A twin roll coater

Abstract

The utility model discloses a double roll coater, including frame, coating roll and adjusting roller, and coating roll is located adjusting roller one side and is installed on the frame through fixed axle seat, the position of adjusting roller both ends on the frame corresponds and is horizontally fixed with translation slide rail, and the sliding connection of translation slide rail has wedge translation sliding block, and the adjusting roller of wedge translation sliding block is installed through one side fixed movable axle seat, and spring mechanism is arranged between fixed axle seat and movable axle seat. The utility model adjusts the ball screw only to be responsible for providing vertical driving force, and does not directly bear and transmit horizontal direction's adjusting force, and adjusting the ball screw passes through the rolling of ball between screw and screw nut to transmit movement, can realize very small idle stroke even zero backlash, and any slight movement in vertical direction will be immediately converted into horizontal direction's movement, does not leave the space of clearance to exist, and adjusting distance linearity, and the precision of micro motion improves greatly, realizes the effect that adjusting roller high accuracy adjusts.

Description

Technical Field

[0001] This utility model relates to the field of coating technology, specifically a two-roller coating machine. Background Technology

[0002] In a two-roll coater, the position of the coating roller is usually fixed, while the position of the adjusting roller is adjustable. During operation, it is often necessary to adjust the distance between the adjusting roller and the coating roller to control coating accuracy and adapt to different process requirements. In the prior art, many two-roll coaters use a worm gear and worm shaft combination or a screw and thread combination to adjust the position of the adjusting roller. For example, patent application number 202020577302.6 describes a relatively common two-roll coater that uses both a worm gear and worm shaft combination and a screw and thread combination to adjust the position of the adjusting roller.

[0003] The adjustment methods for worm and worm wheel fits, and screw and threaded joint fits, all involve backlash, often referred to as "free travel" or "backlash." This refers to the situation where, when the rotation direction of the driving worm and screw changes, the driven worm wheel and threaded joint do not immediately follow the driving part, but instead experience a period of ineffective, idle travel. The causes are multifaceted, but the core issue is the unavoidable clearance between the driving and driven parts. To ensure that the driving and driven parts can rotate relative to each other without jamming, a necessary fit clearance must be maintained during design and manufacturing; this is called the fit tolerance. This clearance is the physical basis for backlash. If a zero-clearance interference fit is made, rotation will be impossible, or wear will occur extremely quickly.

[0004] Since most existing twin-roll coating machines use worm gear and worm or screw and thread for adjustment, the presence of idle stroke results in non-linear adjustment distance of the adjusting roller and insufficient micro-motion accuracy. The adjustment accuracy of the adjusting roller of the twin-roll coating machine is the purpose and core of the adjustment. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a twin-roller coating machine for achieving high-precision adjustment of the adjusting roller.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A two-roller coating machine includes a frame, a coating roller, and an adjusting roller. The coating roller is located on one side of the adjusting roller and is mounted on the frame via a fixed shaft seat. A horizontal translation slide rail is fixed on the frame at positions corresponding to both ends of the adjusting roller. A wedge-shaped translation slider is slidably connected to the translation slide rail. The adjusting roller is mounted on the wedge-shaped translation slider via a movable shaft seat fixed on one side. A spring mechanism is provided between the fixed shaft seat and the movable shaft seat.

[0008] The wedge-shaped translation slider is slidably connected to the wedge-shaped extrusion slider on the side away from the coating roller. A fixing frame is fixed on the frame at the position corresponding to the wedge-shaped extrusion slider. A lifting slide rail is vertically fixed on the inner wall of the fixing frame on the side away from the coating roller. The wedge-shaped extrusion slider is slidably connected to the lifting slide rail.

[0009] The top of the wedge-shaped extrusion slider is rotatably connected to a vertical adjusting ball screw. The upper end of the adjusting ball screw passes through the fixed frame and is connected to the adjusting drive assembly. A screw nut that cooperates with the adjusting ball screw is fixedly installed on the fixed frame.

[0010] Preferably, both the translation slide rail and the lifting slide rail are T-shaped slide rails, the wedge-shaped translation slider further includes a translation slide base whose bottom is slidably connected to the translation slide rail, and the wedge-shaped compression slider further includes a lifting slide base slidably connected to the lifting slide rail.

[0011] Preferably, the movable shaft seat is fixed on the translation slide, and the adjusting ball screw is connected to the top of the lifting slide via a rotating connecting seat at its lower end.

[0012] Preferably, the spring mechanism includes a horizontally arranged return spring and limit seats sleeved on the two end surfaces of the return spring and respectively fixed to the opposite surfaces of the fixed shaft seat and the movable shaft seat.

[0013] Preferably, the movable shaft seat is connected to the roller shaft of the adjusting roller via a self-aligning bearing.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention utilizes an adjustable ball screw to move a wedge-shaped extrusion slider up and down, altering the lateral extrusion on a wedge-shaped translation slider. This, in turn, causes the adjusting roller to translate and change position via the wedge-shaped translation slider. The adjusting ball screw transmits motion through the rolling of balls between the screw and nut, achieving minimal backlash or even zero backlash. The adjusting ball screw only provides vertical driving force and does not directly bear or transmit horizontal adjustment force. The horizontal force, i.e., the force causing the adjustment roller gap, is transmitted and amplified by the mutual extrusion of the inclined surfaces of the wedge-shaped extrusion slider and the wedge-shaped translation slider. A spring mechanism ensures that the inclined surfaces of the wedge-shaped extrusion slider and the wedge-shaped translation slider remain tightly fitted, with no tendency to separate. Therefore, any minute vertical movement is immediately converted into horizontal movement, leaving no space for gaps. The adjustment distance is linear, and the micro-motion accuracy is significantly improved, thus achieving high-precision adjustment of the adjusting roller. Attached Figure Description

[0016] Figure 1 This is a front view of the corresponding positions of the coating roller and the adjusting roller of this utility model;

[0017] Figure 2 This is a front view of the wedge-shaped translation slider and the wedge-shaped extrusion slider of this utility model.

[0018] In the diagram: 1. Frame; 2. Coating roller; 3. Adjusting roller; 4. Fixed shaft seat; 5. Translation slide rail; 6. Wedge-shaped translation slider; 7. Movable shaft seat; 8. Spring mechanism; 9. Wedge-shaped extrusion slider; 10. Fixed frame; 11. Lifting slide rail; 12. Adjusting ball screw; 13. Screw nut; 14. Translation slide; 15. Lifting slide; 16. Rotary connecting seat; 17. Limit seat; 18. Return spring. Detailed Implementation

[0019] 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.

[0020] like Figure 1-2 As shown, this utility model provides a technical solution: a double-roller coating machine, including a frame 1, a coating roller 2 and an adjusting roller 3. The coating roller 2 is located on one side of the adjusting roller 3 and is mounted on the frame 1 through a fixed shaft seat 4. A horizontal translation slide rail 5 is fixed on the frame 1 at the positions corresponding to both ends of the adjusting roller 3. A wedge-shaped translation slider 6 is slidably connected on the translation slide rail 5.

[0021] The wedge-shaped translation slider 6 is equipped with the adjusting roller 3 via the movable shaft seat 7 fixed on one side. The movable shaft seat 7 is connected to the roller shaft of the adjusting roller 3 via the self-aligning bearing to adapt to different adjustment situations at both ends. The translation slide rail 5 and the lifting slide rail 11 are both T-shaped slide rails. The wedge-shaped translation slider 6 also includes a translation slide block 14 whose bottom is slidably connected to the translation slide rail 5. The movable shaft seat 7 is fixed on the translation slide block 14.

[0022] A spring mechanism 8 is provided between the fixed shaft seat 4 and the movable shaft seat 7. The spring mechanism 8 includes a horizontally arranged return straight spring 18 and a limiting seat 17 sleeved on the two end surfaces of the return straight spring 18 and respectively fixed to the opposite surfaces of the fixed shaft seat 4 and the movable shaft seat 7. The spring mechanism 8 ensures that the inclined surfaces of the wedge-shaped extrusion slider 9 and the wedge-shaped translation slider 6 are always tightly fitted and there is no tendency to separate.

[0023] A wedge-shaped translation slider 6 is slidably connected to a wedge-shaped extrusion slider 9 on the side away from the coating roller 2. The wedge-shaped extrusion slider 9 also includes a lifting slide 15 slidably connected to the lifting slide rail 11. A fixing frame 10 is fixed on the frame 1 at the position corresponding to the wedge-shaped extrusion slider 9. The lifting slide rail 11 is vertically fixed on the inner wall of the fixing frame 10 on the side away from the coating roller 2. The wedge-shaped extrusion slider 9 is slidably connected to the lifting slide rail 11.

[0024] The top of the wedge-shaped extrusion slider 9 is rotatably connected to a vertical adjusting ball screw 12. The adjusting ball screw 12 is connected to the top of the lifting slide 15 through a rotating connecting seat 16 rotatably connected at its lower end. The upper end of the adjusting ball screw 12 passes through the fixed frame 10 and is connected to the adjusting drive assembly. A screw nut 13 that cooperates with the adjusting ball screw 12 is fixedly installed on the fixed frame 10.

[0025] The adjusting ball screw 12 does not use direct friction transmission of the thread teeth, but transmits power by the rolling of the balls in the raceway between the screw and the screw nut 13. It can use preload technology to make the balls and the raceway in an interference fit state during manufacturing to eliminate clearance. Therefore, the balls can transmit force immediately regardless of whether it is rotating forward or backward, with almost no backlash.

[0026] The slope angles of the wedge-shaped extrusion slider 9 and the wedge-shaped translation slider 6 are usually designed to be smaller than the friction angle. This means that once the adjustment stops, the wedge-shaped extrusion slider 9 and the wedge-shaped translation slider 6 will self-lock due to friction and will not change their positions on their own due to the vibration or pressure of the adjustment roller 3.

[0027] The combination of adjusting the ball screw 12, the wedge-shaped extrusion slider 9, and the wedge-shaped translation slider 6 changes the way force is transmitted and constrained. The ball screw 12 rotates many times, and the wedge-shaped extrusion slider 9 only rises and falls a small distance. However, through the inclined plane, this small vertical displacement is converted into a smaller horizontal displacement of the wedge-shaped translation slider 6, achieving precise adjustment. The force transmission path is through the contact of the large-area metal inclined planes of the wedge-shaped extrusion slider 9 and the wedge-shaped translation slider 6, which has excellent rigidity.

[0028] Working principle:

[0029] The adjustment drive assembly drives the adjustment ball screw 12 to rotate, which in turn drives the wedge-shaped extrusion slider 9 to move up or down along the lifting slide rail 11 via the rotating connecting seat 16, changing the extrusion force with the wedge-shaped translation slide rail 5. Under the action of the extrusion force and the elastic force of the spring mechanism 8, the wedge-shaped translation slider 6 moves left or right along the translation slide rail 5, changing the distance between the adjustment roller 3 and the coating roller 2. The adjustment ball screw 12 is only responsible for providing vertical driving force and does not directly bear or transmit the horizontal adjustment force. The horizontal force, i.e. the force in the gap of the adjustment roller 3, is transmitted and amplified by the mutual extrusion of the inclined surfaces of the wedge-shaped extrusion slider 9 and the wedge-shaped translation slider 6, which enables high-precision adjustment of the adjustment roller 3.

[0030] In this solution, the adjustment drive component (not shown in the diagram) uses the same servo motor and reducer as existing technologies, and its working method and principle are also the same as those of existing dual-roller coating machines. Furthermore, all components in this solution are regularly inspected and maintained according to actual production conditions, and all vulnerable parts are replaced during maintenance based on wear and tear and usage time to ensure their normal operation.

[0031] It should be noted that, in this document, terms such as “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.

[0032] 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 two-roll coating machine, comprising a frame (1), a coating roller (2), and an adjusting roller (3), wherein the coating roller (2) is located on one side of the adjusting roller (3) and is mounted on the frame (1) via a fixed bearing (4), characterized in that: The frame (1) is horizontally fixed with translation slide rails (5) at both ends of the adjusting roller (3). A wedge-shaped translation slider (6) is slidably connected on the translation slide rail (5). The adjusting roller (3) is mounted on the wedge-shaped translation slider (6) through a movable shaft seat (7) fixed on one side. A spring mechanism (8) is provided between the fixed shaft seat (4) and the movable shaft seat (7). The wedge-shaped translation slider (6) is slidably connected to the wedge-shaped extrusion slider (9) on the side away from the coating roller (2). A fixing frame (10) is fixed on the frame (1) at the position corresponding to the wedge-shaped extrusion slider (9). A lifting slide rail (11) is vertically fixed on the inner wall of the fixing frame (10) on the side away from the coating roller (2). The wedge-shaped extrusion slider (9) is slidably connected to the lifting slide rail (11). The top of the wedge-shaped extrusion slider (9) is rotatably connected to a vertical adjusting ball screw (12). The upper end of the adjusting ball screw (12) passes through the fixed frame (10) and is connected to the adjusting drive assembly. A screw nut (13) that cooperates with the adjusting ball screw (12) is fixedly installed on the fixed frame (10).

2. The twin-roll coating machine according to claim 1, characterized in that: The translation slide rail (5) and the lifting slide rail (11) are both T-shaped slide rails. The wedge-shaped translation slider (6) also includes a translation slide seat (14) whose bottom is slidably connected to the translation slide rail (5). The wedge-shaped extrusion slider (9) also includes a lifting slide seat (15) slidably connected to the lifting slide rail (11).

3. A twin-roll coating machine according to claim 2, characterized in that: The movable shaft seat (7) is fixed on the translation slide (14), and the adjusting ball screw (12) is connected to the top of the lifting slide (15) through the rotating connecting seat (16) at the lower end.

4. A twin-roll coating machine according to claim 1, characterized in that: The spring mechanism (8) includes a horizontally arranged return spring (18) and a limiting seat (17) sleeved on both ends of the return spring (18) and fixed to the opposite sides of the fixed shaft seat (4) and the movable shaft seat (7), respectively.

5. A twin-roll coating machine according to claim 1, characterized in that: The movable bearing (7) is connected to the roller shaft of the adjusting roller (3) via a self-aligning bearing.

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