阅读说明：本技术 一种安装在旋转转轴上的接地枪 (Install ground connection rifle in rotatory pivot ) 是由 黄彬 谢劲松 王敏 韩中喜 潘勇 陈志良 况休生 易昌国 于 2019-10-23 设计创作，主要内容包括：本发明公开了一种安装在旋转转轴上的接地枪,该接地枪与旋转转轴上的转向支座连接,包括第一撑板,在第一撑板一端的下方连接有与旋转转轴的机组大盖螺栓相连的紧固螺母,另一端连接有第二撑板,在第二撑板的上端连接有钢管,在钢管的管壁中间部位轴向开设贯穿的长条孔,在钢管内设置有弹簧,弹簧两端分别设有第一弹簧座和第二弹簧座,第二弹簧座的另一侧与石墨棒连接,在钢管外壁套接有能轴向滑动的调节套,在调节套开设有径向锁紧螺孔,在径向锁紧螺孔上连接有锁紧螺栓,在调节套外壁径向侧连接有定位螺母,在定位螺母上设有螺杆,螺杆端部与连接杆的一端连接,连接杆的另一端穿过长条孔后与第一弹簧座连接,在螺杆的尾端设有便于旋转的转轮。(The invention discloses a grounding gun installed on a rotating shaft, which is connected with a steering support on the rotating shaft, and comprises a first supporting plate, wherein a fastening nut connected with a machine set large cover bolt of the rotating shaft is connected below one end of the first supporting plate, the other end of the first supporting plate is connected with a second supporting plate, a steel pipe is connected at the upper end of the second supporting plate, a through long hole is axially arranged in the middle of the pipe wall of the steel pipe, a spring is arranged in the steel pipe, a first spring seat and a second spring seat are respectively arranged at two ends of the spring, the other side of the second spring seat is connected with a graphite rod, an adjusting sleeve capable of axially sliding is sleeved on the outer wall of the steel pipe, a radial locking screw hole is arranged on the adjusting sleeve, a locking bolt is connected on the radial locking screw hole, a positioning nut is connected on the radial side of the outer wall of the adjusting sleeve, a, the other end of the connecting rod penetrates through the long hole and then is connected with the first spring seat, and a rotating wheel convenient to rotate is arranged at the tail end of the screw rod.)

1. The utility model provides an install ground connection rifle in rotatory epaxial, this ground connection rifle is connected with rotatory epaxial turning support of commentaries on classics, its characterized in that: comprises a first supporting plate (1), a fastening nut (2) connected with a machine set large cover bolt of a rotary rotating shaft is connected below one end of the first supporting plate (1), the other end of the first supporting plate is connected with a second supporting plate (3), the upper end of the second supporting plate (3) is connected with a steel pipe (4), a through long hole (41) is axially arranged in the middle of the pipe wall of the steel pipe (4), a spring (5) is arranged in the steel pipe (4), a first spring seat (6) and a second spring seat (7) are respectively arranged at the two ends of the spring (5), the other side of the second spring seat (7) is connected with a graphite rod, an adjusting sleeve (10) capable of axially sliding is sleeved on the outer wall of the steel pipe (4), a radial locking screw hole is arranged on the adjusting sleeve (10), a first locking bolt (12) is connected on the radial locking screw hole, a positioning nut (14) is connected on the, the positioning nut is provided with a screw rod (9), the end part of the screw rod (9) is connected with one end of a connecting rod (15), the other end of the connecting rod (15) penetrates through the strip hole (41) and then is connected with the first spring seat (6), and the tail end of the screw rod (9) is provided with a rotating wheel (8) which is convenient to rotate.

2. The grounding gun mounted on a rotary spindle of claim 1, wherein: a graphite rod connecting sleeve (16) is arranged on the second spring seat (7) and at the side contacting with the graphite rod, and the graphite rod connecting sleeve (16) is sleeved with the graphite rod (11).

3. The grounding gun mounted on a rotary spindle of claim 2, wherein: the contact sides of the first spring seat (6) and the second spring seat (7) and the spring (5) are respectively provided with a connecting platform with a horn-shaped cross section, and one side of the connecting platform close to the side of the first spring seat (6) or the second spring seat (7) is a small opening.

4. The grounding gun mounted on a rotary spindle of claim 1, wherein: and a second locking screw hole is formed in the axial direction of the fastening nut (2), and a second locking bolt (21) is arranged on the second locking screw hole.

5. The grounding gun mounted on a rotary spindle of claim 1, wherein: the first spring seat (6) and the second spring seat (7) are connected with the inner wall of the steel pipe (4) in a sliding fit manner.

6. The grounding gun mounted on a rotary spindle of claim 1, wherein: the spring (5) is made of stainless steel materials, and the wire diameter, the outer diameter, the free length and the total number of turns of the spring (5) are respectively 1mm, 14mm, 175mm and 33N.

7. The grounding gun mounted on a rotary spindle of claim 1, wherein: the long holes (41) are 60mm long and 15mm wide.

8. The grounding gun mounted on a rotary spindle of claim 1, wherein: the first supporting plate (1) is provided with a transverse adjusting waist hole (101) which is positioned at the connecting part of the first supporting plate (1) and the second supporting plate (3).

9. The grounding gun mounted on a rotary spindle of claim 1, wherein: the second supporting plate (3) is provided with a longitudinal adjusting waist hole (301) which is positioned at the connecting part of the first supporting plate (1) and the second supporting plate (3).

10. a grounding gun mounted on a rotating shaft according to any of claims 1-8 wherein: a bending part (13) forming an angle of 30 degrees with the horizontal direction is arranged on the first supporting plate (1).

Technical Field

The invention relates to a grounding gun installed on a rotating shaft, and belongs to the technical field of induction electric grounding equipment of a rotating rotor.

Background

At present, some rotating mechanical devices using steam as driving power generate induced potential (voltage) on a rotating shaft when rotating due to their mechanical or electrical characteristics. If the voltage release system does not work properly or is not handled, the voltage will find an alternative path to ground and the corresponding metal body will become the ground conductor for the induced voltage. Very typically the bearings (bushings) or seals of the rotor, are susceptible to arcing, i.e. electrostatic discharge. These arcs can damage the metal skins and increase the normal running seal clearances between components, if not handled in time, the bearings (bushings) and seals can become progressively damaged, the dynamic characteristics of the rotor can be slowly altered, eventually damaging the rotor and causing expensive repairs. Therefore, a grounding brush is usually used to discharge the induced voltage, which helps to avoid this problem. However, the existing grounding electric brush has the problems of high cost, complex installation, short service cycle, high safety risk of online maintenance and replacement and the like, so that the normal operation of the existing grounding electric brush is influenced, a plurality of hidden dangers are buried for equipment, and the production and the burden are reduced.

Disclosure of Invention

In view of this, the technical problem to be solved by the present invention is to provide a grounding gun installed on a rotating shaft, which has low cost, simple structure, convenient operation, long operation period, on-line adjustment and replacement, and low failure rate, and can overcome the disadvantages of the prior art.

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

A grounding gun installed on a rotating shaft is connected with a steering support on the rotating shaft and comprises a first supporting plate, a fastening nut connected with a machine set large cover bolt of the rotating shaft is connected below one end of the first supporting plate, the other end of the first supporting plate is connected with a second supporting plate, a steel pipe is connected at the upper end of the second supporting plate, a through long hole is axially formed in the middle of the pipe wall of the steel pipe, a spring is arranged in the steel pipe, a first spring seat and a second spring seat are respectively arranged at two ends of the spring, the other side of the second spring seat is connected with a graphite rod, an adjusting sleeve capable of axially sliding is sleeved on the outer wall of the steel pipe, a radial locking screw hole is formed in the adjusting sleeve, a locking bolt is connected onto the radial locking screw hole, a positioning nut is connected to the radial side of the outer wall of the adjusting sleeve, a screw rod is arranged on the positioning nut, the end part of the screw rod is, the tail end of the screw rod is provided with a rotating wheel which is convenient to rotate.

In the grounding gun installed on the rotating shaft, a graphite rod connecting sleeve is arranged on the second spring seat at the side contacting with the graphite rod, the graphite rod connecting sleeve is sleeved with the graphite rod,

The grounding gun mounted on the rotary rotating shaft is characterized in that the contact sides of the first spring seat and the second spring seat with the springs are respectively provided with a connecting platform with a horn-shaped cross section, and one side of the connecting platform close to the first spring seat or the second spring seat is provided with a small opening

a first locking screw hole is formed in the axial direction of the adjusting sleeve, a first locking bolt is arranged on the first locking screw hole, and the end portion of the first locking bolt is in contact with the outer wall of the steel pipe.

And a second locking screw hole is formed in the axial direction of the fastening nut, and a second locking bolt is arranged on the second locking screw hole.

The first spring seat and the second spring seat are connected with the inner wall of the steel pipe in a sliding fit manner.

The spring is made of stainless steel, and the wire diameter of the spring is 1mm, 14mm, 175mm and 33N.

The long strip holes are 60mm long and 15mm wide.

The first supporting plate is provided with a transverse adjusting waist hole which is positioned at the connecting part of the first supporting plate and the second supporting plate.

The second supporting plate is provided with a longitudinal adjusting waist hole which is positioned at the connecting part of the first supporting plate and the second supporting plate.

The first supporting plate is provided with a bending part forming an angle of 30 degrees with the horizontal direction.

Compared with the prior art, the invention improves the service life of the product and reduces the cost by changing the connecting and fixing structure of the prior electrostatic discharge device and the grounding gun arranged on the rotating shaft, in terms of the grounding gun structure arranged on the rotating shaft, a steel pipe is used as a main body of the grounding gun arranged on the rotating shaft, a through long hole is axially arranged in the middle of the pipe wall of the steel pipe, a spring is arranged in the steel pipe, a first spring seat and a second spring seat are respectively arranged at two ends of the spring, the other side of the second spring seat is connected with a graphite rod, an adjusting sleeve capable of axially sliding is sleeved on the outer wall of the steel pipe, a radial locking screw hole is arranged on the adjusting sleeve, a locking bolt is connected on the radial locking screw hole, a positioning nut is connected on the radial side of the outer wall of the adjusting sleeve, a screw rod is arranged on the positioning nut, the end part of the screw rod is connected with one end, the tail end of the screw is provided with a rotating wheel which is convenient to rotate, so that when the device is used, a graphite rod, a second spring seat, a spring and a first spring seat are sequentially placed in a steel pipe, then an adjusting sleeve is sleeved outside the steel pipe, the screw is used for connecting the sleeve and a connecting rod in an sleeving manner, after the device is assembled, the first-step adjustment is carried out, namely the adjusting sleeve is pushed, the screw drives the connecting rod to apply force on the first spring seat, the compression spring pushes the graphite rod to enable the end part of the graphite rod to be in contact with a rotating shaft or a required discharge area, and meanwhile, the locking bolt is rotated to; the second step is to rotate the rotating wheel at the tail part of the screw rod, the screw rod moves axially, and the connecting rod drives the first spring seat to move, so that the pressure of the spring on the graphite rod reaches a fixed range, the contact between the graphite rod and the rotating shaft is ensured, and the dynamic balance of the rotating shaft cannot be influenced. The connection of the screw rod, the locking sleeve and the first spring seat is indirectly realized through the positioning nut and the connecting rod without axial direction, and the purpose is to ensure that the force acting on the first spring seat is single thrust, avoid axial rotation to enable the spring to generate torsion, and further improve the control between the pressure of the graphite rod and the pressure of the rotating shaft.

The graphite rod connecting sleeve is arranged on the second spring seat and in contact with the graphite rod, and is sleeved with the graphite rod, so that the contact resistance can be reduced firstly, the second spring seat can realize traction of the graphite rod when the graphite rod is replaced, and the replacement efficiency of the graphite rod is improved.

The connection platform with the spring contact side of first spring holder and second spring holder be equipped with the cross-section respectively for loudspeaker form, and the one side that the connection platform is close to first spring holder or second spring holder side is the osculum, and the setting of connection platform is in order to realize the body coupling of first spring holder, second spring holder and spring for the first spring holder of pulling can drive the graphite rod simultaneously, and it can further improve graphite rod and change efficiency.

The spring is made of stainless steel materials, is beneficial to electrostatic electron conduction, and is resistant to corrosion of weak corrosive media such as air, steam and water and chemical corrosive media such as acid, alkali and salt; no magnetism or weak magnetism in an electric field environment; good formability and uniform elasticity at a high temperature of 400 ℃; high plasticity, fatigue strength resistance, heat resistance and corrosion resistance; the spring parameters are preferably the wire diameter of the spring, the outer diameter, the free length and the total number of turns of the spring are 1mm, 14mm, 175mm and 33N, and the spring parameters are measured and obtained through multiple tests of an applicant; if the wire diameter is too thin and the free length is too long, the spring is soft and uneven in stress, the spring is easy to bend on the inner wall of the steel pipe, uneven pressure is caused on the graphite rod, poor conductive contact is caused, and the conductive performance is reduced.

The long strip hole is 60mm long and 15mm wide, so that the first spring seat can move linearly under the adjustment of the screw rod, the stroke size and the deformation of the spring can be conveniently observed, and the retraction and the taking out of the spring and the graphite rod are convenient; when the graphite carbon rod is worn to the limit, the graphite carbon rod needs to be replaced, the adjusting sleeve is taken down only by loosening the fastening nut on the adjusting sleeve, and the first spring seat, the second spring seat, the spring and the graphite rod are pulled outwards by the small screw cutter through the strip-shaped hole and can be taken out for replacement.

With electrostatic discharge device's connection fixed knot structure, set up horizontal adjustment waist hole on first fagging, set up vertical adjustment waist hole on the second fagging, it is horizontal, it is fixed that vertical adjustment waist hole passes through bolt and lock nut, can realize first fagging horizontal and longitudinal movement, adjust the horizontal position and the vertical height of graphite rod from this, make the graphite rod can aim at the compressor pivot, let its wearing and tearing even, avoid the graphite rod because contact failure and the atress that the misalignment caused, because fastening nut sets up on the position continuous with big lid bolt of unit, and expose pivot position and space limitedly, be provided with the flexion that is 30 jiaos with the horizontal direction in first fagging, not only can make fastening nut and big lid bolt of unit firm the connection, also play the effect of supplementary centering to ground rifle position simultaneously. In one side embedding spring of second spring holder, the opposite side is connected with the graphite rod adapter sleeve, and the graphite rod adapter sleeve cup joints in the graphite rod external diameter, has reduced contact resistance, makes its response electricity transmit to ground connection rifle shell in proper order through this spring holder, second fagging, first fagging, the big lid bolt of unit, and compressor body and grounding body accomplish and discharge.

In summary, compared with the existing inlet grounding brush, the invention has the following advantages:

1. The existing grounding guns are mostly imported grounding electric brushes, the cost is high, the manufacturing cost of the imported grounding electric brushes is divided into an L type and an S type according to the models, the manufacturing cost is divided into 3-7 ten thousand yuan according to the models, the grounding guns of the invention are all composed of simple existing parts with lower cost, and the cost is far lower than that of the imported grounding electric brushes;

2. The inlet grounding electric brush is complex to install, and a hole needs to be formed in the cylinder cover of the compressor body again.

3. The inlet grounding electric brush needs to go through a grounding wire and install a grounding control circuit and a grounding box.

4. The brush hair (filament) of the inlet grounding electric brush needs to be replaced only after 3 months of abrasion, and the carbon rod of the grounding gun of the invention is replaced at least two years of abrasion.

5. The inlet grounding electric brush is difficult to maintain, has high risk and is very inconvenient to operate; the grounding gun is simple and rapid to maintain, and when the graphite rod is in poor contact, the induction electricity can be continuously kept to be in continuous contact with the ground for discharging only by adjusting the screw rod.

6. The inlet grounding electric brush is worn by the gold-plated metal wire, the worn metal wire is accumulated in the compressor cylinder body and is easy to enter the compressor cylinder body, so that the service life is shortened.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:

Fig. 1 is a schematic view of the installation structure of the present invention.

Fig. 2 is a schematic diagram of the mechanism of the present invention.

FIG. 3 is a schematic view of the structure of the A-A surface of the steel pipe of the present invention.

FIG. 4 is a schematic view of the structure of the B-B surface of the steel pipe of the present invention.

FIG. 5 is a schematic view of a connection structure of the first spring seat and the connecting rod according to the present invention.

fig. 6 is a schematic view of a second spring seat structure.

In the figure: the graphite rod locking device comprises a first supporting plate 1, a fastening nut 2, a second supporting plate 3, a steel pipe 4, a spring 5, a first spring seat 6, a second spring seat 7, a rotating wheel 8, a screw 9, an adjusting sleeve 10, a graphite rod 11, a first locking bolt 12, a bending part 13, a positioning nut 14, a connecting rod 15, a graphite rod connecting sleeve 16, a second locking bolt 21, a long hole 41, a horizontal line kidney hole 101 and a longitudinal kidney hole 301.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.

as shown in fig. 1-6, a grounding gun mounted on a rotating shaft is connected to a steering support on the rotating shaft, conducts electricity through a graphite rod 11, transmits induction electricity to a steel pipe 4 of the grounding gun through a second spring seat 7, transmits the induction electricity to a second supporting plate 3 through the steel pipe 4, transmits the induction electricity to a first supporting plate 1, transmits the induction electricity to a second bolt 21 on a big cover of a unit through a fastening nut 2 on the first supporting plate 1, transmits the induction electricity to a compressor body through the second bolt 21, and finally releases the grounding; the first spring seat 6 and the second spring seat 7 are made of copper materials, so that the electric conductivity is enhanced, and the first supporting plate 1, the second supporting plate 3 and the spring 5 are made of stainless steel materials, so that the electric conductivity is good, the corrosion resistance is good, the weldability is good, and the hot cracking tendency is small; a through strip hole 41 is axially formed in the middle of the pipe wall of the steel pipe 4, a first spring seat 6, a spring 5 and a second spring seat 7 are arranged in the strip hole 41, the first spring seat 6 and the second spring seat 7 are respectively arranged at two ends of the spring 5, a graphite rod connecting sleeve 16 is arranged on the other side of the second spring seat 7, the graphite rod connecting sleeve 16 is connected with a graphite rod 11, the graphite rod connecting sleeve 16 is used for placing the carbon rod sleeve 11 into the graphite rod connecting sleeve 16 to be clamped before a carbon rod is installed, the spring and the first spring seat are sequentially placed into the strip hole 41 of the stainless steel pipe 4, and when the spring 5 is taken out, the spring 5 and the graphite rod 11 can be taken out together; a cylindrical connecting rod 15 which is made of copper materials and has a groove at the center is arranged on the top surface of the first spring seat 6, the diameter of the groove of the connecting rod 15 is larger than that of the screw rod 9, the connecting rod 15 is axially connected with one end of the screw rod 9, the screw rod 9 is penetrated and connected with the positioning nut 14, and the other end of the screw rod 9 is fixedly connected with the rotating wheel 8, so that the screw rod 9 can be driven to rotate by rotating the rotating wheel 8, the connecting rod 15 is pushed, the first spring seat 6 is axially moved in the long hole 41, and the extension and; an adjusting sleeve 10 is sleeved on the outer side of the steel pipe 4, the adjusting sleeve 10 is connected with a positioning nut 14 into a whole, as shown in fig. 3, the screw rod 9, the adjusting sleeve 10, the positioning nut 14 and a connecting rod 15 are connected into a whole, the screw rod 9 is adjusted to rotate by a runner 8, the end part of the screw rod 9 pushes the connecting rod 15 to move axially through the positioning nut 14 on the adjusting sleeve 10, so that a first spring seat 6 is driven to move axially, the first spring seat 6 applies force to a spring 5 to push a second spring seat 7, and a graphite rod 11 is stressed to tightly contact the second spring seat 7 with a rotating shaft, so that sliding adjustment is realized; when the longer pressure of graphite rod 11 wearing and tearing reduces and leads to contact failure, can remove earlier adjusting collar 10 and make it be close to graphite rod 11 direction, also extrude a certain position with spring 5 simultaneously, screw up locking bolt 12 on the adjusting collar 10, can fix a position, rethread adjusting screw 9 adjusts, can shorten the regulation time greatly like this.

Wherein, seted up first locking screw in the axial of adjusting collar 10, be equipped with first locking bolt 12 on first locking screw, the tip and the contact of 4 outer walls of steel pipe of first locking bolt 12, the accessible is rotatory first locking bolt 12 like this and is realized adjusting collar 10 and slide and fix at 4 outer walls of steel pipe.

The axial of the fastening nut 2 is provided with a second locking screw hole, and the second locking screw hole is provided with a second locking bolt 21, so that the grounding gun arranged on the rotating shaft can be improved and fixed on a steering support of the rotating shaft.

First spring holder 6 and second spring holder 7 are connected with steel pipe 4 inner wall for sliding fit, are convenient for spring 5, first spring holder 6 and second spring holder 7 to move about in rectangular hole 41.

The spring 5 is made of stainless steel materials, is beneficial to electrostatic electron conduction, and is resistant to corrosion of weak corrosive media such as air, steam and water and chemical corrosive media such as acid, alkali and salt; no magnetism or weak magnetism in an electric field environment; good formability and uniform elasticity at a high temperature of 400 ℃; high plasticity, fatigue strength resistance, heat resistance and corrosion resistance; the wire diameter x outer diameter x free length x total turns of the spring 5 are: 1mm 14mm 175mm 33N, if the wire diameter is too large, the pressure is too strong, and the fine adjustment pressure can cause the vibration data of the high-speed rotating shaft to rise; if the wire diameter is too thin and the free length is too long, the spring 5 is soft and stressed unevenly, the spring 5 is easy to bend on the inner wall of the steel tube 4, uneven pressure is caused on the graphite rod 11, the conductive contact is poor, and the conductive performance is reduced.

The length of the long hole is 60mm, and the width of the long hole is 15mm, so that the first spring seat 6 moves linearly under the adjustment of the screw rod 9, and the spring is stressed in the wall of the steel pipe and does not rotate; meanwhile, the travel size and deformation of the spring 5 can be conveniently observed; the retraction and the taking out of the spring 5 and the graphite rod 11 are convenient; when the graphite rod 11 is worn to the limit, the graphite rod needs to be replaced by only loosening the fastening nut 12 on the adjusting sleeve 10, taking down the adjusting sleeve 10 and pulling the first spring seat 6, the second spring seat 7, the spring 5 and the graphite rod 11 outwards through the strip hole 41 by using a small screw cutter.

As shown in fig. 2, a transverse adjusting waist hole 101 is arranged on the first supporting plate 1 and is positioned at the connecting part of the first supporting plate 1 and the second supporting plate 3; a longitudinal adjusting waist hole 301 is formed in the second supporting plate 3 and is also positioned at the connecting part of the first supporting plate 1 and the second supporting plate 3; fix through nut and bolt, the relative position of first fagging 1 and second fagging 3 is adjusted to the elasticity of accessible runner 8, realizes the holistic horizontal and fore-and-aft removal of this device.

Be provided with the flexion that is 30 jiaos with the horizontal direction on first fagging 1, can make fastening nut 2 and big lid bolt of unit firm connection, also play the effect of supplementary centering to the ground rifle position simultaneously.

The first supporting plate 1 is provided with a transverse adjusting waist hole 101, the second supporting plate 3 is provided with a longitudinal adjusting waist hole 301, the transverse adjusting waist hole 101 and the longitudinal adjusting waist hole 301 are both positioned at the connecting part of the first supporting plate 1 and the second supporting plate 3, and the fixing is carried out through a locking nut and a bolt, as shown in fig. 2, the relative position of the first supporting plate 1 and the second supporting plate 3 can be adjusted through adjusting the tightness of the locking nut, so that the movement of the invention is realized.

wherein, considering the limitation of the position and space of the exposed rotating shaft, the first supporting plate 1 is provided with a bending part 13 which forms an angle of 30 degrees with the horizontal direction, thus simultaneously playing an auxiliary centering role for the position of the grounding gun.

The rotating machinery equipment using steam as driving power of the invention can generate induced potential (voltage) on a rotating shaft during rotation due to the mechanical or electrical characteristics of the rotating machinery equipment, and the induced potential on a rotating rotor can generate electric arc (electrostatic discharge) on lubricating oil and a bearing bush. The grounding gun utilizes the carbon rod to lead the induced electricity on the rotor and the bearing bush to the ground (the grounding resistance requires Rd to be less than or equal to 10 omega) for releasing, so that the voltage of the rotating shaft to the ground is kept at a safe level.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.