A continuous air tightness detection device for air-filled bagged food packaging

Abstract

The present invention relates to the technical field of food detection, and in particular to a continuous air tightness detection device for air-filled bag food packaging, comprising a water-passing box, a bag-pressing water-passing mechanism and a buoyancy detection mechanism; the bag-pressing water-passing mechanism is arranged in the water-passing box, and is used for pressing the air-filled packaged food into water from one side of the water-passing box and then sending it out from the other side of the water-passing box; the buoyancy detection mechanism is arranged in the water-passing box, and is used for detecting the buoyancy of the air-filled packaged food after being pressed into water. The present application can press the air-filled packaged food into the water-passing box through the bag-pressing water-passing mechanism, so that the buoyancy of each air-filled packaged food can be detected by the buoyancy detection mechanism, so as to facilitate the subsequent screening of the air-filled packaged food with low buoyancy due to leakage, and the detection efficiency is high, and the device can be connected to the air-filled packaged food conveying line for continuous detection.

Description

Technical Field

[0001] The invention relates to the technical field of food detection, in particular to a device for continuously detecting the air tightness of air-filled bagged food packaging. Background Art

[0002] After food production is completed, it generally needs to be packaged in order to protect the food and prevent it from being damaged by external factors during the circulation process from leaving the factory to the hands of consumers. It also has the function of maintaining the stable quality of the food itself. Food packaging methods are diverse, such as bottling, boxing, and bagging, etc.

[0003] Puffed foods such as potato chips generally need to be packaged with air. A single gas or a mixture of two or three gases is filled into the packaging bag so that the food can be preserved for a long time. For air-tight food in air-packed bags, the air tightness of the packaging bag is very important, so it is generally necessary to conduct an air tightness test before leaving the factory. Currently, the air leakage detection of packaging bags on the market is generally done by staff manually pinching and visual observation, which is inefficient and has poor detection results.

[0004] Chinese patent CN112629783B discloses an efficient food packaging bag leakage detection device, including a conveyor belt, two sliding rods are inserted at the top of the top plate, the bottom of the two sliding rods are fixedly connected with a movable plate, a slide groove is provided on the back of the movable plate, two movable rods are inserted at the top of the movable plate, the bottom of the two movable rods are fixedly connected with a pressure plate, the left side of the pressure plate is fixedly connected with a windshield, a driving wheel is provided on the back of the movable plate, and a fixed rod is fixedly connected to the front of the driving wheel. The driving wheel drives the pressure plate to move downward through the fixed rod, the slide groove, the movable plate and the movable rod. After the pressure plate presses the packaging bag, the airtight packaging bag is in a saturated state, which will give the pressure plate an upward support force. At this time, the pressure plate stops moving downward, the buffer spring begins to compress, and the leaking packaging bag begins to leak and deflate after being squeezed by the pressure plate, and the pressure plate will continue to move downward, thereby achieving the effect of detecting whether the packaging bag is leaking.

[0005] The detection efficiency of this detection device is low and it is not possible to continuously detect the air tightness of air-filled bagged food. Summary of the invention

[0006] In view of the above problems, a continuous air tightness detection device for air-filled bagged food packaging is provided, which solves the problem that the existing device cannot continuously and quickly detect the air tightness of air-filled bagged food through a bag pressing water passing mechanism and a buoyancy detection mechanism.

[0007] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0008] A device for continuously detecting the air tightness of air-filled bagged food packaging comprises a water-passing box, a bag-pressing water-passing mechanism and a buoyancy detection mechanism; the bag-pressing water-passing mechanism is arranged in the water-passing box, and is used for pressing the air-filled bagged food into water from one side of the water-passing box and then sending it out from the other side of the water-passing box; the buoyancy detection mechanism is arranged in the water-passing box, and is used for detecting the buoyancy of the air-filled bagged food after being pressed into water.

[0009] Preferably, it also includes a squeezing mechanism, which is arranged in the water transfer tank and is used to squeeze the air-filled bagged food before being pressed into the water.

[0010] Preferably, the water-passing box has a groove, inclined parts arranged on both sides of the groove, and a horizontal part arranged outside the inclined part; the bag pressing water-passing mechanism includes a first square tube, a second square tube, a third tube, a first placement plate, a second placement plate, a pulley, a trapezoidal conveyor belt and a motor; the first square tube is arranged at the upper part of the groove; the second square tube is arranged at the top of the inclined part on the feeding side of the water-passing box, and the third tube is arranged at the top of the inclined part on the discharging side of the water-passing box; the first placement plate and the second placement plate are symmetrically arranged on the first square tube, the second square tube and the third tube; the pulley is rotatably arranged on the opposite sides of the first placement plate and the second placement plate; there are two trapezoidal conveyor belts, and the two trapezoidal conveyor belts are sleeved on the pulleys, the narrow section of the trapezoidal conveyor belt is lower than its wide section, the narrow section of the trapezoidal conveyor belt is located at the top of the groove, and the waist section of the trapezoidal conveyor belt is located at the top of the inclined part; the motor is arranged on the water-passing box, and the motor is synchronously driven and connected with the pulley.

[0011] Preferably, the bottom ends of the first placement plate and the second placement plate extend downward to the bottom of the trapezoidal conveyor belt.

[0012] Preferably, the first placement plate and the second placement plate are slidably arranged on the first square tube, the second square tube and the third tube towards or away from each other; the water-passing mechanism for pressing the bag also includes a first sliding block, a second sliding block and a bidirectional screw; the first sliding block and the second sliding block are slidably arranged on the third tube towards or away from each other, the upper part of the second sliding block is fixedly connected to the first placement plate, and the upper part of the first sliding block is fixedly connected to the second placement plate; the bidirectional screw is rotatably arranged in the third tube, and the first sliding block and the second sliding block are threadedly connected to the bidirectional screw.

[0013] Preferably, the bag pressing and water passing mechanism also includes a spline shaft, which is rotatably arranged on the water passing box, and the spline shaft coaxially passes through the pulleys on the first mounting plate and the second mounting plate, and the spline shaft and the pulley are slidably engaged; the output shaft of the motor is coaxially fixedly connected to the spline shaft.

[0014] Preferably, the buoyancy detection mechanism includes a supported plate, an arch, a first fixing pin and a distance sensor; the supported plate is horizontally arranged between two trapezoidal conveyor belts, and the supported plate is provided with a first guide plate bent upward along both sides of the bag pressing and water passing mechanism; the arch is fixedly arranged at the top of the supported plate; the first fixing pin is fixedly arranged at the top of the arch, and the first fixing pin penetrates the first square tube in the vertical direction and slidably cooperates with the first square tube; the distance sensor is arranged on the first square tube in the vertical direction, and the detection end of the distance sensor is located at the top of the arch.

[0015] Preferably, the buoyancy detection mechanism further includes a first nut, which is threadedly connected to the first fixing pin, and the first nut is located at the top end of the first square tube.

[0016] Preferably, the extrusion mechanism includes a top plate, a pressure plate, a second fixing pin and a spring; the top plate is arranged on an inclined plate, and a second guide plate extending obliquely downward is arranged at the bottom end of the top; the pressure plate is arranged at the bottom of the second square tube in parallel with the top plate, and a third guide plate bent upward is arranged on both sides of the pressure bag water passing mechanism; the second fixing pin is fixedly arranged on the pressure plate in the vertical direction, and the second fixing pin passes through the second square tube in the vertical direction and slides with it; the spring is sleeved on the second fixing pin, and the two ends of the spring respectively abut the bottom end of the second square tube and the top end of the pressure plate.

[0017] Preferably, the extrusion mechanism further includes a second nut, the second nut is threadedly connected to the second fixing pin, and the second nut is located at the top of the second square tube.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present application can press the air-filled bagged food into the water-filled tank through the bag pressing and water-filling mechanism, so that the buoyancy of each air-filled bagged food can be detected by the buoyancy detection mechanism, so as to subsequently screen out the air-filled bagged food with low buoyancy due to leakage, with high detection efficiency, and can be connected to the air-filled bagged food conveyor line for continuous detection;

[0020] 2. The present application uses a pulley and a trapezoidal conveyor belt to drive the air-filled bagged food to be pressed into water from one side of the water tank and then sent out from the other side of the water tank, so that the buoyancy detection mechanism can detect the buoyancy of the air-filled bagged food when it is pressed into water;

[0021] 3. The present application can increase the buoyancy difference between leaking air-bag food and non-leaking air-bag food through the top plate and the elastically arranged pressure plate, so as to facilitate more accurate detection of leaking air-bag food. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional diagram of the detection device of the present application;

[0023] Figure 2 is a side view of the detection device of the present application;

[0024] Figure 3 yes Figure 2 A three-dimensional cross-sectional view at section AA;

[0025] Figure 4 yes Figure 2 Cross-sectional view at section AA;

[0026] Figure 5 is a front view of the detection device of the present application;

[0027] Figure 6 yes Figure 5 A cross-sectional view at section BB of ;

[0028] Figure 7 yes Figure 5 A cross-sectional view at the CC section of FIG.

[0029] Figure 8 yes Figure 5 Cross-sectional view at the DD section;

[0030] Fig. 9 is a three-dimensional exploded view of the detection device of the present application;

[0031] Fig.10 It is a schematic diagram of the internal structure of the water tank of the present application.

[0032] The numbers in the figure are:

[0033] 1- water tank;

[0034] 2-bag pressing and water passing mechanism; 201-first square tube; 202-second square tube; 203-third tube; 204-first placement plate; 205-second placement plate; 206-pulley; 207-trapezoidal conveyor belt; 2071-partition plate; 208-motor; 209-first sliding block; 210-second sliding block; 211-bidirectional screw rod; 212-spline shaft;

[0035] 3-buoyancy detection mechanism; 301-supported plate; 3011-first guide plate; 302-arch frame; 303-first fixing pin; 304-distance sensor; 305-first nut;

[0036] 4-extrusion mechanism; 401-top plate; 4011-second guide plate; 402-pressing plate; 4021-third guide plate; 403-second fixing pin; 404-spring; 405-second nut. DETAILED DESCRIPTION

[0037] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] like Figure 1-Figure 10 As shown, this application provides:

[0039] A continuous air tightness detection device for air-filled bagged food packaging, comprising a water-passing box 1, a bag-pressing water-passing mechanism 2 and a buoyancy detection mechanism 3;

[0040] The bag pressing and water passing mechanism 2 is arranged in the water passing tank 1, and is used to press the air-filled bagged food into water from one side of the water passing tank 1 and then send it out from the other side of the water passing tank 1;

[0041] The buoyancy detection mechanism 3 is arranged in the water transfer box 1, and the buoyancy detection mechanism 3 is used to detect the buoyancy of the air-filled bagged food after being pressed into the water.

[0042] The air-filled bagged food moves in an orderly manner on the conveyor line. In the device, the air-filled bagged food moves from one side of the water tank 1 to the other side thereof;

[0043] The air-filled bagged food is pressed into the water by the bag pressing and water-passing mechanism 2. During this process, the bag pressing and water-passing mechanism 2 continuously guides the air-filled bagged food on the conveyor line into the water. At the same time, the buoyancy of the air-filled bagged food pressed into the water can be detected by the buoyancy detection mechanism 3.

[0044] The buoyancy of the leaking air-bag food is smaller than that of the non-leaking air-bag food, and the buoyancy of each air-bag food can be stably measured by the buoyancy detection mechanism 3. When the buoyancy of the detected air-bag food is smaller, it indicates that the air-bag food has leaked, and the leaking air-bag food can be sorted out of the conveyor line by a screening device arranged downstream of the detection device.

[0045] The present application can press the air-filled bagged food into the water-passing tank 1 through the bag pressing and water-passing mechanism 2, so that the buoyancy of each air-filled bagged food is detected by the buoyancy detection mechanism 3, so as to facilitate the subsequent screening of the air-filled bagged food with low buoyancy due to leakage. The detection efficiency is high and the air-filled bagged food can be connected to the air-filled bagged food conveyor line for continuous detection.

[0046] like Figure 3 As shown, further:

[0047] The utility model also comprises a squeezing mechanism 4, which is arranged in the water transfer box 1 and is used for squeezing the air-filled bagged food before being pressed into the water.

[0048] The buoyancy of leaking air-bag foods is less different than that of non-leaking air-bag foods, and the squeezing mechanism 4 can squeeze each air-bag food so that the leaking air-bag food can discharge more internal gas, thereby increasing the buoyancy difference between the leaking air-bag food and the non-leaking air-bag food, and thus the leaking air-bag food can be accurately detected.

[0049] like Figure 4 , Fig. 9 and Fig.10 As shown, further:

[0050] The water-passing box 1 has a groove, inclined parts arranged on both sides of the groove, and a horizontal part arranged outside the inclined parts; the bag pressing water-passing mechanism 2 includes a first square tube 201, a second square tube 202, a third tube 203, a first placement plate 204, a second placement plate 205, a pulley 206, a trapezoidal conveyor belt 207 and a motor 208;

[0051] The first square tube 201 is arranged at the upper part of the groove;

[0052] The second square tube 202 is arranged on the top of the inclined portion on the feed side of the water transfer box 1, and the third square tube 203 is arranged on the top of the inclined portion on the discharge side of the water transfer box 1;

[0053] The first placement plate 204 and the second placement plate 205 are symmetrically arranged on the first square tube 201, the second square tube 202 and the third square tube 203;

[0054] The pulley 206 is rotatably disposed on opposite sides of the first placement plate 204 and the second placement plate 205;

[0055] There are two trapezoidal conveyor belts 207, which are sleeved on the pulley 206, and the narrow section of the trapezoidal conveyor belt 207 is lower than the wide section thereof. The narrow section of the trapezoidal conveyor belt 207 is located at the top of the groove, and the waist section of the trapezoidal conveyor belt 207 is located at the top of the inclined portion.

[0056] The motor 208 is disposed on the water tank 1 , and the motor 208 is synchronously connected with the pulley 206 .

[0057] When the motor 208 is started, its output shaft drives the pulley 206 to rotate relative to the first placement plate 204 and the second placement plate 205, that is, the two trapezoidal conveyor belts 207 rotate between the first placement plate 204 and the second placement plate 205, and the air-filled bagged food slides to the horizontal part on one side of the water tank 1, and the trapezoidal conveyor belts 207 are pressed on both sides of the top of the air-filled bagged food. At the same time, the partition plate 2071 pushes the air-filled bagged food to the inclined part adjacent to the horizontal part, and then presses the air-filled bagged food into the water in the groove. The buoyancy detection mechanism 3 detects the air-filled bagged food when it is pressed into the water. The buoyancy generated is detected to detect whether the inflatable bagged food is leaking. The detection process is rapid. The trapezoidal conveyor belt 207 drives the inflatable bagged food to move to the inclined portion on the other side of the water tank 1, and then passes through the horizontal portion on the other side, so that the inflatable bagged food can be sent back to the conveyor line; the first square tube 201, the second square tube 202 and the third square tube 203 are used to place the first placement plate 204 and the second placement plate 205, so that the pulley 206 and the trapezoidal conveyor belt 207 can stably transmit the inflatable bagged food between the first placement plate 204 and the second placement plate 205;

[0058] The present application uses a pulley 206 and a trapezoidal conveyor belt 207 to drive the air-filled bagged food to be pressed into water from one side of the water tank 1 and then sent out from the other side of the water tank 1, so that the buoyancy detection mechanism 3 can detect the buoyancy of the air-filled bagged food when it is pressed into the water.

[0059] like Figure 4 As shown, further:

[0060] The bottom ends of the first placement plate 204 and the second placement plate 205 extend downward to the bottom of the trapezoidal conveyor belt 207 .

[0061] By extending the bottom ends of the first placement plate 204 and the second placement plate 205 downward to the bottom of the trapezoidal conveyor belt 207, the air-filled bagged food cannot slide along the width direction of the trapezoidal conveyor belt 207 when being conveyed by the trapezoidal conveyor belt 207, so that the air-filled bagged food can be stably conveyed by the trapezoidal conveyor belt 207.

[0062] like Figure 6 As shown, further:

[0063] The first placement plate 204 and the second placement plate 205 are slidably arranged on the first square tube 201, the second square tube 202 and the third square tube 203 in opposite directions; the bag pressing and water passing mechanism 2 also includes a first sliding block 209, a second sliding block 210 and a bidirectional screw rod 211;

[0064] The first sliding block 209 and the second sliding block 210 are slidably disposed on the third tube 203 in opposite directions. The upper portion of the first sliding block 209 is fixedly connected to the first placement plate 204, and the upper portion of the second sliding block 210 is fixedly connected to the second placement plate 205.

[0065] The bidirectional screw rod 211 is rotatably disposed in the third tube 203 , and the first sliding block 209 and the second sliding block 210 are threadedly connected to the bidirectional screw rod 211 .

[0066] Because the first placement plate 204 and the second placement plate 205 are arranged on the first square tube 201, the second square tube 202 and the third tube 203 in a manner of sliding toward or away from each other, by rotating the bidirectional screw rod 211 relative to the third tube 203, the first sliding block 209 and the second sliding block 210 can move toward or away from each other on the third tube 203, thereby driving the first placement plate 204 and the second placement plate 205 to move toward or away from each other, and then the distance between the two trapezoidal conveyor belts 207 can be adjusted, so that the trapezoidal conveyor belts 207 can move and transport inflatable bagged foods of different sizes, thereby improving the applicability of the device.

[0067] like Fig. 9 As shown, further:

[0068] The bag pressing and water passing mechanism 2 also includes a spline shaft 212, which is rotatably arranged on the water passing box 1. The spline shaft 212 coaxially passes through the pulley 206 on the first mounting plate 204 and the second mounting plate 205, and the spline shaft 212 is slidably engaged with the pulley 206; the output shaft of the motor 208 is coaxially fixedly connected to the spline shaft 212.

[0069] When the spacing between the trapezoidal conveyor belt 207 on the first mounting plate 204 and the trapezoidal conveyor belt 207 on the second mounting plate 205 changes, since the pulley 206 on the first mounting plate 204 and the pulley 206 on the second mounting plate 205 are engaged and slidably matched with the spline shaft 212, the starting motor 208 can transmit the torque to the pulley 206 on the first mounting plate 204 and the pulley 206 on the second mounting plate 205 through the spline shaft 212, so that it can respectively drive the trapezoidal conveyor belt 207 on the first mounting plate 204 and the trapezoidal conveyor belt 207 on the second mounting plate 205 for conveying.

[0070] like Figure 7 As shown, further:

[0071] The buoyancy detection mechanism 3 includes a supported plate 301, an arch frame 302, a first fixing pin 303 and a distance sensor 304;

[0072] The supported plate 301 is horizontally arranged between the two trapezoidal conveyor belts 207, and the supported plate 301 is provided with first guide plates 3011 bent upwards along both sides of the bag pressing and water passing mechanism 2;

[0073] The arch frame 302 is fixedly arranged on the top of the supported plate 301;

[0074] The first fixing pin 303 is fixedly arranged at the top of the arch frame 302, and the first fixing pin 303 vertically penetrates the first square tube 201 and slidably cooperates with the first square tube 201;

[0075] The distance sensor 304 is disposed on the first square tube 201 along the vertical direction, and the detection end of the distance sensor 304 is located at the top of the arch 302 .

[0076] When there is no inflatable bagged food in the trough, the bottom surface of the supported plate 301 is lower than the water surface of the trough, and the narrow section of the trapezoidal conveyor belt 207 is higher than the water surface of the trough. When the bag pressing and water-passing mechanism 2 drives the inflatable bagged food to move from the inclined portion to the trough, the inflatable bagged food slides against the bottom surface of the first guide plate 3011, thereby driving the supported plate 301 to move upward, and the first fixing pin 303 can stably constrain the supported plate 301 to move only in the vertical direction, and the distance sensor 304 can directly detect the lifting amount of the arch frame 302. When the inflatable bagged food leaks, the buoyancy of the inflatable bagged food is small, that is, the lifting amount of the supported plate 301 is low, and when the inflatable bagged food does not leak, the buoyancy of the inflatable bagged food is large, that is, the lifting amount of the supported plate 301 is high, and whether the inflatable bagged food leaks is detected in turn.

[0077] like Figure 7 As shown, further:

[0078] The buoyancy detection mechanism 3 further includes a first nut 305 , which is threadedly connected to the first fixing pin 303 , and the first nut 305 is located at the top end of the first square tube 201 .

[0079] By adjusting the position of the first nut 305 on the first fixing pin 303, the height of the supported plate 301 relative to the water surface in the groove can be adjusted, thereby detecting the buoyancy of air-filled bagged foods of different volumes.

[0080] like Figure 4 and Figure 8 As shown, further:

[0081] The pressing mechanism 4 includes a top plate 401, a pressing plate 402, a second fixing pin 403 and a spring 404;

[0082] The top plate 401 is arranged on the inclined plate, and a second guide plate 4011 extending obliquely downward is arranged at the bottom end of the top;

[0083] The pressing plate 402 is arranged parallel to the top plate 401 at the bottom of the second square tube 202, and the pressing plate 402 is provided with a third guide plate 4021 bent upward along both sides of the bag pressing and water passing mechanism 2;

[0084] The second fixing pin 403 is fixedly arranged on the pressing plate 402 along the vertical direction, and the second fixing pin 403 penetrates the second square tube 202 along the vertical direction and slidably cooperates with the second square tube 202;

[0085] The spring 404 is sleeved on the second fixing pin 403 , and two ends of the spring 404 abut against the bottom end of the second square tube 202 and the top end of the pressing plate 402 respectively.

[0086] By arranging the top plate 401 on the inclined section on one side of the water tank 1, the distance between the top plate 401 and the pressing plate 402 is smaller than the height of the air-filled bagged food. When the trapezoidal conveyor belt 207 moves the air-filled bagged food to the top plate 401, the air-filled bagged food needs to overcome the elastic force of the spring 404 to be sent between the top plate 401 and the pressing plate 402. The spring 404 can squeeze the air-filled bagged food, thereby increasing the buoyancy difference between the leaking air-filled bagged food and the non-leaking air-filled bagged food, so as to more accurately detect the leaking air-filled bagged food. The top plate 401 can be vertically and stably installed on the bottom of the second square tube 202 by the second fixing pin 403. The second guide plate 4011 on the other side of the water tank 1 is used to guide the air-filled bagged food in the groove to be quickly sent out. The third guide plate 4021 is used to guide the air-filled bagged food to be more accurately clamped between the top plate 401 and the pressing plate 402.

[0087] The present application can increase the buoyancy difference between leaking air-bag food and non-leaking air-bag food through the top plate 401 and the elastically arranged pressure plate 402, so as to more accurately detect the leaking air-bag food.

[0088] like Figure 8 As shown, further:

[0089] The extrusion mechanism 4 further includes a second nut 405 , which is threadedly connected to the second fixing pin 403 . The second nut 405 is located at the top of the second square tube 202 .

[0090] By adjusting the height of the second nut 405 on the second fixing pin 403, the sliding stroke of the second fixing pin 403 can be adjusted, thereby adjusting the initial distance between the top plate 401 and the pressing plate 402 to accommodate the extrusion of air-filled bagged foods of different volumes.

[0091] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A continuous air tightness detection device for air-filled bagged food packaging, characterized in that: It comprises a water passing box (1), a bag pressure water passing mechanism (2) and a buoyancy detection mechanism (3); The bag pressing and water passing mechanism (2) is arranged in the water passing tank (1), and is used to press the air-filled bagged food into water from one side of the water passing tank (1) and then send it out from the other side of the water passing tank (1); The buoyancy detection mechanism (3) is arranged in the water-passing box (1), and is used to detect the buoyancy of the air-filled bagged food after being pressed into water; the mechanism also includes a squeezing mechanism (4), and the squeezing mechanism (4) is arranged in the water-passing box (1), and is used to squeeze the air-filled bagged food before being pressed into water; the water-passing box (1) comprises a groove portion, and inclined portions arranged on both sides of the groove portion, and a horizontal portion arranged outside the inclined portion; the bag-pressing water-passing mechanism (2) comprises a first square tube (201), a second square tube (202), a third tube (203), a first placement plate (204), a second placement plate (205), a pulley (206), a trapezoidal conveyor belt (207), and a motor (208); The first square tube (201) is arranged at the upper part of the groove; The second square tube (202) is arranged at the top of the inclined portion on the feed side of the water transfer box (1), and the third square tube (203) is arranged at the top of the inclined portion on the discharge side of the water transfer box (1); The first placement plate (204) and the second placement plate (205) are symmetrically arranged on the first square tube (201), the second square tube (202) and the third square tube (203); The pulley (206) is rotatably arranged on opposite sides of the first placement plate (204) and the second placement plate (205); There are two trapezoidal conveyor belts (207), which are sleeved on the pulley (206), the narrow section of the trapezoidal conveyor belt (207) is lower than the wide section, the narrow section of the trapezoidal conveyor belt (207) is located at the top of the groove, and the waist section of the trapezoidal conveyor belt (207) is located at the top of the inclined section; the two trapezoidal conveyor belts (207) rotate between the first placement plate (204) and the second placement plate (205), and the air-filled bagged food slides to one side of the water tank (1). The trapezoidal conveyor belt (207) is pressed on both sides of the top of the air-filled bagged food, the partition plate (2071) pushes the air-filled bagged food to the inclined portion adjacent to the horizontal portion, and then presses the air-filled bagged food into the water in the groove portion, the buoyancy detection mechanism (3) detects the buoyancy generated by the air-filled bagged food when it is pressed into the water, and the trapezoidal conveyor belt (207) drives the air-filled bagged food to move to the inclined portion on the other side of the water tank (1), and then passes through the horizontal portion on the other side; The motor (208) is arranged on the water tank (1), and the motor (208) is synchronously connected to the pulley (206); The first placement plate (204) and the second placement plate (205) are slidably arranged on the first square tube (201), the second square tube (202) and the third square tube (203) in opposite directions; the bag pressing and water passing mechanism (2) further comprises a first sliding block (209), a second sliding block (210) and a bidirectional screw rod (211); The first sliding block (209) and the second sliding block (210) are slidably arranged on the third tube (203) in opposite directions, the upper part of the first sliding block (209) is fixedly connected to the first placement plate (204), and the upper part of the second sliding block (210) is fixedly connected to the second placement plate (205); The bidirectional screw rod (211) is rotatably disposed in the third tube (203), and the first sliding block (209) and the second sliding block (210) are threadedly connected to the bidirectional screw rod (211); The buoyancy detection mechanism (3) comprises a supported plate (301), an arch frame (302), a first fixing pin (303) and a distance sensor (304); The supported plate (301) is horizontally arranged between the two trapezoidal conveyor belts (207), and the supported plate (301) is provided with first guide plates (3011) bent upwards along both sides of the bag pressing and water passing mechanism (2); The arch frame (302) is fixedly arranged on the top of the supported plate (301); The first fixing pin (303) is fixedly arranged at the top end of the arch frame (302), and the first fixing pin (303) passes through the first square tube (201) in the vertical direction and slidably cooperates with the first square tube (201); The distance sensor (304) is arranged on the first square tube (201) in a vertical direction, and the detection end of the distance sensor (304) is located at the top of the arch frame (302); The buoyancy detection mechanism (3) further comprises a first nut (305), the first nut (305) being threadedly connected to the first fixing pin (303), and the first nut (305) being located at the top end of the first square tube (201); The extrusion mechanism (4) comprises a top plate (401), a pressure plate (402), a second fixing pin (403) and a spring (404); The top plate (401) is arranged on the inclined plate, and a second guide plate (4011) extending obliquely downward is arranged at the bottom end of the top; The pressing plate (402) is arranged parallel to the top plate (401) at the bottom of the second square tube (202), and the pressing plate (402) is provided with third guide plates (4021) bent upwards along both sides of the pressing bag water passing mechanism (2); The second fixing pin (403) is fixedly arranged on the pressing plate (402) in the vertical direction, and the second fixing pin (403) penetrates the second square tube (202) in the vertical direction and slidably cooperates with the second square tube (202); The spring (404) is sleeved on the second fixing pin (403), and two ends of the spring (404) are respectively abutted against the bottom end of the second square tube (202) and the top end of the pressing plate (402); The extrusion mechanism (4) further comprises a second nut (405), the second nut (405) being threadedly connected to the second fixing pin (403), and the second nut (405) being located at the top of the second square tube (202).

2. The device for continuous air tightness detection of air-filled bagged food packaging according to claim 1, characterized in that: The bottom ends of the first placement plate (204) and the second placement plate (205) extend downward to the bottom of the trapezoidal conveyor belt (207).

3. The device for continuous air tightness detection of air-filled bagged food packaging according to claim 2, characterized in that: The bag pressing and water-passing mechanism (2) further comprises a spline shaft (212), which is rotatably arranged on the water-passing box (1), the spline shaft (212) coaxially passing through the pulleys (206) on the first placement plate (204) and the second placement plate (205), the spline shaft (212) and the pulleys (206) being engaged and slidably matched; and the output shaft of the motor (208) is coaxially fixedly connected to the spline shaft (212).

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