Disc-type spindle motor

Abstract

The utility model discloses a disc-type spindle motor which comprises a machine tool spindle box, a disc-type motor is fixed on the outer wall of one side of the machine tool spindle box, a mechanical spindle is connected inside the machine tool spindle box through a bearing, the disc-type motor comprises a motor shell, a shaft sleeve is connected inside the motor shell through the mechanical spindle, and two filter shells are fixed on the outer wall of the top of the motor shell. An annular closed cavity is formed in the motor shell, and the two filter shells communicate with the annular closed cavity. The motor rotor is directly connected with the mechanical main shaft, the rigidity and concentricity of the main shaft are ensured, a special cooling structure is adopted, and the influence of a heat source on the precision of a machine tool is effectively reduced. And the high-power density design is adopted, the mechanical structure is simplified, and the product has the characteristics of high torque and light weight due to the motor with the same volume.

Description

Technical Field

[0001] The utility model relates to the technical field of numerically controlled machine tools, in particular to a disc-type spindle motor. Background Art

[0002] The spindle motor structure of a machine tool is the core part of the machine tool, and its performance directly affects the processing effect and efficiency of the product. The traditional machine tool spindle adopts an asynchronous motor plus a pulley to drive the mechanical spindle to rotate. This structure has several disadvantages: the spindle motor is driven by a pulley, and the pulley is tough, resulting in poor rigidity of the mechanical spindle and poor running accuracy; the pulley is driven, and the belt will wear and break after long-term operation, and it is easy to malfunction; the spindle motor and the mechanical spindle drive, in order to increase the torque, increase the transmission ratio, and high-speed operation cannot be achieved. If the spindle speed cannot be increased, the high finish of the surface of the processed product cannot be achieved; ordinary asynchronous motors all use air-cooled structures to dissipate heat. If there is a problem with the air-cooling fan and it cannot dissipate heat, the motor temperature will rise sharply, causing damage to the motor. Some manufacturers use built-in electric spindle solutions to solve the above problems.

[0003] However, the manufacturing of built-in electric spindles requires very high precision in parts processing. Ordinary machine tool factories do not have the manufacturing and processing capabilities, which leads to the high price of built-in electric spindles and makes them difficult to promote. The motor stator and rotor of the built-in electric spindle are built inside the mechanical spindle. When the electric spindle is running, the motor stator will generate heat. If the heat dissipation of the electric spindle is not good, the temperature inside the electric spindle will rise too high, resulting in mechanical deformation, and in severe cases, the machine will get stuck or the motor stator will be burned. Therefore, it is urgent to design a disc spindle motor to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a disk-type spindle motor to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A disc-type spindle motor comprises a machine tool spindle box, a disc-type motor is fixed to an outer wall of one side of the machine tool spindle box, a mechanical spindle is connected to the inside of the machine tool spindle box via a bearing, the disc-type motor comprises a motor shell, a shaft sleeve is connected to the inside of the motor shell via a mechanical spindle, two filter shells are fixed to the top outer wall of the motor shell, an annular closed cavity is arranged inside the motor shell, both of the two filter shells are communicated with the annular closed cavity, a retaining ring is arranged on the top of the filter shell, a threaded ring is integrally formed on the bottom outer wall of the retaining ring, the threaded ring is connected to the filter shell via threads, a metal mesh 1 and a metal mesh 2 are fixed to the bottom outer wall of the threaded ring, filter cotton is arranged between the metal mesh 1 and the metal mesh 2, magnetic particles are arranged inside the metal mesh 2, and a connecting pipe is fixed to the top outer wall of the retaining ring.

[0007] Furthermore, a rotor core is fixed to the outside of the shaft sleeve, a stator core is fixed to the inside of the motor housing, and the rotor core is located inside the stator core.

[0008] Furthermore, the annular closed cavity has an internal spacer ring, and a water outlet is provided at the bottom of the spacer ring. The water outlet is located on a side of the spacer ring away from the filter housing.

[0009] Furthermore, a sealing groove is formed on the top outer wall of the filter housing, a sealing ring is arranged inside the sealing groove, and the sealing ring is located at the bottom of the retaining ring.

[0010] Furthermore, one end of the shaft sleeve extends to the outside of the motor housing and is fixed with a baffle, a pressure plate is provided on one side of the baffle, a brake disc is provided between the baffle and the pressure plate, a locking bolt is inserted at the center of the pressure plate, and one end of the locking bolt is connected to the baffle through a thread.

[0011] Furthermore, a positioning column is integrally formed on one side outer wall of the baffle plate and the pressure plate, a positioning hole is opened on one side outer wall of the brake disc, and one end of the positioning column extends to the inside of the positioning hole.

[0012] In the above technical scheme, the disc-type spindle motor provided by the utility model has the following beneficial effects: by continuously passing water into the annular closed cavity of the motor housing, the water can quickly take away the heat inside the motor housing, thereby making the heat dissipation effect of the spindle motor better when in use, and the impurities in the water can be removed by the filter cotton, and the magnetic impurities are further removed by using the magnetic particles to achieve the effect of further purifying the water, preventing the impurities from adhering to the inner wall of the annular closed cavity, making it more reliable to pass water into the annular closed cavity of the motor housing to dissipate heat; the filter housing is threadedly connected to the filter housing by a threaded ring, so that the components inside the filter housing are easy to install and disassemble when they are replaced, and the filter housing and the retaining ring are sealed by a sealing ring, so that after the components inside the filter housing are replaced, there will be no water leakage between the housing and the retaining ring; the brake disc is positioned by a positioning column, so that the brake disc can be fixed by a locking bolt, thereby making the brake disc more convenient to install and disassemble.

[0013] (1) Compared with the original technology, this utility model adopts a high power density design and simplifies the mechanical structure. With the same volume of motor, this product has the characteristics of high torque and light weight. Not only is the cutting force large in the rated speed section, but the acceleration characteristics are especially good at the high speed end, which can greatly improve the structure production efficiency and expand the processing range of the machine tool. It effectively solves the problem of insufficient output of the original built-in electric spindle and traditional mechanical structure.

[0014] (2) The motor rotor of the utility model is directly connected to the mechanical spindle, ensuring the rigidity and concentricity of the spindle. As the core of the equipment, the spindle requires high rigidity and high stability, so there are requirements for the span between bearings. Since this product is installed outside the bearing spacing, it does not affect the high rigidity and stability of the mechanical spindle, and is convenient for realizing the optimized spindle span design, so that equipment manufacturers do not have to worry about the unreliability brought by the new structure.

[0015] (3) The utility model adopts a special cooling structure to effectively reduce the impact of heat sources on machine tool accuracy. The disc spindle motor has a built-in circulating liquid cooling structure, and the heat source is moved outside the mechanical spindle system, effectively reducing the impact of motor heat on the mechanical spindle bearings and extending the bearing life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A front structural schematic diagram of a disk-type spindle motor embodiment of the utility model.

[0018] Figure 2 A schematic diagram of the internal structure of a motor housing provided for an embodiment of a disc-type spindle motor of the utility model.

[0019] Figure 3 This is a schematic diagram of the enlarged structure of point A provided in an embodiment of the disk-type spindle motor of the utility model.

[0020] Figure 4 This is a schematic diagram of the enlarged structure of point B provided in an embodiment of the disk-type spindle motor of the utility model.

[0021] Figure 5 A schematic diagram of the annular closed cavity structure provided for an embodiment of the disk-type spindle motor of the utility model.

[0022] Description of reference numerals:

[0023] 1. Machine tool spindle box, 2. Motor housing, 3. Spacer ring, 4. Bushing, 5. Stator core, 6. Rotor core, 7. Water inlet, 8. Brake disc, 9. Filter housing, 10. Connecting pipe, 11. Retaining ring, 12. Threaded ring, 13. Metal mesh 1, 14. Filter cotton, 15. Metal mesh 2, 16. Sealing groove, 17. Sealing ring, 18. Magnetic particles, 19. Retaining disc, 20. Pressure disc, 21. Positioning hole, 22. Positioning column, 23. Locking bolt, 24. Annular closed cavity, 25. Mechanical spindle. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] like Figure 1-5 As shown, the disc spindle motor provided by the embodiment of the utility model comprises a machine tool spindle box 1, a disc motor is fixed on one side outer wall of the machine tool spindle box 1, a mechanical spindle 25 is connected to the inside of the machine tool spindle box 1 through a bearing, the disc motor comprises a motor shell 2, a shaft sleeve 4 is connected to the inside of the motor shell 2 through the mechanical spindle 25, two filter shells 9 are fixed to the top outer wall of the motor shell 2, an annular closed cavity 24 is arranged inside the motor shell 2, the two filter shells 9 are communicated with the annular closed cavity 24, a retaining ring 11 is arranged on the top of the filter shell 9, a threaded ring 12 is integrally formed on the bottom outer wall of the retaining ring 11, the threaded ring 12 is connected to the filter shell 9 through threads, a metal mesh 13 and a metal mesh 2 15 are fixed to the bottom outer wall of the threaded ring 12, a filter cotton 14 is arranged between the metal mesh 13 and the metal mesh 2 15, magnetic particles 18 are arranged inside the metal mesh 2 15, and a connecting pipe 10 is fixed to the top outer wall of the retaining ring 11.

[0026] Specifically, in this embodiment, a machine tool spindle box 1 is included, and the machine tool spindle box 1 is the outer shell of the spindle of the CNC machine tool in the prior art. A disc motor is fixed to the outer wall of one side of the machine tool spindle box 1. The inside of the machine tool spindle box 1 is connected to a mechanical spindle 25 through a bearing. When in use, the disc motor drives the mechanical spindle 25 to rotate. The disc motor includes a motor housing 2. The inside of the motor housing 2 is connected to a shaft sleeve 4 through the mechanical spindle 25. The shaft sleeve 4 is connected to the mechanical spindle 25 through a key. Two filter housings 9 are fixed to the top outer wall of the motor housing 2. An annular closed cavity 24 is arranged inside the motor housing 2. The outer wall of the motor housing 2 has a water inlet and a water outlet. The water inlet The holes and water outlet holes correspond to the two filter shells 9 respectively, so that the two filter shells 9 are connected with the annular closed cavity 24. Water is introduced into the interior of one of the filter shells 9, and the water can enter the annular closed cavity 24 and then flow out from the other filter shell 9, so that the water can achieve the effect of efficient heat dissipation inside the motor housing 2. The water introduced into the interior of the filter shell 9 is preferably pure water to prevent the formation of scale during use. The water flowing out of the annular closed cavity 24 can enter the annular closed cavity 24 again after cooling, so that the water can be recycled. A retaining ring 11 is provided on the top of the filter shell 9, and a threaded ring 12 is integrally formed on the bottom outer wall of the retaining ring 11. The threaded ring 12 is connected to the filter housing 9 by threads, and the retaining ring 11 has a flat surface for clamping with a wrench, so that the threaded ring 12 and the filter housing 9 can be easily disassembled. The bottom outer wall of the threaded ring 12 is fixed with a metal mesh 13 and a metal mesh 2 15, and a filter cotton 14 is arranged between the metal mesh 13 and the metal mesh 2 15. Since water needs to be transported by a pump and a pipeline when it is circulated, the water will carry impurities inside the pump and the pipeline into the filter housing 9. The impurities include magnetic impurities and non-magnetic impurities. The filter cotton 14 can filter impurities in the water. The metal mesh 2 15 is provided with magnetic particles 18, and the magnetic particles 18 can In order to further absorb the magnetic impurities in the water, the impurities are doubly filtered. A connecting pipe 10 is fixed to the top outer wall of the retaining ring 11, which is connected to the water inlet and outlet pipes through the connecting pipe 10. A sealing groove 16 is opened on the top outer wall of the filter housing 9. A sealing ring 17 is arranged inside the sealing groove 16. The sealing ring 17 is located at the bottom of the retaining ring 11 and is threadedly connected to the filter housing 9 through a threaded ring 12, so that the components inside the filter housing 9 are easy to install and disassemble when they are replaced. At the same time, the filter housing 9 and the retaining ring 11 are sealed by the sealing ring 17, so that after the components inside the filter housing 9 are replaced, there will be no water leakage between the housing and the retaining ring 11.

[0027] The disk-type spindle motor provided by the utility model continuously passes water into the annular closed cavity 24 of the motor housing 2 through the connecting pipe 10, so that the water can quickly take away the heat inside the motor housing 2, thereby making the heat dissipation effect of the spindle motor better when in use, and the impurities in the water can be removed by the filter cotton 14, and the magnetic impurities are further removed by the magnetic particles 18, so as to achieve the effect of further purifying the water, prevent impurities from adhering to the inner wall of the annular closed cavity 24, and make it more reliable to pass water into the annular closed cavity 24 of the motor housing 2 to dissipate heat.

[0028] In another embodiment provided by the present utility model, Figure 2As shown, a rotor core 6 is fixed to the outside of the sleeve 4, and a stator core 5 is fixed to the inside of the motor housing 2. The rotor core 6 is located inside the stator core 5. Both the rotor core 6 and the stator core 5 are prior arts, so that after the stator core 5 is energized, the rotor core 6 can drive the sleeve 4 to rotate, and then the sleeve 4 drives the rotating part of the mechanical spindle 25 to rotate. Because the mechanical thermal deformation of the mechanical spindle 25 will affect the quality and accuracy of the processed products, and will also cause mechanical spindle failure, the bearing of the original mechanical spindle 25 of the machine tool is used to support the sleeve 4 for rotation. The rotor core 6 and the stator core 5 have no direct contact, and the heat of the stator core 5 is not easily transferred to the rotor core 6, which will not cause thermal deformation of the mechanical spindle 25 of the machine tool. At present, there is a kind of spindle with built-in motor inside the machine tool spindle box 1 on the market. The motor of this spindle is very inconvenient to disassemble during maintenance. Compared with the spindle with built-in motor, the utility model makes the spindle motor more convenient to disassemble and repair, and directly connects the sleeve 4 with the mechanical spindle 25, so as to achieve the effect of good servo response, high rigidity, low vibration and low noise of the machine tool spindle. The motor shape proposed by the utility model is a disc-shaped permanent magnet synchronous motor. After it is installed with the machine tool spindle, a disc-type permanent magnet synchronous electric spindle structure is formed. The disc-type permanent magnet synchronous electric spindle structure overcomes the disadvantages of the built-in electric spindle and the traditional belt spindle structure, and has the following characteristics: 1. It does not change the size of the equipment, does not change the structure of the spindle box, and only uses the original installation position of the belt pulley. 2. It is easy to install, and the design can realize the integrated installation structure, which can be directly installed on the transition flange seat of the equipment spindle box, which is simple and convenient, and does not change the equipment installation size, nor the size and rigidity of the mechanical spindle box. 3. As the core of CNC machine tools, the spindle needs high rigidity and high stability, so there are requirements for the span between bearings. Since the spindle motor is placed outside the bearing spacing, it does not affect the high rigidity and stability of the mechanical spindle. 4. To realize the C-axis function, the spindle motor of the utility model adopts a direct connection method, which effectively avoids the transmission chain gap and toughness caused by the belt connection method, and realizes the C-axis function with high rigidity and high precision. 5. Higher power density and output torque effectively solve the problem of insufficient output of the original built-in electric spindle and traditional belt spindle structure. 6. The special cooling structure effectively reduces the influence of heat source on the accuracy of machine tools.The disk spindle motor has a built-in circulating liquid cooling structure, and the heat source is moved outward outside the machine tool spindle, which effectively reduces the impact of the motor heat on the mechanical spindle bearings and extends the bearing life; the annular closed cavity 24 has an inherent spacer ring 3 inside, and the spacer ring 3 divides the annular closed cavity 24 into two parts. The bottom of the spacer ring 3 is provided with a water outlet 7, and the water outlet 7 is located on the side of the spacer ring 3 away from the filter housing 9. The spacer ring 3 prevents water from entering the annular closed cavity 24 from the water inlet and will not immediately flow out from the water outlet, preventing the water at the bottom of the annular closed cavity 24 from flowing slowly, allowing water to flow through the water outlet 7 at the bottom, thereby achieving the effect of sufficient flow of water inside the annular closed cavity 24, making the heat dissipation of the motor housing 2 more uniform and efficient.

[0029] In another embodiment provided by the present utility model, Figure 2 and Figure 4 As shown, one end of the sleeve 4 extends to the outside of the motor housing 2 and is fixed with a baffle 19, a pressure plate 20 is arranged on one side of the baffle 19, and a brake disc 8 is arranged between the baffle 19 and the pressure plate 20. The brake disc 8 is the brake disc of the spindle motor, and the brake assembly of the brake 8 rubs against the brake disc 8, thereby realizing the braking of the mechanical spindle 25. At present, the brake disc 8 and the sleeve 4 are fixed in a manner of fixing the brake disc 8 by multiple bolts, and a locking bolt 23 is inserted at the center of the pressure plate 20, and one end of the locking bolt 23 is connected to the baffle 19 by a thread; the outer walls of one side of the baffle 19 and the pressure plate 20 are integrally formed with a positioning column 22, and a positioning hole 21 is opened on the outer wall of one side of the brake disc 8, and one end of the positioning column 22 extends to the inside of the positioning hole 21, and the positioning column 22 realizes the function of limiting the brake disc 8, and the brake disc 8 is positioned by the positioning column 22, so that the brake disc 8 can be fixed by a locking bolt 23, thereby making the brake disc 8 more convenient to install and disassemble.

[0030] Working principle: When in use, water is passed into the connecting pipe 10, so that the water enters the annular closed cavity 24 of the motor housing 2 from the filter housing 9, and then the water passes through the annular closed cavity 24 and flows out from another connecting pipe 10, so that the heat inside the motor housing 2 is efficiently dissipated; after the water enters the filter housing 9 from the connecting pipe 10, the water first contacts the magnetic particles 18 inside the metal mesh 15, so that the magnetic particles 18 can remove the magnetic impurities in the water, and then the water passes through the filter cotton 14 between the metal mesh 13 and the metal mesh 2 15, so that the filter cotton 14 filters the impurities in the water again; when all the components inside the filter housing 9 need to be replaced, the retaining ring 11 is rotated so that the threaded ring 12 is threadedly separated from the filter housing 9, and then all the components inside the filter housing 9 can be replaced.

[0031] The disc-type spindle motor of the utility model only uses the installation space of the original mechanical spindle belt pulley, does not change the size of the original equipment, does not change the structure of the original spindle box, and only uses the space position of the original installation belt pulley; it is easy to install, and is designed to realize an integrated installation structure. The stator part of the motor can be directly installed on the transition flange seat of the machine tool spindle box, and the rotor part is directly installed at the position of the original installation belt pulley at the rear end of the mechanical spindle rotor. The installation is simple and convenient, and neither the installation size of the original equipment nor the size and rigidity of the original mechanical spindle box are changed; the disc-type servo motor adopts a bearingless design, and the motor rotor is supported and rotated by the original mechanical spindle bearing of the machine tool. The motor rotor has no direct contact with the motor stator, and the stator heat cannot be transmitted to the motor rotor, which will not cause thermal deformation to the mechanical spindle of the machine tool. Mechanical thermal deformation will affect the quality and precision of processed products and may also cause mechanical spindle failure. This disc spindle motor adopts a circulating liquid cooling casing design. A heat dissipation liquid cooling channel is designed on the surface of the motor stator casing. During the operation of the motor, the heat generated by the stator can be dissipated through the circulating liquid in the heat dissipation liquid cooling channel, so that this product can run at high speed for a long time without damaging the motor body, and will not affect the thermal deformation of other mechanical structures due to motor heating.

[0032] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A disk-type spindle motor, characterized in that: The invention comprises a machine tool spindle box (1), a disk motor is fixed on one side outer wall of the machine tool spindle box (1), the interior of the machine tool spindle box (1) is connected to a mechanical spindle via a bearing, the disk motor comprises a motor housing (2), the interior of the motor housing (2) is connected to a shaft sleeve (4) via the mechanical spindle, two filter housings (9) are fixed on the top outer wall of the motor housing (2), an annular closed cavity (24) is provided inside the motor housing (2), the two filter housings (9) are both connected to the annular closed cavity (24), and the filter housing (9) A retaining ring (11) is arranged at the top of the filter housing (9), a threaded ring (12) is integrally formed on the bottom outer wall of the retaining ring (11), the threaded ring (12) is connected to the filter housing (9) by threads, a metal mesh 1 (13) and a metal mesh 2 (15) are fixed to the bottom outer wall of the threaded ring (12), a filter cotton (14) is arranged between the metal mesh 1 (13) and the metal mesh 2 (15), magnetic particles (18) are arranged inside the metal mesh 2 (15), and a connecting pipe (10) is fixed to the top outer wall of the retaining ring (11).

2. The disk-type spindle motor according to claim 1, characterized in that: A rotor core (6) is fixed to the outside of the shaft sleeve (4), a stator core (5) is fixed to the inside of the motor housing (2), and the rotor core (6) is located inside the stator core (5).

3. The disk-type spindle motor according to claim 1, characterized in that: The annular closed cavity (24) has a built-in spacer ring (3) inside, and a water outlet (7) is provided at the bottom of the spacer ring (3). The water outlet (7) is located on a side of the spacer ring (3) away from the filter housing (9).

4. The disk-type spindle motor according to claim 1, characterized in that: A sealing groove (16) is formed on the top outer wall of the filter housing (9), a sealing ring (17) is arranged inside the sealing groove (16), and the sealing ring (17) is located at the bottom of the retaining ring (11).

5. The disk-type spindle motor according to claim 1, characterized in that: One end of the shaft sleeve (4) extends to the outside of the motor housing (2) and is fixed with a baffle (19); a pressure plate (20) is arranged on one side of the baffle (19); a brake disc (8) is arranged between the baffle (19) and the pressure plate (20); a locking bolt (23) is inserted at the center of the pressure plate (20); one end of the locking bolt (23) is connected to the baffle (19) by a thread.

6. The disk-type spindle motor according to claim 5, characterized in that: A positioning column (22) is integrally formed on one side outer wall of the baffle plate (19) and the pressure plate (20), a positioning hole (21) is opened on one side outer wall of the brake plate (8), and one end of the positioning column (22) extends into the interior of the positioning hole (21).

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