Vertical screw conveyor with weighing function and a quantitative sampling method

Abstract

The present application relates to a vertical screw feeder with weighing function and a quantitative sampling method, a weighing sensor is connected to a screw rod and a motor output shaft, the screw rod is weighed by the weighing sensor to realize real-time detection of the sampling amount, and the sampling amount can be controlled according to the detection result; the screw rod and the central shaft are separately arranged, and the lower end of the screw rod is arranged in the material taking cylinder and does not extend out of the material taking cylinder, so that the influence of the reaction force of the stirring paddle at the lower end of the central shaft on the bulk material on the weighing precision is eliminated, and the sampling amount detection precision is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of conveying and transferring, and particularly relates to a vertical screw extractor with a weighing function and a quantitative sampling method. BACKGROUND

[0002] At a bulk cargo terminal, all incoming bulk cargo materials (hereinafter referred to as bulk materials) need to be sampled and detected when being unloaded to determine the quality of the bulk materials. The traditional sampling inspection is manually sampled and then sent for inspection. However, with the development of automation, automatic sampling equipment has begun to appear, and the screw extractor is one kind of automatic sampling equipment.

[0003] However, the sampling equipment of the screw extractor does not have a weighing function, and the sampling amount is difficult to control, often resulting in problems of excessive or insufficient sample amount. Therefore, in order to improve the sampling accuracy, it is necessary to design a vertical screw extractor with a weighing function. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a vertical screw extractor with a weighing function to solve the technical problem of being difficult to accurately control the sampling amount when using the screw extractor to sample.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is: a vertical screw extractor with a weighing function, comprising a screw rod, a material taking cylinder sleeved outside the screw rod, and a driving motor fixedly connected to one end of the material taking cylinder for driving the screw rod to rotate, the screw rod comprises a hollow transmission pipe and a spiral blade spirally arranged on the outer wall of the transmission pipe, the lower end of the screw rod is flush with or higher than the lower end of the material taking cylinder, the output shaft of the driving motor is coaxially arranged with the transmission pipe and is connected to each other through a plurality of weighing sensors, a central shaft is coaxially connected in the transmission pipe, the lower end of the central shaft extends to the outside of the material taking cylinder and is fixedly connected to a plurality of circumferentially distributed stirring paddles, the upper end of the central shaft is in transmission connection with the output shaft, and any stirring paddle extends outwardly along the radial direction of the central shaft to the outside of the material taking cylinder.

[0006] As a preferred scheme, the top end of the transmission pipe is circumferentially distributed with a plurality of rectangular teeth, the lower end of the output shaft is provided with a plurality of rectangular grooves matched with the rectangular teeth, the rectangular teeth are one-to-one correspondingly and slidably inserted into the rectangular grooves, and the plurality of weighing sensors are circumferentially distributed on the outer wall of the transmission pipe, the upper end of the weighing sensor is fixedly connected to the outer wall of the output shaft, and the lower end of the weighing sensor is fixedly connected to the outer wall of the transmission pipe.

[0007] As a preferred solution, the top end of the transmission pipe is circumferentially provided with a plurality of isosceles trapezoidal teeth, the lower end of the output shaft is provided with a plurality of isosceles trapezoidal grooves matched with the isosceles trapezoidal teeth, the isosceles trapezoidal teeth are slidably inserted into the isosceles trapezoidal grooves one by one, the base angle of the isosceles trapezoidal teeth is arccos mu, mu is the friction coefficient between the slope of the isosceles trapezoidal teeth and the slope of the isosceles trapezoidal groove, and a plurality of weighing sensors are circumferentially arranged on the outer wall of the transmission pipe, the upper end of the weighing sensor is fixedly connected with the outer wall of the output shaft, and the lower end is fixedly connected with the outer wall of the transmission pipe.

[0008] As a preferred solution, the lower end of the central shaft is coaxially connected with a connecting seat, the connecting seat is composed of a frustum segment at the upper end and a cylindrical segment at the lower end, the outer diameter of the cylindrical segment is consistent with the outer diameter of the transmission pipe, and the top end diameter of the frustum segment is consistent with the diameter of the central shaft.

[0009] As a preferred solution, each stirring paddle is obliquely arranged, and the oblique direction of the stirring paddle is consistent with the oblique direction of the spiral blade.

[0010] The further technical problem solved by the present application is to provide a quantitative sampling method based on the vertical screw feeder, so as to solve the technical problem that it is difficult to accurately control the sampling amount when the screw feeder is used for sampling.

[0011] To solve the above technical problems, the technical scheme adopted by the present application is: a quantitative sampling method, comprising the following specific steps:

[0012] a. Installation: vertically arrange the vertical screw feeder, connect each weighing sensor and the driving motor with the controller, use the controller to receive the weighing result detected by the weighing sensor, control the action of the driving motor, connect the controller with the display to output the weighing data;

[0013] b. Calibration: first, record the weight reading M0 output by the controller in the no-load shutdown state, then start the driving motor of the vertical screw feeder in the no-load state, then insert the lower end of the vertical screw feeder into the bulk material to take material, stop the driving motor of the vertical screw feeder after taking a certain amount of material, record the weighing reading M1 output by the controller, lift the vertical screw feeder from the bulk material and transfer it to the material box, control the driving motor to reverse and unload, and after completing the unloading, weigh the unloaded bulk material to obtain the actual weight M2, and calculate the error rate P according to the formula P=M2 / (M1-M0).

[0014] c. Input the predetermined material weight M into the controller Y , start the driving motor of the vertical screw feeder, and then insert the lower end of the vertical screw feeder into the bulk material to take material, when the controller receives the weighing data M1=M0+(M YWhen the weight of the material in the material box reaches the predetermined sampling weight M, the controller controls the driving motor to stop, then lifts the vertical screw extractor from the bulk material and shifts it to the material box, and starts the driving motor again to make it reverse, so as to empty the bulk material in the vertical screw extractor, and the weight of the material in the material box is the predetermined sampling weight M Y .

[0015] The present application has the advantages that the weighing sensor is connected with the screw rod and the motor output shaft, the weighing sensor is used to weigh the material wound by the screw rod, the sampling amount is detected in real time, and the sampling amount can be controlled according to the detection result; the screw rod and the central shaft are arranged separately, and the lower end of the screw rod is arranged in the material taking cylinder and does not protrude from the material taking cylinder, so that the influence of the reaction force of the stirring paddle at the lower end of the central shaft on the bulk material on the weighing precision and the influence of the supporting effect of the bulk material on the screw rod on the weighing precision are eliminated, and the sampling amount detection precision is improved.

[0016] The present application further uses the cooperation of the rectangular slot and the rectangular tooth to realize the transmission between the output shaft and the screw rod, the vertical deformation of the weighing sensor is ensured to detect the sampling amount, the influence of the horizontal torsional deformation of the weighing sensor on the detection precision is eliminated, and the sampling amount detection precision is further improved.

[0017] The present application further uses the cooperation of the isosceles trapezoidal tooth and the isosceles trapezoidal slot to realize the transmission between the output shaft and the screw rod, the vertical deformation of the weighing sensor is ensured to detect the sampling amount, the influence of the horizontal torsional deformation of the weighing sensor on the detection precision is eliminated, and the sampling amount detection precision is further improved.

[0018] The present application further sets the connecting seat at the lower end of the central shaft to block the material from entering between the transmission pipe and the central shaft, so that the problem that the material clamped between the transmission pipe and the central shaft supports the transmission pipe and causes the detection precision of the weighing sensor to decrease is avoided.

[0019] The present application further inclines the stirring paddle to guide the bulk material into the material taking cylinder, and improves the material taking efficiency.

[0020] The present application calculates the error rate of the detection result and the actual sampling result by calibration, then calculates the theoretical detection result in combination with the error rate and the predetermined sampling amount, so as to ensure the consistency of the actual sampling amount and the predetermined sampling amount. BRIEF DESCRIPTION OF DRAWINGS

[0021] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings, in which:

[0022] Fig. 1 is a partial sectional view of the vertical screw material extractor according to the present application;

[0023] Fig. 2is a specific connection structure diagram of the transmission pipe and the output shaft;

[0024] Fig. 3 is another specific connection structure diagram of the transmission pipe and the output shaft;

[0025] Figs. 1-3 In: 1, screw rod, 1a, transmission pipe, 1b, spiral blade, 2, material taking cylinder, 3, driving motor, 3a, output shaft, 4, weighing sensor, 5, central shaft, 6, stirring paddle, 7, rectangular tooth, 8, rectangular groove, 9, isosceles trapezoidal tooth, 10, isosceles trapezoidal groove, 11, connecting seat, 11a, frustum section, 11b, cylindrical section, 12, controller, 13, display. DETAILED DESCRIPTION

[0026] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0027] Example 1;

[0028] As Figs. 1-3 shown in the vertical screw material taking device with weighing function, including screw rod 1, material taking cylinder 2 which is sleeved outside the screw rod 1, and driving motor 3 which is fixedly connected at one end of the material taking cylinder 2 for driving the screw rod 1 to rotate, the screw rod 1 includes hollow transmission pipe 1a and spiral blade 1b which is spirally arranged on the outer wall of the transmission pipe 1a, the lower end of the screw rod 1 is flush with the lower end of the material taking cylinder 2, the output shaft 3a of the driving motor 3 is coaxially arranged with the transmission pipe 1a and is connected with each other through four weighing sensors 4, a central shaft 5 is coaxially connected in the transmission pipe 1a, the lower end of the central shaft 5 extends to the outside of the material taking cylinder 2 through the transmission pipe 1a and is fixedly connected with a plurality of circumferentially distributed stirring paddles 6, the upper end of the central shaft 5 is drivingly connected with the output shaft 3a, any stirring paddle 6 extends outwardly to the outside of the material taking cylinder 2 along the radial direction of the central shaft 5, and the stirring paddle 6 can make the bulk material loose and tumble so as to be taken into the material taking cylinder 2 by the screw rod 1.

[0029] In actual application, the lower end of the screw rod 1 can also be slightly higher than the lower end of the material taking cylinder 2, as long as the bulk material can be taken.

[0030] In actual application, the four weighing sensors 4 are respectively connected with a controller 12, send detection signals to the controller 12, the controller 12 converts the detection signals into weighing data, and the controller 12 can be connected with a display 13 to output the weighing data for the operator to read.

[0031] As Fig. 2As described above, in this embodiment, the top end of the transmission tube 1a is uniformly distributed with a plurality of rectangular teeth 7, and the lower end of the output shaft 3a is provided with a plurality of rectangular slots 8 that mate with the rectangular teeth 7. The rectangular teeth 7 slide and insert into the rectangular slots 8 in a one-to-one correspondence. A plurality of load cells 4 are uniformly distributed around the outer wall of the transmission tube 1a, with the upper ends of the load cells 4 fixedly connected to the outer wall of the output shaft 3a and the lower ends fixedly connected to the outer wall of the transmission tube 1a. The coordination of the rectangular teeth 7 and the rectangular slots 8 allows the transmission tube 1a to move axially relative to the output shaft 3a but prevents relative twisting. This eliminates the problem of reduced detection accuracy caused by twisting of the load cells 4.

[0032] like Fig. 3 As shown, as another preferred embodiment, the top end of the transmission tube 1a in this embodiment is evenly distributed with a plurality of isosceles trapezoidal teeth 9 in the circumferential direction, and the lower end of the output shaft 3a is provided with a plurality of isosceles trapezoidal grooves 10 that cooperate with the isosceles trapezoidal teeth 9. The isosceles trapezoidal teeth 9 are slidably inserted into the isosceles trapezoidal grooves 10 one by one. The bottom angle of the isosceles trapezoidal teeth 9 is arccosμ, where μ is the friction coefficient between the inclined surface of the isosceles trapezoidal teeth 9 and the inclined surface of the isosceles trapezoidal grooves 10. A plurality of weighing sensors 4 are evenly distributed on the outer wall of the transmission tube 1a in the circumferential direction, and the upper end of the weighing sensor 4 is fixedly connected to the outer wall of the output shaft 3a, and the lower end is fixedly connected to the outer wall of the transmission tube 1a.

[0033] and Fig. 2 Compared with the connection structure of the transmission tube 1a and the output shaft 3a, Fig. 3 The connection structure shown reduces the influence of the friction between the screw rod 1 and the output shaft 3 on the weighing accuracy, further improving the sampling amount detection accuracy.

[0034] In this embodiment, a connector 11 is coaxially connected to the lower end of the central shaft 5. Connector 11 consists of a frustum-shaped section 11a at the upper end and a cylindrical section 11b at the lower end. The outer diameter of cylindrical section 11b matches that of transmission tube 1a, while the top diameter of frustum-shaped section 11a matches that of central shaft 5. Connector 11 blocks the lower end of transmission tube 1a, effectively preventing bulk material from entering between transmission tube 1a and central shaft 5. Agitator paddles 6 are connected to connector 11. Each agitator paddle 6 is tilted, aligning with the inclination of spiral blades 1b to guide bulk material into the reclaiming barrel and improve reclaiming efficiency.

[0035] Example 2:

[0036] The quantitative sampling method of the vertical spiral reclaimer based on the above-mentioned embodiment 1 includes the following specific steps:

[0037] a. Installation: Set the vertical screw reclaimer vertically, connect each weighing sensor 4 and the drive motor 3 to the controller 12 respectively, use the controller 12 to receive the weighing results detected by the weighing sensor 4 and control the operation of the drive motor 3, and connect the controller 12 to the display 13 to output the weighing data;

[0038] b. Calibration: First, record the weight reading M0 output by the controller 12 in the no-load stop state, then start the drive motor 3 of the vertical screw reclaimer in a no-load state, then insert the lower end of the vertical screw reclaimer into the bulk material to reclaim the material. After reclaiming a certain amount of material, stop the drive motor 3 of the vertical screw reclaimer, record the weighing reading M1 output by the controller 12, lift the vertical screw reclaimer from the bulk material and transfer it to the material box, control the drive motor to reverse and unload the material, and after unloading is completed, weigh the unloaded bulk material to obtain the actual weight M2. Calculate the error rate P according to the formula P=M2 / M1-M0;

[0039] c. Input the predetermined material weight M to the controller 12. Y , start the driving motor 3 of the vertical screw reclaimer, and then insert the lower end of the vertical screw reclaimer into the bulk material to take the material. When the controller 12 receives the weighing data M1= M0+M Y / P, the controller 12 controls the drive motor 3 to stop, then lifts the vertical screw reclaimer from the bulk material and transfers it to the material box, and restarts the drive motor 3 to reverse it, emptying all the bulk material in the vertical screw reclaimer. The weight of the material in the material box is the predetermined material weight M. Y .

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some embodiments of its application, and are not intended to limit the present invention. It should be noted that a person skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A vertical screw feeder with a weighing function, comprising a screw rod (1), a feeding barrel (2) sleeved on the outside of the screw rod (1), and a driving motor (3) fixedly connected to one end of the feeding barrel (2) for driving the screw rod (1) to rotate, characterized in that: The spiral rod (1) includes a hollow transmission tube (1a) and a spiral blade (1b) spirally arranged on the outer wall of the transmission tube (1a); the lower end of the spiral rod (1) is flush with or higher than the lower end of the material dispensing barrel (2); the output shaft (3a) of the drive motor (3) is coaxially arranged with the transmission tube (1a) and connected to each other through multiple weighing sensors (4); a central shaft (5) is coaxially connected inside the transmission tube (1a); the lower end of the central shaft (5) passes through the transmission tube (1a) and extends to the outside of the material dispensing barrel (2) and is fixedly connected to multiple circumferentially evenly distributed stirring paddles (6); the upper end of the central shaft (5) is transmission-connected to the output shaft (3a); any stirring paddle (6) extends radially outward along the central shaft (5) to the outside of the material dispensing barrel (2); The top end of the transmission tube (1a) is uniformly distributed with a plurality of rectangular teeth (7) in the circumferential direction, the lower end of the output shaft (3a) is provided with a plurality of rectangular grooves (8) that match the rectangular teeth (7), the rectangular teeth (7) are slidably inserted into the rectangular grooves (8) in a one-to-one correspondence, and a plurality of weighing sensors (4) are uniformly distributed on the outer wall of the transmission tube (1a) in the circumferential direction, the upper ends of the weighing sensors (4) are fixedly connected to the outer wall of the output shaft (3a), and the lower ends are fixedly connected to the outer wall of the transmission tube (1a); The top end of the transmission tube (1a) is uniformly distributed with a plurality of isosceles trapezoidal teeth (9) in the circumferential direction, and the lower end of the output shaft (3a) is provided with a plurality of isosceles trapezoidal grooves (10) that cooperate with the isosceles trapezoidal teeth (9). The isosceles trapezoidal teeth (9) are slidably inserted into the isosceles trapezoidal grooves (10) in a one-to-one corresponding manner. The bottom angle of the isosceles trapezoidal teeth (9) is arccosμ, where μ is the friction coefficient between the inclined surface of the isosceles trapezoidal teeth (9) and the inclined surface of the isosceles trapezoidal grooves (10). A plurality of weighing sensors (4) are uniformly distributed on the outer wall of the transmission tube (1a) in the circumferential direction, and the upper ends of the weighing sensors (4) are fixedly connected to the outer wall of the output shaft (3a), and the lower ends of the weighing sensors (4) are fixedly connected to the outer wall of the transmission tube (1a).

2. The vertical spiral reclaimer according to claim 1, characterized in that: The lower end of the central shaft (5) is coaxially connected to a connecting seat (11), and the connecting seat (11) is composed of a frustum section (11a) located at the upper end and a cylindrical section (11b) located at the lower end. The outer diameter of the cylindrical section (11b) is consistent with the outer diameter of the transmission tube (1a), and the top diameter of the frustum section (11a) is consistent with the diameter of the central shaft (5). The stirring paddle (6) is connected to the connecting seat (11).

3. The vertical spiral reclaimer according to claim 1, characterized in that: Each stirring paddle (6) is arranged at an angle, and the inclination direction of the stirring paddle (6) is consistent with the inclination direction of the spiral blade (1b).

4. The quantitative sampling method based on the vertical spiral material reclaimer according to claim 1, characterized in that: The specific steps include: a. Installation: The vertical screw reclaimer is set vertically, and each weighing sensor (4) and the drive motor (3) are connected to the controller (12) respectively. The controller (12) receives the weighing result detected by the weighing sensor (4) and controls the action of the drive motor (3). The controller (12) is connected to the display (13) to output the weighing data; b. Calibration: First, record the weight reading M0 output by the controller (12) in the no-load stop state, then start the drive motor (3) of the vertical screw reclaimer in the no-load state, then insert the lower end of the vertical screw reclaimer into the bulk material to take the material, stop the drive motor (3) of the vertical screw reclaimer after taking a certain amount of material, record the weighing reading M1 output by the controller (12), lift the vertical screw reclaimer from the bulk material and transfer it to the material box, control the drive motor to reverse and unload the material, weigh the unloaded bulk material after unloading to obtain the actual weight M2, and calculate the error rate P according to the formula P=M2 / (M1-M0); c. Input the predetermined material weight M into the controller (12) Y , start the driving motor (3) of the vertical screw feeder, and then insert the lower end of the vertical screw feeder into the bulk material to take the material. When the controller (12) receives the weighing data M1= M0+(M Y / P), the controller (12) controls the drive motor (3) to stop, then lifts the vertical screw feeder from the bulk material and transfers it to the material box, and starts the drive motor (3) again to reverse it, emptying all the bulk material in the vertical screw feeder. The weight of the material in the material box is the predetermined material weight M. Y .

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