Vacuum sealing device and method for food packaging bag

Abstract

The invention discloses a vacuum sealing device and method for food packaging bags, and relates to the technical field of vacuum sealing devices.The vacuum sealing device comprises a rotating table body and clamping assemblies arrayed on the rotating table at equal intervals, and each clamping assembly comprises a fixed cover and a movable cover which are matched with each other; the opposite faces in the fixed cover and the movable cover are connected with clamping frames and sealing frames located above the clamping frames, an oval exhaust pipe is arranged in the fixed cover, and the exhaust pipe is externally connected with a negative pressure device. According to the vacuum sealing device and method for the food packaging bag, through two times of heat sealing, the vacuum extraction area can be reduced, the situation that due to the fact that an opening is too large, vacuum leakage occurs is avoided, meanwhile, no matter how thick the packaging bag is, when pressure reaches, an oil way can be cut off, so that the heat sealing state of the packaging bag is kept, and the sealing effect of the packaging bag is improved. And the pressure constancy during heat sealing is improved.

Description

Technical Field

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

[0002] The vacuum sealing device for food packaging bags, also known as a vacuum packaging machine or a vacuum sealer, is a device used to remove the air inside the packaging bag. This device is mainly used to extend the shelf life of food, reduce oxidation reactions, and prevent food from being contaminated and affected by moisture. By pumping out the air inside the packaging bag to form a near-vacuum state, the freshness and flavor of the food can be effectively protected.

[0003] Chinese Patent with Application No. 202310124491.X discloses a vacuum sealer for food processing. The structure includes a box body. An inclined plate is fixedly installed on the upper surface of the box body. Side plates are symmetrically and fixedly installed at both ends of the inclined plate. A stop block is fixedly installed on one side of the side plate, and a support plate is fixedly installed on the other side of the side plate. Both the stop block and the support plate are fixedly installed on the upper surface of the box body. A guide groove is provided on one side of the upper surface of the side plate. A cross beam is fixedly installed above the guide groove. A screw hole block is fixedly installed in the middle of the upper surface of the cross beam. A telescopic rod is fixedly installed in the middle of the lower surface of the cross beam. The bottom end of the telescopic rod is fixedly installed with a heat sealing plate that is slidably sleeved in the guide groove. A nozzle mechanism is slidably sleeved in the middle of the support plate. This device has the function of improving the sealing performance.

[0004] Chinese Patent with Application No. 202011340402.8 discloses a vacuum sealing and packaging machine. The structure includes an upper cover, a lower base, a rotating shaft, and a controller; a vacuum pump is provided at one end of the lower base; a second heating strip is provided at the other end of the lower base; a first clamping block, a first spring, and a second clamping block are placed inside the T-shaped chute; a first groove is provided on the lower base; both ends of the first groove are connected to mounting plates; one end of the mounting plate is connected to an elastic sealing belt; the other end of the elastic sealing belt is connected to a slider. This device has the function of limiting the packaging bag to prevent it from running off track.

[0005] The current vacuum packaging devices still have the following problems: 1. When performing heat sealing for vacuum packaging, different thicknesses of packaging bags require different pressing amounts of the heat sealing press head. Since the packaging bags are relatively thin, it is not convenient for manual precise adjustment of the pressing depth, which will affect the heat sealing effect and further affect the packaging sealing performance.

[0006] 2. When removing the air extraction pipe from the bag mouth after vacuum pumping, there will be a situation where air flows back into the bag through the gap, which will affect the vacuum degree inside the bag. At the same time, when the air extraction pipe is pulled out, there will be a problem of bag mouth wrinkles, which will affect the sealing effect.

[0007] 3. When the air extraction pipe is inserted into the packaging bag, wrinkles will appear at the position of the bag mouth, affecting the flatness of the bag mouth and reducing the subsequent vacuum pumping and sealing effects.

[0008] 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

[0009] 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.

[0010] The technical solution it adopts is that the present invention includes a rotating table main body and clamping components arranged in an equidistant array on the rotating table. The clamping components include a fixed cover and a movable cover that cooperate with each other. Opposite sides of the fixed cover and the movable cover are both connected with clamping frames and sealing frames located above the clamping frames. An oval air extraction pipe is arranged inside the fixed cover. The air extraction pipe is externally connected to a negative pressure device. Accommodation grooves matching the air extraction pipe are opened on the symmetric sealing frames. A first accommodation cavity is opened inside the sealing frame. Second accommodation cavities communicating with the first accommodation cavity are opened at both ends of the first accommodation cavity. Side heat sealing components are slidably connected inside the second accommodation cavities. A lifting hydraulic rod is connected inside the first accommodation cavity. The output end of the lifting hydraulic rod is connected with a telescopic oil cylinder. The output end of the telescopic oil cylinder is connected with a roller frame. A sealing component and a shaping component located above the sealing component are connected to the roller frame. The sealing component and the shaping component are externally connected to a rotation driving device.

[0011] Further, the side heat sealing component includes a heat sealing press head and a side hydraulic cylinder. The axis direction of the side hydraulic cylinder is parallel to the second accommodation cavity. The side hydraulic cylinder includes a sleeve and a telescopic rod sleeved inside the sleeve. One end of the telescopic rod away from the sleeve is connected with the heat sealing press head. A two-way oil circuit is opened inside the telescopic rod. The two-way oil circuit controls the extension and retraction of the telescopic rod inside the sleeve. One end of the telescopic rod is connected with a fixed platform located on the heat sealing press head. The two-way oil circuit passes through the inside of the fixed platform. A first sliding cavity is opened inside the fixed platform. A communicating block is slidably connected up and down inside the first sliding cavity. A through hole matching the two-way oil circuit is opened inside the communicating block. The top of the communicating block is externally connected to a lifting driving device.

[0012] Further, one end of the telescopic rod close to the heat sealing press head is connected with a fixed block. A moving block is slidably connected inside the fixed block. One side of the moving block away from the fixed block is connected with the heat sealing press head. An extrusion oil cavity is arranged between the fixed block and the moving block. The extrusion oil cavity is filled with hydraulic oil. A driving block and a driven block are slidably connected within the connection block. The moving direction of the driving block is the same as that of the connection block, and the moving direction of the driven block is perpendicular to that of the driving block. An obliquely arranged sliding groove is formed in the driving block, and a pin shaft located within the sliding groove is connected to the driven block. An inclined surface portion is provided at one end of the driven block close to the connection block, and a groove for accommodating the inclined surface portion is formed in the connection block. The driving block drives the driven block to insert into the groove on the connection block.

[0013] Further, a second sliding cavity is formed inside the connection block. The driving block is slidably connected within the second sliding cavity. A second piston plate is slidably connected to the bottom of the second sliding cavity. The second piston plate and the extrusion oil cavity are connected by a spring. A lengthening rod in contact with the second piston plate is connected to the bottom of the driving block. The top of the driving block and the second sliding cavity are connected by a spring.

[0014] Further, a pressure sensor is connected to the inner wall of the extrusion oil cavity. A storage cavity is formed in the second accommodation cavity. The sleeve is located within the storage cavity. A fourth sliding cavity is formed in the side wall of the storage cavity. A positioning latch is slidably connected within the fourth sliding cavity. A groove cooperating with the positioning latch is formed in the sleeve. An electromagnet is connected to the inner wall of the fourth sliding cavity. The electromagnet pushes the positioning latch to insert into the groove of the sleeve. The electromagnet and the pressure sensor are electrically connected.

[0015] Further, the shaping assembly includes a central column and an anti-slip sleeve sleeved 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 formed inside the central column. One end of the central column is externally connected to a negative pressure device. The air suction groove is communicated with the negative pressure device. Air inlet holes cooperating with the air suction groove are equidistantly formed on the anti-slip sleeve. One end of the anti-slip sleeve is externally connected to a rotary drive structure.

[0016] Further, the sealing assembly includes a heat-sealing roller and distance-measuring cylinders connected to both ends of the heat-sealing roller. The distance-measuring cylinders are rotatably connected to the roller frame; A motor is connected to the roller frame. The output end of the motor is connected to a driving gear. A driven gear meshing with the driving gear is connected to one end of the distance-measuring cylinder. The driving gear and the anti-slip sleeve are connected by a chain drive structure.

[0017] Further, a first cylinder is connected to the top inside the fixed cover, the air extraction pipe is connected to the output end of the first cylinder, second cylinders are connected to the inside of both the movable cover and the fixed cover, the sealing frame is connected to the output ends of the second cylinders, the clamping frame includes a fixed plate and movable plates located on both sides of the fixed plate, a clamping jaw is rotatably connected to the top of the movable plate, a third cylinder is connected to the side of the fixed plate away from the air extraction pipe, and a connecting rod is connected between the output end of the third cylinder and the movable plate; Suction cup frames are connected to the opposite sides of the fixed plate facing each other, a fourth cylinder is connected between the suction cup frames and the fixed plate, and the suction cups on the suction cup frames are externally connected to a negative pressure device.

[0018] Further, a fifth cylinder is connected to the inside of the movable plate, a rotating tube is fixedly connected to the inside of the clamping jaw, an inclined chute is formed inside the rotating tube, and the extending end of the fifth cylinder is connected to a slider located inside the inclined chute.

[0019] A method for vacuum extraction of food packaging bags includes the following steps: S1. Feeding: The feeding device places the packaging bag on the clamping frame, the clamping jaws rotate to clamp the packaging bag, the movable cover flips downward, and the symmetrical clamping frames clamp the packaging bag; S2. Flattening: The suction cup frames generate negative pressure, the fourth cylinder drives it to extend and retract, opens the bag mouth of the packaging bag, inserts the air extraction pipe into the packaging bag, and then the movable plates extend to both sides to flatten the packaging bag; S3. Air extraction: The sealing frames on both sides extend to clamp the bag mouth position, the heat-sealing pressing heads inside the sealing frames first extend to perform heat sealing on both ends of the bag mouth position, and the external negative pressure device extracts the gas inside the packaging bag through the air extraction pipe; S4. Sealing: The first cylinder drives the air extraction pipe 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 air extraction pipe. The shaping component on the roller frame rotates to shape the packaging bag, and the sealing component seals the bag mouth position; S5. Discharging: After sealing, the movable cover opens upward, the clamping jaws rotate in the reverse direction and lose the ability to fix the packaging bag. At this time, the packaging bag falls onto the conveyor belt below.

[0020] Adopting the technical solution provided by the present invention, compared with the existing well-known technologies, it has the following remarkable effects: 1. The device is provided with a first accommodation cavity and a second accommodation cavity in the clamping frame. The first accommodation cavity and the second accommodation cavity have an overlapping area. Through two times of heat sealing, the vacuum extraction area can be reduced, avoiding the situation of vacuum leakage due to too large an opening, so as to improve the sealing performance after heat sealing.

[0021] 2. An extrusion oil cavity is provided on the heat-sealing press head of this device. When the extrusion oil cavity is extruded, it can drive the active block to move upward, thereby causing the connection block to move upward and cut off the oil supply pipeline, so that the heat-sealing press head no longer continues to move. It has the function of fixed-pressure fixation. Regardless of the thickness of the packaging bag, when the pressure reaches, the oil circuit can be cut off to maintain the heat-sealing state of the packaging bag, improving the pressure constancy during heat-sealing.

[0022] 3. With the coordinated setting of the pressure sensor and the electromagnet in this device, when the thickness of the packaging bag becomes thinner, the reduced pressure can drive the electromagnet to act, causing the side hydraulic cylinder to retract into the storage cavity, and it can be separated from the packaging bag in time after heat-sealing, avoiding the situation of overheat-sealing, and having the effect of improving the heat-sealing effect.

[0023] 4. Through the coordinated setting of the heat-sealing roller and the ranging cylinder in this device, it can rise synchronously with the extraction pipe, having the function of heat-sealing the packaging bag while pulling out the extraction pipe, avoiding the situation of air backflow when the extraction pipe is pulled out, and having the effect of improving the sealing performance.

[0024] 5. A shaping component is provided above the heat-sealing roller of this device, which can flatten the opening of the packaging bag when the extraction pipe is pulled out, improving the subsequent heat-sealing effect and the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the rotating table main body and the fixed cover structure in the present invention; Figure 2 It is a schematic diagram of the fixed cover and the movable cover structure in the present invention; Figure 3 It is a schematic diagram of the first accommodation cavity and the second accommodation cavity structure in the present invention; Figure 4 It is a schematic diagram of the reset bracket and the protrusion structure in the present invention; Figure 5 It is a schematic diagram of the sleeve and the protruding rod structure in the present invention; Figure 6 It is a schematic diagram of the fixed table and the connection block structure in the present invention; Figure 7 It is a schematic diagram of the heat-sealing roller and the anti-slip sleeve structure in the present invention; Figure 8 It is a schematic diagram of the central column and the anti-slip sleeve structure in the present invention; Figure 9 It is a schematic diagram of the heat-sealing roller and the ranging cylinder structure in the present invention; Figure 10 It is a schematic diagram of the movable cover and the opening and closing frame structure in the present invention; Figure 11 It is a schematic diagram of the fixed plate and the movable plate structure in the present invention.

[0026] Reference numerals: 100, rotary table body; 101, fixed cover; 102, movable cover; 103, clamping bracket; 104, sealing bracket; 105, exhaust pipe; 106, receiving groove; 107, sealing strip; 108, first receiving cavity; 109, second receiving cavity; 110, lifting hydraulic rod; 111, extending oil cylinder; 112, roller bracket; 201, heat-sealing press head; 202, sleeve; 203, extending rod; 204, first oil pipeline; 205, second oil pipeline; 206, first piston plate; 207, fixed table; 208, first sliding cavity; 209, connecting block; 210, fixed block; 211, moving block; 212, extrusion oil cavity; 213, second sliding cavity; 214, third sliding cavity; 215, active block; 216, driven block; 217, sliding groove; 218, inclined surface part; 219, second piston plate; 220, extension rod; 301, convex part; 302, storage cavity; 303, fourth sliding cavity; 304, positioning block; 305, electromagnet; 306, reset bracket; 307, reset rod; 401, heat-sealing roller; 402, ranging cylinder; 501, central column; 502, anti-slip sleeve; 503, suction groove; 504, motor; 505, driving gear; 506, driven gear; 507, chain drive structure; 601, first cylinder; 602, second cylinder; 603, fixing plate; 604, movable plate; 605, jaw; 606, third cylinder; 607, connecting rod; 608, suction cup bracket; 609, fourth cylinder; 610, rotating pipe; 611, inclined chute; 612, opening and closing bracket; 613, fifth cylinder; 614, sixth cylinder. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be 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 used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0028] By Figures 1 to 11Given, including a rotary table main body 100 and clamping components arranged in an equidistant array on the rotary table. The rotary table main body 100 is a rotary device in the form of a turntable, with a rotary drive device installed inside. Through rotation, it can drive the processing stations above to rotate, so as to carry out continuous work at different stations, and is widely used in automated equipment. This is an existing device and will not be elaborated too much here. The clamping component includes a fixed cover 101 and a movable cover 102 that cooperate with each other. Opposite sides inside the fixed cover 101 and the movable cover 102 are both connected with a clamping frame 103 and a sealing frame 104 located above the clamping frame 103. When the movable cover 102 covers the fixed cover 101, the internal clamping frame 103 and the sealing frame 104 can be kept symmetrical and located on both sides of the packaging bag. An oval air extraction pipe 105 is arranged inside the fixed cover 101. Compared with a circular air extraction pipe 105, the oval air extraction pipe 105 can avoid excessive deformation of the packaging bag when the sealing frame 104 clamps the packaging bag, that is, the parts of the packaging bag at the three intersection positions of the air extraction pipe 105 and the symmetrical sealing frame 104. The air extraction pipe 105 is externally connected to a negative pressure device, and the air inside the packaging bag is pumped out through the negative pressure device. A receiving groove 106 matching the air extraction pipe 105 is opened on the symmetrical sealing frame 104. A sealing strip 107 is connected to the sealing frame 104. Refer to Figure 3, and the sealing strip 107 is in the shape of a long opening; When performing vacuum air extraction on the packaging bag, due to the too large bag opening, air leakage is likely to occur on both sides or locally of the bag opening during air extraction. The following provides a structure for reducing the air extraction area: Refer to Figure 3 and Figure 4 , a first receiving cavity 108 is opened inside the sealing frame 104, and second receiving cavities 109 are located at both ends of the first receiving cavity 108. The first receiving cavity 108 and the second receiving cavities 109 are on the same horizontal plane. The second receiving cavity 109 is in the shape of a parallelogram, and a corner facing the first receiving cavity 108 overlaps with the first receiving cavity 108. A side heat-sealing component is slidably connected inside the second receiving cavity 109. Refer to Figure 4 , when the side heat-sealing component extends out of the second receiving cavity 109, part of the structure will enter the area of the first receiving cavity 108. However, it should be noted that even when extending out, it is located on both sides of the air extraction pipe 105 and will not come into contact with the packaging at the air extraction pipe 105; Since the shape of the packaging bag opening is changed when the air extraction pipe 105 is inserted into the packaging bag, wrinkles will be caused at the extraction position when the air extraction pipe 105 is pulled out. The following provides a structure for shaping the extraction position to make it flat: Refer to Figure 3 and Figure 4, a lifting hydraulic rod 110 is connected inside the first accommodation cavity 108. The lifting hydraulic rod 110 moves up and down synchronously with the air extraction pipe 105. The output end of the lifting hydraulic rod 110 is connected to an extension oil cylinder 111. The output end of the extension oil cylinder 111 is connected to a roller frame 112. The extension oil cylinder 111 is used to press the roller frame 112 against the packaging bag. A sealing component and a shaping component located above the sealing component are connected to the roller frame 112. The sealing component and the shaping component are externally connected to a rotation driving device. Specifically, the shaping component rotates upward to flatten the packaging bag upward, and the sealing component rotates downward at the same speed as the upward movement of the roller frame 112, so that the position in contact with the packaging bag during heat sealing remains relatively stationary.

[0029] Since the second accommodation cavity 109 is in the shape of a parallelogram, a structure that can push the side heat sealing component to move parallelly is required to keep the side heat sealing component parallel to the packaging bag. Otherwise, the sealing may not be tight. The following provides a structure to keep it parallel: Specifically, referring to Figure 4 and Figure 5 , the side heat sealing component includes a heat sealing press head 201 and a side hydraulic cylinder. The heat sealing press 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, it is a heat sealing knife. The axis direction of the side hydraulic cylinder is parallel to the second accommodation cavity 109, so that when the heat sealing press head 201 extends, it can also be parallel to the packaging bag. The side hydraulic cylinder includes a sleeve 202 and a protruding rod 203 located inside the sleeve 202. One end of the sleeve 202 is connected to the second accommodation cavity 109. When the protruding rod 203 extends out of the sleeve 202, it can push the heat sealing press head 201 to press on the packaging bag. The end of the protruding rod 203 away from the sleeve 202 is connected to the heat sealing press head 201. A first oil pipeline 204 and a second oil pipeline 205 are provided inside the protruding rod 203. By switching the flow direction of the hydraulic oil inside the first oil pipeline 204 and the second oil pipeline 205, the extension and retraction of the side hydraulic cylinder can be controlled. One end of the protruding rod 203 located inside the sleeve 202 is connected to a first piston plate 206. One end of the first oil pipeline 204 is located on the outer wall of the protruding rod 203 near one end of the first piston plate 206, and one end of the second oil pipeline 205 is located at the end of the protruding rod 203 near the first piston plate 206. Referring to Figure 5 , when hydraulic oil is input into the first oil pipeline 204, the protruding rod 203 will retract into the sleeve 202. When hydraulic oil is input into the second oil pipeline 205, the protruding rod 203 will extend out of the sleeve 202; When the heat sealing press head 201 presses on the package, it needs to be maintained for a certain period of time to enable sufficient heat transfer and improve the sealing effect. The following provides a structure to keep the heat sealing press head 201 in the pressed state: Referring to Figure 6, one end of the heat-sealing press head 201 close to the extending rod 203 is connected with a fixed platform 207. One end of the fixed platform 207 is connected to the extending rod 203. The first oil pipeline 204 and the second oil pipeline 205 pass through the inside of the fixed platform 207. A first sliding cavity 208 is formed inside the fixed platform 207. A communicating block 209 is slidably connected up and down in the first sliding cavity 208. The communicating block 209 slides up and down in the first sliding cavity 208. Through holes matching the first oil pipeline 204 and the second oil pipeline 205 are formed inside the communicating block 209. Specifically, through holes are provided in the upper part of the communicating block 209 and not in the lower part. When the communicating 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 path and causing the side hydraulic cylinder not to extend further. The top of the communicating block 209 is externally connected to a lifting driving device. The first oil pipeline 204 and the second oil pipeline 205 are externally connected to an oil supply device. When the externally connected lifting driving device connected to the top of the communicating block 209 acts, it will drive the communicating block 209 to move upward, thereby cutting off the first oil pipeline 204 and the second oil pipeline 205 and keeping the side hydraulic cylinder in the extended state.

[0030] Since the thickness of each packaging bag is different, different pressure states are required, otherwise the state of the heat-sealing thickness of the packaging will be affected. The following provides a structure for automatically stopping the extension amount according to the pressure: Specifically, refer to Figure 5 and Figure 6 , a fixed block 210 and a moving block 211 are provided between the heat-sealing press head 201 and the extending rod 203. The fixed block 210 is connected to the extending rod 203. The moving block 211 is connected to the heat-sealing press head 201. The moving block 211 is slidably connected inside the fixed block 210. When the heat-sealing press head 201 presses on the packaging bag, the moving block 211 will be pressed into the fixed block 210. An extrusion oil cavity 212 is provided between the fixed block 210 and the moving block 211. The extrusion oil cavity 212 is filled with hydraulic oil. When the hydraulic oil is extruded, it will enter the second sliding cavity 213, thereby pushing the second piston plate 219 to move upward; The communicating block 209 needs to be driven by an externally connected lifting driving device to move its position, which requires back-and-forth control and is very troublesome. The following provides a structure that can automatically drive the communicating block 209 to act: Refer to Figure 6, a second sliding cavity 213 and a third sliding cavity 214 are formed inside the connecting block 209. The second sliding cavity 213 and the third sliding cavity 214 are vertically arranged. The bottom of the extrusion oil cavity 212 is communicated with the second sliding cavity 213, so that hydraulic oil can enter the second sliding cavity 213. An active block 215 is slidably connected up and down in the second sliding cavity 213, and a driven block 216 is slidably connected horizontally in the third sliding cavity 214. An obliquely arranged sliding groove 217 is formed on the active block 215, and a pin shaft located in the sliding groove 217 is connected to the driven block 216. Specifically, when the active block 215 moves upward, the driven block 216 will be pushed toward one end away from the connecting block 209 through the sliding of the driven block 216 in the sliding groove 217, so that the driven block 216 of the connecting block 209 is separated from the connecting block 209, losing the control effect on the connecting block 209. An inclined surface part 218 is arranged at one end of the driven block 216 close to the connecting block 209. When the connecting block 209 moves downward from the top, it will be pushed into the third sliding cavity 214 through the inclined surface part 218, and then the connecting block 209 moves to the bottom. A groove for accommodating the inclined surface part 218 is formed on the connecting block 209. 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 surface part 218 on one side of the driven block 216 is inserted into the groove on the connecting block 209, playing a limiting role on the connecting block 209; The active block 215 needs a driving structure to move it upward, and the control of the driving device is very cumbersome. The following provides a structure that can drive its movement according to the internal pressure of the extrusion oil cavity 212, and can also adapt to packages of different thicknesses: Refer to Figure 6 , a second piston plate 219 is slidably connected to the bottom of the second sliding cavity 213. When the extrusion oil cavity 212 is squeezed, the internal space will become smaller, and the hydraulic oil will enter the second sliding cavity 213, thereby pushing the second piston plate 219 to move upward. The second piston plate 219 and the extrusion oil cavity 212 are connected by a spring. When the internal hydraulic oil is not squeezed, the spring drives the second piston plate 219 to reset, pulling the hydraulic oil back into the extrusion oil cavity 212. A lengthened rod 220 in contact with the second piston plate 219 is connected to the bottom of the active block 215. Therefore, the lengthened rod 220 is arranged at the bottom of the active block 215. When the second piston plate 219 moves upward, it will push the active block 215 to move through the lengthened rod 220. The driven block 216 and the third sliding cavity 214 are connected by a spring. The top of the active block 215 and the second sliding cavity 213 are connected by a spring. The spring has a reset function.

[0031] After heat sealing is completed, the heat-sealing press head 201 needs to be separated from the packaging bag in a timely manner. Otherwise, overheat sealing of the package will occur, which will affect the sealing performance. The following provides a structure that enables the heat-sealing press head 201 to be separated from the heat-sealed package in a timely manner: Specifically, refer to Figure 5 , a pressure sensor is connected to the inner wall of the extrusion oil chamber 212. The pressure sensor is used to accurately detect the change state of the hydraulic oil. Since the thickness of the packaging bag gradually becomes 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 the change of external pressure and convert it into an electrical signal. This is an existing device and will not be elaborated here. A storage chamber 302 coaxial with the side hydraulic cylinder is opened inside the clamping frame 103. The sleeve 202 is located in the storage chamber 302, and the side hydraulic cylinder can be stored in the storage chamber 302. A fourth sliding chamber 303 is opened on the side wall of the storage chamber 302. A positioning block 304 is slidably connected in 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 a stretched state and is used to pull the sleeve 202 into the storage chamber 302. A groove matching the positioning block 304 is opened on the sleeve 202. When the positioning block 304 is inserted into the groove on the sleeve 202, it can be fixed on the storage chamber 302. An electromagnet 305 is connected to the inner wall of the fourth sliding chamber 303. A permanent magnet matching the electromagnet 305 is connected to the positioning block 304. When the electromagnet 305 is energized, the positioning block 304 is pulled back into the fourth sliding chamber 303 through the permanent magnet, so that the positioning block 304 loses its fixing effect on the sleeve 202. The electromagnet 305 is electrically connected to the pressure sensor. When the pressure in the extrusion oil chamber 212 decreases, the pressure sensor controls the electromagnet 305 to act, so that the side hydraulic cylinder is pulled into the storage chamber 302. At this time, the heat-sealing press head 201 will be separated from the packaging bag in a timely manner, avoiding overheat sealing; Specifically, after the side hydraulic cylinder is pulled into the storage chamber 302, it needs to be reset to facilitate the next heat-sealing operation. The following provides a structure for resetting the sleeve 202 and at the same time resetting the connecting block 209: Refer to Figure 5, a reset bracket 306 is connected inside the second accommodation cavity 109. The reset bracket 306 is arranged in two sections, respectively supporting the fixed block 210 from both sides. The top of the connecting block 209 is connected with a reset rod 307. A convex portion 301 matched with the reset rod 307 is connected on the reset bracket 306. When the side hydraulic cylinder is pulled into the accommodation cavity 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 convex portion 301, and thus be pressed into the first sliding cavity 208, driving the connecting block 209 to move to the bottom of the first sliding cavity 208, and the driven block 216 extends out and is fixed, thus completing the reset. At the same time, the fixed 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 accommodation cavity 302 will be pulled outwards. When it moves to the position of the fourth sliding cavity 303, the positioning block 304 extends out of the fourth sliding cavity 303 under the action of the spring and inserts into the groove, playing a role in fixing the sleeve 202 and completing the reset action.

[0032] When the air extraction pipe 105 is pulled out upwards, wrinkles will appear at the position where the packaging bag mouth is pulled out. The following provides a structure for flattening the packaging bag: Specifically, refer to Figure 8 , 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 fixed on the roller frame 112. The anti-slip sleeve 502 is rotatably connected to 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. The anti-slip sleeve 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, so that only the position in contact with the packaging bag has suction force, improving the connection ability between the anti-slip sleeve 502 and the packaging bag. One end of the central column 501 is externally connected to a negative pressure device. The air suction groove 503 is communicated with the negative pressure device. The anti-slip sleeve 502 is equidistantly provided with air inlet holes matched with the air suction groove 503. Specifically, the packaging bag is adsorbed by negative pressure. Since the anti-slip sleeve 502 is in a rotating state, that is, rotating upwards, the packaging bag can be flattened upwards, facilitating heat sealing by the following heat sealing roller 401, and improving the connection ability with the packaging bag through the negative pressure device.

[0033] The sealing component includes a heat-sealing roller 401 and distance-measuring cylinders 402 connected to both ends of the heat-sealing roller 401. The heat-sealing roller 401 is a drum-shaped heating device used for heat-sealing packages, also known as a drum-type heat-sealing machine or a roller heat-sealer. This device is designed with one or more heated drums or rollers, and continuous heat-sealing operations can be achieved when materials pass between these heated drums or rollers. The drum-type heat-sealing machine is particularly suitable for sealing flexible materials such as plastic films and aluminum foils, and is widely used in fields such as food packaging and pharmaceutical product packaging. This is an existing device and will not be elaborated here. The distance-measuring cylinder 402 is rotatably connected to the roller frame 112. The distance-measuring cylinder 402 comes into contact with the already laminated position on the packaging bag, makes contact with the packaging bag through friction, and synchronously drives the heat-sealing roller 401 to rotate, avoiding slippage during heat-sealing; Specifically, the sealing strip 107 is in a square shape. When the air extraction is completed and the air extraction pipe 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 extension oil cylinder 111 pushes the roller frame 112 to press on the packaging bag, heat-sealing will be performed on the middle position of the packaging bag. The roller frame 112 moves upward together with the air extraction pipe 105. When the air extraction pipe 105 is about to be completely pulled out, the heat-sealing roller 401 below has also completed the heat-sealing action, thus avoiding the situation of gas backflow when the air extraction pipe 105 is pulled out.

[0034] It should be noted that the length of the heat-sealing roller 401 should be greater than the length that needs to be heat-sealed in the middle to avoid misalignment between the second heat-sealing area and the first heat-sealing area during heat-sealing.

[0035] Since the heat-sealing roller 401 and the anti-slip sleeve 502 need to rotate in opposite directions to operate, the following provides a structure for making them operate: Refer to Figure 9 , a motor 504 is connected to the roller frame 112. The motor 504 is preferably a reduction motor 504. The output end of the motor 504 is connected to a driving gear 505. One end of the distance-measuring cylinder 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 reverse direction through the driving gear 505. A chain drive structure 507 is connected between the driving gear 505 and the anti-slip sleeve 502. The driving gear 505 drives the anti-slip sleeve 502 to rotate through the chain drive structure 507.

[0036] After the packaging bag is fixed on the clamping frame 103, the bag opening of the packaging bag needs to be opened so that the air extraction pipe 105 can be inserted. The following provides a structure for opening the bag opening: Refer to Figure 10, on the opposite sides of the fixed plate 603, a suction cup holder 608 is connected. A fourth cylinder 609 is connected between the suction cup holder 608 and the fixed plate 603. The fourth cylinder 609 can push the suction cup holder 608 to extend outwards, so that the suction cup holder 608 contacts the packaging bag. The suction cup is externally connected to a negative pressure device, and the packaging bag is sucked by negative pressure to open the bag mouth to both sides.

[0037] Before heat-sealing the packaging bag, it is necessary to flatten the bag mouth to improve the heat-sealing effect. The following provides a structure for flattening the bag mouth: Specifically, refer to Figure 10 and Figure 11 , at the top inside the fixed cover 101, a first cylinder 601 is connected. The suction pipe 105 is connected to the output end of the first cylinder 601. The first cylinder 601 pushes the suction pipe 105 to move up and down. Second cylinders 602 are connected inside both the movable cover 102 and the fixed cover 101. The sealing frame 104 is connected to the output end of the second cylinder 602. When the second cylinder 602 extends, the symmetrical sealing frames 104 will clamp on both sides of the bag mouth of the packaging bag. The clamping frame 103 includes a fixed plate 603 and movable plates 604 on both sides of the fixed plate 603. The movable plates 604 are slidably connected to the fixed plate 603 and can extend out from both sides. At the top of the movable plate 604, a clamping jaw 605 is rotatably connected. The clamping jaw 605 is used to fix the packaging from both sides. On the side of the fixed plate 603 away from the suction pipe 105, a third cylinder 606 is connected. 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 acts, the movable plate 604 is pushed out to both sides through the connecting rod 607, so that the movable plate 604 drives the packaging bag to be pulled to both sides to flatten it and avoid wrinkles. 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 , inside the movable plate 604, a fifth cylinder 613 is connected. Inside the clamping jaw 605, a rotating tube 610 is fixedly connected. The rotating tube 610 is rotatably connected inside the movable plate 604. When the rotating tube 610 rotates, it will drive the clamping jaw 605 to rotate. An inclined chute 611 is provided inside the rotating tube 610. The extending end of the fifth cylinder 613 is connected with a slider located in the inclined chute 611. When the fifth cylinder 613 extends upwards, the slider will slide in the inclined chute 611, thereby driving the clamping jaw 605 to rotate. The movable cover 102 needs to be able to open upward to facilitate loading and unloading. The following provides a structure for driving the opening and closing of the movable cover 102: A opening and closing frame 612 is connected to the top of the movable cover 102. The movable cover 102 and the opening and closing frame 612 are hinged to adapt to the state when closing with the fixed cover 101. The opening and closing frame 612 and the fixed cover 101 are hinged. 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, by the lever principle, the movable cover 102 can be made to cover on the fixed cover 101.

[0038] A method for vacuum extraction of a food packaging bag includes the following steps: S1. Loading: The packaging bag containing food is placed on the clamping rack 103 through an external loading device. The clamping jaws 605 on both sides of the upper part of the clamping rack 103 rotate to clamp the packaging bag. At this time, the sixth cylinder 614 acts, and drives the movable cover 102 to flip downward through the opening and closing frame 612 and cover on the fixed cover 101. The symmetric clamping racks 103 clamp both sides of the packaging bag. S2. Flattening: The suction cup rack 608 on the fixed plate 603 generates negative pressure. The fourth cylinder 609 drives the suction cup rack 608 to extend and retract to open the packaging bag mouth. The first cylinder 601 drives the air extraction pipe 105 to insert into the packaging bag. Subsequently, the movable plate 604 moves to both sides to flatten the packaging bag to facilitate fixing the packaging bag mouth. S3. Air extraction: The sealing racks 104 on both sides extend to clamp the bag mouth position. The heat-sealing press head 201 in the sealing rack 104 first extends to perform heat-sealing on both ends of the bag mouth position, and retracts after heat-sealing. The external negative pressure device is started, and the gas in the packaging bag is extracted through the air extraction pipe 105. S4. Sealing: The first cylinder 601 drives the air extraction pipe 105 to retract upward. At this time, the roller rack 112 drives the shaping component and the sealing component to press on the packaging bag and move upward synchronously with the air extraction pipe 105. The shaping component on the roller rack 112 rotates in the reverse direction to scrape the packaging bag upward to keep it flat. The sealing component seals the bag mouth position. S5. Unloading: After sealing, the movable cover 102 opens upward, and the clamping jaws 605 rotate in the reverse direction. At this time, the clamping jaws 605 lose the ability to fix the packaging bag, and the packaging bag falls onto the conveying device below.

[0039] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantive changes and substitutions made by those skilled in the art based on the present invention belong to 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 comprises a fixed cover (101) and a movable cover (102) that cooperate with each other, and opposite surfaces 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). An elliptical air extraction pipe (105) is arranged in the fixed cover (101), and 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), 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; the sealing component and the shaping component are externally connected to a rotation drive device.

2. A vacuum sealing device for food packaging bags according to claim 1, characterized in that: 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), the side hydraulic cylinder comprises a sleeve (202) and an extension rod (203) sleeved in the sleeve (202), an 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); One end of the extension rod (203) is connected to a fixed platform (207) located on the heat sealing head (201); the bidirectional oil circuit passes through the interior 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) in an up-and-down sliding manner; a through hole matching the bidirectional oil circuit is provided inside the connecting block (209); and a lifting drive device is externally connected to the top of the connecting block (209).

3. A vacuum sealing device for food packaging bags according to claim 2, characterized in that: One end of the extension rod (203) close to the heat sealing head (201) is connected to a fixed block (210); a moving block (211) is slidably connected inside the fixed block (210); 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); and the active block (215) drives the driven block (216) to be inserted into the groove on the connecting block (209).

4. A vacuum sealing device for food packaging bags 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), a second piston plate (219) is slidably connected to the bottom of the second sliding chamber (213), the second piston plate (219) and the extrusion oil chamber (212) are connected via a spring, an extension rod (220) in contact with the second piston plate (219) is connected to the bottom of the active block (215), and a top of the active block (215) and the second sliding chamber (213) are connected via a spring.

5. The vacuum sealing device for 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 signal-connected to the pressure sensor.

6. The vacuum sealing device for food packaging bag according to claim 5, characterized in that: The shaping component comprises 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 communicated with 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. A vacuum sealing device for food packaging bags 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); the distance measuring cylinder (402) is rotatably connected to a 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 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) comprises a fixed plate (603), 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 a side of the symmetrical fixed plate (603) facing each other, 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 food packaging bag according to claim 8, characterized in that: The movable plate (604) is internally connected to a fifth cylinder (613), the clamping jaw (605) is internally fixedly connected to a rotating tube (610), an oblique sliding groove (611) is provided inside the rotating tube (610), and the extended end of the fifth cylinder (613) is connected to a sliding block located in the oblique sliding groove (611).

10. A method for vacuum extraction of food packaging bags, using a vacuum sealing device for food packaging bags 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 mouth of the packaging bag, and the suction pipe (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 the two 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 pipe (105) to retract upward, and at this time, the roller frame (112) drives the shaping component and the sealing component to press on the packaging bag and move upward synchronously with the vacuum pipe (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, and the clamping claw (605) rotates in the opposite direction, losing the ability to fix the packaging bag. At this time, the packaging bag falls onto the conveyor belt below.

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