An automatic airtightness detection device for canned food packaging

Abstract

The present invention relates to the field of airtightness detection technology, and specifically to an automatic airtightness detection device for canned food packaging, comprising a lower conveyor line, an upper conveyor line, a pressure sealing fixture, an adjusting slide rail and an air pressure detection mechanism; the pressure sealing fixture is arranged at equal intervals on the conveying surface of the upper conveyor line, and the pressure sealing fixture can form a gradually pressurized sealed cavity on the upper part of the can body; the adjusting slide rail is arranged on the lower conveyor line and the upper conveyor line, and the adjusting slide rail is used to guide the pressure sealing fixture at the bottom of the upper conveyor line to form a gradually pressurized sealed cavity on the upper part of the can body. The present application is connected to the can body production line through the lower conveyor line, and a gradually pressurized sealed cavity can be formed on the upper part of each can body on the lower conveyor line through the upper conveyor line, the pressure sealing fixture and the adjusting slide rail, and the pressure change of the sealed cavity can be detected by the air pressure detection mechanism, so as to determine whether the can body is leaking, and the detection efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, in particular to an automatic air tightness detection device for canned food packaging. Background Art

[0002] Food canning involves sealing food in a container, sterilizing it through a sterilization process to eliminate most microorganisms. This allows for long-term storage at room temperature while maintaining a sealed, vacuum-free environment. The airtightness of canned food determines its quality and acceptance rate. Therefore, prior to canning, cans such as tinplate cans must be tested for airtightness to prevent microbial contamination and spoilage due to air leaks, which could lower the product's acceptance rate.

[0003] Chinese patent application number CN108303224B discloses a food can airtightness testing device, which is intended to provide a food can airtightness testing device capable of quickly testing the airtightness of canned food. The device comprises a frame, a food can positioning seat disposed on the frame, and an airtightness testing mechanism, the airtightness testing mechanism comprising a booster pump, a horizontal pressure plate positioned above the food can positioning seat, a vertical guide sleeve disposed on the frame and above the horizontal pressure plate, a vertical guide rod disposed on the horizontal pressure plate and cooperating with the vertical guide sleeve, a floating support plate that rises and falls along the vertical guide rod, a lifting cylinder disposed on the frame for raising and lowering the floating support plate, an end face sealing gasket disposed on the lower surface of the horizontal pressure plate, a sealing column disposed on the lower surface of the end face sealing gasket, a vertical booster pipe with an upper end opening disposed on the horizontal pressure plate, and a connecting pipe connecting the booster pump and the vertical booster pipe with an upper end opening.

[0004] The testing equipment cannot be connected to the production line to continuously test the air tightness of canned food. Summary of the Invention

[0005] To address the above problems, an automatic airtightness detection device for canned food packaging is provided. Through a lower conveyor line, an upper conveyor line, a pressure sealing clamp, an adjustment slide rail and an air pressure detection mechanism, the problem that existing airtightness detection equipment cannot be connected to the production line for continuous detection is solved.

[0006] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0007] An automatic airtightness detection device for canned food packaging, comprising a lower conveyor line for conveying can bodies at equal intervals, and an upper conveyor line arranged on the lower conveyor line, the conveying direction of the top surface of the lower conveyor line is the same as the conveying direction of the bottom surface of the upper conveyor line, and also comprising a pressure sealing clamp, an adjustment slide rail and an air pressure detection mechanism; the pressure sealing clamps are arranged at equal intervals on the conveying surface of the upper conveyor line, and the pressure sealing clamps can form a gradually pressurized sealing cavity on the upper part of the can body; the adjustment slide rails are arranged on the lower conveyor line and the upper conveyor line, and the adjustment slide rails are used to guide the pressure sealing clamp at the bottom of the upper conveyor line to form a gradually pressurized sealing cavity on the upper part of the can body; the air pressure detection mechanism includes a triggering part arranged on the pressure sealing clamp and capable of changing under air pressure, and a detection part arranged on the upper conveyor line for detecting the variable of the triggering part.

[0008] Preferably, the pressure sealing fixture comprises an arch frame, a first clamping platform, a second clamping platform, a first rotating wheel and a second rotating wheel;

[0009] The arches are arranged at equal intervals on the conveying surface of the upper conveyor line, the two sides of the arches are connected to the double conveying surfaces of the upper conveyor line, and the recessed portion of the arches faces the outside of the upper conveyor line; the first clamping platform and the second clamping platform are elastically slidably arranged in the recessed portion of the arches along the width direction of the upper conveyor line, and in the initial state, the distance between the first clamping platform and the second clamping platform is greater than the diameter of the tank body; the first turntable is rotatably arranged on the outside of the first clamping platform; the second turntable is rotatably arranged on the outside of the second clamping platform; the adjusting slide rail includes a first limiting rail, and the first limiting rail is arranged on both sides of the lower conveyor line along the conveying direction of the lower conveyor line, and the first limiting rails on both sides slide with the first turntable and the second turntable, and the first limiting rail is used to guide the first clamping platform and the second clamping platform at the bottom of the upper conveyor line to clamp the tank body radially.

[0010] Preferably, the pressure sealing clamp also includes a first fixing pin and a first spring. The two first fixing pins are respectively arranged on the outside of the first clamping platform and the second clamping platform along the width direction of the upper conveying line. The first spring is sleeved on the first fixing pin, and the two ends of the first spring respectively abut against the outer end of the first fixing pin and the outer side of the arch frame.

[0011] Preferably, a mounting port is provided at the center position of the arch frame, and the pressure sealing fixture also includes a sealing cover and a third rotating wheel. The sealing cover is coaxially and elastically arranged on the mounting port, and the third rotating wheel is radially rotatably arranged on the outer circumference of the sealing cover; the adjusting slide rail also includes a second limiting track, the second limiting track is arranged in the upper conveying line, the second limiting track and the third rotating wheel are slidably matched, and the second limiting track is used to guide the sealing cover at the bottom of the upper conveying line to be coaxially covered with the tank body on the first clamping platform and the second clamping platform, and the trigger part of the air pressure detection mechanism is arranged on the sealing cover and connected to its inner cavity.

[0012] Preferably, the pressure sealing fixture also includes a positioning rod and a second spring. A fixing ear extending radially along the sealing cover is provided at one end of the sealing cover facing the inner side of the upper conveying line. The positioning rod is fixed on the fixing ear coaxially with the sealing cover. The positioning rod passes through the outer end of the sealing cover and slides with it. The second spring is sleeved on the positioning rod, and the two ends of the second spring respectively abut against the opposite ends of the sealing cover and the fixing ear.

[0013] Preferably, a first annular groove coaxial with the sealing cover is provided on the outer circumferential surface thereof, and the pressure sealing fixture further comprises a clamp which is sleeved on the second annular groove, the outer diameter of the clamp being larger than the diameter of the mounting opening, and the clamp is located in the recess of the positioning rod.

[0014] Preferably, the pressure sealing fixture also includes a plug disc, a movable column and a fourth spring. The plug disc is coaxially slidingly arranged in the sealing cover. The movable column coaxially passes through the sealing end of the sealing cover and is fixedly connected to the plug disc. A first limiting ring coaxial with it is provided on the circumferential surface of the movable column. The first limiting ring is located on the outside of the sealing cover. The fourth spring is sleeved on the movable column. The two ends of the fourth spring respectively abut the outer end of the sealing cover and one end of the first limiting ring; the adjusting slide rail also includes a third limiting rail. The third limiting rail is arranged in the upper conveyor line along the conveying direction of the upper conveyor line. The outer end of the movable column slides with the third limiting rail. The third limiting rail guides the plug disc at the bottom of the upper conveyor line to gradually approach the first clamping platform and the second clamping platform.

[0015] Preferably, a second annular groove coaxial with the plug disc is provided on the circumferential surface thereof, and the pressure sealing fixture further comprises a sealing ring which is sleeved on the second annular groove and interference fits with the inner circumferential surface of the sealing cover.

[0016] Preferably, the outer end of the movable column is provided with a semicircular groove coaxial with the same, and the pressure sealing fixture also includes a ball and an internal threaded cylinder. The ball is rotatably arranged in the semicircular groove, and the internal threaded cylinder is coaxially screwed to the outer end of the movable column. The outer end of the second limiting ring is provided with a second limiting ring for keeping the ball rotating in the semicircular groove, and the ball is slidably fitted with the third limiting track.

[0017] Preferably, the trigger part includes a right-angle tube, a second piston and a fifth spring, one end of the right-angle tube is connected to the connecting port, and the other end of the right-angle tube extends vertically toward it to form a wide-mouth section, the second piston is coaxially slidingly arranged in the wide-mouth section, the fifth spring is arranged in the wide-mouth section, and the two ends of the fifth spring respectively abut against the inner sides of the fifth spring and the outer end of the wide-mouth section; the detection part includes a distance sensor, and the detection end of the distance sensor is arranged vertically downward on one side of the upper conveying line, and the distance sensor is located at the top of the expansion end when the sealing chamber is pressurized.

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

[0019] 1. This application is connected to the tank production line through the lower conveyor line. The upper conveyor line, pressure sealing fixture and adjustable slide rail can form a gradually pressurized sealed cavity on the upper part of each tank on the lower conveyor line. At the same time, the air pressure detection mechanism can detect the pressure change in the sealed cavity to determine whether the tank is leaking, which has high detection efficiency.

[0020] 2. The present application can form a stable sealed cavity on the upper part of the tank body through the first clamping platform, the second clamping platform and the sealing cover, and at the same time can pressurize the sealed cavity through the movable plug disc, so as to detect whether the tank body is leaking according to the rising height of the second piston, and the detection accuracy and stability are high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of an automatic airtightness detection device for canned food packaging;

[0022] Figure 2 This is a partial exploded perspective view of an automatic airtightness detection device for canned food packaging;

[0023] Figure 3 It is a side view of an automatic airtightness detection device for canned food packaging;

[0024] Figure 4 yes Figure 3 A three-dimensional cross-sectional view in the BB direction;

[0025] Figure 5 yes Figure 3 Cross-sectional view in the BB direction;

[0026] Figure 6 This is a three-dimensional diagram of a pressure sealing fixture and an adjustment slide rail in an automatic airtightness detection device for canned food packaging from a first viewing angle;

[0027] Figure 7 This is a perspective view of a pressure sealing fixture and an adjustment slide rail in an automatic airtightness detection device for canned food packaging from a second viewing angle;

[0028] Figure 8 It is a three-dimensional view of a pressure sealing fixture in an automatic airtightness detection device for canned food packaging from a first viewing angle;

[0029] Figure 9 This is a perspective view of a pressure sealing fixture used in an automatic airtightness detection device for canned food packaging from a second viewing angle;

[0030] Figure 10 This is a front view of a pressure sealing fixture and an air pressure detection mechanism in an automatic airtightness detection device for canned food packaging;

[0031] Figure 11 yes Figure 10 Cross-sectional view in CC direction;

[0032] Figure 12 yes Figure 11 A partial enlarged view of point D.

[0033] The numbers in the figure are:

[0034] 1- Lower conveyor line;

[0035] 2- Upper conveyor line;

[0036] 3-pressure sealing fixture; 301-arch; 3011-installation port; 302-first clamping platform; 303-second clamping platform; 304-first rotating wheel; 305-second rotating wheel; 306-first fixing pin; 307-first spring; 308-sealing cover; 3081-first ring groove; 3082-fixing ear; 3083-connecting port; 309-third rotating wheel; 310-positioning rod; 311-second spring; 312-clamp; 313-plug disc; 3131-second ring groove; 314-movable column; 3141-first limiting ring; 3142-semicircular groove; 315-fourth spring; 316-sealing ring; 317-ball; 318-internal threaded cylinder; 3181-second limiting ring;

[0037] 4-adjusting slide rail; 401-first limiting rail; 402-second limiting rail; 403-third limiting rail;

[0038] 5-air pressure detection mechanism; 501-right-angle tube; 502-second piston; 503-fifth spring; 504-distance sensor. DETAILED DESCRIPTION

[0039] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 1-12 As shown, this application provides:

[0041] An automatic airtightness detection device for canned food packaging, comprising a lower conveyor line 1 for conveying cans at equal intervals, and an upper conveyor line 2 arranged on the lower conveyor line 1. The conveying direction of the top surface of the lower conveyor line 1 is the same as the conveying direction of the bottom surface of the upper conveyor line 2. The device also includes a pressure sealing fixture 3, an adjustment slide rail 4 and an air pressure detection mechanism 5.

[0042] The pressure sealing fixtures 3 are arranged at equal intervals on the conveying surface of the upper conveying line 2. The pressure sealing fixtures 3 can form a sealing cavity on the upper part of the can body that can be gradually pressurized.

[0043] The adjusting rail 4 is provided on the lower conveyor line 1 and the upper conveyor line 2. The adjusting rail 4 is used to guide the pressure sealing fixture 3 at the bottom of the upper conveyor line 2 to form a gradually pressurized sealing cavity on the upper part of the can body;

[0044] The air pressure detection mechanism 5 includes a triggering portion provided on the pressure sealing fixture 3 and capable of changing under air pressure, and a detection portion provided on the upper conveying line 2 for detecting the variable of the triggering portion.

[0045] The lower conveyor line 1 conveys tanks at equal intervals. When the tanks move between the lower conveyor line 1 and the upper conveyor line 2, the pressure-applying sealing fixture 3, under the action of the adjusting slide rail 4, forms a gradually pressurized sealing cavity on the upper part of the tank. The pressure in the sealing cavity gradually increases. The increase in pressure causes the trigger part of the air pressure detection mechanism 5 to produce a variable, and the size of the variable can be directly observed through the detection part of the air pressure detection mechanism 5.

[0046] When the tank body does not leak, that is, the pressure in the sealed cavity gradually and steadily increases, which makes the variable generated by the trigger part of the air pressure detection mechanism 5 larger. The detection part of the air pressure detection mechanism 5 can directly detect this variable, thereby determining that the tank body is well sealed;

[0047] When the tank body leaks, the pressure in the sealed cavity gradually increases, causing some of the air pressure to overflow into the leaking tank body, thereby making the variable generated by the triggering part of the air pressure detection mechanism 5 smaller. The detection part of the air pressure detection mechanism 5 then detects this variable, thereby determining that the tank body has leaked.

[0048] This application is connected to the tank production line through the lower conveyor line 1, and through the upper conveyor line 2, the pressure sealing clamp 3 and the adjustment slide rail 4, a sealed cavity that can be gradually pressurized can be formed on the upper part of each tank on the lower conveyor line 1. At the same time, the pressure change of the sealed cavity can be detected by the air pressure detection mechanism 5 to determine whether the tank is leaking, and the detection efficiency is high.

[0049] Further:

[0050] The pressure sealing fixture 3 includes an arch 301, a first clamping platform 302, a second clamping platform 303, a first rotating wheel 304 and a second rotating wheel 305;

[0051] The arches 301 are arranged at equal intervals on the conveying surface of the upper conveyor line 2, and both sides of the arches 301 are connected to the double conveying surfaces of the upper conveyor line 2, with the concave portion of the arches 301 facing the outside of the upper conveyor line 2;

[0052] The first clamping platform 302 and the second clamping platform 303 are elastically slidably arranged in the concave portion of the arch 301 along the width direction of the upper conveyor line 2. In the initial state, the distance between the first clamping platform 302 and the second clamping platform 303 is greater than the diameter of the can body;

[0053] The first rotating wheel 304 is rotatably disposed on the outer side of the first clamping platform 302;

[0054] The second rotating wheel 305 is rotatably disposed on the outer side of the second clamping platform 303;

[0055] The adjusting slide rail 4 includes a first limiting rail 401, which is arranged on both sides of the lower conveyor line 1 along the conveying direction of the lower conveyor line 1. The first limiting rails 401 on both sides slide with the first rotating wheel 304 and the second rotating wheel 305. The first limiting rail 401 is used to guide the first clamping platform 302 and the second clamping platform 303 at the bottom of the upper conveyor line 2 to clamp the can body radially.

[0056] When the can bodies on the lower conveyor line 1 move at equal intervals, the pressure sealing clamp 3 at the bottom of the upper conveyor line 2 gradually approaches the can bodies. Before the first rotating wheel 304 and the second rotating wheel 305 enter the first limiting track 401, the distance between the first clamping platform 302 and the second clamping platform 303 is greater than the diameter of the can body, so that the first clamping platform 302 and the second clamping platform 303 move together with the can body therebetween. When the first rotating wheel 304 and the second rotating wheel 305 move into the first limiting track 401, the first clamping platform 302 and the second clamping platform 303 overcome the elastic force and move relative to each other, thereby clamping the can body in the radial direction, thereby clamping the can body in the first limiting track 401. The upper part forms the bottom of the sealed cavity, and the upper conveyor line 2 has two synchronously moving conveyor belts, which can be chain conveyor belts. The two sides of the arch frame 301 are connected to the two conveyor belts of the upper conveyor line 2 to expose the arch frame 301, thereby avoiding the structure used to form a sealed cavity at the top of the first clamping platform 302 and the second clamping platform 303; and when the first rotating wheel 304 and the second rotating wheel 305 are out of the first limiting track 401, the first clamping platform 302 and the second clamping platform 303 move backwards, thereby loosening the can body, so that the upper conveyor line 2 can drive the first clamping platform 302 and the second clamping platform 303 to clamp the can body reciprocatingly.

[0057] Further:

[0058] The pressure sealing fixture 3 also includes a first fixing pin 306 and a first spring 307. The two first fixing pins 306 are respectively arranged on the outside of the first clamping platform 302 and the second clamping platform 303 along the width direction of the upper conveyor line 2. The first spring 307 is mounted on the first fixing pin 306. The two ends of the first spring 307 respectively abut the outer end of the first fixing pin 306 and the outer side of the arch frame 301.

[0059] By fixing the two second rotating wheels 305 on the outside of the first clamping platform 302 and the second clamping platform 303 respectively, the first clamping platform 302 and the second clamping platform 303 can move toward or away from each other in the recess of the arch frame 301. At the same time, by sleeved on the first fixing pin 306, the first clamping platform 302 and the second clamping platform 303 need to overcome the elastic force of the first spring 307 to clamp the tank body radially, so as to facilitate the stable clamping and release of the first clamping platform 302 and the second clamping platform 303.

[0060] Further:

[0061] The arch 301 is provided with a mounting opening 3011 at its center. The pressure sealing fixture 3 further includes a sealing cover 308 and a third rotating wheel 309. The sealing cover 308 is coaxially and elastically provided on the mounting opening 3011. The third rotating wheel 309 is radially and rotatably provided on the outer circumference of the sealing cover 308.

[0062] The adjusting slide rail 4 also includes a second limiting rail 402, which is arranged in the upper conveyor line 2. The second limiting rail 402 slides with the third rotating wheel 309. The second limiting rail 402 is used to guide the sealing cover 308 at the bottom of the upper conveyor line 2 to be coaxial with the tank body and is arranged on the first clamping platform 302 and the second clamping platform 303. The trigger part of the air pressure detection mechanism 5 is arranged on the sealing cover 308 and is connected to its inner cavity.

[0063] By coaxially and elastically setting the sealing cover 308 on the mounting port 3011, when the third rotating wheel 309 has not entered the second limiting track 402, the sealing cover 308 at the bottom of the upper conveyor line 2 is higher than the tank body. When the third rotating wheel 309 enters the second limiting track 402, the sealing cover 308 at the bottom of the upper conveyor line 2 gradually moves downward relative to the arch frame 301, so that the sealing cover 308 can be covered on the first clamping platform 302 and the second clamping platform 303, thereby forming a complete sealing cavity on the upper part of the tank body with the first clamping platform 302 and the second clamping platform 303, so as to detect whether the tank body is leaking by adjusting the pressure of the sealing cavity.

[0064] Further:

[0065] The pressure sealing fixture 3 also includes a positioning rod 310 and a second spring 311. The end of the sealing cover 308 facing the inner side of the upper conveyor line 2 is provided with a fixing ear 3082 extending radially thereof. The positioning rod 310 and the sealing cover 308 are coaxially fixed on the fixing ear 3082. The positioning rod 310 passes through the outer end of the sealing cover 308 and slides with it. The second spring 311 is sleeved on the positioning rod 310, and the two ends of the second spring 311 respectively abut against the opposite ends of the sealing cover 308 and the fixing ear 3082.

[0066] The locking cam 308 is secured to the cam 306 by the spring 312 which secures the cam 306 to the user. The locking cam 306 is secured to the user's cam 306 by the spring 312 which secures the user's cam 306 to the user. The locking cam 306 is secured to the user's cam 306 by the spring 312 which secures the user's cam 306 to the user.

[0067] Further:

[0068] A first annular groove 3081 coaxial with the sealing cover 308 is also provided on the outer circumferential surface thereof. The pressure sealing fixture 3 also includes a clamp 312, which is sleeved on the second annular groove 3131. The outer diameter of the clamp 312 is larger than the diameter of the mounting opening 3011, and the clamp 312 is located in the recess of the positioning rod 310.

[0069] By forming a first annular groove 3081 coaxial with the sealing cover 308 on its outer circumferential surface and sleeve the first clamping platform 302 on the first annular groove 3081, the sealing cover 308 cannot be separated from the installation opening 3011 due to elastic force, thereby improving the stability of the equipment.

[0070] Further:

[0071] The pressure sealing fixture 3 also includes a plug disc 313, a movable column 314 and a fourth spring 315. The plug disc 313 is coaxially slidably arranged in the sealing cover 308. The movable column 314 coaxially passes through the sealing end of the sealing cover 308 and is fixedly connected to the plug disc 313. A first limiting ring 3141 coaxial with it is provided on the circumferential surface of the movable column 314. The first limiting ring 3141 is located on the outer side of the sealing cover 308. The fourth spring 315 is sleeved on the movable column 314. The two ends of the fourth spring 315 respectively abut against the outer end of the sealing cover 308 and one end of the first limiting ring 3141; the adjusting slide rail 4 also includes a third limiting rail 403. The third limiting rail 403 is arranged in the upper conveyor line 2 along the conveying direction of the upper conveyor line 2. The outer end of the movable column 314 slides with the third limiting rail 403. The third limiting rail 403 guides the plug disc 313 at the bottom of the upper conveyor line 2 to gradually approach the first clamping platform 302 and the second clamping platform 303.

[0072] The first limiting ring 3141 is used to accommodate the fourth spring 315, so that the movable column 314 can slide elastically at the closed end of the sealing cover 308. When the top of the movable column 314 has not entered the third limiting track 403, the plug disc 313 abuts against the inner end of the sealing cover 308 under the elastic force of the fourth spring 315. When the sealing cover 308 is covered at the top of the first clamping platform 302 and the second clamping platform 303 and forms a sealed cavity in the upper part of the tank body, and the top of the movable column 314 enters the third limiting track 403, the movable column 314 gradually moves downward, thereby reducing the volume of the sealed cavity and increasing the pressure of the sealed cavity, so that the trigger part of the air pressure detection mechanism 5 can stably detect the pressure change, and the detection part of 05 detects whether the pressure belongs to the leakage state of the tank body.

[0073] Further:

[0074] A second annular groove 3131 coaxial with the plug disc 313 is provided on its circumferential surface. The pressure sealing fixture 3 also includes a sealing ring 316 , which is sleeved on the second annular groove 3131 and interference fits with the inner circumferential surface of the sealing cover 308 .

[0075] By sleeve-mounting the sealing ring 316 on the second annular groove 3131 , the pressure in the sealing cavity can be stably increased, thereby preventing gas from overflowing and improving the stability of the device.

[0076] Further:

[0077] The outer end of the movable column 314 is provided with a semicircular groove 3142 coaxial with it. The pressure sealing fixture 3 also includes a ball 317 and an internal threaded tube 318. The ball 317 is rotatably set in the semicircular groove 3142. The internal threaded tube 318 is coaxially screwed on the outer end of the movable column 314. The outer end of the second limiting ring 3181 is provided with a second limiting ring 3181 to keep the ball 317 rotating in the semicircular groove 3142. The ball 317 slides in cooperation with the third limiting track 403.

[0078] By rotatably setting the ball 317 in the semicircular groove 3142 and screwing it to the movable column 314 through the internal threaded tube 318, the second limiting ring 3181 can prevent the ball 317 from escaping from the semicircular groove 3142, thereby reducing the friction between the top of the movable column 314 and the third limiting rail 403, making the sliding process more stable, thereby improving the stability of the equipment.

[0079] Further:

[0080] The triggering part includes a right-angle tube 501, a second piston 502 and a fifth spring 503. One end of the right-angle tube 501 is connected to the connecting port 3083, and the other end of the right-angle tube 501 extends vertically toward it to form a wide-mouth section. The second piston 502 is coaxially slidingly arranged in the wide-mouth section, and the fifth spring 503 is arranged in the wide-mouth section. The two ends of the fifth spring 503 respectively abut against the inner side of the fifth spring 503 and the outer end of the wide-mouth section; the detection part includes a distance sensor 504, and the detection end of the distance sensor 504 is arranged vertically downward on one side of the upper conveying line 2, and the distance sensor 504 is located at the top of the expansion end when the sealing chamber is pressurized.

[0081] When the pressure in the sealed chamber increases, the gas in the sealed chamber overflows into the right-angle tube 501 through the connecting port 3083, thereby causing the second piston 502 to overcome the elastic force of the fifth spring 503 and rise. The rising height of the second piston 502 can be detected by the distance sensor 504. Due to leakage of the tank body, the pressurized gas in the sealed chamber will overflow into the tank body, resulting in a smaller rising height of the second piston 502. When the tank body is sealed, the gas in the sealed chamber cannot overflow into the tank body, but can only overflow into the right-angle tube 501, resulting in a larger rising height of the second piston 502, which can also be detected by the distance sensor 504, thereby being able to detect whether the tank body on the lower conveyor line 1 is leaking.

[0082] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An automatic air tightness detection device for canned food packaging, comprising a lower conveyor line (1) for conveying cans at equal intervals, and an upper conveyor line (2) arranged on the lower conveyor line (1), wherein the conveying direction of the top surface of the lower conveyor line (1) is the same as the conveying direction of the bottom surface of the upper conveyor line (2), and characterized in that: It also includes a pressure sealing fixture (3), an adjustment slide rail (4) and an air pressure detection mechanism (5); The pressure-applying sealing fixtures (3) are arranged at equal intervals on the conveying surface of the upper conveying line (2), and the pressure-applying sealing fixtures (3) can form a gradually pressurized sealed cavity on the upper part of the tank body; The adjusting slide rail (4) is arranged on the lower conveying line (1) and the upper conveying line (2), and the adjusting slide rail (4) is used to guide the pressure sealing clamp (3) at the bottom of the upper conveying line (2) to form a gradually pressurized sealing cavity at the upper part of the tank body; The air pressure detection mechanism (5) comprises a triggering part arranged on the pressure-applying sealing fixture (3) and capable of changing under the guidance of air pressure, and a detection part arranged on the upper conveying line (2) for detecting the variable of the triggering part; The pressure sealing fixture (3) comprises an arch frame (301), a first clamping platform (302), a second clamping platform (303), a first rotating wheel (304) and a second rotating wheel (305); The arches (301) are arranged at equal intervals on the conveying surface of the upper conveying line (2), the two sides of the arches (301) are connected to the double conveying surfaces of the upper conveying line (2), and the concave portion of the arches (301) faces the outside of the upper conveying line (2); The first clamping platform (302) and the second clamping platform (303) are elastically slidably arranged in the recessed portion of the arch frame (301) along the width direction of the upper conveying line (2); in an initial state, the distance between the first clamping platform (302) and the second clamping platform (303) is greater than the diameter of the can body; The first rotating wheel (304) is rotatably disposed on the outer side of the first clamping platform (302); The second rotating wheel (305) is rotatably disposed on the outer side of the second clamping platform (303); The adjusting slide rail (4) comprises a first limiting rail (401), the first limiting rail (401) being arranged on both sides of the lower conveying line (1) along the conveying direction of the lower conveying line (1), the first limiting rails (401) on both sides being slidably matched with the first rotating wheel (304) and the second rotating wheel (305), the first limiting rail (401) being used to guide the first clamping platform (302) and the second clamping platform (303) at the bottom of the upper conveying line (2) to clamp the can body in the radial direction; A mounting opening (3011) is provided at the center of the arch frame (301), and the pressure sealing fixture (3) further comprises a sealing cover (308) and a third rotating wheel (309), wherein the sealing cover (308) is coaxially elastically arranged on the mounting opening (3011), and the third rotating wheel (309) is radially rotatably arranged on the outer circumferential surface of the sealing cover (308); The adjusting slide rail (4) further comprises a second limiting rail (402), the second limiting rail (402) being arranged in the upper conveying line (2), the second limiting rail (402) being slidably matched with the third rotating wheel (309), the second limiting rail (402) being used to guide the sealing cover (308) at the bottom of the upper conveying line (2) to be coaxially covered with the tank body and arranged on the first clamping platform (302) and the second clamping platform (303), and the triggering part of the air pressure detection mechanism (5) being arranged on the sealing cover (308) and communicating with the inner cavity thereof; The pressure sealing fixture (3) further comprises a plug disc (313), a movable column (314) and a fourth spring (315); the plug disc (313) is coaxially slidably arranged in the sealing cover (308); the movable column (314) coaxially penetrates the sealing end of the sealing cover (308) and is fixedly connected to the plug disc (313); a first limiting ring (3141) coaxial with the movable column (314) is arranged on the circumferential surface of the movable column (314); the first limiting ring (3141) is located on the outer side of the sealing cover (308); the fourth spring (315) is sleeved on the movable column (314); The two ends of the four springs (315) are respectively abutted against the outer end of the sealing cover (308) and one end of the first limiting ring (3141); the adjusting slide rail (4) further comprises a third limiting rail (403), the third limiting rail (403) being arranged in the upper conveying line (2) along the conveying direction of the upper conveying line (2); the outer end of the movable column (314) is slidably matched with the third limiting rail (403), and the third limiting rail (403) guides the plug disc (313) at the bottom of the upper conveying line (2) to gradually approach the first clamping platform (302) and the second clamping platform (303); The triggering part comprises a right-angle tube (501), a second piston (502) and a fifth spring (503); one end of the right-angle tube (501) is connected to the connecting port (3083); the other end of the right-angle tube (501) extends vertically toward the connecting port (3083) to form a wide-mouth section; the second piston (502) is coaxially slidably arranged in the wide-mouth section; the fifth spring (503) is arranged in the wide-mouth section; the two ends of the fifth spring (503) respectively abut against the inner sides of the fifth spring (503) and the outer end of the wide-mouth section; the detecting part comprises a distance sensor (504); the detecting end of the distance sensor (504) is arranged vertically downward on one side of the upper conveying line (2); the distance sensor (504) is located at the top of the expansion end when the sealing chamber is pressurized.

2. The automatic airtightness detection device for canned food packaging according to claim 1, characterized in that: The pressure sealing fixture (3) further comprises a first fixing pin (306) and a first spring (307). The two first fixing pins (306) are respectively arranged on the outside of the first clamping platform (302) and the second clamping platform (303) along the width direction of the upper conveyor line (2). The first spring (307) is sleeved on the first fixing pin (306). The two ends of the first spring (307) respectively abut against the outer end of the first fixing pin (306) and the outer side of the arch frame (301).

3. The automatic airtightness detection device for canned food packaging according to claim 1, characterized in that: The pressure sealing fixture (3) further comprises a positioning rod (310) and a second spring (311); one end of the sealing cover (308) facing the inner side of the upper conveying line (2) is provided with a fixing ear (3082) extending in its radial direction; the positioning rod (310) and the sealing cover (308) are fixedly arranged on the fixing ear (3082) coaxially; the positioning rod (310) passes through the outer end of the sealing cover (308) and is slidably engaged therewith; the second spring (311) is sleeved on the positioning rod (310); and the two ends of the second spring (311) are respectively abutted against the opposite ends of 301 and the fixing ear (3082).

4. The automatic airtightness detection device for canned food packaging according to claim 1, characterized in that: A first annular groove (3081) coaxial with the sealing cover (308) is also provided on the outer circumferential surface thereof. The pressure sealing fixture (3) further comprises a clamp (312) which is sleeved on the second annular groove (3131). The outer diameter of the clamp (312) is greater than the diameter of the mounting opening (3011). The clamp (312) is located in a recessed portion of the positioning rod (310).

5. The automatic airtightness detection device for canned food packaging according to claim 1, characterized in that: A second annular groove (3131) coaxial with the plug disc (313) is provided on the circumferential surface thereof. The pressure sealing fixture (3) further comprises a sealing ring (316) which is sleeved on the second annular groove (3131) and is interference fit with the inner circumferential surface of the sealing cover (308).

6. The automatic airtightness detection device for canned food packaging according to claim 1, characterized in that: The outer end of the movable column (314) is provided with a semicircular groove (3142) coaxial therewith. The pressure sealing fixture (3) further comprises a ball (317) and an internal threaded tube (318). The ball (317) is rotatably arranged in the semicircular groove (3142). The internal threaded tube (318) is coaxially screwed to the outer end of the movable column (314). The outer end of the second limiting ring (3181) is provided with a second limiting ring (3181) for keeping the ball (317) rotating in the semicircular groove (3142). The ball (317) is slidably matched with the third limiting track (403).

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