A runnerless BMC mold that is easy to unload

Abstract

The present invention relates to the field of mold equipment technology, and specifically to a runner-less BMC mold that is easy to unload, comprising a movable template and a fixed template, a product cavity and a negative pressure cavity being provided between the movable template and the fixed template, an exhaust channel connecting the product cavity and the negative pressure cavity being provided between the movable template and the fixed template, a proximity switch installation position being provided at one end of the exhaust channel adjacent to the product cavity, an injection port being provided at the product cavity of the fixed template, each of the injection ports being connected to a feed channel, an adjustment mechanism being installed at the injection port for adjusting the size of the injection port, and a structure being formed in which the temperature transfer between the feed channel and the fixed template is blocked by the adjustment mechanism when the injection port is closed, and a seamless structure is formed between the injection port and the product cavity, the present invention enables the mold to inject an appropriate amount of material each time, prevents the material in the product cavity from generating bubbles during production through the negative pressure environment, and facilitates the separation of the product from the movable template, thereby facilitating unloading.

Description

Technical Field

[0001] The invention relates to the technical field of mold equipment, in particular to a runner-free BMC mold which is convenient for unloading. Background Art

[0002] BMC (bulk molding compound) is a composite material composed of glass fiber-reinforced polyester resin and other additives, exhibiting excellent mechanical, electrical, and chemical resistance properties. BMC is a thermosetting material that cures by heating within the mold cavity. When filling the mold, the BMC agglomerate is forcibly pressed into the BMC barrel by a BMC feeder. The screw then conveys the material to the front of the barrel before injection into the mold cavity. The injection pressure for BMC is generally between 28 and 35 MPa. When using existing BMC molds, the injection volume must be determined first. Some use theoretical calculation methods, first calculating the volume of the product, and then multiplying it by the material density to obtain the theoretical mass of the product, which is the theoretical value of the injection volume. Some use estimation methods, estimating the injection volume based on experience. Some use trial mold methods, first conducting preliminary trial molds, and adjusting the injection volume based on the trial mold results. After multiple trial molds and adjustments, the appropriate injection volume is determined. Then, based on the determined injection volume value, the corresponding mass of material is injected. This results in too many defective products or too much material waste in the early stage of production, while reducing production efficiency. At the same time, in actual production, factors such as mold wear and batch differences of materials must also be considered to make appropriate fine adjustments to the injection volume, making it difficult for existing molds to inject the appropriate amount of material each time. Summary of the Invention

[0003] In view of the shortcomings of the prior art and to overcome the defects of the prior art, the present invention aims to provide a runner-free BMC mold that is easy to unload, thereby solving the problem that the existing mold is difficult to inject the appropriate amount of material each time.

[0004] The technical solution is a runnerless BMC mold that is easy to unload, including a movable template and a fixed template. A product cavity and a negative pressure cavity are provided between the movable template and the fixed template. An exhaust channel connecting the product cavity and the negative pressure cavity is provided between the movable template and the fixed template. A proximity switch installation position is provided at one end of the exhaust channel adjacent to the product cavity. An injection port is provided at the product cavity of the fixed template. Each injection port is connected to a feed channel. An adjustment mechanism for adjusting the size of the injection port is installed at the injection port of the fixed template, and when the injection port is closed, the temperature transfer between the feed channel and the fixed template is blocked by the adjustment mechanism, and there is a structure without a gap between the injection port and the product cavity.

[0005] Preferably, it also includes a first support plate, a second support plate, and a third support plate, the second support plate is located between the first support plate and the third support plate, the second support plate is fixed relative to the movable template, the second support plate is slidably connected to the push rod in contact with the product cavity, the second support plate is installed with a regulating mechanism for controlling the movement of the push rod relative to the second support plate, and a structure is formed in which the push rod is fixed relative to the second support plate when the pressure in the product cavity changes, and the push rod moves relative to the second support plate when the regulating mechanism is subjected to external force.

[0006] Preferably, a first annular disk is installed at the outer side of the movable template, and a first annular plate is fixedly connected to the first annular disk; a second annular disk is installed at the outer side of the fixed template, and a second annular plate is fixedly connected to the second annular disk; each second annular plate is arranged to slide relative to the first annular plate; a sealing ring is installed at the connection between each second annular plate and the first annular plate; when the movable template is matched with the fixed template, the first annular disk, the second annular disk, the second annular plate, the first annular plate, the movable template and the fixed template cooperate to form an annular tubular structure with a negative pressure chamber inside; a first opening and a second opening are provided on the fixed template to connect the negative pressure chamber with the outside world; a valve is installed on the first opening, and the second opening is connected to the negative pressure equipment.

[0007] Preferably, each of the adjustment mechanisms includes a feed pipe made of a heat-insulating material, one end of the feed pipe is connected to the injection port, the other end of the feed pipe is threadedly connected to the first support plate, the other end of the feed pipe is slidably connected to the adjustment rod for closing the injection port, the end of the adjustment rod adjacent to the injection port is made of a heat-insulating material, and the gap between the feed pipe and the internal adjustment rod forms a feed channel.

[0008] Preferably, the feed tube is sleeved inside the injection port, the part of the injection port adjacent to the product cavity is a first frustum surface, the outer side surface of the feed tube adjacent to the product cavity is a second frustum surface, the inner side surface of the feed tube adjacent to the product cavity is a third frustum surface, the first frustum surface is in contact with the second frustum surface, the end of the adjusting rod adjacent to the product cavity is a frustum-shaped structure, the frustum-shaped structure is matched with the third surface, the first frustum surface, the second frustum surface, the third frustum surface, and the small mouth end of the frustum-shaped structure are the same size and are located at the same position.

[0009] Preferably, the first support plate is fixedly connected to the runner plate, the first heat insulation plate is fixedly connected between the runner plate and the fixed template, an injection runner is provided in the runner plate, mounting holes for the feed pipe to pass through are provided on the first heat insulation plate and the runner plate, a through hole connecting the injection runner and the feed channel is provided on the feed pipe, each of the through holes is evenly distributed in a ring shape around the axis of the feed pipe, and the parts of the feed pipe located on both sides of the through hole are in seamless contact with the runner plate.

[0010] Preferably, each of the regulating mechanisms includes a fixed block, each of the fixed blocks is fixedly connected to the second support plate, each of the fixed blocks is slidably connected to the clamping block, each of the clamping blocks is located on both sides of the push rod, and the sliding direction of each of the clamping blocks is inclined toward the push rod toward the product cavity, a first elastic member made of elastic material is installed between each of the clamping blocks, one end of the push rod is covered with a top cover, a second elastic member made of elastic material is installed between one end of the top cover and one end of the push rod, the other end of the top cover is located between the push rod and the third support plate, and a connecting rod is rotatably connected between the top cover and the clamping block.

[0011] Preferably, the push rod is slidably connected to the movable template, and a push plate is installed at one end of the push rod adjacent to the product cavity. The radial dimension of the push plate is larger than the radial dimension of the push rod, and the surface of the push plate away from the push rod is in contact with the product cavity. A slot hole is provided on the movable template to cooperate with the push plate and the push rod.

[0012] Preferably, a second heat insulation plate is installed between the second support plate and the movable template, a heating channel is opened on the movable template, a pillar is installed between the first support plate and the third support plate, the second support plate is slidably connected to the pillar, the first support plate is fixedly connected to the fixed end of the telescopic member, and the movable end of each telescopic member is fixedly connected to the second support plate.

[0013] The present invention provides a flow-free BMC mold that is easy to unload, and has the following advantages compared with the prior art:

[0014] The adjustment mechanism ensures that no excess injection material remains at the injection port, allowing the mold to inject the appropriate amount of material each time. The adjustment mechanism also isolates temperature transfer between the feed channel and the fixed platen, preventing the BMC material in the product cavity from affecting the BMC material in the feed channel during heating. A negative pressure device maintains a negative pressure in the negative pressure chamber, connecting the product cavity and the negative pressure chamber via an exhaust channel, preventing bubbles from forming within the material in the product cavity during production. The adjustment mechanism ensures that when the pressure in the product cavity changes, the push rod remains fixed relative to the movable platen, without affecting the molding of the product. Once the product is formed, the adjustment mechanism is activated by external force, causing the push rod to move relative to the second support plate, facilitating the separation of the product from the movable platen for easier unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0016] Figure 2 It is a schematic top view of the present invention.

[0017] Figure 3 It is a schematic diagram of the AA direction of the present invention.

[0018] Figure 4 It is a schematic diagram of the BB direction of the present invention.

[0019] Figure 5 It is a schematic diagram of the CC direction of the present invention.

[0020] Figure 6 It is an enlarged schematic cross-sectional view of the regulating mechanism of the present invention.

[0021] Figure 7 It is an enlarged schematic diagram of the exhaust passage of the present invention.

[0022] In the figure: 1 fixed template, 2 movable template, 3 product cavity, 4 negative pressure cavity, 5 adjustment mechanism, 5.1 feed pipe, 5.2 adjustment rod, 6 control mechanism, 6.1 fixed block, 6.2 clamping block, 6.3 first elastic member, 6.4 second elastic member, 6.5 top cover, 6.6 connecting rod, 6.7 push plate, 6.8 slot, 7 exhaust channel, 8 proximity switch installation position, 9 injection molding port, 10 feed channel, 11 first support plate, 12 second support plate, 13 third support plate, 14 push rod, 15 runner plate, 16 first heat insulation plate, 17 second heat insulation plate, 18 injection runner, 19 mounting hole, 20 through hole, 21 heating channel, 22 pillar, 23 telescopic member, 24 first annular disk, 25 first annular plate, 26 second annular disk, 27 second annular plate, 28 first opening, 29 second opening. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0025] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0026] See also Figure 1-7 The present invention provides a technical solution: a flow channel-free BMC mold that is easy to unload, comprising a movable template 2 and a fixed template 1, a product cavity 3 and a negative pressure cavity 4 are provided between the movable template 2 and the fixed template 1, an exhaust channel 7 connecting the product cavity 3 and the negative pressure cavity 4 is provided between the movable template 2 and the fixed template 1, wherein the exhaust channel 7 is provided on the fixed template 1, and a proximity switch installation position 8 is provided at one end of the exhaust channel 7 adjacent to the product cavity 3, and a proximity switch installed at the proximity switch installation position 8 is installed with a heat insulating material such as aerogel or porous vacuum silicon, an injection port 9 is provided at the product cavity 3 of the fixed template 1, each injection port 9 is connected to a feed channel 10, and an adjustment mechanism 5 for adjusting the size of the injection port is installed at the injection port 9 of the fixed template 1, and when the injection port 9 is closed, the temperature transfer between the feed channel 10 and the fixed template 1 is blocked by the adjustment mechanism 5, and there is a seamless structure between the injection port 9 and the product cavity 3, wherein the exhaust channel 7 and the product cavity 3 are connected. The connection point is the exhaust port. There are multiple exhaust ports, which may be determined according to actual conditions. The opening and closing of the injection port 9 are controlled by a proximity switch. The proximity switch installation position 8 may be one, which is located at the exhaust port where the injection molding material such as BMC finally arrives. When the proximity switch at the proximity switch installation position 8 detects the injection molding material, the injection port 9 is closed. There may also be multiple proximity switch installation positions 8, the number of which is the same as the number of exhaust ports. When the proximity switches at all the proximity switch installation positions 8 detect the injection molding material, the injection molding port 9 is closed. When the injection molding port 9 is closed, there is no gap between the injection molding port 9 and the product cavity 3, where the product cavity 3 is where the product is located, so that there is no excess injection molding material remaining at the injection molding port 9, so that the mold can inject the appropriate amount of material each time. At the same time, the adjustment mechanism 5 isolates the temperature transfer between the feed channel 10 and the fixed template 1 to prevent the BMC material in the product cavity 3 from affecting the BMC material in the feed channel 10 during heating.

[0027] In one embodiment, it also includes a first support plate 11, a second support plate 12, and a third support plate 13. The second support plate 12 is located between the first support plate 11 and the third support plate 13. The second support plate 12 is fixed relative to the movable template 2. The second support plate 12 is slidably connected to the push rod 14 in contact with the product cavity 3. The second support plate 12 is installed with a regulating mechanism 6 for controlling the movement of the push rod 14 relative to the second support plate 12, and a structure is formed in which the push rod 14 is fixed relative to the second support plate 12 when the pressure in the product cavity 3 changes, and the push rod 14 moves relative to the second support plate 12 when the regulating mechanism 6 is subjected to external force. When the pressure in the product cavity 3 changes, such as in a negative pressure state, the push rod 14 is fixed relative to the second support plate 12, that is, fixed relative to the movable template 2, and does not affect the molding of the product. After the product is formed, the regulating mechanism 6 is acted upon by external force, so that the push rod 14 moves relative to the second support plate 12, thereby facilitating the separation of the product from the movable template 2 and facilitating unloading.

[0028] In one embodiment, each adjustment mechanism 5 includes a feed pipe 5.1 made of a heat-insulating material. The feed pipe 5.1 can be a pipe made of polytetrafluoroethylene. The surface of the pipe is first coated with HK350 nano thermal barrier insulation coating, and then the outer side of the pipe is coated with an ultra-thin nano silicon aerogel insulation film. The feed pipe 5.1 can also be made of other suitable heat-insulating materials. One end of the feed pipe 5.1 is connected to the injection port 9, and the other end of the feed pipe 5.1 is threadedly connected to the first support plate 11. The other end of the feed pipe 5.1 is slidably connected to the adjustment rod 5.2 for closing the injection port 9. One end of the section rod 5.2 adjacent to the injection port 9 is made of a heat-insulating material. The adjusting rod 5.2 can be made of polytetrafluoroethylene, and the rod surface is coated with HK350 nano-thermal barrier coating. The adjusting rod 5.2 can also be made of other suitable materials. The gap between the feed pipe 5.1 and the internal adjusting rod 5.2 forms a feed channel 10. The feed pipe 5.1 is threadedly connected to the first support plate 11, so that the lower end of the feed pipe 5.1 contacts and cooperates with the surface of the injection port 9. The opening and closing of the injection port 9 are controlled by the sliding of the adjusting rod 5.2 relative to the feed pipe 5.1.

[0029] In one embodiment, the adjusting rod 5.2 is fixed to the movable end of the electric telescopic rod by welding or adhesive bonding, and the fixed end of the electric telescopic rod is fixed to the feed pipe 5.1 by welding or other suitable fixing methods such as screw fixing. The proximity switch at the proximity switch installation position 8 is connected to the electric telescopic rod through a circuit, so that the proximity switch controls the extension and retraction of the electric telescopic rod.

[0030] In one embodiment, the feed pipe 5.1 is sleeved inside the injection port 9, and the portion of the injection port 9 adjacent to the product cavity 3 is a first truncated cone curved surface, the outer side surface of the feed pipe 5.1 adjacent to the product cavity 3 is a second truncated cone curved surface, and the inner side surface of the feed pipe 5.1 adjacent to the product cavity 3 is a third truncated cone curved surface. The first truncated cone curved surface and the second truncated cone curved surface are in contact with each other, and the end of the adjusting rod 5.2 adjacent to the product cavity 3 is a truncated cone structure, which is matched with the third curved surface. The first truncated cone curved surface, the second truncated cone curved surface, the third truncated cone curved surface, and the truncated cone curved surface are in contact with each other. The small ends of the table-like structures have the same size and are located at the same position. When the adjustment rod 5.2 closes the injection port 9, there is no gap between the injection port 9 and the product cavity 3. At the same time, the feed pipe 5.1 is made of a heat-insulating material, and the end of the adjustment rod 5.2 adjacent to the injection port 9 is also made of a heat-insulating material, which blocks the temperature transfer between the feed channel 10 and the fixed mold plate 1. In this way, when the injection port 9 is closed, the adjustment mechanism 5 blocks the temperature transfer between the feed channel 10 and the fixed mold plate 1, and there is no gap between the injection port 9 and the product cavity 3.

[0031] In one embodiment, the first support plate 11 is bolted to the runner plate 15, and the first insulation plate 16 is bolted between the runner plate 15 and the fixed mold plate 1. The first insulation plate 16 is made of a suitable material such as a vacuum insulation panel. An injection molding runner 18 is provided in the runner plate 15. Mounting holes 19 for the feed pipe 5.1 to pass through are provided on the first insulation plate 16 and the runner plate 15. A through hole 20 is provided on the feed pipe 5.1 to connect the injection molding runner 18 and the feed channel 10. The through holes 20 are evenly distributed in a ring shape around the axis of the feed pipe 5.1. The parts of the feed pipe 5.1 located on both sides of the through hole 20 are in seamless contact with the runner plate 15. The through hole 20 prevents the rotation of the feed pipe 5.1 from affecting the connection between the injection molding runner 18 and the feed channel 10.

[0032] In one embodiment, the injection channel 18 is connected to a BMC injection molding machine, and the inner wall of the injection port 9 is coated with HK350 nanometer thermal barrier coating.

[0033] In one embodiment, each regulating mechanism 6 includes a fixed block 6.1, each fixed block 6.1 is welded and fixed to the second support plate 12, each fixed block 6.1 is slidably connected to a clamping block 6.2 through a slide rail, each clamping block 6.2 is located on both sides of the push rod 14, and each push rod 14 has two clamping blocks 6.2, and the sliding direction of each clamping block 6.2 is inclined toward the push rod 14 toward the product cavity 3, and a first elastic member 6.3 made of an elastic material such as a spring is clamped and fixed between each clamping block 6.2, and one end of the push rod 14 is covered with a top cover 6.5, and a second elastic member 6.4 made of an elastic material such as a spring is clamped between one end of the top cover 6.5 and one end of the push rod 14, and the other end of the top cover 6.5 is located at A connecting rod 6.6 is rotatably connected between the push rod 14 and the third support plate 13, and between the top cover 6.5 and the clamping block 6.2. When the product cavity 3 is in a negative pressure state, the push rod 14 tends to move upward. At this time, the push rod 14 is clamped and fixed by the cooperation of each clamping block 6.2 and the fixed block 6.1 to prevent the push rod 14 from moving relative to the second support plate 12. When the second support plate 12 moves toward the third support plate 13, so that the top cover 6.5 contacts the third support plate 13, the third support plate 13 pushes the top cover 6.5 to move upward, and then the clamping blocks 6.2 move toward the sides of the push rod 14, so that the top cover 6.5 pushes the push rod 14 to move upward, thereby facilitating the separation of the product from the movable template 2.

[0034] In one embodiment, the push rod 14 is slidably connected to the movable plate 2. A push plate 6.7 is installed at the end of the push rod 14 adjacent to the product cavity 3. The push plate 6.7 and the push rod 14 are an integral structure. The radial dimension of the push plate 6.7 is larger than the radial dimension of the push rod 14. The surface of the push plate 6.7 away from the push rod 14 contacts the product cavity 3. The movable plate 2 is provided with a slot 6.8 that cooperates with the push plate 6.7 and the push rod 14. The movable plate 2 is slidably connected to the push rod 14 through the slot 6.8. When the product cavity 3 is under positive pressure, the push plate 6.7 is subjected to a downward force, and the slot 6.8 is engaged. 8 prevents the push rod 14 from moving downward, so that the push rod 14 is fixed relative to the second support plate 12. In addition, when the product chamber 3 is in a negative pressure state, the clamping blocks 6.2 cooperate with the fixing block 6.1 to clamp and fix the push rod 14 to prevent the push rod 14 from moving relative to the second support plate 12. When the top cover 6.5 is subjected to an external force such as that applied by the third support plate 13, the top cover 6.5 pushes the push rod 14 to move upward, thereby forming a structure in which the push rod 14 is fixed relative to the second support plate 12 when the pressure in the product chamber 3 changes, and the push rod 14 moves relative to the second support plate 12 when the regulating mechanism 6 is subjected to an external force.

[0035] In one embodiment, a second insulation board 17 is bolted between the second support plate 12 and the movable template 2. The second insulation board 17 is made of a suitable material such as a vacuum insulation board. A heating channel 21 is provided on the movable template 2. A pillar 22 is bolted between the first support plate 11 and the third support plate 13. The second support plate 12 is slidably connected to the pillar 22. The first support plate 11 is bolted to the fixed end of the telescopic member 23. The movable end of each telescopic member 23 is bolted to the second support plate 12. The telescopic member 23 is a suitable component such as an electric telescopic rod, a hydraulic pump, etc. The position of the second support plate 12 between the first support plate 11 and the third support plate 13 is adjusted by the telescopic rod.

[0036] In one embodiment, a sliding hole is provided on the second heat insulation plate 17 for the push rod 14 to pass through, and the second heat insulation plate 17 is slidably connected to the push rod 14 through the sliding hole.

[0037] In one embodiment, a first annular disk 24 is installed on the outer side of the movable template 2, and a first annular plate 25 is fixedly connected to the first annular disk 24. The first annular disk 24, the first annular plate 25 and the movable template 2 are an integral structure. A second annular disk 26 is installed on the outer side of the fixed template 1, and a second annular plate 27 is fixedly connected to the second annular disk 26. There are two second annular plates 27. The second annular disk 26, the second annular plate 27 and the fixed template 1 are an integral structure. Each second annular plate 27 is arranged to slide relative to the first annular plate 25. A sealing ring is bonded and fixed at the connection between each second annular plate 27 and the first annular plate 25. When the movable template When the first annular disc 24, the second annular disc 26, the second annular plate 27, and the first annular plate 25 cooperate with the movable plate 2 and the fixed plate 1 to form an annular tubular structure with a negative pressure chamber 4 inside. The fixed plate 1 is provided with a first opening 28 and a second opening 29 for connecting the negative pressure chamber 4 with the outside world. A valve is installed on the first opening 28, and the second opening 29 is connected to a negative pressure device, such as a suitable device such as a vacuum pump. The negative pressure device puts the negative pressure chamber 4 in a negative pressure state. The product chamber 3 is connected to the negative pressure chamber 4 through the exhaust channel 7, thereby preventing bubbles from being generated inside the material in the product chamber 3 during production.

[0038] The present invention has been described in detail above by way of specific embodiments and examples, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may make many variations and improvements, which should also be considered within the scope of protection of the present invention.

Claims

1. A runnerless BMC mold for easy unloading, comprising a movable mold plate (2) and a fixed mold plate (1), characterized in that: A product cavity (3) and a negative pressure cavity (4) are provided between the movable template (2) and the fixed template (1); an exhaust channel (7) communicating with the product cavity (3) and the negative pressure cavity (4) is provided between the movable template (2) and the fixed template (1); a proximity switch installation position (8) is provided at one end of the exhaust channel (7) adjacent to the product cavity (3); an injection port (9) is provided on the fixed template (1) at the product cavity (3); each injection port (9) is communicated with a feed channel (10); an adjustment mechanism (5) for adjusting the size of the injection port is installed on the fixed template (1) at the injection port (9); and when the injection port (9) is closed, the adjustment mechanism (5) blocks the temperature transfer between the feed channel (10) and the fixed template (1), and a structure is formed in which there is no gap between the injection port (9) and the product cavity (3); Each of the regulating mechanisms (5) includes a feed pipe (5.1) made of a heat-insulating material, one end of the feed pipe (5.1) is connected to the injection port (9), the other end of the feed pipe (5.1) is threadedly connected to the first support plate (11), the other end of the feed pipe (5.1) is slidably connected to an regulating rod (5.2) for closing the injection port (9), one end of the regulating rod (5.2) adjacent to the injection port (9) is made of a heat-insulating material, and the gap between the feed pipe (5.1) and the regulating rod (5.2) inside forms a feed channel (10); The feed pipe (5.1) is sleeved inside the injection port (9), the portion of the injection port (9) adjacent to the product cavity (3) is a first truncated cone curved surface, the outer side surface of the feed pipe (5.1) adjacent to the product cavity (3) is a second truncated cone curved surface, the inner side surface of the feed pipe (5.1) adjacent to the product cavity (3) is a third truncated cone curved surface, the first truncated cone curved surface and the second truncated cone curved surface are in contact with each other, the end of the regulating rod (5.2) adjacent to the product cavity (3) is a truncated cone-shaped structure, the truncated cone-shaped structure is matched with the third curved surface, the first truncated cone curved surface, the second truncated cone curved surface, the third truncated cone curved surface and the small mouth end of the truncated cone-shaped structure are of the same size and are located at the same position.

2. The runnerless BMC mold for easy unloading according to claim 1, characterized in that: The invention also includes a first support plate (11), a second support plate (12), and a third support plate (13), wherein the second support plate (12) is located between the first support plate (11) and the third support plate (13), the second support plate (12) and the movable plate (2) are fixed relative to each other, the second support plate (12) is slidably connected to a push rod (14) in contact with the product cavity (3), and a regulating mechanism (6) for controlling the movement of the push rod (14) relative to the second support plate (12) is installed on the second support plate (12), thereby forming a structure in which the push rod (14) is fixed relative to the second support plate (12) when the pressure in the product cavity (3) changes, and the push rod (14) moves relative to the second support plate (12) when the regulating mechanism (6) is subjected to an external force.

3. The runnerless BMC mold for easy unloading according to claim 1, characterized in that: A first annular disc (24) is installed on the outer side of the movable template (2), and a first annular plate (25) is fixedly connected to the first annular disc (24). A second annular disc (26) is installed on the outer side of the fixed template (1), and a second annular plate (27) is fixedly connected to the second annular disc (26). Each second annular plate (27) is arranged to slide relative to the first annular plate (25), and a sealing ring is installed at the connection between each second annular plate (27) and the first annular plate (25). When the movable template (2) and the fixed template (1) are matched, the first annular disc (24), the second annular disc (26), the second annular plate (27), and the first annular plate (25) cooperate with the movable template (2) and the fixed template (1) to form an annular tubular structure with a negative pressure chamber (4) inside. A first opening (28) and a second opening (29) are provided on the fixed template (1) for connecting the negative pressure chamber (4) with the outside world. A valve is installed on the first opening (28), and the second opening (29) is connected to a negative pressure device.

4. The runnerless BMC mold for easy unloading according to claim 2, characterized in that: The first support plate (11) is fixedly connected to the flow channel plate (15), and the first heat insulation plate (16) is fixedly connected between the flow channel plate (15) and the fixed mold plate (1). An injection flow channel (18) is provided in the flow channel plate (15), and mounting holes (19) for the feed pipe (5.1) to pass through are provided on the first heat insulation plate (16) and the flow channel plate (15). A through hole (20) connecting the injection flow channel (18) and the feed channel (10) is provided on the feed pipe (5.1), and the through holes (20) are evenly distributed in a ring shape around the axis of the feed pipe (5.1), and the portions of the feed pipe (5.1) located on both sides of the through hole (20) are in seamless contact with the flow channel plate (15).

5. The runnerless BMC mold for easy unloading according to claim 2, characterized in that: Each of the regulating mechanisms (6) comprises a fixed block (6.1), each of the fixed blocks (6.1) is fixedly connected to the second support plate (12), each of the fixed blocks (6.1) is slidably connected to a clamping block (6.2), each of the clamping blocks (6.2) is located at both sides of the push rod (14), and the sliding direction of each of the clamping blocks (6.2) is inclined toward the push rod (14) toward the product cavity (3), a first elastic member (6.3) made of elastic material is installed between each of the clamping blocks (6.2), one end of the push rod (14) is covered with a top cover (6.5), a second elastic member (6.4) made of elastic material is installed between one end of the top cover (6.5) and one end of the push rod (14), the other end of the top cover (6.5) is located between the push rod (14) and the third support plate (13), and a connecting rod (6.6) is rotatably connected between the top cover (6.5) and the clamping block (6.2).

6. The runnerless BMC mold for easy unloading according to claim 5, characterized in that: The push rod (14) is slidably connected to the movable template (2); a push plate (6.7) is installed at one end of the push rod (14) adjacent to the product cavity (3); the radial dimension of the push plate (6.7) is larger than the radial dimension of the push rod (14); the surface of the push plate (6.7) away from the push rod (14) is in contact with the product cavity (3); and a slot (6.8) is provided on the movable template (2) to match the push plate (6.7) and the push rod (14).

7. The runnerless BMC mold for easy unloading according to claim 2, characterized in that: A second heat insulation plate (17) is installed between the second support plate (12) and the movable plate (2), a heating channel (21) is provided on the movable plate (2), a support (22) is installed between the first support plate (11) and the third support plate (13), the second support plate (12) is slidably connected to the support (22), the first support plate (11) is fixedly connected to the fixed end of the telescopic member (23), and the movable end of each telescopic member (23) is fixedly connected to the second support plate (12).

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