Gas replacement device for modified atmosphere packaging machines

Abstract

This utility model provides a gas replacement device for a modified atmosphere packaging (MAP) machine, relating to the technical field of MAP machines. It includes a lifting device, a lower mold, a support plate, an upper mold, and a supporting device. The lower mold has a vertically oriented receiving groove; the support plate is disposed within the receiving groove; the lower mold is fixed to the top of a telescopic rod; the upper surface of the support plate is horizontal and flush with the upper surface of the lower mold; a negative pressure hole is provided on the support plate; the support plate is sealed against the inner wall of the receiving groove; a ventilation hole is provided on the inner wall of the receiving groove of the lower mold; the support plate can block the outlet of the ventilation hole; the upper mold is disposed above the lower mold; the supporting device includes a vertically movable pressing part; the upper mold is fixed to the bottom of the pressing part; the lower side of the upper mold is a horizontal pressing plane. The gas replacement device for a MAP machine provided by this utility model solves the problem of cumbersome steps in placing and removing packaging boxes in existing MAP machines, and can be easily integrated with conveyor belt automation.

Description

Technical Field

[0001] This utility model relates to the field of modified atmosphere packaging machine technology, specifically to a gas replacement device used in a modified atmosphere packaging machine. Background Technology

[0002] Modified atmosphere packaging (MAP) machines are specialized packaging equipment that uses a preservative mixture of nitrogen, oxygen, and carbon dioxide in a preset ratio to create a gaseous environment that inhibits microbial growth and slows down food oxidation and spoilage, thereby extending the shelf life of food. Gas replacement is the core and key step in modified atmosphere packaging, replacing the initial air in the packaging container with the preservative mixture.

[0003] In the prior art, such as the gas replacement device of the modified atmosphere packaging machine with Chinese patent application number 201510703372.5, the working principle of a typical gas replacement device has been disclosed. However, during gas replacement, the packaging box needs to be placed in the annular cylindrical cavity between the inner and outer cans, which is inconvenient. It is necessary to use, for example, a robotic arm to insert the packaging box into the annular cylindrical cavity from the vertical opening. When taking it out, it also needs to be taken out from the bottom of the annular cylindrical cavity upwards, which is not conducive to the automated packaging of the packaging box in conjunction with the conveyor belt. Utility Model Content

[0004] To address the aforementioned technical problems, the gas replacement device for modified atmosphere packaging machines provided by this utility model can be easily integrated with conveyor belt automation.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a gas replacement device for a modified atmosphere packaging machine, comprising a lifting device, a lower mold, a support plate, an upper mold, and a supporting device; the lower mold has a vertically oriented receiving groove; the support plate is disposed within the receiving groove; the lifting device includes a telescopic rod that can move vertically; the lower mold is fixed to the top of the telescopic rod; the lifting device can move the lower mold until the upper surface of the support plate is horizontal and flush with the upper surface of the lower mold; a negative pressure hole is provided at the bottom of the receiving groove; the support plate is sealed against the inner wall of the receiving groove; a ventilation hole is provided on the inner wall of the receiving groove of the lower mold; when the upper surface of the lower mold is flush with the upper surface of the support plate, the support plate can block the outlet of the ventilation hole; the upper mold is disposed above the lower mold; the supporting device includes a pressing part; the upper mold is fixed to the bottom of the pressing part; the lower side of the upper mold is a horizontal pressing plane.

[0006] The gas replacement device for a modified atmosphere packaging machine provided by this utility model preferably includes an upper mold comprising a fixed plate, a first spring assembly, a first pressure plate, a second spring assembly, and a second pressure plate; the first spring assembly is fixed to the bottom of the fixed plate; the first pressure plate is fixed to the bottom of the first spring assembly; the second spring assembly is fixed to the bottom of the fixed plate; the second pressure plate is fixed to the bottom of the second spring assembly; the first pressure plate has a sealing film through hole in the vertical direction; the second pressure plate can pass through the sealing film through hole for fixation; when not subjected to external force, the bottom horizontal plane of the second pressure plate is higher than the bottom horizontal plane of the first pressure plate; the top of the fixed plate has a movable hole; the lower pressing part is disposed through the movable hole; the bottom of the lower pressing part is fixed to the top of the second pressure plate.

[0007] The gas replacement device for a modified atmosphere packaging machine provided by this utility model preferably further includes a support platform; the lifting device is fixed on the support platform; a plurality of connecting rods are provided at the bottom of the lower mold; a plurality of connecting holes are provided on the support platform; the connecting rods are respectively disposed through the connecting holes; an auxiliary spring is sleeved on the outer wall of the connecting rod; the auxiliary spring extends vertically; the top of the auxiliary spring is fixed to the bottom of the lower mold; the bottom of the auxiliary spring is fixed to the upper surface of the support platform.

[0008] This utility model provides a gas replacement device for a modified atmosphere packaging machine, relating to the technical field of modified atmosphere packaging machines. It includes a lifting device, a lower mold, a support plate, an upper mold, and a supporting device. The lower mold has a vertically oriented receiving groove. The support plate is disposed within the receiving groove. The lifting device includes a telescopic rod that can move vertically. The lower mold is fixed to the top of the telescopic rod. The lifting device can move the lower mold until the upper surface of the support plate is horizontal and flush with the upper surface of the lower mold. A negative pressure hole is provided at the bottom of the receiving groove. The support plate is sealed against the inner wall of the receiving groove. A ventilation hole is provided on the inner wall of the receiving groove of the lower mold. When the upper surface of the lower mold is flush with the upper surface of the support plate, the support plate can block the outlet of the ventilation hole. The upper mold is disposed above the lower mold. The supporting device includes a pressing part. The upper mold is fixed to the bottom of the pressing part. The lower side of the upper mold is a horizontal pressing plane. The gas replacement device for modified atmosphere packaging machines provided by this utility model solves the problem of cumbersome steps in placing and removing packaging boxes in existing modified atmosphere packaging machines, and can be easily used in conjunction with conveyor belt automation. Attached Figure Description

[0009] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0010] Figure 1 This is a schematic diagram of the overall structure of the gas replacement device for a modified atmosphere packaging machine provided in Embodiment 1 of this utility model.

[0011] Figure 2 This is a cross-sectional structural schematic diagram of the gas replacement device for a modified atmosphere packaging machine provided in Embodiment 1 of this utility model. Detailed Implementation

[0012] Example 1: The gas replacement device for a modified atmosphere packaging machine provided in Embodiment 1 of this utility model, such as... Figures 1 to 2 As shown, the device includes a lifting device 1, a lower mold 2, a lifting plate 3, an upper mold 4, and a support device 5. The lower mold 2 has a vertically oriented receiving groove 21. The lifting plate 3 is disposed within the receiving groove 21. The lifting device 1 includes a telescopic rod 11 that can move vertically. The lower mold 2 is fixed to the top of the telescopic rod 11. The upper surface of the lower mold 2 is horizontal. The upper surface of the lifting plate is horizontal. The lifting device 1 can move the lower mold 2 until the upper surface of the lifting plate 3 is flush with the upper surface of the lower mold 2. A negative pressure hole 212 is provided at the bottom of the receiving groove 21. The lifting plate 3 is sealed against the inner wall of the receiving groove 21. A ventilation hole 211 is provided on the inner wall of the receiving groove 21. When the upper surface of the lower mold 2 is flush with the upper surface of the lifting plate 3, the lifting plate 3 can block the outlet of the ventilation hole 211. The upper mold 4 is disposed above the lower mold 2. The support device 5 includes a pressing part 51. The upper mold 4 is fixed to the bottom of the pressing part 51. The lower side of the upper mold 4 is a horizontal pressing plane.

[0013] In the gas replacement device for a modified atmosphere packaging machine provided in Embodiment 1 of this utility model, the conveyor belt is set on both sides of the lifting plate 3. After the conveyor belt moves the packaging box close to the lifting plate 3, a horizontal pushing device pushes the packaging box onto the lifting plate 3. Then, the lifting device 1 works, moving vertically upward through the telescopic rod 11 to lift the lower mold 2 upward. At this time, the bottom of the packaging box is still supported above the lifting plate 3, the upper surface of the lower mold 2 is higher than the packaging box, and the lower mold 2 is tightly pressed against the lower pressing plane of the upper mold 3 (at this time, it is tightly pressed). The sealing film is flush with the upper surface of the lower mold 2, and a gap is left between the sealing film and the opening of the packaging box (the air extraction and ventilation work can affect the gas inside the packaging box). When the telescopic rod 11 stops moving the lower mold 2 upward, the lower side of the upper mold 4 and the inner side wall of the receiving groove 21 form a sealed space. The air in this sealed space is extracted through the negative pressure hole 212 connected to an external vacuum pipe. Then, mixed gas is injected through the ventilation hole 211 on the side wall of the receiving groove, thereby achieving gas replacement in the sealed space where the packaging box is located, and then the subsequent sealing operation is performed. Compared with the prior art, this embodiment only requires the horizontal movement of the packaging box, instead of first moving the packaging box horizontally to the top of the cavity and then moving the packaging box vertically downward. Therefore, this embodiment simplifies the production process of automated packaging.

[0014] The gas replacement device for modified atmosphere packaging machines provided in Embodiment 1 of this utility model solves the problem of cumbersome steps in placing and removing packaging boxes in the prior art, and can be easily used in conjunction with conveyor belt automation.

[0015] To specifically implement the sealing operation, in this embodiment, the upper mold 4 includes a fixed plate 41, a first spring assembly 42, a first pressure plate 43, a second spring assembly 44, and a second pressure plate 45. The first spring assembly 42 is fixed to the bottom of the fixed plate 41; the first pressure plate 43 is fixed to the bottom of the first spring assembly 42; the second spring assembly 44 is fixed to the bottom of the fixed plate 41; the second pressure plate 45 is fixed to the bottom of the second spring assembly 44; the first pressure plate 43 has a sealing through hole 431 in the vertical direction; the second pressure plate 45 can pass through the sealing through hole 431 for fixation; when not subjected to external force, the bottom horizontal plane of the second pressure plate 45 is higher than the bottom horizontal plane of the first pressure plate 43; the top of the fixed plate 41 has a movable hole 411; the lower pressing part 51 is disposed through the movable hole 411; the bottom of the lower pressing part 51 is fixed to the top of the second pressure plate 45. The outer packaging film first moves to cover the lower side of the upper mold 4. When the lower mold 2 moves vertically upward, the upper surface of the lower mold 2 will first press against the lower surface of the first pressure plate 43, thereby sealing the opening of the receiving groove 21 of the lower mold 2 with the sealing film. At this time, the sealing film is higher than the opening of the packaging box on the support plate 3. After the air exchange is completed, the lower mold 2 continues to move upward. At this time, the first spring assembly 42 is compressed until the second pressure plate 45 contacts the sealing film. The lower side of the second pressure plate 45 is in contact with the upper surface of the lower mold 2. Then the edge of the second pressure plate 45 will cut the sealing film (in this embodiment, heat sealing film cutting is preferred, which is existing technology, such as the pull-out sealing mold for modified atmosphere packaging disclosed in Chinese patent application No. 202121262756.5, which will not be described in detail here). Then the lower mold 2 moves vertically downward, the first spring assembly 42 extends, and presses down the cut edge of the sealing film, thereby moving the edge of the sealing film below the packaging box. At this time, the middle of the sealing film has sealed the opening of the packaging box.

[0016] In this embodiment, a support platform 6 is also included; the lifting device 1 is fixed on the support platform 6; a plurality of connecting rods 22 are provided at the bottom of the lower mold 2; a plurality of connecting holes are provided on the support platform 6; the connecting rods 22 are respectively disposed through the connecting holes; an auxiliary spring 23 is sleeved on the outer wall of the connecting rod 22; the auxiliary spring 23 extends vertically; the top of the auxiliary spring 23 is fixed to the bottom of the lower mold 2; the bottom of the auxiliary spring 23 is fixed to the upper surface of the support platform 6. The connecting rods 22 are used to limit the vertical movement trajectory of the lower mold 2, and the auxiliary springs 23 can provide an auxiliary vertical upward elastic force when the lifting device 1 lifts the lower mold 2, thereby sharing the load of the lifting device 1 and extending the service life of the lifting device 1.

[0017] In summary, this utility model provides a gas replacement device for a modified atmosphere packaging machine, relating to the technical field of modified atmosphere packaging machines. It includes a lifting device, a lower mold, a support plate, an upper mold, and a supporting device. The lower mold has a vertically oriented receiving groove. The support plate is disposed within the receiving groove. The lifting device includes a telescopic rod that can move vertically. The lower mold is fixed to the top of the telescopic rod. The lifting device can move the lower mold until the upper surface of the support plate is horizontal and flush with the upper surface of the lower mold. A negative pressure hole is provided at the bottom of the receiving groove. The support plate is sealed against the inner wall of the receiving groove. A ventilation hole is provided on the inner wall of the receiving groove of the lower mold. When the upper surface of the lower mold is flush with the upper surface of the support plate, the support plate can block the outlet of the ventilation hole. The upper mold is disposed above the lower mold. The supporting device includes a vertically oriented pressing part. The upper mold is fixed to the bottom of the pressing part. The lower side of the upper mold is a horizontal pressing plane. The gas replacement device for modified atmosphere packaging machines provided by this utility model solves the problem of cumbersome steps in placing and removing packaging boxes in existing modified atmosphere packaging machines, and can be easily used in conjunction with conveyor belt automation.

[0018] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A gas replacement device for a modified atmosphere packaging machine, characterized in that, Includes lifting device, lower mold, lifting plate, upper mold and support device; The lower mold has a vertically oriented receiving groove; the lifting plate is disposed within the receiving groove. The lifting device includes a telescopic rod that can move vertically; the lower mold is fixed to the top of the telescopic rod. The upper surface of the lower mold is horizontal; the upper surface of the lifting plate is horizontal. The lifting device can move the lower mold until the upper surface of the lifting plate is flush with the upper surface of the lower mold; A negative pressure hole is provided at the bottom of the receiving groove; The lifting plate is sealed against the inner wall of the receiving groove; the inner wall of the receiving groove is provided with ventilation holes; When the upper surface of the lower mold is flush with the upper surface of the lifting plate, the lifting plate can block the air vent outlet. The upper mold is positioned above the lower mold; the support device includes a pressing part; The upper mold is fixed at the bottom of the lower pressing part; The lower side of the upper mold is a horizontal pressing plane.

2. The gas replacement device for a modified atmosphere packaging machine as described in claim 1, characterized in that, The upper mold includes a fixed plate, a first spring assembly, a first pressure plate, a second spring assembly, and a second pressure plate; The first spring assembly is fixed to the bottom of the fixed plate; The first pressure plate is fixed to the bottom of the first spring assembly; The second spring assembly is fixed to the bottom of the fixed plate; The second pressure plate is fixed to the bottom of the second spring assembly; The first pressure plate has a sealing film through hole in the vertical direction; the second pressure plate can be fixed by passing through the sealing film through hole; when not subjected to external force, the bottom horizontal plane of the second pressure plate is higher than the bottom horizontal plane of the first pressure plate. The top of the fixed plate has a movable hole; the pressing part passes through the movable hole; the bottom of the pressing part is fixed to the top of the second pressure plate.

3. The gas replacement device for a modified atmosphere packaging machine as described in claim 1, characterized in that, It also includes the support platform; The lifting device is fixed to the support platform; the bottom of the lower mold is provided with several connecting rods; several connecting holes are opened on the support platform; the connecting rods are respectively arranged through the connecting holes; An auxiliary spring is fitted on the outer wall of the connecting rod; the auxiliary spring extends vertically; the top of the auxiliary spring is fixed to the bottom of the lower mold; and the bottom of the auxiliary spring is fixed to the upper surface of the support platform.

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