A pre-cooked rice vacuum packaging apparatus and method

Abstract

The present application relates to the technical field of pre-prepared grain processing, in particular to a pre-prepared grain rice vacuum packaging device and method, comprising a supporting seat, a rubber strip, a sealing mechanism and a driving unit. In the present application, firstly, the heat sealing strip two and the heat sealing strip three form a heat sealing area around the mouth of the packaging box, which not only serves as a supporting seat during the pressing and heat sealing of the film and the packaging box, but also improves the close degree between the mold seat and the edge of the packaging box before the heat sealing operation, thereby improving the sealing effect of the packaging, and avoiding the deformation of the packaging box caused by the pressure of the mold pressing on the packaging box, which affects the close degree between the edge of the box mouth and the heat sealing film. Secondly, the heat sealing operation process of the heat sealing strip one forms upper end heat sealing and lower end heat sealing around the edge of the box mouth twice, which not only guarantees the required heat sealing area, but also reduces the required material for the edge of the box mouth, thereby reducing the cost of the packaging box, and improving the sealing and packaging effect of the packaging box through two heat sealing operations.

Description

Technical Field

[0001] This invention relates to the field of pre-processed grain technology, specifically to a vacuum packaging device and method for pre-processed grain rice. Background Technology

[0002] Vacuum packaging of pre-cooked grain rice is an advanced food processing and preservation technology. By removing the air from the packaging box to create a low-oxygen environment, and then sealing the packaging box, the shelf life of pre-cooked grain rice products is greatly extended.

[0003] Currently, when packaging pre-cooked grain rice, the packaging box containing the grain rice is first transported to the bottom of the existing packaging machine via an external conveyor. The packaging machine closes up and down, pressing the packaging box tightly inside while simultaneously extracting oxygen from the box. Then, a heat-sealing film is pressed onto the top of the packaging box opening, and the heat-sealing film is heat-sealed to the top surface of the packaging box opening using an electrically heated heat-sealing method. After cooling, the heat-sealed packaging box and the heat-sealing film are cut and separated. The packaged packaging box remains in the conveyor and is transported and moved by the conveyor. The above process is repeated to carry out a streamlined vacuum packaging operation.

[0004] The existing technical process has the following problems: When the heat-sealing film is pressed tightly onto the packaging box by the upper and lower closing of the sealing machine, the pressure is transmitted to the entire packaging box. However, since the packaging box is usually made of flexible plastic, it is difficult to ensure that the fit between the upper part of the packaging box and the heat-sealing film meets the heat-sealing requirements. Poor fit between the packaging box and the heat-sealing film may affect the sealing effect after heat sealing.

[0005] Secondly, in order to ensure that there is sufficient area for heat sealing at the edge of the packaging box, the edge area of ​​the packaging box needs to be extended to meet the heat sealing requirements, which requires more materials to be used during the production of the packaging box and increases costs. Summary of the Invention

[0006] Therefore, it is necessary to provide a pre-prepared grain rice vacuum packaging equipment and method to solve the problems of the prior art.

[0007] This application provides a pre-made grain rice vacuum packaging equipment, which is used in conjunction with a conveying device, including: a support base, on which a mold base is provided that slides up and down, and a plurality of material boxes arranged at equal intervals for placing packaging boxes are provided on the conveyor belt, and a rubber strip is fixedly provided on the lower end face of the mold base.

[0008] A sealing mechanism is provided between the support base and the mold base. The sealing mechanism includes a heat sealing strip. The lower end face of the mold base is provided with a heat sealing strip and a heat sealing assembly corresponding to the conveyor belt. The heat sealing assembly includes two heat sealing strips distributed left and right and two heat sealing strips distributed front and back. The heat sealing strip one contacts the upper side of the box opening, the heat sealing strip two contacts the left and right sides of the box opening, and the heat sealing strip three contacts the front and back sides of the box opening.

[0009] The transverse cross-section of heat-sealing strip two and the longitudinal cross-section of heat-sealing strip three are both L-shaped.

[0010] The sealing mechanism also includes a driving unit, which enables heat sealing strips two and three to be tightly attached to the opening of the packaging box.

[0011] The packaging box is transported to the bottom of the mold base by the conveying equipment. Heat sealing strip one is attached to the top surface of the packaging box, and heat sealing strip two and heat sealing strip three are attached to the perimeter of the packaging box opening to form a heat sealing area around the packaging box opening. This allows for packaging operations that heat seal the top of the packaging box and L-shaped heat seal the perimeter.

[0012] According to an advantageous embodiment, the drive unit includes a connecting frame, and two connecting frames distributed to the left and right are fixedly disposed on the lower end face of the mold base. A first abutment frame is slidably disposed on the connecting frame, and a second heat sealing strip is fixedly disposed on the side end face of the first abutment frame facing the center of the mold base.

[0013] The support base is fixedly provided with multiple support frames arranged at equal intervals from front to back. The support frames and the conveyor belt are staggered. Each end face of the support frame facing the adjacent conveyor belt is provided with a second abutment frame through a telescopic rod. A third heat sealing strip is fixedly provided on the end face of the second abutment frame facing the center of the mold base.

[0014] Lifting frames are slidably installed on both the left and right sides of the support frame, and the lifting frames are hinged to the corresponding clamping frames by hinge strips.

[0015] According to an advantageous embodiment, the left and right sides of the horizontal section of the heat-sealing strip three are provided with fitting grooves. When both the heat-sealing strip two and the heat-sealing strip three are attached to the corresponding packaging box, the inner wall of the fitting groove is attached to the L-shaped area of ​​the corresponding heat-sealing strip three.

[0016] According to an advantageous embodiment, two adjacent heat-sealing strips 2 and 3, when brought together, together form a heat-sealing area surrounding the edge of the box opening and used for sealing.

[0017] Both ends of the heat-sealing strip three are chamfered.

[0018] According to an advantageous embodiment, the rubber strip surrounds the heat-sealing strip, and multiple auxiliary pressure strips are slidably disposed on the lower end face of the mold base via an elastic telescopic rod.

[0019] The auxiliary pressure strips are located on both sides of the middle area between the rubber strip and the heat sealing strip. The lower side of the auxiliary pressure strips is an arc-shaped surface facing the packaging box. The auxiliary pressure strips are in sync with the edge of the packaging box opening as the mold base moves down.

[0020] According to an advantageous embodiment, the first clamping frame is provided with a waist-shaped locking groove corresponding to the conveyor belt, and the second clamping frame is also provided with two locking grooves distributed on the left and right.

[0021] The mold base has multiple receiving cavities corresponding to the conveyor belt. A hydraulic cylinder corresponding to the locking groove is fixedly installed in the receiving cavity. A locking post is rotatably installed on the telescopic section of the hydraulic cylinder. A waist-shaped locking block is fixedly installed on the lower end face of the locking post.

[0022] The lower end face of the locking block is chamfered.

[0023] According to an advantageous embodiment, a drive post corresponding to the locking post is rotatably arranged inside the receiving cavity. Gears are sleeved on both the drive post and the locking post. The corresponding two gears mesh with each other. The locking post slides up and down through the corresponding gear, and the gear on the locking post is rotatably arranged on the inner wall of the lower end of the receiving cavity. The drive post is fixedly inserted through the corresponding gear.

[0024] According to an advantageous embodiment, a notch area is provided on the left rear side of the first heat-sealing strip, and the second and third heat-sealing strips adjacent to the notch area both adapt to change the heat-sealing area according to the area of ​​the notch area.

[0025] In addition, the present invention also provides a vacuum packaging method for pre-prepared grain rice, including the following steps: S1, conveying the packaging box: the packaging box containing the pre-prepared grain rice is placed manually into the material box, and the packaging box is conveyed sequentially to the bottom of the mold base by means of a conveying device.

[0026] S2, Locking the Packaging Box: When the packaging box to be packaged moves directly under the mold base, the area to be heat-sealed on the heat-sealing film also moves between the packaging box and the mold base. Then the mold base moves down and the driving unit causes heat-sealing strips two and three to adhere to the packaging box. Heat-sealing strips one, two, and three cooperate to adhere to and lock the packaging box, forming an annular heat-sealing area. At the same time, the rubber strip seals the annular heat-sealing area.

[0027] S3. Air Expulsion: The air in the area formed between the rubber strip and heat sealing strips two and three is extracted, thus expelling the air from the packaging box.

[0028] S4. Heat sealing operation: Heat sealing strip one, heat sealing strip two and heat sealing strip three are all heat sealing operations, and multiple points are heat sealed on the top surface of the box opening, the four sides of the box opening and the bottom surface of the box opening to complete a single heat sealing operation.

[0029] S5, Box-film separation: The conveying equipment continues to operate, causing the packaging box that has undergone heat sealing to move to the left, and the heat sealing film also moves to the left and is cut on the left side of the mold base, thus completing the vacuum packaging operation of a single packaging box.

[0030] In summary, the present invention has the following beneficial effects: Firstly, the heat-sealing area surrounding the opening of the packaging box is formed by heat-sealing strips two and three. This not only serves as a supporting base during the pressing of the heat-sealing film and the packaging box, but also improves the tightness between the mold base and the edge of the packaging box before the heat-sealing operation, thereby improving the packaging sealing effect. At the same time, it avoids the deformation of the packaging box caused by the pressure of the mold acting on the packaging box, which would affect the adhesion between the edge of the box opening and the heat-sealing film. Secondly, in conjunction with the heat-sealing operation of heat-sealing strip one, two heat-sealing operations are formed around the edge of the box opening: upper heat sealing and lower heat sealing. This reduces the material required for the edge of the box opening while ensuring the required heat-sealing area, thus reducing the cost of the packaging box. At the same time, the two heat-sealing operations improve the sealing effect of the packaging box. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 A three-dimensional structural schematic diagram of a pre-prepared grain rice vacuum packaging device according to an embodiment of the present invention is shown.

[0033] Figure 2 A front view of a pre-prepared grain rice vacuum packaging device according to an embodiment of the present invention is shown.

[0034] Figure 3 A partial sectional side view of the mold base, support frame, and connecting frame provided according to an embodiment of the present invention is shown.

[0035] Figure 4 A three-dimensional structural diagram of the support, heat-sealing strip one, and clamping frame two provided according to an embodiment of the present invention is shown.

[0036] Figure 5 The present invention provides an embodiment of the invention. Figure 4 Enlarged view of point A in the middle.

[0037] Figure 6 The present invention provides an embodiment of the invention. Figure 4 Enlarged view of point B in the middle.

[0038] Figure 7A partial cross-sectional perspective view of the mold base, support frame, clamping frame one and clamping frame two provided according to an embodiment of the present invention is shown.

[0039] Figure 8 A three-dimensional structural diagram of the heat-sealing strip 2, heat-sealing strip 3, and gear provided according to an embodiment of the present invention is shown.

[0040] Figure 9 The present invention provides an embodiment of the invention. Figure 8 Enlarged view of point C in the middle.

[0041] Figure 10 A partial exploded perspective view of the area between heat-sealing strip two and heat-sealing strip three provided according to an embodiment of the present invention is shown.

[0042] Figure 11 A perspective view of the packaging box after heat-sealing strips two and three provided according to an embodiment of the present invention are attached.

[0043] The above-mentioned figures include the following reference numerals: 1. Support seat; 2. Mold base; 3. Material box; 4. Rubber strip; 5. Sealing mechanism; 50. Heat sealing strip one; 51. Heat sealing assembly; 510. Heat sealing strip two; 511. Heat sealing strip three; 512. Fitting groove; 52. Drive unit; 520. Connecting frame; 521. Pressing frame one; 522. Support frame; 523. Pressing frame two; 524. Lifting frame; 525. Hinge strip; 53. Auxiliary pressure strip; 54. Locking groove; 540. Receiving cavity; 541. Locking post; 542. Locking block; 543. Drive post; 544. Gear; 55. Notch area; 6. Heat sealing film. Detailed Implementation

[0044] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] like Figure 1 and Figure 2 As shown, a pre-made grain rice vacuum packaging equipment, used in conjunction with a conveying device and a cutting device, includes: a support seat 1, which is closely attached to the lower end face of the upper conveyor belt in the conveying device; a mold seat 2 that slides up and down is provided on the support seat 1; the mold seat 2 is driven to move up and down by an external hydraulic cylinder (not shown in the figure); multiple material boxes 3 arranged at equal intervals for placing packaging boxes are provided on the conveyor belt; and an unwinding assembly (not shown in the figure) for unwinding and rewinding heat-sealing film 6 is provided above the conveying device.

[0046] like Figure 1 and Figure 5 As shown, an annular rubber strip 4 is fixedly provided on the lower end face of the mold base 2. It should be noted that the rubber strip 4 is made of high-temperature resistant food-grade rubber, such as silicone rubber and TPU.

[0047] like Figure 1 , Figure 2 , Figure 4 and Figure 11 As shown, a sealing mechanism 5 is provided between the support base 1 and the mold base 2. The sealing mechanism 5 includes a ring-shaped heat sealing strip 50. The lower end face of the mold base 2 is provided with a heat sealing strip 50 and a heat sealing assembly 51 corresponding to the conveyor belt. The heat sealing assembly 51 includes two heat sealing strips 510 distributed left and right and two heat sealing strips 511 distributed front and back. The heat sealing strip 50 contacts the upper side of the box opening, the heat sealing strip 510 contacts the left and right sides of the box opening, and the heat sealing strip 511 contacts the front and back sides of the box opening.

[0048] like Figure 10 and Figure 11 As shown, the transverse cross-section of the second heat-sealing strip 510 and the longitudinal cross-section of the third heat-sealing strip 511 are both L-shaped.

[0049] like Figure 1 As shown, the sealing mechanism 5 also includes a driving unit 52, which enables heat sealing strip 2 510 and heat sealing strip 3 511 to be tightly attached to the opening of the packaging box. In the same heat sealing assembly 51, heat sealing strip 2 510 and heat sealing strip 3 511 together form a heat sealing area surrounding the opening of the packaging box.

[0050] The base is equipped with an air pump (not shown in the figure) for vacuuming. The areas of heat sealing strip 1 50, heat sealing strip 2 510 and heat sealing strip 3 511 that contact the packaging box are all heat sealed after power is applied.

[0051] The packaging box is transported to the bottom of the mold base 2 by the conveying equipment, and the top surface of the packaging box is adhered by the heat sealing strip 50, and the heat sealing strips 510 and 511 are closely attached to the perimeter of the box opening, forming a ring-shaped heat sealing area, thereby performing the packaging operation of heat sealing the top of the packaging box and L-shaped heat sealing around the perimeter.

[0052] During operation, the heat-sealing film 6 for sealing is gradually released by the winding assembly, so that the heat-sealing film 6 directly below the mold base 2 is in an unused state during heat sealing packaging. Meanwhile, the conveyor belt in the conveying equipment moves the material box 3 synchronously, and the material box 3 moves the manually placed packaging box inside it gradually to directly below the mold base 2. When the packaging box moves directly below the mold base 2, the external hydraulic cylinder 1 operates, causing the mold base 2 to move downwards. Through the operation of the drive unit 52, the heat-sealing strips 510 and 511 approach and adhere to the opening of the packaging box. Finally, the mold base 2 moves the rubber strip 4 on it to tightly adhere to the upper ends of the heat-sealing strips 510 and 511. At the same time, the heat-sealing strip 50 presses the heat-sealing film 6 down to the upper end of the packaging box. Thus, a suction space is formed by the rubber strip 4, heat-sealing strip 510, and heat-sealing strip 511. (For the cooperation state of heat-sealing strips 510 and 511, please refer to...) Figure 10 and Figure 11 The air in the suction space is extracted by an air pump, and then heat sealing strips 50, 510, and 511 are heat sealed. This results in multi-point heat sealing of the upper, sides, and lower surfaces of the box opening, improving the sealing degree of the box after heat sealing. Furthermore, the above-mentioned heat sealing method around the box opening ensures the sealing effect with less material used and reduces the cost of the box opening. After the heat sealing is completed, the box is cut on the left side of the mold base 2 using an external cutting device (not shown in the figure), so that the heat-sealed box is separated from the overall heat sealing film 6. This completes the vacuum packaging operation of a single box.

[0053] like Figure 1 , Figure 4 and Figure 7 As shown, the drive unit 52 includes a connecting frame 520. Two connecting frames 520 are fixedly arranged on the lower end face of the mold base 2, and a first abutting frame 521 is slidably arranged on the connecting frame 520. A second heat sealing strip 510 is fixedly arranged on the side end face of the first abutting frame 521 facing the center of the mold base 2.

[0054] like Figure 3 and Figure 4 As shown, a plurality of support frames 522 are fixedly arranged at equal intervals from front to back on the support base 1. The support frames 522 and the conveyor belt are staggered. Each end face of the support frame 522 facing the adjacent conveyor belt is provided with a second abutment frame 523 through a telescopic rod. A third heat sealing strip 511 is fixedly installed on the end face of the second abutment frame 523 facing the center of the mold base 2.

[0055] like Figure 4 and Figure 7As shown, the connecting frame 520 is equipped with an external hydraulic cylinder (not shown in the figure) for pushing the first abutment frame 521 to move left and right. Lifting frames 524 are slidably arranged on both the left and right sides of the support frame 522. The lifting frames 524 are driven by an external hydraulic cylinder (not shown in the figure) to move up and down. The lifting frames 524 and the corresponding abutment frame 523 are hinged together by a hinge strip 525.

[0056] like Figure 10 and Figure 11 As shown, the left and right sides of the horizontal section of the heat-sealing strip 511 are provided with fitting grooves 512. When the heat-sealing strip 510 and the heat-sealing strip 511 are both attached to the corresponding packaging box, the inner wall of the fitting groove 512 is attached to the L-shaped area of ​​the corresponding heat-sealing strip 511.

[0057] When two adjacent heat-sealing strips 510 and two heat-sealing strips 511 are joined together, they form a heat-sealing area for bonding and sealing.

[0058] To facilitate the insertion of heat sealing strip 3 511 into the two adjacent heat sealing strips 2 510, both ends of heat sealing strip 3 511 are chamfered.

[0059] During operation, the conveyor belt stops moving when it carries the packaging box and material box 3 containing the heat-sealing material to directly below the mold base 2. (It should be noted that the material box 3 is adapted to the shape of the packaging box. Furthermore, the position where the material box 3 moves directly below the mold base 2 is the result of multiple tests and adjustments by personnel in the relevant field. This is all existing technology. That is, the material box 3 and the packaging box move directly below the mold base 2 during the packaging process.) The external hydraulic cylinder 1 first works to move the mold base 2 downward. The mold base 2 then moves the rubber strip 4 and the heat-sealing strip 50 on it downward simultaneously. It should be noted that the thickness of the rubber strip 4 when it is not deformed is greater than the thickness of the heat-sealing strip 50. The rubber strip 4 first contacts the heat-sealing film 6 and lightly presses the heat-sealing film 6 to the top of the packaging box.

[0060] Then, the second external hydraulic cylinder operates, causing the first clamping frame 521 to move the second heat sealing strip 510 on it closer to the packaging box. Subsequently, the third external hydraulic cylinder operates, causing the lifting frame 524 to move upward. The lifting frame 524 moves synchronously with the corresponding second clamping frame 523 through the hinge strip 525. The second clamping frame 523 moves the third heat sealing strip on it to move synchronously closer to the corresponding packaging box. Then, during the movement of the third heat sealing strip 511, the inner wall of the mating groove 512 on the third heat sealing strip 511 gradually contacts and adheres to the two adjacent second heat sealing strips 510. At this point, the two second heat sealing strips 510 and the two third heat sealing strips 511 in the same heat sealing assembly 51 together form an annular heat sealing area, which is located directly below the rubber strip 4.

[0061] Subsequently, the external hydraulic cylinder operates again, causing the mold base 2 to drive the heat-sealing strips on it to apply downward pressure to the packaging box. At this time, the horizontal sections of heat-sealing strips 510 and 511 together support the opening of the packaging box, thus the rubber strip 4 presses tightly against the heat-sealing film 6 and the packaging box. Finally, heat-sealing strip 50 presses the heat-sealing film 6 tightly onto the packaging box. During the above process, the rubber strip 4 deforms, sealing the gap between the mold and the annular heat-sealing area. At this point, a sealed area is formed between the top of the packaging box and the mold. Then, the air pump operates to extract the air from the top of the packaging box before sealing and packaging. It should be further noted that in the above process, the horizontal sections of heat-sealing strips 510 and 511 serve as a support base when the mold presses down, preventing the mold's downward pressure from deforming the packaging box and affecting the heat-sealing and sealing effect.

[0062] Heat-sealing strips 50, 510, and 511 are all energized and heated to heat-seal the contact area between the packaging box and the heat-sealing film 6. This heat-sealing operation at two points not only improves the sealing effect of the packaging box, but also ensures the required area for heat sealing at the box opening while reducing the amount of material needed for the edge. It's worth noting that in existing technologies, the heat-sealing film 6 is typically heat-sealed entirely to the top surface of the box opening. To ensure a proper heat seal, the edge of the box opening needs to extend beyond the required area for heat sealing.

[0063] like Figure 4 and Figure 5 As shown, the rubber strip 4 surrounds the heat-sealing strip 50, and multiple auxiliary pressure strips 53 are slidably arranged on the lower end face of the mold base 2 via an elastic telescopic rod.

[0064] The auxiliary pressure strips 53 are located on both sides of the middle area between the rubber strip 4 and the heat sealing strip 50. The lower side of the auxiliary pressure strips 53 is an arc-shaped surface facing the packaging box. As the mold base 2 moves down, the auxiliary pressure strips 53 fit the edge of the packaging box opening and assist in pressing down the heat sealing mold, so that the heat sealing strip 511 can move back and forth to press the heat sealing film 6.

[0065] During operation, as the mold base 2 moves downward, the auxiliary pressure strip 53 on it moves downward synchronously. The auxiliary pressure strip 53 first contacts the heat-sealing film 6. As the mold base 2 moves downward, the spring rod is compressed and deformed. The elastic force generated by the deformation of the spring rod causes the auxiliary pressure strip 53 to press the area where the heat-sealing film 6 contacts the upper edge of the packaging box onto the packaging box. This action causes both the front and rear sides of the heat-sealing film 6 to tilt downward, making it easier for the heat-sealing strip 511 to approach the packaging box and press the heat-sealing film 6. This avoids the problem that the heat-sealing strip 511 will directly contact the heat-sealing film 6 after moving, which would prevent the heat-sealing operation from being performed.

[0066] like Figure 8 and Figure 9 As shown, the first clamping frame 521 has a waist-shaped locking groove 54 corresponding to the conveyor belt, and the second clamping frame 523 also has two locking grooves 54 distributed on the left and right.

[0067] like Figure 7 , Figure 8 and Figure 9 As shown, the mold base 2 has multiple receiving cavities 540 corresponding to the conveyor belt. A hydraulic cylinder corresponding to the locking groove 54 is fixedly installed in the receiving cavity 540. The extension section of the hydraulic cylinder is rotatably provided with a locking post 541. A waist-shaped locking block 542 is fixedly installed on the lower end face of the locking post 541.

[0068] To facilitate the locking block 542 to be inserted into the corresponding locking slot 54 from top to bottom, the lower end face of the locking block 542 is chamfered.

[0069] like Figure 7 , Figure 8 and Figure 9 As shown, a drive post 543 corresponding to the locking post 541 is rotatably disposed inside the receiving cavity 540. The drive post 543 is connected to an external motor (not shown in the figure). Gears 544 are sleeved on both the drive post 543 and the locking post 541. The two corresponding gears 544 mesh with each other. The locking post 541 slides up and down through the corresponding gear 544, and the gear 544 on the locking post 541 is rotatably disposed on the lower inner wall of the receiving cavity 540. The drive post 543 is fixedly disposed through the corresponding gear 544.

[0070] During operation, after the mold base 2 is attached to and presses down on the packaging box (at this time, vacuuming and heat sealing are not performed), the hydraulic cylinder operates, causing its telescopic end to drive the corresponding locking pin 541 and locking block 542 to move down synchronously. The locking pin 541 drives the locking block 542 through the corresponding locking groove 54. Then, the external motor operates, driving the drive pin 543 to rotate. Through the meshing between the gear 544 on the drive pin 543 and the corresponding gear 544, the locking pin 541 drives the locking block 542 to rotate synchronously. At this point, the locking block 542 and the locking groove are locked. The external hydraulic cylinder operates at 54, causing its telescopic end to retract. This applies upward pressure to the first clamping frame 521 and the second clamping frame 523 via the locking pin 541 and locking block 542. Combined with the downward movement of the mold base 2, this improves the tightness between the mold base 2 and the packaging box, indirectly increasing the vacuum level maintained by the deformation of the rubber strip 4. At the same time, it locks the first clamping frame 521, the second heat sealing strip 510, the second clamping frame 523, and the third heat sealing strip 511, improving the overall stability during the vacuuming and heat sealing processes.

[0071] After the packaging operation is completed, the external motor works to reverse and reset the drive column 543, and the hydraulic cylinder works to move the locking column 541 upward and reset.

[0072] like Figure 4 and Figure 6 As shown, a notch area 55 is provided on the left rear side of the heat sealing strip 50. The heat sealing strips 510 and 511, which are adjacent to the notch area 55, adapt to the change of the heat sealing area according to the area of ​​the notch area 55.

[0073] By utilizing the notch area 55 and the suitable areas on heat sealing strips 510 and 511, an unsealed area is left on the left rear side of the packaging box after the heat sealing operation. This facilitates the subsequent sealing and tearing process of the packaging box after heat sealing, and avoids the packaging box being unable to be opened conveniently because the heat-sealed area covers the entire opening of the packaging box.

[0074] It should be further explained that in the prior art, the rice in the packaging box is packaged by directly covering the upper surface of the packaging box opening with the heat-sealing film 6 and performing a heat-sealing operation on the upper surface. However, this solution adds heat-sealing strips 510 and 511. Therefore, heat-sealing strips 510 and 511 in the same heat-sealing component 51 together form a heat-sealing area for affixing and heat-sealing the sides of the packaging box edge. Thus, the heat-sealing area and the heat-sealing strip 50 together form a double heat seal on the upper surface of the packaging box, improving the sealing effect of the rice in the packaging box. Furthermore, the above method can distribute the sealing area covering the upper surface of the packaging box opening, which is the same as in the prior art, to the packaging box. The lower side and all sides of the box edge reduce the material used at the box opening edge, thus reducing costs. Furthermore, the added locking block 542 and locking post 541, using the horizontal sections of heat-sealing strips 510 and 511 as a base, cooperate with the mold base 2 to press the heat-sealing film 6 and the box opening edge, ensuring effective heat sealing. All the added components are existing conventional components, which can be used multiple times after a single installation. Moreover, compared to the economic benefits of improved sealing and reduced material usage, the economic benefits of adding these components are negligible. In summary, this technical solution is a specific improvement based entirely on and to address the deficiencies of existing technology.

[0075] In addition, the present invention also provides a vacuum packaging method for pre-prepared grain rice, including the following steps: S1, conveying the packaging box: the packaging box containing the pre-prepared grain rice is placed manually into the material box 3, and the packaging box is conveyed sequentially to the bottom of the mold base 2 by means of a conveying device.

[0076] S2, Locking the Packaging Box: When the packaging box to be packaged moves directly below the mold base 2, the area to be heat-sealed on the heat-sealing film 6 also moves between the packaging box and the mold base 2. Then, the mold base 2 moves down and the drive unit 52 causes the heat-sealing strip 2 510 and the heat-sealing strip 3 511 to adhere to the packaging box. At the same time, when the mold base 2 has finished moving down, the heat-sealing strip 1 50, the heat-sealing strip 2 510 and the heat-sealing strip 3 511 cooperate to adhere to and lock the packaging box, forming an annular heat-sealing area. Meanwhile, the rubber strip 4 seals the annular heat-sealing area.

[0077] S3. Air Expulsion: The air in the area formed between the rubber strip 4 and the heat sealing strip 2 510 and heat sealing strip 3 511 is extracted by the air pump, thus expelling the air from the packaging box.

[0078] S4. Heat sealing operation: Heat sealing strip 1 50, heat sealing strip 2 510 and heat sealing strip 3 511 are all heat sealed. At this point, the upper surface of the box opening, the four sides of the box opening and the lower surface of the box opening are heat sealed at multiple points, so that the heat sealing film 6 area on the top of the box is heat sealed and adhered to the edge of the box opening, thus completing a single heat sealing operation.

[0079] S5, Box-film separation: The conveying equipment continues to operate, causing the heat-sealed packaging box to move to the left, and the heat-sealing film 6 also moves to the left. A cutting operation is then performed on the left side of the mold base 2, so that the heat-sealed packaging box is separated from the overall heat-sealing film 6, thus completing the vacuum packaging operation of a single packaging box.

[0080] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0081] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0082] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0083] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pre-made grain rice vacuum packaging device, used in conjunction with a conveying device, characterized in that, include: The support base is provided with a mold base that slides up and down, and the conveyor belt is provided with multiple material boxes that are equally spaced and used to place packaging boxes. A rubber strip is fixedly provided on the lower end face of the mold base. A sealing mechanism is provided between the support base and the mold base. The sealing mechanism includes a heat sealing strip one. The lower end face of the mold base is provided with a heat sealing strip one and a heat sealing assembly corresponding to the conveyor belt. The heat sealing assembly includes two heat sealing strips two distributed on the left and right and two heat sealing strips three distributed in front and back. The heat sealing strip one contacts the upper side of the box opening, the heat sealing strip two contacts the left and right sides of the box opening, and the heat sealing strip three contacts the front and back sides of the box opening. The transverse cross section of the second heat-sealing strip and the longitudinal cross section of the third heat-sealing strip are both L-shaped; The sealing mechanism also includes a driving unit, which enables both heat sealing strip two and heat sealing strip three to be tightly attached to the opening of the packaging box. The packaging box is transported to the bottom of the mold base by the conveying equipment, and the top surface of the packaging box is attached by heat sealing strip one, and heat sealing strip two and heat sealing strip three are attached to the perimeter of the packaging box opening to form a heat sealing area around the packaging box opening, thereby carrying out the packaging operation of heat sealing the top of the packaging box and L-shaped heat sealing around the perimeter. The drive unit includes a connecting frame. Two connecting frames are fixedly installed on the lower end face of the mold base, distributed left and right. A first abutment frame is slidably installed on the connecting frame, and a second heat-sealing strip is fixedly installed on the side end face of the first abutment frame facing the center of the mold base. Multiple support frames are fixedly installed on the support base, arranged equidistantly from front to back. The support frames and the conveyor belt are staggered. A second abutment frame is slidably installed on the end face of the support frame facing the adjacent conveyor belt through a telescopic rod. A third heat-sealing strip is fixedly installed on the end face of the second abutment frame facing the center of the mold base. Lifting frames are slidably installed on both the left and right sides of the support frame. The lifting frames are hinged to the corresponding second abutment frame through a hinge strip. The rubber strip surrounds the heat-sealing strip one, and multiple auxiliary pressure strips are slidably arranged on the lower end face of the mold base through an elastic telescopic rod; the auxiliary pressure strips are all located on the front and rear sides of the middle area between the rubber strip and the heat-sealing strip one, and the lower side of the auxiliary pressure strips are all arc-shaped surfaces facing the packaging box. The auxiliary pressure strips fit the edge of the packaging box opening synchronously as the mold base moves down.

2. The pre-made grain rice vacuum packaging equipment according to claim 1, characterized in that: The three horizontal sections of the heat-sealing strip are provided with fitting grooves on both the left and right sides. When the two heat-sealing strips and the three heat-sealing strips are both attached to the corresponding packaging boxes, the inner wall of the fitting groove is attached to the L-shaped area of ​​the corresponding heat-sealing strip.

3. The pre-made grain rice vacuum packaging equipment according to claim 1, characterized in that: When two adjacent heat-sealing strips 2 and two heat-sealing strips 3 are joined together, they together form a heat-sealing area that surrounds the edge of the box opening and is used for sealing. Both ends of the heat-sealing strip three are chamfered.

4. The pre-made grain rice vacuum packaging equipment according to claim 1, characterized in that: The first clamping frame is provided with a waist-shaped locking groove corresponding to the conveyor belt, and the second clamping frame is also provided with two locking grooves distributed on the left and right. The mold base is provided with multiple receiving cavities corresponding to the conveyor belt. A hydraulic cylinder corresponding to the locking groove is fixedly installed in the receiving cavity. A locking pin is rotatably installed on the telescopic section of the hydraulic cylinder. A waist-shaped locking block is fixedly installed on the lower end face of the locking pin. The lower end face of the locking block is chamfered.

5. The pre-made grain rice vacuum packaging equipment according to claim 4, characterized in that: The cavity is rotatably equipped with a drive post corresponding to the locking post. Both the drive post and the locking post are fitted with gears. The two corresponding gears mesh with each other. The locking post slides up and down through the corresponding gear, and the gear on the locking post is rotatably mounted on the inner wall of the lower end of the cavity. The drive post is fixedly inserted through the corresponding gear.

6. The pre-made grain rice vacuum packaging equipment according to claim 1, characterized in that: A notch area is provided on the left rear side of the first heat-sealing strip. The second and third heat-sealing strips adjacent to the notch area adapt to the change of the heat-sealing area according to the area of ​​the notch area.

7. A method for vacuum packaging pre-cooked grain rice, comprising the use of a pre-cooked grain rice vacuum packaging device as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Conveying Packaging Boxes: Manually place the packaging boxes containing pre-cooked rice into the material box, and use a conveying device to transport the packaging boxes to the bottom of the mold base in sequence; S2, Locking the Packaging Box: When the packaging box to be packaged moves to the bottom of the mold base, the area to be heat-sealed on the heat-sealing film also moves between the packaging box and the mold base. Then the mold base moves down and the driving unit causes heat-sealing strips two and three to adhere to the packaging box. Heat-sealing strips one, two, and three cooperate to adhere to and lock the packaging box, forming an annular heat-sealing area. At the same time, the rubber strip seals the annular heat-sealing area. S3. Air removal: The air in the area formed between the rubber strip and heat sealing strips two and three is extracted, thus removing the air from the packaging box; S4. Heat sealing operation: Heat sealing strip one, heat sealing strip two and heat sealing strip three are all heat sealing operations, and multiple heat sealing operations are performed on the upper surface of the box opening, the four sides of the box opening and the lower surface of the box opening to complete a single heat sealing operation. S5, Box-film separation: The conveying equipment continues to operate, causing the packaging box that has undergone heat sealing to move to the left, and the heat sealing film also moves to the left and is cut on the left side of the mold base, thus completing the vacuum packaging operation of a single packaging box.

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