Vacuum sealing device and method for food packaging bag

Abstract

The present invention discloses a vacuum sealing device and method for food packaging bags, which relates to the technical field of vacuum sealing devices, including a rotating table main body, a clamping assembly arrayed at equal intervals on the rotating table, the clamping assembly including a fixed cover and a movable cover that cooperate with each other, the fixed cover and the movable cover having opposite sides connected to a clamping frame and a sealing frame located above the clamping frame, an elliptical air extraction pipe provided in the fixed cover, and the air extraction pipe externally connected to a negative pressure device. The vacuum sealing device and method for food packaging bags of the present invention can reduce the vacuum extraction area through two heat sealings, avoiding vacuum leakage due to an overly large opening, and at the same time, regardless of the thickness of the packaging bag, can cut off the oil circuit when the pressure is reached to maintain the heat-sealed state of the packaging bag, thereby improving the constant pressure during heat sealing.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum sealing devices, and more particularly to a vacuum sealing device and method for food packaging bags. Background Art

[0002] The vacuum sealing device for food packaging, known as a vacuum packaging machine or vacuum sealer, is a device used to remove air from packaging bags. This equipment is primarily used to extend the shelf life of food, reduce oxidation, and protect food from contamination and moisture. By extracting air from the packaging bag, creating a near-vacuum state, it effectively preserves the freshness and flavor of the food.

[0003] Chinese patent application number 202310124491.X discloses a vacuum sealer for food processing. The structure includes a box body with an inclined plate fixedly mounted on the upper surface of the box body. Side plates are symmetrically fixedly mounted at both ends of the inclined plate. A block is fixedly mounted on one side of the side plate, and a support plate is fixedly mounted on the other side of the side plate. Both the block and support plate are fixedly mounted on the upper surface of the box body. A guide groove is formed on one side of the upper surface of the side plate. A crossbeam is fixedly mounted above the guide groove. A screw hole block is fixedly mounted in the middle of the upper surface of the crossbeam. A telescopic rod is fixedly mounted in the middle of the lower surface of the crossbeam. A heat-sealing plate is fixedly mounted at the bottom end of the telescopic rod, which is slidably connected to the guide groove. An air nozzle mechanism is slidably connected to the middle of the support plate. This device improves sealing performance.

[0004] Chinese patent application number 202011340402.8 discloses a vacuum sealing packaging machine comprising an upper cover, a lower base, a rotating shaft, and a controller. A vacuum pump is located at one end of the lower base; a second heating strip is located at the other end; a first clamping block, a first spring, and a second clamping block are positioned within a T-shaped slideway; a first groove is defined in the lower base; mounting plates are connected at both ends of the first groove; an elastic sealing band is connected to one end of the mounting plate; and the other end of the elastic sealing band is connected to a slider. This device limits the position of packaging bags and prevents them from slipping.

[0005] The current vacuum packaging device still has the following problems:

[0006] 1. When heat-sealing vacuum packaging, bags of different thicknesses require different amounts of pressure from the heat-sealing head. Since the bags are relatively thin, it is not convenient to manually and accurately adjust the depth of pressure, which will affect the effect of heat sealing and thus the sealing of the packaging.

[0007] 2. When the vacuum tube is removed from the bag mouth after vacuuming, air will flow back into the bag from the gap, thereby affecting the vacuum degree in the bag. At the same time, wrinkles will appear at the bag mouth when the vacuum tube is pulled out, thereby affecting the sealing effect.

[0008] 3. When the vacuum tube is inserted into the packaging bag, wrinkles will appear at the bag opening, affecting the flatness of the bag opening, resulting in a decrease in the subsequent vacuuming and sealing effects.

[0009] Therefore, it is necessary to propose a vacuum sealing device and method for food packaging bags to solve the above problems. Summary of the Invention

[0010] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a vacuum sealing device and method for food packaging bags to solve the problems raised in the above background technology.

[0011] The technical solution is as follows: the present invention comprises a rotating table main body, a clamping assembly arrayed at equal intervals on the rotating table, the clamping assembly comprising a fixed cover and a movable cover that cooperate with each other, the opposite sides of the fixed cover and the movable cover are connected to a clamping frame and a sealing frame located above the clamping frame, an elliptical exhaust pipe is provided in the fixed cover, the exhaust pipe is externally connected to a negative pressure device, and a symmetrical receiving groove is provided on the sealing frame to cooperate with the exhaust pipe;

[0012] A first accommodating cavity is defined inside the sealing frame, and second accommodating cavities communicating with the first accommodating cavity are defined at both ends of the first accommodating cavity, and a side heat sealing assembly is slidably connected to the second accommodating cavity;

[0013] The interior of the first accommodating chamber is connected to a lifting hydraulic rod, the output end of the lifting hydraulic rod is connected to an extension cylinder, the output end of the extension cylinder is connected to a roller frame, the roller frame is connected to a sealing assembly and a shaping assembly located above the sealing assembly, and the sealing assembly and the shaping assembly are externally connected to a rotating drive device.

[0014] Furthermore, the side heat sealing assembly includes a heat sealing pressure head and a side hydraulic cylinder. The axial direction of the side hydraulic cylinder is parallel to the second accommodating chamber. The side hydraulic cylinder includes a sleeve and an extension rod sleeved in the sleeve. The end of the extension rod away from the sleeve is connected to the heat sealing pressure head. A two-way oil circuit is opened inside the extension rod, and the two-way oil circuit controls the extension and retraction of the extension rod in the sleeve.

[0015] One end of the extending rod is connected to a fixed platform located on the heat sealing pressure head, and the two-way oil circuit passes through the inside of the fixed platform. A first sliding cavity is provided inside the fixed platform, and a connecting block is connected to the first sliding cavity for sliding up and down. A through hole is provided inside the connecting block that matches the two-way oil circuit, and the top of the connecting block is externally connected to a lifting drive device.

[0016] Furthermore, the end of the extension rod close to the heat sealing head is connected to a fixed block, the interior of the fixed block is slidably connected to a moving block, the side of the moving block away from the fixed block is connected to the heat sealing head, an extrusion oil chamber is provided between the fixed block and the moving block, and the extrusion oil chamber is filled with hydraulic oil;

[0017] An active block and a driven block are slidably connected in the connecting block. The moving direction of the active block is the same as that of the connecting block, and the moving direction of the driven block is perpendicular to that of the active block. An oblique sliding groove is provided on the active block, and a pin located in the sliding groove is connected to the driven block. An inclined portion is provided on one end of the driven block close to the connecting block, and a groove for accommodating the inclined portion is provided on the connecting block. The active block drives the driven block to insert into the groove on the connecting block.

[0018] Furthermore, a second sliding chamber is opened inside the connecting block, the active block is slidably connected to the second sliding chamber, the bottom of the second sliding chamber is slidably connected to the second piston plate, the second piston plate and the extrusion oil chamber are connected by a spring, the bottom of the active block is connected to an extension rod in contact with the second piston plate, and the top of the active block and the second sliding chamber are connected by a spring.

[0019] Furthermore, a pressure sensor is connected to the inner wall of the extrusion oil chamber, a receiving chamber is provided in the second accommodating chamber, the sleeve is located in the receiving chamber, a fourth sliding chamber is provided on the side wall of the receiving chamber, a positioning block is slidably connected in the fourth sliding chamber, a groove matching the positioning block is provided on the sleeve, an electromagnet is connected to the inner wall of the fourth sliding chamber, the electromagnet pushes the positioning block to be inserted into the groove of the sleeve, and the electromagnet is electrically signal-connected to the pressure sensor.

[0020] Furthermore, the shaping component includes a central column and an anti-slip sleeve mounted on the central column, one end of the central column is fixedly connected to the roller frame, one end of the anti-slip sleeve is rotatably connected to the roller frame, an air suction groove is opened inside the central column, one end of the central column is externally connected to a negative pressure device, the air suction groove is connected to the negative pressure device, air inlet holes that match the air suction groove are opened at equal intervals on the anti-slip sleeve, and one end of the anti-slip sleeve is externally connected to a rotating drive structure.

[0021] Furthermore, the sealing assembly includes a heat-sealing roller and a distance measuring cylinder connected to both ends of the heat-sealing roller, and the distance measuring cylinder is rotatably connected to the roller frame;

[0022] The roller frame is connected to a motor, an output end of the motor is connected to a driving gear, one end of the distance measuring cylinder is connected to a driven gear meshing with the driving gear, and the driving gear and the anti-slip sleeve are connected through a chain transmission structure.

[0023] Furthermore, the top of the fixed cover is connected to a first cylinder, the exhaust pipe is connected to the output end of the first cylinder, the inside of the movable cover and the fixed cover are both connected to a second cylinder, the sealing frame is connected to the output end of the second cylinder, the clamping frame includes a fixed plate, and movable plates located on both sides of the fixed plate, the top of the movable plate is rotatably connected to a clamping claw, the side of the fixed plate away from the exhaust pipe is connected to a third cylinder, and a connecting rod is connected between the output end of the third cylinder and the movable plate;

[0024] A suction cup frame is connected to one side of the symmetrical fixed plate facing each other, a fourth cylinder is connected between the suction cup frame and the fixed plate, and the suction cup on the suction cup frame is externally connected to a negative pressure device.

[0025] Furthermore, the interior of the movable plate is connected to a fifth cylinder, the interior of the clamp is fixedly connected to a rotating tube, an oblique sliding groove is provided inside the rotating tube, and the protruding end of the fifth cylinder is connected to a slider located in the oblique sliding groove.

[0026] A vacuum extraction method for a food packaging bag comprises the following steps:

[0027] S1. Loading: The loading device places the packaging bag on the clamping frame, the clamping claw rotates to clamp the packaging bag, the movable cover flips down, and the symmetrical clamping frame clamps the packaging bag;

[0028] S2. Flattening: The suction cup frame generates negative pressure, and the fourth cylinder drives it to extend and retract, opening the bag mouth, inserting the suction tube into the bag, and then the movable plate extends to both sides to flatten the bag;

[0029] S3. Vacuuming: The sealing frames on both sides extend to clamp the bag opening. The heat sealing heads in the sealing frames extend first to heat-seal both ends of the bag opening. The external negative pressure device extracts the gas in the packaging bag through the vacuum pipe.

[0030] S4, Sealing: The first cylinder drives the vacuum tube to retract upward. At this time, the roller frame drives the shaping component and the sealing component to press on the packaging bag and move upward synchronously with the vacuum tube. The shaping component on the roller frame rotates to shape the packaging bag, and the sealing component seals the bag opening.

[0031] S5, unloading: After the sealing is completed, the movable cover opens upwards, the clamping claws rotate in the opposite direction, and lose the ability to fix the packaging bag. At this time, the packaging bag falls onto the conveyor belt below.

[0032] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0033] 1. The device is provided with a first accommodating cavity and a second accommodating cavity in the clamping frame. The first accommodating cavity and the second accommodating cavity have an overlapping area. Through two heat sealing operations, the vacuum extraction area can be reduced, and vacuum leakage due to an excessively large opening can be avoided, thereby improving the sealing performance after heat sealing.

[0034] 2. This device is equipped with an extrusion oil chamber on the heat sealing head. When the extrusion oil chamber is squeezed, it can drive the active block to move upward, thereby causing the connecting block to move upward, cutting off the oil supply pipeline, and preventing the heat sealing head from moving further. It has the function of constant pressure and fixation. Regardless of the thickness of the packaging bag, it can cut off the oil circuit when the pressure is reached to maintain the heat sealing state of the packaging bag, thereby improving the constant pressure during heat sealing.

[0035] 3. The pressure sensor and electromagnet of this device are arranged in coordination. When the thickness of the packaging bag becomes thinner, the reduced pressure can drive the electromagnet to operate, so that the side hydraulic cylinder retracts into the storage chamber and can be separated from the packaging bag in time after heat sealing, avoiding over-heat sealing and improving the heat sealing effect.

[0036] 4. This device is equipped with a heat-sealing roller and a distance-measuring cylinder, which can rise synchronously with the vacuum tube. It has the function of heat-sealing the packaging bag while pulling out the vacuum tube, avoiding air backflow when the vacuum tube is pulled out, and improving the sealing performance.

[0037] 5. This device is equipped with a shaping component above the heat sealing drum, which can flatten the mouth of the packaging bag when the vacuum tube is pulled out, thereby improving the effect of subsequent heat sealing and improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of the rotating table body and the fixed cover in the present invention;

[0039] Figure 2 A schematic diagram of the fixed cover and movable cover structure of the present invention;

[0040] Figure 3 A schematic diagram of the first accommodating cavity and the second accommodating cavity structures in the present invention;

[0041] Figure 4 Schematic diagram of the reduction bracket and the raised portion structure of the present invention;

[0042] Figure 5 A schematic diagram of the sleeve and extension rod structure of the present invention;

[0043] Figure 6 Schematic diagram of the structure of the fixing platform and the connecting block in the present invention;

[0044] Figure 7Schematic diagram of the heat sealing roller and anti-slip sleeve structure of the present invention;

[0045] Figure 8 Schematic diagram of the center column and anti-slip sleeve structure of the present invention;

[0046] Figure 9 Schematic diagram of the heat sealing roller and distance measuring cylinder structure in the present invention;

[0047] Figure 10 A schematic diagram of the movable cover and opening and closing frame structure of the present invention;

[0048] Figure 11 Schematic diagram of the fixed plate and movable plate structure in the present invention.

[0049] Reference numerals:

[0050] 100, rotary table body; 101, fixed cover; 102, movable cover; 103, clamping frame; 104, sealing frame; 105, exhaust pipe; 106, receiving groove; 107, sealing strip; 108, first receiving chamber; 109, second receiving chamber; 110, lifting hydraulic rod; 111, extending oil cylinder; 112, roller frame; 201, heat sealing head; 202, sleeve; 203, extending rod; 204, first oil pipeline; 205, second oil pipeline; 206, first piston plate; 207, fixed table; 208, first sliding chamber; 209, connecting block; 210, fixed block; 211, movable block; 212, extrusion oil chamber; 213, second sliding chamber; 214, third sliding chamber; 215, active block; 216, driven block; 217, sliding groove; 218, inclined portion; 219, second piston plate; 220, extension rod; 301, raised portion; 302, storage chamber; 303, fourth sliding chamber; 304, positioning block; 305, electromagnet; 306, reset bracket; 307, reset rod; 401, heat sealing roller; 402, distance measuring cylinder; 501, center column; 502, anti-slip sleeve; 503, suction groove; 504, motor; 505, driving gear; 5 06. Driven gear; 507. Chain transmission structure; 601. First cylinder; 602. Second cylinder; 603. Fixed plate; 604. Movable plate; 605. Clamping claw; 606. Third cylinder; 607. Connecting rod; 608. Suction cup frame; 609. Fourth cylinder; 610. Rotating tube; 611. Oblique slide; 612. Opening and closing frame; 613. Fifth cylinder; 614. Sixth cylinder. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0052] Depend on Figures 1 to 11 The invention provides a rotating table body 100, a clamping assembly arranged at equal intervals on the rotating table, and the rotating table body 100 is a turntable-type rotating device with a rotating drive device installed inside. The rotating table body 100 can drive the processing station above to rotate, so as to perform continuous work of different stations. It is widely used in automation equipment. This is an existing device and will not be described in detail here. The clamping assembly includes a fixed cover 101 and a movable cover 102 that cooperate with each other. The opposite sides of the fixed cover 101 and the movable cover 102 are connected to a clamping frame 103 and a sealing frame 104 located above the clamping frame 103. When the movable cover 102 is covered on the fixed cover 101, the internal clamping frame 10 3 and the sealing frame 104 are symmetrical and located on both sides of the packaging bag. An elliptical exhaust pipe 105 is provided in the fixed cover 101. Compared with the circular exhaust pipe 105, the elliptical exhaust pipe 105 can avoid excessive deformation of the packaging bag when the sealing frame 104 clamps the packaging bag, that is, the exhaust pipe 105 and the symmetrical sealing frame 104 are located at three intersections of the packaging bag. The exhaust pipe 105 is externally connected to a negative pressure device to extract the air in the packaging bag through the negative pressure device. The symmetrical sealing frame 104 is provided with a receiving groove 106 that cooperates with the exhaust pipe 105. The sealing frame 104 is connected to a sealing strip 107. Referring to 3, the sealing strip 107 is in the shape of a long mouth.

[0053] When vacuuming the packaging bag, since the bag opening is too large, air leakage may occur on both sides or part of the bag opening during vacuuming. The following is a structure to reduce the vacuuming area: Figure 3 and Figure 4 The sealing frame 104 is provided with a first accommodating cavity 108 and second accommodating cavities 109 at both ends of the first accommodating cavity 108. The first accommodating cavity 108 and the second accommodating cavity 109 are located on the same horizontal plane. The second accommodating cavity 109 is a parallelogram and overlaps with the first accommodating cavity 108 at one corner thereof. A side heat sealing assembly is slidably connected to the second accommodating cavity 109. Figure 4When the side heat sealing assembly extends from the second accommodating cavity 109, part of the structure will enter the area of the first accommodating cavity 108. However, it should be noted that even when extended, it is located on both sides of the exhaust pipe 105 and does not come into contact with the package at the exhaust pipe 105.

[0054] Since the shape of the bag opening is changed when the vacuum tube 105 is inserted into the bag, wrinkles will be caused at the extraction position when the vacuum tube 105 is pulled out. The following provides a structure for shaping the extraction position to make it flat: Figure 3 and Figure 4 The interior of the first accommodating chamber 108 is connected to a lifting hydraulic rod 110, and the lifting hydraulic rod 110 moves up and down synchronously with the exhaust pipe 105. The output end of the lifting hydraulic rod 110 is connected to an extension cylinder 111, and the output end of the extension cylinder 111 is connected to a roller frame 112. The extension cylinder 111 is used to press the roller frame 112 onto the packaging bag. The roller frame 112 is connected to a sealing assembly and a shaping assembly located above the sealing assembly. The sealing assembly and the shaping assembly are externally connected to a rotation drive device. Specifically, the shaping assembly rotates upward to flatten the packaging bag upward, and the sealing assembly rotates downward to keep consistent with the upward movement speed of the roller frame 112, so that the position in contact with the packaging bag during heat sealing remains relatively stationary.

[0055] Since the second accommodating cavity 109 is a parallelogram, a structure capable of pushing the side heat sealing assembly to move in parallel is required to keep the side heat sealing assembly parallel to the packaging bag, otherwise the sealing will not be tight. The following provides a structure to keep them parallel: Specifically, refer to Figure 4 and Figure 5The side heat sealing assembly includes a heat sealing pressure head 201 and a side hydraulic cylinder. The heat sealing pressure head 201 is a device for heat sealing and pressing the packaging bag, also known as a heat sealing strip, heat sealing head, heat sealing knife, heating strip, etc., preferably a heat sealing knife. The axial direction of the side hydraulic cylinder is parallel to the second accommodating cavity 109, so that the heat sealing pressure head 201 can also remain parallel to the packaging bag when extended. The side hydraulic cylinder includes a sleeve 202 and an extension rod 203 located inside the sleeve 202. One end of the sleeve 202 is connected to the second accommodating cavity 109. When the extension rod 203 is extended from the sleeve 202, it can push the heat sealing pressure head 201 to press on the packaging bag. One end of the rod 203 away from the sleeve 202 is connected to the heat sealing pressure head 201, and a first oil pipeline 204 and a second oil pipeline 205 are provided inside the extension rod 203. By switching the flow direction of the hydraulic oil in the first oil pipeline 204 and the second oil pipeline 205, the extension and retraction of the side hydraulic cylinder can be controlled. The end of the extension rod 203 located in the sleeve 202 is connected to the first piston plate 206, one end of the first oil pipeline 204 is located on the outer wall of the extension rod 203 close to the first piston plate 206, and one end of the second oil pipeline 205 is located at the end of the extension rod 203 close to the first piston plate 206. Figure 5 When hydraulic oil is input into the first oil pipeline 204, the extension rod 203 will retract into the sleeve 202. When hydraulic oil is input into the second oil pipeline 205, the extension rod 203 will extend from the sleeve 202.

[0056] When the heat sealing head 201 is pressed on the package, it needs to be kept for a certain period of time to allow sufficient heat transfer and improve the sealing effect. The following provides a structure to keep the heat sealing head 201 in a pressed state: Figure 6The end of the heat sealing head 201 close to the extension rod 203 is connected to a fixed platform 207, one end of the fixed platform 207 is connected to the extension rod 203, the first oil pipeline 204 and the second oil pipeline 205 pass through the interior of the fixed platform 207, the interior of the fixed platform 207 is provided with a first sliding cavity 208, the first sliding cavity 208 is connected to a connecting block 209 that slides up and down, the connecting block 209 slides up and down in the first sliding cavity 208, the interior of the connecting block 209 is provided with a through hole that matches the first oil pipeline 204 and the second oil pipeline 205, specifically, the connecting block A through hole is provided on the upper part of 209, but not on the lower part. When the connecting block 209 moves to the top, the lower part will block the first oil pipeline 204 and the second oil pipeline 205, blocking the oil circuit so that the side hydraulic cylinder no longer extends. The top of the connecting block 209 is externally connected to a lifting drive device, and the first oil pipeline 204 and the second oil pipeline 205 are externally connected to an oil supply device. When the external lifting drive device connected to the top of the connecting block 209 is actuated, it will drive the connecting block 209 to move upward, thereby cutting off the first oil pipeline 204 and the second oil pipeline 205, so that the side hydraulic cylinder remains extended.

[0057] Since the thickness of each packaging bag is different, different pressure states are required, otherwise it will affect the heat sealing thickness of the packaging. The following provides a structure that automatically stops the extension amount according to the pressure: Specifically, refer to Figure 5 and Figure 6 A fixed block 210 and a movable block 211 are provided between the heat sealing head 201 and the extending rod 203. The fixed block 210 is connected to the extending rod 203, and the movable block 211 is connected to the heat sealing head 201. The movable block 211 is slidably connected to the inside of the fixed block 210. When the heat sealing head 201 is pressed on the packaging bag, the movable block 211 will be pressed into the fixed block 210. An extrusion oil chamber 212 is provided between the fixed block 210 and the movable block 211. The extrusion oil chamber 212 is filled with hydraulic oil. When the hydraulic oil is squeezed, it enters the second sliding chamber 213, thereby pushing the second piston plate 219 to move upward;

[0058] The connecting block 209 needs an external lifting drive device to drive it to move its position, which requires back and forth control, which is very troublesome. The following provides a structure that can automatically drive the connecting block 209 to move: Figure 6, the interior of the connecting block 209 is provided with a second sliding chamber 213 and a third sliding chamber 214, the second sliding chamber 213 and the third sliding chamber 214 are arranged vertically, the bottom of the extrusion oil chamber 212 and the second sliding chamber 213 are connected, so that the hydraulic oil can enter the second sliding chamber 213, the second sliding chamber 213 is connected with an active block 215 for sliding up and down, the third sliding chamber 214 is connected with a driven block 216 for sliding horizontally, the active block 215 is provided with an obliquely arranged sliding groove 217, the driven block 216 is connected to a pin located in the sliding groove 217, specifically, when the active block 215 moves upward, the driven block 216 will slide toward The end away from the connecting block 209 is pushed, so that the connecting block 209 is separated from the driven block 216 and the connecting block 209, and the control function of the connecting block 209 is lost. The end of the driven block 216 close to the connecting block 209 is provided with an inclined portion 218. When the connecting block 209 moves from the top to the bottom, it is pushed into the third sliding cavity 214 by the inclined portion 218, and then the connecting block 209 moves to the bottom. The connecting block 209 is provided with a groove for accommodating the inclined portion 218. The top of the connecting block 209 and the first sliding cavity 208 are connected by a spring. When the connecting block 209 moves to the bottom, the inclined portion 218 on one side of the driven block 216 is inserted into the groove on the connecting block 209, thereby limiting the connecting block 209.

[0059] The active block 215 needs a driving structure to move it upward. The control of the driving device is very cumbersome. The following provides a structure that can drive it to move according to the internal pressure of the extrusion oil chamber 212 and can adapt to packages of different thicknesses: Figure 6 The bottom of the second sliding chamber 213 is slidably connected to a second piston plate 219. When the extrusion oil chamber 212 is squeezed, the internal space will become smaller, and the hydraulic oil will enter the second sliding chamber 213, thereby pushing the second piston plate 219 to move upward. The second piston plate 219 and the extrusion oil chamber 212 are connected by a spring. When the internal hydraulic oil is not squeezed, the spring drives the second piston plate 219 to reset and pull the hydraulic oil back into the extrusion oil chamber 212. The bottom of the active block 215 is connected to an extension rod 220 that contacts the second piston plate 219 to prevent the second piston plate 219 from moving to the position of the third sliding chamber 214. Therefore, an extension rod 220 is provided at the bottom of the active block 215. When the second piston plate 219 moves upward, the active block 215 is pushed to move by the extension rod 220. The driven block 216 and the third sliding chamber 214 are connected by a spring. The top of the active block 215 and the second sliding chamber 213 are connected by a spring, and the spring has a reset function.

[0060] After the heat sealing is completed, the heat sealing head 201 needs to be separated from the packaging bag in time, otherwise the packaging will be over-heat-sealed, thereby affecting the sealing performance. The following provides a structure that allows the heat sealing head 201 to be separated from the heat-sealed packaging in time: Specifically, refer to Figure 5 , a pressure sensor is connected to the inner wall of the extrusion oil chamber 212, and the pressure sensor is used to accurately detect the changing state of the hydraulic oil. Since the thickness of the packaging bag will gradually become thinner during heat sealing, the pressure in the extrusion oil chamber 212 will decrease at this time, and the pressure sensor can detect it. The pressure sensor is a device that can sense external pressure changes and convert them into electrical signals. This is an existing device and will not be described in detail here. The interior of the clamping frame 103 is provided with a storage chamber 302 that is coaxial with the side hydraulic cylinder. The sleeve 202 is located in the storage chamber 302, and the side hydraulic cylinder can be received in the storage chamber 302. A fourth sliding chamber 303 is provided on the side wall of the storage chamber 302, and a positioning block 304 is slidably connected to the fourth sliding chamber 303. The positioning block 304 and the fourth sliding chamber 303 are connected by a spring. Specifically, the spring is in tension The locking cam 304 is pressed against the locking cam 306 to lock the locking cam 307. The locking cam 306 is pressed against the locking cam 307 to lock the locking cam 307. The locking cam 306 is pressed against the locking cam 307 to lock the locking cam 307.

[0061] Specifically, after the side hydraulic cylinder is pulled into the receiving chamber 302, it needs to be reset to facilitate the next heat sealing action. The following provides a structure for resetting the sleeve 202 and resetting the connecting block 209: Figure 5A reset bracket 306 is connected to the second accommodating chamber 109. The reset bracket 306 is divided into two sections, which support the fixed block 210 from both sides. A reset rod 307 is connected to the top of the connecting block 209. A protrusion 301 that cooperates with the reset rod 307 is connected to the reset bracket 306. When the side hydraulic cylinder is pulled into the storage chamber 302, the side hydraulic cylinder will drive the fixed block 210 to move together. At this time, the reset rod 307 on the connecting block 209 will come into contact with the protrusion 301, thereby being pressed into the first sliding chamber 208, driving the connecting block 209 to move to the bottom of the first sliding chamber 208, and the driven block 216 extends out to fix it, thereby completing the reset. At the same time, the fixing block 210 will also come into contact with the reset bracket 306. As the side hydraulic cylinder continues to shorten, the sleeve 202 located in the storage chamber 302 will be pulled outward. When it moves to the position of the fourth sliding chamber 303, the positioning block 304 extends from the fourth sliding chamber 303 under the action of the spring and is inserted into the groove, thereby fixing the sleeve 202 and completing the reset action.

[0062] When the exhaust pipe 105 is pulled out upward, wrinkles may appear at the position where the bag mouth is pulled out. The following provides a structure for flattening the bag: Specifically, refer to Figure 8 The shaping component includes a central column 501 and an anti-slip cover 502 mounted on the central column 501. One end of the central column 501 is fixed to the roller frame 112, and the anti-slip cover 502 is rotatably connected to the central column 501. One end of the central column 501 is fixed to the roller frame 112, and one end of the anti-slip cover 502 is rotatably connected to the roller frame 112. The anti-slip cover 502 is driven to rotate by an external driving device. An air suction groove 503 is opened inside the central column 501. Specifically, the air suction groove 503 is located at the position of the central column 501 facing the packaging bag. Only the position in contact with the packaging bag has suction, thereby improving the connection ability between the anti-slip sleeve 502 and the packaging bag. One end of the central column 501 is connected to a negative pressure device, and the suction groove 503 is connected to the negative pressure device. The anti-slip sleeve 502 is provided with air inlet holes that match the suction groove 503 at equal intervals. Specifically, the packaging bag is adsorbed by the negative pressure. Since the anti-slip sleeve 502 is in a rotating state, that is, it rotates upward, the packaging bag can be flattened upward to facilitate heat sealing by the heat-sealing roller 401 below, thereby improving the connection ability with the packaging bag through the negative pressure device.

[0063] The sealing assembly includes a heat sealing roller 401 and a distance measuring cylinder 402 connected to both ends of the heat sealing roller 401. The heat sealing roller 401 is a roller-shaped heating device used for heat sealing the package, and is also called a roller heat sealer or roller heat sealer. This type of equipment is designed to use one or more heated rollers or rollers. When the material passes between these heated rollers or rollers, a continuous heat sealing operation can be achieved. The roller heat sealer is particularly suitable for sealing flexible materials such as plastic films, aluminum foils, etc., and is widely used in the fields of food packaging, pharmaceutical product packaging, etc. This is an existing device and will not be described in detail here. The distance measuring cylinder 402 is rotatably connected to the roller frame 112. The distance measuring cylinder 402 comes into contact with the pressed position on the packaging bag, contacts the packaging bag through friction, and synchronously drives the heat sealing roller 401 to rotate to avoid slipping during heat sealing.

[0064] Specifically, the sealing strip 107 is in the shape of a U.S. character. When the vacuum is completed and the vacuum tube 105 is moved upward and pulled out, the sealing part at the bottom will fail. At this time, the sealing strip 107 at the top plays a sealing role. After the oil cylinder 111 is extended to push the roller frame 112 to press on the packaging bag, the middle position of the packaging bag will be heat-sealed. The roller frame 112 moves upward together with the vacuum tube 105. When the vacuum tube 105 is about to be completely pulled out, the heat-sealing roller 401 below also completes the heat-sealing action, thereby avoiding gas backflow when the vacuum tube 105 is pulled out.

[0065] It should be noted that the length of the heat-sealing roller 401 should be greater than the length of the middle portion to be heat-sealed, so as to avoid misalignment between the second heat-sealing area and the first heat-sealing area during heat sealing.

[0066] Since the heat sealing roller 401 and the anti-slip sleeve 502 need to rotate in opposite directions to be able to move, the following structure is provided to enable them to move: Figure 9 The roller frame 112 is connected to a motor 504, which is preferably a reduction motor 504. The output end of the motor 504 is connected to a driving gear 505, and one end of the ranging tube 402 is connected to a driven gear 506 that meshes with the driving gear 505. The motor 504 drives the driven gear 506 to rotate in the opposite direction through the driving gear 505. The driving gear 505 and the anti-slip sleeve 502 are connected by a chain transmission structure 507, and the driving gear 505 drives the anti-slip sleeve 502 to rotate through the chain transmission structure 507.

[0067] After the packaging bag is fixed on the clamping frame 103, the bag mouth of the packaging bag needs to be opened so that the exhaust pipe 105 can be inserted. The following provides a structure that can open the bag mouth: Figure 10A suction cup frame 608 is symmetrically connected to the opposite side of the fixed plate 603, and a fourth cylinder 609 is connected between the suction cup frame 608 and the fixed plate 603. The fourth cylinder 609 can push the suction cup frame 608 to extend outward, so that the suction cup frame 608 comes into contact with the packaging bag. The suction cup is connected to a negative pressure device, which sucks the packaging bag through negative pressure, so that the bag opening opens to both sides.

[0068] Before heat sealing the packaging bag, the bag opening needs to be flattened to improve the heat sealing effect. The following provides a structure for flattening the bag opening: Specifically, refer to Figure 10 and Figure 11 The top of the fixed cover 101 is connected to the first cylinder 601, the exhaust pipe 105 is connected to the output end of the first cylinder 601, the first cylinder 601 pushes the exhaust pipe 105 to move up and down, the movable cover 102 and the fixed cover 101 are both connected to the second cylinder 602, the sealing frame 104 is connected to the output end of the second cylinder 602, when the second cylinder 602 is extended, the symmetrical sealing frame 104 will be clamped on both sides of the packaging bag opening, the clamping frame 103 includes a fixed plate 603, a movable plate 604 located on both sides of the fixed plate 603, and a movable plate 604. The movable plate 604 is slidably connected to the fixed plate 603 and can be extended from both sides. The top of the movable plate 604 is rotatably connected to a clamping claw 605, which is used to fix the package from both sides. The side of the fixed plate 603 away from the air extraction pipe 105 is connected to a third cylinder 606. A connecting rod 607 is connected between the output end of the third cylinder 606 and the movable plate 604. When the third cylinder 606 is actuated, the connecting rod 607 pushes the movable plate 604 to both sides, so that the movable plate 604 drives the packaging bag to be pulled to both sides, flattening it and avoiding wrinkles.

[0069] The clamping jaw 605 needs to rotate to fix the packaging bag. The following provides a structure for driving the clamping jaw 605 to rotate: Specifically, refer to Figure 10 The interior of the movable plate 604 is connected to a fifth cylinder 613, and the interior of the clamping jaw 605 is fixedly connected to a rotating tube 610. The rotating tube 610 is rotatably connected to the movable plate 604. When the rotating tube 610 rotates, the clamping jaw 605 is driven to rotate. An oblique sliding groove 611 is provided inside the rotating tube 610. The protruding end of the fifth cylinder 613 is connected to a slider located in the oblique sliding groove 611. When the fifth cylinder 613 is extended upward, the slider slides in the oblique sliding groove 611, thereby driving the clamping jaw 605 to rotate.

[0070] The movable cover 102 needs to be able to open upward to facilitate loading and unloading. The following provides a structure for driving the movable cover 102 to open and close: the top of the movable cover 102 is connected to an opening and closing frame 612, and the movable cover 102 and the opening and closing frame 612 are hinged to adapt to the state when the fixed cover 101 is closed. The opening and closing frame 612 and the fixed cover 101 are hinged, and a sixth cylinder 614 is connected between one end of the opening and closing frame 612 and the movable cover 102. When the sixth cylinder 614 extends upward, the movable cover 102 can be covered on the fixed cover 101 through the principle of leverage.

[0071] A vacuum extraction method for a food packaging bag comprises the following steps:

[0072] S1. Loading: A food bag is placed on the clamping frame 103 via an external loading device. The clamping claws 605 on both sides of the upper portion of the clamping frame 103 rotate to clamp the bag. At this time, the sixth cylinder 614 is actuated, driving the movable cover 102 downward via the opening and closing frame 612 and covering the fixed cover 101. The symmetrical clamping frames 103 clamp both sides of the bag.

[0073] S2. Flattening: The suction cup frame 608 on the fixed plate 603 generates negative pressure, and the fourth cylinder 609 drives the suction cup frame 608 to extend and retract, opening the packaging bag. The first cylinder 601 drives the suction pipe 105 to insert into the packaging bag. Then, the movable plate 604 moves to both sides to flatten the packaging bag so that the packaging bag opening can be fixed;

[0074] S3. Vacuuming: The sealing frames 104 on both sides extend to clamp the bag opening. The heat sealing heads 201 in the sealing frames 104 extend first to heat-seal both ends of the bag opening. After heat sealing, the heat sealing heads retract. The external negative pressure device is activated to extract the gas in the packaging bag through the vacuum pipe 105.

[0075] S4. Sealing: The first cylinder 601 drives the vacuum tube 105 to retract upward. At this time, the roller frame 112 drives the shaping assembly and the sealing assembly to press on the packaging bag. The shaping assembly on the roller frame 112 rotates in the opposite direction to scrape the packaging bag upward to keep it flat. The sealing assembly seals the bag opening.

[0076] S5, unloading: After the sealing is completed, the movable cover 102 opens upward, and the clamping jaws 605 rotate in the opposite direction. At this time, the clamping jaws 605 lose their ability to fix the packaging bag, and the packaging bag falls onto the conveying device below.

[0077] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A vacuum sealing device for food packaging bags, comprising a rotating table body (100) and clamping components arranged in an array at equal intervals on the rotating table, characterized in that: The clamping assembly includes a fixed cover (101) and a movable cover (102) that cooperate with each other. The fixed cover (101) and the movable cover (102) are connected to a clamping frame (103) and a sealing frame (104) located above the clamping frame (103) on opposite sides. An elliptical air extraction pipe (105) is provided in the fixed cover (101). The air extraction pipe (105) is externally connected to a negative pressure device. A receiving groove (106) that cooperates with the air extraction pipe (105) is symmetrically provided on the sealing frame (104). A first accommodating cavity (108) is provided inside the sealing frame (104), and second accommodating cavities (109) communicating with the first accommodating cavity (108) are provided at both ends of the first accommodating cavity (108), and a side heat sealing assembly is slidably connected inside the second accommodating cavity (109); The interior of the first accommodating chamber (108) is connected to a lifting hydraulic rod (110), the output end of the lifting hydraulic rod (110) is connected to an extension cylinder (111), the output end of the extension cylinder (111) is connected to a roller frame (112), the roller frame (112) is connected to a sealing component and a shaping component located above the sealing component, and the sealing component and the shaping component are externally connected to a rotation drive device; The side heat sealing assembly comprises a heat sealing head (201) and a side hydraulic cylinder, wherein the axial direction of the side hydraulic cylinder is parallel to the second accommodating chamber (109), and the side hydraulic cylinder comprises a sleeve (202) and an extension rod (203) sleeved in the sleeve (202), wherein one end of the extension rod (203) away from the sleeve (202) is connected to the heat sealing head (201), and a two-way oil circuit is provided inside the extension rod (203), and the two-way oil circuit controls the extension and retraction of the extension rod (203) in the sleeve (202).

2. The vacuum sealing device for a food packaging bag according to claim 1, characterized in that: One end of the extending rod (203) is connected to a fixed platform (207) located on the heat sealing pressure head (201), the two-way oil circuit passes through the inside of the fixed platform (207), a first sliding cavity (208) is provided inside the fixed platform (207), a connecting block (209) is connected to the first sliding cavity (208) for sliding up and down, a through hole is provided inside the connecting block (209) for matching with the two-way oil circuit, and a lifting drive device is externally connected to the top of the connecting block (209).

3. The vacuum sealing device for a food packaging bag according to claim 2, characterized in that: One end of the extending rod (203) close to the heat sealing head (201) is connected to a fixed block (210), the interior of the fixed block (210) is slidably connected to a moving block (211), a side of the moving block (211) away from the fixed block (210) is connected to the heat sealing head (201), an extrusion oil chamber (212) is provided between the fixed block (210) and the moving block (211), and the extrusion oil chamber (212) is filled with hydraulic oil; An active block (215) and a driven block (216) are slidably connected in the connecting block (209). The moving direction of the active block (215) is the same as that of the connecting block (209). The moving direction of the driven block (216) is perpendicular to that of the active block (215). An obliquely arranged sliding groove (217) is provided on the active block (215). A pin located in the sliding groove (217) is connected to the driven block (216). An inclined portion (218) is provided at one end of the driven block (216) close to the connecting block (209). A groove for accommodating the inclined portion (218) is provided on the connecting block (209). The active block (215) drives the driven block (216) to be inserted into the groove on the connecting block (209).

4. The vacuum sealing device for a food packaging bag according to claim 3, characterized in that: A second sliding chamber (213) is provided inside the connecting block (209), the active block (215) is slidably connected to the second sliding chamber (213), the bottom of the second sliding chamber (213) is slidably connected to a second piston plate (219), the second piston plate (219) and the extrusion oil chamber (212) are connected via a spring, the bottom of the active block (215) is connected to an extension rod (220) in contact with the second piston plate (219), and the top of the active block (215) and the second sliding chamber (213) are connected via a spring.

5. The vacuum sealing device for a food packaging bag according to claim 4, characterized in that: A pressure sensor is connected to the inner wall of the extrusion oil chamber (212); a receiving chamber (302) is provided in the second accommodating chamber (109); the sleeve (202) is located in the receiving chamber (302); a fourth sliding chamber (303) is provided on the side wall of the receiving chamber (302); a positioning block (304) is slidably connected in the fourth sliding chamber (303); a groove matching the positioning block (304) is provided on the sleeve (202); an electromagnet (305) is connected to the inner wall of the fourth sliding chamber (303); the electromagnet (305) pushes the positioning block (304) to be inserted into the groove of the sleeve (202); and the electromagnet (305) is electrically connected to the pressure sensor.

6. The vacuum sealing device for a food packaging bag according to claim 5, characterized in that: The shaping component includes a central column (501) and an anti-slip sleeve (502) sleeved on the central column (501), one end of the central column (501) is fixedly connected to the roller frame (112), one end of the anti-slip sleeve (502) is rotatably connected to the roller frame (112), an air suction groove (503) is provided inside the central column (501), one end of the central column (501) is externally connected to a negative pressure device, the air suction groove (503) is connected to the negative pressure device, air inlet holes matching the air suction groove (503) are provided on the anti-slip sleeve (502) at equal intervals, and one end of the anti-slip sleeve (502) is externally connected to a rotation drive structure.

7. The vacuum sealing device for a food packaging bag according to claim 6, characterized in that: The sealing assembly comprises a heat-sealing roller (401) and a distance-measuring cylinder (402) connected to both ends of the heat-sealing roller (401), wherein the distance-measuring cylinder (402) is rotatably connected to the roller frame (112); The roller frame (112) is connected to a motor (504), the output end of the motor (504) is connected to a driving gear (505), one end of the distance measuring tube (402) is connected to a driven gear (506) meshing with the driving gear (505), and the driving gear (505) and the anti-slip sleeve (502) are connected via a chain transmission structure (507).

8. The vacuum sealing device for a food packaging bag according to claim 7, characterized in that: The top of the fixed cover (101) is connected to a first cylinder (601), the exhaust pipe (105) is connected to the output end of the first cylinder (601), the inside of the movable cover (102) and the fixed cover (101) are both connected to a second cylinder (602), the sealing frame (104) is connected to the output end of the second cylinder (602), the clamping frame (103) includes a fixed plate (603), and movable plates (604) located on both sides of the fixed plate (603), the top of the movable plate (604) is rotatably connected to a clamping claw (605), the side of the fixed plate (603) away from the exhaust pipe (105) is connected to a third cylinder (606), and a connecting rod (607) is connected between the output end of the third cylinder (606) and the movable plate (604); A suction cup frame (608) is connected to the opposite side of the fixed plate (603), a fourth cylinder (609) is connected between the suction cup frame (608) and the fixed plate (603), and the suction cup on the suction cup frame (608) is externally connected to a negative pressure device.

9. The vacuum sealing device for a food packaging bag according to claim 8, characterized in that: The interior of the movable plate (604) is connected to a fifth cylinder (613), the interior of the clamping jaw (605) is fixedly connected to a rotating tube (610), an oblique sliding groove (611) is provided inside the rotating tube (610), and the protruding end of the fifth cylinder (613) is connected to a slider located in the oblique sliding groove (611).

10. A method for vacuum extraction of a food packaging bag, using the vacuum sealing device for a food packaging bag according to claim 9, characterized in that: The following steps are involved: S1. Loading: The loading device places the packaging bag on the clamping frame (103), the clamping claw (605) rotates to clamp the packaging bag, the movable cover (102) turns downward, and the symmetrical clamping frame (103) clamps the packaging bag; S2. Flattening: The suction cup frame (608) generates negative pressure, and the fourth cylinder (609) drives it to extend and retract, opening the packaging bag. The air extraction tube (105) is inserted into the packaging bag, and then the movable plate (604) extends to both sides to flatten the packaging bag; S3, exhaust: The sealing frames (104) on both sides extend to clamp the bag opening, the heat sealing head (201) in the sealing frame (104) extends first to heat-seal both ends of the bag opening, and the external negative pressure device exhausts the gas in the packaging bag through the exhaust pipe (105); S4, sealing: the first cylinder (601) drives the vacuum tube (105) to retract upward, at which time the roller frame (112) drives the shaping component and the sealing component to press on the packaging bag, and moves upward synchronously with the vacuum tube (105), the shaping component on the roller frame (112) rotates to shape the packaging bag, and the sealing component seals the bag opening; S5, unloading: After the sealing is completed, the movable cover (102) opens upward, the clamping claw (605) rotates in the opposite direction, and loses the ability to fix the packaging bag. At this time, the packaging bag falls onto the conveyor belt below.

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