Mechanism for accurately adjusting gap between die lips by using stepping motor

Abstract

The utility model discloses a mechanism utilizing a stepping motor to accurately adjust a die lip gap, which comprises a control mechanism, a mounting seat, a bolt adjusting rod, an indexing dial, a stepping motor and a transmission mechanism, the bolt adjusting rod, the indexing dial, the stepping motor and the transmission mechanism are arranged on the mounting seat, the upper end of the bolt adjusting rod is fixed on the indexing dial, and the lower end of the bolt adjusting rod is connected with a die head gap bolt. The control mechanism controls the rotating speed and the rotating angle of the stepping motor, the stepping motor drives the bolt adjusting rod to rotate through the transmission mechanism, and the indexing dial is provided with a calibration adjusting part. According to the utility model, the stepping motor is connected with the worm and gear speed reducer, so that the screwing torque of the bolt can be controlled, the stepping motor can accurately control the number of rotation turns and the rotation angle, and after the reduction ratio of the worm and gear speed reducer, the rotation angle of the indexing dial at each time can be more accurately controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical manufacturing, and in particular relates to a mechanism for accurately adjusting a die lip gap by utilizing a stepping motor. Background Art

[0002] In the production of thermoplastic composites, polymers such as PP, PE, PA, and PET are heated in an extruder, melting them into a fluid. The rotating extruder screw propels the plastic forward, and a melt pump applies pressure, injecting the plastic into the die head at the flow rate set on the touchscreen. The molten plastic flows through the die head and is extruded at the die lip opening. The size of the die lip opening gap significantly affects the smoothness and output of the material. The gap between the upper and lower die lips is adjusted by a row of bolts, each adjusting a specific gap within the die lip. According to the Bernoulli principle in fluid dynamics, if the die lip opening gap is too large, the molten plastic at the die lip will overflow, easily causing sludge accumulation at the die head. If the die lip opening gap is too small, the material will be discharged in spots or even in the absence of material. To ensure uniform discharge, the pressure must be increased. However, increasing the pressure at the melt pump can cause the plastic to flow back, resulting in bubbling at the venting section. In daily production, adjusting the die lip gap by adjusting the bolts significantly impacts subsequent material surface defects and thickness. Therefore, properly adjusting the die lip gap is a crucial process. Using a standard hexagonal wrench to tighten the adjusting bolts is not sufficient for precise adjustment of the die lip gap, especially during fine-tuning. Die gap adjustment is difficult due to the following factors: 1. A hexagonal wrench cannot accurately adjust the die lip gap by adjusting the bolt angle; 2. The torque required to tighten each bolt must be the same, resulting in significant errors when manually adjusting the bolts. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a mechanism for accurately adjusting the die lip gap using a stepping motor, so as to solve the deficiencies in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present invention is realized by the following technical solutions:

[0005] A mechanism for precisely adjusting the die lip gap using a stepper motor is provided, comprising a control mechanism, a mounting seat, a bolt adjustment rod provided on the mounting seat, a graduated scale, a stepper motor, and a transmission mechanism. The upper end of the bolt adjustment rod is fixed to the graduated scale, and the lower end is connected to the die head gap bolt. The control mechanism controls the speed and rotation angle of the stepper motor. The stepper motor drives the bolt adjustment rod to rotate through the transmission mechanism. The graduated scale has a calibration adjustment part.

[0006] As described above, the mechanism for precisely adjusting the die lip gap using a stepping motor, wherein the transmission mechanism includes a coupling, a worm and a worm gear connected in sequence, and the worm gear is connected to the graduated scale.

[0007] As described above, the mechanism for precisely adjusting the die lip gap using a stepping motor, wherein the control mechanism is an electrically controlled touch screen.

[0008] As described above, the mechanism for precisely adjusting the die lip gap using a stepping motor, wherein the electronically controlled touch screen records the number of turns and angles of the plurality of die head gap bolts.

[0009] As described above, the mechanism for precisely adjusting the die lip gap using a stepping motor, wherein the calibration adjustment part is an adjustment hand wheel.

[0010] The beneficial effects of the technical solution of this utility model are:

[0011] Using a stepper motor connected to a worm gear reducer can control the torque of the bolt tightening. The stepper motor can accurately control the number of rotations and the rotation angle. After the reduction ratio of the worm gear reducer, the angle of each rotation of the indexing dial can be more accurately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] To further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0013] Figure 1 This is a front view of a preferred embodiment of the utility model;

[0014] Figure 2 for Figure 1 AA direction schematic diagram;

[0015] Figure 3 for Figure 1 Top view;

[0016] Figure 4 This is a schematic diagram of the preferred embodiment of the utility model in use;

[0017] In the figure: 1. Mounting base; 2. Bolt adjustment rod; 3. Indexing dial; 4. Stepper motor; 5. Die head clearance bolt; 6. Worm; 7. Worm gear; 8. Electronic control touch screen; 9. Adjustment hand wheel; 10. Die head body. DETAILED DESCRIPTION

[0018] The terms "utility model" and "the present invention" as used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered as limiting.

[0019] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0020] The use of "including," "having," and "comprising" and variations thereof herein is intended to encompass the items listed thereafter and equivalents thereof, as well as additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, and rear in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally define or limit the present invention in any manner. Furthermore, terms such as "first," "second," and "third" are used herein for descriptive purposes and are not intended to indicate or imply importance or significance.

[0021] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the utility model utilizes a stepper motor to accurately adjust the die lip gap mechanism, including a control mechanism, a mounting base 1 and a bolt adjustment rod 2, a graduated scale plate 3, a stepper motor 4 and a transmission mechanism. The upper end of the bolt adjustment rod 2 is fixed to the graduated scale plate 3, and the lower end is connected to the die head gap bolt 5. The control mechanism controls the speed and rotation angle of the stepper motor 4. The stepper motor 4 drives the bolt adjustment rod 2 to rotate through the transmission mechanism. The graduated scale plate 3 has a calibration adjustment part.

[0022] In a preferred embodiment, continue to refer to Figure 1 、 Figure 2 、 Figure 3 As shown, the transmission mechanism includes a coupling, a worm 6 and a worm wheel 7 connected in sequence. The worm wheel 7 is connected to the indexing scale 3. The worm 6 and the worm wheel 7 form a reducer. The control mechanism is an electric control touch screen 8, and the calibration part is an adjustment hand wheel 9.

[0023] Before adjusting the bolts, turn the adjustment handwheel 9 to align the 0 position of the indexing dial 3 with the arrow on the mounting base 1 to calibrate the zero position. Before starting adjustment, ensure that all bolts are at the same height. Use a flat plate to place the upper surface of the bolts to make them flush before adjustment so that all bolt adjustment parameters remain relatively consistent.

[0024] The bolt adjusting rod 2 is installed on the indexing dial 3. The stepping motor 4 is connected to the worm 6 with a coupling. The rotation of the worm 6 drives the worm wheel 7 to rotate. The worm wheel 7 is bolted to the indexing dial 3, which drives the indexing dial 3 to rotate. The rotation of the indexing dial 3 drives the bolt adjusting rod 2 to rotate. It is easy to understand that the rotation angle of the bolt adjusting rod 2 is the rotation angle of the die head gap bolt 5.

[0025] After knowing the speed ratio of the worm gear, the bolt angle control can be achieved after calculation. For example, the speed ratio of the worm gear is 1 to 50. The stepper motor 4 controls the worm 6 to rotate 50 circles, that is, the worm 6 drives the worm wheel 7 to rotate 1 circle. When the worm wheel 7 rotates one circle, the bolt adjusting rod 2 drives the bolt to rotate one circle.

[0026] The speed and rotation angle of stepper motor 4 are controlled via the touchscreen. For coarse adjustment, the stepper motor 4 rotates at a faster speed, and the touchscreen displays the number of revolutions of indexing dial 3 for each screw revolution. The touchscreen can also record the number of revolutions of each bolt. For fine adjustment of the bolts to control the die lip gap, the rotation angle of stepper motor 4 can be set to fine-tune the bolt rotation angle. The touchscreen can record the number of revolutions and angles of multiple bolts, enabling quantitative and comparative data on all bolt gap adjustments.

[0027] Continue to read Figure 4 As shown, the die head body 10 consists of two modules, upper and lower, connected by bolts. It contains a mold cavity, and the die lip serves as the discharge point. A row of bolts at the lip opening allows for adjustment of the gap between the upper and lower die lips. The gap between the lip openings can be adjusted by adjusting the bolts. The stepper motor 4 precisely controls the number of revolutions and angle of rotation. After adjusting the reduction ratio of the worm gear reducer, the angle of each rotation of the angle dial can be precisely controlled. The stepper motor 4 is the power source, and its speed and angle control are relatively precise, enabling better control of the rotation angle of the indexing dial 3.

[0028] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanism for accurately adjusting the die lip gap using a stepping motor, characterized in that: It includes a control mechanism, a mounting seat, a bolt adjustment rod, a graduated scale, a stepping motor and a transmission mechanism arranged on the mounting seat. The upper end of the bolt adjustment rod is fixed to the graduated scale, and the lower end is connected to the die head gap bolt. The control mechanism controls the rotation speed and rotation angle of the stepping motor. The stepping motor drives the bolt adjustment rod to rotate through the transmission mechanism. The graduated scale has a calibration adjustment part.

2. The mechanism for accurately adjusting the die lip gap using a stepping motor as claimed in claim 1, characterized in that: The transmission mechanism comprises a coupling, a worm and a worm wheel which are connected in sequence, and the worm wheel is connected to the graduated scale plate.

3. The mechanism for accurately adjusting the die lip gap using a stepping motor as claimed in claim 1, characterized in that: The control mechanism is an electrically controlled touch screen.

4. The mechanism for accurately adjusting the die lip gap using a stepping motor as claimed in claim 3, characterized in that: The electronically controlled touch screen records the number of turns and angles of the plurality of die head gap bolts.

5. The mechanism for accurately adjusting the die lip gap by using a stepping motor as claimed in claim 1, characterized in that: The calibration adjustment part is an adjustment hand wheel.

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