Dual mold pultrusion device

Abstract

The utility model discloses a kind of pultrusion devices of double mould, including mould and limiting mechanism, at least two sets of mould are fixed on same mesa and are spaced a certain distance, the limiting mechanism includes pressing rod, elastic compensation part, the pressing rod is above two the mould, the elastic compensation part is between the pressing rod and the mould, the elastic compensation part includes connecting rod and first spring, the top of the connecting rod is connected with the pressing rod, the first spring is sleeved in the connecting rod outside, the first end of the first spring is connected with the connecting rod or the pressing rod, the second end of the first spring is abutted with the mould. The pultrusion device of double mould provided by the utility model has the advantage that the mould is fixed well.

Description

Technical Field

[0001] This utility model relates to the field of mold auxiliary equipment technology, and in particular to a pultrusion device with dual molds. Background Technology

[0002] The pultrusion process is a crucial step in molding and curing resin-impregnated reinforcing materials through a die. However, the resin curing process during pultrusion involves volume shrinkage, leading to instantaneous and irregular changes in the internal pressure of the die. Traditional die locking methods use rigid bolt connections, which cannot effectively buffer and absorb these instantaneous pressure fluctuations. When the internal pressure rises suddenly, it can easily cause defects such as surface cracks and internal porosity in the product. Conversely, when the internal pressure drops suddenly, gaps may appear between the die and the reinforcing material, causing dimensional deviations in the product and, in severe cases, even die chipping, shortening the die's lifespan. Currently, pultrusion equipment in the industry typically has only one die per table. This single-die layout results in extremely low table space utilization, especially when producing small-section, short-length pultruded products. The equipment's capacity is severely mismatched with space resources, leading to low production efficiency and increased unit production costs. Furthermore, the single-die layout also carries the risk of equipment idleness. When a single die malfunctions or needs replacement, the entire pultrusion production line must be shut down, further reducing production continuity and stability. Utility Model Content This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a dual-die pultrusion device, which has the advantage of good die fixing effect.

[0003] The dual-mold pultrusion device according to an embodiment of the present invention includes molds and a limiting mechanism. At least two sets of molds are fixed on the same platform and spaced a certain distance apart. The limiting mechanism includes a pressure rod and an elastic compensation member. The pressure rod is located above the two molds, and the elastic compensation member is located between the pressure rod and the molds. The elastic compensation member includes a connecting rod and a first spring. The top of the connecting rod is connected to the pressure rod, and the first spring is sleeved on the outside of the connecting rod. The first end of the first spring is connected to the connecting rod or the pressure rod, and the second end of the first spring abuts against the mold.

[0004] The dual-die pultrusion device according to the embodiments of this utility model has the advantage of good die fixing effect. This application has the following advantages: by pressing two or more dies with pressure bars, the fluctuation changes of the dies caused by internal pressure can be reduced, ensuring the stability of the product during the pultrusion process. At the same time, arranging multiple dies on the same table improves production efficiency, and the dies do not affect each other.

[0005] In some embodiments, the connecting rod is a stepped shaft having an upper section and a lower section, the diameter of the upper section of the stepped shaft being larger than the diameter of the lower section, the first spring being sleeved on the lower section of the stepped shaft, and the upper section being connected to the pressure rod by bolts.

[0006] In some embodiments, a second spring is further included, which is disposed on the upper section of the stepped shaft and fixedly connected to the upper section of the stepped shaft, and is sleeved on the outside of the first spring.

[0007] In some embodiments, the pressure bar extends perpendicular to the extension direction of the mold, and the length of the pressure bar is greater than the sum of the widths of the molds on the table.

[0008] In some embodiments, an adjusting member is further included, which is arranged on the connecting rod of the elastic compensator to control the initial pressure of the elastic compensator. The adjusting member includes a limiting ring and a locking bolt. The limiting ring is sleeved on the connecting rod and connected to a first end of the first spring. The locking bolt passes through the limiting ring and abuts against the connecting rod.

[0009] In some embodiments, a pressure sensor is also included, which is disposed at the connection between the pressure rod and the elastic compensator to detect the pressing pressure.

[0010] In some embodiments, a heat dissipation channel is formed between any two adjacent sets of molds, and heat dissipation pipes are arranged in the heat dissipation channel to increase heat dissipation. The heat dissipation pipes extend along the length of the mold and are connected to a cold source.

[0011] In some embodiments, a heat-conducting oil channel is provided inside the heat-conducting beam, the second end of the first spring is connected to the heat-conducting beam, and the bottom of the heat-conducting beam abuts against the top of the mold.

[0012] In some embodiments, the heat transfer oil channel is a spirally wound channel, and the inlet and outlet of the heat transfer oil channel are connected to the oil tank through pipelines.

[0013] In some embodiments, a buffer layer is provided at the bottom of the thermal beam to prevent the thermal beam from rigidly contacting the top of the mold. Attached Figure Description

[0014] Figure 1 This is a top view schematic diagram of the pultrusion device with dual molds according to an embodiment of the present utility model.

[0015] Figure 2 This is a structural schematic diagram of the pultrusion device with dual molds according to an embodiment of the present utility model.

[0016] Reference numerals: 1. Mold; 2. Pressure rod; 3. Connecting rod; 4. First spring; 5. Second spring; 6. Heat dissipation pipe. Detailed Implementation

[0017] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] The pultrusion device with two molds 1 according to an embodiment of the present invention includes molds 1 and a limiting mechanism. At least two sets of molds 1 are fixed on the same table and spaced a certain distance apart. The limiting mechanism includes a pressure rod 2 and an elastic compensation component. The pressure rod 2 is located above the two sets of molds 1, and the elastic compensation component is located between the pressure rod 2 and the molds 1. The elastic compensation component includes a connecting rod 3 and a first spring 4. The top of the connecting rod 3 is connected to the pressure rod 2, and the first spring 4 is sleeved on the outside of the connecting rod 3. The first end of the first spring 4 is connected to the connecting rod 3 or the pressure rod 2, and the second end of the first spring 4 abuts against the mold 1. Arranging two or more sets of molds 1 on the same table ensures that the reference plane of the molds 1 is consistent. The certain distance between the molds 1 and adjacent molds 1 can avoid interference during operation. The molds 1 share the same set of wire drawing equipment for production, which improves the utilization rate of the table. When a mold 1 needs to be replaced or malfunctions, only the corresponding wire needs to be cut, without affecting the production of other molds 1. The pressure rod 2 is elongated, its length covering both sets of molds 1 and the area between them. The pressure rod 2 forms a limit at the top of mold 1, ensuring its stable placement on the table and the movement of raw material within it along the preset pultrusion path. The elastic compensation component achieves dynamic pressure compensation for mold 1 through elastic deformation, preventing the two sets of molds 1 from being unable to withstand proper pressure due to different heights under the pressure rod 2. The connecting rod 3 prevents lateral displacement and torsion of the first spring 4 during extension and retraction, ensuring the spring force always acts perpendicularly to the raw material surface, guaranteeing the directionality and stability of pressure compensation. The first spring 4 is in a slightly compressed state, applying a preset initial pressure to mold 1. The first spring 4 ensures a constant pressure transmission between the pressure rod 2 and mold 1, acting as an elastic buffer to maintain pressure on mold 1 through its own elastic deformation. The first spring 4 applies pressure to mold 1 through elastic contact, resulting in a gentle and uniform pressure application that avoids physical damage to the mold 1 surface.

[0019] The pultrusion apparatus with dual molds 1 according to the embodiments of the present invention has the advantages brought about by the independent claims.

[0020] In some embodiments, the connecting rod 3 is a stepped shaft with an upper section and a lower section. The diameter of the upper section of the stepped shaft is larger than the diameter of the lower section. The first spring 4 is sleeved on the lower section of the stepped shaft, and the upper section is connected to the pressure rod 2 by bolts.

[0021] Specifically, the connecting rod 3 adopts a stepped shaft with a thicker upper section and a thinner lower section. The stepped surface between the upper and lower sections can be used to abut the first spring 4. The annular stepped surface between the two sections acts as an axial limiting block for the first spring 4. During the pultrusion process, even if the spring contracts upward due to elastic deformation, its upper end surface will be blocked by the stepped surface of the stepped shaft, preventing it from moving further upward and avoiding the first spring 4 from coming off. The inner diameter of the first spring 4 matches the diameter of the lower section of the stepped shaft, limiting the lateral swing of the first spring 4 during the extension and retraction process to ensure that the elastic force always acts perpendicularly on the surface of the raw material, ensuring the accuracy of pressure compensation. The upper section of the stepped shaft is provided with a threaded hole. After the bolt passes through the pressure rod 2, it enters the threaded hole and is threadedly connected and fixed to the stepped shaft.

[0022] In some embodiments, a second spring 5 is also included, which is arranged on the upper section of the stepped shaft and fixedly connected to the upper section of the stepped shaft. The second spring 5 is sleeved on the outside of the first spring 4.

[0023] Specifically, the second spring 5 is coaxial with the first spring 4, and the inner diameter of the second spring 5 is larger than the outer diameter of the first spring 4. The second spring 5 can be fixed to the upper section of the stepped shaft by welding or by bolts, clips, etc. The second spring 5 and the first spring 4 have different elastic coefficients. The two working together can achieve layered response to the fluctuations of the mold 1, avoiding the problem that a single spring with a fixed elastic coefficient cannot adapt to large changes in the size of the mold 1. When the fluctuation is small, such as within 0.5mm, only the first spring 4 alone provides gentle basic pressure compensation. When the fluctuation is greater than 0.5mm, the compression of the first spring 4 reaches the threshold, and the second spring 5 participates in the expansion and contraction. The two springs work together to provide pressure compensation, which can prevent the first spring 4 from being overloaded and damaged. The second spring 5, sleeved on the outside of the first spring 4, also plays a role in radial constraint on the first spring 4. The second spring 5 increases the redundancy range of the elastic compensation component and improves safety.

[0024] In some embodiments, the pressure bar 2 extends perpendicular to the extension direction of the mold 1, and the length of the pressure bar 2 is greater than the sum of the widths of the mold 1 on the table.

[0025] Specifically, the length of the pressure bar 2 is completely perpendicular to the extension direction of the mold 1 (i.e., perpendicular to the pultrusion direction of the raw material). The pressure bar 2 laterally spans the entire mold 1 area on the table, ensuring that the pressure bar 2 can simultaneously cover the width of two or more molds 1. This avoids pressure transmission blind spots caused by minor adjustments or offsets in the position of the mold 1, which could result in the pressure bar 2 not completely covering the mold 1. The pressure bar 2 can be made of long strip-shaped alloy steel with a rectangular or circular cross-section. A rectangular cross-section facilitates uniform pressure transmission.

[0026] In some embodiments, an adjusting member is also included, which is arranged on the connecting rod 3 of the elastic compensator to control the initial pressure of the elastic compensator. The adjusting member includes a limiting ring and a locking bolt. The limiting ring is sleeved on the connecting rod 3 and connected to the first end of the first spring 4. The locking bolt passes through the limiting ring and abuts against the connecting rod 3. Figure 2 The limiting ring of the first spring 4 is not shown, and another limiting ring is exemplarily arranged at the end of the second spring 5 to illustrate the position of the limiting ring. Figure 2 The position of the second spring 5 is only used to indicate the length difference between it and the first spring 4. In actual application, the end of the second spring 5 is closer to the mold 1.

[0027] Specifically, the adjusting component is used to adjust the position of the first spring 4, which can change the initial pressure of the first spring 4 on the mold 1. The limiting ring, sleeved on the connecting rod 3, can move along the axial direction of the connecting rod 3. As the limiting ring moves, the distance between the limiting ring and the mold 1 decreases or increases, changing the force and elastic deformation of the first spring 4. The inner diameter of the limiting ring can match the diameter of the lower section of the stepped shaft, so that the limiting ring and the lower section of the stepped shaft form a surface contact, stably transmitting pressure. The length of the locking bolt is greater than the thickness of the limiting ring. There can be multiple locking bolts. After the locking bolt passes through the threaded hole of the limiting ring, the end of the locking bolt abuts tightly against the outer surface of the stepped shaft, and the position of the limiting ring is fixed by the frictional force generated by the tightening force of the bolt. To enhance the fixing effect, anti-slip washers (such as copper washers or rubber washers) can be added to the bolt ends to prevent the bolts from loosening due to long-term vibration, ensuring the stability of the limiting ring position, and thus maintaining the constant initial pressure of the first spring 4. After loosening the locking bolt, release the limit ring from its fixation, move the limit ring to the target position, and retighten the locking bolt to complete the adjustment of the first spring 4.

[0028] Optionally, the second spring 5 can also be fixed to the upper section of the stepped shaft by the same means of a limiting ring and a locking bolt.

[0029] In some embodiments, a pressure sensor is also included, which is arranged at the connection between the pressure rod 2 and the elastic compensator to detect the pressing pressure.

[0030] Specifically, the pressure sensor can capture the instantaneous changes in pressure during the pultrusion process in real time by sensing the minute deformation caused by pressure through strain gauges. One pressure sensor is configured at each connection point between the stepped shaft and the pressure rod 2 along the length of the rod 2 to achieve distributed monitoring of pressure in different areas of the pressure rod 2, avoiding pressure blind spots caused by single-point monitoring.

[0031] In some embodiments, a heat dissipation channel is formed between any two adjacent sets of molds 1, and heat dissipation pipes are arranged in the heat dissipation channel to increase heat dissipation. The heat dissipation pipes extend along the length of the mold 1 and are connected to a cold source.

[0032] Specifically, the heat dissipation channel is formed by the gap between two adjacent molds 1. The channel height is the same as the mold 1 height. The heat dissipation pipes are made of copper or aluminum alloy, with circular or rectangular cross-sections to maximize the heat dissipation area while ensuring strength. The heat dissipation pipes extend along the length of mold 1 (i.e., the pultrusion direction), completely penetrating the heat dissipation channel, and maintain a 5-8mm gap between the heat dissipation pipes and the side of mold 1 to prevent the high temperature of mold 1 from being directly conducted to the heat dissipation pipes and causing localized overheating. The heat dissipation pipes are connected to a cold source such as an industrial chiller or cooling fan via flexible hoses.

[0033] In some embodiments, a heat-conducting oil channel is provided inside the heat-conducting beam, the second end of the first spring 4 is connected to the heat-conducting beam, and the bottom of the heat-conducting beam abuts against the top of the mold 1.

[0034] Specifically, the heating beam is long and rectangular in cross-section. A continuous heat-conducting oil channel, circular in cross-section, runs along the beam's length. This channel is positioned at the geometric center of the beam's cross-section to ensure uniform heat transfer throughout the entire beam. The bottom of the heating beam is fully fitted to the top of mold 1, ensuring efficient heat transfer. Simultaneously, the pressure from the first spring 4 is stably transferred to mold 1 via the heating beam. The heating beam assists in temperature control, working in conjunction with the heat dissipation channels to achieve temperature balance. The heating beam covering the top of mold 1 ensures uniform pressure transfer from the first spring 4 to the entire mold 1.

[0035] In some embodiments, the heat transfer oil channel is a spirally wound channel, and the inlet and outlet of the heat transfer oil channel are connected to the oil tank through pipelines.

[0036] Specifically, the heat transfer oil channel extends and coils inside the heat beam with a helix angle of 15°-20°. The pitch is adjusted according to the width of the heat beam. The spiral channel is centrally located inside the heat beam to increase the heat exchange area, thus extending the heat exchange time between the heat transfer oil and the heat beam and resulting in a faster temperature response.

[0037] In some embodiments, a buffer layer is provided at the bottom of the thermal beam to prevent the thermal beam from rigidly contacting the top of the mold 1.

[0038] Specifically, the buffer layer includes silicone rubber and thermally conductive filler. The silicone rubber can be methyl vinyl silicone rubber, and the nano-sized alumina thermally conductive filler improves the thermal conductivity. If the thermal beam and mold 1 are in direct contact, the vibration during equipment operation will cause continuous friction between their surfaces. The buffer layer plays a buffering role between the two, uniformly transmits pressure, and transfers heat through the thermally conductive filler.

[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A twin-mold pultrusion device, characterized by, include: Molds, at least two sets of molds are fixed on the same table and spaced a certain distance apart; A limiting mechanism is provided, comprising a pressure rod and an elastic compensating member. The pressure rod is located above the two molds, and the elastic compensating member is located between the pressure rod and the molds. The elastic compensating member comprises a connecting rod and a first spring. The top of the connecting rod is connected to the pressure rod, and the first spring is sleeved on the outside of the connecting rod. The first end of the first spring is connected to the connecting rod or the pressure rod, and the second end of the first spring abuts against the mold.

2. The dual-mold pultrusion device of claim 1, wherein, The connecting rod is a stepped shaft with an upper section and a lower section. The diameter of the upper section of the stepped shaft is larger than the diameter of the lower section. The first spring is sleeved on the lower section of the stepped shaft, and the upper section is connected to the pressure rod by bolts.

3. The dual-mold pultrusion apparatus of claim 2, wherein, It also includes a second spring, which is arranged on the upper section of the stepped shaft and fixedly connected to the upper section of the stepped shaft. The second spring is sleeved on the outside of the first spring.

4. The dual-mold pultrusion apparatus of claim 1, wherein, The pressure bar extends perpendicular to the extension direction of the mold, and the length of the pressure bar is greater than the sum of the widths of the molds on the table.

5. The dual-mold pultrusion device of claim 1, wherein, It also includes an adjusting component, which is arranged on the connecting rod of the elastic compensator to control the initial pressure of the elastic compensator. The adjusting component includes a limiting ring and a locking bolt. The limiting ring is sleeved on the connecting rod and connected to the first end of the first spring. The locking bolt passes through the limiting ring and abuts against the connecting rod.

6. The dual-mold pultrusion device of claim 1, wherein, It also includes a pressure sensor, which is arranged at the connection between the pressure rod and the elastic compensator to detect the pressing pressure.

7. The dual-mold pultrusion apparatus of claim 1, wherein, A heat dissipation channel is formed between any two adjacent sets of the molds, and heat dissipation pipes are arranged in the heat dissipation channel to increase heat dissipation. The heat dissipation pipes extend along the length of the mold and are connected to a cold source.

8. The dual-mold pultrusion device of claim 1, wherein, It also includes a heating beam, which has a heat-conducting oil channel inside. The second end of the first spring is connected to the heating beam, and the bottom of the heating beam abuts against the top of the mold.

9. The dual-mold pultrusion apparatus of claim 8, wherein, The heat transfer oil channel is a spirally coiled channel, and the inlet and outlet of the heat transfer oil channel are connected to the oil tank through pipelines.

10. The dual-mold pultrusion device of claim 8, wherein, A buffer layer is provided at the bottom of the thermal beam to prevent the thermal beam from rigidly contacting the top of the mold.

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