A waterproof permanent magnet synchronous motor for a chamfering machine

Abstract

The present invention provides a waterproof permanent magnet synchronous motor for a chamfering machine, belonging to the technical field of permanent magnet synchronous motors, which includes a waterproof cover, a steel seal, and a rotating member coaxially installed on a rotating shaft and arranged in sequence along the axial direction of the rotating shaft; a multi-stage drainage structure is formed between the steel seal and the front end cover. For this waterproof permanent magnet synchronous motor for a chamfering machine, the waterproof cover cooperates with the check valve platform and the blocking eaves to form a primary waterproof area at the end of the machine base. On the one hand, a large amount of coolant is discharged, and on the other hand, the discharged coolant is effectively prevented from flowing back. Combining with the negative pressure area formed by the rotation of the rotating member to constitute a secondary waterproof area, which blocks the coolant from entering the interior of the motor, significantly improving the waterproof performance of the motor, effectively preventing the coolant from entering the interior of the motor, and improving the safety and service life of the motor. Secondly, the multi-stage drainage structure combines with the negative pressure area formed by the rotating member to discharge the coolant that enters the steel seal, further improving the waterproof ability of the motor and the stability of long-term operation.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet synchronous motors, and particularly to a waterproof permanent magnet synchronous motor for a chamfering machine. Background Art

[0002] The permanent magnet synchronous motor used for chamfering machine tools (hereinafter referred to as the motor) is a device specifically used for chamfering, deburring or machining specific angles on the edges of workpieces such as metals and plastics. It has the advantages of high efficiency, high precision, safety and reliability, and is widely used in the fields of mechanical manufacturing, automobiles, aerospace, etc.

[0003] During the chamfering process, the motor needs to run for a long time in a coolant environment. Existing technologies mostly use sealing rings for sealing, and their waterproof performance is difficult to fully meet the requirements for the long-term stable operation of the motor. On the one hand, the sealing ring is prone to aging at high temperatures, resulting in sealing failure, and the coolant will enter the motor. On the other hand, there is a lack of a drainage mechanism. Once the coolant enters the motor, it cannot be discharged, which will directly affect the safety of the motor operation and reduce the service life of the motor. Summary of the Invention

[0004] The present invention provides a waterproof permanent magnet synchronous motor for a chamfering machine to solve the problems of low waterproof ability and lack of an effective drainage mechanism in the related technologies.

[0005] The present invention provides a waterproof permanent magnet synchronous motor for a chamfering machine, which includes a rotating shaft, a front end cover, a machine base, and a waterproof cover, a steel seal, and a rotating member coaxially installed on the rotating shaft and sequentially arranged along the axial direction of the rotating shaft; the steel seal is located between the waterproof cover and the front end cover, and a radial limiting structure is provided between the steel seal and the waterproof cover; a multi-stage drainage structure is formed between the steel seal and the front end cover, including: a plurality of annular bosses I coaxially arranged on the steel seal, and an adsorbent is provided at one end of the outer wall close to the steel seal; a plurality of annular bosses II coaxially arranged on the front end cover, and the annular bosses II and the annular bosses I are alternately arranged to form a labyrinth gap, and a plurality of drainage channels are provided on the annular bosses II; a drainage hole communicating with the labyrinth gap is provided on the front end cover, and the rotating member is located inside the front end cover and forms a negative pressure area with the rotation of the rotating shaft to prevent moisture from entering the machine base, and at the same time, the moisture is discharged through the drainage hole; a check platform is provided on the outer side of the front end cover, a drainage port is opened on the check platform, the waterproof cover extends backward through the check platform and forms a blocking eaves to cover the drainage port.

[0006] In a possible implementation manner, the rotating member includes an annular seat and streamlined protrusions, and the number of protrusions is several and evenly distributed on the front end face of the annular seat along the circumferential direction of the rotating shaft.

[0007] In a possible implementation manner, the radial limiting structure includes a radial limiting portion provided on the waterproof cover and a limiting groove formed on the steel seal, and the radial limiting portion is embedded in the limiting groove.

[0008] In a possible implementation manner, both the limiting groove and the radial limiting portion are annular structures and are coaxially arranged with the rotating shaft.

[0009] In a possible implementation manner, diversion lines are provided on both the waterproof cover and the first annular boss.

[0010] In a possible implementation manner, the number of drainage channels on the second annular boss is several and they are evenly distributed along the circumferential direction of the rotating shaft on the second annular boss.

[0011] In a possible implementation manner, the drainage channels on the second annular boss distributed from the inside out are arranged in sequence from the rear to the front in the axial direction of the rotating shaft, wherein the drainage channels are inclined outward from the front to the rear along the axial direction of the rotating shaft.

[0012] One or more of the above technical solutions in the embodiments of the present invention have at least the following technical effects: The waterproof permanent magnet synchronous motor for a chamfering machine provided by the embodiments of the present invention forms a primary waterproof area at the end of the machine base by the cooperation of the waterproof cover with the check platform and the blocking eaves. On the one hand, a large amount of coolant is discharged, and on the other hand, the discharged coolant is effectively prevented from flowing back. Combined with the negative pressure area formed by the rotation of the rotating part to constitute a secondary waterproof area, it blocks the coolant from entering the motor interior, significantly improving the waterproof performance of the motor, effectively avoiding the coolant from entering the motor interior, and improving the safety and service life of the motor. Secondly, the multi-stage drainage structure combined with the negative pressure area formed by the rotating part discharges the coolant entering the steel seal, further improving the waterproof ability of the motor and the stability of long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a partial cross-sectional structural schematic diagram of a waterproof permanent magnet synchronous motor for a chamfering machine provided by an embodiment of the present invention.

[0014] Figure 2 is Figure 1 the enlarged view of part A in

[0015] Figure 3 is Figure 1 the enlarged view of part B in

[0016] Figure 4 is a structural schematic diagram of the waterproof cover of a waterproof permanent magnet synchronous motor for a chamfering machine provided by an embodiment of the present invention.

[0017] Figure 5 is a structural schematic diagram of the steel seal of a waterproof permanent magnet synchronous motor for a chamfering machine provided by an embodiment of the present invention.

[0018] In the figure: 1, rotating shaft; 2, front end cover; 3, machine base; 4, waterproof cover; 5, steel seal; 6, rotating part; 61, annular seat; 62, protrusion; 7, radial limit structure; 71, radial limit part; 72, limit groove; 8, multi-stage drainage structure; 81, first annular boss; 82, adsorbing part; 83, second annular boss; 84, drainage channel; 85, drainage hole; 9, check platform; 10, drainage port; 11, blocking eaves; 12, diversion line; 13, bearing. Specific embodiments

[0019] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0020] Please refer to Figure 1 and Figure 4 , a waterproof permanent magnet synchronous motor for a chamfering machine, comprising a rotating shaft 1, a front end cover 2 and a machine base 3. The front end cover 2 is fixedly installed at the front end of the machine base 3. The rotating shaft 1 penetrates through the front end cover 2 from front to back and is rotatably installed on the machine base 3 through a bearing 13. The rotating shaft 1 is in clearance fit with the front end cover 2. A waterproof cover 4, a steel seal 5 and a rotating part 6 are coaxially installed on the rotating shaft 1. The waterproof cover 4, the steel seal 5 and the rotating part 6 are all in interference fit with the rotating shaft 1 and are distributed in sequence from front to back in the axial direction of the rotating shaft 1. A diversion line 12 is arranged on the waterproof cover 4. During the chamfering process, the waterproof cover 4 rotates with the rotating shaft 1, and the coolant is thrown outwards through the diversion line 12, effectively preventing the coolant from entering the motor.

[0021] Refer to Figure 1 and Figure 3, a check valve platform 9 is provided on the outer side of the front end cover 2. The check valve platform 9 is of an annular structure and is coaxially arranged with the rotating shaft 1. A drain port 10 is opened on the check valve platform 9, and the drain ports 10 are evenly distributed along the circumferential direction of the check valve platform 9. The rearward extension of the waterproof cover 4 passes through the check valve platform 9 and forms a blocking eaves 11 covering the drain port 10. The blocking eaves 11 is of an annular structure and is located at the rear side of the drain port 10 and is distributed at an interval with the drain port 10. The blocking eaves 11 and the check valve platform 9 cooperate to combine the drainage work of the waterproof cover 4, forming a primary waterproof area at the front end of the machine base 3. On the one hand, a large amount of coolant is discharged, on the other hand, the discharged coolant is prevented from flowing back, and at the same time, the accidental detachment of the waterproof cover 4 is avoided, significantly improving the sealing performance and safety of the motor. Among them, the moisture inside the waterproof cover 4 can be discharged through the drain port 10. The waterproof cover 4 is made of a non-metallic material with a low coefficient of thermal expansion (such as carbon fiber), and the blocking eaves 11 has a certain elastic deformation ability.

[0022] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 , a multi-stage drainage structure 8 is formed between the steel seal 5 and the front end cover 2. The multi-stage drainage structure 8 includes two annular bosses one 81 coaxially arranged on one side of the steel seal 5 facing the front end cover 2 and two annular bosses two 83 coaxially arranged on the front end cover 2. The annular boss two 83 and the annular boss one 81 are both coaxially arranged with the rotating shaft 1, and the annular boss two 83 and the annular boss one 81 are alternately arranged to form a labyrinth gap. As Figure 2 shown, the annular boss one 81 and the annular boss two 83 are alternately arranged in sequence from the inside to the outside along the radial direction of the rotating shaft 1. A plurality of drainage channels 84 are provided on the annular boss two 83, and the drainage channels 84 are evenly distributed along the circumferential direction of the annular boss two 83. During the cutting process, a large amount of coolant is drained away by the waterproof cover 4, and a small amount of coolant may enter the steel seal 5 through the sealing connection between the steel seal 5 and the waterproof cover 4 during the continuous working process. The steel seal 5 rotates with the rotating shaft 1, so that the coolant entering the steel seal 5 is discharged through the drainage channels 84 by the labyrinth gap, further preventing the coolant from entering the motor interior.

[0023] Refer to Figure 1 and Figure 2, the rotating part 6 is located inside the front end cover 2. A drain hole 85 communicating with the labyrinth gap is provided on the front end cover 2. The rotating part 6 is located at the rear side of the drain hole 85. The rotating part 6 includes an annular seat 61 fixed on the rotating shaft 1 and streamlined protrusions 62. The number of the protrusions 62 is several and they are evenly distributed on the front end face of the annular seat 61 along the circumferential direction of the rotating shaft 1. And the gap between the protrusions 62 and the front end cover 2 is 0.1 mm. When the rotating part 6 rotates with the rotating shaft 1, a local negative pressure is generated by the Bernoulli principle to form a secondary waterproof area, preventing the coolant from flowing backward through the bearing 13 into the motor interior and making it discharged forward through the drain hole 85 (because the amount of water that can reach this place will be very small due to the aforementioned waterproofing and drainage, so this method can effectively discharge the water), increasing the sealing performance of the motor and improving the safety of the motor.

[0024] Refer to Figure 1 , a radial limiting structure 7 is provided between the steel seal 5 and the waterproof cover 4. The radial limiting structure 7 includes a radial limiting part 71 provided on the waterproof cover 4 and a limiting groove 72 opened on the steel seal 5. Both the limiting groove 72 and the radial limiting part 71 are annular structures and are coaxially arranged with the rotating shaft 1. The radial limiting part 71 is embedded in the limiting groove 72. Through the cooperation of the radial limiting part 71 and the limiting groove 72, the waterproof cover 4 is limited in the radial direction, improving the stability of the position state of the waterproof cover 4, and effectively preventing the situation that the interference fit between the waterproof cover 4 and the rotating shaft 1 is reduced due to temperature rise, resulting in the coolant entering the motor interior from this place and affecting the operating stability of the motor, further improving the sealing performance and safety of the motor.

[0025] Refer to Figure 1 , Figure 2 and Figure 5 , an adsorbent 82 is provided at one end of the outer wall of the first annular boss 81 close to the steel seal 5. The adsorbent 82 is a material with strong adsorption (such as sponge). Flow guiding lines 12 are provided on the outer ring surfaces of both first annular bosses 81. During the drainage process, the adsorbent 82 can effectively absorb the coolant and cooperate with the flow guiding lines 12 on the steel seal 5 to discharge the water through the drainage channel 84.

[0026] Refer to Figure 2 , the drainage channels 84 on the second annular boss 83 distributed from the inside to the outside are sequentially distributed from the rear to the front in the axial direction of the rotating shaft 1, forming a stepped drainage path. The drainage channels 84 are inclined outward from the front to the rear along the axial direction of the rotating shaft 1, facilitating the rapid discharge of the coolant under the action of centrifugal force.

[0027] In the embodiments of the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of the present invention, it should also be noted that, unless otherwise clearly specified or limited, the terms "arranged", "connected", "installed" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, an integral connection or a sliding connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A waterproof permanent magnet synchronous motor for a chamfering machine, comprising a rotating shaft, a front end cover and a machine base, characterized in that: It further includes a waterproof cover, a steel seal, and a rotating member that are coaxially installed on the rotating shaft and arranged in sequence along the axial direction of the rotating shaft; The steel seal is located between the waterproof cover and the front end cover, and a radial limiting structure is provided between the steel seal and the waterproof cover; A check platform is provided on the outer side of the front end cover, a drain port is opened on the check platform, the waterproof cover extends backward past the check platform and forms a blocking eaves, and the blocking eaves cover the drain port from the rear side; The cooperation between the blocking eaves and the check platform combines with the drainage work of the waterproof cover to form a primary waterproof area at the front end of the machine base; A multi-stage drainage structure is formed between the steel seal and the front end cover, including: Several first annular protrusions coaxially arranged on the steel seal, and an adsorbent is provided at one end of the outer wall close to the steel seal; Several second annular protrusions coaxially arranged on the front end cover, the second annular protrusions and the first annular protrusions are alternately arranged to form a labyrinth gap, and several drainage channels are provided on the second annular protrusions; A drain hole communicating with the labyrinth gap is provided on the front end cover, the rotating member is located inside the front end cover and forms a negative pressure area with the rotation of the rotating shaft to prevent moisture from entering the machine base, and at the same time discharges the moisture through the drain hole.

2. The waterproof permanent magnet synchronous motor for a chamfering machine according to claim 1, wherein: The rotating member includes an annular seat and streamlined protrusions, and the number of protrusions is several and they are evenly distributed on the front end face of the annular seat along the circumferential direction of the rotating shaft.

3. The waterproof permanent magnet synchronous motor for a chamfering machine according to claim 1, characterized in that: The radial limiting structure includes a radial limiting portion provided on the waterproof cover and a limiting groove opened on the steel seal, and the radial limiting portion is embedded in the limiting groove.

4. A waterproof permanent magnet synchronous motor for a chamfering machine according to claim 3, characterized in that: Both the limiting groove and the radial limiting portion are annular structures and are coaxially arranged with the rotating shaft.

5. The waterproof permanent magnet synchronous motor for a chamfering machine according to claim 1, characterized in that: Guide lines are provided on both the waterproof cover and the first annular protrusion.

6. A waterproof permanent magnet synchronous motor for a chamfering machine according to claim 1, characterized in that: The number of drainage channels on the second annular protrusion is several and they are evenly distributed on the second annular protrusion along the circumferential direction of the rotating shaft.

7. A waterproof permanent magnet synchronous motor for a chamfering machine according to claim 1, characterized in that: The drainage channels on the second annular protrusion distributed from the inside to the outside are distributed in sequence from the rear to the front in the axial direction of the rotating shaft.

8. A waterproof permanent magnet synchronous motor for a chamfering machine according to any one of claims 1, 6, and 7, characterized in that: The drainage channels are inclined outward from the front to the rear along the axial direction of the rotating shaft.

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