Continuous material and constant flow bidirectional switching control method, control valve and pouring head

Abstract

The invention relates to the technical field of continuous material adding, in particular to a continuous material and constant flow two-way switching control method, a control valve and a pouring head. The control method comprises the steps that discharging is conducted, specifically, a driving assembly drives a valve element assembly on the backflow part side to act till material backflow is completely cut off; the pressure of materials in the feeding channel overcomes the acting force of the pressurizing assembly so that the valve element assembly located on the discharging part can move towards the backflow part till the materials flow out of a discharging opening of the discharging part. Switching: the driving assembly switches and drives the valve core assembly on the discharging part side to act until the valve core assembly completely cuts off material discharging, and the pressure of the materials in the feeding channel overcomes the acting force of the pressurizing assembly to enable the valve core assembly located on the backflow part to move towards the discharging part until the materials flow out from a backflow opening of the backflow part; the pressurizing assembly acts on the two valve element assemblies at the same time, and meanwhile the size of the intercepting bases on the two sides is the same, so that the problem that in the prior art, when materials are continuously added, the initial discharging proportion is not accurate, and consequently defective products appear is solved.

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 driving assembly drives the valve core assembly on the backflow part side to act to completely cut off the material backflow, the material pressure in the feeding channel overcomes the force of the pressurizing assembly to make the valve core assembly on the backflow part move to the discharge part direction to make the material flow out from the backflow port of the backflow part. Switching: the driving assembly switches to drive the valve core assembly on the discharge part side to act to completely cut off the material discharge, the material pressure in the feeding channel overcomes the force of the pressurizing assembly to make the valve core assembly on the backflow part move to the discharge part direction to make the material flow out from the backflow port of the backflow part.

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

[0007] As an improvement, the material pressure in the feeding channel is greater than the force of the pressurizing assembly on the valve core assembly.

[0008] As an improvement, the pressurizing assembly comprises an elastic member, which is arranged between the two groups of valve core assemblies and makes the elastic member in a compressed state.

[0009] As an improvement, the two groups of valve core assemblies are linearly symmetrically arranged and are simultaneously pressed by the same elastic member.

[0010] As an improvement, the valve body is respectively provided with a cut-off seat matched with the corresponding valve core assembly, the cut-off seat is provided with a cut-off hole, and the cross-sectional areas of the cut-off holes on the left and right sides are equal, so that the discharge speeds of the left and right cut-off seats are the same.

[0011] As an improvement, in the switching step, the material flows out from the cut-off seat, enters the material storage container through the circulation channel, circulates the material, and keeps the material in the pipeline constant in viscosity and temperature.

[0012] Another object of the present application is to provide a bidirectional switching valve with continuous material and constant flow, which simultaneously acts on the two groups of valve core assemblies through the pressurizing assembly, so that the valve core assemblies act on the cut-off seat with the same pressure, thereby making the minimum discharge pressure and the minimum backflow pressure basically the same, ensuring constant discharge, and at the same time, the discharge areas of the left and right cut-off seats are the same, realizing the same discharge and backflow speed, avoiding the fluctuation of the discharge amount in the switching process due to different speeds, and affecting the continuous mixing production.

[0013] To achieve the above object, the present application provides the following technical scheme: A bidirectional switching valve with continuous material and constant flow, which is used for realizing the bidirectional switching control method with continuous material and constant flow, comprising: A valve body, which is provided with a first feeding channel and a second feeding channel extending to both sides of the valve body; The valve core assembly is provided with two groups, two groups of valve core assemblies are installed in the valve body, and two groups of valve core assemblies are used to change the outlet on / off of the corresponding second feeding channel respectively; The driving assembly controls the switching movement of the two groups of valve core assemblies; The flow blocking seat is provided on the outer side of the two groups of valve core assemblies, and the flow blocking hole communicating with the second feeding channel is formed in the flow blocking seat; And the pressurizing assembly acts on the two groups of valve core assemblies at the same time, so that the two groups of valve core assemblies act on the corresponding flow blocking seats at the same pressure.

[0014] As an improvement, the pressurizing assembly comprises: an elastic member provided between the two groups of valve core assemblies As an improvement, the two groups of valve core assemblies are linearly symmetrically arranged.

[0015] As an improvement, the flow blocking holes of the left and right flow blocking seats are the same size.

[0016] As an improvement, it also includes a left end cover and a right end cover, which are respectively arranged at the left and right ends of the valve body, the left end cover is provided with a backflow port, and the second feeding channel communicates with the backflow port; the right end cover is provided with a discharge port, and the right side second feeding channel communicates with the discharge port.

[0017] As an improvement, the pressurizing assembly further comprises: A guide rod guides the elastic member; As an improvement, the pressurizing assembly further comprises a pressure adjusting sleeve for adjusting the pressure of the valve core assembly acting on the flow blocking seat, and the adjusting sleeve is arranged between the valve core and the elastic member.

[0018] As an improvement, the pressure of the pressurizing assembly acting on the valve core is greater than the pressure inside the mixing chamber.

[0019] As an improvement, the valve core assembly is an integrated structure or a split structure.

[0020] As an improvement, the valve core assembly of the integrated structure includes a needle valve a at the front end for blocking the flow blocking seat and a sliding part a slidingly arranged in the valve body; the front end of the needle valve a is in a conical structure.

[0021] As an improvement, the split valve core assembly comprises: A sliding part b is slidingly arranged in the valve body, one end of which is connected with the output end of the driving assembly; A needle valve b is connected with the sliding part b at one end, and the other end of the needle valve b is in a conical structure for blocking the flow blocking hole of the flow blocking seat; And an isolation seal is installed between the needle valve b and the sliding part b to prevent liquid leakage and has a certain deformation capacity.

[0022] The present application also provides a fluid pouring head, which comprises a mixing chamber, and at least one set of the above-mentioned material continuous and flow constant bidirectional switching valve is arranged on the mixing chamber.

[0023] The present application has the following advantages: (1) The present application can realize material constant continuous addition by setting the automatic compensation bidirectional switching cone valve, and ensures that the ratio remains consistent when the multi-component material is continuously mixed, and the instantaneous discharge amount of the material remains consistent with the discharge amount when continuously discharging during the backflow and discharge switching process.

[0024] (2) The present application simultaneously acts on the two valve core assemblies by the pressurizing assembly, so that the valve core assemblies act on the cut-off seats with the same pressure, thereby making the minimum discharge pressure and the minimum backflow pressure the same, ensuring that the discharge amounts of the two ends are the same, and at the same time, the discharge area of the left and right two cut-off seats is the same, realizing the same discharge speed and backflow speed, avoiding the existence of fluctuations in the discharge amount during the switching process due to different speeds, and affecting the continuous mixing production.

[0025] (3) The present application realizes the circulation of the material in the tank when the discharge is paused by setting the backflow channel, so that the material always maintains stable viscosity and temperature, thereby improving the discharge amount when discharging.

[0026] (4) The present application realizes that the discharge pressures of the two valve core assemblies always remain consistent by the two sets of symmetrically arranged valve core assemblies cooperating with a set of pressurizing assembly, avoiding the problem that the instantaneous discharge amount when discharging is inconsistent with the discharge amount when continuously discharging due to the pressure difference on both sides, and solving the phenomenon of overshoot or hysteresis of the material.

[0027] (5) The present application uses the elastic pressurizing assembly as the auxiliary thrust power of the two valve core assemblies, and through the self-adaptive adjustment of the spring, the valve core is suitable for materials with different viscosities, and the discharge pressures and backflow pressures of the two ends are consistent.

[0028] (6) The present application realizes that there is basically no time difference in the discharge and backflow switching process by the rapid switching of the driving part and the action force of the spring, and ensures rapid response.

[0029] (7) The present application uses the constant characteristic of the compression force of the spring to ensure the horizontal stability of the outlet pressure of the metering pump, thereby effectively compensating the precision of the metering pump.

[0030] (8) The present application realizes multi-component non-time difference synchronous discharge by setting multiple sets of automatic compensation bidirectional switching conical valves cooperating with mixing chambers, so as to ensure the precision of material proportioning in unit time in the continuous mixing process of multi-component materials.

[0031] (9) The present application realizes that the pressure of the feeding channel is greater than the pressure in the mixing chamber by setting the pressurizing assembly, realizes pressure discharge, and avoids the backflow of materials in the mixing chamber.

[0032] (10) The present application realizes that the two sets of valve core assemblies are always abutted on the intercepting seat by the spring in the stop state or waiting process, so as to cut off the contact between the materials and the moisture in the air, avoid the solidification reaction of the materials in the feeding channel caused by the contact with the air, and cause pipeline blockage.

[0033] In summary, the present application has the advantages of constant proportioning in unit time in the continuous addition of multiple materials, constant material discharge in the switching process, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a schematic diagram of the valve body structure of the prior art; Figure 2 It is a schematic diagram of the overall structure of the present application; Figure 3 It is a schematic diagram of the present application; Figure 4 It is a schematic diagram of the shaft side section of the present application; Figure 5 It is a schematic diagram of the intercepting seat of the present application; Figure 6 It is a schematic diagram of the structure of the fourth embodiment of the present application; Figure 7 It is a schematic diagram of the structure of the third embodiment of the present application; Figure 8 It is a schematic diagram of the overall structure of the pouring head in the seventh embodiment of the present application; Figure 9 It is a schematic diagram of the first embodiment of the present application. DETAILED DESCRIPTION

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

[0036] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0037] Embodiment one As Figures 1-9 shown, the present embodiment provides a continuous and constant flow bidirectional switching control method for materials, which comprises a valve body 1, a material backflow part and a discharge part in the valve body 1, two groups of valve core assemblies 2 respectively controlling the on-off of the backflow part and the discharge part, and a pressurizing assembly 5 acting on the two groups of valve core assemblies 2, wherein the valve core assemblies 2 are controlled to reciprocate by a driving assembly 3; the method comprises the following steps: Discharge: the driving assembly 3 drives the valve core assembly 2 on the backflow part side to act to completely cut off the material backflow, and the material pressure in the feeding channel overcomes the action force of the pressurizing assembly to make the valve core assembly 2 located in the discharge part move to the backflow part direction to flow out of the material from the discharge port of the discharge part; Switching: the driving assembly 3 switches to drive the valve core assembly 2 on the discharge part side to act to completely cut off the material discharge, and the material pressure in the feeding channel overcomes the action force of the pressurizing assembly to make the valve core assembly 2 located in the backflow part move to the discharge part direction to flow out of the material from the backflow port of the backflow part.

[0038] In the present embodiment, the material pressure in the feeding channel is greater than the action force of the pressurizing assembly on the valve core assembly 2.

[0039] The valve body 1 is respectively provided with a cut-off seat 4 adapted to the corresponding valve core assembly 2, and the cut-off seat 4 is provided with a cut-off hole 41, and the cross-sectional areas of the cut-off holes 41 on both sides are equal, so that the discharge speeds of the left and right two cut-off seats are the same, thereby ensuring that the pressures at the left end and the right end of the second feeding channel remain consistent during the discharge process, and avoiding the phenomenon of overshoot or hysteresis during the switching process.

[0040] Preferably, the material in the switching step flows out from the intercepting seat 4, enters the material storage container through the circulation channel, circulates the material, keeps the viscosity and temperature of the material in the pipeline constant, improves the accuracy in the material adding process, avoids the inconsistency of the material adding amount per unit time caused by the inconsistency of the viscosity, and affects the quality of the continuously mixed production product.

[0041] The two groups of valve core assemblies 2 are subjected to the same force of the pressurizing assembly, and the pressure of the material in the feeding channel is greater than the force of the pressurizing assembly 5 on the valve core assembly 2.

[0042] It should be noted that in the discharging step and the switching step, the two valve core assemblies 2 on both sides are pushed outward by the force P3 of the pressurizing assembly, so that the two valve core assemblies 2 on both sides abut against the intercepting seat 4 and keep the pressure P3. The pressure P1 of the material in the left second feeding channel 12 and the pressure P2 of the material in the right second feeding channel 12 are equal and greater than the force P3 of the pressurizing assembly, so that the material is added under pressure. At the same time, the cross-sectional areas of the intercepting holes 41 on both sides are equal, so that the pressures in the second feeding channels on both sides are kept consistent, the pressures P1 and P2 in the second channels are the same during switching, the over-shooting or lagging phenomenon of the material during switching is avoided, the instantaneous material adding amount is affected, and the problem that the initial discharging process is not accurate in the prior art, resulting in initial defective products, is solved.

[0043] As an improvement, the pressurizing assembly includes an elastic member 52, which is arranged between the two groups of valve core assemblies 2 and is in a compressed state. It should be noted that the force acting on the two groups of valve core assemblies 2 by one elastic member 52 is equal, and whether the elastic member 52 is new or has a decreased elasticity after being used for a period of time, the force acting on the two groups of valve core assemblies by the elastic member 52 can always be kept consistent. The elastic member 52 is preferably a spring.

[0044] As an improvement, the two groups of valve core assemblies 2 are linearly and symmetrically arranged, and are simultaneously pressed by the same elastic member 52.

[0045] Embodiment Two As shown in Figures 2-4 The embodiment provides a material continuous and flow constant bidirectional switching valve for realizing the material continuous and flow constant bidirectional switching control method in embodiment one, and the bidirectional switching valve comprises: Valve body 1, the first inlet channel 11 and the second inlet channel 12 extending to both sides of the valve body 1 are opened on the valve body 1, the first inlet channel 11 communicates with the second inlet channel 12; the inlet of the first inlet channel 11 is connected with the material adding device; the outlets of the second inlet channels 12 on both sides are respectively connected with the inlets of the mixing chambers 100 and the material backflow pipelines; the first inlet channel 11 is further provided with a constant pressure valve 8 to ensure that the material pressure in the first inlet channel 11 is constant; Valve core assembly 2, the valve core assembly 2 is provided with two groups, two groups of valve core assemblies 2 are installed in the valve body 1, and the two groups of valve core assemblies 2 are used for respectively changing the on / off of the outlets of the corresponding second inlet channels 12; Driving assembly 3, the driving assembly 3 drives the control of the switching movement of the two groups of valve core assemblies 2; when the driving assembly 3 drives the corresponding valve core assembly 2 to move outward, the valve core assembly 2 blocks the corresponding intercepting seat 4; Intercepting seat 4, the outer sides of the two groups of valve core assemblies 2 are respectively provided with the intercepting seats 4, the intercepting holes 41 communicating with the second inlet channels 12 are opened on the intercepting seats 4, and the end portions of the valve core assemblies 2 are adapted to the intercepting holes 41 to control the material outflow or blockage; preferably, the intercepting holes 41 are preferably conical structures, and the outlet end diameter is smaller than the inlet end diameter; And pressurizing assembly 5, the pressurizing assembly 5 simultaneously acts on the two groups of valve core assemblies 2, so that the two groups of valve core assemblies 2 respectively act on the corresponding intercepting seats 4 with the same pressure; when the driving assembly 3 limits one side of the valve core assembly 2, the valve core assembly 2 quickly abuts against the corresponding intercepting seat 4, at this time, the valve core assembly 2 on the other side is acted on by the pressurizing assembly 5 to keep abutting against the corresponding intercepting seat 4; when the pressure in the second inlet channel 12 communicated with the corresponding intercepting seat 4 is greater than the acting force of the pressurizing assembly 5, the valve core assembly 2 quickly separates from the corresponding intercepting seat 4 to make the material flow out of the intercepting hole 41 on the intercepting seat 4.

[0046] In this embodiment, the driving assembly 3 is preferably arranged in the hollow cavity 13 formed in the valve body 1 and located between the two valve core assemblies 2. Of course, according to the design requirements, the driving assembly 3 can also be arranged outside the valve body 1, for example, two driving cylinders are arranged outside the valve body 1 and cooperate with the push rod assembly to drive the two valve core assemblies 2 to act alternately. It should be noted that the two valve core assemblies 2 and the corresponding flow blocking seats 4 in the present application are preferably completely identical, or at least the outer end of the two valve core assemblies 2 and the flow blocking hole 41 formed in the corresponding flow blocking seat 4 are completely identical. At the same time, the pressurizing assembly 5 is an elastic assembly, which simultaneously acts on the two valve core assemblies 2, so that the discharge pressure of the two valve core assemblies 2 remains basically the same, thereby not affecting the pressure fluctuation of the materials in the first feeding channel 11 and the second feeding channel 12, so as to ensure that the flow rate is consistent when the materials flow through the inlet of the mixing chamber 100 or flow back through the material return pipeline, and ensure that the flow rate is consistent during the switching process, thereby avoiding the inconsistent pressure in the second feeding channel 12, which leads to inconsistent discharge amount during the switching process, affects the deviation of the feeding amount per unit time, and causes some products to be defective or unqualified, which affects the quality of the entire product for continuous production and manufacturing.

[0047] In particular, for the continuous mixing and discharging pouring equipment, when multiple materials are mixed, it is necessary to ensure that the multiple materials are continuously and stably discharged at a constant ratio. If the instantaneous discharging speed is inconsistent during the switching process, the ratio of the instantaneous discharging is inconsistent, accurate ratio cannot be achieved, and the product is scrapped.

[0048] Especially for small product quantification, continuous and frequent switching pouring process, such as 10g-20g material product, in order to ensure product quality, the front-end material needs to be discharged, and the amount of 1-2 products is discharged, and after the material ratio is stable, the pouring action is performed, causing waste of product raw materials.

[0049] In addition, by arranging the material circulation channel, the viscosity and temperature of the materials in the material storage container are kept consistent, so as to realize the consistency of the viscosity of the materials during the discharging process and ensure the stable and uniform discharging of the materials during the continuous switching discharging process.

[0050] In the continuous production process, it is necessary to continuously pour several molds, and during the switching interval of different molds, the feeding needs to be paused, the valve body 1 needs to be switched to the return channel, and the stability and uniformity of the material ratio during the next mold pouring are ensured.

[0051] Preferably, the two valve core assemblies 2 are linearly and symmetrically arranged, and an elastic pressurizing assembly is used to control the two valve cores, so as to ensure that the pressure of the two 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 of the integrated structure comprises a needle valve a21 for plugging the flow blocking seat 4 at the front end and a sliding part a22 slidingly arranged in the valve body 1; the front end of the needle valve a21 is in a conical structure.

[0067] It should be noted that the integrated valve core assembly realizes the compactness of the device, reduces the connection of parts, and reduces the failure rate of the device.

[0068] Example five As Figure 6 shown, wherein the same or corresponding parts as in examples one to four use corresponding reference numerals in examples one to four, for the sake of simplicity, only the difference points with examples one to four are described below. The difference between this example five and examples one to four is that: In this embodiment, the valve core assembly 2 is of a split structure.

[0069] The split valve core assembly 2 comprises: A sliding part b23 is slidingly arranged in the valve body 1, one end of which is connected with the output end of the driving assembly 3; A needle valve b24, one end of which is connected with the sliding part b23, the other end of which is in a conical structure for plugging the flow blocking hole 41 of the flow blocking seat 4; And an isolation sealing element 25 is installed between the needle valve b24 and the sliding part b23 for preventing liquid leakage and has a certain deformation capacity.

[0070] The isolation sealing element 25 moves back and forth with the needle valve b24 and the sliding part b23, preventing liquid from entering between the sliding part b23 and the valve body 1, causing leakage and affecting the normal operation of the sliding part b23; it should be noted that the isolation sealing element 25 is preferably an isolation diaphragm, which is easy to deform, has certain corrosion resistance, long service life and other advantages. Of course, a pan seal sleeve can also be selected to be arranged on the sliding part b23 or the needle valve b24 to realize the isolation sealing of the material in the feeding channel.

[0071] Example six As Figure 2 shown, wherein the same or corresponding parts as in examples one to five use corresponding reference numerals in examples one to five, for the sake of simplicity, only the difference points with example two are described below. The difference between this example six and examples one to five is that: In this embodiment, the driving assembly 3 comprises: A cylinder seat 31 is provided with two gas channels; a hollow chamber 13 is arranged in the middle of the valve body 1, and the cylinder seat 31 is installed in 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 method for continuous, constant flow, bi-directional switching control of material, characterized in that, The valve body is provided with a material backflow part and a discharge part in communication with the feeding channel, two valve core assemblies for controlling the opening and closing of the backflow part and the discharge part respectively, and a pressurizing assembly acting on the two valve core assemblies, and the valve core assemblies are controlled to reciprocate by a driving assembly The method comprises the following steps: Discharge: the driving assembly drives the valve core assembly on the backflow part side to act to completely cut off the material backflow, and the material pressure in the feeding channel overcomes the force of the pressurizing assembly to make the valve core assembly on the discharge part side move to the backflow part side to discharge the material from the discharge port of the backflow part; Switching: the driving assembly drives the valve core assembly on the discharge part side to act to completely cut off the material discharge, and the material pressure in the feeding channel overcomes the force of the pressurizing assembly to make the valve core assembly on the backflow part side move to the discharge part side to discharge the material from the backflow port of the backflow part.

2. The continuous, constant flow, bi-directional switching control method of claim 1, wherein, The two valve core assemblies are subjected to the same force of the pressurizing assembly.

3. The method for continuous, constant flow bi-directional switching control of material according to claim 1, wherein, The material pressure in the feeding channel is greater than the force of the pressurizing assembly on the valve core assembly.

4. The method for continuous, constant flow, bi-directional switching control of material according to any one of claims 1-3, characterized in that, The pressurizing assembly comprises an elastic member, which is arranged between the two valve core assemblies and is in a compressed state.

5. The method of claim 4, wherein, The two valve core assemblies are linearly and symmetrically arranged and are simultaneously pressed by the same elastic member.

6. The method for continuous, constant flow, bi-directional switching control of material according to any one of claims 1-3, wherein, The valve body is provided with a cut-off seat corresponding to each valve core assembly, and the cut-off seat is provided with a cut-off hole, and the cross-sectional areas of the cut-off holes on the two sides are equal, so that the discharge speeds of the two cut-off seats are the same.

7. The method for continuous, constant flow, bi-directional switching control of material according to any one of claims 1-3, wherein, In the switching step, the material flows out of the cut-off seat, enters the material storage container through the circulation channel, circulates the material, and keeps the viscosity and temperature of the material in the pipeline constant.

8. A continuous flow bi-directional switching valve for implementing the continuous flow bi-directional switching control method according to any one of claims 1 to 7, characterized in that, It comprises: A valve body provided with a first feeding channel and a second feeding channel extending to both sides of the valve body, and a hollow chamber in the valve body; Two valve core assemblies linearly arranged in the valve body, and used for changing the opening and closing of the corresponding second feeding channel; A driving assembly arranged in the hollow chamber; A cut-off seat arranged on the outer side of each valve core assembly and provided with a cut-off hole in communication with the second feeding channel; And a pressurizing assembly acting on both valve core assemblies to make them act on the corresponding cut-off seats with the same pressure.

9. A continuous flow bi-directional switching valve according to claim 8, wherein, The pressurizing assembly comprises an elastic member arranged between the two valve core assemblies.

10. A fluid dispensing head comprising a mixing chamber, characterized by: The mixing chamber is provided with at least one bidirectional switching valve with continuous and constant flow according to claim 8 or 9, and the force of the pressurizing assembly on the valve core assembly is greater than the material pressure in the mixing chamber.

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