A control method for a sheet board conveying mechanism without a table

Abstract

The present application relates to paperboard conveying field, the present application discloses a kind of control method of paperboard conveying mechanism without platform, comprising the following steps: S1) configuration paperboard conveying mechanism without platform, paperboard conveying mechanism without platform includes front baffle, tail support plate, multiple groups of paper feeding wheel group, each group of paper feeding wheel group is driven by independent servo motor;Front baffle is provided with paper feeding gap between paper feeding wheel group, and the action period of paper feeding wheel group includes acceleration section, constant speed section, deceleration section;S2) in acceleration section, all paper feeding wheel group is synchronously accelerated to platform speed into constant speed section with the drive of the paperboard located in the lowermost part acceleration;S3): in constant speed section, paperboard is driven by paper feeding wheel and gradually leaves each paper feeding wheel group, before the tail end of paperboard leaves paper feeding wheel group, part of paper feeding wheel group starts deceleration into deceleration section in advance, and, after paperboard leaves this paper feeding wheel group, speed just drops to 0.The control method of the present application adopts paperboard conveying mechanism without lifting plate, and better protects paperboard.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paperboard conveying, in particular to a control method of a paperboard conveying mechanism without a table plate. BACKGROUND

[0002] A paperboard feeding device is usually arranged at the starting end of a paperboard production line. The current paperboard feeding device is mostly of a table plate type. When in use, the table plate type structure needs to be moved up and down by a cam to drive a connecting rod mechanism to move up and down, thereby driving a paper feeding wheel arranged at the grid plate to feed out the paperboard. The conventional table plate type conveying structure needs to match the movement of the table plate and the movement of the paper feeding wheel, and the control is relatively complex. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art.

[0004] The present application provides a control method of a paperboard conveying mechanism without a table plate, comprising the following steps:

[0005] S1): a paperboard conveying mechanism without a table plate is arranged, the paperboard conveying mechanism without a table plate comprises a front baffle, a tail supporting plate, and a plurality of groups of paper feeding wheels, each group of the paper feeding wheels is driven by an independent servo motor, and the paper feeding wheels are linearly spaced along the conveying direction of the paperboard; a paper feeding gap only allowing single paperboard to pass through is arranged between the lower end of the front baffle and the paper feeding wheels, each group of the paper feeding wheels is defined as A1, A2, A3, …, An along the conveying direction, and the action cycle of the paper feeding wheels comprises an acceleration section, a constant speed section, and a deceleration section;

[0006] S2): all the paper feeding wheels are synchronously accelerated rapidly to the machine speed in the acceleration section to enter the constant speed section and drive the paperboard at the lowermost position to accelerate;

[0007] S3): in the constant speed section, the paperboard is gradually driven by the paper feeding wheels to leave each group of the paper feeding wheels, some of the paper feeding wheels start to decelerate in advance to enter the deceleration section before the tail end of the paperboard leaves the paper feeding wheels, and the speed of the paper feeding wheels only decreases to 0 after the paperboard leaves the paper feeding wheels.

[0008] The control method of the present application adopts a paperboard conveying mechanism without a table plate. When the paperboard conveying mechanism without a table plate is in action, only the speed of the paper feeding wheels needs to be controlled to realize the conveying of the paperboard. Compared with the prior art, the control program is relatively simple. In addition, the paper feeding wheels are decelerated in advance when the tail end of the paperboard is about to leave the paper feeding wheels, so as to reduce the speed difference between the paper feeding wheels and the bottom paperboard, thereby better protecting the paperboard.

[0009] As some sub-schemes of the above technical scheme, further comprising step S4): after the paperboard at the bottom is sent out by the paperboard feeding wheel set, the bottom two paperboards are moved downward under the action of adsorption and gravity to become the new paperboard at the bottom, and then the steps S2) and S3) are cycled. As some sub-schemes of the above technical scheme, in step S1), the no-platform conveying mechanism further comprises an adsorption assembly, the adsorption assembly comprises a vacuum box and a vacuum pump, the vacuum box is arranged below the front baffle, the top surface of the vacuum box is provided with adsorption holes, the paper feeding wheel set is arranged in the vacuum box, the number of the adsorption holes corresponds to the number of each paper feeding wheel included in the paper feeding wheel set, and the top end of each paper feeding wheel extends out of the adsorption hole, and an air suction gap is left between each paper feeding wheel and the adsorption hole.

[0010] As some sub-schemes of the above technical scheme, the vacuum box is provided with a controller, pressure valves and a plurality of mutually isolated negative pressure chambers, each negative pressure chamber is connected with the vacuum pump through a pressure valve, and each pressure valve is driven by the controller. Each paper feeding wheel set is correspondingly located in one of the negative pressure chambers.

[0011] As some sub-schemes of the above technical scheme, the negative pressure chambers corresponding to the paper feeding wheels A1, A2, A3, …, An are B1, B2, B3, …, Bn, the negative pressure chambers include a vacuum degree adjustment period, the vacuum degree adjustment period includes a pressure increasing section, a constant pressure section and a pressure decreasing section, in step S2), in the acceleration section, all the negative pressure chambers enter the pressure increasing section and the suction force is increased to the paper feeding vacuum degree K1 by adjusting the pressure valve; in step S3), the paper feeding wheel set is decelerated at the same time, the negative pressure chamber corresponding to the paper feeding wheel set enters the pressure decreasing section, and the suction force is decreased to the paper supporting vacuum degree K2 by adjusting the pressure valve.

[0012] As some sub-schemes of the above technical scheme, the timing of the pressure decreasing section is earlier than that of the deceleration section.

[0013] As some sub-schemes of the above technical scheme, adjacent groups of the paper feeding wheel set are staggered with each other.

[0014] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 Structure schematic view of an embodiment of the no-platform conveying mechanism;

[0017] Figure 2Fig. 1 is a schematic view of a cross-sectional structure of an embodiment of a paperboard conveying mechanism without a table board;

[0018] Figure 3 Fig. 2 is a schematic view of a control method of a paperboard conveying mechanism without a table board;

[0019] Figure 4 Fig. 3 is a schematic view of a bottom two paperboard bending;

[0020] Figure 5 Fig. 4 is a schematic view of a motion cycle of a paperboard feeding wheel set and a vacuum degree adjustment cycle of a negative pressure chamber in a paperboard cycle.

[0021] In the drawings: 1 - front baffle; 2 - paperboard feeding wheel set; 21 - servo motor; 3 - tail support plate; D1 - bottom one paperboard; D2 - bottom two paperboard. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components have the same reference numerals throughout. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0023] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In the description of the present application, the meaning of several is indefinite, the meaning of multiple is two or more, greater than, less than, more than, etc. is understood as not including the number, above, below, etc. is understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated. And / or appearing throughout the text means three parallel schemes, for example, A and / or B means the scheme satisfied by A, the scheme satisfied by B, or the scheme satisfied by A and B at the same time.

[0025] In the description of the present application, if a short sentence contains multiple parallel features, the restrictive phrase therein is limited to the closest feature, for example: B, C and D connected to E, which means that B is arranged on A, E is connected to D, and there is no limitation on C; but for restrictive phrases such as "spaced apart" and "annular arrangement", etc., they do not belong to this category. If the restrictive phrase is preceded by the word "all", it means that it is limited to all features in the short sentence, for example: B, C and D arranged on A, which means that B, C and D are arranged on A. If the subject is omitted, the omitted subject is the subject of the previous sentence, that is, A has B, including C, which means that A has B and A includes C.

[0026] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0027] The embodiments of the present application will be described below. Figures 1 to 5 The embodiments of the present application will be described below.

[0028] The present embodiment relates to a control method of a paperboard conveying mechanism without a table board, comprising the following steps:

[0029] S1): configure a paperboard conveying mechanism without a table board, refer to Figure 1 The paperboard conveying mechanism without a table board comprises a front baffle 1, a tail baffle 3 and a plurality of paper feeding wheel groups 2, each of the paper feeding wheel groups 2 is driven by an independent servo motor 21, and the paper feeding wheel groups 2 are linearly spaced apart along the conveying direction of the paperboard; a paper feeding gap only allowing single paperboard to pass is arranged between the lower end of the front baffle 1 and the paper feeding wheel groups 2, and each of the paper feeding wheel groups 2 is defined as A1, A2, A3, …, An along the conveying direction, and the action period of the paper feeding wheel groups 2 comprises an acceleration section, a constant speed section and a deceleration section.

[0030] S2): all the paper feeding wheel groups 2 are synchronously accelerated rapidly to the machine speed in the acceleration section to enter the constant speed section and drive the paperboard located at the lowermost part to accelerate; the machine speed refers to the paperboard conveying speed corresponding to the production rhythm of the paperboard production line, and the paperboard is accelerated to the machine speed after being fed out from the feeding device so as to match the speed of the subsequent printing and slotting processes.

[0031] S3): in the constant speed section, the paperboard is gradually driven away from each paper feeding wheel group 2 by the paper feeding wheel, and part of the paper feeding wheel groups 2 start to decelerate in advance to enter the deceleration section before the tail end of the paperboard leaves the paper feeding wheel group 2, and the speed of the paperboard just drops to 0 after leaving the paper feeding wheel group 2, so as to receive the next paperboard (i.e. the second paperboard D2).

[0032] The bottom second paperboard D2 refers to the paperboard immediately above the bottommost paperboard, which is pulled down by negative pressure adsorption and gravity after the bottommost paperboard is sent away by the paper feeding wheel, and is called the new bottommost paperboard.

[0033] With reference to Figure 1 and Figure 2 , in the embodiment, the paperboards are stored in a vertical stack, the bottommost paperboard is in contact with the paper feeding wheel, and in the initial state, the bottom first paperboard D1 is in an overlapping state with the bottom second paperboard D2 above it, and the bottom second paperboard D2 is lifted by the bottom first paperboard D1 and isolated above the paper feeding wheel set 2. However, during the conveying of the bottom first paperboard D1, due to the strength problem of the paperboard itself, when the bottom first paperboard D1 starts to be conveyed by the paper feeding wheel, the tail of the bottom second paperboard D2 is in a suspended state, although the tail end of the bottom second paperboard D2 is supported by the tail support plate 3, the bottom second paperboard D2 may bend downward due to gravity, as shown in Figure 4 , especially for some thin paperboards, for example, paperboards with a thickness of less than 5 mm. In the case where the bottom first paperboard D1 is not completely sent out, since the front end of the bottom second paperboard D2 is still lifted by the bottom first paperboard D1, the bottom second paperboard D2 is still hindered by the front baffle 1, which results in a large speed difference between the rotation of the paper feeding wheel set 2 and the bottom second paperboard D2, and the speed difference is at least the rotating speed of the paper feeding wheel set 2, and at this rotating speed, the relative sliding between the paper feeding wheel set 2 and the bottom second paperboard D2 is likely to cause wear of the bottom surface of the bottom second paperboard D2, especially when there are more paperboards stacked above the bottom second paperboard D2, thereby causing quality problems. Therefore, in the present scheme, the paper feeding wheel set 2 is decelerated in advance when the tail end of the paperboard is about to leave the paper feeding wheel set 2, so as to reduce the speed difference between the paper feeding wheel set 2 and the bottom second paperboard D2 and reduce the wear of the bottom second paperboard D2.

[0034] Based on the instability of the bending of the bottom second paperboard D2, the control of each paper feeding wheel set 2 is also configured with a strain mode. In the strain mode, when the servo motor 21 corresponding to the paper feeding wheel set 2 obtains a sudden increase in torque, it indicates that the bottom second paperboard D2 bends downward and contacts the paper feeding wheel set 2. After this feedback to the control system that controls the entire paper feeding wheel set 2, appropriate measures are taken, such as issuing a warning signal to remind the technician to handle, checking the stacking of the paperboard, and then stopping the operation of the paper feeding wheel set 2. The strain mode of the paper feeding wheel set 2 and the normal mode run simultaneously, and in the normal mode, the paper feeding wheel set 2 runs in a running cycle.

[0035] The control method of the present application adopts a non-lifting plate conveying mechanism, which only needs to control the speed of the paper wheel to realize the conveying of the paperboard. Compared with the prior art, the control program is simpler. In addition, the control method decelerates the paper wheel set 2 in advance when the tail end of the paperboard is about to leave the paper wheel set 2, reduces the speed difference between the paper wheel set 2 and the bottom two paperboard D2, and better protects the paperboard.

[0036] The control method further comprises a step S4): after the paperboard at the bottom is sent out by the paper wheel set 2, the bottom two paperboard D2 moves downward under the action of adsorption and gravity to become the new paperboard at the bottom, and then the steps S2) and S3) are cycled. The continuous conveying of the paperboard can be realized by the cycling steps S2) and S3).

[0037] In addition, in the embodiment, the adjacent paper wheel sets 2 are staggered with each other. The contact points of the staggered paper wheel sets 2 with the paperboard are more widely and uniformly stepped, and the paperboard is less likely to be deflected when being accelerated.

[0038] Furthermore, in the embodiment, two groups of constant-speed paper wheel sets 2 are further arranged in front of the front baffle 1 to lengthen the acceleration distance and more accurately match the machine speed.

[0039] Since the time when each bottom one paperboard D1 leaves each paper wheel set 2 is different, the action cycle of each paper wheel set 2 is not the same in one cycle of conveying the paperboard. For example, in the paper wheel set An closest to the front baffle 1 (i.e., the paper wheel set A4 in the attached drawings), since the paperboard leaves the paper wheel set An last in the whole process of conveying the paperboard, the deceleration cycle of the paper wheel set An is the smallest. In addition, in the paper wheel set An closest to the front baffle 1, the paper wheel set 2 does not need to decelerate in advance, but only decelerates when the paperboard is completely sent out. The remaining paper wheel sets 2, such as the paper wheel sets A1, A2, and A3 in the embodiment, decelerate in advance when the tail end of the paperboard leaves. Figure 1 Since the paperboard leaves the paper wheel sets A1, A2, and A3 in turn, the starting points of the deceleration time of the paper wheel sets A1, A2, and A3 are sequentially delayed with time, so that the paperboard is decelerated in advance without causing excessive influence on the acceleration of the paperboard. The amount and time point of the deceleration of the paperboard in advance can be determined according to actual tests, for example, the time point when the paperboard leaves each paper wheel set 2 in one paper conveying cycle is determined by the torque feedback of the servo motor 21, then the time points of the acceleration section, the constant-speed section, and the deceleration section are determined according to the time point, and then the time point of the deceleration section is advanced to realize it. The time amount can be 10 ms to 3000 ms, etc.

[0040] In order to increase the friction between the paper wheel set 2 and the paperboard, and to more efficiently improve the acceleration efficiency of the paperboard, in step S1), the no-platform conveying mechanism further comprises a suction assembly, the suction assembly comprises a vacuum box and a vacuum pump, the vacuum box is arranged below the front baffle 1, the top surface of the vacuum box is provided with suction holes, the paper wheel set 2 is arranged in the vacuum box, the number of the suction holes corresponds to the number of each paper wheel included in the paper wheel set 2, the top end of each paper wheel extends out of the suction hole, and an air suction gap is left between each paper wheel and the suction hole. In this way, the suction assembly is arranged, the vacuum pump provides negative pressure in the vacuum box through the pipeline, the negative pressure acts on the paperboard between each paper wheel and the suction hole, and the negative pressure provided by the vacuum pump acts on the paper wheel around the paper wheel, which can more efficiently improve the contact force between the paperboard and the paper wheel set 2, and improve the conveying speed of the paperboard.

[0041] The vacuum box is provided with a controller, a pressure valve and a plurality of mutually isolated negative pressure chambers, each negative pressure chamber is connected with the vacuum pump through a pressure valve, each pressure valve is driven by the controller, and each group of paper wheel sets 2 is correspondingly located in a negative pressure chamber. The suction assembly increases the contact force between the paperboard and the paper wheel set 2, thereby improving the acceleration efficiency of the paperboard and improving the conveying efficiency of the paperboard. However, when the paper wheel set 2 is decelerated in advance, the increased force of the suction assembly will also aggravate the wear of the paperboard caused by the paper wheel set 2. Therefore, the suction assembly is further provided with a pressure valve and a controller to adjust the vacuum degree in the vacuum box, so as to reduce the vacuum degree of the vacuum box when the speed difference between the paper wheel set 2 and the paperboard occurs, thereby reducing the suction force of the paperboard and the contact force between the paperboard and the paper wheel set 2. In the scheme, a plurality of negative pressure chambers are arranged, each negative pressure chamber correspondingly accommodates a group of paper wheel sets 2, so that the negative pressure adjustment of the negative pressure chamber can correspondingly match a group of paper wheel sets 2, so as to reduce the adverse effects of adjusting the negative pressure on the efficient conveying of the paperboard, thereby making the control method have the advantages of efficient conveying of the paperboard and less damage to the paperboard.

[0042] Further, the negative pressure chamber corresponding to the paper feeding wheel A1, A2, A3, …, An is B1, B2, B3, …, Bn, and the negative pressure chamber comprises a vacuum degree adjusting period, and the vacuum degree adjusting period comprises a pressure increasing section, a constant pressure section and a pressure decreasing section. In step S2), all the negative pressure chambers enter the pressure increasing section and the suction force is increased to the paper feeding vacuum degree K1 by adjusting the pressure valve. In step S3), the paper feeding wheel group 2 is decelerated, and the negative pressure chamber corresponding to the paper feeding wheel group 2 enters the pressure decreasing section and the suction force is decreased to the paper supporting vacuum degree K2 by adjusting the pressure valve. The vacuum degree adjusting period is configured for the negative pressure chamber, and each negative pressure chamber can adjust the vacuum degree in matching with the corresponding paper feeding wheel group 2, so that the contact force between the paper feeding wheel group 2 and the paperboard can be reduced when the speed difference between the paper feeding wheel group 2 and the paperboard occurs. Since the paper feeding wheel at the front does not generate the speed difference with the paperboard when working, the corresponding negative pressure chamber does not need to be decompressed after reaching the paper feeding vacuum degree K1.

[0043] Further, in the embodiment, the timing of the pressure decreasing section is earlier than that of the deceleration section. The timing of the pressure decreasing section being earlier than that of the deceleration section means that after the action period is determined, the paper feeding wheel group 2 enters the deceleration section only after the corresponding negative pressure chamber enters the pressure decreasing section, so that the contact force between the paperboard and the paper feeding wheel group 2 is reduced when the speed difference between the paper feeding wheel group 2 and the paperboard occurs, thereby further reducing the wear of the paperboard and the paper feeding wheel group 2 caused by the speed difference. Specifically, the timing of the pressure decreasing section can be 30-200 ms earlier than that of the deceleration section.

[0044] The preferred embodiments of the application are described above, but the application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application. The equivalent modifications or replacements are all included in the scope defined by the claims of the application.

Claims

1. A method of controlling a platenless paperboard conveying mechanism, characterized by: It comprises the following steps: S1): configure a no-platform conveying mechanism, the no-platform conveying mechanism comprises a front baffle (1), a tail baffle (3), and a plurality of groups of paper feeding wheel groups (2), each group of the paper feeding wheel groups (2) is driven by an independent servo motor (21), and the paper feeding wheel groups (2) are linearly spaced along the conveying direction of the paperboard; a paper feeding gap through which only a single paperboard can pass is arranged between the lower end of the front baffle (1) and the paper feeding wheel groups (2), each group of the paper feeding wheel groups (2) is defined as A1, A2, A3, …, An along the conveying direction, and the action period of the paper feeding wheel groups (2) comprises an acceleration section, a constant speed section, and a deceleration section; in step S1), the no-platform conveying mechanism further comprises a suction assembly, the suction assembly comprises a vacuum box and a vacuum pump, the vacuum box is arranged below the front baffle (1), the top surface of the vacuum box is provided with suction holes, the paper feeding wheel groups (2) are arranged in the vacuum box, the number of the suction holes corresponds to the number of each paper feeding wheel included in the paper feeding wheel groups (2), and the top end of each paper feeding wheel extends out of the suction hole, and an air suction gap is left between each paper feeding wheel and the suction hole; the vacuum box is provided with a controller, a pressure valve, and a plurality of mutually isolated negative pressure chambers, each negative pressure chamber is connected to the vacuum pump through a pressure valve, and each pressure valve is driven by the controller, and each group of paper feeding wheel groups (2) is correspondingly located in a negative pressure chamber; S2): all the paper feeding wheel groups (2) are synchronously accelerated to the machine speed in the acceleration section, enter the constant speed section, and drive the paperboard located at the lowermost part to accelerate; S3): in the constant speed section, the paperboard is driven by the paper feeding wheel to gradually leave each paper feeding wheel group (2), part of the paper feeding wheel groups (2) start to decelerate and enter the deceleration section before the tail end of the paperboard leaves the paper feeding wheel group (2), and the speed of the paperboard only drops to 0 after the paperboard leaves the paper feeding wheel group (2); the corresponding negative pressure chambers of the paper feeding wheel groups A1, A2, A3, …, An are B1, B2, B3, …, Bn, the negative pressure chambers comprise a vacuum degree adjustment period, the vacuum degree adjustment period comprises a pressure increasing section, a constant pressure section, and a pressure decreasing section, in step S2), in the acceleration section, all the negative pressure chambers enter the pressure increasing section and the suction force rises to the paper feeding vacuum degree K1 by adjusting the pressure valve; in step S3), the paper feeding wheel groups (2) decelerate at the same time, the negative pressure chamber corresponding to the paper feeding wheel group (2) enters the pressure decreasing section, and the suction force decreases to the paper holding vacuum degree K2 by adjusting the pressure valve.

2. A method of controlling a tableless paperboard transport mechanism according to claim 1, characterized in that: It further comprises step S4): after the paperboard located at the lowermost part is fed out by the paper feeding wheel group (2), the second paperboard (D2) moves downward under the action of gravity and suction to become a new paperboard located at the lowermost part, and then the steps S2) and S3) are cycled.

3. A method of controlling a tableless paperboard transport mechanism according to claim 1, characterized in that: The timing of the pressure decreasing section is earlier than that of the deceleration section.

4. A method of controlling a tableless paperboard transport mechanism according to claim 1, characterized in that: Adjacent groups of the paper feeding wheel groups (2) are staggered with each other.

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