Three-roll mill for paint production

Abstract

The utility model relates to three roll mills technical field especially relates to a three roll mill for coating production, including the body, the body both sides symmetry installs three sets of bearing seat, all rotate and connect in three sets of bearing seat inside roll axle, rotate and connect distance adjusting screw on the body, and distance adjusting screw is connected with bearing seat threadedly, install the drive motor of driving distance adjusting screw rotation on the body, install laser range finder all on the body between three roll axles gap department, install thin film type thermocouple all in the installation cavity in three roll axles. The utility model discloses through laser range finder real time monitoring roll distance change, sends electric signal to drive motor department, drive motor positive rotation drives distance adjusting screw to rotate, and then pulls the bearing seat rear shift, drives slow rear roller or fast front roller to be far from the middle roller, to adjust the roll distance in real time to the surface temperature water cooling reduction after roll axle, and then push the bearing seat forward, reset initial roll distance, can realize dynamic roll distance adjustment, ensure product quality.

Description

Technical Field

[0001] This utility model relates to the field of three-roll mill technology, and in particular to a three-roll mill for coating production. Background Technology

[0002] In the coating production process, the three-roll mill, with its efficient grinding and dispersing performance, has become a key piece of equipment for refining pigments and uniformly mixing resins and additives.

[0003] Currently, most three-roll mills still use manual adjustment of the roller gap. This adjustment method relies on the operator's experience and feel, which has significant drawbacks: Firstly, the adjustment accuracy is low, with errors typically exceeding ±5μm, making it difficult to meet the stringent grinding fineness requirements of high-end coatings; secondly, the manual adjustment process is time-consuming, requiring repeated calibration each time, which cannot quickly respond to production demands, resulting in low production efficiency. Furthermore, after prolonged grinding, the rollers experience thermal expansion due to frictional heat. Existing equipment cannot monitor roller temperature and gap changes in real time, nor can it dynamically compensate for thermal expansion, causing the roller gap to gradually deviate from the set value during grinding. This ultimately leads to fluctuations in the fineness of the coating grinding, poor product quality stability, and an increased defect rate. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a three-roll mill for paint production, which solves the technical problems of existing technologies where manual adjustment of the roller gap requires repeated calibration, is prone to errors, and cannot dynamically compensate for the roller gap based on the thermal expansion of the roller shaft, thus affecting product quality.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a three-roll mill for paint production, comprising a machine body, three sets of bearing seats symmetrically installed on both sides of the machine body, each of the three sets of bearing seats having a roller shaft rotatably connected thereto, an adjusting screw being rotatably connected to the machine body and threadedly connected to the bearing seat, a drive motor for driving the adjusting screw to rotate being installed on the machine body, a laser rangefinder being installed at the gap between the three roller shafts on the machine body, a thin-film thermocouple being installed in the mounting cavity of each of the three roller shafts, and an alarm component for preventing the roller gap from being too narrow being provided between adjacent sets of bearing seats.

[0006] A further improvement is that the three rollers are a slow rear roller, a middle roller, and a fast front roller, respectively, wherein the bearing seats of the slow rear roller and the fast front roller are threaded with adjusting screws.

[0007] A further improvement is that a transparent protective shell is hinged to the machine body, and an infrared spectrometer is installed on the transparent protective shell at the top of the middle roller and the fast front roller.

[0008] A further improvement is that the alarm assembly includes mounting rods installed on adjacent bearing seats, a buffer spring installed between the adjacent bearing seats on the outside of the mounting rods, and electrical contacts installed at the outer ends of both mounting rods.

[0009] A further improvement is that baffles are installed between the three rollers and are attached to the rollers. The baffles are connected to the machine body by connecting rods. Spiral microgrooves are opened on the three rollers and ceramic coatings are sprayed on the three rollers.

[0010] A further improvement is that the spiral microgrooves on the three rollers are respectively a left-handed microgroove on the slow rear roller, a centripetal microgroove on the middle roller, and a right-handed microgroove on the fast front roller.

[0011] By employing the above technical solution, this utility model provides a three-roll mill for paint production, which has at least the following beneficial effects:

[0012] 1. This utility model uses a laser rangefinder to monitor the changes in roller gap in real time, sends an electrical signal to the drive motor, and the drive motor rotates forward to drive the adjustment screw to rotate, which in turn pulls the bearing seat to move backward, causing the slow rear roller or fast front roller to move away from the middle roller, thereby adjusting the roller gap in real time. When the surface temperature of the roller shaft is reduced by water cooling, the bearing seat is pushed forward to reset the initial roller gap, thus realizing dynamic adjustment of the roller gap and ensuring product quality.

[0013] 2. When the adjusting screw becomes worn and its accuracy is compromised, causing excessive adjustment of the bearing housing and resulting in an excessively narrow gap between adjacent rollers, the electrical contacts on the adjacent bearing housings will contact and generate an electrical signal to the main controller on the machine body, causing the three-roll grinding machine to stop and issue an alarm, reminding the staff to handle the situation in time and avoid damage from collisions between the rollers.

[0014] 3. This utility model improves the shearing efficiency of the coating by opening spiral microgrooves of different shapes on the roller shaft, thereby increasing friction, shortening the grinding time, improving grinding efficiency, and avoiding the phenomenon of slippage of high viscosity coatings. It also ensures precise control and uniform dispersion of coating particle size and improves product quality. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0016] In the attached diagram:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2This is a schematic diagram of the rear view structure of this utility model;

[0019] Figure 3 This is a top-down structural diagram of the present invention after the transparent protective shell has been removed;

[0020] Figure 4 This is a top-down structural diagram of the present invention after the body cover has been removed;

[0021] Figure 5 This utility model Figure 4 Enlarged structural diagram at point A in the middle;

[0022] Figure 6 This utility model Figure 4 Enlarged structural diagram at point B;

[0023] Figure 7 This is a partial cross-sectional view of the split structure of the roller in this utility model.

[0024] In the diagram: 1. Body; 2. Bearing housing;

[0025] 3. Roller shaft; 31. Slow-speed rear roller; 32. Middle roller; 33. Fast-speed front roller;

[0026] 4. Adjustable lead screw; 5. Drive motor; 6. Laser rangefinder; 7. Thin-film thermocouple;

[0027] 8. Alarm assembly; 81. Mounting rod; 82. Buffer spring; 83. Electrical contact;

[0028] 9. Transparent protective shell; 10. Infrared spectrometer; 11. Baffle plate; 12. Spiral microgroove. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] Currently available technologies require repeated calibration for manual roller spacing adjustment, which is prone to errors and cannot dynamically compensate for roller spacing changes based on roller thermal expansion, thus affecting product quality. This embodiment provides a three-roll mill for paint production that can dynamically adjust the roller spacing according to changes in roller spacing during grinding, thereby improving grinding efficiency and quality. Please refer to... Figures 1-7The three-roll mill for paint production includes a body 1, three sets of bearing seats 2 symmetrically mounted on both sides of the body 1, and rollers 3 rotatably connected to each of the three sets of bearing seats 2. An adjusting screw 4 is rotatably connected to the body 1 and threadedly connected to the bearing seat 2. A drive motor 5 is mounted on the body 1 to drive the adjusting screw 4 to rotate. A laser rangefinder 6 is installed on the body 1 at the gap between the three rollers 3. A thin-film thermocouple 7 is installed in the mounting cavity of each of the three rollers 3. An alarm component 8 is provided between adjacent sets of bearing seats 2 to prevent the roller gap from being too narrow.

[0032] The three rollers 3 are a slow rear roller 31, a middle roller 32, and a fast front roller 33. Both the slow rear roller 31 and the fast front roller 33 have threaded adjustment screws 4 connected to their bearing seats 2. During the grinding of the coating, the temperature of the rollers 3 is monitored in real time by a thin-film thermocouple 7. Based on the temperature changes of the rollers 3, the water cooling efficiency is adjusted to maintain the surface temperature of the rollers 3, preventing excessive heat and thermal expansion that could lead to changes in the gap. However, if the temperature of the rollers 3 rises abnormally in a short period, causing thermal expansion and narrowing of the gap, a laser rangefinder 6 will monitor the situation in real time. When the roller gap changes, an electrical signal is sent to the drive motor 5. The drive motor 5 rotates forward, causing the adjusting screw 4 to rotate, which in turn pulls the bearing seat 2 backward, causing the slow rear roller 31 or the fast front roller 33 to move away from the middle roller 32. This allows for real-time adjustment of the roller gap. When the surface temperature of the roller shaft 3 decreases due to water cooling, the laser rangefinder 6 starts the drive motor 5 to rotate in reverse according to the roller gap. This pushes the bearing seat 2 forward, causing the slow rear roller 31 or the fast front roller 33 to move closer to the middle roller 32, resetting the initial roller gap. The coating grinding process then continues, thus achieving dynamic adjustment of the roller gap and ensuring product quality.

[0033] During the grinding process, excessive feed rate of the coating or wear of the roller 3 can cause changes in the particle size of the coating. Therefore, a transparent protective shell 9 is hinged to the machine body 1 in this device. An infrared spectrometer 10 is installed on the transparent protective shell 9, located on the top of the middle roller 32 and the fast front roller 33. The transparent protective shell 9 prevents foreign objects from falling into the roller 3 and causing damage to the roller 3. The infrared spectrometer 10 analyzes the changes in coating particle size in real time. When the particle size exceeds the tolerance, the roller gap is automatically adjusted. There is no need for the staff to manually measure the coating particle size and then adjust the roller gap according to the particle size, which improves production efficiency and stabilizes coating quality.

[0034] When the distance between the rollers 3 is adjusted too narrowly and approaches the limit value, in order to avoid the rollers 3 colliding with each other and causing damage to the machine, the device is also equipped with an alarm component 8. The alarm component 8 includes a mounting rod 81 installed on the adjacent bearing seats 2. A buffer spring 82 is installed between the adjacent bearing seats 2 on the outside of the mounting rod 81. Electrical contacts 83 are installed at the outer ends of both mounting rods 81. When the adjusting screw 4 is worn and causes an error in accuracy, and the bearing seats 2 are over-adjusted, resulting in the roller distance between the adjacent rollers 3 being too narrow, the electrical contacts 83 on the adjacent bearing seats 2 will contact and generate an electrical signal to the main controller on the machine body 1, causing the three-roll grinding machine to stop and issue an alarm, reminding the staff to deal with it in time and avoid damage from collision between the rollers 3.

[0035] Example 2

[0036] Because traditional smooth rollers 3 are prone to slippage when grinding high-viscosity coatings, resulting in uneven particle size and affecting the stability of finished product quality, therefore, based on Example 1, as follows... Figures 1-7 As shown, in this device, baffle plates 11 are installed between the three rollers 3 and are attached to the rollers 3. The baffle plates 11 are inserted into the machine body 1 through connecting rods. Spiral microgrooves 12 are opened on the three rollers 3 and ceramic coating is sprayed on the three rollers 3.

[0037] The spiral microgrooves 12 on the three rollers 3 are respectively a left-handed microgroove on the slow rear roller 31, a bidirectional centripetal microgroove on the middle roller 32, and a right-handed microgroove on the fast front roller 33. As the rollers 3 roll, they grind the coating. The coating is conveyed to the center through the left-handed microgroove on the slow rear roller 31. During this process, the edge of the left-handed microgroove forms an initial shearing surface with the roller surface of the middle roller 32, which initially crushes large particles. When the material is conveyed to its central area through the bidirectional centripetal microgroove on the middle roller 32, it is repeatedly squeezed and sheared, and the particle size is rapidly reduced. The edge of the right-handed spiral groove on the fast front roller 33 forms a final shearing surface with the roller surface of the middle roller 32, which finally crushes the remaining particles. The three work together to form a three-dimensional crushing force field, which achieves precise control and uniform dispersion of coating particle size, shortens grinding time, and improves grinding efficiency. The ceramic coating reduces coating adhesion.

[0038] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-roll mill for paint production, comprising a machine body (1), characterized in that: Three sets of bearing seats (2) are symmetrically installed on both sides of the machine body (1). Roller shafts (3) are rotatably connected in each of the three sets of bearing seats (2). Adjustment screws (4) are rotatably connected on the machine body (1), and the adjustment screws (4) are threadedly connected to the bearing seats (2). A drive motor (5) for driving the adjustment screws (4) to rotate is installed on the machine body (1). Laser rangefinders (6) are installed in the gaps between the three roller shafts (3) on the machine body (1). Thin-film thermocouples (7) are installed in the mounting cavities of the three roller shafts (3). An alarm component (8) to prevent the roller gap from being too narrow is set between two adjacent sets of bearing seats (2).

2. A three-roll mill for paint production according to claim 1, characterized in that: The three rollers (3) are a slow rear roller (31), a middle roller (32) and a fast front roller (33), respectively. The bearing seats (2) of the slow rear roller (31) and the fast front roller (33) are threaded with adjusting screws (4).

3. A three-roll mill for paint production according to claim 2, characterized in that: A transparent protective shell (9) is hinged to the machine body (1), and an infrared spectrometer (10) is installed on the transparent protective shell (9) at the top of the middle roller (32) and the fast front roller (33).

4. A three-roll mill for paint production according to claim 1, characterized in that: The alarm assembly (8) includes a mounting rod (81) mounted on an adjacent bearing seat (2), a buffer spring (82) located outside the mounting rod (81) between the adjacent bearing seats (2), and an electrical contact (83) mounted on the outer end of each of the two mounting rods (81).

5. A three-roll mill for paint production according to claim 1, characterized in that: Each of the three rollers (3) is fitted with a baffle plate (11), and the baffle plate (11) is connected to the machine body (1) by a connecting rod. Each of the three rollers (3) has a spiral micro-groove (12) and is coated with a ceramic coating.

6. A three-roll mill for paint production according to claim 5, characterized in that: The spiral microgrooves (12) on the three rollers (3) are respectively a left-handed microgroove on the slow rear roller (31), a centripetal microgroove on the middle roller (32), and a right-handed microgroove on the fast front roller (33).

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