A vacuum sealer

Abstract

The present invention relates to a vacuum sealer, which comprises a frame, on which a material transportation device, a heat sealing device and a vacuum pumping device are provided. The heat sealing device includes a traction driving source, a heat sealing traction mechanism and a heat sealing mechanism; a first material passing gap is arranged in the heat sealing traction mechanism; the vacuum pumping device includes a transition traction mechanism and a vacuum pumping traction mechanism with a suction pipe at one end and used for sealing and transporting the bag mouth, and the discharging end of the transition traction mechanism is connected to the discharging end of the heat sealing mechanism; a second material passing gap is arranged in the transition traction mechanism, and the suction pipe can be slidably arranged in the second material passing gap along the material transportation direction. The beneficial effects of the present invention are as follows: when the bag mouth enters the heat sealing traction mechanism and is transported to the heat sealing mechanism, it is always sealed and transported by the transition traction mechanism, which can ensure good heat sealing effect and more stable transportation; the two traction mechanisms form two sealed areas at the bag mouth, improving the vacuum pumping effect.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum packaging, in particular to a vacuum sealing machine. Background Art

[0002] A sealing machine is a machine that seals packaging bags containing products. After the products are put into the packaging bags, in order to keep the products sealed and preserved, maintain product quality, and avoid product loss, the packaging bags need to be sealed. This operation is completed by a sealing machine.

[0003] In particular, some products need to be vacuum packaged, so some vacuum sealing machines have appeared on the market. For example, the patent with publication number "CN206502078U" discloses a vacuum sealing machine, including a conveying platform, a machine body, a vacuum mechanism, a sealing mechanism and a printing mechanism arranged on the machine body in sequence, the conveying platform is arranged in front of the machine body, the sealing mechanism includes a conveyor belt for conveying bags arranged up and down, an elastic clamping mechanism arranged along the conveyor belt, a heat sealing mechanism and a cooling mechanism; the vacuum mechanism has a horizontally movable air nozzle, and the horizontally movable air nozzle is arranged to continue the air extraction process into the conveyor belt, and the elastic clamping mechanism arranged at the entrance section of the conveyor belt elastically clamps the entering air nozzle; the air nozzle is reset by a reset mechanism after being retracted backwards, and the reset mechanism is a scroll spring connected to one end of the vacuum mechanism.

[0004] However, the above technical solution still has the following problems:

[0005] First, although this technical solution can solve the problem that when the air nozzle is separated from the product, the bag mouth cannot be sealed and some gas enters, resulting in poor vacuum effect, but before the bag mouth is transported to the heat sealing mechanism, the bag mouth loses its force and cannot be sealed for transportation. Figure 12 As shown, attached Figure 12 If the A in the figure fails to achieve complete sealing, the bag mouth may open, which may cause gas to enter, affecting the vacuum effect and the heat sealing effect, resulting in products with poor heat sealing such as seal wrinkles;

[0006] Second, in order to achieve a good sealing effect, the heat sealing mechanism needs to keep the gap between the upper and lower transmission belts small enough, while the air nozzle of the vacuum assembly moves in the transmission belt of the sealing mechanism. Since the size of the air nozzle is often much larger than the size of the bag opening, the air nozzle will expand the gap between the upper and lower transmission belts, which may easily lead to a loose heat seal. Therefore, when the vacuum assembly and the heat sealing mechanism are transported by the same set of transmission belts, there will be conflicting requirements on the size of the gap.

[0007] Third, in this technical solution, the reset mechanism is a volute spring connected to one end of the vacuum pumping mechanism. During the movement of the air nozzle, the volute spring is stretched, causing it to deform and store elastic force for the reset of the air nozzle. However, the stored elastic force also becomes a resistance during the movement of the air nozzle, resulting in unsmooth movement of the air nozzle. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a vacuum sealer in view of the deficiencies of the above-mentioned prior art. The additional transition traction mechanism can prevent gas from entering the product when the bag mouth leaves the vacuum pumping traction mechanism and enters the heat sealing traction mechanism and is transported to the heat sealing mechanism, while ensuring good heat sealing effect and more stable transportation; the additional vacuum pumping traction mechanism increases the contact area between the bag mouth and the two traction mechanisms, forming two sealed areas, improving the vacuum pumping effect; the air extraction pipe uses a rodless cylinder to achieve reset, avoiding the influence of the reaction force generated by the stretching of the volute spring in the prior art on the smooth movement of the air extraction pipe.

[0009] To achieve the above object, the present invention provides the following technical solution: A vacuum sealer includes a frame, on which a material transportation device, a heat sealing device, and a vacuum pumping device provided at the feeding end of the heat sealing device are arranged. The heat sealing device includes a traction driving source, a heat sealing traction mechanism, and a heat sealing mechanism arranged along the transportation direction of the heat sealing traction mechanism; a first material passing gap is provided in the heat sealing traction mechanism; the vacuum pumping device includes an air extraction mechanism with an air extraction pipe at one end, and is characterized in that: the vacuum pumping device further includes a transition traction mechanism for sealing and transporting the bag mouth, the transition traction mechanism is arranged parallel to the heat sealing traction mechanism and is arranged between the heat sealing traction mechanism and the material transportation device, and the discharging end of the transition traction mechanism is connected to the discharging end of the heat sealing mechanism; a second material passing gap is provided in the transition traction mechanism, and the second material passing gap and the first material passing gap can be penetrated by the same horizontal plane; the air extraction pipe can be slidably arranged in the second material passing gap along the material transportation direction.

[0010] Adopting the above technical solution has the following advantages:

[0011] On the one hand, an additional transitional traction mechanism for sealing and transporting the product bag mouth is provided. A second material passing gap is arranged inside the transitional traction mechanism for the air extraction pipe and the bag mouth to pass through. The transitional traction mechanism is arranged between the heat sealing traction mechanism and the material transportation device, that is, the transitional traction mechanism and the heat sealing traction mechanism are arranged in a staggered manner, and the second material passing gap and the first material passing gap can be penetrated by the same horizontal plane, that is, the bag mouth of the product can enter the first material passing gap from the second material passing gap. Therefore, the transitional traction mechanism and the heat sealing traction mechanism can respectively traction different areas of the bag mouth. Since the discharge end of the transitional traction mechanism is connected to the discharge end of the heat sealing mechanism, when the product enters the heat sealing mechanism for sealing, the bag mouth is still under the sealed transportation of the transitional traction mechanism until the product exits from the discharge end of the transitional traction mechanism and the discharge end of the heat sealing mechanism, that is, during the process of the product from the start of heat sealing to the completion of heat sealing, it is always under the sealed transportation of the transitional traction mechanism. One of the feasible ways of sealed transportation can be realized by clamping the bag mouth through the transmission belt in the pressing working transportation state. In this way, the possibility of the bag mouth opening at this time can be effectively eliminated, preventing gas from entering the product, ensuring the vacuum pumping effect, and at the same time, the product bag mouth is sealed and pressed into the heat sealing mechanism to ensure good heat sealing effect.

[0012] On the other hand, the size of the second material passing gap can be set differently from that of the first material passing gap of the heat sealing traction mechanism. That is, the first material passing gap of the heat sealing mechanism can be set small enough to fit the gap at the sealing part of products such as packaging belts, while the second material passing gap can be appropriately increased so that the air extraction pipe and the opening part of products such as packaging belts can move within the second material passing gap. The air extraction pipe only moves within the second material passing gap and does not enter the first material passing gap. In this way, the situation in the prior art that "the requirements for the gap size are mutually contradictory when the vacuum pumping mechanism and the heat sealing mechanism transport the bag mouth through the same set of transmission belts" is avoided, meeting the different gap requirements for vacuum pumping and heat sealing, ensuring the vacuum pumping effect while ensuring the heat sealing effect, and avoiding the situation of poor heat sealing such as loose sealing due to too large a gap. At the same time, the two problems existing in the existing vacuum sealing machines mentioned in the background technology are solved.

[0013] The above-mentioned vacuum sealing machine can be further set as follows: The vacuum pumping device further includes a vacuum pumping traction mechanism for sealing and transporting the bag mouth. The vacuum pumping traction mechanism is arranged in parallel on the side of the transitional traction mechanism away from the material transportation device. A third material passing gap is arranged inside the vacuum pumping traction mechanism, and the third material passing gap and the second material passing gap can be penetrated by the same horizontal plane. One end of the vacuum pumping traction mechanism is synchronously linked with the transitional traction mechanism, and the other end is connected to the feeding end of the heat sealing traction mechanism.

[0014] With the above technical solution, the vacuum pumping and traction mechanism is also used for the sealed transportation of the bag mouth. The vacuum pumping and traction mechanism is arranged parallel to one side of the transition traction mechanism, and one end of the vacuum pumping and traction mechanism is synchronously linked with the transition traction mechanism, which can ensure the synchronous operation of the vacuum pumping and traction mechanism and the transition traction mechanism, and jointly transport the bag mouth. The third material passing gap and the second material passing gap can be passed through by the same horizontal plane, that is, the vacuum pumping and traction mechanism and the transition traction mechanism jointly conduct the sealed transportation of the bag mouth, and the contact areas with the bag mouth are different. On the one hand, the contact area between the bag mouth and the two traction mechanisms is increased, the friction force is large, the traction force is large, and the transportation is more stable; on the other hand, during the vacuum pumping stage, two sealed areas are formed (that is, the areas where the vacuum pumping and traction mechanism and the transition traction mechanism are in contact with the bag mouth), ensuring that the air in the bag can be pumped out by the air extraction pipe and improving the vacuum pumping effect.

[0015] The above-mentioned vacuum sealing machine can be further set as follows: the transition traction mechanism includes a second belt assembly arranged up and down, the second material passing gap is arranged between the second belt assemblies, and the second belt assembly includes a second belt, a traction driving wheel, and a traction transmission wheel; the vacuum pumping and traction mechanism includes a third belt assembly, the third material passing gap is arranged between the third belt assemblies, and the third belt assembly includes a third belt and a traction driven wheel; the traction transmission wheels are respectively matched with the second belt and the third belt; the traction driving wheel and the traction driven wheel are arranged on the same side of the traction transmission wheel close to the heat sealing mechanism; the traction driving wheel is linked with the traction driving source through a first synchronous belt assembly; the first synchronous belt assembly includes a first synchronous belt, a first driving synchronous wheel driven by the traction driving source to rotate, and a first driven synchronous wheel arranged to rotate coaxially with the traction driving wheel.

[0016] With the above technical solution, the second belt assembly of the transition traction mechanism and the third belt assembly of the vacuum pumping and traction mechanism realize the traction transportation of the product bag mouth, and the second belt assembly and the third belt assembly achieve synchronous operation through the traction transmission wheel. The traction driving source is used to drive the heat sealing mechanism. Due to the setting of the first synchronous belt assembly, the traction driving source can drive the second belt assembly and the third belt assembly to move simultaneously, that is, the traction driving source drives the first driving synchronous wheel of the first synchronous belt assembly to rotate, and then drives the first synchronous belt and the first driven synchronous wheel to work. The rotation of the first driven synchronous wheel drives the traction driving wheel to rotate, and then drives the third belt and the traction transmission wheel to move. The rotation of the traction transmission wheel drives the third belt and the traction driven wheel to move, that is, the second belt assembly and the third belt assembly can perform synchronous traction transportation. In this way, there is no need to additionally set up a driving source, which ensures good synchronism of each belt assembly while keeping the cost low.

[0017] The above-mentioned vacuum sealer can be further configured as follows: both the second conveyor belt assembly and the third conveyor belt assembly include a belt pressing assembly for pressing the conveyor belt to seal the bag opening. The belt pressing assembly includes an upper belt pressing part and a lower belt pressing part. Both the upper belt pressing part and the lower belt pressing part include mounting brackets connected to the machine frame, and a plurality of belt pressing wheels that fit the conveyor belt are provided on the mounting brackets.

[0018] With the above technical solution, the upper belt pressing part and the lower belt pressing part of the belt pressing assembly are installed on the machine frame through the mounting brackets, so that the belt pressing wheels fit the conveyor belts (i.e., the second conveyor belt and the third conveyor belt), exert a force on the second conveyor belt and the third conveyor belt, increase the friction and sealing force on the product bag opening, realize the sealed transportation of the bag opening, prevent the bag opening from opening, and facilitate the evacuation tube to perform the vacuum evacuation work.

[0019] The above-mentioned vacuum sealer can be further configured as follows: at least two groups of heat sealing mechanisms are arranged in sequence along the material transportation direction, and the discharge end of the transition traction mechanism is connected between any two adjacent heat sealing mechanisms.

[0020] With the above technical solution, at least two groups of heat sealing mechanisms are provided for heat sealing the product bag opening multiple times. Between two adjacent heat sealing mechanisms are the discharge end of the previous heat sealing mechanism and the feed end of the other heat sealing mechanism. One end of the transition traction mechanism is connected between any two adjacent heat sealing mechanisms, that is, the discharge end of the transition traction mechanism is connected to the discharge end of one heat sealing mechanism and the feed end of the other heat sealing mechanism, ensuring that during one heat sealing, the bag opening can still be pulled by the transition traction mechanism until one heat sealing is completed, so that the bag opening is initially heat-sealed. Subsequently, the bag opening that has completed one heat sealing enters the second heat sealing, further ensuring the heat sealing effect and preventing the phenomenon of insecure heat sealing.

[0021] The above-mentioned vacuum sealer can be further configured as follows: the evacuation mechanism further includes a slide rail disposed on one side of the transition traction mechanism, and the slide rail is arranged along the material transportation direction; an exit assembly for controlling the evacuation tube to withdraw from the second material passing gap is provided on the slide rail; the exit assembly includes a first rodless cylinder, the first rodless cylinder includes a first cylinder bracket, the first cylinder bracket is connected to the slide rail, a first guide rail is provided on the first cylinder bracket, the first guide rail is arranged at an angle to the material transportation direction, and a first cylinder slider is slidably provided on the first guide rail; the evacuation tube is installed on the first cylinder slider.

[0022] With the above technical solution, the air extraction pipe slides through the slide rail and moves together with the bag mouth under the action of the ferry traction mechanism. During transportation, while the heat sealing mechanism heat-seals one end of the product, the vacuum extraction assembly continuously extracts the air inside the product at the other end of the product; it is possible to synchronously perform the steps of transporting the product, heat-sealing the product, and extracting vacuum. There is no need for any pause or waiting time during the processing. When the product moves from the feeding end to the discharging end of the material transportation device, the vacuum extraction and heat-sealing work can be completed, greatly improving the production efficiency; the provided withdrawal assembly is used to timely withdraw the air extraction pipe from the second material passing gap, that is, from the product bag mouth. The withdrawal assembly specifically includes a first rodless cylinder. The first guide rail of the first rodless cylinder has its own guiding function and is arranged at an angle to the material transportation direction. That is, when the first cylinder slider moves and retracts on the first guide rail after being ventilated, there is an angle with the material transportation direction, and the best angle is 90°, that is, perpendicular to the material transportation direction, which can make the path for the air extraction pipe to withdraw from the second material passing gap, that is, from the product bag mouth, the shortest, and the withdrawal action is rapid, avoiding gas from entering the product. After pushing the withdrawal assembly to the original position on the slide rail, the first cylinder slider can move to the initial position, that is, drive the air extraction pipe to extend again, preparing for the next vacuum extraction work.

[0023] For the above-mentioned vacuum sealing machine, it can be further set that: on one side of the slide rail, there is a reset assembly for pushing the air extraction pipe to move to the original position on the slide rail. The reset assembly includes a second rodless cylinder. The second rodless cylinder includes a second cylinder bracket installed on the machine frame. A second guide rail is provided on the second cylinder bracket. The second guide rail is arranged parallel to the material transportation direction. A second cylinder slider that can push the withdrawal assembly to move is slidably arranged on the second guide rail.

[0024] With the above technical solution, the reset assembly is used for the automatic reset of the withdrawal assembly. The reset assembly includes a second rodless cylinder, and the second guide rail of the second rodless cylinder plays a guiding role by itself; when the air extraction pipe is transported under the action of the second conveyor belt and the third conveyor belt, the air extraction pipe drives the withdrawal assembly to slide on the slide rail. After the air extraction pipe completes the vacuum extraction and needs to be reset, after being ventilated, the second cylinder slider pushes the withdrawal assembly to slide to the original position on the slide rail, thereby driving the air extraction pipe to move to the original position, preparing for the next vacuum extraction work.

[0025] For the above-mentioned vacuum sealing machine, it can be further set that: on the side of the air extraction pipe away from the heat sealing mechanism, there is a sealing insert.

[0026] With the above technical solution, the sealing insert can enter the product opening together with the air extraction pipe and play a supporting role. It can prevent, for example, the packaging bag from being adsorbed on the outer periphery of the air extraction pipe due to the change in air pressure during the air extraction process, which may cause the air extraction pipe to be difficult to withdraw or even drive the product to move together, and is beneficial for the air extraction pipe to quickly withdraw from the product bag mouth.

[0027] The above-mentioned vacuum sealer can be further configured as follows: The heat-sealing traction mechanism includes a first conveyor belt assembly arranged vertically, and a first material-passing gap is arranged between the upper and lower first conveyor belt assemblies; the first conveyor belt assembly includes a first conveyor belt, a feeding driving wheel, and a feeding driven wheel; the feeding driving wheel is linked with a traction driving source through a second synchronous belt assembly; the second synchronous belt assembly includes a second synchronous belt, a second driving synchronous wheel driven by the traction driving source to rotate, and a second driven synchronous wheel rotatably arranged coaxially with the feeding driving wheel; the material transportation device includes a conveyor belt, a conveying driving roller, and a conveying driven roller. One end of the conveying driving roller is connected with a transmission assembly, the transmission assembly is connected with a driving wheel, and the driving wheel is linked with the feeding driving wheel through a third synchronous belt assembly; the third synchronous belt assembly includes a third synchronous belt, a third driving synchronous wheel rotatably arranged coaxially with the feeding driving wheel, and a third driven synchronous wheel rotatably arranged coaxially with the driving wheel.

[0028] With the above technical solution, the second synchronous belt assembly includes a second synchronous belt, a second driving synchronous wheel driven by the traction driving source to rotate, and a second driven synchronous wheel coaxially arranged with the second driving synchronous wheel. The traction driving source drives the feeding driving wheel to rotate through the second synchronous belt assembly, and then drives the first conveyor belt and the feeding driven wheel to rotate, so as to drive the heat-sealing traction mechanism to work; when the feeding driving wheel rotates, it drives the driving wheel to rotate through the third synchronous belt assembly, and the driving wheel drives the conveying driving roller to rotate through the transmission assembly, and then drives the conveyor belt and the conveying driven roller to work. That is, when the heat-sealing traction mechanism is driven by the traction driving source, the material transportation device is also driven by the traction driving source. Thus, the heat-sealing traction mechanism, the vacuum-pumping traction mechanism, the transition traction mechanism, and the material transportation device are all driven by the traction driving source, and there is no need to independently set a driving source for each mechanism, and at the same time, the synchronism among the heat-sealing traction mechanism, the transition traction mechanism, the vacuum-pumping traction mechanism, and the material transportation device is stronger.

[0029] The above-mentioned vacuum sealer can be further configured as follows: The transmission assembly includes a first universal joint connected to one end of the conveying driving roller, the first universal joint is connected with a transmission rod, the other end of the transmission rod is connected with a second universal joint, and the second universal joint is connected with the driving wheel.

[0030] With the above technical solution, when the driving wheel rotates, it drives the second universal joint, the transmission rod, and the first universal joint to rotate in sequence, and then drives the conveying driving roller to rotate. The two universal joints provided can enable the driving wheel axis and the conveying driving roller axis to be transmitted when they are not on the same straight line, and the installation position of the conveying driving roller is more free.

[0031] The beneficial effects of the present invention are:

[0032] First, the added transition traction mechanism, on the one hand, when the bag mouth leaves the vacuum traction mechanism and enters the heat sealing traction mechanism to be transported to the heat sealing mechanism, there is still a compression limit of the transition traction mechanism, thereby preventing the bag mouth from opening at this time, preventing gas from entering the product, and ensuring a good heat sealing effect and more stable transportation; on the other hand, the second feeding gap set by it can be set to be different from the first feeding gap of the heat sealing traction mechanism, and the exhaust pipe only moves in the second feeding gap and does not enter the first feeding gap, meeting the different gap requirements of vacuum evacuation and heat sealing, ensuring the vacuum evacuation effect while ensuring the heat sealing effect, and avoiding the situation of poor heat sealing such as loose sealing due to too large a gap;

[0033] Second, a vacuum traction mechanism is added to increase the contact area between the bag opening and the two traction mechanisms, resulting in greater friction and traction, and more stable transportation; at the same time, during the vacuum stage, two sealing areas are formed (i.e., the area where the vacuum traction mechanism, the transition traction mechanism and the bag opening are in contact), ensuring that the air in the bag can be extracted by the vacuum pipe, thereby improving the vacuum effect;

[0034] Third, the exhaust pipe is reset by a rodless cylinder. When the exhaust pipe moves following the third transmission belt assembly and the second transmission belt assembly, the reaction force generated by the volute spring stretching in the prior art is avoided to affect the smoothness of the exhaust pipe movement.

[0035] Fourth, the sliding setting of the vacuum pipe can realize the steps of heat sealing and vacuuming of the product when the product is transported. The processing process does not require any stopping or waiting time. The vacuuming and heat sealing work can be completed when the product moves from the feeding end to the discharging end of the material transportation device, which greatly improves the production efficiency.

[0036] The present invention is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the present invention;

[0038] Figure 2 It is a front structural schematic diagram of the sealing and pulling device and the vacuuming device of the present invention;

[0039] Figure 3 It is a front structural schematic diagram of the sealing and pulling device and the vacuuming device of the present invention;

[0040] Figure 4 It is a partial front structural schematic diagram of the heat-sealing traction mechanism of the present invention;

[0041] Figure 5 It is a schematic diagram of the back structure of the heat-sealing traction mechanism of the present invention;

[0042] Figure 6Schematic structural diagram of the vacuum pumping assembly of the present invention;

[0043] Figure 7 Front structural diagram of the transition traction mechanism and the vacuum pumping traction mechanism of the present invention;

[0044] Figure 8 Back structural diagram of the transition traction mechanism and the vacuum pumping traction mechanism of the present invention;

[0045] Figure 9 Schematic structural diagram of the pressure belt assembly of the present invention;

[0046] Figure 10 Partial structural diagram of the transmission assembly of the present invention;

[0047] Figure 11 Schematic diagram of the bag mouth traction of the present invention;

[0048] Figure 12 Schematic diagram of the bag mouth traction of the prior art. Detailed implementation manner

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

[0050] As Figures 1 to 11 shown, a vacuum sealer includes a machine frame 1, on which a material transportation device 2, a heat sealing device 3, and a vacuum pumping device 4 provided at the feeding end of the heat sealing device 3 are provided.

[0051] As Figures 4 to 5 shown, the heat sealing device 3 includes a traction drive source 31, a heat sealing traction mechanism 32, a heat sealing mechanism 33 arranged along the transportation direction of the heat sealing traction mechanism 32, and a cooling mechanism 34; the heat sealing traction mechanism 32 includes upper and lower first transmission belt assemblies (32a, 32b), and a first material passing gap is arranged between the upper and lower first transmission belt assemblies (32a, 32b); the first transmission belt assemblies (32a, 32b) include a first transmission belt 321, a feeding driving wheel 322, a feeding driven wheel 323, and a tensioning wheel 324, and the feeding driving wheels 322 of the two first transmission belt assemblies (32a, 32b) are driven and transmitted through a gear structure; the first transmission belt assemblies (32a, 32b) are driven to work by the traction drive source 31.

[0052] In this embodiment, two heat-sealing mechanisms 33 are provided, which can perform heat-sealing twice. The existing technology can be adopted. For the convenience of understanding, it is explained here: The heat-sealing mechanism 33 includes an upper heating block 331 and a lower heating block 332, which are respectively arranged on both sides of the first material-passing gap. The upper heating block 331 is located below the lower part of the first conveyor belt 321 arranged above, and the lower heating block 332 is located above the upper part of the first conveyor belt 321 arranged below, as shown in the figure; the upper heating block 331 squeezes the first conveyor belt 321 between the two and the upper heating block 331 approaches the lower heating block 332 to seal the opening part of the product in the first material-passing gap. The cooling mechanism 34 helps the product sealing part to be quickly shaped, including an upper heat dissipation block 341, a lower heat dissipation block 342, and a heat dissipation fan 343. The installation methods of the upper and lower heat dissipation blocks and the upper and lower heating blocks are the same, so they will not be elaborated here.

[0053] As Figure 6 shown, the vacuum pumping device 4 includes a gas pumping mechanism, a transition traction mechanism 41 for sealing and transporting the bag mouth, and a vacuum pumping traction mechanism 42.

[0054] The gas pumping mechanism includes a gas pumping driving source 49, a gas pumping pipe 43, and a slide rail 44 arranged on one side of the transition traction mechanism 41. The slide rail 44 is arranged along the material transportation direction; an exit assembly 45 for controlling the gas pumping pipe 43 to exit the second material-passing gap is provided on the slide rail 44; the exit assembly 45 includes a first rodless cylinder, and the first rodless cylinder includes a first cylinder bracket 451. The first cylinder bracket 451 is connected to the slide rail 44, and a first guide rail 452 is provided on the first cylinder bracket 451. The first guide rail 452 is arranged at an angle to the material transportation direction. In this embodiment, it is arranged vertically, that is, 90°. A first cylinder slider 453 is slidably arranged on the first guide rail 452; the gas pumping pipe 43 is installed on the first cylinder slider 453, and a sealing insert 46 is provided on the side of the gas pumping pipe 43 away from the heat-sealing mechanism 33.

[0055] A reset assembly 47 is provided on one side of the slide rail 44. The reset assembly 47 includes a second rodless cylinder. The second rodless cylinder includes a second cylinder bracket 471 installed on the frame 1. A second guide rail 472 is provided on the second cylinder bracket 471. The second guide rail 472 is arranged parallel to the material transportation direction, and a second cylinder slider 473 that can push the first cylinder bracket 451 to move is slidably arranged on the second guide rail 472.

[0056] As Figures 7 to 8 shown, the transition traction mechanism 41 is arranged parallel to the heat-sealing traction mechanism 32, and is arranged between the heat-sealing traction mechanism 32 and the material transportation device 2. The discharge end of the transition traction mechanism 41 is connected between the two heat-sealing mechanisms 33.

[0057] The transition traction mechanism 41 includes second conveyor belt assemblies (41a, 41b) arranged vertically. A second material passing gap is provided between the two second conveyor belt assemblies (41a, 41b). The second material passing gap and the first material passing gap allow the same horizontal plane to pass through. The air extraction pipe 43 is slidably arranged in the second material passing gap along the material transportation direction. The second conveyor belt assemblies (41a, 41b) include second conveyor belts 411, traction driving wheels 412, and traction driven wheels 413. The traction driving wheels 412 of the two second conveyor belt assemblies (41a, 41b) are meshed and driven through a gear structure;

[0058] The vacuum extraction traction mechanism 42 is arranged in parallel on one side of the transition traction mechanism 41 away from the material transportation device 2. The discharge end of the vacuum extraction traction mechanism 42 is connected to the feed end of the heat sealing traction mechanism 32. The vacuum extraction traction mechanism 42 includes third conveyor belt assemblies (42a, 42b). A third material passing gap is provided between the two third conveyor belt assemblies (42a, 42b). The third material passing gap and the second material passing gap allow the same horizontal plane to pass through. The third conveyor belt assemblies (42a, 42b) include third conveyor belts 421 and traction driven wheels 422. The traction driven wheels 413 are respectively matched with the second conveyor belts 411 and the third conveyor belts 421. The traction driving wheels 412 and the traction driven wheels 422 are arranged on the same side of the traction driven wheels 413 close to the heat sealing mechanism 33. Thus, the vacuum extraction traction mechanism 42 and the transition traction mechanism 41 operate synchronously to jointly transport the bag mouth, and the areas in contact with the bag mouth are different; increasing the contact area between the bag mouth and the two traction mechanisms, as Figure 11 shown, constitutes two sealed areas to ensure the vacuum extraction effect. In the prior art, the bag mouth traction method is as Figure 12 shown. When one end of the packaging bag is transported between the vacuum extraction traction mechanism 42 and the heat sealing mechanism, the sealed transportation of the vacuum extraction traction mechanism 42 is lost, and the packaging bag is likely to open at point A, resulting in poor vacuum extraction effect.

[0059] Both the second conveyor belt assemblies (41a, 41b) and the third conveyor belt assemblies (42a, 42b) include press belt assemblies 48 for pressing the conveyor belts to seal the bag mouth, realizing the sealed transportation of the bag mouth. As Figure 9 shown, the press belt assembly 48 specifically includes an upper press belt part 48a and a lower press belt part 48b. Both the upper press belt part 48a and the lower press belt part 48b include mounting brackets 481 connected to the frame 1. A number of press belt wheels 482 that fit with the conveyor belts are provided on the mounting brackets 481. The press belt wheels 482 exert forces on the second conveyor belts 411 and the third conveyor belts 421, increasing the friction and sealing force on the product bag mouth, preventing the bag mouth from opening, and facilitating the air extraction pipe 43 to perform the air extraction work.

[0060] To reduce the drive sources and cut costs, the heat-sealing traction mechanism 32, the transition traction mechanism 41, the vacuum-pumping traction mechanism 42, and the material transportation device 2 of the present invention are all driven by the traction drive source 31, as Figure 3 shown. Specifically, it is manifested as follows:

[0061] For the transition traction mechanism 41, the traction driving wheel 412 is linked with the traction drive source 31 through the first synchronous belt assembly 5; the first synchronous belt assembly 5 includes a first synchronous belt 51, a first driving synchronous wheel 52 driven by the traction drive source 31 to rotate, and a first driven synchronous wheel 53 rotatably arranged coaxially with the traction driving wheel 412. For the vacuum-pumping traction mechanism 42, since the second belt transmission assembly (41a, 41b) and the third belt transmission assembly (42a, 42b) achieve synchronous operation through the traction transmission wheel 413; the traction drive source 31 drives the first driving synchronous wheel 52 of the first synchronous belt assembly 5 to rotate, thereby driving the first synchronous belt 51 and the first driven synchronous wheel 53 to work. The rotation of the first driven synchronous wheel 53 drives the traction driving wheel 412 to rotate, thereby driving the third transmission belt 421 and the traction transmission wheel 413 to move. The rotation of the traction transmission wheel 413 drives the third transmission belt 421 and the traction driven wheel 422 to move, that is, the second belt transmission assembly (41a, 41b) and the third belt transmission assembly (42a, 42b) can perform traction transportation synchronously.

[0062] For the heat-sealing traction mechanism 32, the feeding driving wheel 322 is linked with the traction drive source 31 through the second synchronous belt assembly 6; the second synchronous belt assembly 6 includes a second synchronous belt 61, a second driving synchronous wheel 62 driven by the traction drive source 31 to rotate, and a second driven synchronous wheel 63 rotatably arranged coaxially with the feeding driving wheel 322; when the traction drive source 31 drives the second driving synchronous wheel 62 to rotate, the second driving synchronous wheel 62 drives the second synchronous belt 61 and the second driven synchronous wheel 63 to move. The second driven synchronous wheel 63 drives the feeding driving wheel 322 to rotate, and the feeding driving wheel 322 drives the first transmission belt 321, the feeding driven wheel 323, and the tensioning wheel 324 to move, and the heat-sealing traction mechanism 32 works.

[0063] The material transportation device 2 includes a conveyor belt, a conveying driving roller 21, and a conveying driven roller. As Figure 10As shown in the figure, one end of the conveying driving roller 21 is connected with a transmission assembly 22, the transmission assembly 22 is connected with a driving wheel 23, the transmission assembly 22 includes a first universal joint 221 with one end connected to the conveying driving roller 21, the first universal joint 221 is connected with a transmission rod 222, the other end of the transmission rod 222 is connected with a second universal joint 223, the second universal joint 223 is connected with the driving wheel 23, and the driving wheel 23 is linked with the feeding driving wheel 322 through a third synchronous belt assembly 7; the third synchronous belt assembly 7 includes a third synchronous belt 71, a third driving synchronous wheel 72 coaxially rotating with the feeding driving wheel 322, and a third driven synchronous wheel 73 coaxially rotating with the driving wheel 23. When the heat-sealing traction mechanism 32 works, the feeding driving wheel 322 rotates driven by the traction driving source 31, drives the third driving synchronous wheel 72 to rotate, further makes the third synchronous belt 71 and the third driven synchronous wheel 73 rotate, further makes the driving wheel 23 rotate, the driving wheel 23 drives the second universal joint 223, the transmission rod 222, and the first universal joint 221 to rotate in sequence, and then drives the conveying driving roller 21 to rotate to drive the conveyor belt to operate, and the material transportation device 2 works.

[0064] In this embodiment, an outlet wheel assembly 8 and a coding assembly 9 are sequentially arranged on the frame 1 at the outlet end of the heat-sealing traction mechanism 32; the outlet wheel assembly 8 includes an upper outlet wheel 81 and a lower outlet wheel 82, and one end of the lower outlet wheel 82 is linked with the third synchronous belt 71; the coding assembly 9 includes an inkjet cartridge 91, the inkjet cartridge 91 is provided with a feeding pressing plate 92 on one side close to the outlet wheel assembly 8, and the inkjet cartridge 91 is provided with a receiving plate 93 below the feeding pressing plate 92.

[0065] The working principle of the present invention is as follows:

[0066] Before the vacuum sealer is started, the air extraction pipe 43 is located at the feeding port of the transition traction mechanism 41, and the air extraction pipe 43 is aligned with the second material passing gap.

[0067] For the product to be sealed, its main body part is placed on the conveyor belt, and one end of the opening part (i.e., the part of the bag mouth to be sealed) is placed in the second material passing gap, and the air extraction pipe 43 and the sealing insert 46 are made to enter the other end of the opening part of the product.

[0068] Start the equipment, the traction driving source 31 works, and at the same time drives the heat-sealing traction mechanism 32, the transition traction mechanism 41, the vacuum extraction traction mechanism 42, and the material transportation device 2 to work.

[0069] The air extraction pipe 43 is pulled in the material transportation direction under the action of the second conveyor belt 411 and the third conveyor belt 421, so as to move synchronously with the product. The open part of the product enters the second and third material passing gaps. During transportation, the air extraction pipe 43 evacuates the inside of the product. Since the pressing belt assembly 48 presses the second conveyor belt 411 and the third conveyor belt 421, the bag opening of the product is under pressure and in a sealed state, enabling the air extraction pipe 43 to quickly evacuate the inside of the product;

[0070] As the product is transported, one end of the product first exits the third conveyor belt assembly (42a, 42b) of the vacuum extraction and traction mechanism 42 and enters the first conveyor belt assembly (32a, 32b) of the heat sealing and traction mechanism 32. Subsequently, one end of the product first enters the first group of heat sealing mechanisms 33 for heat sealing. The product continues to be transported, and heat sealing and vacuum extraction are carried out simultaneously at this time. When the other end of the product is about to exit the third conveyor belt assembly (42a, 42b), the vacuum extraction is completed. The air extraction pipe 43 exits the product under the control of the exit assembly 45. At this time, the second conveyor belt assembly (41a, 41b) of the transition traction mechanism 41 still seals and transports the bag opening to prevent gas from entering the product;

[0071] The air extraction pipe 43 that exits the product, under the action of the reset assembly 47, that is, the second rodless cylinder is ventilated, and the second cylinder slider 473 pushes the first cylinder bracket 451 of the exit assembly 45 to reset, so that the air extraction pipe 43 moves to its original position. At this time, the operator can place the next product to be sealed without waiting; and so on. Under the action of the second conveyor belt assembly (41a, 41b), the third conveyor belt assembly (42a, 42b), the exit assembly 45, and the reset assembly 47, the trajectory of the air extraction pipe 43 is rectangular, and the vacuum extraction work can be repeated.

[0072] Subsequently, the second conveyor belt assembly (41a, 41b) of the transition traction mechanism 41 and the first conveyor belt assembly (32a, 32b) of the heat sealing and traction mechanism 32 jointly transport the product. Subsequently, the first heat sealing of the product is completed and it enters the second heat sealing mechanism 33 for the second heat sealing. After the second heat sealing is completed, the sealed part of the product completely exits the second conveyor belt assembly (41a, 41b) of the transition traction mechanism 41. Subsequently, the first conveyor belt assembly (32a, 32b) of the heat sealing and traction mechanism 32 continues to transport, so that the sealed part of the product enters the cooling assembly for cooling.

[0073] After cooling is completed, the sealed part of the product exits the heat sealing and traction mechanism 32 and enters the discharge wheel assembly 8 and is sprayed with marks such as production date and shelf life by the inkjet printing assembly 9. Thus, the vacuum packaging of one product is completed. During the whole process, there is no need to stop the machine and wait, and the packaging efficiency is higher.

Claims

1. A vacuum sealer, comprising a frame, a material transport device, a heat-sealing device and a vacuum pumping device provided at the feed end of the heat-sealing device are provided on the frame. The heat-sealing device includes a traction drive source, a heat-sealing traction mechanism, and a heat-sealing mechanism arranged along the transport direction of the heat-sealing traction mechanism. A first material-passing gap is provided in the heat-sealing traction mechanism. The vacuum pumping device includes a gas pumping mechanism with a gas extraction pipe at one end, and is characterized in that: The vacuum pumping device further includes a transition traction mechanism for sealing and transporting the bag mouth. The transition traction mechanism is arranged parallel to the heat sealing traction mechanism and is disposed between the heat sealing traction mechanism and the material transporting device. The discharge end of the transition traction mechanism is connected to the discharge end of the heat sealing mechanism. A second material passing gap is provided in the transition traction mechanism, and the second material passing gap and the first material passing gap can be penetrated by the same horizontal plane. The air suction pipe can be slidably arranged in the second material passing gap along the material transporting direction. The vacuum pumping device further includes a vacuum pumping traction mechanism for sealing and transporting the bag mouth. The vacuum pumping traction mechanism is arranged parallel to the side of the transition traction mechanism away from the material transporting device. A third material passing gap is provided in the vacuum pumping traction mechanism, and the third material passing gap and the second material passing gap can be penetrated by the same horizontal plane. One end of the vacuum pumping traction mechanism is synchronously linked with the transition traction mechanism, and the other end is connected to the feeding end of the heat sealing traction mechanism. The transition traction mechanism includes a second belt transmission assembly arranged vertically. The second material passing gap is arranged between the second belt transmission assemblies. The second belt transmission assembly includes a second transmission belt, a traction driving wheel, and a traction transmission wheel. The vacuum pumping traction mechanism includes a third belt transmission assembly. The third material passing gap is arranged between the third belt transmission assemblies. The third belt transmission assembly includes a third transmission belt and a traction driven wheel. The traction transmission wheels are respectively engaged with the second transmission belt and the third transmission belt. The traction driving wheel and the traction driven wheel are arranged on the same side of the traction transmission wheel close to the heat sealing mechanism. The traction driving wheel is linked with a traction driving source through a first synchronous belt assembly. The first synchronous belt assembly includes a first synchronous belt, a first driving synchronous wheel driven by the traction driving source to rotate, and a first driven synchronous wheel arranged to rotate coaxially with the traction driving wheel. At least two groups of heat sealing mechanisms are arranged in sequence along the material transporting direction. The discharge end of the transition traction mechanism is connected between any two adjacent groups of heat sealing mechanisms.

2. The vacuum sealer according to claim 1, wherein: Both the second belt transmission assembly and the third belt transmission assembly include a belt pressing assembly for pressing the transmission belt to seal the bag mouth. The belt pressing assembly includes an upper belt pressing part and a lower belt pressing part. Both the upper belt pressing part and the lower belt pressing part include mounting brackets connected to the frame, and a plurality of belt pressing wheels for fitting with the transmission belt are arranged on the mounting brackets.

3. A vacuum sealer according to claim 1 or 2, characterized in that: The air suction mechanism further includes a slide rail disposed on one side of the transition traction mechanism. The slide rail is arranged along the material transporting direction. An exit assembly for controlling the air suction pipe to withdraw from the second material passing gap is arranged on the slide rail. The exit assembly includes a first rodless cylinder. The first rodless cylinder includes a first cylinder bracket. The first cylinder bracket is connected to the slide rail. A first guide rail is arranged on the first cylinder bracket. The first guide rail is arranged at an angle with the material transporting direction. A first cylinder slider is slidably arranged on the first guide rail. The air suction pipe is installed on the first cylinder slider.

4. A vacuum sealer according to claim 3, characterized in that: A reset component for pushing the air extraction pipe to move back to the original position of the slide rail is provided on one side of the slide rail. The reset component includes a second rodless cylinder, and the second rodless cylinder includes a second cylinder bracket installed on the frame. A second guide rail is provided on the second cylinder bracket, and the second guide rail is arranged parallel to the material transportation direction. A second cylinder slider capable of pushing the ejection component to move is slidably provided on the second guide rail.

5. A vacuum sealer according to claim 3, characterized in that: A sealing insert is provided on the side of the air extraction pipe away from the heat sealing mechanism.

6. A vacuum sealer according to claim 1 or 2, characterized in that: The heat sealing and traction mechanism includes a first conveyor belt assembly arranged vertically, and the first material passing gap is arranged between the upper and lower first conveyor belt assemblies; the first conveyor belt assembly includes a first conveyor belt, a feeding driving wheel, and a feeding driven wheel; the feeding driving wheel is linked with the traction driving source through a second synchronous belt assembly; the second synchronous belt assembly includes a second synchronous belt, a second driving synchronous wheel driven by the traction driving source to rotate, and a second driven synchronous wheel arranged to rotate coaxially with the feeding driving wheel; the material transportation device includes a conveyor belt, a conveying driving roller, and a conveying driven roller. One end of the conveying driving roller is connected with a transmission component, the transmission component is connected with a driving wheel, and the driving wheel is linked with the feeding driving wheel through a third synchronous belt assembly; the third synchronous belt assembly includes a third synchronous belt, a third driving synchronous wheel arranged to rotate coaxially with the feeding driving wheel, and a third driven synchronous wheel arranged to rotate coaxially with the driving wheel.

7. A vacuum sealer according to claim 6, characterized in that: The transmission component includes a first universal joint connected to one end of the conveying driving roller. The first universal joint is connected with a transmission rod, and the other end of the transmission rod is connected with a second universal joint, and the second universal joint is connected with the driving wheel.

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