Inflatable food bag airtight performance inspection and detection device

Abstract

The utility model relates to an inflatable food bag airtight performance inspection and detection device, which comprises a rack, a conveying belt assembly, a constant pressure auxiliary belt assembly and a pressure applying and sensing assembly, and is characterized in that the rack is a space frame structural member and is used for fixing and installing other functional assemblies; the conveying belt assembly, the constant-pressure auxiliary belt assembly and the pressure applying and sensing assembly are all arranged on the rack. The technical scheme is simple and reliable in structure, high in detection accuracy, small in occupied area and convenient to use.

Description

Technical Field

[0001] The invention relates to an inspection and detection device, in particular to an airtightness inspection and detection device for an air-filled food bag, and belongs to the technical field of food processing machinery. Background Art

[0002] For bagged food, especially ready-to-eat bagged food, inert gas, such as nitrogen, carbon dioxide, oxygen or a mixture of two or three gases, is injected into the bag during its production and packaging process to fill the bag and keep the bag under positive pressure to prevent air from entering the bag, thus protecting the food. Its carbon dioxide can dissolve in various fats or water, and form weakly acidic carbonic acid, which can inhibit the activity of microorganisms such as mold and spoilage bacteria. Its oxygen can inhibit the growth and reproduction of anaerobic bacteria, keep fruits and vegetables fresh and colorful, and high-concentration oxygen can keep fresh meat bright.

[0003] Inflatable food bags are usually sealed by hot pressure. During the production and transportation process, due to the forces of squeezing, impact, etc., some foods with poor sealing quality may be damaged or leak due to heat, causing the food in the inflatable food bags to deteriorate too quickly, seriously affecting the batch quality of the food. In order to solve the above technical problems, it is necessary to develop a sealing quality inspection and detection device for inflatable food bags. The new technology device is set at a certain node of a certain section of the conveying path of the inflatable food bags during the production process, and is clamped and conveyed by a constant pressure auxiliary belt. A certain pressure is applied to the inflatable food bags passing through the new technology device. The food bags that can withstand the pressure will smoothly pass through the auxiliary clamping belt and continue to be conveyed to the next operation process. The food bags that are crushed are of poor sealing quality, and will be blown away from the conveyor belt by the air blowing port set at the rear of the auxiliary clamping belt and enter the waste collection area, thereby completing the airtight performance inspection and detection of the inflatable food bags. The new technology device has the technical advantages of simple and reliable structure, high inspection and detection accuracy, small footprint and easy use. Summary of the invention

[0004] The present invention aims at the problems existing in the prior art and provides a device for testing and detecting the airtightness of an inflated food bag. The technical solution has a simple and reliable structure, a high testing and detection accuracy, a small footprint and is easy to use.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: an airtight performance inspection and detection device for an inflated food bag, the device comprising a frame 1, a conveyor belt assembly 2, a constant pressure auxiliary belt assembly 3, and a pressure and sensing assembly 4, wherein the frame 1 is a space frame structure for fixing and installing other functional components, and the conveyor belt assembly 2, the constant pressure auxiliary belt assembly 3, and the pressure and sensing assembly 4 are all arranged on the frame 1.

[0006] As an improvement of the present invention, the conveyor belt assembly 2 includes a first conveyor roller 201, a second conveyor roller 202, a conveyor belt 203 and a conveyor roller bracket 204, wherein the first conveyor roller 201 and the second conveyor roller 202 are rotatably installed at both ends of the conveyor roller bracket 204, and the conveyor roller bracket 204 is two pieces symmetrically arranged on both sides of the conveyor roller; the conveyor belt 203 is a closed-loop structure, covering the outer peripheral surfaces of the first conveyor roller 201 and the second conveyor roller 202, and one end of the first conveyor roller 201 or the second conveyor roller 202 is coaxially provided with a power drive device (not shown in the figure), under the drive of the power drive device, the first conveyor roller 201 or the second conveyor roller 202 rotates, so that the conveyor belt 203 rotates counterclockwise under the drive of the first conveyor roller 201 and the second conveyor roller 202.

[0007] As an improvement of the present invention, the conveyor belt assembly 2 also includes a blowing piece 205, a sensor 206 and a food bag 207, wherein the air outlet piece 205 is a hollow structure as a whole, and one end of the air outlet piece 205 has a flat mouth structure design, which is arranged on one side of the conveyor belt 203 and located on the upper part of the upper plane of the conveyor belt 203, and its flat mouth faces the conveyor belt, and the other port of the air outlet piece 205 is connected to and controlled by a pressurized air source. When the air source is turned on, the air flow will blow toward the conveyor belt 203 through the flat mouth of the air outlet piece 205; the sensor 206 is arranged on one side of the conveyor belt 203 and located on the upper part of the upper plane of the conveyor belt 203, and the signal detection end of the sensor 206 faces the conveyor belt 203, and is used to detect the food bag 207 transported by the conveyor belt 203 and generate a signal.

[0008] As an improvement of the present invention, the constant pressure auxiliary belt assembly 3 includes a first auxiliary roller 301, a second auxiliary roller 302, an auxiliary conveyor belt 303 and an auxiliary roller bracket 304, wherein the first auxiliary roller 301 and the second auxiliary roller 302 are rotatably installed at both ends of the auxiliary roller bracket 304, and the auxiliary roller bracket 304 is two pieces symmetrically arranged at both ends of the auxiliary roller; the auxiliary conveyor belt 303 is a closed-loop structure, which is covered on the outer circumference of the first auxiliary roller 301 and the second auxiliary roller 302. Driven by the first auxiliary roller 301 or the second auxiliary roller 302, the auxiliary conveyor belt 303 rotates in a clockwise direction, that is, the lower plane of the auxiliary conveyor belt 303 and the upper plane of the conveyor belt 203 move from right to left, driving the conveyor belt 203 to rotate in a clockwise direction. The food bag 207 on the plane of the conveyor belt 203 moves from right to left; the constant pressure auxiliary belt assembly 3 also includes an auxiliary belt main bracket 309, which is also arranged in pairs and arranged on both sides of the auxiliary belt bracket 304 respectively. The lower part of the auxiliary belt main bracket 309 is fixed to the frame 1, and a mounting hole is provided on the upper part thereof. The hole is connected to the second auxiliary roller 302 coaxially and rotatably by a bearing seat. In this way, on the one hand, the first auxiliary roller 301, the second auxiliary roller 302 and the auxiliary belt 303 can rotate in the bracket 304, and on the other hand, the integral component formed by the first auxiliary roller 301, the second auxiliary roller 302, the auxiliary belt 303 and the bracket 304 can deflect around the through hole on the upper part of the auxiliary belt main bracket 309;

[0009] As an improvement of the present invention, the constant pressure auxiliary belt assembly 3 also includes an auxiliary belt passive wheel 305, a power transmission chain 306, an auxiliary belt driving wheel 307 and a power motor 308, wherein the auxiliary belt passive wheel 305 is coaxially fixedly installed at one end of the second auxiliary roller 302, and is connected to the auxiliary belt driving wheel 307 through the power transmission chain 306, and the auxiliary belt driving wheel 307 is installed on the output shaft of the power motor 308, so that the power motor 308 drives the second auxiliary roller 302 to rotate through the auxiliary belt driving wheel 307, the power transmission chain 306 and the auxiliary belt passive wheel 305.

[0010] As an improvement of the present invention, the pressure and sensing component 4 includes a pressure outer frame 401, a pressure piece 402, a pressure inner frame 403 and a sensor 404, wherein the pressure outer frame 401 is an inverted U-shaped member as a whole, which is fixedly mounted downward on the conveying roller bracket 204 or the frame 1, and the pressure inner frame 402 is an inverted U-shaped member as a whole, which is fixedly mounted downward on the auxiliary roller bracket 304 and close to the first auxiliary roller 301. The pressure piece 402 is configured as a compression spring, which is arranged between the outer frame 401 and the inner frame 403. In this way, a force is applied downward to the inner frame 403 through the outer frame 401 and the pressure piece 402, and then pressure is applied to the auxiliary belt assembly 3 close to the first auxiliary roller 301 through the inner frame 403 and the auxiliary roller bracket 304, so that the auxiliary belt 303 wrapped around the outer periphery of the first auxiliary roller 301 is pressed against the upper surface of the conveyor belt 203. When the food bag 207 moves along the conveyor belt 203 from Figure 1 , Figure 3 When the food bag 207 moves from the right side to the left side in the orientation shown, the food bag 207 will pass through the inverted "V" mouth channel formed between the conveyor belt 203 and the auxiliary belt 303, and the food bag 207 will be squeezed by the auxiliary belt 303 and the conveyor belt 203; the sensor 404 is installed on one side of the auxiliary belt assembly 3 and is aligned with a certain detection surface on the auxiliary belt assembly 3, and is used to detect the deflection rotation signal of the auxiliary belt assembly 3, that is: when the food bag 207 moves to the position directly below the first auxiliary roller 301, if the food bag 207 is not crushed, the first auxiliary roller 301 will be supported to the highest position by the food bag 207, so that the auxiliary belt assembly 3 as a whole will have the maximum deflection rotation in the clockwise direction around the concentric axis of the second auxiliary roller 302, and the sensor 404 will be triggered to generate a signal, and if the food bag 207 is crushed before reaching the first auxiliary roller 301, the overall deflection rotation angle of the auxiliary belt assembly 3 is very small, and the sensor 404 will not be triggered to output a signal.

[0011] As an improvement of the present invention, by adjusting the distance between the outer bow frame 401 and the inner bow frame 403, or adjusting the screw on the upper part of the pressure member 402, the pre-pressure of the pressure member 2 can be changed to adapt to food bags of different batches and different materials, so as to accurately pick out food bags with poor sealing performance.

[0012] As an improvement of the present invention, the upper plane of the conveyor belt 203 is arranged horizontally, and the left end of the auxiliary belt 303 is pressed against the upper plane of the conveyor belt 203 by the first auxiliary roller 301 through the pressure component 4, so that an inverted "V"-shaped channel opening to the right is formed between the auxiliary belt 303 and the conveyor belt 203.

[0013] Compared with the prior art, the present invention has the following advantages. First, the technical device of the present invention can be easily installed in the existing food bag conveying device to increase the airtightness inspection and detection function of the inflated food bag. This is based on the fact that the constant pressure auxiliary belt assembly 3 of the device of the present invention is a closed-loop double-roller assembly with independent power drive, one end of which is hinged and fixed to the frame of the horizontal conveyor belt of the prior art, and an inverted "V"-shaped opening is set between the conveyor belt 303 of the constant pressure auxiliary belt assembly 3 and the horizontal conveyor belt, so that the food packaging bag located on the horizontal conveyor belt can smoothly enter the inverted "V"-shaped opening formed between the constant pressure auxiliary belt 303 and the horizontal conveyor belt and gradually be squeezed by the two. In this way, as long as the food bag moves on the horizontal conveyor belt It will definitely pass through the constant pressure auxiliary belt assembly 3 and be squeezed; secondly, the pressure can be precisely adjusted, and the size of the squeezing force is determined by the size of the pressure of the pressure piece 402 above the door frame 403 at the other end of the constant pressure auxiliary belt assembly 3. The pressure can be precisely adjusted by the bolts on the outer door frame 401 above the pressure piece to adapt to the inspection and detection of inflatable food belts of different batches and different packaging materials, so as to be accurate, reliable and widely adaptable; thirdly, it has a detection and separation device for defective inflatable bags, which is a blowing piece 205 arranged on one side of the horizontal conveyor belt. The defective food belt is blown away from the horizontal conveyor belt by program control and falls into the defective collection area arranged on the other side of the horizontal conveyor belt, so as to realize the accurate separation of good products and defective products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure shows a side structural schematic diagram of the airtightness testing and detection device for an inflatable food bag of the present invention;

[0015] Figure 2 The figure shows a schematic diagram of the end view of the airtightness testing and detection device for an inflatable food bag of the present invention;

[0016] Figure 3 The diagram shows the device for testing and detecting the airtightness of an inflatable food bag of the present invention in a state where the food bag is propped up.

[0017] In the figure: 1. frame; 2. conveyor belt assembly: 201. first conveyor roller, 202. second conveyor roller, 203. conveyor belt, 204. conveyor roller bracket, 205. blowing member, 206. sensor, 207 (207′), inflatable food bag; 3. constant pressure auxiliary belt assembly: 301. first auxiliary roller, 302. second auxiliary roller, 303. auxiliary conveyor belt, 304. auxiliary roller bracket, 305. auxiliary belt passive wheel, 306. power transmission chain, 307. auxiliary belt driving wheel, 308. auxiliary belt power motor, 309. auxiliary belt main bracket; 4. pressure and sensor assembly: 401. pressure outer bow frame, 402. pressure member, 403. pressure inner bow frame, 404. sensor. DETAILED DESCRIPTION

[0018] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0019] Example 1: See Figure 1 ,like Figure 1 , Figure 2 As shown, an airtight performance inspection and detection device for an inflated food bag comprises a frame 1, a conveyor belt assembly 2, a constant pressure auxiliary belt assembly 3, and a pressure and sensor assembly 4, wherein the frame 1 is a space frame structure for fixing and installing other functional components, and the conveyor belt assembly 2, the constant pressure auxiliary belt assembly 3, and the pressure and sensor assembly 4 are all arranged on the frame 1.

[0020] like Figure 1 , Figure 2 As shown, the rack 1 is a space frame structure for fixing and installing other functional components.

[0021] like Figure 1 , Figure 2 As shown, the conveyor belt assembly 2 includes a first conveyor roller 201, a second conveyor roller 202, a conveyor belt 203, a conveyor roller bracket 204, a blowing member 205, a sensor 206, etc. Among them, the first conveyor roller 201 and the second conveyor roller 202 are rotatably mounted on both ends of the conveyor roller bracket 204, and the conveyor roller bracket 204 is symmetrically arranged on both sides of the conveyor roller; the conveyor belt 203 is a closed-loop structure, covering the outer circumference of the first conveyor roller 201 and the second conveyor roller 202, and one end of the first conveyor roller 201 or the second conveyor roller 202 is coaxially provided with a power drive device (not shown in the figure), and under the drive of the power drive device, the first conveyor roller 201 or the second conveyor roller 202 rotates, so that the conveyor belt 203 rotates in the counterclockwise direction shown in the figure under the drive of the conveyor rollers 201 and 202; the conveyor belt assembly 2 also includes a blowing member. Part 205, sensor 206 and food bag 207, wherein the air outlet part 205 is a hollow structure as a whole, and one end of the air outlet part 205 has a flat-mouth structure design, which is arranged on one side of the conveyor belt 203 and located on the upper part of the upper plane of the conveyor belt 203, and its flat mouth faces the conveyor belt, and the other end of the air outlet part 205 is connected to and controlled by a pressurized air source. When the air source is turned on, the air flow will blow toward the conveyor belt 203 through the flat mouth of the air outlet part 205; the sensor 206 is arranged on one side of the conveyor belt 203 and located on the upper part of the upper plane of the conveyor belt 203, and the signal detection end of the sensor 206 faces the conveyor belt 203, and is used to detect the food bag 207 transported by the conveyor belt 203 and generate a signal.

[0022] like Figure 1 , Figure 2As shown, the constant pressure auxiliary belt assembly 3 includes a first auxiliary roller 301, a second auxiliary roller 302, an auxiliary conveyor belt 303, and an auxiliary roller bracket 304, wherein the first auxiliary roller 301 and the second auxiliary roller 302 are rotatably mounted at both ends of the auxiliary roller bracket 304, and the auxiliary roller bracket 304 is two pieces symmetrically arranged at both ends of the auxiliary roller; the auxiliary belt 303 is a closed loop structure, which is coated on the outer circumference of the first auxiliary roller 301 and the second auxiliary roller 302. Driven by the first auxiliary roller 301 or the second auxiliary roller 302, the auxiliary belt 303 is Figure 1 The clockwise rotation of the position shown, that is, the lower plane of the auxiliary belt 303 and the upper plane of the conveyor belt 203 are in the same direction. Figure 1 The movement from right to left in the direction shown drives the food bag 207 located on the upper plane of the conveyor belt 203 to move from right to left; the constant pressure auxiliary belt assembly 3 also includes an auxiliary belt main bracket 309, which is also arranged in pairs and arranged on both sides of the auxiliary belt bracket 304 respectively. The lower part of the auxiliary belt main bracket 309 is fixed to the frame 1, and a mounting hole is provided on the upper part thereof. The hole is connected to the second auxiliary roller 302 coaxially and rotatably by a bearing seat. In this way, on the one hand, the first auxiliary roller 301, the second auxiliary roller 302 and the auxiliary belt 303 can rotate in the bracket 304, and on the other hand, the first auxiliary roller 301 and the second auxiliary roller The integral component formed by 302, the auxiliary belt 303 and the bracket 304 can perform deflection movement around the through hole on the upper part of the auxiliary belt main bracket 309; the constant pressure auxiliary belt assembly 3 also includes an auxiliary belt passive wheel 305, a power transmission chain 306, an auxiliary belt driving wheel 307 and a power motor 308, wherein the auxiliary belt passive wheel 305 is coaxially fixedly installed at one end of the second auxiliary roller 302, and is connected to the driving wheel 307 through the power transmission chain 306, and the driving wheel 307 is installed on the output shaft of the power motor 308, so that the power motor 308 drives the second auxiliary roller 302 to rotate through the driving wheel 307, the transmission chain 306 and the passive wheel 305.

[0023] like Figure 1 , Figure 2As shown, the pressure and sensing component 4 includes a pressure outer arch frame 401, a pressure piece 402, a pressure inner arch frame 403 and a sensor 404, wherein the pressure outer arch frame 401 is an inverted U-shaped piece as a whole, which is fixedly mounted downward on the conveying roller bracket 204 or the frame 1, and the pressure inner arch frame 402 is an inverted U-shaped piece as a whole, which is fixedly mounted downward on the auxiliary roller bracket 304 and close to the first auxiliary roller 301. The pressure piece 402 is preferably a compression spring, which is arranged on the outer arch frame 401 and the inner arch frame 403 bracket. In this way, a force is applied downward to the inner arch frame 403 through the outer arch frame 401 and the pressure piece 402, and then a pressure is applied to the auxiliary belt assembly 3 close to the first auxiliary roller 301 through the inner arch frame 403 and the auxiliary roller bracket 304, so that the auxiliary belt 303 wrapped around the outer periphery of the first auxiliary roller 301 is pressed against the upper surface of the conveyor belt 203. When the food bag 207 moves along the conveyor belt 203 from Figure 1 , Figure 3 When the food bag 207 moves from the right side to the left side in the illustrated orientation, the food bag 207 will pass through the inverted "V" opening channel formed between the conveyor belt 203 and the auxiliary belt 303, and the food bag 207 will be squeezed by the auxiliary belt 303 and the conveyor belt 203. The sensor 404 is installed on one side of the auxiliary belt assembly 3 and is aligned with a certain detection surface on the auxiliary belt assembly 3, and is used to detect the deflection rotation signal of the auxiliary belt assembly 3, that is, when the food bag 207 moves to the position directly below the first auxiliary roller 301, if the food bag 207 is not crushed, the first auxiliary roller 301 will be supported to the highest position by the food bag 207, so that the auxiliary belt assembly 3 as a whole will have the maximum deflection rotation in the clockwise direction in the illustrated orientation around the concentric axis of the second auxiliary roller 302, and the sensor 404 will be triggered to generate a signal. If the food bag 207 is crushed before reaching the first auxiliary roller 301, the overall deflection rotation angle of the auxiliary belt assembly 3 is very small, and the sensor 404 will not be triggered to output a signal.

[0024] By adjusting the distance between the outer frame 401 and the inner frame 403, or adjusting the screw on the upper part of the pressure piece 402, the pre-pressure of the pressure piece 2 can be changed to adapt to food bags of different batches and different materials, so as to accurately select food bags with poor sealing performance.

[0025] Working principle: To facilitate further understanding of the present invention, the specific working process of the airtightness testing and detection device for inflatable food bags of the present invention is described in detail below in conjunction with the accompanying drawings: Figure 1As shown in the figure, the upper plane of the conveyor belt 203 is arranged horizontally, and the left end of the auxiliary belt 303 is pressed against the upper plane of the conveyor belt 203 by the first auxiliary roller 301 through the pressure component 4, so that an inverted "V"-shaped channel opening to the right is formed between the auxiliary belt 303 and the conveyor belt 203; the conveyor belt 203 moves in the counterclockwise direction of the figure, and the auxiliary belt 303 moves in the clockwise direction of the figure, that is, the upper plane of the conveyor belt 203 and the lower plane of the auxiliary belt 303 are both moving from right to left, and the linear speeds of the two are consistent; the food bag 207 to be detected is located on the upper surface of the conveyor belt 203 and is driven by the conveyor belt 203 to move from right to left in the figure. When the bag 207 passes the corresponding detection position of the sensor 206, the sensor 206 will be triggered to output a signal, triggering the control system to start timing calculation; then the food bag 207 continues to move to the left, begins to enter the inverted "V" shaped channel and gradually bears the squeezing force of the conveyor belt 203 and the auxiliary belt 303, until the food bag 207 is output to the left side of the auxiliary belt 203. During this process, the food bag 207 with good sealing performance will pass through the inverted "V" shaped channel normally without being crushed. On the contrary, some food bags 207 with poor sealing performance will be crushed during the process of passing through the inverted "V" shaped channel; if the food bag 207 is not crushed during the process of passing through the inverted "V" shaped channel, the food bag 207′ will be crushed when it reaches the first When the food bag 207' passes below the first auxiliary roller 301, the first auxiliary roller 301 will be supported to the maximum extent, so that the auxiliary belt assembly 3 will deflect in the clockwise direction of the illustrated orientation, and the sensor 404 will be triggered to output a signal. After the control system and the timing program triggered by the signal generated by the sensor 206 compare and process the signal, it will be identified as a release state. Then, when the food bag 207' subsequently moves to the left and passes the position of the blowing member 205, the blowing member 205 will not move, and the food bag 207' will run normally to the genuine operation area; in the second case, if the food bag 207 is crushed during the process of passing through the inverted "V"-shaped channel, the food bag 207' will shrink due to the loss of gas, and it will not move when it reaches the first auxiliary roller 301. When the first auxiliary roller 301 is supported below the conveyor belt 203, the height of the auxiliary belt assembly 3 in the clockwise direction in the illustrated direction is also very small, which is not enough to trigger the sensor 404 to output a signal, resulting in the failure to detect the signal of the sensor 404 in the timing program segment triggered by the signal generated by the sensor 206, thereby judging and identifying it as a detection state. In this way, when the deflated defective food bag 207′ subsequently moves to the left and passes the position of the blowing member 205, the blowing member 205 will produce an air blowing effect, blowing the defective food bag 207′ away from the conveyor belt 203 and into the defective product processing area arranged on one side of the conveyor belt 203, thereby realizing the sealing performance inspection and detection operation of the inflated food bag.

[0026] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A device for testing and detecting the airtightness of an inflatable food bag, characterized in that: The device comprises a frame, a conveyor belt assembly, a constant pressure auxiliary belt assembly, and a pressure and sensor assembly. The rack is a space frame structure used to fix and install various functional components. The conveyor belt assembly, constant pressure auxiliary belt assembly, and pressure and sensor assembly are all arranged on the frame. The conveyor belt assembly includes a first conveyor roller, a second conveyor roller, a conveyor belt and a conveyor roller bracket, wherein the first conveyor roller and the second conveyor roller are rotatably mounted at both ends of the conveyor roller bracket, and the conveyor roller bracket is symmetrically arranged on both sides of the conveyor roller; the conveyor belt is a closed-loop structure, covering the outer circumference of the first conveyor roller and the second conveyor roller, and one end of the first conveyor roller or the second conveyor roller is coaxially provided with a power driving device, and under the drive of the power driving device, the first conveyor roller or the second conveyor roller performs a rotational motion, so that the conveyor belt performs a counterclockwise rotational motion under the drive of the first conveyor roller and the second conveyor roller, The constant pressure auxiliary belt assembly includes a first auxiliary roller, a second auxiliary roller, an auxiliary conveyor belt and an auxiliary roller bracket, wherein the first auxiliary roller and the second auxiliary roller are rotatably installed at both ends of the auxiliary roller bracket, and the auxiliary roller bracket is two pieces symmetrically arranged at both ends of the auxiliary roller; the auxiliary conveyor belt is a closed-loop structure, which is covered on the outer circumference of the first auxiliary roller and the second auxiliary roller. Driven by the first auxiliary or the second auxiliary roller, the auxiliary conveyor belt rotates clockwise, and the lower plane of the auxiliary conveyor belt and the upper plane of the conveyor belt move from right to left, driving the food bag located on the upper plane of the conveyor belt to move from right to left; the constant pressure auxiliary belt assembly also includes an auxiliary belt main bracket, which is also arranged in pairs and respectively arranged on both sides of the auxiliary belt bracket. The lower part of the auxiliary belt main bracket is fixed to the frame, and the upper part of the auxiliary belt main bracket is provided with a mounting hole, which is coaxially rotatably connected with the second auxiliary roller by a bearing seat. The pressure and sensing assembly includes a pressure outer arch frame, a pressure piece, a pressure inner arch frame and a sensor, wherein the pressure outer arch frame as a whole is an inverted U-shaped piece, which is fixedly installed downward on the conveying roller bracket or the frame, and the pressure inner arch frame as a whole is an inverted U-shaped piece, which is fixedly installed downward on the auxiliary roller bracket and close to the first auxiliary roller. The pressure piece is configured as a compression spring, which is arranged between the outer arch frame and the inner arch frame. A force is applied downward to the inner arch frame through the outer arch frame and the pressure piece, and then pressure is applied to the auxiliary belt assembly close to the first auxiliary roller through the inner arch frame and the auxiliary roller bracket, so that the auxiliary belt wrapped around the outer periphery of the first auxiliary roller is pressed against the conveyor belt. On the upper surface of the auxiliary belt assembly, the sensor is installed on one side of the auxiliary belt assembly and is aligned with a detection surface on the auxiliary belt assembly to detect the deflection rotation signal of the auxiliary belt assembly, that is: when the food bag moves to the position directly below the first auxiliary roller, if the food bag is not crushed, the first auxiliary roller will be supported to the highest position by the food bag, so that the auxiliary belt assembly 3 as a whole will undergo the maximum deflection rotation in the clockwise direction around the concentric axis of the second auxiliary roller, and the sensor will be triggered to generate a signal; if the food bag is crushed before reaching the first auxiliary roller, the overall deflection rotation angle of the auxiliary belt assembly is very small and will not trigger the sensor to output a signal.

2. The airtightness testing and detection device for an inflatable food bag according to claim 1, characterized in that The conveyor belt assembly also includes an air blowing piece, a sensor and a food bag, wherein the air outlet piece is a hollow structure as a whole, and one end of the air outlet piece has a flat-mouth structure design. The air outlet piece is arranged on one side of the conveyor belt and located on the upper part of the upper plane of the conveyor belt, and its flat mouth faces the conveyor belt. The other port of the air outlet piece is connected to and controlled by a pressurized air source. When the air source is turned on, the air flow will blow toward the conveyor belt through the flat mouth of the air outlet piece; the sensor is arranged on one side of the conveyor belt and located on the upper part of the upper plane of the conveyor belt. The signal detection end of the sensor faces the conveyor belt, and is used to detect the food bag transported by the conveyor belt and generate a signal.

3. The airtightness testing and detection device for an inflatable food bag according to claim 2, characterized in that: The constant-pressure auxiliary belt assembly also includes an auxiliary belt passive wheel, a power transmission chain, an auxiliary belt driving wheel and a power motor, wherein the auxiliary belt passive wheel is coaxially fixedly installed at one end of the second auxiliary roller, and is connected to the auxiliary belt driving wheel through the power transmission chain, and the auxiliary belt driving wheel is installed on the output shaft of the power motor. In this way, the power motor drives the second auxiliary roller to rotate through the auxiliary belt driving wheel, the power transmission chain and the auxiliary belt passive wheel.

4. The airtightness testing and detection device for an inflatable food bag according to claim 3, characterized in that: By adjusting the distance between the outer bow frame and the inner bow frame, or adjusting the screw on the upper part of the pressure piece, the pre-pressure of the pressure piece can be changed to adapt to food bags of different batches and different materials, so as to accurately select food bags with poor sealing performance.

5. The airtightness testing and detection device for an inflatable food bag according to claim 4, characterized in that: The upper plane of the conveyor belt is arranged horizontally, and the left end of the auxiliary belt is pressed against the upper plane of the conveyor belt by the first auxiliary roller through the pressure component, so that an inverted "V"-shaped channel opening to the right is formed between the auxiliary belt and the conveyor belt.

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