Paper box conveying device

Abstract

The paper box conveying device comprises an installation frame, a positioning assembly and a conveying assembly, the positioning assembly and the conveying assembly are installed on the installation frame, the positioning assembly comprises a positioning guide rail, the conveying assembly comprises a box pushing air cylinder and a clamping conveying mechanism, and the box pushing air cylinder and the clamping conveying mechanism directly face the positioning guide rail and are close to the head end and the middle in the extending direction respectively. The clamping conveying mechanism comprises a rotating motor, a main transmission shaft and a main driven shaft located over the main transmission shaft, an output shaft of the rotating motor is in transmission connection with the main transmission shaft through a transmission piece, the main transmission shaft and the main driven shaft are sleeved with first rollers in an up-down corresponding mode, and gaps between the first rollers distributed in an up-down corresponding mode right face the positioning guide rail. The paper box pushed by the box pushing air cylinder is conveyed in a rotary clamping mode. The paper box conveying device can effectively improve the paper box conveying efficiency and increase the conveying distance, and is low in cost, wide in application range and suitable for conveying paper boxes of different length and width specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of conveying equipment, and in particular to a paper box conveying device. Background Art

[0002] In conventional carton conveying devices, cartons are generally transported by conveyor belts or pushed by cylinders. However, in the technology of transporting by conveyor belts, a robotic arm is often required for fixed-point transfer, which results in high equipment costs and inconvenient maintenance. In the technology of pushing by cylinders, the limited stroke of the cylinder can easily affect the conveying distance. In addition, the cylinder push is also prone to low pushing efficiency. If the piston rod in the cylinder retracts and contracts too quickly, the carton can easily deviate from the predetermined conveying track due to moving inertia.

[0003] In addition, paper boxes of different specifications may have different length and width dimensions. Once they exceed the conveying range of the paper box conveying device, it is difficult to perform rapid conveying, which makes the conventional paper box conveying device have the defect of a narrow application range. Summary of the invention

[0004] The embodiment of the present application provides a paper box conveying device, which can effectively improve the conveying efficiency of paper boxes, increase the conveying distance, has low cost, and has a wide range of applications, and is suitable for conveying paper boxes of different length and width specifications.

[0005] The embodiment of the present application provides a paper box conveying device, including a mounting frame and a positioning component and a conveying component mounted on the mounting frame, the positioning component including a positioning guide rail extending along the conveying direction, the conveying component including a box pushing cylinder and a clamping conveying mechanism, the box pushing cylinder and the clamping conveying mechanism both face the positioning guide rail and are respectively close to the head end and the middle of the conveying direction, the clamping conveying mechanism includes a rotating motor, a main transmission shaft and a main driven shaft located directly above the main transmission shaft, the output shaft of the rotating motor is connected to the main transmission shaft through a transmission member, the main transmission shaft and the main driven shaft are correspondingly sleeved with first rollers on the upper and lower sides, and the gap between the first rollers correspondingly distributed on the upper and lower sides faces the positioning guide rail, so that the paper box pushed by the box pushing cylinder is conveyed in a rotating clamping manner.

[0006] In a possible implementation, the transmission member includes a first transmission gear, a second transmission gear and a transmission chain, wherein the first transmission gear is fixedly mounted on the output shaft of the rotating motor, the second transmission gear is fixedly mounted on the main transmission shaft, and the transmission chain is simultaneously mounted on the first transmission gear and the second transmission gear in a transmission matching manner.

[0007] In a possible implementation, the clamping and conveying mechanism also includes a secondary transmission shaft and a secondary driven shaft located directly above the secondary transmission shaft, the secondary transmission shaft is located at a tail end of the positioning guide rail relative to the main transmission shaft, wherein the tail end is the other end of the positioning guide rail relative to the head end, the main transmission shaft and the secondary transmission shaft are transmission connected, and second rollers are correspondingly sleeved on the secondary transmission shaft and the secondary driven shaft, and the gap between the second rollers correspondingly distributed up and down faces the positioning guide rail, the diameters of the secondary transmission shaft and the secondary driven shaft are both smaller than the diameter of the main transmission shaft, and are both smaller than the diameter of the main driven shaft, and the diameter of the second roller is smaller than the diameter of the first roller.

[0008] In a possible implementation, the main transmission shaft and the auxiliary transmission shaft are connected by a first connecting rod group and a second connecting rod group that are hinged with a transfer shaft and distributed in a V shape, the transfer shaft is sleeved with a first transfer gear and a second transfer gear, the main transmission shaft and the auxiliary transmission shaft are respectively sleeved with a third transmission gear and a fourth transmission gear, the third transmission gear is transmission-connected to the first transfer gear, and the second transfer gear is transmission-connected to the fourth transmission gear;

[0009] The positioning guide rail is installed with a fixed plate, a rotating screw and two adjusting rods near the head end. The fixed plate is vertically installed on the mounting frame. The two adjusting rods are distributed side by side in the horizontal direction and extend along the extension direction of the positioning guide rail. After vertically penetrating the fixed plate, they are vertically connected to the secondary transmission shaft through an adapter plate. The ends of the two adjusting rods away from the secondary transmission shaft are vertically connected to a screw seat. The rotating screw vertically penetrates the screw seat in a threaded manner and is rotatably connected to the fixed plate.

[0010] In one possible implementation, a first hand wheel is installed at one end of the rotating screw away from the fixed plate, and the mounting frame is provided with guide grooves at both ends of the auxiliary transmission shaft, and the guide grooves extend along the extension direction of the positioning guide rail, and the auxiliary transmission shaft cooperates with the guide grooves through a sleeved bearing.

[0011] In a possible implementation, a protective cover is installed on a side of the fixing plate away from the auxiliary transmission shaft, and the screw seat is located inside the protective cover.

[0012] In a possible implementation, a second screw seat and a second screw are installed on the fixed plate with threaded fittings. The second screw extends along the extension direction of the positioning guide rail and is provided with a second hand wheel at the end away from the auxiliary transmission shaft. The second screw is vertically connected to a first adapter block after passing through the second screw seat. The first adapter block is vertically connected to a single-rod cylinder. The single-rod cylinder extends along the extension direction of the positioning guide rail and vertically passes through the fixed plate. The push box cylinder is fixedly connected to the telescopic shaft of the single-rod cylinder through the second adapter block.

[0013] In a possible implementation, the single-rod cylinder is vertically connected to a guide plate on the outer side of the fixed plate, the guide plate is vertically connected to the rotating screw via a guide sleeve, and the guide sleeve is located in the protective cover.

[0014] In one possible implementation, the positioning assembly also includes a material rack for limiting the stacked paper boxes, the material rack is located directly above the positioning guide rail, a suction cup mechanism is provided directly below the positioning guide rail, an in-place photoelectric sensor is provided at the positioning guide rail, the suction cup mechanism includes a mounting plate, a suction cup cylinder and a guide rod, the mounting plate is horizontally provided directly below the positioning guide rail, the suction cup cylinder is vertically fixedly installed on the bottom of the mounting plate, and the telescopic axis of the suction cup cylinder is fixedly connected to the guide rod after vertically penetrating the mounting plate upward, a suction cup is installed on the top of the guide rod, and the in-place photoelectric sensor and the suction cup cylinder are electrically signal-connected.

[0015] In a possible implementation, the positioning guide rail is composed of symmetrically distributed L-shaped guide plates, and a linear bearing is installed on the mounting frame on the outer side of the L-shaped guide plate. An adjusting shaft is installed in the linear bearing, and the adjusting shaft is vertically connected to the L-shaped guide plate. The surface of the adjusting shaft is provided with scale lines along the axial direction, and a top screw for tightening the adjusting shaft is installed on the linear bearing.

[0016] Beneficial effects: Compared with the prior art, the carton conveying device provided by the present application first conveys the carton in a pushing manner through the carton pushing cylinder, and then continues to convey the carton in a rotating clamping manner through the first rollers correspondingly distributed above and below, which can effectively increase the conveying distance of the carton. At the same time, the rotating clamping conveying method can improve the conveying efficiency to a certain extent, and is not likely to cause the carton to fly off the track, etc., with high conveying accuracy and low conveying cost.

[0017] On the basis of the main transmission shaft cooperating with the main driven shaft, combined with the cooperation relationship between the auxiliary transmission shaft and the auxiliary driven shaft, the range of rotary clamping and conveying can be increased, which is suitable for conveying cartons of different lengths. In addition, the diameters of the auxiliary transmission shaft, the auxiliary driven shaft and the second roller are all small, which can reduce the occupied space volume while ensuring the conveying accuracy, and is convenient for installation and use.

[0018] The main transmission shaft and the auxiliary transmission shaft are connected by a hinge shaft, a first connecting rod group and a second connecting rod group. At the same time, an adjustment rod is installed on the mounting frame, which can adjust the distance between the auxiliary transmission shaft and the main transmission shaft without affecting the transmission matching relationship between the main transmission shaft and the auxiliary transmission shaft, thereby further increasing the range of rotary clamping and conveying;

[0019] The outer side of the positioning rail is connected with an adjustment shaft, which can adjust the relative distance between the positioning rails on both sides, suitable for conveying paper boxes of different width specifications;

[0020] Through the cooperation of the material rack, suction cup mechanism and in-position photoelectric sensor, enough cartons can be stacked on the material rack for transportation. During each transportation, a carton is adsorbed to the positioning guide rail by the suction cup, which is more convenient to use and can effectively ensure the transportation efficiency.

[0021] These and other objects, features and advantages of the present invention will be fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of the paper box conveying device of the present application is shown.

[0023] Figure 2 A partial structural schematic diagram of the conveying assembly in the present application is shown.

[0024] Figure 3 A partial bottom view structural diagram of the conveying assembly in the present application is shown.

[0025] Figure 4 A schematic structural diagram of the clamping and conveying mechanism in the present application is shown.

[0026] Figure 5 A partial structural schematic diagram of the positioning component in the present application is shown.

[0027] Figure 6 A schematic structural diagram of the suction cup mechanism in the present application is shown. DETAILED DESCRIPTION

[0028] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0029] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0030] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0031] refer to Figures 1 to 6 The embodiment of the present application provides a paper box conveying device, including a mounting frame 10, a positioning assembly 20 and a conveying assembly mounted on the mounting frame 10. The positioning assembly 20 includes a positioning guide rail 21 extending along the conveying direction, wherein the positioning guide rail 21 has a leading end and a trailing end opposite to each other along the conveying direction, and the paper box is conveyed from the leading end to the trailing end. The conveying assembly includes a box pushing cylinder 30 and a clamping conveying mechanism 40, wherein the box pushing cylinder 30 and the clamping conveying mechanism 40 are both facing the positioning guide rail 21, and are respectively close to the head end and the middle of the conveying direction. At the same time, the clamping conveying mechanism 40 includes a rotating motor 41, a main transmission shaft 42 and a main driven shaft 43 located directly above the main transmission shaft 42. In addition, the output shaft 411 of the rotating motor 41 is connected to the main transmission shaft 42 through a transmission member, so as to drive the main transmission shaft 42 to rotate synchronously. At the same time, the main transmission shaft 42 and the main driven shaft 43 are correspondingly sleeved with first rollers 421 in the upper and lower parts, and the gap between the first rollers 421 correspondingly distributed in the upper and lower parts faces the positioning guide rail 21, so as to convey the paper box pushed by the box pushing cylinder 30 in a rotating clamping manner.

[0032] The carton conveying device provided in the present application combines the conventional conveying method by pushing with a cylinder and the conveying method by rotating and clamping with the first rollers 421 distributed up and down. Compared with the conveying method only by pushing with a cylinder, the conveying efficiency can be improved to a certain extent by the first rollers 421. In addition, since the carton is firmly clamped during the conveying process, it is not easy for the carton to fly away from the predetermined conveying track. The conveying accuracy is high. Compared with the transfer method by a robot arm, the conveying cost is lower. In addition, the conveying stroke can be increased to a certain extent, which is convenient to use.

[0033] In one embodiment, in combination Figure 4The transmission member includes a first transmission gear 44, a second transmission gear 45 and a transmission chain 46, wherein the first transmission gear 44 is fixedly sleeved on the output shaft 411 of the rotating motor 41, wherein the second transmission gear 45 is fixedly sleeved on the main transmission shaft 42, and the transmission chain 46 is simultaneously sleeved on the first transmission gear 44 and the second transmission gear 45 in a transmission matching manner, thereby realizing the transmission between the output shaft 411 of the rotating motor 41 and the main transmission shaft 42 in a meshing manner, and the transmission accuracy is high, wherein the transmission chain 46 can also be a transmission belt with teeth arranged on the inner surface.

[0034] In one embodiment, the clamping conveying mechanism 40 further includes a secondary transmission shaft 47 and a secondary driven shaft 48 located directly above the secondary transmission shaft 47. The secondary transmission shaft 47 is located at the rear end of the positioning guide rail 21 relative to the main transmission shaft 42. The main transmission shaft 42 and the secondary transmission shaft 47 are connected in transmission, and the transmission method can be a transmission method in which gears and chains cooperate. In addition, the secondary transmission shaft 47 and the secondary driven shaft 48 are correspondingly sleeved with second rollers 471, and the gap between the second rollers 471 correspondingly distributed in the upper and lower parts is facing the positioning guide rail 21, so that the main transmission shaft 42 and the main driven shaft 43 can be cooperated to further perform rotation clamping and conveying, which can further increase the travel range of the rotation conveying and is suitable for conveying paper boxes of various length specifications. In addition, the diameters of the secondary transmission shaft 47 and the secondary driven shaft 48 are both smaller than the diameter of the main transmission shaft 42, and smaller than the diameter of the main driven shaft 43. At the same time, the diameter of the second roller 471 is smaller than the diameter of the first roller. This can reduce the occupied space of the secondary transmission shaft 47 and the secondary driven shaft 48 without affecting the rotational transmission, making installation and use easier.

[0035] Furthermore, the main transmission shaft 42 and the secondary transmission shaft 47 are connected by a first connecting rod group 492 and a second connecting rod group 493 which are hingedly matched with a transfer shaft 491 and are distributed in a V shape, wherein the transfer shaft 491 is sleeved with a first transfer gear 4911 and a second transfer gear 4912, and correspondingly, the main transmission shaft 42 and the secondary transmission shaft 47 are respectively sleeved with a third transmission gear and a fourth transmission gear 472, wherein the third transmission gear is transmission-connected to the first transfer gear 4911, and the second transfer gear 4912 is transmission-connected to the fourth transmission gear 472, so that the distance between the main transmission shaft 42 and the secondary transmission shaft 17 can be adjusted without affecting the transmission of the main transmission shaft 42 and the secondary transmission shaft 17, and the adjustment stroke and adjustment distance vary with the change of the size of the V-shaped opening;

[0036] The positioning guide rail 21 is equipped with a fixed plate 22, a rotating screw rod 23 and two adjusting rods 24 near the head end, wherein the fixed plate 22 is vertically installed on the mounting frame 10, wherein the two adjusting rods 24 are distributed side by side in the horizontal direction and extend along the extension direction of the positioning guide rail 21, and are vertically connected to the secondary transmission shaft 47 through the adapter plate 25 after vertically penetrating the fixed plate 22, and the ends of the two adjusting rods 24 away from the secondary transmission shaft 47 are vertically connected with a screw seat 241, wherein the rotating screw rod 23 vertically penetrates the screw seat 241 in a threaded fitting manner, and is rotatably connected to the fixed plate 22, so that when the rotating screw rod 23 is rotated, the screw seat 241 can be driven based on the threaded fitting relationship to drive the two adjusting rods 24 to move along the extension direction of the positioning guide rail 21, and then the secondary transmission shaft 47 can be driven relatively close to or away from the main transmission shaft 42 through the adapter plate 25, so that the conveying stroke of the clamping conveying mechanism can be further increased.

[0037] In one embodiment, a first hand wheel 231 is installed at one end of the rotating screw 23 away from the fixed plate 22 to facilitate the rotation of the rotating screw 23. The mounting frame 10 is provided with guide grooves 101 at both ends of the secondary transmission shaft 47, wherein the guide grooves 101 extend along the extension direction of the positioning guide rail 21, and the secondary transmission shaft 47 is matched with the guide grooves 101 through the sleeved bearings, so that the secondary transmission shaft 47 can be guided by the guide grooves 101 when adjusting the secondary transmission shaft 47, so that the secondary transmission shaft 47 does not affect the rotation and clamping of the conveying paper box at different positions, wherein the bearings can simultaneously not affect the rotation and movement of the secondary transmission shaft 47.

[0038] In one embodiment, a protective cover 26 is installed on the side of the fixed plate 22 away from the secondary transmission shaft 47, and the screw seat 241 is located in the protective cover 26 to protect the screw seat 241 and ensure the matching accuracy between the screw seat 241 and the rotating screw 23.

[0039] Further preferably, a second screw seat 27 and a second screw 28 are installed on the fixed plate 22. The second screw 28 extends along the extension direction of the positioning guide rail 21, and a second hand wheel 281 is installed at one end away from the secondary transmission shaft 47 to facilitate the rotation of the second screw 28. After the second screw 28 passes through the second screw seat 27, it is vertically connected to the first adapter block 281, and the first adapter block 281 is vertically connected to the single-rod cylinder 29, wherein the single-rod cylinder 29 extends along the extension direction of the positioning guide rail 21 and vertically passes through the fixed plate 22, and the push box cylinder 30 is fixedly connected to the telescopic shaft of the single-rod cylinder 29 through the second adapter block 31, thereby the push stroke of the push box cylinder 30 can be greatly improved through the second screw 28 and the single-rod cylinder 29, wherein the single-rod cylinder 29 will not move actively after moving into position, so it will not affect the push accuracy of the push box cylinder 30, and the cost is low, wherein the push box cylinder 30 is preferably a double-rod cylinder. The specific operation is: the second screw rod 28 is rotated in the second screw rod seat 27, and the second screw rod 28 is directional moved along the direction of the positioning guide rail 21, thereby driving the single-rod cylinder 29 to directional move in this direction, and the single-rod cylinder 29 is extended and retracted to drive the box pushing cylinder 30 to directional move, and the box pushing cylinder 30 is extended and retracted to push the paper box to the clamping and conveying mechanism 40.

[0040] Further preferably, the single-rod cylinder 29 is vertically connected to a guide plate 291 on the outer side of the fixed plate 22, and the guide plate 291 is vertically connected to the rotating screw 23 through a guide sleeve 292, and the guide sleeve 292 is located in the protective cover 26, so that the accuracy of the movement direction of the single-rod cylinder 29 can be ensured by the guide plate 291. In addition, the sliding fit relationship between the guide sleeve 292 and the rotating screw 23 can also be protected by the protective cover 26, and the single-rod cylinder 29 will not be affected when the rotating screw 23 rotates.

[0041] In one embodiment, in combination Figure 5 and Figure 6The positioning assembly 20 further includes a material rack 51 for limiting the stacked paper boxes, so that a large number of paper boxes can be placed in a stacked manner on the material rack 51, generally 300-400 sheets can be placed. The material rack 51 is located directly above the positioning rail 21, and a suction cup mechanism 50 is provided directly below the positioning rail 21, and a photoelectric sensor is provided at the positioning rail 21 to sense whether the paper box is in place on the positioning rail 21. The suction cup mechanism 50 includes a mounting plate 52, a suction cup cylinder 53 and a guide rod 54, wherein the mounting plate 52 is horizontally arranged directly below the positioning guide rail 21, and the suction cup cylinder 53 is vertically fixedly installed at the bottom of the mounting plate 52, and the telescopic axis of the suction cup cylinder 53 is fixedly connected to the guide rod 54 after vertically penetrating the mounting plate 52 upward, wherein a suction cup 55 is installed on the top of the guide rod 54 for adsorbing a single paper box onto the positioning guide rail 21, wherein the in-place photoelectric sensor and the suction cup cylinder 53 are electrically connected by signal, so that after sensing that the paper box is in place, the suction cup cylinder 53 stops extending and retracting through the controller, and the suction cup 55 is deflated and detached from the paper box.

[0042] In short, first, 400 paper boxes are stacked on the material rack 51, and then the suction cup cylinder 53 moves up, and the suction cup 55 on the top of the guide rod 54 adsorbs the single paper box at the bottom, and then the suction cup cylinder 53 moves down. When the adsorbed paper box leaves the material rack 51 and moves to the positioning guide rail 21, the in-place photoelectric sensor receives a signal to stop the suction cup cylinder 53 from extending and retracting, and at the same time the suction cup 55 is deflated, and the single paper box stays on the positioning guide rail 21, and then the suction cup cylinder 53 falls and resets. This can avoid continuously conveying paper boxes to the positioning guide rail 21 through other conveying or transfer methods, thereby reducing equipment costs and making it more convenient to use. In addition, it can also ensure that the box pushing cylinder 30 only pushes one paper box at a time.

[0043] In one embodiment, the positioning guide rail 21 is composed of symmetrically distributed L-shaped guide plates 211, and a linear bearing 212 is installed on the mounting frame 10 on the outer side of the L-shaped guide plate 211, wherein an adjusting shaft 213 is installed in the linear bearing 212, and the adjusting shaft 213 is vertically connected to the L-shaped guide plate 211, and is used to push the L-shaped guide plates 211 on both sides relatively closer or farther away through the adjusting shaft 213 to adapt to the transportation of paper boxes with different width specifications. In addition, the surface of the adjusting shaft 213 is axially provided with scale lines 214 for clearly checking the adjustment distance of the adjusting shaft 213. In addition, a top screw for tightening the adjusting shaft 213 is installed on the linear bearing 212, and is used to fix the adjusting shaft 213 after the adjusting shaft 213 moves into place, so as to ensure that the L-shaped guide plate 211 remains in the adjusted position and does not move, thereby ensuring the stability of the positioning guide rail 21.

[0044] It should be noted that the length and width specifications of the paper box are merely exemplary descriptions. In some cases, they may be exactly the opposite of the description, that is, the extension direction of the directional guide rail may be the length direction of the paper box or the width direction of the paper box.

[0045] It should be noted that the terms "first, second, third and fourth" in the present application are only used for descriptive purposes and do not indicate any order. They cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0046] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A carton conveying device, characterized in that: It includes a mounting frame and a positioning component and a conveying component installed on the mounting frame, the positioning component includes a positioning guide rail extending along the conveying direction, the conveying component includes a box pushing cylinder and a clamping conveying mechanism, the box pushing cylinder and the clamping conveying mechanism are both facing the positioning guide rail and are respectively close to the head end and the middle of the conveying direction, the clamping conveying mechanism includes a rotating motor, a main transmission shaft and a main driven shaft located directly above the main transmission shaft, the output shaft of the rotating motor is connected to the main transmission shaft through a transmission member, the main transmission shaft and the main driven shaft are correspondingly sleeved with first rollers on the upper and lower sides, and the gap between the first rollers correspondingly distributed on the upper and lower sides faces the positioning guide rail, so that the paper box pushed by the box pushing cylinder is conveyed in a rotating clamping manner.

2. The carton conveying device according to claim 1, characterized in that: The transmission member includes a first transmission gear, a second transmission gear and a transmission chain, wherein the first transmission gear is fixedly sleeved on the output shaft of the rotating motor, the second transmission gear is fixedly sleeved on the main transmission shaft, and the transmission chain is simultaneously sleeved on the first transmission gear and the second transmission gear in a transmission matching manner.

3. The carton conveying device according to claim 1, characterized in that: The clamping and conveying mechanism also includes a secondary transmission shaft and a secondary driven shaft located directly above the secondary transmission shaft, the secondary transmission shaft is at a tail end relative to the main transmission shaft close to the positioning guide rail, wherein the tail end is the other end of the positioning guide rail relative to the head end, the main transmission shaft and the secondary transmission shaft are transmission connected, and second rollers are correspondingly sleeved on the secondary transmission shaft and the secondary driven shaft, and the gap between the second rollers correspondingly distributed up and down faces the positioning guide rail, the diameters of the secondary transmission shaft and the secondary driven shaft are both smaller than the diameter of the main transmission shaft, and are both smaller than the diameter of the main driven shaft, and the diameter of the second roller is smaller than the diameter of the first roller.

4. The carton conveying device according to claim 3, characterized in that: The main transmission shaft and the auxiliary transmission shaft are connected by a first connecting rod group and a second connecting rod group which are hinged with a transfer shaft and are distributed in a V shape. The transfer shaft is sleeved with a first transfer gear and a second transfer gear. The main transmission shaft and the auxiliary transmission shaft are sleeved with a third transmission gear and a fourth transmission gear respectively. The third transmission gear is in transmission connection with the first transfer gear, and the second transfer gear is in transmission connection with the fourth transmission gear. The positioning guide rail is installed with a fixed plate, a rotating screw and two adjusting rods near the head end. The fixed plate is vertically installed on the mounting frame. The two adjusting rods are distributed side by side in the horizontal direction and extend along the extension direction of the positioning guide rail. After vertically penetrating the fixed plate, they are vertically connected to the secondary transmission shaft through an adapter plate. The ends of the two adjusting rods away from the secondary transmission shaft are vertically connected to a screw seat. The rotating screw vertically penetrates the screw seat in a threaded manner and is rotatably connected to the fixed plate.

5. The carton conveying device according to claim 4, characterized in that: A first hand wheel is installed at one end of the rotating screw away from the fixed plate, and the mounting frame is provided with guide grooves at both ends of the auxiliary transmission shaft. The guide grooves extend along the extension direction of the positioning guide rail, and the auxiliary transmission shaft cooperates with the guide grooves through sleeved bearings.

6. The carton conveying device according to claim 4, characterized in that: A protective cover is installed on the side of the fixing plate away from the auxiliary transmission shaft, and the screw seat is located in the protective cover.

7. The carton conveying device according to claim 6, characterized in that: A second screw seat and a second screw with threaded matching are installed on the fixed plate, the second screw extends along the extension direction of the positioning guide rail, and a second hand wheel is installed at the end away from the auxiliary transmission shaft, the second screw is vertically connected to the first adapter block after passing through the second screw seat, the first adapter block is vertically connected to the single-rod cylinder, the single-rod cylinder extends along the extension direction of the positioning guide rail and vertically passes through the fixed plate, and the push box cylinder is fixedly connected to the telescopic shaft of the single-rod cylinder through the second adapter block.

8. The carton conveying device according to claim 7, characterized in that: The single-rod cylinder is vertically connected with a guide plate on the outer side of the fixed plate, and the guide plate is vertically connected to the rotating screw through a guide sleeve, and the guide sleeve is located in the protective cover.

9. The carton conveying device according to claim 1, characterized in that: The positioning assembly also includes a material rack for limiting the stacked paper boxes, the material rack is located directly above the positioning guide rail, a suction cup mechanism is provided directly below the positioning guide rail, an in-place photoelectric sensor is provided at the positioning guide rail, the suction cup mechanism includes a mounting plate, a suction cup cylinder and a guide rod, the mounting plate is horizontally provided directly below the positioning guide rail, the suction cup cylinder is vertically fixedly installed at the bottom of the mounting plate, and the telescopic shaft of the suction cup cylinder is fixedly connected to the guide rod after vertically penetrating the mounting plate upward, a suction cup is installed on the top of the guide rod, and the in-place photoelectric sensor and the suction cup cylinder are electrically signal connected.

10. The carton conveying device according to claim 1, characterized in that: The positioning guide rail is composed of symmetrically distributed L-shaped guide plates. A linear bearing is installed on the mounting frame on the outer side of the L-shaped guide plate. An adjusting shaft is installed in the linear bearing. The adjusting shaft is vertically connected to the L-shaped guide plate. The surface of the adjusting shaft is provided with scale lines along the axial direction. A top screw for tightening the adjusting shaft is installed on the linear bearing.

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