A packaging apparatus for low temperature frozen food grade transparent bags

Abstract

The utility model discloses a kind of packaging devices of low-temperature frozen food grade transparent bag, including processing table and fixedly installed gantry at the top of processing table: the inside wall of the gantry is provided with conveying mechanism of conveying transparent bag, and the top of the gantry is provided with packaging mechanism;The packaging mechanism includes the fixed mouth of being opened in the top of gantry, and the inside wall in the fixed mouth is rotatably connected with the shaft, and the outside wall of the gantry is fixedly installed with motor, and the motor output shaft and the end of the shaft are fixedly connected.The utility model, by the collaborative design of conveying mechanism and exhaust air bag, realize transparent bag fixed-distance conveying and efficient exhaust: the gear tooth of conveying mechanism and spur gear engage, drive conveying belt intermittent operation, ensure transparent bag accurate positioning;Along the arc-shaped exhaust air bag of gradually high of conveying direction, gradually extrude from bag mouth to bag bottom, cooperate with the continuous contact of adjacent air bag, exhaust air in bag completely, avoid gas expansion when low-temperature frozen and lead to bag rupture.

Description

Technical Field

[0001] This utility model relates to the field of food packaging technology, and more specifically, it relates to a packaging device for a food-grade transparent bag that can be frozen at low temperatures. Background Technology

[0002] Low-temperature frozen food-grade transparent bags are specialized packaging products made of polymer materials such as polyethylene (PE), polypropylene (PP), or nylon (PA). They possess freeze resistance and anti-brittleness properties in low-temperature environments ranging from -40℃ to -18℃, and their transparency allows for easy visualization of the food inside. This type of packaging is widely used for frozen pastries, fresh seafood, meat products, and other foods that require long-term frozen storage.

[0003] Current food bag sealing equipment on the market requires venting the already filled bags using an venting device when processing cryogenically frozen transparent bags. Traditional sealing equipment often uses a single squeezing or suction method for venting, which cannot adapt to the complex shape of the food inside the transparent bag. Residual air inside the bag often causes gas expansion during cryogenic freezing, creating internal pressure due to differences in the cold shrinkage coefficients of the packaging bag materials. This can lead to bag bulging and deformation, stress concentration at the seal, or even rupture of the bag, resulting in food contamination. Furthermore, existing venting devices lack specific treatment for the sealing area of ​​the transparent bag, resulting in chaotic venting paths and the formation of air pockets near the bag opening. This can lead to impurities or incomplete sealing during subsequent sealing, failing to meet the stringent requirements for airtight packaging of cryogenically frozen foods. Therefore, we propose a sealing device for cryogenically frozen food-grade transparent bags to solve these problems. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a packaging device for a food-grade transparent bag that can be frozen at low temperature.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a packaging device for food-grade transparent bags that can be frozen at low temperatures, comprising a processing table and a gantry frame fixedly installed on top of the processing table:

[0007] A conveying mechanism for conveying transparent bags is provided on the inner side wall of the gantry frame, and a sealing mechanism is provided on the top of the gantry frame;

[0008] The packaging mechanism includes a fixed opening at the top of the gantry frame, a rotating shaft rotatably connected to the inner wall of the fixed opening, a motor fixedly installed on the outer wall of the gantry frame, the output shaft of the motor and the end of the rotating shaft being fixedly connected, multiple T-shaped limiting rods fixedly installed at the top inner wall of the gantry frame, a common lifting plate slidably connected to the outer wall of the multiple T-shaped limiting rods, an elliptical push plate fixedly sleeved on the outer wall of the rotating shaft and in contact with the top of the lifting plate, a return spring slidably sleeved on the outer wall of the T-shaped limiting rod and fixedly connected to the bottom of the lifting plate, a packaging machine top plate and multiple exhaust airbags fixedly installed at the bottom of the lifting plate, and a packaging machine bottom plate adapted to the packaging machine top plate fixedly installed on the inner wall of the gantry frame.

[0009] As a preferred technical solution of this utility model, the conveying mechanism includes multiple conveying rollers rotatably connected to the inner side wall of the gantry frame. The multiple conveying rollers are connected by the same conveyor belt. A spur gear is fixedly sleeved on the outer side wall of one of the conveying rollers, and a toothed gear that meshes with the spur gear is fixedly sleeved on the outer side wall of the rotating shaft.

[0010] In a preferred embodiment of this invention, the distance between two adjacent conveying rollers is the same.

[0011] As a preferred embodiment of this utility model, the bottom height of the plurality of exhaust airbags gradually increases along the material transfer direction of the conveying mechanism, and the bottom contour of the exhaust airbag is arc-shaped.

[0012] As a preferred technical solution of this utility model, the outer walls of two adjacent exhaust airbags are in contact with each other.

[0013] As a preferred technical solution of this utility model, the top of the lifting plate is provided with multiple sliding openings, and the outer side wall of the adjacent T-shaped limiting rod and the inner side wall of the sliding opening are slidably connected.

[0014] As a preferred embodiment of this utility model, the side of the lifting plate is slidably connected to the inner wall of the gantry frame, and the fixing port and the lifting plate are coaxially arranged.

[0015] The advantages of this utility model are:

[0016] 1. Through the coordinated design of the conveying mechanism and the exhaust airbag, the transparent bag is conveyed at a fixed distance and the exhaust is efficient: the toothed gear and the spur gear of the conveying mechanism mesh to drive the conveyor belt to run intermittently, ensuring the precise positioning of the transparent bag; the arc-shaped exhaust airbag that rises gradually along the conveying direction squeezes from the bag mouth to the bottom of the bag, and with the continuous contact of the adjacent airbags, the air inside the bag is completely discharged, avoiding the bag from breaking due to gas expansion when freezing at low temperature.

[0017] 2. The lifting plate is driven by an elliptical pusher and a return spring, which enables precise alignment and heat sealing between the top and bottom plates of the packaging machine: the rotation of the elliptical pusher pushes the lifting plate down, the T-shaped limit rod and the sliding guide ensure accurate packaging position, and the return spring ensures stable reset of the mechanism; this design not only realizes the automated linkage of packaging and conveying, improving production efficiency, but also effectively extends the shelf life of low-temperature frozen foods through reliable sealing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the packaging device for a low-temperature frozen food-grade transparent bag according to the present invention.

[0019] Figure 2 This is a side sectional view of the elliptical pusher plate in the packaging device for a low-temperature frozen food-grade transparent bag according to this utility model.

[0020] Figure 3 This is a schematic diagram of the bottom structure of the lifting plate in the packaging device for a low-temperature frozen food-grade transparent bag according to this utility model.

[0021] Figure 4 This is a side view of multiple exhaust air bladders in a packaging device for a low-temperature frozen food-grade transparent bag according to the present invention.

[0022] Figure 5 This is a side sectional view of the conveyor belt in the packaging device for a low-temperature frozen food-grade transparent bag according to this utility model.

[0023] Reference numerals: 1. Processing table; 2. Gantry frame; 3. Fixing port; 4. Rotating shaft; 5. Motor; 6. T-shaped limit rod; 7. Lifting plate; 8. Elliptical push plate; 9. Return spring; 10. Top plate of the packaging machine; 11. Exhaust airbag; 12. Bottom plate of the packaging machine; 13. Conveyor roller; 14. Conveyor belt; 15. Spur gear; 16. Gear with missing tooth. Detailed Implementation

[0024] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described in more detail below by way of example with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0025] Reference Figure 1-5A packaging device for low-temperature frozen food-grade transparent bags includes a processing table 1 and a gantry frame 2 fixedly installed on the top of the processing table 1. A conveying mechanism for conveying transparent bags is provided on the inner side wall of the gantry frame 2, and a packaging mechanism is provided on the top of the gantry frame 2. The packaging mechanism includes a fixing port 3 opened on the top of the gantry frame 2, a rotating shaft 4 rotatably connected to the inner side wall of the fixing port 3, a motor 5 fixedly installed on the outer side wall of the gantry frame 2, the output shaft of the motor 5 and the end of the rotating shaft 4 being fixedly connected, multiple T-shaped limiting rods 6 fixedly installed on the top inner side of the gantry frame 2, a same lifting plate 7 slidably connected to the outer side wall of the multiple T-shaped limiting rods 6, an elliptical push plate 8 fixedly sleeved on the outer side wall of the rotating shaft 4 and in contact with the top of the lifting plate 7, a return spring 9 slidably sleeved on the outer side wall of the T-shaped limiting rods 6 and fixedly connected to the bottom of the lifting plate 7, a packaging machine top plate 10 and multiple exhaust airbags 11 fixedly installed on the bottom of the lifting plate 7, and a packaging machine bottom plate 12 adapted to the packaging machine top plate 10 fixedly installed on the inner side wall of the gantry frame 2.

[0026] To further explain, the automatic conveying and sealing of transparent bags is achieved through the linkage design of the conveying mechanism and the sealing mechanism. The motor 5 drives the rotating shaft 4 to rotate the elliptical push plate 8, which pushes the lifting plate 7 to slide up and down along the T-shaped limit rod 6, so that the top plate 10 of the sealing machine and the bottom plate 12 of the sealing machine cooperate to complete the heat sealing or cold pressing sealing. The return spring 9 ensures that the lifting plate 7 is stably reset. When the lifting plate 7 presses down, the exhaust airbag 11 squeezes the transparent bag and discharges the air inside the bag, avoiding the bag from breaking due to gas expansion during low-temperature freezing, thus improving the sealing performance and food preservation effect.

[0027] like Figure 1 and Figure 5 As shown, the conveying mechanism includes multiple conveying rollers 13 rotatably connected to the inner wall of the gantry 2. The multiple conveying rollers 13 are connected by the same conveyor belt 14. A spur gear 15 is fixedly sleeved on the outer wall of one of the conveying rollers 13, and a toothed gear 16 that meshes with the spur gear 15 is fixedly sleeved on the outer wall of the rotating shaft 4.

[0028] To further explain, the conveyor roller 13 of the conveyor mechanism works with the conveyor belt 14 to convey transparent bags. The toothed gear 16 meshes with the spur gear 15, so that the rotating shaft 4 drives the packaging mechanism while intermittently driving the conveyor mechanism to achieve fixed-distance conveying of transparent bags, ensuring accurate packaging position, and synchronizing with the action of the packaging mechanism, thereby improving the automation level and packaging efficiency of the equipment.

[0029] like Figure 5 As shown, the distance between any two adjacent conveyor rollers 13 is the same.

[0030] To further explain, this design ensures that the conveyor belt 14 smoothly transports the transparent bags, preventing bag shifting or wrinkling, keeping the transparent bags flat during transport, providing a good foundation for subsequent packaging processes, and improving the consistency of packaging quality.

[0031] like Figure 1 and Figure 4 As shown, the bottom height of multiple exhaust airbags 11 gradually increases along the material transfer direction of the conveying mechanism, and the bottom outline of the exhaust airbags 11 is arc-shaped.

[0032] To further explain, the bottom of the exhaust airbag 11 gradually increases in height and is arc-shaped along the conveying direction. When pressed down, air can be gradually discharged from the bag opening to the bottom of the bag, avoiding airflow accumulation and residual air inside the bag. The arc contour fits the bag body, reducing wear on the bag body, while ensuring thorough exhaust and optimizing the anti-expansion effect in low-temperature freezing environments.

[0033] like Figure 3 and Figure 4 As shown, the outer walls of two adjacent exhaust airbags 11 are in contact with each other.

[0034] To further explain, this design creates a continuous venting area that covers the width of the transparent bag, ensuring that all air inside the bag is completely expelled, avoiding localized residual air from affecting the sealing effect, and enhancing the uniformity and sealing of venting.

[0035] like Figure 1 As shown, the top of the lifting plate 7 has multiple sliding openings, and the outer side wall of the adjacent T-shaped limiting rod 6 and the inner side wall of the sliding opening are slidably connected.

[0036] To further explain, this design provides a guide for the lifting plate 7, preventing it from shifting during the lifting process, ensuring accurate alignment between the top plate 10 and the bottom plate 12 of the packaging machine, and ensuring that the exhaust airbag 11 is pressed down evenly, thereby improving the stability of the packaging and exhaust actions.

[0037] like Figure 1 As shown, the side of the lifting plate 7 is slidably connected to the inner wall of the gantry frame 2, and the fixing port 3 and the lifting plate 7 are coaxially arranged.

[0038] To further explain, this design further limits the movement trajectory of the lifting plate 7, making the packaging mechanism move more precisely, avoiding packaging position deviation caused by the shaking of the lifting plate 7, and improving the reliability of equipment operation and packaging accuracy.

[0039] The working principle of the sealing device for a low-temperature frozen food-grade transparent bag provided by this utility model is as follows:

[0040] 1. Place the transparent bag and start the equipment: Place the transparent bag of low temperature frozen food grade to be packaged with the opening end facing the packaging mechanism, and place it flat on the conveyor belt 14 of the conveying mechanism. Ensure that the bag is in the middle of the conveyor belt 14 and without wrinkles. Turn on the power of the motor 5 and start the motor 5 installed on the outer wall of the gantry 2. The output shaft of the motor 5 drives the rotating shaft 4 to start rotating.

[0041] 2. Transparent bag fixed-distance conveying: The toothed gear 16 on the outer wall of the rotating shaft 4 rotates synchronously with the rotating shaft 4 and meshes with the spur gear 15 on the outer wall of one of the conveying rollers 13 in the conveying mechanism, driving the conveying roller 13 to rotate. Through the conveyor belt 14, multiple conveying rollers 13 are driven to operate synchronously, so that the transparent bag is conveyed forward along the material transfer direction of the conveying mechanism. The intermittent meshing characteristic of the toothed gear 16 realizes the fixed-distance conveying of the conveyor belt 14. When the transparent bag is conveyed to the area directly below the packaging mechanism, the conveyor belt 14 temporarily stops moving and waits for packaging.

[0042] 3. Exhaust airbags 11 squeeze to exhaust air: During the rotation of the rotating shaft 4, the fixedly sleeved elliptical push plate 8 rotates synchronously with the rotating shaft 4. When the long axis end of the elliptical push plate 8 contacts the top of the lifting plate 7, it pushes the lifting plate 7 to slide downward along the multiple T-shaped limit rods 6 at the top of the inner side of the gantry frame 2. The multiple exhaust airbags 11 at the bottom of the lifting plate 7 then descend. The bottom of the exhaust airbags 11 first contacts the top of the transparent bag. As the lifting plate 7 continues to descend, the exhaust airbags 11, whose height gradually increases along the conveying direction, squeeze from the bag opening to the bottom of the bag in sequence, expelling the air inside the bag through the bag opening. The arc-shaped bottom contour of the exhaust airbags 11 fits the bag body, ensuring that the exhaust process is smooth and there is no wear on the bag body.

[0043] 4. Sealing machine top plate 10 and sealing machine bottom plate 12 cooperate for sealing: While the exhaust airbag 11 squeezes the transparent bag, the sealing machine top plate 10 at the bottom of the lifting plate 7 descends with the lifting plate 7 to contact the sealing machine bottom plate 12 fixedly installed on the inner side wall of the gantry 2. The two cooperate to heat seal or cold press seal the opening of the transparent bag. The matching structure of the sealing machine top plate 10 and sealing machine bottom plate 12 ensures that the sealing position is flat and the seal is firm, thus completing the sealing operation of the transparent bag.

[0044] 5. Lifting plate 7 reset: When the elliptical push plate 8 rotates to contact the top of the lifting plate 7 at the short axis end, the lifting plate 7 slides upward under the elastic force of the reset spring 9 on the outer wall of the T-shaped limit rod 6, gradually disengaging from the bottom plate 12 of the packaging machine. The exhaust airbag 11 rises synchronously with the top plate 10 of the packaging machine and returns to the initial position. At this time, the toothed gear 16 and the spur gear 15 mesh again, the conveyor belt 14 starts, and sends out the packaged transparent bag. At the same time, it conveys the next transparent bag to be packaged to the bottom of the packaging mechanism and enters the next round of packaging process.

[0045] 6. End of work and equipment shutdown: After all the transparent bags to be sealed have been processed, turn off the power to motor 5, stop the equipment from running, clean the remaining debris or packaging bags on conveyor belt 14, check whether there are stains or damage on the surface of exhaust air bag 11 and top plate 10 of sealing machine, and do a good job of cleaning and maintenance of the equipment to prepare for the next use.

[0046] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A packaging device for low-temperature frozen food-grade transparent bags, comprising a processing table (1) and a gantry frame (2) fixedly installed on the top of the processing table (1), characterized in that: The inner wall of the gantry (2) is provided with a conveying mechanism for conveying transparent bags, and the top of the gantry (2) is provided with a sealing mechanism; The packaging mechanism includes a fixed opening (3) on the top of the gantry (2), a rotating shaft (4) is rotatably connected to the inner wall of the fixed opening (3), a motor (5) is fixedly installed on the outer wall of the gantry (2), the output shaft of the motor (5) is fixedly connected to the end of the rotating shaft (4), a plurality of T-shaped limit rods (6) are fixedly installed on the top of the inner wall of the gantry (2), a lifting plate (7) is slidably connected to the outer wall of the plurality of T-shaped limit rods (6), an elliptical push plate (8) is fixedly sleeved on the outer wall of the rotating shaft (4) and contacts the top of the lifting plate (7), a reset spring (9) is slidably sleeved on the outer wall of the T-shaped limit rod (6) and fixedly connected to the bottom of the lifting plate (7), a top plate (10) of the packaging machine and a plurality of exhaust airbags (11) are fixedly installed on the bottom of the lifting plate (7), and a bottom plate (12) of the packaging machine that is compatible with the top plate (10) of the packaging machine is fixedly installed on the inner wall of the gantry (2).

2. The packaging device for a low-temperature frozen food-grade transparent bag according to claim 1, characterized in that, The conveying mechanism includes multiple conveying rollers (13) rotatably connected to the inner wall of the gantry (2). The multiple conveying rollers (13) are connected by the same conveyor belt (14). A spur gear (15) is fixedly sleeved on the outer wall of one of the conveying rollers (13). A toothed gear (16) that meshes with the spur gear (15) is fixedly sleeved on the outer wall of the rotating shaft (4).

3. The packaging device for a low-temperature frozen food-grade transparent bag according to claim 2, characterized in that, The distance between any two adjacent conveyor rollers (13) is the same.

4. The packaging device for a low-temperature frozen food-grade transparent bag according to claim 1, characterized in that, Along the material transfer direction of the conveying mechanism, the bottom height of the plurality of exhaust airbags (11) gradually increases, and the bottom outline of the exhaust airbags (11) is arc-shaped.

5. The packaging device for a low-temperature frozen food-grade transparent bag according to claim 1, characterized in that, The outer walls of two adjacent exhaust airbags (11) are in contact with each other.

6. The packaging device for a low-temperature frozen food-grade transparent bag according to claim 1, characterized in that, The top of the lifting plate (7) has multiple sliding openings, and the outer side wall of the adjacent T-shaped limiting rod (6) and the inner side wall of the sliding opening are slidably connected.

7. The packaging device for a low-temperature frozen food-grade transparent bag according to claim 1, characterized in that, The side of the lifting plate (7) is slidably connected to the inner wall of the gantry frame (2), and the fixing port (3) and the lifting plate (7) are coaxially arranged.

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