Two-dimensional positive chord vibration excitation device and vibration platform

Abstract

The invention relates to the technical field of vibration machinery, and provides a two-dimensional positive chord and vertical vibration excitation device and a vibration platform, the two-dimensional positive chord and vertical vibration excitation device comprises a base and a motor, two main shafts are rotatably arranged on the base in parallel, a motor shaft of the motor is parallel to the main shafts, eccentric blocks are arranged at the two ends of each main shaft respectively, and the eccentric blocks are arranged on the base. Gears are arranged in the middle of the main shaft, and the two gears are meshed with each other; wherein the two ends of one main shaft are in transmission connection with motor shafts at the two ends of the motor, and the rotating directions of the two main shafts are opposite; the motor and the main shaft are arranged in a split mode, so that the motor does not need to bear alternating centrifugal force and bending moment brought by an eccentric block when the main shaft rotates, and the service life of the motor is effectively prolonged. The two spindles are symmetrically arranged in parallel, and the layout mode of the eccentric blocks is changed, so that the vibration efficiency of the device is improved, vertical vibration excitation and shimmy excitation are realized, and the requirements of diversified selections of vibration directions and vibration modes can be met.

Description

Technical Field

[0001] The present application belongs to the field of vibration machinery technology, and more specifically, to a two-dimensional positive-harmonic vertical vibration excitation device. Background Art

[0002] Vibration platform, also known as vibration compaction table (also called vibration compaction table), is mainly used for vibrating (compacting) materials to reduce air and gaps in the materials. The vibration platform is mainly composed of four parts: bracket, table, vibration mechanism, and shock absorption mechanism. According to the type of vibration mechanism, the vibration platform can be divided into electromagnetic, mechanical, hydraulic drive / pneumatic, etc. Among them, the use of vibration motor as the vibration mechanism is the most common. The working principle is: the vibration platform generates centrifugal force through the vibration motor, which is converted into mechanical vibration and transmitted to the material through the table to achieve the vibration compaction effect. Vibration platforms are widely used in metallurgy, molds, food, chemicals, building materials and other industries to convert granular and powdery materials from bulk to block and other forms.

[0003] Vibration motors are currently a standard structure that is easy to install and use, so many vibration tables use them directly as vibrator drive platforms. Figure 1 As shown: the vibration motor a is fixed on a mounting base b, and an eccentric block d is installed at each end of the motor shaft c of the vibration motor. The centrifugal force generated by the high-speed rotation of the motor shaft and the eccentric block is used to obtain the exciting force. It integrates the motor and the eccentric block together, can effectively convert electrical energy into vibration force, and plays an important role in various vibration equipment.

[0004] However, it also has some disadvantages: one problem is that fatigue damage shortens the life of the vibration motor. During the operation of the vibration motor, the main shaft and bearing components not only bear torque, but also alternating centrifugal force and bending moment, which can easily induce fatigue damage to the generator main shaft. The motor bearing components also face the same problem. Another problem is the low effective vibration utilization rate of the vibration device. The vibration we want is often excitation in a certain direction rather than 360-degree excitation. During the circular motion of the vibrator, the vibration force circulates 360 degrees in the direction. The non-directional exciting force will also do non-directional work (vibration displacement), and the power loss is large, the efficiency is low, and the lost power may even accelerate the damage of the equipment (such as damage caused by excessive sway of the vibrating screen). Summary of the invention

[0005] In view of the above-mentioned deficiencies of the existing vibration motors, the purpose of the embodiments of the present application is to provide a two-dimensional positive-harmonic vertical vibration excitation device.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in this application is: to provide a two-dimensional positive-harmonic vertical vibration excitation device, including: a base and a motor, two main shafts are arranged on the base for parallel rotation, the motor shaft of the motor is arranged parallel to the main shaft, and eccentric blocks are respectively provided at both ends of each main shaft, and a gear is provided in the middle of the main shaft, and the two gears are meshed; the two ends of one of the main shafts are transmission connected to the motor shafts at both ends of the motor, and the rotation directions of the two main shafts are opposite.

[0007] In one embodiment, each of the main shafts is rotatably arranged on the base via two bearing seats.

[0008] In one embodiment, slave synchronous pulleys are respectively provided at both ends of the main shaft transmission-connected to the motor, a main synchronous pulley is provided on the motor shaft, and the driving pulley and the slave synchronous pulley are connected via a synchronous belt transmission.

[0009] In one embodiment, the motor shaft is located on a symmetry plane between the two main shafts.

[0010] In one embodiment, the two eccentric masses on each of the main shafts are overlapped along the axial direction, and the two eccentric masses on the two main shafts can be directly above or directly below the same axial horizontal plane at the same time.

[0011] In one embodiment, the two eccentric masses on each of the main shafts are overlapped in the axial direction, and when the two eccentric masses on one main shaft are directly above the horizontal plane of the axis, the two eccentric masses on the other main shaft are directly below the horizontal plane of the axis.

[0012] In one embodiment, one eccentric block on each of the main shafts is directly above the horizontal plane of the axis, and the other eccentric block is directly below the horizontal plane of the axis.

[0013] Another object of the present application is to provide a vibration platform, including: a vibration platform base, a working platform, a buffer mechanism, and the two-dimensional sinusoidal vertical vibration excitation device as described above.

[0014] The beneficial effects of the two-dimensional positive-harmonic vertical vibration excitation device provided in the present application are: by separating the motor and the main shaft, the motor does not need to bear the alternating centrifugal force and bending moment caused by the eccentric block when the main shaft rotates, which effectively improves the service life of the motor; by arranging the two main shafts in parallel and symmetrically and changing the layout of the eccentric blocks on the two main shafts, the vibration efficiency of the device is improved, vertical vibration excitation and swing vibration excitation are realized, and the needs of diversified selection of vibration directions and vibration modes can be met, with significant technical innovation and practical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural schematic diagram of a conventional vibration motor in the prior art;

[0017] Figure 2 A schematic diagram of the main structure of a two-dimensional positive hysteresis vertical vibration excitation device provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of the side view structure of a two-dimensional positive vertical vibration excitation device provided in an embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of force analysis of a symmetrical eccentric block in an embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of the layout of the eccentric blocks for vertical vibration along the Y-axis in the embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of the layout of the eccentric block oscillating around the Z axis in the embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of the layout of the eccentric block oscillating around the X-axis in the embodiment of the present application;

[0023] Figure 8 This is a schematic diagram of the main structure of the vibration platform provided in an embodiment of the present application.

[0024] Among them, the reference numerals in the figure are:

[0025] 1. Base; 2. Motor; 21. Motor shaft; 3. Main shaft; 4. Eccentric block; 5. Gear; 6. Bearing seat; 7. Slave synchronous pulley; 8. Main synchronous pulley; 9. Synchronous belt; 10. Vibration table seat; 11. Working platform; 12. Buffer mechanism. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] like Figure 2 and Figure 3 As shown, a two-dimensional positive chord vertical vibration excitation device provided in an embodiment of the present application is now described. The two-dimensional positive chord vertical vibration excitation device comprises: a base 1 and a motor 2. Two main shafts 3 are arranged on the base 1 for parallel rotation. Each main shaft 3 is respectively arranged for rotation through two bearing seats 6. The motor 2 has two motor shafts 21 and the motor shaft 21 is arranged parallel to the main shaft 3. Specifically, the two main shafts 3 are arranged symmetrically and the connecting line of the two axes forms a horizontal plane. The symmetry plane between the two main shafts 3 is perpendicular to the horizontal plane. The two motor shafts 21 of the motor 2 are located on the symmetry plane between the two main shafts 3, so that the vibrations generated by the motor 2 itself can cancel each other out.

[0031] An eccentric block 4 is provided at both ends of each main shaft 3, and a gear 5 is provided in the middle of the main shaft 3. The two gears 5 on the two main shafts 3 are meshed, and the radius of the gear 5 is greater than the radius of the eccentric block 4, so as to ensure that the two main shafts 3 will not be interfered when rotating; the two ends of one of the main shafts 3 are transmission-connected with the motor shaft 21 at both ends of the motor 2, and when the motor 2 drives one of the main shafts 3 to rotate, the other main shaft 3 rotates synchronously through the two meshing gears 5, and because the two gears 5 are meshed, the rotation directions of the two main shafts 3 are opposite. Among them, the two ends of the main shaft 3 transmission-connected with the motor 2 are respectively provided with slave synchronous pulleys 7, and each motor shaft 21 is provided with a main synchronous pulley 8, and the main synchronous pulley 8 and the slave synchronous pulley 7 at the same end are transmission-connected through a synchronous belt 9.

[0032] In this embodiment, the motor 2 and the main shaft 3 are designed to be split, so that the motor 2 does not need to bear the alternating centrifugal force and bending moment of the motor caused by the eccentric block 4 when the main shaft 3 rotates, which effectively improves the service life of the motor 2. At the same time, by symmetrically arranging the two main shafts 3 and changing the layout of the eccentric blocks 2 on the two main shafts 2, invalid vibrations are eliminated, the vibration efficiency of the device is improved, and vertical vibration excitation and swing vibration excitation are achieved, which can meet the needs of diversified selection of vibration directions and vibration modes, and the technical innovation and practical effects are remarkable. In other embodiments, the gear 5 can also be set to an eccentric structure, such as through an opening or a weight block, so that the gear 5 also has the function of an eccentric block, which can enhance the eccentric excitation effect.

[0033] like Figure 4 As shown in the figure, according to the force analysis, F is the centripetal force of the eccentric block 4, F1 and F2 are respectively the vertical force and the horizontal force. During the reverse synchronous rotation of the two main shafts 3, F1 is always strengthened, and F2 is always offset. As a result, the vibration is always carried out along the Y axis, and there is no vibration along the X axis. From the energy point of view: the X-axis force is zero, and there is no yaw power loss. This is because the device of this embodiment is superior to conventional vibration motors (such as Figure 1 The fundamental reason for the high efficiency rate) is shown.

[0034] In this embodiment, the relative installation angles of the eccentric mass 4 on each main shaft 3 and the relative installation angles of the eccentric mass 4 of the two groups of main shafts 3 are different, which will eventually lead to different results. For example, the relative installation angle of the eccentric mass 4 in the vertical vibration mode is 0°; the relative installation angle of the eccentric mass 4 in the swing vibration mode is 180°. Figure 5-7 As shown, each mode of vertical vibration and shimmy vibration is described in detail.

[0035] like Figure 5 As shown, the device provided in this embodiment performs vertical vibration along the Y-axis. Specifically, the two eccentric masses 4 on each main shaft 3 are overlapped in the axial direction, and the two eccentric masses 4 on the two main shafts 3 have the same layout, that is, the eccentric masses 4 on the two main shafts 3 can be directly above or directly below the same axial horizontal plane at the same time.

[0036] When the two-dimensional positive vertical vibration excitation device is working, the two main shafts 3 rotate synchronously in opposite directions, and the exciting forces of the two groups of eccentric blocks 4 only strengthen each other in the vertical direction to reach the maximum, or the exciting force vector sum is the maximum; in the horizontal direction, the exciting forces of the two groups of eccentric blocks 4 cancel each other, or the exciting force vector sum is zero; in other directions, the horizontal components of the exciting forces of the two groups of eccentric blocks 4 cancel each other, and the vertical components strengthen each other; combined Figure 4As shown, based on the symmetrical arrangement and synchronous counter-rotation design of the eccentric block 4, during the operation of the device, the exciting force is always in an orderly and controllable offset and reinforcement process cycle, and the horizontal directions offset each other, the resultant force of the horizontal component of the exciting force is zero, and there is no lateral displacement power loss, so the device has the maximum and best efficiency characteristics.

[0037] like Figure 6 As shown, the device provided in this embodiment performs oscillation around the Z axis. Specifically, the two eccentric masses 4 on each main shaft 3 are overlapped in the axial direction, and when the two eccentric masses 4 on one main shaft 3 are directly above the horizontal plane of the axis, the two eccentric masses 4 on the other main shaft 3 are directly below the horizontal plane of the axis, that is, the eccentric masses on the two main shafts 3 are installed at a relative angle of 180°.

[0038] like Figure 7 As shown, the device provided in this embodiment performs oscillation around the X-axis. Specifically, one eccentric block 4 on each main shaft 3 is directly above the horizontal plane of the axis, and the other eccentric block 4 is directly below the horizontal plane of the axis, that is, the two eccentric blocks 4 on the same main shaft 3 are installed at a relative angle of 180°; the two eccentric blocks 4 on the two main shafts 3 are arranged in the same manner.

[0039] like Figure 8 As shown, another object of the present application is to provide a vibration platform, including: a vibration platform seat 10, a working platform 11, a buffer mechanism 12 and the two-dimensional sinusoidal vertical vibration excitation device as described above, the two-dimensional sinusoidal vertical vibration excitation device is fixed to the lower surface of the working platform 11, the working platform 11 is fixed to the vibration platform seat 10 through the buffer mechanism 12 and the support, the buffer mechanism 12 is an air spring, at least four of which are provided. Among them, the motor 2 is a variable frequency motor 2, and is controlled by a variable frequency controller, so that soft start and soft stop can be achieved and the vibration frequency can be adjusted.

[0040] In this embodiment, the two main shafts 3 and the two eccentric blocks 4 thereon constitute two independent vibrators, and the double vibrator structure is connected to the motor 2 through a synchronous belt 9, and the load force is borne by the bearing seat 6, which effectively ensures the service life of the motor 2; the two vibrators are synchronously rotated in opposite directions by two gears 5, and the layout of the two eccentric blocks 4 is changed according to actual requirements, which can realize two-dimensional sinusoidal vertical vibration and swing vibration, and the vibrator has the characteristic of low noise through synchronous belt transmission.

[0041] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A two-dimensional positive vertical vibration excitation device, characterized in that: include: A base (1) and a motor (2), wherein two main shafts (3) are arranged on the base (1) for parallel rotation, a motor shaft (21) of the motor (2) is arranged in parallel with the main shafts (3), an eccentric block (4) is arranged at both ends of each main shaft (3), a gear (5) is arranged in the middle of the main shaft (3), and two gears (5) are meshed; the two ends of one of the main shafts (3) are transmission-connected with the motor shaft (21) at both ends of the motor (2), and the two main shafts (3) rotate in opposite directions.

2. The two-dimensional positive hysteresis vertical vibration excitation device according to claim 1, characterized in that: Each of the main shafts (3) is rotatably arranged on the base (1) via two bearing seats (6).

3. The two-dimensional positive sine vertical vibration excitation device according to claim 2, characterized in that: The two ends of the main shaft (3) connected to the motor (2) are respectively provided with slave synchronous pulleys (7), the motor shaft (21) is provided with a main synchronous pulley (8), and the main synchronous pulley (8) and the slave synchronous pulley (7) are connected through a synchronous belt (9).

4. The two-dimensional positive sine vertical vibration excitation device according to claim 3, characterized in that: The motor shaft (21) is located on a symmetry plane between the two main shafts (3).

5. The two-dimensional positive vertical vibration excitation device according to any one of claims 1 to 4, characterized in that: The two eccentric blocks (4) on each of the main shafts (3) are arranged to overlap along the axial direction, and the two eccentric blocks (4) on the two main shafts (3) can be directly above or directly below the same axial horizontal plane at the same time.

6. The two-dimensional positive hysteresis vertical vibration excitation device according to any one of claims 1 to 4, characterized in that: The two eccentric blocks (4) on each of the main shafts (3) are arranged to overlap in the axial direction, and when the two eccentric blocks (4) on one of the main shafts (3) are directly above the horizontal plane of the axis, the two eccentric blocks (4) on the other main shaft (3) are directly below the horizontal plane of the axis.

7. The two-dimensional positive vertical vibration excitation device according to any one of claims 1 to 4, characterized in that: One eccentric block (4) on each of the main shafts (3) is located directly above the horizontal plane of the axis, and the other eccentric block (4) is located directly below the horizontal plane of the axis.

8. A vibration platform, characterized in that: include: A vibration table seat (10), a working platform (11), a buffer mechanism (12), and a two-dimensional sinusoidal vertical vibration excitation device as claimed in any one of claims 1 to 7.

Images