A rubber compound extruder head locking device, extruder head and method

Abstract

The application provides a rubber composite extruder head locking device, an extruder head and a method, and belongs to the field of extrusion equipment.The rubber composite extruder head locking device comprises a lock door, a connecting seat, a connecting plate and a moving unit;the lock door is provided with a through hole, the connecting seat is arranged in the through hole, and the moving unit is installed in the inner cavity of the connecting seat;the connecting plate is located outside the lock door, and the two ends of the connecting plate are connected with the lock door, and the moving unit is connected with the connecting plate;the moving unit drives the lock door to move back and forth through the connecting plate.The locking structure is simple, the processing and assembly are good, and the mold body locking efficiency is improved.The locking device is symmetrically installed on the two sides of the extruder head, space for connecting the head with the extruder is left in the rear part of the head, special extrusion devices can be configured, and the adaptability is strong.

Description

Technical Field

[0001] The invention belongs to the technical field of extrusion equipment, and in particular relates to a rubber composite extruder head locking device, an extruder head and a method. Background Art

[0002] Extrusion heads are primarily used to provide a shaped outlet for producing extruded profiles in the rubber and plastics industry. Extrusion heads for the continuous production of one or more extruded profiles from one or more extruders consist of a stationary die and at least one movable element (also known as a movable die) mounted on a clamping pivot. The movable element is moved relative to the stationary die by the clamping pivot so that they seal against adjacent surfaces in their working position and can be swung into an open position from which the operator can perform cleaning and maintenance.

[0003] For example, Figure 1 、 Figure 2 In the illustrated embodiment, one or more extruders 1 are mounted on a fixed die body 3 of an extruder head, and the extruder head includes at least one movable die body 6 arranged on a pivot 7, and the movable die body 6 can be rotated based on the pivot 7 so that the movable die body 6 and the fixed die body 3 form a mutually adjacent sealing surface in the working position, and the movable die body 6 can be swung and rotated to an open position.

[0004] A typical extrusion profile production system consists of at least one extruder connected to an extrusion head. These devices process the input material, heating it and generating pressure to plasticize it. The material is then extruded through flow channels within the extrusion head into the desired shape of the extruded profile, determined by the shape of the output section of the extruder head. Extrusion heads are typically designed to be openable to facilitate cleaning and maintenance of the flow channels. However, when the extruder head is closed, i.e., in the operating position, it must be sealed and withstand the pressure of the plasticized material, necessitating a locking device.

[0005] However, the existing locking device on the extruder head is bulky and complex in structure, and a large number of parts are arranged on the back of the extruder, which makes installation and maintenance inconvenient. In addition, it uses a cylinder for direct locking and cannot achieve mechanical self-locking, so it has high requirements for the hydraulic system. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a rubber composite extruder head locking device, an extruder head and a method, which have a simple structure and good processing and assembly performance. It not only improves the locking efficiency of the mold body, but also frees up space at the rear of the head for connecting the head with the extruder. It can also be equipped with a special extrusion device to expand its adaptability.

[0007] The present invention is achieved through the following technical solutions:

[0008] A first aspect of the present invention provides a rubber composite extruder head locking device, the rubber composite extruder head locking device comprising a locking door, a connecting seat, a connecting plate and a moving unit;

[0009] A through hole is opened on the lock door, the connecting seat is arranged in the through hole, and the moving unit is installed in the inner cavity of the connecting seat;

[0010] The connecting plate is located outside the locking door, and both ends are connected to the locking door respectively, and the moving unit is connected to the connecting plate;

[0011] The moving unit drives the locking door to move back and forth through the connecting plate.

[0012] A further improvement of the present invention is that the lock door is a C-shaped structure, which includes an upper protrusion, a body and a lower protrusion connected in sequence into one body;

[0013] The main body is a rectangular parallelepiped structure, and a through hole is opened in the middle of the main body;

[0014] The upper convex block and the lower convex block are respectively located at the upper and lower ends of the through hole and are located on the same side surface of the body.

[0015] A further improvement of the present invention is that an upper wedge-shaped inclined surface is provided at the connection between the lower portion of the upper protrusion and the body;

[0016] A lower wedge-shaped inclined surface is provided at the connection between the upper portion of the lower protrusion and the body;

[0017] The angles of the upper wedge-shaped inclined surface and the lower wedge-shaped inclined surface are both 3°-12°.

[0018] A further improvement of the present invention is that the connecting plate is a plate-shaped structure, which is parallel to the side of the lock door, and its upper end is located above the through hole of the lock door and connected to the lock door, and its lower end is located below the through hole of the lock door and connected to the lock door;

[0019] The connecting plate and the upper protrusion are respectively located on both sides of the locking door.

[0020] A further improvement of the present invention is that the connecting seat is a rectangular ring structure with one side open;

[0021] The connecting seat is located in the through hole of the lock door, and its upper, lower, left and right outer surfaces are respectively in contact with the inner wall of the through hole of the lock door;

[0022] The locking door can move back and forth along the upper, lower, left and right outer surfaces of the connecting seat.

[0023] The mobile unit comprises a piston rod and a power mechanism.

[0024] One end of the piston rod is connected with the power mechanism, and the other end is connected with the middle part of the connecting plate.

[0025] The power mechanism is installed in the inner cavity of the connecting seat.

[0026] The power mechanism adopts a hydraulic cylinder, a gas cylinder or an electric driving mechanism.

[0027] The second aspect of the present application provides a rubber composite extruder head, which comprises a fixed die body and a movable die body.

[0028] The rubber composite extruder head locking device is installed on the left and right sides of the fixed die body.

[0029] The unopened side of the connecting seat of one locking device is connected with the side of the fixed die body.

[0030] The unopened side of the connecting seat of the other locking device is connected with the other side of the fixed die body.

[0031] When the piston rod is extended to the longest, the upper and lower wedge-shaped slopes of the lock door are not in contact with the upper and lower locking surfaces of the movable die body, respectively; when the piston rod is retracted, the upper and lower wedge-shaped slopes of the lock door are in complete contact with the upper and lower locking surfaces of the movable die body, respectively, to generate a locking force to realize locking.

[0032] The third aspect of the present application provides a rubber composite extruder head locking method, which comprises the following steps:

[0033] When the extruder head needs to be locked, the mobile unit in the locking device on the left and right sides of the extruder head is used to pull the lock door in the locking device on the left and right sides to move synchronously inward, so that the upper and lower wedge-shaped slopes of each lock door are in contact with the upper and lower locking surfaces of the outermost movable die body, respectively, so that each movable die body is locked.

[0034] When the extruder head needs to be opened, the mobile unit in the locking device on the left and right sides of the extruder head is used to pull the lock door in the locking device on the left and right sides to move synchronously outward, so that the upper and lower wedge-shaped slopes of each lock door are away from the upper and lower locking surfaces of the outermost movable die body, respectively, until the upper and lower wedge-shaped slopes are no longer in contact with the upper and lower locking surfaces, so that each movable die body is no longer locked.

[0035] The method further comprises the following steps:

[0036] The length of all flow channels on the extruder head is shortened by 10%-20%.

[0037] Further improvement of the present application is that the method further comprises setting the installation angle of the thrust plate on the extruder head to 40-55 degrees.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] The locking structure of the present application is simple, easy to process and assemble, and improves the locking efficiency of the mold body. The locking device is symmetrically installed on the two sides of the extruder head, freeing up space for the connection of the head and the extruder at the rear of the head, which can be configured with special extrusion devices (such as rubber gear pump extrusion devices, etc.), expanding the adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 Structure schematic diagram of the rubber composite extruder head in working state;

[0041] Figure 2 Structure schematic diagram of the rubber composite extruder head after opening;

[0042] Figure 3 Sectional view schematic diagram of the door lock of the rubber composite extruder head locking device in working state;

[0043] Figure 4 Sectional view schematic diagram of the door lock of the rubber composite extruder head locking device in mold opening state;

[0044] Figure 5 Side sectional view schematic diagram of the door lock in the rubber composite extruder head locking device;

[0045] Figure 6 Structure schematic diagram of the door lock in the rubber composite extruder head locking device;

[0046] Figure 7 Structure schematic diagram of the connecting seat in the rubber composite extruder head locking device;

[0047] Figure 8 Installation angle schematic diagram of the thrust plate on the rubber composite extruder head.

[0048] 1, extruder; 2, door lock; 3, fixed mold body; 4, head flow channel; 5, thrust plate; 6, movable mold body; 7, pivot; 8, connecting plate; 9, connecting seat; 10, moving unit; 11, wedge-shaped inclined surface; 12, locking surface. DETAILED DESCRIPTION

[0049] The present application will be further described in detail below in conjunction with the drawings:

[0050] As Figure 1 and Figure 2As shown, the existing extruder head is based on the middle arrangement of the fixed die body 3, and a plurality of movable die bodies 6 are arranged above and below the fixed die body 3. The upper and lower back portions of the fixed die body 3 are respectively provided with upper and lower pivots 7 for providing a turning reference for the movable die bodies 6, and each movable die body 6 can be rotated to open and close along the pivot 7, thereby facilitating manual maintenance of the flow channel cavity of the movable die body 6 or cleaning of the material in the flow channel cavity. A plurality of extruders 1 are arranged on the rear surface of the fixed die body 3, and materials of different formulations are forcedly fed into the flow channel cavities of each movable die body 6 and the fixed die body 3 by the extruders. The fixed die body 3 is arranged in the middle of each movable die body 6. In addition, a thrust plate is also installed on the existing extruder head.

[0051] To ensure the locking closing force of the extruder head under the composite profiling working condition, the rubber composite extruder head locking device of the application is symmetrically installed on the left and right sides of the fixed die body 3 and connected with the left and right sides of the fixed die body 3 of the rubber composite extruder head, and is symmetrically arranged. Since the locking device is arranged on the two sides of the extruder head, the space of the back of the extruder head (i.e. the installation side of the extruder) is open, which can facilitate the arrangement of various additional components and the maintenance and installation.

[0052] As shown in the drawings, Figures 3 to 5 The rubber composite extruder head locking device of the application comprises a lock door 2, a connecting seat 9, a connecting plate 8 and a moving unit 10. A through hole is formed in the lock door 2, the connecting seat 9 is arranged in the through hole, the moving unit 10 is installed in the inner cavity of the connecting seat 9, the connecting plate is located outside the lock door and connected with the lock door at both ends, and the moving unit is connected with the connecting plate. The moving unit can drive the lock door to reciprocate along the outer wall of the connecting seat through the connecting plate.

[0053] When installed, one side of the connecting seat of one locking device is connected with one side of the fixed die body of the extruder head, and one side of the connecting seat of the other locking device is connected with the other side of the fixed die body of the extruder head.

[0054] Specifically, as shown in the drawings, Figure 6 The lock door 2 is a C-shaped structure and comprises an upper protruding block, a body and a lower protruding block which are sequentially connected into one body. The body is a cuboid structure, a through hole is formed in the middle of the body, and the upper and lower protruding blocks are located at the upper and lower ends of the through hole and on the same side of the body. In this way, the entire lock door 2 has light weight, compact space, fewer components and simple structure, and higher reliability. Preferably, the through hole is a rectangular hole.

[0055] Preferably, an upper wedge-shaped inclined surface 11 is arranged at the lower part of the upper protruding block and the body, and a lower wedge-shaped inclined surface is also arranged at the upper part of the lower protruding block and the body.Figure 6 As shown, from the longitudinal section of the lock door, the shapes of the upper and lower protrusions are both right-angled trapezoids, and the lower base of the upper protrusion is fixedly connected to the upper end side of the body, the right-angled waist of the upper protrusion and the top edge of the body are located on the same straight line, and the oblique waist of the upper protrusion forms an upper wedge-shaped inclined surface 11, the lower base of the lower protrusion is fixedly connected to the lower end side of the body, the right-angled waist of the lower protrusion and the bottom edge of the body are located on the same straight line, and the oblique waist of the lower protrusion forms a lower wedge-shaped inclined surface.

[0056] Preferably, the angles of the upper and lower wedge-shaped slopes are both 3°-12° (this angle is calculated based on the friction coefficient of the contact surface; if the tangent function of the angle is less than the friction coefficient, mechanical self-locking can be achieved). In the YZ plane, this angle enables the lock door 2 to achieve mechanical self-locking in the event of hydraulic or electrical failure. Even if the hydraulic system loses power, the machine head can still ensure sealing and safety.

[0057] Preferably, the upper and lower ends of the other side of the main body that are not connected to the upper and lower protrusions are rounded respectively. On the one hand, this meets the requirements of the casting process, and the stress at this position is small, so not much material is required. On the other hand, it avoids sharp corners that may injure people.

[0058] The connecting plate 8 is a plate-like structure that is arranged parallel to the side of the lock door and connected to the side of the body opposite to the side where the upper and lower protrusions are installed. That is, the connecting plate and the upper and lower protrusions are respectively located on both sides of the lock door. Specifically, the upper end of the connecting plate is located above the through hole of the lock door and connected to the lock door, and the lower end of the connecting plate is located below the through hole of the lock door and connected to the lock door. The connecting plate and the lock door 2 can be connected by bolts. In this way, when the connecting plate reciprocates, the lock door 2 can be driven to reciprocate through its upper and lower ends.

[0059] like Figure 7 As shown, the connecting seat 9 is an overall C-shaped rectangle, i.e., a rectangular ring-shaped structure with one side open. The connecting seat 9 is located within the through-hole of the lock door 2, and its upper, lower, left, and right outer surfaces respectively contact the inner wall of the through-hole of the lock door. The outer surfaces of the upper and lower sides of the connecting seat 9 are parallelogram-shaped, while the outer surfaces of the left and right sides are C-shaped. The lock door 2 is guided by four planes, ensuring that the lock door 2 moves within the constraints of the XY and YZ axis planes. In addition, the inner surface of the through-hole of the lock door 2 contacts the outer plane of the connecting seat 9 to limit the guidance, ensuring that the wedge-shaped inclined surface can move the locking head along the Y axis.

[0060] Furthermore, in order to ensure smooth relative movement between the inner wall of the through hole of the lock door and the outer wall of the connecting seat 9, a self-lubricating block can be provided between the contact surfaces of the two.

[0061] During installation, the outer surface of the unopened side of the connecting seat 9 is fixedly connected to the side of the fixed mold body 3. The fixed connection method can adopt various existing connection methods, such as bolt and stopper matching connection.

[0062] The mobile unit 10 installed in the inner cavity of the connecting seat 9 can be configured with a hydraulic or electric drive mechanism to realize the movement of the lock door 2, and the power transmission of the mobile unit can be realized by introducing a pipeline from the outside through the opening of the connecting seat 9.

[0063] Specifically, the moving unit 10 includes a piston rod and a power mechanism. One end of the piston rod is connected to the power mechanism, and the other end is connected to the middle of the connecting plate 8. The power mechanism drives the piston rod to extend or retract, thereby driving the connecting plate 8 to move away from or toward the connecting seat 9. The connecting plate 8 simultaneously drives the lock door 2 away from the extruder head or into the extruder head. The power mechanism is installed in the cavity of the connecting seat 9. The power mechanism can adopt an existing hydraulic cylinder, pneumatic cylinder, or electric drive mechanism, as long as it can drive the piston rod to move back and forth. Figure 3 、 Figure 4 、 Figure 5 In the illustrated embodiment, the moving unit 10 is implemented as a hydraulic cylinder.

[0064] When the piston rod is extended to its longest position, the distance between the connecting plate and the connecting seat is the largest. At this time, the upper and lower wedge-shaped inclined surfaces of the lock door do not contact the upper and lower locking surfaces 12 on the movable mold body 6. When the piston rod is retracted, the distance between the connecting plate and the connecting seat is close. At this time, the upper and lower wedge-shaped inclined surfaces of the lock door are in full contact with the upper and lower locking surfaces 12 on the movable mold body 6, generating a locking force to achieve locking.

[0065] Preferably, the connection base 9 has a fluid medium or solid heat insulation function, which can be achieved by drilling a hole in the connection base 9 and passing cooling water or installing a heat insulation material. The heat insulation function can control the operating temperature of the mobile unit 10, ensuring the stability and reliability of the long-term operation of the mobile unit 10.

[0066] The lock door 2 is connected to the mobile unit 10 via the connecting plate 8 ( Figure 5 The embodiment shown is a structure without the connecting plate 8 , and the moving unit 10 pulls the locking door 2 to move along the outer surface of the connecting seat 9 , and finally locks the machine head through the wedge-shaped inclined surface 11 .

[0067] The inner surface of the through hole in the lock door 2 and the outer surface of the connecting seat 9 are in contact to form the XY and YZ axis surface constraints, which ensure that the moving units 10 symmetrically arranged on both sides of the fixed die body 3 drive the lock door 2 to move synchronously inward along the Y axis on the connecting seat 9 to lock the extruder head. The synchronous inward locking of the lock door is ensured by the power mechanism, for example, if the power mechanism adopts a hydraulic cylinder, the valve flow is controlled to synchronize the inward locking of the lock doors on both sides, if the power mechanism adopts an electric drive mechanism, the motor speed is synchronized to control the inward locking of the lock doors on both sides, and the synchronous control method can be realized by using the existing method, which will not be described here.

[0068] During operation, the moving unit 10 pulls the lock door 2 to move on the connecting seat 9, the lock door 2 moves synchronously inward from both sides, finally locks the movable die body 6 through the wedge-shaped slope 11, and realizes mechanical self-locking through the wedge-shaped slope 11, and uses the closing force generated by the wedge-shaped slope 11 to resist the pressure of the rubber material to achieve the effect of abutting surface sealing.

[0069] The present application also provides an extruder head locking method, which comprises: symmetrically arranging the above-mentioned locking device on the left and right sides of the fixed die body 3, and pulling the lock doors in the locking devices on both sides synchronously inward by the moving unit 10 through hydraulic or electric measures, so that the upper and lower wedge-shaped slopes of each side of the lock door are in contact with the upper and lower locking surfaces 12 of the outermost movable die body 6 respectively, and the closing force generated by the contact between the wedge-shaped slope 11 and the locking surface 12 makes each movable die body 6 be locked. When it is needed to switch the extruder head to the open position, the device operation is carried out in the order opposite to the above-mentioned movement, that is, the moving unit 10 is controlled to pull the lock doors in the locking devices on both sides synchronously outward through hydraulic or electric measures, so that the upper and lower wedge-shaped slopes of each side of the lock door are away from the upper and lower locking surfaces 12 of the outermost movable die body 6 respectively, until the upper and lower wedge-shaped slopes are no longer in contact with the upper and lower locking surfaces 12, at this time, the extruder head is no longer locked, and the lock door and the movable die body reach a certain distance, and each movable die body can be opened.

[0070] For the existing extruder head, the locking device of the present application can realize locking. However, since the length of the flow channel 4 of the existing extruder head is relatively long, the locking mechanical parameter requirement of the locking device is relatively high, therefore, preferably, the method can further comprise:

[0071] Based on the comprehensive consideration of ensuring the bonding strength between the molten composite layers and the material extrusion temperature, the load of the fixed die body 3 can be reconfigured from the stress balance result, that is, the length of all the flow channels 4 is shortened to reduce the load, preferably, the length of the flow channel 4 is shortened by 10%-20%. Shortening the length of the flow channel 4 not only reduces the load of the component, but also reduces the residence time of the rubber, reduces the pressure and rubber temperature, and improves the yield. Moreover, after shortening the length of all the flow channels 4, the locking force mechanical parameter requirement of the locking device is also reduced, and then the size of the locking device can be reduced.

[0072] In addition, from the stress analysis of the extruder head, the pressure applied by the lock door 2 and the pressure applied by the thrust plate 5 need to be balanced with the screw axial rubber thrust, the flow channel surface rubber thrust and the die surface rubber thrust, therefore, preferably, the method can further comprise:

[0073] By increasing the installation angle of the thrust plate 5 on the existing extruder head, the stress of the lock door under the same load condition can be reduced. The thrust plate 5 is installed on the fixed die body 3, and increasing the installation angle of the thrust plate can reduce the power demand, but too large installation angle will cause the movable die body to be unable to open, therefore, considering both conditions, a suitable installation angle is selected, and the installation angle of the thrust plate in the present application is preferably 40°-55°. The change of the installation angle of the thrust plate can be realized by using the existing method of adjusting the size of the support position of the thrust plate, which will not be described here again, such as Figure 8 As shown in the figure, the stress of the lock door is reduced by adjusting the installation angle a of the thrust plate.

[0074] After adjusting the installation angle of the thrust plate 5, the stress of the fixed die body 3 and the lock door 2 is redistributed, so that the stress of the lock door 2 is more uniform, and the stress of the lock door is greatly reduced, so that the size of the locking device is smaller and more lightweight. Moreover, after reducing the pressure demand of the lock door, the side lock door has lower requirements for the power system (such as hydraulic system), the stress of the die body is smaller, and the locking is more reliable.

[0075] In summary, by shortening the flow channel and increasing the installation angle of the thrust plate, the present application reduces the balance force required for locking the extruder head, thereby reducing the size requirement of the moving unit 10 and the rated power of the moving unit 10, while having the advantage of smaller assembly area, reducing the operation area required by the locking device of the extruder head. The present application reduces the investment cost and the operation requirement and energy consumption of operation under the condition of smaller equipment size.

[0076] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0077] 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.

[0078] Finally, it should be noted that the above technical solution is only one embodiment of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the application methods and principles disclosed in the present invention, and it is not limited to the method described in the above specific embodiment of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.

Claims

1. A rubber composite extruder head, characterized by: The rubber composite extruder head includes a fixed die body, a movable die body, and a rubber composite extruder head locking device installed on both sides of the fixed die body; the locking device is connected to the left and right sides of the fixed die body of the rubber composite extruder head and is symmetrically arranged; The rubber composite extruder head locking device includes a locking door, a connecting seat, a connecting plate and a moving unit; A through hole is opened on the lock door, the connecting seat is arranged in the through hole, and the moving unit is installed in the inner cavity of the connecting seat; The connecting plate is located outside the locking door, and both ends are connected to the locking door respectively, and the moving unit is connected to the connecting plate; The moving unit drives the lock door to move back and forth through the connecting plate; Wherein, the unopened side of the connecting seat of a locking device is connected to the side surface of the fixed mold body; The unopened side of the connecting seat of the other locking device is connected to the other side surface of the fixed mold body; When the piston rod is extended to its longest position, the upper wedge-shaped inclined surface and the lower wedge-shaped inclined surface of the lock door are not in contact with the upper and lower locking surfaces of the movable mold body respectively; when the piston rod is retracted, the upper wedge-shaped inclined surface and the lower wedge-shaped inclined surface of the lock door are in full contact with the upper and lower locking surfaces of the movable mold body respectively, generating a locking force to achieve locking.

2. The rubber composite extruder head according to claim 1, characterized in that: The lock door is a C-shaped structure, which includes an upper protrusion, a body and a lower protrusion connected in sequence; The main body is a rectangular parallelepiped structure, and a through hole is opened in the middle of the main body; The upper convex block and the lower convex block are respectively located at the upper and lower ends of the through hole and are located on the same side surface of the body.

3. The rubber composite extruder head according to claim 2, characterized in that: An upper wedge-shaped inclined surface is provided at the connection between the lower portion of the upper protrusion and the body; A lower wedge-shaped inclined surface is provided at the connection between the upper portion of the lower protrusion and the body; The angles of the upper wedge-shaped inclined surface and the lower wedge-shaped inclined surface are both 3°-12°.

4. The rubber composite extruder head according to claim 3, characterized in that: The connecting plate is a plate-shaped structure, which is parallel to the side of the lock door, and its upper end is located above the through hole of the lock door and connected to the lock door, and its lower end is located below the through hole of the lock door and connected to the lock door; The connecting plate and the upper protrusion are respectively located on both sides of the locking door.

5. The rubber composite extruder head according to claim 4, characterized in that: The connecting seat is a rectangular ring structure with one side open; The connecting seat is located in the through hole of the lock door, and its upper, lower, left and right outer surfaces are respectively in contact with the inner wall of the through hole of the lock door; The locking door can move back and forth along the upper, lower, left and right outer surfaces of the connecting seat.

6. The rubber composite extruder head according to claim 1, characterized in that: The moving unit includes a piston rod and a power mechanism; One end of the piston rod is connected to the power mechanism, and the other end is connected to the middle part of the connecting plate; The power mechanism is installed in the inner cavity of the connecting seat; The power mechanism adopts a hydraulic cylinder, a pneumatic cylinder or an electric drive mechanism.

7. A method for locking a rubber composite extruder head according to any one of claims 1 to 6, characterized in that: The method comprises: symmetrically arranging the locking devices on the left and right sides of the fixed die body of the extruder head; When the extruder head needs to be locked, the moving units in the locking devices on both sides are used to pull the locking doors in the locking devices on both sides to move inward synchronously, so that the upper wedge-shaped inclined surface and the lower wedge-shaped inclined surface of the locking door on each side are respectively in contact with the upper and lower locking surfaces of the outermost movable die, so that each movable die is locked; When the extruder head needs to be opened, the moving units in the locking devices on both sides are used to pull the locking doors in the locking devices on both sides to move outward synchronously, so that the upper wedge-shaped inclined surface and the lower wedge-shaped inclined surface of the locking door on each side are respectively away from the upper and lower locking surfaces of the outermost movable mold body, until the upper wedge-shaped inclined surface and the lower wedge-shaped inclined surface are no longer in contact with the upper and lower locking surfaces, so that each movable mold body is no longer locked.

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