A vibrating screen machine sieve plate weighing device and weighing method

Abstract

The present invention relates to the technical field of vibrating screen machines, and specifically to a vibrating screen machine sieve plate weighing device and weighing method. The weighing device includes a base and a vibrating screen machine. The vibrating screen machine has a plurality of stacked sieve plates. The base is provided with a plurality of rotating columns surrounding the vibrating screen machine. A weighing frame is provided between the rotating columns for the vibrating screen machine to pass through. The rotating columns can rotate around their own axes so that the weighing frame can move up and down along the rotating columns. The weighing frame is provided with a weighing cantilever surrounding the sieve plate, and the weighing cantilever can weigh the sieve plate by taking the sieve plate. This device adopts a method of taking all the sieve plates above from top to bottom in sequence, and calculates the weight of each layer of material through the weighing data taken twice before and after the material is screened. The present invention realizes the automation of vibrating screen machine weighing, which can significantly improve the weighing accuracy and efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of vibrating screen machines, and particularly relates to a sieve plate weighing device and a weighing method for a vibrating screen machine. Background Art

[0002] The process of classifying bulk materials into different particle sizes is called screening. Therefore, the equipment used to classify bulk materials by particle size is called a screening machine. Screening machines can be classified in various ways, depending on their purpose, screening principle, and structural form.

[0003] Multi-layer vibrating screens, often referred to as vibrating screens, are commonly used in engineering testing scenarios. These screens consist of several stacked sieve plates, with the apertures gradually decreasing from top to bottom. This means that the lower the sieve plates, the finer the material. While vibrating screens can precisely sieve bulk materials, screening quality is only one factor in ensuring accurate grading. Another factor in ensuring accurate grading is post-screening quality testing.

[0004] In the existing technology, after the material is screened, it is necessary to manually remove the sieve plates layer by layer and weigh the total weight of the sieve plates and the material. The material must then be poured out and the sieve plates weighed again to obtain the material weight. This method is extremely inefficient for a multi-stage vibrating screen, and repeated weighing of the multi-stage sieve plates will lead to accumulated errors and thus affect the final test accuracy. Summary of the Invention

[0005] The present invention provides a sieve plate weighing device for a vibrating screen, which solves the problem in the prior art that the vibrating screen cannot be weighed automatically and the problem that manual weighing is inefficient and has accumulated errors.

[0006] The technical solutions of the present invention are as follows:

[0007] A vibrating screen weighing device comprises a base and a vibrating screen placed on the base, the vibrating screen having a plurality of stacked sieve plates, the base being provided with a plurality of rotating columns surrounding the vibrating screen, a weighing frame being provided between the rotating columns for the vibrating screen to pass through, the rotating columns being rotatable around their own axes so that the weighing frame can move up and down along the rotating columns; the weighing frame being provided with a weighing cantilever surrounding the sieve plates, and the weighing cantilever being able to extend toward the center of the weighing frame or to retract in the opposite direction of extension so that the weighing cantilever has a first state in which it abuts against the sieve plates, and a second state in which it is separated from the sieve plates; when the weighing cantilever is in the first state, the weighing frame can drive the sieve plates to move up and down along the rotating columns under the rotation of the rotating columns.

[0008] Furthermore, the plane of the base is rectangular; the rotating column includes a first rotating column, a second rotating column and a third rotating column, the first rotating column and the second rotating column are respectively located at the two ends of one long side of the base, and the third rotating column is located at the center of the other long side.

[0009] Furthermore, an active synchronous pulley is provided under the base, and the active synchronous pulley is driven to rotate by a servo motor;

[0010] The lower ends of the first rotating column, the second rotating column and the third rotating column are all provided with driven synchronous pulleys, and the driven synchronous pulleys and the driving synchronous pulleys are connected in series through a synchronous belt, so that the synchronous pulleys can rotate together under the rotation of the driving synchronous pulley.

[0011] Furthermore, support columns are provided at both ends of the other long side of the base, and a top plate is provided on the top of the support columns, and the top plate is connected to the tops of the first rotating column, the second rotating column and the third rotating column.

[0012] Furthermore, the top plate is provided with a displacement sensor for monitoring the position of the weighing frame.

[0013] Furthermore, the weighing cantilever includes a cantilever sensor for weighing and a telescopic rod for telescoping, one end of the cantilever sensor is overlapped with the weighing frame, and the other end is suspended and faces the center of the weighing frame;

[0014] One end of the telescopic rod is connected to the other end of the cantilever sensor, and the other end of the telescopic rod is suspended in the air and faces the center of the weighing frame.

[0015] Furthermore, fixed columns are provided on both sides of the vibrating screen, and connecting plates that can move up and down along the fixed columns are provided between the fixed columns. A proximity switch is provided above the connecting plate, and the bottom of the connecting plate is connected to a pressure plate through a spring.

[0016] A weighing method for a vibrating screen weighing device, comprising the following steps:

[0017] Control the weighing cantilever to put it in the second state; drive the rotating column to rotate, control the weighing frame to move until the weighing cantilever and the middle section of the sieve plate to be weighed are located in the same horizontal plane; control the weighing cantilever to put it in the first state; drive the rotating column to rotate, control the weighing frame to move upward, and after the weighing frame is completely still, record the weighing data of the weighing cantilever; drive the rotating column to rotate, control the weighing frame to move downward, and wait for the sieve plate to be settled after weighing.

[0018] Before material screening, start from the top layer and weigh downwards according to the above steps until the bottom sieve plate is weighed. The absolute value of the difference between two adjacent weighing data is the dead weight of each layer of sieve plate.

[0019] After the material is screened, start from the top layer and weigh downwards according to the above steps until the bottom sieve plate is weighed. The absolute value of the difference between two adjacent weighing data is the total weight of each layer of sieve plate and the material in the sieve plate. The weight of the material in each layer of sieve plate can be obtained by calculating the difference between the total weight of each layer of sieve plate and the material in the sieve plate and the dead weight of the corresponding sieve plate.

[0020] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0021] 1. Compared with the traditional manual weighing method, the present invention realizes weighing automation. Automated weighing not only improves weighing efficiency, but also improves weighing accuracy. In terms of weighing efficiency, the device weighs the weight of the first layer, the first two layers, the first three layers...all layers from top to bottom in sequence. The mass of each layer can be easily calculated by the difference method. Compared with the method of taking the sieve plate and weighing it separately each time, automated weighing does not require the step of disassembling each layer of the sieve plate, and the weighing efficiency is significantly improved. In terms of weighing accuracy, the automated weighing method avoids the weighing error caused by the loss of material due to the vibration of the sieve plate when the weighing personnel repeatedly take the sieve plate. The total weight of the material after weighing using this weighing device is basically the same as the total weight when the material is added. In addition, the method of weighing a certain layer separately will lead to error accumulation due to the accuracy of the weighing equipment. When the number of layers is too large, this error is difficult to ignore and may lead to a decrease in weighing accuracy.

[0022] 2. The present invention achieves the up and down movement of the weighing frame through the rotation of three rotating columns. When the rotating columns rotate, the active and driven synchronous pulleys at the bottom rely on the synchronous belt to achieve joint rotation. Compared with the straight up and down movement method, the rotating columns can realize more precise movement of the weighing frame, which is more stable during movement and helps to reduce the vibration of the weighing cantilever. In this application, the three rotating columns are arranged at both ends of the long side of the base and in the middle of the other long side, forming an isosceles triangle. This also further improves the stability of the weighing frame during movement and is more suitable for cantilever weighing.

[0023] 3. The present invention provides fixed columns on both sides of the vibrating screen machine, and a connecting plate that can move up and down is installed on the fixed columns. A pressure plate is connected to the bottom of the connecting plate through a spring. The above method can prevent the sieve plate from falling during the vibration of the vibrating screen machine. When the pressure plate contacts the top sieve plate, the connecting plate no longer moves, and the fixing of the pressure plate is achieved by the compression of the spring. During the vibration of the vibrating screen machine, the pressure plate driven by the spring can vibrate with the vibrating screen machine, and the pressure plate can always keep the sieve plate closed to avoid material spillage and weighing errors. At the same time, the spring also has the function of buffering adsorption energy, which can prevent the mechanical vibration of the vibrating screen machine from being transmitted to the weighing frame and bending the weighing cantilever. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 A schematic diagram of the structure of a vibrating screen weighing device provided in this application;

[0026] Figure 2 This is a schematic diagram of the bottom structure of the base described in this application;

[0027] Figure 3 This is a schematic diagram of the structure of the weighing device of the vibrating screen machine not included in this application;

[0028] 1. Base; 1-1. Driving synchronous pulley; 1-2. Driven synchronous pulley; 1-3. Synchronous belt; 2. Vibrating screen; 3. Sieve plate; 4. Rotating column; 4-1. First rotating column; 4-2. Second rotating column; 4-3. Third rotating column; 5. Weighing frame; 6. Weighing cantilever; 6-1. Cantilever sensor; 6-2. Telescopic rod; 7. Support column; 8. Top plate; 8-1. Displacement sensor; 9. Fixed column; 9-1. Connecting plate; 9-2. Spring; 9-3. Pressure plate; 9-4. Proximity switch. DETAILED DESCRIPTION

[0029] As attached Figure 1 To the attached Figure 3As shown, a vibrating screen weighing device includes a base 1 and a vibrating screen 2 placed on the base 1, the vibrating screen 2 has a plurality of stacked sieve plates 3, the base 1 is provided with a plurality of rotating columns 4 surrounding the vibrating screen 2, a weighing frame 5 is provided between the rotating columns 4 for the vibrating screen 2 to pass through, the rotating columns 4 can rotate around their own axes so that the weighing frame 5 can move up and down along the rotating columns 4; the weighing frame 5 is provided with a weighing cantilever 6 surrounding the sieve plate 3, and the weighing cantilever 6 can extend toward the center of the weighing frame 5 or retract in the opposite direction of the extension direction, so that the weighing cantilever 6 has a first state of abutting against the sieve plate 3, and a second state of separation from the sieve plate 3; when the weighing cantilever 6 is in the first state, the weighing frame can drive the sieve plate 3 to move up and down along the rotating column 4 under the rotation of the rotating column 4.

[0030] As a preferred embodiment of the present application, the rotating column 4 is realized by a ball screw, and the weighing frame 5 can be moved up and down by installing a horizontal weighing frame 5 on the ball screw nut of the weighing frame 5.

[0031] In a specific embodiment of the above-mentioned embodiment, the rotating column 4 includes a first rotating column 4-1, a second rotating column 4-2 and a third rotating column 4-3. The first rotating column 4-1 and the second rotating column 4-2 are located at the two ends of the front side of the base 1, and the third rotating column 4-3 is located at the midpoint of the rear long side. The bottom of each rotating column is connected to a driven synchronous pulley 1-2. Synchronous pulleys are existing technology. In this embodiment, the driven synchronous pulley 1-2 does not have power. The power of the driven synchronous pulley 1-2 is provided by the active synchronous pulley 1-1, and the power is transmitted by the synchronous belt 1-3 wrapped around the outside. The active synchronous pulley 1-1 is arranged next to the driven synchronous pulley 1-2 connected to the third rotating column 4-3 and is powered by a servo motor.

[0032] As a preferred embodiment of the present application, support columns 7 are provided on symmetrical sides of the first rotating column 4-1 and the second rotating column 4-2 to ensure a stable frame structure for the entire weighing device. A top plate 8 is provided on top of the support columns 7, which is connected to the tops of the first rotating column 4-1, the second rotating column 4-2, and the third rotating column 4-3.

[0033] As a preferred embodiment of the present application, the top plate 8 is provided with a displacement sensor 8-1 for monitoring the position of the weighing frame. The displacement sensor 8-1 is fixed on the top plate 8 and controls the height of the weighing frame by monitoring the distance between the weighing frame and the displacement sensor 8-1, so that the sieve tray 3 can be taken out and put back at the corresponding position.

[0034] As a preferred embodiment of the present application, the weighing cantilever 6 includes a cantilever sensor 6-1 for weighing and a telescopic rod 6-2 for telescoping. Both the cantilever sensor 6-1 and the telescopic rod 6-2 are prior art. The cantilever sensor 6-1 can obtain the force on the cantilever and thus calculate the weight borne by the cantilever. In this embodiment, the rear end of the cantilever sensor 6-1 is overlapped with the weighing frame, and the front end is suspended and facing the center of the weighing frame; the rear end of the telescopic rod 6-2 is connected to the front end of the cantilever sensor 6-1, and the front end of the telescopic rod 6-2 is suspended and facing the center of the weighing frame.

[0035] In a preferred embodiment of the above embodiment, there are four weighing cantilevers 6 , which are respectively arranged along the diagonal lines of the rectangular weighing frame 5 .

[0036] As a preferred embodiment of the present application, the vibrating screen 2 is provided with fixed columns 9 on either side. Between the columns 9 is a connecting plate 9-1 that can move up and down along the columns 9. Above the connecting plate 9-1 is a proximity switch 9-4 that controls the distance between the connecting plate 9-1 and the pressure plate 9-3. The connecting plate 9-1 is connected to a pressure plate 9-3 below via a spring 9-2. This arrangement prevents the sieve plates 3 from falling during the vibrating process of the vibrating screen 2. When the pressure plate 9-3 contacts the topmost sieve plate 3, the connecting plate 9-1 stops moving, and the compression of the spring 9-2 secures the pressure plate 9-3. During the vibration of the vibrating screen 2, the spring 9-2 drives the pressure plate 9-3 to vibrate with the vibrating screen 2, keeping the pressure plate 9-3 sealed against the sieve plates 3, preventing material spillage and other weighing errors. The spring 9-2 also acts as a buffer, preventing mechanical vibrations from the vibrating screen 2 from being transmitted to the weighing frame and bending the weighing cantilever 6.

[0037] When implementing this method, the following steps are performed once before and after material screening.

[0038] Control the weighing cantilever 6 to be in the second state; drive the rotating column to rotate, control the weighing frame 5 to move until the weighing cantilever 6 and the middle section of the sieve plate 3 to be weighed are located in the same horizontal plane; control the weighing cantilever 6 to be in the first state; drive the rotating column to rotate, control the weighing frame 5 to move upward, and after the weighing frame 5 is completely stationary, record the weighing data of the weighing cantilever 6; drive the rotating column to rotate, control the weighing frame 5 to move downward, and wait for the sieve plate 3 to be weighed to fall steadily.

[0039] Before material screening, starting from the top layer, follow the above steps to weigh downwards until the bottom sieve plate 3 is weighed. The absolute value of the difference between two adjacent weighing data is the dead weight of each layer of sieve plate 3.

[0040] After the material is screened, start from the top layer and weigh downwards according to the above steps until the bottom sieve plate 3 is weighed. The absolute value of the difference between two adjacent weighing data is calculated as the total weight of each layer of sieve plate 3 and the material in the sieve plate 3. The weight of the material in each layer of sieve plate 3 is obtained by calculating the difference between the total weight of each layer of sieve plate 3 and the material in the sieve plate 3 and the dead weight of the corresponding sieve plate 3.

[0041] The above are merely preferred embodiments of the present invention. Anyone skilled in the art may utilize the above-described technical solutions to modify the present invention or modify them into equivalent technical solutions. Therefore, any simple modification or equivalent replacement based on the technical solutions of the present invention falls within the scope of protection claimed by the present invention.

Claims

1. A sieve plate weighing device for a vibrating screen, comprising a base (1) and a vibrating screen (2) placed on the base (1), wherein the vibrating screen (2) has a plurality of stacked sieve plates (3), characterized in that: The base (1) is provided with a plurality of rotating columns surrounding the vibrating screen (2); a weighing frame (5) is provided between the rotating columns for the vibrating screen (2) to pass through; the rotating columns (4) can rotate around their own axes so that the weighing frame (5) can move up and down along the rotating columns; the weighing frame (5) is provided with a weighing cantilever (6) surrounding the sieve plate (3); The weighing cantilever (6) can be extended toward the center of the weighing frame (5) or retracted in the opposite direction of the extension direction, so that the weighing cantilever (6) has a first state of abutting against the sieve plate (3) and a second state of being separated from the sieve plate (3); When the weighing cantilever (6) is in the first state, the weighing frame (5) can drive the sieve plate (3) to move up and down along the rotating column (4) under the rotation of the rotating column (4); The plane of the base (1) is rectangular; The rotating column (4) comprises a first rotating column (4-1), a second rotating column (4-2) and a third rotating column (4-3), wherein the first rotating column (4-1) and the second rotating column (4-2) are respectively located at the two ends of one long side of the base (1), and the third rotating column (4-3) is located at the center of the other long side; An active synchronous pulley (1-1) is provided below the base (1), and the active synchronous pulley (1-1) is driven to rotate by a servo motor; The lower ends of the first rotating column (4-1), the second rotating column (4-2) and the third rotating column (4-3) are all provided with driven synchronous pulleys (1-2), and the driven synchronous pulleys (1-2) and the driving synchronous pulleys (1-1) are connected in series via a synchronous belt (1-3), so that the synchronous pulleys can rotate together with the rotation of the driving synchronous pulley (1-1); The weighing cantilever (6) comprises a cantilever sensor (6-1) for weighing and a telescopic rod (6-2) for telescoping, one end of the cantilever sensor (6-1) being overlapped with the weighing frame (5), and the other end being suspended and facing the center of the weighing frame (5); One end of the telescopic rod (6-2) is connected to the other end of the cantilever sensor (6-1), and the other end of the telescopic rod (6-2) is suspended in the air and faces the center of the weighing frame (5).

2. A vibrating screen machine sieve plate weighing device according to claim 1, characterized in that: Support columns (7) are provided at both ends of the other long side of the base (1), and a top plate (8) is provided on the top of the support column (7), and the top plate (8) is connected to the tops of the first rotating column (4-1), the second rotating column (4-2), and the third rotating column (4-3).

3. A vibrating screen machine sieve plate weighing device according to claim 2, characterized in that: The top plate (8) is provided with a displacement sensor (8-1) for monitoring the position of the weighing frame (5).

4. A vibrating screen machine sieve plate weighing device according to claim 1, characterized in that: Fixed columns (9) are respectively provided on both sides of the vibrating screen machine (2), and a connecting plate (9-1) that can move up and down along the fixed columns (9) is provided between the fixed columns (9), a proximity switch (9-4) is provided above the connecting plate (9-1), and the bottom of the connecting plate (9-1) is connected to a pressure plate (9-3) through a spring (9-2).

5. A weighing method using the vibrating screen machine sieve plate weighing device according to claim 1, characterized in that: The following steps are involved: controlling the weighing cantilever to be in a second state; Drive the rotating column to rotate and control the weighing frame to move until the weighing cantilever and the middle section of the sieve plate to be weighed are on the same horizontal plane; controlling the weighing cantilever to be in a first state; Drive the rotating column to rotate, control the weighing frame to move upward, and record the weighing data of the weighing cantilever after the weighing frame is completely still; Drive the rotating column to rotate, control the weighing frame to move downward, and the sieve plate that has been weighed will fall down steadily; Before material screening, start from the top layer and weigh downwards according to the above steps until the bottom sieve plate is weighed. The absolute value of the difference between two adjacent weighing data is the dead weight of each layer of sieve plate. After the material is screened, start from the top layer and weigh downwards according to the above steps until the bottom sieve plate is weighed. The absolute value of the difference between two adjacent weighing data is the total weight of each layer of sieve plate and the material in the sieve plate. The weight of the material in each layer of sieve plate can be obtained by calculating the difference between the total weight of each layer of sieve plate and the material in the sieve plate and the dead weight of the corresponding sieve plate.

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