Frequency-adjustable vibration excitation device

Abstract

The utility model discloses a frequency-adjustable vibration excitation device, which comprises a motor, wherein the side surface of the motor is externally connected with a junction box; the frequency converter is placed at the bottom of the long and thin signal tower body and is connected in series with the junction box through an electric lead; the eccentric rod is connected with a rotating shaft of the motor through a rotating shaft sleeve at one end, and the other end of the eccentric rod is detachably connected with a balancing weight; the lower end of the inner ring of the O-shaped connecting disc is detachably connected with the motor, and the outer ring of the O-shaped connecting disc is detachably connected with the long and thin signal tower body. According to the vibration excitation device for the long and thin signal tower, the defects that the frequency and the magnitude of the vibration excitation force of an existing vibration exciter are inconvenient to change are overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration exciters, and in particular relates to a frequency-adjustable vibration exciter. Background Art

[0002] With the increasing improvement and promotion of 5G communication technology, the construction of communication towers has intensified, and higher requirements have been placed on their structural reliability. In order to effectively enhance communication signals, the height of communication towers has been continuously increased, the structural stiffness has been reduced, and the natural frequency has been reduced. Under the action of wind loads, it is easier to produce significant wind vibration response, resulting in frequent accidents of communication tower structure damage under wind loads.

[0003] Slender signal towers are typical wind-sensitive structures. Wind load is one of the control loads of their structural design. Their wind effects have the characteristics of multiple load forms and multiple vibration response modes. Therefore, after obtaining the natural frequency of the structure, the corresponding vibration reduction device is designed to control the wind vibration of the slender signal tower. It is necessary to use an exciter to excite the resonance of the slender signal tower to test the natural frequency of the relevant signal tower. The existing vibration exciters on the market can be divided into inertial, electric, electromagnetic, electro-hydraulic, pneumatic and hydraulic types. Traditional exciters are devices attached to certain machines and equipment to generate excitation force. They are important components of mechanical vibration and can enable the excited object to obtain a certain form and size of vibration force, thereby conducting vibration tests on the object. However, they are prone to problems such as low excitation transmission efficiency during use.

[0004] In order to solve this problem, the application number is: 201620307415.8, a dual-motor variable exciting force vibrator is developed, which is connected to the transmission shaft through a key, and the static eccentric block and the dynamic eccentric block are connected by bolts to increase the transmission efficiency. However, the four sets of static eccentric blocks make the device structure complicated, inconvenient to install and troublesome to adjust the exciting force. At the same time, the dual motors increase the maintenance cost. Utility Model Content

[0005] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages to be described below.

[0006] In order to achieve these purposes and other advantages according to the utility model, a frequency-adjustable excitation device is provided, comprising:

[0007] The motor has an external terminal box on its side;

[0008] A frequency converter is placed at the bottom of the long and thin signal tower body and is connected in series with the junction box through an electrical conductor;

[0009] An eccentric rod, which is connected to the rotating shaft of the motor through a rotating sleeve at one end and is detachably connected to a counterweight at the other end;

[0010] The lower end of the inner ring of the O-shaped connecting disk can be detachably connected to the motor, and the outer ring of the O-shaped connecting disk can be detachably connected to the tower body of the long and slender signal tower.

[0011] Preferably, the motor is a vertical reduction motor.

[0012] Preferably, a frequency adjustment knob is installed on the frequency converter.

[0013] Preferably, the eccentric rod is an iron sheet, one end of which needs to be made into a ring shape.

[0014] Preferably, one end of the eccentric rod is provided with a plurality of bolt holes, and the counterweight is fixed to the one end of the eccentric rod through bolts and the bolt holes.

[0015] Preferably, the O-shaped connecting plate has an inner circle of bolt holes that can be detachably connected to the motor, and an outer circle of bolt holes that can be detachably connected to the long and slender signal tower body, and the motor is fixed to the top of the long and slender signal tower body.

[0016] The utility model at least has the following beneficial effects:

[0017] The specified voltage input is controlled by the frequency knob on the inverter to drive the motor speed, and the corresponding exciting force is obtained through the centrifugal force generated by the high-speed rotation of the eccentric rod and the counterweight. It has wide practicality and is easy to install and operate. Through a reasonable mechanical structure and electrical control system, remote control and automatic operation can be achieved, reducing manual intervention and maintenance costs, and realizing effective structural monitoring and maintenance.

[0018] The exciting force is obtained through the centrifugal force of the high-speed rotation of the eccentric rod, and the vibration can be directly transmitted to the signal tower structure. The structure is simple and the transmission efficiency is high, which effectively stimulates the vibration response of the structure.

[0019] The introduction of eccentric vibrators will promote technological innovation and development in the field of signal tower structure monitoring and maintenance, and promote the upgrading of related technologies and equipment.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0022] Figure 2 It is a connection diagram of the utility model and the long and thin signal tower body;

[0023] Figure 3 A three-dimensional diagram of the eccentric rod of the utility model

[0024] Figure 4 This is the overall structure front view of the utility model

[0025] Figure 5 This is a front view of the connection between the motor, eccentric rod and counterweight block of the utility model;

[0026] Figure 6 This is a circuit connection diagram of the motor and the junction box of the utility model;

[0027] In the figure: 1. Slender signal tower body; 2. O-type connecting plate; 3. Motor; 4. Junction box; 5. Eccentric rod; 6. Counterweight; 7. Bolt; 8. Bolt hole; 9. Frequency converter; 10. Frequency knob; 11. Electrical wire; 12. Bushing. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0029] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0030] It should be noted that in the description of the present invention, the orientation or position relationship indicated by the term is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does 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 cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present utility model, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "sleeved / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0032] In addition, in the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] The following is a detailed description of this experimental novelty with reference to the accompanying drawings:

[0034] Figure 1-6 A frequency-adjustable excitation device of the utility model is shown, comprising:

[0035] The motor 3 has a terminal box 4 connected to the side thereof;

[0036] The frequency converter 9 is placed at the bottom of the long and thin signal tower body 1 and is connected in series with the junction box 4 through an electrical conductor 11;

[0037] An eccentric rod 5, which is connected to the rotating shaft of the motor 9 via a rotating sleeve 12 at one end and is detachably connected to a counterweight 6 at the other end;

[0038] The lower end of the inner circle of the O-shaped connecting disk 2 is detachably connected to the motor 3 , and the outer circle of the O-shaped connecting disk 2 is detachably connected to the long and thin signal tower body 1 .

[0039] Working principle:

[0040] The input voltage and frequency are controlled by the frequency converter 9 placed at the bottom of the slender signal tower body 1. The voltage is transmitted to the motor 3 installed in the slender signal tower body 1 through the series electrical conductor 11, so that the motor 3 starts to work. The shaft of the motor 3 drives the eccentric rod 5 and the counterweight 6 connected by the rotating shaft 12 to rotate around the slender signal tower body 1. The centrifugal force is obtained by the high-speed rotation of the eccentric rod 5 and the counterweight 6, thereby generating a corresponding exciting force (a force that causes the vibrating body to vibrate). Further, the exciting force is transmitted to the slender signal tower body 1 through the O-type connecting disk 2, so that the slender signal tower body 1 is subjected to the exciting force to generate vibrations of the corresponding frequency, thereby completing the use of the exciter to excite the resonance of the slender signal tower, thereby testing the natural frequency of the relevant signal tower.

[0041] As in the above solution, the motor 3 is a vertical reduction motor.

[0042] Working principle:

[0043] The motor 3 shaft drives the eccentric rod 5 and the counterweight block 6 connected by the rotating sleeve 12 to rotate around the long and thin signal tower body 1;

[0044] The vertical reduction motor has low energy consumption, superior performance, strong environmental adaptability, can work continuously in harsh environments such as corrosion and humidity, has low vibration, low noise, wide speed spectrum, strong versatility and low maintenance cost.

[0045] As in the above solution, a frequency adjustment knob 10 is installed on the frequency converter 9 .

[0046] The input frequency of the reduction motor is precisely adjusted by the frequency knob 10 on the frequency converter 9 to control the rotation input of the motor 3, and then the eccentric rod 5 is connected to the counterweight block 6 to rotate together to generate an exciting force, so that the slender signal tower body 1 generates a specified vibration.

[0047] As in the above solution, the eccentric rod 5 is an iron sheet, one end of which needs to be made into a ring shape.

[0048] Working principle: The eccentric rod 5 is an eccentric vibration structure with a small starting torque. It is made of metal material to improve the accuracy of use. One end needs to be made into a ring shape so that it can be better connected and fixed to the rotating shaft of the motor 3.

[0049] As in the above solution, a plurality of bolt holes 8 are provided at one end of the eccentric rod 5 , and the counterweight 6 is fixed to one end of the eccentric rod 5 through bolts 7 and the bolt holes 8 .

[0050] Working principle: the counterweight block 6 is connected to one end of the eccentric rod 5 by a bolt 7. The size and mass of the counterweight block 6 can be adjusted according to the required size of the eccentric force. The bolt hole 8 can be opened as required. The counterweight block 6 is adjusted accordingly through the bolt holes 8 at different positions.

[0051] As in the above scheme, the O-shaped connecting plate 2 has an inner circle bolt hole that can be detachably connected to the motor 3 , and an outer circle bolt hole that can be detachably connected to the slender signal tower body 1 , and the motor 3 is fixed on the top of the slender signal tower body 1 .

[0052] Working principle:

[0053] The motor 3 , the eccentric rod 5 and the counterweight 6 generate corresponding exciting force, which is transmitted to the slender signal tower body 1 through the O-type connecting plate 2 .

[0054] This installation method has a simple structure, is easy to install and operate, has high transmission efficiency, and can customize different O-type connection plates 2 according to different signal tower body radii.

[0055] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A frequency-adjustable excitation device, characterized in that: include: The motor has an external terminal box on its side; A frequency converter is placed at the bottom of the long and thin signal tower body and is connected in series with the junction box through an electrical conductor; An eccentric rod, which is connected to the rotating shaft of the motor through a rotating sleeve at one end and is detachably connected to a counterweight at the other end; The lower end of the inner ring of the O-shaped connecting disk can be detachably connected to the motor, and the outer ring of the O-shaped connecting disk can be detachably connected to the tower body of the long and slender signal tower.

2. The frequency-adjustable excitation device according to claim 1, characterized in that: The motor is a vertical reduction motor.

3. The frequency-adjustable excitation device according to claim 1, characterized in that: A frequency adjustment knob is installed on the frequency converter.

4. The frequency-adjustable excitation device according to claim 1, characterized in that: The eccentric rod is an iron sheet, one end of which needs to be made into a ring shape.

5. The frequency-adjustable excitation device according to claim 1, characterized in that: One end of the eccentric rod is provided with a plurality of bolt holes, and the counterweight block is fixed to the one end of the eccentric rod through bolts and the bolt holes.

6. The frequency-adjustable excitation device according to claim 1, characterized in that: The O-shaped connecting plate has an inner circle bolt hole that can be detachably connected to the motor, and an outer circle bolt hole that can be detachably connected to the long and thin signal tower body, and the motor is fixed on the top of the long and thin signal tower body.

Images