Screen assembly and crusher

Abstract

This utility model belongs to the field of pulverizer technology, specifically relating to a screen assembly and a pulverizer. The screen assembly includes a fixed screen frame; a movable screen frame; and a locking device, which includes a piston mechanism, a swing arm, a linkage rod, and a chuck. The cylinder of the piston mechanism is hinged, and the rod of the piston mechanism is hinged to one end of the swing arm. The linkage rod is parallel to the axial direction of the screen frame and can rotate along its own central axis. The other end of the swing arm is fixedly connected to the linkage rod. The tail of the chuck is fixedly connected to the linkage rod, and the head of the chuck locks or unlocks the movable screen frame when it rotates to the closed position at the top of the movable screen frame. The screen assembly uses a locking device to lock and unlock the movable screen frame. By extending and retracting the fixed piston mechanism, the locking force of the chuck on the movable screen is automatically and precisely controlled, and automatic locking and unlocking operations can be achieved. It occupies little space, has a compact layout, reduces the intensity of manual operation, and helps to efficiently replace the screen.

Description

Technical Field

[0001] This utility model relates to the field of crusher technology, and in particular to a screen assembly and a crusher. Background Technology

[0002] Crushers are widely used in food processing, feed production, and other fields. Their core components include the crushing screw and the screen assembly. Among them, the screen is a vulnerable part that suffers high wear during continuous operation and needs to be frequently disassembled and replaced to meet the equipment's performance requirements.

[0003] Screen assemblies typically consist of a fixed screen frame and a movable screen frame. The two screen frames are usually locked together using either a nut or a linkage mechanism. Using a nut for locking has two drawbacks: firstly, the need for multiple turns of the threaded connection leads to longer screen replacement times; secondly, insufficient nut tightening force can cause the screen frame to loosen, while excessive nut tightening force can cause the screen assembly to deform.

[0004] The locking method using a linkage mechanism utilizes the deformation force of a spring amplified by a lever to achieve locking. However, this method has the problem of difficulty in manual operation due to excessive resistance when opening and closing the operating handle. If the operating force needs to be reduced by lengthening the lever arm of the handle, not only will the overall size of the locking device increase, but also a large space needs to be reserved for opening and closing the handle, which goes against the trend of miniaturization of equipment design. Utility Model Content

[0005] Based on this, the present invention provides a screen assembly and a crusher, the screen assembly being able to ensure the accuracy of the locking force.

[0006] According to an embodiment of the present invention, a first aspect provides a screen assembly, comprising:

[0007] A fixed screen frame is provided with an opening on its circumferential side;

[0008] The movable screen frame is hinged at the bottom, allowing the top of the movable screen frame to rotate around the hinged position to a closed position and an open position;

[0009] The locking device includes a piston mechanism, a rocker arm, a linkage rod, and a pawl;

[0010] The cylinder of the piston mechanism is hinged, and the rod of the piston mechanism is hinged to one end of the swing arm;

[0011] The linkage rod is parallel to the axial direction of the screen frame and can rotate along its own central axis; the other end of the swing arm is fixedly connected to the linkage rod.

[0012] The tail of the claw is fixedly connected to the linkage rod, and the head of the claw locks or unlocks the movable screen frame when it rotates to the closed position at the top of the movable screen frame.

[0013] In some embodiments, the swing arm and the pawl are arranged on opposite sides of the linkage rod in the circumferential direction.

[0014] In some embodiments, the claw head is provided with an adjustable tightening bolt, which extends from the side of the claw away from the movable screen frame to the side near the movable screen frame, and the claw applies a locking force to the movable screen frame through the tightening bolt.

[0015] In some embodiments, a latch is provided on the outer side wall of the movable screen frame near its top, the latch being used to cooperate with the claw head to achieve a locking operation of the movable screen frame.

[0016] In some embodiments, the latch is U-shaped, with the opening of the latch facing outwards from the movable screen frame.

[0017] In some embodiments, the device further includes a buckle, a mounting bracket, and a spring, wherein the buckle is disposed on the movable screen, the mounting bracket is correspondingly disposed on the fixed screen, and the spring provides an elastic force to keep the buckle and the mounting bracket locked together.

[0018] In some embodiments, the buckle is hinged to the movable screen frame at the middle, the buckle head is provided with a hook-shaped snap connector, the buckle seat is provided with a snap-fit ​​part that matches the snap connector, and the spring pushes the buckle to make the snap connector embed and lock in the snap-fit ​​part.

[0019] In some embodiments, the piston mechanism is a double-acting cylinder.

[0020] In some embodiments, an electronically controlled switch is further included, which is electrically connected to the piston mechanism to control the extension and retraction state of the piston mechanism.

[0021] According to an embodiment of this utility model, a second aspect provides a pulverizer in which the aforementioned screen assembly is provided.

[0022] In this embodiment, the screen assembly uses a locking device to lock and unlock the movable screen frame. By adjusting the extension and retraction stroke of the fixed piston mechanism, the locking force of the chuck on the movable screen is automatically and precisely controlled. During the reciprocating extension and retraction of the piston mechanism's rod, the moving rod drives the swing arm to swing around the central axis of the linkage rod. The swinging swing arm drives the linkage rod to rotate along the central axis of the linkage rod. The rotating linkage rod drives the chuck to swing along the central axis of the linkage rod, so that when the chuck head rotates to the closed position at the top of the movable screen frame, it locks or unlocks the movable screen frame.

[0023] Compared to traditional screen assemblies that use nuts for locking, this solution avoids problems such as screen frame loosening due to insufficient nut tightening force or screen assembly deformation due to excessive nut tightening force. Compared to traditional screen assemblies that use linkage mechanisms for locking, this solution eliminates the need for long handles and reserved space for handle opening and closing, and enables automatic locking and unlocking operations. Its small footprint and compact layout reduce the intensity of manual operation and facilitate efficient screen replacement. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a screen assembly according to one embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the movable screen frame in the open and closed positions according to one embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the locking device in the locked state according to one embodiment of this application;

[0027] Figure 4 for Figure 1 Enlarged structural diagram at point A;

[0028] Figure 5 for Figure 2 A magnified structural diagram at point B in the middle.

[0029] In the figure: housing 10; fixed screen frame 20; movable screen frame 21; hinge shaft 22; hinge plate 23; hinge seat 24; fixed seat 25; cylinder 30; rod 31; swing arm 32; linkage rod 33; claw 34; tightening bolt 35; lock 36; buckle 40; buckle seat 41; buckle connector 42; electric control switch 50. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0032] The orientations or positional relationships indicated by terms such as "upper," "lower," "inner," "outer," "axial," and "circumferential" in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] This embodiment provides a screen assembly configured in a crusher. Figure 1 As shown, this screen assembly includes a housing 10, a fixed screen frame 20, a movable screen frame 21, and a locking device. The screen frame assembly formed by the fixed screen frame 20 and the movable screen frame 21 has a hollow cylindrical structure with its central axis parallel to the horizontal plane.

[0034] In this embodiment, the fixed screen frame 20 is fixedly connected to the housing 10, and an opening is provided on its circumferential side, which penetrates the inner and outer surfaces of the fixed screen frame 20. It should be noted that the aforementioned side specifically refers to a section of the arc surface of the fixed screen frame 20 along the circumferential direction.

[0035] See details Figure 1 and 2 In this embodiment, the bottom of the movable screen frame 21 is hinged to the fixed screen frame 20 or the housing 10, so that the top of the movable screen frame 21 can rotate around the hinge position to the open position and the closed position to open and close the opening. When the top of the movable screen frame 21 rotates to the closed position, the top of the movable screen frame 21 abuts against the top edge of the opening of the fixed screen frame 20, so that the opening is completely closed; when the top of the movable screen frame 21 rotates to the open position, the top of the movable screen frame 21 moves radially away from the fixed screen frame 20, so that the opening is completely exposed.

[0036] See details Figure 1 and 3 The locking device in this embodiment includes a piston mechanism, a swing arm 32, a linkage rod 33, and a pawl 34. The piston mechanism includes a cylinder 30 and a rod 31 that can move relative to the cylinder 30. The cylinder 30 is hinged to a fixed screen frame 20 or a housing 10, and the cylinder 30 is hinged to one end of the swing arm 32. The piston mechanism can be selected as a pneumatic cylinder or a hydraulic cylinder as needed. In this embodiment, a double-acting pneumatic cylinder with precise control and high output force is preferred.

[0037] See details Figure 1In this embodiment, the linkage rod 33 is parallel to the axial direction of the screen frame and is specifically arranged near the top edge of the opening. The linkage rod 33 can rotate around its own central axis and is fixedly connected to the other end of the swing arm 32. The tail of the claw 34 is fixedly connected to the linkage rod 33, and the head of the claw 34 can swing during the rotation of the linkage rod 33 to perform locking or unlocking operations. The claws 34 are specifically arranged at intervals along the axial direction of the linkage rod 33, and the number of claws 34 can be set according to actual needs.

[0038] In this embodiment, the screen assembly uses a locking device to lock and unlock the movable screen frame 21. By adjusting the extension and retraction stroke of the fixed piston mechanism, the locking force of the chuck 34 on the movable screen is automatically and precisely controlled. During the reciprocating extension and retraction of the piston mechanism rod 31, the moving rod 31 drives the swing arm 32 to swing around the central axis of the linkage rod 33. The swinging swing arm 32 drives the linkage rod 33 to rotate along the central axis of the linkage rod 33. The rotating linkage rod 33 drives the chuck 34 to swing along the central axis of the linkage rod 33, so that when the head of the chuck 34 rotates to the closed position at the top of the movable screen frame 21, it locks or unlocks the movable screen frame 21.

[0039] Compared to traditional screen assemblies that use nuts for locking, this solution avoids problems such as screen frame loosening due to insufficient nut tightening force or screen assembly deformation due to excessive nut tightening force. Compared to traditional screen assemblies that use linkage mechanisms for locking, this solution eliminates the need for long handles and reserved space for handle opening and closing, and enables automatic locking and unlocking operations. Its small footprint and compact layout reduce the intensity of manual operation and facilitate efficient screen replacement.

[0040] See details Figure 1 In this embodiment, the movable screen frame 21 is provided with a hinge shaft 22 at its bottom. The hinge shaft 22 is arranged parallel to the axial direction of the screen frame, and both ends of the hinge shaft 22 are connected to the inner wall of the housing 10 through hinge plates 23, allowing the movable screen frame 21 to rotate along the hinge shaft 22. The cylinder 30 is hinged to the inner wall of the housing 10 via a hinge seat 24 on the outer side of the screen frame end, allowing the piston mechanism to swing relative to the housing 10 to a certain extent, thereby avoiding interference during movement. The linkage rod 33 is connected to the inner top of the housing 10 through a fixed seat 25 to ensure that the linkage rod 33 is securely installed.

[0041] In this embodiment, the swing arm 32 and the pawl 34 are preferably arranged on opposite sides of the linkage rod 33 in the circumferential direction. That is, the pawl 34 swings on the side of the linkage rod 33 closer to the outside of the housing 10, and the swing arm 32 swings on the side of the linkage rod 33 closer to the inside of the housing 10, so as to avoid interference between the movements of the swing arm 32 and the pawl 34 on the same side of the linkage rod 33. When the piston mechanism rod 31 drives the swing arm 32 to swing upward relative to the linkage rod 33, the pawl 34 swings downward relative to the linkage rod 33 to achieve the locking operation; when the piston mechanism rod 31 drives the swing arm 32 to swing downward relative to the linkage rod 33, the pawl 34 swings upward relative to the linkage rod 33 to achieve the unlocking operation.

[0042] See details Figure 1 In this embodiment, the head of the claw 34 is equipped with an adjustable tightening bolt 35. The tightening bolt 35 extends from the side of the claw 34 away from the movable screen frame 21 to the side closer to the movable screen frame 21. The claw 34 applies a locking force to the movable screen frame 21 through the tightening bolt 35. By adjusting the depth of the tightening bolt 35 being screwed in / out, i.e., adjusting the distance the tightening bolt 35 extends out of the head of the claw 34 towards the movable screen frame 21, the magnitude of the locking force applied to the movable screen frame 21 can be precisely fine-tuned. This structural design significantly improves the accuracy of locking force control.

[0043] In this embodiment, a latch 36 is provided near the top of the outer side wall of the movable screen frame 21. The latch 36 is used to engage with the head of the claw 34 to lock the movable screen frame 21. The latch 36 is preferably U-shaped, with its opening facing the outer side of the movable screen frame 21. During the locking operation, the claw 34 moves the tightening bolt 35 at its head, allowing it to enter the U-shaped interior space of the latch 36 from the opening side. In the locked state, the tightening bolt 35 abuts against the inner wall of the U-shaped latch 36. The design of the U-shaped latch 36 and the claw 34 ensures that the locking force is applied to the structurally strong U-shaped latch 36 through the tightening bolt 35, rather than directly pressing the movable screen frame 21. This effectively avoids local deformation or damage to the movable screen frame 21 that may occur due to direct exposure to the locking force, thereby helping to extend the service life of the movable screen frame 21.

[0044] See details Figure 5 The screen assembly of this embodiment also includes a buckle 40, a mounting base 41, and a spring. The buckle 40 is disposed on the movable screen, and the mounting base 41 is disposed on the fixed screen. The spring provides elastic force to keep the buckle 40 and the mounting base 41 locked together. Specifically, the buckle 40 is hinged to the movable screen frame 21 in the middle, allowing the buckle 40 to rotate around the hinge position. The head of the buckle 40 is provided with a hook-shaped locking head 42, and the tail of the buckle 40 is a pressing part for easy manual operation. The mounting base 41 is provided with a fastening part that matches the locking head 42. The spring is preferably a torsion spring, which is disposed at the hinge position of the buckle 40.

[0045] When the locking device is in the locked state, the spring pushes the buckle 40 to insert and lock the connector 42 into the fastening part, forming a reliable mechanical connection. When it is necessary to separate the movable screen frame 21 from the fixed screen frame 20, with the locking device unlocked, the tail of the buckle 40 is manually pressed to overcome the spring force, causing the connector 42 to disengage from the fastening part, thereby releasing the seat 41. The buckle 40 and the seat 41 cooperate to form an anti-detachment structure, which can effectively prevent the movable screen frame 21 from separating from the fixed screen frame 20 due to the failure of the locking device, and enhance the stability and reliability of the connection between the movable screen frame 21 and the fixed screen frame 20.

[0046] The screen assembly in this embodiment also includes an electric control switch 50, which is preferably located on the top outer side of the housing 10. The electric control switch 50 is configured to receive user operation commands, which can be selected from manual buttons, remote signals, and sensor signals as needed. The electric control switch 50 establishes an electrical connection with the piston mechanism via selectable electrical connection lines such as wires or circuit boards, or wireless connection methods such as Bluetooth or Wi-Fi. The electric control switch 50 is used to control the extension and retraction state of the piston mechanism, realizing the automatic switching of the locking device to the locked / unlocked state of the movable screen frame 21, and enabling the operation process during screen replacement or maintenance. Some embodiments can be equipped with a manual valve to manually control the extension and retraction state as needed. It should be noted that the circuit structure and control program for controlling the extension and retraction of the piston mechanism using the electric control switch 50 are existing technologies, and therefore will not be described in detail in this embodiment.

[0047] The screen replacement process of the screen assembly in this embodiment is as follows: First, operate the electric control switch 50 to the "on" position. The electric control switch 50 controls the piston mechanism rod 31 to retract into the cylinder 30. At this time, the rod 31 pulls the swing arm 32 and the end connected to it to swing downward along the linkage rod 33, so that the head of the pawl 34 swings upward along the linkage rod 33 to achieve the unlocking operation. Then, manually operate the tail of the buckle 40 to disengage the buckle connector 42 from the buckle seat 41. Next, rotate the piston screen frame to the open position to complete the screen replacement. After the screen replacement is completed, rotate the piston screen frame to the closed position. The spring provides elasticity to make the buckle connector 42 embed into the buckle seat 41. Finally, operate the electric control switch 50 to the "off" position. The electric control switch 50 controls the piston mechanism rod 31 to extend out of the cylinder 30. At this time, the rod 31 pushes the swing arm 32 and the end connected to it to swing upward along the linkage rod 33, so that the head of the pawl 34 swings downward along the linkage rod 33 to achieve the locking operation.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A screen assembly, characterized in that, include: A fixed screen frame (20) has an opening on its circumferential side; The movable screen frame (21) is hinged at the bottom, so that the top of the movable screen frame (21) can rotate around the hinge position to the closed position and the open position; The locking device includes a piston mechanism, a rocker arm (32), a linkage rod (33), and a pawl (34). The cylinder (30) of the piston mechanism is hinged, and the rod (31) of the piston mechanism is hinged to one end of the swing arm (32); The linkage rod (33) is parallel to the axial direction of the screen frame and can rotate along its own central axis. The other end of the swing arm (32) is fixedly connected to the linkage rod (33). The tail of the claw (34) is fixedly connected to the linkage rod (33). When the head of the claw (34) rotates to the closed position on the top of the movable screen frame (21), it locks or unlocks the movable screen frame (21).

2. The screen assembly of claim 1, wherein: The swing arm (32) and the pawl (34) are arranged on opposite sides of the linkage rod (33) in the circumferential direction.

3. The screen assembly of claim 1, wherein: The head of the claw (34) is provided with an adjustable tightening bolt (35). The tightening bolt (35) extends from the side of the claw (34) away from the movable screen frame (21) to the side close to the movable screen frame (21). The claw (34) applies a locking force to the movable screen frame (21) through the tightening bolt (35).

4. The screen assembly of any of claims 1-3, wherein: A latch (36) is provided on the outer side wall of the movable screen frame (21) near its top. The latch (36) is used to cooperate with the head of the claw (34) to realize the locking operation of the movable screen frame (21).

5. The screen assembly of claim 4, wherein: The latch (36) is U-shaped, and the opening of the latch (36) faces the outside of the movable screen frame (21).

6. The screen assembly of any of claims 1-3, wherein: It also includes a buckle (40), a seat (41) and a spring, wherein the buckle (40) is disposed on the movable screen frame (21), the seat (41) is disposed on the fixed screen frame (20), and the spring provides elastic force to keep the buckle (40) and the seat (41) locked together.

7. The screen assembly according to claim 6, characterized in that: The buckle (40) is hinged to the movable screen frame (21) in the middle. The head of the buckle (40) is provided with a hook-shaped buckle head (42). The buckle seat (41) is provided with a fastening part that matches the buckle head (42). The spring pushes the buckle (40) to make the buckle head (42) embed and lock in the fastening part.

8. The screen assembly of any of claims 1-3, wherein: The piston mechanism is a double-acting cylinder.

9. The screen assembly of any of claims 1-3, wherein: It also includes an electric control switch (50) which is electrically connected to the piston mechanism to control the extension and retraction state of the piston mechanism.

10. A shredder characterized by: The pulverizer includes the screen assembly as described in any one of claims 1-9.

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