A square can leak detection machine

Abstract

The utility model discloses a square jar leak detection machine, including frame, square jar feed mechanism, square jar detection mechanism and square jar feed mechanism, square jar feed mechanism, square jar detection mechanism and square jar feed mechanism are installed in frame along the conveying direction of square jar in proper order, its characterized in that: square jar detection mechanism includes detection turntable, the first rotation drive arrangement of the detection turntable rotation of can drive, a plurality of jar supporting device and a plurality of blow leak detection device, square jar feed mechanism includes jar inlet conveying belt, jar inlet arc guide plate, jar inlet adapter star dish, jar dial, second rotation drive arrangement and third rotation drive arrangement, and the jar leak detection machine is equipped with jar rejection device on square jar feed mechanism. This square jar leak detection machine can continuously seal effect detection to square jar, is applicable to various height different square jar, will not cause damage to square jar.

Description

Technical Field

[0001] This utility model relates to the field of can-making technology, and in particular to a leak detection machine for square cans. Background Technology

[0002] For leak detection of square cans used for food, leak detection equipment is typically used. Currently, to transport the square cans to the leak detection equipment, a method of feeding cans one by one using a separate screw conveyor is commonly used. For example, a double-spiral can conveying mechanism for a food square can leak detection machine disclosed in CN213230287U (published on May 18, 2021) is characterized by comprising a frame, a drive unit, a transmission unit, a first spiral conveyor, a linkage unit, and a second spiral conveyor. The drive unit, transmission unit, first spiral conveyor, linkage unit, and second spiral conveyor are respectively mounted on the frame. The drive unit, transmission unit, first spiral conveyor, linkage unit, and second spiral conveyor are connected sequentially. The first spiral conveyor and the second spiral conveyor are arranged in parallel and rotate in opposite directions, forming multiple food square can conveying spaces between the first spiral conveyor and the second spiral conveyor. While this double-helix can convey cans one by one, the structure and working principle of the can-separating screw mean that when pushing cans with lower heights, the contact area between the helical blades on the screw and the side wall of the can is small. This makes it difficult to accurately control the position and orientation of the cans, causing the helical blades to fail to push the cans smoothly during rotation. This can lead to cans shifting, jamming, or jumping during transport, resulting in discontinuous inspection and reduced efficiency. Secondly, because there is direct mechanical contact between the can-separating screw and the can, and the rotation and pushing action of the screw are relatively rigid during transport, the surface of the can, especially the opening edge, is easily damaged, compromising the sealing performance and causing air leakage. Furthermore, the structure of this can-separating screw is relatively complex, making adjustments or replacements cumbersome, time-consuming, and costly. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a square can leak detector that can continuously test the sealing effect of square cans, is suitable for square cans of various heights, and will not cause damage to the square cans.

[0004] To solve the above technical problems, the following technical solution is adopted: A square can leak detector includes a frame, a square can feeding mechanism, a square can detection mechanism, and a square can dispensing mechanism. The square can feeding mechanism, square can detection mechanism, and square can dispensing mechanism are sequentially mounted on the frame along the conveying direction of the square cans. The square can detection mechanism includes a detection turntable, a first rotation drive device capable of driving the detection turntable to rotate, multiple can-supporting devices, and multiple air pressure leak detection devices. The first rotation drive device is mounted on the frame. The number of can-supporting devices and air pressure leak detection devices are the same and correspond one-to-one. Each can-supporting device and each air pressure leak detection device is arranged circumferentially along the detection turntable. The square can feeding mechanism includes an inlet conveyor belt, an inlet arc-shaped guide plate, an inlet transfer star disk, a can-dispensing turntable, a second rotation drive device capable of driving the inlet transfer star disk to rotate, and a second rotation drive device capable of driving the can-supporting turntable to rotate. The third rotation drive device for rotating the can-dispensing turntable, the can-feeding conveyor belt, the can-feeding arc-shaped guide plate, the second rotation drive device, and the third rotation drive device are respectively mounted on the frame; a transfer can-feeding station is provided at the rear end of the can-feeding conveyor belt, and a detection can-feeding station is provided on the detection turntable. The can-feeding transfer star disk is located between the transfer can-feeding station and the detection can-feeding station. The can-feeding arc-shaped guide plate extends from the transfer can-feeding station to the detection can-feeding station and matches the contour of the can-feeding transfer star disk. A first base plate for supporting the square can is provided below the can-feeding transfer star disk or the can-feeding arc-shaped guide plate; the can-dispensing turntable is located at the rear end of the can-feeding conveyor belt, and the can-dispensing turntable and the can-feeding transfer star disk are respectively located on both sides of the can-feeding conveyor belt. The linear velocity of the can-dispensing turntable and the can-feeding transfer star disk is the same; a leaky can rejection device is provided on the square can delivery mechanism.

[0005] In operation, the aforementioned square can leak detector transports each square can to be tested along the inlet conveyor belt. When a can moves to the rear end of the conveyor belt, it is separated from the cans in front by the rotating can-distributing turntable, thus separating the cans. As the turntable rotates, the can comes into contact with the edge of the inlet arc-shaped guide plate. At this point, the guide plate, instead of the turntable, limits one side of the can until the entire can enters the machine. The machine continues until the can reaches the position corresponding to the detection turntable, at which point the can is detected. The can-introducing transfer plate pushes the square cans onto the can-supporting device; as the testing turntable rotates continuously, each square can enters its respective can-supporting device, and upon reaching the testing station, the corresponding air pressure leak detection device performs an air pressure test on the corresponding square can; the square cans that have completed the test move with the testing turntable to the square can delivery mechanism, and then enter the square can delivery mechanism for continued transport; finally, the good square cans that do not leak are delivered with the square can delivery mechanism, while the defective square cans that leak are rejected from the square can delivery mechanism by the leak can rejection device. This square can leak detector can send square cans one by one from the square can feeding mechanism to the detection turntable. It can first use the can-dividing turntable for auxiliary can separation, and then use the can-entry transfer star plate for locking and pushing, along with the can-entry arc guide plate, to smoothly send the square cans into the can-supporting device on the detection turntable. There are no requirements for the height of the square cans during the entire transportation process, and it is suitable for square cans of various heights. At the same time, through the locking and pushing method, the position of the square cans can be precisely limited, without causing damage to the square cans, so as to achieve continuous transportation and testing of square cans. Secondly, compared to round tanks with their smooth, continuous sides, which allow for rapid leak detection via rotation and the use of ring sensors or probes, square tanks, due to their geometric complexity and multiple edges, cannot be quickly scanned by rotation. Therefore, scanning requires multi-station fixed detection or multi-angle scanning by robotic arms, resulting in more complex equipment structures, greater difficulty, and higher costs. Thus, air pressure testing is more suitable for leak detection of square tanks. This detection method is simple and economical. However, it also places more stringent requirements on the transport of the square tanks. Therefore, using the aforementioned transport structure to transport the square tanks maximizes their protective function, complementing air pressure testing.

[0006] In a preferred embodiment, the can-feeding transfer star disk has multiple outwardly protruding first locking blocks along its circumference. Between adjacent first locking blocks is a first recessed portion concave towards the center, with a flat bottom. Two adjacent first locking blocks and the first recessed portion form a first square can positioning notch. The first square can positioning notch and the can-feeding arc-shaped guide plate together form a first square can accommodating space. The can-dispensing turntable has multiple outwardly protruding dispensing blocks along its circumference. Adjacent dispensing blocks form a second square can positioning notch. At the can-feeding transfer station, a dispensing block on the can-dispensing turntable corresponds to a first locking block on the can-feeding transfer star disk. Typically, both the first and second square can positioning notches are matched to the length of the square can. When the square can moves to the rear end of the can-feeding conveyor belt, along the rotation direction of the can-turning turntable, the front of the can-feeding block can block the front end of the square can, slowing down the speed of the square can and causing it to be offset from the square can in front, thus playing a role in separating the cans. Secondly, the front and rear ends of one side of the square can in the second square can positioning notch will be locked by the blocks, while the front end of the other side will also be locked by the first locking block of the can-feeding transition star plate. At this time, the can-turning turntable plays an auxiliary clamping role. As the can-turning turntable rotates, the square can will be pushed into the first square can positioning notch under the action of the can-feeding conveyor belt and the blocks, and will contact the edge of the can-feeding arc guide plate. At this time, the can-feeding arc guide plate replaces the blocks of the can-turning turntable to limit one side of the square can until the square can is completely entered into the first square can receiving space and moves along the can-feeding arc guide plate.

[0007] In a preferred embodiment, the square can delivery mechanism includes an outlet conveyor belt, an outlet arc-shaped guide plate, an outlet transfer star disk, and a fourth rotation drive device capable of driving the outlet transfer star disk to rotate. The outlet conveyor belt, the outlet arc-shaped guide plate, and the fourth rotation drive device are respectively mounted on the frame. The detection turntable has an outlet detection station, and the front end of the outlet conveyor belt has an outlet transfer station. The outlet transfer star disk is located between the outlet detection station and the outlet transfer station, and the outlet arc-shaped guide plate extends from the outlet detection station. The can is moved to the can-outlet station and its outline matches that of the can-outlet transfer star disk. A second base plate is provided below the can-outlet transfer star disk or the can-outlet arc-shaped guide plate to support the square can. Multiple outwardly protruding second locking blocks are provided circumferentially on the can-outlet transfer star disk. Between adjacent second locking blocks is a second recessed portion that curves inward towards the center. The bottom of the second recessed portion is flat. Two adjacent second locking blocks and second recessed portions form a third can-outlet locking notch. The third can-outlet locking notch and the can-outlet arc-shaped guide plate form a second square can receiving space. When the square can completes its inspection and needs to be sent out, as the inspection turntable rotates, the square can on the can-supporting device first locks into the third can-outlet locking notch, and then, as the can-outlet transfer star disk rotates, enters the second square can receiving space. It then moves along the can-outlet arc-shaped guide plate until it is released from the constraint of the can-outlet arc-shaped guide plate and is pushed onto the can-outlet conveyor belt by the second locking blocks, allowing the inspected square can to be sent out along the can-outlet conveyor belt. Similarly, this process does not damage the square can.

[0008] Typically, the inlet conveyor belt and the outlet conveyor belt can be a continuous conveyor belt, separated by an inlet arc guide plate and an outlet arc guide plate.

[0009] In a further preferred embodiment, the leaking can rejection device employs an air blowing device, which includes a high-pressure air source, a blowing nozzle, and a valve controlling the connection between the blowing nozzle and the air source. The blowing nozzle is connected to the outlet of the high-pressure air source and is positioned on one side of the can-exit conveyor belt, facing the conveyor belt. A rejection channel is provided on the other side of the can-exit conveyor belt. When a defective square can passes the blowing nozzle from the can-exit conveyor belt, the valve opens, and high-pressure gas is introduced into the blowing nozzle, blowing the defective square can from the can-exit conveyor belt towards the rejection channel for discharge.

[0010] In a preferred embodiment, the air pressure leak detection device includes a sealing cover plate with an air extraction port, and the can support device includes a can support tray with the sealing cover plate positioned above the corresponding can support tray. The square can detection mechanism also includes a driving component capable of driving the can support device. When the can-supporting device rotates with the detection turntable to the position corresponding to the delivery end of the square can feeding mechanism, the can-supporting device, driven by the drive component, lowers the can-supporting plate to the same height as the square can feeding mechanism. At this time, the square can is pushed onto the can-supporting plate by the can-introducing transfer star disk. As the detection turntable continues to rotate, the can-supporting device gradually moves away from the square can feeding mechanism. At this time, driven by the drive component, the can-supporting device drives the can-supporting plate and the square can to rise together, so that the opening of the square can contacts the sealing cover and is sealed by the sealing cover. Then, the air pressure leak detection device can draw air into the square can through the air extraction port to create a vacuum state in the square can. Subsequently, the air pressure change can be detected to confirm the air leakage of the square can. When the square can that has completed the test moves with the detection turntable to the position corresponding to the delivery end of the square can feeding mechanism, the can-supporting device, driven by the drive component, lowers the can-supporting plate to the same height as the square can feeding mechanism. At this time, the square can on the can-supporting plate can be taken out and sent away by the square can feeding mechanism. This structure allows the square tank to be moved up and down between the infeed / outfeed and sealing inspection stations during the testing process by lifting the tank tray. This ensures that the square tank can move smoothly without getting stuck when feeding or discharging materials, and can contact the sealing cover for sealing during leak detection. The entire process will not cause any damage to the square tank.

[0011] In a further preferred embodiment, the air pressure leak detection device further includes an air pump, an air extraction pipe, a solenoid valve, and a detection pipe. The air pump is mounted on the detection turntable and has an air extraction port and a detection port. The air extraction port of the air pump is connected to the air extraction port of the corresponding sealing cover plate through the air extraction pipe, and the detection port is connected to one end of the detection pipe through the solenoid valve. The square tank leak detector also includes a follow-up turntable, a fixed plate, and at least one vacuum sensor. The follow-up turntable is coaxially arranged with the detection turntable and has multiple first detection channels, the same number as the air pressure leak detection device. The other end of the detection pipe is connected to one end of the corresponding first detection channel. The surface of the fixed plate seals the other end of the first detection channel, and the fixed plate has at least one second detection channel, the second detection channel corresponding to the position of the first detection channel. The number of vacuum sensors is the same as the number of second detection channels and they correspond one-to-one. The vacuum sensors are installed in the corresponding second detection channels. The air pump extracts air from the square tank through the air extraction pipe. Typically, the fixed plate has two second detection channels. One second detection channel corresponds to the output end of the can feeding mechanism along the rotation direction of the detection turntable, and the other second detection channel corresponds to the input end of the can feeding mechanism along the rotation direction of the detection turntable. After the can is evacuated, the first detection channel on the follower turntable connects with the first second detection channel. At this time, the solenoid valve opens, connecting the detection port with the detection tube, and the vacuum sensor performs the first detection on the can. Subsequently, the detection turntable drives the can to rotate, and the other first detection channels connect with the first second detection channel, and so on in a cycle. When the can rotates to the second detection station after the first detection, the first detection channel connects with the second second detection channel, and the vacuum sensor performs the second detection on the can. By comparing the two detection results, it can be determined whether the can is leaking.

[0012] In a further preferred embodiment, the can-holding device further includes a swing arm, rollers, a lifting seat, and at least one elastic support unit. The first end of the swing arm is hinged to the detection turntable, and the second end of the swing arm is hinged to the lifting seat. The rollers are rotatably mounted on the second end of the swing arm. The elastic support unit is vertically movable on the detection turntable, with its lower end connected to the lifting seat and its upper end connected to the can-holding tray. The driving component is a cam guide rail with a protruding section. The cam guide rail is fixedly mounted on the frame, and the rotation trajectory of the cam guide rail and the rollers matches the rotation trajectory of the detection turntable. The square can feeding mechanism and the square can discharging mechanism correspond to the positions of the protruding sections of the cam guide rail, respectively. When each can-supporting device rotates with the detection turntable and moves to the corresponding position of the square can feeding mechanism or the square can dispensing mechanism, the roller moves along the cam guide rail to the corresponding protruding section. At this time, under the action of the protruding section of the cam guide rail, the second end of the swing arm swings downward and drives the lifting seat to descend, thereby pulling the can-supporting plate down through the elastic support unit, so that the can-supporting plate descends to the same height as the square can feeding mechanism or the square can dispensing mechanism. When the roller leaves the protruding section of the cam guide rail, the can-supporting plate, the lifting seat and the second end of the swing arm can move upward again under the action of the elastic support unit, so that the square can on the can-supporting plate can be sealed by the sealing cover.

[0013] In a further preferred embodiment, the detection turntable has multiple guide holes. The elastic support unit includes guide support rods and compression springs. The number of guide support rods is the same as the number of guide holes, and they correspond one-to-one. The guide support rods can move up and down through the corresponding guide holes. The upper end of the guide support rod is connected to the can support tray, and the lower end of the guide support rod is connected to the lifting seat. The compression spring is sleeved on the guide support rod, and the upper end of the compression spring is connected to or in close contact with the can support tray, and the lower end of the compression spring is connected to or in close contact with the detection turntable. When the roller moves to the protruding section of the cam guide rail, the second end of the swing arm swings downward and drives the lifting seat to descend. At this time, the guide support rod is pulled and also moves downward, thereby driving the can support tray to descend, and the compression spring is in a compressed state. When the roller leaves the protruding section of the cam guide rail, the can support tray is lifted up under the action of the compression spring, thereby driving the guide support rod to move upward, and driving the lifting seat and the second end of the swing arm to move upward accordingly.

[0014] In a further preferred embodiment, the elastic support unit further includes a limiting block and a buffer pad, which are respectively fitted onto the guide support rod. The lower surface of the buffer pad contacts the upper surface of the lifting seat, and the lower surface of the limiting block contacts the upper surface of the buffer pad. The size of the limiting block is larger than the guide hole. By setting the limiting block, the guide support rod can be prevented from gradually detaching from the lifting seat due to impact during long-term up-and-down movement. The buffer pad also plays a buffering role, reducing the impact on the guide support rod and the lifting seat.

[0015] In a further preferred embodiment, along the rotation direction of the detection turntable, the protruding section of the cam guide extends from the can delivery mechanism to the can inlet mechanism. When the can tray moves to the position corresponding to the can delivery mechanism to unload the can, it can remain in the lowered position until the can is reloaded at the can inlet mechanism.

[0016] In a further preferred embodiment, the lower surface of the sealing cover is provided with a sealing rubber disc. When the can support tray lifts the square can upwards, the opening edge of the square can can contact the sealing rubber disc, which can both ensure that the opening of the square can is sealed and will not damage the opening edge of the square can.

[0017] The beneficial effects of this utility model are as follows: this square can leak detector can continuously test the sealing effect of square cans, and can ensure the testing effect without damaging the square cans. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the square tank leak detector in this embodiment of the present invention; Figure 2 This is a top view of the square tank leak detector in this embodiment of the present invention; Figure 3 A sectional view of the square can detection mechanism, the square can feeding mechanism, and the square can dispensing mechanism (for ease of identification, the square can detection mechanism, the square can feeding mechanism, and the square can dispensing mechanism are offset vertically in this sectional view, with the can inlet adapter star plate and the can dispensing turntable offset horizontally). Figure 4 This is a cross-sectional view of the square tank detection mechanism and the air pressure leak detection device in the embodiment of this utility model; Figure 5 This is an enlarged view of the square can feeding mechanism in an embodiment of this utility model; Figure 6 This is an enlarged view of the square can delivery mechanism in an embodiment of this utility model; Figure 7 This is a schematic diagram of the drive unit, the can-supporting device, and the air pressure leak detection device when the can-supporting tray descends in this embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the can-supporting device and the air pressure leak detection device when the can-supporting tray rises in this embodiment of the present invention; Figure 9 for Figure 8 A cross-sectional view along direction A. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figure 1-9The illustrated square can leak detector includes a frame 1, a square can feeding mechanism 2, a square can detection mechanism 3, and a square can delivery mechanism 4. The square can feeding mechanism 2, the square can detection mechanism 3, and the square can delivery mechanism 4 are sequentially mounted on the frame 1 along the conveying direction of the square cans. The square can detection mechanism 3 includes a detection turntable 301, a first rotation drive device 302 capable of driving the detection turntable 301 to rotate, multiple can-supporting devices 303, and multiple air pressure leak detection devices 304. The first rotation drive device 302 is mounted on the frame 1. The number of can-supporting devices 303 and air pressure leak detection devices 304 are the same and correspond one-to-one. Each can-supporting device 303 and each air pressure leak detection device 304... The square can feeding mechanism 2 includes an inlet conveyor belt 201, an inlet arc-shaped guide plate 202, an inlet transfer star disk 203, a can-turning turntable 204, a second rotation drive device 205 capable of driving the inlet transfer star disk 203 to rotate, and a third rotation drive device 206 capable of driving the can-turning turntable 204 to rotate. The inlet conveyor belt 201, the inlet arc-shaped guide plate 202, the second rotation drive device 205, and the third rotation drive device 206 are respectively mounted on the frame 1. The rear end of the inlet conveyor belt 201 is provided with a transfer inlet station, and the detection turntable 301 is provided with a detection inlet station. The inlet transfer star disk 203 is also provided with a transfer inlet station. Located between the transfer tank entry station and the inspection tank entry station, the tank entry arc-shaped guide plate 202 extends from the transfer tank entry station to the inspection tank entry station and matches the contour of the tank entry transfer star plate 203. Below the tank entry arc-shaped guide plate 202 is a first base plate 2021 for supporting the square tank. The tank entry transfer star plate 203 has multiple outwardly protruding first locking blocks 2031 along its circumferential direction. Between adjacent first locking blocks 2031 is a first recessed portion that is concave towards the center. The bottom of the first recessed portion is flat. Two adjacent first locking blocks 2031 and the first recessed portion form a first square tank locking notch 2032. The first square tank locking notch 2032 and the tank entry arc-shaped guide plate... The space between 202 forms the first can-accommodating space; the can-turning turntable 204 is located at the rear end of the can-infeed conveyor belt 201, and the can-turning turntable 204 and the can-infeed transfer star disk 203 are respectively located on both sides of the can-infeed conveyor belt 201. The can-turning turntable 204 has multiple outwardly protruding paddles 2041 along its circumference. The adjacent paddles 2041 form the second can-positioning notch 2042. At the can-infeeding station, a paddle 2041 on the can-turning turntable 204 corresponds to a first locking block 2031 on the can-infeed transfer star disk 203. The linear velocities of the can-turning turntable 204 and the can-infeed transfer star disk 203 are the same; the can-outfeeding mechanism 4 is equipped with a leaking can rejection device 5.

[0020] The first square tank positioning notch 2032 and the second square tank positioning notch 2042 mentioned above both match the length of the square tank. When the aforementioned square can leak detector is in use, each square can to be tested is conveyed along the inlet conveyor belt 201. When the square can moves to the rear end of the inlet conveyor belt 201, along the rotation direction of the can-shifting turntable 204, the front-positioned paddle block 2041 on the turntable 204 can block the front end of the square can, slowing down the speed of the square can and causing it to be misaligned with the square can in front, thus separating the cans. Secondly, the square can in the second square can locking notch 2042 will have its front and rear ends on one side locked by the paddle block 2041, while the front end on the other side will be locked by the first locking block 2031 of the inlet transition star plate 203. At this time, the can-shifting turntable 204 plays an auxiliary clamping role. As the can-shifting turntable 204 rotates, the square can will be pushed into the first square can locking notch 2032 under the action of the inlet conveyor belt 201 and the paddle block 2041, and will contact the edge of the inlet arc guide plate 202. Upon contact, the can-feeding arc guide plate 202 replaces the can-pulling block 2041 of the can-pulling turntable 204 to limit one side of the square can until the entire square can enters the first square can receiving space and moves along the can-feeding arc guide plate 202. When it reaches the position corresponding to the detection turntable 301, the first locking block 2031 of the can-feeding transfer star plate 203 pushes the square can onto the can-supporting device 303. As the detection turntable 301 rotates continuously, each square can will enter its respective can-supporting device 303, and the corresponding air pressure leak detection device 304 will perform air pressure detection on the corresponding square can. The square can that has completed the detection moves with the detection turntable 301 to the square can delivery mechanism 4 and then enters the square can delivery mechanism 4 for continued conveying. Finally, the good square cans that do not leak can be delivered with the square can delivery mechanism 4, while the defective square cans that leak will be rejected from the square can delivery mechanism 4 by the leak can rejection device 5. This square can leak detector can send square cans one by one from the square can feeding mechanism 2 to the detection turntable 301. First, the can-splitting turntable 204 separates and assists in clamping the square cans, pushing them into the first square can clamping notch 2032. Then, through the engagement and pushing of the can-entry transfer star disk 203, and with the help of the can-entry arc guide plate 202, the square can is smoothly sent into the can-supporting device 303 on the detection turntable 301. There are no requirements for the height of the square cans during the entire transportation process, making it suitable for square cans of various heights. At the same time, through the clamping and pushing method, the position of the square can can be precisely limited, without causing damage to the square cans, thus enabling continuous transportation and testing of square cans.Secondly, compared to round tanks with their smooth, continuous sides, which allow for rapid leak detection by rotation and the use of ring sensors or probes, square tanks, due to their geometric complexity and multiple edges, cannot be quickly scanned by rotation. Therefore, scanning methods require multi-station fixed detection or multi-angle scanning by robotic arms, resulting in more complex equipment structures, greater difficulty, and higher costs. Thus, air pressure testing is more suitable for leak detection of square tanks. This detection method is simple and economical. However, it also places more stringent requirements on the transportation of the square tanks. Therefore, using the aforementioned transportation structure to transport the square tanks maximizes their protective function, complementing air pressure testing.

[0021] The square can delivery mechanism 4 includes a can delivery conveyor belt 401, a can delivery arc-shaped guide plate 402, a can delivery transfer star disk 403, and a fourth rotation drive device 404 capable of driving the can delivery transfer star disk 403 to rotate. The can delivery conveyor belt 401, the can delivery arc-shaped guide plate 402, and the fourth rotation drive device 404 are respectively mounted on the frame 1. The detection turntable 301 is provided with a detection can delivery station, and the front end of the can delivery conveyor belt 401 is provided with a transfer can delivery station. The can delivery transfer star disk 403 is located between the detection can delivery station and the transfer can delivery station. The can delivery arc-shaped guide plate 402 extends from the detection can delivery station to the turntable 301. The can-exit station matches the outline of the can-exit transfer star disk 403. Below the can-exit arc guide plate 402, there is a second base plate 4021 for supporting the square can. The can-exit transfer star disk 403 has multiple outwardly protruding second locking blocks 4031 along the circumferential direction. Between adjacent second locking blocks 4031, there is a second recessed part that is recessed towards the center. The bottom of the second recessed part is flat. Two adjacent second locking blocks 4031 and the second recessed part form a third can-exit locking notch 4032. The third can-exit locking notch 4032 and the can-exit arc guide plate 402 form a second square can-accommodating space. When the square can completes its inspection and needs to be sent out, as the inspection turntable 301 rotates, the square can on the can support device 303 first engages with the third square can locking notch 4032, and then, as the can exit transfer star disk 403 rotates, enters the second square can receiving space. It then moves along the can exit arc-shaped guide plate 402 until it is released from the constraint of the can exit arc-shaped guide plate 402 and is pushed onto the can exit conveyor belt 401 by the second locking block 4031, allowing the inspected square can to be sent out along the can exit conveyor belt 401. Similarly, this process does not damage the square can.

[0022] The inlet conveyor belt 201 and the outlet conveyor belt 401 can be a continuous conveyor belt, separated by the inlet arc guide plate 202 and the outlet arc guide plate 402.

[0023] The leaking can rejection device 5 employs an air blowing device, which includes a high-pressure air source, a blowing nozzle, and a valve controlling the connection between the blowing nozzle and the can. The blowing nozzle is connected to the outlet of the high-pressure air source and is positioned on one side of the can-exit conveyor belt 401, facing the can-exit conveyor belt 401. A rejection channel is provided on the other side of the can-exit conveyor belt 401. When a defective square can passes the blowing nozzle from the can-exit conveyor belt 401, the valve opens, and high-pressure gas is introduced into the blowing nozzle, blowing the defective square can from the can-exit conveyor belt 401 towards the rejection channel for discharge.

[0024] The air pressure leak detection device 304 includes a sealing cover plate 3041 with an air extraction port. The can support device 303 includes a can support tray 3031, with the sealing cover plate 3041 positioned above the corresponding can support tray 3031. The square can detection mechanism 3 also includes a driving member 305 that can drive the can support device 303. When the can support device 303 rotates to a position corresponding to the square can feeding mechanism 2 or the square can discharging mechanism 4, the driving member 305 can drive the can support device 303 to lower the can support tray 3031 to the same height as the square can feeding mechanism 2 or the square can discharging mechanism 4. When the can support device 303 moves away from the square can feeding mechanism 2 or the square can discharging mechanism 4, the driving member 305 can drive the can support device 303 to raise the can support tray 3031 and bring it closer to the sealing cover plate 3041. When the can-supporting device 303 rotates with the detection turntable 301 to a position corresponding to the delivery end of the square can feeding mechanism 2, the can-supporting device 303, driven by the driving component 305, will cause the can-supporting plate 3031 to descend to the same height as the square can feeding mechanism 2. At this time, the square can will be pushed and transferred to the can-supporting plate 3031 by the can-infeeding transfer star disk 203. As the detection turntable 301 continues to rotate, the can-supporting device 303 gradually moves away from the square can feeding mechanism 2. At this time, driven by the driving component 305, the can-supporting device 303 will drive the can-supporting plate 3031 and the square can to rise together, so that the opening of the square can is aligned with the... The sealing cover 3041 contacts and seals the container; then the air pressure leak detection device 304 can draw air into the container through the suction port to create a vacuum state. The leakage status of the container can then be confirmed by detecting changes in air pressure. When the container, having completed the test, moves to the corresponding position at the feeding end of the container delivery mechanism 4 along with the detection turntable 301, the container support device 303, driven by the drive component 305, lowers the container support plate 3031 to the same height as the container delivery mechanism 4. At this point, the container on the support plate 3031 can be carried out and transported by the container delivery mechanism 4. This structure allows for the raising and lowering of the container support plate 3031 during the testing process, switching the container's position between the feeding / discharging station and the sealing test station. This ensures smooth movement of the container during feeding / discharging without jamming, and during leak detection, it contacts the sealing cover 3041 for sealing. The entire process does not damage the container.

[0025] The air pressure leak detection device also includes an air pump 3042, an air extraction pipe 3043, a solenoid valve, and a detection pipe 3044. The air pump 3042 is mounted on the detection turntable 301. The air pump 3042 has an air extraction port and a detection port. The air extraction port of the air pump 3042 is connected to the air extraction port of the corresponding sealing cover through the air extraction pipe 3043. The detection port is connected to one end of the detection pipe 3044 through the solenoid valve. The square tank leak detector also includes a follow-up turntable 6, a fixed plate 7, and two vacuum sensors 8. The follow-up turntable 6 is coaxially arranged with the detection turntable 301. The follow-up turntable 6 is provided with multiple first detection channels, the same number as the air pressure leak detection device. The other end of the detection pipe 3044 is connected to one end of the corresponding first detection channel. The surface of the fixed plate 7 seals the other end of the first detection channel, and the fixed plate 7 has two second detection channels. The number of vacuum sensors 8 is the same as the number of second detection channels and they correspond one-to-one. The vacuum sensors 8 are set in the corresponding second detection channels. The vacuum pump 3042 extracts air from the square tank through the vacuum pipe 3043. One of the second detection channels corresponds to the output end of the square tank feeding mechanism along the rotation direction of the detection turntable 301, and the other second detection channel corresponds to the input end of the square tank feeding mechanism along the rotation direction of the detection turntable 301. After the square tank is evacuated, the first detection channel on the follower turntable 6 connects with the first second detection channel. At this time, the solenoid valve opens to connect the detection port with the detection pipe 3044, and the vacuum sensor 8 performs the first detection on the square tank. Subsequently, the detection turntable 301 drives the square tank to rotate, and the other first detection channels connect with the first second detection channel, and so on in a cycle. When the square tank rotates with the detection turntable 301 to the second detection station after the first detection, the first detection channel connects with the second second detection channel. At this time, the vacuum sensor 8 performs the second detection on the square tank. By comparing the two detection results, it can be determined whether there is any leakage in the square tank.

[0026] The can-holding device 303 also includes a swing arm 3032, a roller 3033, a lifting seat 3034, and two elastic support units 3035. The first end of the swing arm 3032 is hinged to the detection turntable 301, and the second end of the swing arm 3032 is hinged to the lifting seat 3034. The roller 3033 is rotatably mounted on the second end of the swing arm 3032. The elastic support unit 3035 is movably mounted on the detection turntable 301. The lower end of the elastic support unit 3035 is connected to the lifting seat 3034, and the upper end of the elastic support unit 3035 is connected to the can-holding tray 3031. The driving component 305 is a cam guide rail with a protruding section. The cam guide rail is fixedly mounted on the frame 1, and the rotation trajectory of the cam guide rail and the roller 3033 is matched when the detection turntable 301 rotates. The square can feeding mechanism 2 and the square can feeding mechanism 4 correspond to the positions of the protruding sections of the cam guide rail, respectively. When each can-holding device 303 rotates with the detection turntable 301 and moves to the corresponding position of the square can feeding mechanism 2 or the square can dispensing mechanism 4, the roller 3033 moves along the cam guide rail to the corresponding protruding section. At this time, under the action of the protruding section of the cam guide rail, the second end of the swing arm 3032 swings downward and drives the lifting seat 3034 to descend, thereby pulling the can-holding plate 3031 down through the elastic support unit 3035, so that the can-holding plate 3031 descends to the same height as the square can feeding mechanism 2 or the square can dispensing mechanism 4. When the roller 3033 leaves the protruding section of the cam guide rail, the can-holding plate 3031, the lifting seat 3034 and the second end of the swing arm 3032 can move upward again under the action of the elastic support unit 3035, so that the square can on the can-holding plate 3041 can be sealed.

[0027] The detection turntable 301 has multiple guide holes 3011. The elastic support unit 3035 includes guide support rods 30351 and compression springs 30352. The number of guide support rods 30351 and guide holes 3011 are the same and correspond one-to-one. The guide support rods 30351 can move up and down through the corresponding guide holes 3011. The upper end of the guide support rod 30351 is connected to the tray 3031, and the lower end of the guide support rod 30351 is connected to the lifting seat 3034. The compression spring 30352 is sleeved on the guide support rod 30351, and the upper end of the compression spring 30352 is connected to or in close contact with the tray 3031, and the lower end of the compression spring 30352 is connected to or in close contact with the detection turntable 301. When the roller 3033 moves to the protruding section of the cam guide rail, the second end of the swing arm 3032 swings downward and drives the lifting seat 3034 to descend. At this time, the guide support rod 30351 is pulled and moves downward as well, thereby driving the can support plate 3031 to descend, and the compression spring 30352 is in a compressed state. When the roller 3033 leaves the protruding section of the cam guide rail, the can support plate 3031 is lifted up under the action of the compression spring 30352, thereby driving the guide support rod 30351 to move upward, and driving the lifting seat 3034 and the second end of the swing arm 3032 to move upward as well.

[0028] The elastic support unit 3035 also includes a limiting block 30353 and a buffer pad 30354. The limiting block 30353 and the buffer pad 30354 are respectively sleeved on the guide support rod 30351, and the lower surface of the buffer pad 30354 contacts the upper surface of the lifting seat 3034, and the lower surface of the limiting block 30353 contacts the upper surface of the buffer pad 30354. The size of the limiting block 30353 is larger than that of the guide hole 3011. By setting the limiting block 30353, the guide support rod 30351 can be prevented from gradually separating from the lifting seat 3034 due to impact during long-term up and down movement. The buffer pad 30354 can also play a buffering role, reducing the impact on the guide support rod 30351 and the lifting seat 3034.

[0029] Along the rotation direction of the detection turntable 301, the protruding section of the cam guide extends from the square can feeding mechanism 4 to the square can feeding mechanism 2. When the can tray 3031 moves to the position corresponding to the square can feeding mechanism 4 to unload the square can, it can remain in the lowered position until the square can is reloaded at the square can feeding mechanism 2.

[0030] The lower surface of the sealing cover 3041 is provided with a sealing rubber disc 30411. When the can support plate 3031 lifts the square can upward, the opening edge of the square can can contact the sealing rubber disc 30411. The sealing rubber disc 30411 can both seal the opening of the square can and prevent damage to the opening edge of the square can.

Claims

1. A square can leak detection machine, comprising a frame, a square can feeding mechanism, a square can detection mechanism and a square can feeding-out mechanism, the square can feeding mechanism, the square can detection mechanism and the square can feeding-out mechanism being installed on the frame in sequence along the conveying direction of the square can; characterized in that: The square can testing mechanism includes a testing turntable, a first rotation drive device capable of driving the testing turntable to rotate, multiple can-supporting devices, and multiple air pressure leak detection devices. The first rotation drive device is mounted on the frame. The number of can-supporting devices and air pressure leak detection devices are the same and correspond one-to-one. Each can-supporting device and each air pressure leak detection device is arranged along the circumference of the testing turntable. The square can feeding mechanism includes an inlet conveyor belt, an inlet arc-shaped guide plate, an inlet transfer star disk, a can-turning turntable, a second rotation drive device capable of driving the inlet transfer star disk to rotate, and a third rotation drive device capable of driving the can-turning turntable to rotate. The first and second rotating drive devices are respectively mounted on the frame; a transfer can-in station is provided at the rear end of the can-in conveyor belt, and a detection can-in station is provided on the detection turntable. The can-in transfer star disk is located between the transfer can-in station and the detection can-in station. The can-in arc-shaped guide plate extends from the transfer can-in station to the detection can-in station and matches the contour of the can-in transfer star disk. A first base plate for supporting the square can is provided below the can-in transfer star disk or the can-in arc-shaped guide plate. The can-dispensing turntable is located at the rear end of the can-in conveyor belt, and the can-dispensing turntable and the can-in transfer star disk are respectively located on both sides of the can-in conveyor belt. The linear velocity of the can-dispensing turntable and the can-in transfer star disk is the same. A leaking can rejection device is provided on the square can delivery mechanism.

2. The square tank leak detector as described in claim 1, characterized in that: The can-feeding transfer star disk has multiple outwardly protruding first locking blocks along its circumference. Between adjacent first locking blocks, there is a first recessed portion that is recessed towards the center. The bottom of the first recessed portion is flat. Two adjacent first locking blocks and the first recessed portion form a first square can positioning notch. The first square can positioning notch and the can-feeding arc-shaped guide plate together form a first square can receiving space. The can-pulling turntable has multiple outwardly protruding levers along its circumference. Between adjacent levers, there is a second square can positioning notch. At the can-feeding transfer station, a lever on the can-pulling turntable corresponds to a first locking block on the can-feeding transfer star disk.

3. The square tank leak detector as described in claim 1, characterized in that: The can delivery mechanism includes a can delivery conveyor belt, a can delivery arc-shaped guide plate, a can delivery transfer star disk, and a fourth rotation drive device capable of driving the can delivery transfer star disk to rotate. The can delivery conveyor belt, the can delivery arc-shaped guide plate, and the fourth rotation drive device are respectively mounted on the frame. The detection turntable has a detection can delivery station, and the front end of the can delivery conveyor belt has a transfer can delivery station. The can delivery transfer star disk is located between the detection can delivery station and the transfer can delivery station. The can delivery arc-shaped guide plate extends from the detection can delivery station to the transfer can delivery station. The can exit station matches the outline of the can exit transfer star disk. A second bottom plate for supporting the square can is provided below the can exit transfer star disk or the can exit arc guide plate. Multiple outwardly protruding second locking blocks are provided on the circumferential side of the can exit transfer star disk. A second recessed part is provided between adjacent second locking blocks in the direction of the center. The bottom of the second recessed part is flat. Two adjacent second locking blocks and second recessed parts form a third can locking notch. The third can locking notch and the can exit arc guide plate form a second square can receiving space.

4. A leak detector for a square tank as described in claim 3, characterized in that: The leaking can rejection device uses an air blowing device, which includes a high-pressure air source, a blowing nozzle, and a valve for controlling the connection of the blowing nozzle. The blowing nozzle is connected to the outlet of the high-pressure air source, and the blowing nozzle is located on one side of the can-exit conveyor belt and faces the can-exit conveyor belt. The other side of the can-exit conveyor belt is provided with a rejection channel.

5. A leak detector for a square tank as described in claim 1, characterized in that: The air pressure leak detection device includes a sealing cover plate with an air extraction port, and the can support device includes a can support tray with the sealing cover plate positioned above the corresponding can support tray. The square can detection mechanism also includes a drive component capable of driving the can support device.

6. A leak detector for a square tank as described in claim 5, characterized in that: The air pressure leak detection device further includes an air pump, an air extraction pipe, a solenoid valve, and a detection pipe. The air pump is mounted on the detection turntable and has an air extraction port and a detection port. The air extraction port of the air pump is connected to the air extraction port of the corresponding sealing cover through the air extraction pipe, and the detection port is connected to one end of the detection pipe through the solenoid valve. The square tank leak detector further includes a follow-up turntable, a fixed plate, and at least one vacuum sensor. The follow-up turntable is coaxially arranged with the detection turntable and has multiple first detection channels. The number of first detection channels is the same as that of the air pressure leak detection device. The other end of the detection pipe is connected to one end of the corresponding first detection channel. The surface of the fixed plate seals the other end of the first detection channel, and the fixed plate has at least one second detection channel. The second detection channel corresponds to the position of the first detection channel. The number of vacuum sensors is the same as that of the second detection channels and they correspond one-to-one. The vacuum sensors are set in the corresponding second detection channels.

7. A leak detector for a square tank as described in claim 5, characterized in that: The can-holding device further includes a swing arm, rollers, a lifting seat, and at least one elastic support unit. The first end of the swing arm is hinged to the detection turntable, and the second end of the swing arm is hinged to the lifting seat. The rollers are rotatably mounted on the second end of the swing arm. The elastic support unit is movable up and down on the detection turntable, and the lower end of the elastic support unit is connected to the lifting seat, while the upper end of the elastic support unit is connected to the can-holding tray. The driving component is a cam guide rail with a protruding section. The cam guide rail is fixedly mounted on the frame, and the rotation trajectory of the cam guide rail and the rollers is matched as the detection turntable rotates. The square can feeding mechanism and the square can discharging mechanism correspond to the positions of the protruding sections of the cam guide rail, respectively.

8. A leak detector for a square tank as described in claim 7, characterized in that: The detection turntable has multiple guide holes. The elastic support unit includes guide support rods and compression springs. The number of guide support rods is the same as the number of guide holes and they correspond one-to-one. The guide support rods can move up and down through the corresponding guide holes. The upper end of the guide support rod is connected to the can tray, and the lower end of the guide support rod is connected to the lifting seat. The compression spring is sleeved on the guide support rod, and the upper end of the compression spring is connected to or in close contact with the can tray, and the lower end of the compression spring is connected to or in close contact with the detection turntable.

9. A leak detector for a square tank as described in claim 8, characterized in that: The elastic support unit also includes a limiting block and a buffer pad, which are respectively sleeved on the guide support rod. The lower surface of the buffer pad is in contact with the upper surface of the lifting seat, and the lower surface of the limiting block is in contact with the upper surface of the buffer pad. The size of the limiting block is larger than the guide hole.

10. A leak detector for a square tank as described in claim 7, characterized in that: Along the rotation direction of the detection turntable, the protruding section of the cam guide rail extends from the square can feeding mechanism to the square can feeding mechanism.

Images