Automatic negative pressure vacuum nitrogen filling and sealing machine and control method thereof

Abstract

The application relates to the technical field of can sealing machines, in particular to an automatic negative pressure vacuum nitrogen-filling can sealing machine and a control method thereof, which comprises a machine table provided with a feeding unit and a discharging unit; a driving box installed above the machine table, a feeding disc rotatably connected below the driving box; a cover sealing unit and a sealing unit arranged below the driving box, a bottom cover bearing unit installed on the end face of the machine table, and a side sealing unit arranged on the side of the machine table and sealed around the periphery of the feeding disc, wherein the sealing unit, the bottom cover bearing unit and the side sealing unit jointly form a sealed space, the sealing unit, the bottom cover bearing unit and the side sealing unit are matched to form an independent sealed space around the periphery of the feeding disc and enclose a small-range local sealed environment at the corresponding station of the feeding disc; the feeding disc is separated from each other and does not interfere with each other when rotating, and is rapidly closed to form a seal after being rotated to the position.

Description

Technical Field

[0001] This invention relates to the field of can sealing machine technology, and in particular to an automatic negative pressure vacuum nitrogen filling can sealing machine and its control method. Background Technology

[0002] Currently, in the food, beverage and canned food processing industry, in order to extend the shelf life of products, it is usually necessary to vacuum the inside of the can before sealing and fill it with nitrogen to replace the residual oxygen, thereby inhibiting the oxidation and deterioration of the materials inside the can. This process requires the sealing equipment to establish an airtight sealed environment around the can before the bottle cap and the can body are rolled and sealed, so as to carry out vacuuming and nitrogen filling operations.

[0003] Rotary can sealing machines are widely used in high-speed continuous production scenarios due to their advantages such as high station conversion efficiency, compact structure, and small footprint. However, during operation, the feeding disc of a rotary can sealing machine needs to rotate intermittently in a horizontal plane. The cans on the feeding disc pass through the feeding, capping, and unloading stations in sequence. Because the feeding disc itself is in a state of constant rotation and stopping, it is difficult to establish a reliable dynamic sealing structure between it and the fixed parts. Therefore, conventional rotary can sealing machines can usually only perform capping operations under normal pressure and cannot complete the vacuuming and nitrogen filling of the can inside before capping. This greatly limits the application of this type of equipment in the field of high-end canning and preservation.

[0004] Therefore, in order to solve the above problems, we propose an automatic negative pressure vacuum nitrogen filling and sealing machine and its control method. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability to complete vacuuming and nitrogen filling of the can body before sealing, and to propose an automatic negative pressure vacuuming and nitrogen filling can sealing machine and its control method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The first aspect of this invention provides an automatic negative pressure vacuum nitrogen filling and sealing machine, comprising: A machine equipped with a loading unit and a unloading unit; and A drive box is installed above the machine, and a feeding tray is rotatably connected to the bottom of the drive box; A cover unit and a sealing unit are provided below the drive box. A bottom cover support unit is installed on the end face of the machine platform. A side sealing unit is also provided on the side of the machine platform to surround and seal the outer periphery of the feeding tray. The sealing unit, the bottom cover support unit and the side sealing unit together form a sealed space.

[0007] Furthermore, the feeding tray includes: The upper cover and the positioning part formed below the upper cover; A plurality of through holes are circumferentially distributed on the end face of the upper cover, and a positioning groove is provided on the periphery of the positioning part, which is directly opposite the plurality of through holes. The through hole has a stop portion formed inside to prevent the bottle cap from being stopped.

[0008] Furthermore, the sealing unit includes: The outer shaft rotatably connected to the lower part of the drive housing; and The inner shaft is coaxially disposed inside the outer shaft and can rotate independently relative to the outer shaft; Multiple abutting blocks are fixedly installed on the outer periphery of the outer shaft and rotate synchronously with the outer shaft; Multiple sealing clamps are pivotally connected to the lower end of the inner shaft and are evenly distributed circumferentially. During rotation, the contact block presses against the upper end of the sealing clamp, causing each sealing clamp to retract radially inward, thereby clamping and rolling the bottle cap to complete the sealing.

[0009] Furthermore, a fixed shaft is rotatably connected inside the inner shaft; The upper end of the fixed shaft extends into the interior of the drive box and is fixedly connected to the drive box. An adsorption rod is movably inserted into the interior of the fixed shaft, and a negative pressure connection mechanism is provided between the adsorption rod and the fixed shaft.

[0010] Furthermore, the negative pressure connection mechanism includes: A negative pressure hole is provided on the outside of the fixed shaft, and a connecting hole is provided at the bottom of the adsorption rod to its periphery. A spring is fixedly connected between the adsorption rod and the inner hole of the fixed shaft. When the adsorption rod moves upward, the connecting hole and the negative pressure hole are aligned in the radial direction and communicate with each other to form a negative pressure passage.

[0011] Furthermore, a wedge-shaped rod is movably inserted into the bottom of the fixed shaft via a compression spring, and a fixed cone block is fixedly installed on the upper side of the adsorption rod, while a movable cone block is slidably connected thereto. The movable cone block and the fixed cone block are arranged opposite to and symmetrically.

[0012] Furthermore, the sealing unit includes a sealing cover fixedly installed at the bottom of the drive box, and the sealing cover is sleeved on the outside of the sealing unit; A baffle plate is sealed and rotatably connected above the feeding tray, and the baffle plate is fixed below the sealing cover.

[0013] Furthermore, the bottom cover support unit includes: The first drive component and the second drive component are placed in the machine tool; A support platform is fixedly installed on the shaft end of the first driving member, and a slide is fixedly installed on the shaft end of the second driving member. The slide and the shaft end of the first driving member are slidably connected. A bottom cover is fixedly installed above the slide and is sleeved on the outside of the support platform.

[0014] Furthermore, the side sealing unit includes: A panel that is fixedly installed on the machine base; A U-shaped airbag is fixedly installed on the end face of the enclosure. The two sides of the U-shaped airbag surround the two sides of the positioning groove, and its upper side abuts against the lower side of the upper cover. An air cylinder is fixedly installed on the end face of the enclosure. An abutting rod is movably inserted into the inside of the air cylinder through a second compression spring. The abutting rod is opposite to the edge of the bottom cover. The air cylinder and the U-shaped airbag are connected by a pipeline.

[0015] A second aspect of this invention also provides a control method for an automatic negative pressure vacuum nitrogen filling and sealing machine, which is applied to the aforementioned automatic negative pressure vacuum nitrogen filling and sealing machine, and includes the following steps: The feeding unit transports the can to be sealed and the bottle cap to the corresponding station of the feeding tray, and at the same time, the bottom cover bearing unit is activated to rise and support the bottom of the can. The side sealing unit is driven to move closer to the outer periphery of the feeding tray, so that the sealing unit, the bottom cover bearing unit and the side sealing unit together enclose the sealing space; The sealed space is evacuated, and after reaching a preset vacuum level, nitrogen gas is introduced into the sealed space. The capping unit performs a rolling sealing operation on the can and cap located on the feeding tray; After the can is sealed, the sealing of the bottom cover support unit and the side sealing unit is released in sequence, and the finished can is sent out through the feeding unit.

[0016] The present invention proposes an automatic negative pressure vacuum nitrogen filling and sealing machine and its control method, the advantages of which are as follows: The present invention forms an independent sealed space on the outer periphery of the feeding tray by cooperating the sealing unit, the bottom cover bearing unit and the side sealing unit, and creates a small local sealed environment at the corresponding work position of the feeding tray; the feeding tray separates and does not interfere with each other when rotating, and closes quickly to form a seal after rotating to the position, and then performs vacuuming and nitrogen filling operations. In this way, vacuum sealing is directly realized on the rotary structure, which not only reduces equipment cost and floor space, but also meets the needs of continuous production. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the machine tool structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the machine tool structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the feeding tray structure of the present invention; Figure 5 This is a schematic diagram of the sealing unit structure of the present invention; Figure 6 This is a schematic diagram of the capping unit structure of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the capping unit structure of the present invention. Figure 2 ; Figure 8 This is a cross-sectional view of the capping unit of the present invention; Figure 9 for Figure 8 A magnified structural diagram of area A; Figure 10 This is a schematic diagram of the side sealing unit structure of the present invention; Figure 11 This is a schematic diagram of the bottom cover support unit structure of the present invention; Figure 12 This is a diagram showing the sealed state of the bottom cover support unit and the feeding tray of the present invention; Figure 13 This is a schematic diagram of the sealed space structure of the present invention.

[0018] In the diagram: 1. Feeding unit; 2. Unloading unit; 3. Machine base; 4. Drive box; 5. Feeding tray; 51. Top cover; 52. Positioning part; 53. Through hole; 54. Positioning groove; 55. Stop part; 6. Sealing unit; 61. Outer shaft; 62. Inner shaft; 63. Contact block; 64. Sealing clamp; 65. Fixed shaft; 66. Adsorption rod; 67. Negative pressure connection mechanism; 671. Negative pressure hole; 672. Connecting hole; 673. Spring; 674. Compression spring; 675. Wedge rod; 676. Fixed cone block; 677. Movable cone block; 7. Sealing unit; 71. Sealing cover; 72. Baffle plate; 8. Bottom cover bearing unit; 81. First driving component; 82. Second driving component; 83. Bearing platform; 84. Slide seat; 85. Bottom cover; 9. Side sealing unit; 91. Enclosure plate; 92. U-shaped airbag; 93. Air cylinder; 94. Second compression spring; 95. Abutment rod; 10. Sealed space. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figures 1-13As an embodiment of the present invention, an automatic negative pressure vacuum nitrogen filling and sealing machine is disclosed. Specifically, the sealing machine includes a machine base 3 equipped with a feeding unit 1 and a discharging unit 2. The feeding unit 1 and the discharging unit 2 are respectively responsible for the input of the cans to be sealed and the output of the finished cans, thereby forming a continuous flow operation. The feeding unit 1 and the discharging unit 2 can both adopt the conveyor belt mechanism in the prior art, which will not be described in detail here. The drive box 4 is installed above the machine base 3. A feeding disc 5 is rotatably connected to the lower part of the drive box 4. The drive box 4 contains a transmission mechanism for driving the feeding disc 5 to rotate, so that the feeding disc 5 rotates intermittently in the horizontal plane to realize the transfer of the tank between various work stations. A cover unit 6 and a sealing unit 7 are provided below the drive box 4. A bottom cover bearing unit 8 is installed on the end face of the machine base 1. A side sealing unit 9 is also provided on the side of the machine base 1 to surround and seal the outer periphery of the feeding tray 5. (Refer to...) Figure 13 The sealing unit 6, the bottom cover supporting unit 8, and the side sealing unit 9 together form a sealed space 10. The sealing unit 7 covers the upper side of the feeding tray 5 from above, the bottom cover supporting unit 8 supports and seals the bottom of the tank from below, and the side sealing unit 9 surrounds the outer periphery of the feeding tray 5 from the side. The three work together to form a relatively closed sealed space 10 at the corresponding work position of the feeding tray 5.

[0021] It is understandable that the formation of this sealed space 10 is a prerequisite for subsequent vacuuming and nitrogen filling operations. By establishing a negative pressure environment within the sealed space 10, air inside the tank can be effectively expelled, and then nitrogen can be introduced to replace residual oxygen, thereby extending the shelf life of the material inside the tank. Compared to traditional whole-machine sealing methods, this embodiment decomposes the sealing structure into independent upper, lower, and side modules, which reduces the processing difficulty of the sealing components and facilitates adaptive adjustments according to the tank size, improving the equipment's versatility and ease of maintenance.

[0022] Reference Figure 4 In some embodiments, the feeding tray 5 of the present invention includes: The upper cover portion 51 and the positioning portion 52 formed below the upper cover portion 51 are fixed relative to each other in the vertical direction, wherein the positioning portion 52 rotates synchronously with the upper cover portion 51. A plurality of through holes 53 are distributed circumferentially on the end face of the upper cover 51, and a positioning groove 54 is provided on the periphery of the positioning part 52, which is directly opposite to the plurality of through holes 53. The through hole 53 has a stop portion 55 formed inside to prevent the bottle cap from falling downwards. Specifically, when the capping mechanism places the bottle cap into the through hole 53, the stop portion 55 supports the edge of the bottle cap from below, keeping the bottle cap at a predetermined height within the through hole 53. The can is then lifted from below by the support platform 83 and contacts the bottle cap. The bottle cap will not fall off due to centrifugal force or vibration during the rotation of the feeding tray 5. At the same time, before the can is lifted, the bottle cap is always confined within the through hole 53, eliminating the need for an additional external clamping mechanism and simplifying the overall machine structure.

[0023] In some embodiments, the automatic negative pressure vacuum nitrogen filling and sealing machine of the present invention further includes a capping mechanism (not shown in the figure), which is used to convey bottle caps one by one into the through hole 53 of the feeding tray 5. The capping mechanism can be implemented by using a vibratory plate cap feeder in conjunction with a pneumatic cap feeding slide, or by using a mechanical gripping and translation mechanism. Its specific structure and working principle are well known to those skilled in the art, and the present invention will not elaborate on them.

[0024] Reference Figure 5 , Figure 6 , Figure 7 In an optional embodiment, the capping unit 6 of the present invention includes: The outer shaft 61 is rotatably connected to the lower part of the drive housing 4; and An inner shaft 62 is coaxially disposed inside the outer shaft 61 and can rotate independently relative to the outer shaft 61; multiple abutment blocks 63 are fixedly installed on the outer periphery of the outer shaft 61 and rotate synchronously with the outer shaft 61; multiple sealing clamps 64 are pivotally connected to the lower end of the inner shaft 62 and are evenly distributed circumferentially, wherein the abutment blocks 63 press against the upper end of the sealing clamps 64 during rotation, causing each sealing clamp 64 to retract radially inward, thereby clamping and rolling the bottle cap to complete the sealing.

[0025] Understandably, during the sealing operation, the outer shaft 61 and the inner shaft 62 rotate synchronously under the independent drive source in the drive box 4, but maintain a certain relative angle relationship between them. When the sealing clamp 64 rotates with the inner shaft 62 to the position corresponding to the contact block 63, the outer peripheral surface of the contact block 63 presses against the upper end of the sealing clamp 64, causing the sealing clamp 64 to swing inward around its pivot point, and the lower ends of each sealing clamp 64 synchronously retract radially inward. As the outer shaft 61 and the inner shaft 62 continue to rotate relative to each other, the sealing clamp 64 rolls along the outer periphery of the bottle cap in the retracted state, and presses the skirt or rolled edge of the bottle cap onto the flange structure of the can body through the rolling action, thus completing the sealing.

[0026] Reference Figure 7 , Figure 8In a further embodiment, the inner shaft 62 of the present invention is also rotatably connected to a fixed shaft 65. The upper end of the fixed shaft 65 extends into the interior of the drive box 4 and is fixedly connected to the drive box 4, meaning that the fixed shaft 65 remains stationary during operation. The inner shaft 62 is rotatably connected to the outer periphery of the fixed shaft 65 via a bearing, allowing the inner shaft 62 to rotate independently relative to the fixed shaft 65, while the fixed shaft 65 itself is unaffected by the rotation of the inner shaft 62. An adsorption rod 66 is movably inserted into the interior of the fixed shaft 65, and a negative pressure connection mechanism 67 is provided between the adsorption rod 66 and the fixed shaft 65.

[0027] The function of the negative pressure connection mechanism 67 is to control the connection between the adsorption rod 66 and the external negative pressure source during the lifting and lowering process. When the adsorption rod 66 is in the initial position, the negative pressure connection mechanism 67 is in the open state, and there is no suction at the lower end of the adsorption rod 66; when the adsorption rod 66 is lifted into position by the lifting action of the tank, the negative pressure connection mechanism 67 is turned on, and the external negative pressure is transmitted to the lower end of the adsorption rod 66 through the fixed shaft 65, thereby adsorbing and fixing the bottle cap.

[0028] Reference Figure 9 In an optional embodiment, the negative pressure connection mechanism 67 of the present invention includes: The negative pressure hole 671 is provided on the outside of the fixed shaft 65. The negative pressure hole 671 is opened on the side wall of the fixed shaft 65. Its outer end is connected to an external negative pressure source such as a vacuum pump through a pipeline, and its inner end extends to the inner wall of the fixed shaft 65. The bottom of the adsorption rod 66 has a through hole 672 extending to its periphery. A spring 673 is fixedly connected between the adsorption rod 66 and the inner hole of the fixed shaft 65. When the adsorption rod 66 moves upward, the through hole 672 and the negative pressure hole 671 are aligned in the radial direction and communicate with each other to form a negative pressure passage.

[0029] When the adsorption rod 66 is in its naturally extended position, the connecting hole 672 and the negative pressure hole 671 are axially offset from each other, and the air passage is disconnected. When the adsorption rod 66 is pushed upward by an external force and moves a certain distance, the connecting hole 672 and the negative pressure hole 671 are aligned in the radial direction and connected to each other. At this time, the external negative pressure is transmitted to the central negative pressure channel of the adsorption rod 66 through the negative pressure hole 671 and the connecting hole 672, and finally transmitted to the lower end of the adsorption rod 66 to achieve adsorption of the bottle cap.

[0030] In this embodiment, after the adsorption rod 66 adsorbs the bottle cap through negative pressure, the bottle cap remains stationary at the lower end of the adsorption rod 66, while the support platform 83 drives the tank to descend and reset first. The purpose of this design is to keep the bottle cap and the tank opening separate during the vacuuming process, leaving a gap between them for gas flow. Specifically, the first small upward movement of the support platform 83 is only used to push the tank opening to contact the bottle cap, pushing the adsorption rod 66 upward to conduct negative pressure. After the bottle cap is adsorbed and fixed, the support platform 83 immediately descends. At this time, the tank descends alone, while the bottle cap remains at its original height position due to being adsorbed and fixed by the adsorption rod 66. An annular gap is formed between the tank opening and the bottle cap, which connects the inside of the tank with the external sealed space 10.

[0031] During the vacuuming process, the air within the sealed space 10 is extracted, and the air inside the canister is discharged through the annular gap, ensuring that the canister reaches the same preset vacuum level as the sealed space 10 before sealing. If the cap is already pressed against the canister opening during vacuuming, the air inside the canister will be blocked from escaping, leading to an increase in residual oxygen and affecting the nitrogen filling effect. Therefore, this embodiment, through the above-mentioned timing design, keeps the cap and canister in a non-sealed contact state during the vacuuming stage, effectively solving the technical problem of the inability to extract gas from the canister.

[0032] After vacuuming and nitrogen filling are completed, the support platform 83 rises a large distance for the second time, pushing the can body from below to the bottle cap again. The mouth of the can body and the bottle cap are tightly pressed together. Then the capping unit 6 rolls and fixes the bottle cap to the mouth of the can body. After the can is sealed, the support platform 83 drives the finished can body and the bottle cap fixed on it to descend and reset together, ready to enter the unloading process.

[0033] Reference Figure 9 Furthermore, a wedge-shaped rod 675 is movably inserted into the bottom of the fixed shaft 65 via a compression spring 674, and a fixed cone block 676 is fixedly installed on the upper side of the adsorption rod 66 and a movable cone block 677 is slidably connected thereto. The movable cone block 677 is opposite to and symmetrically arranged with the fixed cone block 676.

[0034] When the adsorption rod 66 is lifted a short distance by the can for the first time, the fixed cone 676 moves up synchronously with the adsorption rod 66, and the movable cone 677 slides down relative to it under the action of gravity or spring. After the fixed cone 676 touches the wedge rod 675, it is locked and limited by the wedge rod 675. At this time, the adsorption rod 66 rises to the communication position where the connecting hole 672 and the negative pressure hole 671 are aligned to achieve adsorption of the bottle cap. When the vacuuming and nitrogen filling operations are completed and the capping is required, the support platform 83 rises a second large distance, and the tank pushes the cap again, causing the adsorption rod 66 to move further upward. After the adsorption rod 66 continues to rise, the inclined surface of the movable cone block 677 slides relative to the wedge-shaped surface of the wedge rod 675, pushing the wedge rod 675 back radially inward, and then extending outward under the elastic force of the compression spring 674, releasing the locking state of the adsorption rod 66.

[0035] Reference Figure 5 In an optional embodiment, the sealing unit 7 of the present invention includes a sealing cover 71 fixedly installed at the bottom of the drive box 4, and the sealing cover 71 is sleeved on the outside of the sealing unit 6; A baffle plate 72 is sealed and rotatably connected above the feeding tray 5. The baffle plate 72 is fixed below the sealing cover 71. The lower surface of the baffle plate 72 and the upper surface of the upper cover 51 of the feeding tray 5 form a sealed and rotatably connected relationship. That is, the baffle plate 72 is fixed and does not rotate, while the feeding tray 5 rotates around the vertical axis below it. The two are sealed together by a dynamic sealing structure such as an annular sealing ring.

[0036] Since the baffle plate 72 is fixed below the sealing cover 71 and rotates in a sealed manner with the upper cover 51 of the feeding tray 5, the baffle plate 72 always covers the top of the feeding tray 5 during the interval of the feeding tray 5's indexing rotation. This prevents external air from seeping in from the top of the feeding tray 5 during the vacuuming process and ensures that the feeding tray 5 does not interfere with the fixed parts when rotating. At the same time, the sealing cover 71 encloses the transmission parts of the sealing unit 6, so that the lubricating grease and wear particles of the transmission parts will not fall into the sealed space 10 and contaminate the can or bottle cap, thus ensuring the cleanliness of the sealing process.

[0037] Reference Figure 11 In an optional embodiment, the bottom cover support unit 8 of the present invention includes: The first drive component 81 and the second drive component 82 are placed in the machine base 3. In this embodiment, the first drive component 81 and the second drive component 82 are both set as cylinders. The first driving member 81 has a bearing platform 83 fixedly installed on its shaft end, and the second driving member 82 has a slide block 84 fixedly installed on its shaft end. The slide block 84 is slidably connected to the shaft end of the first driving member 81. A bottom cover 85 is fixedly installed above the slide block 84 and is sleeved on the outside of the bearing platform 83.

[0038] Furthermore, during the cap suction stage, the first driving component 81 first drives the support platform 83 to rise a short distance, pushing the can upward to contact the bottle cap, and pushing the adsorption rod 66 upward to conduct negative pressure; after the cap suction is completed, the first driving component 81 drives the support platform 83 to descend and reset, the can moves down accordingly, and the bottle cap remains in the adsorption position, and the two separate to form an exhaust gap.

[0039] Subsequently, the second drive unit 82 drives the slide 84 to rise, causing the bottom cover 85 to rise as well. The upper opening edge of the bottom cover 85 abuts against the lower edge of the positioning part 52, simultaneously enclosing the bottom of the tank and the outer periphery of the positioning part 52 of the feeding tray 5, forming a bottom seal. After the vacuuming and nitrogen filling operations are completed, the second drive unit 82 keeps the bottom cover 85 in the same position, and the first drive unit 81 drives the support platform 83 to rise a large distance again, pushing the tank upward from inside the bottom cover 85 to the cap, completing the pressing and sealing. After the cap is sealed, the first drive unit 81 and the second drive unit 82 descend separately or simultaneously, the support platform 83 and the bottom cover 85 reset, and the finished tank descends accordingly, entering the unloading station.

[0040] Of course, in this embodiment, an interface can be installed on the outside of the bottom cover 85 for connecting the vacuum and nitrogen gas. This is a conventional design method for those skilled in the art and will not be elaborated here.

[0041] Reference Figure 10 Furthermore, in this embodiment, the side sealing unit 9 includes: The enclosure 91 is fixedly installed on the machine base 3; A U-shaped airbag 92 is fixedly installed on the end face of the enclosure 91. The two sides of the U-shaped airbag 92 surround the two sides of the positioning groove 54, and its upper side abuts against the lower side of the upper cover 51. An air cylinder 93 is fixedly installed on the end face of the enclosure 91. An abutting rod 95 is movably inserted into the inside of the air cylinder 93 through a second compression spring 94. The abutting rod 95 is opposite to the edge of the bottom cover 85. The air cylinder 93 and the U-shaped airbag 92 are connected by pipeline.

[0042] In this embodiment, the enclosure plate 91 is fixedly installed on the machine base 3, located on the outer periphery of the feeding tray 5, with its end face facing the feeding tray 5. A U-shaped airbag 92 is fixedly installed on the end face of the enclosure plate 91 facing the feeding tray 5. The U-shaped airbag 92 has a U-shaped profile, with its two arms respectively surrounding the two sides of the positioning groove 54 of the feeding tray 5. The upper edge of the U-shaped airbag 92 is arranged opposite to the lower surface of the upper cover 51 of the feeding tray 5. An air cylinder 93 is fixedly installed on the end face of the enclosure plate 91, forming a sealed air chamber inside. A second compression spring 94 is disposed inside the air cylinder 93. One end of an abutment rod 95 is movably inserted into the air cylinder 93 and abuts against the second compression spring 94. The other end of the abutment rod 95 extends out of the air cylinder 93 and is arranged opposite to the outer periphery of the bottom cover 85. The air chamber of the air cylinder 93 is connected to the interior of the U-shaped airbag 92 through a pipeline.

[0043] Understandably, when the bottom cover 85 rises under the drive of the second drive member 82, the outer periphery of the bottom cover 85 gradually approaches and eventually abuts against the outer end of the abutment rod 95, pushing the abutment rod 95 to slide into the air cylinder 93, thereby compressing the gas inside the air cylinder 93 and increasing the air pressure inside the air cylinder 93. The compressed gas enters the U-shaped airbag 92 through the pipeline, causing the U-shaped airbag 92 to inflate. After inflation, the two arms of the U-shaped airbag 92 unfold outward and fit tightly against the two side walls of the positioning groove 54 of the feeding tray 5, and its upper edge expands upward and fits tightly against the lower surface of the upper cover 51, thereby achieving a lateral seal between the outer periphery of the feeding tray 5 and the area of ​​the positioning groove 54.

[0044] Furthermore, when the vacuuming and nitrogen filling operations are completed and the bottom cover 85 descends and resets under the drive of the second drive component 82, the outer periphery of the bottom cover 85 disengages from the contact rod 95. Under the elastic reset force of the second compression spring 94, the contact rod 95 extends outward from the air cylinder 93, the air cylinder 93 returns to normal pressure, and the gas in the U-shaped air bag 92 flows back to the air cylinder 93 through the pipeline. The U-shaped air bag 92 contracts and resets, releasing the seal on the outer periphery of the feeding disc 5. Thus, the U-shaped air bag 92 only expands and seals after the bottom cover 85 has risen to its position. During the rotation of the feeding disc 5, the U-shaped air bag 92 is in a contracted state, maintaining a gap with the feeding disc 5, and will not generate frictional resistance to the rotation of the feeding disc 5.

[0045] It is worth noting that this embodiment achieves lateral sealing through the inflation of the U-shaped airbag 92, which differs from traditional rigid sealing rings or brush sealing structures. The U-shaped airbag 92 is made of flexible materials such as rubber or silicone, and after inflation, it can adaptively conform to the irregular contour surface of the feeding tray 5, including both sides of the positioning groove 54 and the lower side of the upper cover 51. Even if there are manufacturing errors or installation misalignment in the feeding tray 5, the U-shaped airbag 92 can still achieve a tight fit through elastic deformation, exhibiting excellent sealing adaptability.

[0046] Furthermore, a second aspect of the present invention provides a control method for an automatic negative pressure vacuum nitrogen filling and sealing machine, which is applied to the aforementioned automatic negative pressure vacuum nitrogen filling and sealing machine, and specifically includes the following steps: S1. The can to be sealed and the bottle cap are transported to the corresponding station of the feeding tray 5 through the feeding unit 1, and the bottom cover bearing unit 8 is started to rise to support the bottom of the can. S2. Drive the side sealing unit 9 to move closer to the outer periphery of the feeding tray 5, so that the sealing unit 7, the bottom cover bearing unit 8 and the side sealing unit 9 together enclose the sealing space; S3. Vacuum the sealed space and fill it with nitrogen after reaching the preset vacuum level. S4, the capping unit 6 performs a rolling sealing operation on the can and the cap located on the feeding tray 5; S5. After sealing the can, release the sealing state of the bottom cover bearing unit 8 and the side sealing unit 9 in sequence, and send the finished can out through the feeding unit 2.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic negative pressure vacuum nitrogen filling and sealing machine, characterized in that, include: A machine (3) equipped with a feeding unit (1) and a discharging unit (2); and A drive box (4) is installed above the machine base (3), and a feeding tray (5) is rotatably connected to the bottom of the drive box (4). The drive box (4) is provided with a cover unit (6) and a sealing unit (7) below it. The end face of the machine base (1) is provided with a bottom cover support unit (8). The side of the machine base (1) is also provided with a side sealing unit (9) that surrounds and seals the outer periphery of the feeding tray (5). The sealing unit (6), the bottom cover support unit (8) and the side sealing unit (9) together form a sealed space (10).

2. The automatic negative pressure vacuum nitrogen filling and sealing machine according to claim 1, characterized in that: The feeding tray (5) includes: The upper cover (51) and the positioning part (52) formed below the upper cover (51). A plurality of through holes (53) are circumferentially distributed on the end face of the upper cover (51), and a positioning groove (54) is provided on the periphery of the positioning part (52) facing the plurality of through holes (53). The through hole (53) has a stop part (55) formed inside to stop the bottle cap.

3. The automatic negative pressure vacuum nitrogen filling and sealing machine according to claim 1, characterized in that: The sealing unit (6) includes: Rotatably connected to the outer shaft (61) below the drive housing (4); and The inner shaft (62) is coaxially disposed inside the outer shaft (61) and can rotate independently relative to the outer shaft (61); Multiple abutment blocks (63) are fixedly installed on the outer periphery of the outer shaft (61) and rotate synchronously with the outer shaft (61); Multiple sealing clamps (64) are pivotally connected to the lower end of the inner shaft (62) and are evenly distributed circumferentially. The contact block (63) presses against the upper end of the sealing clamp (64) during rotation, causing each sealing clamp (64) to retract radially inward, thereby clamping and rolling the bottle cap to complete the sealing.

4. An automatic negative pressure vacuum nitrogen filling and sealing machine according to claim 3, characterized in that: The inner shaft (62) is also rotatably connected to a fixed shaft (65). The upper end of the fixed shaft (65) extends into the interior of the drive box (4) and is fixedly connected to the drive box (4). An adsorption rod (66) is movably inserted into the interior of the fixed shaft (65), and a negative pressure connection mechanism (67) is provided between the adsorption rod (66) and the fixed shaft (65).

5. An automatic negative pressure vacuum nitrogen filling and sealing machine according to claim 4, characterized in that: The negative pressure connection mechanism (67) includes: A negative pressure hole (671) is provided on the outside of the fixed shaft (65), and a connecting hole (672) is provided at the bottom of the adsorption rod (66) extending to its periphery. A spring (673) is fixedly connected between the adsorption rod (66) and the inner hole of the fixed shaft (65). When the adsorption rod (66) moves upward, the connecting hole (672) and the negative pressure hole (671) are aligned in the radial direction and communicate with each other to form a negative pressure passage.

6. An automatic negative pressure vacuum nitrogen filling and sealing machine according to claim 5, characterized in that: The bottom of the fixed shaft (65) is movably connected to a wedge rod (675) via a compression spring (674). The upper side of the adsorption rod (66) is fixedly installed with a fixed cone block (676) and slidably connected with a movable cone block (677). The movable cone block (677) is opposite to and symmetrically arranged with the fixed cone block (676).

7. An automatic negative pressure vacuum nitrogen filling and sealing machine according to claim 1, characterized in that: The sealing unit (7) includes a sealing cover (71) fixedly installed at the bottom of the drive box (4), and the sealing cover (71) is sleeved on the outside of the cover unit (6); A baffle plate (72) is sealed and rotatably connected above the feeding tray (5), and the baffle plate (72) is fixed below the sealing cover (71).

8. An automatic negative pressure vacuum nitrogen filling and sealing machine according to claim 2, characterized in that: The bottom cover support unit (8) includes: The first drive unit (81) and the second drive unit (82) are placed in the machine base (3); The first drive member (81) has a bearing platform (83) fixedly installed on its shaft end, and the second drive member (82) has a slide block (84) fixedly installed on its shaft end. The slide block (84) is slidably connected to the shaft end of the first drive member (81). A bottom cover (85) is fixedly installed above the slide block (84), and the bottom cover (85) is sleeved on the outside of the bearing platform (83).

9. An automatic negative pressure vacuum nitrogen filling and sealing machine according to claim 8, characterized in that: The side sealing unit (9) includes: A partition (91) is fixedly installed on the machine base (3); A U-shaped airbag (92) is fixedly installed on the end face of the enclosure (91). The two sides of the U-shaped airbag (92) surround the two sides of the positioning groove (54), and its upper side abuts against the lower side of the upper cover (51). An air cylinder (93) is fixedly installed on the end face of the enclosure (91). An abutting rod (95) is movably inserted into the inside of the air cylinder (93) through a second compression spring (94). The abutting rod (95) is opposite to the edge of the bottom cover (85). The air cylinder (93) and the U-shaped airbag (92) are connected by pipeline.

10. A control method for an automatic negative pressure vacuum nitrogen filling and sealing machine, applied to the automatic negative pressure vacuum nitrogen filling and sealing machine as described in claim 1, characterized in that, Includes the following steps: The loading unit (1) transports the can to be sealed and the bottle cap to the corresponding station of the feeding tray (5), and at the same time, the bottom cover bearing unit (8) is activated to rise and support the bottom of the can. Drive the side sealing unit (9) to move closer to the outer periphery of the feeding tray (5), so that the sealing unit (7), the bottom cover bearing unit (8) and the side sealing unit (9) together enclose the sealing space; The sealed space is evacuated, and after reaching a preset vacuum level, nitrogen gas is introduced into the sealed space. The capping unit (6) performs a rolling sealing operation on the can and the cap located on the feeding tray (5); After sealing the can, the sealing state of the bottom cover bearing unit (8) and the side sealing unit (9) is released in sequence, and the finished can is sent out through the feeding unit (2).

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