Patent Publication Number: US-2023141249-A1

Title: Automatic pressing power device of vacuum packaging machine

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit and priority of Chinese patent application No. 202122762852.2, filed on Nov. 11, 2021, disclosure of which is hereby incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     The invention relates to the technical field of vacuum packaging machines, in particular to an automatic pressing power device with an air bag of a vacuum packaging machine. 
     BACKGROUND 
     In the prior art, the vacuum packaging machine has the functions of automatic vacuum pumping, automatic sealing and the like. Generally, the driving locking device of the upper gland and main body is set in the middle of the vacuum packaging machine body, so that the maximum locking force is concentrated in the middle of the vacuum packaging machine body, while the locking force at the edge of the upper gland and main body is relatively weak in the middle of the vacuum packaging machine. Because the sealing device and vacuum chamber are arranged at one edge of the vacuum packaging machine, the locking force between the upper gland and main body on the side where the sealing device and vacuum chamber are located is weak, and the tight force between the upper gland and main body is not enough, which leads to two problems easily. Firstly, during heat sealing, the sealing effect is poor because the edge pressing force of the upper gland and main body is not enough, and the top sticking force of the vacuum packaging bag to the hot melt device is not enough. Especially when there is liquid at the mouth of the vacuum packaging bag, due to the poor fit between the heating wire and the vacuum packaging bag, the heat energy of the heating wire can not be normally transmitted to the vacuum packaging bag, resulting in intermittent sealing of the vacuum packaging bag and even air leakage of the vacuum packaging bag. Secondly, air leakage is easy to occur when vacuuming, resulting in poor vacuuming effect and long vacuuming time. 
     Existing vacuum packaging machines usually use hinge twisted upper flip design. When using, the user needs to turn up the upper flip cover, place the vacuum packaging bag mouth in the lower half vacuum chamber of the vacuum packaging machine main body, and then close and press the upper flip cover to enter the working mode. This structure has the following defects, which are easy to cause operation errors and lead to vacuum pumping failure. 1. The user needs to accurately place the mouth of the vacuum packaging bag in the vacuum chamber, otherwise the vacuumizing operation will not be completed. 2. The user did not completely close the upper flip cover, resulting in the lower and upper half vacuum chambers of the vacuum packaging machine not fully attached and leaking air, thus failing to complete the vacuumizing operation. After-sales of the above non-product quality problems caused by improper operation will cause huge after-sales pressure and losses to manufacturers and merchants, and cause inconvenience to users. 
     SUMMARY 
     The technical problem to be solved by the invention is to provide an automatic pressing power device with an air bag of a vacuum packaging machine. 
     The invention is realized by the following technical proposal: 
     A automatic pressing power device of a vacuum packaging machine, the automatic pressing power device comprising main body, power plate and power airbag, the power plate being connected with the main body through the power airbag and forming a telescopic closed cavity; The bottom of the main body is provided with an air nozzle communicated with the closed cavity. 
     Further, pressure plate is arranged under the automatic pressing power device and the power plate; the power airbag is annular, and the annular inner side of the power airbag is pressed and fixed by the power plate and the pressure plate. 
     Further, the annular outer sides of the automatic pressing power device and the power airbag are pressed and fixed by the main body and pressure ring. 
     Further, in the automatic pressing power device, the closed cavity, the inside of the pressure plate is provided with first component, the inside of the main body is provided with second component, the first component and the second component are socked with each other and are provided with first return spring, one end of the first return spring is abutted at the inside of the pressure plate, and the other end is abutted at the inside of the main body to form first telescopic mechanism. 
     Further, the automatic pressing power device, the first component are guide groove, the second component is guide post, and the guide groove is sleeved with the guide post to form the first telescopic mechanism. 
     Further, a plurality of first telescopic mechanism is arranged in the automatic pressing power device and the closed cavity. 
     Further, the automatic pressing power device and the power plate are provided with limiting column, and the limiting column is plugged into the limiting hole provided with the main body; second return spring is sleeved on the limiting column, one end of which is abutted at the main body, and the other end is abutted at the limiting screw fixed at the bottom of the limiting column to form second telescopic mechanism. 
     Further, a plurality of second telescopic mechanism is arranged outside the automatic pressing power device and the closed cavity. 
     Further, the edges of the automatic pressing power device and the pressure plate are provided with upward folding, and the annular inner side of the power airbag is fixed between the power plate and the upward folding. 
     Further, the edges of the automatic pressing power device and the main body are provided with groove, and the annular outer side of the power airbag is fixed between the pressure plate and the inside wall of groove. 
     The advantages and effects of the invention are: 
     1. The vacuum packing machine with automatic pressing power device provided by the invention does not need to tighten upper cover manually. After the vacuum packaging machine is started, vacuumize closed cavity, upper cover will be pulled down by power airbag, and the upper and lower vacuum grooves will be tightly attached and clamped to the vacuum bag, thus reducing the error prevention probability of users, thus reducing the after-sales cost and pressure of manufacturers and merchants. 
     2. The first telescopic mechanism in the automatic pressing power device provided by the invention ensures that the power plate drives the upper cover to move up and down without being disturbed by external force and deviating from the proper position, and accurately sticks the upper and lower vacuum grooves and clamps the vacuum bag. 
     3. The automatic pressing power device provided by the invention has the characteristics of simple structure, low cost, high structural stability, long service life and the like. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    shows the structural schematic diagram of automatic pressing power device of embodiment 1 provided by the invention; 
         FIG.  2    shows the application schematic diagram of automatic pressing power device of embodiment 1 provided by the invention; 
         FIG.  3    shows the split schematic diagram of  FIG.  2   ; 
         FIG.  4    shows the structural schematic diagram of automatic pressing power device of embodiment 4 provided by the invention; 
         FIG.  5    shows the application schematic diagram of automatic pressing power device of embodiment 2 provided by the invention; 
         FIG.  6    shows the split schematic diagram of  FIG.  5   ; 
     
    
    
       1 —main body,  11 —air nozzle,  12 —guide post,  13 —groove ,  14 —inside wall of groove,  15 —limiting hole,  2 —power plate,  3 —pressure plate,  31 —guide groove,  32 —upward folding,  33 —limiting column,  4 —power airbag,  5 —closed cavity,  6 —pressure ring,  7 —first return spring,  8 —second return spring,  9 —limiting screw,  10 —first telescopic mechanism,  20 —second telescopic mechanism,  30 —upper cover. 
     DETAILED DESCRIPTION 
     In order to make the purpose, technical proposal and advantages of the invention more clear, the technical proposal in the embodiment of the invention will be described in more detail in conjunction with the figures in the embodiment of the invention. The described embodiments are part of, and not all of, the embodiments of the invention. The embodiments described below by reference to the accompanying figures are exemplary and are intended to be used for explanation of the invention and are not to be construed as limiting. Based on the embodiments in the invention, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the invention. Embodiments of the invention are described in detail below with reference to the accompanying figures: 
     In the description of the invention it is to be understood that “multiple” means two or more unless otherwise stated; The term “center”, “Vertical”, “Horizontal”, “Before”, “After”, “Left”, “Right”, “Vertical”, “Level”, “Top”, “Bottom”, “inside”, “outside” and the like are indicative of orientations or positional relationships based on those shown in the figures and are intended for ease of description and simplification of the description only, and are not intended to indicate or imply that the device or element in question must have a particular orientation, be constructed and operate in a particular orientation and therefore cannot be construed as limiting the scope of the invention. Further, the terms “first”, “second”, etc. are used for descriptive purposes only and cannot be understood to indicate or imply relative importance. In the description of the invention, it should also be noted that the terms “mounted”, “connected” and “connected” are understood broadly, for example, to be fixed, detachable, or integrally connected, unless otherwise expressly specified and limited; It can be directly connected or indirectly connected through an intermediary. The specific meanings of the above terms in the invention will be understood on a case-by-case basis to those of ordinary skill in the art. 
     Embodiment 1 
       FIG.  1    shows the structural schematic diagram of automatic pressing power device of embodiment 1 provided by the invention; the automatic pressing power device comprises main body  1 , power plate  2  and power airbag  4 . Power plate  2  and main body  1  are connected by power airbag  4 . Because power airbag  4  is made of soft materials such as rubber or silica gel, closed cavity  5  which can be stretched under the influence of external force is formed between power plate  2  and main body  1 . Air nozzle  11  communicated with closed cavity  5  is arranged at the bottom of main body  1 , which is used to inflate or pump closed cavity  5 , so that power plate  2  can form an action of shrinking, lowering or stretching and jacking. The connection mode of pressure plate  3  and power airbag  4 , main body  1  and power airbag  4  is not limited to the fixed seal connection using screws, buckles or glue. The edge of power airbag  4  can, but is not limited to, R-shaped or W-shaped shapes with telescopic characteristics, which is beneficial to reduce the movement resistance of power airbag and power plate upper and lower pistons connected with power airbag. 
     Further, pressure plate  3  is arranged under power plate  2 , and power airbag  4  is annular (as shown in  FIG.  3   ), and its annular inner side is pressed and fixed by power plate  2  and pressure plate  3 . At this point, main body  1 , pressure plate  3 , and power airbag  4  form closed cavity  5 . It can be understood that pressure plate  3  is a part of power plate  2 , or power plate  2  and pressure plate  3  forms a clamping mechanism to fix the annular inner side of power airbag  4 . The bottom of power plate  2  and the top of pressure plate  3  are provided with connecting parts that restrict each other, or are restricted by a third connecting part (such as screws, buckles or glue, etc.), so that power plate  2  and pressure plate  3  can clamp and fix the annular inner side of power airbag  4 . Specifically, in one embodiment, the bottom of power plate  2  is provided with a groove which can be embedded into the top of pressure plate  3 , and the outer diameter of the groove is equivalent to the inner diameter of the groove, which squeezes each other to generate a large friction force, so as to ensure that power plate  2  and pressure plate  3  clamp the annular inner side of power airbag  4 . Upward folding  32  is arranged at the edge of pressure plate  3  and the annular inner side of power airbag  4  is fixed between power plate  2  and upward folding  32  to enhance the stability of fixing and clamping. 
     Further, pressure ring  6  is arranged at the joint of the annular outer side of main body  1  and power airbag  4 , and the annular outer side of power airbag  4  is pressed and fixed by main body  1  and pressure ring  6 . It can be understood that pressure ring  6  and main body  1  form another clamping mechanism to fix the annular outer side of power airbag  4 . Main body  1  and pressure ring  6  are provided with connecting parts that restrict each other, or are restricted by a third connecting part (such as screws, buckles or glue, etc.), so that pressure ring  6  and main body  1  can clamp and fix the annular outer side of power airbag  4 . Specifically, in one embodiment, the edge of main body  1  is provided with groove  13 , and the annular outer side of power airbag  4  is fixed between the inner side wall  14  of pressure plate  6  and groove  13 , so as to enhance the stability of fixing and clamping. As shown in  FIG.  3   , the joints between pressure ring  6 , power airbag  4  and main body  1  and the annular outer side of power airbag  4  are all annular, that is, groove  13  is annular, and the annular outer edge of pressure ring  6  is squeezed against the annular outer side wall of groove  13  (the other side opposite to the inner side wall  14 ), generating a large friction force to ensure that main body  1  and pressure ring  6  clamp the annular outer side of power airbag  4 . 
     In closed cavity  5 , first component is arranged inside pressure plate  3 , second component is arranged inside main body  1 , first component and second component are socked with each other, and first return spring  7  is peripheral to form first telescopic mechanism  10 . One end of first return spring  7  abuts on the inside of pressure plate  3  and the other end abuts on the inside of main body  1 . First telescopic mechanism  10  can ensure that power plate moves up and down in the center of closed cavity without being disturbed by external force and deviating from its proper position. As shown in  FIG.  2   , a plurality of first telescopic mechanism  10  are arranged in the closed cavity  5 , and the plurality of first telescopic mechanism  10  are uniformly distributed in the closed cavity  5 , so that each part is uniformly stressed. Specifically, in one embodiment, as shown in  FIG.  1   , first component is guide groove  31 , second component is guide post  12 , guide groove  31  is sleeved with guide post  12 , and peripheral first return spring  7  forms first telescopic mechanism  10 . 
     Embodiment 2 
       FIG.  4    shows the structural schematic diagram of automatic pressing power device of embodiment 4 provided by the invention; In addition to the technical features of embodiment 1, the automatic pressing power device further comprises: Power plate  2  is set with limiting column  33 , which is plugged into limiting hole  13  set with main body  1 . Second return spring  8  is sleeved on limiting column  33 , one end of which is abutted at main body  1 , and the other end is abutted at limiting screw  9  fixed at the bottom of limiting column  33 , forming second telescopic mechanism  20 . As shown in  FIGS.  5  and  6   , a plurality of second telescopic mechanism  20  are arranged outside the closed cavity  5 , and the plurality of second telescopic mechanism  20  are evenly distributed on both sides outside the closed cavity  5 , so that each part is uniformly stressed. First telescopic mechanism  10  in embodiment 2 may not be provided with first return spring, but only first component and second component are socked with each other to ensure that power plate is not disturbed by external force and deviates from its proper position. 
     The automatic pressing power device can be used in two ways: 
     First: When closed cavity is pumped by air nozzle, the air pressure in closed cavity is lower than the atmospheric pressure. Due to the influence of air pressure difference, power airbag shrinks into closed cavity, which makes power plate shrink. In this application mode, first return spring can be set in guide post and guide groove, and after power airbag contracts to closed cavity, the first complex spring will be compressed. When the vacuum packaging machine completes the required work, the control circuit of the vacuum packaging machine controls air nozzle through solenoid valves, etc., so that the air pressure in closed cavity returns to the atmospheric air pressure value. At this time, first return spring pushes power plate to the initial state of first return spring, and the vacuum packaging machine completes one cycle work. 
     Second: When closed cavity is pressurized and inflated by air nozzle, the air pressure in closed cavity is higher than the atmospheric pressure. Due to the influence of air pressure difference, power airbag is lifted and bulged, which pushes power plate to move upward. When power plate rises to a certain height, it is limited to the set height by second telescopic mechanism, and second return spring is compressed to the maximum. When the vacuum packaging machine completes the required work, the control circuit of the vacuum packaging machine controls air nozzle by means of solenoid valve, etc., so that the air pressure in closed cavity returns to the atmospheric air pressure value. At this time, second return spring connects the initial state of power plate to second return spring, and the vacuum packaging machine completes one cycle work. 
     Power plate can be designed for other forms or functions. As shown in  FIGS.  2  and  3   , the power plate can be provided with a locking hook which is convenient for buckling with the upper cover  30 . When the locking hook is locked with the upper cover of the vacuum packaging machine, the upper cover can be linked with the up and down movement of the power plate. As shown in  FIGS.  5  and  6   , the power plate can also be directly equipped with a vacuum sealing heating wire assembly and a ½ vacuum plastic bag sealing cavity to make it move with the activity of power airbag. 
     The vacuum packaging machine comprises a upper cover assembly, a heating unit mounted on a main body, and the automatic pressing power device. The vacuum packaging machine with automatic pressing power device provided by the invention does not need to tighten upper cover manually. In the initial state of the vacuum packaging machine, a set gap between the bottom surface of upper cover and the top surface of main body is maintained. The vacuum bag enters from the gap and is inserted into the vacuum groove, which will be blocked by the bag baffle plate arranged inside the vacuum groove and cannot exceed the vacuum groove. 
     The above embodiments are only used to explain the technical proposal of the invention, and are not used to limit the scope of implementation of the invention. Even if the shape of power airbag is changed, the technology of sinking or lifting power plate by air pressure difference after inflating or inhaling closed cavity as described above, which is provided with an annular hanging edge at the top end of closed cavity with a soft material, should be regarded as the protection scope of the invention. Any equivalent changes and modifications made within the scope of protection of the invention shall be considered to fall within the scope of protection of the invention.