Glue injection pipe seat with residual glue discharging function and residual glue discharging method

Abstract

The invention discloses a glue injection tube seat with a residual glue discharging function and a residual glue discharging method.The glue injection tube seat with the residual glue discharging function is used in a vacuum glue injection system of a blade and comprises a corner piece part and an injection tube connector and further comprises an electric heating piece, and a heating groove is formed in the upper portion of the outer wall of the corner piece part; the heating groove is arranged along the length direction of the corner piece part in a full-length mode, and the electric heating piece is laid in the heating groove. The corner piece part of the glue injection pipe seat is independently heated in an electric heating mode, so that the corner piece part is completely expanded, and residual glue liquid in the pipe is completely discharged.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade manufacturing, and particularly to a glue injection pipe seat with a function of discharging residual glue and a method for discharging residual glue. Background Art

[0002] With the increasing size and higher precision requirements of wind turbine blades, the existing hand lay-up process, compression molding process, and prepreg laying process used in the production of wind turbine blades are becoming more and more difficult to operate, and the quality is also difficult to guarantee. In recent years, the vacuum infusion molding process has become the mainstream process for manufacturing wind turbine blades. This process can fully eliminate air bubbles, reduce the porosity of products, and effectively control the resin content of products.

[0003] The existing vacuum injection and infusion molding process widely uses PE materials to make Ohm tubes as the channels for transporting resin glue. The Ohm tubes have a relatively high softening temperature and high structural strength. During the subsequent heating and curing process, a large amount of residual glue in the injection Ohm tubes solidifies. This causes a certain amount of waste, and at the same time, it will also cause a pipeline mark to form on the surface of the molded blade at the position where the Ohm tube is placed. The resin content here is relatively high, affecting the uniformity of the blade density and posing a certain quality risk.

[0004] The invention patent with the publication number CN118046593A discloses a resin injection runner assembly for wind turbine blades and its working method, which is a prior application patent of the applicant. In the technical solution of this patent, an airbag is arranged in the inner cavity of the angle plate runner part of the glue injection pipe seat. By inflating and expanding the airbag, the residual glue in the cavity of the angle plate runner part can be extruded and injected into the blade ply structure. Although most of the residual glue in the glue injection pipe seat can be extruded, there are two problems. One is that due to the narrow space at the corner position, the cylindrical airbag cannot be squeezed in place very well, resulting in more residual glue at the corner position and still causing obvious marks. The other is that during the glue injection process, the flowing glue may wash the airbag off the rubber band, causing blockage, resulting in poor glue flow and the risk of failure in the manufacture of the entire blade.

[0005] In order to overcome the above problems, a glue injection pipe seat with a function of discharging residual glue and a method for discharging residual glue are needed. Summary of the Invention

[0006] The purpose of the present invention is to provide a glue injection pipe seat with a function of discharging residual glue and a method for discharging residual glue. By using an electric heating method to separately heat the corner piece part of the glue injection pipe seat, the corner piece part is fully expanded, and then the residual glue in the pipe is more completely discharged.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention relates to a glue injection pipe seat with a function of discharging residual glue, which is used in the vacuum glue injection system of blades. It includes an angle piece part and an injection pipe joint, and also includes an electric heating sheet. An upper part of the outer wall of the angle piece part is provided with a heating groove, the heating groove is arranged longitudinally along the length direction of the angle piece part, and the electric heating sheet is laid in the heating groove.

[0009] Furthermore, a top part of the inner side of the angle piece part is set as a flat top part, a bottom opening of the injection pipe joint is arranged on a bottom surface of the flat top part, and the two heating grooves are respectively symmetrically arranged at opposite positions at two ends of a bottom edge of the flat top part.

[0010] Furthermore, the flat top part is provided with an inwardly inclined chamfer part at an end face position of the angle piece part.

[0011] Furthermore, a bending preset groove is also opened at a top part of a bottom surface of the heating groove, and the bending preset groove is arranged longitudinally along the bottom surface of the heating groove.

[0012] Furthermore, it also includes a pre-buried cable. A bottom end of the pre-buried cable is connected to the electric heating sheet, a top end of the pre-buried cable extends out of an outer wall of the injection pipe joint and is connected to an equipment electric control box; a main body of the pre-buried cable is pre-buried in a pipe wall of the injection pipe joint.

[0013] Furthermore, the angle piece part and the injection pipe joint are injection-molded by using a PVC material, and a softening temperature of the PVC material is controlled at 70°C to 80°C.

[0014] Furthermore, a sheet-shaped temperature measuring sensor is arranged between the electric heating sheet and a bottom surface of the heating groove, and the temperature measuring sensor is connected to the equipment electric control box through the pre-buried cable.

[0015] The present invention also discloses a method for discharging residual glue, which is used for discharging residual resin glue in a glue injection pipe seat of a blade vacuum glue injection system. The upper part of the outer wall of the angle piece part of the glue injection pipe seat is heated by using the electric heating sheet to soften the angle piece part, and then the angle piece part is attached to a blade laying structure, so as to squeeze the residual resin glue into a blade fiber layer.

[0016] Furthermore, after the glue injection is finished and during the curing process when the mold is heated, the electric heating sheet is powered on to start working, and a heating temperature of the electric heating sheet is controlled within a range of 75°C to 80°C.

[0017] Compared with the prior art, the beneficial technical effects of the present invention:

[0018] The glue injection tube socket with the function of discharging residual glue of the present invention, by adding a heating groove and a heating sheet, first, the heating groove is opened at the upper part of the outer wall of the corner piece part, which can form the weakest bending part, and the heating sheet is installed nearby, so that the heat can directly act on the weak bending part, making the corner piece part collapse and deform, and squeezing out the residual resin glue liquid in the inner cavity. The heating groove is set to be tangent to the root of the injection tube joint to avoid affecting the injection tube joint and causing additional glue leakage points. The glue injection tube socket with the function of discharging residual glue of the present invention uses the electric heating method to separately heat the corner piece part of the glue injection tube socket, so that the corner piece part is completely opened, and then the residual glue liquid in the tube is more completely discharged.

[0019] In addition, by setting the inner top of the corner piece part as a flat top, when the two side plates of the corner piece part are folded up and collapsed along the heating groove, the inner wall of the side plate and the bottom surface of the flat top will be close to a plane, reducing the residual amount during the extrusion and glue discharging process. By adding a chamfer part at the end face position of the flat top of the corner piece part, the adjacent flow channel parts can also reduce the collapse height, and the residual resin glue liquid amount between the adjacent flow channel parts and the end face of the corner piece part can be reduced. By setting a bending preset groove at the top and bottom of the heating groove, the two side plates of the corner piece part can be folded up and collapsed along the bending preset groove in the heating groove, and the folding line position is higher, so that the inner wall of the folded side plate and the bottom surface of the flat top will be closer to a plane. Using the embedded cable in the pipe wall of the injection tube joint to control the operation of the heating sheet, compared with the exposed cable method, it is convenient for sealing and can avoid the situation of vacuum leakage. By adding the temperature measuring sensor between the heating sheet and the bottom surface of the heating groove, the heating temperature can be controlled in real time to avoid the situation that the vacuum bag film is burned due to high temperature.

[0020] The method for discharging residual glue of the present invention, by using electric heating to assist in softening the corner piece part of the glue injection tube socket, can respond quickly compared with simply relying on the increase of the curing temperature, and can quickly discharge the residual resin glue. Reasonably controlling the heating temperature of the heating sheet can ensure that no safety accident will occur during the rapid deformation and collapse of the corner piece part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings.

[0022] Figure 1 It is a three-dimensional structure schematic diagram of the glue injection tube socket with the function of discharging residual glue of the present invention;

[0023] Figure 2 It is another three-dimensional structure schematic diagram of the glue injection tube socket with the function of discharging residual glue of the present invention;

[0024] Figure 3 It is a front view structure schematic diagram of the glue injection tube socket with the function of discharging residual glue of the present invention;

[0025] Figure 4 It is a right view structure schematic diagram of the glue injection tube socket with the function of discharging residual glue of the present invention;

[0026] Figure 5 This is a schematic cross-sectional structure diagram of the root of the glue injection tube seat for the residue glue discharging function of the present invention.

[0027] Explanation of the reference numerals: 1, corner piece part; 101, heating groove; 102, bending preset groove; 103, flat top part; 104, chamfer part; 2, injection tube joint; 201, insertion part; 202, bottom opening; 3, electric heating sheet; 4, embedded cable. Detailed implementation manners

[0028] The core of the present invention is to provide a glue injection tube seat with a residue glue discharging function and a residue glue discharging method, which uses the electric heating method to separately heat the corner piece part of the glue injection tube seat, so that the corner piece part is completely expanded, and then the residual glue liquid in the tube is more completely discharged.

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] Referring to the accompanying drawings, Figure 1 This is a schematic three-dimensional structure diagram of the glue injection tube seat for the residue glue discharging function of the present invention; Figure 2 This is a schematic three-dimensional structure diagram of the glue injection tube seat for the residue glue discharging function of the present invention from another angle; Figure 3 This is a schematic front view structure diagram of the glue injection tube seat for the residue glue discharging function of the present invention; Figure 4 This is a schematic right view structure diagram of the glue injection tube seat for the residue glue discharging function of the present invention; Figure 5 This is a schematic cross-sectional structure diagram of the root of the glue injection tube seat for the residue glue discharging function of the present invention.

[0032] In a specific implementation manner, as Figures 1 to 5As shown in the figure, the glue injection pipe seat with the function of discharging residual glue in the present invention is used in the vacuum glue injection system of wind turbine blades, and includes an angle piece part 1 and an injection pipe joint 2. Regarding the structural composition and working principle of the vacuum system of wind turbine blades, the applicant's prior application patent CN118046593A has a relatively detailed description, which will not be elaborated here. Moreover, the glue injection pipe seat in the present application is the same as the prior art and is also used to introduce resin glue. The angle piece part 1 is also in the shape of an angle steel and both ends can be fitted and connected to the runner part. The injection pipe joint 2 is vertically connected to the middle position of the back of the angle piece part 1. The insertion part 201 at the top of the injection pipe joint 2 is connected to the output pipe group of the glue injection machine through a steel wire hose.

[0033] It should be added that in the prior art, during the process of pouring resin glue, because the thickness of the angle piece part 1 of the glue injection pipe seat is relatively large compared to the wall thickness of the runner part, it is ensured that there will be no collapse and blockage during the initial glue injection process, ensuring the smoothness of the glue injection. However, after the resin glue injection is completed, at the initial stage of heating up to the curing temperature of the blade, because the thickness of the angle piece part 1 is large and there is an overlapping part with the runner part, during the heating and curing process, the structural strength of the angle piece part 1 is large and it cannot collapse at the blade curing temperature of 65°C to 70°C.

[0034] The important improvement of the present invention compared with the prior art is as Figures 1 to 5 As shown in the figure, the glue injection pipe seat with the function of discharging residual glue in the present invention further includes a heating element 3. An upper part of the outer wall of the angle piece part 1 is provided with a heating groove 101. The heating groove 101 is arranged along the length direction of the angle piece part 1 and is tangent to the root of the injection pipe joint 2. The heating element 3 is laid in the heating groove 101.

[0035] By adding the heating groove 101 and the heating element 3, first, the heating groove 101 is opened on the upper part of the outer wall of the angle piece part 1, which can form the weakest bending part, and the heating element 3 is installed nearby, which can directly act on the weak bending part with heat, causing the angle piece part 1 to collapse and deform, squeezing out the residual resin glue in the inner cavity. Setting the heating groove 101 to be tangent to the root of the injection pipe joint 2 can avoid affecting the injection pipe joint 2 and causing additional glue leakage points. The glue injection pipe seat with the function of discharging residual glue in the present invention uses the electric heating method to separately heat the angle piece part of the glue injection pipe seat, so that the angle piece part is completely opened, and then the residual glue in the pipe is more completely discharged.

[0036] In a specific embodiment of the present invention, as Figures 1 to 4 shown, the inner top of the angle piece part 1 is set as a flat top 103. The flat top 103 can be solid or hollow. The bottom opening 202 of the injection pipe joint 2 is opened on the bottom surface of the flat top 103. Two heating grooves 101 are symmetrically arranged at opposite positions at both ends of the bottom edge of the flat top 103 respectively.

[0037] Specifically, as Figures 1 to 4As shown, the flat top 103 is provided with an inwardly inclined chamfered portion 104 at the end face position of the corner piece portion 1.

[0038] By setting the inner top of the corner piece portion 1 as the flat top 103, when the two side plates of the corner piece portion 1 are folded and collapsed upward along the heating groove 101, the inner wall of the side plate and the bottom surface of the flat top 103 will approach a plane, reducing the residue during the extrusion and degumming process. By adding the chamfered portion 104 at the end face position of the flat top 103 of the corner piece portion 1, the collapse height of the adjacent flow channel members can also be reduced, and the residual resin glue amount between the adjacent flow channel members and the end face of the corner piece portion 1 can be reduced.

[0039] In a specific embodiment of the present invention, as Figure 2 and Figure 5 shown, a bending preset groove 102 is further opened at the top of the bottom surface of the heating groove 101, and the bending preset groove 102 is arranged along the entire length of the bottom surface of the heating groove 101.

[0040] Specifically, the bending preset groove 102 is an arc groove.

[0041] By setting the bending preset groove 102 at the top of the bottom surface of the heating groove 101, the two side plates of the corner piece portion 1 can be folded and collapsed upward along the bending preset groove 102 in the heating groove 101, and the folding line position is higher, making the inner wall of the folded side plate and the bottom surface of the flat top 103 closer to a plane.

[0042] In a specific embodiment of the present invention, as Figures 1 to 5 shown, the glue injection pipe seat with the function of discharging residual glue of the present invention further includes a pre-buried cable 4. The bottom end of the pre-buried cable 4 is connected to the electric heating sheet 3, and the two electric heating sheets 3 are connected in parallel. The top end of the pre-buried cable 4 protrudes out of the outer wall of the injection pipe joint 2 and is connected to the equipment electric control box, controllably providing electric energy to the electric heating sheet 3. The main body of the pre-buried cable 4 is pre-buried in the pipe wall of the injection pipe joint 2, that is, the pre-buried cable 4 is clamped in the injection mold before injection molding the glue injection pipe seat.

[0043] Specifically, a sheet-shaped temperature sensing is arranged between the electric heating sheet 3 and the bottom surface of the heating groove 101, and the temperature sensing is connected to the equipment electric control box through the pre-buried cable 4. A temperature control instrument for controlling the operation of the electric heating sheet 3 is arranged in the electric control box.

[0044] Using the pre-buried cable 4 pre-buried in the pipe wall of the injection pipe joint 2 to control the operation of the electric heating sheet 3 is more convenient for sealing compared to the exposed cable method, avoiding the occurrence of vacuum leakage. By adding the temperature sensing between the electric heating sheet 3 and the bottom surface of the heating groove 101, the heating temperature can be controlled in real time, avoiding the situation where the vacuum bag film is burned due to high temperature.

[0045] In a specific embodiment of the present invention, the corner piece portion 1 and the injection pipe joint 2 are injection molded from PVC material, and the softening temperature of the PVC material is controlled at 70°C to 80°C. The adjustment of the softening temperature of the PVC material is determined by the filler components and content incorporated into the PVC.

[0046] Working principle of the glue injection pipe seat with the function of discharging residual glue in the present invention: After the glue injection process is completed, the wind power blade mold is heated to the curing temperature of about 70°C and kept warm to start curing. During the heating process, when the runner part made of PVC material in the shape of an angle steel is heated to the softening temperature, the two corner side plates of the runner part diverge outwards and the middle part collapses downward, and the runner part is flattened. The residual resin glue in the channel is extruded and continuously injected into the blade ply structure, avoiding residue and reducing the formation of high-density resin glue areas. After molding, there will no longer be white marks on the blade visually. After observing that the runner part has collapsed and flattened, the corner piece portion 1 with a relatively large thickness often does not collapse. Therefore, the electric heating sheet 3 is controlled to be energized and start heating, so that the bottom surface of the heating groove 101 starts to heat up. The heating temperature of the electric heating sheet 3 is controlled not to exceed 80°C. The PVC material on the bottom surface of the heating groove 101 is softened first, so that the two side plates of the corner piece portion 1 are folded upwards along the bending preset groove 102 in the heating groove 101 and collapse, making the inner wall of the folded side plate and the bottom surface of the flat top 103 closer to a plane. Because the mold transfers temperature to the end of the adjacent runner part, the end of the runner part will also collapse downward along the chamfer portion 104. The residual glue liquid in the cavity of the corner piece portion 1 is extruded and injected into the nearby blade ply structure.

[0047] In summary, for the glue injection pipe seat with the function of discharging residual glue of the present invention, by adding the heating groove 101 and the electric heating sheet 3, firstly, the heating groove 101 is opened at the upper part of the outer wall of the angle piece part 1, which can form the weakest bending part, and the electric heating sheet 3 is installed nearby, so that the heat can directly act on the weak bending part, making the angle piece part 1 collapse and deform, and squeezing out the residual resin glue in the inner cavity. The heating groove 101 is tangent to the root of the injection pipe joint 2 to avoid affecting the injection pipe joint 2 and causing additional glue leakage points. The glue injection pipe seat with the function of discharging residual glue of the present invention uses the electric heating method to separately heat the angle piece part of the glue injection pipe seat, so that the angle piece part is completely opened, and then the residual glue in the pipe is discharged more completely. In addition, by setting the inner top of the angle piece part 1 as the flat top 103, when the two side plates of the angle piece part 1 are turned up and collapsed along the heating groove 101, the inner wall of the side plate and the bottom surface of the flat top 103 will be close to the plane, reducing the residual amount during the extrusion and glue discharging process. By adding the chamfer part 104 at the end face position of the flat top 103 of the angle piece part 1, the adjacent flow channel parts can also reduce the collapse height, and the residual resin glue amount between the adjacent flow channel parts and the end face of the angle piece part 1 can be reduced. By setting the bending preset groove 102 at the bottom and top of the heating groove 101, the two side plates of the angle piece part 1 can be turned up and collapsed along the bending preset groove 102 in the heating groove 101, and the folding line position is higher, so that the inner wall of the turned-up side plate and the bottom surface of the flat top 103 will be closer to the plane. The electric heating sheet 3 is controlled to work by the embedded cable 4 buried in the pipe wall of the injection pipe joint 2. Compared with the exposed cable method, it is convenient for sealing and avoids the situation of vacuum leakage. By adding the temperature measuring sensor between the electric heating sheet 3 and the bottom surface of the heating groove 101, the heating temperature can be controlled in real time, avoiding the situation that the vacuum bag film is burned due to high temperature.

[0048] The present invention also discloses a method for discharging residual glue, which is used to discharge the residual resin glue in the glue injection pipe seat of the blade vacuum injection system. The outer wall upper part of the angle piece part of the glue injection pipe seat is heated by the electric heating sheet to soften the angle piece part, and then it adheres to the blade laying structure, and the residual resin glue is squeezed into the blade fiber layer.

[0049] Specifically, after the glue injection is completed and the blade mold is heated to start the curing process, the electric heating sheet is powered on to start working, and the heating temperature of the electric heating sheet is controlled within the range of 75°C to 80°C.

[0050] By using electric heating to assist in softening the angle piece part of the glue injection pipe seat, compared with simply relying on the increase of the curing temperature, it can respond quickly and quickly discharge the residual resin glue. Reasonably controlling the heating temperature of the electric heating sheet can ensure that no safety accidents occur during the rapid deformation and collapse of the angle piece part.

[0051] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For related parts, reference can be made to the description in the method section.

[0052] The above-described embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A glue injection pipe seat with a function of discharging residual glue, which is used in the vacuum glue injection system of blades, includes an angle piece part (1) and an injection pipe joint (2), and is characterized in that, It also includes an electric heating plate (3), a heating groove (101) is provided on the upper part of the outer wall of the corner plate portion (1), the heating groove (101) is arranged along the length direction of the corner plate portion (1), and the electric heating plate (3) is laid in the heating groove (101).

2. The glue injection pipe seat with the function of discharging redundant glue according to claim 1, characterized in that: The inner top of the corner piece (1) is set as a flat top (103), the bottom opening (202) of the injection pipe joint (2) is opened on the bottom surface of the flat top (103), and the two heating grooves (101) are symmetrically arranged at opposite positions at both ends of the bottom edge of the flat top (103).

3. The glue injection pipe seat with the function of discharging residual glue according to claim 2, characterized in that: The flat top portion (103) is provided with an inwardly inclined chamfered portion (104) at the end surface of the corner piece portion (1).

4. The glue injection tube seat with the function of discharging residual glue according to claim 1, characterized in that: A bending preset groove (102) is also provided on the top of the bottom surface of the heating groove (101), and the bending preset groove (102) is arranged along the entire length of the bottom surface of the heating groove (101).

5. The glue injection tube seat with the function of discharging excess glue according to claim 1, characterized in that: It also includes a pre-buried cable (4), the bottom end of the pre-buried cable (4) is connected to the electric heating plate (3), the top end of the pre-buried cable (4) protrudes from the outer wall of the injection pipe joint (2) and is connected to the equipment electric control box; the main body of the pre-buried cable (4) is pre-buried in the pipe wall of the injection pipe joint (2).

6. The glue injection pipe seat with the function of discharging redundant glue according to claim 1, characterized in that, The corner piece portion (1) and the injection pipe joint (2) are injection-molded using PVC material, and the softening temperature of the PVC material is controlled at 70° C. to 80° C.

7. The glue injection tube seat with the function of discharging redundant glue according to claim 1, wherein A sheet-shaped temperature sensor is provided between the electric heating plate (3) and the bottom surface of the heating tank (101), and the temperature sensor is connected to the equipment electric control box via a pre-buried cable (4).

8. A method for removing residual glue, which is used to remove the residual resin glue in the glue injection pipe seat of the blade vacuum glue injection system, is characterized in that: The upper part of the outer wall of the corner piece of the glue injection pipe seat is heated by an electric heater to soften the corner piece, and then attached to the blade ply structure to squeeze the residual resin glue into the blade fiber layer.

9. The method for discharging surplus glue according to claim 8, characterized in that: After the injection is completed, the mold is heated and the curing process begins. The heater is powered on and starts working. The heating temperature of the heater is controlled within the range of 75℃ to 80℃.

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