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

Abstract

The invention discloses a self-cleaning glue injection head for HP-RTM double-component glue injection equipment. The self-cleaning glue injection head comprises a glue injection head body, a glue injection head is arranged at the bottom of the glue injection head body, two material cavities are formed in the glue injection head body, and the two material cavities are both connected with the glue 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 invention relates to the field of HP-RTM forming technology, and in particular to a self-cleaning glue injection head for HP-RTM two-component glue injection equipment. Background Art

[0002] Among RTM-derived processes, HP-RTM is used in numerous fields, including aerospace, due to its high-volume, high-quality, low-cost, and short cycle times. The injection head, a key component of the injection system, is primarily targeted in this embodiment. The injection process of the HP-RTM injection head typically involves mixing and injecting the A and B components of the HP-RTM system, namely the resin and curing agent, into the mold through two chambers. The resin is pumped into one chamber, and the curing agent is pumped into the other chamber, where it is then discharged into the mold through the injection head.

[0003] In the existing HP-RTM injection process, resin and curing agent are mixed in the injection head. If the injection head is stopped for injection of the glue, the glue remaining in the injection head will solidify. The existing high-pressure injection heads are mainly divided into two types: integrated injection heads and modular injection heads. Among them, the integrated injection heads and modular injection heads basically have no cleaning system, and the modular injection head needs to be disassembled and cleaned before it can be cleaned. However, it may still be clogged after cleaning, so it will reduce production efficiency during the batch injection process.

[0004] Therefore, the existing HP-RTM glue injection process has the problem of low production efficiency due to the lack of cleaning measures for the glue injection head or the need to disassemble and clean it. Summary of the Invention

[0005] The purpose of the present invention is to provide a self-cleaning injection head for HP-RTM two-component injection equipment to solve the technical problem of low production efficiency in the existing HP-RTM injection process due to the lack of cleaning measures or the need for disassembly and cleaning of the injection head.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A self-cleaning glue injection head for HP-RTM two-component glue injection equipment, comprising a glue injection head body, a material injection head disposed at the bottom of the glue injection head body, an end of the material injection head away from the glue injection head body forming a discharge port, and two material chambers disposed within the glue injection head body, both of which are connected to the material injection head through internal pipes and communicate with the discharge port;

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

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

[0010] A second control valve is provided on the head glue injection 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 provided on the head glue injection 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] Among them, by closing the first control valve and opening the second control valve and the third control valve in sequence, 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 solution of the present invention, the material injection channel is located at an opening on the surface of the head injection body and is threadedly connected to a feed seat, and a first cavity and a second cavity are provided in the feed seat from bottom to top, the first cavity is connected to the material cavity, and a feed adapter is provided on the injection head body corresponding to the first cavity, and a discharge adapter is provided on the injection head body corresponding to the second cavity;

[0014] The first control valve is provided on the top of the feed seat, and the first control valve is used to control the communication between the first cavity and the material cavity, or to control the communication between the first cavity and the second cavity.

[0015] As a preferred solution of the present invention, the first control valve comprises a valve stem and a driving portion, and the valve stem passes through the second cavity and the first cavity and enters the material cavity;

[0016] The driving unit drives the valve stem to move upward to the end of the valve stem to close the connection between the first cavity and the material cavity, thereby closing the connection between the first cavity and the material cavity;

[0017] Or the driving part drives the valve stem to move downward to the end of the valve stem to enter the material cavity, and the first cavity is connected to the material cavity; the rod body of the valve stem closes the connection between the first cavity and the second cavity.

[0018] As a preferred solution of the present invention, the inner pipe includes a horizontal section and an inclined section, one end of the horizontal section is connected to the material cavity, the other end of the horizontal section is connected to the inclined section, and the end of the inclined section away from the horizontal section is connected to the injection head.

[0019] As a preferred solution of the present invention, the injection head includes a spiral pipe structure, the pitch of the spiral pipe structure ranges from 9.17 to 13.75 mm, and the axial length of the spiral pipe structure ranges from 35 to 45 mm.

[0020] As a preferred embodiment of the present invention, the injection head includes an inner tube body and an outer tube body sleeved on the inner tube body, wherein the outer tube body has at least a portion of the inner tube body protruding from the top of the outer tube body, a shaft is axially arranged inside the inner tube body, and a plurality of guide wings are evenly arranged on the end surface of the shaft extending to the inner bottom of the outer tube body, and the other ends of the plurality of guide wings are connected to the inner wall of the outer tube body;

[0021] An axial drive portion connected to the top of the shaft is provided inside the main body of the glue injection head. The axial drive portion is used to drive the shaft to move up and down along the axial direction of the shaft, thereby driving the outer tube body to move up and down relative to the inner tube body.

[0022] As a preferred solution of the present invention, the inner pipe is connected to the circumferential side wall of the inner tube body near the top; the top of the inner tube body is open and is installed with a sealing plug body, and the sealing plug body is fixedly sleeved on the shaft;

[0023] The shaft drives the sealing plug body to move downward until the communication between the inner pipe and the inner tube body is closed.

[0024] As a preferred solution of the present invention, the axial drive portion includes a sealed cavity provided in the main body of the injection head, a driving piston is provided in the sealed cavity, the driving piston is connected to the top of the shaft, and the driving piston divides the sealed cavity into an upper cavity and a lower cavity, the upper cavity is connected to one of the two material cavities through a first pipe, and the lower cavity is connected to the other material cavity through a second pipe;

[0025] The high-pressure gas alternately introduced into the two material chambers allows the high-pressure gas to enter the upper chamber through the first pipe or enter the lower chamber through the second pipe, thereby driving the shaft to move up and down.

[0026] As a preferred solution of the present invention, both the first pipeline and the second pipeline are provided with air pressure regulating valves.

[0027] As a preferred solution of the present invention, a spring is mounted on the outer wall of the outer tube body, the top of the spring is fixedly connected to the injection head body, and the bottom of the spring is fixedly connected to the outer wall of the outer tube body.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides a cleaning agent injection channel and a compressed air injection channel on the glue injection head body, and opens and closes the glue injection head body when no glue injection is performed by arranging corresponding control valves. Thus, the DOP cleaning agent and high-pressure compressed air can be injected to discharge the DOP cleaning agent and resin and curing agent residues in the material cavity through the injection head, thereby realizing self-cleaning of the glue injection head body and the pipelines in the injection head. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0031] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the cross-sectional structure of the main view panel according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the main structure of the glue injection head according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the main structure of the material injection head and the glue injection head according to an embodiment of the present invention;

[0035] Figure 5 A line graph showing the floating degree of components at different monitoring points set on the inner pipe according to an embodiment of the present invention;

[0036] Figure 6 The table and line graph of the results of different injection head axial lengths in the injection and mixing simulation of two symmetrically distributed inner pipes according to an embodiment of the present invention;

[0037] Figure 7 This is a table of simulation data for glue injection and mixing using two symmetrically distributed inner pipes under a spiral pipe structure of the injection head according to an embodiment of the present invention;

[0038] Figure 8 This is a schematic structural diagram of an injection head with a spiral pipe structure according to an embodiment of the present invention.

[0039] The numbers in the figure represent the following:

[0040] 1-Injection head body; 2-Injection head; 3-Discharge port; 4-Material cavity; 5-Inner pipe; 6-Material 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-Feed seat; 13-Air pressure regulating valve;

[0041] 21-inner tube; 22-outer tube; 23-shaft; 24-guide wing; 25-sealing plug; 26-axial drive unit; 27-spring;

[0042] 261 - sealed chamber; 262 - driving piston; 263 - upper chamber; 264 - lower chamber; 265 - first pipe; 266 - second pipe;

[0043] 51-horizontal section; 52-inclined section;

[0044] 91-valve stem; 92-driving part;

[0045] 121-first cavity; 122-second cavity; 123-feed adapter; 124-discharge adapter. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] like Figure 1 As shown, the present invention provides a self-cleaning glue injection head for HP-RTM two-component glue injection equipment, including a glue injection head body 1, an 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 injection head 2 away from the glue injection head body 1. Two material cavities 4 are provided inside the glue injection head body 1, and the two material cavities 4 are connected to the injection head 2 through an internal pipe 5 and are connected to the discharge port 3.

[0048] In the inner wall of the glue injection head body 1 corresponding to each material cavity 4 , a material injection channel 6 , a cleaning agent injection channel 7 and a compressed air injection channel 8 communicating with the material cavity 4 are provided.

[0049] A first control valve 9 is provided on the glue injection head body 1 corresponding to the material injection channel 6 , for controlling the material in the material injection channel 6 to enter the material cavity 4 .

[0050] A second control valve 10 is provided on the head glue injection body 1 corresponding to the cleaning agent injection channel 7 , for controlling the cleaning liquid in the cleaning agent injection channel 7 to enter the material cavity 4 .

[0051] A third control valve 11 is provided on the head glue injection 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 .

[0052] Among them, by closing the first control valve 9 and opening the second control valve 10 and the third control valve 11 in sequence, the cleaning liquid 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.

[0053] To this end, in this embodiment, a self-cleaning glue injection head is provided. Specifically, after the glue injection head body 1 and the main material head 2 complete the glue injection action, 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 DOP environmentally friendly cleaning agent, which then enters the inner channel 5 and is sprayed out through the glue injection head 2.

[0054] 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. The compressed air enters the material cavity 4, and the DOP cleaning agent and resin and curing agent residues in the material cavity 4 are discharged through the 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 injection head body 1 and the pipeline in the injection head 2.

[0055] In this 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 via quick-release connectors.

[0056] The material injection channel 6 is connected to the resin or curing agent supply equipment through a quick-release joint.

[0057] Of course, the glue injection head body 1 provided in this embodiment also includes realizing material circulation of the resin and the curing agent when the glue injection action is not being performed, so as to avoid solidification of the material in the glue injection head body 1 .

[0058] To this end, the opening of the material injection channel 6 on the surface of the head injection body 1 is threadedly connected to the feed seat 12. From bottom to top, the feed seat 12 is provided with a first cavity 121 and a second cavity 122. The first cavity 121 is connected to the material cavity 4. The injection head body 1 corresponding to the first cavity 121 is provided with a feed adapter 123, and the injection head body 1 corresponding to the second cavity 122 is provided with a discharge adapter 124. The feed adapter 123 and the discharge adapter 124 are connected to an external material feeding device.

[0059] A first control valve 9 is provided on the top of the feed seat 12 , and the first control valve 9 is used to control the communication between the first cavity 121 and the material cavity 4 . At this time, the glue injection head body 1 is in the glue injection action, and the material (resin or curing agent) enters the material cavity 4 through the first cavity 121 .

[0060] The communication between the first cavity 121 and the second cavity 122 is controlled. At this time, the glue injection head body 1 is in a glue circulation state, that is, the material enters the first cavity 121 through the feed adapter 123 and then enters the second cavity 122 and then is transferred out through the discharge adapter 124.

[0061] In order to make the working principle of the first control valve 9 clearer, the first control valve 9 in this embodiment has a valve stem 91 and a driving portion 92 , and the valve stem 91 passes through the second cavity 122 and the first cavity 121 into the material cavity 4 .

[0062] To further illustrate, the valve stem 91 in this embodiment is intended to facilitate 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. Its 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 Shown from top to bottom.

[0063] At the same time, the diameter of the end head is larger than the caliber of the communication between the first cavity 121 and the material cavity 4, and the diameter of the second rod segment is smaller than the caliber of the communication between the first cavity 121 and the material cavity 4. When the end head enters the interior 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 communication between the first cavity 121 and the material cavity 4 is located in the middle of the second rod segment.

[0064] When the end head is inserted into or closes the opening communicating between the first cavity 121 and the material cavity 4 , the second rod section is located at the opening communicating between the first cavity 121 and the second cavity 122 .

[0065] The driving portion 92 drives the valve stem 91 to move upward to the end of the valve stem 91 to close the connection between the first cavity 121 and the material cavity 4 , thereby closing the connection between the first cavity 121 and the material cavity 4 .

[0066] Furthermore, the first control valve 9 , the second control valve 10 and the third control valve 11 have the same overall structure, and all adopt a hydraulically driven valve body structure 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 .

[0067] The driving part 92 drives the valve stem 91 to move downward until the end of the valve stem 91 enters the material cavity 4, and the first cavity 121 is connected with the material cavity 4; the rod body of the valve stem 91 closes the connection between the first cavity 121 and the second cavity 122.

[0068] Furthermore, the inner pipe 5 in this 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 away from the horizontal section 51 is connected to the injection head 2.

[0069] With the connection between the inclined section 52 and the injection head 2 as the center, multiple inclined sections 52 are evenly distributed on the top circumferential position of the column head 2. Furthermore, two adjacent inclined sections 52 are in a "V" shape. In the process of the inclined section 52 entering the injection head 2, the discharge of multiple inclined sections 52 is toward the axis of the injection head 2. Therefore, the discharge of multiple inclined sections 52 collides at the axis position of the injection head 2, thereby enabling better mixing without affecting the mixing and discharge efficiency of the injection head 2.

[0070] In this embodiment, to ensure uniform mixing of the two material chambers 4 (components A and B) entering the injection head 2, each material chamber 4 is connected to the injection head 2 via two internal pipes 5. The connection points of the four internal pipes 5 with the injection head 2 are evenly distributed along the circumference of the injection head 2, ensuring that the A and B components entering the injection head 2 are evenly mixed.

[0071] Of course, in this embodiment, the injection head 2 is assumed to be a straight pipe structure, 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 component rubbers, but there is an upper limit to the length.

[0072] like Figure 5 As shown, for the simulation of the working state of the injection head 2 with two symmetrically distributed inner pipes 5, the flow channel diameter of the injection head 2 is selected: under the premise of using the regulating valve to control the flow rate unchanged, changing the flow channel diameter can change the flow rate and pressure. The flow channel diameter is selected according to one's own needs. In this article, the pipe diameter of the inner pipe and the injection head 2 is kept consistent, and the diameter is 3mm.

[0073] Among them, the factors affecting the flow channel design are:

[0074] like Figure 7 As shown, under the premise that the size of the injection head body does not change, the body is simplified, and the structure of the flow channel is affected by three factors: X, Y, and θ. X represents the length of the horizontal section 51, Y represents the axial length of the injection head 2, and θ represents the angle between the horizontal section 51 and the inclined section 52.

[0075] The single factor analysis of the three factors was carried out to obtain the influence of the three factors on mixing uniformity, such as Figure 5 shown.

[0076] Among them, the degree of fluctuation represents the maximum value minus the minimum value of the volume fraction of component B at the outlet section. The smaller the degree of fluctuation, the better the mixing uniformity, and vice versa. The Y factor has the greatest impact on mixing uniformity, and its specific value is as follows: Figure 7 and Figure 8 shown.

[0077] The results show that when the fluctuation between the maximum and minimum values ​​of the material mixing uniformity tends to be stable, the preferred length range of the injection head 2 is 35 to 45 mm.

[0078] As Y increases from 5mm to 45mm, mixing uniformity improves. While increasing the axial length of the injection nozzle 2 can improve mixing between components A and B, a larger Y makes the injection nozzle bulky and extremely inconvenient. Therefore, while maintaining the same length at 45mm, we considered optimizing the flow channel structure to improve mixing uniformity.

[0079] Based on this, a spiral pipe structure is proposed. The flow channel diameter of the spiral pipe structure is still 3mm, and the variables are the number of spiral turns and pitch, such as Figure 7 and Figure 8 shown.

[0080] The injection head 2 in this embodiment can be configured as a spiral pipe structure, and the pitch of the spiral pipe structure ranges from 9.17 to 13.75 mm.

[0081] like Figure 7 and Figure 8 As shown, the use of a spiral structure will improve the mixing uniformity of the rubber material. Within the limitations 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 3 turns, the optimal mixing uniformity can be achieved, and the outlet pressure of the injection head 2 does not change much.

[0082] This embodiment mainly focuses on the mixing and conveying of component A and B materials, namely resin and curing agent, and provides a specific embodiment of an injection head 2, the purpose of which is to avoid the adhesion of the material inside the injection head 2 and to easily form a solidified mucous film on the inner wall surface of the injection head 2. Before the above-mentioned cleaning process using high-pressure gas, the adhesive film that tends to solidify and adheres to the inner wall of the injection head 2 can be removed.

[0083] To this end, the injection head 2 includes an inner tube body 21 and an outer tube body 22 mounted on the inner tube body 21. The outer tube body 22 and the inner tube body 21 have at least a portion protruding from the top of the outer tube body 22. An axial shaft 23 is arranged inside the inner tube body 21. The shaft 23 extends to the end surface of the inner bottom of the outer tube body 22, and a plurality of guide wings 24 are evenly arranged circumferentially. The other ends of the plurality of guide wings 24 are connected to the inner wall of the outer tube body 22.

[0084] An axial drive portion 26 connected to the top of the shaft 23 is provided inside the dispensing head body 1. The axial drive portion 26 is used to drive the shaft 23 to move up and down along the axial direction of the shaft 23, thereby driving the outer tube 22 to move up and down relative to the inner tube 21.

[0085] Of course, before cleaning the material cavity 4, we can close the connection between the injection head 2 and the inner pipe 5. That is, before injecting the cleaning agent and compressed air into the cleaning agent injection channel 6 and the compressed air injection channel 7, we can close the connection between the inner pipe 5 and the injection head 2, and use the state of the cleaning agent and compressed air instantly entering the material cavity 4 to impact the interior of the material cavity 4, thereby achieving flushing.

[0086] Therefore, the inner pipe 5 needs to be connected to the circumferential side wall of the inner tube body 21 near the top; the top of the inner tube body 21 is open and is installed with a sealing plug 25, which is fixedly sleeved on the shaft 23. The shaft 23 drives the sealing plug 25 to move downward until the connection between the inner pipe 5 and the inner tube body 21 is closed.

[0087] This process also includes adjusting the opening size of the inner pipe 5 entering the injection head 2 during the axial displacement of the sealing plug body 25. Its essential purpose is to adjust the flow rate of the A and B components of the inner pipe 5 entering the injection head 2.

[0088] In this embodiment, a mounting hole for axial movement of the sealing plug body 25 and cooperating with the sealing plug body 25 is provided on the inner wall of the injection head body 1 located directly above the inner tube body 21, that is, a guide hole that provides an axial displacement stroke for the sealing plug body 25.

[0089] Of course, in this embodiment, the inner channel 5 can also be closed by the sealing plug 25. After the mixed rubber provided by the injection head 2 is injected into the mold once, the outer tube 22 is driven downward by the axial drive unit 26 (the injection head body 1 needs to cooperate with the movement) and separated from the feed port of the mold. Then, the mixed rubber in the inner tube 21 is separated from the rubber in the feed port. The rubber will not overflow the discharge port 3 (the bottom of the outer tube 22 forms the discharge port 3).

[0090] While the outer tube body 22 moves upward relative to the inner tube body 21 , the inner tube body 21 scrapes off the mixed rubber material remaining on the inner wall of the outer tube body 22 .

[0091] Then the diameter of the bottom of the inner tube body 21 gradually increases along the axial direction of the inner tube body 21 until it is the same as the outer diameter of the inner tube body 21, that is, a trumpet-shaped opening is formed in the bottom of the inner tube body 21, so that the bottom opening of the inner tube body 21 can fully contact the inner wall of the outer tube body 22 and clean the inner wall of the outer tube body 22.

[0092] During the cleaning process of the high-pressure gas and the cleaning agent, they will be flushed out together, which can avoid the situation in which the existing injection head 2 is still stuck and blocked due to the solidified material film remaining on the inner wall surface of the injection head 2 after cleaning.

[0093] Furthermore, since the A and B components enter the mixing process only after entering the injection head 2, the uniformity of the mixing also affects the final product molding.

[0094] To this end, when the mixing state of the materials injected into the mold is not ideal, the mixing and conveying length of the A and B components in the injection head 2 can be extended by increasing the relative length between the inner tube 21 and the outer tube 22.

[0095] Since in this embodiment, high-pressure gas is needed to flush the material chamber 4, considering not introducing a new driving method and reducing the load and control of the driving unit of the injection head body 1, high-pressure gas can be used as the driving source in this embodiment.

[0096] To this end, the axial drive part 26 includes a sealed chamber 261 arranged in the injection head body 1, and a driving piston 262 is arranged in the sealed chamber 261. The driving piston 262 is connected to the top of the shaft 23. The driving piston 262 divides the sealed chamber 261 into an upper chamber 263 and a lower chamber 264. The upper chamber 263 is connected to one of the two material chambers 4 through a first pipe 265, and the lower chamber 264 is connected to the other material chamber 4 through a second pipe 266.

[0097] The high-pressure gas alternately introduced into the two material chambers 4 allows the high-pressure gas to enter the upper chamber 263 through the first pipe 265 or enter the lower chamber 264 through the second pipe 266, thereby driving the shaft 23 to move up and down.

[0098] An air pressure regulating valve 13 is provided on the first pipe 265 and the second pipe 266. Furthermore, in order to prevent the cleaning agent or rubber in the material chamber 4 from affecting the axial drive of the sealing chamber 261 on the shaft 23, or blocking the first channel 265 and the second channel 266, an air pressure regulating valve 13 is provided on the first channel 265 and the second channel 266.

[0099] The main function of the air pressure regulating valve 13 is that when high-pressure gas is introduced into the material chamber 4 and the high-pressure gas reaches a set value, the air pressure regulating valve 13 can be opened, and then the high-pressure gas in the material chamber 4 enters the upper cavity 263 or the lower cavity 264.

[0100] High-pressure gas is alternately introduced into the two material chambers 4, that is, the upper chamber 263 is pressurized and the lower chamber 264 is depressurized (or not pressurized), and the shaft 23 moves downward along its axial direction, or the upper chamber 263 is depressurized (or not pressurized) and the lower chamber 264 is pressurized, and the shaft 23 moves upward along its axial direction.

[0101] Of course, the opening and closing of the air pressure regulating valve 13 can also be actively controlled. The air pressure regulating valve 13 can be an electromagnetic valve structure.

[0102] The purpose is to close the connection between the first channel 265 or the second channel 266 and the material chamber 4 through the air pressure regulating valve 13 after the displacement of the above-mentioned central shaft 23 occurs, thereby maintaining the relative position of the shaft 23 after axial movement, that is, controlling the relative position between the inner tube body 21 and the outer tube body 22, or sealing the plug body 25 to close the connection between the inner pipe 5 and the inner tube body 21.

[0103] This requires that the axial length of the sealing plug body 25 be set to be included in the axial displacement stroke of the shaft 23, that is, during the axial downward displacement of the sealing plug body 25, there is a stroke range in which the inner pipe 5 and the inner tube body 21 can maintain a connected state.

[0104] In this embodiment, in order to maintain the stability of the connection between the structure of the outer tube body 22 itself and the injection head main body 1, as well as the stability of the displacement of the outer tube body 22, a spring 27 is mounted on the outer wall of the outer tube body 22, and the top of the spring 27 is fixedly connected to the injection head main body 1, and the bottom of the spring 27 is fixedly connected to the outer wall of the outer tube body 22. The spring 27 is used to fix the outer tube body 22 and maintain the stability of the outer tube body 22 during axial displacement relative to the inner tube body 21.

[0105] It should be supplemented that the driving part 92 in the present invention is specifically a hydraulic cylinder or a pneumatic cylinder.

[0106] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A self-cleaning glue injection head for HP-RTM two-component glue injection equipment, characterized in that: The invention comprises a glue injection head body (1), wherein a material injection head (2) is arranged at the bottom of the glue injection head body (1), an end of the material injection head (2) away from the glue injection head body (1) forms a material outlet (3), and two material cavities (4) are arranged inside the glue injection head body (1), and the two material cavities (4) are connected to the material injection head (2) through an inner pipe (5) and communicate with the material outlet (3); A material injection channel (6), a cleaning agent injection channel (7) and a compressed air injection channel (8) communicating with the material cavity (4) are provided in the inner wall of the glue injection head body (1) corresponding to each material cavity (4); A first control valve (9) is provided on the glue injection head body (1) corresponding to the material injection channel (6) for controlling the material in the material injection channel (6) to enter the material cavity (4); A second control valve (10) is provided on the head glue injection body (1) corresponding to the cleaning agent injection channel (7) for controlling the cleaning liquid in the cleaning agent injection channel (7) to enter the material cavity (4); A third control valve (11) is provided on the head glue injection body (1) corresponding to the compressed air injection channel (8), and is used to control the compressed air in the compressed air injection channel (8) to enter the material cavity (4); By closing the first control valve (9), and opening the second control valve (10) and the third control valve (11) in sequence, 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 glue injection head for HP-RTM two-component glue injection equipment according to claim 1, characterized in that: The material injection channel (6) is located at an opening on the surface of the head glue injection body (1) and is threadedly connected to a feed seat (12); a first cavity (121) and a second cavity (122) are arranged in the feed seat (12) from bottom to top; the first cavity (121) is connected to the material cavity (4); a feed adapter (123) is arranged on the glue injection head body (1) corresponding to the first cavity (121); and a discharge adapter (124) is arranged on the glue injection head body (1) corresponding to the second cavity (122); The first control valve (9) is arranged on the top of the feed seat (12), and 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 glue injection head for HP-RTM two-component glue injection equipment according to claim 2, characterized in that: The first control valve (9) comprises a valve stem (91) and a driving part (92), and the valve stem (91) passes through the second cavity (122) and the first cavity (121) to enter the material cavity (4); The driving unit (92) drives the valve stem (91) to move upward to the end of the valve stem (91) to close the connection between the first cavity (121) and the material cavity (4), thereby closing the connection between the first cavity (121) and the material cavity (4); Or the driving part (92) drives the valve stem (91) to move downward until the end of the valve stem (91) enters the material cavity (4), and the first cavity (121) is connected to the material cavity (4); the stem body of the valve stem (91) closes the connection between the first cavity (121) and the second cavity (122).

4. The self-cleaning glue injection head for HP-RTM two-component glue injection equipment according to claim 1, characterized in that: The inner pipe (5) comprises 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) away from the horizontal section (51) is connected to the injection head (2).

5. The self-cleaning glue injection head for HP-RTM two-component glue injection equipment according to claim 4, characterized in that: The injection head (5) comprises a spiral pipe structure, the pitch of the spiral pipe structure ranges from 9.17 to 13.75 mm, and the axial length of the spiral pipe structure ranges from 35 to 45 mm.

6. The self-cleaning glue injection head for HP-RTM two-component glue injection equipment according to claim 4, characterized in that: The injection head (2) comprises an inner tube body (21) and an outer tube body (22) sleeved on the inner tube body (21), wherein the inner tube body (22) has at least a portion of the inner tube body (21) protruding from the top of the outer tube body (22), and an axial shaft (23) is axially arranged inside the inner tube body (21), and a plurality of guide wings (24) are evenly arranged circumferentially on the end surface of the end portion of the inner bottom of the outer tube body (22), and the other ends of the plurality of guide wings (24) are connected to the inner wall of the outer tube body (22); An axial drive portion (26) connected to the top of the shaft (23) is arranged inside the injection head body (1), and the axial drive portion (26) is used to drive the shaft (23) to move up and down along the axial direction of the shaft (23), thereby driving the outer tube body (22) to move up and down relative to the inner tube body (21).

7. The self-cleaning glue injection head for HP-RTM two-component glue injection equipment according to claim 6, characterized in that: The inner pipe (5) is connected to the circumferential side wall of the inner tube body (21) near the top; the top of the inner tube body (21) is open and is provided with a sealing plug body (25), and the sealing plug body (25) is fixedly sleeved on the shaft rod (23); The shaft rod (23) drives the sealing plug body (25) to move downward until the connection between the inner pipe (5) and the inner pipe body (21) is closed.

8. The self-cleaning glue injection head for HP-RTM two-component glue injection equipment according to claim 6, characterized in that: The axial drive portion (26) comprises a sealed cavity (261) arranged in the injection head body (1), a driving piston (262) is arranged in the sealed cavity (261), the driving piston (262) is connected to the top of the shaft (23), the driving piston (262) divides the sealed cavity (261) into an upper cavity (263) and a lower cavity (264), the upper cavity (263) is connected to one of the two material cavities (4) through a first pipe (265), and the lower cavity (264) is connected to the other of the two material cavities (4) through a second pipe (266); The high-pressure gas alternately introduced into the two material chambers (4) allows the high-pressure gas to enter the upper chamber (263) through the first pipe (265) or enter the lower chamber (264) through the second pipe (266), thereby driving the shaft (23) to move up and down.

9. The self-cleaning glue injection head for HP-RTM two-component glue injection equipment according to claim 8, characterized in that: Both the first pipeline (265) and the second pipeline (266) are provided with air pressure regulating valves (13).

10. The self-cleaning glue injection head for HP-RTM two-component glue injection equipment according to claim 8, characterized in that: A spring (27) is sleeved on the outer wall of the outer tube body (22); the top of the spring (27) is fixedly connected to the glue injection head body (1); and the bottom of the spring (27) is fixedly connected to the outer wall of the outer tube body (22).

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