Square can leak detection machine

Abstract

The invention discloses a square tank leak detection machine which comprises a machine frame, a square tank feeding mechanism, a square tank detection mechanism and a square tank discharging mechanism, and the square tank feeding mechanism, the square tank detection mechanism and the square tank discharging mechanism are sequentially installed on the machine frame in the conveying direction of square tanks. The square tank detection device is characterized in that the square tank detection mechanism comprises a detection turntable, a first rotation driving device capable of driving the detection turntable to rotate, a plurality of tank supporting devices and a plurality of blowing leakage detection devices; the square can feeding mechanism comprises a can feeding conveying belt, a can feeding arc-shaped guide plate, a can feeding transfer star disc, a can shifting rotary disc, a second rotation driving device and a third rotation driving device. And a leaked tank removing device is arranged on the square tank sending-out mechanism. The square can leak detection machine can continuously detect the sealing effect of square cans, is suitable for various square cans with different heights, and does not cause damage to the square cans.

Description

Technical Field

[0001] The present invention relates to the technical field of can manufacturing, and particularly to a square can leak detector. Background Art

[0002] For the leak detection of square cans for food, leak detection equipment is usually used for detection. At present, in order to convey square cans to the leak detection equipment, the method of feeding cans one by one by a separating screw is usually adopted. For example, a double-helix tank body conveying mechanism of a food square can leak detector disclosed on May 18, 2021, with a publication number of CN213230287U, is characterized in that: it includes a frame, a driving device, a transmission unit, a first spiral conveyor, a linkage unit, and a second spiral conveyor. The driving device, the transmission unit, the first spiral conveyor, the linkage unit, and the second spiral conveyor are respectively installed on the frame, and the driving device, the transmission unit, the first spiral conveyor, the linkage unit, and the second spiral conveyor are connected in sequence. The first spiral conveyor and the second spiral conveyor are arranged in parallel and rotate in opposite directions, and a plurality of food square can conveying spaces are formed between the first spiral conveyor and the second spiral conveyor. Although this double-helix tank body conveying mechanism can convey square cans one by one, however, the structure and working principle of the separating screw determine that when pushing a square can with a relatively low height, the contact area between the spiral blade on the separating screw and the side wall of the square can with a relatively low height is small, and it is difficult to accurately control the position and posture of the square can with a relatively low height. Therefore, when the spiral blade rotates, it is easy to fail to smoothly push the square can, resulting in the square can being offset, stuck during transportation, or jumping during transportation, etc., thus making the detection discontinuous and affecting the detection efficiency; secondly, due to the direct mechanical contact between the separating screw and the square can, and the rotation and pushing actions of the screw during transportation are relatively rigid, it is extremely easy to damage the surface of the square can, especially the opening edge, resulting in the destruction of the sealing performance of the square can and the occurrence of air leakage. In addition, the structure of this separating screw is relatively complex, and the operation is cumbersome and time-consuming when adjusting or replacing, and the cost is relatively high. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a square can leak detector that can continuously detect the sealing effect of square cans, is applicable to square cans with different heights, and will not cause damage to the square cans.

[0004] In order to solve the above technical problems, the following technical solutions are adopted: A square can leak detector, comprising a frame, a square can feeding mechanism, a square can detecting mechanism and a square can discharging mechanism. The square can feeding mechanism, the square can detecting mechanism and the square can discharging mechanism are sequentially installed on the frame along the conveying direction of the square can. It is characterized in that: the square can detecting mechanism includes a detecting turntable, a first rotation driving device capable of driving the detecting turntable to rotate, a plurality of can supporting devices and a plurality of air blowing leak detecting devices. The first rotation driving device is installed on the frame. The number of the can supporting devices and the air blowing leak detecting devices is the same and they are in one-to-one correspondence. Each can supporting device and each air blowing leak detecting device are respectively arranged along the circumferential direction of the detecting turntable. The square can feeding mechanism includes an inlet can conveyor belt, an inlet can arc-shaped guiding plate, an inlet can transfer star plate, a can shifting turntable, a second rotation driving device capable of driving the inlet can transfer star plate to rotate and a third rotation driving device capable of driving the can shifting turntable to rotate. The inlet can conveyor belt, the inlet can arc-shaped guiding plate, the second rotation driving device and the third rotation driving device are respectively installed on the frame. A transfer inlet can working station is arranged at the rear end of the inlet can conveyor belt. A detecting inlet can working station is arranged on the detecting turntable. The inlet can transfer star plate is located between the transfer inlet can working station and the detecting inlet can working station. The inlet can arc-shaped guiding plate extends from the transfer inlet can working station to the detecting inlet can working station and matches the contour of the inlet can transfer star plate. A first bottom plate for supporting the square can is arranged below the inlet can transfer star plate or the inlet can arc-shaped guiding plate. A plurality of outwardly protruding first clamping blocks are arranged along the circumferential direction on the inlet can transfer star plate. A first concave portion recessed towards the center of the circle is arranged between adjacent first clamping blocks. The bottom of the first concave portion is flat. An adjacent two first clamping blocks and the first concave portion form a first square can clamping notch. A first square can accommodating space is formed between the first square can clamping notch and the inlet can arc-shaped guiding plate. The can shifting turntable is located at the rear end of the inlet can conveyor belt, and the can shifting turntable and the inlet can transfer star plate are respectively located on both sides of the inlet can conveyor belt. A plurality of outwardly protruding shifting blocks are arranged along the circumferential direction on the can shifting turntable. A second square can clamping notch is formed between adjacent shifting blocks. At the transfer inlet can working station, a shifting block on the can shifting turntable corresponds to a first clamping block on the inlet can transfer star plate. The linear speeds of the can shifting turntable and the inlet can transfer star plate are the same. A leaky can removing device is arranged on the square can discharging mechanism.

[0005] Normally, the first square can positioning notch and the second square can positioning notch are both matched with the length of the square can. When the square can leak detector is in use, each square can to be tested is conveyed along the can feed conveyor belt. When the square can moves to the rear end of the can feed conveyor belt, the front block on the can feed turntable can block the front end of the square can along the rotation direction of the can feed turntable, slowing down the speed of the square can and staggering the square can with the square can in front, playing the role of separating the cans. Secondly, the square can in the second square can positioning notch will be clamped by the clamping block at the front and back ends of one side respectively, and the front end of the other side will also be clamped by the first clamping block of the can feed transfer star disk. At this time, the can feed turntable plays the role of auxiliary clamping. As the can feed turntable rotates, the square can will be pushed into the first square can positioning notch by the action of the can feed conveyor belt and the clamping block at the same time, and will contact the edge of the can feed arc guide plate. At this time, the can feed turntable will The arc-shaped guide plate of the can replaces the shifting block of the can shifting turntable to limit one side of the square can until the square can enters the first square can accommodating space in its entirety and moves along the arc-shaped guide plate for the can feed. When the square can reaches the position corresponding to the detection turntable, the first block of the can feed adapter star disk pushes the square can into the can supporting device. As the detection turntable continues to rotate, each square can enters each can supporting device respectively, and the corresponding air blowing leak detection device performs air pressure detection on the corresponding square can. The square can that has completed the inspection moves to the square can delivery mechanism along with the detection turntable, and then enters the square can delivery mechanism for continued transportation. Finally, the good square cans without air leakage can be delivered by the square can delivery mechanism, and the defective square cans with air leakage will be rejected from the square can delivery mechanism by the leaking can rejection device. This square can leak detection machine can send square cans from the square can feeding mechanism to the detection turntable one by one. It can first separate the cans and assist in clamping through the can shifting turntable, push the square cans into the first square can positioning gap, and then through the engagement and pushing of the can feeding adapter star plate, cooperate with the can feeding arc guide plate to smoothly send the square cans to the can supporting device on the detection turntable. There is no requirement for the height of the square cans during the entire transportation process, and it is suitable for the detection of square cans of various heights. At the same time, through the method of positioning and pushing, the position of the square cans can be finely limited without causing damage to the square cans, thereby realizing continuous transportation and detection of the square cans. Secondly, compared with the round tank with smooth and continuous sides, which can be rotated and quickly scanned for leaks using an annular sensor or probe, square tanks have multiple corners due to their geometric complexity and cannot be quickly scanned by rotation. Therefore, the scanning method requires the use of multi-station fixed detection or multi-angle scanning by a robotic arm. The equipment structure is more complex, difficult, and costly. Therefore, air pressure detection is more suitable for leak detection of square tanks. This detection method is simple and economical. At the same time, it also has more stringent requirements for the transportation of square tanks. Therefore, the use of the above-mentioned conveying structure for conveying square tanks can maximize the protection of the square tanks and complement the air pressure detection.

[0006] In a preferred embodiment, the square can discharging mechanism includes a can discharging conveyor belt, a can discharging arc-shaped guiding plate, a can discharging transfer star plate, and a fourth rotation driving device capable of driving the can discharging transfer star plate to rotate. The can discharging conveyor belt, the can discharging arc-shaped guiding plate, and the fourth rotation driving device are respectively installed on the frame. A can discharging detection station is provided on the detection turntable. A transfer can discharging station is provided at the front end of the can discharging conveyor belt. The can discharging transfer star plate is located between the can discharging detection station and the transfer can discharging station. The can discharging arc-shaped guiding plate extends from the can discharging detection station to the transfer can discharging station and matches the contour of the can discharging transfer star plate. A second bottom plate for supporting the square can is provided below the can discharging transfer star plate or the can discharging arc-shaped guiding plate. A plurality of outwardly protruding second clamping blocks are provided on the can discharging transfer star plate along the circumferential direction. A second recessed portion recessed towards the center of the circle is provided between adjacent second clamping blocks. The bottom of the second recessed portion is flat. Adjacent two second clamping blocks and the second recessed portion form a third square can clamping notch. A second square can accommodating space is formed between the third square can clamping notch and the can discharging arc-shaped guiding plate. When the square can needs to be discharged after being detected and moved, as the detection turntable rotates, the square can on the can supporting device will first be clamped into the third square can clamping notch, and then enter the second square can accommodating space as the can discharging transfer star plate rotates. Subsequently, it moves along the can discharging arc-shaped guiding plate until it is pushed onto the can discharging conveyor belt by the second clamping block when it breaks away from the restriction of the can discharging arc-shaped guiding plate, so that the detected square can can be sent backward along the can discharging conveyor belt. Similarly, the square can will not be damaged in this case.

[0007] Generally, the can feeding conveyor belt and the can discharging conveyor belt can be a continuous conveyor belt, and are separated by the can feeding arc-shaped guiding plate and the can discharging arc-shaped guiding plate.

[0008] In a further preferred embodiment, the defective can removing device adopts a blowing device. The blowing device includes a high-pressure air source, a can blowing nozzle, and a valve for controlling the connection of the can blowing nozzle. The can blowing nozzle is connected to the air outlet of the high-pressure air source, and the can blowing nozzle is arranged on one side of the can discharging conveyor belt and faces the can discharging conveyor belt. A removing channel is provided on the other side of the can discharging conveyor belt. When a defective square can passes by the can blowing nozzle on the can discharging conveyor belt, the valve is opened, and high-pressure gas is introduced into the can blowing nozzle to blow the defective square can from the can discharging conveyor belt to the removing channel for discharging.

[0009] In a preferred embodiment, the air-blowing leak detection device includes a sealing cover plate provided with an air-blowing port. The can supporting device includes a can supporting plate, and the sealing cover plate is located above the corresponding can supporting plate. The square can detection mechanism further includes a driving member capable of driving the can supporting device to act. When the can supporting device rotates to a position corresponding to the square can feeding mechanism or the square can discharging mechanism, the driving member can drive the can supporting device to lower the can supporting plate to the same height as the square can feeding mechanism or the square can discharging mechanism. When the can supporting device is away from the square can feeding mechanism or the square can discharging mechanism, the driving member can drive the can supporting device to raise the can supporting plate and make it close to the sealing cover plate. When the can supporting device rotates with the detection turntable to a position corresponding to the discharging end of the square can feeding mechanism, the can supporting device is driven by the driving member to lower the can supporting plate to the same height as the square can feeding mechanism. At this time, the square can will be pushed and transferred to the can supporting plate by the in-can transfer star plate. As the detection turntable continues to rotate, the can supporting device gradually moves away from the square can feeding mechanism. At this time, the can supporting device is driven by the driving member to drive the can supporting plate and the square can to rise together, so that the opening of the square can contacts the sealing cover plate and is sealed by the sealing cover plate. Then, the air-blowing leak detection device can blow air into the square can through the air-blowing port to detect the air leakage of the square can. When the square can that has completed the detection moves with the detection turntable to a position corresponding to the feeding end of the square can discharging mechanism, the can supporting device is driven by the driving member to lower the can supporting plate to the same height as the square can discharging mechanism. At this time, the square can on the can supporting plate can be taken out and sent away by the square can discharging mechanism. With this structure, during the detection process, the position of the square can can be switched up and down at the feeding and discharging stations and the sealing detection station by the lifting of the can supporting plate, ensuring that the square can can move smoothly without jamming during feeding and discharging, and can contact the sealing cover plate for sealing during leak detection, and the square can will not be damaged during the whole process.

[0010] The above air-blowing leak detection device can adopt a structure in which a gas source, a blow pipe and a pressure detection device are combined. The blow pipe is connected to the air outlet of the gas source and extends into the air-blowing port of the sealing cover plate. During leak detection, the gas source blows air into the sealed square can through the blow pipe. At this time, the pressure detection device detects the pressure of the blow pipe. When the pressure decreases or fails to reach the predetermined value, it is regarded that the square can has a leak.

[0011] In a further preferred solution, the can supporting device further includes a swing arm, a roller, a lifting seat, and at least one elastic support unit. The first end of the swing arm is hinged to the detection turntable, the second end of the swing arm is hinged to the lifting seat, the roller is rotatably arranged at the second end of the swing arm, the elastic support unit is arranged on the detection turntable so as to be movable up and down, the lower end of the elastic support unit is connected to the lifting seat, and the upper end of the elastic support unit is connected to the can supporting plate; the driving member is a cam guide rail with a protruding section, the cam guide rail is fixedly installed on the frame, and the cam guide rail matches the rotation trajectory of the roller when the detection turntable rotates. The square can feeding mechanism and the square can discharging mechanism are respectively corresponding to the position of the protruding section of the cam guide rail. When each can supporting device rotates with the detection turntable and moves to the position corresponding to the square can feeding mechanism or the square can discharging mechanism, the roller moves along the cam guide rail to the protruding section correspondingly. 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, so as to pull the can supporting plate to descend through the elastic support unit, and the can supporting plate descends to the same height as the square can feeding mechanism or the square can discharging 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 plate.

[0012] In a further preferred solution, a plurality of guiding holes are formed in the detection turntable. The elastic support unit includes a guiding support rod and a compression spring. The number of the guiding support rods is the same as that of the guiding holes and they correspond to each other one by one. The guiding support rod passes through the corresponding guiding hole in a vertically movable manner. The upper end of the guiding support rod is connected to the can supporting plate, the lower end of the guiding support rod is connected to the lifting seat, the compression spring is sleeved on the guiding support rod, and the upper end of the compression spring is connected to or in close contact with the can supporting plate, 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 guiding support rod is pulled and also moves downward, so as to drive the can supporting plate 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 supporting plate is jacked up under the action of the compression spring, so as to drive the guiding support rod to move upward, and drive the lifting seat and the second end of the swing arm to move upward accordingly.

[0013] In a still further preferred solution, the elastic support unit further includes a limiting block and a buffer pad. The limiting block and the buffer pad are respectively sleeved on the guiding support rod, and 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 that of the guiding hole. By arranging the limiting block, it can be avoided that the guiding support rod gradually disengages from the lifting seat due to the impact during long-term up and down movement, and the buffer pad can also play a buffering role to reduce the impact on the guiding support rod and the lifting seat.

[0014] In a further preferred embodiment, along the rotation direction of the detection turntable, the protruding section of the cam guide extends from the square can discharging mechanism to the square can feeding mechanism. When the can supporting tray unloads the square can at the position corresponding to the square can discharging mechanism, it can continuously maintain the lowered position until the square can is reloaded at the square can feeding mechanism.

[0015] In a further preferred embodiment, a sealing rubber disc is provided on the lower surface of the sealing cover plate. When the can supporting tray lifts the square can upwards, the opening edge of the square can can contact the sealing rubber disc, and the sealing rubber disc can not only ensure the sealing of the square can opening, but also will not damage the opening edge of the square can.

[0016] The beneficial effects of the present invention are as follows: This square can leak detector can continuously detect the sealing effect of the square can, and while ensuring the detection effect, it will not cause damage to the square can. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the square can leak detector in the embodiment of the present invention (the blow pipe is not shown); Figure 2 It is a top view of the square can leak detector in the embodiment of the present invention; Figure 3 It is a cross-sectional view of the square can detection mechanism, the square can feeding mechanism and the square can discharging mechanism (for the convenience of distinction, in this cross-sectional view, the square can detection mechanism, the square can feeding mechanism and the square can discharging mechanism are staggered up and down, and the incoming can transfer star disc and the can shifting turntable are staggered left and right); Figure 4 It is an enlarged view of the square can feeding mechanism in the embodiment of the present invention; Figure 5 It is an enlarged view of the square can discharging mechanism in the embodiment of the present invention; Figure 6 It is a schematic structural diagram of the driving member, the can supporting device and the air blowing leak detection device when the can supporting tray descends in the embodiment of the present invention; Figure 7 It is a schematic structural diagram of the can supporting device and the air blowing leak detection device when the can supporting tray ascends in the embodiment of the present invention; Figure 8 For Figure 7 The cross-sectional view along the A direction in. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present invention will be further described below in conjunction with the drawings and specific embodiments: As Figure 1-7A square can leak detection machine shown in the figure includes a frame 1, a square can feeding mechanism 2, a square can detection mechanism 3, and a square can discharging mechanism 4. The square can feeding mechanism 2, the square can detection mechanism 3, and the square can discharging mechanism 4 are sequentially installed on the frame 1 along the conveying direction of the square can. The square can detection mechanism 3 includes a detection turntable 301, a first rotation driving device 302 capable of driving the detection turntable 301 to rotate, a plurality of can supporting devices 303, and a plurality of air blowing leak detection devices 304. The first rotation driving device 302 is installed on the frame 1. The number of the can supporting devices 303 and the air blowing leak detection devices 304 is the same and they correspond one by one. Each of the can supporting devices 303 and each of the air blowing leak detection devices 304 are respectively arranged along the circumferential direction of the detection turntable 301. The square can feeding mechanism 2 includes a can feeding conveyor belt 201, a can feeding arc-shaped guide plate 202, a can feeding transfer star disc 203, a can shifting turntable 204, a second rotation driving device 205 capable of driving the can feeding transfer star disc 203 to rotate, and a third rotation driving device 206 capable of driving the can shifting turntable 204 to rotate. The can feeding conveyor belt 201, the can feeding arc-shaped guide plate 202, the second rotation driving device 205, and the third rotation driving device 206 are respectively installed on the frame 1. A transfer can feeding station is provided at the rear end of the can feeding conveyor belt 201. A detection can feeding station is provided on the detection turntable 301. The can feeding transfer star disc 203 is located between the transfer can feeding station and the detection can feeding station. The can feeding arc-shaped guide plate 202 extends from the transfer can feeding station to the detection can feeding station and matches the contour of the can feeding transfer star disc 203. A first bottom plate 2021 for supporting the square can is provided below the can feeding arc-shaped guide plate 202. A plurality of outwardly protruding first clamping blocks 2031 are provided along the circumferential direction on the can feeding transfer star disc 203. A first recessed portion recessed towards the center of the circle is provided between adjacent first clamping blocks 2031. The bottom of the first recessed portion is flat. Adjacent two first clamping blocks 2031 and the first recessed portion form a first square can clamping notch 2032. A first square can accommodating space is formed between the first square can clamping notch 2032 and the can feeding arc-shaped guide plate 202. The can shifting turntable 204 is located at the rear end of the can feeding conveyor belt 201, and the can shifting turntable 204 and the can feeding transfer star disc 203 are respectively located on both sides of the can feeding conveyor belt 201. A plurality of outwardly protruding shifting blocks 2041 are provided along the circumferential direction on the can shifting turntable 204. A second square can clamping notch 2042 is formed between adjacent shifting blocks 2041. At the transfer can feeding station, a shifting block 2041 on the can shifting turntable 204 corresponds to a first clamping block 2031 on the can feeding transfer star disc 203. The linear speeds of the can shifting turntable 204 and the can feeding transfer star disc 203 are the same. A leaky can removing device 5 is provided on the square can discharging mechanism 4.

[0019] Both the above-mentioned first square can position notch 2032 and the second square can position notch 2042 match the length of the square can. When the above-mentioned square can leak detector is in use, each square can to be detected is conveyed along the can inlet conveyor belt 201. When the square can moves to the rear end of the can inlet conveyor belt 201, along the rotation direction of the can shifting turntable 204, the front shifting block 2041 on the can shifting turntable 204 can block the front end of the square can, slow down the speed of the square can, and stagger the square can from the square can in front, playing the role of can separation. Secondly, for the square can in the second square can position notch 2042, the front and rear ends on one side will be respectively clamped by the shifting block 2041, and the front end on the other side will also be clamped by the first clamping block 2031 of the can inlet transfer star plate 203. At this time, the can shifting turntable 204 plays the role of auxiliary clamping; as the can shifting turntable 204 rotates, the square can will be pushed into the first square can position notch 2032 under the action of the can inlet conveyor belt 201 and the shifting block 2041 at the same time, and contact the edge of the can inlet arc-shaped guide plate 202. At this time, the can inlet arc-shaped guide plate 202 replaces the shifting block 2041 of the can shifting turntable 204 to limit one side of the square can until the whole square can enters the first square can accommodation space and moves along the can inlet arc-shaped guide plate 202, and when it reaches the position corresponding to the detection turntable 301, the first clamping block 2031 of the can inlet transfer star plate 203 will push the square can onto the can supporting device 303; as the detection turntable 301 rotates continuously, each square can will enter each can supporting device 303 respectively, and the corresponding air-blowing leak detection device 304 will perform air-blowing pressure detection on the corresponding square can; the square cans that have completed the detection move to the square can discharging mechanism 4 along with the detection turntable 301 and then enter the square can discharging mechanism 4 for continuous conveying; finally, the non-leaking good-quality square cans can be discharged along with the square can discharging mechanism 4, and the leaking defective square cans will be removed from the square can discharging mechanism 4 by the defective can removing device 5. This kind of square can leak detector can, when sending the square cans from the square can feeding mechanism 2 to the detection turntable 301 one by one, first perform can separation and auxiliary clamping through the can shifting turntable 204, push the square can into the first square can position notch 2032, and then through the clamping and pushing of the can inlet transfer star plate 203, cooperate with the can inlet arc-shaped guide plate 202, and smoothly send the square can onto the can supporting device 303 on the detection turntable 301. There is no requirement for the height of the square can during the whole conveying process, which is applicable to the detection of square cans of various heights. At the same time, through the way of positioning and pushing, the position of the square can can be finely limited without causing damage to the square can, so as to realize continuous conveying and detection of the square cans.Secondly, compared with the smooth and continuous side of a round tank, which allows for quick leak detection scanning by rotating and using an annular sensor or probe, due to the geometric complexity of a square tank with multiple sharp corners, it is impossible to quickly scan by rotation. Therefore, when using the scanning method, multi-station fixed detection or multi-angle scanning by a robotic arm is required, resulting in a more complex equipment structure, greater difficulty, and higher cost. Therefore, using air blowing pressure detection is more suitable for leak detection of square tanks. This detection method is simple and economical. Similarly, it has more stringent requirements for the transportation of square tanks. Therefore, using the above-mentioned transportation structure to transport square tanks can maximize the protection of square tanks and complement the air blowing pressure detection.

[0020] The square tank discharging mechanism 4 includes a discharging tank conveyor belt 401, a discharging tank arc-shaped guiding plate 402, a discharging tank transfer star plate 403, and a fourth rotation driving device 404 capable of driving the discharging tank transfer star plate 403 to rotate. The discharging tank conveyor belt 401, the discharging tank arc-shaped guiding plate 402, and the fourth rotation driving device 404 are respectively installed on the frame 1; a detection and discharging station is provided on the detection turntable 301, a transfer and discharging station is provided at the front end of the discharging tank conveyor belt 401, the discharging tank transfer star plate 403 is located between the detection and discharging station and the transfer and discharging station, the discharging tank arc-shaped guiding plate 402 extends from the detection and discharging station to the transfer and discharging station and matches the contour of the discharging tank transfer star plate 403, and a second bottom plate 4021 for supporting the square tank is provided below the discharging tank arc-shaped guiding plate 402; a plurality of outwardly protruding second clamping blocks 4031 are provided along the circumference of the discharging tank transfer star plate 403, and a second concave portion recessed towards the center of the circle is provided between adjacent second clamping blocks 4031. The bottom of the second concave portion is flat, and adjacent two second clamping blocks 4031 and the second concave portion form a third square tank clamping notch 4032. A second square tank accommodating space is formed between the third square tank clamping notch 4032 and the discharging tank arc-shaped guiding plate 402. When the square tank needs to be discharged after the detection is completed, as the detection turntable 301 rotates, the square tank on the tank supporting device 303 will first be clamped into the third square tank clamping notch 4032, and then enter the second square tank accommodating space as the discharging tank transfer star plate 403 rotates. Subsequently, it moves along the discharging tank arc-shaped guiding plate 402 until it is pushed onto the discharging tank conveyor belt 401 by the second clamping block 4031 when it breaks away from the restriction of the discharging tank arc-shaped guiding plate 402, enabling the square tank that has completed the detection to be sent backward along the discharging tank conveyor belt 401. Similarly, the square tank will not be damaged in this case.

[0021] The inlet tank conveyor belt 201 and the outlet tank conveyor belt 401 can be a continuous conveyor belt, which is partitioned by the inlet tank arc-shaped guiding plate 202 and the outlet tank arc-shaped guiding plate 402.

[0022] The leaking can rejecting device 5 adopts a blowing device. The blowing device includes a high-pressure gas source, a can blowing nozzle, and a valve for controlling the connection of the can blowing nozzle. The can blowing nozzle is connected to the air outlet of the high-pressure gas source, and the can blowing nozzle is arranged on one side of the outgoing can conveyor belt 401 and faces the outgoing can conveyor belt 401. An ejection channel is provided on the other side of the outgoing can conveyor belt 401. When a defective square can passes by the can blowing nozzle on the outgoing can conveyor belt 401, the valve is opened, and high-pressure gas is introduced into the can blowing nozzle to blow the defective square can from the outgoing can conveyor belt 401 to the ejection channel and send it out.

[0023] The air blowing and leak detection device 304 includes a sealing cover plate 3041, and an air blowing port is provided on the sealing cover plate 3041. The can supporting device 303 includes a can supporting plate 3031, and the sealing cover plate 3041 is located above the corresponding can supporting plate 3031; the square can detection mechanism 3 further includes a driving member 305 capable of driving the can supporting device 303 to act. When the can supporting 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 supporting device 303 to lower the can supporting plate 3031 to the same height as the square can feeding mechanism 2 or the square can discharging mechanism 4; when the can supporting device 303 is far away from the square can feeding mechanism 2 or the square can discharging mechanism 4, the driving member 305 can drive the can supporting device 303 to raise the can supporting plate 3031 and make it close to the sealing cover plate 3041. When the can supporting device 303 rotates with the detection turntable 301 to a position corresponding to the discharging end of the square can feeding mechanism 2, the can supporting device 303 is driven by the driving member 305 to lower the can supporting plate 3031 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 incoming can transfer star plate 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, the can supporting device 303 is driven by the driving member 305 to drive the can supporting plate 3031 and the square can to rise together, so that the opening of the square can contacts the sealing cover plate 3041 and is sealed by the sealing cover plate 3041; then the air blowing and leak detection device 304 can blow air into the square can through the air blowing port to detect the air leakage condition of the square can; when the square can that has completed the detection moves with the detection turntable 301 to a position corresponding to the feeding end of the square can discharging mechanism 4, the can supporting device 303 is driven by the driving member 305 to lower the can supporting plate 3031 to the same height as the square can discharging mechanism 4. At this time, the square can on the can supporting plate 3031 can be taken out and sent away by the square can discharging mechanism.. With this structure, during the detection process, the position of the square can can be switched up and down at the feeding and discharging stations and the sealing detection station by the lifting of the can supporting plate 3031, ensuring that the square can can move smoothly without getting stuck during feeding and discharging, and can contact the sealing cover plate 3041 for sealing during leak detection, and the whole process will not cause damage to the square can either.

[0024] The above-mentioned air-blowing leak detection device 304 can adopt a structure in which an air source, an air blowing pipe and a pressure detection device are combined. The air blowing pipe is connected to the air outlet of the air source, and the air blowing pipe extends into the air blowing port of the sealing cover plate 3041. During leak detection, the air source blows air into the sealed square tank through the air blowing pipe. At this time, the pressure detection device detects the air pressure in the air blowing pipe. When the air pressure decreases or fails to reach the predetermined value, it is considered that the square tank leaks.

[0025] The can supporting device 303 further 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, the second end of the swing arm 3032 is hinged to the lifting seat 3034, and the roller 3033 is rotatably arranged at the second end of the swing arm 3032. The elastic support unit 3035 is movably arranged up and down 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 supporting plate 3031. The driving member 305 is a cam guide rail with a protruding section. The cam guide rail is fixedly installed on the frame 1, and the cam guide rail matches the rotation trajectory of the roller 3033 when it rotates with the detection turntable 301. The square tank feeding mechanism 2 and the square tank discharging mechanism 4 are respectively corresponding to the protruding section positions of the cam guide rail. When each can supporting device 303 rotates with the detection turntable 301 and moves to the position corresponding to the square tank feeding mechanism 2 or the square tank discharging mechanism 4, the roller 3033 moves along the cam guide rail to the protruding section correspondingly. 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, so as to pull the can supporting plate 3031 to descend through the elastic support unit 3035, so that the can supporting plate 3031 descends to the same height as the square tank feeding mechanism 2 or the square tank discharging mechanism 4. When the roller 3033 leaves the protruding section of the cam guide rail, the can supporting 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 tank on the can supporting plate 3031 can be sealed by the sealing cover plate 3041.

[0026] A plurality of guiding holes 3011 are formed in the detection turntable 301. The elastic support unit 3035 includes a guiding support rod 30351 and a compression spring 30352. The number of guiding support rods 30351 is the same as that of the guiding holes 3011 and they correspond one by one. The guiding support rod 30351 passes through the corresponding guiding hole 3011 in a vertically movable manner. The upper end of the guiding support rod 30351 is connected to the can tray 3031, and the lower end of the guiding support rod 30351 is connected to the lifting seat 3034. The compression spring 30352 is sleeved on the guiding support rod 30351, and the upper end of the compression spring 30352 is connected to or in close contact with the can 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 guiding support rod 30351 is pulled and also moves downward, thereby driving the can tray 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 tray 3031 is jacked up under the action of the compression spring 30352, thereby driving the guiding support rod 30351 to move upward, and driving the lifting seat 3034 and the second end of the swing arm 3032 to move upward accordingly.

[0027] The elastic support unit 3035 further includes a limit block 30353 and a buffer pad 30354. The limit block 30353 and the buffer pad 30354 are respectively sleeved on the guiding support rod 30351, and the lower surface of the buffer pad 30354 is in contact with the upper surface of the lifting seat 3034, and the lower surface of the limit block 30353 is in contact with the upper surface of the buffer pad 30354; the size of the limit block 30353 is larger than that of the guiding hole 3011. By providing the limit block 30353, it can be avoided that the guiding support rod 30351 gradually disengages from the lifting seat 3034 due to impact during long-term vertical movement, and the buffer pad 30354 can also play a buffering role to reduce the impact on the guiding support rod 30351 and the lifting seat 3034.

[0028] Along the rotation direction of the detection turntable 301, the protruding section of the cam guide rail extends from the square can discharging mechanism 4 to the square can feeding mechanism 2. When the can tray 3031 unloads the square can at the position corresponding to the square can discharging mechanism 4, it can continuously maintain the lowered position until the square can is reloaded at the square can feeding mechanism 2.

[0029] A sealing rubber disc 30411 is provided on the lower surface of the sealing cover plate 3041. When the can tray 3031 lifts the square can upward, the opening edge of the square can can be in contact with the sealing rubber disc 30411. The sealing rubber disc 30411 can not only ensure the sealing of the square can opening but also will not damage the opening edge of the square can.

Claims

1. A square can leak detector, comprising a frame, a square can feeding mechanism, a square can detecting mechanism and a square can discharging mechanism, wherein the square can feeding mechanism, the square can detecting mechanism and the square can discharging mechanism are sequentially installed on the frame along the conveying direction of the square can; characterized in that: The square can detection mechanism includes a detection turntable, a first rotation driving device capable of driving the detection turntable to rotate, a plurality of can supporting devices and a plurality of air blowing leak detection devices. The first rotation driving device is installed on the frame. The number of the can supporting devices and the air blowing leak detection devices is the same and they correspond to each other one by one. Each can supporting device and each air blowing leak detection device are respectively arranged along the circumferential direction of the detection turntable. The square can feeding mechanism includes a can feeding conveyor belt, a can feeding arc-shaped guide plate, a can feeding transfer star plate, a can shifting turntable, a second rotation driving device capable of driving the can feeding transfer star plate to rotate, and a third rotation driving device capable of driving the can shifting turntable to rotate. The can feeding conveyor belt, the can feeding arc-shaped guide plate, the second rotation driving device and the third rotation driving device are respectively installed on the frame. A transfer can feeding station is provided at the rear end of the can feeding conveyor belt. A can detection feeding station is provided on the detection turntable. The can feeding transfer star plate is located between the transfer can feeding station and the can detection feeding station. The can feeding arc-shaped guide plate extends from the transfer can feeding station to the can detection feeding station and matches the contour of the can feeding transfer star plate. A first bottom plate for supporting the square can is provided below the can feeding transfer star plate or the can feeding arc-shaped guide plate. A plurality of outwardly protruding first clamping blocks are arranged along the circumferential direction on the can feeding transfer star plate. A first concave portion recessed towards the center of the circle is provided between adjacent first clamping blocks. The bottom of the first concave portion is flat. Adjacent two first clamping blocks and the first concave portion form a first square can clamping notch. A first square can accommodating space is formed between the first square can clamping notch and the can feeding arc-shaped guide plate. The can shifting turntable is located at the rear end of the can feeding conveyor belt, and the can shifting turntable and the can feeding transfer star plate are respectively located on both sides of the can feeding conveyor belt. A plurality of outwardly protruding shifting blocks are arranged along the circumferential direction on the can shifting turntable. A second square can clamping notch is formed between adjacent shifting blocks. At the transfer can feeding station, a shifting block on the can shifting turntable corresponds to a first clamping block on the can feeding transfer star plate. The linear speeds of the can shifting turntable and the can feeding transfer star plate are the same. A leaky can rejection device is provided on the square can discharging mechanism.

2. The square can leak detector according to claim 1, characterized in that: The square can discharging mechanism includes a can discharging conveyor belt, a can discharging arc-shaped guide plate, a can discharging transfer star plate, and a fourth rotation driving device capable of driving the can discharging transfer star plate to rotate. The can discharging conveyor belt, the can discharging arc-shaped guide plate and the fourth rotation driving device are respectively installed on the frame. A can detection discharging station is provided on the detection turntable. A transfer can discharging station is provided at the front end of the can discharging conveyor belt. The can discharging transfer star plate is located between the can detection discharging station and the transfer can discharging station. The can discharging arc-shaped guide plate extends from the can detection discharging station to the transfer can discharging station and matches the contour of the can discharging transfer star plate. A second bottom plate for supporting the square can is provided below the can discharging transfer star plate or the can discharging arc-shaped guide plate. A plurality of outwardly protruding second clamping blocks are arranged along the circumferential direction on the can discharging transfer star plate. A second concave portion recessed towards the center of the circle is provided between adjacent second clamping blocks. The bottom of the second concave portion is flat. Adjacent two second clamping blocks and the second concave portion form a third square can clamping notch. A second square can accommodating space is formed between the third square can clamping notch and the can discharging arc-shaped guide plate.

3. The square can leak detector according to claim 2, characterized in that: The leaky can rejection device uses a blowing device, which includes a high-pressure air source, a can blowing nozzle, and a valve for controlling the connection of the can blowing nozzle. The can blowing nozzle is connected to the air outlet of the high-pressure air source, and the can blowing nozzle is arranged on one side of the can outlet conveyor belt and faces the can outlet conveyor belt. An ejection channel is provided on the other side of the can outlet conveyor belt.

4. The square can leak detector according to claim 1, characterized in that: The blowing leak detection device includes a sealing cover plate with a blowing port provided thereon. The can supporting device includes a can supporting tray, and the sealing cover plate is located above the corresponding can supporting tray. The square can detection mechanism further includes a driving member capable of driving the can supporting device to act. When the can supporting device rotates to a position corresponding to the square can feeding mechanism or the square can discharging mechanism, the driving member can drive the can supporting device to lower the can supporting tray to the same height as the square can feeding mechanism or the square can discharging mechanism; when the can supporting device is away from the square can feeding mechanism or the square can discharging mechanism, the driving member can drive the can supporting device to raise the can supporting tray and close to the sealing cover plate.

5. The leak detector for square cans according to claim 4, characterized in that: The can supporting device further includes a swing arm, a roller, a lifting seat, and at least one elastic support unit. The first end of the swing arm is hinged to the detection turntable, the second end of the swing arm is hinged to the lifting seat, and the roller is rotatably arranged on the second end of the swing arm. The elastic support unit is vertically movably arranged on the detection turntable, and the lower end of the elastic support unit is connected to the lifting seat, and the upper end of the elastic support unit is connected to the can supporting tray; the driving member is a cam guide rail with a protruding section, and the cam guide rail is fixedly installed on the frame, and the cam guide rail matches the rotation trajectory of the roller when rotating with the detection turntable. The square can feeding mechanism and the square can discharging mechanism are respectively corresponding to the positions of the protruding sections of the cam guide rail.

6. The square can leak detector according to claim 5, characterized in that: A plurality of guide holes are formed in the detection turntable. The elastic support unit includes a guide support rod and a compression spring. The number of guide support rods is the same as that of the guide holes and they correspond one by one. The guide support rod vertically movably passes through the corresponding guide hole. The upper end of the guide support rod is connected to the can supporting 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 supporting tray, and the lower end of the compression spring is connected to or in close contact with the detection turntable.

7. A square can leak detector according to claim 6, characterized in that: The elastic support unit further includes a limit block and a buffer pad. The limit block and the buffer pad are respectively sleeved on the guide support rod, and the lower surface of the buffer pad contacts the upper surface of the lifting seat, and the lower surface of the limit block contacts the upper surface of the buffer pad; the size of the limit block is larger than the guide hole.

8. The leak detector for square cans according to claim 5, characterized in that: Along the rotation direction of the detection turntable, the protruding section of the cam guide rail extends from the square can discharging mechanism to the square can feeding mechanism.

9. The square can leak detector according to claim 4, characterized in that: A sealing rubber disk is provided on the lower surface of the sealing cover plate.

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