Nitrogen filling mechanism and nitrogen fresh-keeping packaging machine provided with same

Abstract

The invention discloses a nitrogen filling mechanism and a nitrogen fresh-keeping packaging machine provided with the same, and belongs to the technical field of packaging machines, the nitrogen filling mechanism comprises a rotary bag clamping part for clamping and conveying packaging bags, and a bag opening part capable of opening bag openings of the packaging bags is installed beside the rotary bag clamping part; a nitrogen filling bag opening part for filling nitrogen into the bag opening of the packaging bag is mounted above the bag opening part; the nitrogen filling bag opening part comprises a nitrogen filling pipe communicated with a nitrogen tank, the nitrogen filling pipe controls nitrogen conveying through an air cylinder, and the nitrogen tank is filled with high-pressure nitrogen. According to the nitrogen filling mechanism and the nitrogen freshness-locking packaging machine provided with the nitrogen filling mechanism, high-pressure nitrogen is filled into a bag opening of a packaging bag to blow the packaging bag, when the packaging bag is sealed in a vacuum mode subsequently, residual gas in the bag is nitrogen, and due to the fact that the nitrogen is more stable than air, the freshness of food in the bag can be effectively locked, and therefore the shelf life of the food is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging machines, and particularly to a nitrogen filling mechanism and a nitrogen fresh-keeping packaging machine equipped with the mechanism. Background Art

[0002] At present, most packaging machines on the market use air to open the bags of packaging bags. After the bags are opened, food is filled into them, and then the bags are vacuumized. The above method of using air to open the bags of packaging bags has certain problems, that is: although most of the air can be pumped out of the bag during vacuumization, there will still be air residue problems, which will make the fresh-keeping time of the food in the bag short and the ideal fresh-keeping effect cannot be achieved; secondly, at present, the content of nitrogen in the nitrogen tank is mainly monitored by a pressure sensor. This pressure sensor is an electronic component, which is not only easy to break but also costly. The detection components such as this pressure sensor are not good in terms of service life and cost. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a nitrogen filling mechanism and a nitrogen fresh-keeping packaging machine equipped with the mechanism that can fill nitrogen into the packaging bag when opening the bag, so as to make the fresh-keeping effect of the food better.

[0004] The technical solution of the present invention is realized as follows:

[0005] A nitrogen filling mechanism includes a rotary bag clamping part for clamping and conveying the packaging bag. A bag opening part capable of opening the bag mouth of the packaging bag is installed beside the rotary bag clamping part. A nitrogen filling and bag opening part for filling nitrogen into the bag mouth of the packaging bag is installed above the bag opening part;

[0006] The nitrogen filling and bag opening part includes a nitrogen filling pipe communicating with the nitrogen tank. The nitrogen filling pipe controls the nitrogen delivery through a cylinder, and high-pressure nitrogen is filled in the nitrogen tank; a nitrogen filling head assembly is detachably installed at the end of the nitrogen filling pipe. The nitrogen filling head assembly includes a main nitrogen filling head, and two auxiliary nitrogen filling heads perpendicular to each other and downward are connected to both sides of the bottom end of the main nitrogen filling head.

[0007] Adopting the above solution, the nitrogen filling mechanism blows the packaging bag by filling high-pressure nitrogen into the bag mouth of the packaging bag. When the packaging bag is subsequently vacuum sealed, the gas remaining in the bag is nitrogen. Since nitrogen is more stable than air, it can effectively lock the freshness of the food in the bag, thereby extending the shelf life of the food.

[0008] As a preferred implementation manner of the nitrogen filling mechanism, the nitrogen filling pipe is fixed in a clamp seat, and both the clamp seat and the cylinder are fixed on a vertically arranged column.

[0009] Adopting the above solution, in order to improve the stability during nitrogen filling, the nitrogen filling pipe is fixed in the clamp seat, and then the clamp seat is fixed on the column. At this time, the nitrogen filling pipe is located above the packaging bag, and nitrogen is filled from top to bottom.

[0010] As a preferred embodiment of a nitrogen filling mechanism, a valve core located between two auxiliary nitrogen filling heads is further assembled inside the main nitrogen filling head. Openings communicating with the chambers of the auxiliary nitrogen filling heads are provided on both sides of the valve core; at the bottom ends of the two valve cores, there is a indicating rod that can extend outside the main nitrogen filling head, and a spring for pushing the valve core upward is sleeved on the indicating rod.

[0011] With the above solution, in order to clearly indicate whether the nitrogen filling head assembly is in the inflation state, a traditional mechanical structure is adopted to indicate the inflation state; when high-pressure nitrogen is not filled into the main nitrogen filling head, at this time the valve core is not connected to the auxiliary nitrogen filling head and the indicating rod is completely hidden inside the main nitrogen filling head; when high-pressure nitrogen is filled into the main nitrogen filling head, at this time the valve core is connected to the auxiliary nitrogen filling head through the opening and the indicating rod extends outside the main nitrogen filling head; when the above mechanical structure is applied, it has a longer service life and lower cost.

[0012] As a preferred embodiment of a nitrogen filling mechanism, the rod body of the indicating rod is sprayed with paint that is different in color from that of the main nitrogen filling head and the auxiliary nitrogen filling head.

[0013] With the above solution, in order to facilitate the visual inspection part of the packaging machine to clearly identify the indicating rod, it is sprayed with paint of different colors, so as to facilitate the camera to identify.

[0014] As a preferred embodiment of a nitrogen filling mechanism, the rotary bag clamping part includes a rotary platform, and multiple groups of clamping arm components are fixedly installed on the side of the rotary platform. Each group of clamping arm components includes two relatively arranged clamping arms, and a clamping block is rotatably installed at the end of each clamping arm.

[0015] With the above solution, in order to clamp the packaging bag, the left and right sides of the bag mouth of the packaging bag are respectively clamped on the clamping blocks of each group of clamping arm components, and the bag opening and nitrogen filling of the packaging bag are completed one by one in a rotating manner.

[0016] As a preferred embodiment of a nitrogen filling mechanism, the bag opening part includes an outer bag opening component and an inner bag opening component;

[0017] The outer bag opening component includes two relatively arranged outer bag opening arms. One ends of the two outer bag opening arms are movably connected by an outer bag connecting arm, and an outer bag suction head is connected to the end of each outer bag opening arm far from the outer bag connecting arm through a suction pipe;

[0018] The inner bag opening component includes two relatively arranged inner bag opening arms. One side of the two inner bag opening arms is simultaneously movably connected by an inner bag side pulling arm, and an inner bag opening piece is fixed to the end of each inner bag opening arm far from the inner bag side pulling arm;

[0019] The outer-bag opening member further includes a protective shell one that covers the outer-bag opening arm; the inner-bag opening member further includes a protective shell two that covers both the inner-bag opening arm and the inner-side pulling arm of the bag.

[0020] With the above solution, in order to open the bag mouth of the packaging bag, two outer-bag suction heads respectively suck the outer sides of the bag mouth of the packaging bag, and two inner-bag opening pieces are located inside the bag mouth of the packaging bag. One inner-side pulling arm of the bag actively drives the two inner-bag opening arms to expand outwards. At this time, the two outer-bag opening arms follow the inner-bag opening arms and expand outwards passively, thereby gradually opening the bag mouth of the packaging bag; in order to protect the outer-bag opening member and the inner-bag opening member, all movable parts are hidden inside the protective shell, thus improving the safety during the operation of the equipment.

[0021] A nitrogen fresh-keeping packaging machine equipped with a nitrogen filling mechanism includes a machine base. The upper surface of the machine base is equipped with the above-mentioned nitrogen filling mechanism. The upper surface of the machine base is also equipped with a bag feeding part and a feeding part that are arranged clockwise or counterclockwise around the nitrogen filling mechanism in sequence. The upper surface of the machine base is also equipped with a vacuum pumping part arranged side by side with the nitrogen filling mechanism and a bag conveying part beside the vacuum pumping part. The upper surface of the machine base is also equipped with multiple visual inspection parts around the nitrogen filling mechanism and the vacuum pumping part respectively and a general control part. The lower surface of the machine base is equipped with a rotary driving part that drives the rotary bag clamping part to rotate.

[0022] With the above solution, when the packaging machine is working, the bag feeding part pushes the packaging bag to the rotary bag clamping part through the bag pushing part for clamping. The rotary bag clamping part rotates the packaging bag to the bag opening part to open the bag mouth of the packaging bag. Then, the nitrogen filling and bag opening part fills high-pressure nitrogen into the packaging bag. The rotary bag clamping part rotates the packaging bag to the feeding part to fill food into the packaging bag. The rotary bag clamping part rotates the packaging bag to the vacuum pumping part, and through the bag pushing part, the packaging bag is sent into the vacuum chamber of the vacuum pumping part to extract the excess nitrogen and then seal it. Finally, the packaging bag falls to the bag conveying part and is conveyed out.

[0023] As a preferred implementation manner of a nitrogen fresh-keeping packaging machine equipped with a nitrogen filling mechanism, one of the visual inspection parts is installed beside the bag opening part. The camera of this visual inspection part faces the outer-bag suction head and the inner-bag opening piece. The camera of this visual inspection part can also clearly capture the paint color on the body of the indicating rod, so as to judge whether the indicating rod extends downwards.

[0024] With the above solution, in order to identify whether the opening of the packaging bag is normal, the visual inspection part is used to monitor it in real time. In addition, the visual inspection part is used to monitor whether the indicating rod extends at the same time. When the indicating rod can extend outside the main nitrogen filling head, it indicates that there is nitrogen passing through the main nitrogen filling head, and further indicates that the high-pressure nitrogen in the nitrogen tank is sufficient. When the indicating rod cannot extend outside the main nitrogen filling head, it indicates that there is no nitrogen passing through the main nitrogen filling head, and further indicates that the high-pressure nitrogen in the nitrogen tank is insufficient. The visual inspection part will feedback to the total control part to stop the equipment operation. At this time, nitrogen needs to be replenished into the nitrogen tank in time. In this way, the multi-function of one machine is realized, and at the same time, the monitoring of the nitrogen content in the nitrogen tank is solved. Since the indicating rod part is a mechanical part, its service life is longer and the cost is lower.

[0025] After adopting the above technical solution, the beneficial effects of the present invention are:

[0026] 1. The nitrogen filling mechanism blows the packaging bag by filling high-pressure nitrogen into the opening of the packaging bag. When the packaging bag is vacuum sealed later, the remaining gas in the bag is nitrogen. Since nitrogen is more stable than air, it can effectively lock the freshness of the food in the bag, thereby extending the shelf life of the food.

[0027] 2. In order to improve the stability during nitrogen filling, the nitrogen filling pipe is fixed in the clamping seat, and then the clamping seat is fixed on the column. At this time, the nitrogen filling pipe is located above the packaging bag, and nitrogen is filled from top to bottom.

[0028] 3. In order to clearly indicate whether the nitrogen filling head assembly is in the inflation state, it uses a traditional mechanical structure to indicate the inflation state. When no high-pressure nitrogen is filled into the main nitrogen filling head, the valve core is not connected to the auxiliary nitrogen filling head at this time and the indicating rod is completely hidden in the main nitrogen filling head. When high-pressure nitrogen is filled into the main nitrogen filling head, the valve core is connected to the auxiliary nitrogen filling head through the opening at this time and the indicating rod extends outside the main nitrogen filling head. When the above mechanical structure is applied, its service life is longer and the cost is lower.

[0029] 4. In order to facilitate the visual inspection part of the packaging machine to clearly identify the indicating rod, it is sprayed with paint of different colors, so as to facilitate the camera to identify.

[0030] 5. In order to clamp the packaging bag, the left and right sides of the opening of the packaging bag are respectively clamped on the clamping blocks of each group of clamping arm components, and the opening and nitrogen filling of the packaging bag are completed one by one in a rotating manner.

[0031] 6. To open the mouth of the packaging bag, two outer bag suction heads respectively suck the outer sides of the mouth of the packaging bag, and two inner bag opening pieces are located inside the mouth of the packaging bag. A bag inner pull arm actively drives two bag inner opening arms to expand outward, and at this time, two outer bag opening arms passively expand outward following the inner bag opening arms, thereby gradually opening the mouth of the packaging bag; to protect the outer mouth opening component and the inner mouth opening component, all movable parts are hidden inside the protective shell, thereby enhancing the safety during the operation of the equipment;

[0032] 7. When the packaging machine is working, the bag feeding part pushes the packaging bag to the rotary bag clamping part through the bag pushing part for clamping. The rotary bag clamping part rotates the packaging bag to the bag opening part to open the mouth of the packaging bag. Subsequently, the nitrogen filling and bag opening part fills high-pressure nitrogen into the packaging bag. The rotary bag clamping part rotates the packaging bag to the feeding part to fill food into the packaging bag. The rotary bag clamping part rotates the packaging bag to the vacuum pumping part, and through the bag pushing part, the packaging bag is sent to the vacuum chamber of the vacuum pumping part to extract the excess nitrogen and then seal it. Finally, the packaging bag falls to the bag conveying part and is conveyed out;

[0033] 8. To identify whether the mouth of the packaging bag is normal when it is opened, a visual inspection part is used to monitor it in real time. In addition, the visual inspection part is used to monitor whether the indicating rod extends at the same time; when the indicating rod can extend outside the main nitrogen filling head, it indicates that there is nitrogen passing through the main nitrogen filling head, and further indicates that the high-pressure nitrogen in the nitrogen tank is sufficient; when the indicating rod cannot extend outside the main nitrogen filling head, it indicates that there is no nitrogen passing through the main nitrogen filling head, and further indicates that the high-pressure nitrogen in the nitrogen tank is insufficient. The visual inspection part will feedback to the total control part to stop the operation of the equipment. At this time, nitrogen needs to be replenished into the nitrogen tank in time; thus, the machine realizes multiple functions, and at the same time solves the monitoring of the nitrogen content in the nitrogen tank. Since the indicating rod part is a mechanical part, its service life is longer and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 It is a three-dimensional structure diagram of the nitrogen filling mechanism;

[0036] Figure 2 It is a top view of the nitrogen filling mechanism;

[0037] Figure 3 It is for Figure 1 The three-dimensional structure diagram of the nitrogen filling and bag opening part when not inflated in

[0038] Figure 4 To show Figure 3 The three-dimensional structure diagram of the internal structure of the nitrogen filling head assembly in

[0039] Figure 5 For Figure 1 The three-dimensional structure diagram of the nitrogen filling and bag opening part in when inflated;

[0040] Figure 6 To show Figure 5 The three-dimensional structure diagram of the internal structure of the nitrogen filling head assembly in

[0041] Figure 7 For Figure 1 The three-dimensional structure diagram of the rotary bag clamping part in

[0042] Figure 8 For Figure 1 The three-dimensional structure diagram of the bag opening part in

[0043] Figure 9 The three-dimensional structure diagram after hiding the first protective shell and the second protective shell in the bag opening part;

[0044] Figure 10 The three-dimensional structure of the nitrogen lock fresh packaging machine equipped with a nitrogen filling mechanism Figure One ;

[0045] Figure 11 The three-dimensional structure of the nitrogen lock fresh packaging machine equipped with a nitrogen filling mechanism Figure Two ;

[0046] Figure 12 The top view of the nitrogen lock fresh packaging machine equipped with a nitrogen filling mechanism;

[0047] Figure 13 For Figure 10 The three-dimensional structure diagram of the inside of the frame in

[0048] Markings in the figure: 1 - Rotary bag clamping part; 101 - Rotary platform; 102 - Clamping arm; 103 - Clamping block; 2 - Bag opening part; 201 - Outer bag spreading arm; 202 - Outer bag connecting arm; 203 - Outer bag suction head; 204 - Inner bag spreading arm; 205 - Inner side pulling arm of the bag; 206 - Inner bag opening piece; 207 - Protective shell one; 208 - Protective shell two; 3 - Nitrogen filling and bag opening part; 301 - Nitrogen tank; 302 - Nitrogen filling pipe; 303 - Cylinder; 304 - Clamping seat; 305 - Column; 306 - Nitrogen filling head assembly; 307 - Main nitrogen filling head; 308 - Auxiliary nitrogen filling head; 309 - Valve core; 310 - Opening; 311 - Schematic rod; 312 - Spring; 4 - Machine base; 5 - Bag feeding part; 6 - Feeding part; 7 - Vacuum pumping part; 8 - Bag conveying part; 9 - Visual inspection part; 10 - Total control part; 11 - Rotary drive part. Detailed implementation mode

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0050] As Figures 1 to 6 shown, a nitrogen filling mechanism includes a rotary bag clamping part 1 for clamping and conveying packaging bags. An opening part 2 capable of opening the bag mouth of the packaging bag is installed beside the rotary bag clamping part 1. A nitrogen filling and bag opening part 3 for filling nitrogen into the bag mouth of the packaging bag is installed above the opening part 2. The nitrogen filling and bag opening part 3 includes a nitrogen filling pipe 302 communicating with a nitrogen tank 301. The nitrogen filling pipe 302 controls the nitrogen delivery through a cylinder 303, and high-pressure nitrogen is filled in the nitrogen tank 301. A nitrogen filling head assembly 306 is detachably installed at the end of the nitrogen filling pipe 302. The nitrogen filling head assembly 306 includes a main nitrogen filling head 307, and two auxiliary nitrogen filling heads 308 perpendicular to the bottom and communicating with both sides of the bottom of the main nitrogen filling head 307. This nitrogen filling mechanism blows the packaging bag by filling high-pressure nitrogen into the bag mouth of the packaging bag. When the packaging bag is vacuum sealed later, the gas remaining in the bag is nitrogen. Since nitrogen is more stable than air, it can effectively lock the freshness of the food in the bag, thereby extending the shelf life of the food.

[0051] As Figure 3 、 Figure 5 shown, the nitrogen filling pipe 302 is fixed in the clamping seat 304, and both the clamping seat 304 and the cylinder 303 are fixed on a vertically arranged column 305. In order to improve the stability during nitrogen filling, the nitrogen filling pipe 302 is fixed in the clamping seat 304, and then the clamping seat 304 is fixed on the column 305. At this time, the nitrogen filling pipe 302 is located above the packaging bag, and nitrogen is filled from top to bottom.

[0052] As Figures 3 to 6 shown, a valve core 309 located between two auxiliary nitrogen charging heads 308 is further assembled inside the main nitrogen charging head 307. Openings 310 communicating with the chambers of the auxiliary nitrogen charging heads 308 are formed on both sides of the valve core 309; a indicating rod 311 capable of extending outside the main nitrogen charging head 307 is connected to the bottom ends of the two valve cores 309, and a spring 312 for pushing the valve core 309 to move upward is sleeved on the indicating rod 311. In order to clearly indicate whether the nitrogen charging head assembly 306 is in the charging state, a traditional mechanical structure is adopted to indicate the charging state; when high-pressure nitrogen is not filled in the main nitrogen charging head 307, the valve core 309 is not communicated with the auxiliary nitrogen charging head 308 at this time and the indicating rod 311 is completely hidden inside the main nitrogen charging head 307; when high-pressure nitrogen is filled in the main nitrogen charging head 307, the valve core 309 is communicated with the auxiliary nitrogen charging head 308 through the openings 310 at this time and the indicating rod 311 extends outside the main nitrogen charging head 307; when the above mechanical structure is applied, it has a longer service life and lower cost.

[0053] As Figures 3 to 6 shown, paint with a color different from that of the main nitrogen charging head 307 and the auxiliary nitrogen charging head 308 is sprayed on the rod body of the indicating rod 311. In order to facilitate the visual inspection part 9 of the packaging machine to clearly identify the indicating rod 311, it is sprayed with paint of different colors, so as to facilitate the camera to identify.

[0054] As Figure 7 shown, the rotary bag clamping part 1 includes a rotary platform 101, and multiple groups of clamp arm 102 components are fixedly installed on the side surface of the rotary platform 101. Each group of clamp arm 102 components includes two clamp arms 102 arranged oppositely, and a clamping block 103 is rotatably installed at the end of each clamp arm 102. In order to clamp the packaging bag, the left and right sides of the bag mouth of the packaging bag are respectively clamped on the clamping blocks 103 of each group of clamp arm 102 components, and the bag opening and nitrogen charging of the packaging bag are completed one by one in a rotating manner.

[0055] As Figures 8 to 9As shown, the bag opening part 2 includes an outer bag opening member and an inner bag opening member; the outer bag opening member includes two relatively arranged outer bag opening arms 201, one end of the two outer bag opening arms 201 is movably connected by an outer bag connecting arm 202, and one end of each outer bag opening arm 201 away from the outer bag connecting arm 202 is connected with an outer bag suction head 203 through a suction pipe; the inner bag opening member includes two relatively arranged inner bag opening arms 204, and one side of the two inner bag opening arms 204 is movably connected with the two inner bag opening arms 204 through an inner bag pulling arm 205 at the same time, and an inner bag opening piece 206 is fixed at one end of each inner bag opening arm 204 away from the inner bag pulling arm 205; the outer bag opening member further includes a first protective shell 207 covering the outer bag opening arms 201; the inner bag opening member further includes a second protective shell 208 covering the inner bag opening arms 204 and the inner bag pulling arm 205 together. In order to open the bag mouth of the packaging bag, the two outer bag suction heads 203 respectively suck the outer side of the bag mouth of the packaging bag, the two inner bag opening pieces 206 are located inside the bag mouth of the packaging bag, and an inner bag pulling arm 205 actively drives the two inner bag opening arms 204 to expand outwards. At this time, the two outer bag opening arms 201 follow the inner bag opening arms 204 and expand outwards passively, so as to gradually open the bag mouth of the packaging bag; in order to protect the outer bag opening member and the inner bag opening member, all the movable parts are hidden in the protective shell, so as to improve the safety during the operation of the equipment.

[0056] Working principle of the nitrogen filling mechanism:

[0057] As Figure 2As shown in the figure, during application, the left and right sides of the bag mouth of the packaging bag are respectively clamped on the clamping blocks 103 of each set of clamping arm 102 components, and under the action of the rotating platform 101, the packaging bag is rotated to the position where the outer bag suction head 203 and the inner bag opening piece 206 are located; subsequently, the two outer bag suction heads 203 respectively suck the outer side of the bag mouth of the packaging bag, and the two inner bag opening pieces 206 are located inside the bag mouth of the packaging bag. A bag inner pulling arm 205 actively drives two bag inner opening arms 204 to expand outwards. At this time, two outer bag opening arms 201 then passively expand outwards following the bag inner opening arms 204, thereby gradually opening the bag mouth of the packaging bag; when the bag opening part 2 opens the bag mouth of the packaging bag, under the control of the air cylinder 303, a high-pressure nitrogen gas is filled into the opened bag mouth by the nitrogen filling head assembly 306. The packaging bag is fully inflated by the pressure of the nitrogen gas. At this time, the gas inside the packaging bag is nitrogen. When the packaging bag is subsequently vacuum-sealed, the remaining gas inside the bag is nitrogen. Since nitrogen is more stable than air, it can effectively lock the freshness of the food inside the bag, thereby extending the shelf life of the food. In order to clearly indicate whether the nitrogen filling head assembly 306 is in the inflation state, a traditional mechanical structure is used to indicate the inflation state; when no high-pressure nitrogen gas is filled into the main nitrogen filling head 307, at this time, the valve core 309 is not connected to the auxiliary nitrogen filling head 308 and the indicating rod 311 is completely hidden inside the main nitrogen filling head 307; when high-pressure nitrogen gas is filled into the main nitrogen filling head 307, at this time, the valve core 309 is connected to the auxiliary nitrogen filling head 308 through the opening 310 and the indicating rod 311 extends out of the main nitrogen filling head 307, thereby indicating the inflation state; when the above mechanical structure is applied, its service life is longer and the cost is lower.

[0058] As Figures 10 to 13 As shown in the figure, a nitrogen lock fresh packaging machine equipped with a nitrogen filling mechanism includes a machine base 4. The upper surface of the machine base 4 is equipped with the above-mentioned nitrogen filling mechanism. The upper surface of the machine base 4 is also equipped with a bag feeding part 5 and a feeding part 6 arranged in sequence around the nitrogen filling mechanism in a clockwise or counterclockwise direction. The upper surface of the machine base 4 is also equipped with a vacuum pumping part 7 arranged side by side with the nitrogen filling mechanism and a bag conveying part 8 beside the vacuum pumping part 7. The upper surface of the machine base 4 is also equipped with a visual inspection part 9 at multiple locations around the nitrogen filling mechanism and the vacuum pumping part 7 and a general control part 10 at one place. The lower surface of the machine base 4 is equipped with a rotary drive part 11 that drives the rotary bag clamping part 1 to rotate. When the packaging machine is working, the bag feeding part 5 pushes the packaging bag to the rotary bag clamping part 1 through the bag pushing part for clamping. The rotary bag clamping part 1 rotates the packaging bag to the bag opening part 2 to open the bag mouth of the packaging bag. Subsequently, the nitrogen filling and bag opening part 3 fills high-pressure nitrogen gas into the packaging bag. The rotary bag clamping part 1 rotates the packaging bag to the feeding part 6 to fill food into the packaging bag. The rotary bag clamping part 1 rotates the packaging bag to the vacuum pumping part 7, and through the bag pushing part, the packaging bag is sent into the vacuum chamber of the vacuum pumping part 7 to extract the excess nitrogen gas and then seal it. Finally, the packaging bag falls to the bag conveying part 8 for conveying out.

[0059] As Figures 10 to 12 shown, one of the visual inspection parts 9 is installed beside the bag opening part 2. The camera of the visual inspection part 9 faces the outer bag suction head 203 and the inner bag opening piece 206. The camera of the visual inspection part 9 can also clearly capture the paint color on the rod body of the indicating rod 311, so as to judge whether the indicating rod 311 extends downward. In order to identify whether the bag opening of the packaging bag is normal during opening, the visual inspection part 9 is used to monitor it in real time. In addition, the visual inspection part 9 is used to monitor whether the indicating rod 311 extends at the same time; when the indicating rod 311 can extend outside the main nitrogen filling head 307, it indicates that there is nitrogen passing through the main nitrogen filling head 307, and further indicates that the high-pressure nitrogen in the nitrogen tank 301 is sufficient; when the indicating rod 311 cannot extend outside the main nitrogen filling head 307, it indicates that there is no nitrogen passing through the main nitrogen filling head 307, and further indicates that the high-pressure nitrogen in the nitrogen tank 301 is insufficient. The visual inspection part 9 will feedback to the total control part 10 to stop the operation of the equipment. At this time, nitrogen needs to be replenished into the nitrogen tank 301 in time; thus, the function of one machine with multiple uses is realized, and at the same time, the monitoring of the nitrogen content in the nitrogen tank 301 is solved. Since the indicating rod 311 part is a mechanical part, its service life is longer and the cost is lower.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A nitrogen filling mechanism, characterized in that: It comprises a rotary bag clamping part for clamping and conveying the packaging bag, a bag opening part capable of opening the bag opening of the packaging bag is installed on one side of the rotary bag clamping part, and a nitrogen filling bag opening part for filling nitrogen into the bag opening of the packaging bag is installed above the bag opening part; The nitrogen filling and bag opening part includes a nitrogen filling pipe connected to a nitrogen tank, and the nitrogen filling pipe controls the nitrogen delivery through a cylinder, wherein the nitrogen tank is filled with high-pressure nitrogen; a nitrogen filling head assembly is detachably installed at the end of the nitrogen filling pipe, and the nitrogen filling head assembly includes a main nitrogen filling head, and two auxiliary nitrogen filling heads facing vertically downward are connected to the two sides of the bottom end of the main nitrogen filling head.

2. The nitrogen filling mechanism according to claim 1, characterized in that: The nitrogen filling pipe is fixed in the clamping seat, and the clamping seat and the cylinder are both fixed on a vertically arranged column.

3. The nitrogen filling mechanism according to claim 2, characterized in that: The main nitrogen filling head is also equipped with a valve core located between the two auxiliary nitrogen filling heads, and openings connected to the auxiliary nitrogen filling head chambers are provided on both sides of the valve core; the bottom ends of the two valve cores are connected to a signal rod that can extend to the outside of the main nitrogen filling head, and the signal rod is sleeved with a spring that pushes the valve core to move upward.

4. The nitrogen filling mechanism according to claim 3, characterized in that: When the main nitrogen filling head is not filled with high-pressure nitrogen, the valve core is not connected with the auxiliary nitrogen filling head and the indicator rod is completely hidden in the main nitrogen filling head; when the main nitrogen filling head is filled with high-pressure nitrogen, the valve core is connected with the auxiliary nitrogen filling head through the opening and the indicator rod extends out of the main nitrogen filling head.

5. The nitrogen filling mechanism according to claim 4, characterized in that: The rod body of the signal rod is sprayed with paint of a color different from that of the main nitrogen filling head and the auxiliary nitrogen filling head.

6. The nitrogen filling mechanism according to claim 5, characterized in that: The rotary bag clamping part comprises a rotating platform, and a plurality of groups of clamping arm components are fixedly installed on the side of the rotating platform. Each group of clamping arm components comprises two clamping arms arranged opposite to each other, and a clamping block is rotatably installed on the end of each clamping arm.

7. The nitrogen filling mechanism according to claim 6, characterized in that: The bag opening portion includes an outer bag opening component and an inner bag opening component; The bag opening member includes two bag opening arms arranged opposite to each other, one end of the two bag opening arms being movably connected via a bag connecting arm, and one end of each bag opening arm away from the bag connecting arm being connected to a bag suction head via a suction pipe; The bag opening member comprises two bag opening arms arranged opposite to each other, one side of the two bag opening arms is connected to the other side by a bag inner side pulling arm, and an bag opening piece is fixed to one end of each bag opening arm away from the bag inner side pulling arm; The bag outer opening component also includes a protective shell 1 covering the bag outer opening arm; the bag inner opening component also includes a protective shell 2 covering the bag inner opening arm and the bag inner side pulling arm.

8. A nitrogen fresh-keeping packaging machine equipped with a nitrogen filling mechanism, comprising a machine base, characterized in that: The upper surface of the machine base is installed with the nitrogen filling mechanism according to claim 7, and the upper surface of the machine base is also installed with a bag feeding part and a material feeding part which are sequentially arranged clockwise or counterclockwise around the nitrogen filling mechanism. The upper surface of the machine base is also installed with a vacuum pumping part arranged side by side with the nitrogen filling mechanism and a bag conveying part located next to the vacuum pumping part. The upper surface of the machine base is also installed with multiple visual inspection parts respectively around the nitrogen filling mechanism and the vacuum pumping part and a general control part, and the lower surface of the machine base is installed with a rotating driving part which drives the rotating bag clamping part to rotate.

9. According to the nitrogen fresh-keeping packaging machine equipped with a nitrogen filling mechanism as claimed in claim 8, one of the visual inspection parts is installed beside the bag opening part, and the camera of the visual inspection part faces the suction head outside the bag and the opening piece inside the bag, characterized in that: The camera of the visual inspection part can also clearly capture the paint color on the pole body, thereby determining whether the pole is extended downward.

10. The nitrogen fresh-keeping packaging machine equipped with a nitrogen filling mechanism according to claim 9, characterized in that: When the indicator rod can be extended out of the main nitrogen filling head, it indicates that nitrogen is passing through the main nitrogen filling head, which further indicates that the high-pressure nitrogen in the nitrogen tank is sufficient; when the indicator rod cannot be extended out of the main nitrogen filling head, it indicates that no nitrogen is passing through the main nitrogen filling head, which further indicates that the high-pressure nitrogen in the nitrogen tank is insufficient, and the visual detection part will feedback to the general control part to stop the equipment operation. At this time, it is necessary to replenish nitrogen in the nitrogen tank in time.

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