A PU foam coating line thickness control mechanism

Abstract

The utility model belongs to the field of foam production equipment, and specifically relates to a PU foam coating line thickness control mechanism, including a coating conveyor, a scraper group, a lifting mechanism, a thickness detector, a sensor and a pair of fine-tuning mechanisms, the scraper group includes an upper roller scraper and a lower roller scraper, the lifting mechanism is fixed to the side of the coating conveyor, the actuator of the lifting mechanism is fixed to the upper roller scraper, the thickness detector is fixed on the coating conveyor and is located between the oven and the scraper group, the sensor is used to detect the gap value between the upper roller scraper and the lower roller scraper, the fine-tuning mechanism is used to fine-tune the height value of the upper roller scraper, and the signal output ends of the thickness detector and the sensor are connected to the signal input end of the driving mechanism of the fine-tuning mechanism. The utility model can ultimately ensure that the actual thickness value of the finished product is within the preset allowable tolerance range, thereby ensuring the quality of the bubble cotton.

Description

Technical Field

[0001] The utility model belongs to the field of foam production equipment, and in particular relates to a PU foam coating line thickness control mechanism. Background Art

[0002] Bubble cotton products are densely pore, low density, light weight, and have functions of cushioning protection, heat insulation, sound insulation, shockproof, etc. Polyurethane foam (PU foam) is one of the bubble cotton.

[0003] The production process of polyurethane foam is roughly as follows: first, the AB materials are stirred evenly through a high-speed mixer head to become PU materials, then the PU materials are coated on the release paper, and then the PU materials are covered with raw materials such as PET. After the three form a sandwich structure, the three pass between the upper roller scraper and the lower roller scraper, and their thickness is rolled and regulated by the scraper assembly, so that the thickness of the PU layer is controlled within the tolerance range allowed by the preset value, and then enter the oven for foaming and maturation, and finally the release paper is peeled off, and the release paper can be put back into use after being rolled up, while the PET layer and the foaming layer are rolled up together to become a product. The foaming rate of the PU layer, the thickness of the release paper and the PET layer are fixed. When the thickness of the PU layer is well controlled, the thickness value of the product can be controlled within the tolerance range of the preset value.

[0004] Although the scraper group can adjust the thickness of PU, in actual production, the thickness of the finished product is often far from the desired thickness. This is because the upper and lower roller scrapers will cause position errors when they are installed, and the size of the upper and lower roller scrapers themselves will also have errors. The accumulation of these two factors will cause a large deviation in the thickness of the product, which can easily cause the product to fail to meet customer expectations and require rework, resulting in a long delivery period and high costs. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the thickness value of the current PU foam finished product after production is often greatly deviated from the preset thickness value, resulting in failure to meet customer requirements and rework, leading to long delivery time and high cost.

[0006] In order to solve the above technical problems, the utility model provides a PU foam coating line thickness control mechanism, including a coating conveyor, a scraper group, a lifting mechanism, a thickness detector, a sensor and a pair of fine-tuning mechanisms, the scraper group includes an upper roller scraper and a lower roller scraper, the upper roller scraper is arranged above the coating conveyor, and the lower roller scraper is arranged below the coating conveyor platform.

[0007] The lifting mechanism is fixed on the side of the coating conveyor, the actuator of the lifting mechanism is fixed to the upper roller scraper, the thickness detector is fixed on the coating conveyor and is located between the oven and the scraper group, the detection part of the thickness detector faces the table of the coating conveyor, and two fine-adjustment mechanisms are respectively located on one side of the two ends of the upper roller scraper. The sensor is used to detect the gap value between the upper roller scraper and the lower roller scraper. The fine-adjustment mechanism is used to fine-adjust the height value of the upper roller scraper. The signal output ends of the thickness detector and the sensor are connected to the signal input end of the driving mechanism of the fine-adjustment mechanism.

[0008] Preferably, the fine-tuning mechanism includes a servo motor, a first support seat, a second support seat, a screw rod, a ball nut and a slope lifting block, the screw rod penetrates into the first support seat and the second support seat, and is rotatably connected to the first support seat and the second support seat, the ball nut is sleeved on the outside of the screw rod, the slope lifting block is a right-angled trapezoid with a vertical cross-section, one of the right-angled sides of the slope lifting block is fixed to the ball nut, the slope surface of the slope lifting block can contact the upper roller scraper, the slope surface of the slope lifting block gradually rises from the front side to the rear side, the servo motor is fixed on the first support seat or the second support seat, and one end of the screw rod is fixed to the output end of the servo motor.

[0009] Preferably, the lifting mechanism is a cylinder, and the free end of the telescopic rod of the cylinder is fixed to the upper roller scraper.

[0010] The technical solution of the utility model has the following beneficial effects:

[0011] The coating material of the utility model passes through the scraper assembly and then passes through the thickness detector, which detects the thickness of the coating material. When the thickness is detected to be unqualified, the fine-tuning mechanism is activated with the help of a sensor for measuring the gap value between the scraper groups, and the height value of the upper roller scraper is adjusted, thereby adjusting the gap value between the upper roller scraper and the lower roller scraper, ensuring that the actual thickness value of the subsequent coating material is within the preset allowable tolerance range, and finally ensuring that the actual thickness value of the finished product is within the preset allowable tolerance range. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1This is a schematic diagram of the utility model installed on a PU foam coating line;

[0014] Figure 2 It is the front view of the utility model;

[0015] Figure 3 It is a left view of the utility model.

[0016] Explanation of the accompanying drawings: 1. Coating conveyor; 2. Scraper group; 21. Upper roller scraper; 22. Lower roller scraper; 3. Lifting mechanism; 4. Thickness detector; 5. Sensor; 6. Fine-tuning mechanism; 61. Servo motor; 62. First support seat; 63. Second support seat; 64. Screw; 65. Ball nut; 66. Slope lifting block. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] The utility model provides a PU foam coating line thickness control mechanism, comprising a coating conveyor 1, a scraper group 2 and a lifting mechanism 3, a thickness detector 4, a sensor 5 and a pair of fine-tuning mechanisms 6. The scraper group 2 comprises an upper roller scraper 21 and a lower roller scraper 22. The upper roller scraper 21 is arranged above the coating conveyor 1, and the lower roller scraper 22 is arranged below the coating conveyor 1. The lifting mechanism 3 is fixed to the side of the coating conveyor 1, and the actuator of the lifting mechanism 3 is fixed to the upper roller scraper 21. The thickness detector 4 is fixed on the coating conveyor 1 and is located between the oven and the scraper group 2, and the detection part of the thickness detector 4 faces the table of the coating conveyor 1. Two fine-tuning mechanisms 6 are respectively located on one side of the two ends of the upper roller scraper 21. The sensor 5 is used to detect the gap value between the upper roller scraper 21 and the lower roller scraper 22. The fine-tuning mechanism 6 is used to fine-tune the height value of the upper roller scraper 21. The signal output ends of the thickness detector 4 and the sensor 5 are both connected to the signal input end of the driving mechanism of the fine-tuning mechanism 6 .

[0022] The basic working principle of the utility model is as follows: before starting production, the height position of the upper roller scraper 21 is lowered in advance by using the lifting mechanism 3, so that the gap between the upper roller scraper 21 and the lower roller scraper 22 is adjusted to correspond to the thickness value of the pre-produced product, and then the product production is started: the release paper part is first coated (coated with PU raw material), and then the release paper and the PU raw material are covered with PET raw material when they are about to reach the scraper group 2 to form a coating material. The coating material passes between the upper roller scraper 21 and the lower roller scraper 22, and the scraper group 2 controls the thickness of the coating material, theoretically ensuring that the PU thickness corresponds to the thickness of the foam produced.

[0023] However, due to the error in the installation position of the mechanical parts, the calculation and execution of the lifting mechanism 3 will have errors, so that the thickness of the coating material controlled by the scraper group 2 will have errors and the preset value. When the coating material passes through the thickness detector 4, the thickness detector 4 detects the thickness of the coating material. Once it is detected that the thickness deviation of the coating material exceeds the allowable tolerance range, a signal is sent to the fine-tuning mechanism 6, and the fine-tuning mechanism 6 is then started. According to the data detected by the sensor 5 and the actual thickness value detected by the thickness detector 4, the height value of the upper roller scraper 21 is adjusted to fine-tune the gap value between the upper roller scraper 21 and the lower roller scraper 22. When the actual thickness value of the coating material is too small, the fine-tuning mechanism 6 makes the upper roller scraper 21 rise slightly; when the actual thickness value of the coating material is too large, the fine-tuning mechanism 6 makes the upper roller scraper 21 drop slightly. The subsequent coating materials are all passed through the adjusted scraper group 2, and their thickness values ​​basically meet the standards.

[0024] The fine-tuning mechanism 6 of the utility model specifically includes a servo motor 61, a first support seat 62, a second support seat 63, a screw rod 64, a ball nut 65 and a slope lifting block 66. The screw rod 64 penetrates into the first support seat 62 and the second support seat 63, and is rotatably connected to the first support seat 62 and the second support seat 63. The ball nut 65 is sleeved on the outside of the screw rod 64. The slope lifting block 66 is a right-angled trapezoid with a vertical cross-section. One of the right-angled sides of the slope lifting block 66 is fixed to the ball nut 65. The slope surface of the slope lifting block 66 can contact the upper roller scraper 21. The slope surface of the slope lifting block 66 gradually rises from the front side to the rear side. The servo motor 61 is fixed on the first support seat 62 or the second support seat 63. One end of the screw rod 64 is fixed to the output end of the servo motor 61. When the servo motor 61 receives the signal from the thickness detector 4 and the sensor 5, the output shaft of the servo motor 61 rotates forward or reversely, causing the screw rod 64 to rotate forward or reversely, thereby causing the ball nut 65 to move forward or backward, and finally the slope lifting block 66 to move forward or backward. When the slope lifting block 66 moves forward, the upper roller scraper 21 is lifted; when the slope lifting block 66 moves backward, the upper roller scraper 21 is lowered. Specifically, when the detected coating material thickness is too small, the output shaft of the servo motor 61 rotates forward; when the detected coating material thickness is too large, the output shaft of the servo motor 61 rotates reversely.

[0025] Specifically, the lifting mechanism 3 of the utility model is a cylinder, and the free end of the telescopic rod of the cylinder is fixed to the upper roller scraper 21.

[0026] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A PU foam coating line thickness control mechanism, comprising a coating conveyor (1) and a scraper group (2), the scraper group (2) comprising an upper roller scraper (21) and a lower roller scraper (22), the upper roller scraper (21) being arranged above the coating conveyor (1), and the lower roller scraper (22) being arranged below the coating conveyor (1), characterized in that: The coating conveyor (1) further comprises a lifting mechanism (3), a thickness detector (4), a sensor (5) and a pair of fine-adjustment mechanisms (6). The lifting mechanism (3) is fixed to the side of the coating conveyor (1). The actuator of the lifting mechanism (3) is fixed to the upper roller scraper (21). The thickness detector (4) is fixed to the coating conveyor (1) and is located between the oven and the scraper group (2). The detection part of the thickness detector (4) faces the table of the coating conveyor (1). The two fine-adjustment mechanisms (6) are respectively located on one side of the two ends of the upper roller scraper (21). The sensor (5) is used to detect the gap value between the upper roller scraper (21) and the lower roller scraper (22). The fine-adjustment mechanism (6) is used to fine-adjust the height value of the upper roller scraper (21). The signal output ends of the thickness detector (4) and the sensor (5) are connected to the signal input end of the drive mechanism of the fine-adjustment mechanism (6).

2. A PU foam coating line thickness control mechanism according to claim 1, characterized in that: The fine-tuning mechanism (6) comprises a servo motor (61), a first support seat (62), a second support seat (63), a screw rod (64), a ball nut (65) and a slope lifting block (66), wherein the screw rod (64) penetrates into the first support seat (62) and the second support seat (63) and is rotatably connected to the first support seat (62) and the second support seat (63), the ball nut (65) is sleeved on the outside of the screw rod (64), and the slope lifting block (66) is The vertical cross section is a right-angled trapezoid, one of the right-angled sides of the slope lifting block (66) is fixed to the ball nut (65), the slope surface of the slope lifting block (66) can contact the upper roller scraper (21), the slope surface of the slope lifting block (66) gradually rises from the front side to the rear side, the servo motor (61) is fixed on the first support seat (62) or the second support seat (63), and one end of the screw rod (64) is fixed to the output end of the servo motor (61).

3. A PU foam coating line thickness control mechanism according to claim 1, characterized in that: The lifting mechanism (3) is a cylinder, and the free end of the telescopic rod of the cylinder is fixed to the upper roller scraper (21).

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