CN111879475A

CN111879475A - Food package gas tightness detection device based on block chain technique

Info

Publication number: CN111879475A
Application number: CN202010774762.2A
Authority: CN
Inventors: 王国荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2020-11-03

Abstract

The invention discloses a food packaging air tightness detection device based on a block chain technology, which comprises a box body, wherein a water storage tank is arranged at the bottom in the box body, a water tank is fixedly arranged at the bottom of the water storage tank, a water pump is arranged in the water tank, a test slot is arranged at the middle part of the box body, a baffle and a water hole are arranged in the test slot, a squeezing net is arranged in the water hole, an air bubble collection device is arranged above the water hole, the air bubble collection device comprises an air collection tank, a conical cylinder is arranged at the upper part of the air collection tank, a detection switch is arranged at the top of each conical cylinder and comprises a positive electrode and a negative electrode, and a sealing cover is detachably arranged above the box body. The detection effect on the food packaging bag with trace air leakage is not good.

Description

Food package gas tightness detection device based on block chain technique

Technical Field

The invention relates to the technical field of air tightness detection, in particular to a food packaging air tightness detection device based on a block chain technology.

Background

The food packaging bag is a packaging bag which takes plastic as a raw material and is used for producing various articles in daily life, and is widely used in daily life and industrial production. The food packaging bags can be divided into two categories according to the application, namely, the food packaging bags can be classified into domestic food packaging bags and industrial food packaging bags, and the sealing rate of the food packaging bags needs to be fully noticed during production, so that the quality of the food packaging bags is guaranteed.

The block chain is a shared database, data or information stored in the block chain has the characteristics of 'unforgeability', 'whole-course trace', 'traceability', 'public transparency', 'collective maintenance' and the like, the block chain technology lays a solid 'trust' foundation, a reliable 'cooperation' mechanism is created, and the food packaging airtightness detection is slowly applied to the block chain technology.

The food packaging bag air tightness detection device based on the block chain technology solves the problems that the existing food packaging bag air tightness detection device based on the block chain technology is complex in structure, inconvenient to simultaneously test a plurality of sealed food bags and poor in detection effect of food packaging bags with trace air leakage, and the food packaging bag air tightness detection device based on the block chain technology can greatly shorten the service life of products if air leakage occurs after the food packaging bags are sealed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a food packaging airtightness detection device based on a block chain technology, and the specific technical scheme is as follows:

a food packaging air tightness detection device based on a block chain technology comprises a box body, wherein a water storage tank is arranged at the bottom in the box body, a water tank is fixedly arranged at the bottom of the water storage tank, a water pump is arranged in the water tank and fixedly connected with a water outlet through a water pipe, the water outlet is fixedly arranged at the top of the water tank, holes are respectively formed in two sides of the water tank, a test groove is formed in the middle of the box body, a baffle is arranged in the test groove, a plurality of water holes are formed in the baffle at equal intervals, an extrusion net is arranged in each water hole, a bubble collection device is arranged above each water hole and comprises a gas collection tank, a plurality of through holes are formed in the side wall of the lower portion of each gas collection tank, a conical cylinder is arranged at the upper portion of each conical cylinder, a detection switch is arranged, the detection switch comprises an anode electrode and a cathode electrode, an insulating block is arranged between the anode electrode and the cathode electrode, a sealing cover is detachably arranged above the box body, an one-way air valve is arranged at the top of the sealing cover, a liquid level switch is arranged on one side of the one-way air valve, a switch door is arranged on the front surface of the box body in a rotating and sealing manner, a plurality of storage racks which are mutually separated and correspond to the water holes one by one are arranged in the detection groove, food bags are placed on the storage racks, the switch door and the box body are made of transparent materials, the water pump is electrically connected with the controller, the controller is connected with the block chain module, the controller starts the water pump to rotate positively to pump water in the water storage groove to enter the detection groove, the food bags in the detection groove float to the extrusion net in the water holes, the water level rises to the height of the test switch, an electric signal is transmitted into a controller, the controller increases the rotation speed of the water pump, ascending water flow and the extrusion net further extrude a food bag, air leakage of the food bag forms bubbles and enters the conical barrel through the water holes, the bubbles are gathered in the conical barrel and are discharged out of water in the conical barrel, so that the anode electrode and the cathode electrode are disconnected, the controller displays the corresponding detection switch serial number and sends out an air leakage warning, the water level rises to the height of the liquid level switch, and air in the test groove is discharged from the one-way air valve; and in a specified time interval, the controller starts the water pump to reversely pump the water in the test slot back into the water storage tank, negative pressure is formed in the test slot, and the food bag is dehydrated.

Preferably, two the holes and all install the filter screen in the water outlet.

Preferably, box top both sides are the fixed telescopic link that is provided with respectively, two the telescopic link is flexible to be held the inner wall and all is fixed to be provided with locating piece one, two the fixed diaphragm that is provided with between locating piece one, the diaphragm bottom is fixed to be provided with the sealed cowling, the diaphragm top is through a plurality of connecting block fixedly connected with horizontal pole, the horizontal pole both ends slide the setting about respectively and are inboard at two risers, the position of horizontal pole can be fixed, two the riser is fixed the setting on locating piece two respectively, locating piece two is fixed to be set up telescopic link stiff end lateral wall.

Preferably, the horizontal pole both ends are the fixed slider that is provided with respectively, two the slider sets up respectively in two spouts, the slider with spout sliding fit, two the spout is vertically seted up respectively two the riser is inboard, the slider inboard is provided with the elasticity screw rod, the elasticity screw rod with slider screw-thread fit, the slider is through screwing the elasticity screw rod supports fixedly.

Preferably, the box top has been seted up ring groove, the sealed cowling with the ring groove joint, the bottom is fixed to be provided with annular sealing pad in the ring groove.

Preferably, the height of the one-way air valve is higher than that of the liquid level switch, and the one-way air valve is connected with the transverse plate through threads.

Preferably, the diameter of the water hole is equal to that of the gas collecting tank, and the diameter of the water hole is equal to that of the commodity shelf.

Compared with the prior art, the invention has the beneficial effects that:

1. through the structures of the shelf, the water hole, the bubble collecting device, the detection switch and the like, a plurality of food packaging bags are placed on the shelf, then the switch door is closed, the controller controls the water pump to work, water in the water storage tank enters the test groove from the water outlet and drives the food bags to float to the water hole, bubbles formed by gas leaked from the food bags can be collected into the gas collecting tank after the water level is higher than a through hole on the gas collecting tank, in order to further collect the bubbles, the problem that a part of the food bags are slightly leaked and can not form bubbles is solved, when the water level reaches the height of the detection switch, the positive electrode and the negative electrode of the detection switch are conducted, the controller receives a conduction signal of the detection switch, controls the water pump to increase the rotating speed, the rising water flow is accelerated to further extrude the food bags onto the extrusion net, and the gas in the leaked food bags is extruded and collected into the gas collecting tank under the combined action of the buoyancy, the, the gas in the gas collecting tank is discharged out of the water at the top of the gas collecting tank, so that the anode electrode and the cathode electrode of the detection switch are disconnected, the detection signal is transmitted into the controller, and the controller displays the serial number of the detection switch and gives an alarm to indicate that the food bag below the detection switch corresponds to gas leakage. The inconvenient problem that detects of food bag of trace gas leakage has been solved to the combined action of above-mentioned structure on the one hand, and on the other hand detects the gas leakage process and does not need artifical the detection, can realize automated inspection and report to the police, liberates the manpower, improves work efficiency.

2. Meanwhile, a plurality of storage racks, water holes and corresponding bubble collecting devices are arranged, so that a plurality of food bags can be detected at the same time, and the working efficiency is improved; meanwhile, each food bag corresponds to a corresponding detection switch and can correspond to the serial number of the detection switch on the controller one by one, so that the detection result of each food bag can be accurately displayed, and the problems that the existing food packaging bag air tightness detection device is complex in structure and inconvenient to test a plurality of sealed food bags at the same time are solved;

3. after the gas leakage condition of the food bag is detected, the water pump is rotated reversely to pump the water in the test slot back to the water storage tank, air in the test slot is discharged from the one-way air valve due to water in the test process, and after the water in the test slot is pumped to the water storage tank by the water pump, negative pressure is formed in the test slot, so that negative pressure dehydration can be performed on the food bag on the object rack, a special dehydration facility is not needed, the structure of the whole device is simplified, the cost is low, the effect is good, and the operation is simple.

4. Through the arrangement of the telescopic rod, the sealing cover, the annular sealing gasket and other structures, the transverse rod is moved downwards, the transverse rod drives the sealing cover to move downwards, and the position of the sealing cover can be fixed by screwing the elastic screw rod, so that the sealing cover is convenient to mount, and meanwhile, the residual trivial details in the test groove during detection are convenient to clean; through the annular clamping groove and the annular sealing gasket and other structures, the sealing cover is abutted against the annular sealing gasket, and the sealing performance of the sealing cover is guaranteed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a perspective view of a food package airtightness detection apparatus based on the block chain technology according to the present invention;

fig. 2 is a front view of a food package airtightness detection apparatus based on the block chain technology according to the present invention;

fig. 3 is a cross-sectional view of a food package airtightness detection apparatus based on the block chain technology according to the present invention;

fig. 4 is a cross-sectional view of a water tank in a food package airtightness detection apparatus based on the block chain technology according to the present invention;

FIG. 5 is an enlarged view of section A of FIG. 3 of the present invention;

FIG. 6 is an enlarged view of portion B of FIG. 3 illustrating the present invention;

in the figure: 1-connecting block, 2-cross bar, 3-elastic screw, 4-vertical plate, 5-sliding block, 6-sliding groove, 7-positioning block I, 8-telescopic bar, 9-positioning block II, 10-detection switch, 11-transverse plate, 12-sealing cover, 13-annular clamping groove, 14-annular sealing gasket, 15-box body, 16-baffle, 17-food bag, 18-opening and closing door, 19-water storage tank, 20-testing groove, 21-water hole, 22-bubble collecting device, 23-gas collecting tank, 24-through hole, 25-water tank, 26-water outlet, 27-hole, 28-filter screen, 29-water pipe, 30-water pump, 31-conical cylinder, 32-positive electrode, 33-negative electrode, 34-one-way air valve, 35-liquid level switch, 36-shelf, 37-extrusion net, 38-electromagnetic valve, 39-insulating block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a food package airtightness detection device based on block chain technology comprises a box body 15, a water storage tank 19 is arranged at the bottom in the box body 15, a water tank 25 is fixedly arranged at the bottom of the water storage tank 19, a water pump 30 is arranged in the water tank 25, the water pump 30 is fixedly connected with a water outlet 26 through a water pipe 29, an electromagnetic valve 38 is arranged on the water pipe 29, the water outlet 26 is fixedly arranged at the top of the water tank 25, holes 27 are respectively arranged at two sides of the water tank 25, filter screens 28 are respectively arranged in the two holes 27 and the water outlet 26, water inlet and outlet of the water pump 30 can be effectively filtered, and the water.

The middle part of the box body 15 is provided with a test slot 20, the test slot 20 is internally provided with a baffle 16, the baffle 16 is equidistantly provided with a plurality of water holes 21, the water holes are internally provided with an extrusion net 37, and the extrusion net 37 has the following functions: on one hand, the squeezing net 37 can prevent the aerated food bag 17 from floating to the air collecting tank 23 through the water hole 21 to influence the detection result, on the other hand, the pressure of water on the aerated food bag 17 and the counter-acting squeezing pressure of the squeezing net 37 can promote the air exhaust of the air-leaking food bag 17 to form air bubbles, so that the air bubble collecting device 22 can collect more air bubbles, the accuracy of the detection result of the detection switch 10 is improved, the problem of low detection accuracy caused by slow air leakage of the micro air-leaking food bag 17 is prevented, meanwhile, the air exhaust of the micro air-leaking food bag 17 is further promoted, after the water level reaches the position of the detection switch 10 and acts, the controller enables the water pump 30 to increase the rotating speed, the water outlet speed and the water outlet pressure of the water pump 30 are increased, and the squeezing net 37 is further matched to squeeze the air-leaking food bag; the extrusion net 37 and the bubble collecting device 22 are mutually associated, so that the problem of low detection accuracy rate of the food bag 17 with trace air leakage due to slow air leakage is solved, and the detection effect of the whole device is improved.

The bubble collecting device 22 is arranged above the water hole 21 and used for collecting bubbles generated after the air-leaking food bag 17 is extruded, the bubble collecting device 22 comprises an air collecting tank 23, the side wall of the lower part of the air collecting tank 23 is provided with a plurality of through holes 24, the through holes 24 are arranged so that water in the test groove 20 can smoothly reach the space above the baffle 16 to submerge the detection switch 10, the upper part of the air collecting tank 23 is provided with a conical cylinder 31 and used for collecting and storing the bubbles, and when the water level is higher than the through holes 24, all the bubbles can enter the conical cylinder 31 so as to discharge the water in the conical cylinder 31 to create a condition for disconnecting the anode electrode 32 and the cathode electrode 33; the diameter of water hole 21 equals the diameter of gas collecting tank 23, and the diameter of water hole 21 equals the width of supporter 36, and above-mentioned setting can make the food bag 17 of gas leakage not blockked by the bubble that produces after being extruded, arrives in gas collecting tank 23 smoothly, improves the efficient of gas collecting tank 23 collection bubble, improves the accuracy of testing result. The top of each conical barrel 31 is provided with a detection switch 10 and is in one-to-one correspondence with the detection switch serial number injected in the controller, so that after the detection switch 10 acts, the controller receives a signal to distinguish the detection switch 10 which acts in a specific way, and the position of the corresponding air leakage food bag 17 can be conveniently judged; the detection switch comprises a positive electrode 32 and a negative electrode 33, an insulating block 39 is arranged between the positive electrode 32 and the negative electrode 33, the positive electrode 32 and the negative electrode 33 are submerged in water, the two electrodes are conducted, otherwise, the two electrodes are disconnected; the power supply voltage of the anode electrode 32 and the cathode electrode 33 adopts safe voltage to prevent harm to human body;

the sealing cover 12 is detachably arranged above the box body 15, the top of the sealing cover 12 is provided with the one-way air valve 34, after water in the water storage tank 19 enters the test tank 20, air in the test tank 20 is discharged through the one-way air valve 34, after the air tightness is detected, and after the water in the test tank 20 is pumped back to the water storage tank 19, negative pressure is formed in the test tank 20, so that conditions are created for dewatering the food bag 17. One side of the one-way air valve 34 is provided with a liquid level switch 35 for detecting the water level in the test slot 20, when the water level reaches the height of the liquid level switch 35, air in the test slot 20 is fully discharged through the one-way air valve 34, the liquid level switch 35 acts at the moment, the controller closes the electromagnetic valve 38 and stops the water pump 30 to work, the test slot 20 is filled with water, the water pressure and the extrusion net 37 continuously extrude the food bags 17, and the food bags 17 with air leakage are promoted to continuously exhaust. The height of the one-way air valve 34 is higher than that of the liquid level switch 35, so that water is prevented from being discharged from the one-way air valve 34, the one-way air valve 34 is connected with the transverse plate 11 through threads, the one-way air valve 34 can be screwed off after a test is finished, external air enters the test slot 20, and the sealing cover 12 is prevented from being opened due to negative pressure in the test slot 20.

Box 15 openly rotary seal is provided with switch door 18, test groove 20 is equipped with a plurality of mutual divisions and with the supporter 36 of 21 one-to-one in the water hole, food bag 17 has been placed to supporter 36, switch door 18 and box 15 all adopt transparent material to make, water pump 30 is connected with the controller electricity, the controller is connected with block chain module, the controller can water pump working data, pass into block chain module on the detection switch action data lamp, a remote control for the device, gas tightness nonconforming rate statistics etc.

As an improvement of the technical scheme, telescopic rods 8 are respectively and fixedly arranged on two sides of the top of a box body 15, positioning blocks I7 are respectively and fixedly arranged on the inner walls of the telescopic ends of the two telescopic rods 8, a transverse plate 11 is fixedly arranged between the two positioning blocks I7, a sealing cover 12 is fixedly arranged at the bottom of the transverse plate 11, a transverse rod 2 is fixedly connected to the top of the transverse plate 11 through a plurality of connecting blocks 1, two ends of the transverse rod 2 are respectively and vertically arranged on the inner sides of two vertical plates 4 in a sliding manner, the position of the transverse rod 2 can be fixed, the two vertical plates 4 are respectively and fixedly arranged on a positioning block II 9, the positioning block II 9 is fixedly arranged on the side wall of the fixed end of the telescopic rod 8, slide blocks 5 are respectively and fixedly arranged at two ends of the transverse rod 2, the two slide blocks 5 are,

elasticity screw rod

3 and 5 screw-thread fit of slider, slider 5 support fixedly through the elasticity screw rod 3 of screwing, and ring groove 13 has been seted up at box 15 top, and sealed cowling 12 and ring groove 13 joint, the bottom is fixed in the ring groove 13 is provided with annular sealing pad 14.

Through the arrangement of the telescopic rod 8, the sealing cover 12, the annular sealing gasket 14 and other structures, the transverse rod 2 is moved downwards, the transverse rod 2 drives the transverse plate 11 to move downwards, the transverse plate 11 drives the sealing cover 12 to move downwards, the position of the sealing cover 12 can be fixed by screwing the elastic screw 3, the sealing cover 12 is convenient to mount, and the sealing cover 12 is moved upwards, so that the residual trivial details in the test slot 20 can be conveniently cleaned; through the ring groove 13 and the ring-shaped sealing gasket 14 and other structures, the sealing cover 12 is abutted to the ring-shaped sealing gasket 14, and the sealing performance of the sealing cover 12 is guaranteed.

When the device is used, the switch door 18 is opened, the storage rack 36 is pulled out and a food bag 17 to be detected is put in the storage rack, the storage rack 36 is pushed and the switch door 18 is closed, the controller is operated to start the water pump 30 to rotate positively to pump water in the water storage tank 19 into the test slot 20, the food bag 17 in the test slot 20 floats upwards to the extrusion net 37 in the water hole 21, the water level rises to the height of the test switch, the positive electrode 32 and the negative electrode 33 are conducted, an electric signal is transmitted into the controller, the controller increases the rotation speed of the water pump 30, the rising water flow and the extrusion net 37 further extrude the food bag 17, air leakage of the food bag 17 forms air bubbles and enters the conical barrel 31 through the water hole 21, the air bubbles are gathered in the conical barrel 31 and are discharged out of the water in the conical barrel 31 to disconnect the positive electrode 32 and the negative electrode 33, the controller displays the corresponding detection switch serial number and sends out an air leakage, the electromagnetic valve 38 is closed, the controller stops the water pump 30, and the air in the test slot 20 is exhausted from the one-way air valve 34; and in a designated time period, the controller starts the water pump 30 to reversely rotate to pump the water in the test slot 20 back to the water storage slot 19, negative pressure is formed in the test slot 20, and the food bag 17 is dehydrated. When the sealing cover 12 needs to be opened, the cross rod 2 is moved downwards, the cross rod 2 drives the cross plate 11 to move downwards, the cross plate 11 drives the sealing cover 12 to move downwards, the position of the sealing cover 12 can be fixed by screwing the elastic screw 3, the sealing cover 12 is convenient to mount, and the sealing cover 12 is moved upwards, so that the residual trivial details in the test slot 20 can be conveniently cleaned; through the ring groove 13 and the ring-shaped sealing gasket 14 and other structures, the sealing cover 12 is abutted to the ring-shaped sealing gasket 14, and the sealing performance of the sealing cover 12 is guaranteed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The food packaging airtightness detection device based on the block chain technology comprises a box body (15) and is characterized in that a water storage tank (19) is arranged at the bottom in the box body (15), a water tank (25) is fixedly arranged at the bottom of the water storage tank (19), a water pump (30) is arranged in the water tank (25), the water pump (30) is fixedly connected with a water outlet (26) through a water pipe (29), an electromagnetic valve (38) is arranged on the water pipe (29), the water outlet (26) is fixedly arranged at the top of the water tank (25), holes (27) are respectively formed in two sides of the water tank (25),

the testing device is characterized in that a testing groove (20) is formed in the middle of the box body (15), a baffle (16) is arranged in the testing groove (20), a plurality of water holes (21) are formed in the baffle (16) at equal intervals, a squeezing net (37) is arranged in each water hole, a bubble collecting device (22) is arranged above each water hole (21), each bubble collecting device (22) comprises a gas collecting tank (23), a plurality of through holes (24) are formed in the side wall of the lower portion of each gas collecting tank (23), conical cylinders (31) are arranged on the upper portions of the gas collecting tanks (23), a detection switch (10) is arranged at the top of each conical cylinder (31) and corresponds to detection switch serial numbers injected in a controller one-to-one, each detection switch (10) comprises a positive electrode (32) and a negative electrode (33), and an insulating block (39) is arranged between each positive electrode (,

the food bag testing device is characterized in that a sealing cover (12) is detachably arranged above the box body (15), an one-way air valve (34) is arranged at the top of the sealing cover (12), a liquid level switch (35) is arranged on one side of the one-way air valve (34), a switch door (18) is arranged on the front surface of the box body (15) in a rotating and sealing manner, a plurality of storage racks (36) which are mutually separated and correspond to the water holes (21) one by one are arranged in the test groove (20), food bags (17) are placed on the storage racks (36), the switch door (18) and the box body (15) are made of transparent materials, the water pump (30) is electrically connected with the controller, and the controller,

the controller starts the water pump (30) to rotate positively to extract water in the water storage tank (19) to enter the test slot (20), a food bag (17) in the test slot (20) floats to the position of a squeezing net (37) in the water hole (21), the water level rises to the height of the detection switch (10), the positive electrode (32) and the negative electrode (33) are conducted, an electric signal is transmitted into the controller, the controller increases the rotating speed of the water pump (30), rising water flow and the squeezing net (37) further squeeze the food bag (17), the food bag (17) leaks air to form bubbles and enters the conical barrel (31) through the water hole (21), the bubbles are gathered in the conical barrel (31) and discharged out of the water in the conical barrel (31) to disconnect the positive electrode (32) and the negative electrode (33), the controller displays the corresponding detection switch serial number and gives out an alarm, the water level rises to the height of the liquid level switch (35), the electromagnetic valve (38) is closed, the controller stops the water pump (30) from working, and the air in the test slot (20) is exhausted from the one-way air valve (34); and in a designated time interval, the controller starts the water pump (30) to reversely rotate to pump the water in the test slot (20) back to the water storage tank (19), negative pressure is formed in the test slot (20), and the food bag (17) is dehydrated.

2. The device for detecting the air tightness of food packages based on the block chain technology as claimed in claim 1, wherein: and filter screens (28) are respectively arranged in the two holes (27) and the water outlet (26).

3. The device for detecting the air tightness of food packages based on the block chain technology as claimed in claim 1, wherein: box (15) top both sides are fixed respectively and are provided with telescopic link (8), two telescopic link (8) flexible end inner wall is the fixed locating piece (7) that is provided with, two fixed diaphragm (11) that is provided with between locating piece (7), fixed being provided with in diaphragm (11) bottom sealed cowling (12), diaphragm (11) top is through a plurality of connecting block (1) fixedly connected with horizontal pole (2), slide setting about respectively in two riser (4) inboards at horizontal pole (2) both ends, the position of horizontal pole (2) can be fixed, two riser (4) are fixed respectively and are set up on locating piece two (9), locating piece two (9) are fixed and are set up telescopic link (8) stiff end lateral wall.

4. The device for detecting the air tightness of food packages based on the block chain technology as claimed in claim 3, wherein: horizontal pole (2) both ends are fixed respectively and are provided with slider (5), two slider (5) set up respectively in two spout (6), slider (5) with spout (6) sliding fit, two spout (6) are vertically seted up respectively two riser (4) are inboard, slider (5) inboard is provided with elasticity screw rod (3), elasticity screw rod (3) with slider (5) screw-thread fit, slider (5) are through screwing elasticity screw rod (3) support fixedly.

5. The device for detecting the air tightness of food packages based on the block chain technology as claimed in claim 1, wherein: annular groove (13) have been seted up at box (15) top, sealed cowling (12) with annular groove (13) joint, annular groove (13) bottom is fixed and is provided with annular sealing pad (14).

6. The device for detecting the air tightness of food packages based on the block chain technology as claimed in claim 1, wherein: the height of the one-way air valve (34) is higher than that of the liquid level switch (35), and the one-way air valve (34) is connected with the transverse plate (11) through threads.

7. The device for detecting the air tightness of food packages based on the block chain technology as claimed in claim 1, wherein: the diameter of the water hole (21) is equal to that of the gas collecting tank (23), and the diameter of the water hole (21) is equal to that of the commodity shelf (36).