Excitation drive device and excitation drive control method
By designing the internal teeth as planar structure and static bearings in the vibration driving device, the problems of low hydraulic power conversion efficiency and large friction losses are solved, efficient mechanical torque output and high-precision coordination are achieved, and the sensitivity and life of the vibration driving device are improved.
Patent Information
- Application Number
- CN202211604402.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-13
- Publication Date
- 2025-07-22
AI Technical Summary
The existing vibration driving devices have low hydraulic power conversion efficiency, small mechanical torque, poor response sensitivity, and large friction loss between the rotor and the stator, which affects the working life.
An excitation driving device is designed, with internal teeth provided on the outer surface of the rotor circumferentially, external teeth provided on the inner surface of the stator circumferentially, and the tooth holes are in communication with the external hydraulic medium source. Both sides of the inner teeth are planes. The internal teeth are driven back and forth in the gap cavity through the hydraulic medium to form a mechanical torque, and a static pressing bearing is formed between the rotor and the stator to reduce friction loss.
It improves the hydraulic power conversion efficiency, increases the mechanical torque, improves the accuracy of the mating surface between the rotor and the stator and the static support stiffness, reduces friction losses, and improves the excitation sensitivity and efficiency.
Smart Images
Figure CN120346958A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of machining equipment, and particularly to a vibration excitation driving device and a vibration excitation driving control method. Background Art
[0002] Vibration cutting is a form of machining and has a wide range of applications in machining some irregular structures, materials that are difficult to machine, and precision machining. Such vibration cutting equipment usually includes a vibration excitation driving device such as an electro-hydraulic vibration servo mechanism. There is a rotor and a stator in the electro-hydraulic vibration servo mechanism. The workpiece to be machined is connected to the electro-hydraulic vibration servo mechanism. A hydraulic medium such as hydraulic oil is introduced into the electro-hydraulic vibration servo mechanism at a certain pressure to drive the toothed structure between the rotor and the stator to rotate back and forth at a certain frequency, forming a vibration excitation motion. Thus, hydraulic power with a certain commutation frequency is converted into mechanical torque output. The workpiece to be machined is driven by the electro-hydraulic vibration servo mechanism to perform a vibration excitation motion, and the workpiece is placed in a container filled with semi-liquid abrasive. As a result, the abrasive grains or abrasive blocks in the semi-liquid abrasive rub against the surface of the workpiece in the vibration excitation motion back and forth at a certain frequency, and a cutting effect is generated on the surface of the workpiece.
[0003] However, in the existing vibration excitation driving device, part of the hydraulic power cannot be converted into effective driving force, resulting in a low conversion efficiency of converting hydraulic power into mechanical torque and a small output torque, thus affecting the efficiency of vibration cutting machining and the range of workpieces that can be machined. Using a single-tooth electro-hydraulic vibration servo mechanism, the volume of its vibration excitation oil chamber is relatively large, and the response sensitivity of the vibration excitation motion is poor. The friction loss between the rotor and the stator of the electro-hydraulic vibration servo mechanism is large, affecting the working life. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a vibration excitation driving device and a vibration excitation driving control method.
[0005] The present invention solves the above technical problem through the following technical solutions:
[0006] A vibration excitation driving device, the vibration excitation driving device includes a stator and a rotor. A plurality of internal teeth are provided on the outer surface of the rotor along the circumferential direction of the rotor. A plurality of external teeth are provided on the inner surface of the stator along the circumferential direction.
[0007] The gap between two adjacent external teeth forms a tooth hole, and the internal teeth are arranged in the tooth hole. The tooth hole is communicated with an external hydraulic medium source.
[0008] The width of the tooth hole along the circumferential direction is greater than the width of the internal teeth. The two side surfaces of the internal teeth along the circumferential direction and facing the external teeth are planes.
[0009] In this solution, through the above settings, the internal teeth and external teeth are arranged alternately in the circumferential direction and cooperate with each other, so that clearance cavities required for rotational motion are formed on both sides of the internal teeth. When the hydraulic medium is alternately injected into the clearance cavities on both sides, the internal teeth are driven to rotate back and forth within a small range at a certain frequency in the clearance cavities, so as to convert hydraulic power into mechanical torque, and this mechanical torque constitutes the power of the vibration excitation drive. The internal teeth adopt a planar structure along the circumferential direction and towards the two side surfaces of the external teeth. Compared with other non-planar structures, the acting directions of the hydraulic medium on the plane at each point on the plane are all consistent with the rotation direction of the internal teeth and are all converted into effective driving forces. Therefore, the effective driving force area on the side surface is large, increasing the mechanical torque and improving the conversion efficiency. At the same time, through the above planar structure, the shape of the internal teeth is regular, so it is easier to achieve a high-precision surface for the internal teeth and the rotor body through separate machining, reducing the machining difficulty. After separate machining, they are then embedded and assembled. Such a separate machining method improves the fitting accuracy of the mating surface where the rotor rotates relative to the stator (the root circle surface of the internal teeth and the tip circle surface of the external teeth), thereby enhancing its hydrostatic support stiffness (hydrostatic support means that the static pressure generated by hydraulic oil acts on the root circle surface of the internal teeth to separate the rotor from the stator so that the rotor can rotate; and hydrostatic support stiffness means the ability of the support to enable the rotor to rotate smoothly under static pressure), and also makes it easier to achieve a small clearance structure on both sides of the internal teeth, improving its corresponding vibration excitation sensitivity.
[0010] Preferably, the plane is a rectangular plane.
[0011] In this solution, the internal teeth adopt a rectangular plane structure along the circumferential direction and towards the two side surfaces of the external teeth, that is, the internal teeth are rectangular teeth. The rectangular plane structure makes the structure of the internal teeth simpler and the shape more regular. Not only is it easy to improve the machining accuracy of each surface of each internal tooth, but also in the case of separate machining of the internal teeth and the rotor body, multiple internal teeth can be arranged side by side and machined as a whole, so that the surfaces of each internal tooth all obtain consistent high precision, enhancing the consistency effect of high precision, thereby improving the assembly accuracy of each surface of the rotor and other components.
[0012] Preferably, there is a clearance fit between the rotor and the stator along the radial direction of the rotor;
[0013] A first cavity is provided between the tip of the internal teeth and the stator along the radial direction of the rotor, and the first cavity is communicated with an external hydraulic medium source; and / or, a second cavity is provided between the tip of the external teeth and the rotor along the radial direction of the rotor, and the second cavity is communicated with an external hydraulic medium source.
[0014] In this solution, a hydraulic medium is injected into the clearance cavity between the rotor and the stator to form a hydraulic medium film. The hydraulic medium is also injected into a plurality of first cavities and / or a plurality of second cavities distributed circumferentially. The static pressure of the hydraulic medium lifts the rotor, and the contact surfaces of the two (the rotor and the stator) are completely separated, greatly reducing the frictional loss between them. An approximately frictionless hydrostatic bearing is formed between them (that is, a hydrostatic bearing refers to a bearing structure composed of a medium cavity between a rotating rotor and a stationary stator, and the static pressure generated by the hydraulic medium is used to support the frictionless rotation of the bearing structure). The force is more balanced, and it is easier to rotate back and forth, improving the excitation efficiency. Moreover, by injecting the hydraulic medium into the first cavity, it is possible to prevent the hydraulic medium from flowing from one side of the internal teeth to the other side, avoiding weakening the driving force of the hydraulic medium on the internal teeth. By adjusting parameters such as the pressure and frequency of the first cavity or the second cavity at different positions in the circumferential direction, the forces at different positions in the circumferential direction can be adjusted, and it is easier to make corresponding adjustments at the corresponding positions according to the wear conditions between the two, with a high degree of controllability.
[0015] Preferably, when a first cavity is provided between the tip of the internal teeth and the stator along the radial direction of the rotor, a first channel is further provided on the excitation driving device, and both ends of the first channel communicate with the first cavity and an external hydraulic medium source;
[0016] When a second cavity is provided between the tip of the external teeth and the rotor along the radial direction of the rotor, a second channel is further provided on the excitation driving device, and both ends of the second channel communicate with the second cavity and an external hydraulic medium source.
[0017] In this solution, through the first channel and the second channel with the above structures, external hydraulic medium is provided to the corresponding first cavity and second cavity.
[0018] Preferably, when a first channel is provided on the excitation driving device, two first channels symmetrically arranged along the circumferential direction are connected in parallel to the same external hydraulic medium source;
[0019] When a second channel is provided on the excitation driving device, two second channels symmetrically arranged along the circumferential direction are connected in parallel to the same external hydraulic medium source.
[0020] In this solution, through the above parallel connection structure, the hydraulic pressures in two circumferentially symmetric channels (the first channel and the second channel) are equal, and it is easy to achieve constant pressure. By adjusting the external hydraulic medium connected to the two channels, the stability and stiffness of the hydrostatic bearing are greatly improved, where stiffness refers to the ability to obtain stability.
[0021] Preferably, the number of the external teeth and the internal teeth is even, and a plurality of the internal teeth and a plurality of the external teeth are symmetrically arranged along the circumferential direction respectively.
[0022] In this solution, an even number of internal teeth and external teeth are adopted and symmetrically arranged along the circumferential direction respectively to form a pairwise symmetry mode, further improving the force balance of the rotor.
[0023] Preferably, third channels are respectively arranged on both sides of each internal tooth along the circumferential direction, and both ends of the third channels communicate with the tooth holes and an external hydraulic medium source;
[0024] Among the third channels on both sides of each internal tooth along the circumferential direction, the setting direction of at least one third channel is different from the setting direction of the internal tooth.
[0025] In this solution, through the third channels with the above structure, an external hydraulic driving force is provided for the internal teeth; by setting the direction of at least one third channel to be different from the setting direction of the internal tooth, the hydraulic medium in the third channel flows to and impacts the side surface of the internal tooth to drive the internal tooth to rotate; the formed flow setting is beneficial to reducing the flow resistance of the hydraulic medium. By adjusting parameters such as the pressure and frequency of the third channels on both sides of the internal tooth, the internal tooth can generate the same or different vibration effects in the clockwise and counterclockwise directions respectively, and the excitation processing has a wide applicable range.
[0026] Preferably, the third channels on both sides of each internal tooth along the circumferential direction are respectively arranged at both ends of the excitation driving device along the axial direction of the rotor.
[0027] In this solution, through the third channels arranged with the above structure, the driving forces on both sides of the internal tooth are distributed at both ends of the excitation driving device along the axial direction instead of the same end, dispersing the arrangement of the two third channels, which is easy to process.
[0028] 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;
[0029] Each third channel communicates with the annular channel, and the annular channel communicates with an external hydraulic medium source.
[0030] In this solution, by communicating each third channel with the annular channel, each internal tooth can obtain the same hydraulic power, which is beneficial to the force balance on the outer circumferential surface of the rotor, easy to rotate, and improves the excitation efficiency.
[0031] Preferably, the excitation driving device further includes two end covers, and the two end covers are hermetically connected to both ends of the stator along the axial direction of the rotor respectively, and the two end covers are hermetically connected to the circumferential surface of the rotor along directions different from the axial direction of the rotor respectively.
[0032] In this solution, through the above two sealing connections in different directions, the sealing effect of the excitation drive device in different direction combinations is ensured, hydraulic power loss is avoided, and it is beneficial to the conversion efficiency of hydraulic power.
[0033] An excitation drive control method, the excitation drive control method uses the above excitation drive device to generate excitation motion, and the excitation drive control method includes the following steps:
[0034] Connect the rotor to the workpiece to be machined;
[0035] Inject an external hydraulic medium into the tooth holes alternately from both sides of the inner tooth along the circumferential direction to drive the inner tooth to move back and forth in the circumferential direction.
[0036] In this solution, the excitation drive control method uses the above excitation drive device and through the above method, the hydraulic power drives the inner tooth to rotate back and forth in a small range in the clearance cavity on both sides of the inner tooth, thereby driving the rotor to rotate back and forth relative to the stator, generating an excitation effect. By controlling parameters such as the frequency and pressure of the external hydraulic medium, the angular velocity, swing amplitude, and frequency change of the vibrating rotor are achieved. The conversion of hydraulic power into mechanical torque is realized, and this mechanical torque constitutes the power of the excitation drive.
[0037] Preferably, there is a clearance fit between the rotor and the stator along the radial direction of the rotor;
[0038] When there is a first cavity between the tooth tip of the inner tooth and the stator along the radial direction of the rotor, the excitation drive control method further includes the following step: injecting an external hydraulic medium into the first cavity;
[0039] When there is a second cavity between the tooth tip of the outer tooth and the rotor along the radial direction of the rotor, the excitation drive control method further includes the following step: injecting an external hydraulic medium into the second cavity.
[0040] In this solution, by using the above structural settings, by injecting an external hydraulic medium into a plurality of first cavities and / or a plurality of second cavities distributed circumferentially, a hydraulic medium film is formed in the clearance between the rotor and the stator, lifting the rotor, and the contact surfaces of the two (the rotor and the stator) are completely separated, greatly reducing the friction loss between the two. An approximately frictionless hydrostatic bearing is formed between the two, with more balanced stress, easier back-and-forth rotation, and improved excitation efficiency. By adjusting parameters such as the pressure and frequency in the first cavity and the second cavity, the force at different positions in the circumferential direction can be adjusted, and it is easier to make corresponding adjustments at the corresponding positions according to the wear conditions between the two, with a high degree of controllability.
[0041] Preferably, its characteristics are that,
[0042] Before the step of "injecting external hydraulic medium into the first cavity", the following steps are further included: connecting two symmetric first cavities in parallel to the same external hydraulic medium source along the circumferential direction;
[0043] Before the step of "injecting external hydraulic medium into the second cavity", the following steps are further included: connecting two symmetric second cavities in parallel to the same external hydraulic medium source along the circumferential direction.
[0044] In this solution, by connecting two symmetric first cavities in parallel to the same external hydraulic medium source along the circumferential direction, the hydraulic pressures in the two circumferentially symmetric cavities are made equal, and by adjusting the external hydraulic medium connected to the two cavities, the stability and stiffness of the hydrostatic bearing are greatly improved. Here, stiffness refers to the ability to obtain stability.
[0045] The positive and progressive effects of the present invention are as follows: in the excitation drive device and the excitation drive control method of the present invention, when the hydraulic medium is alternately injected into the clearance cavities on both sides of the internal gear, the internal gear is driven to rotate back and forth within a small range at a certain frequency (clockwise or counterclockwise rotation) in the clearance cavities, realizing the conversion of hydraulic power into mechanical torque, and this mechanical torque constitutes the power of the excitation drive. The internal gear adopts a planar structure along the circumferential direction and towards the two side surfaces of the external gear. Compared with other non-planar structures, the driving force directions of the hydraulic medium on each point of the plane are all consistent with the rotation direction of the internal gear, and the effective driving force area on the side surface is large, increasing the mechanical torque and improving the conversion efficiency. At the same time, through the above planar structure, the shape of the internal gear is regular, so it is easier to achieve a high-precision surface for the internal gear and the rotor body through split machining, reducing the processing difficulty. After split machining, they are embedded and assembled. Such a split machining method improves the fitting accuracy of the mating surface (the root circle surface of the internal gear and the tip circle surface of the external gear) where the rotor rotates relative to the stator, thereby enhancing its hydrostatic support stiffness, and also making it easier to achieve a small clearance structure on both sides of the internal gear, improving its corresponding excitation sensitivity. Description of the Drawings
[0046] Figure 1 It is a schematic structural diagram of the A end face of the excitation drive device according to Embodiment 1 of the present invention (where the upper half is the internal structural diagram after removing the end cover).
[0047] Figure 2 It is a schematic internal structural diagram of the B end face of the excitation drive device according to Embodiment 1 of the present invention after removing the cover.
[0048] Figure 3 is Figure 1 a sectional view along points C1 - D1 - E1.
[0049] Figure 4a It is a schematic structural diagram of the rotor body according to Embodiment 1 of the present invention.
[0050] Figure 4b is Figure 4a The sectional view along points C2 - D2 - E2 in
[0051] Figure 5a The sectional view of the internal teeth of Embodiment 1 of the present invention Figure 1 .
[0052] Figure 5b The sectional view of the internal teeth of Embodiment 1 of the present invention from another angle Figure 2 .
[0053] Figure 6a The structural schematic diagram of the stator of Embodiment 1 of the present invention.
[0054] Figure 6b is Figure 6a The sectional view along points C3 - D3 - E3 in
[0055] Figure 7 The flow chart of the excitation drive control method of Embodiment 2 of the present invention.
[0056] Figure 8 The flow chart of the excitation drive control method of Embodiment 3 of the present invention.
[0057] Figure 9 The flow chart of the excitation drive control method of Embodiment 4 of the present invention.
[0058] Explanation of reference numerals:
[0059] Excitation drive device 1, electro - hydraulic excitation servo mechanism 10,
[0060] End cover 2, O - ring seal groove 21,
[0061] Stator 3, external teeth 31, tooth holes 32, stator body 33, top - circle surface 34,
[0062] Rotor 4, internal teeth 41, plane 42, rotor body 43, root - circle surface 44, internal tooth groove 45, mounting hole 46,
[0063] Annular channel 5, annular oil groove 50,
[0064] Third channel 6, inclined oil groove 60,
[0065] First cavity 7, tooth - tip oil cavity 70,
[0066] Second cavity 8, tooth - root oil cavity 80,
[0067] First channel 9, tooth - tip static - pressure oil passage 90,
[0068] Second channel 11, tooth - root static - pressure oil passage 110,
[0069] The circumferential direction F of the rotor, the axial direction G of the rotor, and the radial direction H of the rotor. Specific embodiments
[0070] The present invention will be further described below by way of examples, but the present invention is not limited to the scope of the described examples.
[0071] Example 1
[0072] As Figure 1 - As shown in FIG. 6, this embodiment provides an excitation driving device 1, which is specifically an electro-hydraulic excitation servo mechanism 10, including a stator 3, a rotor 4, and two circular end covers 2. The electro-hydraulic excitation servo mechanism 10 includes two end faces along the axial direction G of the rotor 4, namely an A end face and a B end face. The rotor 4 is installed in the inner ring of the stator 3. The center of the end cover 2 is a through hole. The two end covers 2 are respectively covered on the end faces of the stator 3 at the A end face and the B end face, and are sleeved on the circumferential surfaces at both ends of the rotor 4.
[0073] The workpiece to be vibration-processed is connected to one end of the rotor 4 extending along its axial direction G (not shown in the figure). The workpiece is placed in a container filled with semi-liquid abrasive, and there are abrasive grains or abrasive blocks for grinding the surface of the workpiece in the semi-liquid abrasive.
[0074] A plurality of internal teeth 41 are inlaid on the outer surface of the rotor 4 along the circumferential direction F of the rotor 4. A plurality of external teeth 31 are machined on the inner surface of the stator 3 along the circumferential direction F. The gap between two adjacent external teeth 31 forms 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 this embodiment is oil. In other embodiments, the hydraulic medium can also be a suitable liquid material other than oil. The oil source communicated with the tooth hole 32 is the first oil source. Among them, the internal and external relationships in the naming of the internal teeth 41 and the external teeth 31 are relative to the internal and external ring relationships of the rotor and the stator. For the rotor 4 itself, since the internal teeth 41 are embedded on the outer surface of the rotor 4, in terms of mechanical structure, the internal teeth 41 are also the external teeth of the rotor.
[0075] The width of the tooth hole 32 along the circumferential direction F is greater than the width of the internal teeth 41, so that the tooth hole 32 forms a clearance cavity required for rotational motion on both sides of the internal teeth 41. The two side surfaces of the internal teeth 41 along the circumferential direction F and facing the external teeth 31 are flat surfaces 42.
[0076] With the above structure, the inner teeth 41 and the outer teeth 31 are arranged alternately in the circumferential direction F and cooperate with each other. When the oil from the first oil source is alternately injected into the gap cavities on both sides of the inner teeth 41, the inner teeth 41 of the rotor 4 are driven to rotate back and forth within a small range at a certain frequency (clockwise or counterclockwise rotation) in the gap cavities, forming an exciting motion, realizing the conversion of hydraulic power into mechanical torque, and this mechanical torque constitutes the power for exciting drive. The electro-hydraulic exciting servo mechanism 10 drives the workpiece to perform an exciting motion, so that the workpiece and the grinding material rub against each other back and forth at a certain frequency, producing a cutting effect on the surface of the workpiece.
[0077] The inner teeth 41 adopt a planar structure along the circumferential direction F and towards the two side surfaces of the outer teeth 31. Compared with other non-planar structures (for example, the traditional tooth profile structure, whose side surface is an involute surface, a non-regular planar structure), the direction of the force exerted by the hydraulic oil on the plane 42 at each point on this plane 42 is consistent with the rotation direction of the inner teeth 41, and all the forces at each point can be completely converted (instead of partially converted) into effective driving forces. Then, the area of the effective driving force on the side surface is large, increasing the output mechanical torque and improving the conversion efficiency. For the traditional tooth profile structure, since its side surface is an involute surface, on this involute surface, the direction of the force exerted by the hydraulic oil at all points is not consistent with the rotation direction of the inner teeth 41, but the direction of the force at some points has an inclination angle with the rotation direction of the inner teeth 41. Then, only the forces (components) that are consistent with the rotation direction constitute the effective driving forces. In such a case, the area of the effective driving force on the side surface of the involute teeth is small, reducing the output mechanical torque and thus being unfavorable for the conversion efficiency.
[0078] And, as Figure 1As shown in Fig. -6, since the two side surfaces of the internal teeth 41 adopt the above-mentioned planar structure, their shapes are regular and no longer the irregular curved surfaces (such as involute curved surfaces) of traditional teeth. Therefore, the internal teeth 41 and the rotor body 43 can be separately processed, that is, multiple internal teeth 41 are processed separately, and the body 43 is also processed separately. Then, the internal teeth 41 are embedded into the internal tooth grooves 45 of the body 43, and the screws are screwed into the mounting holes 46 of the internal teeth 41 and fixedly assembled on the body 43. In this way of separate processing, since the side surfaces of the internal teeth 41 are regular planar structures, it is easier to achieve high-precision surfaces on both their side surfaces and top surfaces. And the surface of the body 43 (which is the root circle surface 44 of the internal teeth 41 after assembly) is a continuous regular cylindrical surface (if not processed separately, the surface is a discontinuous regular cylindrical surface), and it is easy to obtain a high-precision surface through continuous processing. The top circle surface 34 of the external teeth 31 can also obtain a high-precision surface through continuous processing. Thus, the mating surface (the root circle surface 44 of the internal teeth 41 of the rotor 4 and the top circle surface 34 of the external teeth 31 of the stator 3) for the rotor to rotate relative to the stator has improved mating accuracy, thereby enhancing its hydrostatic support stiffness (hydrostatic support means that the static pressure generated by hydraulic oil acts on the root circle surface 44 of the internal teeth, separating the rotor 4 from the stator 3 so that the rotor 4 can rotate; and hydrostatic support stiffness refers to the ability to support the rotor 4 to rotate smoothly under static pressure).
[0079] The electro-hydraulic excitation servo mechanism 10 adopts a multi-tooth structure. Compared with a single-tooth structure or a structure with fewer teeth, it increases the torque output and has a compact structure. It also makes it easier to achieve a small clearance structure on both sides of the internal teeth, which can improve the corresponding excitation sensitivity.
[0080] Among them, the plane 42 is specifically manufactured as a rectangular plane, so the internal teeth 41 are rectangular teeth. Using rectangular teeth, the structure is simple and the shape is more regular. Not only is it easy to improve the machining accuracy of each surface of each internal tooth 41; moreover, in the case of separate processing of the internal teeth 41 and the rotor body 43, multiple internal teeth 41 can be arranged side by side and processed as a whole (for example, multiple internal teeth are processed as a whole at the same time, and then each internal tooth is separated). In this way, the surfaces of each internal tooth 41 all obtain consistent high precision, enhancing the consistency effect of high precision, thereby improving the assembly accuracy of each surface of the rotor 4 with other components.
[0081] Of course, the shape of the plane 42 is not limited to a rectangle. As long as the plane is a planar structure, its shape can be manufactured into other shapes according to the actual mating requirements.
[0082] Such as Figure 1 and Figure 2As shown, there is a clearance fit between the rotor 4 and the stator 3 along the radial direction H of the rotor 4, and hydraulic oil from a first oil source is injected into this clearance to form a hydraulic oil film. A first cavity 7 is provided between the tip of each internal tooth 41 and the stator 3 along the radial direction H, which is the tip oil cavity 70 of the rotor 4, and the tip oil cavity 70 is communicated with an external second oil source. A second cavity 8 is provided between the tip of each external tooth 31 and the rotor 4 along the radial direction H, which is the root oil cavity 80 of the rotor 4, and the root oil cavity 80 is communicated with an external second oil source.
[0083] With the above structural arrangement, when the multiple tip oil cavities 70 and multiple root oil cavities 80 distributed circumferentially F are injected with oil from the second oil source, the static pressure of the hydraulic oil lifts the rotor 4, and the contact surfaces of the two (the rotor 4 and the stator 3) are completely separated, greatly reducing the frictional loss between them. An approximately frictionless hydrostatic bearing is formed between them (that is, a hydrostatic bearing refers to a bearing structure composed of a rotating rotor 4 and a stationary stator 3, and the static pressure generated by the hydraulic oil is used to support the frictionless rotation of this bearing structure). The force is more balanced, and it is easier to rotate back and forth, improving the excitation efficiency. Moreover, injecting the oil from the second oil source into the tip oil cavity 70 can prevent the oil from the first oil source from flowing from one side of the internal tooth 41 to the other side in the clearance between the stator 3 and the rotor 4, avoiding weakening the driving force of the oil from the first oil source on the internal tooth 41. Because if the oil from the first oil source can flow from one side of the internal tooth 41 to the other side, part of the oil from the first oil source will offset the driving force on the opposite side from the other side. In this embodiment, the first oil source is the power oil source for driving the excitation of the rotor 4, and its pressure is relatively high, 25 - 31 Mpa; while the second oil source is the hydrostatic oil source (with a constant pressure) required to form a hydrostatic bearing between the stator 3 and the rotor 4, and its pressure is relatively low, 15 - 21 Mpa. Of course, in other embodiments, the pressure magnitudes of the two oil sources can be adjusted accordingly according to the needs of the excitation effect, and the two oil sources can also be the same oil source, and the oil is distributed to the oil cavities at different positions through oil valves and pipelines.
[0084] In addition, by adjusting parameters such as the pressure and frequency of the tip oil cavity 70 or the root oil cavity 80 at different positions in the circumferential direction F, the forces at different positions in the circumferential direction F can be adjusted, and it is easier to make corresponding adjustments at the relative positions according to the wear conditions between the two, with a high degree of controllability.
[0085] Such as Figures 1 - 3As shown, a first channel 9 and a second channel 11 are also provided on the stator 3 of the electro-hydraulic vibration servo mechanism 10. The first channel 9 is a tooth tip static pressure oil channel 90, and the tooth tip static pressure oil channel 90 horizontally passes through the stator 3 to connect the tooth tip oil cavity 70 with an external second oil source. The second channel 11 is a tooth root static pressure oil channel 110. Similarly, the tooth root static pressure oil channel 110 also horizontally passes through the stator 3 to connect the tooth root oil cavity 80 with an external second oil source, providing external hydraulic oil for the tooth tip oil cavity 70 and the tooth root oil cavity 80. In other embodiments, according to the different specific structural shapes of the motor, the first channel 9 and the second channel 11 may also be provided on other structural components of the electro-hydraulic vibration servo mechanism, and their specific installation positions are adjusted accordingly according to the specific structure of the electro-hydraulic vibration servo mechanism. In other embodiments, according to the pressure adjustment requirements for forming a static pressure bearing between the stator 3 and the rotor 4, there may be only the first cavity 7 (tooth tip oil cavity 70) or only the second cavity 8 (tooth root oil cavity 80), and correspondingly, there are only the first channel 9 (tooth tip static pressure oil channel 90) and the second channel 11 (tooth root static pressure oil channel 110), and it is not necessarily the case that there is oil in both the tooth tip oil cavity 70 of the stator 3 and the tooth root oil cavity 80 of the stator 3 at the same time. Or, oils with different pressures are injected into the tooth tip oil cavity 70 of the stator 3 and the tooth root oil cavity 80 of the stator 3.
[0086] Among them, two first channels 9 symmetrically arranged along the circumferential direction F are connected in parallel to the same external oil source, and two second channels 11 symmetrically arranged along the circumferential direction F are connected in parallel to the same external oil source. Thus, multiple pairs of first channels 9 and second channels 11 connected in parallel are formed at different positions in the circumferential direction F of the stator 3. The hydraulic pressures in each pair of channels (the first channel 9 and the second channel 11) symmetric about the circumferential direction F are equal, and it is easy to achieve constant pressure; by adjusting the external hydraulic oil connected to the two channels, the stability and stiffness of the static pressure bearing are greatly improved, where the stiffness refers to the ability to obtain stability.
[0087] As Figure 2 shown, the numbers of the external teeth 31 and the internal teeth 41 are both even, and multiple internal teeth 41 and multiple external teeth 31 are symmetrically arranged along the circumferential direction F respectively. By using an even number of internal teeth 41 and external teeth 31 and symmetrically arranging them along the circumferential direction F respectively to form a pairwise symmetry method, the force balance of the rotor 4 is further improved, and the symmetric tooth profile structure is easy to process.
[0088] As Figure 2 and Figure 3 shown, the stator 3 is also provided with an annular channel 5 along the circumferential direction F. In this embodiment, the annular channel 5 is specifically an annular oil groove 50, and the annular oil groove 50 is connected to an external first oil source.
[0089] An annular oil groove 50 is provided between the external teeth 31 and the body 33 of the stator. Third channels 6 are respectively provided on both sides of each internal tooth 41 along the circumferential direction F. In this embodiment, the third channel 6 is an inclined oil groove 60. The inclined oil grooves 60 on both sides of each internal tooth 41 are inclined at a certain angle with respect to the setting direction of the internal tooth 41. Both ends of the inclined oil groove 60 communicate with the tooth holes 32 and the annular oil groove 50. Through the third channel 6, an external hydraulic driving force is provided for the internal tooth 41.
[0090] The hydraulic oil in the inclined oil groove 60 flows towards and impacts the side surface of the internal tooth 41, driving the internal tooth 41 to rotate; the formed flow setting is conducive to reducing the flow resistance of the hydraulic oil. By adjusting parameters such as the pressure and frequency of the inclined oil grooves 60 on both sides of the internal tooth 41, the internal tooth 41 can generate the same or different vibration effects in the clockwise and counterclockwise directions respectively, and the excitation processing has a wide range of adaptability.
[0091] Moreover, in the circumferential direction, each inclined oil groove 60 communicates with the annular oil groove 50, so that each internal tooth 41 can obtain the same hydraulic power, which is conducive to the balanced force on the outer peripheral surface of the rotor 4, easy rotation, and improved excitation efficiency.
[0092] Among them, the two inclined oil grooves 60 on both sides of each internal tooth 41 are respectively arranged on the A end face and the B end face, distributing the driving forces on both sides of the internal tooth 41 at both ends of the electro-hydraulic vibration servo mechanism 10 instead of the same end, dispersing the structural arrangement of the two third channels 6, and being easy to machine.
[0093] As Figure 3 shown, the two end covers 2 and the two ends of the stator 3 are hermetically connected axially G through the O-ring in the O-ring groove 21, and the two end covers 2 and the circumferential surface of the rotor 4 are hermetically connected radially H through the O-ring in another O-ring groove 21. The hermetic connections between the end covers 2 and the stator 3 and the rotor 4 are arranged in different directions, ensuring the sealing effect of the electro-hydraulic vibration servo mechanism 10 in different direction fittings, avoiding hydraulic power loss, and being conducive to the conversion efficiency of hydraulic power. In other embodiments, the hermetic connections between the end covers 2 and the stator 3 and the rotor 4 are not necessarily in the axial G and radial H of a perpendicular relationship, and can also be adjusted accordingly according to the specific shape and structure of the stator 3 and the rotor 4.
[0094] Embodiment 2
[0095] As Figure 7 shown, this embodiment also provides an excitation drive control method. This excitation drive control method uses the electro-hydraulic vibration servo mechanism of Embodiment 1 to generate an excitation motion. This excitation drive control method includes the following steps:
[0096] S1, connecting the rotor to the workpiece to be processed;
[0097] S2. Inject external hydraulic oil into the tooth holes alternately from both circumferential sides of the internal teeth to drive the internal teeth to move back and forth circumferentially.
[0098] This excitation drive control method utilizes the above electro-hydraulic excitation servo mechanism, and through the above method, hydraulic power drives the internal teeth to rotate back and forth within a small range in the clearance cavities on both sides of the internal teeth, thereby driving the rotor to rotate back and forth relative to the stator, generating an excitation effect. By controlling parameters such as the frequency and pressure of the external hydraulic oil, the angular velocity, swing amplitude, and frequency change of the vibrating rotor are achieved. The conversion of hydraulic power into mechanical torque is realized, and this mechanical torque constitutes the power of the excitation drive.
[0099] Embodiment 3
[0100] As Figure 8 shown, this embodiment also provides another excitation drive control method. This embodiment is basically the same as the excitation drive control method of Embodiment 2, except that:
[0101] Step S2 of this excitation drive control method further includes the following steps:
[0102] Inject external hydraulic oil into the first cavity; inject external hydraulic oil into the second cavity.
[0103] By injecting external hydraulic oil into a plurality of tooth tip oil cavities and a plurality of tooth root oil cavities distributed circumferentially, a hydraulic oil film is formed in the gap between the rotor and the stator, lifting the rotor, and the contact surfaces of the two (the rotor and the stator) are completely separated, greatly reducing the frictional loss between the two. An approximately frictionless hydrostatic bearing is formed between the two, with more balanced force, easier back-and-forth rotation, and improved excitation efficiency. By adjusting parameters such as the pressure and frequency in the tooth tip oil cavity and the tooth root oil cavity, the force at different circumferential positions can be adjusted, and it is easier to make corresponding adjustments at the corresponding positions according to the wear condition between the two, with a high degree of controllability.
[0104] In other embodiments, according to the pressure adjustment requirements for forming a hydrostatic bearing between the stator and the rotor, there may be only the first cavity (tooth tip oil cavity) or only the second cavity (tooth root oil cavity), rather than necessarily having oil in both the stator tooth tip oil cavity and the stator tooth root oil cavity at the same time. That is, it is not necessary to operate steps S31 and S32 simultaneously, but corresponding selection or adjustment can be made according to the actual effect requirements. Or, inject oils with different pressures into the stator tooth tip oil cavity and the stator tooth root oil cavity.
[0105] Embodiment 4
[0106] As Figure 9 shown, this embodiment also provides another excitation drive control method. This embodiment is basically the same as the excitation drive control method of Embodiment 3, except that:
[0107] Before step S2, the following steps are further included:
[0108] S20. Connect two first cavities that are circumferentially symmetric in parallel to the same external hydraulic oil source through corresponding first channels; connect two second cavities that are circumferentially symmetric in parallel to the same external hydraulic oil source through corresponding second channels.
[0109] By connecting two first cavities that are circumferentially symmetric in parallel to the same external hydraulic oil source, the hydraulic pressures in the two circumferentially symmetric cavities are made equal, and by adjusting the external hydraulic oil connected to the two cavities, the stability and stiffness of the hydrostatic bearing are greatly improved. Here, stiffness refers to the ability to obtain stability.
[0110] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example. The protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. An excitation driving device, the excitation driving device includes a stator and a rotor, several internal teeth are provided on the outer surface of the rotor along the circumferential direction of the rotor, and several external teeth are provided on the inner surface of the stator along the circumferential direction, and it is characterized in that, 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 hole along the circumferential direction is greater than the width of the internal teeth, and the two side surfaces of the internal teeth along the circumferential direction and facing the external teeth are flat surfaces.
2. The excitation drive device according to claim 1, wherein The flat surface is a rectangular flat surface.
3. The excitation driving device according to claim 1, characterized in that, There is a clearance fit between the rotor and the stator along the radial direction of the rotor; A first cavity is provided between the tooth tip of the internal teeth and the stator along the radial direction of the rotor, and the first cavity is communicated with an external hydraulic medium source; and / or, a second cavity is provided between the tooth tip of the external teeth and the rotor along the radial direction of the rotor, and the second cavity is communicated with an external hydraulic medium source.
4. The excitation driving device according to claim 3, characterized in that, When a first cavity is provided between the tooth tip of the internal teeth and the stator along the radial direction of the rotor, a first channel is further provided on the excitation driving device, and both ends of the first channel are communicated with the first cavity and an external hydraulic medium source; When a second cavity is provided between the tooth tip of the external teeth and the rotor along the radial direction of the rotor, a second channel is further provided on the excitation driving device, and both ends of the second channel are communicated with the second cavity and an external hydraulic medium source.
5. The excitation driving device according to claim 4, characterized in that, When a first channel is provided on the excitation driving device, two first channels symmetrically arranged along the circumferential direction are connected in parallel to the same external hydraulic medium source; When a second channel is provided on the excitation driving device, two second channels symmetrically arranged along the circumferential direction are connected in parallel to the same external hydraulic medium source.
6. The excitation driving device according to claim 1, characterized in that The number of the external teeth and the internal teeth are both even, and multiple internal teeth and multiple external teeth are symmetrically arranged along the circumferential direction respectively.
7. The excitation driving device according to claim 1, characterized in that, Each of the internal teeth is provided with a third channel on both sides along the circumferential direction, and both ends of the third channel are communicated with the tooth hole and an external hydraulic medium source; Among the third channels on both sides of each internal tooth along the circumferential direction, the setting direction of at least one third channel is different from the setting direction of the internal teeth.
8. The excitation driving device according to claim 7, characterized in that, The third channels on both sides of each internal tooth along the circumferential direction are respectively arranged at both ends of the excitation driving device along the axial direction of the rotor.
9. The excitation drive device according to claim 7, characterized in that, 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 of the third channels is communicated with the annular channel, and the annular channel is communicated with an external hydraulic medium source.
10. The excitation driving device according to claim 1, characterized in that, The excitation driving device further includes two end covers, the two end covers are hermetically connected to both ends of the stator along the axial direction of the rotor respectively, and the two end covers are hermetically connected to the circumferential surface of the rotor along different directions from the axial direction of the rotor respectively.
11. An excitation drive control method, characterized in that, The excitation drive control method uses the excitation drive device as described in any one of claims 1-10 to generate an excitation motion, and the excitation drive control method includes the following steps: Connect the rotor to the workpiece to be machined; Inject an external hydraulic medium into the tooth holes alternately from both sides of the inner teeth along the circumferential direction to drive the inner teeth to move back and forth in the circumferential direction.
12. The excitation drive control method according to claim 11, characterized in that, There is a clearance fit between the rotor and the stator along the radial direction of the rotor; When there is a first cavity between the tooth tip of the inner teeth and the stator along the radial direction of the rotor, the excitation drive control method further includes the following steps: injecting an external hydraulic medium into the first cavity; When there is a second cavity between the tooth tip of the outer teeth and the rotor along the radial direction of the rotor, the excitation drive control method further includes the following steps: injecting an external hydraulic medium into the second cavity.
13. The excitation drive control method according to claim 12, wherein Before the step of "injecting an external hydraulic medium into the first cavity", the following steps are further included: connecting two symmetric first cavities in parallel to the same external hydraulic medium source along the circumferential direction; Before the step of "injecting an external hydraulic medium into the second cavity", the following steps are further included: connecting two symmetric second cavities in parallel to the same external hydraulic medium source along the circumferential direction.