Master batch grading and screening device

Abstract

The utility model relates to the technical field of screening machines, in particular to a master batch grading and screening device which comprises a screening box, a vibration motor capable of driving the screening box to vibrate up and down, a screen located in the screening box, a first discharging opening and a second discharging opening, and the first discharging opening and the second discharging opening are used for discharging materials. A positioning assembly is arranged between the screen and the screening box, in the first mode, the positioning assembly can make the screen and the screening box vibrate synchronously, and in the second mode, the screen can slide up and down in the screening box and can collide with the positioning assembly. According to the device, through the two switchable working modes of the screen, the normal screening requirement can be met, particles blocking the screen holes can be effectively removed through the relative movement and impact mode of the screen, and the screening efficiency and reliability are improved. And frequent shutdown maintenance is not needed, the continuity and automation level of equipment operation are improved, and the device is suitable for efficient screening of granular materials such as plastic master batches.

Description

Technical Field

[0001] This utility model relates to the field of screening machine technology, and in particular to a masterbatch grading and screening device. Background Technology

[0002] After pelleting, plastic masterbatches typically require sieving to remove sized particles and powder, ensuring the uniformity and purity of the finished particles. Existing sieving equipment widely used in technology includes vibrating screens, drum screens, and air classifiers. Among these, vibrating screens are the most common, using a motor-driven eccentric device to cause the screen and frame to vibrate periodically, achieving particle grading and sieving.

[0003] In this type of screening structure, the screen is usually fixed to the frame and vibrates synchronously with the frame to maintain screening efficiency. However, during continuous operation, due to factors such as inter-particle friction, electrostatic adsorption, and the screen hole structure, the screen is prone to clogging, leading to decreased screening efficiency, increased particle size distribution deviation, and even problems such as material mixing and screen overload.

[0004] Existing technologies typically involve shutting down the machine for cleaning, which disrupts the continuous operation of the equipment. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies that typically involve stopping the machine for cleaning, which affects the continuous operation of the equipment, and to propose a masterbatch grading and screening device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A masterbatch grading and screening device includes a screening box, a vibrating motor capable of driving the screening box to vibrate up and down, a screen located inside the screening box, a first discharge port and a second discharge port for discharging material. The screen is slidably connected to the screening box up and down. A positioning component is provided between the screen and the screening box. In a first mode, the positioning component enables the screen and the screening box to vibrate synchronously. In a second mode, the screen can slide up and down inside the screening box and can collide with the positioning component.

[0008] Guide blocks are fixed around the screen, and the screen slides with the screening box through the guide blocks. A limit block is fixed inside the screening box above the guide blocks, and the positioning component can change the size of the movable gap between the limit block and the guide block.

[0009] The positioning component includes a cam that corresponds to a guide block. The cam is eccentrically fixed to a support shaft, which is rotatably connected to the screening box. The support shaft is driven by a power mechanism that can drive it to rotate. The bottom end of the guide block is supported on the outer circumferential surface of the cam. When the cam is in its highest position, the top end of the guide block abuts against the limiting block. This is the first mode.

[0010] The power mechanism is a manually controlled handwheel.

[0011] The power mechanism includes a rotary motor, which is fixed to the ground. The power output shaft of the rotary motor is fixed to one of the support shafts via a deformable transmission shaft, and multiple support shafts are connected in a transmission manner.

[0012] The deformable drive shaft is a universal coupling or a rubber roller.

[0013] The rotating motor is electrically connected to a controller, which can start the rotating motor at regular intervals.

[0014] The present invention discloses a masterbatch grading and screening device, which has the following advantages: This device, through two switchable working modes of the screen, not only meets normal screening requirements but also effectively removes particles clogging the screen holes through the relative movement and impact of the screen, improving screening efficiency and reliability. It eliminates the need for frequent downtime maintenance, enhancing the continuity and automation level of equipment operation, and is suitable for the efficient screening of granular materials such as plastic masterbatches. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first mode structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the second mode structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the distribution structure of the screen and positioning components of this utility model;

[0018] Figure 4 This is a schematic diagram of the power mechanism transmission method of this utility model.

[0019] In the diagram: 1. Screen 2. Guide block 3. Limiting block 4. Cam 5. Support shaft 6. Screening box 7. Vibrating motor 8. First discharge port 9. Second discharge port 10. Movable gap 11. Frame 11. Screen plate 12. Deformable transmission shaft 13. Rotary motor 14. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1-4 A masterbatch grading and screening device includes a screening box 6, a vibration motor 7 capable of driving the screening box 6 to vibrate up and down, a screen 1 located inside the screening box 6, a first discharge port 8 for discharging material, and a second discharge port 9. The screen 1 is slidably connected to the screening box 6 up and down. A positioning component is provided between the screen 1 and the screening box 6. In a first mode, the positioning component enables the screen 1 and the screening box 6 to vibrate synchronously. In a second mode, the screen 1 can slide up and down inside the screening box 6 and the screen 1 can collide with the positioning component.

[0022] This utility model provides a masterbatch grading and screening device. Through the upper and lower sliding connection structure between the screen and the screening box, and the setting of the positioning component, the screen can have two working states. In the first mode, the positioning component is in a limited state, the screen is fixed in the screening box and does not undergo relative displacement, and can vibrate synchronously with the screening box to realize the conventional particle screening function, ensuring that the material is efficiently graded and discharged according to particle size.

[0023] In the second mode, the positioning component changes its limiting state, creating a space between the screen and the screening box that allows for vertical sliding. As the screening box vibrates, the screen slides up and down relative to the screening box due to inertia and collides with the positioning component, thus physically cleaning particles adhering to or clogging the screen.

[0024] This device features two switchable screen operating modes, which not only meet normal screening needs but also effectively remove particles clogging the screen holes through the relative movement and impact of the screen, improving screening efficiency and reliability. It eliminates the need for frequent downtime for maintenance, enhancing the continuity and automation of equipment operation, and is suitable for the efficient screening of granular materials such as plastic masterbatches.

[0025] The screen 1 is fixedly connected to the four sides of the guide block 2. The screen 1 slides with the screening box 6 through the guide block 2. The screening box 6 is fixedly connected to the limit block 3 above the guide block 2. The positioning component can change the size of the movable gap 10 between the limit block 3 and the guide block 2.

[0026] In this embodiment, guide blocks, such as four guide blocks, are arranged around the screen. The guide blocks slide in conjunction with the screening box, allowing the screen to slide up and down within the screening box. Inside the screening box, a limit block is located above the guide blocks. The positioning component controls the movement of the screen by adjusting the size of the gap between the limit block and the guide block. When the gap is zero or extremely small, the guide block and the limit block abut against each other, limiting the screen and causing it to vibrate synchronously with the screening box. When the gap increases, the screen can slide relative to the screen under the vibration of the screening box and periodically collide with the limit block during its ascent or descent.

[0027] The positioning component includes a cam 4 that corresponds one-to-one with the guide block 2. The cam 4 is eccentrically fixed to a support shaft 5. The support shaft 5 is rotatably connected to the screening box 6. The support shaft 5 is driven by a power mechanism that can drive it to rotate. The bottom end of the guide block 2 is supported on the outer circumferential surface of the cam 4. When the cam 4 is in the highest position, the top end of the guide block 2 abuts against the limit block 3. This is the first mode.

[0028] The positioning assembly adopts an eccentric cam structure, with the bottom of each guide block supported on the outer circumferential surface of a cam. The cam is eccentrically fixed to the support shaft, which is rotatably connected to the screening box and driven by a power mechanism. When the cam rotates to its highest position, its outer circumferential surface lifts the guide block, causing the top of the guide block to make close contact with the limiting block, restricting the vertical sliding of the screen. This creates a rigid connection between the screen and the screening box, achieving synchronous vibration screening in the first mode.

[0029] When cam 4 leaves its highest position, a movable gap 10 appears between the top of guide block 2 and limit block 3, allowing screen 1 to impact with the outer surfaces of limit block 3 and cam 4 within this gap. The rotational control of the eccentric cam structure enables rapid switching of the screen's limiting state. This structure is simple, responsive, and suitable for timed adjustment or automatic control. While ensuring stable screening, this structure provides a reliable structural basis for subsequent cleaning modes, enhancing the device's intelligence and operational flexibility, and reducing maintenance costs.

[0030] In one implementation, the power mechanism is a manually controlled handwheel. The state of the cam 4 is changed by rotating the handwheel. Preferably, multiple support shafts 5 are connected by transmission, so only one handwheel needs to be controlled.

[0031] The power mechanism includes a rotary motor 14, which is fixed to the ground. The power output shaft of the rotary motor 14 is fixedly connected to one of the support shafts 5 via a deformable transmission shaft 13. Multiple support shafts 5 are connected by a transmission mechanism. The power mechanism uses a rotary motor as the drive source. The motor is fixed to the ground, and its power output shaft is connected to a support shaft via a deformable transmission shaft, driving the support shaft to rotate. Multiple support shafts are connected by a linkage mechanism, enabling all eccentric cams to rotate synchronously, achieving unified lifting or releasing of multiple guide blocks. By controlling the start and stop of the rotary motor, the position of each cam can be precisely controlled, thereby switching the working mode of the screen.

[0032] Multiple support shafts 5 are connected by a drive system. For example, each support shaft 5 is equipped with a sprocket, and all sprockets are connected by a ring chain to form a closed-loop drive. The motor drives a main support shaft, and its sprocket drives the entire chain drive to achieve synchronous rotation of all support shafts; or each support shaft is equipped with a synchronous pulley, and the synchronous pulleys are connected by a synchronous belt.

[0033] The deformable drive shaft 13 can be a universal coupling or a rubber roller. A rotary motor drives an eccentric cam to adjust the screen's state. Since the screening box vibrates continuously during operation, directly mounting the motor on the screening box would potentially damage its structure and lifespan due to prolonged vibration. To avoid this problem, the rotary motor is fixed to the ground, and the power output shaft is connected to a support shaft mounted on the screening box via the deformable drive shaft, achieving flexible power transmission. The deformable drive shaft can be a universal coupling or a rubber roller, capable of adapting to the vibration and relative displacement of the screening box.

[0034] The rotary motor 14 is electrically connected to a controller, which can start the rotary motor 14 at regular intervals.

[0035] The rotary motor is electrically connected to a controller, which has a timer logic that automatically starts the rotary motor at preset time intervals. After the motor starts, it drives the support shaft and eccentric cam to rotate, thereby changing the limit state between the screen and the screening box, realizing the screen switching from synchronous vibration mode to a relatively sliding cleaning mode. After the cleaning process is completed, the controller can drive the motor to reset, and the screen returns to normal screening state, realizing automatic cycle control.

[0036] In one implementation method, the controller uses a programmable logic controller (PLC) as its core, with preset running time parameters for timed control of the rotary motor's start and stop. After the screening device has run continuously for the set time, the PLC automatically starts the rotary motor, driving the eccentric cam to rotate and putting the screen into cleaning mode. After cleaning lasts for several seconds, the PLC controls the motor to reset, and the screen returns to normal screening mode. This control method requires no manual intervention and allows for flexible adjustment of the cleaning frequency and time according to production needs, improving the automation and reliability of the screening process.

[0037] The screen 1 includes a frame 11 and a screen plate 12 that is detachably installed on the frame. The frame is directly or slidably connected to the screening box 6 via an intermediate component. The screen consists of a frame and a detachably installed screen plate, with the screen plate fixed to the frame, facilitating the replacement of different screen aperture sizes to meet the screening requirements of different particle sizes. The screen frame is installed inside the screening box via a sliding fit, and can be directly slidably connected to the screening box guide structure, or flexibly or guidedly connected via an intermediate component.

[0038] In one implementation method, under normal screening mode, the positioning component (including an eccentric cam structure) presses the screen against the limiting block. The screen vibrates synchronously with the screening box, thereby classifying the masterbatch by particle size and discharging it through the first and second discharge ports. During screening, the controller automatically starts the rotary motor according to a set time interval, driving the cam to rotate to the release position, creating a gap between the screen and the limiting block. The screen slides relative to the limiting block during vibration and collides with the positioning component, shaking off residual particles adhering to the mesh, thus achieving the screen's self-cleaning function. After cleaning, the controller drives the motor to reset, restoring the screen to its limit position, achieving continuous, automatic, and efficient cyclic screening operation.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technical solution, concept, or design obtained by those skilled in the art by making equivalent substitutions or changes based on the technical solution and utility model concept disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A masterbatch grading and screening device, comprising a screening box (6), a vibrating motor (7) capable of driving the screening box (6) to vibrate up and down, a screen (1) located inside the screening box (6), a first discharge port (8) for discharging material, and a second discharge port (9), characterized in that, The screen (1) is slidably connected to the screening box (6) in the upper and lower parts. A positioning component is provided between the screen (1) and the screening box (6). In the first mode, the positioning component can make the screen (1) and the screening box (6) vibrate synchronously. In the second mode, the screen (1) can slide up and down in the screening box (6) and the screen (1) can collide with the positioning component.

2. A master batch fractionating screening device according to claim 1, characterized in that, The screen (1) is fixedly connected to the surrounding area with guide blocks (2). The screen (1) slides with the screening box (6) through the guide blocks (2). The screening box (6) is fixedly connected to a limiting block (3) above the guide block (2). The positioning component can change the size of the movable gap (10) between the limiting block (3) and the guide block (2).

3. A master batch fractionating screening device according to claim 2, characterized in that, The positioning component includes a cam (4) corresponding to the guide block (2) one by one. The cam (4) is eccentrically fixed to a support shaft (5). The support shaft (5) is rotatably connected to the screening box (6). The support shaft (5) is driven by a power mechanism that can drive it to rotate. The bottom end of the guide block (2) is supported on the outer circumferential surface of the cam (4). When the cam (4) is in the highest position, the top end of the guide block (2) abuts against the limiting block (3). This is the first mode.

4. A master batch fractionating screening device according to claim 3, characterized in that, The power mechanism is a manually controlled handwheel.

5. A master batch fractionating device according to claim 3, wherein The power mechanism includes a rotary motor (14), which is fixed to the ground. The power output shaft of the rotary motor (14) is fixed to one of the support shafts (5) through a deformable transmission shaft (13), and multiple support shafts (5) are connected by transmission.

6. A master batch fractionating device according to claim 5, wherein The deformable drive shaft (13) is a universal coupling or a rubber roller.

7. A master batch fractionating device according to claim 5, wherein The rotary motor (14) is electrically connected to a controller, which is capable of starting the rotary motor (14) at regular intervals.

8. A master batch fractionating device according to any one of claims 1 to 7, characterized in that The screen (1) includes a frame (11) and a screen plate (12) that is detachably installed with the frame. The frame is slidably connected to the screening box (6) directly or through an intermediate component.

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