Controllable proportioning resin mixing device

Abstract

The present application relates to resin mixing device technical field, disclose a kind of controllable proportioning resin mixing device, including constant-volume metering component, closed mixing cavity, mixing mechanism and discharge mechanism.Constant-volume metering component uses annular resin metering cavity, curing agent metering cavity and stepped common measurement piston arranged coaxially, and resin and curing agent are discharged according to the effective area ratio of two measurement surfaces under common working stroke.Resin is distributed downward along the inner peripheral wall of mixing cavity by annular distribution channel, and curing agent is discharged to resin distribution area by radial distribution hole on center distribution column.Return mixing rotor makes peripheral wall side material flow downward and center side material flow upward;After mixing, return mixing rotor enters receiving sleeve, and mixed resin is pushed out from batch feed port by following discharge piston moving upward.The device is suitable for closed small batch preparation of resin and curing agent and batch feeding.

Description

Technical Field

[0001] This invention relates to the field of resin mixing equipment technology, and in particular to a resin mixing device with controllable proportions. Background Technology

[0002] In the continuous winding process of FRP pipes, the matrix resin and the matching curing agent are usually mixed and then conveyed to the fiber impregnation station. The ratio and mixing state of the two materials affect the pot life of the resin system, the fiber impregnation state, and the subsequent curing process. Since the viscosity of the matrix resin and the curing agent may differ, if the two materials are added directly to the mixing container through ordinary feed pipes, the curing agent with lower viscosity tends to flow to the bottom of the container first, while the resin with higher viscosity may fall along local areas, resulting in a relatively concentrated initial contact area between the two materials after entering the container.

[0003] Existing resin mixing equipment mostly employs a continuous batching system consisting of storage tanks, metering pumps, and mixing tanks. Some equipment also uses a batch mixing method with manual feeding after weighing. Continuous batching systems have long mixing and conveying pipelines, and the mixed resin can easily remain in valve ports, mixing shafts, and discharge pipelines, requiring timely cleaning after shutdown. Manual weighing and feeding is easily affected by factors such as the feeding sequence, material adhering to the walls, and container transfer. For continuous winding stations, if the single feeding time is extended by increasing the mixing tank capacity, the residence time of the mixed resin in the tank will also increase accordingly, making it inconvenient for small-batch, on-demand mixing according to the production rhythm.

[0004] Furthermore, when a conventional agitator rotates within a cylindrical mixing container, some materials tend to move circumferentially with the agitator, resulting in a lack of a stable axial exchange path between the container's periphery and center. After mixing, the agitator continues to occupy the discharge area, easily leading to residual areas around the agitator shaft, at the bottom of the container, and near the discharge port. Therefore, it is necessary to comprehensively improve the metering methods for resin and curing agent, their initial distribution upon entering the mixing chamber, and the discharge structure after mixing. Summary of the Invention

[0005] The purpose of this invention is to provide a resin mixing device with controllable proportions, so as to complete the fixed volume ratio of resin and curing agent in a closed small batch mixing space, so that the two materials form a dispersed initial contact area when entering the closed mixing chamber, and provide clearance space for the piston discharge after mixing.

[0006] To achieve the above objectives, the present invention provides a resin mixing device with controllable proportions, including a volume metering component, a closed mixing chamber, a mixing mechanism, and a discharging mechanism.

[0007] The volumetric metering assembly includes an annular resin metering chamber and a curing agent metering chamber arranged coaxially, as well as a stepped common-stroke metering piston. The stepped common-stroke metering piston includes an annular metering section and a central metering section that are interconnected and move synchronously. The annular metering section slides and seals with the annular resin metering chamber, and the central metering section slides and seals with the curing agent metering chamber. Under the condition that the two metering sections share a common working stroke, the single-batch discharge volume ratio of resin to curing agent is limited by the effective area ratio of the annular metering surface to the central metering surface.

[0008] The annular resin metering chamber is connected to the closed mixing chamber via an annular feeding channel. The outlet of the annular feeding channel is close to the inner peripheral wall of the closed mixing chamber and extends circumferentially thereafter. The curing agent metering chamber is connected to a central distribution column located inside the annular feeding channel. The central distribution column has radial distribution holes facing the resin distribution area. Thus, the resin can be distributed downwards from the peripheral wall side, and the curing agent can be discharged from the central side towards the resin distribution area.

[0009] The mixing mechanism includes a rotatable and axially movable mixing shaft and a reversible mixing rotor disposed below the mixing shaft. The reversible mixing rotor has an outer peripheral guide section that moves the material on the peripheral side downward and a central guide section that moves the material on the central side upward. The upper cover of the enclosed mixing chamber is provided with a receiving sleeve coaxially connected to the central distribution column, and the reversible mixing rotor can move between a mixing position located below the central distribution column and a receiving position located inside the receiving sleeve.

[0010] The discharge mechanism includes a follower discharge piston that slides and seals against the inner peripheral wall of the closed mixing chamber. The side wall of the closed mixing chamber is provided with a batch feed port. When the retractable mixing rotor is in the storage position, it exits the propulsion area of ​​the follower discharge piston, and the follower discharge piston can move upward and push the mixed resin out of the batch feed port.

[0011] Furthermore, the annular resin metering chamber and the curing agent metering chamber are respectively equipped with a feed check valve and a discharge check valve. When the stepped common-stroke metering piston returns, the two metering chambers respectively draw in the corresponding materials; when the stepped common-stroke metering piston performs its working stroke, the two metering chambers simultaneously discharge materials through the corresponding discharge check valves.

[0012] Furthermore, the curing agent metering chamber is defined by a metering sleeve detachably installed at the center of the metering housing. The metering sleeve and the central metering section form a constant-volume metering assembly. The constant-volume metering assembly also includes a stroke limiter for limiting the working stroke of the stepped common-stroke metering piston. By replacing the mating metering sleeve and the central metering section, the effective metering area of ​​the curing agent metering chamber can be adjusted; by adjusting the common working stroke, the total discharge volume of a single batch can be adjusted.

[0013] Furthermore, the annular fabric channel is arranged around the outer periphery of the receiving sleeve. The radial distribution holes are arranged in at least two sets along the axial direction of the central distribution column, with each set of radial distribution holes distributed at intervals along the circumference of the central distribution column. Adjacent sets of radial distribution holes are staggered in the circumferential direction, and the outlet of the radial distribution holes is located inside the outlet of the annular fabric channel.

[0014] Furthermore, the central distribution column extends from the lower part of the receiving sleeve into the closed mixing chamber. The central distribution column includes an inner cylinder wall and an outer cylinder wall arranged coaxially. The inner cylinder wall forms a central passageway communicating with the interior of the receiving sleeve. An annular curing agent distribution chamber, isolated from the central passageway, is formed between the inner and outer cylinder walls. A radial distribution hole penetrates the outer cylinder wall and communicates with the annular curing agent distribution chamber. A mixing shaft passes through the receiving sleeve and the central passageway.

[0015] Furthermore, the outer peripheral guide section consists of downward-pressing helical blades arranged along the outer periphery of the reversible mixing rotor, while the central guide section consists of upward-lifting helical blades located inside the downward-pressing helical blades. A flow-deflecting connection is provided between the downward-pressing helical blades and the upward-lifting helical blades, and the flow-deflecting connection has an overflow window.

[0016] Furthermore, the lower opening of the receiving sleeve is equipped with an elastic scraper ring surrounding the central passageway, which can slide in contact with the outer edge of the reversing mixing rotor during the upward process. The outer circumference of the follow-up discharge piston is equipped with a scraper sealing ring, and the upper part of the follow-up discharge piston is equipped with a central venting protrusion corresponding to the central passageway and a guide slope extending outward from the central venting protrusion. The batch feed port is located on the upper sidewall of the closed mixing chamber and corresponds to the upper area of ​​the guide slope; when the follow-up discharge piston reaches its upper limit position, the central venting protrusion extends into the lower part of the central passageway.

[0017] Furthermore, the device also includes a mechanical phase switching assembly located near the upper cover. The mechanical phase switching assembly includes a switching member having a metering position, a mixing position, and a feeding position; a first mechanical limiting member connected to the lifting seat of the mixing shaft; a second mechanical limiting member linked to the lower limit position of the follow-up discharge piston; and a feeding stop member cooperating with the discharge passages of the two metering chambers. The first mechanical limiting member prevents the switching member from entering the feeding position before the retracting mixing rotor reaches the receiving position; the second mechanical limiting member prevents the switching member from returning to the metering position before the follow-up discharge piston returns to the lower limit position.

[0018] Furthermore, the constant volume metering component, the closed mixing chamber, the mixing mechanism, and the discharging mechanism together constitute a batch mixing unit, of which two are arranged side by side. The two batch mixing units are alternately connected to the same main feed pipe through a batch switching valve. The batch switching valve is equipped with a pressure equalization bypass and a differential pressure limiting device. The pressure equalization bypass is used to connect the batch mixing unit to be supplied with the main feed pipe before the main feed path is switched, and the differential pressure limiting device is used to restrict the switching valve core from switching the main feed path when the pressure difference between the side to be supplied and the main feed pipe is greater than a set value.

[0019] Compared to existing conventional feed pipes and independent mixing tank structures, this invention employs two coaxially arranged metering chambers and two interconnected metering sections, enabling the two materials to be discharged synchronously within the same working stroke. The single-batch discharge volume ratio is primarily determined by the effective area relationship of the corresponding metering surfaces. The annular material distribution channel and the central distribution column introduce the two materials from the peripheral wall side and the central side, respectively, which helps to increase the contact points between the two materials when they enter the closed mixing chamber.

[0020] The reversible mixing rotor, through its outer and central guide sections, creates opposing axial conveying forces, enabling axial exchange between materials on the peripheral and central sides. After mixing, the reversible mixing rotor enters the receiving sleeve via the central passageway, and then moves upward along the closed mixing chamber following the discharge piston. This assembly prevents the reversible mixing rotor from continuously occupying the piston's propulsion area. The central venting protrusion, guide slope, and scraper sealing ring work together to reduce material retention on the peripheral walls of the closed mixing chamber, near the inlet of the central passageway, and around the batch feed port.

[0021] The mechanical phase switching component is constrained by the receiving position of the reversible mixing rotor and the lower limit position of the follow-up discharge piston, respectively, so that the feeding action corresponds to the rotor receiving state and the next batch metering action corresponds to the discharge piston reset state. The dual-batch mixing unit alternately supplies materials through a batch switching valve with a pressure equalization bypass, so that the metering and mixing of the next batch of materials can be completed by the other batch mixing unit while the other batch mixing unit is feeding materials. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the controllable proportion resin mixing device provided in an embodiment of the present invention. Figure 2This is a schematic cross-sectional view of the batch mixing unit provided in an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of the volumetric metering component provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the reversible hybrid rotor structure provided in an embodiment of the present invention; Figure 5 This is a schematic diagram showing the connection between two batch mixing units and a batch switching valve provided in an embodiment of the present invention.

[0024] In the diagram: 1. Frame; 2. Constant volume metering assembly; 21. Annular resin metering chamber; 211. Resin inlet; 212. Resin inlet check valve; 213. Resin outlet check valve; 22. Curing agent metering chamber; 221. Curing agent inlet; 222. Curing agent inlet check valve; 223. Curing agent outlet check valve; 23. Stepped common stroke metering piston; 231. Annular metering section; 232. Central metering section; 233. Common piston rod; 24. Metering drive; 25. Stroke limiter; 26. Metering sleeve; 27. Metering housing; 3. Closed mixing chamber; 32. Top cover; 33. Annular material distribution channel; 34. Central distribution column; 35. Batch feed port; 36. Feed valve; 41. Mixing shaft; 42. Rotary drive; 43. Lifting drive; 44. 441. Downward-pressing spiral blade; 442. Upward-lifting spiral blade; 443. Baffle connection; 444. Flow window; 45. Receiving sleeve; 5. Discharge mechanism; 51. Follow-up discharge piston; 511. Scraper sealing ring; 512. Central venting protrusion; 513. Guide slope; 52. Discharge piston rod; 53. Discharge drive component; 6. Mechanical phase switching assembly; 61. Switching component; 62. First mechanical limit component; 63. Second mechanical limit component; 64. Feed stop component; 7. Batch switching valve; 71. First feed port; 72. Second feed port; 73. Common discharge port; 74. Switching valve core; 75. Pressure equalization bypass; 76. Differential pressure limit component; 8. First batch mixing unit; 9. Second batch mixing unit; 10. Main feed pipe. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are one implementation of the present invention, but not all implementations. Other implementations obtained by those skilled in the art based on the disclosure of the present invention without creative effort are all within the protection scope of the present invention.

[0026] To enable those skilled in the art to better understand the present invention, the structure and working process of the controllable proportion resin mixing device will be further described below with reference to the accompanying drawings.

[0027] Example 1:

[0028] Please see Figure 1 and Figure 2 This embodiment provides a controllable proportion resin mixing device, including a frame 1 and a volumetric metering component 2, a closed mixing chamber 3, a mixing mechanism, and a discharge mechanism 5 mounted on the frame 1. The volumetric metering component 2 is located above the closed mixing chamber 3, the mixing mechanism extends into the chamber from the upper part, and the discharge mechanism 5 is located at the bottom of the closed mixing chamber 3. The upper cover 32 of the closed mixing chamber 3 is detachably connected to the chamber body to facilitate the assembly and maintenance of the internal components.

[0029] This device can be installed near the resin impregnation station of a continuous winding production line. The single-batch capacity of the closed mixing chamber 3 can be determined based on the material consumption of the material-using station within a predetermined time, ensuring that each batch of mixed resin is supplied within the usable time of the corresponding resin system. The closed mixing chamber 3 is used to receive, mix, and discharge a single batch of material and is not used as a long-term storage container for the mixed resin.

[0030] In this embodiment, the resin is the base resin used for molding fiberglass products, and the curing agent is a liquid curing component used in conjunction with the base resin. For resin systems using initiators or other liquid active components, the corresponding liquid component can also be metered to a fixed volume using the curing agent metering chamber 22. The target ratio, allowable mixing time, and usable time of the two materials should be determined according to the actual resin system; this device does not change the reaction conditions of the resin system itself.

[0031] Constant volume metering components: Please see Figure 2 and Figure 3 The volumetric metering assembly 2 includes a metering housing 27, within which are an annular resin metering chamber 21 and a curing agent metering chamber 22. The curing agent metering chamber 22 is located inside the annular resin metering chamber 21 and is coaxially arranged with it. A sealing structure is provided between the two metering chambers to keep the resin and curing agent separated during the metering process.

[0032] In this embodiment, an annular resin metering cavity 21 is formed between the outer wall of the metering housing 27 and the outer peripheral wall of the metering sleeve 26, and a curing agent metering cavity 22 is formed within the inner cavity of the metering sleeve 26. The metering sleeve 26 is detachably installed at the center of the metering housing 27. A positioning flange may be provided on the outer periphery of the metering sleeve 26, which engages with the mounting step of the metering housing 27 and is axially fixed by a clamping member; a sealing ring is provided between the positioning flange and the mounting step. This structure allows the metering sleeve 26 to be positioned relative to the metering housing 27 and reduces the possibility of material cross-contamination between the two metering cavities.

[0033] The stepped common-stroke metering piston 23 includes an annular metering section 231, a central metering section 232, and a common piston rod 233. The annular metering section 231 is annular and slidably sealed within the annular resin metering chamber 21, while the central metering section 232 is slidably sealed within the curing agent metering chamber 22. The annular metering section 231 and the central metering section 232 are connected to the common piston rod 233 via a common connecting frame, enabling the two metering sections to move synchronously in the same direction under the drive of the metering drive component 24 and to have the same working stroke.

[0034] The working end face of the annular metering section 231 facing the discharge end of the annular resin metering chamber 21 forms an annular metering surface, and the working end face of the central metering section 232 facing the discharge end of the curing agent metering chamber 22 forms a central metering surface. Under the condition of the same common working stroke, the effective area relationship of the two metering surfaces determines the discharge volume relationship of the two metering chambers. When the production formula is determined by mass ratio, the metering sleeve 26 and the central metering section 232 of the appropriate specifications can be selected according to the density of the resin and curing agent and the target mass ratio, so that the effective metering area of ​​the curing agent metering chamber 22 matches the effective metering area of ​​the annular resin metering chamber 21.

[0035] The annular resin metering chamber 21 is provided with a resin inlet 211, a resin inlet check valve 212 is installed at the resin inlet 211, and a resin outlet check valve 213 is installed at the discharge end of the annular resin metering chamber 21. The curing agent metering chamber 22 is provided with a curing agent inlet 221, a curing agent inlet check valve 222 is installed at the curing agent inlet 221, and a curing agent outlet check valve 223 is installed at the discharge end of the curing agent metering chamber 22.

[0036] When the stepped common-stroke metering piston 23 returns to the direction away from the closed mixing chamber 3, the internal volume of the two metering chambers increases. The resin feed check valve 212 and the curing agent feed check valve 222 open, while the resin discharge check valve 213 and the curing agent discharge check valve 223 close, allowing resin and curing agent to enter their respective metering chambers. When the stepped common-stroke metering piston 23 performs its working stroke towards the closed mixing chamber 3, both feed check valves close, and both discharge check valves open, allowing the two materials to be discharged synchronously within the common working stroke.

[0037] The metering drive 24 can be a hydraulic cylinder, a pneumatic-hydraulic booster cylinder, or a screw mechanism driven by a geared motor. The output end of the metering drive 24 is connected to the common piston rod 233 to provide axial thrust to the stepped common-stroke metering piston 23. The specific form of the metering drive 24 can be selected according to the resin viscosity, single batch discharge volume, and equipment power conditions, without changing the common-stroke motion relationship between the annular metering section 231 and the central metering section 232.

[0038] The metering housing 27 is equipped with a stroke limiter 25. The stroke limiter 25 can be an adjustable stop block arranged along the movement direction of the common piston rod 233, or it can be a threaded limit sleeve that mates with the output end of the metering drive 24. Adjusting the stroke limiter 25 can change the effective working stroke of the stepped common-stroke metering piston 23, thereby changing the total discharge volume of a single batch of material. Since the two metering sections move synchronously, the volume ratio determined by the two metering surfaces remains unchanged when adjusting the common working stroke.

[0039] When it is necessary to change the volume ratio of the curing agent, the mating metering sleeve 26 and the central metering section 232 can be replaced. Different sizes of metering sleeves 26 have different inner diameters and form a constant volume metering pair with the corresponding outer diameter central metering section 232. The annular resin metering chamber 21 and the annular metering section 231 can continue to be used, thereby changing the effective area relationship of the two metering surfaces by replacing the constant volume metering pair on the central side.

[0040] Circular fabric and center distribution structure: Please see Figure 2 and Figure 3 The discharge end of the annular resin metering chamber 21 is connected to the annular material distribution channel 33 via the resin discharge check valve 213. The annular material distribution channel 33 is located inside the upper cover 32 of the closed mixing chamber 3 and extends around the outer periphery of the receiving sleeve 45; the annular material distribution channel 33 and the receiving sleeve 45 are separated by the solid wall of the upper cover 32.

[0041] The lower part of the annular feeding channel 33 forms an annular feeding outlet extending circumferentially along the closed mixing chamber 3. The annular feeding outlet is located close to the inner circumferential wall of the closed mixing chamber 3 and forms a smooth transition with the inner circumferential wall. After the resin is discharged from the annular feeding outlet, it is distributed downward along the inner circumferential wall of the closed mixing chamber 3 under the action of gravity and the thrust of subsequent materials. Multiple pressure equalization holes can be provided circumferentially in the annular feeding channel 33 to distribute the resin entering the annular feeding channel 33 to different positions of the annular feeding outlet, so as to reduce the resin concentration on the side near the resin discharge check valve 213.

[0042] The discharge end of the curing agent metering chamber 22 is connected to the central distribution column 34 via the curing agent discharge check valve 223. The central distribution column 34 is located inside the annular fabric outlet and extends axially into the closed mixing chamber 3 from the lower part of the receiving sleeve 45. The central distribution column 34 includes an inner cylinder wall and an outer cylinder wall arranged coaxially. The inner cylinder wall forms a central passage, which communicates upward with the interior of the receiving sleeve 45. An annular curing agent distribution chamber is formed between the inner cylinder wall and the outer cylinder wall. The annular curing agent distribution chamber and the central passage are sealed and isolated from each other. The lower end of the annular curing agent distribution chamber is closed by an annular end wall.

[0043] The outer cylinder wall of the central distribution column 34 is provided with multiple sets of radial distribution holes. These radial distribution holes penetrate the outer cylinder wall and communicate with the annular curing agent distribution chamber, but are not connected to the central channel. The outlets of the radial distribution holes face the resin distribution area below the annular fabric outlet. In this embodiment, the radial distribution holes are arranged in three sets along the axial direction of the central distribution column 34, with each set of radial distribution holes spaced apart circumferentially along the central distribution column 34, and adjacent sets of radial distribution holes staggered circumferentially. A flow-collecting space is left between the lowermost set of radial distribution holes and the closed end wall of the annular curing agent distribution chamber, allowing the curing agent to be distributed circumferentially and discharged from each radial distribution hole after entering the annular curing agent distribution chamber.

[0044] The number, diameter, and total flow area of ​​the radial distribution holes can be determined based on the curing agent viscosity, single batch discharge volume, and the advancing speed of the stepped common-stroke metering piston 23. The total flow area of ​​each radial distribution hole should meet the discharge requirements of the curing agent within the metering working stroke and maintain similar discharge conditions at different circumferential positions.

[0045] When the stepped common-stroke metering piston 23 performs its working stroke, the resin is distributed downwards from the annular fabric outlet along the inner peripheral wall of the closed mixing chamber 3, while the curing agent is discharged outwards from the radial distribution hole located inside the annular fabric outlet. The two materials form multiple contact points during their entry into the closed mixing chamber 3, reducing the possibility of the curing agent flowing to the bottom of the chamber from a single outlet.

[0046] Hybrid mechanism: Please see Figure 2 and Figure 4 The mixing mechanism includes a mixing shaft 41, a rotary drive 42, a lifting drive 43, and a reversing mixing rotor 44. The rotary drive 42 is mounted on a lifting base, and the mixing shaft 41 is connected to the output end of the rotary drive 42. The lifting drive 43 drives the lifting base and the mixing shaft 41 to move axially along the closed mixing chamber 3. The rotary drive 42 can be a geared motor; the lifting drive 43 can be a hydraulic cylinder, a pneumatic cylinder, or a screw lifting mechanism.

[0047] The mixing shaft 41 passes through the central passage of the receiving sleeve 45 and the central distribution column 34, and an axial sliding seal is provided between the mixing shaft 41 and the receiving sleeve 45. The lateral dimensions of the receiving sleeve 45 and the central passage are both larger than the maximum passage profile of the reversible mixing rotor 44 when it is raised or lowered, so that the reversible mixing rotor 44 can pass through the central passage and enter the receiving sleeve 45 from the mixing position in the closed mixing chamber 3.

[0048] The reversible mixing rotor 44 is fixed to the lower part of the mixing shaft 41 and includes a downward pressing helical blade 441, an upward lifting helical blade 442, and a flow-deflecting connecting part 443. The downward pressing helical blade 441 is located on the outer periphery of the reversible mixing rotor 44, and the upward lifting helical blade 442 is located on the inner side of the downward pressing helical blade 441. The helical direction and installation angle of the downward pressing helical blade 441 and the upward lifting helical blade 442 are matched so that when the reversible mixing rotor 44 rotates in a predetermined direction, the downward pressing helical blade 441 pushes the material close to the inner peripheral wall of the closed mixing chamber 3 downward, and the upward lifting helical blade 442 pushes the material close to the mixing shaft 41 upward.

[0049] The downward-pressing spiral blade 441 and the upward-lifting spiral blade 442 are connected by a baffle connection 443. The baffle connection 443 has multiple flow windows 444. Under the action of the downward-pressing spiral blade 441, the material on the peripheral wall side moves towards the lower part of the closed mixing chamber 3 and then transfers to the center side, and is then conveyed upward by the upward-lifting spiral blade 442; some material can also pass through the flow windows 444 to exchange between the inner and outer areas.

[0050] During mixing, the lifting drive 43 lowers the reversible mixing rotor 44 into the closed mixing chamber 3. At this time, the reversible mixing rotor 44 is located below the central distribution column 34 and maintains an axial distance from the follow-up discharge piston 51. The rotation drive 42 drives the reversible mixing rotor 44 to rotate, causing the material in the closed mixing chamber 3 to flow in a reversible manner with the peripheral walls facing downwards and the center facing upwards. The rotational speed and mixing time of the reversible mixing rotor 44 can be set according to the resin viscosity, curing agent dosage, batch capacity, and the usable time of the resin system.

[0051] Storage and layout structure: Please continue reading Figure 2 The receiving sleeve 45 is arranged along the axis of the closed mixing chamber 3, and its length is sufficient to accommodate the main body of the reversible mixing rotor 44. The central channel of the central distribution column 34 is continuously arranged inside the receiving sleeve 45. When the reversible mixing rotor 44 moves upward from the mixing position, it first enters the central channel of the central distribution column 34, and then enters the receiving sleeve 45 along the central channel; after reaching the receiving position, the main body of the reversible mixing rotor 44 is located inside the receiving sleeve 45 and above the radial distribution hole.

[0052] The lower opening of the receiving sleeve 45 is provided with an elastic scraper ring 451. The elastic scraper ring 451 is located at the transition position between the receiving sleeve 45 and the central distribution column 34, and is arranged around the central passage. Figure 2 In the longitudinal section shown, the inner edge of the elastic scraper ring 451 extends from both sides of the axis toward the center through a channel and is able to slide in contact with the outer edge of the reversible mixing rotor 44. The elastic scraper ring 451 can be made of an elastic material compatible with the resin system used.

[0053] After mixing is complete, the rotary drive 42 stops operating, and the lifting drive 43 drives the mixing shaft 41 and the reversible mixing rotor 44 to move upward. When the reversible mixing rotor 44 passes through the central passage and the elastic scraper ring 451, some of the mixed resin adhering to its outer edge and protruding parts is scraped back into the closed mixing chamber 3 by the elastic scraper ring 451. The reversible mixing rotor 44 continues to move upward to the receiving position, so that a continuous propulsion space is formed above the follower discharge piston 51.

[0054] The discharge mechanism 5 includes a follower discharge piston 51, a discharge piston rod 52, and a discharge drive component 53. The follower discharge piston 51 is located at the bottom of the closed mixing chamber 3 and slides against the inner peripheral wall of the closed mixing chamber 3. The discharge piston rod 52 passes through the guide seal at the bottom of the closed mixing chamber 3 and is connected to the discharge drive component 53. The discharge drive component 53 can be a hydraulic cylinder, a pneumatic-hydraulic booster cylinder, or a screw drive mechanism.

[0055] The outer periphery of the follower discharge piston 51 is provided with a scraping sealing ring 511. The scraping sealing ring 511 is used to restrict the mixed resin from entering below the follower discharge piston 51 and to scrape the inner peripheral wall of the closed mixing chamber 3 when the follower discharge piston 51 moves upward. A central venting protrusion 512 is formed on the upper part of the follower discharge piston 51, and the central venting protrusion 512 is coaxially corresponding to the central through channel of the central distribution column 34. The outer periphery of the central venting protrusion 512 is provided with a guide slope 513 extending towards the edge of the follower discharge piston 51.

[0056] The batch feed port 35 is located on the upper side wall of the closed mixing chamber 3 and corresponds to the upper area of ​​the guide slope 513; a feed valve 36 is installed at the batch feed port 35. Before discharge, the reversible mixing rotor 44 enters the receiving sleeve 45, and the feed valve 36 opens. The discharge drive 53 pushes the follower discharge piston 51 upward via the discharge piston rod 52, the effective volume of the closed mixing chamber 3 gradually decreases, and the mixed resin moves along the guide slope 513 towards the batch feed port 35 and is discharged.

[0057] When the follow-up discharge piston 51 approaches its upper limit position, the central venting protrusion 512 extends into the lower part of the central passage of the central distribution column 34, reducing the remaining space below the central distribution column 34 and near the entrance of the central passage; the wall-scraping sealing ring 511 simultaneously scrapes the inner peripheral wall of the closed mixing chamber 3. The advancing speed of the discharge drive 53 can be adjusted according to the required feeding speed of the main feed pipe 10. The follow-up discharge piston 51 is used to push out the batch of material that has been mixed and does not participate in determining the ratio between resin and curing agent.

[0058] Mechanical phase switching component: Please see Figure 1 and Figure 2The mechanical phase switching assembly 6 is disposed near the upper cover 32 of the enclosed mixing chamber 3, and includes a switching component 61, a first mechanical limiting component 62, a second mechanical limiting component 63, and a feed stop component 64. The switching component 61 can be a switching disc that rotates around a fixed axis, or a switching sleeve that moves along a guide seat. In this embodiment, a switching disc is used. The switching disc has positioning parts corresponding to the metering position, mixing position, and feeding position, and has a feeding limiting groove that cooperates with the first mechanical limiting component 62.

[0059] The feed shut-off component 64 cooperates with the downstream discharge passages of the resin discharge check valve 213 and the curing agent discharge check valve 223. When the switching component 61 is in the metering position, the feed shut-off component 64 releases the shut-off effect on the two discharge passages, allowing the two materials to enter the closed mixing chamber 3 along the working stroke of the stepped common-stroke metering piston 23; after the switching component 61 leaves the metering position, the feed shut-off component 64 closes the two discharge passages. The switching component 61 is also linked to the opening and closing end of the feed valve 36, so that the feed valve 36 is closed when the switching component 61 is in the metering or mixing position, and the feed valve 36 is open when the switching component 61 enters the feeding position.

[0060] The first mechanical limiting member 62 is connected to the lifting seat of the mixing shaft 41. When the reversing mixing rotor 44 has not fully entered the receiving sleeve 45, the first mechanical limiting member 62 extends into the feeding limiting groove of the switching member 61, preventing the switching member 61 from entering the feeding position; after the reversing mixing rotor 44 reaches the receiving position, the first mechanical limiting member 62 exits the feeding limiting groove with the lifting seat, releasing the restriction on the switching member 61.

[0061] The second mechanical limiter 63 is linked to the lower limit position of the follower discharge piston 51. After the follower discharge piston 51 leaves the lower limit position, the second mechanical limiter 63 prevents the switching component 61 from returning to the metering position; after the follower discharge piston 51 completes discharge and resets to the lower limit position, the second mechanical limiter 63 releases the restriction on the switching component 61.

[0062] When the switching component 61 is in the metering position, the feed valve 36 is closed, the follow-up discharge piston 51 is held at the lower limit position, and the discharge passages of the two metering chambers are open. When the switching component 61 is in the mixing position, the feed stopper 64 closes the discharge passages of the two metering chambers, the feed valve 36 remains closed, and the reversible mixing rotor 44 is located in the closed mixing chamber 3. Only after the reversible mixing rotor 44 reaches the receiving position and the first mechanical limiter 62 exits the feed limit groove can the switching component 61 enter the feeding position; at this time, the feed valve 36 opens, and the follow-up discharge piston 51 can move upward. The above phase restriction relationship is used to ensure that the metering, mixing, and feeding actions are performed sequentially according to the corresponding structural states.

[0063] Work process: When the device starts working, the follow-up discharge piston 51 is in the lower limit position, the reversing mixing rotor 44 is in the receiving sleeve 45, the feeding valve 36 is closed, and the switching component 61 is in the metering position.

[0064] The metering drive 24 first drives the stepped common-stroke metering piston 23 to perform a return stroke, allowing the resin and curing agent to enter the annular resin metering chamber 21 and the curing agent metering chamber 22, respectively. After the stepped common-stroke metering piston 23 reaches the end of the return stroke, the metering drive 24 reverses its direction and drives the stepped common-stroke metering piston 23 to perform a working stroke. The resin is distributed downwards along the inner circumferential wall of the closed mixing chamber 3 through the annular feeding channel 33, and the curing agent is discharged into the resin distribution area through the radial distribution holes on the central distribution column 34. After the stepped common-stroke metering piston 23 reaches the position limited by the stroke limiter 25, the single batch feeding is completed.

[0065] Subsequently, the switching component 61 enters the mixing position, the feed stop component 64 closes the discharge passage of the two metering chambers, and the feed valve 36 remains closed. The lifting drive component 43 drives the reversing mixing rotor 44 to descend from the receiving sleeve 45 into the closed mixing chamber 3, and the rotation drive component 42 drives the reversing mixing rotor 44 to rotate. The downward pressing helical blades 441 move the material on the peripheral side downward, and the upward lifting helical blades 442 move the material on the center side upward. The material can also be exchanged between the inner and outer areas through the flow window 444.

[0066] After the predetermined mixing time is reached, the rotary drive 42 stops operating, and the lifting drive 43 drives the reversible mixing rotor 44 to rise. The reversible mixing rotor 44 enters the central passage of the central distribution column 34 and continues to move upward along the central passage. Since the annular curing agent distribution chamber is located between the inner and outer cylinder walls of the central distribution column 34 and is isolated from the central passage, the lifting path of the reversible mixing rotor 44 is separate from the curing agent flow path. After passing the elastic scraper ring 451, the reversible mixing rotor 44 enters the receiving sleeve 45 until its main body reaches the receiving position above the radial distribution hole.

[0067] After the first mechanical limiter 62 exits the feeding limit groove along with the lifting seat, the switching component 61 can enter the feeding position, and the feeding valve 36 opens. The discharge drive 53 pushes the follow-up discharge piston 51 upward, and the mixed resin is discharged from the batch feeding port 35 and enters the feeding main pipe 10. After the discharge is completed, the discharge drive 53 drives the follow-up discharge piston 51 back to the lower limit position; the second mechanical limiter 63 is released, and the switching component 61 can re-enter the metering position, and the device enters the metering process for the next batch.

[0068] Example 2:

[0069] Please see Figure 5In this embodiment, based on Embodiment 1, a first batch mixing unit 8 and a second batch mixing unit 9 are arranged side by side. Both the first batch mixing unit 8 and the second batch mixing unit 9 include a volumetric metering component 2, a closed mixing chamber 3, a mixing mechanism, a discharge mechanism 5, and a mechanical phase switching component 6.

[0070] The batch feed port 35 of the first batch mixing unit 8 is connected to the first feed port 71 of the batch switching valve 7, the batch feed port 35 of the second batch mixing unit 9 is connected to the second feed port 72 of the batch switching valve 7, and the common discharge port 73 of the batch switching valve 7 is connected to the main feed pipe 10.

[0071] The batch switching valve 7 includes a switching valve core 74 and a pressure equalization bypass 75. The switching valve core 74 can switch between a first feeding position and a second feeding position, so that the two batch mixing units are alternately connected to the common discharge port 73. The flow area of ​​the pressure equalization bypass 75 is smaller than the flow area of ​​the main feeding passage of the batch switching valve 7, and is used to connect the batch mixing unit to be fed to the main feeding pipe 10 before the main feeding passage is switched.

[0072] The batch switching valve 7 can also be equipped with a differential pressure limiting element 76. The differential pressure limiting element 76 is connected to the outlet side of the batch mixing unit to be supplied and the main supply pipe 10, respectively. When the differential pressure between the two sides is greater than the set value, the differential pressure limiting element 76 restricts the switching valve core 74 from entering the next main supply position; when the differential pressure between the two sides decreases, the differential pressure limiting element 76 releases the restriction on the switching valve core 74. The differential pressure limiting element 76 can be a limiting piston that bears the pressure of the side to be supplied and the pressure of the main supply pipe at both ends respectively. When the differential pressure is large, the limiting piston extends into the limiting groove of the switching valve core 74, and when the differential pressure decreases, it exits the limiting groove under the action of the reset elastic element.

[0073] When the two batch mixing units operate alternately, one batch mixing unit performs the feeding process, while the other batch mixing unit performs the metering and mixing process for the next batch of material. When the currently feeding batch mixing unit approaches the discharge endpoint, the pressure equalization bypass 75 first connects the batch mixing unit to be fed with the main feeding pipe 10, allowing pressure to gradually build up on the feeding side; once the pressure difference between the two sides meets the switching conditions, the switching valve core 74 then switches the main feeding path. This operating mode does not require both batch mixing units to simultaneously supply material at full flow.

[0074] In this embodiment, the metering drive 24, rotation drive 42, lifting drive 43, and discharge drive 53 can be equipped with hydraulic, pneumatic, or electric actuators depending on the power conditions of the equipment. The control system can be used to issue action commands and display the equipment status, but the single-batch volume ratio of resin to curing agent is still limited by the geometric metering relationship of the constant volume metering component 2.

[0075] Without changing the basic structural relationships such as the co-movement of the two metering sections, the circumferential distribution of resin, the central distribution of curing agent, the axial lifting and lowering of the reversing mixing rotor, and the pushing of the follow-up discharge piston, the metering drive form, the number of blades of the reversing mixing rotor 44, the number of radial distribution holes, and the installation position of the batch mixing unit can be adjusted according to the capacity of the closed mixing chamber 3 and the resin system.

[0076] This document describes the structure and operation of the present invention using specific embodiments. For those skilled in the art, adjustments can be made to the metering drive method, the number of rotor blades, the valve body connection method, and the arrangement of the batch mixing unit without departing from the basic concept of the present invention; all such adjustments should fall within the protection scope of the present invention.

Claims

1. A resin mixing device with controllable proportioning, characterized in that, The system includes a volumetric metering assembly, a closed mixing chamber, a mixing mechanism, and a discharging mechanism. The volumetric metering assembly comprises a coaxially arranged annular resin metering chamber and a curing agent metering chamber, and a stepped common-stroke metering piston composed of interconnected annular metering sections and a central metering section. The two metering sections slide and seal with their respective metering chambers and move synchronously with equal strokes, so that the discharge volume ratio of resin to curing agent is limited by the effective area ratio of the working end faces of the two metering sections. The annular resin metering chamber is connected to the closed mixing chamber via an annular feeding channel. The outlet of the annular feeding channel is close to the inner circumferential wall of the closed mixing chamber and extends circumferentially thereafter. The curing agent metering chamber is connected to a central distribution column located inside the annular feeding channel. The central distribution column has radial distribution holes facing the resin distribution area and forms... The mixing mechanism includes a centrally located, axially extending channel; a mixing shaft capable of rotation and axial lifting, and a reversible mixing rotor located below the mixing shaft. The reversible mixing rotor has an outer peripheral guide section and a central guide section to drive the material on the peripheral side downward and the material on the central side upward, respectively. The upper cover of the closed mixing chamber is provided with a receiving sleeve coaxially connected to the central channel. The reversible mixing rotor can rise from the mixing position below the central distribution column through the central channel to the receiving position inside the receiving sleeve. The discharge mechanism includes a follow-up discharge piston that slides and seals with the inner peripheral wall of the closed mixing chamber. The side wall of the closed mixing chamber is provided with a batch feeding port. When the reversible mixing rotor is in the receiving position, it exits the advancing area of ​​the follow-up discharge piston.

2. The resin mixing device with controllable proportioning according to claim 1, characterized in that, The annular resin metering chamber is equipped with a resin inlet check valve and a resin outlet check valve, and the curing agent metering chamber is equipped with a curing agent inlet check valve and a curing agent outlet check valve. When the stepped common-stroke metering piston returns, the two metering chambers respectively draw in resin and curing agent. When the stepped common-stroke metering piston performs its working stroke, the two metering chambers simultaneously discharge material through their corresponding outlet check valves.

3. The resin mixing device with controllable proportioning according to claim 1, characterized in that, The curing agent metering chamber is defined by a metering sleeve that is detachably installed at the center of the metering housing. The metering sleeve and the central metering section form a constant volume metering pair. The constant volume metering assembly also includes a stroke limiter for limiting the working stroke of the stepped common-stroke metering piston.

4. The resin mixing device with controllable proportioning according to claim 1, characterized in that, The annular fabric channel is arranged around the outer periphery of the receiving sleeve. The radial distribution holes are arranged in at least two groups along the axial direction of the central distribution column. Each group of radial distribution holes is distributed at intervals along the circumference of the central distribution column. Adjacent groups of radial distribution holes are staggered in the circumferential direction, and the outlet of the radial distribution hole is located inside the outlet of the annular fabric channel.

5. The resin mixing device with controllable proportioning according to claim 1, characterized in that, The central distribution column extends from the lower part of the receiving sleeve into the closed mixing chamber. The central distribution column includes an inner cylinder wall and an outer cylinder wall arranged coaxially. The inner cylinder wall forms a central passage channel communicating with the interior of the receiving sleeve. An annular curing agent distribution cavity is formed between the inner cylinder wall and the outer cylinder wall, which is isolated from the central passage channel. The radial distribution hole penetrates the outer cylinder wall and communicates with the annular curing agent distribution cavity. The mixing shaft passes through the receiving sleeve and the central passage channel. When the reversing mixing rotor is in the receiving position, it is located above the radial distribution hole.

6. The resin mixing device with controllable proportioning according to claim 1, characterized in that, The outer peripheral guide section is a downward pressing helical blade arranged along the outer periphery of the reversing mixing rotor, and the central guide section is an upward lifting helical blade arranged inside the downward pressing helical blade; a flow deflector connection section is provided between the downward pressing helical blade and the upward lifting helical blade, and the flow deflector connection section has an overflow window.

7. The resin mixing device with controllable proportioning according to claim 1, characterized in that, The lower opening of the receiving sleeve is provided with an elastic scraping ring surrounding the central passage. The elastic scraping ring can slide in contact with the outer edge of the reversing mixing rotor during the upward process. The outer periphery of the follower discharge piston is provided with a wall-scraping sealing ring. The upper part of the follower discharge piston is provided with a central venting protrusion corresponding to the central passage and a guide slope extending from the central venting protrusion to the outer periphery. The batch feed port is located on the upper side wall of the closed mixing chamber and corresponds to the upper area of ​​the guide slope. When the follower discharge piston reaches the upper limit position, the central venting protrusion extends into the lower part of the central passage.

8. The resin mixing device with controllable proportioning according to claim 1, characterized in that, It also includes a mechanical phase switching assembly located near the upper cover. The mechanical phase switching assembly includes a switching component having a metering position, a mixing position, and a feeding position; a first mechanical limiting component connected to the lifting seat of the mixing shaft; a second mechanical limiting component linked to the lower limit position of the follow-up discharge piston; and a feeding stop component cooperating with the discharge passage of the two metering chambers. The switching component is also linked to the opening and closing end of the feeding valve located at the batch feeding port. The switching component is provided with a feeding limiting groove. When the reversing mixing rotor has not reached the receiving position, the first mechanical limiting component extends into the feeding limiting groove to prevent the switching component from entering the feeding position. When the follow-up discharge piston has not returned to the lower limit position, the second mechanical limiting component prevents the switching component from returning to the metering position.

9. The resin mixing device with controllable proportioning according to claim 8, characterized in that, When the switching component is in the metering position, the feeding valve is closed, the follow-up discharge piston is held at the lower limit position, and the discharge passages of the two metering chambers are open; when the switching component is in the mixing position, the feeding stopper closes the discharge passages of the two metering chambers, the feeding valve remains closed, and the reversing mixing rotor is located in the closed mixing chamber; when the switching component is in the feeding position, the reversing mixing rotor is located in the receiving sleeve, the feeding valve is open, and the follow-up discharge piston can move upward.

10. The resin mixing device with controllable proportioning according to claim 1, characterized in that, The constant volume metering component, the closed mixing chamber, the mixing mechanism, and the discharge mechanism together constitute a batch mixing unit, and two batch mixing units are arranged in parallel. The batch feed ports of the two batch mixing units are respectively connected to the first feed port and the second feed port of the batch switching valve, and the common discharge port of the batch switching valve is connected to the main feed pipe. The batch switching valve is equipped with a pressure equalization bypass and a differential pressure limiting device. The pressure equalization bypass is used to connect the batch mixing unit to be supplied with the main feed pipe before the main feed path is switched. The differential pressure limiting device is used to restrict the switching valve core from switching the main feed path when the pressure difference between the side to be supplied and the main feed pipe is greater than a set value.

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