High-uniformity three-roller gluing mechanism

Abstract

The high-uniformity three-roller gluing mechanism comprises a bottom plate, a shell is fixedly connected to the upper surface of the bottom plate, a paperboard is inserted into one side of the shell and penetrates through the shell, a glue box is arranged at the bottom end of the interior of the shell, glue is arranged in the glue box, and the bottom end of the interior of the shell is provided with a glue outlet. And a driving roller is arranged above the center in the glue box. According to the high-uniformity three-roller gluing mechanism, through cooperation of a bottom plate, a shell, a paperboard, a glue box, glue, a driving roller, a liquid pushing unit, an electric appliance box and a liquid level sensor, a motor starts to operate to enable a lead screw to rotate, the lead screw can conduct threaded transmission on threaded cylinders, the two threaded cylinders move towards the center direction, and through transmission of inclined rods, the two threaded cylinders are driven to rotate; the supporting plate and the rubber sleeve can move upwards, and then the liquid level of glue in the glue box cannot be lowered, that is, the amount of the glue dipped and smeared in each circle of rotation of the driving roller is the same, and the gluing uniformity of the surface of a paperboard is improved.

Description

Technical Field

[0001] This utility model relates to the field of glue coating machine technology, specifically a high-uniformity three-roller glue coating mechanism. Background Technology

[0002] A glue coating machine, also known as an adhesive applicator, glue scraper, or automatic glue sprayer, is a mechanical device primarily used to apply liquid glue to the surface of textiles, cardboard boxes, or leather. There are many types of existing glue coating machines, such as drum glue coating machines, double-acting glue coating machines, and dual-station lifting glue coating machines. Currently, existing three-roller glue coating equipment for film-based composite paper cannot automatically control the glue supply, easily leading to glue waste. Furthermore, the different speeds of the three rollers can cause wrinkles in the composite paper, thus affecting subsequent processes.

[0003] To address the aforementioned shortcomings, a utility model patent (CN213700530U) discloses a three-roller coating device for film-type composite paper, relating to the field of composite paper coating technology. The device includes a coating box with two horizontally arranged driven rollers in the center of its inner cavity. A first connecting pipe with a U-shaped structure is located at the upper part of the inner cavity, with both ends positioned directly above the two driven rollers. A sealing shell is fixedly connected to both ends of the first connecting pipe, and the inner cavity of the sealing shell communicates with the inner cavity of the first connecting pipe. This utility model incorporates a rotating roller within the sealing shell, with a groove on its outer wall. The outer wall of the rotating roller is in close contact with the outer wall of the driven roller. The rotation of the driven roller drives the rotating roller to rotate, allowing glue to flow out of the groove from the inner cavity of the first connecting pipe. When the rotating roller stops rotating, the glue stops flowing out of the inner cavity of the first connecting pipe. Therefore, this device can automatically control the glue supply, thus avoiding glue waste.

[0004] However, the device still has some drawbacks in actual use. For example, when the active roller, which is responsible for the glue application, dips into the glue tank and applies the glue to the cardboard, the glue level in the glue tank will continuously drop. This will reduce the amount of water that the active roller can pick up, further reducing the amount of glue applied to the surface of the cardboard, and the uniformity of the glue application on the cardboard surface needs to be improved. Utility Model Content

[0005] The purpose of this invention is to provide a highly uniform three-roller coating mechanism to solve the problem mentioned in the background art where, during the process of the active roller, which performs the coating operation, dipping into the glue tank to apply glue to the paperboard, the glue level inside the glue tank continuously decreases. This results in a reduction in the amount of water dipped into the active roller, further reducing the amount of glue applied to the surface of the paperboard and thus requiring improvement in the uniformity of the glue coating on the paperboard surface.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-uniformity three-roller coating mechanism is designed, including a base plate, a housing fixed to the upper surface of the base plate, a cardboard inserted into one side of the housing, the cardboard penetrating the housing, a glue tank located at the bottom of the housing, the glue tank containing glue, an active roller located above the center of the glue tank, the upper outer wall of the active roller being in contact with the cardboard, a liquid pushing unit located at the bottom of the glue tank, a glue control unit located above one side of the glue tank, an electrical box fixed to the other side of the glue tank, and a liquid level sensor located above the glue, the liquid level sensor being connected to the glue control unit.

[0008] Preferably, the dispensing unit includes a support plate located inside the glue tank at the bottom. A rubber sleeve is fixedly fitted onto the outer wall of the support plate, and the outer wall of the rubber sleeve abuts against the inner wall of the glue tank. Diagonal rods are hinged to both sides of the lower surface of the support plate, and a threaded cylinder is hinged to the other end of the diagonal rod. A lead screw is threaded onto the inner wall of the threaded cylinder, and a motor is fixedly connected to one end of the lead screw. The motor is fixedly connected to the contact surface of the glue tank. A protruding cylinder is fixedly connected to the bottom of the outer wall of the threaded cylinder, and a crossbar is inserted into one side surface of the protruding cylinder. The crossbar passes through the protruding cylinder and is fixedly connected to the inner wall of the glue tank.

[0009] Preferably, the inner wall of the convex cylinder is uniformly and slidably engaged with multiple balls in an annular shape, and the balls are in contact with the outer wall of the crossbar.

[0010] Preferably, the adhesive control unit includes an electric push rod, which is mounted above one side surface of the adhesive tank. A strip plate is fixedly connected to the output end of the electric push rod. The lower surface of the strip plate is fixedly connected to the top of the liquid level sensor. Multiple scrapers are fixedly connected at equal intervals from front to back on the surface of the strip plate away from the electric push rod.

[0011] Preferably, the surface of the scraper facing the drive roller has an arc-shaped structure, and the arc-shaped structure has the same curvature as the outer wall of the drive roller.

[0012] Preferably, the maximum movement of the electric push rod is the same as the distance between the scraper and the drive roller.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This high-uniformity three-roller coating mechanism has the following advantages over traditional technology:

[0014] Through the coordination of the base plate, shell, cardboard, glue tank, glue, drive roller, liquid pushing unit, electrical box, and liquid level sensor, the cardboard to be coated is pulled through the shell at a constant speed. During this process, the drive roller rotates to pick up the glue from the glue tank and apply it to the surface of the cardboard. During this time, the liquid level sensor monitors the glue level inside the glue tank. When the glue level inside the glue tank drops, it generates a control signal to the motor. The motor starts running, causing the lead screw to rotate. The lead screw drives the threaded cylinders, and the two threaded cylinders move towards the center. Through the transmission of the inclined rod, the support plate and rubber sleeve move upward, thus preventing the glue level inside the glue tank from dropping. This ensures that the amount of glue picked up and applied per revolution of the drive roller is the same, thereby improving the uniformity of glue coating on the surface of the cardboard.

[0015] Through the cooperation between the base plate, housing, cardboard, glue tank, glue, drive roller, liquid pushing unit, glue control unit, electrical box and liquid level sensor, when the cardboard to be coated with glue requires a small amount of glue, the user can control the electric push rod to make the scraper of the strip plate approach the drive roller and contact the outer wall of the drive roller, which can scrape off the glue-coated part of the outer wall of the drive roller, thus achieving the effect of saving glue usage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 for Figure 1 A partial sectional view;

[0018] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0019] Figure 4 for Figure 2 Top view of the strip plate and scraper;

[0020] Figure 5 for Figure 2 A magnified view of a section at point B.

[0021] In the diagram: 1. Base plate, 2. Housing, 3. Cardboard, 4. Glue tank, 5. Glue, 6. Drive roller, 7. Liquid pushing unit, 701. Support plate, 702. Rubber sleeve, 703. Diagonal bar, 704. Threaded cylinder, 705. Lead screw, 706. Motor, 707. Convex cylinder, 708. Crossbar, 8. Glue control unit, 801. Electric push rod, 802. Strip plate, 803. Scraper, 9. Electrical box, 10. Liquid level sensor. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] See attached document Figure 1 , 2 5: In this embodiment, a high uniformity three-roller coating mechanism includes a base plate 1, a housing 2 fixedly attached to the upper surface of the base plate 1, a cardboard 3 inserted into one side of the housing 2, the cardboard 3 penetrating the housing 2, and feed ports on both sides of the housing 2 to supply the cardboard 3 through which it penetrates. A glue tank 4 is provided at the bottom inside the housing 2, and glue 5 is provided inside the glue tank 4. An active roller 6 is provided above the center of the glue tank 4. The active roller 6 is rotatably connected to the glue tank 4 and the housing 2 through ball bearings. It is worth noting that two transmission rollers are arranged horizontally above the inside of the housing 2 and are in contact with the surface of the cardboard 3. A transmission component is installed on the rear surface of the housing 2 to provide the required kinetic energy for the rotation of the active roller 6 and the transmission rollers. The specific transmission structure and principle have been clearly described in the prior art and will not be repeated here. This application does not involve any innovative improvement to its transmission structure, but only to improve the uniformity of the active roller 6 during the coating process.

[0024] The upper part of the outer wall of the active roller 6 is in contact with the cardboard 3. The lower part of the glue tank 4 is equipped with a liquid pushing unit 7. The upper part of one side of the glue tank 4 is equipped with a glue control unit 8. The other side surface of the glue tank 4 is fixedly connected to an electrical box 9. The electrical box 9 is equipped with a signal receiver for the liquid level sensor 10 and a module component for controlling the start and stop of the motor 706. The specific model is not limited, as long as it meets the requirements of use. The upper side of the glue 5 is equipped with a liquid level sensor 10. The liquid level sensor 10 is a photoelectric liquid level sensor. The specific model is not limited, as long as it meets the requirements of use. It is a new type of contact point liquid level measurement and control device developed based on the principle of reflection and refraction of light at the interface of two different media. It has many advantages such as simple structure, high positioning accuracy, no mechanical parts, no need for debugging, high sensitivity, corrosion resistance, low power consumption, and small size, and has been gradually recognized by the market. The liquid level sensor 10 is connected to the glue control unit 8. The outer shell of the liquid level sensor 10 is fixedly connected to the lower surface of the strip plate 802 in the glue control unit 8.

[0025] The dispensing unit 7 includes a tray 701, which is located inside the glue tank 4 at the bottom. A rubber sleeve 702 is fixedly fitted onto the outer wall of the tray 701. The rubber sleeve 702 is made of polytetrafluoroethylene rubber, which has extremely high corrosion resistance, chemical stability, and non-stick properties. Its surface energy is extremely low, making it difficult to be contaminated or adhered to by other substances. It is widely used in chemical, medical, and food industries. The outer wall of the rubber sleeve 702 abuts against the inner wall of the glue tank 4. Both sides of the lower surface of the tray 701 are hinged with inclined... The other end of the rod 703 is hinged to a threaded cylinder 704. The inner wall of the threaded cylinder 704 is threaded to a lead screw 705. The lead screw 705 is rotatably connected to the glue tank 4 through a bearing. The lead screw 705 is a double-ended lead screw with opposite thread directions on both sides of its outer wall. A motor 706 is fixedly connected to one end of the lead screw 705. The lead screw 705 is fixedly connected to the output shaft of the motor 706. The motor 706 is fixedly connected to the contact surface of the glue tank 4. The housing of the motor 706 is fixedly connected to the glue tank 4.

[0026] A protruding cylinder 707 is fixedly connected to the bottom of the outer wall of the threaded cylinder 704. A crossbar 708 is inserted into one side surface of the protruding cylinder 707. The crossbar 708 passes through the protruding cylinder 707 and is fixedly connected to the inner wall of the glue box 4. Multiple balls are uniformly and circumferentially engaged on the inner wall of the protruding cylinder 707. The balls are in contact with the outer wall of the crossbar 708. The balls can roll, but cannot be separated from the inner wall of the protruding cylinder 707, which can reduce the frictional resistance between the inner wall of the protruding cylinder 707 and the outer wall of the crossbar 708.

[0027] See attached document Figure 1-4 The glue control unit 8 includes an electric push rod 801, which is mounted above one side surface of the glue tank 4. The outer shell of the electric push rod 801 is fixedly connected to the contact surface of the glue tank 4. The working principle of the electric push rod 801 is that the electric motor is used as the power source. After one or two stages of gear reduction, the push rod drives the lead screw and nut pair. The rotational motion of the electric motor is converted into the linear motion of the push rod along the guide rail. By using the forward and reverse rotation of the electric motor, the reciprocating forward and backward motion of the push rod can be realized. A strip plate 802 is fixedly connected to the output end of the electric push rod 801. The lower surface of the strip plate 802 is fixedly connected to the top of the liquid level sensor 10. Multiple scrapers 803 are fixedly connected at equal intervals from front to back on the surface of the strip plate 802 away from the electric push rod 801.

[0028] The surface of the scraper 803 facing the drive roller 6 has an arc-shaped structure, and the arc-shaped structure has the same curvature as the outer wall of the drive roller 6. After the scraper 803 moves towards the drive roller 6, it can make full contact with the outer wall of the drive roller 6, which is convenient for effectively scraping off excess glue. The maximum movement of the electric push rod 801 is the same as the distance between the scraper 803 and the drive roller 6, which can prevent the contact and pressing force between the scraper 803 and the drive roller 6 from being too large, and prevent increasing the rotational workload of the drive roller 6.

[0029] Working principle:

[0030] Apply glue in measured quantities:

[0031] The user first inserts the cardboard 3 to be coated through the feed inlets on both sides of the housing 2, and then starts the transmission device on the back of the housing 2 to make the drive roller 6 and the transmission roller attached to the upper surface of the cardboard 3 rotate, which can achieve uniform movement of the cardboard 3. During the rotation of the drive roller 6, the glue 5 inside the glue tank 4 can be dipped and applied to the surface of the cardboard 3 to complete the coating operation on the surface of the cardboard 3.

[0032] During this period, the liquid level sensor 10 monitors the liquid level of the glue inside the glue tank 4. When the liquid level of the glue inside the glue tank 4 drops, it sends a signal to the module component of the electrical box 9, and then generates a control signal to the motor 706. The motor 706 starts to run, causing the lead screw 705 to rotate. The lead screw 705 will drive the threaded cylinder 704. Due to the threaded connection between the lead screw 705 and the threaded cylinder 704, and the sliding limit of the crossbar 708 on the convex cylinder 707, the two threaded cylinders 704 will move towards the center. Through the transmission of the inclined bar 703, the support plate 701 and the rubber sleeve 702 can move upward.

[0033] The upward movement of the pallet 701 and the rubber sleeve 702 will cause the lowest point of the glue 5 inside the glue tank 4 to move upward, replenishing the amount of glue 5 that has decreased, so that the liquid level of glue 5 inside the glue tank 4 will not be too low. That is, the amount of glue 5 dipped and applied by the active roller 6 per revolution is the same, thereby improving the uniformity of glue coating on the surface of the cardboard 5.

[0034] It is worth noting that during periods of non-use of the equipment in this application, the glue 5 inside the glue tank 4 must be completely used up. If the glue 5 is not used up, it must be covered with the lid that matches the glue tank 4 to prevent the glue 5 from curing and being wasted when it has not been used for a long time.

[0035] Reduce glue supply:

[0036] When the cardboard 3 to be coated with glue 5 requires a small amount of glue, the user can control the electric push rod 801 to make the strip plate 802 approach the scraper 803 in the direction of the drive roller 6 and contact the outer wall of the drive roller 6. This can scrape off the part of the outer wall of the drive roller 6 that is coated with glue 5, changing the original all-round glue application to multiple strip glue applications, which can save the amount of glue 5 used.

[0037] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A high-uniformity three-roller coating mechanism, comprising a base plate (1), characterized in that: A housing (2) is fixed to the upper surface of the base plate (1). A cardboard (3) is inserted into one side of the housing (2). The cardboard (3) penetrates the housing (2). A glue tank (4) is provided at the bottom inside the housing (2). Glue (5) is provided inside the glue tank (4). An active roller (6) is provided above the center inside the glue tank (4). The upper part of the outer wall of the active roller (6) is in contact with the contact surface of the cardboard (3). A liquid pushing unit (7) is provided below the inside of the glue tank (4). A glue control unit (8) is provided above one side of the glue tank (4). An electrical box (9) is fixed to the other side of the glue tank (4). A liquid level sensor (10) is provided on the upper side of the glue (5). The liquid level sensor (10) is connected to the glue control unit (8).

2. The high-uniformity three-roller coating mechanism according to claim 1, characterized in that: The liquid dispensing unit (7) includes a support plate (701), which is located inside the glue tank (4) at the bottom. A rubber sleeve (702) is fixedly fitted onto the outer wall of the support plate (701). The outer wall of the rubber sleeve (702) abuts against the inner wall of the glue tank (4). Diagonal rods (703) are hinged to both sides of the lower surface of the support plate (701). A threaded cylinder (704) is hinged to the other end of the diagonal rod (703). The inner wall of the threaded cylinder (704) is threaded with a lead screw (705). A motor (706) is fixedly connected to one end of the lead screw (705). The motor (706) is fixedly connected to the contact surface of the glue tank (4). A protruding cylinder (707) is fixedly connected to the bottom of the outer wall of the threaded cylinder (704). A crossbar (708) is inserted into one side surface of the protruding cylinder (707). The crossbar (708) passes through the protruding cylinder (707) and is fixedly connected to the inner wall of the glue tank (4).

3. The high-uniformity three-roller coating mechanism according to claim 2, characterized in that: The inner wall of the convex cylinder (707) is uniformly and annularly fitted with multiple balls, and the balls are in contact with the outer wall of the crossbar (708).

4. The high-uniformity three-roller coating mechanism according to claim 1, characterized in that: The glue control unit (8) includes an electric push rod (801), which is installed above one side surface of the glue tank (4). A strip plate (802) is fixedly connected to the output end of the electric push rod (801). The lower surface of the strip plate (802) is fixedly connected to the top of the liquid level sensor (10). Multiple scrapers (803) are fixedly connected at equal intervals from front to back on the surface of the strip plate (802) away from the electric push rod (801).

5. The high-uniformity three-roller coating mechanism according to claim 4, characterized in that: The surface of the scraper (803) facing the drive roller (6) has an arc-shaped structure, and the arc-shaped structure has the same curvature as the outer wall of the drive roller (6).

6. The high-uniformity three-roller coating mechanism according to claim 4, characterized in that: The maximum movement of the electric push rod (801) is the same as the distance between the scraper (803) and the drive roller (6).

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