A missing carton detection and rejection system on a carton lift conveyor

Abstract

The application discloses a kind of missing carton detection and rejection systems on carton lifting conveying mechanism, and relates to the technical field of carton cigarette quality detection.It includes photon detector, push-out mechanism, push-out mechanism is arranged at one side of carton lifting conveying mechanism, and the other side of carton lifting conveying mechanism is provided with rejection outlet, and collection transfer mechanism is also provided at rejection outlet;Push-out mechanism includes gas storage tank, gas outlet nozzle arranged towards rejection outlet, and solenoid valve on the connecting pipeline between gas outlet nozzle and gas storage tank.The missing carton detection and rejection system of the present application on carton lifting conveying mechanism is to achieve the purpose of automatically and quickly detecting missing carton and automatically and quickly rejecting missing carton under the premise of ensuring carton conveying efficiency.

Description

Technical Field

[0001] This invention relates to the field of cigarette carton quality inspection technology, and in particular to a carton lifting and conveying mechanism for detecting and rejecting missing cartons. Background Technology

[0002] During the manufacturing process of cigarette cartons, factors such as untimely replenishment of cigarette packs, pack jamming, and precision errors in mechanical equipment can all lead to insufficient cigarette packs in the carton, resulting in missing packs. Currently, packaging machines commonly use photon detectors to detect missing packs. When a defective carton is detected, the packaging machine and elevator are stopped and an alarm is triggered, prompting the operator to remove the defective carton.

[0003] In response, Chinese utility model patent CN218662707U discloses an electrically controlled automatic rejection device for missing cartons in a lifting machine. This device features a rejection channel spaced along one side of the existing cigarette conveying channel, with its upstream end connected to the conveying channel. A cylinder assembly is installed above the existing photon detector. This assembly includes a solenoid valve connected to the original machine's PLC and a cylinder push rod. A through-hole is provided at the corresponding position in the conveying channel and on the cylinder push rod, allowing the push rod to push the cigarettes into the rejection channel. The downstream horizontal section of the rejection channel is opposite the lifting machine inlet and is open-topped, facilitating the manual removal of cartons pushed into the rejection channel by the cylinder. This utility model can automatically complete the online rejection of missing cartons. The placement and structural features of the rejection channel allow for easy removal of the rejected cartons without interfering with other components of the original machine.

[0004] However, the device still has the following technical defects:

[0005] 1. Every time the cylinder assembly pushes out the missing package box, the elevator has to stop temporarily, which reduces the original conveying efficiency of the elevator.

[0006] Second, since the missing packing box mainly relies on its own weight to fall naturally in the smoke removal channel, and the rectangular shape of the missing packing box does not match the curved section in the smoke removal channel, the missing packing box is prone to getting stuck in the smoke removal channel.

[0007] 3. After passing through the photon detector, the carton gradually slides down the lifting conveyor section after passing through the arc conveyor section. It is supported by the support bracket on the conveyor belt. However, the carton (especially the carton with missing packages, whose center of gravity is off-center) may tilt during the downward slide. This will cause the carton to be skewed when it is conveyed on the lifting conveyor section, affecting the normal conveying of the carton. The carton with missing packages will also be unable to be pushed out normally due to the tilt.

[0008] Fourth, when the missing packing box is suspended at the entrance of the smoke extraction channel, it cannot be guaranteed that the missing packing box will always be suspended at a position where its lower end is higher than the lower edge of the smoke extraction channel entrance and its upper end is lower than the upper edge of the smoke extraction channel entrance. When the missing packing box is not suspended in a good position, it will be blocked by the upper or lower edge of the smoke extraction channel entrance, causing the missing packing box to be blocked at the entrance of the smoke extraction channel and affecting the normal operation of the elevator. Summary of the Invention

[0009] This invention provides a missing carton detection and rejection system for a carton lifting and conveying mechanism. By setting up an air-blowing ejection component, missing cartons can be blown out from the rejection outlet even when the carton conveying mechanism is not stopped. The blown-out missing cartons are then collected and automatically transferred to the ground by a collection and transfer mechanism, so as to achieve the purpose of automatically and quickly detecting and rejecting missing cartons while ensuring carton conveying efficiency.

[0010] The technical solution of this invention to solve the above problems is: providing a carton missing pack detection and rejection system on a carton lifting and conveying mechanism, including a photon detector and a push-out mechanism arranged sequentially on the carton lifting and conveying mechanism along the carton conveying direction. The push-out mechanism is located on one side of the carton lifting and conveying mechanism, and a rejection outlet is opened on the other side of the carton lifting and conveying mechanism opposite to the push-out mechanism. A collection and transfer mechanism is also provided at the rejection outlet. The push-out mechanism includes an air tank, an air outlet nozzle facing the rejection outlet, and a solenoid valve on the connecting pipe between the air outlet nozzle and the air tank. When the carton lifting and conveying mechanism is working, the photon detector first detects whether the carton on it is missing a pack. Cartons that are determined to be missing a pack by the photon detector are subsequently pushed out laterally from the rejection outlet to the collection and transfer mechanism when they pass through the push-out mechanism.

[0011] Furthermore, both the photon detector and the solenoid valve are electrically connected to the control center of the bar box lifting and conveying mechanism. The control center controls the working state of the ejection mechanism through the solenoid valve based on the detection results of the photon detector.

[0012] Furthermore, the distance between the photon detector and the ejection mechanism remains unchanged.

[0013] Furthermore, a limiting guide bar is provided above the carton lifting and conveying mechanism, and the distance between the limiting guide bar and the conveyor belt of the carton lifting and conveying mechanism is greater than or equal to the width of the carton.

[0014] Furthermore, the collection and transfer mechanism includes a track, an electric slide, and a carrying platform. The track is vertically arranged on the side of the carton lifting and conveying mechanism. The electric slide is arranged on the track, and the carrying platform is arranged on the electric slide. The electric slide is used to drive the carrying platform to move up and down between the ground and the rejection outlet of the carton lifting and conveying mechanism, so as to collect the missing cartons pushed out from the rejection outlet of the carton lifting and conveying mechanism and transport them to the ground position.

[0015] Furthermore, in addition to the edge near the rejection outlet, the other edges of the loading platform are also equipped with enclosing baffles to prevent missing packing boxes from falling off.

[0016] Furthermore, a first sensor is provided on the inner side of the enclosure baffle on the side of the loading platform that is farther from the rejection exit. The first sensor is used to detect whether the missing package box on the loading platform is in contact with the enclosure baffle. When the missing package box on the loading platform is pushed to contact the enclosure baffle where the first sensor is located, the first sensor transmits the detection signal to the controller of the electric slide. The controller controls the electric slide to move downward, thereby transferring the missing package box to the ground position.

[0017] Furthermore, a blockage detection device for detecting whether the carton is blocked is also provided at the rejection outlet; the blockage detection device includes an upper swing plate rotatably disposed at the upper edge of the rejection outlet, a lower swing plate rotatably disposed at the lower edge of the rejection outlet, an upper proximity switch near the upper swing plate and disposed outside the carton lifting and conveying mechanism, and a second sensor disposed at one end of the carrying platform facing the rejection outlet. The upper proximity switch and the second sensor are both electrically connected to the control center of the carton lifting and conveying mechanism; when the missing carton is blocked at the rejection outlet, the missing carton correspondingly pushes the upper swing plate to swing closer to the upper proximity switch, or pushes the lower swing plate to contact and apply pressure to the second sensor, so that the upper proximity switch or the second sensor sends a blockage signal to the control center, thereby stopping the carton lifting and conveying mechanism.

[0018] Furthermore, it also includes a mounting bracket for mounting the upper proximity switch; the mounting bracket includes a horizontal bracket and a vertical bracket, the vertical bracket has a movable through hole in the middle for the horizontal bracket to be inserted, and the vertical bracket is movably mounted on the horizontal bracket through the movable through hole; when the mounting bracket is mounted on the upper edge of the rejection outlet, the upper proximity switch is mounted at the lower end of the vertical bracket.

[0019] Furthermore, the vertical support is also provided with a locking threaded hole and a locking bolt that is fitted in the locking threaded hole. The locking threaded hole is connected to the movable through hole, so that the locking bolt can be pressed against the horizontal support body located in the movable through hole from the locking threaded hole, thereby restricting the current position of the vertical support.

[0020] The beneficial effects of this invention are:

[0021] 1. When using air blowing to eject missing cartons, the carton lifting and conveying mechanism does not need to be stopped, thus ensuring the conveying efficiency of the carton lifting and conveying mechanism.

[0022] Second, by keeping the distance between the ejection mechanism and the photon detector constant, and combining this with the transport speed of the carton lifting conveyor mechanism, the time interval between the control center receiving the identification signal from the photon detector and the control center issuing the control signal to the solenoid valve can be calculated, thereby ensuring that the ejection assembly can accurately eject the missing carton.

[0023] Third, compared to the channel-type conveyor structure, the missing package box is not easy to tilt or tip over during the process of moving to the loading platform, and there will be no problem such as the missing package box blocking the channel.

[0024] Fourth, the loading platform can carry multiple missing packing boxes. When the number of missing packing boxes on the loading platform reaches a certain amount, it will be detected by the sensor, which can then control the loading platform to descend to the ground and issue a light alarm to help workers clear the accumulated missing packing boxes on the loading platform, thereby avoiding the problem of too many missing packing boxes piling up on the loading platform.

[0025] 5. The blockage detection device is used to detect whether the missing carton is blocked at the rejection exit, so as to effectively avoid the problem of missing carton being lifted and conveyed to the next equipment as normal carton due to the failure to detect the blockage at the rejection exit in time, or the missing carton being further squeezed and blocked at the rejection exit, causing blockage failure of the carton lifting and conveying mechanism. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the missing packaging box detection and rejection system according to a specific embodiment of the present invention;

[0028] Figure 2 for Figure 1 A magnified schematic diagram of a local structure;

[0029] 1-Photon detector, 2-Ejection mechanism, 21-Gas tank, 22-Gas nozzle, 23-Solenoid valve, 3-Rejection outlet, 4-Collection and transfer mechanism, 41-Railway, 42-Electric slide, 43-Loading platform, 44-Enclosing baffle, 45-First sensor, 5-Limit guide bar, 6-Blocking detection device, 61-Upper swing plate, 62-Lower swing plate, 63-Upper proximity switch, 64-Second sensor, 65-Mounting bracket, 651-Horizontal bracket, 652-Vertical bracket, 653-Locking bolt. Detailed Implementation

[0030] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0031] Please see Figure 1 and Figure 2 This invention discloses a carton missing carton detection and rejection system on a carton lifting and conveying mechanism. The carton lifting and conveying mechanism includes a horizontal entry conveying section, an arc-shaped transition conveying section, and a vertical lifting conveying section. The carton missing carton detection and rejection system includes a photon detector 1 installed on one side of the horizontal entry conveying section, an ejection mechanism 2 installed on one side of the vertical lifting conveying section at a certain height, and a rejection outlet 3 installed on the other side of the vertical lifting conveying section at that height relative to the ejection mechanism 2. In addition to the rejection outlet 3, a liftable collection and transfer mechanism 4 is also provided.

[0032] When a carton enters the carton lifting and conveying mechanism, it first moves on the horizontal entry conveyor section to pass the photon detector 1. The photon detector 1 detects whether the passing carton is missing a pack. When the photon detector 1 detects a missing pack, it immediately sends a signal to the control center of the carton lifting and conveying mechanism. When the missing pack is transported to the rejection exit 3, the control center then controls the ejection mechanism 2 to work, blowing the missing pack out of the rejection exit 3 and into the collection and transfer mechanism 4. When a certain number of missing packs accumulate on the collection and transfer mechanism 4, the collection and transfer mechanism 4 descends to the ground. After the technicians clean up the missing packs on the collection and transfer mechanism 4, the collection and transfer mechanism 4 rises again to the rejection exit 3 side to collect missing packs again. This cycle repeats to achieve fully automated missing pack detection and rejection operations.

[0033] It should be noted that in this embodiment, by acquiring the distance data between the photon detector 1 and the rejection exit 3, as well as the conveying speed data of the carton lifting and conveying system, the time required for the carton at the photon detector 1 to be conveyed to the rejection exit 3 can be calculated. The control center can add this specific time interval between receiving the detection signal from the photon detector 1 and issuing the control signal to start the ejection mechanism 2, thereby realizing the automated operation from the detection of the missing carton to the ejection of the missing carton.

[0034] Furthermore, to achieve non-stop rejection operation, the ejection mechanism 2 includes an air tank 21, an air nozzle 22 facing the rejection outlet 3, and a solenoid valve 23 installed on the connecting pipe between the air nozzle 22 and the air tank 21. The solenoid valve 23 is electrically connected to the control center. When the missing carton is conveyed between the air nozzle 22 and the rejection outlet 3, the control center sends a control signal to open the solenoid valve 23. High-pressure gas is then ejected from the air tank 21 along the connecting pipe from the air nozzle 22, thereby laterally pushing the missing carton out of the carton lifting and conveying mechanism from the rejection outlet 3. Since the flowing gas applies the thrust to the missing carton, the carton lifting and conveying mechanism does not need to be temporarily stopped within the corresponding transport speed range.

[0035] Furthermore, a limiting guide bar 5 is provided above the conveyor belt of the carton lifting and conveying mechanism. The limiting guide bar 5 is fixed to the side limiting plate of the carton lifting and conveying mechanism by a side rod. Specifically, the limiting guide bar 5 extends from the end of the horizontal entry conveying section to the exit end of the vertical lifting conveying section. The height distance between the limiting guide bar 5 and the conveyor belt is slightly greater than the width of the carton, so that when the carton is conveyed and moved in the arc transition conveying section, the limiting guide bar 5 can limit the carton as it slides downward due to gravity, so that it does not tilt to the outside of the conveyor belt due to sliding.

[0036] Furthermore, the collection and transfer mechanism 4 includes a track 41, an electric slide 42, and a loading platform 43. The track 41 is vertically installed on the right rear side of the carton lifting and conveying mechanism. The electric slide 42 is installed on the track 41. The rear edge of the loading platform 43 is fixedly connected to the electric slide 42, and the loading platform 43 maintains a horizontal installation posture. The electric slide 42 can drive the loading platform 43 to move up and down along the extension direction of the track 41.

[0037] In other words, the loading platform 43 can be raised to a position level with the lower edge of the rejection outlet 3 of the carton lifting and conveying mechanism under the drive of the electric slide 42. If a carton with a missing package is transported and raised to the rejection outlet 3, the push mechanism 2 will work to push the carton with a missing package to the right, so that the carton with a missing package is pushed from the rejection outlet 3 onto the loading platform 43. When the number of cartons with missing packages on the loading platform 43 exceeds the set value, the electric slide 42 will control the loading platform 43 to descend to the ground position, and the workers will clean out the cartons with missing packages on the loading platform 43. After the cartons with missing packages on the loading platform 43 are cleaned, the electric slide 42 will drive the loading platform 43 to rise again to the lower edge of the rejection outlet 3, and a cycle will be formed.

[0038] Furthermore, to ensure that the loading platform 43 rises accurately and hovers at the lower edge of the rejection exit 3, flush with it, a limit sensor block is installed at a specific position on the track 41. This limit sensor block is positioned flush with the lower edge of the rejection exit 3, thereby limiting the rising height of the loading platform 43. Simultaneously, when the loading platform 43 contacts the limit sensor block, the electric slide 42 immediately stops, ensuring that the loading platform 43 is accurately hovered at the lower edge of the rejection exit 3, facilitating the entry of the missing package into the loading platform 43.

[0039] Furthermore, to prevent the missing packaging boxes from accumulating excessively on the loading platform 43 and to prevent the missing packaging boxes from falling off the loading platform 43, vertical enclosing baffles 44 are provided at the front edge, rear edge, and right edge of the loading platform 43. The three enclosing baffles 44 cooperate with each other to prevent the missing packaging boxes from falling off the loading platform 43.

[0040] Meanwhile, in this embodiment, since the missing pack box moves from left to right to enter the carrying platform 43, when the carrying platform 43 is set to be several times larger than the bottom surface of the missing pack box, the next missing pack box will push the previous missing pack box that entered the carrying platform 43 to continue moving to the right when it enters the carrying platform 43; in this regard, a first sensor 45 is also provided on the left side wall of the right-side enclosure baffle 44, and the upper surface of the carrying platform 43 is set to a smooth surface.

[0041] As the missing packing boxes are pushed onto the loading platform 43 one by one until the first missing packing box on the loading platform 43 is pushed to a position close to the right-side enclosure baffle 44, the number of missing packing boxes on the loading platform 43 has reached its maximum load capacity. At this point, the first sensor 45 detects the contact pressure on the left side wall of the right-side enclosure baffle 44 to determine whether a missing packing box is in contact with the right-side enclosure baffle 44. When a missing packing box is in contact with the right-side enclosure baffle 44, the pressure value detected by the first sensor 45 will increase accordingly. At this time, the first sensor 45 transmits the pressure change signal to the electric slide 42, which then controls the electric loading platform 43 to move downwards to the ground position, where workers can promptly remove the missing packing boxes to prevent them from accumulating on the loading platform 43.

[0042] Furthermore, to alert the workers on duty, a signal indicator light is installed at the upper end of the track 41. The induction control switch of the signal indicator light is also electrically connected to the first sensor 45. When the first sensor 45 detects that a missing package box is in contact with the right-side enclosure baffle 44, the first sensor 45 will also transmit a pressure change signal to the induction control switch, thereby controlling the signal indicator light to emit a photoelectric warning signal to remind the workers on duty to clean up the missing package boxes on the loading platform 43 in time, so as to ensure that when the loading platform 43 rises again to the lower edge of the rejection exit 3, there are no missing package boxes on it.

[0043] In this embodiment, the first sensor 45 is a thin-film pressure sensor.

[0044] Furthermore, to prevent the missing bar from being blocked at the rejection outlet 3 by the ejection mechanism 2 even when the missing bar has not moved to a position where its lower end is higher than the lower edge of the rejection outlet 3 and its upper end is lower than the upper edge of the rejection outlet 3, a blockage detection device 6 is also provided at the rejection outlet 3.

[0045] Specifically, the blockage detection device 6 includes an upper swing plate 61 hinged to the upper edge of the rejection outlet 3, a lower swing plate 62 hinged to the lower edge of the rejection outlet 3, an upper proximity switch 63 mounted on the mounting bracket 65 and located outside the upper swing plate 61, and a second sensor 64 mounted on the loading platform 43 facing the right end of the rejection outlet 3. The upper proximity switch 63 and the second sensor 64 are both electrically connected to the control center of the carton lifting and conveying mechanism.

[0046] When a carton with missing packaging is pushed to the right by the push mechanism 2 and blocked by the upper or lower edge of the rejection outlet 3, the carton will tilt to the right due to the pushing direction of the push mechanism 2 not being aligned with the upper or lower edge of the rejection outlet 3. When the carton with missing packaging is blocked by the upper edge of the rejection outlet 3, the tilted carton will push the upper swing plate 61 to swing to the right and approach the upper proximity switch 63. When the upper proximity switch 63 senses the upper swing plate 61, it will send a signal to the control center of the carton lifting and conveying mechanism and the signal indicator. When the control center receives the signal, it will stop the carton lifting and conveying system. When the signal indicator receives the signal, it will issue an audible and visual alarm to remind the on-duty worker to clean the blocked carton at the rejection outlet 3 in time.

[0047] When the missing carton is blocked by the lower edge of the rejection outlet 3, the right-leaning missing carton pushes the lower swing plate 62 to swing to the right and move closer to the loading platform 43. The lower swing plate 62 then applies pressure to the second sensor 64. When the second sensor 64 detects the pressure applied by the lower swing plate 62, it sends a signal to the control center and the signal indicator. When the control center receives the signal, it stops the carton lifting and conveying mechanism. After receiving the signal, the signal indicator immediately issues an audible and visual alarm, which also reminds the workers on duty to clean the blocked carton at the rejection outlet 3 in time.

[0048] In this embodiment, the second sensor 64 is also a thin-film pressure sensor.

[0049] Furthermore, in this embodiment, after the missing package box blocking the rejection outlet 3 is cleared, in order to enable the upper swing plate 61 to automatically reset, a reset torsion spring is also sleeved on the hinge structure at the upper edge of the rejection outlet 3, so that the upper swing plate 61 swinging to the right can automatically swing back to the downward vertical position under the elastic force of the reset torsion spring.

[0050] Furthermore, multiple balls are embedded in the upper swing plate 61. The balls protrude from the surface of the upper swing plate 61 and can rotate freely. This allows the contact friction resistance between the missing strip box and the upper swing plate 61 to be greatly reduced when the missing strip box tilts to the right due to the presence of the balls. As a result, the missing strip box is more likely to tilt to the right, thereby better triggering the corresponding upper proximity switch 63 and improving the detection accuracy of the blockage detection device 6.

[0051] Furthermore, in this embodiment, in order to install a proximity switch 63 on the upper right side of the rejection outlet 3, and in order to adjust the distance between the upper proximity switch 63 and the upper swing plate 61 in real time, so as to adjust the detection accuracy of the blockage detection device 6 according to the actual conveying state and actual size of the strip box, the upper proximity switch 63 is fixedly installed on the upper right side of the rejection outlet 3 by a mounting bracket 65.

[0052] Specifically, the mounting bracket 65 includes a horizontal bracket 651 and a vertical bracket 652. The vertical bracket 652 has a movable through hole in the middle for the horizontal bracket 651 to be inserted into. The vertical bracket 652 is movably mounted on the horizontal bracket 651. The vertical bracket 652 also has a locking threaded hole and a locking bolt 653 that is fitted into the locking threaded hole. The locking threaded hole is connected to the movable through hole, so that the bottom end of the locking bolt 653 can pass through the locking threaded hole into the movable through hole and abut against the horizontal bracket 651, thereby locking the vertical bracket 652.

[0053] To address this, when the mounting bracket 65 is installed on the upper right side of the rejection outlet 3, the left end of the horizontal bracket 651 is welded and fixed to the right side plate of the carton lifting and conveying mechanism. The lower end of the vertical bracket 652 is equipped with an upper proximity switch 63, which faces the upper swing plate 61. Technicians can adjust the actual distance between the upper proximity switch 63 and the upper swing plate 61 using the locking bolt 653, thereby adjusting the detection and identification accuracy. In this embodiment, the detection accuracy of the second sensor 64 is achieved by adjusting the specific lower limit value of the pressure alarm.

[0054] Anything not mentioned above applies to existing technologies.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for detecting and rejecting missing cartons on a carton lifting and conveying mechanism, characterized in that, The system includes a photon detector (1) and a push-out mechanism (2) arranged sequentially on the carton lifting and conveying mechanism along the carton conveying direction. The push-out mechanism (2) is located on one side of the carton lifting and conveying mechanism, and a rejection outlet (3) is opened on the other side of the carton lifting and conveying mechanism opposite to the push-out mechanism (2). A collection and transfer mechanism (4) is also provided at the rejection outlet (3). The push-out mechanism (2) includes an air tank (21), an air nozzle (22) facing the rejection outlet (3), and a solenoid valve (23) on the connecting pipe between the air nozzle (22) and the air tank (21). When the carton lifting and conveying mechanism is working, the photon detector (1) first detects whether the carton on it is missing a pack. The carton that is determined to be missing a pack by the photon detector (1) is then pushed out laterally from the rejection outlet (3) to the collection and transfer mechanism (4) when it passes through the push-out mechanism (2). The collection and transfer mechanism (4) includes a track (41), an electric slide (42), and a loading platform (43). The track (41) is vertically arranged on the side of the carton lifting and conveying mechanism. The electric slide (42) is arranged on the track (41), and the loading platform (43) is arranged on the electric slide (42). The electric slide (42) is used to drive the loading platform (43) to move up and down between the ground and the rejection outlet (3) of the carton lifting and conveying mechanism to collect the missing cartons pushed out from the rejection outlet (3) of the carton lifting and conveying mechanism and transport them to the ground position. The rejection outlet (3) is also equipped with a blockage detection device (6) for detecting whether the carton is blocked; the blockage detection device (6) includes an upper swing plate (61) rotatably disposed at the upper edge of the rejection outlet (3), a lower swing plate (62) rotatably disposed at the lower edge of the rejection outlet (3), an upper proximity switch (63) near the upper swing plate (61) and disposed outside the carton lifting and conveying mechanism, and a second sensor (64) disposed at one end of the loading platform (43) facing the rejection outlet (3). The upper proximity switch (63) and the second sensor (64) are both electrically connected to the control center of the carton lifting and conveying mechanism; when the missing carton is blocked at the rejection outlet (3), the missing carton correspondingly pushes the upper swing plate (61) to swing closer to the upper proximity switch (63), or pushes the lower swing plate (62) to contact and apply pressure to the second sensor (64), so that the upper proximity switch (63) or the second sensor (64) sends a blockage signal to the control center, thereby stopping the carton lifting and conveying mechanism.

2. The carton missing carton detection and rejection system on the carton lifting and conveying mechanism as described in claim 1, characterized in that, The photon detector (1) and the solenoid valve (23) are both electrically connected to the control center of the bar box lifting and conveying mechanism. The control center controls the working state of the ejection mechanism (2) through the solenoid valve (23) based on the detection result of the photon detector (1).

3. The carton missing carton detection and rejection system on the carton lifting and conveying mechanism as described in claim 2, characterized in that, The distance between the photon detector (1) and the ejection mechanism (2) remains constant.

4. The carton missing carton detection and rejection system on the carton lifting and conveying mechanism as described in claim 1, characterized in that, A limiting guide strip (5) is also provided above the carton lifting and conveying mechanism. The distance between the limiting guide strip (5) and the conveyor belt of the carton lifting and conveying mechanism is greater than or equal to the width of the carton.

5. The carton missing carton detection and rejection system on the carton lifting and conveying mechanism as described in claim 1, characterized in that, In addition to the edge near the rejection outlet (3), the other edges of the loading platform (43) are also provided with enclosure baffles (44) to prevent missing packing boxes from falling.

6. The carton missing carton detection and rejection system on the carton lifting and conveying mechanism as described in claim 5, characterized in that, A first sensor (45) is provided on the inner side of the enclosure baffle (44) on the side of the loading platform (43) that is farther away from the rejection outlet (3). The first sensor (45) is used to detect whether the missing package box on the loading platform (43) is in contact with the enclosure baffle (44). When the missing package box on the loading platform (43) is pushed to contact the enclosure baffle (44) provided with the first sensor (45), the first sensor (45) transmits the detection signal to the controller of the electric slide (42). The controller controls the electric slide to move downward, thereby transferring the missing package box to the ground position.

7. The carton missing carton detection and rejection system on the carton lifting and conveying mechanism as described in claim 1, characterized in that, It also includes a mounting bracket (65) for mounting the upper proximity switch (63); the mounting bracket (65) includes a horizontal bracket (651) and a vertical bracket (652), the vertical bracket (652) has a movable through hole in the middle for the horizontal bracket (651) to be inserted, and the vertical bracket (652) is movably mounted on the horizontal bracket (651) through the movable through hole; when the mounting bracket (65) is mounted on the upper edge of the rejection outlet (3), the upper proximity switch (63) is mounted at the lower end of the vertical bracket (652).

8. The carton missing carton detection and rejection system on the carton lifting and conveying mechanism as described in claim 7, characterized in that, The vertical support (652) is also provided with a locking thread hole and a locking bolt (653) that is fitted in the locking thread hole. The locking thread hole is connected to the movable through hole so that the locking bolt (653) can be pressed against the body of the horizontal support (651) located in the movable through hole from the locking thread hole, thereby restricting the current position of the vertical support (652).

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