Horizontal two-plate direct compression type rubber injection machine

Abstract

The application discloses a horizontal two-plate straight-pressure type rubber injection machine, which comprises a rack, a fixed mold plate, a movable mold plate, guide columns, a quick mold locking oil cylinder, a high-pressure mold locking oil cylinder and a plug-in valve. The cylinder body of the high-pressure mold locking oil cylinder is fixedly connected with the movable mold plate or is integrally formed, the guide columns extend into the high-pressure mold locking oil cylinder, the piston of the high-pressure mold locking oil cylinder is fixedly connected with the guide columns and divides the high-pressure mold locking oil cylinder into a front cavity and a rear cavity. The plug-in valve is arranged in the tail cover of the high-pressure mold locking oil cylinder and is used for controlling the on-off between the front cavity and the rear cavity. The pilot valve of the plug-in valve is an electromagnetic directional valve, the plug-in valve is opened to make the front cavity and the rear cavity communicate and realize internal circulation of oil when the quick mold locking is performed, the plug-in valve is closed to make the front cavity establish high pressure when the high-pressure mold locking is performed, and the plug-in valve is opened to make the front cavity and the rear cavity communicate and realize internal recirculation of oil when the mold is opened. The rubber injection machine provided by the application is especially suitable for small and medium tonnage rubber injection machines and has the advantages of simple structure, low cost and good stability.

Description

Technical Field

[0001] This invention relates to the field of rubber injection molding equipment technology, specifically to a horizontal two-platen direct-pressure rubber injection machine. Background Technology

[0002] In compression molding equipment such as rubber injection molding machines, conventional two-platen horizontal machines typically use a brake and guide post annular groove engagement to fix the moving platen during high-pressure mold clamping. This structure has the following drawbacks: First, the guide post and brake require high machining precision, resulting in high manufacturing costs; second, the moving platen requires high displacement accuracy and repeatability, placing stringent demands on the control system; third, in small to medium tonnage rubber injection molding machines, this structure has low cost-effectiveness and poor stability.

[0003] In recent years, two-platen direct-pressure clamping structures have gradually attracted attention. For example, in traditional electro-hydraulic injection molding machines, the clamping cylinder body is fitted outside the tie rod and fixed to the moving platen, with the opening and closing of the front and rear cavities controlled by a cartridge valve. However, in this design, the clamping cylinder body and the moving platen are separate assembly structures (the cylinder body is fitted outside the tie rod), resulting in a large number of parts, complex assembly processes, and the unoptimized placement of the cartridge valve, which affects the hydraulic circuit response speed and system reliability.

[0004] Therefore, there is an urgent need for a horizontal two-plate direct-pressure rubber injection molding machine with a further simplified structure, lower cost, and higher stability. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A horizontal two-plate direct-pressure rubber injection molding machine includes a frame, a fixed platen, a moving platen, guide pillars, a quick-locking cylinder, a high-pressure locking cylinder, and a cartridge valve. The fixed platen is fixed on the frame, and the moving platen is slidably mounted on the frame and positioned opposite to the fixed platen. There are at least two guide pillars, one end of which passes through guide pillar holes in both the fixed and moving platens. The quick-locking cylinder is positioned between the moving and fixed platens to drive the moving platen to move relative to the fixed platen. The high-pressure locking cylinder is mounted on the moving platen, and its cylinder body is fixedly connected to or integrally formed with the moving platen. The extension end of the guide pillar extends into the high-pressure locking cylinder, and the piston of the high-pressure locking cylinder is fixedly connected to the extension end of the guide pillar. The piston divides the interior of the high-pressure locking cylinder into a front chamber and a rear chamber. The cartridge valve is located in the tail cover of the high-pressure locking cylinder to control the opening and closing of the front and rear chambers. In the above technical solution, the frame serves as the load-bearing foundation of the entire equipment. The fixed template is fixed on the frame to provide an installation reference for one side of the mold, while the movable template is slidably mounted on the frame to drive the other side of the mold to open and close. The guide post passes through the guide post holes of the fixed template and the movable template, providing guidance for the movement of the movable template and bearing the clamping force. The quick clamping cylinder is connected between the movable template and the fixed template, providing driving force for the opening and closing movement of the movable template. The cylinder body of the high-pressure clamping cylinder is fixedly connected to or integrally formed with the movable template, making the high-pressure clamping cylinder a component of the movable template, reducing the number of parts and assembly steps compared to a split assembly structure. The guide post extends into the high-pressure clamping cylinder, and the piston is fixedly connected to the guide post, allowing the guide post to be used directly as the piston rod of the high-pressure clamping cylinder, eliminating the need for a traditional brake mechanism. The cartridge valve is located in the tail cover of the high-pressure clamping cylinder, shortening the oil circuit length between the front and rear chambers, reducing oil circuit resistance, and improving the oil circuit response speed.

[0006] Furthermore, the cartridge valve has an open state and a one-way communication state. During mold opening, the cartridge valve opens to connect the front cavity and the rear cavity, and the quick-locking cylinder drives the moving mold plate away from the fixed mold plate. During mold locking, the quick-locking cylinder drives the moving mold plate closer to the fixed mold plate to a set position, oil enters the front cavity of the high-pressure mold locking cylinder, and the cartridge valve switches to the one-way communication state, allowing the oil in the rear cavity to flow unidirectionally to the front cavity, thus achieving high-pressure mold locking. The two states of the cartridge valve enable smooth switching between the two working modes of mold opening and mold locking: during mold opening, the cartridge valve opens to connect the front cavity and the rear cavity, and the oil in the front and rear cavities flows freely without generating throttling resistance as the piston of the high-pressure mold locking cylinder moves with the guide post, ensuring smooth and rapid mold opening; during mold locking, the cartridge valve switches to the one-way communication state, and after oil enters the front cavity, the oil in the rear cavity can flow unidirectionally to the front cavity but is not allowed to flow back, thereby forming and maintaining a high-pressure mold locking force in the high-pressure mold locking cylinder, achieving reliable mold locking without a brake mechanism.

[0007] Furthermore, the cylinder body of the high-pressure mold-locking cylinder is integrally formed with the moving template. The integral formation of the cylinder body and the moving template means that the cylinder body, as part of the moving template body, is formed from the same blank through casting or machining into an inseparable integral structure. Compared to a separate assembly structure, integral forming eliminates the assembly gaps and connecting parts between the cylinder body and the moving template, improving the overall structural rigidity and sealing reliability. It also further reduces the number of parts and assembly steps, lowering manufacturing costs.

[0008] Furthermore, the pilot valve of the cartridge valve is an electromagnetic directional valve. By using an electromagnetic directional valve as the pilot valve of the cartridge valve, the switching of the pilot valve can be controlled by an electrical signal, thereby controlling the opening and closing of the main valve core of the cartridge valve and its unidirectional flow direction. This achieves rapid electrified switching of the cartridge valve's state, facilitates integration with the electrical system of the injection molding machine, and provides simple and reliable control logic.

[0009] Furthermore, two quick-closing cylinders are provided, one located at the lower end of the non-operating side of the moving mold plate, and the other at the upper end of the operating side of the moving mold plate. The two quick-closing cylinders are arranged diagonally (one at the lower end of the non-operating side, and the other at the upper end of the operating side), so that the driving force application points of the two quick-closing cylinders are diagonally symmetrical about the center of the moving mold plate. When the two quick-closing cylinders operate synchronously, the torque formed by their driving force on the moving mold plate is balanced, thereby effectively avoiding the occurrence of uneven load and tilting of the moving mold plate during the mold opening and closing process, ensuring smooth movement of the moving mold plate and high mold closing accuracy.

[0010] Furthermore, four guide pillars are provided, and four high-pressure clamping cylinders are correspondingly provided. The four guide pillars are respectively located at the four corners of the fixed mold plate and the moving mold plate, providing uniform guiding support for the movement of the moving mold plate and ensuring that the moving mold plate maintains parallelism during the mold opening and closing process; each guide pillar corresponds to one high-pressure clamping cylinder, and the four high-pressure clamping cylinders simultaneously generate clamping force, which is evenly distributed at the four corners of the moving mold plate, ensuring balanced force on the mold and improving the molding quality of the product.

[0011] Furthermore, the quick-locking cylinder includes a cylinder sleeve, a piston, a piston rod, and a fixed flange. The piston rod is connected to the fixed template. The cylinder sleeve is fixed to the moving template, and the piston is housed within the cylinder sleeve. One end of the piston rod is connected to the piston, and the other end is connected to the fixed template via the fixed flange. When pressurized oil enters the rodless or rod-type chamber of the quick-locking cylinder, the piston drives the moving template to move relative to the fixed template, thus achieving mold opening or closing. The structure is simple and compact, directly transmitting hydraulic driving force to the moving template with high transmission efficiency.

[0012] Furthermore, the frame is equipped with a steel strip slide rail, and the bottom of the moving template is fixed with a sliding foot, which slides in contact with the steel strip slide rail. The moving template slides in contact with the steel strip slide rail on the frame through the sliding foot at the bottom. The steel strip slide rail has a smooth surface and good wear resistance, providing a low-friction coefficient sliding support for the movement of the moving template. This ensures that the moving template can slide smoothly under the drive of the quick-locking cylinder. At the same time, the steel strip slide rail bears the weight of the moving template and the mold, reducing the stress on the guide pillars.

[0013] Furthermore, the high-pressure mold-locking cylinder also includes a high-pressure mold-locking cylinder extension rod. One end of the high-pressure mold-locking cylinder extension rod extends out of the cylinder body through the tail cover via a sliding seal, and the other end is located in the rear cavity and connected to the piston. The high-pressure mold-locking cylinder extension rod is provided with an oil hole and an oil passage inside. One end of the oil passage is connected to an external oil passage, and the other end is connected to the oil passage. The oil passage radially penetrates and connects to the rear cavity. The extension rod of the high-pressure clamping cylinder serves the dual functions of a piston rod and an oil passage: its extension end extends out of the cylinder body through the tail cover, facilitating the detection of piston position with external detection elements (such as proximity switches, electronic rulers, etc.); its end located in the rear cavity is connected to the piston; the oil holes and oil passages inside the extension rod form the channel between the rear cavity and the external oil passage—external pressure oil enters through the oil holes and enters the rear cavity through the radial outlet of the oil holes, while the return oil from the rear cavity is discharged along the opposite path. This oil passage arrangement integrates the oil passage inside the extension rod, eliminating the need for additional complex oil passages on the cylinder body or moving platen, simplifying the processing technology, reducing sealing links, and lowering the risk of leakage.

[0014] Furthermore, the high-pressure mold-locking cylinder also includes a high-pressure mold-locking cylinder copper sleeve and a high-pressure mold-locking cylinder front cover. The high-pressure mold-locking cylinder copper sleeve is provided with a sealing ring and makes sealing sliding contact with the guide post. The high-pressure mold-locking cylinder front cover is connected to the end face of the high-pressure mold-locking cylinder copper sleeve. The high-pressure mold-locking cylinder copper sleeve is located at the front end of the high-pressure mold-locking cylinder (the end closest to the fixed mold plate). Its inner wall makes sealing sliding contact with the guide post through the sealing ring, ensuring that the pressure oil in the front cavity will not leak out of the cylinder body along the outer wall of the guide post. The high-pressure mold-locking cylinder front cover is connected to the end face of the copper sleeve, fixing the copper sleeve in the cylinder body. At the same time, a dust seal is provided inside the front cover to prevent external dust from entering the cylinder body and contaminating the oil, ensuring the sealing reliability and service life of the high-pressure mold-locking cylinder during long-term reciprocating motion.

[0015] Furthermore, it also includes an injection molding and plasticizing device, which comprises a barrel, a connecting and fixing plate, an injection cylinder, a plasticizing mechanism, an oil hole connecting plate, and a linear guide rail. The barrel is fixed within the fixed template, and the connecting and fixing plate connects and fixes the injection cylinder and the plasticizing mechanism. The linear guide rail is disposed between the frame and the connecting and fixing plate. The injection molding and plasticizing device is used to plasticize and inject rubber materials. The barrel is fixed within the fixed template, and the nozzle of the barrel is aligned with the mold inlet on the fixed template. The connecting and fixing plate connects the injection cylinder and the plasticizing mechanism into a single unit. The linear guide rail is disposed between the frame and the connecting and fixing plate, allowing the entire injection molding and plasticizing device to slide along the linear guide rail, facilitating injection movement and maintenance.

[0016] Furthermore, two injection cylinders are provided, and the oil hole connecting plate connects the oil holes of the two injection cylinders. Each injection cylinder is equipped with a double-ended piston rod. The two injection cylinders are arranged side by side, and their oil holes are interconnected through the oil hole connecting plate to ensure that the two injection cylinders operate synchronously. The injection cylinder is equipped with a double-ended piston rod, one end of which is used to connect to the connecting fixing plate, and the other end is used to connect to the plasticizing mechanism, so that the injection cylinder can simultaneously drive the plasticizing mechanism and the connecting fixing plate, resulting in a compact structure.

[0017] Furthermore, it also includes an electrical system, a hydraulic system, a heating oil device, and a safety door. The electrical system is used for the electrical control and signal processing of the entire machine, the hydraulic system provides a pressurized oil source for each cylinder, the heating oil device is used to control the oil temperature of the hydraulic system, and the safety door is located on the outside of the equipment for safety protection. All of the above systems work together to form a complete horizontal two-platen direct-pressure rubber injection molding machine.

[0018] Compared with the prior art, the present invention has the following technical advantages: 1. This horizontal two-platen direct-pressure rubber injection molding machine eliminates the need for components such as the brake mechanism and tail plate of traditional two-platen machines by fixing or integrally molding the cylinder body of the high-pressure locking cylinder with the moving platen (especially the preferred integral molding scheme). At the same time, compared with the existing split cylinder assembly structure (such as the method of the cylinder body being sleeved outside the tie rod), it reduces the number of parts and assembly steps, simplifies the overall structure of the machine, and reduces manufacturing costs.

[0019] 2. This horizontal two-platen direct-pressure rubber injection molding machine shortens the oil circuit length between the front and rear chambers and reduces oil circuit resistance by installing a cartridge valve in the tail cover of the high-pressure locking cylinder. The cartridge valve is used to control the on / off state between the front and rear chambers and, together with the electromagnetic directional valve, achieves rapid electrical control. The oil circuit control is simple, reliable, and has a fast response speed.

[0020] 3. The quick-locking cylinders of this horizontal two-platen direct-pressure rubber injection machine are arranged diagonally, which makes the moving platen evenly stressed during the opening and closing process, avoids uneven loading, ensures smooth opening and closing movement, and has high mold closing accuracy.

[0021] 4. The high-pressure locking cylinder extension rod of this horizontal two-platen direct-pressure rubber injection machine has the dual functions of piston rod and oil passage. The oil passage is integrated inside the extension rod, eliminating the need to open complex oil passages on the cylinder body or moving platen, simplifying the processing technology, reducing sealing links, and lowering the risk of leakage. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the horizontal two-platen direct-pressure rubber injection molding machine of the present invention; Figure 2 This is a schematic diagram of the front structure of the mold-locking mechanism of the present invention; Figure 3 yes Figure 2 A schematic diagram of the right-side view; Figure 4 yes Figure 3 A schematic diagram of the AA cross-sectional structure; Figure 5 yes Figure 3 A schematic diagram of the BB cross-sectional structure; Figure 6 yes Figure 3 Schematic diagram of CC cross-section structure; Figure 7 This is a schematic diagram of the frame and injection plasticizing device of the present invention; Figure 8 yes Figure 7 A schematic diagram of the right-side view structure; Figure 9 This is a schematic diagram of the hydraulic principle of the high-pressure mold-locking cylinder of the present invention; Figure 10 This is a cross-sectional view of the cartridge valve of the present invention. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0024] like Figures 1 to 10 As shown, the present invention provides a horizontal two-plate direct-pressure rubber injection molding machine, including a frame 1, a mold clamping mechanism 2, an injection device 3, an electrical system 4, a hydraulic system 5, a heated oil device 6, and a protective door 7.

[0025] The frame 1 is located below the equipment and is the load-bearing part of the equipment. It includes the frame 1.1, the fixed plate positioning plate 1.2, the steel strip slide rail 1.3, the linear guide rail fixing plate 1.4, and the oil tank 1.5.

[0026] The mold-locking mechanism 2 includes a fixed mold plate 2.1, a moving mold plate 2.2, a sliding foot 2.3, a quick-locking cylinder 2.4, a guide post 2.5, a guide post nut 2.6, a pressure cap 2.7, and a high-pressure mold-locking cylinder 2.8.

[0027] The fixed template 2.1 is fixed to the positioning plate 1.1 of the frame 1. The bottom surface of the movable template 2.2 is fixed to the upper end surface of the sliding foot 2.3, and the bottom of the sliding foot 2.3 slides in contact with the steel strip slide rail 1.2 of the frame 1.

[0028] There are four guide pillars 2.5 in total, each with threads at both ends and a sealing ring groove at one end. One end of the guide pillar 2.5 passes through the four guide pillar holes on the upper and lower sides of the fixed template 2.1 and the moving template 2.2. The guide pillar nut 2.6 is threaded to one end of the guide pillar 2.5, and the end face of the guide pillar nut 2.6 contacts the end face of the guide pillar hole in the fixed template 2.1. The pressure cap 2.7 contacts the end face of the guide pillar 2.5 and is fixed to the fixed template 2.1 with screws.

[0029] like Figure 2 and Figure 4 As shown, the high-pressure mold-locking cylinder 2.8 mainly includes a high-pressure mold-locking cylinder sleeve 2.8-1, a high-pressure mold-locking cylinder piston 2.8-2, a high-pressure mold-locking cylinder extension rod 2.8-3, a high-pressure mold-locking cylinder copper sleeve 2.8-4, a high-pressure mold-locking cylinder front cover 2.8-5, a high-pressure mold-locking cylinder tail cover 2.8-6, a cartridge valve 2.8-7, and a guide post 2.5.

[0030] The high-pressure mold-locking cylinder sleeve 2.8-1 is integrated with the moving template 2.2 as a single unit (i.e., the sleeve is part of the moving template body, formed from the same blank through casting or machining into a non-removable integral structure). One end of the guide post 2.5 extends into the high-pressure mold-locking cylinder sleeve 2.8-1 within the moving template 2.2. A high-pressure mold-locking cylinder piston 2.8-2 with sliding sealing contact is provided within the high-pressure mold-locking cylinder sleeve 2.8-1. The high-pressure mold-locking cylinder piston 2.8-2 is threadedly connected to the end of the guide post 2.5, and a sealing ring is provided inside the contact area between the guide post 2.5 and the high-pressure mold-locking cylinder piston 2.8-2. The high-pressure mold-locking cylinder piston 2.8-2 divides the high-pressure mold-locking cylinder 2.8 into two chambers: a front chamber 2.8a and a rear chamber 2.8b.

[0031] like Figure 10As shown, the cartridge valve 2.8-7 mainly includes components such as a valve core, valve body, sealing gasket, spring, valve cover, adjusting plate, adjusting rod, and push rod. The cartridge valve 2.8-7 is installed inside the tail cover 2.8-6 of the high-pressure clamping cylinder. Port A of the cartridge valve is connected to the rear chamber 2.8b, and port B is connected to the front chamber 2.8a through process hole 2.8-8. The pilot valve of cartridge valve 2.8-7 is a solenoid directional valve, which can control the opening and closing of the cartridge valve. Cartridge valve 2.8-7 is also equipped with an adjusting rod, which can be used in conjunction with a motor to adjust the opening of the valve core, thereby regulating the flow rate. By directly integrating the cartridge valve inside the tail cover, the oil path from the rear chamber to the front chamber is extremely short, reducing the oil path resistance and improving the clamping force establishment speed and system response characteristics.

[0032] One end of the high-pressure mold-locking cylinder extension rod 2.8-3 extends out of the high-pressure mold-locking cylinder sleeve 2.8-1 through the sliding seal contact of the high-pressure mold-locking cylinder tail cover 2.8-6, while the other end is located inside the rear cavity 2.8b. The end face of this end is provided with a sealing ring and is connected to the high-pressure mold-locking cylinder piston 2.8-2.

[0033] The extension rod 2.8-3 of the high-pressure mold-locking cylinder has two internal oil holes, 2.8-3-a and 2.8-3-b. The protruding end of oil hole 2.8-3-a is connected to the external oil circuit, and the other end is connected to oil hole 2.8-3-b. Oil hole 2.8-3-b penetrates radially and connects to the rear cavity 2.8b.

[0034] The high-pressure mold-locking cylinder copper sleeve 2.8-4 is equipped with a sealing ring that makes sealed sliding contact with the guide post 2.5. The high-pressure mold-locking cylinder front cover 2.8-5 is connected to the end face of the high-pressure mold-locking cylinder copper sleeve 2.8-4. A dust seal is installed inside the high-pressure mold-locking cylinder front cover 2.8-5.

[0035] like Figure 3 As shown, the quick-locking cylinder 2.4 mainly includes a cylinder sleeve 2.4-1, a piston 2.4-2, a piston rod 2.4-3, and a fixed flange 2.4-4. One quick-locking cylinder 2.4 is located at the lower end of the non-operating side of the moving template 2.2, and the other quick-locking cylinder 2.4 is located at the upper end of the operating side of the moving template 2.2. The corresponding piston rod 2.4-3 is connected to the fixed template 2.1. The quick-locking cylinders are arranged diagonally to ensure that the moving template is subjected to uniform force during mold opening and closing, avoiding motion jamming and mold wear caused by uneven load.

[0036] The injection molding plasticizing device 3 includes a barrel 3.1, a connecting and fixing plate 3.2, an injection cylinder 3.3, a plasticizing mechanism 3.4, an oil hole connecting plate 3.5, a linear guide rail 3.6, and a fixing flange 3.7. The barrel 3.1 is fixed within the fixed template 2.1. The connecting and fixing plate 3.2 connects and fixes the double injection cylinders 3.3 and the plasticizing mechanism 3.4. The oil hole connecting plate 3.5 connects the oil holes of the two injection cylinders 3.3. The injection cylinder 3.3 is equipped with a double-ended piston rod 3.3-1. The linear guide rail 3.6 is positioned between the linear guide rail fixing plate 1.4 and the connecting and fixing plate 3.2. The fixing flange 3.7 is threadedly connected to the injection cylinder piston rod 3.3-1, connecting the injection molding plasticizing device 3 to the fixed template 2.1.

[0037] The following is combined with Figure 9 The hydraulic schematic diagram shown describes the working process of the present invention in detail.

[0038] Rapid mold clamping (closing) operation process: The oil inlet directional valve 8 of the high-pressure mold clamping cylinder is not energized, the pilot solenoid directional valve of cartridge valve 2.8-7 is not energized, and the pilot solenoid valve of hydraulic check valve 9 is not energized. When the rapid mold clamping cylinder 2.4 performs the rapid mold closing action, the moving platen 2.2 is subjected to a force in the direction of the fixed platen 2.1, and the moving platen 2.2 moves closer to the fixed platen 2.1. At this time, the guide post 2.5 extends outward from the cylinder sleeve relative to the moving platen 2.2, and the piston 2.8-2 of the high-pressure mold clamping cylinder moves in the direction of the rear cavity 2.8b relative to the cylinder sleeve. The hydraulic oil in the rear cavity 2.8b rises due to compression. At this time, the valve core cavity of cartridge valve 2.8-7 is connected to the oil tank (the pilot solenoid directional valve is not energized, and the valve core cavity is connected to the oil tank). The hydraulic oil in the rear cavity 2.8b overcomes the spring force of cartridge valve 2.8-7 and flows from the rear cavity 2.8b through cartridge valve 2.8-7 to the front cavity 2.8a (i.e., cartridge valve 2.8-7 is in the open state). Because the effective cross-sectional areas of the front cavity 2.8a and the rear cavity 2.8b are equal, the oil volume is equal, and the oil inside the high-pressure mold-closing cylinder circulates between the front and rear cavities without the need to replenish oil from the oil tank, thus achieving "internal circulation" of the oil. Due to the large cylinder diameter of the high-pressure mold-closing cylinder, this internal circulation method enables rapid mold closing action even with a small main oil pump displacement.

[0039] High-pressure mold clamping operation process: When the rapid mold clamping position reaches the set value, the rapid mold closing cylinder stops supplying oil. The oil inlet directional valve 8 of the high-pressure mold clamping cylinder is energized, the pilot solenoid directional valve of cartridge valve 2.8-7 is energized, and the pilot solenoid valve of hydraulic check valve 9 is energized. High-pressure oil enters the front chamber 2.8a through the oil inlet directional valve 8. At this time, because the pilot solenoid directional valve of cartridge valve 2.8-7 is energized, oil enters the valve core cavity of cartridge valve 2.8-7. Under the action of pressure oil, the valve core makes tight contact with the sealing gasket, and cartridge valve 2.8-7 is closed (ports A and B are not connected, that is, the rear chamber 2.8b and the front chamber 2.8a are cut off). At the same time, hydraulic check valve 9 is opened due to the energization of the pilot solenoid valve, and the oil in the rear chamber 2.8b flows back to the oil tank through hydraulic check valve 9. After oil enters the front chamber 2.8a, high pressure is established, pushing piston 2.8-2 towards the rear chamber 2.8b. However, since guide post 2.5 is fixed to fixed template 2.1, and piston 2.8-2 is fixedly connected to guide post 2.5, the reaction force presses moving template 2.2 towards fixed template 2.1, thus achieving high-pressure mold locking. The mold locking action ends after the proximity switch feedbacks that the mold is locked in place.

[0040] Mold opening process: The oil inlet directional valve 8 of the high-pressure mold-locking cylinder is de-energized, the pilot solenoid directional valve of cartridge valve 2.8-7 is de-energized, and the pilot solenoid directional valve of hydraulic check valve 9 is also de-energized. The quick-locking cylinder 2.4 begins the mold opening action. The quick-locking cylinder 2.4 drives the moving platen 2.2 to be subjected to a force away from the fixed platen 2.1, causing the moving platen 2.2 to move away from the fixed platen 2.1. At this time, the guide post 2.5 retracts into the cylinder sleeve relative to the moving platen 2.2, and the oil in the front chamber 2.8a is squeezed, increasing the oil pressure. This overcomes the valve core spring force of cartridge valve 2.8-7, causing cartridge valve 2.8-7 to open. The oil in the front chamber 2.8a flows to the rear chamber 2.8b through cartridge valve 2.8-7 (i.e., cartridge valve 2.8-7 is in the open state, opposite to the flow direction during quick mold locking). At this time, the mold opening action continues rapidly, and there is no need for the oil pump to provide a large amount of oil, achieving internal circulation of the oil. When the moving template reaches the preset position, the electronic ruler sends a feedback signal, and the system stops opening the mold.

[0041] The plasticizing injection process can employ conventional rubber injection plasticizing methods in this field, which will not be elaborated further.

[0042] In summary, as described in the specification and figures, this invention has been manufactured into actual samples and tested multiple times. The test results demonstrate that the invention achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of the invention. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this invention without departing from the scope of the technical features and similar features of this invention, based on partial modifications or alterations, are within the protection scope of this invention.

Claims

1. A horizontal two-platen direct-pressure rubber injection molding machine, characterized in that, include: Rack (1); The template (2.1) is fixed on the frame (1); The movable template (2.2) is slidably mounted on the frame (1) and is positioned opposite to the fixed template (2.1); Guide pillars (2.5), at least two, one end of which passes through the guide pillar hole of the fixed template (2.1) and the moving template (2.2); A quick-closing cylinder (2.4) is disposed between the moving template (2.2) and the fixed template (2.1) for driving the moving template (2.2) to move relative to the fixed template (2.1); A high-pressure mold-locking cylinder (2.8) is mounted on the moving template (2.2). The cylinder body of the high-pressure mold-locking cylinder (2.8) is fixedly connected to the moving template (2.2) or integrally formed. The extension end of the guide post (2.5) extends into the high-pressure mold-locking cylinder (2.8). The piston (2.8-2) of the high-pressure mold-locking cylinder (2.8) is fixedly connected to the extension end of the guide post (2.5). The piston (2.8-2) divides the interior of the high-pressure mold-locking cylinder (2.8) into a front chamber (2.8a) and a rear chamber (2.8b). A cartridge valve (2.8-7) is installed in the tail cap (2.8-6) of the high-pressure mold-locking cylinder (2.8). The cartridge valve (2.8-7) is used to control the opening and closing of the front chamber (2.8a) and the rear chamber (2.8b).

2. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, The cartridge valve (2.8-7) has an open state and a one-way communication state; When the mold is opened, the cartridge valve (2.8-7) opens to connect the front cavity (2.8a) and the rear cavity (2.8b), and the quick-locking cylinder (2.4) drives the moving platen (2.2) away from the fixed platen (2.1). During mold locking, the quick mold locking cylinder (2.4) drives the moving mold plate (2.2) to approach the fixed mold plate (2.1) to a set position. Oil enters the front chamber (2.8a) of the high-pressure mold locking cylinder (2.8), and the cartridge valve (2.8-7) switches to a one-way communication state so that the oil in the rear chamber (2.8b) flows unidirectionally to the front chamber (2.8a), thereby realizing high-pressure mold locking.

3. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, The cylinder body of the high-pressure locking cylinder (2.8) is integrally formed with the moving template (2.2).

4. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, The pilot valve of the cartridge valve (2.8-7) is an electromagnetic directional valve.

5. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, Two quick-locking cylinders (2.4) are provided, one of which is located at the lower end of the non-operating side of the moving template (2.2), and the other is located at the upper end of the operating side of the moving template (2.2).

6. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, Four guide pillars (2.5) are provided, and four high-pressure mold-locking cylinders (2.8) are provided accordingly.

7. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, The quick-locking cylinder (2.4) includes a quick-locking cylinder sleeve (2.4-1), a quick-locking cylinder piston (2.4-2), a quick-locking cylinder piston rod (2.4-3), and a fixed flange (2.4-4). The quick-locking cylinder piston rod (2.4-3) is connected to the fixed template (2.1).

8. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, The frame (1) is provided with a steel strip slide rail (1.3), and the bottom of the moving template (2.2) is fixed with a sliding foot (2.3), which slides in contact with the steel strip slide rail (1.3).

9. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, The high-pressure mold-locking cylinder (2.8) also includes a high-pressure mold-locking cylinder extension rod (2.8-3). One end of the high-pressure mold-locking cylinder extension rod (2.8-3) extends out of the cylinder body through the tail cap (2.8-6) via a sliding seal, and the other end is located in the rear cavity (2.8b) and connected to the piston (2.8-2). The high-pressure mold-locking cylinder extension rod (2.8-3) is provided with an oil hole (2.8-3-a) and an oil hole (2.8-3-b). One end of the oil hole (2.8-3-a) is connected to an external oil passage, and the other end communicates with the oil hole (2.8-3-b). The oil hole (2.8-3-b) radially penetrates and communicates with the rear cavity (2.8b).

10. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, The high-pressure mold-locking cylinder (2.8) also includes a high-pressure mold-locking cylinder copper sleeve (2.8-4) and a high-pressure mold-locking cylinder front cover (2.8-5). The high-pressure mold-locking cylinder copper sleeve (2.8-4) is provided with a sealing ring and makes a sealing sliding contact with the guide post (2.5). The high-pressure mold-locking cylinder front cover (2.8-5) is connected to the end face of the high-pressure mold-locking cylinder copper sleeve (2.8-4).

11. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, It also includes an injection plasticizing device (3), which includes a barrel (3.1), a connecting and fixing plate (3.2), an injection cylinder (3.3), a plasticizing mechanism (3.4), an oil hole connecting plate (3.5), and a linear guide rail (3.6). The barrel (3.1) is fixed inside the fixed template (2.1). The connecting and fixing plate (3.2) connects and fixes the injection cylinder (3.3) and the plasticizing mechanism (3.4). The linear guide rail (3.6) is arranged between the frame (1) and the connecting and fixing plate (3.2).

12. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 11, characterized in that, Two injection cylinders (3.3) are provided. The oil hole connecting plate (3.5) connects the oil holes of the two injection cylinders (3.3). The injection cylinder (3.3) is provided with a double-ended injection cylinder piston rod (3.3-1).

13. The horizontal two-platen direct-pressure rubber injection molding machine according to claim 1, characterized in that, It also includes an electrical system (4), a hydraulic system (5), a heated oil device (6), and a protective door (7).

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