A gluing device for corrugated board production and application method thereof

Abstract

A coating equipment for corrugated cardboard production includes an electrically driven guide roller, a glue supply mechanism, a coating roller, an electric push rod, an air compressor, and a solenoid valve. It also includes a detection mechanism, a control circuit, and a glue residue detection mechanism. The upper end of the electric push rod is mounted together with both sides of the coating roller. The electric push rod is installed in front of the support frames on both sides of a set of electrically driven guide rollers at the rear end. The glue inlets of the two sets of coating rollers are connected to one end of a first solenoid valve via a valve, a hose connected in series, and the glue supply mechanism includes a glue tank, a glue delivery pipe, a pressure switch, and a glue adding pipe, all mounted together. Each detection mechanism includes a spring and a pressure resistor, all mounted together. The glue residue detection mechanism includes a glue receiving plate, a linear bearing, a pressure sensor, and an indicator circuit, all mounted together. The coating method of this corrugated cardboard coating equipment includes three steps. This invention can simultaneously coat the upper and lower layers of the core paper interlayer, improving work efficiency and coating quality, and alerting workers when excessive glue drips.

Description

Technical Field

[0001] This invention relates to the field of corrugated board production technology, and in particular to a coating equipment and application method for corrugated board production. Background Technology

[0002] Corrugated cardboard is a multi-layered paper bond. It consists of at least one corrugated (including rectangular, triangular, trapezoidal, etc.) core paper layer (commonly known as corrugated sheet, corrugated paper core, corrugated base paper) and two layers of cardboard (also known as boxboard, boxboard). It has high mechanical strength and can withstand collisions and drops during handling. The actual performance of a carton made of corrugated cardboard depends on three factors: the characteristics of the core paper and the cardboard, and the structure of the carton itself.

[0003] In actual corrugated board production, glue needs to be applied to both the top and bottom edges of the core paper layer. Then, the core paper layer is bonded to the bottom and top edges of the two cardboard layers to form the corrugated board. Current technology involves applying glue to the top and bottom edges of the core paper layer manually or mechanically. Manual methods are inefficient and are typically only used in small corrugated board manufacturers. Mechanical glue-applying equipment for the top and bottom edges of the core paper interlayer typically consists of two sets of electrically driven guide rollers positioned vertically at the front and rear ends of the working area. Each set of two guide rollers has grooves and protrusions arranged in a ring on its surface, matching the shape and depth of the top and bottom edges of the core paper interlayer. Before applying glue to core paper interlayers of different heights, the operator adjusts the spacing between the two guide rollers in each set. The operator feeds the core paper interlayer to be glued from the rear end of the rear guide roller. The glue-applying roller between the front and rear guide rollers applies glue to the top edge of the core paper interlayer. After the glue is applied, the front guide roller pulls the core paper interlayer forward (the front guide roller also has the function of dispersing the glue evenly), proceeding to the next core paper interlayer for glue application to the bottom edge. Finally, the core paper interlayer is bonded to the two layers of cardboard and dried. While existing mechanical glue-applying rollers meet the glue-applying needs of the core paper interlayer to some extent, some specific technical problems still exist due to structural limitations. Specifically, the glue-applying roller can only apply glue to the upper end of the core paper interlayer at a time. This requires other mechanisms to move the upper end of the core paper interlayer to the lower end after the upper end has been glued (the upper end glues the wavy, convex part of the core paper interlayer, while the lower end glues the flat part of the core paper interlayer). Only then can the lower end of the core paper interlayer, which is currently at the upper end, be glued. This working mode cannot apply glue to the upper and lower ends of the core paper interlayer simultaneously, which is not conducive to improving work efficiency and makes the overall production equipment relatively more complex. Furthermore, the existing glue-applying roller height is fixed. Before applying glue to core paper layers with different corrugation heights, technicians need to adjust the height of the glue-applying roller. This operation can cause inconvenience to the relevant technicians. More importantly, if the relevant technicians lack experience and fail to adjust the glue-applying roller properly, the gap between the lower end of the glue-applying roller and the upper end of the core paper layer may be too large or too small during subsequent glue application, resulting in a poor glue application effect on the core paper layer. (In actual production, the lower end of the glue outlet of the glue-applying roller needs to be in contact with the upper glue application area of ​​the core paper layer. If the gap is too large, the glue cannot be effectively applied to the upper glue application area of ​​the core paper layer. After the glue drips onto the side of the upper glue application area, it will not only affect the glue application effect of the corresponding glue application area of ​​the core paper layer, but also cause unnecessary glue waste. If the gap is too small, it may cause the glue-applying roller to apply too much pressure to the core paper layer, causing it to deform and affecting the quality of the finished corrugated board.) Summary of the Invention

[0004] To overcome the shortcomings of existing corrugated cardboard production, such as low work efficiency, complex production equipment, and high cost due to the inability to simultaneously apply glue to the upper and lower layers of the core paper sandwich layer, and the inability to effectively ensure that the glue outlet of the glue roller is aligned with the glued area of ​​the core paper sandwich layer, resulting in unreliable glue quality, this invention provides a glue application device and method for corrugated cardboard production. This method, through the combined action of relevant mechanisms, enables simultaneous glue application to the upper and lower layers of the core paper sandwich layer, improving work efficiency. Furthermore, it utilizes relatively simple and low-cost production equipment and effectively ensures that the glue outlet of the upper and lower glue rollers is aligned with the glued area of ​​the core paper sandwich layer, thereby improving glue quality.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A coating equipment for corrugated cardboard production includes an electrically driven guide roller, a glue supply mechanism, a coating roller, an electric push rod, an air compressor, and a solenoid valve. Its distinguishing feature is that it further includes a detection mechanism, a control circuit, and a glue residue detection mechanism. The coating roller has at least two sets and multiple sets of electric push rods. One end of the coating roller is closed, and the other end has a glue inlet. Glue outlet pipes are installed at intervals at the lower end of the coating roller, and each outlet pipe has a coating pipe at its lower end, with multiple glue outlet holes at the lower end of each pipe. Of the multiple sets of electric push rods, the upper ends of two sets and the other two sets are respectively mounted to the outer ends of the two coating rollers on both sides. The multiple sets of electric push rods are respectively installed... At the upper and lower front ends of the support frames on both sides of the rear set of electrically driven guide rollers, the glue application pipes of one set and another set of glue application rollers are respectively located between the lower side of the upper guide roller and the upper side of the lower guide groove; there are at least two solenoid valves, and the glue inlets of the two sets of glue application rollers are respectively connected to one end of a valve, and the other ends of the two valves are respectively connected in series via hoses to one end of the first solenoid valve; the glue supply mechanism includes a glue tank, a glue delivery pipe, a pressure switch, and a glue dispensing pipe. The glue tank is installed on the side of the rear set of electrically driven guide rollers, the lower end of the glue dispensing pipe and the air inlet pipe of the pressure switch, and one end of the second solenoid valve are respectively installed on the upper end of the glue tank, the upper end of the glue dispensing pipe is equipped with a sealing cap, and one end of the glue delivery pipe is equipped with At the lower end of one side of the glue tank, the other end of the glue delivery pipe is connected to the other end of the first solenoid valve, and the other end of the second solenoid valve is connected to the exhaust pipe of the air compressor; the detection mechanism includes at least two sets, each set including a spring and a pressure resistor, two sets of glue application rollers are equipped with guide seats, one end of the glue outlet pipe of one of the two sets of glue application rollers is slidably sealed inside the guide seat, a support plate is installed on one side of one of the glue outlet pipes, one end of the spring of each of the two detection mechanisms is respectively installed on the support plate, one side of each of the two guide seats is respectively installed with a fixing plate, and the pressure resistors of each of the two detection mechanisms are respectively installed on the two fixing plates; the glue residue detection mechanism includes a glue receiving plate and a linear bearing. The system includes a pressure sensor and an indicator circuit. The bearing housing of the linear bearing is installed inside the support frame of a set of electrically driven guide rollers at the rear end. The upper end of the bearing rod of the linear bearing is installed at the lower end of the rubber receiving plate. The pressure sensor is installed on the side end of the bearing housing of the linear bearing. The control circuit and the indicator circuit are installed inside the control box. The power output terminal of the pressure switch is electrically connected to one power input terminal of the second solenoid valve. The signal output terminal of the pressure sensor is electrically connected to the signal input terminal of the indicator circuit. The signal output terminals of the two pressure resistors are electrically connected to the two signal input terminals of the control circuit. The multiple power output terminals of the control circuit are electrically connected to the power input terminals of multiple sets of electric push rods.

[0007] Preferably, the solenoid valve is a normally closed solenoid valve; glue is added to the glue tank; the other ends of the springs of the two sets of detection mechanisms are in contact with the pressure resistor force-bearing surfaces of the two sets of detection mechanisms respectively, with the pressure resistor force-bearing surface of the upper set of detection mechanisms facing down and the pressure resistor force-bearing surface of the lower set of detection mechanisms facing up.

[0008] Preferably, when the springs of the two detection mechanisms are not compressed, the lower side of the glue outlet tube in the upper set of glue-applying roller guide seat and the upper side of the glue outlet tube in the other set of glue-applying roller guide seat are respectively on the same plane as the lower side of the remaining glue-applying tubes of the upper set of glue-applying roller and the upper side of the remaining glue-applying tubes of the lower set of glue-applying roller.

[0009] Preferably, the upper end of the pressure sensor's force-bearing surface is in contact with the lower end of the adhesive plate.

[0010] Preferably, the control circuit includes electrically connected resistors, adjustable resistors, and a microcontroller module. One end of each of the two adjustable resistors is connected to one end of each of the two resistors and two signal input terminals of the microcontroller module, and the other end of each of the two resistors is connected to the negative power input terminal of the microcontroller module. The microcontroller module can also be replaced by either a PLC or a host computer.

[0011] Preferably, the prompting circuit includes a microcontroller module, an adjustable resistor, an alarm, and an alarm that are electrically connected. The power input terminal of the alarm is connected to the power output terminal of the microcontroller module. One end of the adjustable resistor is connected to one end of the resistor and the signal input terminal of the microcontroller module. The negative power input terminal of the microcontroller module is connected to the other end of the resistor.

[0012] A gluing method for a gluing equipment used in corrugated cardboard production, characterized by the following steps: S1: The core paper interlayer to be glued is fed between the rear ends of two guide rollers, and the core paper interlayer moves forward after being pulled and glued by the two guide rollers at the front end; S2: Compressed air from an air compressor enters the glue tank, and pressurized glue enters the interior of two gluing rollers through two valves respectively. Pressurized glue is simultaneously output from the lower side of the gluing tube of the upper gluing roller and the upper side of the gluing tube of the lower gluing roller to simultaneously glue the upper and lower layers of the core paper interlayer; S3: The pressure resistors of two sets of detection mechanisms simultaneously detect the pressure applied to the upper and lower layers of the core paper interlayer by one of the gluing tubes of the two sets of gluing rollers. When the pressure is too high, the electric push rod can be controlled to drive the upper set of gluing rollers upward and the lower set of gluing rollers downward respectively. When the pressure is too low, the electric push rod can be controlled to drive the upper set of gluing rollers downward and the lower set of gluing rollers upward respectively, thereby ensuring the gluing effect while reducing the probability of damaging the core paper interlayer.

[0013] Preferably, in step S2, an upper set of glue-applying rollers applies glue to the wavy, convex portion of the core paper interlayer, and a lower set of glue-applying rollers applies glue to the flat portion of the lower side of the core paper interlayer.

[0014] Preferably, in step S2, the pressure switch can monitor the pressure inside the glue tank. When the pressure is lower than the threshold, the second solenoid valve opens and the air compressor pressurizes the glue tank. When the pressure is higher than the threshold, the second solenoid valve closes and the air compressor stops pressurizing the glue tank.

[0015] Preferably, in step S2, the glue residue detection mechanism monitors the glue application amount of the lower set of glue application rollers in real time. When the glue amount is too high, it can alarm the staff and adjust the opening and closing degree of the valve core of the second valve to prevent glue waste.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention is based on two sets of electrically driven guide rollers set at the front and rear ends of the working area. When working, the two glue-applying rollers distributed vertically can simultaneously apply glue to the upper and lower layers of the core paper interlayer, which improves the working efficiency. The production equipment used is relatively simple and low in cost. Under the action of two sets of detection mechanisms, it can also effectively ensure that the glue outlet of the upper and lower glue-applying rollers fits the glue-applying part of the core paper interlayer, which improves the glue-applying quality. (2) Due to the effect of gravity and the absence of the core paper interlayer blocking effect, when there is too much glue in the glue tank, the lower set of glue-applying rollers will drip onto the glue receiving plate of the glue residue detection mechanism. When too much glue drips per unit time, the prompting circuit and alarm can prompt the staff to adjust the glue output of the second manual valve, which prevents glue waste. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of a coating equipment for corrugated cardboard production according to the present invention;

[0019] Figure 2 This is a partial structural schematic diagram of a coating equipment for corrugated cardboard production according to the present invention;

[0020] Figure 3 This is a circuit diagram of a coating equipment for corrugated cardboard production according to the present invention. Detailed Implementation

[0021] Figures 1-3As shown, a coating equipment for corrugated cardboard production includes two sets of electrically driven guide rollers 1 with two guide rollers arranged vertically at the front and rear ends of the working area, a power module T1, a glue supply mechanism, a coating roller 3, an electric push rod, an air compressor (not shown in the figure), and solenoid valves DC1 and DC2. It also includes a detection mechanism, a control circuit 4, and a glue residue detection mechanism. There are two sets of coating rollers 3 and four sets of electric push rods. The left end of the coating roller 3 is a closed structure, and the right end has a glue inlet 31. At regular intervals, the lower end of the coating roller 3 is vertically welded with glue outlet pipes 32 that communicate with its interior. The lower end of each glue outlet pipe 32 is horizontally welded with a glue outlet pipe that communicates with its interior. Interconnected glue-applying tubes 33, each with multiple glue outlet holes 34 spaced apart at its lower end; the upper ends of the push rods of two sets of electric push rods M1 are respectively welded to the lower left and right sides of the outer surface of one set of glue-applying rollers 3, with the glue-applying tubes 33 of one set of glue-applying rollers located on the lower side; the upper ends of the push rods of the other two sets of electric push rods M2 are respectively welded to the lower left and right sides of the outer surface of the lower end of another set of glue-applying rollers 3, with the glue-applying tubes 33 of the other set of glue-applying rollers located on the upper side; the rear sides of the cylinders of two sets and the other two sets of electric push rods are respectively installed on the upper and lower parts of the front side of the left and right end support frames 101 of the rear set of electrically driven guide rollers, and the glue-applying tubes 33 of the other set of glue-applying rollers are respectively installed on the upper and lower parts of the rear side of the support frames 101 of the rear set of electric drive guide rollers, and the glue-applying tubes 33 of the other set of electric push rods are respectively installed on the upper and lower parts of the rear side of the support frames 101 of the rear set of electric drive guide rollers, and the glue-applying tubes 33 of the other set of electric push rods are respectively installed on the lower ... The glue-applying pipes 33 of the glue rollers are located between the lower side of the upper guide roller 1 and the upper side of the lower guide groove 1. There are two solenoid valves; the right side of the glue inlet 31 of each of the two glue-applying rollers 3 is threaded to one end of a manual valve 5. The other ends of the two manual valves 5 are connected in series via a flexible hose 6 (ensuring the electric push rod can drive the glue-applying rollers up or down with some clearance) and a three-way pipe, with both ends connected via pipes. The third end of the three-way pipe is connected via a pipe to one end of the first solenoid valve DC1. The other end of the first solenoid valve DC1 is threaded with a glue inlet pipe 7. The glue supply mechanism includes a glue tank 21, a glue delivery pipe 22, a pressure switch D, and a glue adding pipe 23. 21 is installed on the right side of a set of electrically driven guide rollers 1 at the rear end. The lower end of the glue-adding pipe 23, the lower end of the air inlet pipe of the pressure switch D, and the connecting pipe of the lower end of the second solenoid valve DC2 are respectively welded to the upper left and right sides of the glue tank 21. The glue-adding pipe 23, the air inlet pipe of the pressure switch D, the connecting pipe of the second solenoid valve DC2 and the glue tank 21 are interconnected. A sealing cap 24 is installed on the upper end of the glue-adding pipe 21 by thread. The right side of the glue outlet pipe 22 is welded to the middle of the lower left end of the glue tank 21. The left side of the glue delivery pipe 22 and the right side of the glue inlet pipe 7 of the first solenoid valve are installed together by pipe joints. The other end of the second solenoid valve DC2 is connected to the exhaust pipe of the air compressor by pipe.The detection mechanism comprises two sets, each including a spring 81 and pressure resistors RT1 (RT2). A cylindrical guide seat 35, communicating with the interior of each roller, is welded to the middle of both sets of coating rollers. One end of the glue outlet tube 32 of one of the two rollers is slidably sealed within the guide seat 35, with the outlet tube located inside the guide roller. A hollow limiting plate 36, with an outer diameter larger than the inner diameter of the guide seat (to prevent the outlet tube from detaching from the guide seat), is welded to the outer side of the other end of the outlet tube. A support plate 37 is welded laterally to the right side of the outlet tube. One end of each spring 81 of the two detection mechanisms is welded to one of the two support plates 37. A fixing plate 38 is welded to the outer right side of each of the two guide seats. The pressure of the two detection mechanisms... Resistors RT1 (RT2) are insulated and mounted on two fixed plates 38 respectively; the glue residue detection mechanism includes a glue receiving plate 91, linear bearings 92, pressure sensor T3, and a prompting circuit 93. The bearing housings of the two sets of linear bearings 92 (with the bearing rods slidingly fitted inside the bearing housings) are respectively mounted on the inner middle of the two support frames 101 of the rear set of electrically driven guide rollers. The upper ends of the bearing rods of the two sets of linear bearings 92 are respectively mounted on the lower end of the glue receiving plate 91. The pressure sensor T3 is mounted on the rear end of the bearing housing of the left linear bearing 92; the power module T1, control circuit 4, and prompting circuit 93 are mounted on the circuit board inside the control box 10, which is mounted on the front outer end of the glue tank 21.

[0022] Figures 1-3As shown, solenoid valves DC1 and DC2 are normally closed solenoid valves; glue is added to the glue tank 21 through the opening of the sealing cover 24 and the glue application tube 23; the other ends of the springs 81 of the two sets of detection mechanisms are in contact with the force-bearing surfaces of the pressure resistors RT1 (RT2) of the two sets of detection mechanisms, with the force-bearing surface of the pressure resistor RT1 of the upper set of detection mechanisms facing downwards and the force-bearing surface of the pressure resistor RT2 of the lower set of detection mechanisms facing upwards. When the springs 81 of the two sets of detection mechanisms are not compressed, the lower side of the glue-dispensing tube 33 of the remaining glue-dispensing tubes of the upper set of glue-dispensing rollers and the upper side of the remaining glue-dispensing tubes of the lower set of glue-dispensing rollers are respectively on the same plane as the lower side of the remaining glue-dispensing tubes 33 of the upper set of glue-dispensing rollers and the upper side of the remaining glue-dispensing tubes 33 of the lower set of glue-dispensing rollers. The upper end of the force-bearing surface of the pressure sensor T3 is in contact with the lower left side of the glue receiving plate 91. The control circuit includes resistors R1 and R2, adjustable resistors RP1 and RP2, and a microcontroller module T2 connected by wires. One end of each of the two adjustable resistors RP1 and RP2 is connected to one end of each of the two resistors R1 and R2, and to two signal input terminals (pins 3 and 4) of the microcontroller module T2. The other end of each of the two resistors R1 and R2 is connected to the negative power input terminal (pin 2) of the microcontroller module T2. The microcontroller module can also be replaced by a PLC or a host computer. The alert circuit includes a microcontroller module T4, adjustable resistor RP3, resistor R3, and an alarm BT connected by circuit board wiring. The power input terminal of the alarm BT is connected to the power output terminals (pins 4 and 5) of the microcontroller module T4. One end of the adjustable resistor RP3 is connected to one end of resistor R3, and to the signal input terminal (pin 3) of the microcontroller module T4. The negative power input terminal (pin 2) of the microcontroller module T4 is connected to the other end of resistor R3. Figure 3 In this configuration, the adjustable resistors RP1, RP2, and RP3 have a resistance of 100K ohms (adjusted to 19K, 19K, and 9K ohms respectively in this embodiment); the resistors R1, R2, and R3 have resistances of 3K ohms, 3K ohms, and 2K ohms respectively; the power module T1 is an AC 220V to DC 24V power module; the solenoid valves DC1 and DC2 are 1W normally closed solenoid valves; the pressure switch D is an adjustable normally closed contact pressure switch; the electric towing rods M1 and M2 are 100W reciprocating electric telescopic rods; the alarm BT is a high-decibel continuous sound alarm of model SFM-27; the microcontroller modules T2 and T4 are model STM32F103C8T6; the pressure sensor T3 is a high-precision pressure weighing sensor of model DYZ-100, which has two power input terminals and one signal output terminal; the pressure resistors RT1 and RT2 are high-precision resistive strain gauges of model BX120-3AA.

[0023] Figures 1-3As shown, the power input terminals 1 and 2 of power module T1 are connected to the two poles of the 220V AC power supply via wires. The power output terminals 3 and 4 of power module T1 are connected to the power input terminals 1 and 2 of pressure sensor T3, the power input terminals of microcontroller module T4 (for the indication circuit), the power input terminals of microcontroller module T2 (for the control circuit), and the power input terminal of pressure switch D via wires. The power output terminal of pressure switch D is connected to the negative power output terminal 4 of power module T1 and the power input terminal of the second solenoid valve DC2 via wires. The power input terminal of the first solenoid valve DC1 is connected in series with a power switch S1 and to the power output terminals 3 and 4 of power module T1 via wires. The signal output pin 3 of pressure sensor T3 and the other end of the adjustable resistor RP3 of the signal input terminal of the indication circuit are connected by a wire. One end of the two pressure resistors RT1 and RT2 is connected to the positive power input terminal of the microcontroller module T2 by a wire, and the other ends of the two pressure resistors RT1 and RT2 are connected to the other ends of the adjustable resistors RP1 and RP2 by wires respectively. The four power output terminals of the control circuit are connected to pins 5 and 6, pins 7 and 8, pins 9 and 10, and pins 11 and 12 of the microcontroller module T2, and the positive and negative and negative and positive power input terminals of two sets of electric actuators M1 and the other two sets of electric actuators M2 by wires respectively.

[0024] Figures 1-3As shown, after the AC 220V power supply enters the power input terminal of the power module T1, the power module T1 outputs a stable DC 24V power supply through pins 3 and 4, which then enters the power input terminals of the pressure sensor T3, the indication circuit, the control circuit, and the pressure switch D. After opening the power input terminals of the two sets of electrically driven guide rollers 1, the worker feeds the core paper interlayer that needs to be coated with glue between the two rear guide rollers 1. The two front guide rollers 1 pull and apply the glue, and the core paper interlayer moves forward (the front guide rollers also have the function of dispersing the glue evenly), entering the next core paper interlayer's lower end glue application process, and finally entering the core paper interlayer and two layers of cardboard bonding and drying process. Open the valve cores of both manual valves 5 (and turn on the power switch S1 of solenoid valve DC1, energizing the valve core of solenoid valve DC1). Compressed air output from the air compressor enters the glue tank 21. Pressurized glue enters the two coating rollers 3 through the two manual valves 5. Multiple coating holes on the lower side of the coating tube 33 at the lower end of the upper coating roller and multiple coating holes on the upper side of the coating tube 33 at the upper end of the lower coating roller simultaneously output glue with a certain flow rate and pressure to simultaneously coat the upper and lower layers of the core paper interlayer. In actual situations, when the height of the upper or lower end of the core paper interlayer changes, one of the upper glue outlet tubes or one of the lower glue outlet tubes will change synchronously with the height of the upper or lower end of the core paper interlayer via the coating tube (when the height of the upper end of the core paper interlayer increases or the height of the lower end decreases, one of the upper glue outlet tubes moves upward along the guide seat, and one of the lower glue outlet tubes moves downward along the guide seat). When the distance between the two sets of detection mechanisms at the upper or lower ends of the glue-coating tube and the core paper interlayer is relatively large (or when the contact surface between the upper or lower ends of the two sets of glue-coating tubes and the core paper interlayer is very small), the pressure surface of the upper pressure resistor RT1 or the lower pressure resistor RT2 is relatively low due to the compression of the spring 81 of the upper or lower set of detection mechanisms. As a result, the resistance value of the upper pressure resistor RT1 or the lower pressure resistor RT2 is relatively large. The voltage drop of the 24V power supply through the pressure resistor RT1, the adjustable resistor RP1 and the resistor R1 is large, or the voltage drop of the 24V power supply through the pressure resistor RT2, the adjustable resistor RP2 and the resistor R2 is relatively large. Thus, the voltage signal entering pin 3 or 4 of the microcontroller module T2 is relatively low (e.g., below 3V).When the distance between the two sets of detection mechanisms at the upper or lower ends of the glue-coating tube and the core paper interlayer is relatively small (or when the contact surface between the upper or lower ends of the two sets of glue-coating tubes and the core paper interlayer is large), the force on the upper pressure resistor RT1 or the lower pressure resistor RT2 is relatively high due to the compression of the spring 81 of the upper or lower set of detection mechanisms (although the spring can absorb some of the force after being compressed, the force acting on the pressure resistor will still increase). The resistance value of the pressure resistor RT1 or the pressure resistor RT2 is relatively small, and the voltage division of the 24V power supply through the pressure resistor RT1, the adjustable resistor RP1 and the resistor R1 is small, or the voltage division of the 24V power supply through the pressure resistor RT2, the adjustable resistor RP2 and the resistor R2 is small. Thus, the voltage signal entering pin 3 or 4 of the microcontroller module T2 is relatively high (e.g., higher than 3V). When the two sets of detection mechanisms are appropriately spaced at the upper or lower ends of the glue-coating tube and the core paper interlayer (that is, the contact surfaces of the two sets of glue-coating tubes and the core paper interlayer are appropriate and in complete contact), the force exerted by the spring 81 of the upper or lower set of detection mechanisms on the pressure resistor RT1 or pressure resistor RT2 is relatively appropriate, the resistance value of pressure resistor RT1 or the lower pressure resistor RT2 is relatively appropriate, and the 24V power supply is appropriately divided between pressure resistor RT1, adjustable resistor RP1 and resistor R1, or the 24V power supply is appropriately divided between pressure resistor RT2, adjustable resistor RP2 and resistor R2. In this way, the voltage signal entering pin 3 or 4 of the microcontroller module T2 is relatively appropriate (for example, 3V). When the voltage signal input to pin 3 or 4 of the microcontroller module T3 is lower than 3V, pins 5 and 6 or pins 11 and 12 of the microcontroller module T3 will output power to the positive and negative power input terminals of two sets of electric push rods M1 or the negative and positive power input terminals of the other two sets of electric push rods M2. Two sets of electric push rods M1 drive the upper set of glue-applying rollers downward, and the other two sets of electric push rods M2 drive the lower set of glue-applying rollers upward. When the spacing is appropriate, and the signal voltage entering pin 3 or 4 of the microcontroller module is 3V, pins 5 and 6 or pins 11 and 12 of the microcontroller module T3 will stop outputting power, and the spacing between the glue-applying tubes and the upper or lower end of the core paper interlayer of the two detection mechanisms will be in a suitable state. When the voltage signal output from pin 3 or 4 of the microcontroller module T3 is higher than 3V, pins 7 and 8 or pins 9 and 10 of the microcontroller module T3 will output power to the positive and negative power input terminals of two sets of electric push rods M1 or the positive and negative power input terminals of the other two sets of electric push rods M2. Two sets of electric push rods M1 drive the upper set of glue-coating rollers upward, and the other two sets of electric push rods M2 drive the lower set of glue-coating rollers downward. When the spacing is appropriate, and the signal voltage entering pin 3 or 4 of the microcontroller module is 3V, pins 7 and 8 or pins 9 and 10 of the microcontroller module T3 stop outputting power, and the spacing between the glue-coating tubes and the upper or lower end of the core paper interlayer of the two detection mechanisms is in a suitable state.As described above, during operation, this invention enables simultaneous gluing of the upper and lower layers of the core paper interlayer using two vertically distributed gluing rollers, improving work efficiency. The production equipment used is relatively simple and low-cost. Furthermore, the two detection mechanisms effectively ensure that the glue outlets of the upper and lower gluing rollers adhere to the gluing area of ​​the core paper interlayer, improving gluing quality. In practice, technicians can modify the program data within the microcontroller module T2 to set the output power of the four power output terminals corresponding to the relative magnitude of the input voltage signal. This allows for the setting of the distance and contact force threshold between the gluing tubes of the two detection mechanisms and the upper or lower end of the core paper interlayer, as needed, to achieve better gluing results. It should be noted that the transverse interface heights at the upper and lower ends of the core paper interlayer are consistent. When the glue-coating tubes of the two sets of glue-coating rollers contact the upper or lower end of the core paper interlayer, and when the height of the upper or lower end of the core paper interlayer increases or decreases, the remaining glue-coating tubes of the two sets of glue-coating rollers will deform other corresponding positions at the upper or lower end of the core paper interlayer. Therefore, this invention can automatically adjust the height of the glue-coating tubes of the upper and lower glue-coating rollers when the height of the upper or lower end of the core paper interlayer increases or decreases, and can also provide good protection for the core paper interlayer.

[0025] Figures 1-3As shown, in this invention, when the air pressure inside the glue tank 21 is lower than a certain level (e.g., lower than 0.2 MPa), the internal contacts of the pressure switch D close, thus energizing the solenoid valve DC2 and opening its valve core, allowing compressed air from the air compressor to enter the glue tank 21. When the air pressure inside the glue tank 21 is higher than a certain level (e.g., higher than 0.2 MPa), the internal contacts of the pressure switch D open, thus de-energizing the solenoid valve DC2 and opening its valve core, preventing compressed air from the air compressor from entering the glue tank 21. Through this process, the invention can maintain a suitable pressure inside the glue tank, ensuring a constant pressure and stable glue output from the two sets of glue-applying rollers (the operator adjusts the opening and closing degrees of the two sets of manual valves to ensure the amount and pressure of glue entering the two sets of glue-applying rollers are appropriate). When the lower coating roller applies glue to the core paper interlayer, if too much glue is output from the lower coating roller, it will drip onto the glue receiving plate 91 of the glue residue detection mechanism. The weight of the glue will act on the force-bearing surface of the pressure sensor T3 (guided by a linear bearing) through the glue receiving plate 91. The more glue on the glue receiving plate 91, the higher the voltage signal output by pin 3 of the pressure sensor T3 will be, and vice versa. When the production time is short and the amount of glue dripping is small, the voltage signal output by pin 3 of the pressure sensor T3 will be divided by the adjustable resistor RP3 and the resistor R3 and enter the signal input terminal pin 3 of the microcontroller module T4. The voltage will be relatively low (e.g., below 2V). Pins 4 and 5 of the microcontroller module T4 will not output power, and the alarm BT will not sound. When the production period is short and the amount of glue dripping is relatively large, the voltage signal output from pin 3 of pressure sensor T3 is divided by adjustable resistor RP3 and resistor R3 and enters the microcontroller module T4. The signal voltage is relatively high (e.g., higher than 2V). Pins 4 and 5 of microcontroller module T4 output power to the power input terminal of alarm BT. Alarm BT will be powered on and sound an alarm to remind the staff to adjust the second manual valve to reduce the amount of glue dispensed and prevent glue waste.

[0026] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. It will be apparent to those skilled in the art that the present invention is limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0027] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gluing device for corrugated cardboard production, comprising an electrically driven guide roller, a glue supply mechanism, a glue coating roller, an electric push rod, an air compressor, and a solenoid valve, characterized in that, It also includes a detection mechanism, a control circuit, and a glue residue detection mechanism; the coating roller has at least two sets and multiple sets of electric push rods. One end of the coating roller is a closed structure, and the other end has a glue inlet. Glue outlet pipes are installed at intervals at the lower end of the coating roller, and each glue outlet pipe has a coating tube installed at its lower end. Each coating tube has multiple glue outlet holes at its lower end. Of the multiple sets of electric push rods, the upper ends of two sets and the other two sets are respectively installed together with the outer ends of the two sets of coating rollers. The multiple sets of electric push rods are respectively installed on the upper and lower parts of the front end of the support frame of the rear set of electrically driven guide rollers. The coating tubes of the upper set of coating rollers and the lower set of coating rollers are respectively located at... Between the lower side of the upper guide roller and the upper side of the lower guide roller; there are at least two solenoid valves, with the glue inlets of the two sets of glue-applying rollers each connected to one end of a valve, and the other ends of the two valves connected in parallel via hoses to one end of the first solenoid valve; the glue supply mechanism includes a glue tank, a glue delivery pipe, a pressure switch, and a glue-adding pipe. The glue tank is installed on the side of a set of electrically driven guide rollers at the rear end. The lower end of the glue-adding pipe and the air inlet pipe of the pressure switch, and one end of the second solenoid valve are respectively installed on the upper end of the glue tank. A sealing cap is installed on the upper end of the glue delivery pipe. One end of the glue delivery pipe is installed on the lower side of one side of the glue tank, and the other end of the glue delivery pipe is connected to the other end of the first solenoid valve. The other end of the second solenoid valve is connected to... The air compressor's exhaust pipe is connected; the detection mechanism includes at least two sets, each set including a spring and a pressure resistor. Two sets of dispensing rollers are equipped with guide seats. One end of the dispensing tube of one of the two dispensing rollers is slidably sealed within the guide seat. A support plate is installed on one side of the dispensing tube. One end of the springs of both detection mechanisms is respectively mounted on the support plate, and the other end of the springs of both detection mechanisms is in contact with the force-bearing surface of the pressure resistors of the two detection mechanisms. Fixed plates are respectively installed on the outer ends of the two guide seats, and the pressure resistors of the two detection mechanisms are respectively mounted on the two fixed plates. The residual glue detection mechanism includes a glue receiving plate, a linear bearing, and a pressure... The sensor and indicator circuit are installed inside the support frame of a set of electrically driven guide rollers at the rear end. The upper end of the linear bearing rod is installed at the lower end of the rubber receiving plate. The pressure sensor is installed on the side end of the linear bearing seat. The control circuit and indicator circuit are installed in the control box. The power output terminal of the pressure switch and one power input terminal of the second solenoid valve are electrically connected. The signal output terminal of the pressure sensor and the signal input terminal of the indicator circuit are electrically connected. The signal output terminals of the two pressure resistors are electrically connected to the two signal input terminals of the control circuit. The multiple power output terminals of the control circuit and the power input terminals of multiple sets of electric push rods are electrically connected.

2. The gluing equipment for corrugated cardboard production according to claim 1, characterized in that, The solenoid valve is a normally closed solenoid valve; glue is added to the glue tank; the pressure resistor of the upper detection mechanism faces downwards, and the pressure resistor of the lower detection mechanism faces upwards.

3. The gluing equipment for corrugated cardboard production according to claim 1, characterized in that, When the springs of the two detection mechanisms are not compressed, the lower side of the glue outlet tube of the upper set of glue-applying roller guide seat and the upper side of the glue outlet tube of the lower set of glue-applying roller guide seat are respectively on the same plane as the lower side of the remaining glue-applying tubes of the upper set of glue-applying roller and the upper side of the remaining glue-applying tubes of the lower set of glue-applying roller.

4. The gluing equipment for corrugated cardboard production according to claim 1, characterized in that, The upper end of the pressure sensor's force-bearing surface contacts the lower end of the adhesive plate.

5. The gluing equipment for corrugated cardboard production according to claim 1, characterized in that, The prompting circuit includes a microcontroller module, an adjustable resistor, an alarm, and an alarm. The power input terminal of the alarm is connected to the power output terminal of the microcontroller module. One end of the adjustable resistor is connected to one end of the resistor and the signal input terminal of the microcontroller module. The negative power input terminal of the microcontroller module is connected to the other end of the resistor.

6. A coating method for a coating equipment used in corrugated cardboard production according to any one of claims 1-5, characterized in that, The process includes the following steps: S1: The core paper interlayer to be coated is fed between the rear ends of the two guide rollers. The two guide rollers at the front end pull the core paper interlayer forward after it is coated with glue; S2: Compressed air from the air compressor enters the glue tank. Pressurized glue enters the two coating rollers through two valves. Pressurized glue is simultaneously output from the lower side of the coating tube of the upper coating roller and the upper side of the coating tube of the lower coating roller to coat the upper and lower layers of the core paper interlayer simultaneously; S3: The pressure resistors of two sets of detection mechanisms simultaneously detect the pressure applied to the upper and lower layers of the core paper interlayer by one of the coating tubes of the two sets of coating rollers. When the pressure is too high, the electric push rod can be controlled to drive the upper set of coating rollers upward and the lower set of coating rollers downward. When the pressure is too low, the electric push rod can be controlled to drive the upper set of coating rollers downward and the lower set of coating rollers upward, ensuring the coating effect while reducing the chance of damaging the core paper interlayer.

7. The gluing method of a gluing equipment for corrugated cardboard production according to claim 6, characterized in that, In step S2, the upper set of glue-applying rollers applies glue to the wavy, convex portion of the core paper interlayer, while the lower set of glue-applying rollers applies glue to the flat portion of the lower side of the core paper interlayer.

8. The gluing method of a gluing equipment for corrugated cardboard production according to claim 6, characterized in that, In step S2, the pressure switch can monitor the pressure inside the glue tank. When the pressure is lower than the threshold, the second solenoid valve opens and the air compressor pressurizes the glue tank. When the pressure is higher than the threshold, the second solenoid valve closes and the air compressor stops pressurizing the glue tank.

9. The gluing method of a gluing equipment for corrugated cardboard production according to claim 6, characterized in that, In step S2, the glue residue detection mechanism monitors the glue application amount of the lower set of glue application rollers in real time. When the glue amount is too high, it can alarm the staff and adjust the opening and closing degree of the valve core of the second valve to prevent glue waste.

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