Self-cleaning glue injection head for HP-RTM double-component glue injection equipment

Abstract

The utility model discloses a self-cleaning glue injection head for HP-RTM double-component glue injection equipment, which comprises a glue injection head main body, a material injection head is arranged at the bottom of the glue injection head main body, two material cavities are arranged in the glue injection head main body, and the two material cavities are both connected with the material injection head; a material body injection channel, a cleaning agent injection channel and a compressed air injection channel which are communicated with the material cavity are formed in the inner wall of the glue injection head main body; a first control valve is arranged on the glue injection head main body corresponding to the material body injection channel; a second control valve is arranged on the head glue injection main body corresponding to the cleaning agent injection channel; a third control valve is arranged on the head glue injection main body corresponding to the compressed air injection channel; the first control valve is closed, and the second control valve and the third control valve are sequentially opened, so that cleaning liquid in the cleaning agent injection channel and compressed air in the compressed air injection channel enter the material cavity and are discharged through the discharge port, and then self-cleaning of the glue injection head can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of HP-RTM forming process, concretely relates to a self -cleaning glue injection head for HP-RTM two components glue injection equipment. BACKGROUND

[0002] In the RTM derived process, HP-RTM is applied in many fields such as aerospace because of its mass production, high quality, low cost and short cycle. Among them, the glue injection head is one of the key components of the glue injection system. In the embodiment, the glue injection process of the glue injection head of the HP-RTM glue injection equipment is mainly aimed at. The mixing of the material of resin and curing agent and the injection into the mold are usually through two material cavities aiming at the A and B components of the HP-RTM system, that is, the mixing of the material of resin and curing agent and the injection into the mold. The resin is conveyed to one material cavity by pumping equipment, and the curing agent is conveyed to the other material cavity by pumping equipment, and then discharged to the mold through the injection head.

[0003] In the existing HP-RTM glue injection process, the resin and the curing agent are mixed in the glue injection head. If the glue injection head is stopped for glue injection, the glue remaining in the glue injection head will be cured. The existing high-pressure glue injection head is mainly divided into two types of integral type glue injection head and modular type glue injection head. The integral type glue injection head and the modular type glue injection head basically have no cleaning system, and the modular type glue injection head needs to be disassembled and cleaned to be completely cleaned. However, after cleaning, there will still be a blockage. Therefore, during the batch glue injection process, the production efficiency is reduced.

[0004] Therefore, in the existing HP-RTM glue injection process, there is a problem of low production efficiency caused by the lack of cleaning measures for the glue injection head or the need to disassemble and clean the glue injection head. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a self-cleaning glue injection head for HP-RTM two-component glue injection equipment to solve the technical problem of low production efficiency caused by the lack of cleaning measures for the glue injection head or the need to disassemble and clean the glue injection head in the existing HP-RTM glue injection process.

[0006] To solve the above technical problems, the utility model provides the following technical scheme:

[0007] A self-cleaning glue injection head for HP-RTM two-component glue injection equipment, comprising a glue injection head main body, a material injection head is arranged at the bottom of the glue injection head main body, an outlet is formed at the end of the material injection head away from the glue injection head main body, two material cavities are arranged in the glue injection head main body, and the two material cavities are connected to the material injection head through an inner pipeline and communicate with the outlet.

[0008] A material body injection channel, a cleaning agent injection channel and a compressed air injection channel are arranged in the inner wall of the glue injection head body corresponding to each material cavity;

[0009] A first control valve is arranged on the glue injection head body corresponding to the material body injection channel, for controlling the material body in the material body injection channel to enter the material cavity;

[0010] A second control valve is arranged on the glue injection head body corresponding to the cleaning agent injection channel, for controlling the cleaning liquid in the cleaning agent injection channel to enter the material cavity;

[0011] A third control valve is arranged on the glue injection head body corresponding to the compressed air injection channel, for controlling the compressed air in the compressed air injection channel to enter the material cavity;

[0012] Wherein, by closing the first control valve, sequentially opening the second control valve and the third control valve, the cleaning liquid in the cleaning agent injection channel and the compressed air in the compressed air injection channel enter the material cavity and are discharged through the discharge port.

[0013] As a preferred scheme of the utility model, the opening of the material body injection channel on the surface of the glue injection head body is screw connected with a feeding seat, first and second cavities are arranged in the feeding seat from bottom to top, the first cavity is connected with the material cavity, a feeding adapter is arranged on the glue injection head body corresponding to the first cavity, and a discharge adapter is arranged on the glue injection head body corresponding to the second cavity.

[0014] The first control valve is arranged on the top of the feeding seat, and is used for controlling the communication between the first cavity and the material cavity or controlling the communication between the first cavity and the second cavity.

[0015] As a preferred scheme of the utility model, the first control valve has a valve rod and a driving part, the valve rod passes through the second cavity and the first cavity and enters the material cavity.

[0016] Wherein, the driving part drives the upward movement of the valve rod to close the connection between the first cavity and the material cavity by the end of the valve rod, and closes the connection between the first cavity and the material cavity.

[0017] Or the driving part drives the downward movement of the valve rod to enter the material cavity by the end of the valve rod, and the first cavity is communicated with the material cavity; the rod body of the valve rod closes the communication between the first cavity and the second cavity.

[0018] As a preferred scheme of the utility model, the inner pipeline comprises a horizontal section and an inclined section, one end of the horizontal section is connected with the material cavity, the other end of the horizontal section is connected with the inclined section, and one end of the inclined section away from the horizontal section is connected with the material injection head.

[0019] As a preferred scheme of the utility model, the material injection head comprises a spiral pipeline structure, the pitch range of the spiral pipeline structure is 9.17-13.75 mm, and the axial length range of the spiral pipeline structure is 35-45 mm.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model discloses a cleaning device for material injection head, which comprises a material cavity, a material injection head and an inner pipeline, wherein the material cavity is connected with the material injection head through the inner pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative labor.

[0023] Figure 1 It is the whole structure schematic diagram of the utility model embodiment;

[0024] Figure 2 It is the main view cut structure schematic diagram of the utility model embodiment;

[0025] Figure 3 It is the material injection head structure schematic diagram of the utility model embodiment;

[0026] Figure 4 It is the floating degree broken line graph of the component at different monitoring points arranged on the inner pipeline of the utility model embodiment;

[0027] Figure 5 It is the different material injection head axial length result table and broken line graph of the injection glue mixing simulation of the two symmetrical inner pipelines of the utility model embodiment;

[0028] Figure 6 It is the injection glue mixing simulation data table of the two symmetrical inner pipelines of the utility model embodiment under the spiral pipeline structure of the material injection head.

[0029] Figure 7 Structure diagram of the injection head with spiral pipeline structure in the embodiment of the present application.

[0030] The reference numerals in the drawings represent the following respectively:

[0031] 1 - injection head main body; 2 - injection head; 3 - discharge port; 4 - material cavity; 5 - inner pipeline; 6 - material body injection channel; 7 - cleaning agent injection channel; 8 - compressed air injection channel; 9 - first control valve; 10 - second control valve; 11 - third control valve; 12 - feeding seat;

[0032] 51 - horizontal section; 52 - inclined section;

[0033] 91 - valve stem; 92 - driving part;

[0034] 121 - first cavity; 122 - second cavity; 123 - feeding adapter; 124 - discharging adapter. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] As shown in Figure 1 The present application provides a self-cleaning injection head for HP-RTM two-component injection equipment, which comprises an injection head main body 1, the bottom of the injection head main body 1 is provided with an injection head 2, the end of the injection head 2 away from the injection head main body 1 forms a discharge port 3, the inside of the injection head main body 1 is provided with two material cavities 4, the two material cavities 4 are connected to the injection head 2 through an inner pipeline 5 and communicate with the discharge port 3.

[0037] A material body injection channel 6, a cleaning agent injection channel 7 and a compressed air injection channel 8 are arranged in the inner wall of the injection head main body 1 corresponding to each material cavity 4.

[0038] A first control valve 9 is arranged on the injection head main body 1 corresponding to the material body injection channel 6, which is used to control the material body in the material body injection channel 6 to enter the material cavity 4.

[0039] A second control valve 10 is arranged on the injection head main body 1 corresponding to the cleaning agent injection channel 7, which is used to control the cleaning liquid in the cleaning agent injection channel 7 to enter the material cavity 4.

[0040] A third control valve 11 is arranged on the injection head body 1 corresponding to the compressed air injection channel 8, for controlling the compressed air in the compressed air injection channel 8 to enter the material cavity 4.

[0041] By closing the first control valve 9, sequentially opening the second control valve 10 and the third control valve 11, the cleaning agent in the cleaning agent injection channel 7 and the compressed air in the compressed air injection channel 8 enter the material cavity 4 and are discharged through the discharge port 3.

[0042] Therefore, in the embodiment, a self-cleaning injection head is provided. After the injection action of the injection head body 1 and the main material head 2 is completed, the first control valve 9 closes the material injection channel 6, the third control valve 11 closes the compressed air injection channel 8, and the second control valve 10 opens the cleaning agent injection channel 7, specifically a DOP environmentally friendly cleaning agent, which then enters the inner channel 5 and is sprayed out through the material injection head 2.

[0043] Then the second control valve 10 closes the cleaning agent injection channel 7, and then the third control valve 11 opens the compressed air injection channel 8, and the compressed air enters the material cavity 4 to discharge the DOP cleaning agent, resin and curing agent residues in the material cavity 4 through the material injection head 2. The third control valve 11 closes the compressed air injection channel 8, and the second control valve 10 closes the cleaning agent injection channel 7, thereby realizing self-cleaning of the pipelines in the injection head body 1 and the material injection head 2.

[0044] In the embodiment, the cleaning agent injection channel 7 and the compressed air injection channel 8 are connected to an external cleaning agent supply device and a compressed air supply source through quick-release joints.

[0045] The material injection channel 6 is connected to a resin or curing agent supply device through a quick-release joint.

[0046] Of course, the injection head body 1 provided in the embodiment also includes a material circulation function of resin and curing agent when no injection action is performed, to avoid curing of the material in the injection head body 1.

[0047] Therefore, the material injection channel 6 is threadedly connected to a material inlet seat 12 on the surface of the injection head body 1. The material inlet seat 12 is internally provided with a first cavity 121 and a second cavity 122 from bottom to top. The first cavity 121 is connected to the material cavity 4, and the injection head body 1 corresponding to the first cavity 121 is provided with a material inlet adapter 123. The injection head body 1 corresponding to the second cavity 122 is provided with a material outlet adapter 124. The material inlet adapter 123 and the material outlet adapter 124 are connected to an external material supply device.

[0048] A first control valve 9 is arranged at the top of the feeding seat 12, and is used to control the communication between the first cavity 121 and the material cavity 4. When the glue injection head body 1 is in the glue injection state, the material (resin or curing agent) enters the material cavity 4 through the first cavity 121.

[0049] The communication between the first cavity 121 and the second cavity 122 is controlled, and when the glue injection head body 1 is in the glue material circulation state, the material enters the first cavity 121 through the feeding adapter 123, then enters the second cavity 122, and then is discharged through the discharging adapter 124.

[0050] In order to more clearly describe the working principle of the first control valve 9, the first control valve 9 in the embodiment has a valve rod 91 and a driving part 92. The valve rod 91 passes through the second cavity 122 and the first cavity 121 to enter the material cavity 4.

[0051] Further, the valve rod 91 in the embodiment is used to cooperate with the communication between the first cavity 121 and the second cavity 122, or the communication between the first cavity 121 and the material cavity 4. The specific structure includes a first rod segment, a second rod segment and an end head connected in sequence. The diameter of the second rod segment is smaller than that of the first rod segment, and the diameter of the end head is larger than that of the first rod segment. Figure 2 As shown from top to bottom.

[0052] Meanwhile, the diameter of the end head is larger than the diameter of the opening for the communication between the first cavity 121 and the material cavity 4, and the diameter of the second rod segment is smaller than the diameter of the opening for the communication between the first cavity 121 and the material cavity 4. When the end head enters the inside of the material cavity 4, the first rod segment closes the communication between the first cavity 121 and the second cavity 122, and the opening for the communication between the first cavity 121 and the material cavity 4 is located in the middle of the second rod segment.

[0053] When the end head is clamped or closed to the opening for the communication between the first cavity 121 and the material cavity 4, the second rod segment is located at the opening for the communication between the first cavity 121 and the second cavity 122.

[0054] The driving part 92 drives the upward movement of the valve rod 91 to close the connection between the first cavity 121 and the material cavity 4 by the end of the valve rod 91, and closes the connection between the first cavity 121 and the material cavity 4.

[0055] Further, the overall structures of the first control valve 9, the second control valve 10 and the third control valve 11 are the same, and all adopt the valve body structure driven by oil pressure to realize the opening and closing of the material injection channel 6, the cleaning agent injection channel 7 and the compressed air injection channel 8.

[0056] The driving part 92 drives the downward movement of the valve rod 91 to enter the material cavity 4 by the end of the valve rod 91, and the first cavity 121 communicates with the material cavity 4; the rod body of the valve rod 91 closes the communication between the first cavity 121 and the second cavity 122.

[0057] Further, the inner pipe 5 in the embodiment includes a horizontal section 51 and an inclined section 52, one end of the horizontal section 51 is connected to the material cavity 4, the other end of the horizontal section 51 is connected to the inclined section 52, and the end of the inclined section 52 far from the horizontal section 51 is connected to the injection head 2.

[0058] As shown in the figure, the plurality of inclined sections 52 are uniformly distributed at the circumferential positions of the top of the injection head 2, and further, the two adjacent inclined sections 52 form a "V" shape. During the process of the inclined section 52 entering the injection head 2, the discharging of the plurality of inclined sections 52 is directed to the axis of the injection head 2, so that the discharging of the plurality of inclined sections 52 collides at the axis of the injection head 2, thereby better mixing and not affecting the mixing and discharging efficiency of the injection head 2.

[0059] In the embodiment, in order to ensure the uniformity of the mixing of the two material cavities 4 (A, B components) into the injection head 2, each material cavity 4 is connected to the injection head 2 by two inner pipes 5. The connection positions of the four inner pipes 5 and the injection head 2 are uniformly distributed along the circumferential direction of the injection head 2, so that the A and B components entering the injection head 2 can be uniformly mixed.

[0060] Of course, in the embodiment, the injection head 2 is a straight pipe structure by default, and it is found that as the number of inner pipes 5 increases, the axial length of the injection head 2 needs to be increased to meet the uniform mixing degree of the A and B components, but there is an upper limit of the length.

[0061] As shown in the figure, the injection head 2 is connected to the material cavity 4 by two inner pipes 5, and the injection head 2 is connected to the material cavity 4 by two inner pipes 5. Figure 4 and Figure 5 As shown in the figure, the injection head 2 is connected to the material cavity 4 by two inner pipes 5, and the injection head 2 is connected to the material cavity 4 by two inner pipes 5.

[0062] Among them, the influencing factors of the flow channel design are:

[0063] As shown in the figure, the injection head 2 is connected to the material cavity 4 by two inner pipes 5, and the injection head 2 is connected to the material cavity 4 by two inner pipes 5. Figure 7 As shown in the figure, the injection head 2 is connected to the material cavity 4 by two inner pipes 5, and the injection head 2 is connected to the material cavity 4 by two inner pipes 5.

[0064] Figure 4 As shown in the figure, the injection head 2 is connected to the material cavity 4 by two inner pipes 5, and the injection head 2 is connected to the material cavity 4 by two inner pipes 5. Figure 5

[0065] ​​Wherein, the floating degree represents the maximum volume fraction of component B minus the minimum volume fraction of component B at the outlet cross section, the smaller the floating degree, the better the mixing uniformity, and vice versa. The Y factor has the greatest impact on the mixing uniformity, and the specific value is as shown in Figure 7 .

[0066] As a result: in the case that the floating degree between the maximum and minimum values of the mixing uniformity of the material tends to be stable, the length range of the injection head 2 is preferably 35-45 mm.

[0067] Y is from 5 mm to 45 mm, the mixing uniformity is better and better, although increasing the axial length of the injection head 2 can improve the mixing degree of the A and B component materials, but the larger Y will result in too large volume of the injection head, which will cause great inconvenience. Therefore, under the premise of not changing the length of 45 mm, the flow channel structure is optimized to improve the mixing uniformity.

[0068] Based on this, a spiral pipe structure is proposed, the flow channel diameter of the spiral pipe structure is still 3 mm, and the variables are the number of spiral turns and the pitch, as shown in Figure 6 and Figure 7 .

[0069] The injection head 2 in the embodiment can be provided with a spiral pipe structure, and the pitch of the spiral pipe structure is in the range of 9.17-13.75 mm.

[0070] As shown in Figure 5 , Figure 6 and Figure 7 , using a spiral structure can improve the mixing uniformity of the materials, and under the limitation of the pipe diameter of the spiral pipe structure and the preferred length range of the injection head 2, when the pitch is 13.75 mm and the number of turns is 3, the optimal mixing uniformity can be achieved, and the outlet pressure of the injection head 2 changes little.

[0071] The embodiment mainly aims at the mixing and conveying of A and B component materials, i.e. resin and curing agent, and provides a specific embodiment of the injection head 2, which aims to avoid the adhesion of the materials in the injection head 2 and easily form a cured adhesive film on the inner wall surface of the injection head 2. Before the above cleaning process using high-pressure gas, the adhesive film on the inner wall of the injection head 2 can be removed.

[0072] In the embodiment, in order to ensure the uniformity of the mixing of the two material cavities 4 (A and B components) into the injection head 2, each material cavity 4 is connected to the injection head 2 through two inner pipes 5. The connection of the four inner pipes 5 to the injection head 2 is uniformly distributed along the circumference of the injection head 2, so that the A and B components entering the injection head 2 can be mixed uniformly.

[0073] Supplementarily, the driving part 92 is specifically a hydraulic cylinder or a pneumatic cylinder.

[0074] The above examples are only exemplary embodiments of the present application, and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and the modification or equivalent replacement is also regarded as falling within the protection scope of the present application.

Claims

1. A self-cleaning dispensing head for an HP-RTM two-component dispensing equipment, characterized in that, The device includes a glue injection head body (1), a glue injection head (2) is provided at the bottom of the glue injection head body (1), and a discharge port (3) is formed at the end of the glue injection head (2) away from the glue injection head body (1). The glue injection head body (1) has two material chambers (4) inside, and both material chambers (4) are connected to the glue injection head (2) through an inner pipe (5) and are connected to the discharge port (3). In the inner wall of the dispensing head body (1) corresponding to each of the material chambers (4), there are material injection channels (6), cleaning agent injection channels (7) and compressed air injection channels (8) that connect the material chambers (4). A first control valve (9) is provided on the dispensing head body (1) corresponding to the material injection channel (6) to control the material in the material injection channel (6) to enter the material cavity (4). A second control valve (10) is provided on the dispensing head body (1) corresponding to the cleaning agent injection channel (7) to control the cleaning liquid in the cleaning agent injection channel (7) to enter the material chamber (4). A third control valve (11) is provided on the dispensing head body (1) corresponding to the compressed air injection channel (8) to control the compressed air in the compressed air injection channel (8) to enter the material chamber (4). In this process, by closing the first control valve (9), the second control valve (10) and the third control valve (11) are opened in sequence, so that the cleaning liquid in the cleaning agent injection channel (7) and the compressed air in the compressed air injection channel (8) enter the material chamber (4) and are discharged through the discharge port (3).

2. The self-cleaning dispensing head for an HP-RTM two-component dispensing equipment according to claim 1, characterized in that, The material injection channel (6) is connected to the feed seat (12) by an open thread on the surface of the glue injection head body (1). The feed seat (12) is provided with a first cavity (121) and a second cavity (122) from bottom to top. The first cavity (121) is connected to the material cavity (4). The glue injection head body (1) corresponding to the first cavity (121) is provided with a feed adapter (123). The glue injection head body (1) corresponding to the second cavity (122) is provided with a discharge adapter (124). The first control valve (9) is provided on the top of the feed seat (12). The first control valve (9) is used to control the communication between the first cavity (121) and the material cavity (4), or to control the communication between the first cavity (121) and the second cavity (122).

3. The self-cleaning dispensing head for an HP-RTM two-component dispensing equipment according to claim 2, characterized in that, The first control valve (9) has a valve stem (91) and a drive part (92), the valve stem (91) passes through the second cavity (122) and the first cavity (121) to enter the material cavity (4); The drive unit (92) drives the valve stem (91) to move upward to close the connection between the first cavity (121) and the material cavity (4) at the end of the valve stem (91), thereby closing the connection between the first cavity (121) and the material cavity (4). Alternatively, the drive unit (92) drives the valve stem (91) to move downward to the end of the valve stem (91) and enters the material chamber (4), and the first chamber (121) communicates with the material chamber (4); the rod of the valve stem (91) closes the communication between the first chamber (121) and the second chamber (122).

4. The self-cleaning dispensing head for an HP-RTM two-component dispensing equipment according to claim 1, characterized in that, The inner pipe (5) includes a horizontal section (51) and an inclined section (52). One end of the horizontal section (51) is connected to the material chamber (4), and the other end of the horizontal section (51) is connected to the inclined section (52). The end of the inclined section (52) away from the horizontal section (51) is connected to the injection head (2).

5. A self-cleaning dispensing head for an HP-RTM two-component dispensing equipment according to claim 4, characterized in that, The injection head (2) includes a spiral pipe structure with a pitch range of 9.17 to 13.75 mm and an axial length range of 35 to 45 mm.

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