阅读说明：本技术 一种双联重力平衡式电磁振动台 (Duplex gravity balance type electromagnetic vibration table ) 是由 吴泽钦 储德韧 商照聪 许铤 顾聿成 张小沁 于 2021-07-28 设计创作，主要内容包括：本发明涉及一种双联重力平衡式电磁振动台,所述电磁振动台包括杠杆装置和振动装置,所述杠杆装置包括底座、中心承重轴、平衡杠杆、左承重轴、右承重轴、左样品台和右样品台,所述底座、中心承重轴和平衡杠杆自下而上依次设置,所述中心承重轴和平衡杠杆之间活动连接,所述左承重轴和右承重轴一左一右分别设于平衡杠杆的两端,所述左承重轴和右承重轴分别与平衡杠杆活动连接,所述中心承重轴、左承重轴和右承重轴相互平行,所述左样品台设置在左承重轴上,所述振动装置和右样品台自下而上依次设置在右承重轴上。与现有技术相比,本发明可增大振动台的负载量,增加测试动力电池数量,提高试验效率,减少电力使用。(The invention relates to a duplex gravity balance type electromagnetic vibration table which comprises a lever device and a vibration device, wherein the lever device comprises a base, a central bearing shaft, a balance lever, a left bearing shaft, a right bearing shaft, a left sample table and a right sample table, the base, the central bearing shaft and the balance lever are sequentially arranged from bottom to top, the central bearing shaft and the balance lever are movably connected, the left bearing shaft and the right bearing shaft are respectively arranged at the two ends of the balance lever from left to right, the left bearing shaft and the right bearing shaft are respectively and movably connected with the balance lever, the central bearing shaft, the left bearing shaft and the right bearing shaft are mutually parallel, the left sample table is arranged on the left bearing shaft, and the vibration device and the right sample table are sequentially arranged on the right bearing shaft from bottom to top. Compared with the prior art, the invention can increase the load capacity of the vibration table, increase the number of power batteries for testing, improve the testing efficiency and reduce the power consumption.)

1. The duplex gravity balance type electromagnetic vibration table is characterized by comprising a lever device and a vibration device (2), wherein the lever device comprises a base (17), a central bearing shaft (16), a balance lever (6), a left bearing shaft (10), a right bearing shaft (4), a left sample table (13) and a right sample table (1), the base (17), the central bearing shaft (16) and the balance lever (6) are sequentially arranged from bottom to top, the central bearing shaft (16) and the balance lever (6) are movably connected, the left bearing shaft (10) and the right bearing shaft (4) are respectively arranged at two ends of the balance lever (6) from left to right, the left bearing shaft (10) and the right bearing shaft (4) are respectively and movably connected with the balance lever (6), and the central bearing shaft (16), the left bearing shaft (10) and the right bearing shaft (4) are mutually parallel, the left sample table (13) is arranged on the left bearing shaft (10), and the vibrating device (2) and the right sample table (1) are sequentially arranged on the right bearing shaft (4) from bottom to top.

2. The duplex gravity balanced type electromagnetic vibration table according to claim 1, wherein the vibration device (2) comprises a vibration table body (20), an upper pole plate (28), a lower pole plate (29), a guide shaft (25), a central magnetic pole (24), a moving coil (21), a moving coil driving coil (23), an upper exciting coil (22) and a lower exciting coil (27),

the vibrating table body (20) is hollow and is provided with an accommodating cavity,

the upper polar plate (28) and the lower polar plate (29) are arranged in the containing cavity along the axial direction vertical to the vibrating table body (20), the upper polar plate (28) is clung to the top surface of the vibrating table body (20), the lower polar plate (29) is clung to the bottom surface of the vibrating table body (20),

the central magnetic pole (24) is positioned at the middle lower part of the containing cavity, the bottom of the central magnetic pole (24) is contacted with the lower pole plate (29),

the guide shaft (25) penetrates through the containing cavity along the axial direction of the vibrating table body (20), the guide shaft (25) is positioned in the middle of the containing cavity, the top of the guide shaft (25) upwards penetrates through the central magnetic pole (24) and the upper pole plate (28) in sequence and extends out of the vibrating table body (20), the bottom of the guide shaft (25) downwards penetrates through the lower pole plate (29) and is connected with the right bearing shaft (4),

the movable coil (21) is sleeved outside the central magnetic pole (24), the top of the movable coil (21) upwards penetrates through an upper polar plate (28) and extends out of the vibrating table body (20) to be connected with the right sample table (1), the bottom of the movable coil (21) is contacted with a lower polar plate (29), the movable coil driving coil (23) is arranged between the movable coil (21) and the central magnetic pole (24),

the upper excitation coil (22) and the lower excitation coil (27) are located in the containing cavity along the axial direction perpendicular to the vibrating table body (20) and are arranged around the moving coil (21), the upper excitation coil (22) is located above the moving coil driving coil (23) and is in contact with the upper pole plates (29) and (28), and the lower excitation coil (27) is located below the moving coil driving coil (23) and is in contact with the lower pole plate (29).

3. The dual gravity balanced electromagnetic vibration table according to claim 2, wherein said vibration device (2) further comprises a pair of inner guide means (26), said inner guide means (26) being disposed between the guide shaft (25) and the central magnetic pole (24).

4. The duplex gravity balanced electromagnetic vibration table according to claim 1, wherein the connection between the balance lever (6) and the central bearing shaft (16) is at the center of gravity of the balance lever (6);

the connecting part of the balance lever (6) and the central bearing shaft (16) is provided with a central bearing (14), the connecting part of the balance lever (6) and the left bearing shaft (10) is provided with a left bearing (7), and the connecting part of the balance lever (6) and the right bearing shaft (4) is provided with a right bearing (5).

5. The duplex gravity balanced electromagnetic vibration table according to claim 1, wherein the balancing lever (6) is provided with an extension rod (601) extending outwards along the axial direction of the balancing lever (6) at one side of the left bearing shaft (10), and the extension rod (601) is movably provided with a balancing weight (8).

6. The duplex gravity balanced electromagnetic vibration table according to claim 5, wherein a fastening device (9) is provided on the weight block (8).

7. The dual gravity balance type electromagnetic vibration table according to claim 5, wherein a dial (15) is provided at the center of the balance lever (6).

8. The duplex gravity balanced type electromagnetic vibration table according to claim 1, wherein both sides of the left sample table (13) are provided with limiting grooves (12), the cross section of each limiting groove (12) is concave, both sides of the left sample table (13) are provided with limiting lugs (1301) protruding outwards, and the limiting lugs (1301) are located in notches of the limiting grooves (12).

9. The duplex gravity balanced electromagnetic vibration table according to claim 1, wherein the table surfaces of the left sample table (13) and the right sample table (1) are parallel to the base (17);

the loading areas of the left sample table (13) and the right sample table (1) are equal, and the weights of the left sample table (13) and the right sample table (1) are consistent;

the balance lever (6) is made of rigid materials.

10. The duplex gravity balanced electromagnetic vibration table according to claim 1, further comprising a left outer guide mechanism (11) and a right outer guide mechanism (3), wherein the left outer guide mechanism (11) is disposed on two sides of the left bearing shaft (10), and the right outer guide mechanism (3) is disposed on two sides of the vibration device (2).

Technical Field

The invention relates to the field of a vibration table technology and battery test equipment, in particular to a duplex gravity balance type electromagnetic vibration table.

Background

The vibration table is a device for carrying out an environmental vibration simulation test, is often used in the fields of aerospace, aviation, vehicles, electronics, medical treatment, machinery and the like, tests the structural strength and reliability of a product in a vibration environment in the processes of transportation, installation and use, and verifies the adaptability and service life of the product in the vibration environment.

The principle of the electric vibration table is that alternating current is introduced into a coil in a constant magnetic field, at the moment, the coil interacts with the constant magnetic field to generate alternating force with the same frequency as the alternating current, and in practical situations, the alternating force is the driving force of the electric vibration table. At present, the conventional electric vibration table is mainly composed of the following components: the vibration table comprises a vibration table body, a central magnetic pole arranged at the center of the vibration table, a moving coil which is sleeved outside the central magnetic pole and can move up and down, a moving coil driving coil wound at the lower part of the moving coil, an upper exciting coil and a lower exciting coil which surround the outside of the moving coil driving coil and are used for generating a constant magnetic field, an upper polar plate and a lower polar plate which are respectively arranged above and below the upper exciting coil and the lower exciting coil, a guide shaft penetrating through the center of the central magnetic pole, an air spring connected with the guide shaft and a sample table top arranged at the upper part of the moving coil.

In practical situations, one moving coil of the electric vibration table only corresponds to one sample table surface, and a large amount of power can be consumed when the vibration table works. For example, lithium metal and lithium ion batteries and batteries must pass vibration tests to prove their safety in a vibrating environment during transportation, as specified in the united states 'recommendation-regulatory paradigm for dangerous freight transport' section 38.3. At present, along with the increasing demand of the market on electric automobiles, more and more power batteries are needed, and a large batch of power batteries can be used for vibration testing. This requires that the equipment for vibration testing can save energy, and can increase the number of test samples, improve testing efficiency, and thus reduce testing costs.

Chinese patent CN107449579B discloses a large-displacement electric vibration table, which comprises a table body, a moving coil arranged in the center of the table body and capable of moving up and down, a direct current excitation device, a suspension support piece, a flexible air bag for bearing and supporting the bottom of the moving coil, a moving coil support base, a guide shaft and a drive circuit; the movable coil consists of a framework and a driving coil, a circumferential movable coil rib plate is integrally arranged at the upper end of the framework and corresponds to the movable coil rib plate, and a plurality of ascending limiting wedge-shaped plates are fixedly arranged on the table body; the suspension supporting piece is a plurality of U-shaped elastic arms which are arranged around the moving coil and connected between the table body and the upper part of the moving coil; the excitation device mainly comprises a magnetic cylinder, an upper excitation coil, a lower excitation coil, an upper polar plate and a lower polar plate; the length of the guide shaft is 10-12mm longer than that of the existing guide shaft; the collision stroke of the wedge-shaped plate and the limiting edge of the moving coil rib plate is 10-12mm longer than the existing collision stroke; the extension length of the U-shaped elastic arm is 10-12mm longer than that of the existing U-shaped elastic arm. This patent suffers from the following disadvantages: (1) the increase of the vertical displacement of the vibration table can cause more electric quantity consumption, so that the vibration table can generate enough thrust to achieve the maximum displacement, especially when a power battery is tested, the power battery with generally higher mass can increase the load of a moving coil, and the vibration table can increase the input power to enable the power battery to carry out vibration test; (2) the air spring is used for bearing, and when the vibrating table works, the air spring can be continuously compressed and stretched along with the up-and-down vibration of the moving coil, so that the requirement on the material of the air spring is high, meanwhile, the elastic fatigue of the material can be easily caused, and the service life of the air spring is reduced; (3) due to the increase of input electric quantity, when the air spring is used for bearing, a large amount of heat is generated when the vibration table works, so that the requirement on the heat dissipation performance of the vibration table is high, and the cost is increased; (4) the shaking table that this patent was announced only possesses a vibration mesa, can't test simultaneously to multiple sample, and test efficiency is not high.

Chinese patent CN111693238A discloses a dual-output electric vibration table, including dual-output moving coil subassembly, magnetic circuit assembly and direction subassembly, dual-output moving coil subassembly includes first moving coil and second moving coil, magnetic circuit assembly sets up the periphery of dual-output moving coil subassembly, do dual-output moving coil subassembly provides magnetic field, the one end of direction subassembly with dual-output moving coil subassembly is connected, the other end with magnetic circuit assembly connects. The innovation point of this patent lies in that electronic shaking table has two movable coil mesa, can fix the test piece simultaneously and carry out vibration test. However, the patent has the following disadvantages: (1) the design of the table top with the double moving coils can increase the load capacity of the vibrating table, so that the vibrating table consumes more electric quantity; (2) only double-output vibration in the horizontal direction can be performed, and double-output vibration in the vertical direction cannot be performed; (3) due to the vibration in the horizontal direction, the moving coil can bear a vertically downward force under the action of gravity, the force is increased along with the increase of the mass of a load sample, and particularly, in the case of testing a sample with larger mass such as a power battery, the moving coil can additionally bear a larger friction force, and the failure rate of the moving coil is increased.

Disclosure of Invention

The invention aims to provide a duplex gravity balance type electromagnetic vibration table which is mainly used for vibration testing of power batteries in the lithium battery and electric automobile industries, mainly solves the problems that a large amount of electric power is consumed and the number of load-bearing samples is small when a traditional vibration table vibrates, can increase the load capacity of the vibration table, increase the number of power batteries to be tested, improve the test efficiency and reduce the use of electric power.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a pair of gravity balance formula electromagnetic vibration platform, electromagnetic vibration platform includes lever apparatus and vibrating device, lever apparatus includes base, central bearing axle, balanced lever, left bearing axle, right bearing axle, left sample platform and right sample platform, base, central bearing axle and balanced lever set gradually from bottom to top, swing joint between central bearing axle and the balanced lever, the both ends of balanced lever are located respectively to a left side bearing axle and a right side bearing axle left side right side, left side bearing axle and right bearing axle respectively with balanced lever swing joint, central bearing axle, left bearing axle and right bearing axle are parallel to each other, left side sample platform sets up on left bearing axle, vibrating device and right sample platform set gradually on right bearing axle from bottom to top. The balance lever is supported by a central load bearing shaft.

The base, the balance lever, the table surface of the left sample table and the table surface of the right sample table are all horizontal, and the electromagnetic vibration table is in a state of each component when in a balanced state.

The vibration device comprises a vibration table body, an upper polar plate, a lower polar plate, a guide shaft, a central magnetic pole, a moving coil driving coil, an upper magnet exciting coil and a lower magnet exciting coil,

the vibrating table body is hollow and is provided with an accommodating cavity,

the upper polar plate and the lower polar plate are arranged in the containing cavity along the axial direction vertical to the vibrating table body, the upper polar plate is clung to the top surface of the vibrating table body, the lower polar plate is clung to the bottom surface of the vibrating table body,

the central magnetic pole is positioned at the middle lower part of the containing cavity, the bottom of the central magnetic pole is contacted with the lower polar plate, the central magnetic pole provides a constant magnetic field,

the guide shaft penetrates through the containing cavity along the axial direction of the vibrating table body, the guide shaft is positioned in the middle of the containing cavity, the top of the guide shaft sequentially penetrates through the central magnetic pole and the upper polar plate upwards and extends out of the vibrating table body, the bottom of the guide shaft downwards penetrates through the lower polar plate and the right bearing shaft to be connected, the guide shaft plays a role in supporting the moving coil and transmitting the vibration of the moving coil,

the movable coil is sleeved outside the central magnetic pole, the top of the movable coil upwards penetrates through the upper polar plate and extends out of the vibration table body to be connected with the right sample table, the bottom of the movable coil is contacted with the lower polar plate, the movable coil driving coil is arranged between the movable coil and the central magnetic pole, when alternating current is introduced, the movable coil driving coil can generate a variable magnetic field with the same frequency,

go up excitation coil and lower excitation coil and lie in along the axial of the perpendicular to shaking table body and hold the intracavity to all encircle the movable coil setting, go up excitation coil and lie in the top of movable coil drive coil and contact with last polar plate, lower excitation coil lies in the below of movable coil drive coil and contacts with lower polar plate, and when letting in direct current, go up excitation coil and lower excitation coil can produce invariable magnetic field. The vibrating device drives the right sample platform and the right bearing shaft to vertically vibrate up and down.

The vibrating device further comprises a pair of inner guide mechanisms, the inner guide mechanisms are arranged between the guide shafts and the central magnetic poles, and the inner guide mechanisms filter the vibration in other directions so as to enable the coil to vibrate vertically and vertically all the time.

The connecting position of the balance lever and the central bearing shaft is the gravity center position of the balance lever.

The connecting part of the balance lever and the central bearing shaft is provided with a central bearing, the connecting part of the balance lever and the left bearing shaft is provided with a left bearing, and the connecting part of the balance lever and the right bearing shaft is provided with a right bearing. The bearing has small friction coefficient and strong bearing capacity, and can bear high-frequency back-and-forth rotation.

The balance lever is provided with an extension rod extending outwards along the axial direction of the balance lever on one side of the left bearing shaft, and a balancing weight is movably arranged on the extension rod. The balancing weight can be along extension rod left and right sides translation, can trim the balance lever through removing the balancing weight. The effect of balancing weight is, through adjusting the position of balancing weight on the extension rod of balance lever, adjusts the moment size of left sample platform side to make lever arrangement be in balanced state.

The counterweight block is provided with a fastening device which can be a wing-shaped screw, and when the screw is screwed, the screw can abut against the extension rod, so that the counterweight block is fixed. Through fastener, can fix the balancing weight on a certain position of extension rod. The fastening device has the function that when the counterweight block is positioned at a certain point of the extension rod to balance the lever device, the fastening device can fix the counterweight block at the point of the extension rod to keep the counterweight block at the position in a static or vibrating state.

And a dial is arranged at the center of the balance lever (also at the center of gravity of the balance lever). The balance state of the whole electromagnetic vibration table can be judged through the degree on the dial, namely whether the whole electromagnetic vibration table is parallel to the base or not. The dial is provided with a pointer and scales, one of the scales is an angle and is used for indicating an angle formed between the current balance lever and the base, and when the balance lever is parallel to the base, the angle is 0 degree; the other scale is a stroke which can indicate the up-down stroke of the vibration of the electromagnetic vibration table, and the relationship between the stroke scale and the angle scale is shown as the following formula:

h＝l·sinθ (I)

in the formula (I), h is the distance of the vertical movement of the left sample platform or the right sample platform perpendicular to the base, l is the length of a balance lever between the right bearing shaft and the left bearing shaft, and theta is an angle indicated on the dial.

The balance lever is made of rigid materials. The lever has a stable rigid structure, and cannot deform when the two ends of the lever perform high-frequency up-and-down alternating motion.

The two sides of the left sample table are both provided with limiting grooves, the cross sections of the limiting grooves are in a concave shape, the two sides of the left sample table are both provided with limiting lugs in an outwards protruding mode, and the limiting lugs are located in notches of the limiting grooves. The effect of spacing groove is that the restriction sample platform goes on exceeding the displacement of lever apparatus stroke, and concrete accommodation process is: when the left sample platform and the right sample platform are unbalanced due to different weights of the power batteries, the sample platform can ascend or descend, when the sample platform ascends or descends to a certain displacement, the limiting groove resists the limiting lug of the left sample platform to prevent the left sample platform from moving, so that the right sample platform can be prevented from moving, the electromagnetic vibration platform is finally in a static state, and the limiting stroke of the notch in the limiting groove is greater than the vibration stroke of the electromagnetic vibration platform.

The table surfaces of the left sample table and the right sample table are parallel to the base. When the device works, the device is generally placed on a horizontal plane, and the left sample table, the right sample table and the base are all horizontal.

The loading areas of the left sample table and the right sample table are equal, and the weights of the left sample table and the right sample table are consistent.

The electromagnetic vibration table further comprises a left outer guide mechanism and a right outer guide mechanism, the left outer guide mechanism is arranged on two sides of the left bearing shaft, and the right outer guide mechanism is arranged on two sides of the vibration device. The left outer guide mechanism filters vibration in other directions to enable the left bearing shaft to always perform vibration motion vertical to the base, and the right outer guide mechanism filters vibration in other directions to enable the right bearing shaft and the vibration device to always perform vibration motion vertical to the base.

When the lever is in balance, the balance state can be broken by applying any external force to move the lever, so that when the duplex gravity balance type electromagnetic vibration table works, the movable coil does not need to generate a force for overcoming the weight of samples such as a power battery and the like, a sample table, the movable coil and the like to drive, and the vibration table can work by generating a smaller force. A constant magnetic field and a moving coil are arranged below the table board at one end of the lever, when an alternating current is introduced into the moving coil, the moving coil can vibrate up and down under the action of the constant magnetic field, at the moment, the balance state of the lever is broken through the oscillating force generated by the mutual influence of the magnetic field and the electrified coil, and the right sample table can vibrate up and down along with the moving coil. The sample platform of vertical vibration can drive the right bearing axle that links to each other with the balance lever and vibrate from top to bottom, through right bearing, center bearing and left bearing transmission vibration, can link the left sample platform of the balance lever other end, makes it carry out the up-and-down motion that the direction of motion is opposite but amplitude and vibration frequency are the same. The device utilizes lever principle, need not all to set up the movable coil at the sample platform bottom at both ends, only needs a movable coil, alright drive the sample platform simultaneous movement at both ends to, only need exert a very little power, alright break the balance of lever, even be the great sample of quality such as power battery, also enable it to vibrate. Therefore, compared with the traditional electric vibration table, the energy-saving electric vibration table can reduce alternating current introduced into the moving coil and current introduced into the excitation coil for generating a constant magnetic field, and achieves the purpose of energy conservation. The design of the double-vibration sample table can increase the number of the power batteries to be tested and carry out vertical vibration test on the power batteries.

The specific working principle of the device is as follows:

when the duplex gravity balanced type electromagnetic vibration table is in a balanced state, alternating current is introduced into a driving coil of a moving coil in the vibration device, and under the action of a constant magnetic field, the driving coil can generate alternating exciting force to drive the moving coil to perform vibration motion; meanwhile, the right sample table and the right bearing shaft connected with the top of the moving coil vibrate along with the sample table; through the transmission of right bearing, the vibration can be transmitted to balanced lever, afterwards, through the transmission of center bearing and left bearing again, the vibration can be transmitted to left sample platform through left bearing axle, makes it carry out with right sample platform frequency, amplitude the same, but the opposite vibration of direction of motion, when the lever was in the balance promptly, only need vibrating device to produce a less alternating force, can break the equilibrium state, makes lever apparatus begin to carry out the vibration motion.

When the device is used, the operation sequence is as follows:

(1) respectively fixing the samples on a left sample table and a right sample table;

(2) adjusting the balancing weight, balancing the balance lever, and fixing the balancing weight by using a fastening device when the pointer on the dial is in the central position;

(3) alternating current is introduced into the vibrating device to enable the vibrating table to start vibrating.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention utilizes the lever principle, when the lever device is in balance, an external force with any magnitude is required to be applied, the balance state can be broken, and the lever can move, so when the vibration table starts to work, the movable coil does not need to generate a force for overcoming the weight of samples such as a power battery and the like, a sample table, the movable coil and the like to drive, and only a small force is required to be generated, so that the movable coil can start to vibrate.

2. The invention utilizes the lever principle, when the vibration platform at one end of the balance lever moves, the vibration platform at the other end of the balance lever is driven to carry out vibration motion with the same frequency and amplitude but opposite motion direction. Two sample platforms vibrate simultaneously, can increase the load of shaking table, increase test power battery quantity, improve test efficiency.

3. The invention does not need the air spring in the traditional vibration table to bear the vibration table surface. In the vibration, the whole lever device is stably stressed, the air spring is not required to buffer when the moving coil vibrates, the vibration of the platform body is filtered, and the overhauling and maintenance cost of the device is reduced.

4. The invention does not use the air spring to bear the vibration table-board, and can not generate a large amount of heat due to compressed air in the vibration process, thereby saving energy, and needing no additional heat dissipation device to reduce the design cost.

Drawings

FIG. 1 is a schematic structural diagram of a duplex gravity balanced electromagnetic vibration table;

fig. 2 is a schematic sectional structure view of the vibration device.

In the figure: 1-right sample stage; 2-a vibration device; 20-vibrating table body; 21-moving coil; 22-upper field coil; 23-moving coil drive coil; 24-a central magnetic pole; 25-a guide shaft; 26-an inner guide mechanism; 27-lower field coil; 28-upper pole plate; 29-lower pole plate; 3-right outer guide mechanism; 4-right bearing shaft; 5-right bearing; 6-a balance lever; 601-an extension rod; 7-a left bearing; 8-a balancing weight; 9-a fastening device; 10-left load bearing shaft; 11-left outer guide mechanism; 12-a limiting groove; 13-left sample stage; 1301-limit ears; 14-a central bearing; 15-dial plate; 16-a central load bearing shaft; 17-base.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Examples

As shown in fig. 1, a duplex gravity balance type electromagnetic vibration table comprises a lever device and a vibration device 2, the lever device comprises a base 17, a central bearing shaft 16, a balance lever 6, a left bearing shaft 10, a right bearing shaft 4, a left sample table 13, a right sample table 1, a left outer guide mechanism 11 and a right outer guide mechanism 3, the base 17, the central bearing shaft 16 and the balance lever 6 are sequentially arranged from bottom to top, the central bearing shaft 16 is movably connected with the balance lever 6, the central bearing shaft 16, the base 17 and the balance lever 6 are vertically distributed, the joint of the balance lever 6 and the central bearing shaft 16 is the gravity center of the balance lever 6, a central bearing 14 is arranged at the joint of the balance lever 6 and the central bearing shaft 16, a dial 15 is arranged at the center of the balance lever 6, two scales are arranged on the dial 15, specifically, as described in the summary of the invention, the left bearing shaft 10 and the right bearing shaft 4 are respectively arranged at the two ends of the balance lever 6, a left bearing 7 is arranged at the joint of a balance lever 6 and a left bearing shaft 10 to realize movable connection, a right bearing 5 is arranged at the joint of the balance lever 6 and a right bearing shaft 4 to realize movable connection, a central bearing shaft 16, the left bearing shaft 10 and the right bearing shaft 4 are parallel to each other, a left sample table 13 is arranged on the left bearing shaft 10, an extension rod 601 is arranged on one side of the left bearing shaft 10 of the balance lever 6 and extends outwards along the axial direction of the balance lever 6, a balancing weight 8 is movably arranged on the extension rod 601, a fastening device 9 is arranged on the balancing weight 8 to fix the balancing weight 8 on the extension rod 601, limiting grooves 12 are arranged on both sides of the left sample table 13, the cross section of each limiting groove 12 is concave, a left outer guide mechanism 11 is arranged on both sides of the left bearing shaft 10, limiting lugs 1301 are arranged on both sides of the left sample table 13 outwards in a protruding manner, the limiting lugs 1301 are positioned in notches of the limiting grooves 12, the farthest up-down distance of the notches is larger than the vibration stroke of an electromagnetic vibration table, the vibrating device 2 and the right sample table 1 are sequentially arranged on the right bearing shaft 4 from bottom to top, the right outer guide mechanism 3 is arranged on two sides of the vibrating device 2, and the base 17, the balance lever 6, the table top of the left sample table 13 and the table top of the right sample table 1 are horizontal. The balance lever 6 is made of rigid materials, the table surfaces of the left sample table 13 and the right sample table 1 are parallel to the base 17, the loading areas of the left sample table 13 and the right sample table 1 are equal, the weights of the left sample table 13 and the right sample table 1 are consistent, and the left outer guide mechanism and the right outer guide mechanism are both rolling shafts.

As shown in fig. 2, the vibration device 2 includes a vibration table 20, an upper pole plate 28, a lower pole plate 29, a guide shaft 25, a central magnetic pole 24, a moving coil 21, a moving coil driving coil 23, an upper exciting coil 22, a lower exciting coil 27 and a pair of inner guide mechanisms 26, the vibration table 20 is hollow and is provided with a containing cavity, the upper pole plate 28 and the lower pole plate 29 are arranged in the containing cavity along an axial direction perpendicular to the vibration table 20, the upper pole plate 28 is tightly attached to the top surface of the vibration table 20, the lower pole plate 29 is tightly attached to the bottom surface of the vibration table 20, the central magnetic pole 24 is arranged at the middle lower part of the containing cavity, namely, between the upper pole plate 28 and the lower pole plate 29, the bottom of the central magnetic pole 24 is in contact with the lower pole plate 29, the guide shaft 25 is arranged to penetrate through the containing cavity along the axial direction of the vibration table 20, the guide shaft 25 is arranged at the middle part of the containing cavity, the top of the guide shaft 25 penetrates the central magnetic pole 24 and the upper pole plate 28 upwards and sequentially to extend out of the vibration table 20, the bottom of the guide shaft 25 penetrates through the lower pole plate 29 downwards to be connected with the right bearing shaft 4, the paired inner guide mechanisms 26 are arranged between the guide shaft 25 and the central magnetic pole 24, the moving coil 21 is sleeved outside the central magnetic pole 24, the top of the moving coil 21 penetrates through the upper pole plate 28 upwards to extend out of the vibrating table body 20 to be connected with the right sample table 1, the bottom of the moving coil 21 is in contact with the lower pole plate 29, the moving coil driving coil 23 is arranged between the moving coil 21 and the central magnetic pole 24, the upper excitation coil 22 and the lower excitation coil 27 are arranged in the accommodating cavity along the axial direction perpendicular to the vibrating table body 20 and all surround the moving coil 21, the upper excitation coil 22 is arranged above the moving coil driving coil 23 and is in contact with the upper pole plate 2928, and the lower excitation coil 27 is arranged below the moving coil driving coil 23 and is in contact with the lower pole plate 29. The inner guide mechanism adopts a rolling shaft, and two ends of the inner guide mechanism are respectively fixed on the front wall surface and the rear wall surface of the vibrating table body through connecting pieces such as bearings which do not influence the rotation of the rolling shaft.

The duplex gravity balance type electromagnetic vibration table of the embodiment further comprises a shell (omitted in the figure) arranged outside the lever device and the vibration device 2, two ends of the limiting groove are respectively connected to the front wall surface and the rear wall surface of the shell, and two ends of the left outer guide mechanism and the right outer guide mechanism are respectively fixed on the front wall surface and the rear wall surface of the shell through connecting pieces which are of bearings and do not influence the rotation of the rolling shaft

When the device is used for testing, a power battery (in the embodiment, the power battery is used as a description example) is used as a sample and is respectively fixed on the right sample table 1 and the left sample table 2, at this time, because the weights on two sides of the balance lever 6 are unbalanced (in the embodiment, the distances from the bearing shafts on two sides to the center of the balance lever are consistent, and because of the existence of the vibrating device, the force borne by the left bearing shaft is smaller than the force borne by the right bearing shaft, even if the total weights of the power batteries are consistent, the balance adjustment still needs to be performed in advance), the right sample table 1 and the left sample table 2 are not on the same horizontal line, and because of the existence of the limiting device 12, the limiting lug 1301 on the left sample table is propped against the limiting groove 12, so that the balance is in a static state. The balancing weight 8 is adjusted to enable the pointer on the dial 15 to point to the middle scale, the right sample table 1 and the left sample table 2 are located on the same horizontal line, and the whole electromagnetic vibration table is in a balanced state at the moment. Tightening the fastening device 9 fixes the weight 8 to the extension rod 601 of the balance lever 6, and at this time, the vibration test of the power battery is completed before the vibration test is completed, and then the vibration test is started. Alternating current is introduced into the vibration device 2, under the action of a constant magnetic field generated by the upper excitation coil 22, the lower excitation coil 23 and the central magnetic pole 24, the moving coil driving coil 23 generates an alternating surging force, the surging force is transmitted to the balance lever 6 through the right bearing shaft 4 and the right bearing 5, the balance state of the whole electromagnetic vibration table is broken, and the power batteries on the two sample tables are subjected to vibration motion with the same frequency and opposite phases. Two sample platforms vibrate simultaneously, can increase the load of shaking table, increase test power battery quantity, improve test efficiency.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.