A holding structure and injection molding machine

Abstract

The utility model belongs to injection molding equipment technical field provides a kind of pressure-maintaining structure and injection molding machine, pressure-maintaining structure includes: the body is arranged between nozzle and cylinder, flow passage is provided in body, and first passageway and second passageway are communicated with flow passage;Shut-off member is arranged on the body, including the gate valve core movably inserted in first passageway;Pressure-maintaining member is arranged on the body, including valve core driving part and pressure-maintaining valve core, valve core driving part is obliquely arranged on the body, pressure-maintaining valve core is movably inserted in second passageway, the output end of valve core driving part and pressure-maintaining valve core contact abutment.Compared with prior art, the utility model has by adding independent pressure-maintaining structure between the cylinder and nozzle of injection molding machine, realizes the decoupling of pressure-maintaining function and main injection system, avoids the mode of long time keeping pressure in traditional process depending on screw, significantly shortens injection molding cycle, improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding equipment technology, specifically relating to a pressure holding structure and an injection molding machine. Background Technology

[0002] Injection molding machines are key molding equipment used to transform thermoplastic or thermosetting plastics into various plastic products. A typical workflow is as follows: First, granular or powdered plastic raw materials enter a melt cylinder heated to the appropriate temperature from the hopper, where the plastic is heated and melted into a fluid state. Then, driven by a screw, it is injected into a cooling mold through a nozzle located at the front of the melt cylinder. The plastic cools and solidifies in the mold to form the final plastic product.

[0003] To ensure the quality of injection-molded parts, a certain pressure needs to be maintained after the injection process to complete a holding pressure process. This stage plays an important role in eliminating internal stress and reducing shrinkage. Only after the holding pressure process is completed can the next cycle preparation stage begin, which involves another melting operation in preparation for the next injection.

[0004] Although some injection molding machines have been equipped with basic pressure holding functions with the development of technology, the injection molding machines on the market still face the following major challenges: (1) Low production efficiency: Due to the long injection cycle time, the overall production efficiency is not high. (2) High energy consumption and poor pressure holding effect: Relying on hydraulic motors to achieve the pressure holding function not only consumes a lot of energy, but also affects the pressure holding effect due to the long transmission distance, which can easily cause problems such as bubbles in the product and increase the scrap rate. (3) Environmental pollution and health risks: Defects in the design of the melt cylinder (such as straight-through injection hole) may cause overflow, generate pollutants, and release harmful gases, posing a threat to the environment and human health. Traditional solutions (such as installing a vacuum device) can partially alleviate the problem, but they increase additional costs. (4) Lack of effective pressurization mechanism: Existing equipment often does not have effective pressurization capabilities, which limits the possibility of further improving product quality.

[0005] Considering all the above factors, existing solutions are unable to simultaneously meet the requirements of high efficiency, environmental protection, and energy saving, resulting in high overall operating costs. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a pressure holding structure and an injection molding machine in light of the current state of the technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: a pressure-holding structure is proposed, connected to an injection molding machine, for performing a pressure-holding operation after the injection molding machine has finished feeding material. The injection molding machine includes a nozzle and a barrel, and the pressure-holding structure includes:

[0008] The body is disposed between the nozzle and the barrel. The body is provided with a flow channel, as well as a first channel and a second channel that are both connected to the flow channel. The flow channel is used to connect the nozzle and the barrel. The second channel is arranged at an inclination relative to the flow channel.

[0009] A flow-stopping element, disposed on the body, includes a gate valve core movably inserted into the first channel, the gate valve core having a first position and a second position;

[0010] A pressure-holding component, disposed on the main body, includes a valve core drive component and a pressure-holding valve core. The valve core drive component is inclinedly disposed on the main body, and the pressure-holding valve core is movably inserted into the second channel. The output end of the valve core drive component contacts and abuts against the pressure-holding valve core.

[0011] When the gate valve core is in the first position, it connects the barrel and the nozzle. The injection molding material flowing in the flow channel pushes the pressure holding valve core out of the flow channel, allowing the injection molding material to flow into the nozzle.

[0012] When the gate valve core is in the second position, it blocks the communication between the barrel and the nozzle. The valve core drive pushes one end of the pressure-holding valve core into the flow channel to apply pressure to the raw material in the nozzle for pressure holding operation.

[0013] In one of the pressure-holding structures described above, a first mounting seat is provided on the main body, the valve core drive is disposed on the first mounting seat, and a first heat insulation sheet is provided between the first mounting seat and the main body to prevent heat from the main body from being transferred to the valve core drive.

[0014] In one of the pressure-holding structures described above, a pressure-holding push block is provided at the output end of the valve core drive component. The pressure-holding push block movably abuts against the pressure-holding valve core to prevent the heat of the pressure-holding valve core from being transferred to the valve core drive component.

[0015] In one of the pressure-holding structures described above, a pressure-holding switch sensing plate is provided on the outer side of the valve core drive component, and a connector extending to the outer side of the first mounting base is provided on the pressure-holding push block. A connecting rod is provided on the connector, and the connecting rod extends at least partially to the pressure-holding switch sensing plate to detect the movement distance of the pressure-holding valve core.

[0016] In one of the pressure-holding structures described above, the gate valve core is provided with a through hole;

[0017] When the gate valve core is in the first position, the through hole and the flow channel are aligned, so that the barrel and the nozzle are connected.

[0018] When the gate valve core is in the second position, the through hole and the flow channel are misaligned, blocking the connection between the barrel and the nozzle.

[0019] In one of the pressure-holding structures described above, the flow-blocking component includes a second mounting base and a gate valve actuator disposed on the second mounting base. The gate valve core is connected to the output end of the gate valve actuator. The second mounting base is disposed on the body, and a second heat insulation sheet is disposed between the two to prevent the heat of the body from being transferred to the gate valve actuator.

[0020] In one of the pressure-holding structures described above, a gate valve switch sensing plate is provided on the gate valve drive, and a sensing contact extending to the outside of the second mounting base is provided at the output end of the gate valve drive. At least a portion of the sensing contact extends to the gate valve switch sensing plate and is used to detect the distance that the gate valve drive moves the gate valve core.

[0021] In one of the pressure-holding structures described above, the body is provided with an overflow groove and an overflow hole. The overflow groove is connected to the second channel, and one end of the overflow hole is connected to the overflow groove, while the other end penetrates the outer wall of the body, for exporting the injection molding material that seeps out between the pressure-holding valve core and the second channel to the outside of the body.

[0022] The pressure-holding structure described above also includes a flange, which is disposed between the barrel and the body.

[0023] This utility model solves the above-mentioned technical problems and also proposes an injection molding machine, including the aforementioned pressure holding structure.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) By adding an independent pressure-holding structure between the barrel and nozzle of the injection molding machine, the pressure-holding function is decoupled from the main injection system, avoiding the traditional method of relying on the screw to maintain pressure for a long time, significantly shortening the injection cycle and improving production efficiency. At the same time, this structure uses local pressure boosting instead of the traditional hydraulic motor to achieve pressure holding through long-distance transmission, reducing energy loss and improving the pressure holding response speed and control accuracy. In addition, the body is set between the barrel and nozzle to form a closed flow channel. During the non-injection stage, the molten material backflow path can be completely blocked by the gate valve core to prevent the phenomenon of "melting and overflowing at the same time", reducing material waste and environmental pollution. Furthermore, since the second channel is arranged at an angle relative to the flow channel, the valve core drive component (such as a cylinder or hydraulic cylinder) can also be installed at an angle accordingly. This layout design allows the pressure-holding structure to be arranged as close as possible to the nozzle when installed in the injection molding machine, avoiding spatial interference between the valve core drive component and the fixed mold mounting plate of the injection molding machine. This shortens the nozzle length, reduces the residence time and heat loss of the molten material in the nozzle, prevents excessive cooling of the injection molding material, and thus ensures melt flowability and mold filling quality.

[0026] (2) By setting a first mounting seat on the body and adding a first heat insulation sheet (e.g., mica sheet) between the first mounting seat and the high-temperature body, heat from the molten plastic environment can be effectively prevented from being conducted to the valve core drive component.

[0027] (3) A pressure-holding push block is set at the output end of the valve core drive component and keeps it in active contact with the pressure-holding valve core. This not only realizes the effective transmission of driving force, but also uses the push block as a heat conduction isolation element to further prevent high temperature from being conducted from the pressure-holding valve core to the valve core drive component. Attached Figure Description

[0028] Figure 1 This is a perspective view of a portion of the structure of an injection molding machine according to this utility model.

[0029] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0030] Figure 3 This is a plan view of a pressure-holding structure according to this utility model.

[0031] Figure 4 yes Figure 3 Sectional view at point BB.

[0032] Figure 5 yes Figure 4 Sectional view at point CC.

[0033] Figure 6 This is an exploded view of a pressure-holding structure according to this utility model.

[0034] In the diagram, 100 is the nozzle; 200 is the barrel; 300 is the pressure-holding structure; 310 is the body; 311 is the flow channel; 312 is the first channel; 313 is the second channel; 314 is the first mounting base; 315 is the first heat insulation sheet; 316 is the overflow groove; 320 is the flow-stopping component; 321 is the gate valve core; 321a is the through hole; 322 is the second mounting base; 323 is the gate valve drive component; 324 is the second heat insulation sheet; 325 is the gate valve switch sensing plate; 326 is the sensing contact; 330 is the pressure-holding component; 331 is the valve core drive component; 332 is the pressure-holding valve core; 333 is the pressure-holding push block; 334 is the pressure-holding switch sensing plate; 335 is the connecting component; 336 is the connecting rod; 400 is the flange; and 500 is the fixed mold mounting plate. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0037] like Figures 1 to 6 As shown, this utility model provides a pressure-holding structure 300, which is connected to an injection molding machine and is used to perform a pressure-holding operation after the injection molding machine has completed feeding. The injection molding machine includes a nozzle 100 and a barrel 200, and the pressure-holding structure 300 includes: a body 310, a flow-blocking component 320, and a pressure-holding component 330.

[0038] Specifically, the body 310 is disposed between the nozzle 100 and the barrel 200, and has a flow channel 311 inside, as well as two channels that are connected to the flow channel 311—a first channel 312 and a second channel 313. The flow channel 311 is used to connect the nozzle 100 and the barrel 200, and the second channel 313 is arranged at an angle relative to the flow channel 311.

[0039] The flow-stopping element 320 is disposed on the body 310 and includes a gate valve core 321 movably inserted into the first channel 312. The gate valve core 321 has a first position and a second position.

[0040] The pressure-holding component 330 is disposed on the body 310 and includes a valve core drive component 331 and a pressure-holding valve core 332. The valve core drive component 331 is inclinedly disposed on the body 310, and the pressure-holding valve core 332 is movably inserted into the second channel 313, with one end of it contacting and abutting against the output end of the valve core drive component 331.

[0041] During operation, when the gate valve core 321 is in the first position, the barrel 200 and the nozzle 100 are connected through the flow channel 311. The injection molding material flowing in the flow channel 311 pushes the pressure holding valve core 332 out of the flow channel 311, allowing the molten plastic to flow smoothly into the nozzle 100. When the gate valve core 321 switches to the second position, the channel between the barrel 200 and the nozzle 100 is blocked. At this time, the valve core drive 331 pushes one end of the pressure holding valve core 332 into the flow channel 311, applying pressure to the injection molding material stuck at the nozzle 100 end to achieve the pressure holding operation.

[0042] This solution decouples the pressure-holding function from the main injection system by adding an independent pressure-holding structure 300 between the barrel 200 and the nozzle 100 of the injection molding machine. When the gate valve core 321 closes and cuts off the connection between the barrel 200 and the nozzle 100, the independent pressure-holding component 330 locally pressurizes the molten material at the nozzle 100 end, avoiding the traditional method of relying on the screw to maintain pressure for a long time, significantly shortening the injection cycle and improving production efficiency.

[0043] Meanwhile, this structure uses local pressure boosting instead of the traditional hydraulic motor to achieve pressure holding through long-distance transmission, which reduces energy loss, improves pressure holding response speed and control accuracy, effectively reduces the incidence of defects such as bubbles and shrinkage marks in products, and improves product yield.

[0044] Furthermore, the body 310 is positioned between the barrel 200 and the nozzle 100, forming a closed flow channel 311. During non-injection stages, the molten material backflow path can be completely blocked by the gate valve core 321, preventing the phenomenon of "melting and overflowing simultaneously," reducing material waste, and minimizing environmental pollution. This structure also possesses active pressurization capability, overcoming the technical deficiency of existing equipment lacking effective pressurization functions.

[0045] Furthermore, since the second channel 313 is arranged at an angle relative to the flow channel 311, the valve core drive component 331 (such as a cylinder or hydraulic cylinder) can also be installed at a corresponding angle. This layout design allows the pressure holding structure 300 to be arranged as close as possible to the nozzle 100 when installed in the injection molding machine, avoiding spatial interference between the valve core drive component 331 and the fixed mold mounting plate 500 of the injection molding machine. This shortens the length of the nozzle 100, reduces the residence time and heat loss of the molten material in the nozzle 100, prevents excessive cooling of the injection molding material, and thus ensures melt flowability and mold filling quality.

[0046] Furthermore, since the output end of the valve core actuator 331 is in contact with the pressure-holding valve core 332 rather than being fixedly connected, when the gate valve core 321 is in the first position, during the process of the injection molding material flowing from the barrel 200 through the flow channel 311 into the nozzle 100, the pressure-holding valve core 332 will not conduct heat from the second channel 313 to the valve core actuator 331, ensuring the normal operation of the valve core actuator 331. This design not only protects the precision drive components from high temperatures and extends their service life, but also ensures the stability and control accuracy of the drive system, improving the reliability of the overall pressure-holding process.

[0047] A first mounting base 314 is provided on the main body 310, and a valve core drive 331 is provided on the first mounting base 314. A first heat insulation sheet 315 is provided between the first mounting base 314 and the main body 310 to block the heat on the main body 310 from being transferred to the valve core drive 331.

[0048] By providing a first mounting base 314 on the main body 310 and adding a first heat insulation sheet 315 (e.g., mica sheet) between the first mounting base 314 and the high-temperature main body 310, heat from the molten plastic environment can be effectively prevented from being conducted to the valve core drive component 331. This not only protects precision drive components (such as cylinders or servo motors) from high temperatures and extends their service life, but also ensures the stability and control accuracy of the drive system, thereby improving the reliability of the overall pressure holding process, reducing the risk of failure due to thermal deformation, and indirectly reducing maintenance costs and downtime.

[0049] The output end of the valve core drive 331 is provided with a pressure holding push block 333, which is in movable contact with the pressure holding valve core 332 to prevent the heat of the pressure holding valve core 332 from being transferred to the valve core drive 331.

[0050] A pressure-holding pusher 333 is provided at the output end of the valve core drive 331, and it is kept in active contact with the pressure-holding valve core 332. This not only achieves effective transmission of driving force, but also uses the pusher as a heat conduction isolation element to further prevent high temperature from being conducted from the pressure-holding valve core 332 to the valve core drive 331. This design, together with the heat insulation sheet between the first mounting base 314 and the valve core drive 331, forms a "double heat insulation" structure, which significantly enhances the thermal management capability of the system. This allows the valve core drive 331 (such as a cylinder, hydraulic cylinder, or servo motor) to operate stably in a relatively low-temperature environment, thereby improving the reliability and safety of the equipment under long-term operation.

[0051] A pressure-holding switch sensing plate 334 is provided on the outer side of the valve core drive component 331. A connector 335 extending to the outer side of the first mounting base 314 is provided on the pressure-holding push block 333. A connecting rod 336 is provided on the connector 335. The connecting rod 336 extends at least partially to the pressure-holding switch sensing plate 334 and is used to detect the movement distance of the pressure-holding valve core 332.

[0052] By incorporating a connector 335 and a connecting rod 336 on the pressure-holding push block 333, and cooperating with the pressure-holding switch sensing plate 334, real-time monitoring of the travel of the pressure-holding valve core 332 is achieved. This detection mechanism can precisely control the magnitude and duration of the pressure-holding action, ensuring consistency in each pressure-holding action, thereby improving product quality stability and reducing the scrap rate. Furthermore, this feedback system supports automated debugging and fault warning functions, facilitating integration into intelligent injection molding control systems, enhancing the equipment's intelligence level, and reducing the need for manual intervention.

[0053] It is worth mentioning that the gate valve core 321 is provided with a through hole 321a; when the gate valve core 321 is in the first position, the through hole 321a is aligned with the flow channel 311, so that the material barrel 200 and the nozzle 100 are connected; when the gate valve core 321 is in the second position, the through hole 321a is misaligned with the flow channel 311, thereby blocking the connection between the material barrel 200 and the nozzle 100.

[0054] By setting a through hole 321a on the gate valve core 321 and utilizing its alignment or misalignment relative to the flow channel 311 to control the opening and closing of the material channel, this structure achieves a fast and reliable flow-stopping function. This compact and sensitive design can complete the opening and closing switch in a very short time, effectively shortening non-production time, increasing equipment operating cycle time, and thus improving overall production efficiency. More importantly, this through hole 321a flow-stopping structure can achieve a full-section seal in the closed state, completely blocking the backflow of molten plastic from the barrel 200 to the nozzle 100, fundamentally eliminating the phenomenon of "melting and overflowing simultaneously." This not only reduces raw material waste but also lowers the risk of harmful gas emissions from molten material decomposition, improving the workshop environment and ensuring the health and safety of operators. Simultaneously, this design reduces material accumulation and carbonization residue, lowering equipment cleaning frequency and environmental treatment costs, further improving the equipment's economy and ease of maintenance.

[0055] The flow-stopping component 320 includes a second mounting base 322 and a gate valve actuator 323 disposed on the second mounting base 322. The gate valve core 321 is connected to the output end of the gate valve actuator 323. The second mounting base 322 is fixed to the body 310, and a second heat insulation sheet 324 is provided between the two to block the heat of the body 310 from being transferred to the gate valve actuator 323.

[0056] By setting a second mounting base 322 and mounting the gate valve drive 323 on it, and adding a second heat insulation sheet 324 between the second mounting base 322 and the main body 310, heat conduction from the high-temperature main body 310 to the gate valve drive 323 is effectively isolated. This heat insulation design not only prevents heat from being directly conducted through structural components, avoiding performance degradation or thermal deformation of the drive components due to high temperatures, but also ensures the stability and repeatability of the shut-off action, preventing the gate valve core 321 from failing to move due to drive mechanism jamming or slow response. This ensures reliable and accurate shut-off processes each time, significantly improving the system's operational stability and long-term durability. Compared to traditional injection molding machines that rely on overall hydraulic system temperature control or lack effective heat insulation, this structural design is simpler, requires no additional cooling device, consumes less energy, and reduces equipment manufacturing and maintenance costs, making it more practical and economical for engineering applications.

[0057] The gate valve actuator 323 is provided with a gate valve switch sensing plate 325. The output end of the gate valve actuator 323 is provided with a sensing contact 326 extending to the outside of the second mounting base 322. The sensing contact 326 extends at least partially to the gate valve switch sensing plate 325 and is used to detect the distance that the gate valve actuator 323 drives the gate valve core 321 to move.

[0058] By setting a sensing contact 326 at the output end of the gate valve actuator 323 and cooperating with the gate valve switch sensing plate 325, precise detection of the position of the gate valve core 321 is achieved, ensuring accurate switching between the first position (open) and the second position (closed). This monitoring mechanism can promptly detect abnormal actions (such as leakage due to incomplete closure), prevent the generation of defective products, and improve process controllability and product consistency. Simultaneously, the data can be connected to the central control system to achieve remote monitoring and preventative maintenance, reducing the burden of manual inspections and increasing the degree of production automation.

[0059] The body 310 is provided with an overflow groove 316 and an overflow hole. The overflow groove 316 is connected to the second channel 313. One end of the overflow hole is connected to the overflow groove 316, and the other end penetrates the outer wall of the body 310. It is used to guide the injection molding material that seeps out between the pressure holding valve core 332 and the second channel 313 to the outside of the body 310.

[0060] An overflow groove 316, connected to the second channel 313, is provided on the main body 310. One end of the overflow hole is connected to the overflow groove 316, and the other end extends to the outer wall of the main body 310, forming an effective channel for discharging leaked material. This structure can promptly discharge a small amount of molten plastic seeping from the gap between the pressure-holding valve core 332 and the second channel 313 to the outside of the main body 310, preventing the high-temperature molten material from accumulating and carbonizing inside. This prevents blockage of the pressure-holding valve core 332's movement path, reduces frictional resistance, and ensures the smoothness and repeatability of the pressure-holding action. Simultaneously, it effectively reduces the release of harmful gases caused by material retention and decomposition, improving the equipment operating environment and protecting the health of operators. Furthermore, this design extends the maintenance cycle of the pressure-holding structure 300, reduces cleaning difficulty and downtime costs, and improves the long-term reliability and economy of the equipment. This overflow discharge mechanism provides crucial protection for the stable operation of precision components under high temperature and high pressure environments, further enhancing the applicability and practicality of this solution in actual working conditions.

[0061] Similarly, the main body 310 is also provided with an overflow groove that communicates with the first channel 313, and an overflow hole that connects to the overflow groove at one end and penetrates the side wall of the main body 310 at the other end. The functions of the overflow groove and the overflow hole are the same as those of the overflow groove and overflow hole mentioned above, and will not be described again here.

[0062] This solution also includes flange 400, which is located between barrel 200 and body 310.

[0063] By adding a flange 400 and placing it between the barrel 200 and the body 310, a standardized and modular connection between the pressure-holding structure 300 and the injection molding machine body is achieved. This connection method offers excellent sealing performance and structural strength, facilitating quick replacement or upgrading of the pressure-holding unit without altering existing core components of the injection molding machine, thus greatly enhancing the versatility and scalability of this solution. Users can flexibly select whether to add a pressure-holding function as needed, achieving "on-demand configuration," reducing initial investment costs, and promoting the widespread adoption of energy-efficient technologies.

[0064] This solution also proposes an injection molding machine, including the aforementioned pressure holding structure.

[0065] This solution provides a pressure-holding structure 300 and an injection molding machine for use in injection molding, aiming to solve technical problems existing in current injection molding equipment, such as long injection cycles, high energy consumption, poor pressure-holding effect, overflow pollution during the melting process, health hazards from exhaust gas, and lack of effective pressurization function. By setting a modular body 310 structure with independent flow interception and pressure-holding functions between the barrel 200 and the nozzle 100, separate control of the injection and pressure-holding processes is achieved. This structure uses a gate valve core 321 to achieve rapid opening and closing of the flow channel 311, and in conjunction with an inclined pressure-holding valve core 332 and a drive mechanism, precise local pressurization is applied to the front-end molten material after the main channel is closed, significantly improving the pressure-holding response speed and pressure stability, effectively reducing product defects, and increasing yield.

[0066] Meanwhile, this solution enhances the system's thermal protection and operational controllability by incorporating auxiliary structures such as heat insulation sheets, pressure-holding push blocks 333, and sensing detection components. This ensures the long-term stable operation of key drive components in high-temperature environments and enables real-time monitoring of valve core position and stroke, supporting intelligent production management. The modular flange 400 connection design further improves the device's versatility and maintainability, facilitating its application in both new and existing models.

[0067] In summary, this solution not only significantly shortens the injection molding cycle and reduces energy consumption, but also fundamentally curbs material overflow and harmful gas emissions during the melting process, improving the working environment and aligning with the development trends of green manufacturing and energy conservation and emission reduction. The overall solution is compact, cost-controllable, and highly reliable, achieving multiple goals of high efficiency, energy saving, environmental protection, and high-quality production, demonstrating outstanding technological advancement and significant industrial application value.

[0068] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0069] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0070] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A pressure-holding structure connected to an injection molding machine for performing a pressure-holding operation after the injection molding machine has finished feeding material, the injection molding machine comprising a nozzle and a barrel, characterized in that, The pressure-holding structure includes: The body is disposed between the nozzle and the barrel. The body is provided with a flow channel, as well as a first channel and a second channel that are both connected to the flow channel. The flow channel is used to connect the nozzle and the barrel. The second channel is arranged at an inclination relative to the flow channel. A flow-stopping element, disposed on the body, includes a gate valve core movably inserted into the first channel, the gate valve core having a first position and a second position; A pressure-holding component, disposed on the main body, includes a valve core drive component and a pressure-holding valve core. The valve core drive component is inclinedly disposed on the main body, and the pressure-holding valve core is movably inserted into the second channel. The output end of the valve core drive component contacts and abuts against the pressure-holding valve core. When the gate valve core is in the first position, it connects the barrel and the nozzle. The injection molding material flowing in the flow channel pushes the pressure holding valve core out of the flow channel, allowing the injection molding material to flow into the nozzle. When the gate valve core is in the second position, it blocks the communication between the barrel and the nozzle. The valve core drive pushes one end of the pressure-holding valve core into the flow channel to apply pressure to the raw material in the nozzle for pressure holding operation.

2. The pressure-holding structure as described in claim 1, characterized in that, The main body is provided with a first mounting base, the valve core drive is disposed on the first mounting base, and a first heat insulation sheet is disposed between the first mounting base and the main body to prevent heat from the main body from being transferred to the valve core drive.

3. The pressure-holding structure as described in claim 2, characterized in that, The output end of the valve core drive is provided with a pressure-holding push block, which moves against the pressure-holding valve core to prevent the heat of the pressure-holding valve core from being transferred to the valve core drive.

4. The pressure-holding structure as described in claim 3, characterized in that, A pressure-holding switch sensing plate is provided on the outer side of the valve core drive component, and a connector extending to the outer side of the first mounting base is provided on the pressure-holding push block. A connecting rod is provided on the connector, and the connecting rod extends at least partially to the pressure-holding switch sensing plate to detect the movement distance of the pressure-holding valve core.

5. A pressure-holding structure as described in claim 1, characterized in that, The gate valve core is provided with a through hole; When the gate valve core is in the first position, the through hole and the flow channel are aligned, so that the barrel and the nozzle are connected. When the gate valve core is in the second position, the through hole and the flow channel are misaligned, blocking the connection between the barrel and the nozzle.

6. The pressure-holding structure as described in claim 1, characterized in that, The flow-blocking component includes a second mounting base and a gate valve actuator disposed on the second mounting base. The gate valve core is connected to the output end of the gate valve actuator. The second mounting base is disposed on the main body, and a second heat insulation sheet is disposed between the two to prevent the heat of the main body from being transferred to the gate valve actuator.

7. A pressure-holding structure as described in claim 6, characterized in that, The gate valve actuator is provided with a gate valve switch sensing plate, and the output end of the gate valve actuator is provided with a sensing contact extending to the outside of the second mounting base. At least a portion of the sensing contact extends to the gate valve switch sensing plate, and is used to detect the distance that the gate valve actuator drives the gate valve core to move.

8. The pressure-holding structure as described in claim 1, characterized in that, The body is provided with an overflow groove and an overflow hole. The overflow groove is connected to the second channel. One end of the overflow hole is connected to the overflow groove, and the other end penetrates the outer side wall of the body, for exporting the injection molding material that seeps out between the pressure holding valve core and the second channel to the outside of the body.

9. A pressure-holding structure as described in claim 1, characterized in that, It also includes a flange disposed between the barrel and the body.

10. An injection molding machine, characterized in that, Includes a pressure-holding structure as described in any one of claims 1 to 9.

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