Linear rotation impact motor

Abstract

The invention discloses a linear rotation impact motor, and relates to the technical field of motors. The motor specifically comprises a machine shell, a stator part and a rotor part, the stator part is installed on the inner wall of the machine shell and comprises a stator iron core, an annular winding and a permanent magnet which are arranged in the circumferential direction; the mover piece is arranged at the circle center of the stator piece and comprises a motor shaft which performs composite motion with the shell, a mover yoke part which is fixed outside the motor shaft and is positioned at the circle center of the stator piece, and a mover iron pole which is arranged on the outer wall of the mover yoke part; the direct-current rotating motor is adopted to replace an original down-hole hammer, the magnetizing directions of the permanent magnets arranged in the circumferential direction are the same, the magnetizing directions of the adjacent permanent magnets arranged in the axial direction are opposite, a magnetism gathering structure is formed, the impact force / torque density of the motor is improved, the impact capacity on hard rocks is enhanced, a hydraulic system mode is not needed, and the cost is reduced. And meanwhile, independent control and stable operation of linear impact, rotation and rotary impact motion of the motor are realized by controlling the annular winding.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a linear rotary impact motor. Background Art

[0002] Impact motor is a kind of electric tool, its working principle is mainly based on the dual effect of high-speed rotation of the motor and impact force to achieve drilling operation. When this kind of motor is working, it will continuously exert impact force, thereby accelerating the drilling speed and improving the drilling efficiency.

[0003] At present, for mining, down-the-hole impactor is an important rock drilling equipment, which can complete drilling operations such as blastholes and auxiliary holes in open-pit or underground mines. In recent years, impact rotary drilling has integrated the functions of rotary drilling and impact drilling, which can significantly improve the drilling efficiency and become an effective means of mining. The realization of this technology mainly relies on the impactor to use high-pressure gas or liquid as power, and transmit the generated impact force to the rock through the drill bit, and crush the rock layer through the rotation of the drill bit, and then complete the entire drilling process through steps such as pushing, cleaning dust, and lifting the drill.

[0004] After careful research, the inventors made up for the disadvantages of the down-the-hole impactor and found that the linear rotary motor can be used as a substitute for the down-the-hole impactor. They also found that when the down-the-hole impactor is in use, it requires a down-the-hole drill cylinder or a hydraulic power system, which increases the complexity of the system during use. At the same time, it can only perform rock breaking work and cannot adjust the working mode according to changes in the formation, such as requiring rotary impact or rotary shear.

[0005] Therefore, the present application aims to reduce the complexity of the system during mining, while also being able to adjust different working forms according to changes in the strata. Summary of the invention

[0006] The main purpose of the present invention is to provide a method for reducing the complex structure of the system during mining, while also being able to adjust different working modes according to changes in the strata.

[0007] In order to achieve the above-mentioned purpose, the present invention proposes a linear rotary impact motor, comprising a casing, and also comprising a stator component installed on the inner wall of the casing, which includes a circumferentially arranged stator core, annular winding and permanent magnets; and a mover component arranged at the center of the stator component, which includes a motor shaft that moves in combination with the casing, a mover yoke fixed to the outside of the motor shaft and a mover iron pole installed on the outer wall of the mover yoke; wherein the permanent magnets distributed circumferentially on the motor shaft have the same magnetization direction, and the adjacent permanent magnets distributed axially on the motor shaft have opposite magnetization directions.

[0008] Furthermore, the permanent magnet is embedded on a side of the stator core facing the mover component.

[0009] Furthermore, the permanent magnet is U-shaped.

[0010] Furthermore, the mover iron poles are staggered along the outer circumference of the mover yoke.

[0011] Furthermore, the movable yoke and the movable iron pole are integrally formed.

[0012] Furthermore, a support ring is installed on the outer periphery of the stator component, and is fixed to the casing through the support ring.

[0013] Furthermore, the housing is provided with end covers at both ends along the axis direction of the motor shaft, and the end covers are provided with rotary motion bearings and linear motion bearings in sequence in the direction of the motor shaft.

[0014] Furthermore, the annular winding is wound in an alternating manner on a yoke of a stator core in the stator component.

[0015] The above technical solution has the following advantages:

[0016] The present invention adopts a DC rotating motor to replace the original down-the-hole impactor. The circumferentially arranged permanent magnets have the same magnetization direction, and the adjacent axially arranged permanent magnets have opposite magnetization directions, forming a magnetic field concentration structure, which increases the air gap magnetic flux amplitude, and further increases the motor impact force / torque density, thereby improving the impact capacity on hard rock, making the DC rotating motor suitable for rock crushing, without the need to adopt a hydraulic system, reducing the complex structure of the original down-the-hole impactor system, and at the same time controlling the annular winding to achieve independent control and stable operation of the motor's linear impact, rotation and rotational impact movements, so that corresponding adjustments can be made according to changes in the formation to meet the impact effects of hard rock and soft rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0018] Figure 1 This is the overall structure diagram of the linear rotary impact motor;

[0019] Figure 2 This is a structural diagram of the stator part of the linear rotary impact motor;

[0020] Figure 3 This is a structural diagram of the stator support ring of a linear rotary impact motor;

[0021] Figure 4 This is a structural diagram of the fixed support ring of the stator part of the linear rotary impact motor;

[0022] Figure 5This is the structure diagram of the linear rotary impact motor casing.

[0023] In the figure: 1. linear motion bearing; 2. rotary motion bearing; 3. gasket; 4. end cover; 5. annular bracket; 6. fixing bracket; 7. support ring; 8. annular winding; 9. permanent magnet; 10. casing screw; 11. gasket screw; 12. motor shaft; 13. mover yoke; 14. mover iron pole; 15. stator core; 16. casing; 17. limit ring; 18. permanent magnet magnetizing direction; 19. first outlet slot; 20. stator pole fixing bracket; 21. support ring yoke; 22. fixing slot; 23. second outlet slot; 24. observation window. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0025] In view of the characteristics of hard rock with strong compression and shear resistance and weak tensile resistance, linear or rotary impact rock breaking should be mainly used. For softer rock formations, rotary impact rock breaking should be used. At this time, the axial impact force should not be too large to achieve the best spiral drilling effect. This patent proposes the use of a new linear rotary impact motor to replace the down-the-hole impactor. The linear rotary impact motor and the drill bit can cooperate to achieve three independent working modes: linear impact rock breaking, rotary shear rock breaking and rotary impact rock breaking. The research of this project not only eliminates the cylinder or hydraulic power system of the down-the-hole drill, simplifies the system structure, reduces the size and weight of the equipment, and reduces the complexity of the existing drive system, but also can adjust the working mode according to the changes in the formation to obtain the best drilling performance, extend the service life of the drill bit, and improve the drilling efficiency of the down-the-hole drill. It will help to further promote the level of intelligence, digitization and automation of my country's equipment manufacturing, and is of great significance to the development of my country's coal resources.

[0026] like Figure 1 and Figure 2As shown, a linear rotary impact motor includes a housing 16, a stator component and a mover component. The stator component is installed on the inner wall of the housing 16, and includes a circumferentially arranged stator core 15, an annular winding 8 and a permanent magnet 9; the mover component is arranged at the center of the stator component, and includes a motor shaft 12 that moves in combination with the housing 16, a mover yoke 13 fixed to the outside of the motor shaft 12 and located at the center of the stator component, and a mover iron pole 14 installed on the outer wall of the mover yoke 13; wherein the permanent magnets 9 distributed circumferentially on the motor shaft 12 have the same magnetizing direction, and the adjacent permanent magnets 9 distributed axially on the motor shaft 12 have opposite magnetizing directions. The permanent magnet 9 can be made of neodymium iron boron material. The magnetization distribution of the permanent magnet 9 is that the circumferentially arranged permanent magnet 9 provides a continuous magnetic field, while the axially arranged permanent magnet 9 enhances the magnetic field strength in a specific direction, making more effective use of the magnetic field and improving the torque / thrust density of the motor. The permanent magnet 9 forms a magnetic concentrating structure, which not only increases the air gap magnetic density amplitude and the motor impact force / torque density, but also the permanent magnet 9 is a U-shaped structure, which avoids the problem of motor loss caused by the falling of the permanent magnet 9. Moreover, the magnetization direction is perpendicular to the direction of the armature winding magnetic field, which minimizes the irreversible demagnetization of the permanent magnet, and the linear rotary impact motor can be applied in the mining field. Under the action of the stator and the mover, the motor shaft 12 can perform a compound motion with the housing 16, and the compound motion includes the motor shaft 12 performing linear and rotational motion relative to the housing 16; Figure 2 The arrow indicating the permanent magnet magnetization direction 18 in FIG. 1 is the magnetization direction of the permanent magnet 9 of the present application.

[0027] like Figure 3 and Figure 4 As shown, specifically, the stator component is fixed to the housing 16 through a fixing bracket 6 and a support ring 7, a fixing groove 22 is installed on the outer periphery of the fixing bracket 6, the support ring 7 includes a support ring yoke 21, and evenly distributed stator pole fixing brackets 20 are provided on the inner wall of the support ring yoke 21. The fixing bracket 6 is limited by the fixing groove 22 and the stator pole fixing bracket 20, which limits the stator component to the support ring 7, thereby fixing the stator component to the housing 16, and the stator core 15 is arranged on the support ring 7 in an irregular manner; in addition, annular brackets 5 are provided at both ends of the inner wall of the housing 16, and the support ring 7 is limited to the middle section of the housing 16 by the annular brackets 5, thereby ensuring the fixing of the installation position of the stator component, wherein the limiting method is that the annular brackets 5 on both sides abut against the fixing brackets 6 on both sides of the support ring 7, and the position of the support ring 7 is limited in the housing 16, and a first outlet groove 19 is also opened on the side wall of the support ring 7, and the first outlet groove 19 facilitates the outlet of the stator winding.

[0028] As an implementation method in this embodiment, Figure 1As shown, the permanent magnet 9 is embedded in the side of the stator core 15 facing the mover. Preferably, the permanent magnet 9 is embedded in the middle of the stator core 15 to improve the structural strength of the permanent magnet 9 installation and avoid the problem of motor damage caused by the permanent magnet 9 falling off. The stator core 15 can guide the magnetic lines of force and increase the magnetic flux density, thereby increasing the magnetic flux in the air gap, which helps to improve the output and efficiency of the motor. The stator core 15 is embedded with the permanent magnet 9 to reduce the magnetic resistance, making it easier for the magnetic flux to pass through, thereby reducing energy loss.

[0029] As an implementation method in this embodiment, Figure 1 As shown, the rotor iron poles 14 are staggered along the outer periphery of the rotor yoke 13, so that the air gap magnetic field formed by the excitation winding is bipolar, which effectively improves the torque density and power density of the motor. The rotor yoke 13 and the rotor iron poles 14 can be formed by welding, and the rotor yoke 13 and the rotor iron poles 14 are preferably designed as an integral molding, which can greatly improve the structural strength of the installation of the rotor iron poles 14 and the rotor yoke 13, ensure the stability of the impact on the ore, and more effectively guide the magnetic flux, thereby increasing the magnetic flux in the air gap, which helps to improve the thrust density of the motor. A limit ring 17 for limiting the movement of the rotor yoke 13 is also provided on the outer wall of the motor shaft 12 to ensure that the position of the rotor yoke 13 is fixed.

[0030] As an implementation method in this embodiment, Figure 1 As shown, the housing 16 is provided with end covers 4 at both ends along the axis direction of the motor shaft 12, and the end covers 4 are provided with a rotary motion bearing 2 and a linear motion bearing 1 in sequence in the direction of the motor shaft 12, the linear motion bearing 1 is embedded in the rotary motion bearing 2, and is installed in the end covers 4 by means of a gasket screw 11 and a gasket 3, and the end covers 4 are fixed to the housing 16 by means of fasteners, such as by tightening the end covers 4 and the housing 16 by means of a housing screw 10. The permanent magnet 9 is a U-shaped structure, which improves the overall space utilization of the linear motion bearing 1.

[0031] As an implementation method in this embodiment, Figure 1 As shown, the annular winding 8 is staggeredly wound on the yoke of the stator core 15 in the stator component, that is, the support ring yoke 21 of the present application, which improves the utilization rate of the motor space and the slot fill rate; the stator slot is eliminated in the axial direction of the motor shaft 12, reducing the axial magnetic leakage of the motor shaft 12. Regardless of the motion state of the motor, the stator magnetic circuit is the same, reducing the difficulty of decoupling.

[0032] As an implementation method in this embodiment, Figure 5 As shown, an observation window 24 is provided on the outside of the casing 16, through which the specific conditions inside the linear rotary impact motor can be observed, which is convenient for studying the control strategy. A second wire outlet slot 23 is also provided on the outer wall of the casing 16 for facilitating wire outlet.

[0033] In this application, if Figure 1-Figure 3 As shown, the number of phases of the annular winding 8 can be set to 18, and it is wound on the supporting ring yoke 21. The 18-phase annular winding 8 can be divided into two groups of 9-phase motor control, and the two sets of windings are arranged in the form of (A, B, C, G, H, I, M, N, O) and (D, E, F, J, K, L, P, Q, R), as shown in detail. Figure 2 As shown, it is only necessary to control the current of a single set of annular windings 8 to realize the independent control and stable operation of the linear impact, rotation and rotation impact motion of the motor. The motor can be equivalent to the operation mode of six three-phase permanent magnet synchronous motors. When performing linear impact motion, the winding arrangement is (A, G, M)(B, H, N)(C, I, O)(D, J, P)(E, K, Q)(F, L, R); when performing rotation motion, the winding arrangement is (A, B, C)(G, H, I)(M, N, O)(D, E, F)(J, K, L)(P, Q, R); when performing rotation impact motion, the winding arrangement is (A, H, O)(B, I, M)(C, G, N)(D, K, R)(E, L, P)(F, J, Q). Taking the phase of phase A as a reference, by establishing the relationship between the initial phases of phase A and phase D in the circumferential and axial directions, the difficulty of control can be effectively reduced and the torque / thrust density can be improved.

[0034] like Figure 1 and Figure 2 As shown, the permanent magnet 9 is located in the stator part, and the magnetization direction of the permanent magnet 9 is perpendicular to the magnetic field direction of the armature winding, which reduces the risk of irreversible demagnetization of the permanent magnet 9. By controlling the 18-phase annular winding 8 of the linear rotation impact motor, the rotation, linear and spiral motion and stable operation of the motor are realized. The motor has a compact structure and high power density. The stator and rotor can be flexibly designed according to needs to expand the motor. If other pole slot combinations are used, the same is applicable. By designing different stator pole structures, rotor pole structures, winding arrangements and permanent magnet 9 arrangements, a variety of motor structures can be expanded based on this motor.

[0035] The structure of single stator, single mover and single winding reduces the number of parts to the greatest extent. The winding of the axially magnetized U-shaped NdFeB permanent magnet 9 is embedded in the stator core 15 and the mover iron pole 14, avoiding the problem of motor damage caused by the winding of the permanent magnet 9 falling off. The winding magnetization direction of the circumferentially arranged permanent magnet 9 is the same. The mover iron pole 14 is staggered along the axial direction, and the integrated design increases the strength of the mover. The magnetization direction of the permanent magnet 9 winding is perpendicular to the direction of the stator armature magnetic field, which maximizes the avoidance of irreversible demagnetization of the permanent magnet 9 winding. The 18-phase annular winding 8 is wound on the stator yoke and staggered to improve the utilization rate of the motor space and the slot fill rate. It only needs to control the current of a single set of annular windings 8 to achieve independent control and stable operation of the motor's linear impact, rotation and rotation impact motions.

[0036] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A linear rotary impact motor, comprising a housing (16), characterized in that: Also includes: A stator component, mounted on the inner wall of the housing (16), comprising a circumferentially arranged stator core (15), an annular winding (8) and a permanent magnet (9); and A mover component is arranged at the center of the stator component, and comprises a motor shaft (12) that moves in combination with the housing (16), a mover yoke (13) fixed to the outside of the motor shaft (12), and a mover iron pole (14) mounted on the outer wall of the mover yoke (13); The permanent magnets (9) distributed circumferentially on the motor shaft (12) have the same magnetization direction, and the adjacent permanent magnets (9) distributed axially on the motor shaft (12) have opposite magnetization directions.

2. The linear rotary impact motor according to claim 1, characterized in that: The permanent magnet (9) is embedded in the side of the stator core (15) facing the mover component.

3. The linear rotary impact motor according to claim 1 or 2, characterized in that: The permanent magnet (9) is U-shaped.

4. The linear rotary impact motor according to claim 1, characterized in that: The mover iron poles (14) are arranged in a staggered manner along the outer periphery of the mover yoke (13).

5. The linear rotary impact motor according to claim 1 or 4, characterized in that: The movable yoke (13) and the movable iron pole (14) are integrally formed.

6. The linear rotary impact motor according to claim 1, characterized in that: A support ring (7) is installed on the outer periphery of the stator component, and is fixed to the housing (16) via the support ring (7).

7. The linear rotary impact motor according to claim 1, characterized in that: The housing (16) is provided with end covers (4) at both ends along the axis direction of the motor shaft (12), and the end covers (4) are provided with rotary motion bearings (2) and linear motion bearings (1) in sequence in the direction of the motor shaft (12).

8. The linear rotary impact motor according to claim 1, characterized in that: The annular winding (8) is wound in an alternating manner on the yoke of the stator core (15) in the stator component.

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