Bilateral three-fork type multi-composite rubber extruder head

Abstract

The invention discloses a double-side three-fork type multi-composite rubber extruding machine head which comprises a fixed die fixedly arranged, an upper movable die arranged above the fixed die in an overturning mode and a lower movable die arranged below the fixed die in an overturning mode, and upper locking faces are arranged on the left side and the right side of the top face of the upper movable die after a die unit is closed. Lower locking surfaces are arranged on the left side and the right side of the bottom surface of the lower movable mold; vertical rear locking surfaces are arranged on the left side and the right side of the back surface of the fixed mold; the two locking doors are arranged on the left side and the right side of the mold unit respectively, the middle of each locking door is connected with a first driving component for driving the locking door to move close to or away from the fixed mold, each locking door is provided with three locking arms, and the locking portions at the tail ends of the locking arms can be embedded into the upper locking face, the lower locking face and the rear locking face respectively. The double-side three-fork type multi-composite rubber extruding machine head can provide high-precision repeated positioning, the stability and repeatability of a mold in the extruding process are ensured, and meanwhile the occupied area and the maintenance difficulty of the extruding machine head can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of rubber processing, in particular to a double-sided three-pronged multi-composite rubber extruder head. Background Art

[0002] Extruders are essential equipment in rubber machinery. With the market's growing demand for high-performance extruders, companies are placing higher demands on quality, efficiency, and precision in rubber product production. Compound rubber extruders are used in a variety of industries, including rubber product production, the automotive industry, the conveyor belt industry, and the power industry.

[0003] The composite rubber extruder unit primarily consists of a feeding system, extrusion unit, die assembly, temperature control system, and hydraulic system. The feeding system's primary function is to continuously and automatically supply compounded rubber according to production requirements, ensuring dynamic stability. The extrusion unit's primary function is to reprocess the compounded rubber provided by the feeding system to the specified process temperature and state. The die assembly functions as a mold, compounding the compounded rubber provided by the extrusion unit into high-precision, dimensionally stable semi-finished products. The temperature control system's primary function is to adjust the temperature parameters of the production equipment to achieve control of the compound's process temperature. The hydraulic system's primary function is to provide hydraulic pressure for opening, closing, and locking the die assembly.

[0004] The extruder head plays a crucial role in the manufacturing process. It transforms the rubber raw materials processed by the rubber mixer into the various components required for the product through precise mold shapes. The size and shape accuracy of these components have a profound impact on the product's performance and quality. The extruder head's opening and closing movements must be highly repeatable and consistent to meet the demands of mass production. The locking section is a critical component of the extruder head, responsible for maintaining the stability and precise positioning of the mold. Furthermore, when the composite head is locked, the sealing of the parting surfaces between the various mold bodies must be guaranteed. The mold bodies must be sufficiently rigid to prevent deformation under high internal pressure from causing rubber leakage.

[0005] Chinese utility model patent CN201012535Y discloses a hydraulic laminating die head for a multi-rubber extruder. The locking door features a C-shaped, pull-back locking mechanism, which wastes rear die head space and occupies a large footprint. Furthermore, the complexity of the locking door structure can increase maintenance difficulty and time. This complex structure, with its increased number of mechanical components and more complex operating principles, can complicate equipment maintenance and troubleshooting. Maintenance work can require more specialized technical expertise and take longer, impacting production continuity and stability. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a double-sided three-pronged multi-composite rubber extruder head, which can provide high-precision repeated positioning, ensure the stability and repeatability of the mold during the extrusion process, and at the same time reduce the footprint and maintenance difficulty of the extruder head.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A double-sided three-pronged multi-composite rubber extruder head, comprising:

[0009] The mold unit includes a fixed mold, an upper movable mold that is flip-type and is located above the fixed mold, and a lower movable mold that is flip-type and is located below the fixed mold. When the fixed mold, the upper movable mold, and the lower movable mold are closed, a flow channel and a mold cavity for casting the product are formed therein. After the mold unit is closed, it is locked by a locking door; and

[0010] Hydraulic system provides driving force for opening, closing and locking of the mold unit;

[0011] Its characteristics are:

[0012] After the mold units are closed, the closing surfaces of the two adjacent molds are both broken line surfaces, with upper locking surfaces on both sides of the top surface of the upper movable mold, lower locking surfaces on both sides of the bottom surface of the lower movable mold, and vertical rear locking surfaces on both sides of the back surface of the fixed mold.

[0013] There are two locking doors, which are arranged on the left and right sides of the mold unit. The middle part of the locking door is connected to a first driving component that drives it to move closer to or away from the fixed mold. The locking door has three locking arms, and the locking parts at the ends of the locking arms can be respectively engaged with the upper locking surface, the lower locking surface and the rear locking surface.

[0014] A further technical solution is that the upper locking surface is set to be tilted downward from inside to outside, the lower locking surface is set to be tilted upward from inside to outside, and the rear locking surface is set to be tilted backward from outside to inside, and the locking part of the locking arm is set the same as the corresponding locking surface.

[0015] A further technical solution is that the upper locking surface is arranged to be tilted downward from the back to the front, and the lower locking surface is arranged to be tilted upward from the back to the front.

[0016] A further technical solution is that locking linings are fixed to the upper locking surface, the lower locking surface, the rear locking surface and the locking portion at the end of the locking arm.

[0017] A further technical solution is that the middle portion of the front side of the lock door has a recessed area recessed backwards, and the recessed area does not protrude from the front side of the mold unit.

[0018] A further technical solution is that a guide rail is provided below the lock door, the guide rail is arranged along the moving direction of the lock door, and the lock door is slidably matched with the guide rail.

[0019] A further technical solution is that the upper movable mold includes an upper middle mold and an upper mold.

[0020] A further technical solution is that a first pivot for mounting the upper movable mold is provided above the fixed mold, a first mounting bracket is fixed to the rear side of the upper portion of the fixed mold, and a first hydraulic cylinder for driving the upper movable mold to open and close connects the top of the upper movable mold to the first mounting bracket in an oblique manner;

[0021] A second pivot for mounting the lower movable mold is provided below the fixed mold, a second mounting bracket is fixed to the rear side below the fixed mold, and a second hydraulic cylinder for driving the lower movable mold to open and close connects the bottom of the lower movable mold to the second mounting bracket in an oblique manner.

[0022] A further technical solution is that the top of the upper movable mold is provided with a locking shaft, and the first mounting frame is provided with a locking arm that can be hooked with the locking shaft after the mold is opened.

[0023] A further technical solution is that the outer side surface of the lower part of the fixed mold has a recessed area, and a head base for supporting the fixed mold is provided below the fixed mold, and the head base includes:

[0024] Two support plates are placed on the left and right sides of the fixed mold, with the upper ends of the support plates embedded in the recessed area and fixed to the fixed mold, the top surfaces of the support plates are in contact with the fixed mold, and the outer sides of the support plates do not protrude from the recessed area; and

[0025] Connecting plate, connects and fixes the two support plates.

[0026] The beneficial effects of adopting the above technical solution are:

[0027] The bilateral three-pronged multi-composite rubber extruder head has two locking doors, which are respectively arranged on the left and right sides of the mold unit. The middle part of the locking door is connected to a first driving component that drives it to move closer to or away from the fixed mold. The locking door has three locking arms. The locking parts at the ends of the locking arms can respectively engage with the upper locking surface on the top of the upper movable mold, the lower locking surface on the bottom of the lower movable mold, and the rear locking surface on the rear side of the fixed mold, forming a three-pronged locking structure.

[0028] Dispersed pressure is one of the key features of the three-pronged locking mechanism. Through three independent locking points, the pressure is evenly distributed on the head part corresponding to the mold, thereby dispersing the pressure and reducing the load of a single locking point, which helps to improve the stability of the mold and prevent displacement during the extrusion process.

[0029] The three-pronged locking structure can provide high-precision repeated positioning, ensuring that the position of the mold is consistent during each production process, making the shape and size of the mold cavity stable, thereby achieving precise molding of rubber parts, ensuring the stability and repeatability of the mold during the extrusion process, and improving the quality of product parts and production efficiency.

[0030] The three-pronged locking structure enables quick and intuitive operation of locking and releasing the mold, significantly reducing downtime during production and improving production continuity and stability.

[0031] Compared to traditional pull-back locking mechanisms, this three-pronged locking structure reduces the complexity of the locking mechanism, saves space at the rear of the machine head, simplifies the configuration, and achieves a lightweight design with a smaller footprint, which is beneficial for optimizing equipment layout and production lines. Furthermore, due to the reduction in the number of parts, material, processing, and assembly costs are also optimized. This improvement also helps to improve product production efficiency, reduce production costs, lower failure rates, and improve maintainability. It allows operators to more easily perform routine maintenance and troubleshooting, further reducing downtime and maintenance costs, and enhancing the overall competitiveness of the product manufacturing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Figure 1 This is a schematic diagram of the axonometric structure of the present invention Figure 1 ;

[0034] Figure 2 This is a schematic diagram of the axonometric structure of the present invention Figure 2 ;

[0035] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0036] Figure 4 It is a right side structural schematic diagram of the present invention;

[0037] Figure 5 yes Figure 4 The schematic diagram of the structure behind the locked doors on both sides is hidden;

[0038] Figure 6 This is a schematic diagram of the axonometric structure of the door lock in the present invention;

[0039] Figure 7 This is a schematic diagram of the axonometric structure of the fixed mold in the present invention;

[0040] Figure 8 Schematic diagram of the top view of the fixed mold in the present invention;

[0041] Figure 9This is a schematic diagram of the axonometric structure of the fixed mold part after assembly in the present invention;

[0042] Figure 10 yes Figure 9 Schematic diagram of the rear view structure;

[0043] Figure 11 It is a structural schematic diagram of the locking arm in the present invention;

[0044] Figure 12 It is a right side structural schematic diagram of the left side locking door in the present invention;

[0045] Figure 13 It is a rear view structural diagram of the left side locking door in the present invention;

[0046] Figure 14 It is a schematic diagram of the top structure of the left side locking door in the present invention. DETAILED DESCRIPTION

[0047] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0049] like Figures 1 to 11 The figure shows a double-sided, three-pronged multi-compound rubber extruder head, which includes a die unit. As a key component in extrusion molding, the die unit's shape, size, and structural design directly determine the final product quality. A hydraulic system provides the driving force for opening, closing, and locking the die unit. A temperature control system regulates the operating temperature of the die unit, typically using electric heating, with a heater and temperature control device controlling the operating temperature.

[0050] The mold unit comprises a fixed fixed mold 10, an upper movable mold 20 tiltably positioned above the fixed mold 10, and a lower movable mold 30 tiltably positioned below the fixed mold 10. When the fixed mold 10, upper movable mold 20, and lower movable mold 30 are combined, a runner and mold cavity for casting the product are formed within them. After the mold unit is closed, a locking door 40 is used to lock it. Depending on production needs, the upper movable mold 20 and lower movable mold 30 can be combined to form multiple mold bodies, each of which is connected to a hydraulic cylinder to drive its rotation.

[0051] Above the fixed mold 10, there is a first pivot 110 for mounting the upper movable mold 20. The upper movable mold 20 is rotatably mounted on the first pivot 110. When there are multiple upper movable molds 20, multiple mold bodies can be mounted on the same pivot. A first mounting bracket 120 is fixed to the rear side above the fixed mold 10. A first hydraulic cylinder 210, which drives the upper movable mold 20 to open and close, connects the top of the upper movable mold 20 to the first mounting bracket 120 in an oblique manner. The two ends of the first hydraulic cylinder 210 are rotatably fixed to the upper movable mold 20 and the first mounting bracket 120, respectively. When the mold needs to be closed, the first hydraulic cylinder 210 extends, driving the upper movable mold 20 to tilt downward about the first pivot 110 to the closed position, and then stops. When the mold needs to be opened, the first hydraulic cylinder 210 shortens, driving the upper movable mold 20 to tilt upward about the first pivot 110 to the open position, and then stops.

[0052] Since the upper movable mold 20 is flipped upward to open the mold, it only relies on the first hydraulic cylinder 210 to pull the upper movable mold 20 upward to maintain a stable open state, and the reliability is slightly poor. Therefore, a locking shaft 23 is provided on the top of the upper movable mold 20, and a locking arm 24 that can be hooked with the locking shaft 23 after the mold is opened is provided on the first mounting frame 120.

[0053] like Figure 11 As shown, the locking arm 24 includes a fixed base 241, a locking hook hydraulic cylinder 242, and a locking plate 243. The fixed base 241 is attached to and fixed to the first mounting bracket 120. The fixed end of the locking hook hydraulic cylinder 242 is rotatably connected to one end of the fixed base 241. The locking plate 243 is shaped like a triangle, with a first corner of the locking plate 243 rotatably connected to the other end of the fixed base 241, and a second corner of the locking plate 243 rotatably connected to the movable end of the locking hook hydraulic cylinder 242. The third corner of the locking plate 243 extends toward the locking shaft 23 and has a safety hook 244 connected to the locking shaft 23. The fixed base 241, the locking hook hydraulic cylinder 242, and the locking plate 243 form a triangular linkage mechanism. When the upper movable mold 20 is opened, the locking hook hydraulic cylinder 242 extends, which can drive the locking plate 243 to rotate downward and connect with the locking shaft 23, thereby improving the stability of the upper movable mold 20 after the mold is opened; when the upper movable mold 20 needs to be closed, the locking hook hydraulic cylinder 242 shortens, which can drive the locking plate 243 to rotate upward and separate from the locking shaft 23, thereby releasing the upper movable mold 20.

[0054] The number of locking shafts 23 and locking arms 24 corresponds to each other, and preferably two sets are provided symmetrically. When the upper movable mold 20 has multiple mold bodies, each mold body needs to be provided with a structure for the locking shaft 23 and locking arm 24 to cooperate.

[0055] Below the fixed mold 10 is a second pivot 130 for mounting the lower movable mold 30. If there are multiple lower movable molds 30, multiple mold bodies can be mounted on the same pivot. A second mounting bracket 140 is fixed to the rear side below the fixed mold 10. A second hydraulic cylinder 310, which drives the lower movable mold 30 to open and close, connects the bottom of the lower movable mold 30 to the second mounting bracket 140 in an oblique manner. The two ends of the second hydraulic cylinder 310 are rotatably fixed to the lower movable mold 30 and the second mounting bracket 140, respectively. When the molds need to be closed, the second hydraulic cylinder 310 extends, driving the lower movable mold 30 to tilt upward around the second pivot 130 to the closed position, and then stops. When the molds need to be opened, the second hydraulic cylinder 310 retracts, driving the lower movable mold 30 to tilt downward around the second pivot 130 to the open position, and then stops.

[0056] The first hydraulic cylinder 210 and the second hydraulic cylinder 310 are both integrated and installed close to the back of the machine head, which is conducive to the compactness of the overall spatial layout and does not affect the individual operation of other components.

[0057] After the mold units are closed, the closing surfaces of the two adjacent molds are both broken line surfaces. The inclined surfaces in the broken line surfaces can be used for guidance during mold closing and ensure stability after mold closing.

[0058] The top surface of the upper movable mold 20 has upper locking surfaces 101 on both sides, the bottom surface of the lower movable mold 30 has lower locking surfaces 102 on both sides, and the back surface of the fixed mold 10 has vertical rear locking surfaces 103 on both sides. Two locking gates 40 are provided, one on each side of the mold unit. A first driving member 41 is connected to the middle of each locking gate 40, driving it toward or away from the fixed mold 10. The locking gate 40 has three locking arms 42, the locking portions of which can engage with the upper locking surface 101, the lower locking surface 102, and the rear locking surface 103, respectively.

[0059] After the die head is locked, theoretically, the three locking surfaces on the mold unit and the corresponding mating surfaces on the lock door are completely aligned. Each lock door and mold unit is equipped with a locking liner 104 at each of the three locking locations: the upper locking surface 101, the lower locking surface 102, the rear locking surface 103, and the locking area at the end of the locking arm 42. Locking liner 104 is typically made of 40Cr, with the locking mating surface machined to a roughness of 3.2μm. This surface is quenched to increase its hardness and ensure wear resistance. Furthermore, the provision of locking liner 104 facilitates gap adjustment and replacement when worn.

[0060] The locking structure formed by the mold unit and the lock door after mold closing is suitable for locking multiple composite extruder heads. Figure 5 As shown, the upper movable mold 20 includes an upper middle mold 21 and an upper mold 22. After the mold is closed, the entire mold unit includes the upper mold 22, the upper middle mold 21, the fixed mold 10 and the lower movable mold 30 from top to bottom, forming a three-composite rubber extruder head.

[0061] The action process of the three-composite rubber extruder head during mold closing is as follows: the lower movable mold 30 is closed, the safety hook 244 of the upper middle mold 21 is opened, the upper middle mold 21 is closed, the safety hook 244 of the upper mold 22 is opened, the upper mold 22 is closed, and the locking doors 40 on both sides are locked.

[0062] The action process of the three-composite rubber extruder head when opening the mold is as follows: the locking doors 40 on both sides are released, the upper mold 22 is opened, the safety hook 244 of the upper mold 22 is buckled, the upper middle mold 21 is opened, the safety hook 244 of the upper middle mold 21 is buckled, and the lower movable mold 30 is opened.

[0063] The first drive member 41 comprises a locking hydraulic cylinder, which is arranged transversely. The end of its hydraulic cylinder rod is fixed to the middle of the outer side of the fixed mold 10, and the other end of the hydraulic cylinder rod extends through the middle of the locking door. The cylinder barrel of the locking hydraulic cylinder is fixed to the outer side of the locking door 40. During mold closing, the hydraulic system provides driving force to control the extension and retraction of the locking hydraulic cylinder. Because the mold unit connected to the end of the hydraulic cylinder rod is relatively heavy, while the locking door 40 connected to the other end of the hydraulic cylinder rod is lighter than the other end, under the reaction of the force, when the locking hydraulic cylinder extends and retracts, the end of the hydraulic cylinder rod is fixed differently, and the other end moves the locking door 40 closer to or away from the fixed mold 10. Locking is achieved by pushing the locking hydraulic cylinders on both sides toward the center, which can facilitate the closing of the mold bodies. Compared with the traditional C-type rear-pull locking structure that requires four locking cylinders and two guide rods for driving, the double-sided three-pronged multi-compound rubber extruder head of the present invention frees up space behind the die head, optimizes the spatial structure layout, and reduces the difficulty of operation. This improvement is of great significance for improving the operating efficiency of the production line and reducing costs.

[0064] The locking door 40 is similar to a three-jaw caliper structure, and is connected to the left and right sides of the fixed mold 10 through locking hydraulic cylinders. When locking is required, the locking doors 40 on both sides are closed toward the middle through the hydraulic system, and the middle mold body is fixed with its specific matching shape.

[0065] To ensure that the movement direction and height of the lock door 40 always meet design requirements, a guide rail 44 is provided below the lock door 40. The guide rail 44 can be a linear slide rail or a dovetail guide rail. On the one hand, the guide rail 44 supports the lock door 40 and prevents it from sinking. On the other hand, the guide rail 44 is arranged along the movement direction of the lock door 40. A slider 43 is fixed to the bottom of the lock door 40. The slider 43 cooperates with the guide rail 44 to slide the lock door 40 against the guide rail 44. The lock door 40 moves in the direction of the guide rail 44, thus ensuring that the lock door 40 effectively cooperates with each locking surface.

[0066] When locking the molds, in order to make the locking door 40 better contain the upper movable mold 20, the fixed mold 10 and the lower movable mold 30, the upper locking surface 101 and the lower locking surface 102 are symmetrically arranged up and down, as shown in FIG. Figure 3 As shown, the upper locking surface 101 is tilted downward from inside to outside, that is, the upper locking surface 101 on the left is tilted downward from right to left, and the upper locking surface 101 on the right is tilted downward from left to right. The preferred tilt angle of the upper locking surface 101 is 7.5°; the lower locking surface 102 is tilted upward from inside to outside, that is, the lower locking surface 102 on the left is tilted upward from right to left, and the lower locking surface 102 on the right is tilted upward from left to right. The preferred tilt angle of the lower locking surface 102 is 7.5°. Figure 8 As shown, the rear locking surface 103 is tilted backward from outside to inside, that is, the rear locking surface 103 on the left is tilted upward from left to right, and the rear locking surface 103 on the right is tilted upward from right to left. The preferred tilt angle of the rear locking surface 103 is 7.5°. The locking portion of the locking arm 42 is the same as the setting of the corresponding locking surface, as shown in FIG. Figure 13 and Figure 14 Moreover, during the movement of the locking door 40, the upper movable mold 20 can be pressed downward and the lower movable mold 30 can be pressed upward through the cooperation of the inclined surfaces, so that the upper and lower mold bodies are closed in place.

[0067] A step further, such as Figure 5 As shown, the upper locking surface 101 is tilted downward from back to front, preferably at an angle of 10°, and the lower locking surface 102 is tilted upward from back to front, preferably at an angle of 10°, forming a dual mechanical self-locking angle to ensure locking stability. The locking portion of the locking arm 42 is the same as the setting of the corresponding locking surface, as shown in FIG. Figure 12 shown.

[0068] The bilateral three-pronged multi-composite rubber extruder head has two locking gates 40, which are respectively arranged on the left and right sides of the mold unit. The middle part of the locking gate 40 is connected to a first driving member 41 that drives it to move closer to or away from the fixed mold 10. The locking gate 40 has three locking arms 42. The locking parts at the ends of the locking arms can respectively engage with the upper locking surface 101 at the top of the upper movable mold 20, the lower locking surface 102 at the bottom of the lower movable mold 30 and the rear locking surface 103 on the rear side of the fixed mold 10, forming a three-pronged locking structure.

[0069] Dispersed pressure is one of the key features of the three-pronged locking mechanism. Through three independent locking points, the pressure is evenly distributed on the head part corresponding to the mold, thereby dispersing the pressure and reducing the load of a single locking point, which helps to improve the stability of the mold and prevent displacement during the extrusion process.

[0070] The three-pronged locking structure can provide high-precision repeated positioning, ensuring that the position of the mold is consistent during each production process, making the shape and size of the mold cavity stable, thereby achieving precise molding of rubber parts, ensuring the stability and repeatability of the mold during the extrusion process, and improving the quality of product parts and production efficiency.

[0071] The three-pronged locking structure enables quick and intuitive operation of locking and releasing the mold, significantly reducing downtime during production and improving production continuity and stability.

[0072] Compared to traditional pull-back locking mechanisms, this three-pronged locking structure reduces the complexity of the locking mechanism, frees up space behind the machine head, simplifies configuration, and achieves a lightweight design. This reduces the equipment's footprint and facilitates equipment layout and production line optimization. Furthermore, the reduced number of parts optimizes material, processing, and assembly costs. This improvement also helps improve product production efficiency, lower production costs, reduce failure rates, and enhance maintainability, making routine maintenance and troubleshooting easier for operators. This further reduces downtime and maintenance costs, ultimately enhancing the overall competitiveness of the manufacturing industry.

[0073] The lower outer surface of the fixed mold 10 has a recessed area. Below the fixed mold 10, a head base 50 is located to support it. To facilitate installation of the entire machine, the head base 50 is no longer a one-piece design. The head base 50 includes two support plates 51 and a connecting plate 52. The two support plates 51 are placed on the left and right sides of the fixed mold 10, and the connecting plate 52 connects and fixes the two support plates 51 into a single body.

[0074] The upper end of the support plate 51 is embedded in the recessed area and secured to the fixed mold 10 by bolts or other means. The top surface of the support plate 51 contacts the fixed mold 10. A guide rail bracket 45 can be installed on the outer side of the support plate 51, and the guide rail 44 is secured to the upper surface of the guide rail bracket 45. Because the outer side of the support plate 51 does not protrude from the recessed area, there is no gap between the inner end of the guide rail 44 and the outer side of the fixed mold 10, ensuring that the locking door 40 moves on the guide rail 44 to meet the locking requirements. To enhance the support strength of the support plate 51, diagonal bracing ribs can also be provided on the outer surface of the support plate 51.

[0075] The machine head base 50 is divided into two independent left and right parts. Due to the change in the locking method of the door 40, the center of gravity of the whole machine head is shifted backward. The machine head base 50 needs to support the center of gravity of the machine head. The shape of the support plate 51 is preferably a right-angled trapezoid.

[0076] In addition, there is a recessed area 46 recessed backward in the middle of the front side of the locking door. The rear side of the recessed area 46 does not protrude from the front side of the mold unit. Preferably, the rear side of the recessed area 46 is flush with the front side of the mold unit, reserving space and installation position for the subsequent installation of the automatic mouth box switch.

[0077] The above are only preferred embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

Claims

1. A double-sided three-pronged multi-composite rubber extruder head, comprising: The mold unit includes a fixed mold, an upper movable mold that is flip-type and is located above the fixed mold, and a lower movable mold that is flip-type and is located below the fixed mold. When the fixed mold, the upper movable mold, and the lower movable mold are closed, a flow channel and a mold cavity for casting the product are formed therein. After the mold unit is closed, it is locked by a locking door; and Hydraulic system provides driving force for opening, closing and locking of the mold unit; Its characteristics are: After the mold units are closed, the closing surfaces of the two adjacent molds are both broken line surfaces, with upper locking surfaces on both sides of the top surface of the upper movable mold, lower locking surfaces on both sides of the bottom surface of the lower movable mold, and vertical rear locking surfaces on both sides of the back surface of the fixed mold. There are two locking doors, which are arranged on the left and right sides of the mold unit. The middle part of the locking door is connected to a first driving component that drives it to move closer to or away from the fixed mold. The locking door has three locking arms, and the locking parts at the ends of the locking arms can be respectively engaged with the upper locking surface, the lower locking surface and the rear locking surface.

2. The double-sided three-pronged multi-composite rubber extruder head according to claim 1, characterized in that: The upper locking surface is tilted downward from inside to outside, the lower locking surface is tilted upward from inside to outside, and the rear locking surface is tilted backward from outside to inside. The locking part of the locking arm is the same as the setting of the corresponding locking surface.

3. The double-sided three-pronged multi-composite rubber extruder head according to claim 2, characterized in that: The upper locking surface is arranged to be tilted downward from the back to the front, and the lower locking surface is arranged to be tilted upward from the back to the front.

4. The double-sided three-pronged multi-composite rubber extruder head according to claim 1, characterized in that: Locking linings are fixed on the upper locking surface, the lower locking surface, the rear locking surface and the locking portion at the end of the locking arm.

5. The double-sided three-pronged multi-composite rubber extruder head according to claim 1, characterized in that: The middle portion of the front side of the lock door has a recessed area recessed rearward, and the recessed area does not protrude from the front side of the mold unit.

6. The double-sided three-pronged multi-composite rubber extruder head according to claim 1, characterized in that: A guide rail is provided below the lock door, and the guide rail is arranged along the moving direction of the lock door. The lock door is slidably matched with the guide rail.

7. The double-sided three-pronged multi-composite rubber extruder head according to claim 1, characterized in that: The upper movable mold includes an upper middle mold and an upper mold.

8. The double-sided three-pronged multi-composite rubber extruder head according to claim 1, characterized in that: A first pivot for mounting the upper movable mold is provided above the fixed mold, a first mounting bracket is fixed to the rear side of the upper movable mold, and a first hydraulic cylinder for driving the upper movable mold to open and close connects the top of the upper movable mold to the first mounting bracket in an oblique manner; A second pivot for mounting the lower movable mold is provided below the fixed mold, a second mounting bracket is fixed to the rear side below the fixed mold, and a second hydraulic cylinder for driving the lower movable mold to open and close connects the bottom of the lower movable mold to the second mounting bracket in an oblique manner.

9. The double-sided three-pronged multi-composite rubber extruder head according to claim 8, characterized in that: The top of the upper movable mold is provided with a locking shaft, and the first mounting frame is provided with a locking arm that can be hooked with the locking shaft after the mold is opened.

10. The double-sided three-pronged multi-composite rubber extruder head according to claim 1, characterized in that: The outer side surface of the lower part of the fixed mold has a recessed area, and a head base for supporting the fixed mold is provided below the fixed mold, and the head base includes: Two support plates are placed on the left and right sides of the fixed mold, with the upper ends of the support plates embedded in the recessed area and fixed to the fixed mold, the top surfaces of the support plates are in contact with the fixed mold, and the outer sides of the support plates do not protrude from the recessed area; and Connecting plate, connects and fixes the two support plates.

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