit will increase accordingly, which may lead to unstable operation of the control circuit. To address this, this application proposes an improvement scheme, using a relay 7 as an intermediate control element to reduce the load on the control circuit and improve the reliability of the system.
[0054] In this system, relay 7 amplifies the signal, using a smaller control current to control a larger operating current, thus achieving effective control of the hot air blower. Multiple contact springs are connected in parallel to the control terminal of relay 7, meaning that whenever any contact spring is triggered, the control terminal of relay 7 receives a signal, thereby starting the hot air blower. The output terminal of relay 7 is electrically connected to the hot air blower, ensuring that the control signal is accurately transmitted to the blower, enabling its start and stop control.
[0055] As a preferred embodiment, a relay 7 with high sensitivity and stability can be selected to ensure that it can accurately respond to the trigger signal of the spring device and reliably control the start and stop of the hot air blower. Meanwhile, to further improve the system's anti-interference capability, a filter circuit can be added to the control terminal of relay 7 to filter out electromagnetic interference or other noise signals, ensuring the purity and reliability of the control signal.
[0056] In some embodiments of this application, the control circuit is used to control the hot air blower to start and control the fan blade switch 8 corresponding to the spring device that sent the trigger signal to open when a trigger signal is received from any spring device; the control circuit is also used to control the hot air blower to stop working when none of the spring devices are triggered. However, in practical applications, the structural design of the spring device directly affects its triggering sensitivity and reliability. In this regard, this application optimizes the structure of the spring device. Specifically, each spring device includes a mounting base 52, a contact 53, a rotating shaft 54, and a spring 51. The rotating shaft 54 is rotatably mounted on the mounting base 52, and the spring 51 is fixed to the rotating shaft 54; when triggered by an object, the spring 51 rotates and contacts the contact 53 to generate a trigger signal.
[0057] The mounting base 52 is used to fix the entire spring device and provide a mounting position for the rotating shaft 54. The contact 53 is fixed on the mounting base 52 and serves as a connection point for the circuit; when the spring 51 is triggered, it contacts the spring 51 to form a circuit. The rotating shaft 54 is the central axis of rotation of the spring 51, and its rotation is set on the mounting base 52 to ensure that the spring 51 can rotate flexibly. The spring 51 is the component that directly contacts the object; when pushed by the object, it rotates around the rotating shaft 54, thereby triggering the contact 53. In a preferred embodiment, the spring 51 can be made of a metal sheet with a certain degree of elasticity so that it can reliably reset after being subjected to external force.
[0058] In some embodiments of this application, multiple spring-loaded devices are used to sense the passage of an object and control the opening of the fan blade switch 8. However, if the correspondence between the spring-loaded devices and the fan blade switch 8 is not defined, the control flexibility may be insufficient, and adjustments may not be possible according to actual needs. Therefore, this application proposes that each set of spring-loaded devices controls at least one fan blade switch 8. In this way, the range and intensity of the hot air blowing can be adjusted more flexibly to accommodate objects of different sizes and shapes.
[0059] The solution of this application achieves fine control over the hot air blowing onto the object by associating each set of spring devices with at least one fan blade switch 8, thereby better adapting to objects of different sizes and shapes.
[0060] In the embodiment of the high-efficiency heat shrink machine described above in this application, the rotating shaft 54 in the spring device may loosen after long-term use or when subjected to external impact, affecting the triggering accuracy and sensitivity of the spring 51. To address this, this application provides an improvement by providing a locking screw 55 on each rotating shaft 54 to lock and brake the rotating shaft 54, thereby improving the stability and reliability of the spring device.
[0061] In the embodiment of the high-efficiency heat shrink machine described above in this application, the meshing structure of the worm gear 63 and the worm 64 may be corroded by the external environment during long-term operation, such as dust and water vapor, which may lead to increased wear and lubrication failure, thereby affecting transmission efficiency and service life.
[0062] To address the aforementioned issues, this application provides an improvement by adding a worm gear housing 61, housing the worm gear 63 and worm 64 within the housing 61. This provides a relatively enclosed and clean working environment for the worm gear 63 and worm 64, reducing the impact of external factors on their performance.
[0063] The worm gear housing 61 refers to a housing structure used to protect the meshing mechanism of the worm gear 63 and worm 64. Its main function is to prevent external impurities from entering the meshing area and to maintain internal lubrication. The material of the worm gear housing 61 can be metal, plastic, or other materials with good sealing and wear resistance.
[0064] Specifically, the worm gear housing 61 can be a split structure for easy installation and maintenance, or an integrated structure to improve overall strength and sealing. The worm gear housing 61 can be equipped with a lubricating oil filler port and an oil drain port for convenient lubrication and maintenance of the worm gear 63 and worm 64.
[0065] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A high-efficiency heat shrink machine, characterized in that, include: Conveyor belt (1), used to define the path for transporting items; The hot air blower has its outlet end connected to the air inlet (3); Multiple sets of spring clip devices are arranged along the item conveying path. When each set of spring clip devices is triggered by an item on the item conveying path, it is used to generate a trigger signal. Multiple fan blade switches (8) are provided corresponding to the multiple sets of spring contact devices; The control circuit is electrically connected to the plurality of spring contacts, the hot air blower, and the plurality of fan blade switches (8); The control circuit is used to control the hot air blower to start when it receives the trigger signal sent by any of the spring devices, and to control the fan blade switch (8) corresponding to the spring device that sent the trigger signal to open. When any set of spring devices (4) is in the triggered state, the hot air blower (2) remains powered on continuously; When none of the spring devices (4) are triggered, the hot air blower (2) is controlled to stop running.
2. The high-efficiency heat shrink machine according to claim 1, characterized in that, The spring device includes a rotatable rotating shaft (54); a worm wheel (63) is fixedly connected to the rotating shaft (54), and the worm wheels (63) on the plurality of rotating shafts (54) are all engaged with a worm (64) in the axial direction, and the worm (64) is connected to a throttle (62).
3. The high-efficiency heat shrink machine according to claim 1, characterized in that, The multiple sets of spring devices are arranged in pairs along both sides of the article conveying path; the spring device includes a spring (51), which is inclined toward the center line of the article conveying path.
4. The high-efficiency heat shrink machine according to claim 1, characterized in that, The control circuit includes a relay (7); multiple spring devices are connected in parallel to the control terminal of the relay (7), and the output terminal of the relay (7) is electrically connected to the hot air blower.
5. A high-efficiency heat shrink machine according to claim 1, characterized in that, The spring device includes a mounting base (52) and a contact (53) fixed on the mounting base (52); the spring device also includes a rotating shaft (54) and a spring (51), the rotating shaft (54) is rotatably mounted on the mounting base (52), and the spring (51) is fixed to the rotating shaft (54); the spring (51) rotates and contacts the contact (53) when triggered by the item to generate the trigger signal.
6. A high-efficiency heat shrink machine according to claim 3, characterized in that, Each set of spring devices controls at least one of the fan blade switches (8).
7. A high-efficiency heat shrink machine according to claim 2, characterized in that, It also includes multiple locking screws (55), each of the rotating shafts (54) is provided with a corresponding locking screw (55) for locking and braking the rotating shaft (54).
8. A high-efficiency heat shrink machine according to claim 2, characterized in that, It also includes a worm gear housing (61), in which the worm gear (63) and the worm (64) are disposed.