Discharging door assembly of EVA (Ethylene Vinyl Acetate) internal mixer
By designing the unloading gate assembly, the problems of material adhesion and insufficient sealing during the unloading process of the EVA internal mixer were solved, realizing flexible control and smooth opening and closing of the unloading port, and improving unloading efficiency and equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU ZHI INNOVATION MATERIALS CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-05-19
AI Technical Summary
In existing EVA internal mixers, material tends to stick to the discharge gate during the unloading process, affecting the sealing effect. Furthermore, the opening and closing control of the discharge port is not flexible enough, resulting in uneven material flow.
A discharge gate assembly was designed, comprising a gate power unit, a retaining component, and a scraper structure. The gate power unit drives the discharge gate to flip, the retaining component inserts a retaining plate at an angle to prevent reverse flipping, and the scraper structure scrapes away impurities, ensuring smooth opening and closing and sealing of the discharge port.
It enables flexible control of the unloading gate, avoids material adhesion, ensures sealing, and improves unloading efficiency and equipment reliability.
Smart Images
Figure CN224255785U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of internal mixer technology, specifically to a discharge gate assembly for an EVA internal mixer. Background Technology
[0002] An EVA internal mixer, also known as an EVA rubber mixing machine, is a type of internal mixer mainly used for the plasticizing and mixing of materials such as EVA and rubber. An internal mixer is a machine with a pair of rotors of a specific shape that rotate relative to each other, which intermittently plasticizes and mixes raw materials in a closed state with adjustable temperature and pressure. Therefore, internal mixers are usually used for processing when manufacturing compound rubber.
[0003] In a typical internal mixer, when unloading, a discharge port is opened at the bottom. The material inside the discharge port falls from the mixing chamber due to its own weight and the agitation of the mixing shaft. It is then collected by a collection box placed at the bottom in advance. A set of sealing doors is usually installed at the discharge port to close the discharge port when the internal mixer is in use. Utility Model Content
[0004] In view of the prior art, the technical solution provided by this utility model is a discharge gate assembly for an EVA internal mixer, including a mixing chamber, wherein the mixing chamber includes a mixing room and a stirring mechanism is provided therein, and a discharge port is provided at the bottom of the mixing room; and a discharge gate, wherein the discharge gate includes a sealing member that matches and seals the discharge port, the sealing member is fixed on a support frame, and the support frame is hinged to the rotating shaft of a door power unit provided at the bottom of the mixing chamber;
[0005] The bottom of the support frame is provided with an arc rubber pad, and the mixing chamber is also provided with a retaining assembly. The retaining assembly is provided with a retaining plate that extends and retracts relative to the support frame and a cylinder that drives the retaining plate to extend and retract. The retaining plate is set directly opposite the arc rubber pad of the unloading door sealing part in the closed state, and is used to lock the opening direction of the sealing part.
[0006] As a further feature of the above scheme, it also includes a power compartment for the internal mixer, a gearbox, a universal joint shaft for power transmission between the gearbox and the mixing mechanism, and a feeding hopper at the upper end of the internal mixer compartment.
[0007] As a further feature of the above solution, the retaining component is provided with a relatively inclined discharge port opening, and the abutting surface of the retaining plate abutting the arc rubber pad is provided with an inclined driving surface.
[0008] As a further feature of the above solution, a shovel structure is provided above the retaining plate. The shovel structure includes a shovel plate and a top spring that pushes the shovel plate to extend toward the retaining plate.
[0009] As a further feature of the above solution, the end of the shovel plate that abuts against the retaining plate is provided with a shovel surface, and the shovel surface is set at an angle that matches the inclination angle of the retaining plate.
[0010] As a further feature of the above scheme, the door power unit and the cylinder are also equipped with sensors. The sensors are used for the sequential linkage control of the two, including the door power unit moving first when the unloading door is closed, and the cylinder moving after it stops. During unloading, the cylinder moves first to retract the retaining plate, and then the door power unit moves to flip the sealing component to open the unloading port.
[0011] Beneficial effects: The internal mixer of this utility model is equipped with a gate power unit to drive the discharge gate to rotate relative to the discharge port, thereby pushing the discharge gate with a sealing structure to open and close the discharge port. A retaining component is set to be inserted into the rotation stroke of the discharge gate, forming a retaining plate that is inserted into the opening stroke of the discharge gate when the discharge port is closed, so that the discharge gate cannot be rotated in reverse. This allows the gate power unit to be shut off after the retaining component is effective. Furthermore, a scraper structure is set to scrape impurities from the inclined surface of the retaining plate that abuts against the discharge gate while the discharge gate is opened. Based on the downward movement of the top spring, the movable groove of the retaining plate is blocked, preventing particles falling from the discharge port from entering or dust from accumulating, which would affect the normal operation and effectiveness of the retaining component. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the internal mixer structure of this utility model.
[0013] Figure 2 This is a cross-sectional structural diagram of the internal mixer unloading assembly in this embodiment.
[0014] Figure 3 This is a schematic diagram of the shovel structure in this embodiment.
[0015] Reference numerals in the attached diagram: 1. Internal mixing chamber; 11. Mixing chamber; 12. Stirring mechanism; 13. Discharge port; 2. Discharge door; 21. Sealing component; 22. Support frame; 23. Arc rubber pad; 24. Abutment surface; 3. Universal joint shaft; 4. Holding assembly; 41. Holding plate; 42. Cylinder component; 43. Inclined drive surface; 5. Shovel structure; 51. Shovel plate; 52. Top spring; 53. Shovel face; 6. Feeding bin; 7. Internal mixer power chamber; 8. Gearbox; 91. Shaft. Detailed Implementation
[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.
[0017] refer to Figure 1-3The present invention provides a discharge gate assembly for an EVA internal mixer. The internal mixer in this embodiment includes a power chamber 7, a reducer box 8, a universal joint shaft 3 for power transmission between the reducer box 8 and the stirring mechanism 12, a mixing chamber 1, and a feeding chamber 6 located at the upper end of the mixing chamber 1.
[0018] The mixing chamber 1 includes a mixing chamber 11, which is equipped with a stirring mechanism 12, and a discharge port 13 is provided at the bottom of the mixing chamber 11.
[0019] The unloading gate assembly in this embodiment includes the following:
[0020] Unloading gate 2, such as Figure 2 The discharge gate 2 shown includes a sealing member 21 that matches and seals the discharge port 13. The sealing member 21 is fixed on a support frame 22, which is hinged to the rotating shaft 91 of the door power unit located at the bottom of the mixing chamber 1. In this embodiment, when the discharge gate 2 is in use, by sending a command to the door power unit, the forward and reverse rotation of the rotating shaft 91 after the door power unit is started can control the discharge gate 2 to achieve a maximum rotation of 180°. It is worth noting that the rotation angle of the discharge gate 2 in the open state is the maximum value of 180° relative to the closed state. The purpose is to completely open the discharge port 13 and keep the sealing member 21 of the discharge gate 2 away from the bottom of the discharge port 13 to avoid blocking the material falling into the mixing chamber 11, and also to minimize the material adhering to the sealing member 21.
[0021] Furthermore, such as Figure 2 and Figure 3 The support frame 22 shown in this embodiment is provided with an arc rubber pad 23 at the bottom. A retaining component 4 is also provided in the mixing chamber 1. The retaining component 4 in this embodiment is provided with a retaining plate 41 that extends and retracts relative to the support frame 22 and a cylinder 42 that drives the retaining plate 41 to extend and retract. The retaining plate 41 is positioned directly opposite the arc rubber pad 23 of the unloading door sealing component 21 in the closed state, and is used to lock the opening direction of the sealing component 21.
[0022] As a further provision of the above scheme, the retaining component 4 is provided with an opening at a relatively inclined discharge port 13, and the retaining plate 41 has an inclined driving surface 43 on the abutting surface 24 provided on the abutting arc pad 23.
[0023] As a further provision of the above scheme, a shovel structure 5 is provided above the retaining plate 41. The shovel structure 5 includes a shovel plate 51 and a top spring 52 that pushes the shovel plate 51 toward the retaining plate 41. The end of the shovel plate 51 that abuts against the retaining plate 41 is provided with a shovel surface 53, and the shovel surface 53 is set to match the inclination angle of the retaining plate 41.
[0024] As a further provision of the above scheme, the door power unit and the cylinder 42 are also equipped with sensors. The sensors are used for the sequential linkage control of the two, including the door power unit acting first when the unloading door 2 is closed, and the cylinder 42 acting after it stops. During unloading, the cylinder 42 works first to retract the retaining plate 41, and then the door power unit works to flip the sealing part 21 to open the unloading port 13.
[0025] As described above, the unloading gate assembly in this embodiment has two main states during operation:
[0026] ① Closing the discharge port 13: The discharge gate 2 rotates and the sealing part 21 abuts against and seals the discharge port 13. The cylinder part 42 of the retaining assembly 4 drives the retaining plate 41 to extend. During the extension process, the inclined surface 43 of the retaining plate 41 abuts against and pushes the arc rubber pad 23, so that the arc rubber pad 23 receives the upward moving thrust, which provides a continuous sealing force to the discharge port 13, while the reaction force is applied to the retaining plate 41, such as... Figure 3 The reaction force shown is based on the pressure transmitted from the mixing chamber 11 to the unloading gate 2. It is a force that swings obliquely to the lower right. When this force is not consistent with the extension and retraction direction of the retaining plate 41 to the upper left, the retaining plate 41 will not have a problem of backward movement. In addition, the arc rubber pad 23 and the retaining plate 41 also have a certain frictional force, thereby achieving the continuous sealing and maintenance of the unloading gate 2 on the unloading port 13.
[0027] ② Opening the discharge port 13: The cylinder 42 of the retaining assembly 4 retracts the retaining plate 41 to the upper left space. The discharge door 2 swings open the discharge port 13 at the lower right hinge. Based on the door power unit, it swings further away from the area below the discharge port 13 to allow for smooth material discharge. During the retraction process, the front end of the shovel plate 51 of the shovel structure 5 located above it abuts against the retaining plate 41. When the retaining plate 41 moves to the upper left, the shovel surface 53, which abuts against the inclined driving surface 43, scrapes it against the surface of the inclined driving surface 43 based on the push of the top spring 52, reducing dust and materials falling on the inclined driving surface 43 and avoiding affecting its subsequent cooperation with the arc rubber pad 23. Furthermore, the falling shovel plate 51 also forms a closure of the accommodating space after the retaining plate 41 is retracted, preventing materials from being ejected into it and affecting the normal operation of the retaining assembly 4.
[0028] Furthermore, as described above, the unloading gate 2 and the retaining assembly 4 in this embodiment must have a sequential start-up order. Therefore, a switch sensor, such as a tactile switch or a contact sensor, can be further installed. In use, as described above, when the unloading port 13 needs to be closed, the unloading gate 2 operates first. After the operation is completed, the retaining assembly 4 operates next. After the retaining assembly 4 has finished operating, the door power unit of the unloading gate 2 can stop being powered, reducing energy consumption. Conversely, when opening the door, the retaining assembly 4 needs to retract first. After retracting, the door power unit starts to reverse the unloading gate 2 to the outside. It is worth noting that the door power unit can also be powered during opening to maintain the continuous seal of the unloading gate 2 until the retaining assembly 4 retracts and triggers the command, at which point the door power unit starts to rotate. This design can prevent the unloading gate 2 from getting stuck or the retaining plate 41 from being damaged when it is not retracted.
[0029] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.
Claims
1. A discharge gate assembly for an EVA internal mixer, characterized in that, include: The mixing chamber (1) includes a mixing room (11) with a stirring mechanism (12) inside, and a discharge port (13) is provided at the bottom of the mixing room (11). The unloading gate (2) includes a sealing member (21) that matches and seals the unloading port (13). The sealing member (21) is fixed on the support frame (22), which is hinged to the shaft (91) of the door power unit at the bottom of the mixing chamber (1). The support frame (22) is provided with an arc rubber pad (23) at the bottom, and the mixing chamber (1) is also provided with a retaining component (4). The retaining component (4) is provided with a retaining plate (41) that extends and retracts relative to the support frame (22) and a cylinder (42) that drives the retaining plate (41) to extend and retract. The retaining plate (41) is set directly opposite the arc rubber pad (23) of the unloading door sealing component (21) in the closed state, and is used to lock the opening direction of the sealing component (21). Above the retaining plate (41) is a shovel structure (5), which includes a shovel plate (51) and a top spring (52) that pushes the shovel plate (51) toward the retaining plate (41). The end of the shovel plate (51) that abuts against the retaining plate (41) is provided with a shovel surface (53), and the shovel surface (53) is set to match the inclination angle of the retaining plate (41).
2. The discharge gate assembly of an EVA internal mixer according to claim 1, characterized in that: It also includes a power chamber (7) for the internal mixer, a gearbox (8), and a universal joint shaft (3) for power transmission between the gearbox (8) and the stirring mechanism (12). The upper end of the internal mixer (1) is also provided with a feeding hopper (6).
3. The discharge gate assembly of an EVA internal mixer according to claim 1, characterized in that: The retaining assembly (4) is inclined to the discharge port (13) and the retaining plate (41) has an inclined driving surface (43) on the contact surface (24) provided on the contact surface (23) of the contacting arc pad (23).
4. The discharge gate assembly of an EVA internal mixer according to claim 1, characterized in that: The door power unit and the cylinder (42) are also equipped with sensors. The sensors are used for the sequential linkage control of the two. When the unloading door (2) is closed, the door power unit moves first and the cylinder (42) moves after it stops. When unloading, the cylinder (42) works first to retract the retaining plate (41) and then the door power unit works to flip the sealing part (21) to open the unloading port (13).