Pultrusion mold

Abstract

The present disclosure discloses a pultrusion mold, comprising a mold assembly, a first thermal insulation element, and a second thermal insulation element. The mold assembly has a mold cavity, a first thermal insulation groove, and a second thermal insulation groove. The mold cavity comprises an injection section, a transition section and a heating section, arranged in sequence along a length direction of the mold cavity. The first thermal insulation groove and the second thermal insulation groove are disposed at opposite sides of the transition section. A first spacing portion is provided between the first thermal insulation groove and the transition section, and a second spacing portion is provided between the second thermal insulation groove and the transition section. The first thermal insulation element is disposed in the first thermal insulation groove, and the second thermal insulation element is disposed in the second thermal insulation groove.

Description

Pultrusion die

[0001] Cross-reference to related applications

[0002] The present application is based on the Chinese patent application No. 202421945301.7, filed on August 12, 2024, and claims priority to the Chinese patent application, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of pultrusion equipment, in particular to a pultrusion die. BACKGROUND

[0004] The polyurethane pultrusion die is an important tool for manufacturing polyurethane pultrusion products, which includes a glue injection part and a heating part, the glue injection part has a glue injection hole for injecting polyurethane; fibers (such as glass fibers, carbon fibers) keep running in the die, during the running process, the fibers first complete the infiltration with the polyurethane resin in the glue injection part, and then realize high-temperature curing and forming through the heating part, and after demolding, the polyurethane pultrusion product is formed.

[0005] In the related art, the pultrusion die for polyurethane pultrusion products is split type, i.e., the glue injection part and the heating part are splitly arranged, and a heat insulation plate such as rock wool plate is used to isolate the two parts, so that the cavity wall of the die cavity is discontinuous, which leads to the phenomenon of polyurethane curing residue in the discontinuous area of the die cavity, and further leads to quality problems such as surface defects and unevenness of the product. At the same time, the polyurethane residue curing increases the friction force in the running process of the fibers, which leads to the increase of the traction force, and further leads to the decrease of the strength, toughness and other properties of the product.

[0006] Practical new type content

[0007] The present disclosure aims to at least solve one of the technical problems in the related art to some extent.

[0008] To this end, the embodiment of the present disclosure provides a pultrusion die, the first heat insulation member and the second heat insulation member can play a heat insulation role between the heating section and the glue injection part, and at the same time, the cavity wall of the die cavity for the pultrusion product to pass through can be kept continuous, so as to avoid the phenomenon of polyurethane curing residue due to the discontinuity of the cavity wall of the die cavity, and improve the product performance.

[0009] The pultrusion die of the embodiments of the present disclosure comprises a die assembly, a first heat insulation member and a second heat insulation member, the die assembly has a die cavity, a first heat insulation groove and a second heat insulation groove, the die cavity comprises a glue injection section, a transition section and a heating section arranged in sequence along the length direction of the die cavity, the first heat insulation groove and the second heat insulation groove are oppositely arranged on the two sides of the transition section, the first heat insulation groove and the transition section have a first spacing part, and the second heat insulation groove and the transition section have a second spacing part; the first heat insulation member is arranged in the first heat insulation groove, and the second heat insulation member is arranged in the second heat insulation groove.

[0010] In some embodiments, the die assembly comprises a first die and a second die, the first die has a first half cavity, the second die has a second half cavity, and the second die is connected with the first die to form the die cavity through the first half cavity and the second half cavity.

[0011] In some embodiments, the first die and the second die are detachably connected.

[0012] In some embodiments, the first die comprises a first core die, a first glue injection outer die and a first heating outer die, the first glue injection outer die and the first heating outer die are spaced apart along the length direction of the die cavity and are both connected with the first core die, and the first glue injection outer die and the first heating outer die form the first heat insulation groove; the second die comprises a second core die, a second glue injection outer die and a second heating outer die, the second core die is connected with the first core die and surrounds the die cavity, the second glue injection outer die and the second heating outer die are spaced apart along the length direction of the die cavity and are both connected with the second core die, and the second glue injection outer die and the second heating outer die form the second heat insulation groove.

[0013] In some embodiments, the first die further comprises a first connecting plate connected with the first glue injection outer die and the first heating outer die; and / or the second die further comprises a second connecting plate connected with the second glue injection outer die and the second heating outer die.

[0014] In some embodiments, the first connecting plate is arranged on the side of the first glue injection outer die away from the first core die, the first die further comprises a first heat insulation sheet arranged between the first connecting plate and the first glue injection outer die; and / or the first heat insulation sheet is arranged between the first connecting plate and the first heating outer die.

[0015] In some embodiments, the second connecting plate is arranged on a side of the second glue injection outer mold away from the second core mold, and the second mold further comprises a second heat insulation sheet arranged between the second connecting plate and the second glue injection outer mold; and / or the second heat insulation sheet is arranged between the second connecting plate and the second glue injection outer mold.

[0016] In some embodiments, the glue injection section comprises a communication section and an infiltration section arranged in sequence, the infiltration section is arranged between the communication section and the heating section, and the cross section of the infiltration section increases first and then decreases from the communication section to the heating section; the mold assembly has a glue injection hole in communication with the infiltration section.

[0017] In some embodiments, at least one of the first connecting plate and the second connecting plate is a bakelite plate.

[0018] In some embodiments, at least one of the first heat insulation member and the second heat insulation member is a ceramic material.

[0019] The pultrusion mold of the embodiments of the present disclosure is arranged between the heating section and the glue injection section in the length direction of the mold cavity, and can block the heat of the heating section from being transmitted to the glue injection section; meanwhile, the first interval part is arranged between the second heat insulation groove and the transition section, and the second interval part is arranged between the second heat insulation groove and the transition section, that is, the first heat insulation groove and the second heat insulation groove do not completely separate the mold assembly, which can ensure the continuity and integrity of the mold cavity in the length direction of the mold cavity, thereby avoiding the phenomenon of polyurethane curing residual due to the discontinuity of the cavity wall of the mold cavity, reducing the probability of quality problems such as surface defects of the product, and improving the strength, toughness and other properties of the product. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is a schematic structural diagram of a pultrusion mold according to an embodiment of the present disclosure.

[0021] FIG. 2 is a schematic structural diagram of the pultrusion mold according to an embodiment of the present disclosure from another angle.

[0022] FIG. 3 is a sectional view of A-A in FIG. 2.

[0023] FIG. 4 is an enlarged schematic view of B in FIG. 3.

[0024] FIG. 5 is an exploded schematic view of the pultrusion mold according to an embodiment of the present disclosure.

[0025] 100, pultrusion die; 1, first die; 11, first heat insulation groove; 12, first core mold; 13, first glue injection outer mold; 14, first heating outer mold; 15, first connecting plate; 16, glue injection hole; 2, second die; 21, second heat insulation groove; 22, second core mold; 23, second glue injection outer mold; 24, second heating outer mold; 25, second connecting plate; 3, mold cavity; 31, glue injection section; 311, communication section; 312, infiltration section; 32, transition section; 33, heating section; 41, first heat insulation piece; 42, second heat insulation piece; 43, first heat insulation sheet; 44, second heat insulation sheet. DETAILED DESCRIPTION

[0026] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0027] As shown in FIGS. 1 to 4, the pultrusion die 100 of the embodiments of the present disclosure comprises a mold assembly, a first heat insulation piece 41 and a second heat insulation piece 42, the mold assembly has a mold cavity 3, a first heat insulation groove 11 and a second heat insulation groove 21, the mold cavity 3 comprises a glue injection section 31, a transition section 32 and a heating section 33 arranged in sequence along the length direction of the mold cavity 3, the first heat insulation groove 11 and the second heat insulation groove 21 are oppositely arranged on both sides of the transition section 32, the first heat insulation groove 11 has a first interval part with the transition section 32, and the second heat insulation groove 21 has a second interval part with the transition section 32; the first heat insulation piece 41 is arranged in the first heat insulation groove 11, and the second heat insulation piece 42 is arranged in the second heat insulation groove 21.

[0028] The pultrusion die 100 of the embodiments of the present disclosure, in terms of the length direction of the mold cavity 3, the first heat insulation piece 41 and the second heat insulation piece 42 are both arranged between the heating section 33 and the glue injection section 31, which can block the heat of the heating section 33 from being transmitted to the glue injection section 31; at the same time, the first heat insulation groove 11 has the first interval part with the transition section 32, and the second heat insulation groove 21 has the second interval part with the transition section 32, that is, the first heat insulation groove 11 and the second heat insulation groove 21 do not completely cut off the mold assembly, which can ensure the continuity and integrity of the mold cavity 3 along the length direction of itself, thereby avoiding the phenomenon of polyurethane curing residual due to the discontinuity of the cavity wall of the mold cavity 3, reducing the probability of quality problems such as surface defects of the product, and improving the strength, toughness and other properties of the product.

[0029] As shown in FIG. 1 and FIG. 2, the pultrusion die 100 is in the shape of a long rectangular body as a whole, and the die cavity 3 penetrates through the length direction of the die 100. The two sides of the die assembly correspond to the heating section 33, and the heating device is arranged on the two sides to heat the heating section 33 to achieve resin curing. The transition section 32 is arranged between the glue injection section 31 and the heating section 33, and the two side walls of the transition section 32 form the first and second spacing sections. The fibers pass through the glue injection section 31, the transition section 32 and the heating section 33 in turn, and can be combined with polyurethane resin to form a polyurethane pultrusion product.

[0030] In some embodiments, at least one of the first and second thermal insulation members 41 and 42 is made of ceramic material.

[0031] The ceramic thermal insulation material has a porous structure, which can effectively reduce the thermal conductivity of the material, prevent heat transfer, and achieve good thermal insulation effect. At the same time, the ceramic material can maintain stable performance in a high temperature environment, thereby reducing the risk of deformation of the first and second thermal insulation members 41 and 42 in a high temperature environment, which may cause damage to the pultrusion die 100.

[0032] In some embodiments, the die assembly includes a first die 1 having a first half cavity and a second die 2 having a second half cavity. The second die 2 is connected to the first die 1 to form the die cavity 3 through the first and second half cavities.

[0033] The die assembly is divided into the first and second dies 1 and 2, which makes the design and production of the pultrusion die 100 simpler, thereby reducing the production cost.

[0034] In some embodiments, the first and second dies 1 and 2 are detachably connected.

[0035] When the pultrusion die 100 fails, only the damaged part can be replaced, thereby reducing the maintenance cost.

[0036] In some embodiments, as shown in FIG. 5, the first die 1 includes a first core die 12, a first glue injection outer die 13 and a first heating outer die 14. The first glue injection outer die 13 and the first heating outer die 14 are arranged in the length direction of the die cavity 3 and are connected to the first core die 12. The first glue injection outer die 13 and the first heating outer die 14 form the first thermal insulation groove 11. The second die 2 includes a second core die 22, a second glue injection outer die 23 and a second heating outer die 24. The second core die 22 is connected to the first core die 12 and surrounds the die cavity 3. The second glue injection outer die 23 and the second heating outer die 24 are arranged in the length direction of the die cavity 3 and are connected to the second core die 22. The second glue injection outer die 23 and the second heating outer die 24 form the second thermal insulation groove 21.

[0037] Through the above arrangement, the first mold 1 and the second mold 2 are both composed of multiple components, the production and processing of each component are more convenient, thereby further improving the processing and use flexibility of the pultrusion mold 100, and reducing the production cost and maintenance cost.

[0038] Optionally, the first core mold 12 and the second core mold 22 are made of high-hardness alloy steel.

[0039] Optionally, the first glue injection outer mold 13 and the first heating outer mold 14 are made of P20 plastic mold steel.

[0040] As an example, as shown in FIG. 1 and FIG. 5, the first core mold 12 has the first half cavity described above, the second core mold 22 has the second half cavity described above, the first core mold 12 has two rows of first connecting holes, the two rows of first connecting holes are arranged on both sides of the first half cavity, and the same row of first connecting holes is uniformly arranged along the length direction of the first core mold 12. The structure of the second core mold 22 is the same as that of the first core mold 12, that is, the second core mold 22 also has two rows of first connecting holes; aligning the first core mold 12 with the second core mold 22 can align the two rows of first connecting holes of the first core mold 12 with the two rows of first connecting holes of the second core mold 22, and the first half cavity and the second half cavity form the mold cavity 3 described above.

[0041] The first glue injection outer mold 13 and the second glue injection outer mold 23 are symmetrically arranged on both sides of the mold cavity 3, the first glue injection outer mold 13 has two rows of second connecting holes uniformly arranged along the length direction thereof, and the second glue injection outer mold 23 has the same structure as the first glue injection outer mold 13, that is, the second glue injection outer mold 23 also has two rows of second connecting holes.

[0042] The first heating outer mold 14 and the second heating outer mold 24 are symmetrically arranged on both sides of the mold cavity 3, the first heating outer mold 14 has two rows of third connecting holes uniformly arranged along the length direction thereof, and the second heating outer mold 24 has the same structure as the first heating outer mold 14, that is, the second heating outer mold 24 also has two rows of third connecting holes.

[0043] After aligning the first core mold 12 and the second core mold 22, the first glue injection outer mold 13 and the second glue injection outer mold 23 are respectively placed on both sides of the first core mold 12 and the second core mold 22, and the second connecting holes are aligned with part of the first connecting holes, thereby the first core mold 12, the second core mold 22, the first glue injection outer mold 13, and the second glue injection outer mold 23 can be connected through multiple bolts; then the first heating outer mold 14 and the second heating outer mold 24 are respectively placed on both sides of the first core mold 12 and the second core mold 22, and the third connecting holes are aligned with the remaining first connecting holes, thereby the first core mold 12, the second core mold 22, the first heating outer mold 14, and the second heating outer mold 24 can be connected through multiple bolts.

[0044] The first heat insulation groove 11 is formed between the first glue injection outer mold 13 and the first heating outer mold 14, and the second heat insulation groove 21 is formed between the second glue injection outer mold 23 and the second heating outer mold 24.

[0045] In addition, the first core mold 12 and the second core mold 22 each have two first mounting holes, the first mounting holes are arranged in a staggered manner with the first connecting holes, the first mounting holes on the first core mold 12 are arranged in the first heat insulation groove 11, and the first mounting holes on the second core mold 22 are arranged in the second heat insulation groove 21. The first heat insulation piece 41 is in the shape of a rectangular body, has two second mounting holes arranged on two sides of the mold cavity 3 respectively, and the second heat insulation piece 42 has the same structure as the first heat insulation piece 41, that is, the second heat insulation piece 42 also has two second mounting holes, and the first mounting holes and the second mounting holes are matched.

[0046] The first heat insulation piece 41 is placed in the first heat insulation groove 11, the second heat insulation piece 42 is placed in the second heat insulation groove 21, and the second mounting holes are aligned with the first mounting holes, so that the first heat insulation piece 41 and the second heat insulation piece 42 are connected with the first core mold 12 and the second core mold 22 through bolts; thus, the preliminary assembly of the pultrusion mold 100 can be realized.

[0047] It can be understood that the assembly sequence of the first glue injection outer mold 13, the second glue injection outer mold 23, the first heating outer mold 14, the second heating outer mold 24, the first heat insulation piece 41, and the second heat insulation piece 42, and the first core mold 12 and the second core mold 22 can be adaptively adjusted according to actual installation.

[0048] In some embodiments, the first mold 1 further comprises a first connecting plate 15 connected to the first glue injection outer mold 13 and the first heating outer mold 14; and / or the second mold 2 further comprises a second connecting plate 25 connected to the second glue injection outer mold 23 and the second heating outer mold 24.

[0049] The first glue injection outer mold 13 and the first heating outer mold 14 are connected through the first connecting plate 15, which can improve the connection strength of the first glue injection outer mold 13 and the first heating outer mold 14, and at the same time, the first connecting plate 15 can also limit the first heat insulation piece 41. Similarly, the second glue injection outer mold 23 and the second heating outer mold 24 are connected through the second connecting plate 25, which can improve the connection strength of the second glue injection outer mold 23 and the second heating outer mold 24, and at the same time, the second connecting plate 25 can also limit the second heat insulation piece 42, thereby improving the overall stability of the pultrusion mold 100.

[0050] In some embodiments, the first connecting plate 15 is arranged on the side of the first glue injection outer mold 13 away from the first core mold 12, and the first mold 1 further comprises a first heat insulation sheet 43, which is arranged between the first connecting plate 15 and the first glue injection outer mold 13; and / or the first heat insulation sheet 43 is arranged between the first connecting plate 15 and the first heating outer mold 14.

[0051] By arranging the first heat insulation sheet 43, the heat of the first heating outer mold 14 can be blocked from being transmitted to the first glue injection outer mold 13 through the first connecting plate 15, and the heat of the heating section 33 can be blocked from being transmitted to the glue injection section 31.

[0052] Optionally, as shown in FIGS. 4 and 5, the number of the first heat insulation sheets 43 is two, one of which is arranged between the first connecting plate 15 and the first glue injection outer mold 13, and the other of which is arranged between the first connecting plate 15 and the first heating outer mold 14.

[0053] Therefore, the heat transmission between the first connecting plate 15 and the first heating outer mold 14 is initially blocked, and the heat transmission between the first connecting plate 15 and the first glue injection outer mold 13 is re-blocked, so that a better heat insulation effect is achieved.

[0054] In some embodiments, the second connecting plate 25 is arranged on the side of the second glue injection outer mold 23 away from the second core mold 22, and the second mold 2 further comprises a second heat insulation sheet 44, which is arranged between the second connecting plate 25 and the second glue injection outer mold 23; and / or the second heat insulation sheet 44 is arranged between the second connecting plate 25 and the second glue injection outer mold 23.

[0055] Optionally, as shown in FIGS. 4 and 5, the number of the second heat insulation sheets 44 is two, one of which is arranged between the second connecting plate 25 and the second glue injection outer mold 23, and the other of which is arranged between the second connecting plate 25 and the second heating outer mold 24.

[0056] Therefore, the heat transmission between the second connecting plate 25 and the second heating outer mold 24 is initially blocked, and the heat transmission between the second connecting plate 25 and the second glue injection outer mold 23 is re-blocked, so that a better heat insulation effect is achieved.

[0057] In some embodiments, at least one of the first connecting plate 15 and the second connecting plate 25 is a bakelite plate.

[0058] The bakelite plate has a low thermal conductivity and has the characteristics of high temperature resistance and anti-static, which can further improve the heat insulation performance of the first heat insulation sheet 43 and the second heat insulation sheet 44.

[0059] In some embodiments, as shown in FIGS. 4 and 5, the glue injection section 31 comprises a communication section 311 and an infiltration section 312 arranged in sequence, the infiltration section 312 is arranged between the communication section 311 and the heating section 33, the cross section of the infiltration section 312 increases first and then decreases from the communication section 311 to the heating section 33; the mold assembly has a glue injection hole 16, the glue injection hole 16 communicates with the infiltration section 312.

[0060] Due to the larger cross section of the infiltration section 312, when the fiber passes through the infiltration section 312, the polyurethane resin can completely wrap the fiber, so that the fiber is fully contacted and uniformly mixed with the polyurethane resin, the bonding force between the fiber and the resin is improved, and thus the mechanical properties of the polyurethane pultrusion product are improved.

[0061] As an example, as shown in FIG. 4, the infiltration section 312 comprises a first part and a second part arranged in sequence from the communication section 311 to the heating section 33, the cross section of the first part gradually increases from the communication section 311 to the heating section 33, and the cross section of the second part gradually decreases from the communication section 311 to the heating section 33; the glue injection hole 16 is communicated at the joint position of the first part and the second part, the glue injection hole 16 penetrates the first glue injection outer mold 13 and the first core mold 12 in sequence, and the polyurethane resin can be injected into the infiltration section 312 through the glue injection hole 16.

[0062] Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present disclosure, and the changes, modifications, replacements and variations made by those of ordinary skill in the art to the above-mentioned embodiments are within the protection scope of the present disclosure.

Claims

1. A pultrusion die (100), comprising: a die assembly having a die cavity (3), a first heat insulation groove (11) and a second heat insulation groove (21), the die cavity (3) comprising a glue injection section (31), a transition section (32) and a heating section (33) arranged in sequence along a length direction of the die cavity (3), the first heat insulation groove (11) and the second heat insulation groove (21) being oppositely arranged at two sides of the transition section (32), the first heat insulation groove (11) and the transition section (32) having a first interval, the second heat insulation groove (21) and the transition section (32) having a second interval; a first heat insulation member (41) arranged in the first heat insulation groove (11) and a second heat insulation member (42) arranged in the second heat insulation groove (21).

2. The pultrusion die (100) according to claim 1, wherein the die assembly comprises a first die (1) having a first half cavity and a second die (2) having a second half cavity, the second die (2) being connected with the first die (1) to form the die cavity (3) by the first half cavity and the second half cavity.

3. The pultrusion die (100) according to claim 2, wherein the first die (1) and the second die (2) are detachably connected.

4. The pultrusion die (100) of claim 2, wherein, the first die (1) comprises a first core die (12), a first glue injection outer die (13) and a first heating outer die (14), the first glue injection outer die (13) and the first heating outer die (14) being spaced apart along the length direction of the die cavity (3) and both being connected with the first core die (12), the first glue injection outer die (13) and the first heating outer die (14) forming the first heat insulation groove (11) therebetween; the second die (2) comprises a second core die (22), a second glue injection outer die (23) and a second heating outer die (24), the second core die (22) being connected with the first core die (12) and surrounding the die cavity (3), the second glue injection outer die (23) and the second heating outer die (24) being spaced apart along the length direction of the die cavity (3) and both being connected with the second core die (22), the second glue injection outer die (23) and the second heating outer die (24) forming the second heat insulation groove (21) therebetween.

5. The pultrusion die (100) according to claim 4, wherein the first die (1) further comprises a first connecting plate (15) connected with the first glue injection outer die (13) and the first heating outer die (14); and / or the second die (2) further comprises a second connecting plate (25) connected with the second glue injection outer die (23) and the second heating outer die (24).

6. The pultrusion die (100) according to claim 5, wherein the first connecting plate (15) is arranged on a side of the first glue injection outer die (13) away from the first core die (12), the first die (1) further comprises a first heat insulation sheet (43) arranged between the first connecting plate (15) and the first glue injection outer die (13); and / or the second connecting plate (25) is arranged on a side of the second glue injection outer die (23) away from the second core die (22), the second die (2) further comprises a second heat insulation sheet (44) arranged between the second connecting plate (25) and the second glue injection outer die (23). The first heat insulation sheet (43) is arranged between the first connecting plate (15) and the first heating outer mold (14).

7. The pultrusion die (100) of claim 5, wherein, The second connecting plate (25) is arranged on the side of the second glue injection outer mold (23) away from the second core mold (22), the second mold (2) further comprises a second heat insulation sheet (44), the second heat insulation sheet (44) is arranged between the second connecting plate (25) and the second glue injection outer mold (23); and / or The second heat insulation sheet (44) is arranged between the second connecting plate (25) and the second glue injection outer mold (23).

8. The pultrusion die (100) according to any one of claims 1-7, wherein, The glue injection section (31) comprises a communication section (311) and an infiltration section (312) arranged in sequence, the infiltration section (312) is arranged between the communication section (311) and the heating section (33), the cross section of the infiltration section (312) increases first and then decreases from the communication section (311) to the heating section (33); The mold assembly has a glue injection hole (16), the glue injection hole (16) is communicated with the infiltration section (312).

9. The pultrusion die (100) of claim 5, wherein, At least one of the first connecting plate (15) and the second connecting plate (25) is a bakelite plate.

10. The pultrusion die (100) according to any one of claims 1-9, wherein, At least one of the first heat insulation piece (41) and the second heat insulation piece (42) is a ceramic material.

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