CN219187605U

CN219187605U - Excitation driving device

Info

Publication number: CN219187605U
Application number: CN202223356796.3U
Authority: CN
Inventors: 王纯; 卞淑惠; 杨秀菊
Original assignee: Xuzhou Rhenzi Precision Cnc Machine Tool Co ltd
Current assignee: Xuzhou Rhenzi Precision Cnc Machine Tool Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-06-16
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses an excitation driving device, which comprises a stator and a rotor, wherein a plurality of internal teeth are arranged on the outer surface of the rotor along the circumferential direction of the rotor, a plurality of external teeth are arranged on the inner surface of the stator along the circumferential direction, tooth holes are formed between two adjacent external teeth, the internal teeth are arranged in the tooth holes, and the tooth holes are communicated with an external hydraulic medium source; the width of the tooth holes along the circumferential direction is larger than that of the internal teeth, and the two side surfaces of the internal teeth along the circumferential direction and facing the external teeth are planes. The excitation driving device has the advantages that the effective driving force area on the side surface of the rotor is large, the mechanical moment is increased, the conversion efficiency is improved, and the high-precision surface is easier to realize, so that the precision of the rotating matching surface of the rotor and the stator is improved; the two sides of the internal tooth are easier to realize a small-clearance structure, and the corresponding excitation sensitivity is improved.

Description

Excitation driving device

Technical Field

The utility model relates to the technical field of machining equipment, in particular to an excitation driving device.

Background

Vibration cutting is a form of machining and has found wide application in some irregular structures or difficult to cut materials and precision machining. The vibration cutting processing equipment generally comprises an excitation driving device such as an electrohydraulic excitation servo mechanism, wherein a rotor and a stator are arranged in the electrohydraulic excitation servo mechanism, a workpiece to be processed is connected with the electrohydraulic excitation servo mechanism, hydraulic media such as hydraulic oil and the like are introduced into the electrohydraulic excitation servo mechanism at a certain pressure, a tooth-shaped structure between the rotor and the stator is driven to rotate back and forth at a certain frequency to form excitation motion, so that hydraulic power with a certain reversing frequency is converted into mechanical torque to be output, the workpiece to be processed is driven by the electrohydraulic excitation servo mechanism to do excitation motion, and the workpiece is placed in a container filled with semi-liquid abrasive, so that abrasive particles or abrasive blocks in the semi-liquid abrasive material rub back and forth with the surface of the workpiece in the excitation motion at a certain frequency, and a cutting effect is generated on the surface of the workpiece.

However, the existing excitation driving device has the defects that part of hydraulic power cannot be converted into effective driving force, so that the conversion efficiency of converting the hydraulic power into mechanical torque is low, and the output torque is small, thereby influencing the efficiency of vibration cutting and the range of workable workpieces. The single-tooth electrohydraulic excitation servo mechanism is adopted, the volume of an excitation oil cavity is larger, and the response sensitivity of excitation motion is poorer. The friction loss between the rotor and the stator of the electrohydraulic excitation servo mechanism is large, and the service life is influenced.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide an excitation driving device for overcoming the defects in the prior art.

The utility model solves the technical problems by the following technical scheme:

an excitation driving device comprises a stator and a rotor, wherein the rotor is provided with a plurality of internal teeth along the circumferential outer surface of the rotor, the stator is provided with a plurality of external teeth along the circumferential inner surface,

the gap between two adjacent external teeth forms a tooth hole, the internal teeth are arranged in the tooth hole, and the tooth hole is communicated with an external hydraulic medium source;

the width of the tooth holes along the circumferential direction is larger than the width of the internal teeth, and the internal teeth are plane surfaces along the circumferential direction and towards the two side surfaces of the external teeth.

In this scheme, through above-mentioned setting, internal tooth, external tooth form in proper order alternately in the circumference and arrange mutually support for the tooth hole has formed the clearance cavity that the gyration motion required in the both sides of internal tooth, and when the clearance cavity of both sides is poured into in turn to hydraulic medium, the internal tooth is driven and is made the round trip rotation of a small extent with certain frequency in the clearance cavity to realize converting hydraulic power into mechanical moment, and this mechanical moment has constituted the power of excitation drive. The internal teeth adopt planar structures along the circumferential direction and towards the two side surfaces of the external teeth, compared with other non-planar structures, the direction of acting force of hydraulic media at each point on the plane is consistent with the rotation direction of the internal teeth, and the hydraulic media are converted into effective driving force, so that the effective driving force area on the side surface is large, the mechanical moment is increased, and the conversion efficiency is improved. Meanwhile, through the planar structure, the internal teeth are regular in shape, so that the high-precision surface of the internal teeth and the body of the rotor is easier to realize through split machining, the machining difficulty is reduced, and the internal teeth and the body of the rotor are embedded and assembled after the split machining. The split machining mode improves the matching precision of the rotor relative to the rotating matching surface of the stator (the root round surface of the inner tooth and the top round surface of the outer tooth), so that the static pressure supporting rigidity of the rotor is improved (the static pressure supporting means that the static pressure generated by hydraulic oil acts on the root round surface of the inner tooth, the rotor and the stator are separated, so that the rotor can rotate, the static pressure supporting rigidity means that the rotor can rotate stably under the static pressure), the small-gap structure is easier to realize on two sides of the inner tooth, and the corresponding excitation sensitivity of the rotor is improved.

Preferably, the plane is a rectangular plane.

In the scheme, the inner teeth adopt rectangular plane structures along the circumferential direction and towards the two sides of the outer teeth, namely, the inner teeth are rectangular teeth, the rectangular plane structures enable the structures of the inner teeth to be simpler, the shapes of the inner teeth to be more regular, and not only are the surfaces of each inner tooth easy to improve the machining precision; and under the condition that the internal teeth and the rotor body are processed in a split way, the internal teeth can be arranged side by side and integrally processed, so that the surfaces of the internal teeth are uniform in high precision, the uniform effect of the high precision is improved, and the assembly precision of the surfaces of the rotor and other parts is improved.

Preferably, the rotor and the stator are in clearance fit along the radial direction of the rotor;

a first cavity is arranged between the tooth top of the inner tooth along the radial direction of the rotor and the stator, and the first cavity is communicated with an external hydraulic medium source; and/or, the tooth top of the external tooth is provided with a second cavity along the radial direction of the rotor and between the rotor, and the second cavity is communicated with an external hydraulic medium source.

In the scheme, a hydraulic medium film is formed by injecting a hydraulic medium into a clearance cavity between a rotor and a stator; by injecting the hydraulic medium into the first cavities and/or the second cavities which are circumferentially distributed, the static pressure of the hydraulic medium supports the rotor, the contact surfaces of the rotor and the stator are completely separated, friction loss between the rotor and the stator is greatly reduced, an approximately frictionless hydrostatic bearing is formed between the rotor and the stator (namely, the hydrostatic bearing refers to a bearing structure formed by medium cavities of the rotating rotor and the stationary stator, and the static pressure generated by the hydraulic medium is used for supporting frictionless rotation of the bearing structure), so that the stress is more balanced, the back and forth rotation is easier, and the excitation efficiency is improved. And, through hydraulic medium injection first cavity, can prevent hydraulic medium from flowing to the opposite side from one side of internal tooth, avoid weakening hydraulic medium's driving force to the internal tooth. The stress at different positions in the circumferential direction can be adjusted by adjusting the parameters such as the pressure, the frequency and the like of the first cavity or the second cavity at different positions in the circumferential direction, the adjustment at the corresponding position can be made more easily according to the abrasion condition between the first cavity and the second cavity, and the degree of controllability is high.

Preferably, when a first cavity is arranged between the tooth top of the internal tooth and the stator along the radial direction of the rotor, a first channel is further arranged on the excitation driving device, and two ends of the first channel are communicated with the first cavity and an external hydraulic medium source;

when the tooth tops of the external teeth are provided with a second cavity along the radial direction of the rotor and between the rotor, the excitation driving device is also provided with a second channel, and two ends of the second channel are communicated with the second cavity and an external hydraulic medium source.

In this scheme, through the first passageway and the second passageway of above-mentioned structure, provide outside hydraulic medium for corresponding first cavity and second cavity.

Preferably, when the excitation driving device is provided with the first channels, two first channels symmetrically arranged along the circumferential direction are communicated with the same external hydraulic medium source in parallel;

when the second channels are arranged on the excitation driving device, the two second channels symmetrically arranged along the circumferential direction are communicated with the same external hydraulic medium source in parallel.

In the scheme, through the parallel connection structure, the hydraulic pressure in two channels (a first channel and a second channel) which are circumferentially symmetrical is equal, and constant pressure is easy to realize; by adjusting the external hydraulic medium in communication with the two channels, the stability and stiffness of the hydrostatic bearing is greatly improved, wherein stiffness refers to the ability to achieve stability.

Preferably, the number of the external teeth and the number of the internal teeth are both an even number, and a plurality of the internal teeth and a plurality of the external teeth are respectively symmetrically arranged in the circumferential direction.

In this scheme, adopt internal tooth and external tooth of even number to set up along circumference symmetry respectively, form two liang symmetry modes, further improved the atress equilibrium of rotor.

Preferably, both sides of each internal tooth along the circumferential direction are respectively provided with a third channel, and both ends of each third channel are communicated with the tooth holes and an external hydraulic medium source;

in the third passages on both sides of each of the internal teeth in the circumferential direction, at least one of the third passages is provided in a direction different from the direction in which the internal teeth are provided.

In the scheme, through the third channel with the structure, external hydraulic driving force is provided for the internal teeth; the arrangement direction of at least one third channel is different from the arrangement direction of the internal teeth, so that the hydraulic medium in the third channel flows to and impacts the side surfaces of the internal teeth to drive the internal teeth to rotate; the resulting flow direction arrangement is advantageous in reducing the flow resistance of the hydraulic medium. By adjusting parameters such as pressure, frequency and the like of the third channels on two sides of the internal teeth, the internal teeth can respectively generate the same or different vibration effects in the clockwise direction and the anticlockwise direction, and the range of excitation processing adaptation is wide.

Preferably, the third passages on both sides of each internal tooth in the circumferential direction are provided at both ends of the excitation driving device in the axial direction of the rotor, respectively.

In this scheme, through the third passageway that above-mentioned structure set up for the driving force of internal tooth both sides distributes at excitation drive arrangement along axial both ends, but not same one end, disperses the arrangement of two third passageways, easy processing.

Preferably, the stator is further provided with an annular channel along the circumferential direction, and the annular channel is arranged between the external teeth and the body of the stator;

each third channel is communicated with the annular channel, and the annular channel is communicated with an external hydraulic medium source.

In this scheme, through all communicate every third passageway in annular channel for every internal tooth can obtain the same hydraulic power, is favorable to the atress on the rotor outer peripheral face balanced, rotates easily, improves excitation efficiency.

Preferably, the excitation driving device further comprises two end covers, wherein the two end covers are respectively and hermetically connected with two ends of the stator along the axial direction of the rotor, and the two end covers are respectively and hermetically connected with the circumferential surface of the rotor along the axial direction of the rotor.

In this scheme, through the sealing connection of above-mentioned two different directions, guaranteed excitation drive arrangement at different direction complex sealed effect, avoid hydraulic power loss, be favorable to hydraulic power's conversion efficiency.

The excitation driving control method utilizes the excitation driving device to generate excitation motion, and comprises the following steps:

connecting the rotor with a workpiece to be processed;

external hydraulic medium is alternately injected into the sprocket holes from both sides of the internal teeth in the circumferential direction to drive the internal teeth to reciprocate in the circumferential direction.

According to the excitation driving control method, the excitation driving device is utilized, hydraulic power drives the inner teeth to rotate back and forth in a small range in the clearance cavities at two sides of the inner teeth through the method, so that the rotor is driven to rotate back and forth relative to the stator, and an excitation effect is generated. By controlling parameters such as frequency, pressure and the like of an external hydraulic medium, the angular speed, swing amplitude and frequency change of the vibration rotor are realized. The hydraulic power is converted into mechanical torque, and the mechanical torque forms the power of excitation driving.

when a first cavity is provided between the tooth tip of the internal tooth and the stator in the radial direction of the rotor, the excitation drive control method further includes the steps of: injecting an external hydraulic medium into the first cavity;

when the tooth top of the external tooth is provided with a second cavity along the radial direction of the rotor and between the rotor, the excitation driving control method further comprises the following steps: an external hydraulic medium is injected into the second cavity.

In this scheme, utilize above-mentioned structure setting, through injecting the outside hydraulic medium into a plurality of first cavitys and/or a plurality of second cavitys that circumference distributes, the clearance between rotor and stator forms the hydraulic medium membrane, holds up the rotor, and the contact surface of both (rotor and stator) is separated by the whole, has reduced the friction loss between the two by a wide margin, forms approximately frictionless hydrostatic bearing between the two, and the atress is more balanced, and the round trip rotation is easier, has improved excitation efficiency. The stress at different positions in the circumferential direction can be adjusted by adjusting the parameters such as pressure, frequency and the like in the first cavity and the second cavity, the adjustment at the corresponding position is easier to be made according to the abrasion condition between the first cavity and the second cavity, and the degree of controllability is high.

Preferably, the method is characterized in that,

the step of injecting the external hydraulic medium into the first cavity may be preceded by the steps of: the two first cavities which are symmetrical along the circumferential direction are communicated with the same external hydraulic medium source in parallel;

the "injecting external hydraulic medium into the second cavity" further includes the following steps: and connecting the two second cavities which are symmetrical along the circumferential direction in parallel with the same external hydraulic medium source.

In this scheme, through with two first cavitys parallel connection in same outside hydraulic medium source along circumference symmetry for the hydraulic pressure in two cavitys of circumference symmetry equals, and through adjusting the outside hydraulic medium with two cavity intercommunication, promoted hydrostatic bearing's stability and rigidity greatly, wherein, rigidity refers to the ability that obtains stability.

The utility model has the positive progress effects that: when the hydraulic medium is alternately injected into the clearance cavities at two sides of the internal teeth, the internal teeth are driven to rotate back and forth (clockwise or anticlockwise rotation) in the clearance cavities in a small range at a certain frequency, so that the hydraulic power is converted into mechanical torque, and the mechanical torque forms the power of excitation driving. The internal teeth adopt planar structures along the circumferential direction and towards the two side surfaces of the external teeth, compared with other non-planar structures, the driving force direction of the hydraulic medium at each point on the plane to the plane is consistent with the rotation direction of the internal teeth, the effective driving stress area on the side surfaces is large, the mechanical moment is increased, and the conversion efficiency is improved. Meanwhile, through the planar structure, the internal teeth are regular in shape, so that the high-precision surface of the internal teeth and the body of the rotor is easier to realize through split machining, the machining difficulty is reduced, and the internal teeth and the body of the rotor are embedded and assembled after the split machining. The split machining mode ensures that the matching precision of the rotor relative to the rotating matching surface of the stator (the root round surface of the inner tooth and the top round surface of the outer tooth) is improved, thereby improving the static pressure supporting rigidity of the rotor, ensuring that the two sides of the inner tooth are easier to realize a small-clearance structure, and improving the corresponding excitation sensitivity of the rotor.

Drawings

Fig. 1 is a schematic structural diagram of an end face of an excitation driving apparatus a according to embodiment 1 of the present utility model (wherein, an upper half portion is an internal structural diagram with end caps removed).

Fig. 2 is a schematic view of the internal structure of the excitation driving apparatus B according to embodiment 1 of the present utility model after the end face is uncapped.

FIG. 3 is a cross-sectional view taken along the line C1-D1-E1 in FIG. 1.

Fig. 4a is a schematic structural diagram of a rotor body according to embodiment 1 of the present utility model.

FIG. 4b is a cross-sectional view taken along the line C2-D2-E2 in FIG. 4 a.

Fig. 5a is a cross-sectional view 1 of the internal teeth of example 1 of the present utility model.

Fig. 5b is a cross-sectional view 2 of the internal teeth of embodiment 1 of the present utility model at another angle.

Fig. 6a is a schematic structural diagram of a stator according to embodiment 1 of the present utility model.

FIG. 6b is a cross-sectional view taken along the line C3-D3-E3 in FIG. 6 a.

Fig. 7 is a flowchart of the excitation driving control method according to embodiment 2 of the present utility model.

Fig. 8 is a flowchart of the excitation driving control method according to embodiment 3 of the present utility model.

Fig. 9 is a flowchart of the excitation driving control method according to embodiment 4 of the present utility model.

Reference numerals illustrate:

the excitation driving device 1, the electrohydraulic excitation servo mechanism 10,

the end cap 2, the o-ring seal groove 21,

stator 3, external teeth 31, tooth holes 32, body 33 of the stator, top rounded surface 34,

rotor 4, internal teeth 41, flat surfaces 42, rotor body 43, root circular surface 44, internal tooth grooves 45, mounting holes 46,

the annular channel 5, the annular oil groove 50,

the third passage 6, the inclined oil groove 60,

the first cavity 7, the tip oil cavity 70,

the second cavity 8, the root pocket 80,

the first passage 9, the addendum hydrostatic oil passage 90,

the second passage 11, the root hydrostatic oil passage 110,

the circumferential direction F of the rotor, the axial direction G of the rotor and the radial direction H of the rotor.

Detailed Description

The utility model is further illustrated by means of the following examples, which are not intended to limit the scope of the utility model.

Example 1

As shown in fig. 1 to 6, the present embodiment provides an excitation driving device 1, and the excitation driving device 1 specifically is an electrohydraulic excitation servo mechanism 10, which includes a stator 3, a rotor 4, and two circular end caps 2, and the electrohydraulic excitation servo mechanism 10 includes two end faces, an a end face and a B end face, along an axial direction G of the rotor 4. The rotor 4 is mounted on the inner ring of the stator 3, the center of the end covers 2 is a through hole, and the two end covers 2 cover the end surfaces of the stator 3 on the end surfaces A and B respectively and are sleeved on the circumferential surfaces of the two ends of the rotor 4.

The workpiece to be vibration-machined is attached to one end (not shown) of the rotor 4 extending in the axial direction G thereof, and the workpiece is placed in a container filled with a semi-liquid abrasive in which abrasive grains or abrasive blocks for grinding the surface of the workpiece are provided.

The rotor 4 is embedded with a plurality of internal teeth 41 along the outer surface of the circumference F of the rotor 4, the stator 3 is processed with a plurality of external teeth 31 along the inner surface of the circumference F, gaps between two adjacent external teeth 31 form a tooth hole 32, the internal teeth 41 are arranged in the tooth hole 32, the tooth hole 32 is communicated with an external hydraulic medium source, the hydraulic medium in the embodiment is oil, and in other embodiments, the hydraulic medium can be a proper liquid material except oil. The oil source with which the perforations 32 communicate is a first oil source. The inner and outer relationship between the inner teeth 41 and the outer teeth 31 is named with respect to the inner and outer ring relationship between the rotor and the stator, and the inner teeth 41 are mechanically embedded in the outer surface of the rotor 4, so that the inner teeth 41 are also outer teeth of the rotor.

The width of the tooth holes 32 in the circumferential direction F is larger than the width of the internal teeth 41, so that the tooth holes 32 form clearance cavities required for the turning motion on both sides of the internal teeth 41, and both side surfaces of the internal teeth 41 facing the external teeth 31 in the circumferential direction F are flat surfaces 42.

Through the arrangement of the structure, the internal teeth 41 and the external teeth 31 are sequentially and alternately distributed in the circumferential direction F and are mutually matched, when oil of a first oil source is alternately injected into clearance cavities at two sides of the internal teeth 41, the internal teeth 41 of the driving rotor 4 rotate back and forth (rotate clockwise or anticlockwise) in the clearance cavities in a small range at a certain frequency, so that excitation motion is formed, hydraulic power is converted into mechanical torque, and the mechanical torque forms excitation driving power. The electrohydraulic excitation servo mechanism 10 drives the workpiece to perform excitation motion, so that the workpiece and the grinding material rub back and forth at a certain frequency, and a cutting effect is generated on the surface of the workpiece.

The inner teeth 41 adopt a planar structure along the circumferential direction F and towards both side surfaces of the outer teeth 31, and compared with other non-planar structures (for example, a traditional tooth-shaped structure, the side surfaces of which are involute curved surfaces and irregular planar structures), the direction of acting force of hydraulic oil on the plane 42 on each point is consistent with the rotation direction of the inner teeth 41, and acting forces on all points can be completely converted (rather than partially converted) into effective driving forces, so that the effective driving force area on the side surfaces is large, the output mechanical moment is increased, and the conversion efficiency is improved. In the conventional tooth profile structure, since the side surface is an involute curved surface, on the involute curved surface, the direction of the hydraulic oil acting force at all points is not identical to the rotation direction of the internal teeth 41, but the acting force direction of some points is inclined with the rotation direction of the internal teeth 41, and only part of the acting force (component force) identical to the rotation direction forms an effective driving force. In such a case, the effective driving force area on the sides of the involute teeth is small, reducing the mechanical torque output, and thus, the conversion efficiency is not good.

And, as shown in fig. 1 to 6, since the two side surfaces of the internal teeth 41 adopt the above-mentioned planar structure, the shape is regular, and is no longer an irregular curved surface (e.g., involute curved surface) of a conventional tooth, the internal teeth 41 and the body 43 of the rotor can be separately processed, i.e., the plurality of internal teeth 41 are separately processed, the body 43 is also separately processed, the internal teeth 41 are then fitted into the internal tooth grooves 45 of the body 43, and the screw is screwed in from the mounting hole 46 of the internal teeth 41 and is fastened and assembled to the body 43. In this split machining mode, since the side surfaces of the internal teeth 41 are regular planar structures, the side surfaces and the top surfaces of the internal teeth 41 are easy to achieve high-precision surfaces, the surface of the body 43 (namely, the root circular surface 44 of the internal teeth 41 after assembly) is a continuous regular cylindrical surface (if the surface is a discontinuous regular cylindrical surface), the high-precision surface is easy to obtain through continuous machining, the top circular surface 34 of the external teeth 31 can also obtain the high-precision surface through continuous machining, so that the matching precision of the rotor relative to the stator is improved (the root circular surface 44 of the internal teeth 41 of the rotor 4 and the top circular surface 34 of the external teeth 31 of the stator 3) and the static pressure supporting rigidity thereof is improved (static pressure supporting means that the static pressure generated by hydraulic oil acts on the root circular surface 44 of the internal teeth to space the rotor 4 from the stator 3 so that the rotor 4 can rotate, and the static pressure supporting rigidity means that the rotor 4 can rotate smoothly under the static pressure).

The electrohydraulic excitation servo mechanism 10 adopts a multi-tooth structure, and compared with a single-tooth structure or a structure with fewer teeth, the electrohydraulic excitation servo mechanism increases torque output and has a compact structure. The two sides of the internal tooth are easier to realize a small-clearance structure, and the corresponding excitation sensitivity of the internal tooth can be improved.

Wherein, the plane 42 is specifically made into a rectangular plane, the internal teeth 41 are rectangular teeth, and the rectangular teeth are adopted, so that the structure is simple, the shape is more regular, and not only the processing precision of each surface of each internal tooth 41 is easy to improve; in addition, in the case where the internal teeth 41 and the rotor body 43 are processed separately, the plurality of internal teeth 41 may be arranged side by side and integrally processed (for example, the plurality of internal teeth are simultaneously integrally processed and then divided into the respective internal teeth), so that the surfaces of the respective internal teeth 41 are uniformly and highly accurate, the uniformity effect of the high accuracy is improved, and the assembly accuracy of the respective surfaces of the rotor 4 and other components is improved.

Of course, the shape of the flat surface 42 is not limited to a rectangle as long as the flat surface is a flat structure, and the shape thereof may be made into other shapes according to the actual fitting needs.

As shown in fig. 1 and 2, the rotor 4 and the stator 3 are in clearance fit along the radial direction H of the rotor 4, and hydraulic oil of the first oil source is injected into the clearance to form a hydraulic oil film. A first cavity 7 is arranged between the tooth top of each internal tooth 41 and the stator 3 along the radial direction H, namely, a tooth top oil cavity 70 of the rotor 4, and the tooth top oil cavity 70 is communicated with an external second oil source. A second cavity 8 is arranged between the tooth top of each external tooth 31 and the rotor 4 along the radial direction H, namely a tooth root oil cavity 80 of the rotor 4, and the tooth root oil cavity 80 is communicated with an external second oil source.

Through the above structure arrangement, when the plurality of tooth top oil cavities 70 and the plurality of tooth root oil cavities 80 distributed in the circumferential direction F are filled with the oil of the second oil source, the static pressure of the hydraulic oil lifts the rotor 4, the contact surfaces of the rotor 4 and the stator 3 are completely separated, friction loss between the rotor 4 and the stator 3 is greatly reduced, an approximately frictionless hydrostatic bearing is formed between the rotor 4 and the stator 3 (namely, the hydrostatic bearing refers to a bearing structure formed by the rotating rotor 4 and the stationary stator 3, and the static pressure generated by the hydraulic oil is used for supporting frictionless rotation of the bearing structure), so that the stress is more balanced, the back and forth rotation is easier, and the excitation efficiency is improved. Further, the injection of the oil of the second oil source into the tip oil chamber 70 can prevent the oil of the first oil source from flowing from one side to the other side of the internal teeth 41 in the gap between the stator 3 and the rotor 4, avoiding weakening the driving force of the oil of the first oil source to the internal teeth 41, because if the oil of the first oil source can flow from one side to the other side of the internal teeth 41, a part of the oil of the first oil source offsets the driving force of the opposite side from the other side. In the embodiment, the first oil source is a power oil source for driving the rotor 4 to excite, and the pressure is higher and is 25-31Mpa; the second oil source is the static pressure oil source (constant pressure) needed by the static pressure bearing between the stator 3 and the rotor 4, and the pressure is lower and is 15-21Mpa. Of course, in other embodiments, the pressure of the two oil sources may be adjusted according to the excitation effect, and the two oil sources may be the same oil source, and the oil is distributed into the oil chambers at different positions through the oil valve and the pipeline.

In addition, by adjusting parameters such as pressure, frequency and the like of the tooth top oil cavity 70 or the tooth root oil cavity 80 at different positions in the circumferential direction F, the stress at the different positions in the circumferential direction F can be adjusted, the adjustment at the corresponding positions can be made more easily according to the abrasion condition between the two, and the controllability degree is high.

As shown in fig. 1-3, the stator 3 of the electrohydraulic excitation servo mechanism 10 is further provided with a first channel 9 and a second channel 11, the first channel 9 is a tooth top static pressure oil duct 90, and the tooth top static pressure oil duct 90 transversely passes through the stator 3 to communicate the tooth top oil cavity 70 with an external second oil source. The second passage 11 is a root static pressure oil passage 110, and similarly, the root static pressure oil passage 110 is also a passage that passes through the stator 3 laterally, and communicates the root oil chamber 80 with an external second oil source, providing external hydraulic oil to the tip oil chamber 70 and the root oil chamber 80. In other embodiments, the first channel 9 and the second channel 11 may also be disposed on other structural components of the electrohydraulic excitation servo mechanism according to different specific structural shapes of the motor, and specific disposition positions of the first channel and the second channel are correspondingly adjusted according to specific structures of the electrohydraulic excitation servo mechanism. In other embodiments, depending on the pressure regulation requirements of the hydrostatic bearing formed between the stator 3 and the rotor 4, only the first cavity 7 (the tooth top oil cavity 70) or only the second cavity 8 (the tooth root oil cavity 80) may be provided, and accordingly only the first passage 9 (the tooth top hydrostatic oil passage 90) and the second passage 11 (the tooth root hydrostatic oil passage 110) may be provided, without necessarily having both the stator 3 tooth top oil cavity 70 and the stator 3 tooth root oil cavity 80 simultaneously with oil. Alternatively, oil of different pressures is injected into the stator 3 tip oil chamber 70 and the stator 3 root oil chamber 80.

Wherein, two first channels 9 that set up along circumference F symmetry connect in parallel in same outside oil source, two second channels 11 that set up along circumference F symmetry connect in parallel in same outside oil source. Thus, the stator 3 forms a plurality of pairs of parallel-connected first and

second passages

9, 11 at different positions in the circumferential direction F thereof. The hydraulic pressure in each pair of channels (the first channel 9 and the second channel 11) symmetrical in the circumferential direction F is equal, so that constant pressure is easy to realize; by adjusting the external hydraulic oil in communication with the two channels, the stability and stiffness of the hydrostatic bearing is greatly improved, wherein stiffness refers to the ability to achieve stability.

As shown in fig. 2, the number of the external teeth 31 and the internal teeth 41 is an even number, and the plurality of internal teeth 41 and the plurality of external teeth 31 are symmetrically arranged in the circumferential direction F, respectively. The even number of the internal teeth 41 and the external teeth 31 are adopted and are respectively and symmetrically arranged along the circumferential direction F to form a two-to-two symmetrical mode, so that the stress balance of the rotor 4 is further improved, and the symmetrical tooth-shaped structure is easy to process.

As shown in fig. 2 and 3, the stator 3 is further provided with an annular channel 5 in the circumferential direction F, in this embodiment the annular channel 5 is embodied as an annular oil groove 50, the annular oil groove 50 being in communication with an external first oil source.

The annular oil groove 50 is disposed between the outer teeth 31 and the body 33 of the stator, and each inner tooth 41 is provided with a third channel 6 along two sides of the circumferential direction F, in this embodiment, the third channels 6 are inclined oil grooves 60, the inclined oil grooves 60 on two sides of each inner tooth 41 are inclined at a certain angle to the arrangement direction of the inner tooth 41, two ends of each inclined oil groove 60 are communicated with the tooth holes 32 and the annular oil groove 50, and external hydraulic driving force is provided for the inner tooth 41 through the third channels 6.

Hydraulic oil in the inclined oil groove 60 flows to and impacts the side surfaces of the internal teeth 41 to drive the internal teeth 41 to rotate; the formed flow direction is beneficial to reducing the flow resistance of the hydraulic oil. By adjusting parameters such as pressure, frequency and the like of the oblique oil grooves 60 on both sides of the internal teeth 41, the internal teeth 41 can respectively generate the same or different vibration effects in the clockwise direction and the anticlockwise direction, and the range of the excitation processing adaptation is wide.

In addition, each inclined oil groove 60 is communicated with the annular oil groove 50 in the circumferential direction, so that each internal tooth 41 can obtain the same hydraulic power, the stress on the outer circumferential surface of the rotor 4 is balanced, the rotation is easy, and the excitation efficiency is improved.

Wherein, two oblique oil grooves 60 on both sides of each internal tooth 41 are respectively arranged on the end face A and the end face B, driving forces on both sides of the internal tooth 41 are distributed at both ends of the electrohydraulic excitation servo mechanism 10 instead of the same end, and the two third channels 6 are distributed in structural arrangement, so that the processing is easy.

As shown in fig. 3, two ends of the two end covers 2 and the stator 3 are in sealing connection in the axial direction G through O-shaped sealing rings in the O-shaped sealing groove 21, and the circumferential surfaces of the two end covers 2 and the rotor 4 are in sealing connection in the radial direction H through O-shaped sealing rings in the other O-shaped sealing groove 21, and the sealing connection between the end covers 2 and the stator 3 and the rotor 4 is arranged in different directions, so that the sealing effect of the electro-hydraulic excitation servo mechanism 10 matched in different directions is ensured, hydraulic power loss is avoided, and the conversion efficiency of hydraulic power is facilitated. In other embodiments, the sealing connection between the end cap 2 and the stator 3 and rotor 4 is not necessarily in a perpendicular relationship in the axial direction G and the radial direction H, and may be adjusted accordingly according to the specific shape and structure of the stator 3 and rotor 4.

Example 2

As shown in fig. 7, the present embodiment further provides an excitation driving control method, which generates excitation motion by using the electrohydraulic excitation servo mechanism of embodiment 1, the excitation driving control method includes the following steps:

s1, connecting a rotor with a workpiece to be processed;

and S2, external hydraulic oil is alternately injected into the tooth holes from two sides of the internal tooth along the circumferential direction so as to drive the internal tooth to move back and forth along the circumferential direction.

The excitation driving control method utilizes the electrohydraulic excitation servo mechanism, and through the method, hydraulic power drives the internal teeth to rotate back and forth in a small range in the clearance cavities at the two sides of the internal teeth, so that the rotor is driven to rotate back and forth relative to the stator, and an excitation effect is generated. By controlling parameters such as frequency, pressure and the like of external hydraulic oil, the angular speed, swing amplitude and frequency change of the vibration rotor are realized. The hydraulic power is converted into mechanical torque, and the mechanical torque forms the power of excitation driving.

Example 3

As shown in fig. 8, this embodiment also provides another excitation driving control method, which is substantially the same as that of embodiment 2, except that:

the step S2 of the excitation driving control method further includes the steps of:

injecting external hydraulic oil into the first cavity; an external hydraulic oil is injected into the second cavity.

The external hydraulic oil is injected into the plurality of tooth top oil cavities and the plurality of tooth root oil cavities which are circumferentially distributed, a hydraulic oil film is formed in a gap between the rotor and the stator, the rotor is supported, contact surfaces of the rotor and the stator are completely separated, friction loss between the rotor and the stator is greatly reduced, a static pressure bearing similar to friction is formed between the rotor and the stator, the stress is more balanced, the back and forth rotation is easier, and the excitation efficiency is improved. The stress at different positions in the circumferential direction can be adjusted by adjusting parameters such as pressure, frequency and the like in the tooth top oil cavity and the tooth root oil cavity, adjustment at corresponding positions is easier to be made according to the abrasion condition between the tooth top oil cavity and the tooth root oil cavity, and the degree of controllability is high.

In other embodiments, depending on the pressure adjustment requirement of the hydrostatic bearing formed between the stator and the rotor, only the first cavity (tooth top oil cavity) or only the second cavity (tooth root oil cavity) may be provided, and not necessarily the stator tooth top oil cavity and the stator tooth root oil cavity are simultaneously provided with oil, so that steps S31 and S32 are not necessarily operated simultaneously, but may be selected or adjusted accordingly according to the actual effect requirement. Alternatively, oil of different pressures is injected into the stator tooth top oil cavity and the stator tooth root oil cavity.

Example 4

As shown in fig. 9, this embodiment also provides another excitation driving control method, which is substantially the same as that of embodiment 3, except that:

the step S2 is preceded by the following steps:

s20, connecting two first cavities which are symmetrical along the circumferential direction in parallel with the same external hydraulic oil source through corresponding first channels; and the two second cavities which are symmetrical along the circumferential direction are communicated with the same external hydraulic oil source in parallel through corresponding second channels.

The two first cavities which are symmetrical along the circumferential direction are communicated with the same external hydraulic oil source in parallel, so that the hydraulic pressures in the two cavities which are symmetrical along the circumferential direction are equal, and the stability and the rigidity of the hydrostatic bearing are greatly improved by adjusting the external hydraulic oil communicated with the two cavities, wherein the rigidity refers to the capability of obtaining the stability.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims

1. An excitation driving device comprises a stator and a rotor, wherein the rotor is provided with a plurality of internal teeth along the circumferential outer surface of the rotor, the stator is provided with a plurality of external teeth along the circumferential inner surface, the excitation driving device is characterized in that,

2. The excitation driving device according to claim 1, wherein the plane is a rectangular plane.

3. The excitation driving device according to claim 1, wherein the rotor and the stator are in clearance fit in a radial direction of the rotor;

4. The excitation driving device according to claim 3,

when a first cavity is arranged between the tooth top of the inner tooth along the radial direction of the rotor and the stator, a first channel is further arranged on the excitation driving device, and two ends of the first channel are communicated with the first cavity and an external hydraulic medium source;

5. The excitation driving device according to claim 4,

when the excitation driving device is provided with first channels, two first channels symmetrically arranged along the circumferential direction are communicated with the same external hydraulic medium source in parallel;

6. The excitation driving device according to claim 1, wherein the number of the external teeth and the number of the internal teeth are each an even number, and the plurality of internal teeth and the plurality of external teeth are each symmetrically arranged in the circumferential direction.

7. The excitation driving device according to claim 1,

third channels are respectively arranged on two sides of each internal tooth along the circumferential direction, and two ends of each third channel are communicated with the tooth holes and an external hydraulic medium source;

8. The excitation driving device according to claim 7, wherein the third passages on both sides of each of the internal teeth in the circumferential direction are provided at both ends of the excitation driving device in the axial direction of the rotor, respectively.

9. The excitation driving device according to claim 7, wherein the stator is further provided with an annular passage in the circumferential direction, the annular passage being provided between the external teeth and the body of the stator;

10. The excitation driving device according to claim 1, further comprising two end caps, the two end caps being respectively and sealingly connected to both ends of the stator in an axial direction of the rotor, and the two end caps being respectively and sealingly connected to circumferential surfaces of the rotor in different axial directions of the rotor.