A booster valve plate special for injection molding machine and a control method thereof

Abstract

The application relates to a special booster valve plate for an injection molding machine and a control method thereof. The valve plate comprises a valve body, a turnover support and a limiting assembly. In view of the problem that the installation point of a functional valve in a compact hydraulic system is blocked by a base, so that the integrity of a hydraulic circuit must be damaged during maintenance, a support structure with vertical lifting and lateral turnover functions is designed. The valve body is integrated with multiple oil ports and sensors; the turnover support is connected with the valve body through a rotating pair, and a booster valve and a booster quick valve are vertically lifted along a guide cylinder by driving a screw rod at the top. The action cooperates with a positioning head with a conical part and a conical groove of the valve body, converts a traditional planar compression seal into a conical embedded seal. The limiting assembly guarantees the posture stability of the turnover support under impact working conditions through multiple physical locking. The open operation of the valve plate base mounting hole is realized under the premise that the hydraulic pipeline is not completely separated, the seal ring shear wear is eliminated by vertical feeding, and the interference problem between structure maintenance and circuit sealing is solved.

Description

Technical Field

[0001] This invention belongs to the technical field of pressure boosting valve plates, and relates to a pressure boosting valve plate for injection molding machines and its control method. Background Technology

[0002] As the core equipment for plastic molding and processing, the performance of the mold closing and pressurization system of the injection molding machine directly determines the molding accuracy, production efficiency and service life of the plastic parts. Among them, the pressurization valve plate is the key hub connecting the hydraulic power source (such as the pressurization pump or the mold transfer pump) and the actuator (such as the pressurization cylinder). It mainly undertakes the functions of pressure regulation, flow distribution, direction switching and system protection of the pressurization oil circuit. It is the core component that ensures the stable and accurate execution of the mold closing and pressurization process.

[0003] As the injection molding industry moves towards higher precision, higher efficiency, and lower maintenance costs, existing injection molding machine pressure booster valve plates are gradually revealing numerous technical defects, making it difficult to meet actual production needs. Specific problems are as follows:

[0004] The injection molding cycle is long and the production efficiency is low. Existing pressure boosting valve plates mostly rely on a single pressure boosting pump for oil supply, lacking a combined oil flow design. This results in a long time for the pressure to climb from the initial value to the required process value (e.g., 14 MPa). Pressure relief during the mold opening stage is achieved through a single pressure relief valve or natural pressure relief, which is slow and requires waiting for the oil pressure to drop to a safe range (e.g., 20 bar) before the pressure boosting cylinder can reset. This inefficiency in pressure boosting and depressurization directly prolongs the injection molding cycle, reduces the number of times the injection molding machine can produce per unit time, and makes it difficult to meet the high-efficiency production requirements of large-volume plastic parts.

[0005] Traditional booster valve plates have a slow pressure relief structure. When the oil circuit experiences overpressure due to valve core jamming or pump malfunction, they cannot open for pressure relief in time, which can easily lead to safety accidents such as valve bursting and oil circuit damage. At the same time, the valve plate's fixing and limiting structure is simple in design. High-frequency vibration during machine operation can easily cause the valve to loosen or shift, which can damage the oil circuit's on / off accuracy. This not only affects the boosting effect but also accelerates valve wear and shortens the overall service life of the booster valve plate.

[0006] In the integrated design of injection molding machine hydraulic systems, the booster valve plate, as the core unit of power distribution, requires the integration of high-density hydraulic control components within a limited space. To achieve a compact layout, the structural mounting holes connecting the valve plate base to the frame are often located below the projections of functional components such as booster valves and quick-release valves. This layout leads to a serious maintenance logic conflict: when it is necessary to tighten the entire valve plate, replace gaskets, or relocate it, the hydraulic functional valve assembly above must first be completely removed.

[0007] This disassembly introduces two technical drawbacks: First, frequent disconnections of the hydraulic circuit expose the precision valve core directly to the workshop environment, making it highly susceptible to dust or metal debris contamination, which can cause the spool valve to jam. Second, traditional valve plates use a planar static seal, relying on bolt preload to maintain surface contact. Under the high-frequency impact vibration of the injection molding machine's mold closing and pressurization, slight misalignment can occur between the valve body and valve components. Repeated disassembly and reassembly can further scratch the sealing surface, leading to persistent leakage due to decreased surface flatness.

[0008] Therefore, a pressure boosting valve plate and its control method specifically for injection molding machines are proposed to solve the problems mentioned above. Summary of the Invention

[0009] In view of this, the present invention is mainly intended to solve the technical problems of existing compact valve plates requiring forced disconnection of the hydraulic circuit when maintaining the base structure, which increases the risk of system contamination, and traditional planar seals failing due to the lack of a centering compensation mechanism under repeated disassembly and vibration conditions. To solve these problems, a flip-up bracket mechanism is designed to facilitate direct exposure of the mounting holes without removing the valve components. This is based on observing the production line maintenance process and avoiding the introduction of additional fault sources by complex pneumatics.

[0010] Furthermore, to improve boosting efficiency, a confluence valve is added to allow oil to flow in parallel, which is logically based on the principle of parallel operation of hydraulic systems, shortening the pressure rise time without increasing pump power; the pressure relief valve, along with pressure sensor I and pressure sensor II, provides real-time monitoring and rapid response, which is based on safety engineering considerations, ensuring overpressure protection and optimizing mold opening sequence.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a pressure boosting valve plate for injection molding machines, comprising: a valve body, wherein one end of the valve body is fixedly provided with an oil return port, a large system to small system interface and a pressure boosting pump oil inlet, and the top is sequentially fixedly provided with a confluence valve, a pressure boosting quick valve, a pressure boosting valve and a high pressure mold closing oil circuit pressure regulating valve, the other end is fixedly provided with a pressure sensor I and a pressure relief valve, the back side is provided with an inlet and return port I and an inlet and return port II, and the top is provided with four mounting holes;

[0012] The flip-up bracket includes two fixed frames, a rotating shaft, two rotating frames, and a mounting base. The two fixed frames are fixedly installed on the top of the valve body. The rotating shaft passes through the fixed frames. The rotating frames are sleeved on the rotating shaft and rotate synchronously with the rotating shaft. The mounting base is fixed between the two rotating frames. Nut ring I and nut ring II are fixedly provided on the top of the mounting base. Screw I and screw II are threadedly connected to nut ring I and nut ring II, respectively. The bottom ends of screw I and screw II are respectively connected to the pressure boosting valve and the pressure boosting quick valve through bearing II and bearing I, respectively.

[0013] A limiting component, comprising a support rod and an insert rod, wherein the support rod is integrally formed with the fixing frame and has a hollow top, and the insert rod is slidably inserted into the hollow structure of the support rod, and an insertion hole adapted to the insert rod is provided on one side of the rotating frame;

[0014] The rotating bracket can expose the mounting hole by rotating around the pivot, allowing the bolts inside the mounting hole to be operated without disassembling the booster valve or the booster valve. The rotation of screws I and II can drive the booster valve and the booster valve to approach the valve body to achieve a seal. Pressure sensor I is used to monitor the pressure of the booster oil circuit.

[0015] As a further improvement to the above technical solution:

[0016] The limiting component also includes a fixing ring and a spring. The fixing ring is interference-fitted onto the outer wall of the insertion rod and located inside the hollow structure of the support rod. The spring is fitted onto the outer wall of the insertion rod, with its two ends respectively abutting against the inner wall of the support rod and one side of the fixing ring.

[0017] In its natural state, the spring pushes the insert rod into the insertion hole, achieving the initial limit of the rotating frame and preventing the rotating frame from accidentally overturning when the valve plate is working.

[0018] The limiting component also includes an internal threaded ring and an external threaded collar. The internal threaded ring is fixedly installed on the side of the support rod away from the fixed ring, and the external threaded collar is threadedly connected to the outer wall of the insertion rod and is adapted to the internal threaded ring.

[0019] When the insert rod is inserted into the insertion hole, the engagement of the external threaded collar and the internal threaded collar can lock the position of the insert rod, thereby enhancing the reliability of the limit.

[0020] One end of the insertion rod extends outward from the support rod and a round handle is fixedly provided at the end. The outer wall of the handle is provided with anti-slip texture.

[0021] The anti-slip texture prevents operators' hands from slipping when they are wet with hydraulic oil, making it easier to pull the lever to unlock the limit position.

[0022] The pressure boosting valve is threaded with a guide cylinder I in the mounting hole at the top, and a guide cylinder II is threaded with a guide cylinder II in the mounting hole at the top. The guide cylinders I and II are slidably inserted into the mounting base, and a limit ring I and a limit ring II are fixedly provided at the top respectively.

[0023] Among them, guide cylinder I and guide cylinder II provide guidance for the movement of the booster valve and the booster valve, preventing the valve from moving off course. Limiting ring I and limiting ring II can prevent guide cylinder I and guide cylinder II from falling off the mounting base.

[0024] The outer walls of both guide cylinder I and guide cylinder II are chrome-plated.

[0025] Among them, chrome plating can improve the surface hardness and wear resistance of guide cylinder I and guide cylinder II, and reduce sliding friction loss with the mounting base.

[0026] The working port of the booster valve and the booster valve are both threaded with positioning heads. The bottom end of the positioning head is provided with a tapered part. The top of the valve body is provided with a tapered groove at the position corresponding to the booster valve and the booster valve. The tapered part and the tapered groove are adapted to each other.

[0027] The tapered part embedded in the tapered groove can achieve precise positioning of the booster valve, the booster valve and the valve body, avoiding oil leakage due to concentricity deviation.

[0028] The outer wall of the positioning head is fitted with a sealing gasket, which is made of nitrile rubber.

[0029] When the conical part is embedded in the conical groove, the sealing gasket is compressed and forms a sealing surface between the positioning head and the valve body. The nitrile rubber material can resist the erosion of hydraulic oil and extend the sealing life.

[0030] The valve body is fixedly equipped with a booster oil flow regulating valve I, a booster oil flow regulating valve II, and a pressure sensor II. The booster oil flow regulating valve I and the booster oil flow regulating valve II are respectively connected to the oil circuits of the booster quick valve and the booster valve. The pressure sensor II is connected to the oil circuit of the inlet and outlet I.

[0031] Among them, the booster oil circuit flow regulating valve I and the booster oil circuit flow regulating valve II can independently regulate the flow of the corresponding oil circuit, and the pressure sensor II is used to monitor the return oil circuit pressure to achieve comprehensive monitoring of the oil circuit pressure.

[0032] A control method for a pressure booster valve plate for injection molding machines as described above includes the following steps:

[0033] S1. Real-time monitoring of the pressure in the booster oil circuit and return oil circuit via pressure sensor I and pressure sensor II;

[0034] S2. When mold closing and pressurization are required, the control system controls the opening of the confluence valve according to the pressure data, so that the oil in the mold moving system and the oil in the pressurization system merge to increase the pressurization speed.

[0035] S3. Control the pressurization quick valve and pressurization valve to open and close in sequence to realize the action of high pressure stage one and high pressure stage two until the mold closing pressure reaches the process set value.

[0036] S4. When the oil circuit pressure exceeds the preset safety value of the pressure relief valve, the pressure relief valve will automatically open to relieve pressure.

[0037] S5. When opening the mold, control the pressure relief valve to open for rapid pressure relief. After the pressure drops to a safe range, control the booster pump to drive the booster valve and the booster quick valve to reset.

[0038] The beneficial effects of this invention are as follows:

[0039] 1. This invention, through a screw-driven vertical lifting mechanism combined with a conical positioning structure, changes the traditional sealing contact method of valve components. By utilizing the embedded fit between the conical part and the conical groove, the sealing pressure is transformed from simple axial compression to a circumferential fit with automatic centering capability. This design not only eliminates concentricity deviations during installation, but more importantly, during valve reset, the sealing gasket is pressed in vertically rather than sliding horizontally, avoiding the risk of seal ring breakage due to shear force in traditional installation methods, and significantly improving sealing durability under high-pressure conditions.

[0040] 2. This invention, through the flip-up bracket, allows operators to move the entire booster valve assembly out of the work area while maintaining the basic connection between the hydraulic lines and valve body components (only disconnecting the working port), directly exposing the mounting holes at the bottom. This "non-disconnect" maintenance greatly reduces the probability of the hydraulic system's internal components being exposed to external contamination, protecting the precision valve core, and significantly reducing downtime caused by disassembling and assembling pipelines.

[0041] 3. This invention employs a combined active and passive strategy for pressure boosting and depressurization control, along with mechanical limiters to ensure system rigidity. The multi-level locking of the limiter components ensures the absolute stillness of the tilting bracket under the strong vibrations of the injection molding machine, preventing the conical sealing surface from loosening due to slight bracket movement. Combined with a dual-channel rapid pressure relief and flow merging design, this improves system response speed while utilizing the stability of the physical structure to ensure the accuracy and safety of high-pressure control.

[0042] 4. The pressure boosting valve plate disclosed in this invention is specifically designed for injection molding machines. The pressure boosting system of the valve plate is independent, enabling synchronous operation. The valve plate is compact and easy to install and remove, facilitating after-sales maintenance in case of any abnormalities (and pressure gauges and sensors are installed in the pressure boosting pipeline for easy observation of the oil circuit). The design allows the mold transfer system to access the pressure boosting system, increasing the pressure boosting speed, shortening the pressure boosting cycle, and achieving rapid pressure boosting. A system check valve is installed between the mold transfer system and the pressure boosting system to prevent high-pressure impact on the mold transfer system, protecting it. A rapid pressure boosting oil circuit is also designed for more effective and rapid pressure build-up, shortening the working cycle. This system includes a film-breaking pressure relief oil circuit and uses a dual-channel oil circuit for rapid pressure relief, shortening the mold opening cycle. A safety valve is designed in the pressure boosting system pipeline to protect the entire system (because the pressure boosting cylinder in the direct-pressure mold closing mechanism is large, it is necessary to maximize machine speed and shorten the production cycle; therefore, the oil circuit system must include a rapid oil circuit and a rapid pressure relief oil circuit to improve machine efficiency).

[0043] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0045] Figure 1 This is a three-dimensional structural schematic diagram of a pressure booster valve plate for injection molding machines according to the present invention;

[0046] Figure 2 This is a three-dimensional structural schematic diagram of a pressure booster valve plate for injection molding machines from another perspective, according to the present invention.

[0047] Figure 3 This is a schematic diagram of the flip-up bracket structure of a pressure booster valve plate for injection molding machines according to the present invention;

[0048] Figure 4 This is a schematic diagram of the opening structure of the flip-up bracket of a pressure booster valve plate for injection molding machines according to the present invention;

[0049] Figure 5 This is a schematic diagram of the connection structure between the flip bracket of the injection molding machine-specific pressure boosting valve plate and the pressure boosting quick valve and pressure boosting valve according to the present invention;

[0050] Figure 6 This is a schematic diagram of the guide cylinder I, guide cylinder II, and mounting base of a pressure booster valve plate for injection molding machines according to the present invention;

[0051] Figure 7 This is a schematic diagram of the fixing frame and rotating frame structure of a pressure booster valve plate for injection molding machines according to the present invention;

[0052] Figure 8 This is a cross-sectional view of the limiting component of a pressure booster valve plate for injection molding machines according to the present invention;

[0053] Figure 9 This is a schematic diagram of the positioning head and valve body structure of a pressure booster valve plate for injection molding machines according to the present invention;

[0054] Figure 10 This is a diagram of the oil circuit system of a pressure booster valve plate for injection molding machines according to the present invention.

[0055] Reference numerals: 1. Valve body; 101. Mounting hole; 102. Conical groove; 103. Pressure sensor I; 2. Confluence valve; 3. Return port; 4. Interface between large system and small system; 5. Booster pump inlet; 6. Booster oil circuit flow regulating valve I; 7. Booster quick valve; 71. Guide cylinder I; 72. Limit ring I; 8. Booster valve; 81. Guide cylinder II; 82. Limit ring II; 9. High-pressure mold closing oil circuit pressure regulating valve; 10. Pressure relief valve; 11. Booster oil circuit flow regulating valve II; 12. Inlet / outlet I; 13. Inlet / outlet II; 14. Pressure sensor II; 15. Flip bracket; 151. Fixing bracket; 152. Rotating shaft; 153. Rotating bracket; 1531. Insertion hole; 154. Mounting base; 155. Nut ring I; 156. Screw I; 157. Nut ring II; 158. Screw II; 159. Bearing I; 160. Bearing II; 16. Limiting assembly; 161. Support rod; 162. Insert rod; 163. Fixing ring; 164. Spring; 165. Internal threaded ring; 166. External threaded collar; 17. Positioning head; 171. Tapered part; 18. Sealing gasket. Detailed Implementation

[0056] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0057] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0058] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. Example 1

[0059] like Figure 1-10 As shown, a pressure boosting valve plate for injection molding machines is disclosed in this embodiment. This pressure boosting valve plate for injection molding machines aims to solve the problems of insufficient sealing reliability, inconvenient maintenance and disassembly, and low pressure control accuracy of existing pressure boosting valve plates for injection molding machines. The following describes it in detail with specific structural details and operation process.

[0060] The valve body 1 is made of QT450-10 ductile iron, a material with excellent impact resistance and resistance to hydraulic oil corrosion, capable of withstanding frequent pressure fluctuations and long-term contact with hydraulic oil during injection molding machine operation. The valve body 1 has a rectangular structure with a phosphated surface, which not only improves rust prevention but also reduces oil contamination, facilitating daily cleaning and maintenance. At one end of the valve body 1 along its length, there is a return port 3, a large system to small system interface 4, and a booster pump inlet 5. The inner wall of each interface is chamfered to prevent scratching the sealing ring during oil pipe installation and to guide the oil pipe into place quickly. The inner wall of the interface also has an annular sealing groove into which an O-ring can be embedded. The sealing ring is made of fluororubber, offering excellent high and low temperature resistance, adapting to oil temperature changes during injection molding machine operation, and effectively preventing hydraulic oil leakage.

[0061] At the top of valve body 1, along its length, are sequentially fixed a booster oil flow regulating valve I6, a booster quick valve 7, a booster valve 8, and a high-pressure mold closing oil pressure regulating valve 9. All four valves are bolted to the mounting surface at the top of valve body 1. Each valve has a sealing groove at its bottom where it contacts the mounting surface of valve body 1. An O-ring is placed in the groove, and the compression of the O-ring is precisely controlled to ensure reliable sealing without over-compression that could damage the surface of valve body 1 or the O-ring, thus preventing a decline in sealing performance after prolonged use.

[0062] At the other end face along the length of valve body 1, a pressure relief valve 10 and a pressure sensor I 103 are fixed. The pressure relief valve 10 adopts a spring-loaded structure, and its opening pressure is preset. When the pressure in the oil circuit exceeds this value, the pressure relief valve 10 can automatically open to relieve pressure, preventing damage to valve components or rupture of the oil circuit due to overpressure. The pressure sensor I 103 is connected to the threaded hole on the end face of valve body 1 through a thread. The threaded hole is connected to the pressurization oil circuit inside valve body 1, which can monitor the pressure data in the oil circuit in real time and transmit the data to the control system of the injection molding machine. The control system adjusts the action of each valve component according to the pressure data to ensure the accuracy of the pressurization process.

[0063] A confluence valve 2 is fixed to the front side of valve body 1. Confluence valve 2 is an electromagnetic directional valve; during operation, it controls the valve core to switch oil circuits by energizing or de-energizing, achieving the merging of oil in the mold-moving system and the pressurization system, thus accelerating the pressurization speed. Confluence valve 2 is bolted to a flat surface on the front side of valve body 1. This surface is precision-machined with high flatness to ensure a seamless fit between confluence valve 2 and valve body 1 after installation, reducing the risk of leakage. A pressurization oil circuit flow regulating valve II11 and a pressure sensor II14 are fixed to the rear side of valve body 1. Pressurization oil circuit flow regulating valve II11 has the same structure as pressurization oil circuit flow regulating valve I6, allowing independent adjustment of the flow rate of different oil circuit branches to meet the flow requirements under different system operating conditions. Pressure sensor II14 is installed on the rear side of valve body 1 to monitor pressure changes in the return oil circuit, promptly detecting problems such as blockage or leakage in the return oil circuit.

[0064] On the back side of valve body 1, there are inlet / outlet I 12 and inlet / outlet II 13. The structure of the two ports is the same as that of return port 3. The inner wall is also provided with chamfers and sealing grooves, which are used to connect to other oil circuit branches of the injection molding machine to realize the circulation and return of oil and ensure smooth oil flow in the entire hydraulic system. At the four corners of the top of valve body 1, there is a mounting hole 101 for fixing the entire booster valve plate to the mounting bracket of the injection molding machine with bolts. The position design of the mounting hole 101 ensures that the valve plate is evenly stressed after fixing and avoids valve plate displacement due to vibration during machine operation.

[0065] The flip bracket 15 is located on top of the valve body 1, above the booster valve 7 and the booster valve 8. It includes two fixed brackets 151, a rotating shaft 152, two rotating brackets 153, and a mounting base 154. The two fixed brackets 151 are made of aluminum alloy, with a lightweight design that facilitates subsequent flipping operations, while also having sufficient strength to support the overall weight of the flip bracket 15. The fixed brackets 151 are fixed to the top of the valve body 1 with bolts. The bolt connection method facilitates later disassembly and maintenance. If the fixed bracket 151 is damaged, it can be replaced individually without replacing the entire valve body 1.

[0066] Each fixed bracket 151 has a through hole on the side near the rotating bracket 153. The rotating shaft 152 passes through the through holes of two fixed brackets 151. The rotating shaft 152 and the through holes of the fixed brackets 151 are fitted with an interference fit, which ensures that the rotating shaft 152 can rotate freely without significant shaking, and ensures that the rotating bracket 153 rotates smoothly and without jamming around the rotating shaft 152. The rotating bracket 153 is sleeved on both ends of the rotating shaft 152 and is fitted with an interference fit, which ensures that the rotating bracket 153 and the rotating shaft 152 rotate synchronously and avoids relative slippage between them. The rotation angle of the rotating bracket 153 is limited to a certain range to prevent it from colliding with surrounding valves or other components during rotation, and to protect the components from damage.

[0067] Mounting base 154 is fixed between two rotating frames 153. It is made of steel plate and has high structural strength, which can withstand the force when the screw is adjusted. The two ends of mounting base 154 are welded to the two rotating frames 153 respectively. Argon arc welding is used for welding. The weld is dense and free of pores to prevent hydraulic oil from seeping into the weld and causing corrosion. After welding, the weld points are ground to remove sharp edges to prevent operators from being scratched during maintenance. At the same time, it ensures that the surface of mounting base 154 is flat and does not affect the installation of subsequent components.

[0068] The top of the mounting base 154 is stepped and fixed with nut rings I155 and II157. Both nut rings are made of steel, possessing good wear resistance and capable of withstanding long-term friction from the screw threads. Nut rings I155 and II157 are fixed to the mounting base 154 by welding. Before welding, the surface of the mounting base 154 is derusted to ensure a tight weld and prevent the nut rings from loosening during use. Screws I156 and II158 are threaded into nut rings I155 and II157 respectively. The screws are made of high-strength steel and have a rust-proof surface treatment to prevent corrosion from prolonged exposure to air. The top of the screws is machined with a hexagonal head, allowing operators to easily turn the screws with a wrench without the need for special tools, reducing operational difficulty.

[0069] The bottom of screw II158 is equipped with bearing I159, which is a deep groove ball bearing. This type of bearing has a simple structure and runs smoothly, effectively reducing the frictional resistance when the screw rotates, and converting the rotational motion of the screw into the linear motion of the booster valve 7, ensuring that the booster valve 7 moves smoothly without jamming. The inner ring of bearing I159 and the bottom end of screw II158 are interference-fitted to ensure that the two rotate synchronously and avoid wear caused by relative sliding. The outer ring of bearing I159 is fixed to the top mounting surface of the booster valve 7 by bolts. The bolts are evenly distributed to ensure that the bearing is under balanced force and avoid bearing damage due to uneven force.

[0070] Similarly, the bottom end of screw I 156 is provided with bearing II 160. The structure and installation method of bearing II 160 are the same as those of bearing I 159. Its outer ring is fixed to the top mounting surface of pressure boosting valve 8 by bolts, ensuring that when screw I 156 rotates, it can drive pressure boosting valve 8 to move smoothly closer to or away from valve body 1, thereby adjusting the position of pressure boosting valve 8 and ensuring the sealing effect between pressure boosting valve 8 and valve body 1, avoiding oil leakage due to displacement of pressure boosting valve 8. After flipping, pressure boosting quick valve 7 and pressure boosting valve 8 can be moved away at the same time to operate the bolt in mounting hole 101.

[0071] The limiting component 16 is mounted on the flip bracket 15 to fix the position of the mounting base 154. It includes a support rod 161, an insertion rod 162, a fixing ring 163, a spring 164, an internal threaded ring 165, and an external threaded collar 166. The support rod 161 is integrally formed with the fixing bracket 151 and is made of the same aluminum alloy material as the fixing bracket 151. The integral forming design eliminates the splicing gap between the support rod 161 and the fixing bracket 151, avoiding corrosion caused by hydraulic oil residue, and improving the overall structural strength. The top of the support rod 161 is a hollow structure. The inner wall of the hollow structure is precision machined and has a smooth surface, which reduces the frictional resistance when the insertion rod 162 moves, ensuring smooth operation of the insertion rod 162.

[0072] The insertion rod 162 is inserted into the hollow structure at the top of the support rod 161. It is made of high-strength steel and has sufficient rigidity to prevent bending and deformation during use. One end of the insertion rod 162 extends out of the outside of the support rod 161. The end of this end is machined with a round handle with anti-slip texture, which makes it easy for the operator to push or pull the insertion rod 162 by hand. Even if the hands are covered with hydraulic oil, it is not easy to slip. The other end of the insertion rod 162 can be inserted into the insertion hole 1531 opened on one side of the rotating frame 153. The inner wall of the insertion hole 1531 is polished to ensure that the insertion rod 162 can be smoothly inserted or pulled out without jamming.

[0073] A fixing ring 163 is fixedly sleeved on the outer wall of the insertion rod 162. The fixing ring 163 and the insertion rod 162 are fixed together by welding to ensure that they move synchronously and do not slip relative to each other. The fixing ring 163 is located in the hollow structure at the top of the support rod 161 and can limit the spring 164 to prevent the spring 164 from shifting. A spring 164 is also sleeved on the outer wall of the insertion rod 162. In its natural state, the spring 164 is in a slightly compressed state, which can generate a pushing force on the fixing ring 163 in the direction of the rotating frame 153, thereby pushing the insertion rod 162 to automatically insert into the insertion hole 1531, realizing the initial limiting of the rotating frame 153 and preventing the rotating frame 153 from rotating accidentally during machine operation.

[0074] The outer wall of the insertion rod 162 is also threaded with an external threaded collar 166, which is made of steel and has good wear resistance. An internal threaded collar 165 is fixed on the outer wall of the support rod 161 on the side away from the fixing ring 163. The internal thread of the internal threaded collar 165 matches the external thread of the external threaded collar 166. When the insertion rod 162 is inserted into the insertion hole 1531, the external threaded collar 166 is rotated to engage with the internal threaded collar 165, which can further lock the position of the insertion rod 162 and prevent the insertion rod 162 from coming out of the insertion hole 1531 due to vibration during the rotation of the rotating frame 153, ensuring the reliability of the limit. At the same time, the threaded connection makes unlocking easy. The operator only needs to rotate the insertion rod 162 in the opposite direction to pull the insertion rod 162.

[0075] A mounting hole is provided on the top of the booster valve 7, and a guide cylinder I 71 is threaded into the mounting hole. The guide cylinder I 71 is made of steel and its surface is chrome-plated. The chrome plating layer can improve the surface hardness and wear resistance of the guide cylinder I 71, reduce friction and wear with the guide hole of the mounting seat 154, and extend its service life. The guide cylinder I 71 passes through the guide hole opened on the mounting seat 154. The inner wall of the guide hole is smooth and is clearance-fitted with the guide cylinder I 71 to ensure that the guide cylinder I 71 can slide up and down along the guide hole, providing guidance for the movement of the booster valve 7, avoiding deviation when the booster valve 7 moves, and ensuring its docking accuracy with the valve body 1.

[0076] A limiting ring I72 is fixed to the top of the guide cylinder I71. The limiting ring I72 is made of steel and is fixed to the top of the guide cylinder I71 by spot welding. After spot welding, the strength of the weld is checked to ensure that the limiting ring I72 will not fall off. The diameter of the limiting ring I72 is larger than the diameter of the guide hole on the mounting base 154, which can prevent the guide cylinder I71 from falling out of the guide hole. At the same time, it can also limit the vertical movement range of the mounting base 154, avoid excessive pressure of the mounting base 154 causing damage to the sealing gasket 18, and protect the sealing assembly.

[0077] Similarly, a guide cylinder II 81 is threaded into the mounting hole at the top of the booster valve 8. The guide cylinder II 81 is made of the same material and has the same surface treatment as the guide cylinder I 71. It passes through the corresponding guide hole on the mounting base 154 to provide guidance for the movement of the booster valve 8. A limit ring II 82 is fixed at the top of the guide cylinder II 81. The structure and installation method of the limit ring II 82 are the same as those of the limit ring I 72, which serves to prevent the guide cylinder II 81 from coming out and to limit the movement range of the mounting base 154.

[0078] Positioning heads 17 are threaded into the working ports of both the booster valve 7 and the booster valve 8. The positioning heads 17 are made of stainless steel, which has good corrosion resistance and can prevent rust caused by long-term contact with hydraulic oil. The outer wall of the positioning head 17 is machined with threads to facilitate connection with the working port. At the same time, the threaded connection method facilitates disassembly and replacement. If the positioning head 17 is worn, it can be replaced separately, reducing maintenance costs. The bottom end of the positioning head 17 is provided with a tapered part 171. The surface of the tapered part 171 is precision machined and has a low roughness to ensure a good fit with the valve body 1. On the top of the valve body 1, a tapered groove 102 is provided at the position corresponding to the working port of the booster valve 7 and the booster valve 8. The taper of the tapered groove 102 is consistent with the taper of the tapered part 171 at the bottom end of the positioning head 17. When the booster valve 7 and the booster valve 8 are close to the valve body 1, the tapered part 171 can be embedded in the tapered groove 102 to achieve precise positioning and ensure that the working port is aligned with the oil passage inside the valve body 1. This avoids poor oil flow due to concentricity deviation, which would affect the boosting efficiency.

[0079] A sealing gasket 18 is also fitted on the outer wall of the positioning head 17. The sealing gasket 18 is made of nitrile rubber, which has excellent oil resistance. It will not expand, age or deform after long-term contact with hydraulic oil, ensuring long-term stable sealing performance. The thickness of the sealing gasket 18 is designed so that when the conical part 171 is embedded in the conical groove 102, the sealing gasket 18 is compressed to a suitable degree, which can form a reliable seal between the positioning head 17 and the valve body 1, preventing hydraulic oil from leaking from the working port and the mating point of the valve body 1. At the same time, it avoids excessive compression that could damage the sealing gasket 18, thus extending the service life of the sealing gasket 18.

[0080] During actual installation, the special booster valve plate for injection molding machines is fixed to the mounting bracket of the injection molding machine through the mounting hole 101 on the top of the valve body 1. When fixing, tighten the bolts evenly to avoid uneven force on the valve plate and deformation. Fix each valve component to the valve body 1 with bolts according to the above position. Before installation, clean the surface of the valve body and the bottom of the valve components to remove impurities and oil stains to ensure tight fit. Then install the booster valve 7 and booster valve 8 on the mounting base 154.

[0081] Then, fix the fixing bracket 151 of the flip bracket 15 to the top of the valve body 1. When fixing, ensure that the fixing bracket 151 is aligned to avoid jamming when the rotating bracket 153 rotates. Rotate the rotating bracket 153 to move the booster valve 7 and the booster valve 8 to the top of the valve body 1. Then, rotate the insert rod 162 in the opposite direction to rotate the external threaded collar 166 to disengage from the internal threaded collar 165. The insert rod 162 is inserted into the insertion hole 1531 of the rotating bracket 153 under the force of the spring 164 to ensure that the flip bracket 15 is firmly fixed.

[0082] Then, rotate screws I 156 and II 158 to move the pressure boosting valve 7 and pressure boosting valve 8 downwards. During the movement, observe the alignment of the positioning head 17 with the conical groove 102 until the conical part 171 of the positioning head 17 is embedded in the conical groove 102 of the valve body 1. The sealing gasket 18 is compressed to achieve a seal. The whole process relies on the guidance and limiting of the mechanical structure, without relying on the operator's manual experience, ensuring the consistency of the sealing state after each maintenance.

[0083] During operation, the injection molding machine's booster pump delivers hydraulic oil to valve body 1 through booster pump inlet 5. After entering valve body 1, the hydraulic oil is regulated by booster oil circuit flow regulating valve I6 and booster oil circuit flow regulating valve II11 to control the oil flow to meet the needs of different working conditions. When it is necessary to accelerate the boosting speed, the confluence valve 2 is energized and opened to introduce the oil from the mold moving system into the boosting system, realizing oil confluence and improving boosting efficiency. The boosting quick valve 7 and booster valve 8 are based on the pressure data transmitted by pressure sensor I103 and pressure sensor II14. Under the control of the control system, the system opens or closes in an orderly manner to realize the actions of the high-pressure stage 1 and high-pressure stage 2, ensuring that the mold closing pressure accurately meets the production requirements. When the pressure in the oil circuit exceeds the preset value of the pressure relief valve 10, the pressure relief valve 10 automatically opens to release pressure, reducing the oil circuit pressure to a safe range and protecting the entire hydraulic system from overpressure damage. When the mold is opened, the pressure relief valve 10 opens to release pressure. After the pressure drops to the set value, the booster pump starts, driving the booster valve 8 and the booster quick valve 7 to reset, preparing for the next mold closing pressurization, and completing the entire work cycle.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pressure boosting valve plate specifically for injection molding machines, characterized in that, include: The valve body (1) has a return oil port (3), a large system to small system interface (4) and a booster pump inlet (5) fixed at one end. The top is fixed with a confluence valve (2), a booster fast valve (7), a booster valve (8) and a high pressure mold closing oil circuit pressure regulating valve (9). The other end is fixed with a pressure sensor I (103) and a pressure relief valve (10). The back side is provided with an inlet and return port I (12) and an inlet and return port II (13). The top is provided with four mounting holes (101). The flip bracket (15) includes two fixed brackets (151), a rotating shaft (152), two rotating brackets (153) and a mounting base (154). The two fixed brackets (151) are fixedly installed on the top of the valve body (1). The rotating shaft (152) passes through the fixed bracket (151). The rotating bracket (153) is sleeved on the rotating shaft (152) and rotates synchronously with the rotating shaft (152). The mounting base (154) is fixed between the two rotating brackets (153). Nut ring I (155) and nut ring II (157) are fixedly provided on the top of the mounting base (154). Nut ring I (155) and nut ring II (157) are respectively threaded with screw I (156) and screw II (158). The bottom ends of screw I (156) and screw II (158) are respectively connected to the pressure boosting valve (8) and the pressure boosting quick valve (7) through bearing II (160) and bearing I (159). The limiting component (16) includes a support rod (161) and a plug rod (162). The support rod (161) is integrally formed with the fixing frame (151) and the top is a hollow structure. The plug rod (162) slides through the hollow structure of the support rod (161). A plug hole (1531) adapted to the plug rod (162) is opened on one side of the rotating frame (153). By flipping the bracket (15), the operator can move the entire pressure boosting valve group out of the working area while maintaining the basic connection between the hydraulic pipeline and the valve body assembly, directly exposing the mounting hole at the bottom.

2. The injection molding machine-specific pressure boosting valve plate according to claim 1, characterized in that, The limiting component (16) also includes a fixing ring (163) and a spring (164). The fixing ring (163) is interference-fitted onto the outer wall of the insert rod (162) and located inside the hollow structure of the support rod (161). The spring (164) is fitted onto the outer wall of the insert rod (162), with its two ends abutting against the inner wall of the support rod (161) and one side of the fixing ring (163), respectively.

3. The injection molding machine-specific pressure boosting valve plate according to claim 2, characterized in that, The limiting component (16) also includes an internal threaded ring (165) and an external threaded collar (166). The internal threaded ring (165) is fixedly installed on the side of the support rod (161) away from the fixed ring (163). The external threaded collar (166) is threaded to the outer wall of the insertion rod (162) and is adapted to the internal threaded ring (165). When the insert rod (162) is inserted into the insertion hole (1531), the external threaded collar (166) and the internal threaded collar (165) engage to lock the position of the insert rod (162).

4. The injection molding machine-specific pressure boosting valve plate according to claim 3, characterized in that, One end of the insertion rod (162) extends outward from the outside of the support rod (161) and a round handle is fixedly provided at the end. The outer wall of the handle is provided with anti-slip texture.

5. The injection molding machine-specific pressure boosting valve plate according to claim 4, characterized in that, The pressure boosting valve (7) has a guide cylinder I (71) threadedly connected to the top mounting hole, and the pressure boosting valve (8) has a guide cylinder II (81) threadedly connected to the top mounting hole. The guide cylinder I (71) and the guide cylinder II (81) are slidably installed on the mounting base (154). The top of the guide cylinder I (71) and the guide cylinder II (81) are respectively fixed with a limiting ring I (72) and a limiting ring II (82).

6. The injection molding machine-specific pressure boosting valve plate according to claim 5, characterized in that, The outer walls of both guide cylinder I (71) and guide cylinder II (81) are chrome-plated.

7. The injection molding machine-specific pressure boosting valve plate according to claim 6, characterized in that, The working ports of the booster valve (7) and the booster valve (8) are threaded with positioning heads (17). The bottom end of the positioning head (17) is provided with a tapered part (171). The top of the valve body (1) is provided with a tapered groove (102) corresponding to the position of the booster valve (7) and the booster valve (8). The tapered part (171) and the tapered groove (102) are adapted to each other.

8. The injection molding machine-specific pressure boosting valve plate according to claim 7, characterized in that, The outer wall of the positioning head (17) is fitted with a sealing gasket (18), which is made of nitrile rubber. When the conical part (171) is embedded in the conical groove (102), the sealing gasket (18) is compressed and forms a sealing surface between the positioning head (17) and the valve body (1).

9. The injection molding machine-specific pressure boosting valve plate according to claim 8, characterized in that, The valve body (1) is fixedly provided with a booster oil flow regulating valve I (6), a booster oil flow regulating valve II (11) and a pressure sensor II (14) on the rear side. The booster oil flow regulating valve I (6) and the booster oil flow regulating valve II (11) are respectively connected to the oil circuits of the booster quick valve (7) and the booster valve (8), and the pressure sensor II (14) is connected to the oil circuit of the inlet and outlet I (12).

10. A control method applied to the injection molding machine-specific booster valve plate as described in claim 9, characterized in that, Includes the following steps: S1. The pressure of the booster oil circuit and the return oil circuit is monitored in real time by pressure sensor I (103) and pressure sensor II (14); S2. When mold closing and pressurization are required, the control system controls the opening of the confluence valve (2) according to the pressure data, so that the oil in the mold moving system and the oil in the pressurization system merge to increase the pressurization speed. S3. Control the pressure boosting valve (7) and the pressure boosting valve (8) to open and close in sequence to realize the action of the first high pressure stage and the second high pressure stage until the mold closing pressure reaches the process setting value. S4. When the oil circuit pressure exceeds the preset safety value of the pressure relief valve (10), the pressure relief valve (10) will automatically open to relieve pressure. S5. When the mold is opened, control the pressure relief valve (10) to open for rapid pressure relief. After the pressure drops to a safe range, control the booster pump to drive the booster valve (8) and the booster valve (7) to reset.

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