Material continuous, constant flow bidirectional switching control method, control valve and pouring head

Abstract

The present application relates to material continuous addition technical field, especially material continuous, flow constant bidirectional switching control method, control valve and pouring head, the control method includes: discharge: the drive assembly drives the valve core assembly of return flow part side action to its complete cut-off material return flow, the material pressure in the feed channel overcomes the force of the pressure assembly and makes the valve core assembly located in the discharge part move to the return flow part direction to the material flow out from the discharge port of the discharge part; Switching: the drive assembly switches the valve core assembly of the discharge part side action to its complete cut-off material discharge, the material pressure in the feed channel overcomes the force of the pressure assembly and makes the valve core assembly located in the return flow part move to the discharge part direction to the material flow out from the return flow port of the return flow part; by the pressure assembly simultaneously acting on two valve core assemblies, while matching the same size of the two sides of the cut-off seat, solve the problem of the initial discharge ratio inaccuracy leading to defective products in the prior art when material is continuously added.

Description

Technical Field

[0001] This invention relates to the field of flow control valve technology, and in particular to a bidirectional switching control method for continuous material flow and constant flow, a control valve, and a pouring head. Background Technology

[0002] In the continuous casting process of polyurethane, multiple materials need to be continuously mixed, and the mixed materials are poured into the mold one by one to achieve continuous production.

[0003] In existing technologies, such as Figure 1 As shown, the valve body 201 is provided with a feed channel 202 and a return channel 203. The feed channel is provided with a feed cut-off seat 204, and the return channel is provided with a return cut-off seat 205. The valve stem 206 passes through the return cut-off seat 205 to control the opening / closing of the feed cut-off seat 204 on the feed channel, thereby realizing the feeding and return of materials. However, because the valve stem passes through the return cut-off seat 205, the discharge area of ​​the feed cut-off seat 204 and the discharge area of ​​the return cut-off seat cannot be completely consistent, resulting in inconsistent discharge volumes. During the switching process for re-discharging, a pressure difference exists between the feed cut-off seat and the return cut-off seat, resulting in a flow deviation between the discharge volume at the moment of switching and the normal feeding discharge volume. This causes the material to over-rush or stagnate. For the quantitative continuous casting switching production process, the inconsistent ratio at the moment of switching leads to defective or scrap products. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a bidirectional switching control method for continuous material flow and constant flow. By simultaneously applying pressure to two sets of valve core assemblies, the valve core assemblies maintain a certain pressure on the throttling seat, achieving pressurized material output. Furthermore, the pressure in the second feed channels on both sides remains consistent, ensuring that the pressures P1 and P2 in the second channels are the same during switching. This avoids overshooting or stagnation of material during the switching process due to pressure differences, which would affect the instantaneous material addition. This invention also solves the problem in existing technologies where, during continuous quantitative addition of trace materials, the accurate proportioning during continuous discharge leads to instantaneous deviations in the switching process, resulting in defective products.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A bidirectional switching control method for continuous material flow and constant flow rate is characterized by comprising a valve body, wherein the valve body is provided with a material return section and a discharge section communicating with the feed channel, two sets of valve core assemblies for controlling the opening and closing of the return section and the discharge section respectively, and a pressurizing assembly acting on the two sets of valve core assemblies, wherein the valve core assemblies are controlled to reciprocate through a drive assembly; the method includes the following steps: Discharge: The drive assembly drives the valve core assembly on the reflux side to completely cut off the material reflux. The material pressure in the feed channel overcomes the force of the pressurizing assembly, causing the valve core assembly located in the discharge section to move towards the reflux section until the material flows out from the discharge port of the discharge section. Switching: The drive component switches the valve core assembly on the discharge side to completely cut off the material discharge. The material pressure in the feed channel overcomes the force of the pressurizing component, causing the valve core assembly located in the reflux section to move towards the discharge section until the material flows out from the reflux port of the reflux section.

[0006] As an improvement, both sets of valve core assemblies are subjected to the same force from the pressurizing assembly.

[0007] As an improvement, the material pressure in the feed channel is greater than the force exerted by the pressurizing component on the valve core component.

[0008] As an improvement, the pressurizing assembly includes an elastic element disposed between the two sets of valve core assemblies and in a compressed state.

[0009] As an improvement, the two sets of valve core assemblies are arranged in a linear symmetrical manner, and the two sets of valve core assemblies are squeezed simultaneously by the same elastic element.

[0010] As an improvement, the valve body is provided with a flow-blocking seat adapted to the corresponding valve core assembly. The flow-blocking seat is provided with a flow-blocking hole. The cross-sectional area of ​​the flow-blocking holes on both sides is equal, so that the discharge speed of the left and right flow-blocking seats is the same.

[0011] As an improvement, the material in the switching step flows out from the throttling seat, enters the material storage container through the circulation channel, and circulates the material to maintain a constant viscosity and temperature in the pipeline.

[0012] Another objective of this invention is to address the shortcomings of existing technologies by providing a bidirectional switching valve that ensures continuous material flow and constant flow. By simultaneously applying pressure to two sets of valve core assemblies, the valve core assemblies apply the same pressure to the flow-stopping seat, thereby making the minimum discharge pressure and the minimum return pressure essentially the same, ensuring constant flow discharge. At the same time, the discharge areas of the left and right flow-stopping seats are set to be the same, so as to achieve the same discharge and return speeds, avoiding fluctuations in discharge volume during the switching process caused by different speeds, which would affect continuous mixing production.

[0013] To achieve the above objectives, the present invention provides the following technical solution: A bidirectional switching valve for continuous material flow and constant flow rate, used to achieve the aforementioned bidirectional switching control method for continuous material flow and constant flow rate, includes: The valve body has a first feed channel and a second feed channel extending to both sides of the valve body. The valve core assembly has two sets, which are installed in the valve body. The two sets of valve core assemblies are used to change the on / off state of the outlet of the corresponding second feed channel respectively. A drive assembly that controls the switching movement of the two sets of valve core assemblies; The two valve core assemblies are respectively provided with the throttling seat on their outer sides, and the throttling seat is provided with a throttling hole that communicates with the second feed channel; And a pressurizing component, which acts simultaneously on two sets of valve core assemblies, so that the two sets of valve core assemblies act on their respective throttling seats with the same pressure.

[0014] As an improvement, the pressurization assembly includes an elastic element disposed between the two sets of valve core assemblies. As an improvement, the two sets of valve core assemblies are arranged in a linearly symmetrical manner.

[0015] As an improvement, the flow-cutting holes on the left and right flow-cutting seats are the same size.

[0016] As an improvement, it also includes a left end cover and a right end cover, which are respectively located at the left and right ends of the valve body. The left end cover has a reflux port, and the second feed channel is connected to the reflux port; the right end cover has a discharge port, and the right side second feed channel is connected to the discharge port.

[0017] As an improvement, the pressurization assembly further includes: Guide rod, the guide rod guides the elastic element; As an improvement, the pressurizing assembly further includes a pressure regulating sleeve for adjusting the pressure exerted by the valve core assembly on the throttle seat, the regulating sleeve being disposed between the valve core and the elastic element.

[0018] As an improvement, the pressure exerted by the pressurizing component on the valve core is greater than the pressure inside the mixing chamber.

[0019] As an improvement, the valve core assembly can be a one-piece molded structure or a split structure.

[0020] As an improvement, the valve core assembly with an integrally molded structure includes a needle valve a at the front end for blocking the flow-stopping seat and a sliding part a slidably disposed inside the valve body; the front end of the needle valve a has a conical structure.

[0021] As an improvement, the split-type valve core assembly includes: Sliding part b, which is slidably disposed in the valve body, with one end connected to the output end of the drive assembly; Needle valve b, one end of which is connected to the sliding part b, and the other end of which has a tapered structure for blocking the flow-blocking hole of the flow-blocking seat; An isolation seal, which is used to prevent liquid leakage and has a certain deformation capacity, is installed between the needle valve b and the sliding part b.

[0022] To address the shortcomings of existing technologies, this invention also provides a fluid casting head, including a mixing chamber. At least one set of bidirectional switching valves for continuous and constant flow of the aforementioned material is provided on the mixing chamber, and the pressure exerted by the pressurizing component on the valve core component is greater than the material pressure inside the mixing chamber.

[0023] The beneficial effects of this invention are as follows: (1) By setting an automatic compensation bidirectional switching cone valve, the present invention can achieve constant continuous addition of materials, ensure that the proportion of multi-component materials remains consistent during continuous mixing, and ensure that the instantaneous discharge amount of materials remains consistent with the discharge amount during continuous discharge during the reflux and discharge switching process.

[0024] (2) The present invention applies pressure to two sets of valve core assemblies simultaneously, so that the valve core assemblies apply the same pressure to the throttling seat, thereby making the minimum discharge pressure and the minimum return pressure the same, ensuring that the discharge volume at both ends is the same. At the same time, with the discharge area of ​​the left and right throttling seats being set to be the same, the discharge speed and return speed are the same, avoiding the fluctuation of discharge volume during the switching process caused by different speeds, which affects continuous mixing production.

[0025] (3) By setting up a reflux channel, the present invention enables the circulation of materials in the tank when the discharge is paused, so that the materials always maintain a stable viscosity and temperature, thereby increasing the discharge volume when the material is discharged.

[0026] (4) The present invention uses two sets of symmetrically arranged valve core assemblies, in conjunction with a set of pressurizing components, to ensure that the discharge pressure of the two sets of valve core assemblies is always consistent, thereby avoiding the problem that the instantaneous discharge volume and the continuous discharge volume are inconsistent due to the pressure difference between the two sides, and solving the problem of material over-rushing or stagnation.

[0027] (5) The present invention uses an elastic pressure component as an auxiliary thrust power for two sets of valve core components. Through the adaptive adjustment of the spring, the valve core is suitable for materials with different viscosities, ensuring that the discharge pressure and return pressure at both ends are consistent.

[0028] (6) The present invention achieves a fast response by quickly switching the drive components and using the force of the spring to achieve a fast response with virtually no time difference in the material discharge and recirculation switching process.

[0029] (7) By setting up the pressurization component, the present invention utilizes the characteristic of the spring compression force to maintain a constant pressure, thereby ensuring the stable outlet pressure of the metering pump and effectively compensating for the accuracy of the metering pump.

[0030] (8) By setting up multiple sets of automatic compensation bidirectional switching conical valves in conjunction with the mixing chamber, the present invention achieves synchronous discharge of multiple components without time difference, ensuring the accuracy of material ratio per unit time during the continuous mixing process of multiple components.

[0031] (9) By setting up a pressurizing component, the present invention achieves a pressure in the feeding channel that is greater than the pressure in the mixing chamber, thereby achieving pressurized discharge and avoiding backflow of materials in the mixing chamber.

[0032] (10) By setting up the pressurization component, the present invention uses springs to keep the two sets of valve core components against the flow cut-off seat in the shutdown state or waiting process, thus cutting off the material from contact with moisture in the air and preventing the material in the feed channel from contacting the air and causing a solidification reaction, which would cause the pipeline to be blocked.

[0033] In summary, the present invention has the advantages of constant proportion of multiple materials added continuously within a unit time and constant material output during the switching process. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the valve body structure in the prior art; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic axial sectional view of the present invention; Figure 5 This is a schematic diagram of the flow-stopping seat of the present invention; Figure 6 This is a schematic diagram of the structure of Embodiment 4 of the present invention; Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 8 This is a schematic diagram of the pouring head in Embodiment 7 of the present invention; Figure 9 This is a schematic diagram of Embodiment 1 of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] Example 1 like Figure 1-9 As shown, this embodiment provides a bidirectional switching control method for continuous material flow and constant flow rate, including a valve body 1. The valve body 1 contains a material return section and a discharge section communicating with the feed channel, two sets of valve core assemblies 2 that respectively control the opening and closing of the return section and the discharge section, and a pressurizing assembly 5 acting on the two sets of valve core assemblies 2. The valve core assemblies 2 are controlled to reciprocate via a drive assembly 3. The method includes the following steps: Discharge: The drive assembly 3 drives the valve core assembly 2 on the reflux side to completely cut off the material reflux. The material pressure in the feed channel overcomes the force of the pressurizing assembly, causing the valve core assembly 2 located in the discharge section to move towards the reflux section until the material flows out from the discharge port of the discharge section. Switching: The drive component 3 switches the valve core component 2 on the discharge side to completely cut off the material discharge. The material pressure in the feed channel overcomes the force of the pressurizing component, causing the valve core component 2 located in the reflux section to move towards the discharge section until the material flows out from the reflux port of the reflux section.

[0038] In this embodiment, the material pressure in the feed channel is greater than the force exerted by the pressurizing component on the valve core component 2.

[0039] The valve body 1 is provided with a flow-stopping seat 4 that is adapted to the corresponding valve core assembly 2. The flow-stopping seat 4 is provided with a flow-stopping hole 41. The cross-sectional area of ​​the flow-stopping holes 41 on both sides is equal, so that the discharge speed of the left and right flow-stopping seats is the same. Therefore, it can be ensured that the pressure at the left and right ends of the second feed channel is consistent during the discharge process, and the phenomenon of overshoot or delay during the switching process is avoided.

[0040] Preferably, the material in the switching step flows out from the interceptor seat 4, enters the material storage container through the circulation channel, and circulates the material to maintain a constant viscosity and temperature in the pipeline, thereby improving the accuracy of the material addition process and avoiding inconsistent material addition per unit time due to inconsistent viscosity, which would affect the quality of the continuously mixed production product.

[0041] Both sets of valve core assemblies 2 are subjected to the same force from the pressurizing component, and the material pressure in the feed channel is greater than the force exerted by the pressurizing component 5 on the valve core assembly 2.

[0042] It should be noted that in the discharge and switching steps, the valve core assemblies 2 on both sides are pushed outward by the force P3 of the pressurizing assembly, causing the valve core assemblies 2 on both sides to abut against the throttling seat 4 and maintain pressure P3. The pressure P1 of the material in the left second feed channel 12 and the pressure P2 of the material in the right second feed channel 12 are equal and greater than the force P3 of the pressurizing assembly, realizing pressurized material addition. At the same time, with the cross-sectional area of ​​the throttling holes 41 on both sides being equal, the pressure in the second feed channels on both sides remains consistent, ensuring that the pressure P1 and P2 in the second channel are the same during switching. This avoids the phenomenon of material overrushing or stagnation during the switching process due to pressure differences, which affects the instantaneous material addition amount. This solves the problem in the prior art where the initial discharge process ratio is inaccurate during continuous material addition, leading to the initial appearance of defective products.

[0043] As an improvement, the pressurizing component includes an elastic element 52, which is disposed between the two sets of valve core assemblies 2 and is in a compressed state. It should be noted that by having one elastic element 52 act on both sets of valve core assemblies 2, the force on both sets of valve core assemblies is made equal. Regardless of whether the elastic element 52 is new or has experienced a decrease in elasticity over time, the force exerted by the elastic element 52 on the two sets of valve core assemblies remains consistent. The elastic element 52 is preferably a spring.

[0044] As an improvement, the two sets of valve core assemblies 2 are arranged in a linear symmetrical manner, and the two sets of valve core assemblies 2 are simultaneously squeezed by the same elastic element 52.

[0045] Example 2 like Figures 2-4 As shown, this embodiment provides a bidirectional switching valve for continuous material flow and constant flow rate, used to implement the bidirectional switching control method for continuous material flow and constant flow rate described in Embodiment 1. The bidirectional switching valve includes: The valve body 1 has a first feed channel 11 and a second feed channel 12 extending to both sides of the valve body 1. The first feed channel 11 and the second feed channel 12 are connected. The device for adding material is connected to the inlet of the first feed channel 11. The outlets of the second feed channels 12 on both sides are respectively connected to the inlet of the mixing chamber 100 and the material return pipe. The first feed channel 11 is also equipped with a pressure regulating valve 8 to ensure that the material pressure in the first feed channel 11 is constant. Valve core assembly 2, wherein there are two sets of valve core assembly 2, and the two sets of valve core assembly 2 are installed in the valve body 1. The two sets of valve core assembly 2 are used to change the on / off state of the outlet of the corresponding second feed channel 12 respectively. Drive component 3 drives and controls the two sets of valve core assemblies 2 to switch and move; when drive component 3 drives the corresponding valve core assembly 2 to move outward, the valve core assembly 2 blocks the corresponding throttling seat 4. The flow-stopping seat 4 is provided on the outer side of the two sets of valve core assemblies 2 respectively. The flow-stopping seat 4 is provided with a flow-stopping hole 41 that communicates with the second feed channel 12. The end of the valve core assembly 2 is adapted to the flow-stopping hole 41 to control the material flow or block it. Preferably, the flow-stopping hole 41 is preferably a conical structure, and its outlet diameter is smaller than its inlet diameter. And pressurizing component 5, which acts on two sets of valve core assemblies 2 simultaneously, so that the two sets of valve core assemblies 2 act on the corresponding cut-off seats 4 with the same pressure; when the driving component 3 limits the valve core assembly 2 on one side, the valve core assembly 2 quickly abuts against and blocks the corresponding cut-off seat 4. At this time, the valve core assembly 2 on the other side is acted on by the pressurizing component 5 to keep it abutting against and blocking the corresponding cut-off seat 4 until the pressure in the second feed channel 12 connected to it is greater than the force of the pressurizing component 5. Then, the valve core assembly 2 quickly separates from the corresponding cut-off seat 4, allowing the material to flow out from the cut-off hole 41 on the cut-off seat 4.

[0046] In this embodiment, the drive assembly 3 is preferably located in the hollowed-out cavity 13 inside the valve body 1 and between the two sets of valve core assemblies 2. Of course, according to the design requirements, the drive assembly 3 can also be located outside the valve body 1, such as setting two sets of drive cylinders outside the valve body 1 and cooperating with the push rod assembly to drive the two sets of valve core assemblies 2 to move alternately. It should be noted that, preferably, the two sets of valve core assemblies 2 and the corresponding flow-stopping seats 4 in this invention are completely identical, or at least the outer ends of the two sets of valve core assemblies 2 are completely identical to the flow-stopping holes 41 opened in the corresponding flow-stopping seats 4. At the same time, the pressurizing component 5 is an elastic component. By simultaneously acting on the two sets of valve core assemblies 2, the discharge pressure of the two sets of valve core assemblies 2 is kept basically the same, so as not to affect the pressure fluctuation of the material in the first feed channel 11 and the second feed channel 12. This ensures that the flow rate is consistent when the material flows back through the inlet of the mixing chamber 100 or the material return pipe, and ensures that the material flow rate is consistent during the switching process. This avoids the inconsistency of left and right pressure in the second feed channel 12, which would lead to inconsistent instantaneous discharge during the switching process, affecting the deviation of the instantaneous feed rate per unit time, resulting in some products being defective or unqualified. For products manufactured continuously, this would affect the overall quality of the product.

[0047] Especially for casting equipment with continuous mixing and discharge, when multiple materials are being mixed, it is necessary to ensure that the multiple materials are continuously and stably discharged in a constant proportion. If the instantaneous discharge speed is inconsistent during the switching process, the proportion of the instantaneous discharge will be inconsistent, making it impossible to make accurate proportions, resulting in product scrap.

[0048] Especially for small products with quantitative, continuous, and frequent switching pouring processes, such as 10g-20g material products, in order to ensure product quality, the material at the front end needs to be poured out in the amount of 1-2 products. After the material ratio is stable, the pouring action is carried out, resulting in waste of product raw materials.

[0049] In addition, by setting up a material circulation channel, the viscosity and temperature of the material in the material storage container are kept consistent, thereby ensuring that the viscosity of the material is consistent during the discharge process, and guaranteeing that the material is discharged stably and uniformly during continuous switching of the discharge process.

[0050] In continuous production, several molds need to be poured continuously. During the interval between different molds, the material supply needs to be paused and the valve body 1 needs to be switched to the return channel to ensure the stability and uniformity of the material ratio when pouring the next mold.

[0051] Preferably, the two sets of valve core assemblies 2 are arranged linearly and symmetrically, and the two sets of valve cores are controlled by an elastic pressurizing component to ensure that the pressure of the two sets of valve cores remains consistent.

[0052] Furthermore, the choke holes 41 of the two choke seats 4 are the same size, ensuring that the backflow, feed flow rate and pressure remain constant, and ensuring the stability of continuous feed switching.

[0053] Preferably, the outlet of the liquid inlet interceptor 4 is connected to the side wall of the mixing chamber, and the outlet of the liquid return interceptor 4 is connected to the return pipe.

[0054] Furthermore, it also includes a left end cover 6 and a right end cover 7, which are respectively located at the left and right ends of the valve body 1. The left end cover 6 is provided with a reflux port 61, and the second feed channel 12 is connected to the reflux port 61. The right end cover 7 is provided with a discharge port 71, and the right side second feed channel 12 is connected to the discharge port 71.

[0055] Specifically, the left throttling seat 4 is located inside the left end cover 6, and the right throttling seat 4 is located outside the right end cover 7 and connected to the side wall of the mixing chamber; one end of the valve core assembly 2 passes through the right end cover 7, and the right end cover 7 is provided with a material channel 72. The material from the second feed channel 12 on the right side passes through the material channel 72 and the right throttling seat 4 into the mixing chamber.

[0056] Multiple material channels 72 are evenly distributed along the circumference of the right end cover 7, so that the material in the second feed channel 12 passes through the material channel 72 and flows out through the intercepting hole 41.

[0057] Example 3 like Figure 3 As shown, components that are the same as or corresponding to those in Embodiments 1 and 2 are represented by the same reference numerals as those in Embodiments 1 and 2. For simplicity, only the differences from Embodiments 1 and 2 are described below. The difference between Embodiment 3 and Embodiments 1 and 2 is that: In this embodiment, the pressurization component 5 includes: Guide rod 51 guides elastic element 52, so that elastic element extends / contracts smoothly; preferably, guide rod 51 is inserted into both ends of valve core assembly 2; of course, guide rod can also be provided at one end of the sliding part of valve core, and the elastic element is inserted and the valve core assembly 2 is positioned by the guide rods at both ends of valve core assembly. An elastic element 52 is sleeved on the guide rod 51; the elastic element 52 is located between the two sets of valve core assemblies 2; the elastic element 52 is in a compressed state, and when no external force is applied, the two sets of valve core assemblies 2 are pushed against the flow-stopping seat 4 by the elastic element 52, preventing external air and impurities from entering the valve body 1, cutting off the pipe blockage caused by the solidification reaction between the material and the moisture in the air, and reducing the equipment failure rate; the elastic element 52 is preferably a spring.

[0058] It should be noted that by setting up the pressurizing component 5, the unstable pressure in the second feed channels 12 on the left and right sides during the pouring process is avoided, which may cause the material to over-rush or stagnate, thus ensuring a constant output.

[0059] In addition, by setting up the pressurization component 5 and utilizing the compressive force of the elastic element 52, the outlet pressure of the metering pump is kept constant, which effectively compensates for the accuracy of the metering pump and also prevents the material in the mixing chamber from flowing back and back into the mixing chamber at the moment of feeding.

[0060] Furthermore, the present invention, through the setting of the pressurizing component 5, is applicable to materials with different viscosities and flow rates, has a wide range of applications, and can adaptively adjust according to the viscosity of different materials.

[0061] Furthermore, the pressurizing component 5 also includes a pressure regulating sleeve 53 for adjusting the pressure of the valve core assembly 2 acting on the throttling seat 4. The pressure regulating sleeve 53 is located between the valve core and the elastic element 52. By changing the height of the pressure regulating sleeve 53, the compression of the elastic element 52 is changed, thereby changing the elastic force of the elastic element 52, and thus changing the pressure of the valve core assembly 2 acting on the throttling seat 4.

[0062] Preferably, the force exerted by the pressurizing component 5 on the valve core component 2 is greater than the pressure inside the mixing chamber 100, so as to prevent the material in the mixing chamber 100 from entering the valve body 1; at the same time, during the filling process, the material pressure in the feed channel needs to be greater than the force exerted by the pressurizing component 5 to ensure that the material in the mixing chamber does not flow back during feeding.

[0063] It should be noted that by using the elastic element 52 in conjunction with the intermediate drive component 3, the material switching is achieved with virtually no time difference, ensuring a continuous, uniform, and stable supply of material proportions, thereby achieving continuous discharge, continuous mixing, and ensuring that the proportions remain consistent throughout the continuous discharge process.

[0064] In some embodiments, the pressurizing component 5 includes an elastic element 52, and two sets of valve core components 2 are provided with coaxial protrusions on opposite sides. The two ends of the elastic element 52 are respectively sleeved on the protrusions, and the elastic element 52 does not disengage from the valve core component 2 when the valve core component 2 switches.

[0065] Example 4 like Figure 7 As shown, components that are the same as or corresponding to those in Embodiments 1 to 3 are represented by the same reference numerals as those in Embodiments 1 to 3. For simplicity, only the differences from Embodiments 1 to 3 are described below. The difference between Embodiment 4 and Embodiments 1 to 3 is as follows: In this embodiment, the valve core assembly 2 is an integrally molded structure.

[0066] The valve core assembly 2 with an integrally molded structure includes a needle valve a21 at the front end for blocking the flow-stopping seat 4 and a sliding part a22 slidably disposed inside the valve body 1; the front end of the needle valve a21 has a conical structure.

[0067] It should be noted that the valve core assembly with an integrated molding structure achieves the compactness of the equipment, reduces the number of parts connected, and lowers the equipment failure rate.

[0068] Example 5 like Figure 6 As shown, components that are the same as or corresponding to those in Embodiments 1 to 4 are represented by the same reference numerals as those in Embodiments 1 to 4. For simplicity, only the differences from Embodiments 1 to 4 are described below. The difference between Embodiment 5 and Embodiments 1 to 4 is that: In this embodiment, the valve core assembly 2 is a split structure.

[0069] The split-type valve core assembly 2 includes: Sliding part b23, the sliding part b23 is slidably disposed in the valve body 1, and one end of it is connected to the output end of the drive assembly 3; Needle valve b24, one end of which is connected to the sliding part b23, and the other end of which has a conical structure, is used to block the flow-blocking hole 41 of the flow-blocking seat 4; And an isolation seal 25, which is used to prevent liquid leakage and has a certain deformation capability, is installed between the needle valve b24 and the sliding part b23.

[0070] The isolation seal 25 moves reciprocally with the needle valve b24 and the sliding part b23, preventing liquid from entering between the sliding part b23 and the valve body 1, thus preventing leakage and affecting the normal operation of the sliding part b23. It should be noted that the isolation seal 25 is preferably an isolation diaphragm, which is easily deformable, has certain corrosion resistance, and a long service life. Alternatively, a plug seal can be installed on the sliding part b23 or the needle valve b24 to achieve material isolation and sealing within the feed channel.

[0071] Example 6 like Figure 2 As shown, components that are the same as or corresponding to those in Embodiments 1 to 5 are represented by the same reference numerals as those in Embodiments 1 to 5. For simplicity, only the differences from Embodiment 2 are described below. The difference between Embodiment 6 and Embodiments 1 to 5 is that: In this embodiment, the driving component 3 includes: Cylinder seat 31, the cylinder seat 31 having two gas passages; the valve body 1 having a hollowed-out chamber 13 in the middle, the cylinder seat 31 being installed inside the chamber 13; and The cylinder piston 32 is slidably mounted on the cylinder seat 31, and its two ends alternately abut against and push the two sets of valve core assemblies 2 to move; through two gas channels, the cylinder piston 32 is alternately driven to reciprocate. The cylinder piston 32 has a hollow structure, and the pressurizing component 5 is placed inside the cylinder piston 32.

[0072] Example 7 like Figure 8 As shown, components that are the same as or corresponding to those in Embodiments 1 to 6 are referred to using the same reference numerals as those in Embodiments 1 to 6. For simplicity, only the differences from Embodiments 1 to 6 are described below. The difference between Embodiment 7 and Embodiments 1 to 6 is as follows: This embodiment provides a fluid pouring head, including a mixing chamber 100, on which at least one set of bidirectional switching valves as described in claim 8 or 9 are provided. The pressure exerted by the pressurizing component on the valve core component is greater than the material pressure in the mixing chamber, ensuring that the material in the mixing chamber does not backflow during the material addition process.

[0073] The material in this invention is in a fluid state, and multiple sets of bidirectional switching valves as described in the above embodiments, which are connected to the mixing chamber 100, can be set to realize the continuous and quantitative addition of various materials and the synchronous mixing and output.

[0074] Specifically, the working process of each set of bidirectional switching valves is as follows: When material needs to be supplied to the mixing chamber 100, the drive assembly 3 pushes the valve core assembly 2, which is close to the material return pipe, to move away from the mixing chamber 100, so that it fits tightly with the corresponding cut-off seat 4, thereby cutting off the material return channel. At the same time, when the pressure in the second feed channel 12, which is close to the mixing chamber 100, is greater than the force of the pressurizing assembly 5, the material flows out through the cut-off hole 41 on the cut-off seat 4 and enters the mixing chamber 100. Conversely, when material does not need to be supplied to the mixing chamber 100, the drive assembly 3 pushes the valve core assembly 2, which is close to the mixing chamber 100, to move away from the material return pipe, so that it fits tightly with the corresponding cut-off seat 4, thereby cutting off the material supply. At the same time, when the pressure in the second feed channel 12, which is close to the material return pipe, is greater than the force of the pressurizing assembly 5, the material flows out through the cut-off hole 41 on the cut-off seat 4 and enters the material return pipe to achieve material return.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bidirectional switching control method for continuous material flow and constant flow rate, characterized in that, The method includes a valve body, which contains a material return section and a discharge section communicating with the feed channel, two sets of valve core assemblies that control the opening and closing of the return section and the discharge section respectively, and a pressurizing assembly acting on the two sets of valve core assemblies. The valve core assemblies are controlled to reciprocate through a drive assembly. Includes the following steps: Discharge: The drive assembly drives the valve core assembly on the reflux side to completely cut off the material reflux. The material pressure in the feed channel overcomes the force of the pressurizing assembly, causing the valve core assembly located in the discharge section to move towards the reflux section until the material flows out from the discharge port of the discharge section. Switching: The drive component switches the valve core assembly on the discharge side to completely cut off the material discharge. The material pressure in the feed channel overcomes the force of the pressurizing component, causing the valve core assembly located in the reflux section to move towards the discharge section until the material flows out from the reflux port of the reflux section. The material is output under pressure, and the pressure in the second feed channels on both sides remains consistent.

2. The bidirectional switching control method for continuous material flow and constant flow rate according to claim 1, characterized in that, Both sets of valve core assemblies are subjected to the same force from the pressurizing assembly.

3. The bidirectional switching control method for continuous material flow and constant flow rate according to claim 1, characterized in that, The material pressure in the feed channel is greater than the force exerted by the pressurizing component on the valve core component.

4. The bidirectional switching control method for continuous material flow and constant flow rate according to any one of claims 1-3, characterized in that, The pressurization component includes an elastic element, which is disposed between the two sets of valve core assemblies and is in a compressed state.

5. The bidirectional switching control method for continuous material flow and constant flow rate according to claim 4, characterized in that, The two sets of valve core assemblies are arranged linearly and symmetrically, and are simultaneously compressed by the same elastic element.

6. The bidirectional switching control method for continuous material flow and constant flow rate according to any one of claims 1-3, characterized in that, The valve body is provided with a flow-blocking seat adapted to the corresponding valve core assembly. The flow-blocking seat has a flow-blocking hole. The cross-sectional area of ​​the flow-blocking holes on both sides is equal, so that the discharge speed of the left and right flow-blocking seats is the same.

7. The bidirectional switching control method for continuous material flow and constant flow rate according to any one of claims 1-3, characterized in that, The material in the switching step flows out from the interceptor seat, enters the material storage container through the circulation channel, and circulates the material to maintain a constant viscosity and temperature in the pipeline.

8. A bidirectional switching valve for continuous material flow and constant flow rate, used to implement the bidirectional switching control method for continuous material flow and constant flow rate as described in any one of claims 1-7, characterized in that, include: The valve body has a first feed channel and a second feed channel extending to both sides of the valve body. The valve core assembly has two sets, which are installed in the valve body. The two sets of valve core assemblies are used to change the on / off state of the outlet of the corresponding second feed channel respectively. A drive assembly that controls the switching movement of the two sets of valve core assemblies; The two valve core assemblies are respectively provided with the throttling seat on their outer sides, and the throttling seat is provided with a throttling hole that communicates with the second feed channel; And a pressurizing component, which acts simultaneously on two sets of valve core assemblies, so that the two sets of valve core assemblies act on their respective throttling seats with the same pressure.

9. A bidirectional switching valve for continuous material flow and constant flow rate according to claim 8, characterized in that, The pressurization component includes an elastic element, which is disposed between the two sets of valve core assemblies.

10. A bidirectional switching valve for continuous material flow and constant flow rate according to claim 8, characterized in that, The two sets of valve core assemblies are arranged in a linearly symmetrical manner.

11. A bidirectional switching valve for continuous material flow and constant flow rate according to claim 8, characterized in that, The drive assembly is located in a hollowed-out cavity inside the valve body.

12. A bidirectional switching valve for continuous material flow and constant flow rate according to claim 8, characterized in that, The flow-cutting holes on the left and right sides are the same size.

13. A fluid casting head, comprising a mixing chamber, characterized in that: The mixing chamber is provided with at least one set of bidirectional switching valves as described in any one of claims 8-12, which provide continuous material flow and constant flow rate, and the force exerted by the pressurizing component on the valve core component is greater than the material pressure in the mixing chamber.

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