Prepreg pultrusion die precision adjustment mechanism

Abstract

This utility model discloses a precision adjustment mechanism for a prepreg pultrusion die, belonging to the field of prepreg processing technology. It includes at least one reference plate and an adjustment assembly located on the reference plate. The reference plate is arranged parallel to the width direction of the pultrusion die. Both ends of the reference plate have bosses, which fix the plate to the top of the upper mold plate or the bottom of the lower mold plate of the pultrusion die. The reference plate has multiple through holes along its length. The adjustment assembly includes an adjustment screw, an upper adjustment nut, and a lower adjustment nut. The adjustment screw passes through the through holes and is fixedly connected to the pultrusion die. The upper adjustment nut is threaded onto the adjustment screw above the reference plate and abuts against the top of the reference plate. The lower adjustment nut is threaded onto the adjustment screw below the reference plate and abuts against the bottom of the reference plate. This utility model improves the uniformity of the gap at the die exit, meets the dimensional requirements of the prepreg, and reduces the product defect rate.

Description

Technical Field

[0001] This utility model relates to the field of prepreg processing technology, and in particular to a precision adjustment mechanism for prepreg pultrusion dies. Background Technology

[0002] In the pultrusion process, the prepreg is drawn through a pultrusion die, heated and extruded to form a prepreg tape product of a specified thickness.

[0003] Existing pultrusion dies employ an openable die structure consisting of an upper and lower die. Heating tubes are arranged within both the upper and lower die to achieve the required high temperature of approximately 300℃-500℃ during molding. However, the carbon steel material used for the die can deform during high-temperature use, resulting in uneven distribution of the gap between the upper and lower die along the width direction. This leads to uneven thickness of the prepreg tape pulled out from the pultrusion die exit, resulting in a high product defect rate. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a precision adjustment mechanism for prepreg pultrusion dies, which improves the uniformity of the gap at the die exit, meets the dimensional requirements of the prepreg tape, and reduces the product defect rate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A precision adjustment mechanism for a prepreg pultrusion die, located on the exit side of the pultrusion die, includes at least one reference plate and an adjustment assembly on the reference plate. The reference plate is arranged parallel to the width direction of the pultrusion die. Both ends of the reference plate have bosses, which fix the plate to the top of the upper template or the bottom of the lower template of the pultrusion die. The reference plate has multiple through holes along its length. The adjustment assembly includes an adjustment screw, an upper adjustment nut, and a lower adjustment nut. The adjustment screw passes through the through holes and is fixedly connected to the pultrusion die. The upper adjustment nut is threaded onto the adjustment screw above the reference plate and abuts against the top of the reference plate. The lower adjustment nut is threaded onto the adjustment screw below the reference plate and abuts against the bottom of the reference plate. By setting a reference plate on at least one template side of the pultrusion die, and using the reference plate as a reference, the height of the template area corresponding to each position is finely adjusted by cooperating the adjustment screw and adjustment nut at each through hole position. This ensures the uniformity of the gap between the upper and lower templates, achieving the dimensional requirements of the prepreg and reducing the product defect rate.

[0006] The reference plate is made of alloy steel. Compared to the carbon steel used in the template, alloy steel has higher rigidity and strength, which can prevent the reference plate from deforming at operating temperatures.

[0007] The thickness of the reference plate is 1.2-1.5 times the thickness of the upper or lower template. Increasing the thickness of the reference plate enhances rigidity and strength.

[0008] The center-to-center distance between two adjacent through holes shall not exceed 80 mm.

[0009] The adjusting screw is a fine-pitch screw. Fine-pitch screws can improve the accuracy of size adjustment.

[0010] The upper template has a threaded groove at its top or the lower template has a threaded groove at its bottom, and the end of the adjusting screw is connected to the threaded groove.

[0011] A fastening nut is provided on the outside of the threaded groove. The fastening nut is threadedly connected to the adjusting screw and abuts against the top of the upper template or the bottom of the lower template.

[0012] There are two reference plates, one of which is fixed to the top of the upper template and the other is fixed to the bottom of the lower template.

[0013] This utility model has the following beneficial effects: This invention involves setting a reference plate on the outside of at least one template of a pultrusion die. Using this reference plate as a benchmark, the height of the template area corresponding to each position is finely adjusted by cooperating the adjusting screws and corresponding adjusting nuts at each through hole position. This ensures the uniformity of the gap between the upper and lower templates, thereby meeting the dimensional requirements of the prepreg and reducing the product defect rate. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the reference plate in this utility model, which is a single application on a pultrusion die; Figure 2 This is a schematic diagram of the structure of two reference plates used on a pultrusion die in this utility model; Figure 3 This is a schematic diagram showing the connection between the reference plate and the lower template in this utility model; Figure 4 This is a schematic diagram of the structure of this utility model; Figure 5 This is a cross-sectional view of the present invention along the line connecting the centers of the fixing bolts on both sides of the reference plate.

[0016] 1. Pultrusion die; 101. Upper die plate; 102. Lower die plate; 103. First frame; 104. Second frame; 105. Lifting cylinder; 2. Base plate; 201. Boss seat; 3. Adjustment assembly; 301. Adjusting screw; 302. Lower adjusting nut; 303. Upper adjusting nut; 304. Fastening nut; 4. Fixing bolt. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] like Figure 1As shown, the pultrusion die 1 in this solution is the same as that in the prior art. It includes an upper die 101 and a lower die 102, as well as a first frame 103 fixed on both sides of the upper die 101 and a second frame 104 fixed on both sides of the lower die 102. Heating tubes are embedded in both the upper die 101 and the lower die 102. A lifting cylinder 105 is provided between the first frame 103 and the corresponding second frame 104. The motor base of the lifting cylinder 105 is fixed on the second frame 104, and the output shaft of the lifting cylinder 105 is fixed on the first frame 103. Through the synchronous movement of each lifting cylinder 105, the upper die 101 is driven to open and close relative to the lower die 102. Of course, in other embodiments, the opening and closing movement between the upper die 101 and the lower die 102 can also be achieved in other ways.

[0022] like Figure 1 and Figure 3 As shown, this utility model provides a precision adjustment mechanism for a prepreg pultrusion die, located on the exit side of the pultrusion die 1. It includes at least one reference plate 2 and an adjustment assembly 3 located on the reference plate 2. The reference plate 2 is arranged parallel to the width direction of the pultrusion die 1. Both ends of the reference plate 2 are provided with boss seats 201, which are fixed to the top of the upper template 101 or the bottom of the lower template 102 of the pultrusion die 1. Specifically, in this embodiment, the reference plate 2 is installed at the bottom of the lower template 102. The specific installation method is as follows: a countersunk hole is opened vertically on the boss seat 201, and an internal thread is opened at the corresponding position on the lower template 102. A fixing bolt 4 passes through the countersunk hole and engages with the internal thread to complete the fixing of the boss seat 201 on the lower template 102. The reference plate 2 has multiple through holes along its length direction, such as… Figure 4 and Figure 5 As shown, the adjusting assembly 3 includes an adjusting screw 301, an upper adjusting nut 303, and a lower adjusting nut 302. The adjusting screw 301 passes through the through hole and is fixedly connected to the lower template 102. The upper adjusting nut 303 is threadedly connected to the adjusting screw 301 above the reference plate 2 and abuts against the top of the reference plate 2. The lower adjusting nut 302 is threadedly connected to the adjusting screw 301 below the reference plate 2 and abuts against the bottom of the reference plate 2. By setting a reference plate 2 on the outside of at least one template of the pultrusion die 1, and using this reference plate 2 as a reference, the height of the template area corresponding to each position is finely adjusted by cooperating the adjusting screw 301 and the adjusting nut at each through hole position. This ensures the uniformity of the gap between the upper template 101 and the lower template 102, thereby meeting the dimensional requirements of the prepreg and reducing the product defect rate.

[0023] Preferably, the reference plate 2 is made of alloy steel. Alloy steel is made by adding alloying elements such as chromium and nickel to carbon steel. Compared with the carbon steel of the template, it has higher rigidity and strength, which can effectively prevent the reference plate 2 from deforming at the working temperature, thus ensuring its reference function.

[0024] In a further preferred embodiment, in order to ensure that the rigidity of the reference plate 2 is higher than that of the corresponding template, the thickness of the reference plate 2 is 1.2-1.5 times the thickness of the lower template 102. In this embodiment, the thickness of the lower template 102 is usually 30mm, and the corresponding reference plate 2 has a thickness of 36mm-45mm, preferably 45mm.

[0025] It should be further noted that the center distance between two adjacent through holes is no more than 80mm, and the number of through holes is positively correlated with the width of the lower mold 102. In the pultrusion mold 1 with a prepreg forming specification of 300mm, the width of the lower mold is usually 500mm, the number of through holes is 5, and the center distance between them is 80mm.

[0026] In a further preferred embodiment, the adjusting screw 301 is of specification M12. In order to improve the accuracy of size adjustment, the adjusting screw 301 adopts a fine-pitch screw, specifically a fine-pitch screw with a pitch of 1mm.

[0027] To achieve non-welding fixation between the adjusting screw 301 and the lower template 102, the bottom of the lower template 102 is provided with a threaded groove, and the upper end of the adjusting screw 301 is connected to the threaded groove. More preferably, a fastening nut 304 is provided on the outside of the threaded groove. The fastening nut 304 is threadedly connected to the adjusting screw 301 and abuts against the top of the upper template 101 or the bottom of the lower template 102, further tightening the connection between the adjusting screw and the lower template 102.

[0028] The following describes the usage of this precision adjustment mechanism. After the heating tube of the pultrusion die 1 heats up to the working temperature, the upper die 101 and the lower die 102 are deformed by the high temperature. At this time, a feeler gauge (gap gauge) is used to gradually measure the gap between the upper die 101 and the lower die 102 along the width direction. The measured value is selected within the molding width range of the prepreg tape (e.g., 0.4 ± 0.05 mm). If the measured value is less than the above width range, the upper adjusting nut 303 on the adjusting screw 301 at the corresponding position is loosened, and the lower adjusting nut 302 is gradually tightened to drive the adjusting screw 301 to pull down the area of ​​the lower die 102 at that position, thereby increasing the gap between the lower die 102 and the upper die 102 at the corresponding position. The gap between the two templates is adjusted to the required width range. If the measured value is greater than the above width range, loosen the lower adjusting nut 302 on the adjusting screw 301 at the corresponding position and gradually tighten the upper adjusting nut 303 to drive the adjusting screw 301 to push the lower template 102 area at that position, reducing the gap between the lower template 102 and the upper template 101 at the corresponding position to the required width range. Of course, it is worth noting that the reference plate 2 can be fixed on the top of the upper template 101, and the usage method can be adjusted accordingly. The prepreg produced by the adjustment mechanism using a single reference plate 2 has a uniform thickness, and its cross-section may have a bending phenomenon, but it meets the quality requirements of prepreg. If it is necessary to further improve the quality of the prepreg, Figure 2 As shown, two reference plates 2 are selected. One is fixed on the top of the upper template 101 and is called the upper reference plate 2. The other is fixed on the bottom of the lower template 102 and is called the lower reference plate 2. In use, the upper reference plate 2 and the lower reference plate 2 are used as reference parts to make the gap between the upper template 101 and the lower template 102 form a horizontal gap, so that the prepreg tape produced is flatter.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A precision adjustment mechanism for a prepreg pultrusion die, located on the exit side of the pultrusion die, characterised in that, The device includes at least one reference plate and an adjustment assembly located on the reference plate. The reference plate is arranged parallel to the width direction of the pultrusion die. Both ends of the reference plate are provided with boss seats, which are fixed to the top of the upper template or the bottom of the lower template of the pultrusion die. The reference plate has multiple through holes along its length. The adjustment assembly includes an adjustment screw, an upper adjustment nut, and a lower adjustment nut. The adjustment screw passes through the through holes and is fixedly connected to the pultrusion die. The upper adjustment nut is threadedly connected to the adjustment screw above the reference plate and abuts against the top of the reference plate. The lower adjustment nut is threadedly connected to the adjustment screw below the reference plate and abuts against the bottom of the reference plate.

2. The prepreg pultrusion die precision adjustment mechanism of claim 1, wherein, The reference plate is made of alloy steel.

3. The prepreg pultrusion die precision adjustment mechanism of claim 2, wherein, The thickness of the reference plate is 1.2-1.5 times the thickness of the upper template or the lower template.

4. A prepreg pultrusion die precision adjustment mechanism according to any one of claims 1 to 3, characterised in that, The center-to-center distance between two adjacent through holes shall not exceed 80 mm.

5. The prepreg pultrusion die precision adjustment mechanism according to any one of claims 1-3, wherein, The adjusting screw is a fine-pitch screw.

6. The prepreg pultrusion die precision adjustment mechanism of claim 1, wherein, The upper template has a threaded groove at its top or the lower template has a threaded groove at its bottom, and the end of the adjusting screw is connected to the threaded groove.

7. The prepreg pultrusion die precision adjustment mechanism of claim 6, wherein, A fastening nut is provided on the outside of the threaded groove. The fastening nut is threadedly connected to the adjusting screw and abuts against the top of the upper template or the bottom of the lower template.

8. The prepreg pultrusion die precision adjustment mechanism of claim 1 or 6 or 7, wherein, There are two reference plates, one of which is fixed to the top of the upper template and the other is fixed to the bottom of the lower template.

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