Conveying device working through modal shape change

Abstract

The invention discloses a conveying device working through modal shape change. The conveying device comprises a flat plate and a vibration exciter used for exciting the flat plate to vibrate. One end of the flat plate is connected with the vibration exciter, and the other end of the flat plate is a free end; the flat plate obliquely extends downwards towards the direction of the free end of the flat plate; the materials on the flat plate have potential energy for moving downwards and do not have initial speed; by exciting modes of different orders of the flat plate, the modal shape of the flat plate is changed, so that the position of a stagnation point on the flat plate is also changed, and segmented conveying of materials on the flat plate is achieved. According to the conveying device, the materials are conveyed through the change of the modal shape, the materials are conveyed in the moving direction of the stagnation points, the distance between the materials can be determined and adjusted through the positions of the stagnation points, the defect that the distance change of the materials conveyed by a traditional vibrating conveyor is uncertain can be overcome, and the conveying device is suitable for vibrating conveying of fine and light materials.

Description

Technical Field

[0001] The invention relates to the technical field of vibration conveying, and in particular to a conveying device that works by utilizing the change of modal vibration shape. Background Art

[0002] Vibrating conveyor is a continuous conveying machine that uses the vibration generated by the vibrator to vibrate the trough, so that the material in the trough slides or throws in a certain direction. Vibrating conveyor is suitable for conveying materials with particle sizes ranging from large ores to crop seeds. While transporting materials, it can also complete various process treatments such as screening, dehydration and cooling. It is suitable for assembly line operations and is widely used in building materials, chemical industry and other industries.

[0003] When conveying materials on a traditional vibrating conveyor, the movement of materials on the conveying plate (disc) is random, the spacing between materials is not consistent, and is constantly changing, making it difficult to maintain a constant distance. It is not suitable for vibrating conveying of fine and lightweight materials. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned problems and provide a conveying device that utilizes the change of modal vibration shape to realize the conveying of materials, so that the materials are transported in the direction of movement of the stationary point, and the spacing between the materials can be determined and adjusted by the position of the stationary point, which can make up for the defect of the traditional vibrating conveyor that the spacing of materials conveyed is unpredictable, and is suitable for vibrating conveying of fine and lightweight materials.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A conveying device that works by using modal vibration shape changes, comprising a flat plate and an exciter for exciting the flat plate to vibrate; one end of the flat plate is connected to the exciter, and the other end of the flat plate is a free end; the flat plate extends downwardly in an inclined manner toward its free end; the material on the flat plate has the potential energy to move downward and has no initial velocity; by exciting different orders of modes of the flat plate, the modal vibration shape of the flat plate changes, thereby changing the position of a stagnation point on the flat plate, and according to the characteristic that the material will stay in the area where the stagnation point is located during the vibration process, segmented conveying of the material on the flat plate is achieved.

[0007] The working principle of the above-mentioned conveying device using the change of modal vibration shape is:

[0008] The present invention is based on the modal theory of the system (conveyor device). By exciting the modes of different orders of the system and utilizing the changes in the modal vibration modes of the system, accurate segmented conveying of materials on the system can be achieved. The mode is the inherent and overall vibration characteristic of the system, which is affected by the material, structure, and constraints of the system. Since each different system has its own different-order modes, and each mode of a system has a corresponding modal vibration mode. Different modes can be generated for different systems by changing the material, structure or constraints. For a specific system, the specific-order modes of the system can be excited and their modal vibration modes can be changed through external excitation effects. The combination of the two can produce theoretically infinite modal vibration modes. The movement trajectory and speed of the material will change with the difference in the modal vibration mode and the change in the position of the stationary point. These modal vibration modes can be selected and optimized according to the production environment and conveying requirements. The effect of staged material conveying is achieved through the combined action of different modal vibration modes.

[0009] A preferred solution of the present invention, wherein the plate corresponds to a modal vibration shape under each order of mode; under the modal vibration shape of a specific order of mode, the plate has a vibration area and a static area; the static area is the static area where the stationary point is located. In the above structure, there is a point in the plate where the displacement always remains zero during the vibration process, which is called a stationary point. The plate does not participate in the vibration in the static area corresponding to the stationary point, or the vibration amplitude of the static area is zero under ideal conditions.

[0010] Preferably, the conveying method of the conveying device comprises the following steps:

[0011] S1. As the exciter is started, the plate is excited to a certain mode (referring to the previous mode), and the material in the vibration area begins to move under the action of vibration and gravity, and continuously moves from the vibration area to the static area where the stationary point is located, and the material stays in the static area;

[0012] S2, adjusting the vibration frequency of the exciter to excite the plate to another high-order mode (higher than the modal order in step S1), the modal vibration shape of the plate changes, and the plate is transformed from the static area of ​​the previous mode to the vibration area of ​​the next mode (that is, the static area where the material is located is transformed into the vibration area). In this process, the material originally in the static area is transformed into the material in the vibration area. The material begins to move under the combined action of gravity and vibration, and moves from the vibration area to the static area, completing the first stage of material transportation;

[0013] S3. Adjust the vibration frequency of the exciter and continue to excite the plate to a lower or higher order mode. The modal vibration type of the plate changes again, and the static area where the material is located will be transformed into a vibration area again. The material begins to move under the combined action of gravity and vibration, moving from the vibration area to the new static area, completing the next stage of material transportation. In the above method, since the plate has a horizontal downward angle, the material will not move in the direction of the exciter due to the vibration, but will continue to move forward toward the free end until it moves to the new static area, thereby completing the next stage of transportation.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The conveying device that utilizes the change of modal vibration shape in the present invention realizes the segmented conveying of materials by exciting the specific mode of the flat plate to generate the corresponding modal vibration shape.

[0016] 2. The conveying device of the present invention that utilizes the change of modal vibration mode utilizes the change of the modal vibration mode of the plate to realize the staged conveying of materials. Since the position of the stationary point under each modal vibration mode is determined, it can ensure that the distance between materials remains constant, which makes up for the defect of the traditional vibrating conveyor that the distance between materials conveyed changes unpredictably.

[0017] 3. In the conveying device of the present invention that utilizes the change of modal vibration mode, the spacing between materials can be determined and adjusted by the position of the stationary point. By exciting the modes of different orders of the plate and changing the position of the stationary point, the distance of material movement can be adjusted, and the long-distance or short-distance movement of the material can be achieved, achieving a more precise control effect.

[0018] 4. The conveying device of the present invention that utilizes the change of modal vibration type is suitable for vibrating and conveying fine and light materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a conveying device according to the present invention that works by utilizing the change of modal vibration shape.

[0020] Figure 2 It is a schematic diagram of the modal vibration shape of the plate in step S1 of the present invention when it is excited to a certain specific order mode.

[0021] Figure 3 It is a schematic diagram of the modal vibration shape of the plate in step S2 of the present invention when it is excited to another higher-order mode.

[0022] Figure 4 It is a schematic diagram of the modal vibration shape of the plate in step S3 of the present invention when it is excited to a lower-order mode.

[0023] Figure 5It is a schematic diagram of the modal vibration shape of the plate when it is excited to a higher-order mode in step S3 of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0025] Mode is the inherent, overall vibration characteristic of the system (the conveying device in this embodiment). The different modes possessed by the same system at different natural frequencies are called modes of different "orders". Each order mode of the system has a specific natural frequency (or natural frequency), damping ratio and modal vibration shape. The modal vibration shape reflects the form of the system's vibration at a specific natural frequency. Each natural frequency of the system has a corresponding modal vibration shape, which shows the relative displacement and phase of each part of the system during vibration. In the modal vibration shape of each order mode, there is a point in the system structure (the plate 1 in this embodiment) where the displacement always remains zero during the vibration process, which is called a "stationary point". At these points, the structural components (certain areas of the plate 1 in this embodiment) do not participate in the vibration, or their vibration amplitude is ideally zero. By analyzing the response of the system at a certain natural frequency through modal analysis, the modal vibration shape and the position of the stationary point of the system at that frequency can be predicted.

[0026] See also Figure 1 Based on the above characteristics, this embodiment discloses a conveying device that utilizes modal vibration shape changes to transport materials. The modal vibration shape of the conveying device can be changed by adjusting the vibration frequency of the conveying device, selecting different materials or changing the structure. For a specific conveying device, the position of the stagnation point of the conveying device can be changed by exciting a specific order of the mode of the conveying device with a specific frequency.

[0027] See also Figure 1 The conveying device includes a flat plate 1 and an exciter for exciting the flat plate to vibrate. An exciter action position 2 is provided at one end of the flat plate for connecting the exciter. The vibration generated by the exciter is transmitted to the flat plate 1 through the black area at the left end of the flat plate (exciter action position 2). The other end of the flat plate 1 is a free end; the flat plate 1 extends downwardly in an inclined manner toward its free end; the material on the flat plate 1 has the potential energy to move downward and has no initial velocity; by exciting different orders of modes of the flat plate 1, the modal vibration shape of the flat plate 1 changes, thereby changing the position of the stagnation point on the flat plate 1. According to the characteristic that the material will stay in the area where the stagnation point is located during the vibration process, the segmented conveying of the material on the flat plate 1 is realized.

[0028] See also Figure 1, the plate 1 corresponds to a modal vibration type under each order of mode; under the modal vibration type of a specific order of mode, the plate 1 has vibration areas 1-3, 1-4 and static areas 1-1, 1-2; the static areas 1-1, 1-2 are the static areas where the stagnation point is located. In the above structure, there is a point on the plate 1 where the displacement always remains zero during the vibration process, which is called a stagnation point. The plate 1 does not participate in the vibration in the static areas 1-1, 1-2 corresponding to the stagnation point, or the vibration amplitude of the static areas 1-1, 1-2 is zero under ideal conditions. During the conveying process, after the exciter is turned on and the specific order of mode of the plate 1 is excited, the material in the vibration area 1-3 will move rapidly toward the static area 1-1 where the stagnation point is located due to the action of vibration and gravity. Since the amplitude of the stagnation point is zero, the material will not continue to move after reaching the stagnation point, but will stay at the stagnation point, that is, stay in the static area 1-1.

[0029] See also Figure 2 , the material can be transported by changing the position of the stationary point. Specifically, the excitation frequency of the vibrator is adjusted to change the modal vibration shape of the plate 1, thereby changing the position of the stationary point on the plate 1, so that the stationary material at the original stationary point position starts to move again, and continues to move to the next stationary point under the action of vibration and gravity. In this way, the material can be moved in stages at different stationary points, thereby ensuring that the materials are spaced according to a certain rule.

[0030] See also Figure 1 , the black area represents the action position 2 of the vibrator, the black square cube represents the material, and the arrow represents the direction of material movement.

[0031] See also Figure 1-Figure 5 , the conveying method of the conveying device comprises the following steps:

[0032] S1. Install one end of the plate 1 on the exciter, and install the plate 1 at a slightly downward tilt angle θ, so that the material on the plate 1 has the potential energy to move downward and has no initial velocity. As the exciter is started, the plate 1 is excited to a certain order mode (referring to the previous order mode, also called the first order mode). The modal vibration shape of the plate 1 is as follows: Figure 2 As shown in the figure (the white areas marked with upper and lower arrows are vibration areas 1-3 and 1-4, and the gray areas are static areas 1-1 and 1-2 where the stagnation points are located), the static material originally in the vibration area 1-3 begins to move due to the action of vibration and gravity, and continuously moves from the vibration area 1-3 to the static area 1-1 where the stagnation point is located. After the material arrives at the static area 1-1, the material stays in the static area 1-1 because the amplitude of the area where the stagnation point is located is zero and there are vibration blocks of the vibration areas 1-3 and 1-4 on the left and right sides.

[0033] S2, adjust the vibration frequency of the exciter to excite the plate 1 to another higher-order mode (higher in order than the mode in step S1, i.e., higher in vibration frequency), and the modal vibration shape of the plate 1 changes. The modal vibration shape of the plate 1 is as follows: Figure 3 As shown, the switching of modes causes the plate 1 to transform from the static area 1-1 of the previous mode (the mode in step S1) to the vibration area 2-1 of the next mode (the mode in step S2). In this process, the material originally in the static area 1-1 (the static area of ​​step S1) is transformed into the material in the vibration area 2-1 (the vibration area of ​​step S2). Under the combined action of gravity and vibration, the material begins to move forward from the vibration area 2-1 to the static area 2-2 (the static area of ​​step S2), completing the first stage of material transportation; after the material advances to the static area 2-2, the material will stop moving again and stay in the static area 2-2. Because the amplitude of the area where the stationary point is located is zero and there are vibration barriers of the vibration areas 2-1 and 2-3 on the left and right sides, the material stays in the static area 2-2.

[0034] S3. At this time, there are two control methods to continue to control the material movement, among which, Figure 4 As shown, the first method is to adjust the vibration frequency of the exciter, continue to excite the plate 1 to a lower-order mode (lower than the modal order in step S2, that is, the vibration frequency becomes smaller), the modal vibration type of the plate 1 changes again, and the static area 2-2 where the material is located will be transformed into the vibration area 1-5 again. The material begins to move under the combined action of gravity and vibration, moving from the vibration area 1-5 to the new static area 1-2, completing the next stage of material transportation. In the above method, since the plate 1 has a horizontal downward angle, the material will not move in the direction of the exciter (also called the excitation source) due to the vibration, but will continue to move forward toward the free end (forward) until it moves to the new static area, thereby completing the next stage of transportation.

[0035] See also Figure 5, the second method is to adjust the vibration frequency of the exciter, continue to excite the plate 1 to a higher-order mode (compared to the higher-order mode in step S2, the vibration frequency is higher), the modal vibration shape of the plate 1 changes again, and the static area 2-2 where the material is located will be transformed into the vibration area 3-4 again. The material will also move forward under the combined action of gravity and vibration in this new vibration area 3-4, and move from the vibration area 3-4 to the next static area 3-3 to complete the next stage of material transportation. The difference between the above second method and the first method is that due to the change in the modal vibration shape of the plate 1 in a higher-order mode, the interval between the vibration area 3-4 and the static area 3-3 will become smaller, which means that the distance the material moves will be shorter. The method of using a higher-order modal vibration shape makes the distance of the material moving in stages shorter, and can achieve higher-precision mobile control, providing more accurate positioning and control for material transportation. Finally, the material reaches the target area through several higher-order modes.

[0036] See also Figure 2-Figure 5 In each mode of the plate, the static area and the vibration area are arranged alternately.

[0037] The conveying method of the conveying device can make the material reach the target area through several high-order modes with gradually increasing vibration frequencies; or it can make the material reach the target area by replacing low-order modes and high-order modes in sequence, that is, replacing low vibration frequencies and high vibration frequencies in sequence. By adjusting the vibration frequency of the exciter to change the modal vibration type of the plate 1, the material can be moved in stages to achieve the effect of segmented conveying.

[0038] The working principle of the above-mentioned conveying device using the change of modal vibration shape is:

[0039] The present invention is based on the modal theory of the system (conveyor device). By exciting the modes of different orders of the system and utilizing the changes in the modal vibration modes of the system, accurate segmented conveying of materials on the system can be achieved. The mode is the inherent and overall vibration characteristic of the system, which is affected by the material, structure, and constraints of the system. Since each different system has its own different-order modes, and each mode of a system has a corresponding modal vibration mode. Different modes can be generated for different systems by changing the material, structure or constraints. For a specific system, the specific-order modes of the system can be excited and their modal vibration modes can be changed through external excitation effects. The combination of the two can produce theoretically infinite modal vibration modes. The movement trajectory and speed of the material will change with the difference in the modal vibration mode and the change in the position of the stationary point. These modal vibration modes can be selected and optimized according to the production environment and conveying requirements. The effect of staged material conveying is achieved through the combined action of different modal vibration modes.

[0040] During the production process, the plate 1 (conveyor plate or conveyor disc) is installed at a certain inclination angle according to the size, mass or other parameters of the material, so that the material has the potential energy to move downward but does not have an initial velocity. When the exciter starts working, it excites a specific order mode of the plate 1, and the material begins to move due to vibration and gravity until it reaches a certain static area where the stagnation point is located. Next, the frequency of the exciter is adjusted to change the order of the mode, so that the static area at the previous moment becomes the vibrating area at the next moment, and the material can continue to be transported forward. By continuously switching the vibration frequency of the exciter, the plate 1 switches between different modal vibration modes, and the material continuously moves in the direction of the change of the stagnation point, so that continuous staged transportation can be achieved. And because the position of the stagnation point under each modal vibration mode is fixed, this movement method can also determine the distance between materials.

[0041] The conveying device of this embodiment, which works by using the change of modal vibration shape, utilizes its different modal vibration shape changes to make the material to be conveyed move in stages. The motion trajectory can be not only linear but also various other shapes, which can meet diverse conveying needs.

[0042] Compared with traditional vibrating conveyors, the conveying device proposed in this embodiment utilizes the change of modal vibration type to realize material transportation, realizes the staged transportation of materials following the moving direction of the stationary point, and the spacing between materials can be determined and adjusted by the position of the stationary point, which makes up for the defect of unpredictable spacing of materials transported by traditional vibrating conveyors.

[0043] When the conveying device is working, the flat plate 1 (conveyor plate or conveyor tray) needs to be installed at a slightly downward angle so that the material on the flat plate 1 (conveyor plate or conveyor tray) has the potential energy to move downward without displacement. When the exciter starts working, the material starts to move forward (i.e., toward the free end) due to the vibration and gravity, and moves along the predetermined trajectory due to the change of the modal vibration shape.

[0044] The conveying device can be pre-designed using computer modeling software, with the material and structural parameters of the conveying device set in advance. The vibration modal analysis of the conveying device can be performed using simulation software to analyze the behavioral characteristics of the conveying device under different vibration states. By analyzing the simulation results, the various modal orders of the conveying device and their corresponding modal vibration shapes can be identified, and the most appropriate modal order can be selected in a targeted manner based on actual needs for optimization or use.

[0045] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A conveying device that works by using modal vibration shape changes, characterized in that: The invention comprises a flat plate and an exciter for exciting the flat plate to vibrate; one end of the flat plate is connected to the exciter, and the other end of the flat plate is a free end; the flat plate extends downwardly in an inclined manner toward the free end; the material on the flat plate has the potential energy to move downward and has no initial velocity; by exciting the modes of different orders of the flat plate, the modal vibration shape of the flat plate changes, thereby changing the position of the stationary point on the flat plate, thereby realizing segmented transportation of the material on the flat plate.

2. A conveying device that works by using modal vibration shape changes according to claim 1, characterized in that: The plate has a corresponding modal vibration shape under each order of mode; under the vibration shape of a specific order of mode, the plate has a vibration area and a static area; the static area is the static area where the stationary point is located.

3. A conveying device that works by using modal vibration shape change according to claim 1, characterized in that: The conveying method of the conveying device comprises the following steps: S1. As the exciter is started, the plate is excited to a certain specific mode, and the material in the vibration area begins to move under the action of vibration and gravity, and continuously moves from the vibration area to the static area where the stationary point is located, and the material stays in the static area; S2. Adjust the vibration frequency of the exciter to excite the plate to another higher-order mode. The modal vibration shape of the plate changes. The plate is transformed from the static area of ​​the previous mode to the vibration area of ​​the next mode. In this process, the material originally in the static area is transformed into the material in the vibration area. The material begins to move under the combined action of gravity and vibration, and moves from the vibration area to the static area, completing the first stage of material transportation; S3. Adjust the vibration frequency of the exciter and continue to excite the plate to a lower or higher order mode. The modal vibration type of the plate changes again, and the static area where the material is located will be transformed into a vibration area again. The material begins to move under the combined action of gravity and vibration, moving from the vibration area to the new static area, completing the next stage of material transportation.

Images