Safety capper

Abstract

This utility model relates to the technical field of sealing machines, specifically a safety sealing machine, including a chassis, a frame fixed to the chassis, a drive assembly fixed to the frame, a sealing assembly fixed below the drive assembly, and a protective assembly located on the side of the sealing assembly. The protective assembly includes a positioning strip mounted on the chassis and a safety light curtain fixed to the positioning strip, the safety light curtain being located on the front side of the sealing assembly. The protective assembly also includes a support plate fixed to the front side of the sealing assembly, a pressure sensor fixed to the support plate, and a plastic plate slidably connected to the front side of the sealing assembly, the plastic plate being located directly below the pressure sensor. This solution employs a dual protection system using a safety light curtain and a pressure sensor. The safety light curtain detects danger using infrared light, while the pressure sensor is triggered by pressure, thereby improving the safety performance of the equipment, effectively enhancing equipment reliability, and reducing operational risks.

Description

Technical Field

[0001] This utility model relates to the technical field of sealing machines, specifically a safety sealing machine. Background Technology

[0002] Plastic bag sealing machines are widely used in industrial production and daily life. The working principle of a heat-sealing machine is as follows: a heating wire is fixed to the bottom of the pressure head, and a layer of heat-insulating cloth is wrapped around the heating wire. An electric current is passed through the heating wire to generate heat, and the pressure head then presses the plastic bag to seal the opening. The heat from the heating wire is transferred to the plastic bag through the heat-insulating cloth, causing the plastic bag to stick together and form a sealed opening.

[0003] In actual production, when workers use sealing machines to seal plastic bags, the speed of operation may cause fingers to slip under the pressure head. This can burn the worker's hands or cause mechanical injury due to excessive pressure. To address this, existing technology, "A Foot-Operated Sealing Machine" (publication number: CN204137405U), discloses a semi-automatic sealing machine. It uses an infrared sensor installed in front of the sealing area. When a worker's hand enters the sealing area, the light emitted by the infrared sensor is blocked, thus determining whether the worker's hand has left the sealing area and providing safety protection. However, this existing technology still has the following technical problems:

[0004] Because infrared sensors are easily affected by environmental factors such as ambient light and temperature, existing infrared sensors may misinterpret or experience decreased sensitivity under direct sunlight or high temperatures, failing to detect a person's hand approaching in a timely and accurate manner, thus reducing the effectiveness of safety protection. If dust or debris adheres to the infrared transmitter or receiver, or if it is obstructed by other objects, it may hinder the normal propagation and reception of infrared rays, causing the sensing function to fail and rendering it ineffective for protection. Utility Model Content

[0005] This utility model provides a safety sealing machine, which can solve the problem that the infrared sensor in the existing sealing machine fails to function due to interference from environmental factors, thus failing to provide effective safety protection.

[0006] This application provides the following technical solution: a safety sealing machine, including a chassis, a frame fixed on the chassis, a drive assembly fixed on the frame, a sealing assembly fixed below the drive assembly, and a protective assembly located on the side of the sealing assembly;

[0007] The protective assembly includes a positioning strip disposed opposite to the chassis and a safety light curtain fixed on the positioning strip, the safety light curtain being located on the front side of the sealing assembly;

[0008] The protective assembly also includes a support plate fixed to the front side of the sealing assembly, a pressure sensor fixed to the support plate, and a plastic plate slidably connected to the front side of the sealing assembly, the plastic plate being located directly below the pressure sensor.

[0009] Beneficial effects:

[0010] 1. Multiple protective components enhance safety effectiveness. This solution incorporates two protective components: a safety light curtain and a pressure sensor, forming a dual protection system. The safety light curtain can quickly detect when an operator's hand or other object blocks the infrared light. Simultaneously, because the plastic plate is located directly below the pressure sensor, the sealing assembly moves the plastic plate. If a person's hand enters the sealing area, the bottom of the plastic plate will first contact the hand, causing the top of the plastic plate to move upwards relative to the sealing assembly and contact the pressure sensor directly above. The pressure sensor senses the pressure of the plastic plate before the sealing assembly performs the sealing operation and triggers a signal. This adds an extra layer of protection on top of the safety light curtain, enhancing operator protection and improving the equipment's safety performance.

[0011] 2. Reduced safety risks and high reliability. Safety light curtains are non-contact protective devices that detect whether an object is obstructing the light path by emitting and receiving infrared light, thus determining if a dangerous situation has occurred. In contrast, pressure sensors are contact sensors, requiring direct contact and pressure from a person or object with the plastic plate to trigger. Therefore, if the safety light curtain fails to detect a hazard in time due to environmental factors, the pressure sensor can immediately sense the pressure change upon contact with the plastic plate in front of the sealing assembly, activating the protective mechanism. This effectively compensates for potential malfunctions in the light curtain's response, providing additional safety assurance for operators, reducing safety risks, and improving the overall safety and reliability of the equipment.

[0012] Furthermore, the sealing assembly includes a pressure head fixed to the drive assembly, a heat insulation cloth wrapped around the pressure area of ​​the pressure head, a heating strip located between the bottom of the pressure head and the heat insulation cloth, a pressure strip fixed to the side of the pressure head, and a sealing platform fixed to the chassis. The sealing platform is located directly below the pressure head, and the pressure strip is used to fix the heat insulation cloth to the pressure head.

[0013] Beneficial Effects: The pressure head and drive assembly are securely connected, ensuring precise and powerful pressure application. This allows for flexible and efficient operation of items on the sealing platform, which, located directly below, provides stable support and ensures accurate sealing. A heating strip cleverly positioned between the bottom of the pressure head and the insulation cloth efficiently generates heat, precisely targeting the sealing area of ​​the plastic bag for effective heat transfer. Simultaneously, the insulation cloth surrounds the pressure area, significantly reducing heat loss to other parts, improving energy efficiency and effectively preventing accidental burns to operators, thus enhancing safety. The pressure strip firmly secures the insulation cloth to the side of the pressure head, preventing displacement or detachment during frequent operation and ensuring continuous and stable insulation. This sealing component design is rational, with all components working closely together to comprehensively improve the performance and reliability of the sealing machine, from efficient sealing and energy saving to safety protection.

[0014] Furthermore, a support block is fixed to the side of the pressure head, and the support block is provided with a vertical sliding groove. Both ends of the plastic plate are provided with protrusions, which are slidably connected to the sliding grooves on the support block.

[0015] Beneficial effects: The support block is fixed to the side of the pressure head, and the vertical groove on it is connected to the sliding joint of the plastic plate at both ends. This provides precise movement guidance for the plastic plate, allowing the upper end of the plastic plate to accurately contact the pressure sensor's contact, accurately trigger the pressure, and improve the reliability of the protection system.

[0016] Furthermore, the plastic sheet is made of a transparent material.

[0017] Beneficial effects: During the operation of the sealing machine, the operator can clearly observe the specific situation under the sealing components through the transparent plastic plate, including whether the plastic bag to be sealed is placed in the correct position, whether the items inside the bag move abnormally during the sealing process, etc., so as to make timely adjustments, ensure the sealing quality and the integrity of the product packaging, and effectively reduce operational errors caused by the inability to observe.

[0018] Furthermore, the drive assembly includes a cylinder fixed on the frame, a push plate fixed to the lower end of the piston rod of the cylinder, a rod slidably connected to the push plate, a fixing plate fixed to the lower end of the rod, a connecting strip fixed below the fixing plate, and a sliding plate fixed below the connecting strip. A compression spring is sleeved on the rod portion between the push plate and the fixing plate, and the support plate and the pressure head are both fixed on the sliding plate.

[0019] Beneficial Effects: The cylinder, fixed to the frame, provides a stable and powerful power source for the entire drive process, ensuring the piston rod can accurately reciprocate up and down. The push plate is securely connected to the lower end of the piston rod, effectively transmitting power. The rods slide on the push plate, forming a stable and flexible transmission structure with the fixed plate, connecting strip, and slide plate. This structure precisely guides the lifting and lowering of the pressure head, ensuring the accuracy of the sealing operation. The compression spring fitted on the rod between the push plate and the fixed plate plays a crucial buffering role during operation. When the cylinder drives the pressure head downward, the spring reduces the impact force, preventing excessive compression and damage to items on the sealing platform. When the pressure head rises to its original position, the spring assists in a smooth return, reducing mechanical vibration and wear, and extending the equipment's service life.

[0020] Furthermore, the chassis is also provided with guide blocks, which are positioned opposite each other at both ends of the slide plate. The guide blocks are provided with vertical guide grooves, and the two ends of the slide plate can slide within the guide grooves.

[0021] Beneficial effects: The guide groove provides a precise guide path for the vertical movement of the slide plate, ensuring that it slides smoothly only in the vertical direction during operation, effectively avoiding deviations in the pressure head position caused by offset or wobbling. This greatly improves the precision of the sealing operation, ensuring that the pressure head accurately acts on the plastic bag on the sealing platform each time, thereby guaranteeing the consistency and stability of the sealing quality. Attached Figure Description

[0022] Figure 1 This is the main structural view of the present invention.

[0023] Figure 2 for Figure 1 A magnified view of area A in the middle.

[0024] Figure 3 for Figure 2 Top view.

[0025] Figure 4 for Figure 3 Top view after removing the support plate, pressure sensor, support block, and plastic plate. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] The markings in the accompanying drawings include: cylinder 1, frame 2, push plate 3, rod 4, compression spring 5, fixing plate 6, connecting strip 7, slide plate 8, safety light curtain 9, positioning strip 10, guide block 11, chassis 12, sealing platform 121, support plate 13, pressure sensor 14, pressure head 15, support block 16, pressure strip 17, heat insulation cloth 18, heating strip 19, plastic plate 20, and protrusion 201.

[0028] Example 1

[0029] like Figures 1 to 4 As shown, the safety sealing machine includes a housing 12, a frame 2 fixed on the housing 12, a drive assembly fixed on the frame 2, a sealing assembly fixed below the drive assembly, and a protective assembly located on the side of the sealing assembly.

[0030] like Figure 1 As shown, the drive assembly includes a cylinder 1 fixed to the frame 2, a push plate 3 fixed to the lower end of the piston rod of the cylinder 1, a rod 4 slidably connected to the push plate 3, a fixing plate 6 fixed to the lower end of the rod 4, a connecting strip 7 welded and fixed below the fixing plate 6, and a slide plate 8 fixed below the connecting strip 7 by screws. A compression spring 5 is sleeved on the rod portion of the rod 4 between the push plate 3 and the fixing plate 6. The housing 12 is also provided with guide blocks 11, which are arranged opposite to each other at both ends of the slide plate 8. The guide blocks 11 are provided with vertical guide grooves, and both ends of the slide plate 8 can slide within the guide grooves.

[0031] The sealing assembly includes a pressure head 15 fixed below the slide plate 8, a heat-insulating cloth 18 wrapped around the bottom pressure area of ​​the pressure head 15, a heating strip 19 located between the bottom of the pressure head 15 and the heat-insulating cloth 18, a pressure strip 17 fixed to the side of the pressure head 15 with screws, and a sealing platform 121 fixed to the housing 12. The pressure head 15 has a groove on its upper part, and the lower end of the slide plate 8 can be inserted into the groove for limitation. The side of the pressure head 15 is secured to the slide plate 8 with screws. The pressure strip 17 is used to press and fix the heat-insulating cloth 18 wrapped around the bottom of the pressure head 15 onto the pressure head 15. The sealing platform 121 is located directly below the pressure head 15. Wires can be connected to both ends of the heating strip 19, and the wires are connected to a power source. Powering the heating strip 19 causes it to heat up, facilitating the sealing of the plastic bag. The heating strip 19 is existing technology, and its specific structure will not be described in detail here.

[0032] like Figures 2 to 4As shown, the protective assembly includes a positioning strip 10 mounted on the chassis 12, a safety light curtain 9 fixed to the positioning strip 10, a support plate 13 fixed to the front side of the slide plate 8, a pressure sensor 14 fixed to the support plate 13, a support block 16 fixed to the front side of the pressure head 15, and a plastic plate 20 slidably connected to the support block 16. The support block 16 has a vertical groove, and the two ends of the plastic plate 20 have T-shaped protrusions 201. Similarly, the groove cross-section is also T-shaped to match the protrusions 201. The protrusions 201 are slidably connected to the groove on the support block 16. The plastic plate 20 is made of transparent material and is located directly below the pressure sensor 14. The distance between the lower end of the plastic plate 20 and the upper end of the sealing platform 121 is less than the distance between the lower end of the pressure head 15 and the upper end of the sealing platform 121. This technology also includes a controller, which is a PLC controller or a microcontroller. A solenoid valve is provided on the air supply passage of cylinder 1. The controller is electrically connected to the solenoid valve, pressure sensor 14, and safety light curtain 9.

[0033] The usage method of this solution is as follows:

[0034] like Figures 2 to 4 As shown, during normal operation, the operator holds the plastic bag with both hands, inserts the end of the plastic bag to be sealed into the gap between the sealing platform 121 and the pressure head 15, lays the plastic bag on the sealing platform 121, and starts the equipment. The starting device is preferably a foot switch. Then, the cylinder 1 drives the push plate 3 to press down. The pushing force of the push plate 3 is transmitted to the fixed plate 6, the connecting strip 7 and the slide plate 8 in sequence through the compression spring 5. The slide plate 8 drives the pressure head 15 to move down and press the upper end of the plastic bag. The heat generated by the heating strip 19 is transferred to the plastic bag through the heat insulation cloth 18, so that the plastic bag is heat-melted and sealed. During this process, when the bottom of the pressure head 15 presses against the sealing platform 121, there is still a gap between the bottom of the plastic plate 20 and the upper surface of the machine box 12. Therefore, during normal operation, the plastic plate 20 will not move relative to the pressure head 15, and the upper end of the plastic plate 20 will not touch the pressure sensor 14.

[0035] If a worker's hand enters the sealing area during the downward movement of the pressure head 15, the safety light curtain 9 can quickly detect it when the infrared light is blocked by the worker's hand. Upon receiving the signal from the safety light curtain 9, the PLC controller controls the cylinder 1 to stop driving, thus forming the first layer of safety protection. It is worth emphasizing that this technology can also provide secondary protection if the first layer of protection fails, offering even higher safety performance. Specifically, because the worker's hand is in the sealing area, the plastic plate 20 will preferentially touch the worker's hand before the pressure head 15 presses down on it. The hand's restriction causes the plastic plate 20 to slide upwards relative to the entire pressure head 15 and contact the pressure sensor 14. The pressure sensor 14 then triggers a signal before the pressure head 15 touches the hand. The PLC controller receives the signal and controls the cylinder 1 to stop driving, thus adding a contact-type safety barrier on top of the safety light curtain 9. The contact-type pressure sensor 14 can compensate for the failure of the non-contact infrared sensor, effectively enhancing the protection of the operator and improving the safety performance of the equipment.

[0036] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A safety capper characterised in that: It includes a chassis, a rack fixed to the chassis, a drive assembly fixed to the rack, a sealing assembly fixed below the drive assembly, and a protective assembly located on the side of the sealing assembly; The protective assembly includes a positioning strip disposed opposite to the chassis and a safety light curtain fixed on the positioning strip, the safety light curtain being located on the front side of the sealing assembly; The protective assembly also includes a support plate fixed to the front side of the sealing assembly, a pressure sensor fixed to the support plate, and a plastic plate slidably connected to the front side of the sealing assembly, the plastic plate being located directly below the pressure sensor. The sealing assembly includes a pressure head fixed to the drive assembly, a heat insulation cloth wrapped around the pressure area of ​​the pressure head, a heating strip located between the bottom of the pressure head and the heat insulation cloth, a pressure strip fixed to the side of the pressure head, and a sealing platform fixed to the chassis. The sealing platform is located directly below the pressure head, and the pressure strip is used to fix the heat insulation cloth to the pressure head. The distance between the lower end of the plastic sheet and the upper end of the sealing platform is less than the distance between the lower end of the pressure head and the upper end of the sealing platform.

2. The safety sealing machine according to claim 1, characterized in that: A support block is fixed to the side of the pressure head. The support block has a vertical groove. The two ends of the plastic plate have protrusions that slide in the grooves on the support block.

3. The safety capper according to claim 2, characterized in that: The plastic sheet is made of a transparent material.

4. The safety capper according to claim 3, wherein: The drive assembly includes a cylinder fixed to the frame, a push plate fixed to the lower end of the piston rod of the cylinder, a rod slidably connected to the push plate, a fixing plate fixed to the lower end of the rod, a connecting strip fixed below the fixing plate, and a sliding plate fixed below the connecting strip. A compression spring is sleeved on the rod of the rod between the push plate and the fixing plate. The support plate and the pressure head are both fixed on the sliding plate.

5. The safety capper according to claim 4, characterized in that: The chassis is also equipped with guide blocks, which are positioned opposite each other at both ends of the slide plate. The guide blocks are provided with vertical guide grooves, and the two ends of the slide plate can slide within the guide grooves.

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