Cement transfer silo discharge outlet anti-blocking and flow-aiding device

Abstract

This invention belongs to the field of bulk cement conveying equipment, and relates to a device for preventing blockage and aiding flow at the discharge port of a cement transfer silo. Discharge ports are evenly spaced on the side of the transfer silo, and a discharge hopper is connected to each discharge port. The device includes a horizontal axis vibrating motor and a vertical axis vibrating motor. A horizontally positioned horizontal axis vibrating motor and a vertically positioned vertical axis vibrating motor are respectively installed at the center of the left and right sides of the discharge hopper. The rotation axes of the horizontal and vertical axis vibrating motors are perpendicular to each other. Eccentric blocks are installed on both sides of the rotation axes of the horizontal and vertical axis vibrating motors. This device for preventing blockage and aiding flow at the discharge port of a cement transfer silo, by designing the two vibrating motors with mutually perpendicular axes, allows the bulk cement inside the discharge hopper to be subjected to omnidirectional forces during operation. This results in the weakest point of the caking structure being subjected to periodic vibration forces, achieving the purpose of quickly breaking up the caking.

Description

Technical Field

[0001] This invention belongs to the field of bulk cement conveying equipment, and relates to a flow aid device, particularly a flow aid device for preventing blockage at the discharge port of a cement transfer silo. Background Technology

[0002] Currently, bulk cement is mainly transported by waterway. Due to the loading and unloading schedule of cargo ships, it is impossible for cargo ships to connect with road transport vehicles in a timely manner. In order to solve this problem, it is necessary to establish transshipment warehouses in ports to temporarily store bulk cement.

[0003] Due to the uncertainty of delivery time, bulk cement may cause caking at the discharge port of the transfer warehouse due to its own weight, i.e., blockage of the discharge port.

[0004] Unlike most transshipment silos that have hoppers or bins at the bottom, bulk cement transshipment silos used in ports are often designed with multiple discharge ports to accommodate vehicles of varying heights. These discharge ports are located on the sides of the silo, rather than in the center of the bottom.

[0005] Current technologies for addressing blockages such as arching in silos primarily employ vibration methods to break up the blockages. These methods include manually or with pneumatic hammers striking the silo walls, installing vibratory motors on the side walls, and using air cannons on the side walls. However, these three methods cannot completely solve the caking problem for transfer silos like those in ports where the discharge outlet is located on the side wall. Summary of the Invention

[0006] The purpose of this invention is to provide a cement transfer silo discharge port anti-blocking and flow-aiding device with a scientific and reasonable structural design, good anti-blocking and flow-aiding effect, and easy implementation.

[0007] The technical problem solved by this invention is achieved through the following technical solution:

[0008] A cement transfer silo discharge port anti-blocking and flow-aiding device is provided, wherein discharge ports are evenly distributed on the side of the transfer silo, and discharge hoppers are connected at the discharge ports. The device is characterized by including a horizontal axis vibration motor and a vertical axis vibration motor. A horizontally arranged horizontal axis vibration motor and a vertically arranged vertical axis vibration motor are respectively installed at the center of the left and right sides of the discharge hopper. The rotation axes of the horizontal axis vibration motor and the vertical axis vibration motor are perpendicular to each other. Eccentric blocks are installed on both sides of the rotation axes of the horizontal axis vibration motor and the vertical axis vibration motor.

[0009] Moreover, both the horizontal axis vibration motor and the vertical axis vibration motor are two-pole AC induction motors with an excitation force of less than 1000 N and an amplitude of less than 1 mm at the discharge port.

[0010] Furthermore, the horizontal axis vibration motor and the vertical axis vibration motor rotate in the same direction with a 0-degree phase difference, or rotate in opposite directions with a 180-degree phase difference.

[0011] Furthermore, the discharge hopper comprises an inclined hopper wall, a horizontal hopper wall, and a vertical side wall. A horizontally extending horizontal hopper wall is provided on the lower transfer chamber of the discharge port, and an inclined hopper wall with a lower front and higher rear is provided on the upper part of the horizontal hopper wall. A vertical side wall is provided between the inclined hopper walls and the horizontal hopper wall on both sides of the discharge port. The horizontal axis vibration motor and the vertical axis vibration motor are installed on the vertical side wall.

[0012] Furthermore, it also includes a high-pressure air pipe, with an air inlet provided on the horizontal wall of the discharge hopper, and a high-pressure air pipe connected to the air inlet.

[0013] Furthermore, it also includes a horizontal discharge pipe, an inclined discharge pipe, and a valve. The horizontal discharge pipe is connected to the front of the discharge hopper, and the inclined discharge pipe is connected to the front of the horizontal discharge pipe through a valve. The upper end face of the inclined discharge pipe is lower than the upper end face of the horizontal discharge pipe.

[0014] The advantages and beneficial effects of this invention are as follows:

[0015] This cement transfer silo discharge port anti-blockage and flow-aiding device uses two vibrating motors with their axes perpendicular to each other. During operation, the loose cement inside the discharge hopper is subjected to forces from all directions, thereby subjecting the weakest point of the caking structure to periodic vibration forces, achieving the purpose of quickly breaking up the caking. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram illustrating the installation of a horizontal axis vibration motor and a vertical axis vibration motor on both sides of the discharge port according to the present invention.

[0018] Figure 3 The force analysis diagrams for the horizontal axis vibration motor and the vertical axis vibration motor of the present invention when they rotate in the same direction with a 0-degree phase difference (force analysis diagrams for four different rotation moments within one rotation cycle, (a) rotation angle 0 degrees; (b) rotation angle 90 degrees; (c) rotation angle 180 degrees; (d) rotation angle 270 degrees) are shown.

[0019] Figure 4 The force analysis diagrams for the horizontal axis vibration motor and the vertical axis vibration motor of the present invention when they rotate in opposite directions with a phase difference of 180 degrees are shown (force analysis diagrams for four different rotation moments within one rotation cycle, (a) rotation angle 0 degrees; (b) rotation angle 90 degrees; (c) rotation angle 180 degrees; (d) rotation angle 270 degrees).

[0020] Figure Labels

[0021] 1-Transfer bin, 2-Discharge hopper, 3-Vertical axis vibrating motor, 31-Eccentric block on vertical axis vibrating motor, 4-Horizontal axis vibrating motor, 41-Eccentric block on horizontal axis vibrating motor, 5-Horizontal discharge pipe, 6-Inclined discharge pipe, 7-Valve, 8-High pressure air pipe, 9-Eccentric block. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by those skilled in the art to which this invention pertains.

[0024] A cement transfer silo discharge port anti-clogging and flow-aiding device is provided, wherein discharge ports are evenly distributed on the side of the transfer silo 1, and discharge hoppers 2 are connected to the discharge ports. Its innovation lies in:

[0025] A horizontal discharge pipe 5 is connected to the front of the discharge hopper, and an inclined discharge pipe 6 is connected to the front of the horizontal discharge pipe via a valve 7. The upper end face of the inclined discharge pipe is lower than the upper end face of the horizontal discharge pipe.

[0026] It includes a horizontal axis vibration motor 4 and a vertical axis vibration motor 3. A horizontal axis vibration motor and a vertical axis vibration motor are respectively installed at the center of the left and right sides of the discharge hopper. The rotation axes of the horizontal axis vibration motor and the vertical axis vibration motor are perpendicular to each other. There is no forced motion relationship between the horizontal axis vibration motor and the vertical axis vibration motor. The two work by utilizing the principle of vibration synchronization.

[0027] like Figure 2 As shown, both ends of the rotating shafts of the horizontal axis vibration motor and the vertical axis vibration motor are equipped with eccentric blocks 9; the eccentric block 31 on the vertical axis vibration motor rotates around the coordinate axis z, generating a circumferential excitation force in the yoz plane; similarly, the eccentric block 41 on the horizontal axis vibration motor rotates around the coordinate axis y, generating a circumferential excitation force in the xoz plane; under the combined action of the two sets of eccentric blocks, the discharge hopper is subjected to excitation forces in the three directions of space x, y and z.

[0028] Since the horizontal axis vibration motor and the vertical axis vibration motor are installed on both sides of the discharge hopper, in addition to being subjected to the excitation forces in the three spatial directions of x, y and z, the discharge hopper is also subjected to torques around the x, y and z axes because these forces do not pass through the center of mass of the discharge hopper.

[0029] Based on the above force analysis, it can be seen that the anti-blocking and flow-aiding device adopts a structural arrangement of two vibrating motors with their axes perpendicular to each other. This allows the loose cement inside the discharge hopper to be subjected to forces from all directions, thereby subjecting the weakest point of the caking structure to periodic vibration forces, achieving the purpose of efficiently breaking the caking phenomenon.

[0030] While starting the horizontal and vertical axis vibrating motors, high-pressure air is introduced into the bottom of the discharge hopper through the high-pressure air pipe 8. The high-pressure air pipe is made of DN25 material. The high-pressure air can blow up the loose cement at the bottom of the discharge hopper, which can reduce flow resistance. At the same time, due to the introduction of high-pressure air under closed compaction conditions, it will also accelerate the breaking of the loose cement caking phenomenon.

[0031] In this embodiment, the discharge hopper is welded from steel plates and includes an inclined hopper wall, a horizontal hopper wall, and vertical side walls. A horizontally extending horizontal hopper wall is provided on the lower transfer chamber of the discharge port. An inclined hopper wall, which is lower in the front and higher in the back, is provided on the upper part of the horizontal hopper wall. Vertical side walls are provided between the inclined hopper walls and the horizontal hopper walls on both sides of the discharge port. The horizontal axis vibration motor and the vertical axis vibration motor are mounted on the vertical side walls. The vertical side walls are right-angled trapezoids, with the upper part being the inclined waist of the trapezoid, the lower part being the right-angle waist of the trapezoid, the side closer to the rotating chamber being the long side of the trapezoid, and the side closer to the horizontal discharge pipe being the short side of the trapezoid. The cross-section of the discharge end at the front end of the discharge hopper is square, and its side length is greater than the side length of the horizontal discharge pipe.

[0032] The side length of any wall in the discharge hopper is less than 1 meter. According to the strength requirements of the steel plate, this embodiment selects a steel plate with a thickness of 4 to 6 mm. In order to prevent fatigue damage of the steel plate of this thickness under alternating forces, it is necessary to control the amplitude of the discharge hopper to be less than 1 mm.

[0033] In this embodiment, both the horizontal axis vibration motor and the vertical axis vibration motor are two-pole AC induction motors with a vibration frequency close to 50 Hz. Based on the amplitude requirements, a vibration motor with an excitation force of 1 kN can be selected after calculation.

[0034] The above technical parameters, based on theoretical calculations, can ensure that the steel plate will not suffer fatigue or other damage, nor will the motor be overloaded.

[0035] Because the discharge hopper can generate an amplitude of less than 1 mm under the combined action of the horizontal axis vibration motor and the vertical axis vibration motor, and can achieve synchronous vibration between the horizontal axis vibration motor and the vertical axis vibration motor at this vibration level, it can be ensured that the force on the discharge hopper is an approximately simple harmonic periodic force.

[0036] According to the principles of mechanics, the eccentric blocks of horizontal and vertical axis vibrating motors will have two motion states under synchronous vibration: a 0-degree phase difference and a 180-degree phase difference. Because the phase difference is different, the discharge hopper will be subjected to different forms of excitation force.

[0037] like Figure 3 As shown, the motion state of the eccentric block of the horizontal axis vibrating motor and the eccentric block of the vertical axis vibrating motor at four moments with a 0-degree phase difference, as well as the force situation of the discharge hopper.

[0038] In this system, the center of mass of the hopper system and the centers of mass of the two vibrating motors are represented by solid dots; the equivalent center of mass of the eccentric block is represented by a solid square; the large arrow represents the direction of the resultant force, and the absence of a large arrow indicates that the system is not subject to external forces.

[0039] Figure 3 At time (a), since the two vibrating motors rotate in the same direction and the phase difference is 0 degrees, the resultant force generated by the two vibrating motors cancels out on the x-axis, and the discharge hopper is not subjected to external force. Figure 3 (b) At time, the force generated by the horizontal axis vibrating motor is on the positive z-axis, while the force generated by the vertical axis vibrating motor is on the positive y-axis. Therefore, the resultant force on the discharge hopper comes from the yoz plane and is in the first angular limit. Figure 3 At time (c), the resultant forces generated by the two vibrating motors cancel each other out along the x-axis, and the discharge hopper is not subjected to any external force. Figure 3 At time (d), the force generated by the horizontal axis vibrating motor is on the negative z-axis, while the force generated by the vertical axis vibrating motor is on the negative y-axis. Therefore, the resultant force on the discharge hopper comes from the yoz plane and is in the third angular limit.

[0040] Since each vibratory motor shaft has two eccentric blocks at both ends, their equivalent forces can be placed at the center of symmetry during force analysis. The solid blocks in the figure represent the position of the equivalent center of mass of the eccentric blocks at each moment. Among them, o1 is the center of symmetry of the eccentric block of the vertical axis vibratory motor, and o2 is the center of symmetry of the eccentric block of the horizontal axis vibratory motor. The initial positions of the eccentric blocks of the vertical axis vibratory motor and the horizontal axis vibratory motor are in the direction of the line connecting o1 and o2 and are close to the center of mass o of the discharge port.

[0041] exist Figure 3In the figure, the rotation direction of the eccentric blocks of the horizontal axis vibrating motor and the vertical axis vibrating motor is observed from the positive y-axis and the positive z-axis of the centroid o of the discharge hopper, respectively; the eccentric blocks of the horizontal axis vibrating motor and the vertical axis vibrating motor rotate clockwise.

[0042] according to Figure 3 In the force situation, the resultant force projection of the eccentric blocks of the horizontal axis vibrating motor and the vertical axis vibrating motor on the x-axis is 0. Thus, the eccentric block of the vertical axis vibrating motor has a component force on the y-axis, and the eccentric block of the horizontal axis vibrating motor has a component force on the z-axis. Under the action of the two component forces, the discharge hopper moves in a straight line with an angle of 45 degrees between the first and third quadrants in the yoz plane. Under the action of the resultant force in this direction, the discharge hopper can achieve rapid material discharge.

[0043] like Figure 4 As shown, the motion state of the eccentric block of the horizontal axis vibrating motor and the eccentric block of the vertical axis vibrating motor at four moments with a 180-degree phase difference, as well as the force situation of the discharge hopper.

[0044] Figure 4 At time (a), since the two vibrating motors rotate in opposite directions and have a phase difference of 180 degrees, the resultant force generated by the two vibrating motors is superimposed on the positive x-axis, and the discharge port is subjected to the resultant force on the positive x-axis. Figure 3 (b) At time, the force generated by the horizontal axis vibrating motor is on the positive z-axis, while the force generated by the vertical axis vibrating motor is on the positive y-axis. Therefore, the resultant force on the discharge hopper comes from the yoz plane and is in the first angular limit. Figure 3 At time (c), the resultant forces generated by the two vibrating motors are superimposed on the negative x-axis, and the discharge hopper is subjected to the resultant force on the negative x-axis. Figure 3 At time (d), the force generated by the horizontal axis vibrating motor is on the negative z-axis, while the force generated by the vertical axis vibrating motor is on the negative y-axis. Therefore, the resultant force on the discharge hopper comes from the yoz plane and is in the third angular limit.

[0045] Similarly, in the force analysis, the equivalent force of each eccentric block is placed on the center of symmetry. The solid square in the figure is used to represent the position of the equivalent center of mass of the eccentric block at each moment. The initial position of the eccentric block of the vertical axis vibration motor and the eccentric block of the horizontal axis vibration motor is in the direction of the line connecting o1 and o2 and close to the center of mass o of the discharge hopper.

[0046] exist Figure 4 In the figure, the rotation direction of the eccentric block of the vertical axis vibration motor and the eccentric block of the horizontal axis vibration motor are observed from the positive y-axis and the positive z-axis, respectively, at the origin o. The eccentric block of the vertical axis vibration motor rotates clockwise, and the eccentric block of the horizontal axis vibration motor rotates counterclockwise.

[0047] according to Figure 4In the force analysis, the eccentric blocks of the vertical axis vibrating motor and the horizontal axis vibrating motor have a combined force along the x-axis. The eccentric block of the vertical axis vibrating motor has a force component along the y-axis, and the eccentric block of the horizontal axis vibrating motor has a force component along the z-axis. Therefore, under the excitation force of the eccentric blocks of the vertical axis vibrating motor and the horizontal axis vibrating motor, the discharge hopper moves in a circular motion on a plane perpendicular to the yoz plane with an angle of 45 degrees. Under the combined force in this direction, the discharge hopper can achieve rapid material discharge.

[0048] This invention is in Figure 3 and Figure 4 The force analysis results for two motor rotation direction combinations are given respectively. Based on the actual working conditions, Figure 3 Under operating conditions, the resultant forces of the two vibratory motors cancel each other out in the x-axis direction, confining the force on the material to the yoz plane. This force is a linear force acting at a 45-degree angle between the first and third quadrants, a direction highly suitable for material flow. However, because there is no force in the x-direction, the material will not experience any force in that direction, making it difficult to break up caking. Therefore, Figure 3 This solution is more suitable for flow assistance solutions;

[0049] Figure 4 In this working condition, since forces act in all three directions (x, y, and z), the material is subjected to forces in all directions. Because the material is subjected to forces in all directions, even its weakest structures will be stressed, which can accelerate the breaking down of caking. However, since the force in the x-direction is not in the material discharge direction, it will interfere with the material flow. Figure 4 The proposed solution is more suitable for addressing blockages.

[0050] The specific motion mode used to achieve blockage removal and flow assistance depends on the working conditions. The two solutions of this invention can be achieved simply by changing the phase wire sequence of the motor, so the structure is simple and easy to use.

[0051] If the tank has not discharged material for an extended period, the first step is to use... Figure 4 The blockage was cleared using this method, and then... Figure 3 The flow is assisted by a certain method. If the material discharge is continuous, simply use... Figure 3 Way.

[0052] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A device for preventing blockage and aiding flow at the discharge port of a cement transfer silo, comprising discharge ports evenly spaced on the side of the transfer silo, and a discharge hopper connected to each discharge port, characterized in that: It includes a horizontal axis vibration motor and a vertical axis vibration motor. A horizontal axis vibration motor is installed horizontally and a vertical axis vibration motor is installed vertically at the center positions on the left and right sides of the discharge hopper, respectively. The rotation axes of the horizontal axis vibration motor and the vertical axis vibration motor are perpendicular to each other. An eccentric block is installed on both sides of the rotation axis of the horizontal axis vibration motor and the vertical axis vibration motor. The horizontal axis vibration motor and the vertical axis vibration motor rotate in the same direction with a 0-degree phase difference, or rotate in opposite directions with a 180-degree phase difference. The discharge hopper comprises an inclined hopper wall, a horizontal hopper wall, and vertical side walls. A horizontally extending horizontal hopper wall is provided on the lower transfer bin of the discharge port. An inclined hopper wall with a lower front and higher rear is provided on the upper part of the horizontal hopper wall. Vertical side walls are provided between the inclined hopper walls and the horizontal hopper wall on both sides of the discharge port. The horizontal axis vibration motor and the vertical axis vibration motor are installed on the vertical side walls. It also includes a high-pressure air pipe, with an air inlet on the horizontal wall of the discharge hopper, and a high-pressure air pipe connected to the air inlet.

2. The anti-blocking and flow-aiding device for the discharge port of a cement transfer silo according to claim 1, characterized in that: Both the horizontal and vertical axis vibration motors are two-pole AC induction motors with an excitation force of less than 1000 N and an amplitude of less than 1 mm at the discharge port.

3. The anti-blocking and flow-aiding device for the discharge port of a cement transfer silo according to claim 1, characterized in that: It also includes a horizontal discharge pipe, an inclined discharge pipe and a valve. The horizontal discharge pipe is connected to the front of the discharge hopper, and the inclined discharge pipe is connected to the front of the horizontal discharge pipe through the valve. The upper end face of the inclined discharge pipe is lower than the upper end face of the horizontal discharge pipe.

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