Automatic protection device for an extruder

Abstract

The utility model relates to extruder parts, a kind of extruder automatic protection device, extruder includes mounting block, and mounting block is located on the open operation area of extruder and close to the crushing opening of extruder, the extruder automatic protection device is installed on extruder, it include: framework, fixedly installed on the open operation area of extruder, located above the crushing opening of extruder, for surrounding the crushing opening;Transparent protective cover is fixedly connected with framework, and covers framework, and is used to closedly surround crushing opening;Cylinder is installed in one side of framework, one end is hinged with mounting block, the other end is hinged with framework, for driving framework to unfold or close.The utility model can simultaneously improve "safety protection+environmental management+production synergy" to achieve triple technical effect.

Description

Technical Field

[0001] This utility model relates to extruder components, and in particular to an automatic protection device for an extruder. Background Technology

[0002] Currently, in industrial sectors such as aluminum profile processing and recycled metal processing, assembly workshops widely use large-scale extrusion crushers, such as 500-ton units, to crush and process waste raw materials, cooked materials, and waste paste, thereby enabling resource reuse. This type of equipment plays a significant role in improving production efficiency and reducing energy consumption.

[0003] However, the lack of safety measures in the open operating area of ​​existing large-scale extrusion crushers has become one of the key issues restricting their safe operation. Since this area is frequently used by feeding and maintenance personnel, the lack of necessary physical isolation and protective facilities poses a high safety hazard. Specifically, the current equipment has two main core safety defects: First, during the extrusion process, materials may not be effectively crushed, leading to blockages, or the high power may cause slow extrusion speeds, thus extending equipment operating time and increasing operation frequency. Therefore, an open operating area is set up to facilitate inspection and maintenance by maintenance personnel. However, during equipment operation, operators and maintenance personnel must perform feeding or inspection work above the open operating area without any protective measures, posing a risk of falling from height into the extruder. Second, dust pollution is severe: because the extrusion area is open-air, dust generated during the extrusion process (such as carbon powder, asphalt fumes, etc.) cannot be effectively collected, resulting in excessive dust concentrations in the workshop, endangering employee health. Furthermore, dust accumulation may cause electrical equipment malfunctions. Therefore, large-scale extrusion crushers still have significant deficiencies in structural design and safety protection. Utility Model Content

[0004] To simultaneously improve the triple technical effects of "safety protection + environmental management + production coordination", this basic solution provides an automatic protection device for extruders.

[0005] An automatic protection device for an extruder is disclosed. The extruder includes a mounting block located in the open working area of ​​the extruder and close to the crushing opening. The automatic protection device is installed on the extruder and includes: a frame fixedly installed in the open working area of ​​the extruder, located above the crushing opening, for surrounding the crushing opening; a transparent protective cover fixedly connected to the frame and covering the frame, for providing a closed enclosure of the crushing opening; and a cylinder installed on one side of the frame, one end hinged to the mounting block and the other end hinged to the frame, for driving the frame to open or close.

[0006] Beneficial effects: First, it achieves a safety protection effect. Firstly, it prevents personnel from falling. By installing a frame and transparent protective cover in the open working area of ​​the extruder, the crushing opening is completely enclosed, effectively preventing operators or maintenance personnel from accidentally falling into the extruder during feeding, inspection, and other operations, thus eliminating the safety hazard of falls from heights. Secondly, it prevents mechanical injuries. The enclosed design of the transparent protective cover isolates the crushing area of ​​the extruder from the outside environment, preventing personnel from coming into contact with high-speed moving mechanical parts during equipment operation, thereby reducing the risk of personnel injury caused by mechanical movement.

[0007] Secondly, it achieves effective workshop environmental management. Firstly, dust is effectively controlled. The transparent protective cover seals the crushing opening, confining dust generated during the extrusion process (such as carbon powder and asphalt fumes) within the opening and preventing it from spreading into the workshop environment. Combined with the existing dust collection system, it effectively collects dust, reduces dust concentration in the workshop, improves the working environment, and reduces the health hazards of dust to employees. Secondly, it reduces dust collection energy consumption. Because dust is effectively confined within the crushing opening, the efficiency of the dust collection system is significantly improved, thereby reducing its energy consumption.

[0008] Simultaneously, it achieved production synergy. First, it improved production efficiency. By using cylinders to drive the expansion and closure of the frame, it achieved automated control of the protective device, reducing the tediousness of manual operation. Second, it reduced human intervention. The automated design of the protective device reduced the need for manual operation of the protective facilities, lowered the labor intensity of operators, and also avoided safety risks caused by improper manual operation, further improving production synergy and stability.

[0009] Finally, by reducing accident risks through physical isolation and automated control, the risk of personnel falling into the extruder and mechanical injuries is fundamentally eliminated, significantly reducing the incidence of workshop safety accidents. Simultaneously, equipment stability is improved; the installation of protective devices does not affect the normal operation of the extruder. Instead, by reducing dust accumulation and preventing material spillage, it extends the equipment's lifespan and reduces maintenance costs.

[0010] Preferably, the skeleton comprises a multi-layer frame, with flexible connecting strips fixedly connected between each layer of the frame; the area enclosed by each frame decreases sequentially from bottom to top.

[0011] Beneficial effects: The frame adopts a multi-layered frame structure, with each layer connected by flexible connecting strips, and the area enclosed by the multiple layers decreasing from bottom to top. This design allows the frame to move more flexibly when unfolding and closing, and the flexible connecting strips between the layers provide a certain degree of flexibility, ensuring that the frame is not easily damaged during movement. At the same time, the reduced area design can better adapt to the shape of the crushing opening of the extruder, allowing the frame to more tightly surround the crushing opening, thereby improving the protective effect and reliability of the protective device.

[0012] Preferably, the frame comprises a bottom frame, a middle frame, and a top frame from bottom to top; a fixing block is fixedly installed on the open working area of ​​the extruder, the fixing block being close to the frame; the fixing block is provided with multiple pivot points, each pivot point corresponding to the bottom frame and the middle frame respectively, and the fixing block is pivotally connected to the bottom frame and the middle frame respectively through the pivot points; the fixing block is also provided with a first fixing point, the first fixing point corresponding to the top frame, and the fixing block is fixedly connected to the top frame through the first fixing point.

[0013] Beneficial effects: By setting fixed blocks and multiple pivot points and a first fixing point on the fixed blocks, which are connected to the bottom frame, middle frame, and top frame respectively, this connection method can provide stable support and reliable connection for the skeleton, ensuring that the relative positions and movement relationships between the frames are accurate during the expansion and closure of the skeleton. This enhances the structural stability of the entire protective device and avoids affecting the protective effect due to loosening or misalignment between frames.

[0014] Preferably, the flexible connecting strip is provided with a plurality of second fixing points, each of which corresponds to a layer of frame, and the flexible connecting strip is fixedly connected to each layer of frame through the second fixing points.

[0015] Beneficial effects: The flexible connecting strip has multiple second fixing points, each corresponding to a frame layer, and is fixedly connected to each frame layer through these second fixing points. This further strengthens the connection between the flexible connecting strip and each frame layer, enabling the flexible connecting strip to better bear the connection and motion transmission functions between the frames, improving the overall structural strength and stability of the skeleton, and also helping to ensure the stability and consistency of the skeleton during movement.

[0016] Preferably, the skeleton is hinged to the bottom frame.

[0017] Beneficial effects: The frame is hinged to the bottom frame, which makes the frame's movement more flexible, enabling rapid expansion and contraction. During the extrusion press's operation, the frame can quickly respond to the cylinder's drive, expanding or retracting in a timely manner, thus better adapting to the extrusion press's production rhythm, improving production efficiency, and ensuring the reliability and stability of the protective device throughout the entire working process.

[0018] Preferably, the transparent protective cover is also provided with an observation opening, and the distance between the observation opening and the breakage opening is not higher than 500mm.

[0019] Beneficial effects: The transparent protective cover has an observation opening, and the distance between the observation opening and the crushing opening is no more than 500mm. This design not only meets the needs of workers to observe the inside of the crushing opening at close range when needed, facilitating the timely detection and handling of potential problems, but also effectively prevents personnel from being in danger due to excessive proximity. It balances the convenience and safety of operation, further improving the practicality and protective effect of the protective device.

[0020] Preferably, the stroke of the cylinder is no more than 1500 mm.

[0021] Beneficial effects: Limiting the cylinder stroke to no more than 1500mm effectively controls the range of motion of the frame, preventing collisions and damages caused by excessive stroke during the opening or closing of the frame. It also helps ensure that the frame can accurately reach the predetermined position, ensuring that the protective function of the protective device can be properly performed, improving the reliability and stability of the protective device, and reducing the risk of equipment failure.

[0022] Preferably, a limit switch is fixedly installed on the edge of the frame; the limit switch is used to limit the maximum stroke of the cylinder to ensure that the frame can just cover the crushing opening when it unfolds. The automatic protection device for the extruder also includes a host computer, which is communicatively connected to the extruder and the cylinder, and is used to control the extruder and the frame in a coordinated manner; wherein, when the extruder is turned on, the automatic unfolding time of the frame shall not exceed 8 seconds.

[0023] Beneficial effects: A limit switch is fixedly installed at the edge of the frame to limit the maximum stroke of the cylinder, ensuring that the frame can just cover the crushing opening when it unfolds. This measure can further improve the accuracy and reliability of the protective device, ensuring that the frame accurately covers the crushing opening each time it unfolds, avoiding protective gaps caused by incomplete frame unfolding. It also helps protect the cylinder, preventing it from being damaged due to excessive stroke, and extending the service life of the equipment.

[0024] Preferably, the automatic protection device for the extruder also includes a host computer, which is communicatively connected to the extruder and the cylinder, and is used to control the extruder and the frame in a coordinated manner; wherein, when the extruder is turned on, the automatic unfolding time of the frame is no more than 8 seconds.

[0025] Beneficial effects: By establishing a communication connection between the host computer and the extruder and cylinder, the extruder and the frame are linked for control, and the automatic deployment time of the frame when the extruder starts does not exceed 8 seconds. This linkage control method enables the protective device to work closely with the working state of the extruder, ensuring that the protective device can respond and deploy rapidly the instant the extruder starts, providing timely protection for the crushing opening. This greatly improves the timeliness and effectiveness of protection, while also increasing the automation and coordination of the production process, further enhancing production efficiency and safety.

[0026] Preferably, the area of ​​the transparent protective cover is not less than 8 square meters.

[0027] Beneficial effects: The area of ​​the transparent protective cover is no less than 8 square meters. The larger protective cover area can better cover the crushing opening and its surrounding area, providing more comprehensive protection and effectively preventing risks such as dust spillage and personnel falling. At the same time, it also provides workers with a wider field of vision, making it easier to observe the working condition of the extruder, further improving the protective effect and practicality of the protective device.

[0028] Beneficial effects of this utility model

[0029] Compared with existing technologies, this utility model improves the triple technical effect of "safety protection + environmental management + production collaboration" through the integrated design of automated protection and dust control.

[0030] Specifically, the dust collection efficiency is above 90%, with the dust concentration at 1 meter from the top of the extruder's crushing opening not exceeding 5 mg / m³, ensuring that the dust concentration in the workshop meets standards, improving the working environment, and reducing occupational health hazards. Simultaneously, the energy consumption of the existing dust collection system required for installation in the workshop is reduced by 15%-20%, saving approximately 53,000 yuan in electricity costs annually. Furthermore, the efficiency of the extruder is increased by 10% from the time of single feeding to the extrusion cycle, increasing annual productivity by approximately 300 tons. Moreover, it eliminates the risk of personnel falling into the extruder and mechanical injuries, reducing the incidence of workshop safety accidents.

[0031] First, it achieves a safety protection effect. By installing a frame and transparent protective cover in the open working area of ​​the extruder, the transparent protective cover covers the crushing opening, preventing personnel from falling. Due to the inherent characteristics of the extruder, material may not be effectively crushed during the extrusion process, leading to blockages. Therefore, a crushing opening is made on the extruder. The area where the crushing opening is located is the open working area of ​​the extruder. The purpose of the crushing opening is to allow operators to handle blockages or insufficient material feeding during the extrusion process. To ensure the stability of the extruder, the crushing opening area is relatively small. Currently, blockages can only be resolved manually with a stirring rod, or by manually adding material to address insufficient material extrusion. For production safety and to eliminate the need for manual handling of blockages with a stirring rod, an observation port is also provided on the transparent protective cover. The observation port is no higher than 600mm, allowing maintenance personnel to handle blockages through the observation port while preventing individuals from falling into the extruder.

[0032] Secondly, it addresses environmental issues by significantly reducing dust pollution in the workshop. Extrusion presses generate substantial amounts of dust during the extrusion process, which disperses through the crushing opening. Even with a built-in dust collection system near the crushing opening, the dust cannot be completely contained. Therefore, by installing a frame and transparent protective cover over the open operating area of ​​the extruder, effectively enclosing the crushing opening, the dust can be trapped within, allowing it to accumulate and be centrally processed by the dust collection system. This significantly reduces dust pollution in the workshop and minimizes its impact on worker health.

[0033] Meanwhile, the original extruder's operating mode involved a single operator using a 5-ton single-girder overhead crane to hoist materials requiring crushing, such as raw and cooked anodes, to the crushing opening (the extruder was positioned above a platform approximately 2.5 meters high; the crushing opening was 900mm x 1200mm open, and the extruder's own components, including the fixed plate, moving nail plate, and pushing cylinder, were recessed). After the material was fed into the extruder chamber through the crushing opening, the operator manually activated the 500-ton hydraulic station and pressed a button to move the cylinder forward to crush the 1550mm x 650mm x 630mm material. Because the extruder was open, it generated a large amount of dust during the crushing process, polluting the environment. Additionally, some material spilled onto the steel platform around the opening, requiring operators to regularly clean the spilled material and accumulated dust around the extrusion opening. This not only affected operational efficiency but also posed a risk of personnel bumping into or slipping and falling into the extrusion opening, causing personal injury. Furthermore, due to current environmental pressures, the large amount of dust generated during operation urgently needed effective control. This utility model employs an automatic protective device for extruders, specifically designed to effectively solve the problems of material spillage and dust generation during the extrusion process. Through cylinder control on both sides of the transparent protective cover, which is interlocked with the hydraulic cylinders of the 500-ton extruder, the transparent protective cover immediately closes when material is placed into the extrusion opening, creating a sealed protection for the extruder's crushing opening (open opening). This transparent protective cover allows operators to easily observe the internal material crushing process. After the material is completely crushed, the hydraulic system installed within the 500-ton mounting block retracts. This hydraulic system acts on the extruder and is a common component in existing extruders. Once the hydraulic system has retracted to its original position, the protective cover immediately reopens for the next batch of material. The design and application of this extruder protective cover not only solves the problem of material spillage during extrusion but also effectively controls dust generation. It fundamentally eliminates the safety risk of operators falling into the extruder, while simultaneously reducing the labor intensity of operators, increasing work efficiency by 10%, and increasing annual production by approximately 300 tons. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of an automatic protection device for an extruder, as shown in the embodiment. Detailed Implementation

[0035] The reference numerals in the accompanying drawings include:

[0036] Frame 1, Transparent protective cover 2, Cylinder 3, Observation port 4, Fixing block 5, Crushing opening 6, Mounting block 7, Bottom frame 11, Middle frame 12, Top frame 13.

[0037] Example

[0038] like Figure 1As shown in the figure, this embodiment provides an automatic protection device for an extruder, which includes a fan-shaped skeleton 1, a transparent protective cover in a fan-shaped structure, two cylinders 3, and a host computer.

[0039] Specifically, the extruder includes a mounting block 7, which is located on the open working area of the extruder and close to the crushing opening 6 of the extruder. The mounting block 7 contains existing driving devices of the extruder. The skeleton 1 is welded on the open working area of the extruder. The open working area of the extruder refers to the area around the crushing opening 6 of the extruder. The skeleton 1 surrounds the crushing opening 6, and the transparent protective cover is fixedly installed on the skeleton 1 and can completely unfold to cover the skeleton 1, which is used to enclose the crushing opening 6 in a closed manner. The two cylinders 3 are respectively installed on one side of the skeleton 1, and are separated from the crushing opening 6 by the skeleton 1. One end of the cylinder 3 is hinged to the mounting block 7, and the other end is hinged to the lower edge of the skeleton 1, which is used to drive the skeleton 1 to unfold or close.

[0040] Specifically, the skeleton 1 includes multiple layers of frames, and three flexible connection strips are fixedly connected between each layer of frames. In this embodiment, the flexible connection strip includes flexible lines, and each flexible line is provided with a second fixed point. Each second fixed point corresponds to each layer of frames, and the flexible lines are fixedly connected to each layer of frames through the second fixed points.

[0041] From the bottom to the top of the multiple layers of frames, the area surrounded by each frame decreases in turn; when the skeleton 1 contracts, the frame at the bottom moves upward in an arc, and the frames are successively abutted and contracted upward. In this embodiment, from the bottom to the top is just like Figure 1 the direction is from bottom to top. Specifically, taking the crushing opening 6 as the direction reference plane, upward from the crushing opening 6 is from bottom to top. For the convenience of description, this embodiment is provided with 5 layers of frames, including a bottom frame 11, multiple middle frames 12, and a top frame 13. Each layer of frame is in a semi-surrounding structure similar to a "凵" shape structure. The surrounded area of each layer of frame from large to small is the bottom frame 11, multiple middle frames 12, and the top frame 13 in turn. The fixing block 5 is fixedly installed on the open working area of the extruder and close to the skeleton 1; multiple pivot points are provided on the fixing block 5, and each pivot point corresponds to the bottom frame 11, the first middle frame, the second middle frame, the third middle frame, and the fourth middle frame respectively. The fixing block 5 is pivotally connected to each layer of frames through the pivot points. The cylinder 3 is hinged to the bottom frame 11. When the cylinder 3 contracts, the bottom frame 11 moves upward in a circular motion, successively abuts against each middle frame 12, and pushes each middle frame 12 to abut against the top frame 13. When it abuts against the top frame 13, the contraction of the skeleton 1 is completed, and the stroke of the cylinder 3 is no more than 1500 mm.

[0042] The host computer is electrically connected to both the extruder and the existing extruder drive mechanism within mounting block 7, and is used to control the extruder and the bottom frame 11 in a coordinated manner. When the extruder is activated, the automatic unfolding time of the frame 1 does not exceed 8 seconds. In this embodiment, the program code used by the host computer is existing. The host computer is mainly used to identify the opening / closing of the extruder. When the extruder is activated, the host computer transmits an activation signal to the existing extruder drive mechanism within mounting block 7, which then pushes cylinder 3 to open frame 1, causing frame 1 to unfold. When the extruder is closed, the host computer transmits a closure signal to the existing extruder drive mechanism within mounting block 7, which then pushes cylinder 3 to retract frame 1. The automatic unfolding time of frame 1 when the extruder is activated does not exceed 8 seconds.

[0043] Specifically, the transparent protective cover also has an observation opening 4, the height of which is no higher than 500mm. The observation opening 4 is not on the same plane as the cylinder 3, but on the plane between the two cylinders 3 located on different surfaces. An automatic protection device for an extruder also includes a limit switch, which limits the maximum stroke of the cylinder 3 to ensure that the frame 1 can completely and completely close the crushing opening 6 when deployed. The cylinder 3 is a GY220 type, with a stroke not exceeding 1500mm. The area of ​​the transparent protective cover is no less than 8 square meters.

[0044] The usage principle of this embodiment

[0045] When the host computer detects that the extruder has started, it transmits the start signal to cylinder 3. At this time, cylinder 3 will extend the frame 1. Specifically, cylinder 3 drives the bottom frame 11 to move downward in an arc. When the bottom frame 11 moves downward, since the bottom frame 11, the middle frame 12, and the top frame 13 all have flexible connecting strips, the flexible connecting strips will also pull the middle frame 12 downward in an arc. When the limit switch touches the working surface around the crushing opening 6 (the plane of the open working area of ​​the extruder), or when the maximum stroke of 1500mm is reached, cylinder 3 stops moving. At this time, the transparent protective cover, which is fixed on the frame 1, will also fully unfold as the frame 1 unfolds to cover the crushing opening 6.

[0046] When the host computer detects that the extruder is off, it transmits a shutdown signal to cylinder 3. Cylinder 3 then retracts the frame 1. Specifically, cylinder 3 drives the bottom frame 11 to move upward in an arc. As the bottom frame 11 moves upward, because its area is larger than that of the middle frame 12 and it can closely adhere to the middle frame 12, it pushes the middle frame 12 upward in an arc (circular motion) until it touches the top frame 13. At this point, the single-beam overhead crane hoists the material to the crushing opening 6, and the material is fed into the extruder chamber through the crushing opening 6.

[0047] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] It should be understood that the term "and / or" used in this document is merely a description of the same field in the related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0050] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

[0051] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An automatic protection device for an extruder, the extruder including a mounting block located in the open operating area of ​​the extruder and close to the crushing opening of the extruder, characterized in that, The automatic protection device for the extruder is installed on the extruder and includes: The frame is fixedly installed in the open working area of ​​the extruder, located above the crushing opening of the extruder, and is used to surround the crushing opening; A transparent protective cover is fixedly connected to the frame, covers the frame, and is used to seal off the broken opening. The cylinder is mounted on one side of the frame, with one end hinged to the mounting block and the other end hinged to the frame, and is used to drive the frame to open or close.

2. The automatic protection device for an extruder according to claim 1, characterized in that, The skeleton includes a multi-layer frame, with flexible connecting strips fixedly connected between each layer of the frame; The multi-layered frame decreases in area from bottom to top.

3. The automatic protection device for an extruder according to claim 2, characterized in that, The frame consists of a bottom frame, a middle frame, and a top frame, from bottom to top. A fixing block is fixedly installed in the open working area of ​​the extruder, close to the frame; the fixing block is provided with multiple pivot points, each of which corresponds to the bottom frame and the middle frame respectively, and the fixing block is pivotally connected to the bottom frame and the middle frame respectively through the pivot points; The fixing block is also provided with a first fixing point, which corresponds to the top frame. The fixing block is fixedly connected to the top frame through the first fixing point.

4. The automatic protection device for an extruder according to claim 2, characterized in that, The flexible connecting strip has multiple second fixing points, each of which corresponds to a frame layer. The flexible connecting strip is fixedly connected to each frame layer through the second fixing points.

5. An automatic protection device for an extruder according to claim 3, characterized in that, The skeleton is hinged to the bottom frame.

6. An automatic protection device for an extruder according to claim 1, characterized in that, An observation opening is also provided on the transparent protective cover, and the distance between the observation opening and the breakage opening is no more than 500mm.

7. An automatic protection device for an extruder according to claim 1, characterized in that, The cylinder stroke is no more than 1500mm.

8. An automatic protection device for an extruder according to claim 1, characterized in that, Limit switches are fixedly installed on the edge of the frame; the limit switches are used to limit the maximum stroke of the cylinder to ensure that the frame can just cover the crushing opening when it is deployed.

9. An automatic protection device for an extruder according to claim 1, characterized in that, The automatic protection device for the extruder also includes a host computer, which is connected to the extruder and the cylinder respectively, and is used to control the extruder and the frame in a coordinated manner; when the extruder is turned on, the automatic deployment time of the frame shall not exceed 8 seconds.

10. An automatic protection device for an extruder according to claim 1, characterized in that, The area of ​​the transparent protective cover shall not be less than 8 square meters.

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